diff --git a/attribute/attribute.mbt b/attribute/attribute.mbt
index 228cdab1..766905a0 100644
--- a/attribute/attribute.mbt
+++ b/attribute/attribute.mbt
@@ -55,10 +55,10 @@ pub fn Attribute::new(
 ) -> Attribute {
   //TODO: report better syntax error for attribute 
   let (id, dot_id, raw_payload) = content
-  let raw_payload = raw_payload.trim(char_set=" ").to_string()
   let (raw, attr_id) = match dot_id {
     None => ("#\{id}\{raw_payload}", { qual: None, name: id })
-    Some(dot_id) => ("#\{id}.\{dot_id}", { qual: Some(id), name: dot_id })
+    Some(dot_id) =>
+      ("#\{id}.\{dot_id}\{raw_payload}", { qual: Some(id), name: dot_id })
   }
   let { errors, docstrings: _, tokens } = @lexer.tokens_from_string(
     raw_payload,
diff --git a/attribute/attribute_test.mbt b/attribute/attribute_test.mbt
index f672111d..0a8c7087 100644
--- a/attribute/attribute_test.mbt
+++ b/attribute/attribute_test.mbt
@@ -10,7 +10,7 @@ test "attribute" {
   inspect(
     attr,
     content=(
-      #|{loc: -0:1-0:1, raw: "#qual.name", parsed: Some(Apply(qual.name, @list.from_array([Expr(Ident(a)), Expr(Ident(b)), Expr(Ident(c))])))}
+      #|{loc: -0:1-0:1, raw: "#qual.name(a,b,c)", parsed: Some(Apply(qual.name, @list.from_array([Expr(Ident(a)), Expr(Ident(b)), Expr(Ident(c))])))}
     ),
   )
   let attr = Attribute::new(
@@ -20,7 +20,7 @@ test "attribute" {
   inspect(
     attr,
     content=(
-      #|{loc: -0:1-0:1, raw: "#qual.name", parsed: Some(Apply(qual.name, @list.from_array([Labeled("label1", Ident(abc)), Labeled("label2", Ident(cde))])))}
+      #|{loc: -0:1-0:1, raw: "#qual.name(label1=abc, label2=cde)", parsed: Some(Apply(qual.name, @list.from_array([Labeled("label1", Ident(abc)), Labeled("label2", Ident(cde))])))}
     ),
   )
   let attr = Attribute::new(
@@ -30,7 +30,7 @@ test "attribute" {
   inspect(
     attr,
     content=(
-      #|{loc: -0:1-0:1, raw: "#qual.name", parsed: Some(Apply(qual.name, @list.from_array([Expr(Apply(f, @list.from_array([Expr(Bool(false))]))), Expr(Apply(g, @list.from_array([Expr(Bool(true))])))])))}
+      #|{loc: -0:1-0:1, raw: "#qual.name(f(false), g(true))", parsed: Some(Apply(qual.name, @list.from_array([Expr(Apply(f, @list.from_array([Expr(Bool(false))]))), Expr(Apply(g, @list.from_array([Expr(Bool(true))])))])))}
     ),
   )
   let attr = Attribute::new(
@@ -40,7 +40,7 @@ test "attribute" {
   inspect(
     attr,
     content=(
-      #|{loc: -0:1-0:1, raw: "#qual.name", parsed: Some(Apply(qual.name, @list.from_array([Expr(String("abcdef")), Expr(Apply(g, @list.from_array([Expr(Bool(true))])))])))}
+      #|{loc: -0:1-0:1, raw: "#qual.name(\"abcdef\", g(true))", parsed: Some(Apply(qual.name, @list.from_array([Expr(String("abcdef")), Expr(Apply(g, @list.from_array([Expr(Bool(true))])))])))}
     ),
   )
   let attr = Attribute::new(loc=dummy_loc, ("qual", Some("name"), ""))
diff --git a/attribute/parser.mbt b/attribute/parser.mbt
index 4a62fbe5..e86ec17f 100644
--- a/attribute/parser.mbt
+++ b/attribute/parser.mbt
@@ -190,11 +190,13 @@ priv enum YYSymbol {
   T_ENUMVIEW
   T_DECLARE
   T_NORAISE
+  T_NOBREAK
   T_WHERE
   T_TRY_QUESTION
   T_TRY_EXCLAMATION
   T_LEXMATCH
   T_LEXMATCH_QUESTION
+  T_PACKAGE
   NT_payloads
   NT_property
   NT_expr
@@ -214,7 +216,7 @@ fn init {
 }
 
 // file:///./parser.mbty
-// 150|    EOF { @list.empty() }
+// 153|    EOF { @list.empty() }
 
 ///|
 fn yy_action_0(
@@ -230,7 +232,7 @@ fn yy_action_0(
 }
 
 // file:///./parser.mbty
-// 151|    properties { $1 }
+// 154|    properties { $1 }
 
 ///|
 fn yy_action_1(
@@ -247,7 +249,7 @@ fn yy_action_1(
 }
 
 // file:///./parser.mbty
-// 167|    "(" ")"                      { @list.empty() }
+// 170|    "(" ")"                      { @list.empty() }
 
 ///|
 fn yy_action_2(
@@ -263,7 +265,7 @@ fn yy_action_2(
 }
 
 // file:///./parser.mbty
-// 168|    "(" non_empty_properties ")" { $2 }
+// 171|    "(" non_empty_properties ")" { $2 }
 
 ///|
 fn yy_action_3(
@@ -280,7 +282,7 @@ fn yy_action_3(
 }
 
 // file:///./parser.mbty
-// 154|    name=LIDENT "=" expr   { Labeled(name, $3) }
+// 157|    name=LIDENT "=" expr   { Labeled(name, $3) }
 
 ///|
 fn yy_action_4(
@@ -298,7 +300,7 @@ fn yy_action_4(
 }
 
 // file:///./parser.mbty
-// 161|    qual=LIDENT name=DOT_LIDENT props=properties { Apply({qual: Some(qual), name}, props) }
+// 164|    qual=LIDENT name=DOT_LIDENT props=properties { Apply({qual: Some(qual), name}, props) }
 
 ///|
 fn yy_action_5(
@@ -317,7 +319,7 @@ fn yy_action_5(
 }
 
 // file:///./parser.mbty
-// 159|    qual=LIDENT name=DOT_LIDENT                  { Ident({qual: Some(qual), name}) }
+// 162|    qual=LIDENT name=DOT_LIDENT                  { Ident({qual: Some(qual), name}) }
 
 ///|
 fn yy_action_6(
@@ -335,7 +337,7 @@ fn yy_action_6(
 }
 
 // file:///./parser.mbty
-// 160|    name=LIDENT props=properties                 { Apply({qual: None, name}, props) }
+// 163|    name=LIDENT props=properties                 { Apply({qual: None, name}, props) }
 
 ///|
 fn yy_action_7(
@@ -353,7 +355,7 @@ fn yy_action_7(
 }
 
 // file:///./parser.mbty
-// 158|    name=LIDENT                                  { Ident({qual: None, name}) }
+// 161|    name=LIDENT                                  { Ident({qual: None, name}) }
 
 ///|
 fn yy_action_8(
@@ -370,7 +372,7 @@ fn yy_action_8(
 }
 
 // file:///./parser.mbty
-// 155|    expr                   { Expr($1) }
+// 158|    expr                   { Expr($1) }
 
 ///|
 fn yy_action_9(
@@ -387,7 +389,7 @@ fn yy_action_9(
 }
 
 // file:///./parser.mbty
-// 162|    STRING                                       { String($1) }
+// 165|    STRING                                       { String($1) }
 
 ///|
 fn yy_action_10(
@@ -404,7 +406,7 @@ fn yy_action_10(
 }
 
 // file:///./parser.mbty
-// 163|    TRUE                                         { Bool(true) }
+// 166|    TRUE                                         { Bool(true) }
 
 ///|
 fn yy_action_11(
@@ -420,7 +422,7 @@ fn yy_action_11(
 }
 
 // file:///./parser.mbty
-// 164|    FALSE                                        { Bool(false) }
+// 167|    FALSE                                        { Bool(false) }
 
 ///|
 fn yy_action_12(
@@ -436,7 +438,7 @@ fn yy_action_12(
 }
 
 // file:///./parser.mbty
-// 172|    x=property "," xs=non_empty_properties{ xs.add(x) }
+// 175|    x=property "," xs=non_empty_properties{ xs.add(x) }
 
 ///|
 fn yy_action_13(
@@ -454,7 +456,7 @@ fn yy_action_13(
 }
 
 // file:///./parser.mbty
-// 171|    property { @list.from_array([$1]) }
+// 174|    property { @list.from_array([$1]) }
 
 ///|
 fn yy_action_14(
@@ -585,11 +587,13 @@ fn yy_input(
     ENUMVIEW => (T_ENUMVIEW, YYObj_Void)
     DECLARE => (T_DECLARE, YYObj_Void)
     NORAISE => (T_NORAISE, YYObj_Void)
+    NOBREAK => (T_NOBREAK, YYObj_Void)
     WHERE => (T_WHERE, YYObj_Void)
     TRY_QUESTION => (T_TRY_QUESTION, YYObj_Void)
     TRY_EXCLAMATION => (T_TRY_EXCLAMATION, YYObj_Void)
     LEXMATCH => (T_LEXMATCH, YYObj_Void)
     LEXMATCH_QUESTION => (T_LEXMATCH_QUESTION, YYObj_Void)
+    PACKAGE => (T_PACKAGE, YYObj_Void)
   }
 }
 
@@ -1083,11 +1087,13 @@ fn error(
         (T_ENUMVIEW, TK_ENUMVIEW),
         (T_DECLARE, TK_DECLARE),
         (T_NORAISE, TK_NORAISE),
+        (T_NOBREAK, TK_NOBREAK),
         (T_WHERE, TK_WHERE),
         (T_TRY_QUESTION, TK_TRY_QUESTION),
         (T_TRY_EXCLAMATION, TK_TRY_EXCLAMATION),
         (T_LEXMATCH, TK_LEXMATCH),
         (T_LEXMATCH_QUESTION, TK_LEXMATCH_QUESTION),
+        (T_PACKAGE, TK_PACKAGE),
       ] : Array[(YYSymbol, TokenKind)]) {
     try_add(term.0, term.1)
   }
diff --git a/attribute/parser.mbt.map.json b/attribute/parser.mbt.map.json
index 687b1adb..7a2682d0 100644
--- a/attribute/parser.mbt.map.json
+++ b/attribute/parser.mbt.map.json
@@ -2,128 +2,128 @@
   "mappings": [
     {
       "source": "parser.mbty",
-      "original_offset": 3113,
-      "generated_offset": 2923,
+      "original_offset": 3180,
+      "generated_offset": 2947,
       "length": 15
     },
     {
       "source": "parser.mbty",
-      "original_offset": 3146,
-      "generated_offset": 3167,
+      "original_offset": 3213,
+      "generated_offset": 3191,
       "length": 1
     },
     {
       "source": "parser.mbty",
-      "original_offset": 3149,
-      "generated_offset": 3176,
+      "original_offset": 3216,
+      "generated_offset": 3200,
       "length": 1
     },
     {
       "source": "parser.mbty",
-      "original_offset": 3871,
-      "generated_offset": 3386,
+      "original_offset": 3938,
+      "generated_offset": 3410,
       "length": 15
     },
     {
       "source": "parser.mbty",
-      "original_offset": 3922,
-      "generated_offset": 3648,
+      "original_offset": 3989,
+      "generated_offset": 3672,
       "length": 1
     },
     {
       "source": "parser.mbty",
-      "original_offset": 3925,
-      "generated_offset": 3657,
+      "original_offset": 3992,
+      "generated_offset": 3681,
       "length": 1
     },
     {
       "source": "parser.mbty",
-      "original_offset": 3199,
-      "generated_offset": 3943,
+      "original_offset": 3266,
+      "generated_offset": 3967,
       "length": 15
     },
     {
       "source": "parser.mbty",
-      "original_offset": 3216,
-      "generated_offset": 3966,
+      "original_offset": 3283,
+      "generated_offset": 3990,
       "length": 2
     },
     {
       "source": "parser.mbty",
-      "original_offset": 3575,
-      "generated_offset": 4340,
+      "original_offset": 3642,
+      "generated_offset": 4364,
       "length": 40
     },
     {
       "source": "parser.mbty",
-      "original_offset": 3404,
-      "generated_offset": 4699,
+      "original_offset": 3471,
+      "generated_offset": 4723,
       "length": 33
     },
     {
       "source": "parser.mbty",
-      "original_offset": 3489,
-      "generated_offset": 5057,
+      "original_offset": 3556,
+      "generated_offset": 5081,
       "length": 34
     },
     {
       "source": "parser.mbty",
-      "original_offset": 3325,
-      "generated_offset": 5363,
+      "original_offset": 3392,
+      "generated_offset": 5387,
       "length": 27
     },
     {
       "source": "parser.mbty",
-      "original_offset": 3248,
-      "generated_offset": 5625,
+      "original_offset": 3315,
+      "generated_offset": 5649,
       "length": 6
     },
     {
       "source": "parser.mbty",
-      "original_offset": 3256,
-      "generated_offset": 5639,
+      "original_offset": 3323,
+      "generated_offset": 5663,
       "length": 2
     },
     {
       "source": "parser.mbty",
-      "original_offset": 3667,
-      "generated_offset": 5910,
+      "original_offset": 3734,
+      "generated_offset": 5934,
       "length": 8
     },
     {
       "source": "parser.mbty",
-      "original_offset": 3677,
-      "generated_offset": 5926,
+      "original_offset": 3744,
+      "generated_offset": 5950,
       "length": 2
     },
     {
       "source": "parser.mbty",
-      "original_offset": 3731,
-      "generated_offset": 6145,
+      "original_offset": 3798,
+      "generated_offset": 6169,
       "length": 12
     },
     {
       "source": "parser.mbty",
-      "original_offset": 3795,
-      "generated_offset": 6375,
+      "original_offset": 3862,
+      "generated_offset": 6399,
       "length": 13
     },
     {
       "source": "parser.mbty",
-      "original_offset": 4048,
-      "generated_offset": 6682,
+      "original_offset": 4115,
+      "generated_offset": 6706,
       "length": 11
     },
     {
       "source": "parser.mbty",
-      "original_offset": 3979,
-      "generated_offset": 6935,
+      "original_offset": 4046,
+      "generated_offset": 6959,
       "length": 19
     },
     {
       "source": "parser.mbty",
-      "original_offset": 4000,
-      "generated_offset": 6962,
+      "original_offset": 4067,
+      "generated_offset": 6986,
       "length": 3
     }
   ]
diff --git a/attribute/parser.mbty b/attribute/parser.mbty
index 720e026d..230e6249 100644
--- a/attribute/parser.mbty
+++ b/attribute/parser.mbty
@@ -115,11 +115,14 @@
 %token ENUMVIEW "enumview"
 %token DECLARE         "declare"
 %token NORAISE "noraise"
+%token NOBREAK         "nobreak"
 %token WHERE           "where"
 %token TRY_QUESTION    "try?"
 %token TRY_EXCLAMATION "try!"
 %token LEXMATCH        "lexmatch"
 %token LEXMATCH_QUESTION "lexmatch?"
+%token PACKAGE         "package"
+
 
 %right BARBAR
 %right AMPERAMPER
diff --git a/handrolled_parser/parser.mbt b/handrolled_parser/parser.mbt
index 1d3b4f93..900b11db 100644
--- a/handrolled_parser/parser.mbt
+++ b/handrolled_parser/parser.mbt
@@ -361,16 +361,7 @@ fn State::parse_local_type_decl(self : Self) -> @syntax.LocalTypeDecl {
           self.expect_token(TK_RPAREN)
           TupleStruct(@list.from_array(ts))
         }
-        _ => {
-          let fields = self.surround_series(
-            invalid_delims=[TK_COMMA],
-            left=TK_LBRACE,
-            right=TK_RBRACE,
-            delim=TK_SEMI,
-            State::parse_field_decl,
-          )
-          Record(@list.from_array(fields))
-        }
+        _ => self.parse_struct_body(allow_constr=false)
       }
       let deriving = self.parse_deriving_directive_list()
       { tycon, tycon_loc, components, deriving }
@@ -431,8 +422,10 @@ fn State::parse_fun_decl(
       vis: Default,
       doc: @syntax.DocString::empty(),
       attrs,
+      loc,
     }
   }
+  let spos = self.peek_spos()
   let is_async = if self.peek_token() is ASYNC {
     let loc = self.peek_location()
     self.skip()
@@ -460,6 +453,7 @@ fn State::parse_fun_decl(
   })
   let params_loc = self.loc_start_with(param_loc_start)
   let (return_type, error_type) = self.parse_func_return_type()
+  let loc = self.loc_start_with(spos)
   {
     name,
     has_error,
@@ -473,6 +467,7 @@ fn State::parse_fun_decl(
     vis: Default,
     doc: @syntax.DocString::empty(),
     attrs,
+    loc,
   }
 }
 
@@ -506,57 +501,7 @@ fn State::parse_trait_method_decl(self : Self) -> @syntax.TraitMethodDecl {
   let has_error = self.parse_optional_bang()
   let quantifiers = self.parse_opt_typ_params()
   self.pop_sync(TK_LPAREN)
-  self.expect_token(TK_LPAREN)
-  let (params, _) = self.series_with_follow(
-    delim=TK_COMMA,
-    follow_set=[TK_RPAREN],
-    fn(state) -> @syntax.Parameter {
-      match state.peek_token() {
-        // `label~ : Type`
-        POST_LABEL(binder_name) => {
-          let binder_loc = Location::trim_last_char(state.peek_location())
-          state.skip()
-          let binder : @syntax.Binder = { name: binder_name, loc: binder_loc }
-          state.expect_token(TK_COLON)
-          let typ = state.parse_type()
-          Labelled(binder~, ty=Some(typ))
-        }
-        LIDENT(_) => {
-          let binder_loc = state.peek_location()
-          let binder_name = state.expect_lident(context="parameter name")
-          let binder : @syntax.Binder = { name: binder_name, loc: binder_loc }
-          let has_question = state.peek_token() is QUESTION
-          if has_question {
-            state.skip()
-          }
-          state.expect_token(TK_COLON)
-          let typ = state.parse_type()
-          if has_question {
-            QuestionOptional(binder~, ty=Some(typ))
-          } else {
-            Positional(binder~, ty=Some(typ))
-          }
-        }
-        tok if first_type_.contains(tok.kind()) => {
-          let typ = state.parse_type()
-          let loc = typ.loc()
-          DiscardPositional(ty=Some(typ), loc~)
-        }
-        other => {
-          let other_loc = state.peek_location()
-          state.report_unexpected(
-            other,
-            [TK_POST_LABEL, ..first_type_],
-            other_loc,
-          )
-          let loc = state.panic()
-          DiscardPositional(ty=None, loc~)
-        }
-      }
-    },
-  )
-  let params = params |> @list.from_array
-  self.expect_token(TK_RPAREN)
+  let params = self.parse_trait_method_params()
   let (return_type, error_type) = self.parse_func_return_type()
   let has_default = if self.peek_token() is EQUAL {
     self.skip()
@@ -1068,16 +1013,7 @@ fn State::parse_top(self : Self) -> @syntax.Impl {
           self.expect_token(TK_RPAREN)
           TupleStruct(@list.from_array(ts))
         }
-        _ => {
-          let fields = self.surround_series(
-            invalid_delims=[TK_COMMA],
-            left=TK_LBRACE,
-            right=TK_RBRACE,
-            delim=TK_SEMI,
-            State::parse_field_decl,
-          )
-          Record(@list.from_array(fields))
-        }
+        _ => self.parse_struct_body(allow_constr=true)
       }
       let deriving = self.parse_deriving_directive_list()
       let loc = self.loc_start_with(spos)
@@ -1801,6 +1737,53 @@ fn State::parse_top(self : Self) -> @syntax.Impl {
   }
 }
 
+///|
+fn State::parse_struct_body(
+  self : State,
+  allow_constr~ : Bool,
+) -> @syntax.TypeDesc {
+  let foc_list = self.surround_series(
+    invalid_delims=[TK_COMMA],
+    left=TK_LBRACE,
+    right=TK_RBRACE,
+    delim=TK_SEMI,
+    State::parse_field_decl_or_constr_decl,
+  )
+  let mut fields = @list.empty()
+  fn check_fields(field_or_constr_list : ArrayView[FieldOrConstr]) -> Unit {
+    match field_or_constr_list {
+      [] => ()
+      [.. rest, Constr(constr_decl)] => {
+        self.report_error({
+          loc: constr_decl.loc,
+          msg: "Constructor function declaration can only occur at the end of `struct` declaration.",
+        })
+        check_fields(rest)
+      }
+      [.. rest, Field(field)] => {
+        fields = fields.add(field)
+        check_fields(rest)
+      }
+    }
+  }
+  let constr_decl = if foc_list is [.. fields, Constr(constr_decl)] {
+    check_fields(fields)
+    if allow_constr {
+      Some(constr_decl)
+    } else {
+      self.report_error({
+        loc: constr_decl.loc,
+        msg: "Constructor function declaration is not allowed in local type declaration.",
+      })
+      None
+    }
+  } else {
+    check_fields(foc_list)
+    None
+  }
+  Record(fields~, constr_decl~)
+}
+
 ///|
 fn State::parse_deriving_directive_list(
   self : Self,
@@ -1849,9 +1832,69 @@ fn State::parse_deriving_directive(self : Self) -> @syntax.DerivingDirective {
 }
 
 ///|
-fn State::parse_field_decl(self : Self) -> @syntax.FieldDecl {
+priv enum FieldOrConstr {
+  Field(@syntax.FieldDecl)
+  Constr(@syntax.FunDecl)
+}
+
+///|
+fn State::parse_trait_method_params(self : State) -> @syntax.Parameters {
+  let params = self.surround_series(
+    delim=TK_COMMA,
+    left=TK_LPAREN,
+    right=TK_RPAREN,
+    fn(state) -> @syntax.Parameter {
+      match state.peek_token() {
+        // `label~ : Type`
+        POST_LABEL(binder_name) => {
+          let binder_loc = Location::trim_last_char(state.peek_location())
+          state.skip()
+          let binder : @syntax.Binder = { name: binder_name, loc: binder_loc }
+          state.expect_token(TK_COLON)
+          let typ = state.parse_type()
+          Labelled(binder~, ty=Some(typ))
+        }
+        LIDENT(_) => {
+          let binder_loc = state.peek_location()
+          let binder_name = state.expect_lident(context="parameter name")
+          let binder : @syntax.Binder = { name: binder_name, loc: binder_loc }
+          let has_question = state.peek_token() is QUESTION
+          if has_question {
+            state.skip()
+          }
+          state.expect_token(TK_COLON)
+          let typ = state.parse_type()
+          if has_question {
+            QuestionOptional(binder~, ty=Some(typ))
+          } else {
+            Positional(binder~, ty=Some(typ))
+          }
+        }
+        tok if first_type_.contains(tok.kind()) => {
+          let typ = state.parse_type()
+          let loc = typ.loc()
+          DiscardPositional(ty=Some(typ), loc~)
+        }
+        other => {
+          let other_loc = state.peek_location()
+          state.report_unexpected(
+            other,
+            [TK_POST_LABEL, ..first_type_],
+            other_loc,
+          )
+          let loc = state.panic()
+          DiscardPositional(ty=None, loc~)
+        }
+      }
+    },
+  )
+  params |> @list.from_array
+}
+
+///|
+fn State::parse_field_decl_or_constr_decl(self : Self) -> FieldOrConstr {
   if self.mode is Panic(loc~, ..) {
-    return {
+    return Field({
       name: { label: "?field_name", loc },
       ty: Any(loc~),
       mut_: false,
@@ -1859,30 +1902,65 @@ fn State::parse_field_decl(self : Self) -> @syntax.FieldDecl {
       doc: DocString::empty(),
       attrs: @list.empty(),
       loc,
-    }
+    })
   }
   let spos = self.peek_spos()
   let attrs = self.parse_attributes()
-  let vis = self.parse_visibility()
-  let mut_ = if self.peek_token() is MUTABLE {
-    self.expect_token(TK_MUTABLE)
-    true
-  } else {
-    false
-  }
-  let name_loc = self.peek_location()
-  let name = self.expect_lident(context="struct field name")
-  self.expect_token(TK_COLON)
-  let ty = self.parse_type()
-  let loc = self.loc_start_with(spos)
-  {
-    name: { label: name, loc: name_loc },
-    ty,
-    mut_,
-    vis,
-    loc,
-    attrs,
-    doc: DocString::empty(),
+  match self.peek_token() {
+    ASYNC | FN => {
+      let is_async = if self.peek_token() is ASYNC {
+        let loc = self.peek_location()
+        self.skip()
+        Some(loc)
+      } else {
+        None
+      }
+      self.expect_token(TK_FN)
+      let quantifiers = self.parse_opt_typ_params()
+      let name = self.parse_binder(context="name of `fn`")
+      let param_loc_start = self.peek_spos()
+      let params = self.parse_trait_method_params()
+      let params_loc = self.loc_start_with(param_loc_start)
+      let (return_type, error_type) = self.parse_func_return_type()
+      Constr({
+        name,
+        has_error: None,
+        is_async,
+        type_name: None,
+        quantifiers,
+        params_loc,
+        decl_params: Some(params),
+        return_type,
+        error_type,
+        vis: Default,
+        doc: DocString::empty(),
+        attrs,
+        loc: self.loc_start_with(spos),
+      })
+    }
+    _ => {
+      let vis = self.parse_visibility()
+      let mut_ = if self.peek_token() is MUTABLE {
+        self.expect_token(TK_MUTABLE)
+        true
+      } else {
+        false
+      }
+      let name_loc = self.peek_location()
+      let name = self.expect_lident(context="struct field name")
+      self.expect_token(TK_COLON)
+      let ty = self.parse_type()
+      let loc = self.loc_start_with(spos)
+      Field({
+        name: { label: name, loc: name_loc },
+        ty,
+        mut_,
+        vis,
+        loc,
+        attrs,
+        doc: DocString::empty(),
+      })
+    }
   }
 }
 
@@ -2985,11 +3063,11 @@ fn State::parse_try_expr(self : Self) -> @syntax.Expr {
       State::parse_case,
     )
     |> @list.from_array
-  let (try_else, else_loc) = if self.peek_token() is (ELSE | NORAISE) {
+  let (try_else, else_loc) = if self.peek_token() is NORAISE {
     let else_spos = self.peek_spos()
     self.skip()
     let lbrace_epos = self.peek_epos()
-    // the else_loc is the location of `else {` or `noraise {`
+    // the else_loc is the location of `noraise {`
     let else_loc : Location = { start: else_spos, end: lbrace_epos }
     let try_else_cases = self.surround_series(
         invalid_delims=[TK_COMMA],
@@ -3197,6 +3275,7 @@ fn State::parse_lexmatch_case(self : State) -> @syntax.LexCase {
       @syntax.LexCase::{
         pat: @list.singleton(Wildcard(loc~)),
         pat_loc: loc,
+        guard_: None,
         body: Hole(loc~, kind=Todo),
       }
     }
@@ -3205,12 +3284,43 @@ fn State::parse_lexmatch_case(self : State) -> @syntax.LexCase {
         [TK_FAT_ARROW, TK_COMMA],
         State::parse_lex_pattern,
       )
+      let guard_ = self.parse_lex_case_guard()
       let act = self.parse_fat_arrow_action()
-      { pat, pat_loc, body: act }
+      { pat, pat_loc, guard_, body: act }
     }
   }
 }
 
+///|
+fn State::parse_lex_case_guard(self : State) -> @syntax.Expr? {
+  match self.peek_token() {
+    IF => {
+      self.skip()
+      // an error production to handle `lex pattern if invalid-infix-expr => action`
+      let expr = match self.peek_token() {
+        IF
+        | MATCH
+        | LOOP
+        | WHILE
+        | FOR
+        | TRY
+        | TRY_QUESTION
+        | TRY_EXCLAMATION
+        | LET
+        | LETREC
+        | GUARD
+        | BREAK
+        | RETURN
+        | CONTINUE =>
+          self.handle_unexpected_expr_or_statement(context="lex case guard")
+        _ => self.parse_infix_expr(parsed=None)
+      }
+      Some(expr)
+    }
+    _ => None
+  }
+}
+
 ///|
 fn State::parse_lex_pattern(
   self : State,
@@ -3626,16 +3736,34 @@ fn State::parse_simple_try_expr(
           State::parse_case,
         )
         |> @list.from_array
+      let (try_else, else_loc) = if self.peek_token() is NORAISE {
+        let else_spos = self.peek_spos()
+        self.skip()
+        let lbrace_epos = self.peek_epos()
+        // the else_loc is the location of `else {` or `noraise {`
+        let else_loc : Location = { start: else_spos, end: lbrace_epos }
+        let try_else_cases = self.surround_series(
+            invalid_delims=[TK_COMMA],
+            left=TK_LBRACE,
+            right=TK_RBRACE,
+            delim=TK_SEMI,
+            State::parse_case,
+          )
+          |> @list.from_array
+        (Some(try_else_cases), else_loc)
+      } else {
+        (None, @syntax.no_location)
+      }
       let loc = self.loc_start_with(spos)
       Try(
         body=e,
         catch_=catch_cases,
         catch_all~,
-        try_else=None,
+        try_else~,
         has_try=false,
         try_loc=catch_loc,
         catch_loc~,
-        else_loc=@syntax.no_location,
+        else_loc~,
         loc~,
       )
     }
diff --git a/lexer/asi.mbt b/lexer/asi.mbt
index 562e5b9f..138d8558 100644
--- a/lexer/asi.mbt
+++ b/lexer/asi.mbt
@@ -48,6 +48,7 @@ fn can_occur_before_semicolon(token : Token) -> Bool {
     | SEMI(_)
     | PLUS
     | PACKAGE_NAME(_)
+    | PACKAGE
     | NEWLINE
     | MUTABLE
     | MINUS
@@ -115,7 +116,8 @@ fn can_occur_before_semicolon(token : Token) -> Bool {
     | USING
     | LEXMATCH
     | LEXMATCH_QUESTION
-    | WHERE => false
+    | WHERE
+    | NOBREAK => false
   }
 }
 
@@ -154,6 +156,7 @@ fn can_occur_after_semicolon(token : Token) -> Bool {
     | TRAIT
     | TRAITALIAS
     | PACKAGE_NAME(_)
+    | PACKAGE
     | MUTABLE
     | MATCH
     | TRY
@@ -268,7 +271,8 @@ fn can_occur_after_semicolon(token : Token) -> Bool {
     | RANGE_EXCLUSIVE_REV
     | AND
     | LEXMATCH_QUESTION
-    | WHERE => false
+    | WHERE
+    | NOBREAK => false
   }
 }
 
diff --git a/lexer/keywords.mbt b/lexer/keywords.mbt
index c0505771..ef33f2eb 100644
--- a/lexer/keywords.mbt
+++ b/lexer/keywords.mbt
@@ -51,6 +51,7 @@ let keyword_table : @hashmap.HashMap[String, Token] = [
     ("lexmatch", LEXMATCH),
     ("where", WHERE),
     ("declare", DECLARE),
+    ("nobreak", NOBREAK),
   ]
   |> @hashmap.from_array()
 
diff --git a/mbti_ast/imports.mbt b/mbti_ast/imports.mbt
index ed0df5b9..445aab17 100644
--- a/mbti_ast/imports.mbt
+++ b/mbti_ast/imports.mbt
@@ -15,7 +15,11 @@ pub using @syntax {
   type ConstrName,
   type ConstrParam,
   type Label,
+  type Parameter,
 }
 
 ///|
 pub type QualifiedIdent = @syntax.LongIdent
+
+///|
+pub type Attributes = @list.List[@attribute.Attribute]
diff --git a/mbti_ast/mbti_ast.mbt b/mbti_ast/mbti_ast.mbt
index 31100838..99c639b5 100644
--- a/mbti_ast/mbti_ast.mbt
+++ b/mbti_ast/mbti_ast.mbt
@@ -23,36 +23,41 @@ pub(all) enum TypeParamNoConstraints {
 }
 
 ///|
-pub(all) enum Parameter {
-  Positional(Type)
-  Labelled(Label, Type)
-  Autofill(Label, Type)
-  OptionalDefault(Label, Type)
-  OptionalOption(Label, Type)
-}
-
-///|
-pub(all) enum TraitMethodParameter {
-  Positional(Type)
-  Labelled(Label, Type)
+pub(all) struct MethodSelfType {
+  name : String
+  is_object : Bool
+  loc : Location
 }
 
 ///|
 pub(all) struct FuncSig {
-  attr : @list.List[(String, String?, String)]
-  type_name : Name?
+  attrs : Attributes
+  type_name : MethodSelfType?
   name : Name
   params : @list.List[Parameter]
   return_ : (Type, ErrorType)
   type_params : @list.List[TypeParamWithConstraints]
+  is_async : Location?
+}
+
+///|
+pub(all) enum TypeDefinition {
+  Abstract
+  Newtype(Type)
+  TupleStruct(@list.List[Type])
+  Error(@syntax.ExceptionDecl)
+  Variant(@list.List[ConstrDecl])
+  Record(fields~ : @list.List[FieldDecl], constr~ : FuncSig?)
+  Alias(Type)
 }
 
 ///|
 pub(all) struct TypeSig {
   name : Name
   type_params : @list.List[TypeParamNoConstraints]
-  components : TypeDesc
+  components : TypeDefinition
   vis : Visibility
+  attrs : Attributes
 }
 
 ///|
@@ -61,18 +66,26 @@ pub(all) enum AliasSig {
     name~ : Name,
     type_params~ : @list.List[TypeParamNoConstraints],
     type_~ : Type,
-    vis~ : Visibility
+    vis~ : Visibility,
+    attrs~ : Attributes
+  )
+  Using(
+    pkg~ : Name,
+    target~ : Name,
+    name~ : Name?,
+    kind~ : @syntax.UsingKind,
+    attrs~ : Attributes
   )
-  TraitAlias(name~ : Name, trait_name~ : QualifiedName, vis~ : Visibility)
-  FnAlias(name~ : Name, type_name~ : QualifiedName, loc~ : Location)
+  FuncAlias(name~ : Name, type_name~ : Name, attrs~ : Attributes)
 }
 
 ///|
 pub(all) struct TraitMethodSig {
   name : Name
-  params : @list.List[TraitMethodParameter]
+  params : @list.List[Parameter]
   has_default : Bool
   return_ : (Type, ErrorType)
+  attrs : Attributes
 }
 
 ///|
@@ -81,16 +94,15 @@ pub(all) struct TraitSig {
   super_traits : @list.List[QualifiedName]
   methods : @list.List[TraitMethodSig]
   vis : Visibility
+  attrs : Attributes
 }
 
 ///|
-pub(all) enum ImplSig {
-  Trait(
-    type_params~ : @list.List[TypeParamWithConstraints],
-    type_~ : Type,
-    trait_name~ : QualifiedName
-  )
-  DefaultImpl(trait_name~ : Name, method_name~ : Name)
+pub(all) struct ImplSig {
+  type_params : @list.List[TypeParamWithConstraints]
+  type_ : Type
+  trait_name : QualifiedName
+  attrs : Attributes
 }
 
 ///|
@@ -98,12 +110,14 @@ pub(all) struct ConstSig {
   name : Name
   type_ : Type
   value : Constant
+  attrs : Attributes
 }
 
 ///|
 pub(all) struct ValueSig {
   name : Name
   type_ : Type
+  attrs : Attributes
 }
 
 ///|
@@ -123,9 +137,25 @@ pub(all) enum Sig {
   Value(ValueSig)
 }
 
+///|
+pub fn Sig::attrs(self : Sig) -> Attributes {
+  match self {
+    Const({ attrs, .. })
+    | Impl({ attrs, .. })
+    | Trait({ attrs, .. })
+    | Alias(Using(attrs~, ..))
+    | Alias(TypeAlias(attrs~, ..))
+    | Alias(FuncAlias(attrs~, ..))
+    | Type({ attrs, .. })
+    | Func({ attrs, .. })
+    | Value({ attrs, .. }) => attrs
+  }
+}
+
 ///|
 pub(all) struct Mbti {
   package_name : String
   imports : @list.List[PackageImport]
   sigs : @list.List[(Sig, Location)]
+  loc : Location
 }
diff --git a/mbti_ast/moon.pkg b/mbti_ast/moon.pkg
index 98a70539..04313913 100644
--- a/mbti_ast/moon.pkg
+++ b/mbti_ast/moon.pkg
@@ -1,4 +1,5 @@
 import {
+  "moonbitlang/parser/attribute",
   "moonbitlang/parser/basic",
   "moonbitlang/parser/syntax",
   "moonbitlang/core/list",
diff --git a/mbti_ast/pkg.generated.mbti b/mbti_ast/pkg.generated.mbti
index 336511e3..78151ef1 100644
--- a/mbti_ast/pkg.generated.mbti
+++ b/mbti_ast/pkg.generated.mbti
@@ -3,6 +3,7 @@ package "moonbitlang/parser/mbti_ast"
 
 import {
   "moonbitlang/core/list",
+  "moonbitlang/parser/attribute",
   "moonbitlang/parser/basic",
   "moonbitlang/parser/syntax",
 }
@@ -13,35 +14,46 @@ import {
 
 // Types and methods
 pub(all) enum AliasSig {
-  TypeAlias(name~ : Name, type_params~ : @list.List[TypeParamNoConstraints], type_~ : @syntax.Type, vis~ : @syntax.Visibility)
-  TraitAlias(name~ : Name, trait_name~ : QualifiedName, vis~ : @syntax.Visibility)
-  FnAlias(name~ : Name, type_name~ : QualifiedName, loc~ : @basic.Location)
+  TypeAlias(name~ : Name, type_params~ : @list.List[TypeParamNoConstraints], type_~ : @syntax.Type, vis~ : @syntax.Visibility, attrs~ : @list.List[@attribute.Attribute])
+  Using(pkg~ : Name, target~ : Name, name~ : Name?, kind~ : @syntax.UsingKind, attrs~ : @list.List[@attribute.Attribute])
+  FuncAlias(name~ : Name, type_name~ : Name, attrs~ : @list.List[@attribute.Attribute])
 }
 
 pub(all) struct ConstSig {
   name : Name
   type_ : @syntax.Type
   value : @syntax.Constant
+  attrs : @list.List[@attribute.Attribute]
 }
 
 pub(all) struct FuncSig {
-  attr : @list.List[(String, String?, String)]
-  type_name : Name?
+  attrs : @list.List[@attribute.Attribute]
+  type_name : MethodSelfType?
   name : Name
-  params : @list.List[Parameter]
+  params : @list.List[@syntax.Parameter]
   return_ : (@syntax.Type, @syntax.ErrorType)
   type_params : @list.List[TypeParamWithConstraints]
+  is_async : @basic.Location?
 }
 
-pub(all) enum ImplSig {
-  Trait(type_params~ : @list.List[TypeParamWithConstraints], type_~ : @syntax.Type, trait_name~ : QualifiedName)
-  DefaultImpl(trait_name~ : Name, method_name~ : Name)
+pub(all) struct ImplSig {
+  type_params : @list.List[TypeParamWithConstraints]
+  type_ : @syntax.Type
+  trait_name : QualifiedName
+  attrs : @list.List[@attribute.Attribute]
 }
 
 pub(all) struct Mbti {
   package_name : String
   imports : @list.List[PackageImport]
   sigs : @list.List[(Sig, @basic.Location)]
+  loc : @basic.Location
+}
+
+pub(all) struct MethodSelfType {
+  name : String
+  is_object : Bool
+  loc : @basic.Location
 }
 
 pub(all) struct Name {
@@ -55,14 +67,6 @@ pub(all) struct PackageImport {
   alias_ : String?
 }
 
-pub(all) enum Parameter {
-  Positional(@syntax.Type)
-  Labelled(@syntax.Label, @syntax.Type)
-  Autofill(@syntax.Label, @syntax.Type)
-  OptionalDefault(@syntax.Label, @syntax.Type)
-  OptionalOption(@syntax.Label, @syntax.Type)
-}
-
 pub(all) struct QualifiedName {
   name : @syntax.LongIdent
   loc : @basic.Location
@@ -77,17 +81,14 @@ pub(all) enum Sig {
   Const(ConstSig)
   Value(ValueSig)
 }
-
-pub(all) enum TraitMethodParameter {
-  Positional(@syntax.Type)
-  Labelled(@syntax.Label, @syntax.Type)
-}
+pub fn Sig::attrs(Self) -> @list.List[@attribute.Attribute]
 
 pub(all) struct TraitMethodSig {
   name : Name
-  params : @list.List[TraitMethodParameter]
+  params : @list.List[@syntax.Parameter]
   has_default : Bool
   return_ : (@syntax.Type, @syntax.ErrorType)
+  attrs : @list.List[@attribute.Attribute]
 }
 
 pub(all) struct TraitSig {
@@ -95,6 +96,17 @@ pub(all) struct TraitSig {
   super_traits : @list.List[QualifiedName]
   methods : @list.List[TraitMethodSig]
   vis : @syntax.Visibility
+  attrs : @list.List[@attribute.Attribute]
+}
+
+pub(all) enum TypeDefinition {
+  Abstract
+  Newtype(@syntax.Type)
+  TupleStruct(@list.List[@syntax.Type])
+  Error(@syntax.ExceptionDecl)
+  Variant(@list.List[@syntax.ConstrDecl])
+  Record(fields~ : @list.List[@syntax.FieldDecl], constr~ : FuncSig?)
+  Alias(@syntax.Type)
 }
 
 pub(all) enum TypeParamNoConstraints {
@@ -110,16 +122,20 @@ pub(all) struct TypeParamWithConstraints {
 pub(all) struct TypeSig {
   name : Name
   type_params : @list.List[TypeParamNoConstraints]
-  components : @syntax.TypeDesc
+  components : TypeDefinition
   vis : @syntax.Visibility
+  attrs : @list.List[@attribute.Attribute]
 }
 
 pub(all) struct ValueSig {
   name : Name
   type_ : @syntax.Type
+  attrs : @list.List[@attribute.Attribute]
 }
 
 // Type aliases
+pub type Attributes = @list.List[@attribute.Attribute]
+
 pub using @syntax {type Constant}
 
 pub using @syntax {type ConstrDecl}
@@ -138,6 +154,8 @@ pub using @syntax {type FieldName}
 
 pub using @syntax {type Label}
 
+pub using @syntax {type Parameter}
+
 pub using @syntax {type LongIdent as QualifiedIdent}
 
 pub using @syntax {type Type}
diff --git a/mbti_parser/imports.mbt b/mbti_parser/imports.mbt
index dd096f16..3bdbc9bf 100644
--- a/mbti_parser/imports.mbt
+++ b/mbti_parser/imports.mbt
@@ -31,7 +31,6 @@ using @mbti_ast {
   type Parameter,
   type TypeParamNoConstraints,
   type TypeParamWithConstraints,
-  type TraitMethodParameter,
   type FieldDecl,
   type FieldName,
   type ConstrDecl,
@@ -49,4 +48,6 @@ using @mbti_ast {
   type Sig,
   type PackageImport,
   type Mbti,
+  type MethodSelfType,
+  type TypeDefinition,
 }
diff --git a/mbti_parser/mbti_parser.mbt b/mbti_parser/mbti_parser.mbt
index aaec0f09..46a234d0 100644
--- a/mbti_parser/mbti_parser.mbt
+++ b/mbti_parser/mbti_parser.mbt
@@ -56,8 +56,13 @@ priv suberror YYObj_Option_Bool_ {
 }
 
 ///|
-priv suberror YYObj_Option_Name_ {
-  YYObj_Option_Name_(Name?)
+priv suberror YYObj_Option_Type_ {
+  YYObj_Option_Type_(Type?)
+}
+
+///|
+priv suberror YYObj_Option_MethodSelfType_ {
+  YYObj_Option_MethodSelfType_(MethodSelfType?)
 }
 
 ///|
@@ -185,14 +190,19 @@ priv suberror YYObj_StringLiteral {
   YYObj_StringLiteral(StringLiteral)
 }
 
+///|
+priv suberror YYObj_MethodSelfType {
+  YYObj_MethodSelfType(MethodSelfType)
+}
+
 ///|
 priv suberror YYObj_TraitMethodSig {
   YYObj_TraitMethodSig(TraitMethodSig)
 }
 
 ///|
-priv suberror YYObj_TraitMethodParameter {
-  YYObj_TraitMethodParameter(TraitMethodParameter)
+priv suberror YYObj_TypeDefinition {
+  YYObj_TypeDefinition(TypeDefinition)
 }
 
 ///|
@@ -215,11 +225,6 @@ priv suberror YYObj__list_List_Attribute_ {
   YYObj__list_List_Attribute_(@list.List[Attribute])
 }
 
-///|
-priv suberror YYObj__list_List_FieldDecl_ {
-  YYObj__list_List_FieldDecl_(@list.List[FieldDecl])
-}
-
 ///|
 priv suberror YYObj__list_List_Parameter_ {
   YYObj__list_List_Parameter_(@list.List[Parameter])
@@ -250,11 +255,6 @@ priv suberror YYObj__list_List_TraitMethodSig_ {
   YYObj__list_List_TraitMethodSig_(@list.List[TraitMethodSig])
 }
 
-///|
-priv suberror YYObj__list_List_TraitMethodParameter_ {
-  YYObj__list_List_TraitMethodParameter_(@list.List[TraitMethodParameter])
-}
-
 ///|
 priv suberror YYObj__list_List_TypeParamNoConstraints_ {
   YYObj__list_List_TypeParamNoConstraints_(@list.List[TypeParamNoConstraints])
@@ -273,10 +273,8 @@ priv suberror YYObj__list_List__Sig__Location__ {
 }
 
 ///|
-priv suberror YYObj__list_List__String__Option_String___String__ {
-  YYObj__list_List__String__Option_String___String__(
-    @list.List[(String, String?, String)]
-  )
+priv suberror YYObj_Name_ {
+  YYObj_Name_(Name?)
 }
 
 ///|
@@ -306,6 +304,11 @@ priv suberror YYObj__String__Location_ {
   YYObj__String__Location_((String, Location))
 }
 
+///|
+priv suberror YYObj___list_List_FieldDecl___FuncSig__ {
+  YYObj___list_List_FieldDecl___FuncSig__((@list.List[FieldDecl], FuncSig?))
+}
+
 ///|
 priv suberror YYObj__String__Option_String___String_ {
   YYObj__String__Option_String___String_((String, String?, String))
@@ -438,12 +441,14 @@ priv enum YYSymbol {
   T_USING
   T_DECLARE
   T_NORAISE
+  T_NOBREAK
   T_WHERE
   T_ENUMVIEW
   T_TRY_QUESTION
   T_TRY_EXCLAMATION
   T_LEXMATCH
   T_LEXMATCH_QUESTION
+  T_PACKAGE
   NT_mbti
   NT_imports
   NT_package_import
@@ -451,17 +456,21 @@ priv enum YYSymbol {
   NT_sig_
   NT_const_sig
   NT_value_sig
+  NT_method_self_type_coloncolon
   NT_method_prefix
-  NT_func_sig_no_attr
   NT_func_sig
   NT_trait_method_sig
   NT_type_sig
   NT_impl_sig
   NT_trait_sig
+  NT_using_binder
   NT_alias_sig
   NT_enum_constructor
   NT_constructor_param
   NT_record_decl_field
+  NT_record_decl_constr
+  NT_record_decl_body
+  NT_record_decl_body_nonempty
   NT_type_param_with_constraints
   NT_type_params_with_constraints
   NT_type_param_no_constraints
@@ -475,7 +484,6 @@ priv enum YYSymbol {
   NT_error_type
   NT_optional_type_arguments
   NT_parameter
-  NT_trait_method_parameter
   NT_constant
   NT_pub_attr
   NT_qualified_uident
@@ -484,14 +492,13 @@ priv enum YYSymbol {
   NT_lident
   NT_label
   NT_post_label
-  NT_separated_nonempty_list_SEMI_package_import_
+  NT_separated_nonempty_list_COMMA_package_import_
   NT_loption_type_params_with_constraints_
+  NT_option_method_self_type_coloncolon_
   NT_separated_list_COMMA_parameter_
-  NT_nonempty_list_ATTRIBUTE_
-  NT_separated_list_COMMA_trait_method_parameter_
   NT_boption_eq_underscore_
+  NT_option_type__
   NT_separated_list_SEMI_enum_constructor_
-  NT_separated_list_SEMI_record_decl_field_
   NT_separated_list_COMMA_type__
   NT_separated_nonempty_list_PLUS_qualified_uident_
   NT_loption_preceded_COLON_separated_nonempty_list_PLUS_qualified_uident___
@@ -506,9 +513,7 @@ priv enum YYSymbol {
   NT_separated_nonempty_list_COMMA_type__
   NT_nonempty_list_attribute_
   NT_separated_nonempty_list_COMMA_parameter_
-  NT_separated_nonempty_list_COMMA_trait_method_parameter_
   NT_separated_nonempty_list_SEMI_enum_constructor_
-  NT_separated_nonempty_list_SEMI_record_decl_field_
   NT_separated_nonempty_list_COMMA_type_param_with_constraints_
   NT_separated_nonempty_list_COMMA_type_param_no_constraints_
   EOI
@@ -525,7 +530,7 @@ fn init {
 }
 
 // file:///./mbti_parser.mbty
-// 122|    LIDENT STRING ioption(";") imports sigs EOF { Mbti::{package_name: $2, imports: $4, sigs: $5} }
+// 124|    PACKAGE STRING ioption(";") imports sigs EOF { Mbti::{package_name: $2, imports: $4, sigs: $5, loc : mk_loc($sloc)} }
 
 ///|
 fn yy_action_0(
@@ -536,10 +541,21 @@ fn yy_action_0(
   guard _args[1].0 is YYObj_StringLiteral(_dollar2)
   guard _args[2].0 is YYObj__list_List_PackageImport_(_dollar4)
   guard _args[3].0 is YYObj__list_List__Sig__Location__(_dollar5)
+  let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
+  let _end_pos = if _args.length() == 0 {
+    _last_pos
+  } else {
+    _args[_args.length() - 1].2
+  }
   YYObj_Mbti(
     {
       ()
-      Mbti::{ package_name: _dollar2, imports: _dollar4, sigs: _dollar5 }
+      Mbti::{
+        package_name: _dollar2,
+        imports: _dollar4,
+        sigs: _dollar5,
+        loc: mk_loc((_symbol_start_pos, _end_pos)),
+      }
     },
   )
 }
@@ -561,7 +577,7 @@ fn yy_action_1(
 }
 
 // file:///./mbti_parser.mbty
-// 122|    LIDENT STRING ioption(";") imports sigs EOF { Mbti::{package_name: $2, imports: $4, sigs: $5} }
+// 124|    PACKAGE STRING ioption(";") imports sigs EOF { Mbti::{package_name: $2, imports: $4, sigs: $5, loc : mk_loc($sloc)} }
 
 ///|
 fn yy_action_2(
@@ -572,10 +588,21 @@ fn yy_action_2(
   guard _args[1].0 is YYObj_StringLiteral(_dollar2)
   guard _args[3].0 is YYObj__list_List_PackageImport_(_dollar4)
   guard _args[4].0 is YYObj__list_List__Sig__Location__(_dollar5)
+  let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
+  let _end_pos = if _args.length() == 0 {
+    _last_pos
+  } else {
+    _args[_args.length() - 1].2
+  }
   YYObj_Mbti(
     {
       ()
-      Mbti::{ package_name: _dollar2, imports: _dollar4, sigs: _dollar5 }
+      Mbti::{
+        package_name: _dollar2,
+        imports: _dollar4,
+        sigs: _dollar5,
+        loc: mk_loc((_symbol_start_pos, _end_pos)),
+      }
     },
   )
 }
@@ -598,7 +625,7 @@ fn yy_action_3(
 }
 
 // file:///./mbti_parser.mbty
-// 138|    sig_ ";" sigs { $3.add(($1, mk_loc($loc($1)))) }
+// 140|    sig_ ";" sigs { $3.add(($1, mk_loc($loc($1)))) }
 
 ///|
 fn yy_action_4(
@@ -618,7 +645,7 @@ fn yy_action_4(
 }
 
 // file:///./mbti_parser.mbty
-// 137|    sig_ { @list.singleton(($1, mk_loc($sloc))) }
+// 139|    sig_ { @list.singleton(($1, mk_loc($sloc))) }
 
 ///|
 fn yy_action_5(
@@ -641,7 +668,7 @@ fn yy_action_5(
 }
 
 // file:///./mbti_parser.mbty
-// 142|    func_sig { Func($1) }
+// 144|    func_sig { Func($1) }
 
 ///|
 fn yy_action_6(
@@ -658,7 +685,7 @@ fn yy_action_6(
 }
 
 // file:///./mbti_parser.mbty
-// 143|    type_sig { Type($1) }
+// 145|    type_sig { Type($1) }
 
 ///|
 fn yy_action_7(
@@ -675,7 +702,7 @@ fn yy_action_7(
 }
 
 // file:///./mbti_parser.mbty
-// 144|    alias_sig { Alias($1) }
+// 146|    alias_sig { Alias($1) }
 
 ///|
 fn yy_action_8(
@@ -692,7 +719,7 @@ fn yy_action_8(
 }
 
 // file:///./mbti_parser.mbty
-// 145|    trait_sig { Trait($1) }
+// 147|    trait_sig { Trait($1) }
 
 ///|
 fn yy_action_9(
@@ -709,7 +736,7 @@ fn yy_action_9(
 }
 
 // file:///./mbti_parser.mbty
-// 146|    impl_sig { Impl($1) }
+// 148|    impl_sig { Impl($1) }
 
 ///|
 fn yy_action_10(
@@ -726,7 +753,7 @@ fn yy_action_10(
 }
 
 // file:///./mbti_parser.mbty
-// 147|    const_sig { Const($1) }
+// 149|    const_sig { Const($1) }
 
 ///|
 fn yy_action_11(
@@ -743,7 +770,7 @@ fn yy_action_11(
 }
 
 // file:///./mbti_parser.mbty
-// 148|    value_sig { Value($1) }
+// 150|    value_sig { Value($1) }
 
 ///|
 fn yy_action_12(
@@ -760,1475 +787,1903 @@ fn yy_action_12(
 }
 
 // file:///./mbti_parser.mbty
-// 152|    "const" uident ":" type_ "=" constant { ConstSig::{name: $2, type_: $4, value: $6} }
+// 154|    attributes vis "const" uident ":" type_ "=" constant { ConstSig::{name: $4, type_: $6, value: $8, attrs: $1} }
 
 ///|
 fn yy_action_13(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[1].0 is YYObj_Name(_dollar2)
-  guard _args[3].0 is YYObj_Type(_dollar4)
-  guard _args[5].0 is YYObj_Constant(_dollar6)
+  let _sub_action_0_result = yy_action_14(_last_pos, _args[0:0])
+  let _sub_action_1_result = yy_action_15(_last_pos, _args[0:0])
+  guard _args[1].0 is YYObj_Name(_dollar4)
+  guard _args[3].0 is YYObj_Type(_dollar6)
+  guard _args[5].0 is YYObj_Constant(_dollar8)
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
   YYObj_ConstSig(
     {
       ()
-      ConstSig::{ name: _dollar2, type_: _dollar4, value: _dollar6 }
+      ConstSig::{
+        name: _dollar4,
+        type_: _dollar6,
+        value: _dollar8,
+        attrs: _dollar1,
+      }
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 311|    TRUE { Bool(true) }
+// 154|    attributes vis "const" uident ":" type_ "=" constant { ConstSig::{name: $4, type_: $6, value: $8, attrs: $1} }
 
 ///|
-fn yy_action_14(
+fn yy_action_16(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  YYObj_Constant(
+  let _sub_action_0_result = yy_action_14(_last_pos, _args[0:0])
+  let _sub_action_1_result = yy_action_17(_last_pos, _args[0:1])
+  guard _args[2].0 is YYObj_Name(_dollar4)
+  guard _args[4].0 is YYObj_Type(_dollar6)
+  guard _args[6].0 is YYObj_Constant(_dollar8)
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  YYObj_ConstSig(
     {
       ()
-      Bool(true)
+      ConstSig::{
+        name: _dollar4,
+        type_: _dollar6,
+        value: _dollar8,
+        attrs: _dollar1,
+      }
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 312|    FALSE { Bool(false) }
+// 158|    attributes vis "let" lident ":" type_ { ValueSig::{ attrs: $1, name: $4, type_: $6 } }
 
 ///|
-fn yy_action_15(
+fn yy_action_18(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  YYObj_Constant(
+  let _sub_action_0_result = yy_action_14(_last_pos, _args[0:0])
+  let _sub_action_1_result = yy_action_17(_last_pos, _args[0:1])
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _args[2].0 is YYObj_Name(_dollar4)
+  guard _args[4].0 is YYObj_Type(_dollar6)
+  YYObj_ValueSig(
     {
       ()
-      Bool(false)
+      ValueSig::{ attrs: _dollar1, name: _dollar4, type_: _dollar6 }
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 313|    BYTE { Byte($1) }
+// 239|    attributes vis "type"  type_decl_name_with_params "=" type_ {
+// 240|    TypeAlias(attrs = $1, vis=$2, name=$4.0, type_params=$4.1, type_=$6) 
+// 241|  }
 
 ///|
-fn yy_action_16(
+fn yy_action_19(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[0].0 is YYObj_CharLiteral(_dollar1)
-  YYObj_Constant(
+  let _sub_action_0_result = yy_action_14(_last_pos, _args[0:0])
+  let _sub_action_1_result = yy_action_17(_last_pos, _args[0:1])
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _sub_action_1_result is YYObj_Visibility(_dollar2)
+  guard _args[2].0 is YYObj__Name___list_List_TypeParamNoConstraints__(_dollar4)
+  guard _args[4].0 is YYObj_Type(_dollar6)
+  YYObj_AliasSig(
     {
       ()
-      Byte(_dollar1)
+      TypeAlias(
+        attrs=_dollar1,
+        vis=_dollar2,
+        name=_dollar4.0,
+        type_params=_dollar4.1,
+        type_=_dollar6,
+      )
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 314|    BYTES { Bytes($1) }
+// 192|    attributes vis "type" type_decl_name_with_params {
+// 193|    TypeSig::{attrs : $1, vis: $2, name: $4.0, type_params: $4.1, components: Abstract} 
+// 194|  }
 
 ///|
-fn yy_action_17(
+fn yy_action_20(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[0].0 is YYObj_StringLiteral(_dollar1)
-  YYObj_Constant(
+  let _sub_action_0_result = yy_action_14(_last_pos, _args[0:0])
+  let _sub_action_1_result = yy_action_17(_last_pos, _args[0:1])
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _sub_action_1_result is YYObj_Visibility(_dollar2)
+  guard _args[2].0 is YYObj__Name___list_List_TypeParamNoConstraints__(_dollar4)
+  YYObj_TypeSig(
     {
       ()
-      Bytes(_dollar1)
+      TypeSig::{
+        attrs: _dollar1,
+        vis: _dollar2,
+        name: _dollar4.0,
+        type_params: _dollar4.1,
+        components: Abstract,
+      }
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 315|    CHAR { Char($1) }
+// 195|    attributes vis "suberror" uident option(type_) {
+// 196|    let exception_decl : @syntax.ExceptionDecl = match $5 {
+// 197|      None => NoPayload
+// 198|      Some(ty) => SinglePayload(ty)
+// 199|    }
+// 200|    TypeSig::{attrs : $1, vis: $2, name: $4, type_params: @list.empty(), components: Error(exception_decl)}
+// 201|  }
 
 ///|
-fn yy_action_18(
+fn yy_action_21(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[0].0 is YYObj_CharLiteral(_dollar1)
-  YYObj_Constant(
+  let _sub_action_0_result = yy_action_14(_last_pos, _args[0:0])
+  let _sub_action_1_result = yy_action_17(_last_pos, _args[0:1])
+  guard _args[3].0 is YYObj_Option_Type_(_dollar5)
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _sub_action_1_result is YYObj_Visibility(_dollar2)
+  guard _args[2].0 is YYObj_Name(_dollar4)
+  YYObj_TypeSig(
     {
       ()
-      Char(_dollar1)
+      let exception_decl : @syntax.ExceptionDecl = match _dollar5 {
+        None => NoPayload
+        Some(ty) => SinglePayload(ty)
+      }
+      TypeSig::{
+        attrs: _dollar1,
+        vis: _dollar2,
+        name: _dollar4,
+        type_params: @list.empty(),
+        components: Error(exception_decl),
+      }
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 316|    INT {
-// 317|    match $1 {
-// 318|      [.. lit, .. "UL"] => UInt64(lit.to_string())
-// 319|      [.. lit, 'L'] => Int64(lit.to_string())
-// 320|      [.. lit, 'U'] => UInt(lit.to_string())
-// 321|      [.. lit, 'N'] => BigInt(lit.to_string())
-// 322|      lit => Int(lit)
-// 323|    }
-// 324|  }
+// 202|    attributes vis "suberror" uident "{" separated_list(";", enum_constructor) "}" {
+// 203|    TypeSig::{attrs : $1, vis: $2, name: $4, type_params: @list.empty(), components: Error(EnumPayload($6))}
+// 204|  }
 
 ///|
-fn yy_action_19(
+fn yy_action_22(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[0].0 is YYObj_String(_dollar1)
-  YYObj_Constant(
+  let _sub_action_0_result = yy_action_14(_last_pos, _args[0:0])
+  let _sub_action_1_result = yy_action_17(_last_pos, _args[0:1])
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _sub_action_1_result is YYObj_Visibility(_dollar2)
+  guard _args[2].0 is YYObj_Name(_dollar4)
+  guard _args[4].0 is YYObj__list_List_ConstrDecl_(_dollar6)
+  YYObj_TypeSig(
     {
       ()
-      match _dollar1 {
-        [.. lit, .. "UL"] => UInt64(lit.to_string())
-        [.. lit, 'L'] => Int64(lit.to_string())
-        [.. lit, 'U'] => UInt(lit.to_string())
-        [.. lit, 'N'] => BigInt(lit.to_string())
-        lit => Int(lit)
+      TypeSig::{
+        attrs: _dollar1,
+        vis: _dollar2,
+        name: _dollar4,
+        type_params: @list.empty(),
+        components: Error(EnumPayload(_dollar6)),
       }
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 325|    FLOAT { Float($1) }
+// 205|    attributes vis "struct" type_decl_name_with_params "{" record_decl_body "}" {
+// 206|    TypeSig::{attrs : $1, vis: $2, name: $4.0, type_params: $4.1, components: $6 }
+// 207|  }
 
 ///|
-fn yy_action_20(
+fn yy_action_23(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[0].0 is YYObj_String(_dollar1)
-  YYObj_Constant(
+  let _sub_action_0_result = yy_action_14(_last_pos, _args[0:0])
+  let _sub_action_1_result = yy_action_17(_last_pos, _args[0:1])
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _sub_action_1_result is YYObj_Visibility(_dollar2)
+  guard _args[2].0 is YYObj__Name___list_List_TypeParamNoConstraints__(_dollar4)
+  guard _args[4].0 is YYObj_TypeDefinition(_dollar6)
+  YYObj_TypeSig(
     {
       ()
-      Float(_dollar1)
+      TypeSig::{
+        attrs: _dollar1,
+        vis: _dollar2,
+        name: _dollar4.0,
+        type_params: _dollar4.1,
+        components: _dollar6,
+      }
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 326|    DOUBLE { Double($1) }
+// 208|    attributes vis "struct" type_decl_name_with_params "(" separated_list(",", type_) ")" {
+// 209|    TypeSig::{attrs : $1, vis: $2, name: $4.0, type_params: $4.1, components: TupleStruct($6)}
+// 210|  }
 
 ///|
-fn yy_action_21(
+fn yy_action_24(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[0].0 is YYObj_String(_dollar1)
-  YYObj_Constant(
+  let _sub_action_0_result = yy_action_14(_last_pos, _args[0:0])
+  let _sub_action_1_result = yy_action_17(_last_pos, _args[0:1])
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _sub_action_1_result is YYObj_Visibility(_dollar2)
+  guard _args[2].0 is YYObj__Name___list_List_TypeParamNoConstraints__(_dollar4)
+  guard _args[4].0 is YYObj__list_List_Type_(_dollar6)
+  YYObj_TypeSig(
     {
       ()
-      Double(_dollar1)
+      TypeSig::{
+        attrs: _dollar1,
+        vis: _dollar2,
+        name: _dollar4.0,
+        type_params: _dollar4.1,
+        components: TupleStruct(_dollar6),
+      }
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 327|    STRING { String($1) }
+// 211|    attributes vis "enum" type_decl_name_with_params "{" separated_list(";", enum_constructor) "}" {
+// 212|    TypeSig::{attrs : $1, vis: $2, name: $4.0, type_params: $4.1, components: Variant($6)}
+// 213|  }
 
 ///|
-fn yy_action_22(
+fn yy_action_25(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[0].0 is YYObj_StringLiteral(_dollar1)
-  YYObj_Constant(
+  let _sub_action_0_result = yy_action_14(_last_pos, _args[0:0])
+  let _sub_action_1_result = yy_action_17(_last_pos, _args[0:1])
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _sub_action_1_result is YYObj_Visibility(_dollar2)
+  guard _args[2].0 is YYObj__Name___list_List_TypeParamNoConstraints__(_dollar4)
+  guard _args[4].0 is YYObj__list_List_ConstrDecl_(_dollar6)
+  YYObj_TypeSig(
     {
       ()
-      String(_dollar1)
+      TypeSig::{
+        attrs: _dollar1,
+        vis: _dollar2,
+        name: _dollar4.0,
+        type_params: _dollar4.1,
+        components: Variant(_dollar6),
+      }
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 156|    attributes "let" lident ":" type_ { ValueSig::{name: $3, type_: $5} }
+// 217|    attributes vis "impl" type_params_with_constraints qualified_uident "for" type_ {
+// 218|    ImplSig::{type_params : $4, trait_name : $5, type_ : $7, attrs : $1}
+// 219|  }
 
 ///|
-fn yy_action_23(
+fn yy_action_26(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_24(_last_pos, _args[0:0])
-  guard _args[1].0 is YYObj_Name(_dollar3)
-  guard _args[3].0 is YYObj_Type(_dollar5)
-  YYObj_ValueSig(
+  let _sub_action_0_result = yy_action_14(_last_pos, _args[0:0])
+  let _sub_action_1_result = yy_action_17(_last_pos, _args[0:1])
+  guard _args[2].0 is YYObj__list_List_TypeParamWithConstraints_(_dollar4)
+  guard _args[3].0 is YYObj_QualifiedName(_dollar5)
+  guard _args[5].0 is YYObj_Type(_dollar7)
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  YYObj_ImplSig(
     {
       ()
-      ValueSig::{ name: _dollar3, type_: _dollar5 }
+      ImplSig::{
+        type_params: _dollar4,
+        trait_name: _dollar5,
+        type_: _dollar7,
+        attrs: _dollar1,
+      }
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 156|    attributes "let" lident ":" type_ { ValueSig::{name: $3, type_: $5} }
+// 220|    attributes vis "impl" qualified_uident "for" type_ { 
+// 221|    ImplSig::{type_params : @list.empty(), trait_name : $4, type_ : $6, attrs : $1}
+// 222|  }
 
 ///|
-fn yy_action_25(
+fn yy_action_27(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_26(_last_pos, _args[0:1])
-  guard _args[2].0 is YYObj_Name(_dollar3)
-  guard _args[4].0 is YYObj_Type(_dollar5)
-  YYObj_ValueSig(
+  let _sub_action_0_result = yy_action_14(_last_pos, _args[0:0])
+  let _sub_action_1_result = yy_action_17(_last_pos, _args[0:1])
+  guard _args[2].0 is YYObj_QualifiedName(_dollar4)
+  guard _args[4].0 is YYObj_Type(_dollar6)
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  YYObj_ImplSig(
     {
       ()
-      ValueSig::{ name: _dollar3, type_: _dollar5 }
+      ImplSig::{
+        type_params: @list.empty(),
+        trait_name: _dollar4,
+        type_: _dollar6,
+        attrs: _dollar1,
+      }
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 169|    func_sig_no_attr { $1 }
+// 226|    attributes vis "trait" uident loption(preceded(":", separated_nonempty_list("+", qualified_uident))) "{" separated_nonempty_list(";", trait_method_sig) "}" { 
+// 227|    TraitSig::{ attrs : $1, vis: $2, name: $4, super_traits: $5, methods: $7} 
+// 228|  }
 
 ///|
-fn yy_action_27(
+fn yy_action_28(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[0].0 is YYObj_FuncSig(_dollar1)
-  YYObj_FuncSig(
+  let _sub_action_0_result = yy_action_14(_last_pos, _args[0:0])
+  let _sub_action_1_result = yy_action_17(_last_pos, _args[0:1])
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _sub_action_1_result is YYObj_Visibility(_dollar2)
+  guard _args[2].0 is YYObj_Name(_dollar4)
+  guard _args[3].0 is YYObj__list_List_QualifiedName_(_dollar5)
+  guard _args[5].0 is YYObj__list_List_TraitMethodSig_(_dollar7)
+  YYObj_TraitSig(
     {
       ()
-      _dollar1
+      TraitSig::{
+        attrs: _dollar1,
+        vis: _dollar2,
+        name: _dollar4,
+        super_traits: _dollar5,
+        methods: _dollar7,
+      }
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 161|    uident "::" { Some($1) }
+// 229|    attributes vis "trait" uident {
+// 230|    TraitSig::{ attrs : $1, vis: $2, name: $4, super_traits: @list.empty(), methods: @list.empty() } 
+// 231|  }
 
 ///|
-fn yy_action_28(
+fn yy_action_29(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[0].0 is YYObj_Name(_dollar1)
-  YYObj_Option_Name_(
+  let _sub_action_0_result = yy_action_14(_last_pos, _args[0:0])
+  let _sub_action_1_result = yy_action_17(_last_pos, _args[0:1])
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _sub_action_1_result is YYObj_Visibility(_dollar2)
+  guard _args[2].0 is YYObj_Name(_dollar4)
+  YYObj_TraitSig(
     {
       ()
-      Some(_dollar1)
+      TraitSig::{
+        attrs: _dollar1,
+        vis: _dollar2,
+        name: _dollar4,
+        super_traits: @list.empty(),
+        methods: @list.empty(),
+      }
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 165|    FN loption(type_params_with_constraints) method_prefix lident delimited("(", separated_list(",", parameter), ")") "->" return_type { FuncSig::{ attr: @list.empty(), type_name: $3, name: $4, type_params: $2, params: $5, return_: $7} }
+// 245|    attributes vis "using" PACKAGE_NAME "{" "type" uident using_binder "}" {
+// 246|    let pkg = Name::{ name : $4, loc : mk_loc($loc($4)) }
+// 247|    Using(pkg~, target = $7, name = $8, kind = Type, attrs = $1)
+// 248|  }
 
 ///|
-fn yy_action_29(
+fn yy_action_30(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_30(_args[3].2, _args[4:7])
-  guard _args[2].0 is YYObj_Option_Name_(_dollar3)
-  guard _args[3].0 is YYObj_Name(_dollar4)
-  guard _args[1].0 is YYObj__list_List_TypeParamWithConstraints_(_dollar2)
-  guard _sub_action_0_result is YYObj__list_List_Parameter_(_dollar5)
-  guard _args[8].0 is YYObj__Type__ErrorType_(_dollar7)
-  YYObj_FuncSig(
+  let _sub_action_0_result = yy_action_14(_last_pos, _args[0:0])
+  let _sub_action_1_result = yy_action_17(_last_pos, _args[0:1])
+  guard _args[2].0 is YYObj_String(_dollar4)
+  let _start_pos_of_item3 = _args[2].1
+  let _end_pos_of_item3 = _args[2].2
+  guard _args[5].0 is YYObj_Name(_dollar7)
+  guard _args[6].0 is YYObj_Name_(_dollar8)
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  YYObj_AliasSig(
     {
       ()
-      FuncSig::{
-        attr: @list.empty(),
-        type_name: _dollar3,
+      let pkg = Name::{
         name: _dollar4,
-        type_params: _dollar2,
-        params: _dollar5,
-        return_: _dollar7,
+        loc: mk_loc((_start_pos_of_item3, _end_pos_of_item3)),
       }
+      Using(pkg~, target=_dollar7, name=_dollar8, kind=Type, attrs=_dollar1)
     },
   )
 }
 
-// file:///./stdlib.mbty
-// 40|    L X R { $2 }
+// file:///./mbti_parser.mbty
+// 249|    attributes vis "using" PACKAGE_NAME "{" "trait" uident using_binder "}" {
+// 250|    let pkg = Name::{ name : $4, loc : mk_loc($loc($4)) }
+// 251|    Using(pkg~, target = $7, name = $8, kind = Trait, attrs = $1)
+// 252|  }
 
 ///|
-fn yy_action_30(
+fn yy_action_31(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[1].0 is YYObj__list_List_Parameter_(_dollar2)
-  YYObj__list_List_Parameter_(
+  let _sub_action_0_result = yy_action_14(_last_pos, _args[0:0])
+  let _sub_action_1_result = yy_action_17(_last_pos, _args[0:1])
+  guard _args[2].0 is YYObj_String(_dollar4)
+  let _start_pos_of_item3 = _args[2].1
+  let _end_pos_of_item3 = _args[2].2
+  guard _args[5].0 is YYObj_Name(_dollar7)
+  guard _args[6].0 is YYObj_Name_(_dollar8)
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  YYObj_AliasSig(
     {
       ()
-      _dollar2
+      let pkg = Name::{
+        name: _dollar4,
+        loc: mk_loc((_start_pos_of_item3, _end_pos_of_item3)),
+      }
+      Using(pkg~, target=_dollar7, name=_dollar8, kind=Trait, attrs=_dollar1)
     },
   )
 }
 
-// file:///./stdlib.mbty
-// 55|    separated_nonempty_list(SEP, X) { $1 }
+// file:///./mbti_parser.mbty
+// 154|    attributes vis "const" uident ":" type_ "=" constant { ConstSig::{name: $4, type_: $6, value: $8, attrs: $1} }
 
 ///|
-fn yy_action_31(
+fn yy_action_32(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[0].0 is YYObj__list_List_Parameter_(_dollar1)
-  YYObj__list_List_Parameter_(
+  let _sub_action_0_result = yy_action_14(_last_pos, _args[0:0])
+  let _sub_action_1_result = yy_action_33(_last_pos, _args[0:2])
+  guard _args[3].0 is YYObj_Name(_dollar4)
+  guard _args[5].0 is YYObj_Type(_dollar6)
+  guard _args[7].0 is YYObj_Constant(_dollar8)
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  YYObj_ConstSig(
     {
       ()
-      _dollar1
+      ConstSig::{
+        name: _dollar4,
+        type_: _dollar6,
+        value: _dollar8,
+        attrs: _dollar1,
+      }
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 298|    type_ { Positional($1) }
+// 158|    attributes vis "let" lident ":" type_ { ValueSig::{ attrs: $1, name: $4, type_: $6 } }
 
 ///|
-fn yy_action_32(
+fn yy_action_34(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[0].0 is YYObj_Type(_dollar1)
-  YYObj_Parameter(
+  let _sub_action_0_result = yy_action_14(_last_pos, _args[0:0])
+  let _sub_action_1_result = yy_action_33(_last_pos, _args[0:2])
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _args[3].0 is YYObj_Name(_dollar4)
+  guard _args[5].0 is YYObj_Type(_dollar6)
+  YYObj_ValueSig(
     {
       ()
-      Positional(_dollar1)
+      ValueSig::{ attrs: _dollar1, name: _dollar4, type_: _dollar6 }
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 300|    post_label ":" type_ "=" ".." { OptionalDefault($1, $3) }
+// 239|    attributes vis "type"  type_decl_name_with_params "=" type_ {
+// 240|    TypeAlias(attrs = $1, vis=$2, name=$4.0, type_params=$4.1, type_=$6) 
+// 241|  }
 
 ///|
-fn yy_action_33(
+fn yy_action_35(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[0].0 is YYObj_Label(_dollar1)
-  guard _args[2].0 is YYObj_Type(_dollar3)
-  YYObj_Parameter(
+  let _sub_action_0_result = yy_action_14(_last_pos, _args[0:0])
+  let _sub_action_1_result = yy_action_33(_last_pos, _args[0:2])
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _sub_action_1_result is YYObj_Visibility(_dollar2)
+  guard _args[3].0 is YYObj__Name___list_List_TypeParamNoConstraints__(_dollar4)
+  guard _args[5].0 is YYObj_Type(_dollar6)
+  YYObj_AliasSig(
     {
       ()
-      OptionalDefault(_dollar1, _dollar3)
+      TypeAlias(
+        attrs=_dollar1,
+        vis=_dollar2,
+        name=_dollar4.0,
+        type_params=_dollar4.1,
+        type_=_dollar6,
+      )
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 301|    post_label ":" type_ "=" "_" { Autofill($1, $3) }
+// 192|    attributes vis "type" type_decl_name_with_params {
+// 193|    TypeSig::{attrs : $1, vis: $2, name: $4.0, type_params: $4.1, components: Abstract} 
+// 194|  }
 
 ///|
-fn yy_action_34(
+fn yy_action_36(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[0].0 is YYObj_Label(_dollar1)
-  guard _args[2].0 is YYObj_Type(_dollar3)
-  YYObj_Parameter(
+  let _sub_action_0_result = yy_action_14(_last_pos, _args[0:0])
+  let _sub_action_1_result = yy_action_33(_last_pos, _args[0:2])
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _sub_action_1_result is YYObj_Visibility(_dollar2)
+  guard _args[3].0 is YYObj__Name___list_List_TypeParamNoConstraints__(_dollar4)
+  YYObj_TypeSig(
     {
       ()
-      Autofill(_dollar1, _dollar3)
+      TypeSig::{
+        attrs: _dollar1,
+        vis: _dollar2,
+        name: _dollar4.0,
+        type_params: _dollar4.1,
+        components: Abstract,
+      }
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 299|    post_label ":" type_ { Labelled($1, $3) }
+// 195|    attributes vis "suberror" uident option(type_) {
+// 196|    let exception_decl : @syntax.ExceptionDecl = match $5 {
+// 197|      None => NoPayload
+// 198|      Some(ty) => SinglePayload(ty)
+// 199|    }
+// 200|    TypeSig::{attrs : $1, vis: $2, name: $4, type_params: @list.empty(), components: Error(exception_decl)}
+// 201|  }
 
 ///|
-fn yy_action_35(
+fn yy_action_37(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[0].0 is YYObj_Label(_dollar1)
-  guard _args[2].0 is YYObj_Type(_dollar3)
-  YYObj_Parameter(
+  let _sub_action_0_result = yy_action_14(_last_pos, _args[0:0])
+  let _sub_action_1_result = yy_action_33(_last_pos, _args[0:2])
+  guard _args[4].0 is YYObj_Option_Type_(_dollar5)
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _sub_action_1_result is YYObj_Visibility(_dollar2)
+  guard _args[3].0 is YYObj_Name(_dollar4)
+  YYObj_TypeSig(
     {
       ()
-      Labelled(_dollar1, _dollar3)
+      let exception_decl : @syntax.ExceptionDecl = match _dollar5 {
+        None => NoPayload
+        Some(ty) => SinglePayload(ty)
+      }
+      TypeSig::{
+        attrs: _dollar1,
+        vis: _dollar2,
+        name: _dollar4,
+        type_params: @list.empty(),
+        components: Error(exception_decl),
+      }
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 302|    label "?" ":" type_ { OptionalOption($1, $4) }
+// 202|    attributes vis "suberror" uident "{" separated_list(";", enum_constructor) "}" {
+// 203|    TypeSig::{attrs : $1, vis: $2, name: $4, type_params: @list.empty(), components: Error(EnumPayload($6))}
+// 204|  }
 
 ///|
-fn yy_action_36(
+fn yy_action_38(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[0].0 is YYObj_Label(_dollar1)
-  guard _args[3].0 is YYObj_Type(_dollar4)
-  YYObj_Parameter(
+  let _sub_action_0_result = yy_action_14(_last_pos, _args[0:0])
+  let _sub_action_1_result = yy_action_33(_last_pos, _args[0:2])
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _sub_action_1_result is YYObj_Visibility(_dollar2)
+  guard _args[3].0 is YYObj_Name(_dollar4)
+  guard _args[5].0 is YYObj__list_List_ConstrDecl_(_dollar6)
+  YYObj_TypeSig(
     {
       ()
-      OptionalOption(_dollar1, _dollar4)
+      TypeSig::{
+        attrs: _dollar1,
+        vis: _dollar2,
+        name: _dollar4,
+        type_params: @list.empty(),
+        components: Error(EnumPayload(_dollar6)),
+      }
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 366|    LIDENT { Label::{name: $1, loc: mk_loc($sloc)} }
-
-///|
-fn yy_action_37(
-  _last_pos : @basic.Position,
-  _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
-) -> YYObj {
-  guard _args[0].0 is YYObj_String(_dollar1)
-  let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
-  let _end_pos = if _args.length() == 0 {
-    _last_pos
-  } else {
-    _args[_args.length() - 1].2
-  }
-  YYObj_Label(
-    {
-      ()
-      Label::{ name: _dollar1, loc: mk_loc((_symbol_start_pos, _end_pos)) }
-    },
-  )
-}
-
-// file:///./stdlib.mbty
-// 60|    X SEP separated_nonempty_list(SEP, X) { $3.add($1) }
+// 205|    attributes vis "struct" type_decl_name_with_params "{" record_decl_body "}" {
+// 206|    TypeSig::{attrs : $1, vis: $2, name: $4.0, type_params: $4.1, components: $6 }
+// 207|  }
 
 ///|
-fn yy_action_38(
+fn yy_action_39(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[2].0 is YYObj__list_List_Parameter_(_dollar3)
-  guard _args[0].0 is YYObj_Parameter(_dollar1)
-  YYObj__list_List_Parameter_(
+  let _sub_action_0_result = yy_action_14(_last_pos, _args[0:0])
+  let _sub_action_1_result = yy_action_33(_last_pos, _args[0:2])
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _sub_action_1_result is YYObj_Visibility(_dollar2)
+  guard _args[3].0 is YYObj__Name___list_List_TypeParamNoConstraints__(_dollar4)
+  guard _args[5].0 is YYObj_TypeDefinition(_dollar6)
+  YYObj_TypeSig(
     {
       ()
-      _dollar3.add(_dollar1)
+      TypeSig::{
+        attrs: _dollar1,
+        vis: _dollar2,
+        name: _dollar4.0,
+        type_params: _dollar4.1,
+        components: _dollar6,
+      }
     },
   )
 }
 
-// file:///./stdlib.mbty
-// 59|    X { @list.singleton($1) }
+// file:///./mbti_parser.mbty
+// 208|    attributes vis "struct" type_decl_name_with_params "(" separated_list(",", type_) ")" {
+// 209|    TypeSig::{attrs : $1, vis: $2, name: $4.0, type_params: $4.1, components: TupleStruct($6)}
+// 210|  }
 
 ///|
-fn yy_action_39(
+fn yy_action_40(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[0].0 is YYObj_Parameter(_dollar1)
-  YYObj__list_List_Parameter_(
+  let _sub_action_0_result = yy_action_14(_last_pos, _args[0:0])
+  let _sub_action_1_result = yy_action_33(_last_pos, _args[0:2])
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _sub_action_1_result is YYObj_Visibility(_dollar2)
+  guard _args[3].0 is YYObj__Name___list_List_TypeParamNoConstraints__(_dollar4)
+  guard _args[5].0 is YYObj__list_List_Type_(_dollar6)
+  YYObj_TypeSig(
     {
       ()
-      @list.singleton(_dollar1)
+      TypeSig::{
+        attrs: _dollar1,
+        vis: _dollar2,
+        name: _dollar4.0,
+        type_params: _dollar4.1,
+        components: TupleStruct(_dollar6),
+      }
     },
   )
 }
 
-// file:///./stdlib.mbty
-// 54|    { @list.empty() }
+// file:///./mbti_parser.mbty
+// 211|    attributes vis "enum" type_decl_name_with_params "{" separated_list(";", enum_constructor) "}" {
+// 212|    TypeSig::{attrs : $1, vis: $2, name: $4.0, type_params: $4.1, components: Variant($6)}
+// 213|  }
 
 ///|
-fn yy_action_40(
+fn yy_action_41(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  YYObj__list_List_Parameter_(
+  let _sub_action_0_result = yy_action_14(_last_pos, _args[0:0])
+  let _sub_action_1_result = yy_action_33(_last_pos, _args[0:2])
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _sub_action_1_result is YYObj_Visibility(_dollar2)
+  guard _args[3].0 is YYObj__Name___list_List_TypeParamNoConstraints__(_dollar4)
+  guard _args[5].0 is YYObj__list_List_ConstrDecl_(_dollar6)
+  YYObj_TypeSig(
     {
       ()
-      @list.empty()
+      TypeSig::{
+        attrs: _dollar1,
+        vis: _dollar2,
+        name: _dollar4.0,
+        type_params: _dollar4.1,
+        components: Variant(_dollar6),
+      }
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 160|    { None }
+// 217|    attributes vis "impl" type_params_with_constraints qualified_uident "for" type_ {
+// 218|    ImplSig::{type_params : $4, trait_name : $5, type_ : $7, attrs : $1}
+// 219|  }
 
 ///|
-fn yy_action_41(
+fn yy_action_42(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  YYObj_Option_Name_(
+  let _sub_action_0_result = yy_action_14(_last_pos, _args[0:0])
+  let _sub_action_1_result = yy_action_33(_last_pos, _args[0:2])
+  guard _args[3].0 is YYObj__list_List_TypeParamWithConstraints_(_dollar4)
+  guard _args[4].0 is YYObj_QualifiedName(_dollar5)
+  guard _args[6].0 is YYObj_Type(_dollar7)
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  YYObj_ImplSig(
     {
       ()
-      None
+      ImplSig::{
+        type_params: _dollar4,
+        trait_name: _dollar5,
+        type_: _dollar7,
+        attrs: _dollar1,
+      }
     },
   )
 }
 
-// file:///./stdlib.mbty
-// 15|    X { $1 }
+// file:///./mbti_parser.mbty
+// 220|    attributes vis "impl" qualified_uident "for" type_ { 
+// 221|    ImplSig::{type_params : @list.empty(), trait_name : $4, type_ : $6, attrs : $1}
+// 222|  }
 
 ///|
-fn yy_action_42(
+fn yy_action_43(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[0].0 is YYObj__list_List_TypeParamWithConstraints_(_dollar1)
-  YYObj__list_List_TypeParamWithConstraints_(
+  let _sub_action_0_result = yy_action_14(_last_pos, _args[0:0])
+  let _sub_action_1_result = yy_action_33(_last_pos, _args[0:2])
+  guard _args[3].0 is YYObj_QualifiedName(_dollar4)
+  guard _args[5].0 is YYObj_Type(_dollar6)
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  YYObj_ImplSig(
     {
       ()
-      _dollar1
+      ImplSig::{
+        type_params: @list.empty(),
+        trait_name: _dollar4,
+        type_: _dollar6,
+        attrs: _dollar1,
+      }
     },
   )
 }
 
-// file:///./stdlib.mbty
-// 14|    { @list.empty() }
+// file:///./mbti_parser.mbty
+// 226|    attributes vis "trait" uident loption(preceded(":", separated_nonempty_list("+", qualified_uident))) "{" separated_nonempty_list(";", trait_method_sig) "}" { 
+// 227|    TraitSig::{ attrs : $1, vis: $2, name: $4, super_traits: $5, methods: $7} 
+// 228|  }
 
 ///|
-fn yy_action_43(
+fn yy_action_44(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  YYObj__list_List_TypeParamWithConstraints_(
+  let _sub_action_0_result = yy_action_14(_last_pos, _args[0:0])
+  let _sub_action_1_result = yy_action_33(_last_pos, _args[0:2])
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _sub_action_1_result is YYObj_Visibility(_dollar2)
+  guard _args[3].0 is YYObj_Name(_dollar4)
+  guard _args[4].0 is YYObj__list_List_QualifiedName_(_dollar5)
+  guard _args[6].0 is YYObj__list_List_TraitMethodSig_(_dollar7)
+  YYObj_TraitSig(
     {
       ()
-      @list.empty()
+      TraitSig::{
+        attrs: _dollar1,
+        vis: _dollar2,
+        name: _dollar4,
+        super_traits: _dollar5,
+        methods: _dollar7,
+      }
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 170|    nonempty_list(ATTRIBUTE) func_sig_no_attr { { ..$2, attr : $1 } }
+// 229|    attributes vis "trait" uident {
+// 230|    TraitSig::{ attrs : $1, vis: $2, name: $4, super_traits: @list.empty(), methods: @list.empty() } 
+// 231|  }
 
 ///|
-fn yy_action_44(
+fn yy_action_45(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[1].0 is YYObj_FuncSig(_dollar2)
-  guard _args[0].0
-    is YYObj__list_List__String__Option_String___String__(_dollar1)
-  YYObj_FuncSig(
+  let _sub_action_0_result = yy_action_14(_last_pos, _args[0:0])
+  let _sub_action_1_result = yy_action_33(_last_pos, _args[0:2])
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _sub_action_1_result is YYObj_Visibility(_dollar2)
+  guard _args[3].0 is YYObj_Name(_dollar4)
+  YYObj_TraitSig(
     {
       ()
-      { .._dollar2, attr: _dollar1 }
+      TraitSig::{
+        attrs: _dollar1,
+        vis: _dollar2,
+        name: _dollar4,
+        super_traits: @list.empty(),
+        methods: @list.empty(),
+      }
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 182|    vis "extern" "type" type_decl_name_with_params { TypeSig::{vis: $1, name: $4.0, type_params: $4.1, components: Extern} }
+// 245|    attributes vis "using" PACKAGE_NAME "{" "type" uident using_binder "}" {
+// 246|    let pkg = Name::{ name : $4, loc : mk_loc($loc($4)) }
+// 247|    Using(pkg~, target = $7, name = $8, kind = Type, attrs = $1)
+// 248|  }
 
 ///|
-fn yy_action_45(
+fn yy_action_46(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_46(_last_pos, _args[0:0])
-  guard _sub_action_0_result is YYObj_Visibility(_dollar1)
-  guard _args[2].0 is YYObj__Name___list_List_TypeParamNoConstraints__(_dollar4)
-  YYObj_TypeSig(
+  let _sub_action_0_result = yy_action_14(_last_pos, _args[0:0])
+  let _sub_action_1_result = yy_action_33(_last_pos, _args[0:2])
+  guard _args[3].0 is YYObj_String(_dollar4)
+  let _start_pos_of_item3 = _args[3].1
+  let _end_pos_of_item3 = _args[3].2
+  guard _args[6].0 is YYObj_Name(_dollar7)
+  guard _args[7].0 is YYObj_Name_(_dollar8)
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  YYObj_AliasSig(
     {
       ()
-      TypeSig::{
-        vis: _dollar1,
-        name: _dollar4.0,
-        type_params: _dollar4.1,
-        components: Extern,
+      let pkg = Name::{
+        name: _dollar4,
+        loc: mk_loc((_start_pos_of_item3, _end_pos_of_item3)),
       }
+      Using(pkg~, target=_dollar7, name=_dollar8, kind=Type, attrs=_dollar1)
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 182|    vis "extern" "type" type_decl_name_with_params { TypeSig::{vis: $1, name: $4.0, type_params: $4.1, components: Extern} }
+// 249|    attributes vis "using" PACKAGE_NAME "{" "trait" uident using_binder "}" {
+// 250|    let pkg = Name::{ name : $4, loc : mk_loc($loc($4)) }
+// 251|    Using(pkg~, target = $7, name = $8, kind = Trait, attrs = $1)
+// 252|  }
 
 ///|
 fn yy_action_47(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_48(_last_pos, _args[0:1])
-  guard _sub_action_0_result is YYObj_Visibility(_dollar1)
-  guard _args[3].0 is YYObj__Name___list_List_TypeParamNoConstraints__(_dollar4)
-  YYObj_TypeSig(
+  let _sub_action_0_result = yy_action_14(_last_pos, _args[0:0])
+  let _sub_action_1_result = yy_action_33(_last_pos, _args[0:2])
+  guard _args[3].0 is YYObj_String(_dollar4)
+  let _start_pos_of_item3 = _args[3].1
+  let _end_pos_of_item3 = _args[3].2
+  guard _args[6].0 is YYObj_Name(_dollar7)
+  guard _args[7].0 is YYObj_Name_(_dollar8)
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  YYObj_AliasSig(
     {
       ()
-      TypeSig::{
-        vis: _dollar1,
-        name: _dollar4.0,
-        type_params: _dollar4.1,
-        components: Extern,
+      let pkg = Name::{
+        name: _dollar4,
+        loc: mk_loc((_start_pos_of_item3, _end_pos_of_item3)),
       }
+      Using(pkg~, target=_dollar7, name=_dollar8, kind=Trait, attrs=_dollar1)
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 184|    vis "type" type_decl_name_with_params type_ { TypeSig::{vis: $1, name: $3.0, type_params: $3.1, components: Newtype($4)} }
+// 154|    attributes vis "const" uident ":" type_ "=" constant { ConstSig::{name: $4, type_: $6, value: $8, attrs: $1} }
 
 ///|
-fn yy_action_49(
+fn yy_action_48(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_48(_last_pos, _args[0:1])
-  guard _sub_action_0_result is YYObj_Visibility(_dollar1)
-  guard _args[2].0 is YYObj__Name___list_List_TypeParamNoConstraints__(_dollar3)
-  guard _args[3].0 is YYObj_Type(_dollar4)
-  YYObj_TypeSig(
+  let _sub_action_0_result = yy_action_49(_last_pos, _args[0:1])
+  let _sub_action_1_result = yy_action_15(_args[0].2, _args[1:1])
+  guard _args[2].0 is YYObj_Name(_dollar4)
+  guard _args[4].0 is YYObj_Type(_dollar6)
+  guard _args[6].0 is YYObj_Constant(_dollar8)
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  YYObj_ConstSig(
     {
       ()
-      TypeSig::{
-        vis: _dollar1,
-        name: _dollar3.0,
-        type_params: _dollar3.1,
-        components: Newtype(_dollar4),
+      ConstSig::{
+        name: _dollar4,
+        type_: _dollar6,
+        value: _dollar8,
+        attrs: _dollar1,
       }
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 183|    vis "type" type_decl_name_with_params { TypeSig::{vis: $1, name: $3.0, type_params: $3.1, components: Abstract} }
+// 154|    attributes vis "const" uident ":" type_ "=" constant { ConstSig::{name: $4, type_: $6, value: $8, attrs: $1} }
 
 ///|
 fn yy_action_50(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_48(_last_pos, _args[0:1])
-  guard _sub_action_0_result is YYObj_Visibility(_dollar1)
-  guard _args[2].0 is YYObj__Name___list_List_TypeParamNoConstraints__(_dollar3)
-  YYObj_TypeSig(
+  let _sub_action_0_result = yy_action_49(_last_pos, _args[0:1])
+  let _sub_action_1_result = yy_action_17(_args[0].2, _args[1:2])
+  guard _args[3].0 is YYObj_Name(_dollar4)
+  guard _args[5].0 is YYObj_Type(_dollar6)
+  guard _args[7].0 is YYObj_Constant(_dollar8)
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  YYObj_ConstSig(
     {
       ()
-      TypeSig::{
-        vis: _dollar1,
-        name: _dollar3.0,
-        type_params: _dollar3.1,
-        components: Abstract,
+      ConstSig::{
+        name: _dollar4,
+        type_: _dollar6,
+        value: _dollar8,
+        attrs: _dollar1,
       }
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 186|    vis "suberror" uident type_ { TypeSig::{vis: $1, name: $3, type_params: @list.empty(), components: Error(SinglePayload($4))} }
+// 158|    attributes vis "let" lident ":" type_ { ValueSig::{ attrs: $1, name: $4, type_: $6 } }
 
 ///|
 fn yy_action_51(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_48(_last_pos, _args[0:1])
-  guard _sub_action_0_result is YYObj_Visibility(_dollar1)
-  guard _args[2].0 is YYObj_Name(_dollar3)
-  guard _args[3].0 is YYObj_Type(_dollar4)
-  YYObj_TypeSig(
+  let _sub_action_0_result = yy_action_49(_last_pos, _args[0:1])
+  let _sub_action_1_result = yy_action_17(_args[0].2, _args[1:2])
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _args[3].0 is YYObj_Name(_dollar4)
+  guard _args[5].0 is YYObj_Type(_dollar6)
+  YYObj_ValueSig(
     {
       ()
-      TypeSig::{
-        vis: _dollar1,
-        name: _dollar3,
-        type_params: @list.empty(),
-        components: Error(SinglePayload(_dollar4)),
-      }
+      ValueSig::{ attrs: _dollar1, name: _dollar4, type_: _dollar6 }
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 187|    vis "suberror" uident "{" separated_list(";", enum_constructor) "}" { TypeSig::{vis: $1, name: $3, type_params: @list.empty(), components: Error(EnumPayload($5))} }
+// 239|    attributes vis "type"  type_decl_name_with_params "=" type_ {
+// 240|    TypeAlias(attrs = $1, vis=$2, name=$4.0, type_params=$4.1, type_=$6) 
+// 241|  }
 
 ///|
 fn yy_action_52(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_48(_last_pos, _args[0:1])
-  guard _sub_action_0_result is YYObj_Visibility(_dollar1)
-  guard _args[2].0 is YYObj_Name(_dollar3)
-  guard _args[4].0 is YYObj__list_List_ConstrDecl_(_dollar5)
-  YYObj_TypeSig(
+  let _sub_action_0_result = yy_action_49(_last_pos, _args[0:1])
+  let _sub_action_1_result = yy_action_17(_args[0].2, _args[1:2])
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _sub_action_1_result is YYObj_Visibility(_dollar2)
+  guard _args[3].0 is YYObj__Name___list_List_TypeParamNoConstraints__(_dollar4)
+  guard _args[5].0 is YYObj_Type(_dollar6)
+  YYObj_AliasSig(
     {
       ()
-      TypeSig::{
-        vis: _dollar1,
-        name: _dollar3,
-        type_params: @list.empty(),
-        components: Error(EnumPayload(_dollar5)),
-      }
+      TypeAlias(
+        attrs=_dollar1,
+        vis=_dollar2,
+        name=_dollar4.0,
+        type_params=_dollar4.1,
+        type_=_dollar6,
+      )
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 185|    vis "suberror" uident { TypeSig::{vis: $1, name: $3, type_params: @list.empty(), components: Error(NoPayload)} }
+// 192|    attributes vis "type" type_decl_name_with_params {
+// 193|    TypeSig::{attrs : $1, vis: $2, name: $4.0, type_params: $4.1, components: Abstract} 
+// 194|  }
 
 ///|
 fn yy_action_53(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_48(_last_pos, _args[0:1])
-  guard _sub_action_0_result is YYObj_Visibility(_dollar1)
-  guard _args[2].0 is YYObj_Name(_dollar3)
+  let _sub_action_0_result = yy_action_49(_last_pos, _args[0:1])
+  let _sub_action_1_result = yy_action_17(_args[0].2, _args[1:2])
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _sub_action_1_result is YYObj_Visibility(_dollar2)
+  guard _args[3].0 is YYObj__Name___list_List_TypeParamNoConstraints__(_dollar4)
   YYObj_TypeSig(
     {
       ()
       TypeSig::{
-        vis: _dollar1,
-        name: _dollar3,
-        type_params: @list.empty(),
-        components: Error(NoPayload),
+        attrs: _dollar1,
+        vis: _dollar2,
+        name: _dollar4.0,
+        type_params: _dollar4.1,
+        components: Abstract,
       }
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 188|    vis "struct" type_decl_name_with_params "{" separated_list(";", record_decl_field) "}" { TypeSig::{vis: $1, name: $3.0, type_params: $3.1, components: Record($5)} }
+// 195|    attributes vis "suberror" uident option(type_) {
+// 196|    let exception_decl : @syntax.ExceptionDecl = match $5 {
+// 197|      None => NoPayload
+// 198|      Some(ty) => SinglePayload(ty)
+// 199|    }
+// 200|    TypeSig::{attrs : $1, vis: $2, name: $4, type_params: @list.empty(), components: Error(exception_decl)}
+// 201|  }
 
 ///|
 fn yy_action_54(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_48(_last_pos, _args[0:1])
-  guard _sub_action_0_result is YYObj_Visibility(_dollar1)
-  guard _args[2].0 is YYObj__Name___list_List_TypeParamNoConstraints__(_dollar3)
-  guard _args[4].0 is YYObj__list_List_FieldDecl_(_dollar5)
+  let _sub_action_0_result = yy_action_49(_last_pos, _args[0:1])
+  let _sub_action_1_result = yy_action_17(_args[0].2, _args[1:2])
+  guard _args[4].0 is YYObj_Option_Type_(_dollar5)
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _sub_action_1_result is YYObj_Visibility(_dollar2)
+  guard _args[3].0 is YYObj_Name(_dollar4)
   YYObj_TypeSig(
     {
       ()
+      let exception_decl : @syntax.ExceptionDecl = match _dollar5 {
+        None => NoPayload
+        Some(ty) => SinglePayload(ty)
+      }
       TypeSig::{
-        vis: _dollar1,
-        name: _dollar3.0,
-        type_params: _dollar3.1,
-        components: Record(_dollar5),
+        attrs: _dollar1,
+        vis: _dollar2,
+        name: _dollar4,
+        type_params: @list.empty(),
+        components: Error(exception_decl),
       }
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 189|    vis "struct" type_decl_name_with_params "(" separated_list(",", type_) ")" { TypeSig::{vis: $1, name: $3.0, type_params: $3.1, components: TupleStruct($5)} }
+// 202|    attributes vis "suberror" uident "{" separated_list(";", enum_constructor) "}" {
+// 203|    TypeSig::{attrs : $1, vis: $2, name: $4, type_params: @list.empty(), components: Error(EnumPayload($6))}
+// 204|  }
 
 ///|
 fn yy_action_55(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_48(_last_pos, _args[0:1])
-  guard _sub_action_0_result is YYObj_Visibility(_dollar1)
-  guard _args[2].0 is YYObj__Name___list_List_TypeParamNoConstraints__(_dollar3)
-  guard _args[4].0 is YYObj__list_List_Type_(_dollar5)
+  let _sub_action_0_result = yy_action_49(_last_pos, _args[0:1])
+  let _sub_action_1_result = yy_action_17(_args[0].2, _args[1:2])
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _sub_action_1_result is YYObj_Visibility(_dollar2)
+  guard _args[3].0 is YYObj_Name(_dollar4)
+  guard _args[5].0 is YYObj__list_List_ConstrDecl_(_dollar6)
   YYObj_TypeSig(
     {
       ()
       TypeSig::{
-        vis: _dollar1,
-        name: _dollar3.0,
-        type_params: _dollar3.1,
-        components: TupleStruct(_dollar5),
+        attrs: _dollar1,
+        vis: _dollar2,
+        name: _dollar4,
+        type_params: @list.empty(),
+        components: Error(EnumPayload(_dollar6)),
       }
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 190|    vis "enum" type_decl_name_with_params "{" separated_list(";", enum_constructor) "}" { TypeSig::{vis: $1, name: $3.0, type_params: $3.1, components: Variant($5)} }
+// 205|    attributes vis "struct" type_decl_name_with_params "{" record_decl_body "}" {
+// 206|    TypeSig::{attrs : $1, vis: $2, name: $4.0, type_params: $4.1, components: $6 }
+// 207|  }
 
 ///|
 fn yy_action_56(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_48(_last_pos, _args[0:1])
-  guard _sub_action_0_result is YYObj_Visibility(_dollar1)
-  guard _args[2].0 is YYObj__Name___list_List_TypeParamNoConstraints__(_dollar3)
-  guard _args[4].0 is YYObj__list_List_ConstrDecl_(_dollar5)
+  let _sub_action_0_result = yy_action_49(_last_pos, _args[0:1])
+  let _sub_action_1_result = yy_action_17(_args[0].2, _args[1:2])
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _sub_action_1_result is YYObj_Visibility(_dollar2)
+  guard _args[3].0 is YYObj__Name___list_List_TypeParamNoConstraints__(_dollar4)
+  guard _args[5].0 is YYObj_TypeDefinition(_dollar6)
   YYObj_TypeSig(
     {
       ()
       TypeSig::{
-        vis: _dollar1,
-        name: _dollar3.0,
-        type_params: _dollar3.1,
-        components: Variant(_dollar5),
+        attrs: _dollar1,
+        vis: _dollar2,
+        name: _dollar4.0,
+        type_params: _dollar4.1,
+        components: _dollar6,
       }
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 200|    vis "trait" uident loption(preceded(":", separated_nonempty_list("+", qualified_uident))) "{" separated_nonempty_list(";", trait_method_sig) "}" { TraitSig::{vis: $1, name: $3, super_traits: $4, methods: $6} }
+// 208|    attributes vis "struct" type_decl_name_with_params "(" separated_list(",", type_) ")" {
+// 209|    TypeSig::{attrs : $1, vis: $2, name: $4.0, type_params: $4.1, components: TupleStruct($6)}
+// 210|  }
 
 ///|
 fn yy_action_57(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_48(_last_pos, _args[0:1])
-  guard _sub_action_0_result is YYObj_Visibility(_dollar1)
-  guard _args[2].0 is YYObj_Name(_dollar3)
-  guard _args[3].0 is YYObj__list_List_QualifiedName_(_dollar4)
-  guard _args[5].0 is YYObj__list_List_TraitMethodSig_(_dollar6)
-  YYObj_TraitSig(
+  let _sub_action_0_result = yy_action_49(_last_pos, _args[0:1])
+  let _sub_action_1_result = yy_action_17(_args[0].2, _args[1:2])
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _sub_action_1_result is YYObj_Visibility(_dollar2)
+  guard _args[3].0 is YYObj__Name___list_List_TypeParamNoConstraints__(_dollar4)
+  guard _args[5].0 is YYObj__list_List_Type_(_dollar6)
+  YYObj_TypeSig(
     {
       ()
-      TraitSig::{
-        vis: _dollar1,
-        name: _dollar3,
-        super_traits: _dollar4,
-        methods: _dollar6,
+      TypeSig::{
+        attrs: _dollar1,
+        vis: _dollar2,
+        name: _dollar4.0,
+        type_params: _dollar4.1,
+        components: TupleStruct(_dollar6),
       }
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 201|    vis "trait" uident { TraitSig::{vis: $1, name: $3, super_traits: @list.empty(), methods: @list.empty()} }
+// 211|    attributes vis "enum" type_decl_name_with_params "{" separated_list(";", enum_constructor) "}" {
+// 212|    TypeSig::{attrs : $1, vis: $2, name: $4.0, type_params: $4.1, components: Variant($6)}
+// 213|  }
 
 ///|
 fn yy_action_58(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_48(_last_pos, _args[0:1])
-  guard _sub_action_0_result is YYObj_Visibility(_dollar1)
-  guard _args[2].0 is YYObj_Name(_dollar3)
-  YYObj_TraitSig(
+  let _sub_action_0_result = yy_action_49(_last_pos, _args[0:1])
+  let _sub_action_1_result = yy_action_17(_args[0].2, _args[1:2])
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _sub_action_1_result is YYObj_Visibility(_dollar2)
+  guard _args[3].0 is YYObj__Name___list_List_TypeParamNoConstraints__(_dollar4)
+  guard _args[5].0 is YYObj__list_List_ConstrDecl_(_dollar6)
+  YYObj_TypeSig(
     {
       ()
-      TraitSig::{
-        vis: _dollar1,
-        name: _dollar3,
-        super_traits: @list.empty(),
-        methods: @list.empty(),
+      TypeSig::{
+        attrs: _dollar1,
+        vis: _dollar2,
+        name: _dollar4.0,
+        type_params: _dollar4.1,
+        components: Variant(_dollar6),
       }
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 205|    vis "typealias" type_ "as" type_decl_name_with_params  { TypeAlias(vis=$1, name=$5.0, type_params=$5.1, type_=$3) }
+// 217|    attributes vis "impl" type_params_with_constraints qualified_uident "for" type_ {
+// 218|    ImplSig::{type_params : $4, trait_name : $5, type_ : $7, attrs : $1}
+// 219|  }
 
 ///|
 fn yy_action_59(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_48(_last_pos, _args[0:1])
-  guard _sub_action_0_result is YYObj_Visibility(_dollar1)
-  guard _args[4].0 is YYObj__Name___list_List_TypeParamNoConstraints__(_dollar5)
-  guard _args[2].0 is YYObj_Type(_dollar3)
-  YYObj_AliasSig(
+  let _sub_action_0_result = yy_action_49(_last_pos, _args[0:1])
+  let _sub_action_1_result = yy_action_17(_args[0].2, _args[1:2])
+  guard _args[3].0 is YYObj__list_List_TypeParamWithConstraints_(_dollar4)
+  guard _args[4].0 is YYObj_QualifiedName(_dollar5)
+  guard _args[6].0 is YYObj_Type(_dollar7)
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  YYObj_ImplSig(
     {
       ()
-      TypeAlias(
-        vis=_dollar1,
-        name=_dollar5.0,
-        type_params=_dollar5.1,
-        type_=_dollar3,
-      )
+      ImplSig::{
+        type_params: _dollar4,
+        trait_name: _dollar5,
+        type_: _dollar7,
+        attrs: _dollar1,
+      }
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 206|    vis "traitalias" qualified_uident "as" uident { TraitAlias(vis=$1, name=$5, trait_name=$3) }
+// 220|    attributes vis "impl" qualified_uident "for" type_ { 
+// 221|    ImplSig::{type_params : @list.empty(), trait_name : $4, type_ : $6, attrs : $1}
+// 222|  }
 
 ///|
 fn yy_action_60(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_48(_last_pos, _args[0:1])
-  guard _sub_action_0_result is YYObj_Visibility(_dollar1)
-  guard _args[4].0 is YYObj_Name(_dollar5)
-  guard _args[2].0 is YYObj_QualifiedName(_dollar3)
-  YYObj_AliasSig(
+  let _sub_action_0_result = yy_action_49(_last_pos, _args[0:1])
+  let _sub_action_1_result = yy_action_17(_args[0].2, _args[1:2])
+  guard _args[3].0 is YYObj_QualifiedName(_dollar4)
+  guard _args[5].0 is YYObj_Type(_dollar6)
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  YYObj_ImplSig(
     {
       ()
-      TraitAlias(vis=_dollar1, name=_dollar5, trait_name=_dollar3)
-    },
-  )
+      ImplSig::{
+        type_params: @list.empty(),
+        trait_name: _dollar4,
+        type_: _dollar6,
+        attrs: _dollar1,
+      }
+    },
+  )
 }
 
 // file:///./mbti_parser.mbty
-// 332|    "priv" { Priv(loc=mk_loc($sloc)) }
+// 226|    attributes vis "trait" uident loption(preceded(":", separated_nonempty_list("+", qualified_uident))) "{" separated_nonempty_list(";", trait_method_sig) "}" { 
+// 227|    TraitSig::{ attrs : $1, vis: $2, name: $4, super_traits: $5, methods: $7} 
+// 228|  }
 
 ///|
-fn yy_action_48(
+fn yy_action_61(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
-  let _end_pos = if _args.length() == 0 {
-    _last_pos
-  } else {
-    _args[_args.length() - 1].2
-  }
-  YYObj_Visibility(
+  let _sub_action_0_result = yy_action_49(_last_pos, _args[0:1])
+  let _sub_action_1_result = yy_action_17(_args[0].2, _args[1:2])
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _sub_action_1_result is YYObj_Visibility(_dollar2)
+  guard _args[3].0 is YYObj_Name(_dollar4)
+  guard _args[4].0 is YYObj__list_List_QualifiedName_(_dollar5)
+  guard _args[6].0 is YYObj__list_List_TraitMethodSig_(_dollar7)
+  YYObj_TraitSig(
     {
       ()
-      Priv(loc=mk_loc((_symbol_start_pos, _end_pos)))
+      TraitSig::{
+        attrs: _dollar1,
+        vis: _dollar2,
+        name: _dollar4,
+        super_traits: _dollar5,
+        methods: _dollar7,
+      }
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 182|    vis "extern" "type" type_decl_name_with_params { TypeSig::{vis: $1, name: $4.0, type_params: $4.1, components: Extern} }
+// 229|    attributes vis "trait" uident {
+// 230|    TraitSig::{ attrs : $1, vis: $2, name: $4, super_traits: @list.empty(), methods: @list.empty() } 
+// 231|  }
 
 ///|
-fn yy_action_61(
+fn yy_action_62(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_62(_last_pos, _args[0:2])
-  guard _sub_action_0_result is YYObj_Visibility(_dollar1)
-  guard _args[4].0 is YYObj__Name___list_List_TypeParamNoConstraints__(_dollar4)
-  YYObj_TypeSig(
+  let _sub_action_0_result = yy_action_49(_last_pos, _args[0:1])
+  let _sub_action_1_result = yy_action_17(_args[0].2, _args[1:2])
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _sub_action_1_result is YYObj_Visibility(_dollar2)
+  guard _args[3].0 is YYObj_Name(_dollar4)
+  YYObj_TraitSig(
     {
       ()
-      TypeSig::{
-        vis: _dollar1,
-        name: _dollar4.0,
-        type_params: _dollar4.1,
-        components: Extern,
+      TraitSig::{
+        attrs: _dollar1,
+        vis: _dollar2,
+        name: _dollar4,
+        super_traits: @list.empty(),
+        methods: @list.empty(),
       }
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 184|    vis "type" type_decl_name_with_params type_ { TypeSig::{vis: $1, name: $3.0, type_params: $3.1, components: Newtype($4)} }
+// 245|    attributes vis "using" PACKAGE_NAME "{" "type" uident using_binder "}" {
+// 246|    let pkg = Name::{ name : $4, loc : mk_loc($loc($4)) }
+// 247|    Using(pkg~, target = $7, name = $8, kind = Type, attrs = $1)
+// 248|  }
 
 ///|
 fn yy_action_63(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_62(_last_pos, _args[0:2])
-  guard _sub_action_0_result is YYObj_Visibility(_dollar1)
-  guard _args[3].0 is YYObj__Name___list_List_TypeParamNoConstraints__(_dollar3)
-  guard _args[4].0 is YYObj_Type(_dollar4)
-  YYObj_TypeSig(
+  let _sub_action_0_result = yy_action_49(_last_pos, _args[0:1])
+  let _sub_action_1_result = yy_action_17(_args[0].2, _args[1:2])
+  guard _args[3].0 is YYObj_String(_dollar4)
+  let _start_pos_of_item3 = _args[3].1
+  let _end_pos_of_item3 = _args[3].2
+  guard _args[6].0 is YYObj_Name(_dollar7)
+  guard _args[7].0 is YYObj_Name_(_dollar8)
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  YYObj_AliasSig(
     {
       ()
-      TypeSig::{
-        vis: _dollar1,
-        name: _dollar3.0,
-        type_params: _dollar3.1,
-        components: Newtype(_dollar4),
+      let pkg = Name::{
+        name: _dollar4,
+        loc: mk_loc((_start_pos_of_item3, _end_pos_of_item3)),
       }
+      Using(pkg~, target=_dollar7, name=_dollar8, kind=Type, attrs=_dollar1)
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 183|    vis "type" type_decl_name_with_params { TypeSig::{vis: $1, name: $3.0, type_params: $3.1, components: Abstract} }
+// 249|    attributes vis "using" PACKAGE_NAME "{" "trait" uident using_binder "}" {
+// 250|    let pkg = Name::{ name : $4, loc : mk_loc($loc($4)) }
+// 251|    Using(pkg~, target = $7, name = $8, kind = Trait, attrs = $1)
+// 252|  }
 
 ///|
 fn yy_action_64(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_62(_last_pos, _args[0:2])
-  guard _sub_action_0_result is YYObj_Visibility(_dollar1)
-  guard _args[3].0 is YYObj__Name___list_List_TypeParamNoConstraints__(_dollar3)
-  YYObj_TypeSig(
+  let _sub_action_0_result = yy_action_49(_last_pos, _args[0:1])
+  let _sub_action_1_result = yy_action_17(_args[0].2, _args[1:2])
+  guard _args[3].0 is YYObj_String(_dollar4)
+  let _start_pos_of_item3 = _args[3].1
+  let _end_pos_of_item3 = _args[3].2
+  guard _args[6].0 is YYObj_Name(_dollar7)
+  guard _args[7].0 is YYObj_Name_(_dollar8)
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  YYObj_AliasSig(
     {
       ()
-      TypeSig::{
-        vis: _dollar1,
-        name: _dollar3.0,
-        type_params: _dollar3.1,
-        components: Abstract,
+      let pkg = Name::{
+        name: _dollar4,
+        loc: mk_loc((_start_pos_of_item3, _end_pos_of_item3)),
       }
+      Using(pkg~, target=_dollar7, name=_dollar8, kind=Trait, attrs=_dollar1)
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 186|    vis "suberror" uident type_ { TypeSig::{vis: $1, name: $3, type_params: @list.empty(), components: Error(SinglePayload($4))} }
+// 401|    "priv" { Priv(loc=mk_loc($sloc)) }
 
 ///|
-fn yy_action_65(
+fn yy_action_17(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_62(_last_pos, _args[0:2])
-  guard _sub_action_0_result is YYObj_Visibility(_dollar1)
-  guard _args[3].0 is YYObj_Name(_dollar3)
-  guard _args[4].0 is YYObj_Type(_dollar4)
-  YYObj_TypeSig(
+  let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
+  let _end_pos = if _args.length() == 0 {
+    _last_pos
+  } else {
+    _args[_args.length() - 1].2
+  }
+  YYObj_Visibility(
     {
       ()
-      TypeSig::{
-        vis: _dollar1,
-        name: _dollar3,
-        type_params: @list.empty(),
-        components: Error(SinglePayload(_dollar4)),
-      }
+      Priv(loc=mk_loc((_symbol_start_pos, _end_pos)))
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 187|    vis "suberror" uident "{" separated_list(";", enum_constructor) "}" { TypeSig::{vis: $1, name: $3, type_params: @list.empty(), components: Error(EnumPayload($5))} }
+// 154|    attributes vis "const" uident ":" type_ "=" constant { ConstSig::{name: $4, type_: $6, value: $8, attrs: $1} }
 
 ///|
-fn yy_action_66(
+fn yy_action_65(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_62(_last_pos, _args[0:2])
-  guard _sub_action_0_result is YYObj_Visibility(_dollar1)
-  guard _args[3].0 is YYObj_Name(_dollar3)
-  guard _args[5].0 is YYObj__list_List_ConstrDecl_(_dollar5)
-  YYObj_TypeSig(
+  let _sub_action_0_result = yy_action_49(_last_pos, _args[0:1])
+  let _sub_action_1_result = yy_action_33(_args[0].2, _args[1:3])
+  guard _args[4].0 is YYObj_Name(_dollar4)
+  guard _args[6].0 is YYObj_Type(_dollar6)
+  guard _args[8].0 is YYObj_Constant(_dollar8)
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  YYObj_ConstSig(
     {
       ()
-      TypeSig::{
-        vis: _dollar1,
-        name: _dollar3,
-        type_params: @list.empty(),
-        components: Error(EnumPayload(_dollar5)),
+      ConstSig::{
+        name: _dollar4,
+        type_: _dollar6,
+        value: _dollar8,
+        attrs: _dollar1,
       }
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 185|    vis "suberror" uident { TypeSig::{vis: $1, name: $3, type_params: @list.empty(), components: Error(NoPayload)} }
+// 380|    TRUE { Bool(true) }
 
 ///|
-fn yy_action_67(
+fn yy_action_66(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_62(_last_pos, _args[0:2])
-  guard _sub_action_0_result is YYObj_Visibility(_dollar1)
-  guard _args[3].0 is YYObj_Name(_dollar3)
-  YYObj_TypeSig(
+  YYObj_Constant(
     {
       ()
-      TypeSig::{
-        vis: _dollar1,
-        name: _dollar3,
-        type_params: @list.empty(),
-        components: Error(NoPayload),
-      }
+      Bool(true)
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 188|    vis "struct" type_decl_name_with_params "{" separated_list(";", record_decl_field) "}" { TypeSig::{vis: $1, name: $3.0, type_params: $3.1, components: Record($5)} }
+// 381|    FALSE { Bool(false) }
 
 ///|
-fn yy_action_68(
+fn yy_action_67(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_62(_last_pos, _args[0:2])
-  guard _sub_action_0_result is YYObj_Visibility(_dollar1)
-  guard _args[3].0 is YYObj__Name___list_List_TypeParamNoConstraints__(_dollar3)
-  guard _args[5].0 is YYObj__list_List_FieldDecl_(_dollar5)
-  YYObj_TypeSig(
+  YYObj_Constant(
     {
       ()
-      TypeSig::{
-        vis: _dollar1,
-        name: _dollar3.0,
-        type_params: _dollar3.1,
-        components: Record(_dollar5),
-      }
+      Bool(false)
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 189|    vis "struct" type_decl_name_with_params "(" separated_list(",", type_) ")" { TypeSig::{vis: $1, name: $3.0, type_params: $3.1, components: TupleStruct($5)} }
+// 382|    BYTE { Byte($1) }
 
 ///|
-fn yy_action_69(
+fn yy_action_68(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_62(_last_pos, _args[0:2])
-  guard _sub_action_0_result is YYObj_Visibility(_dollar1)
-  guard _args[3].0 is YYObj__Name___list_List_TypeParamNoConstraints__(_dollar3)
-  guard _args[5].0 is YYObj__list_List_Type_(_dollar5)
-  YYObj_TypeSig(
+  guard _args[0].0 is YYObj_CharLiteral(_dollar1)
+  YYObj_Constant(
     {
       ()
-      TypeSig::{
-        vis: _dollar1,
-        name: _dollar3.0,
-        type_params: _dollar3.1,
-        components: TupleStruct(_dollar5),
-      }
+      Byte(_dollar1)
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 190|    vis "enum" type_decl_name_with_params "{" separated_list(";", enum_constructor) "}" { TypeSig::{vis: $1, name: $3.0, type_params: $3.1, components: Variant($5)} }
+// 383|    BYTES { Bytes($1) }
 
 ///|
-fn yy_action_70(
+fn yy_action_69(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_62(_last_pos, _args[0:2])
-  guard _sub_action_0_result is YYObj_Visibility(_dollar1)
-  guard _args[3].0 is YYObj__Name___list_List_TypeParamNoConstraints__(_dollar3)
-  guard _args[5].0 is YYObj__list_List_ConstrDecl_(_dollar5)
-  YYObj_TypeSig(
+  guard _args[0].0 is YYObj_StringLiteral(_dollar1)
+  YYObj_Constant(
     {
       ()
-      TypeSig::{
-        vis: _dollar1,
-        name: _dollar3.0,
-        type_params: _dollar3.1,
-        components: Variant(_dollar5),
-      }
+      Bytes(_dollar1)
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 200|    vis "trait" uident loption(preceded(":", separated_nonempty_list("+", qualified_uident))) "{" separated_nonempty_list(";", trait_method_sig) "}" { TraitSig::{vis: $1, name: $3, super_traits: $4, methods: $6} }
+// 384|    CHAR { Char($1) }
 
 ///|
-fn yy_action_71(
+fn yy_action_70(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_62(_last_pos, _args[0:2])
-  guard _sub_action_0_result is YYObj_Visibility(_dollar1)
-  guard _args[3].0 is YYObj_Name(_dollar3)
-  guard _args[4].0 is YYObj__list_List_QualifiedName_(_dollar4)
-  guard _args[6].0 is YYObj__list_List_TraitMethodSig_(_dollar6)
-  YYObj_TraitSig(
+  guard _args[0].0 is YYObj_CharLiteral(_dollar1)
+  YYObj_Constant(
     {
       ()
-      TraitSig::{
-        vis: _dollar1,
-        name: _dollar3,
-        super_traits: _dollar4,
-        methods: _dollar6,
-      }
+      Char(_dollar1)
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 201|    vis "trait" uident { TraitSig::{vis: $1, name: $3, super_traits: @list.empty(), methods: @list.empty()} }
+// 385|    INT {
+// 386|    match $1 {
+// 387|      [.. lit, .. "UL"] => UInt64(lit.to_string())
+// 388|      [.. lit, 'L'] => Int64(lit.to_string())
+// 389|      [.. lit, 'U'] => UInt(lit.to_string())
+// 390|      [.. lit, 'N'] => BigInt(lit.to_string())
+// 391|      lit => Int(lit)
+// 392|    }
+// 393|  }
 
 ///|
-fn yy_action_72(
+fn yy_action_71(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_62(_last_pos, _args[0:2])
-  guard _sub_action_0_result is YYObj_Visibility(_dollar1)
-  guard _args[3].0 is YYObj_Name(_dollar3)
-  YYObj_TraitSig(
+  guard _args[0].0 is YYObj_String(_dollar1)
+  YYObj_Constant(
     {
       ()
-      TraitSig::{
-        vis: _dollar1,
-        name: _dollar3,
-        super_traits: @list.empty(),
-        methods: @list.empty(),
+      match _dollar1 {
+        [.. lit, .. "UL"] => UInt64(lit.to_string())
+        [.. lit, 'L'] => Int64(lit.to_string())
+        [.. lit, 'U'] => UInt(lit.to_string())
+        [.. lit, 'N'] => BigInt(lit.to_string())
+        lit => Int(lit)
       }
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 205|    vis "typealias" type_ "as" type_decl_name_with_params  { TypeAlias(vis=$1, name=$5.0, type_params=$5.1, type_=$3) }
+// 394|    FLOAT { Float($1) }
 
 ///|
-fn yy_action_73(
+fn yy_action_72(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_62(_last_pos, _args[0:2])
-  guard _sub_action_0_result is YYObj_Visibility(_dollar1)
-  guard _args[5].0 is YYObj__Name___list_List_TypeParamNoConstraints__(_dollar5)
-  guard _args[3].0 is YYObj_Type(_dollar3)
-  YYObj_AliasSig(
+  guard _args[0].0 is YYObj_String(_dollar1)
+  YYObj_Constant(
     {
       ()
-      TypeAlias(
-        vis=_dollar1,
-        name=_dollar5.0,
-        type_params=_dollar5.1,
-        type_=_dollar3,
-      )
+      Float(_dollar1)
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 206|    vis "traitalias" qualified_uident "as" uident { TraitAlias(vis=$1, name=$5, trait_name=$3) }
+// 395|    DOUBLE { Double($1) }
 
 ///|
-fn yy_action_74(
+fn yy_action_73(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_62(_last_pos, _args[0:2])
-  guard _sub_action_0_result is YYObj_Visibility(_dollar1)
-  guard _args[5].0 is YYObj_Name(_dollar5)
-  guard _args[3].0 is YYObj_QualifiedName(_dollar3)
-  YYObj_AliasSig(
+  guard _args[0].0 is YYObj_String(_dollar1)
+  YYObj_Constant(
     {
       ()
-      TraitAlias(vis=_dollar1, name=_dollar5, trait_name=_dollar3)
+      Double(_dollar1)
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 333|    "pub" pub_attr { Pub(attr=$2, loc=mk_loc($sloc)) }
+// 396|    STRING { String($1) }
 
 ///|
-fn yy_action_62(
+fn yy_action_74(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[1].0 is YYObj_String_(_dollar2)
-  let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
-  let _end_pos = if _args.length() == 0 {
-    _last_pos
-  } else {
-    _args[_args.length() - 1].2
-  }
-  YYObj_Visibility(
+  guard _args[0].0 is YYObj_StringLiteral(_dollar1)
+  YYObj_Constant(
     {
       ()
-      Pub(attr=_dollar2, loc=mk_loc((_symbol_start_pos, _end_pos)))
+      String(_dollar1)
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 338|    "(" "readonly" ")" { Some("readonly") }
+// 158|    attributes vis "let" lident ":" type_ { ValueSig::{ attrs: $1, name: $4, type_: $6 } }
 
 ///|
 fn yy_action_75(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  YYObj_String_(
+  let _sub_action_0_result = yy_action_49(_last_pos, _args[0:1])
+  let _sub_action_1_result = yy_action_33(_args[0].2, _args[1:3])
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _args[4].0 is YYObj_Name(_dollar4)
+  guard _args[6].0 is YYObj_Type(_dollar6)
+  YYObj_ValueSig(
     {
       ()
-      Some("readonly")
+      ValueSig::{ attrs: _dollar1, name: _dollar4, type_: _dollar6 }
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 339|    "(" LIDENT ")" { Some($2) }
+// 239|    attributes vis "type"  type_decl_name_with_params "=" type_ {
+// 240|    TypeAlias(attrs = $1, vis=$2, name=$4.0, type_params=$4.1, type_=$6) 
+// 241|  }
 
 ///|
 fn yy_action_76(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[1].0 is YYObj_String(_dollar2)
-  YYObj_String_(
+  let _sub_action_0_result = yy_action_49(_last_pos, _args[0:1])
+  let _sub_action_1_result = yy_action_33(_args[0].2, _args[1:3])
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _sub_action_1_result is YYObj_Visibility(_dollar2)
+  guard _args[4].0 is YYObj__Name___list_List_TypeParamNoConstraints__(_dollar4)
+  guard _args[6].0 is YYObj_Type(_dollar6)
+  YYObj_AliasSig(
     {
       ()
-      Some(_dollar2)
+      TypeAlias(
+        attrs=_dollar1,
+        vis=_dollar2,
+        name=_dollar4.0,
+        type_params=_dollar4.1,
+        type_=_dollar6,
+      )
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 337|    { None }
+// 192|    attributes vis "type" type_decl_name_with_params {
+// 193|    TypeSig::{attrs : $1, vis: $2, name: $4.0, type_params: $4.1, components: Abstract} 
+// 194|  }
 
 ///|
 fn yy_action_77(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  YYObj_String_(
+  let _sub_action_0_result = yy_action_49(_last_pos, _args[0:1])
+  let _sub_action_1_result = yy_action_33(_args[0].2, _args[1:3])
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _sub_action_1_result is YYObj_Visibility(_dollar2)
+  guard _args[4].0 is YYObj__Name___list_List_TypeParamNoConstraints__(_dollar4)
+  YYObj_TypeSig(
     {
       ()
-      None
+      TypeSig::{
+        attrs: _dollar1,
+        vis: _dollar2,
+        name: _dollar4.0,
+        type_params: _dollar4.1,
+        components: Abstract,
+      }
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 184|    vis "type" type_decl_name_with_params type_ { TypeSig::{vis: $1, name: $3.0, type_params: $3.1, components: Newtype($4)} }
+// 195|    attributes vis "suberror" uident option(type_) {
+// 196|    let exception_decl : @syntax.ExceptionDecl = match $5 {
+// 197|      None => NoPayload
+// 198|      Some(ty) => SinglePayload(ty)
+// 199|    }
+// 200|    TypeSig::{attrs : $1, vis: $2, name: $4, type_params: @list.empty(), components: Error(exception_decl)}
+// 201|  }
 
 ///|
 fn yy_action_78(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_46(_last_pos, _args[0:0])
-  guard _sub_action_0_result is YYObj_Visibility(_dollar1)
-  guard _args[1].0 is YYObj__Name___list_List_TypeParamNoConstraints__(_dollar3)
-  guard _args[2].0 is YYObj_Type(_dollar4)
+  let _sub_action_0_result = yy_action_49(_last_pos, _args[0:1])
+  let _sub_action_1_result = yy_action_33(_args[0].2, _args[1:3])
+  guard _args[5].0 is YYObj_Option_Type_(_dollar5)
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _sub_action_1_result is YYObj_Visibility(_dollar2)
+  guard _args[4].0 is YYObj_Name(_dollar4)
   YYObj_TypeSig(
     {
       ()
+      let exception_decl : @syntax.ExceptionDecl = match _dollar5 {
+        None => NoPayload
+        Some(ty) => SinglePayload(ty)
+      }
       TypeSig::{
-        vis: _dollar1,
-        name: _dollar3.0,
-        type_params: _dollar3.1,
-        components: Newtype(_dollar4),
+        attrs: _dollar1,
+        vis: _dollar2,
+        name: _dollar4,
+        type_params: @list.empty(),
+        components: Error(exception_decl),
       }
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 183|    vis "type" type_decl_name_with_params { TypeSig::{vis: $1, name: $3.0, type_params: $3.1, components: Abstract} }
+// 202|    attributes vis "suberror" uident "{" separated_list(";", enum_constructor) "}" {
+// 203|    TypeSig::{attrs : $1, vis: $2, name: $4, type_params: @list.empty(), components: Error(EnumPayload($6))}
+// 204|  }
 
 ///|
 fn yy_action_79(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_46(_last_pos, _args[0:0])
-  guard _sub_action_0_result is YYObj_Visibility(_dollar1)
-  guard _args[1].0 is YYObj__Name___list_List_TypeParamNoConstraints__(_dollar3)
+  let _sub_action_0_result = yy_action_49(_last_pos, _args[0:1])
+  let _sub_action_1_result = yy_action_33(_args[0].2, _args[1:3])
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _sub_action_1_result is YYObj_Visibility(_dollar2)
+  guard _args[4].0 is YYObj_Name(_dollar4)
+  guard _args[6].0 is YYObj__list_List_ConstrDecl_(_dollar6)
   YYObj_TypeSig(
     {
       ()
       TypeSig::{
-        vis: _dollar1,
-        name: _dollar3.0,
-        type_params: _dollar3.1,
-        components: Abstract,
+        attrs: _dollar1,
+        vis: _dollar2,
+        name: _dollar4,
+        type_params: @list.empty(),
+        components: Error(EnumPayload(_dollar6)),
       }
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 186|    vis "suberror" uident type_ { TypeSig::{vis: $1, name: $3, type_params: @list.empty(), components: Error(SinglePayload($4))} }
+// 205|    attributes vis "struct" type_decl_name_with_params "{" record_decl_body "}" {
+// 206|    TypeSig::{attrs : $1, vis: $2, name: $4.0, type_params: $4.1, components: $6 }
+// 207|  }
 
 ///|
 fn yy_action_80(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_46(_last_pos, _args[0:0])
-  guard _sub_action_0_result is YYObj_Visibility(_dollar1)
-  guard _args[1].0 is YYObj_Name(_dollar3)
-  guard _args[2].0 is YYObj_Type(_dollar4)
+  let _sub_action_0_result = yy_action_49(_last_pos, _args[0:1])
+  let _sub_action_1_result = yy_action_33(_args[0].2, _args[1:3])
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _sub_action_1_result is YYObj_Visibility(_dollar2)
+  guard _args[4].0 is YYObj__Name___list_List_TypeParamNoConstraints__(_dollar4)
+  guard _args[6].0 is YYObj_TypeDefinition(_dollar6)
   YYObj_TypeSig(
     {
       ()
       TypeSig::{
-        vis: _dollar1,
-        name: _dollar3,
-        type_params: @list.empty(),
-        components: Error(SinglePayload(_dollar4)),
+        attrs: _dollar1,
+        vis: _dollar2,
+        name: _dollar4.0,
+        type_params: _dollar4.1,
+        components: _dollar6,
       }
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 187|    vis "suberror" uident "{" separated_list(";", enum_constructor) "}" { TypeSig::{vis: $1, name: $3, type_params: @list.empty(), components: Error(EnumPayload($5))} }
+// 208|    attributes vis "struct" type_decl_name_with_params "(" separated_list(",", type_) ")" {
+// 209|    TypeSig::{attrs : $1, vis: $2, name: $4.0, type_params: $4.1, components: TupleStruct($6)}
+// 210|  }
 
 ///|
 fn yy_action_81(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_46(_last_pos, _args[0:0])
-  guard _sub_action_0_result is YYObj_Visibility(_dollar1)
-  guard _args[1].0 is YYObj_Name(_dollar3)
-  guard _args[3].0 is YYObj__list_List_ConstrDecl_(_dollar5)
+  let _sub_action_0_result = yy_action_49(_last_pos, _args[0:1])
+  let _sub_action_1_result = yy_action_33(_args[0].2, _args[1:3])
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _sub_action_1_result is YYObj_Visibility(_dollar2)
+  guard _args[4].0 is YYObj__Name___list_List_TypeParamNoConstraints__(_dollar4)
+  guard _args[6].0 is YYObj__list_List_Type_(_dollar6)
   YYObj_TypeSig(
     {
       ()
       TypeSig::{
-        vis: _dollar1,
-        name: _dollar3,
-        type_params: @list.empty(),
-        components: Error(EnumPayload(_dollar5)),
+        attrs: _dollar1,
+        vis: _dollar2,
+        name: _dollar4.0,
+        type_params: _dollar4.1,
+        components: TupleStruct(_dollar6),
       }
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 185|    vis "suberror" uident { TypeSig::{vis: $1, name: $3, type_params: @list.empty(), components: Error(NoPayload)} }
+// 211|    attributes vis "enum" type_decl_name_with_params "{" separated_list(";", enum_constructor) "}" {
+// 212|    TypeSig::{attrs : $1, vis: $2, name: $4.0, type_params: $4.1, components: Variant($6)}
+// 213|  }
 
 ///|
 fn yy_action_82(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_46(_last_pos, _args[0:0])
-  guard _sub_action_0_result is YYObj_Visibility(_dollar1)
-  guard _args[1].0 is YYObj_Name(_dollar3)
+  let _sub_action_0_result = yy_action_49(_last_pos, _args[0:1])
+  let _sub_action_1_result = yy_action_33(_args[0].2, _args[1:3])
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _sub_action_1_result is YYObj_Visibility(_dollar2)
+  guard _args[4].0 is YYObj__Name___list_List_TypeParamNoConstraints__(_dollar4)
+  guard _args[6].0 is YYObj__list_List_ConstrDecl_(_dollar6)
   YYObj_TypeSig(
     {
       ()
       TypeSig::{
-        vis: _dollar1,
-        name: _dollar3,
-        type_params: @list.empty(),
-        components: Error(NoPayload),
+        attrs: _dollar1,
+        vis: _dollar2,
+        name: _dollar4.0,
+        type_params: _dollar4.1,
+        components: Variant(_dollar6),
       }
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 188|    vis "struct" type_decl_name_with_params "{" separated_list(";", record_decl_field) "}" { TypeSig::{vis: $1, name: $3.0, type_params: $3.1, components: Record($5)} }
+// 217|    attributes vis "impl" type_params_with_constraints qualified_uident "for" type_ {
+// 218|    ImplSig::{type_params : $4, trait_name : $5, type_ : $7, attrs : $1}
+// 219|  }
 
 ///|
 fn yy_action_83(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_46(_last_pos, _args[0:0])
-  guard _sub_action_0_result is YYObj_Visibility(_dollar1)
-  guard _args[1].0 is YYObj__Name___list_List_TypeParamNoConstraints__(_dollar3)
-  guard _args[3].0 is YYObj__list_List_FieldDecl_(_dollar5)
-  YYObj_TypeSig(
+  let _sub_action_0_result = yy_action_49(_last_pos, _args[0:1])
+  let _sub_action_1_result = yy_action_33(_args[0].2, _args[1:3])
+  guard _args[4].0 is YYObj__list_List_TypeParamWithConstraints_(_dollar4)
+  guard _args[5].0 is YYObj_QualifiedName(_dollar5)
+  guard _args[7].0 is YYObj_Type(_dollar7)
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  YYObj_ImplSig(
     {
       ()
-      TypeSig::{
-        vis: _dollar1,
-        name: _dollar3.0,
-        type_params: _dollar3.1,
-        components: Record(_dollar5),
+      ImplSig::{
+        type_params: _dollar4,
+        trait_name: _dollar5,
+        type_: _dollar7,
+        attrs: _dollar1,
       }
     },
   )
 }
 
-// file:///./stdlib.mbty
-// 55|    separated_nonempty_list(SEP, X) { $1 }
+// file:///./mbti_parser.mbty
+// 220|    attributes vis "impl" qualified_uident "for" type_ { 
+// 221|    ImplSig::{type_params : @list.empty(), trait_name : $4, type_ : $6, attrs : $1}
+// 222|  }
 
 ///|
 fn yy_action_84(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[0].0 is YYObj__list_List_FieldDecl_(_dollar1)
-  YYObj__list_List_FieldDecl_(
+  let _sub_action_0_result = yy_action_49(_last_pos, _args[0:1])
+  let _sub_action_1_result = yy_action_33(_args[0].2, _args[1:3])
+  guard _args[4].0 is YYObj_QualifiedName(_dollar4)
+  guard _args[6].0 is YYObj_Type(_dollar6)
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  YYObj_ImplSig(
     {
       ()
-      _dollar1
+      ImplSig::{
+        type_params: @list.empty(),
+        trait_name: _dollar4,
+        type_: _dollar6,
+        attrs: _dollar1,
+      }
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 226|    attributes boption("mut") LIDENT ":" type_ { 
-// 227|    FieldDecl::{ name: FieldName::{ label: $3, loc : mk_loc($loc($3)) }, vis: Default, mut_: $2, ty: $5, loc: mk_loc($sloc), attrs: $1, doc: DocString::empty() } 
+// 226|    attributes vis "trait" uident loption(preceded(":", separated_nonempty_list("+", qualified_uident))) "{" separated_nonempty_list(";", trait_method_sig) "}" { 
+// 227|    TraitSig::{ attrs : $1, vis: $2, name: $4, super_traits: $5, methods: $7} 
 // 228|  }
 
 ///|
@@ -2236,1572 +2691,1916 @@ fn yy_action_85(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_24(_last_pos, _args[0:0])
-  guard _args[1].0 is YYObj_String(_dollar3)
-  let _start_pos_of_item2 = _args[1].1
-  let _end_pos_of_item2 = _args[1].2
-  guard _args[0].0 is YYObj_Bool(_dollar2)
-  guard _args[3].0 is YYObj_Type(_dollar5)
-  let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
-  let _end_pos = if _args.length() == 0 {
-    _last_pos
-  } else {
-    _args[_args.length() - 1].2
-  }
+  let _sub_action_0_result = yy_action_49(_last_pos, _args[0:1])
+  let _sub_action_1_result = yy_action_33(_args[0].2, _args[1:3])
   guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
-  YYObj_FieldDecl(
+  guard _sub_action_1_result is YYObj_Visibility(_dollar2)
+  guard _args[4].0 is YYObj_Name(_dollar4)
+  guard _args[5].0 is YYObj__list_List_QualifiedName_(_dollar5)
+  guard _args[7].0 is YYObj__list_List_TraitMethodSig_(_dollar7)
+  YYObj_TraitSig(
     {
       ()
-      FieldDecl::{
-        name: FieldName::{
-          label: _dollar3,
-          loc: mk_loc((_start_pos_of_item2, _end_pos_of_item2)),
-        },
-        vis: Default,
-        mut_: _dollar2,
-        ty: _dollar5,
-        loc: mk_loc((_symbol_start_pos, _end_pos)),
+      TraitSig::{
         attrs: _dollar1,
-        doc: DocString::empty(),
+        vis: _dollar2,
+        name: _dollar4,
+        super_traits: _dollar5,
+        methods: _dollar7,
       }
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 226|    attributes boption("mut") LIDENT ":" type_ { 
-// 227|    FieldDecl::{ name: FieldName::{ label: $3, loc : mk_loc($loc($3)) }, vis: Default, mut_: $2, ty: $5, loc: mk_loc($sloc), attrs: $1, doc: DocString::empty() } 
-// 228|  }
+// 229|    attributes vis "trait" uident {
+// 230|    TraitSig::{ attrs : $1, vis: $2, name: $4, super_traits: @list.empty(), methods: @list.empty() } 
+// 231|  }
 
 ///|
 fn yy_action_86(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_26(_last_pos, _args[0:1])
-  guard _args[2].0 is YYObj_String(_dollar3)
-  let _start_pos_of_item2 = _args[2].1
-  let _end_pos_of_item2 = _args[2].2
-  guard _args[1].0 is YYObj_Bool(_dollar2)
-  guard _args[4].0 is YYObj_Type(_dollar5)
-  let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
-  let _end_pos = if _args.length() == 0 {
-    _last_pos
-  } else {
-    _args[_args.length() - 1].2
-  }
+  let _sub_action_0_result = yy_action_49(_last_pos, _args[0:1])
+  let _sub_action_1_result = yy_action_33(_args[0].2, _args[1:3])
   guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
-  YYObj_FieldDecl(
+  guard _sub_action_1_result is YYObj_Visibility(_dollar2)
+  guard _args[4].0 is YYObj_Name(_dollar4)
+  YYObj_TraitSig(
     {
       ()
-      FieldDecl::{
-        name: FieldName::{
-          label: _dollar3,
-          loc: mk_loc((_start_pos_of_item2, _end_pos_of_item2)),
-        },
-        vis: Default,
-        mut_: _dollar2,
-        ty: _dollar5,
-        loc: mk_loc((_symbol_start_pos, _end_pos)),
+      TraitSig::{
         attrs: _dollar1,
-        doc: DocString::empty(),
+        vis: _dollar2,
+        name: _dollar4,
+        super_traits: @list.empty(),
+        methods: @list.empty(),
       }
     },
   )
 }
 
-// file:///./stdlib.mbty
-// 60|    X SEP separated_nonempty_list(SEP, X) { $3.add($1) }
+// file:///./mbti_parser.mbty
+// 245|    attributes vis "using" PACKAGE_NAME "{" "type" uident using_binder "}" {
+// 246|    let pkg = Name::{ name : $4, loc : mk_loc($loc($4)) }
+// 247|    Using(pkg~, target = $7, name = $8, kind = Type, attrs = $1)
+// 248|  }
 
 ///|
 fn yy_action_87(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[2].0 is YYObj__list_List_FieldDecl_(_dollar3)
-  guard _args[0].0 is YYObj_FieldDecl(_dollar1)
-  YYObj__list_List_FieldDecl_(
+  let _sub_action_0_result = yy_action_49(_last_pos, _args[0:1])
+  let _sub_action_1_result = yy_action_33(_args[0].2, _args[1:3])
+  guard _args[4].0 is YYObj_String(_dollar4)
+  let _start_pos_of_item3 = _args[4].1
+  let _end_pos_of_item3 = _args[4].2
+  guard _args[7].0 is YYObj_Name(_dollar7)
+  guard _args[8].0 is YYObj_Name_(_dollar8)
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  YYObj_AliasSig(
     {
       ()
-      _dollar3.add(_dollar1)
+      let pkg = Name::{
+        name: _dollar4,
+        loc: mk_loc((_start_pos_of_item3, _end_pos_of_item3)),
+      }
+      Using(pkg~, target=_dollar7, name=_dollar8, kind=Type, attrs=_dollar1)
     },
   )
 }
 
-// file:///./stdlib.mbty
-// 59|    X { @list.singleton($1) }
+// file:///./mbti_parser.mbty
+// 249|    attributes vis "using" PACKAGE_NAME "{" "trait" uident using_binder "}" {
+// 250|    let pkg = Name::{ name : $4, loc : mk_loc($loc($4)) }
+// 251|    Using(pkg~, target = $7, name = $8, kind = Trait, attrs = $1)
+// 252|  }
 
 ///|
 fn yy_action_88(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[0].0 is YYObj_FieldDecl(_dollar1)
-  YYObj__list_List_FieldDecl_(
+  let _sub_action_0_result = yy_action_49(_last_pos, _args[0:1])
+  let _sub_action_1_result = yy_action_33(_args[0].2, _args[1:3])
+  guard _args[4].0 is YYObj_String(_dollar4)
+  let _start_pos_of_item3 = _args[4].1
+  let _end_pos_of_item3 = _args[4].2
+  guard _args[7].0 is YYObj_Name(_dollar7)
+  guard _args[8].0 is YYObj_Name_(_dollar8)
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  YYObj_AliasSig(
     {
       ()
-      @list.singleton(_dollar1)
+      let pkg = Name::{
+        name: _dollar4,
+        loc: mk_loc((_start_pos_of_item3, _end_pos_of_item3)),
+      }
+      Using(pkg~, target=_dollar7, name=_dollar8, kind=Trait, attrs=_dollar1)
     },
   )
 }
 
-// file:///./stdlib.mbty
-// 54|    { @list.empty() }
+// file:///./mbti_parser.mbty
+// 402|    "pub" pub_attr { Pub(attr=$2, loc=mk_loc($sloc)) }
 
 ///|
-fn yy_action_89(
+fn yy_action_33(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  YYObj__list_List_FieldDecl_(
+  guard _args[1].0 is YYObj_String_(_dollar2)
+  let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
+  let _end_pos = if _args.length() == 0 {
+    _last_pos
+  } else {
+    _args[_args.length() - 1].2
+  }
+  YYObj_Visibility(
     {
       ()
-      @list.empty()
+      Pub(attr=_dollar2, loc=mk_loc((_symbol_start_pos, _end_pos)))
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 189|    vis "struct" type_decl_name_with_params "(" separated_list(",", type_) ")" { TypeSig::{vis: $1, name: $3.0, type_params: $3.1, components: TupleStruct($5)} }
+// 407|    "(" "readonly" ")" { Some("readonly") }
 
 ///|
-fn yy_action_90(
+fn yy_action_89(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_46(_last_pos, _args[0:0])
-  guard _sub_action_0_result is YYObj_Visibility(_dollar1)
-  guard _args[1].0 is YYObj__Name___list_List_TypeParamNoConstraints__(_dollar3)
-  guard _args[3].0 is YYObj__list_List_Type_(_dollar5)
-  YYObj_TypeSig(
+  YYObj_String_(
     {
       ()
-      TypeSig::{
-        vis: _dollar1,
-        name: _dollar3.0,
-        type_params: _dollar3.1,
-        components: TupleStruct(_dollar5),
-      }
+      Some("readonly")
     },
   )
 }
 
-// file:///./stdlib.mbty
-// 55|    separated_nonempty_list(SEP, X) { $1 }
+// file:///./mbti_parser.mbty
+// 408|    "(" LIDENT ")" { Some($2) }
 
 ///|
-fn yy_action_91(
+fn yy_action_90(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[0].0 is YYObj__list_List_Type_(_dollar1)
-  YYObj__list_List_Type_(
+  guard _args[1].0 is YYObj_String(_dollar2)
+  YYObj_String_(
     {
       ()
-      _dollar1
+      Some(_dollar2)
     },
   )
 }
 
-// file:///./stdlib.mbty
-// 54|    { @list.empty() }
+// file:///./mbti_parser.mbty
+// 406|    { None }
 
 ///|
-fn yy_action_92(
+fn yy_action_91(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  YYObj__list_List_Type_(
+  YYObj_String_(
     {
       ()
-      @list.empty()
+      None
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 190|    vis "enum" type_decl_name_with_params "{" separated_list(";", enum_constructor) "}" { TypeSig::{vis: $1, name: $3.0, type_params: $3.1, components: Variant($5)} }
+// 158|    attributes vis "let" lident ":" type_ { ValueSig::{ attrs: $1, name: $4, type_: $6 } }
 
 ///|
-fn yy_action_93(
+fn yy_action_92(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_46(_last_pos, _args[0:0])
-  guard _sub_action_0_result is YYObj_Visibility(_dollar1)
-  guard _args[1].0 is YYObj__Name___list_List_TypeParamNoConstraints__(_dollar3)
-  guard _args[3].0 is YYObj__list_List_ConstrDecl_(_dollar5)
-  YYObj_TypeSig(
+  let _sub_action_0_result = yy_action_49(_last_pos, _args[0:1])
+  let _sub_action_1_result = yy_action_15(_args[0].2, _args[1:1])
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _args[2].0 is YYObj_Name(_dollar4)
+  guard _args[4].0 is YYObj_Type(_dollar6)
+  YYObj_ValueSig(
     {
       ()
-      TypeSig::{
-        vis: _dollar1,
-        name: _dollar3.0,
-        type_params: _dollar3.1,
-        components: Variant(_dollar5),
-      }
+      ValueSig::{ attrs: _dollar1, name: _dollar4, type_: _dollar6 }
     },
   )
 }
 
-// file:///./stdlib.mbty
-// 55|    separated_nonempty_list(SEP, X) { $1 }
+// file:///./mbti_parser.mbty
+// 176|    attributes is_async FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident delimited("(", separated_list(",", parameter), ")") "->" return_type {
+// 177|    FuncSig::{ attrs: $1, is_async : $2, type_name: $5, name: $6, type_params: $4, params: $7, return_: $9}
+// 178|  }
 
 ///|
-fn yy_action_94(
+fn yy_action_93(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[0].0 is YYObj__list_List_ConstrDecl_(_dollar1)
-  YYObj__list_List_ConstrDecl_(
+  let _sub_action_0_result = yy_action_49(_last_pos, _args[0:1])
+  let _sub_action_1_result = yy_action_94(_args[0].2, _args[1:2])
+  let _sub_action_2_result = yy_action_95(_args[5].2, _args[6:9])
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _sub_action_1_result is YYObj_Location_(_dollar2)
+  guard _args[4].0 is YYObj_Option_MethodSelfType_(_dollar5)
+  guard _args[5].0 is YYObj_Name(_dollar6)
+  guard _args[3].0 is YYObj__list_List_TypeParamWithConstraints_(_dollar4)
+  guard _sub_action_2_result is YYObj__list_List_Parameter_(_dollar7)
+  guard _args[10].0 is YYObj__Type__ErrorType_(_dollar9)
+  YYObj_FuncSig(
     {
       ()
-      _dollar1
+      FuncSig::{
+        attrs: _dollar1,
+        is_async: _dollar2,
+        type_name: _dollar5,
+        name: _dollar6,
+        type_params: _dollar4,
+        params: _dollar7,
+        return_: _dollar9,
+      }
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 211|    attributes UIDENT option(delimited("(", separated_nonempty_list(",", constructor_param), ")")) option(eq_tag) { 
-// 212|    ConstrDecl::{name: ConstrName::{ name : $2, loc : mk_loc($loc($2)) }, args: $3, tag: $4, loc: mk_loc($sloc), attrs: $1, doc: DocString::empty()} 
-// 213|  }
+// 176|    attributes is_async FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident delimited("(", separated_list(",", parameter), ")") "->" return_type {
+// 177|    FuncSig::{ attrs: $1, is_async : $2, type_name: $5, name: $6, type_params: $4, params: $7, return_: $9}
+// 178|  }
 
 ///|
-fn yy_action_95(
+fn yy_action_96(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_24(_last_pos, _args[0:0])
-  guard _args[0].0 is YYObj_String(_dollar2)
-  let _start_pos_of_item1 = _args[0].1
-  let _end_pos_of_item1 = _args[0].2
-  guard _args[1].0 is YYObj_Option__list_List_ConstrParam__(_dollar3)
-  guard _args[2].0 is YYObj_Option__String__Location__(_dollar4)
-  let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
-  let _end_pos = if _args.length() == 0 {
-    _last_pos
-  } else {
-    _args[_args.length() - 1].2
-  }
+  let _sub_action_0_result = yy_action_49(_last_pos, _args[0:1])
+  let _sub_action_1_result = yy_action_97(_args[0].2, _args[1:1])
+  let _sub_action_2_result = yy_action_95(_args[4].2, _args[5:8])
   guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
-  YYObj_ConstrDecl(
+  guard _sub_action_1_result is YYObj_Location_(_dollar2)
+  guard _args[3].0 is YYObj_Option_MethodSelfType_(_dollar5)
+  guard _args[4].0 is YYObj_Name(_dollar6)
+  guard _args[2].0 is YYObj__list_List_TypeParamWithConstraints_(_dollar4)
+  guard _sub_action_2_result is YYObj__list_List_Parameter_(_dollar7)
+  guard _args[9].0 is YYObj__Type__ErrorType_(_dollar9)
+  YYObj_FuncSig(
     {
       ()
-      ConstrDecl::{
-        name: ConstrName::{
-          name: _dollar2,
-          loc: mk_loc((_start_pos_of_item1, _end_pos_of_item1)),
-        },
-        args: _dollar3,
-        tag: _dollar4,
-        loc: mk_loc((_symbol_start_pos, _end_pos)),
+      FuncSig::{
         attrs: _dollar1,
-        doc: DocString::empty(),
+        is_async: _dollar2,
+        type_name: _dollar5,
+        name: _dollar6,
+        type_params: _dollar4,
+        params: _dollar7,
+        return_: _dollar9,
       }
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 374|     {  @list.empty() }
+// 239|    attributes vis "type"  type_decl_name_with_params "=" type_ {
+// 240|    TypeAlias(attrs = $1, vis=$2, name=$4.0, type_params=$4.1, type_=$6) 
+// 241|  }
 
 ///|
-fn yy_action_24(
+fn yy_action_98(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  YYObj__list_List_Attribute_(
+  let _sub_action_0_result = yy_action_49(_last_pos, _args[0:1])
+  let _sub_action_1_result = yy_action_15(_args[0].2, _args[1:1])
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _sub_action_1_result is YYObj_Visibility(_dollar2)
+  guard _args[2].0 is YYObj__Name___list_List_TypeParamNoConstraints__(_dollar4)
+  guard _args[4].0 is YYObj_Type(_dollar6)
+  YYObj_AliasSig(
     {
       ()
-      @list.empty()
+      TypeAlias(
+        attrs=_dollar1,
+        vis=_dollar2,
+        name=_dollar4.0,
+        type_params=_dollar4.1,
+        type_=_dollar6,
+      )
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 211|    attributes UIDENT option(delimited("(", separated_nonempty_list(",", constructor_param), ")")) option(eq_tag) { 
-// 212|    ConstrDecl::{name: ConstrName::{ name : $2, loc : mk_loc($loc($2)) }, args: $3, tag: $4, loc: mk_loc($sloc), attrs: $1, doc: DocString::empty()} 
-// 213|  }
+// 192|    attributes vis "type" type_decl_name_with_params {
+// 193|    TypeSig::{attrs : $1, vis: $2, name: $4.0, type_params: $4.1, components: Abstract} 
+// 194|  }
 
 ///|
-fn yy_action_96(
+fn yy_action_99(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_26(_last_pos, _args[0:1])
-  guard _args[1].0 is YYObj_String(_dollar2)
-  let _start_pos_of_item1 = _args[1].1
-  let _end_pos_of_item1 = _args[1].2
-  guard _args[2].0 is YYObj_Option__list_List_ConstrParam__(_dollar3)
-  guard _args[3].0 is YYObj_Option__String__Location__(_dollar4)
-  let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
-  let _end_pos = if _args.length() == 0 {
-    _last_pos
-  } else {
-    _args[_args.length() - 1].2
-  }
+  let _sub_action_0_result = yy_action_49(_last_pos, _args[0:1])
+  let _sub_action_1_result = yy_action_15(_args[0].2, _args[1:1])
   guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
-  YYObj_ConstrDecl(
+  guard _sub_action_1_result is YYObj_Visibility(_dollar2)
+  guard _args[2].0 is YYObj__Name___list_List_TypeParamNoConstraints__(_dollar4)
+  YYObj_TypeSig(
     {
       ()
-      ConstrDecl::{
-        name: ConstrName::{
-          name: _dollar2,
-          loc: mk_loc((_start_pos_of_item1, _end_pos_of_item1)),
-        },
-        args: _dollar3,
-        tag: _dollar4,
-        loc: mk_loc((_symbol_start_pos, _end_pos)),
+      TypeSig::{
         attrs: _dollar1,
-        doc: DocString::empty(),
+        vis: _dollar2,
+        name: _dollar4.0,
+        type_params: _dollar4.1,
+        components: Abstract,
       }
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 375|    nonempty_list(attribute) { $1 }
+// 195|    attributes vis "suberror" uident option(type_) {
+// 196|    let exception_decl : @syntax.ExceptionDecl = match $5 {
+// 197|      None => NoPayload
+// 198|      Some(ty) => SinglePayload(ty)
+// 199|    }
+// 200|    TypeSig::{attrs : $1, vis: $2, name: $4, type_params: @list.empty(), components: Error(exception_decl)}
+// 201|  }
 
 ///|
-fn yy_action_26(
+fn yy_action_100(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[0].0 is YYObj__list_List_Attribute_(_dollar1)
-  YYObj__list_List_Attribute_(
+  let _sub_action_0_result = yy_action_49(_last_pos, _args[0:1])
+  let _sub_action_1_result = yy_action_15(_args[0].2, _args[1:1])
+  guard _args[3].0 is YYObj_Option_Type_(_dollar5)
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _sub_action_1_result is YYObj_Visibility(_dollar2)
+  guard _args[2].0 is YYObj_Name(_dollar4)
+  YYObj_TypeSig(
     {
       ()
-      _dollar1
+      let exception_decl : @syntax.ExceptionDecl = match _dollar5 {
+        None => NoPayload
+        Some(ty) => SinglePayload(ty)
+      }
+      TypeSig::{
+        attrs: _dollar1,
+        vis: _dollar2,
+        name: _dollar4,
+        type_params: @list.empty(),
+        components: Error(exception_decl),
+      }
     },
   )
 }
 
-// file:///./stdlib.mbty
-// 5|    X { Some($1) }
+// file:///./mbti_parser.mbty
+// 202|    attributes vis "suberror" uident "{" separated_list(";", enum_constructor) "}" {
+// 203|    TypeSig::{attrs : $1, vis: $2, name: $4, type_params: @list.empty(), components: Error(EnumPayload($6))}
+// 204|  }
 
 ///|
-fn yy_action_97(
+fn yy_action_101(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_98(_last_pos, _args[0:2])
-  guard _sub_action_0_result is YYObj__String__Location_(_dollar1)
-  YYObj_Option__String__Location__(
+  let _sub_action_0_result = yy_action_49(_last_pos, _args[0:1])
+  let _sub_action_1_result = yy_action_15(_args[0].2, _args[1:1])
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _sub_action_1_result is YYObj_Visibility(_dollar2)
+  guard _args[2].0 is YYObj_Name(_dollar4)
+  guard _args[4].0 is YYObj__list_List_ConstrDecl_(_dollar6)
+  YYObj_TypeSig(
     {
       ()
-      Some(_dollar1)
+      TypeSig::{
+        attrs: _dollar1,
+        vis: _dollar2,
+        name: _dollar4,
+        type_params: @list.empty(),
+        components: Error(EnumPayload(_dollar6)),
+      }
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 217|    "=" INT { ($2, mk_loc($loc($2))) }
+// 205|    attributes vis "struct" type_decl_name_with_params "{" record_decl_body "}" {
+// 206|    TypeSig::{attrs : $1, vis: $2, name: $4.0, type_params: $4.1, components: $6 }
+// 207|  }
 
 ///|
-fn yy_action_98(
+fn yy_action_102(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[1].0 is YYObj_String(_dollar2)
-  let _start_pos_of_item1 = _args[1].1
-  let _end_pos_of_item1 = _args[1].2
-  YYObj__String__Location_(
+  let _sub_action_0_result = yy_action_49(_last_pos, _args[0:1])
+  let _sub_action_1_result = yy_action_15(_args[0].2, _args[1:1])
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _sub_action_1_result is YYObj_Visibility(_dollar2)
+  guard _args[2].0 is YYObj__Name___list_List_TypeParamNoConstraints__(_dollar4)
+  guard _args[4].0 is YYObj_TypeDefinition(_dollar6)
+  YYObj_TypeSig(
     {
       ()
-      (_dollar2, mk_loc((_start_pos_of_item1, _end_pos_of_item1)))
+      TypeSig::{
+        attrs: _dollar1,
+        vis: _dollar2,
+        name: _dollar4.0,
+        type_params: _dollar4.1,
+        components: _dollar6,
+      }
     },
   )
 }
 
-// file:///./stdlib.mbty
-// 4|    { None }
+// file:///./mbti_parser.mbty
+// 208|    attributes vis "struct" type_decl_name_with_params "(" separated_list(",", type_) ")" {
+// 209|    TypeSig::{attrs : $1, vis: $2, name: $4.0, type_params: $4.1, components: TupleStruct($6)}
+// 210|  }
 
 ///|
-fn yy_action_99(
+fn yy_action_103(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  YYObj_Option__String__Location__(
+  let _sub_action_0_result = yy_action_49(_last_pos, _args[0:1])
+  let _sub_action_1_result = yy_action_15(_args[0].2, _args[1:1])
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _sub_action_1_result is YYObj_Visibility(_dollar2)
+  guard _args[2].0 is YYObj__Name___list_List_TypeParamNoConstraints__(_dollar4)
+  guard _args[4].0 is YYObj__list_List_Type_(_dollar6)
+  YYObj_TypeSig(
     {
       ()
-      None
+      TypeSig::{
+        attrs: _dollar1,
+        vis: _dollar2,
+        name: _dollar4.0,
+        type_params: _dollar4.1,
+        components: TupleStruct(_dollar6),
+      }
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 221|    boption("mut") type_ { ConstrParam::{mut_: $1, ty: $2, label: None} }
+// 211|    attributes vis "enum" type_decl_name_with_params "{" separated_list(";", enum_constructor) "}" {
+// 212|    TypeSig::{attrs : $1, vis: $2, name: $4.0, type_params: $4.1, components: Variant($6)}
+// 213|  }
 
 ///|
-fn yy_action_100(
+fn yy_action_104(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[0].0 is YYObj_Bool(_dollar1)
-  guard _args[1].0 is YYObj_Type(_dollar2)
-  YYObj_ConstrParam(
+  let _sub_action_0_result = yy_action_49(_last_pos, _args[0:1])
+  let _sub_action_1_result = yy_action_15(_args[0].2, _args[1:1])
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _sub_action_1_result is YYObj_Visibility(_dollar2)
+  guard _args[2].0 is YYObj__Name___list_List_TypeParamNoConstraints__(_dollar4)
+  guard _args[4].0 is YYObj__list_List_ConstrDecl_(_dollar6)
+  YYObj_TypeSig(
     {
       ()
-      ConstrParam::{ mut_: _dollar1, ty: _dollar2, label: None }
+      TypeSig::{
+        attrs: _dollar1,
+        vis: _dollar2,
+        name: _dollar4.0,
+        type_params: _dollar4.1,
+        components: Variant(_dollar6),
+      }
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 222|    boption("mut") post_label ":" type_ { ConstrParam::{mut_: $1, ty: $4, label: Some($2)} }
+// 217|    attributes vis "impl" type_params_with_constraints qualified_uident "for" type_ {
+// 218|    ImplSig::{type_params : $4, trait_name : $5, type_ : $7, attrs : $1}
+// 219|  }
 
 ///|
-fn yy_action_101(
+fn yy_action_105(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[0].0 is YYObj_Bool(_dollar1)
-  guard _args[3].0 is YYObj_Type(_dollar4)
-  guard _args[1].0 is YYObj_Label(_dollar2)
-  YYObj_ConstrParam(
+  let _sub_action_0_result = yy_action_49(_last_pos, _args[0:1])
+  let _sub_action_1_result = yy_action_15(_args[0].2, _args[1:1])
+  guard _args[2].0 is YYObj__list_List_TypeParamWithConstraints_(_dollar4)
+  guard _args[3].0 is YYObj_QualifiedName(_dollar5)
+  guard _args[5].0 is YYObj_Type(_dollar7)
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  YYObj_ImplSig(
     {
       ()
-      ConstrParam::{ mut_: _dollar1, ty: _dollar4, label: Some(_dollar2) }
+      ImplSig::{
+        type_params: _dollar4,
+        trait_name: _dollar5,
+        type_: _dollar7,
+        attrs: _dollar1,
+      }
     },
   )
 }
 
-// file:///./stdlib.mbty
-// 60|    X SEP separated_nonempty_list(SEP, X) { $3.add($1) }
+// file:///./mbti_parser.mbty
+// 220|    attributes vis "impl" qualified_uident "for" type_ { 
+// 221|    ImplSig::{type_params : @list.empty(), trait_name : $4, type_ : $6, attrs : $1}
+// 222|  }
 
 ///|
-fn yy_action_102(
+fn yy_action_106(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[2].0 is YYObj__list_List_ConstrParam_(_dollar3)
-  guard _args[0].0 is YYObj_ConstrParam(_dollar1)
-  YYObj__list_List_ConstrParam_(
-    {
-      ()
-      _dollar3.add(_dollar1)
-    },
-  )
-}
-
-// file:///./stdlib.mbty
-// 59|    X { @list.singleton($1) }
-
-///|
-fn yy_action_103(
-  _last_pos : @basic.Position,
-  _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
-) -> YYObj {
-  guard _args[0].0 is YYObj_ConstrParam(_dollar1)
-  YYObj__list_List_ConstrParam_(
-    {
-      ()
-      @list.singleton(_dollar1)
-    },
-  )
-}
-
-// file:///./stdlib.mbty
-// 5|    X { Some($1) }
-
-///|
-fn yy_action_104(
-  _last_pos : @basic.Position,
-  _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
-) -> YYObj {
-  let _sub_action_0_result = yy_action_105(_last_pos, _args[0:3])
-  guard _sub_action_0_result is YYObj__list_List_ConstrParam_(_dollar1)
-  YYObj_Option__list_List_ConstrParam__(
-    {
-      ()
-      Some(_dollar1)
-    },
-  )
-}
-
-// file:///./stdlib.mbty
-// 40|    L X R { $2 }
-
-///|
-fn yy_action_105(
-  _last_pos : @basic.Position,
-  _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
-) -> YYObj {
-  guard _args[1].0 is YYObj__list_List_ConstrParam_(_dollar2)
-  YYObj__list_List_ConstrParam_(
-    {
-      ()
-      _dollar2
-    },
-  )
-}
-
-// file:///./stdlib.mbty
-// 20|    X { true }
-
-///|
-fn yy_action_106(
-  _last_pos : @basic.Position,
-  _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
-) -> YYObj {
-  YYObj_Bool(
+  let _sub_action_0_result = yy_action_49(_last_pos, _args[0:1])
+  let _sub_action_1_result = yy_action_15(_args[0].2, _args[1:1])
+  guard _args[2].0 is YYObj_QualifiedName(_dollar4)
+  guard _args[4].0 is YYObj_Type(_dollar6)
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  YYObj_ImplSig(
     {
       ()
-      true
+      ImplSig::{
+        type_params: @list.empty(),
+        trait_name: _dollar4,
+        type_: _dollar6,
+        attrs: _dollar1,
+      }
     },
   )
 }
 
-// file:///./stdlib.mbty
-// 19|    { false }
+// file:///./mbti_parser.mbty
+// 226|    attributes vis "trait" uident loption(preceded(":", separated_nonempty_list("+", qualified_uident))) "{" separated_nonempty_list(";", trait_method_sig) "}" { 
+// 227|    TraitSig::{ attrs : $1, vis: $2, name: $4, super_traits: $5, methods: $7} 
+// 228|  }
 
 ///|
 fn yy_action_107(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  YYObj_Bool(
+  let _sub_action_0_result = yy_action_49(_last_pos, _args[0:1])
+  let _sub_action_1_result = yy_action_15(_args[0].2, _args[1:1])
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _sub_action_1_result is YYObj_Visibility(_dollar2)
+  guard _args[2].0 is YYObj_Name(_dollar4)
+  guard _args[3].0 is YYObj__list_List_QualifiedName_(_dollar5)
+  guard _args[5].0 is YYObj__list_List_TraitMethodSig_(_dollar7)
+  YYObj_TraitSig(
     {
       ()
-      false
+      TraitSig::{
+        attrs: _dollar1,
+        vis: _dollar2,
+        name: _dollar4,
+        super_traits: _dollar5,
+        methods: _dollar7,
+      }
     },
   )
 }
 
-// file:///./stdlib.mbty
-// 4|    { None }
+// file:///./mbti_parser.mbty
+// 229|    attributes vis "trait" uident {
+// 230|    TraitSig::{ attrs : $1, vis: $2, name: $4, super_traits: @list.empty(), methods: @list.empty() } 
+// 231|  }
 
 ///|
 fn yy_action_108(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  YYObj_Option__list_List_ConstrParam__(
+  let _sub_action_0_result = yy_action_49(_last_pos, _args[0:1])
+  let _sub_action_1_result = yy_action_15(_args[0].2, _args[1:1])
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _sub_action_1_result is YYObj_Visibility(_dollar2)
+  guard _args[2].0 is YYObj_Name(_dollar4)
+  YYObj_TraitSig(
     {
       ()
-      None
+      TraitSig::{
+        attrs: _dollar1,
+        vis: _dollar2,
+        name: _dollar4,
+        super_traits: @list.empty(),
+        methods: @list.empty(),
+      }
     },
   )
 }
 
-// file:///./stdlib.mbty
-// 60|    X SEP separated_nonempty_list(SEP, X) { $3.add($1) }
+// file:///./mbti_parser.mbty
+// 242|    attributes "fnalias" uident "::" lident {
+// 243|    FuncAlias(attrs = $1,name=$5, type_name=$3)
+// 244|  }
 
 ///|
 fn yy_action_109(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[2].0 is YYObj__list_List_ConstrDecl_(_dollar3)
-  guard _args[0].0 is YYObj_ConstrDecl(_dollar1)
-  YYObj__list_List_ConstrDecl_(
+  let _sub_action_0_result = yy_action_49(_last_pos, _args[0:1])
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _args[4].0 is YYObj_Name(_dollar5)
+  guard _args[2].0 is YYObj_Name(_dollar3)
+  YYObj_AliasSig(
     {
       ()
-      _dollar3.add(_dollar1)
+      FuncAlias(attrs=_dollar1, name=_dollar5, type_name=_dollar3)
     },
   )
 }
 
-// file:///./stdlib.mbty
-// 59|    X { @list.singleton($1) }
+// file:///./mbti_parser.mbty
+// 245|    attributes vis "using" PACKAGE_NAME "{" "type" uident using_binder "}" {
+// 246|    let pkg = Name::{ name : $4, loc : mk_loc($loc($4)) }
+// 247|    Using(pkg~, target = $7, name = $8, kind = Type, attrs = $1)
+// 248|  }
 
 ///|
 fn yy_action_110(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[0].0 is YYObj_ConstrDecl(_dollar1)
-  YYObj__list_List_ConstrDecl_(
+  let _sub_action_0_result = yy_action_49(_last_pos, _args[0:1])
+  let _sub_action_1_result = yy_action_15(_args[0].2, _args[1:1])
+  guard _args[2].0 is YYObj_String(_dollar4)
+  let _start_pos_of_item3 = _args[2].1
+  let _end_pos_of_item3 = _args[2].2
+  guard _args[5].0 is YYObj_Name(_dollar7)
+  guard _args[6].0 is YYObj_Name_(_dollar8)
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  YYObj_AliasSig(
     {
       ()
-      @list.singleton(_dollar1)
+      let pkg = Name::{
+        name: _dollar4,
+        loc: mk_loc((_start_pos_of_item3, _end_pos_of_item3)),
+      }
+      Using(pkg~, target=_dollar7, name=_dollar8, kind=Type, attrs=_dollar1)
     },
   )
 }
 
-// file:///./stdlib.mbty
-// 54|    { @list.empty() }
+// file:///./mbti_parser.mbty
+// 249|    attributes vis "using" PACKAGE_NAME "{" "trait" uident using_binder "}" {
+// 250|    let pkg = Name::{ name : $4, loc : mk_loc($loc($4)) }
+// 251|    Using(pkg~, target = $7, name = $8, kind = Trait, attrs = $1)
+// 252|  }
 
 ///|
 fn yy_action_111(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  YYObj__list_List_ConstrDecl_(
+  let _sub_action_0_result = yy_action_49(_last_pos, _args[0:1])
+  let _sub_action_1_result = yy_action_15(_args[0].2, _args[1:1])
+  guard _args[2].0 is YYObj_String(_dollar4)
+  let _start_pos_of_item3 = _args[2].1
+  let _end_pos_of_item3 = _args[2].2
+  guard _args[5].0 is YYObj_Name(_dollar7)
+  guard _args[6].0 is YYObj_Name_(_dollar8)
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  YYObj_AliasSig(
     {
       ()
-      @list.empty()
+      let pkg = Name::{
+        name: _dollar4,
+        loc: mk_loc((_start_pos_of_item3, _end_pos_of_item3)),
+      }
+      Using(pkg~, target=_dollar7, name=_dollar8, kind=Trait, attrs=_dollar1)
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 194|    "impl" type_params_with_constraints qualified_uident "for" type_ { Trait(type_params=$2, trait_name=$3, type_=$5) }
+// 158|    attributes vis "let" lident ":" type_ { ValueSig::{ attrs: $1, name: $4, type_: $6 } }
 
 ///|
 fn yy_action_112(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[1].0 is YYObj__list_List_TypeParamWithConstraints_(_dollar2)
-  guard _args[2].0 is YYObj_QualifiedName(_dollar3)
-  guard _args[4].0 is YYObj_Type(_dollar5)
-  YYObj_ImplSig(
+  let _sub_action_0_result = yy_action_14(_last_pos, _args[0:0])
+  let _sub_action_1_result = yy_action_15(_last_pos, _args[0:0])
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _args[1].0 is YYObj_Name(_dollar4)
+  guard _args[3].0 is YYObj_Type(_dollar6)
+  YYObj_ValueSig(
     {
       ()
-      Trait(type_params=_dollar2, trait_name=_dollar3, type_=_dollar5)
+      ValueSig::{ attrs: _dollar1, name: _dollar4, type_: _dollar6 }
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 195|    "impl" qualified_uident "for" type_ { Trait(type_params=@list.empty(), trait_name=$2, type_=$4) }
+// 176|    attributes is_async FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident delimited("(", separated_list(",", parameter), ")") "->" return_type {
+// 177|    FuncSig::{ attrs: $1, is_async : $2, type_name: $5, name: $6, type_params: $4, params: $7, return_: $9}
+// 178|  }
 
 ///|
 fn yy_action_113(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[1].0 is YYObj_QualifiedName(_dollar2)
-  guard _args[3].0 is YYObj_Type(_dollar4)
-  YYObj_ImplSig(
+  let _sub_action_0_result = yy_action_14(_last_pos, _args[0:0])
+  let _sub_action_1_result = yy_action_94(_last_pos, _args[0:1])
+  let _sub_action_2_result = yy_action_95(_args[4].2, _args[5:8])
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _sub_action_1_result is YYObj_Location_(_dollar2)
+  guard _args[3].0 is YYObj_Option_MethodSelfType_(_dollar5)
+  guard _args[4].0 is YYObj_Name(_dollar6)
+  guard _args[2].0 is YYObj__list_List_TypeParamWithConstraints_(_dollar4)
+  guard _sub_action_2_result is YYObj__list_List_Parameter_(_dollar7)
+  guard _args[9].0 is YYObj__Type__ErrorType_(_dollar9)
+  YYObj_FuncSig(
     {
       ()
-      Trait(type_params=@list.empty(), trait_name=_dollar2, type_=_dollar4)
+      FuncSig::{
+        attrs: _dollar1,
+        is_async: _dollar2,
+        type_name: _dollar5,
+        name: _dollar6,
+        type_params: _dollar4,
+        params: _dollar7,
+        return_: _dollar9,
+      }
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 196|    "impl" uident "::" lident { DefaultImpl(trait_name=$2, method_name=$4) }
+// 176|    attributes is_async FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident delimited("(", separated_list(",", parameter), ")") "->" return_type {
+// 177|    FuncSig::{ attrs: $1, is_async : $2, type_name: $5, name: $6, type_params: $4, params: $7, return_: $9}
+// 178|  }
 
 ///|
 fn yy_action_114(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[1].0 is YYObj_Name(_dollar2)
-  guard _args[3].0 is YYObj_Name(_dollar4)
-  YYObj_ImplSig(
+  let _sub_action_0_result = yy_action_14(_last_pos, _args[0:0])
+  let _sub_action_1_result = yy_action_97(_last_pos, _args[0:0])
+  let _sub_action_2_result = yy_action_95(_args[3].2, _args[4:7])
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _sub_action_1_result is YYObj_Location_(_dollar2)
+  guard _args[2].0 is YYObj_Option_MethodSelfType_(_dollar5)
+  guard _args[3].0 is YYObj_Name(_dollar6)
+  guard _args[1].0 is YYObj__list_List_TypeParamWithConstraints_(_dollar4)
+  guard _sub_action_2_result is YYObj__list_List_Parameter_(_dollar7)
+  guard _args[8].0 is YYObj__Type__ErrorType_(_dollar9)
+  YYObj_FuncSig(
     {
       ()
-      DefaultImpl(trait_name=_dollar2, method_name=_dollar4)
+      FuncSig::{
+        attrs: _dollar1,
+        is_async: _dollar2,
+        type_name: _dollar5,
+        name: _dollar6,
+        type_params: _dollar4,
+        params: _dollar7,
+        return_: _dollar9,
+      }
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 237|    "[" separated_list(",", type_param_with_constraints) "]" { $2 }
+// 239|    attributes vis "type"  type_decl_name_with_params "=" type_ {
+// 240|    TypeAlias(attrs = $1, vis=$2, name=$4.0, type_params=$4.1, type_=$6) 
+// 241|  }
 
 ///|
 fn yy_action_115(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[1].0 is YYObj__list_List_TypeParamWithConstraints_(_dollar2)
-  YYObj__list_List_TypeParamWithConstraints_(
+  let _sub_action_0_result = yy_action_14(_last_pos, _args[0:0])
+  let _sub_action_1_result = yy_action_15(_last_pos, _args[0:0])
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _sub_action_1_result is YYObj_Visibility(_dollar2)
+  guard _args[1].0 is YYObj__Name___list_List_TypeParamNoConstraints__(_dollar4)
+  guard _args[3].0 is YYObj_Type(_dollar6)
+  YYObj_AliasSig(
     {
       ()
-      _dollar2
+      TypeAlias(
+        attrs=_dollar1,
+        vis=_dollar2,
+        name=_dollar4.0,
+        type_params=_dollar4.1,
+        type_=_dollar6,
+      )
     },
   )
 }
 
-// file:///./stdlib.mbty
-// 55|    separated_nonempty_list(SEP, X) { $1 }
+// file:///./mbti_parser.mbty
+// 192|    attributes vis "type" type_decl_name_with_params {
+// 193|    TypeSig::{attrs : $1, vis: $2, name: $4.0, type_params: $4.1, components: Abstract} 
+// 194|  }
 
 ///|
 fn yy_action_116(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[0].0 is YYObj__list_List_TypeParamWithConstraints_(_dollar1)
-  YYObj__list_List_TypeParamWithConstraints_(
+  let _sub_action_0_result = yy_action_14(_last_pos, _args[0:0])
+  let _sub_action_1_result = yy_action_15(_last_pos, _args[0:0])
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _sub_action_1_result is YYObj_Visibility(_dollar2)
+  guard _args[1].0 is YYObj__Name___list_List_TypeParamNoConstraints__(_dollar4)
+  YYObj_TypeSig(
     {
       ()
-      _dollar1
+      TypeSig::{
+        attrs: _dollar1,
+        vis: _dollar2,
+        name: _dollar4.0,
+        type_params: _dollar4.1,
+        components: Abstract,
+      }
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 233|    uident ":" separated_nonempty_list("+", type_constraint) { TypeParamWithConstraints::{name: $1, constraints: $3} }
+// 195|    attributes vis "suberror" uident option(type_) {
+// 196|    let exception_decl : @syntax.ExceptionDecl = match $5 {
+// 197|      None => NoPayload
+// 198|      Some(ty) => SinglePayload(ty)
+// 199|    }
+// 200|    TypeSig::{attrs : $1, vis: $2, name: $4, type_params: @list.empty(), components: Error(exception_decl)}
+// 201|  }
 
 ///|
 fn yy_action_117(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[0].0 is YYObj_Name(_dollar1)
-  guard _args[2].0 is YYObj__list_List_QualifiedName_(_dollar3)
-  YYObj_TypeParamWithConstraints(
+  let _sub_action_0_result = yy_action_14(_last_pos, _args[0:0])
+  let _sub_action_1_result = yy_action_15(_last_pos, _args[0:0])
+  guard _args[2].0 is YYObj_Option_Type_(_dollar5)
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _sub_action_1_result is YYObj_Visibility(_dollar2)
+  guard _args[1].0 is YYObj_Name(_dollar4)
+  YYObj_TypeSig(
     {
       ()
-      TypeParamWithConstraints::{ name: _dollar1, constraints: _dollar3 }
+      let exception_decl : @syntax.ExceptionDecl = match _dollar5 {
+        None => NoPayload
+        Some(ty) => SinglePayload(ty)
+      }
+      TypeSig::{
+        attrs: _dollar1,
+        vis: _dollar2,
+        name: _dollar4,
+        type_params: @list.empty(),
+        components: Error(exception_decl),
+      }
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 255|    qualified_uident { $1 }
+// 202|    attributes vis "suberror" uident "{" separated_list(";", enum_constructor) "}" {
+// 203|    TypeSig::{attrs : $1, vis: $2, name: $4, type_params: @list.empty(), components: Error(EnumPayload($6))}
+// 204|  }
 
 ///|
 fn yy_action_118(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[0].0 is YYObj_QualifiedName(_dollar1)
-  YYObj_QualifiedName(
+  let _sub_action_0_result = yy_action_14(_last_pos, _args[0:0])
+  let _sub_action_1_result = yy_action_15(_last_pos, _args[0:0])
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _sub_action_1_result is YYObj_Visibility(_dollar2)
+  guard _args[1].0 is YYObj_Name(_dollar4)
+  guard _args[3].0 is YYObj__list_List_ConstrDecl_(_dollar6)
+  YYObj_TypeSig(
     {
       ()
-      _dollar1
+      TypeSig::{
+        attrs: _dollar1,
+        vis: _dollar2,
+        name: _dollar4,
+        type_params: @list.empty(),
+        components: Error(EnumPayload(_dollar6)),
+      }
     },
   )
 }
 
 // file:///./stdlib.mbty
-// 60|    X SEP separated_nonempty_list(SEP, X) { $3.add($1) }
+// 5|    X { Some($1) }
 
 ///|
 fn yy_action_119(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[2].0 is YYObj__list_List_QualifiedName_(_dollar3)
-  guard _args[0].0 is YYObj_QualifiedName(_dollar1)
-  YYObj__list_List_QualifiedName_(
+  guard _args[0].0 is YYObj_Type(_dollar1)
+  YYObj_Option_Type_(
     {
       ()
-      _dollar3.add(_dollar1)
+      Some(_dollar1)
     },
   )
 }
 
 // file:///./stdlib.mbty
-// 59|    X { @list.singleton($1) }
+// 4|    { None }
 
 ///|
 fn yy_action_120(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[0].0 is YYObj_QualifiedName(_dollar1)
-  YYObj__list_List_QualifiedName_(
+  YYObj_Option_Type_(
     {
       ()
-      @list.singleton(_dollar1)
+      None
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 232|    uident { TypeParamWithConstraints::{name: $1, constraints: @list.empty()} }
+// 205|    attributes vis "struct" type_decl_name_with_params "{" record_decl_body "}" {
+// 206|    TypeSig::{attrs : $1, vis: $2, name: $4.0, type_params: $4.1, components: $6 }
+// 207|  }
 
 ///|
 fn yy_action_121(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[0].0 is YYObj_Name(_dollar1)
-  YYObj_TypeParamWithConstraints(
+  let _sub_action_0_result = yy_action_14(_last_pos, _args[0:0])
+  let _sub_action_1_result = yy_action_15(_last_pos, _args[0:0])
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _sub_action_1_result is YYObj_Visibility(_dollar2)
+  guard _args[1].0 is YYObj__Name___list_List_TypeParamNoConstraints__(_dollar4)
+  guard _args[3].0 is YYObj_TypeDefinition(_dollar6)
+  YYObj_TypeSig(
     {
       ()
-      TypeParamWithConstraints::{ name: _dollar1, constraints: @list.empty() }
+      TypeSig::{
+        attrs: _dollar1,
+        vis: _dollar2,
+        name: _dollar4.0,
+        type_params: _dollar4.1,
+        components: _dollar6,
+      }
     },
   )
 }
 
-// file:///./stdlib.mbty
-// 60|    X SEP separated_nonempty_list(SEP, X) { $3.add($1) }
+// file:///./mbti_parser.mbty
+// 287|    record_decl_constr {
+// 288|    Record(fields = @list.empty(), constr = Some($1))
+// 289|  }
 
 ///|
 fn yy_action_122(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[2].0 is YYObj__list_List_TypeParamWithConstraints_(_dollar3)
-  guard _args[0].0 is YYObj_TypeParamWithConstraints(_dollar1)
-  YYObj__list_List_TypeParamWithConstraints_(
+  guard _args[0].0 is YYObj_FuncSig(_dollar1)
+  YYObj_TypeDefinition(
     {
       ()
-      _dollar3.add(_dollar1)
+      Record(fields=@list.empty(), constr=Some(_dollar1))
     },
   )
 }
 
-// file:///./stdlib.mbty
-// 59|    X { @list.singleton($1) }
+// file:///./mbti_parser.mbty
+// 290|    record_decl_body_nonempty {
+// 291|    let (fields, constr) = $1
+// 292|    Record(fields~, constr~)
+// 293|  }
 
 ///|
 fn yy_action_123(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[0].0 is YYObj_TypeParamWithConstraints(_dollar1)
-  YYObj__list_List_TypeParamWithConstraints_(
+  guard _args[0].0 is YYObj___list_List_FieldDecl___FuncSig__(_dollar1)
+  YYObj_TypeDefinition(
     {
       ()
-      @list.singleton(_dollar1)
+      let (fields, constr) = _dollar1
+      Record(fields~, constr~)
     },
   )
 }
 
-// file:///./stdlib.mbty
-// 54|    { @list.empty() }
+// file:///./mbti_parser.mbty
+// 271|    attributes boption("mut") LIDENT ":" type_ { 
+// 272|    FieldDecl::{ name: FieldName::{ label: $3, loc : mk_loc($loc($3)) }, vis: Default, mut_: $2, ty: $5, loc: mk_loc($sloc), attrs: $1, doc: DocString::empty() } 
+// 273|  }
 
 ///|
 fn yy_action_124(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  YYObj__list_List_TypeParamWithConstraints_(
+  let _sub_action_0_result = yy_action_14(_last_pos, _args[0:0])
+  guard _args[1].0 is YYObj_String(_dollar3)
+  let _start_pos_of_item2 = _args[1].1
+  let _end_pos_of_item2 = _args[1].2
+  guard _args[0].0 is YYObj_Bool(_dollar2)
+  guard _args[3].0 is YYObj_Type(_dollar5)
+  let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
+  let _end_pos = if _args.length() == 0 {
+    _last_pos
+  } else {
+    _args[_args.length() - 1].2
+  }
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  YYObj_FieldDecl(
     {
       ()
-      @list.empty()
-    },
-  )
-}
-
-// file:///./mbti_parser.mbty
-// 200|    vis "trait" uident loption(preceded(":", separated_nonempty_list("+", qualified_uident))) "{" separated_nonempty_list(";", trait_method_sig) "}" { TraitSig::{vis: $1, name: $3, super_traits: $4, methods: $6} }
-
-///|
-fn yy_action_125(
-  _last_pos : @basic.Position,
+      FieldDecl::{
+        name: FieldName::{
+          label: _dollar3,
+          loc: mk_loc((_start_pos_of_item2, _end_pos_of_item2)),
+        },
+        vis: Default,
+        mut_: _dollar2,
+        ty: _dollar5,
+        loc: mk_loc((_symbol_start_pos, _end_pos)),
+        attrs: _dollar1,
+        doc: DocString::empty(),
+      }
+    },
+  )
+}
+
+// file:///./mbti_parser.mbty
+// 271|    attributes boption("mut") LIDENT ":" type_ { 
+// 272|    FieldDecl::{ name: FieldName::{ label: $3, loc : mk_loc($loc($3)) }, vis: Default, mut_: $2, ty: $5, loc: mk_loc($sloc), attrs: $1, doc: DocString::empty() } 
+// 273|  }
+
+///|
+fn yy_action_125(
+  _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_46(_last_pos, _args[0:0])
-  guard _sub_action_0_result is YYObj_Visibility(_dollar1)
-  guard _args[1].0 is YYObj_Name(_dollar3)
-  guard _args[2].0 is YYObj__list_List_QualifiedName_(_dollar4)
-  guard _args[4].0 is YYObj__list_List_TraitMethodSig_(_dollar6)
-  YYObj_TraitSig(
+  let _sub_action_0_result = yy_action_49(_last_pos, _args[0:1])
+  guard _args[2].0 is YYObj_String(_dollar3)
+  let _start_pos_of_item2 = _args[2].1
+  let _end_pos_of_item2 = _args[2].2
+  guard _args[1].0 is YYObj_Bool(_dollar2)
+  guard _args[4].0 is YYObj_Type(_dollar5)
+  let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
+  let _end_pos = if _args.length() == 0 {
+    _last_pos
+  } else {
+    _args[_args.length() - 1].2
+  }
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  YYObj_FieldDecl(
     {
       ()
-      TraitSig::{
-        vis: _dollar1,
-        name: _dollar3,
-        super_traits: _dollar4,
-        methods: _dollar6,
+      FieldDecl::{
+        name: FieldName::{
+          label: _dollar3,
+          loc: mk_loc((_start_pos_of_item2, _end_pos_of_item2)),
+        },
+        vis: Default,
+        mut_: _dollar2,
+        ty: _dollar5,
+        loc: mk_loc((_symbol_start_pos, _end_pos)),
+        attrs: _dollar1,
+        doc: DocString::empty(),
       }
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 174|    lident delimited("(", separated_list(",", trait_method_parameter), ")") "->" return_type boption(eq_underscore) { TraitMethodSig::{name: $1, params: $2, return_: $4, has_default: $5} }
+// 277|    attributes is_async FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident delimited("(", separated_list(",", parameter), ")") "->" return_type {
+// 278|    FuncSig::{
+// 279|      attrs : $1, is_async : $2, type_name: $5, name: $6, type_params: $4, params: $7, return_: $9
+// 280|    }
+// 281|  }
 
 ///|
 fn yy_action_126(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_127(_args[0].2, _args[1:4])
-  guard _args[0].0 is YYObj_Name(_dollar1)
-  guard _sub_action_0_result is YYObj__list_List_TraitMethodParameter_(_dollar2)
-  guard _args[5].0 is YYObj__Type__ErrorType_(_dollar4)
-  guard _args[6].0 is YYObj_Bool(_dollar5)
-  YYObj_TraitMethodSig(
+  let _sub_action_0_result = yy_action_49(_last_pos, _args[0:1])
+  let _sub_action_1_result = yy_action_94(_args[0].2, _args[1:2])
+  let _sub_action_2_result = yy_action_95(_args[5].2, _args[6:9])
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _sub_action_1_result is YYObj_Location_(_dollar2)
+  guard _args[4].0 is YYObj_Option_MethodSelfType_(_dollar5)
+  guard _args[5].0 is YYObj_Name(_dollar6)
+  guard _args[3].0 is YYObj__list_List_TypeParamWithConstraints_(_dollar4)
+  guard _sub_action_2_result is YYObj__list_List_Parameter_(_dollar7)
+  guard _args[10].0 is YYObj__Type__ErrorType_(_dollar9)
+  YYObj_FuncSig(
     {
       ()
-      TraitMethodSig::{
-        name: _dollar1,
-        params: _dollar2,
-        return_: _dollar4,
-        has_default: _dollar5,
+      FuncSig::{
+        attrs: _dollar1,
+        is_async: _dollar2,
+        type_name: _dollar5,
+        name: _dollar6,
+        type_params: _dollar4,
+        params: _dollar7,
+        return_: _dollar9,
       }
     },
   )
 }
 
-// file:///./stdlib.mbty
-// 40|    L X R { $2 }
+// file:///./mbti_parser.mbty
+// 277|    attributes is_async FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident delimited("(", separated_list(",", parameter), ")") "->" return_type {
+// 278|    FuncSig::{
+// 279|      attrs : $1, is_async : $2, type_name: $5, name: $6, type_params: $4, params: $7, return_: $9
+// 280|    }
+// 281|  }
 
 ///|
 fn yy_action_127(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[1].0 is YYObj__list_List_TraitMethodParameter_(_dollar2)
-  YYObj__list_List_TraitMethodParameter_(
+  let _sub_action_0_result = yy_action_49(_last_pos, _args[0:1])
+  let _sub_action_1_result = yy_action_97(_args[0].2, _args[1:1])
+  let _sub_action_2_result = yy_action_95(_args[4].2, _args[5:8])
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _sub_action_1_result is YYObj_Location_(_dollar2)
+  guard _args[3].0 is YYObj_Option_MethodSelfType_(_dollar5)
+  guard _args[4].0 is YYObj_Name(_dollar6)
+  guard _args[2].0 is YYObj__list_List_TypeParamWithConstraints_(_dollar4)
+  guard _sub_action_2_result is YYObj__list_List_Parameter_(_dollar7)
+  guard _args[9].0 is YYObj__Type__ErrorType_(_dollar9)
+  YYObj_FuncSig(
     {
       ()
-      _dollar2
+      FuncSig::{
+        attrs: _dollar1,
+        is_async: _dollar2,
+        type_name: _dollar5,
+        name: _dollar6,
+        type_params: _dollar4,
+        params: _dollar7,
+        return_: _dollar9,
+      }
     },
   )
 }
 
-// file:///./stdlib.mbty
-// 20|    X { true }
+// file:///./mbti_parser.mbty
+// 277|    attributes is_async FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident delimited("(", separated_list(",", parameter), ")") "->" return_type {
+// 278|    FuncSig::{
+// 279|      attrs : $1, is_async : $2, type_name: $5, name: $6, type_params: $4, params: $7, return_: $9
+// 280|    }
+// 281|  }
 
 ///|
 fn yy_action_128(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_129(_last_pos, _args[0:2])
-  YYObj_Bool(
+  let _sub_action_0_result = yy_action_14(_last_pos, _args[0:0])
+  let _sub_action_1_result = yy_action_94(_last_pos, _args[0:1])
+  let _sub_action_2_result = yy_action_95(_args[4].2, _args[5:8])
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _sub_action_1_result is YYObj_Location_(_dollar2)
+  guard _args[3].0 is YYObj_Option_MethodSelfType_(_dollar5)
+  guard _args[4].0 is YYObj_Name(_dollar6)
+  guard _args[2].0 is YYObj__list_List_TypeParamWithConstraints_(_dollar4)
+  guard _sub_action_2_result is YYObj__list_List_Parameter_(_dollar7)
+  guard _args[9].0 is YYObj__Type__ErrorType_(_dollar9)
+  YYObj_FuncSig(
     {
       ()
-      true
+      FuncSig::{
+        attrs: _dollar1,
+        is_async: _dollar2,
+        type_name: _dollar5,
+        name: _dollar6,
+        type_params: _dollar4,
+        params: _dollar7,
+        return_: _dollar9,
+      }
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 178|    "=" "_" {}
+// 162|   UIDENT "::" {
+// 163|  MethodSelfType::{ name : $1, is_object : false, loc : mk_loc($loc($1)) }
+// 164| }
 
 ///|
 fn yy_action_129(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  YYObj_Unit(())
+  guard _args[0].0 is YYObj_String(_dollar1)
+  let _start_pos_of_item0 = _args[0].1
+  let _end_pos_of_item0 = _args[0].2
+  YYObj_MethodSelfType(
+    {
+      ()
+      MethodSelfType::{
+        name: _dollar1,
+        is_object: false,
+        loc: mk_loc((_start_pos_of_item0, _end_pos_of_item0)),
+      }
+    },
+  )
 }
 
-// file:///./stdlib.mbty
-// 19|    { false }
+// file:///./mbti_parser.mbty
+// 165|   "&" UIDENT "::" {
+// 166|  MethodSelfType::{ name : $2, is_object : true, loc : mk_loc($loc($1)) }
+// 167| }
 
 ///|
 fn yy_action_130(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  YYObj_Bool(
+  guard _args[1].0 is YYObj_String(_dollar2)
+  let _start_pos_of_item0 = _args[0].1
+  let _end_pos_of_item0 = _args[0].2
+  YYObj_MethodSelfType(
     {
       ()
-      false
+      MethodSelfType::{
+        name: _dollar2,
+        is_object: true,
+        loc: mk_loc((_start_pos_of_item0, _end_pos_of_item0)),
+      }
     },
   )
 }
 
-// file:///./stdlib.mbty
-// 55|    separated_nonempty_list(SEP, X) { $1 }
+// file:///./mbti_parser.mbty
+// 277|    attributes is_async FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident delimited("(", separated_list(",", parameter), ")") "->" return_type {
+// 278|    FuncSig::{
+// 279|      attrs : $1, is_async : $2, type_name: $5, name: $6, type_params: $4, params: $7, return_: $9
+// 280|    }
+// 281|  }
 
 ///|
 fn yy_action_131(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[0].0 is YYObj__list_List_TraitMethodParameter_(_dollar1)
-  YYObj__list_List_TraitMethodParameter_(
+  let _sub_action_0_result = yy_action_14(_last_pos, _args[0:0])
+  let _sub_action_1_result = yy_action_97(_last_pos, _args[0:0])
+  let _sub_action_2_result = yy_action_95(_args[3].2, _args[4:7])
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _sub_action_1_result is YYObj_Location_(_dollar2)
+  guard _args[2].0 is YYObj_Option_MethodSelfType_(_dollar5)
+  guard _args[3].0 is YYObj_Name(_dollar6)
+  guard _args[1].0 is YYObj__list_List_TypeParamWithConstraints_(_dollar4)
+  guard _sub_action_2_result is YYObj__list_List_Parameter_(_dollar7)
+  guard _args[8].0 is YYObj__Type__ErrorType_(_dollar9)
+  YYObj_FuncSig(
     {
       ()
-      _dollar1
+      FuncSig::{
+        attrs: _dollar1,
+        is_async: _dollar2,
+        type_name: _dollar5,
+        name: _dollar6,
+        type_params: _dollar4,
+        params: _dollar7,
+        return_: _dollar9,
+      }
     },
   )
 }
 
-// file:///./mbti_parser.mbty
-// 306|    type_ { Positional($1) }
+// file:///./stdlib.mbty
+// 5|    X { Some($1) }
 
 ///|
 fn yy_action_132(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[0].0 is YYObj_Type(_dollar1)
-  YYObj_TraitMethodParameter(
+  guard _args[0].0 is YYObj_MethodSelfType(_dollar1)
+  YYObj_Option_MethodSelfType_(
     {
       ()
-      Positional(_dollar1)
+      Some(_dollar1)
     },
   )
 }
 
-// file:///./mbti_parser.mbty
-// 307|    post_label ":" type_ { Labelled($1, $3) }
+// file:///./stdlib.mbty
+// 4|    { None }
 
 ///|
 fn yy_action_133(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[0].0 is YYObj_Label(_dollar1)
-  guard _args[2].0 is YYObj_Type(_dollar3)
-  YYObj_TraitMethodParameter(
+  YYObj_Option_MethodSelfType_(
     {
       ()
-      Labelled(_dollar1, _dollar3)
+      None
     },
   )
 }
 
-// file:///./mbti_parser.mbty
-// 370|    POST_LABEL { Label::{name: $1, loc: mk_loc($sloc)} }
+// file:///./stdlib.mbty
+// 15|    X { $1 }
 
 ///|
 fn yy_action_134(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[0].0 is YYObj_String(_dollar1)
-  let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
-  let _end_pos = if _args.length() == 0 {
-    _last_pos
-  } else {
-    _args[_args.length() - 1].2
-  }
-  YYObj_Label(
+  guard _args[0].0 is YYObj__list_List_TypeParamWithConstraints_(_dollar1)
+  YYObj__list_List_TypeParamWithConstraints_(
     {
       ()
-      Label::{ name: _dollar1, loc: mk_loc((_symbol_start_pos, _end_pos)) }
+      _dollar1
     },
   )
 }
 
 // file:///./stdlib.mbty
-// 60|    X SEP separated_nonempty_list(SEP, X) { $3.add($1) }
+// 14|    { @list.empty() }
 
 ///|
 fn yy_action_135(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[2].0 is YYObj__list_List_TraitMethodParameter_(_dollar3)
-  guard _args[0].0 is YYObj_TraitMethodParameter(_dollar1)
-  YYObj__list_List_TraitMethodParameter_(
+  YYObj__list_List_TypeParamWithConstraints_(
     {
       ()
-      _dollar3.add(_dollar1)
+      @list.empty()
     },
   )
 }
 
-// file:///./stdlib.mbty
-// 59|    X { @list.singleton($1) }
+// file:///./mbti_parser.mbty
+// 296|    record_decl_field ";" record_decl_constr {
+// 297|    (@list.singleton($1), Some($3))
+// 298|  }
 
 ///|
 fn yy_action_136(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[0].0 is YYObj_TraitMethodParameter(_dollar1)
-  YYObj__list_List_TraitMethodParameter_(
+  guard _args[0].0 is YYObj_FieldDecl(_dollar1)
+  guard _args[2].0 is YYObj_FuncSig(_dollar3)
+  YYObj___list_List_FieldDecl___FuncSig__(
     {
       ()
-      @list.singleton(_dollar1)
+      (@list.singleton(_dollar1), Some(_dollar3))
     },
   )
 }
 
-// file:///./stdlib.mbty
-// 54|    { @list.empty() }
+// file:///./mbti_parser.mbty
+// 302|    record_decl_field ";" record_decl_body_nonempty {
+// 303|    let (fields, constr) = $3
+// 304|    (fields.add($1), constr)
+// 305|  }
 
 ///|
 fn yy_action_137(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  YYObj__list_List_TraitMethodParameter_(
+  guard _args[2].0 is YYObj___list_List_FieldDecl___FuncSig__(_dollar3)
+  guard _args[0].0 is YYObj_FieldDecl(_dollar1)
+  YYObj___list_List_FieldDecl___FuncSig__(
     {
       ()
-      @list.empty()
+      let (fields, constr) = _dollar3
+      (fields.add(_dollar1), constr)
     },
   )
 }
 
-// file:///./stdlib.mbty
-// 60|    X SEP separated_nonempty_list(SEP, X) { $3.add($1) }
+// file:///./mbti_parser.mbty
+// 299|    record_decl_field {
+// 300|    (@list.singleton($1), None)
+// 301|  }
 
 ///|
 fn yy_action_138(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[2].0 is YYObj__list_List_TraitMethodSig_(_dollar3)
-  guard _args[0].0 is YYObj_TraitMethodSig(_dollar1)
-  YYObj__list_List_TraitMethodSig_(
+  guard _args[0].0 is YYObj_FieldDecl(_dollar1)
+  YYObj___list_List_FieldDecl___FuncSig__(
     {
       ()
-      _dollar3.add(_dollar1)
+      (@list.singleton(_dollar1), None)
     },
   )
 }
 
-// file:///./stdlib.mbty
-// 59|    X { @list.singleton($1) }
+// file:///./mbti_parser.mbty
+// 284|    {
+// 285|    Record(fields = @list.empty(), constr = None)
+// 286|  }
 
 ///|
 fn yy_action_139(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[0].0 is YYObj_TraitMethodSig(_dollar1)
-  YYObj__list_List_TraitMethodSig_(
+  YYObj_TypeDefinition(
     {
       ()
-      @list.singleton(_dollar1)
+      Record(fields=@list.empty(), constr=None)
     },
   )
 }
 
-// file:///./stdlib.mbty
-// 60|    X SEP separated_nonempty_list(SEP, X) { $3.add($1) }
+// file:///./mbti_parser.mbty
+// 208|    attributes vis "struct" type_decl_name_with_params "(" separated_list(",", type_) ")" {
+// 209|    TypeSig::{attrs : $1, vis: $2, name: $4.0, type_params: $4.1, components: TupleStruct($6)}
+// 210|  }
 
 ///|
 fn yy_action_140(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[2].0 is YYObj__list_List_QualifiedName_(_dollar3)
-  guard _args[0].0 is YYObj_QualifiedName(_dollar1)
-  YYObj__list_List_QualifiedName_(
+  let _sub_action_0_result = yy_action_14(_last_pos, _args[0:0])
+  let _sub_action_1_result = yy_action_15(_last_pos, _args[0:0])
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _sub_action_1_result is YYObj_Visibility(_dollar2)
+  guard _args[1].0 is YYObj__Name___list_List_TypeParamNoConstraints__(_dollar4)
+  guard _args[3].0 is YYObj__list_List_Type_(_dollar6)
+  YYObj_TypeSig(
     {
       ()
-      _dollar3.add(_dollar1)
+      TypeSig::{
+        attrs: _dollar1,
+        vis: _dollar2,
+        name: _dollar4.0,
+        type_params: _dollar4.1,
+        components: TupleStruct(_dollar6),
+      }
     },
   )
 }
 
 // file:///./stdlib.mbty
-// 59|    X { @list.singleton($1) }
+// 55|    separated_nonempty_list(SEP, X) { $1 }
 
 ///|
 fn yy_action_141(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[0].0 is YYObj_QualifiedName(_dollar1)
-  YYObj__list_List_QualifiedName_(
+  guard _args[0].0 is YYObj__list_List_Type_(_dollar1)
+  YYObj__list_List_Type_(
     {
       ()
-      @list.singleton(_dollar1)
+      _dollar1
     },
   )
 }
 
 // file:///./stdlib.mbty
-// 15|    X { $1 }
+// 54|    { @list.empty() }
 
 ///|
 fn yy_action_142(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_143(_last_pos, _args[0:2])
-  guard _sub_action_0_result is YYObj__list_List_QualifiedName_(_dollar1)
-  YYObj__list_List_QualifiedName_(
+  YYObj__list_List_Type_(
     {
       ()
-      _dollar1
+      @list.empty()
     },
   )
 }
 
-// file:///./stdlib.mbty
-// 32|    L X { $2 }
+// file:///./mbti_parser.mbty
+// 211|    attributes vis "enum" type_decl_name_with_params "{" separated_list(";", enum_constructor) "}" {
+// 212|    TypeSig::{attrs : $1, vis: $2, name: $4.0, type_params: $4.1, components: Variant($6)}
+// 213|  }
 
 ///|
 fn yy_action_143(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[1].0 is YYObj__list_List_QualifiedName_(_dollar2)
-  YYObj__list_List_QualifiedName_(
+  let _sub_action_0_result = yy_action_14(_last_pos, _args[0:0])
+  let _sub_action_1_result = yy_action_15(_last_pos, _args[0:0])
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _sub_action_1_result is YYObj_Visibility(_dollar2)
+  guard _args[1].0 is YYObj__Name___list_List_TypeParamNoConstraints__(_dollar4)
+  guard _args[3].0 is YYObj__list_List_ConstrDecl_(_dollar6)
+  YYObj_TypeSig(
     {
       ()
-      _dollar2
+      TypeSig::{
+        attrs: _dollar1,
+        vis: _dollar2,
+        name: _dollar4.0,
+        type_params: _dollar4.1,
+        components: Variant(_dollar6),
+      }
     },
   )
 }
 
 // file:///./stdlib.mbty
-// 14|    { @list.empty() }
+// 55|    separated_nonempty_list(SEP, X) { $1 }
 
 ///|
 fn yy_action_144(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  YYObj__list_List_QualifiedName_(
+  guard _args[0].0 is YYObj__list_List_ConstrDecl_(_dollar1)
+  YYObj__list_List_ConstrDecl_(
     {
       ()
-      @list.empty()
+      _dollar1
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 201|    vis "trait" uident { TraitSig::{vis: $1, name: $3, super_traits: @list.empty(), methods: @list.empty()} }
+// 256|    attributes UIDENT option(delimited("(", separated_nonempty_list(",", constructor_param), ")")) option(eq_tag) { 
+// 257|    ConstrDecl::{name: ConstrName::{ name : $2, loc : mk_loc($loc($2)) }, args: $3, tag: $4, loc: mk_loc($sloc), attrs: $1, doc: DocString::empty()} 
+// 258|  }
 
 ///|
 fn yy_action_145(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_46(_last_pos, _args[0:0])
-  guard _sub_action_0_result is YYObj_Visibility(_dollar1)
-  guard _args[1].0 is YYObj_Name(_dollar3)
-  YYObj_TraitSig(
+  let _sub_action_0_result = yy_action_14(_last_pos, _args[0:0])
+  guard _args[0].0 is YYObj_String(_dollar2)
+  let _start_pos_of_item1 = _args[0].1
+  let _end_pos_of_item1 = _args[0].2
+  guard _args[1].0 is YYObj_Option__list_List_ConstrParam__(_dollar3)
+  guard _args[2].0 is YYObj_Option__String__Location__(_dollar4)
+  let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
+  let _end_pos = if _args.length() == 0 {
+    _last_pos
+  } else {
+    _args[_args.length() - 1].2
+  }
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  YYObj_ConstrDecl(
     {
       ()
-      TraitSig::{
-        vis: _dollar1,
-        name: _dollar3,
-        super_traits: @list.empty(),
-        methods: @list.empty(),
+      ConstrDecl::{
+        name: ConstrName::{
+          name: _dollar2,
+          loc: mk_loc((_start_pos_of_item1, _end_pos_of_item1)),
+        },
+        args: _dollar3,
+        tag: _dollar4,
+        loc: mk_loc((_symbol_start_pos, _end_pos)),
+        attrs: _dollar1,
+        doc: DocString::empty(),
       }
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 205|    vis "typealias" type_ "as" type_decl_name_with_params  { TypeAlias(vis=$1, name=$5.0, type_params=$5.1, type_=$3) }
+// 256|    attributes UIDENT option(delimited("(", separated_nonempty_list(",", constructor_param), ")")) option(eq_tag) { 
+// 257|    ConstrDecl::{name: ConstrName::{ name : $2, loc : mk_loc($loc($2)) }, args: $3, tag: $4, loc: mk_loc($sloc), attrs: $1, doc: DocString::empty()} 
+// 258|  }
 
 ///|
 fn yy_action_146(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_46(_last_pos, _args[0:0])
-  guard _sub_action_0_result is YYObj_Visibility(_dollar1)
-  guard _args[3].0 is YYObj__Name___list_List_TypeParamNoConstraints__(_dollar5)
-  guard _args[1].0 is YYObj_Type(_dollar3)
-  YYObj_AliasSig(
+  let _sub_action_0_result = yy_action_49(_last_pos, _args[0:1])
+  guard _args[1].0 is YYObj_String(_dollar2)
+  let _start_pos_of_item1 = _args[1].1
+  let _end_pos_of_item1 = _args[1].2
+  guard _args[2].0 is YYObj_Option__list_List_ConstrParam__(_dollar3)
+  guard _args[3].0 is YYObj_Option__String__Location__(_dollar4)
+  let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
+  let _end_pos = if _args.length() == 0 {
+    _last_pos
+  } else {
+    _args[_args.length() - 1].2
+  }
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  YYObj_ConstrDecl(
     {
       ()
-      TypeAlias(
-        vis=_dollar1,
-        name=_dollar5.0,
-        type_params=_dollar5.1,
-        type_=_dollar3,
-      )
-    },
-  )
-}
+      ConstrDecl::{
+        name: ConstrName::{
+          name: _dollar2,
+          loc: mk_loc((_start_pos_of_item1, _end_pos_of_item1)),
+        },
+        args: _dollar3,
+        tag: _dollar4,
+        loc: mk_loc((_symbol_start_pos, _end_pos)),
+        attrs: _dollar1,
+        doc: DocString::empty(),
+      }
+    },
+  )
+}
 
-// file:///./mbti_parser.mbty
-// 246|    "[" separated_list(",", type_param_no_constraints) "]" { $2 }
+// file:///./stdlib.mbty
+// 5|    X { Some($1) }
 
 ///|
 fn yy_action_147(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[1].0 is YYObj__list_List_TypeParamNoConstraints_(_dollar2)
-  YYObj__list_List_TypeParamNoConstraints_(
+  let _sub_action_0_result = yy_action_148(_last_pos, _args[0:2])
+  guard _sub_action_0_result is YYObj__String__Location_(_dollar1)
+  YYObj_Option__String__Location__(
     {
       ()
-      _dollar2
+      Some(_dollar1)
     },
   )
 }
 
-// file:///./stdlib.mbty
-// 55|    separated_nonempty_list(SEP, X) { $1 }
+// file:///./mbti_parser.mbty
+// 262|    "=" INT { ($2, mk_loc($loc($2))) }
 
 ///|
 fn yy_action_148(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[0].0 is YYObj__list_List_TypeParamNoConstraints_(_dollar1)
-  YYObj__list_List_TypeParamNoConstraints_(
+  guard _args[1].0 is YYObj_String(_dollar2)
+  let _start_pos_of_item1 = _args[1].1
+  let _end_pos_of_item1 = _args[1].2
+  YYObj__String__Location_(
     {
       ()
-      _dollar1
+      (_dollar2, mk_loc((_start_pos_of_item1, _end_pos_of_item1)))
     },
   )
 }
 
-// file:///./mbti_parser.mbty
-// 241|    uident { Name($1) }
+// file:///./stdlib.mbty
+// 4|    { None }
 
 ///|
 fn yy_action_149(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[0].0 is YYObj_Name(_dollar1)
-  YYObj_TypeParamNoConstraints(
+  YYObj_Option__String__Location__(
     {
       ()
-      Name(_dollar1)
+      None
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 242|    "_" { Underscore(mk_loc($sloc)) }
+// 266|    boption("mut") type_ { ConstrParam::{mut_: $1, ty: $2, label: None} }
 
 ///|
 fn yy_action_150(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
-  let _end_pos = if _args.length() == 0 {
-    _last_pos
-  } else {
-    _args[_args.length() - 1].2
-  }
-  YYObj_TypeParamNoConstraints(
+  guard _args[0].0 is YYObj_Bool(_dollar1)
+  guard _args[1].0 is YYObj_Type(_dollar2)
+  YYObj_ConstrParam(
     {
       ()
-      Underscore(mk_loc((_symbol_start_pos, _end_pos)))
+      ConstrParam::{ mut_: _dollar1, ty: _dollar2, label: None }
     },
   )
 }
 
-// file:///./stdlib.mbty
-// 60|    X SEP separated_nonempty_list(SEP, X) { $3.add($1) }
+// file:///./mbti_parser.mbty
+// 267|    boption("mut") post_label ":" type_ { ConstrParam::{mut_: $1, ty: $4, label: Some($2)} }
 
 ///|
 fn yy_action_151(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[2].0 is YYObj__list_List_TypeParamNoConstraints_(_dollar3)
-  guard _args[0].0 is YYObj_TypeParamNoConstraints(_dollar1)
-  YYObj__list_List_TypeParamNoConstraints_(
+  guard _args[0].0 is YYObj_Bool(_dollar1)
+  guard _args[3].0 is YYObj_Type(_dollar4)
+  guard _args[1].0 is YYObj_Label(_dollar2)
+  YYObj_ConstrParam(
     {
       ()
-      _dollar3.add(_dollar1)
+      ConstrParam::{ mut_: _dollar1, ty: _dollar4, label: Some(_dollar2) }
     },
   )
 }
 
 // file:///./stdlib.mbty
-// 59|    X { @list.singleton($1) }
+// 60|    X SEP separated_nonempty_list(SEP, X) { $3.add($1) }
 
 ///|
 fn yy_action_152(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[0].0 is YYObj_TypeParamNoConstraints(_dollar1)
-  YYObj__list_List_TypeParamNoConstraints_(
+  guard _args[2].0 is YYObj__list_List_ConstrParam_(_dollar3)
+  guard _args[0].0 is YYObj_ConstrParam(_dollar1)
+  YYObj__list_List_ConstrParam_(
     {
       ()
-      @list.singleton(_dollar1)
+      _dollar3.add(_dollar1)
     },
   )
 }
 
 // file:///./stdlib.mbty
-// 54|    { @list.empty() }
+// 59|    X { @list.singleton($1) }
 
 ///|
 fn yy_action_153(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  YYObj__list_List_TypeParamNoConstraints_(
+  guard _args[0].0 is YYObj_ConstrParam(_dollar1)
+  YYObj__list_List_ConstrParam_(
     {
       ()
-      @list.empty()
+      @list.singleton(_dollar1)
     },
   )
 }
 
-// file:///./mbti_parser.mbty
-// 251|    type_params_no_constraints { $1 }
+// file:///./stdlib.mbty
+// 5|    X { Some($1) }
 
 ///|
 fn yy_action_154(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[0].0 is YYObj__list_List_TypeParamNoConstraints_(_dollar1)
-  YYObj__list_List_TypeParamNoConstraints_(
+  let _sub_action_0_result = yy_action_155(_last_pos, _args[0:3])
+  guard _sub_action_0_result is YYObj__list_List_ConstrParam_(_dollar1)
+  YYObj_Option__list_List_ConstrParam__(
     {
       ()
-      _dollar1
+      Some(_dollar1)
     },
   )
 }
 
-// file:///./mbti_parser.mbty
-// 259|    uident optional_type_params_no_constraints { ($1, $2) }
+// file:///./stdlib.mbty
+// 40|    L X R { $2 }
 
 ///|
 fn yy_action_155(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[0].0 is YYObj_Name(_dollar1)
-  guard _args[1].0 is YYObj__list_List_TypeParamNoConstraints_(_dollar2)
-  YYObj__Name___list_List_TypeParamNoConstraints__(
+  guard _args[1].0 is YYObj__list_List_ConstrParam_(_dollar2)
+  YYObj__list_List_ConstrParam_(
     {
       ()
-      (_dollar1, _dollar2)
+      _dollar2
     },
   )
 }
 
-// file:///./mbti_parser.mbty
-// 250|    { @list.empty() }
+// file:///./stdlib.mbty
+// 20|    X { true }
 
 ///|
 fn yy_action_156(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  YYObj__list_List_TypeParamNoConstraints_(
+  YYObj_Bool(
     {
       ()
-      @list.empty()
+      true
     },
   )
 }
 
-// file:///./mbti_parser.mbty
-// 273|    is_async "(" type_ "," ioption(separated_nonempty_list(",", type_)) ")" "->" return_type { Arrow(args=$5.unwrap_or(@list.empty()).add($3), res=$8.0, err=$8.1, is_async=$1, loc=mk_loc($sloc)) }
+// file:///./stdlib.mbty
+// 19|    { false }
 
 ///|
 fn yy_action_157(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_158(_last_pos, _args[0:1])
-  let _sub_action_1_result = yy_action_159(_args[3].2, _args[4:4])
-  guard _sub_action_1_result is YYObj_Option__list_List_Type__(_dollar5)
-  guard _args[2].0 is YYObj_Type(_dollar3)
-  guard _args[6].0 is YYObj__Type__ErrorType_(_dollar8)
-  guard _sub_action_0_result is YYObj_Location_(_dollar1)
-  let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
-  let _end_pos = if _args.length() == 0 {
-    _last_pos
-  } else {
-    _args[_args.length() - 1].2
-  }
-  YYObj_Type(
+  YYObj_Bool(
     {
       ()
-      Arrow(
-        args=_dollar5.unwrap_or(@list.empty()).add(_dollar3),
-        res=_dollar8.0,
-        err=_dollar8.1,
-        is_async=_dollar1,
-        loc=mk_loc((_symbol_start_pos, _end_pos)),
-      )
+      false
     },
   )
 }
 
-// file:///./mbti_parser.mbty
-// 273|    is_async "(" type_ "," ioption(separated_nonempty_list(",", type_)) ")" "->" return_type { Arrow(args=$5.unwrap_or(@list.empty()).add($3), res=$8.0, err=$8.1, is_async=$1, loc=mk_loc($sloc)) }
+// file:///./stdlib.mbty
+// 4|    { None }
 
 ///|
-fn yy_action_160(
+fn yy_action_158(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_158(_last_pos, _args[0:1])
-  let _sub_action_1_result = yy_action_161(_args[3].2, _args[4:5])
-  guard _sub_action_1_result is YYObj_Option__list_List_Type__(_dollar5)
-  guard _args[2].0 is YYObj_Type(_dollar3)
-  guard _args[7].0 is YYObj__Type__ErrorType_(_dollar8)
-  guard _sub_action_0_result is YYObj_Location_(_dollar1)
-  let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
-  let _end_pos = if _args.length() == 0 {
-    _last_pos
-  } else {
-    _args[_args.length() - 1].2
-  }
-  YYObj_Type(
+  YYObj_Option__list_List_ConstrParam__(
     {
       ()
-      Arrow(
-        args=_dollar5.unwrap_or(@list.empty()).add(_dollar3),
-        res=_dollar8.0,
-        err=_dollar8.1,
-        is_async=_dollar1,
-        loc=mk_loc((_symbol_start_pos, _end_pos)),
-      )
+      None
     },
   )
 }
 
-// file:///./mbti_parser.mbty
-// 275|    is_async "(" type_ ")" "->" return_type { Arrow(args=@list.singleton($3), res=$6.0, err=$6.1, is_async=$1, loc=mk_loc($sloc)) }
+// file:///./stdlib.mbty
+// 60|    X SEP separated_nonempty_list(SEP, X) { $3.add($1) }
 
 ///|
-fn yy_action_162(
+fn yy_action_159(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_158(_last_pos, _args[0:1])
-  guard _args[2].0 is YYObj_Type(_dollar3)
-  guard _args[5].0 is YYObj__Type__ErrorType_(_dollar6)
-  guard _sub_action_0_result is YYObj_Location_(_dollar1)
-  let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
-  let _end_pos = if _args.length() == 0 {
-    _last_pos
-  } else {
-    _args[_args.length() - 1].2
-  }
-  YYObj_Type(
+  guard _args[2].0 is YYObj__list_List_ConstrDecl_(_dollar3)
+  guard _args[0].0 is YYObj_ConstrDecl(_dollar1)
+  YYObj__list_List_ConstrDecl_(
     {
       ()
-      Arrow(
-        args=@list.singleton(_dollar3),
-        res=_dollar6.0,
-        err=_dollar6.1,
-        is_async=_dollar1,
-        loc=mk_loc((_symbol_start_pos, _end_pos)),
-      )
+      _dollar3.add(_dollar1)
     },
   )
 }
 
-// file:///./mbti_parser.mbty
-// 266|    qualified_uident_ optional_type_arguments { Name(constr_id=$1, tys=$2, loc=mk_loc($sloc)) }
+// file:///./stdlib.mbty
+// 59|    X { @list.singleton($1) }
 
 ///|
-fn yy_action_163(
+fn yy_action_160(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[0].0 is YYObj_ConstrId(_dollar1)
-  guard _args[1].0 is YYObj__list_List_Type_(_dollar2)
-  let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
-  let _end_pos = if _args.length() == 0 {
-    _last_pos
-  } else {
-    _args[_args.length() - 1].2
-  }
-  YYObj_Type(
+  guard _args[0].0 is YYObj_ConstrDecl(_dollar1)
+  YYObj__list_List_ConstrDecl_(
     {
       ()
-      Name(
-        constr_id=_dollar1,
-        tys=_dollar2,
-        loc=mk_loc((_symbol_start_pos, _end_pos)),
-      )
+      @list.singleton(_dollar1)
     },
   )
 }
 
-// file:///./mbti_parser.mbty
-// 293|    delimited("[", separated_nonempty_list(",", type_), "]") { $1 }
+// file:///./stdlib.mbty
+// 54|    { @list.empty() }
 
 ///|
-fn yy_action_164(
+fn yy_action_161(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_165(_last_pos, _args[0:3])
-  guard _sub_action_0_result is YYObj__list_List_Type_(_dollar1)
-  YYObj__list_List_Type_(
+  YYObj__list_List_ConstrDecl_(
     {
       ()
-      _dollar1
+      @list.empty()
     },
   )
 }
 
-// file:///./stdlib.mbty
-// 40|    L X R { $2 }
+// file:///./mbti_parser.mbty
+// 322|    "[" separated_list(",", type_param_no_constraints) "]" { $2 }
 
 ///|
-fn yy_action_165(
+fn yy_action_162(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[1].0 is YYObj__list_List_Type_(_dollar2)
-  YYObj__list_List_Type_(
+  guard _args[1].0 is YYObj__list_List_TypeParamNoConstraints_(_dollar2)
+  YYObj__list_List_TypeParamNoConstraints_(
     {
       ()
       _dollar2
@@ -3809,317 +4608,248 @@ fn yy_action_165(
   )
 }
 
-// file:///./mbti_parser.mbty
-// 273|    is_async "(" type_ "," ioption(separated_nonempty_list(",", type_)) ")" "->" return_type { Arrow(args=$5.unwrap_or(@list.empty()).add($3), res=$8.0, err=$8.1, is_async=$1, loc=mk_loc($sloc)) }
+// file:///./stdlib.mbty
+// 55|    separated_nonempty_list(SEP, X) { $1 }
 
 ///|
-fn yy_action_166(
+fn yy_action_163(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_167(_last_pos, _args[0:0])
-  let _sub_action_1_result = yy_action_161(_args[2].2, _args[3:4])
-  guard _sub_action_1_result is YYObj_Option__list_List_Type__(_dollar5)
-  guard _args[1].0 is YYObj_Type(_dollar3)
-  guard _args[6].0 is YYObj__Type__ErrorType_(_dollar8)
-  guard _sub_action_0_result is YYObj_Location_(_dollar1)
-  let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
-  let _end_pos = if _args.length() == 0 {
-    _last_pos
-  } else {
-    _args[_args.length() - 1].2
-  }
-  YYObj_Type(
+  guard _args[0].0 is YYObj__list_List_TypeParamNoConstraints_(_dollar1)
+  YYObj__list_List_TypeParamNoConstraints_(
     {
       ()
-      Arrow(
-        args=_dollar5.unwrap_or(@list.empty()).add(_dollar3),
-        res=_dollar8.0,
-        err=_dollar8.1,
-        is_async=_dollar1,
-        loc=mk_loc((_symbol_start_pos, _end_pos)),
-      )
+      _dollar1
     },
   )
 }
 
-// file:///./stdlib.mbty
-// 10|    X { Some($1) }
+// file:///./mbti_parser.mbty
+// 317|    uident { Name($1) }
 
 ///|
-fn yy_action_161(
+fn yy_action_164(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[0].0 is YYObj__list_List_Type_(_dollar1)
-  YYObj_Option__list_List_Type__(
+  guard _args[0].0 is YYObj_Name(_dollar1)
+  YYObj_TypeParamNoConstraints(
     {
       ()
-      Some(_dollar1)
+      Name(_dollar1)
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 264|    "(" type_ "," separated_nonempty_list(",", type_) ")" { Tuple(tys=$4.add($2), loc=mk_loc($sloc)) }
+// 318|    "_" { Underscore(mk_loc($sloc)) }
 
 ///|
-fn yy_action_168(
+fn yy_action_165(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[3].0 is YYObj__list_List_Type_(_dollar4)
-  guard _args[1].0 is YYObj_Type(_dollar2)
   let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
   let _end_pos = if _args.length() == 0 {
     _last_pos
   } else {
     _args[_args.length() - 1].2
   }
-  YYObj_Type(
+  YYObj_TypeParamNoConstraints(
     {
       ()
-      Tuple(
-        tys=_dollar4.add(_dollar2),
-        loc=mk_loc((_symbol_start_pos, _end_pos)),
-      )
+      Underscore(mk_loc((_symbol_start_pos, _end_pos)))
     },
   )
 }
 
-// file:///./mbti_parser.mbty
-// 273|    is_async "(" type_ "," ioption(separated_nonempty_list(",", type_)) ")" "->" return_type { Arrow(args=$5.unwrap_or(@list.empty()).add($3), res=$8.0, err=$8.1, is_async=$1, loc=mk_loc($sloc)) }
+// file:///./stdlib.mbty
+// 60|    X SEP separated_nonempty_list(SEP, X) { $3.add($1) }
 
 ///|
-fn yy_action_169(
+fn yy_action_166(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_167(_last_pos, _args[0:0])
-  let _sub_action_1_result = yy_action_159(_args[2].2, _args[3:3])
-  guard _sub_action_1_result is YYObj_Option__list_List_Type__(_dollar5)
-  guard _args[1].0 is YYObj_Type(_dollar3)
-  guard _args[5].0 is YYObj__Type__ErrorType_(_dollar8)
-  guard _sub_action_0_result is YYObj_Location_(_dollar1)
-  let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
-  let _end_pos = if _args.length() == 0 {
-    _last_pos
-  } else {
-    _args[_args.length() - 1].2
-  }
-  YYObj_Type(
+  guard _args[2].0 is YYObj__list_List_TypeParamNoConstraints_(_dollar3)
+  guard _args[0].0 is YYObj_TypeParamNoConstraints(_dollar1)
+  YYObj__list_List_TypeParamNoConstraints_(
     {
       ()
-      Arrow(
-        args=_dollar5.unwrap_or(@list.empty()).add(_dollar3),
-        res=_dollar8.0,
-        err=_dollar8.1,
-        is_async=_dollar1,
-        loc=mk_loc((_symbol_start_pos, _end_pos)),
-      )
+      _dollar3.add(_dollar1)
     },
   )
 }
 
 // file:///./stdlib.mbty
-// 9|    { None }
+// 59|    X { @list.singleton($1) }
 
 ///|
-fn yy_action_159(
+fn yy_action_167(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  YYObj_Option__list_List_Type__(
+  guard _args[0].0 is YYObj_TypeParamNoConstraints(_dollar1)
+  YYObj__list_List_TypeParamNoConstraints_(
     {
       ()
-      None
+      @list.singleton(_dollar1)
     },
   )
 }
 
-// file:///./mbti_parser.mbty
-// 275|    is_async "(" type_ ")" "->" return_type { Arrow(args=@list.singleton($3), res=$6.0, err=$6.1, is_async=$1, loc=mk_loc($sloc)) }
+// file:///./stdlib.mbty
+// 54|    { @list.empty() }
 
 ///|
-fn yy_action_170(
+fn yy_action_168(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_167(_last_pos, _args[0:0])
-  guard _args[1].0 is YYObj_Type(_dollar3)
-  guard _args[4].0 is YYObj__Type__ErrorType_(_dollar6)
-  guard _sub_action_0_result is YYObj_Location_(_dollar1)
-  let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
-  let _end_pos = if _args.length() == 0 {
-    _last_pos
-  } else {
-    _args[_args.length() - 1].2
-  }
-  YYObj_Type(
+  YYObj__list_List_TypeParamNoConstraints_(
     {
       ()
-      Arrow(
-        args=@list.singleton(_dollar3),
-        res=_dollar6.0,
-        err=_dollar6.1,
-        is_async=_dollar1,
-        loc=mk_loc((_symbol_start_pos, _end_pos)),
-      )
+      @list.empty()
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 265|    "(" type_ ")" { $2 }
+// 327|    type_params_no_constraints { $1 }
 
 ///|
-fn yy_action_171(
+fn yy_action_169(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[1].0 is YYObj_Type(_dollar2)
-  YYObj_Type(
+  guard _args[0].0 is YYObj__list_List_TypeParamNoConstraints_(_dollar1)
+  YYObj__list_List_TypeParamNoConstraints_(
     {
       ()
-      _dollar2
+      _dollar1
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 263|    simple_type "?" { Option(ty=$1, loc=mk_loc($sloc), question_loc=mk_loc($loc($2))) }
+// 335|    uident optional_type_params_no_constraints { ($1, $2) }
 
 ///|
-fn yy_action_172(
+fn yy_action_170(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[0].0 is YYObj_Type(_dollar1)
-  let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
-  let _end_pos = if _args.length() == 0 {
-    _last_pos
-  } else {
-    _args[_args.length() - 1].2
-  }
-  let _start_pos_of_item1 = _args[1].1
-  let _end_pos_of_item1 = _args[1].2
-  YYObj_Type(
+  guard _args[0].0 is YYObj_Name(_dollar1)
+  guard _args[1].0 is YYObj__list_List_TypeParamNoConstraints_(_dollar2)
+  YYObj__Name___list_List_TypeParamNoConstraints__(
     {
       ()
-      Option(
-        ty=_dollar1,
-        loc=mk_loc((_symbol_start_pos, _end_pos)),
-        question_loc=mk_loc((_start_pos_of_item1, _end_pos_of_item1)),
-      )
+      (_dollar1, _dollar2)
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 281|    simple_type "raise" error_type { ($1, ErrorType(ty = $3)) }
+// 326|    { @list.empty() }
 
 ///|
-fn yy_action_173(
+fn yy_action_171(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[0].0 is YYObj_Type(_dollar1)
-  guard _args[2].0 is YYObj_Type(_dollar3)
-  YYObj__Type__ErrorType_(
+  YYObj__list_List_TypeParamNoConstraints_(
     {
       ()
-      (_dollar1, ErrorType(ty=_dollar3))
+      @list.empty()
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 282|    simple_type "raise" "?" {
-// 283|    let fake_error : Type = Name(constr_id={ id : QualifiedIdent::Ident(name="Error"), loc :@syntax.no_location }, tys=@list.empty(), loc=@syntax.no_location)
-// 284|    ($1, MaybeError(ty=fake_error)) 
-// 285|  }
+// 217|    attributes vis "impl" type_params_with_constraints qualified_uident "for" type_ {
+// 218|    ImplSig::{type_params : $4, trait_name : $5, type_ : $7, attrs : $1}
+// 219|  }
 
 ///|
-fn yy_action_174(
+fn yy_action_172(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[0].0 is YYObj_Type(_dollar1)
-  YYObj__Type__ErrorType_(
+  let _sub_action_0_result = yy_action_14(_last_pos, _args[0:0])
+  let _sub_action_1_result = yy_action_15(_last_pos, _args[0:0])
+  guard _args[1].0 is YYObj__list_List_TypeParamWithConstraints_(_dollar4)
+  guard _args[2].0 is YYObj_QualifiedName(_dollar5)
+  guard _args[4].0 is YYObj_Type(_dollar7)
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  YYObj_ImplSig(
     {
       ()
-      let fake_error : Type = Name(
-        constr_id={
-          id: QualifiedIdent::Ident(name="Error"),
-          loc: @syntax.no_location,
-        },
-        tys=@list.empty(),
-        loc=@syntax.no_location,
-      )
-      (_dollar1, MaybeError(ty=fake_error))
+      ImplSig::{
+        type_params: _dollar4,
+        trait_name: _dollar5,
+        type_: _dollar7,
+        attrs: _dollar1,
+      }
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 289|    qualified_uident_ { Name(constr_id=$1, tys=@list.empty(), loc=mk_loc($sloc)) }
+// 220|    attributes vis "impl" qualified_uident "for" type_ { 
+// 221|    ImplSig::{type_params : @list.empty(), trait_name : $4, type_ : $6, attrs : $1}
+// 222|  }
 
 ///|
-fn yy_action_175(
+fn yy_action_173(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[0].0 is YYObj_ConstrId(_dollar1)
-  let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
-  let _end_pos = if _args.length() == 0 {
-    _last_pos
-  } else {
-    _args[_args.length() - 1].2
-  }
-  YYObj_Type(
+  let _sub_action_0_result = yy_action_14(_last_pos, _args[0:0])
+  let _sub_action_1_result = yy_action_15(_last_pos, _args[0:0])
+  guard _args[1].0 is YYObj_QualifiedName(_dollar4)
+  guard _args[3].0 is YYObj_Type(_dollar6)
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  YYObj_ImplSig(
     {
       ()
-      Name(
-        constr_id=_dollar1,
-        tys=@list.empty(),
-        loc=mk_loc((_symbol_start_pos, _end_pos)),
-      )
+      ImplSig::{
+        type_params: @list.empty(),
+        trait_name: _dollar4,
+        type_: _dollar6,
+        attrs: _dollar1,
+      }
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 280|    simple_type "raise" { ($1, DefaultErrorType(loc=mk_loc($loc($2)))) }
+// 313|    "[" separated_list(",", type_param_with_constraints) "]" { $2 }
 
 ///|
-fn yy_action_176(
+fn yy_action_174(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[0].0 is YYObj_Type(_dollar1)
-  let _start_pos_of_item1 = _args[1].1
-  let _end_pos_of_item1 = _args[1].2
-  YYObj__Type__ErrorType_(
+  guard _args[1].0 is YYObj__list_List_TypeParamWithConstraints_(_dollar2)
+  YYObj__list_List_TypeParamWithConstraints_(
     {
       ()
-      (
-        _dollar1,
-        DefaultErrorType(loc=mk_loc((_start_pos_of_item1, _end_pos_of_item1))),
-      )
+      _dollar2
     },
   )
 }
 
-// file:///./mbti_parser.mbty
-// 272|    simple_type { $1 }
+// file:///./stdlib.mbty
+// 55|    separated_nonempty_list(SEP, X) { $1 }
 
 ///|
-fn yy_action_177(
+fn yy_action_175(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[0].0 is YYObj_Type(_dollar1)
-  YYObj_Type(
+  guard _args[0].0 is YYObj__list_List_TypeParamWithConstraints_(_dollar1)
+  YYObj__list_List_TypeParamWithConstraints_(
     {
       ()
       _dollar1
@@ -4128,48 +4858,36 @@ fn yy_action_177(
 }
 
 // file:///./mbti_parser.mbty
-// 274|    is_async "(" ")" "->" return_type { Arrow(args=@list.empty(), res=$5.0, err=$5.1, is_async=$1, loc=mk_loc($sloc)) }
+// 309|    uident ":" separated_nonempty_list("+", type_constraint) { TypeParamWithConstraints::{name: $1, constraints: $3} }
 
 ///|
-fn yy_action_178(
+fn yy_action_176(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_167(_last_pos, _args[0:0])
-  guard _args[3].0 is YYObj__Type__ErrorType_(_dollar5)
-  guard _sub_action_0_result is YYObj_Location_(_dollar1)
-  let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
-  let _end_pos = if _args.length() == 0 {
-    _last_pos
-  } else {
-    _args[_args.length() - 1].2
-  }
-  YYObj_Type(
+  guard _args[0].0 is YYObj_Name(_dollar1)
+  guard _args[2].0 is YYObj__list_List_QualifiedName_(_dollar3)
+  YYObj_TypeParamWithConstraints(
     {
       ()
-      Arrow(
-        args=@list.empty(),
-        res=_dollar5.0,
-        err=_dollar5.1,
-        is_async=_dollar1,
-        loc=mk_loc((_symbol_start_pos, _end_pos)),
-      )
+      TypeParamWithConstraints::{ name: _dollar1, constraints: _dollar3 }
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 344|    { None }
+// 331|    qualified_uident { $1 }
 
 ///|
-fn yy_action_167(
+fn yy_action_177(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  YYObj_Location_(
+  guard _args[0].0 is YYObj_QualifiedName(_dollar1)
+  YYObj_QualifiedName(
     {
       ()
-      None
+      _dollar1
     },
   )
 }
@@ -4178,13 +4896,13 @@ fn yy_action_167(
 // 60|    X SEP separated_nonempty_list(SEP, X) { $3.add($1) }
 
 ///|
-fn yy_action_179(
+fn yy_action_178(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[2].0 is YYObj__list_List_Type_(_dollar3)
-  guard _args[0].0 is YYObj_Type(_dollar1)
-  YYObj__list_List_Type_(
+  guard _args[2].0 is YYObj__list_List_QualifiedName_(_dollar3)
+  guard _args[0].0 is YYObj_QualifiedName(_dollar1)
+  YYObj__list_List_QualifiedName_(
     {
       ()
       _dollar3.add(_dollar1)
@@ -4196,12 +4914,12 @@ fn yy_action_179(
 // 59|    X { @list.singleton($1) }
 
 ///|
-fn yy_action_180(
+fn yy_action_179(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[0].0 is YYObj_Type(_dollar1)
-  YYObj__list_List_Type_(
+  guard _args[0].0 is YYObj_QualifiedName(_dollar1)
+  YYObj__list_List_QualifiedName_(
     {
       ()
       @list.singleton(_dollar1)
@@ -4210,260 +4928,332 @@ fn yy_action_180(
 }
 
 // file:///./mbti_parser.mbty
-// 294|     { @list.empty() }
+// 308|    uident { TypeParamWithConstraints::{name: $1, constraints: @list.empty()} }
 
 ///|
-fn yy_action_181(
+fn yy_action_180(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  YYObj__list_List_Type_(
+  guard _args[0].0 is YYObj_Name(_dollar1)
+  YYObj_TypeParamWithConstraints(
     {
       ()
-      @list.empty()
+      TypeParamWithConstraints::{ name: _dollar1, constraints: @list.empty() }
     },
   )
 }
 
-// file:///./mbti_parser.mbty
-// 267|    "&" qualified_uident_ { Object($2) }
+// file:///./stdlib.mbty
+// 60|    X SEP separated_nonempty_list(SEP, X) { $3.add($1) }
 
 ///|
-fn yy_action_182(
+fn yy_action_181(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[1].0 is YYObj_ConstrId(_dollar2)
-  YYObj_Type(
+  guard _args[2].0 is YYObj__list_List_TypeParamWithConstraints_(_dollar3)
+  guard _args[0].0 is YYObj_TypeParamWithConstraints(_dollar1)
+  YYObj__list_List_TypeParamWithConstraints_(
     {
       ()
-      Object(_dollar2)
+      _dollar3.add(_dollar1)
     },
   )
 }
 
-// file:///./mbti_parser.mbty
-// 268|    "_" { Any(loc=mk_loc($sloc)) }
+// file:///./stdlib.mbty
+// 59|    X { @list.singleton($1) }
 
 ///|
-fn yy_action_183(
+fn yy_action_182(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
-  let _end_pos = if _args.length() == 0 {
-    _last_pos
-  } else {
-    _args[_args.length() - 1].2
-  }
-  YYObj_Type(
+  guard _args[0].0 is YYObj_TypeParamWithConstraints(_dollar1)
+  YYObj__list_List_TypeParamWithConstraints_(
     {
       ()
-      Any(loc=mk_loc((_symbol_start_pos, _end_pos)))
+      @list.singleton(_dollar1)
     },
   )
 }
 
-// file:///./mbti_parser.mbty
-// 274|    is_async "(" ")" "->" return_type { Arrow(args=@list.empty(), res=$5.0, err=$5.1, is_async=$1, loc=mk_loc($sloc)) }
+// file:///./stdlib.mbty
+// 54|    { @list.empty() }
 
 ///|
-fn yy_action_184(
+fn yy_action_183(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_158(_last_pos, _args[0:1])
-  guard _args[4].0 is YYObj__Type__ErrorType_(_dollar5)
-  guard _sub_action_0_result is YYObj_Location_(_dollar1)
-  let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
-  let _end_pos = if _args.length() == 0 {
-    _last_pos
-  } else {
-    _args[_args.length() - 1].2
-  }
-  YYObj_Type(
+  YYObj__list_List_TypeParamWithConstraints_(
     {
       ()
-      Arrow(
-        args=@list.empty(),
-        res=_dollar5.0,
-        err=_dollar5.1,
-        is_async=_dollar1,
-        loc=mk_loc((_symbol_start_pos, _end_pos)),
-      )
+      @list.empty()
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 343|    "async" { Some(mk_loc($loc($1))) }
+// 226|    attributes vis "trait" uident loption(preceded(":", separated_nonempty_list("+", qualified_uident))) "{" separated_nonempty_list(";", trait_method_sig) "}" { 
+// 227|    TraitSig::{ attrs : $1, vis: $2, name: $4, super_traits: $5, methods: $7} 
+// 228|  }
 
 ///|
-fn yy_action_158(
+fn yy_action_184(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  let _start_pos_of_item0 = _args[0].1
-  let _end_pos_of_item0 = _args[0].2
-  YYObj_Location_(
+  let _sub_action_0_result = yy_action_14(_last_pos, _args[0:0])
+  let _sub_action_1_result = yy_action_15(_last_pos, _args[0:0])
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _sub_action_1_result is YYObj_Visibility(_dollar2)
+  guard _args[1].0 is YYObj_Name(_dollar4)
+  guard _args[2].0 is YYObj__list_List_QualifiedName_(_dollar5)
+  guard _args[4].0 is YYObj__list_List_TraitMethodSig_(_dollar7)
+  YYObj_TraitSig(
     {
       ()
-      Some(mk_loc((_start_pos_of_item0, _end_pos_of_item0)))
+      TraitSig::{
+        attrs: _dollar1,
+        vis: _dollar2,
+        name: _dollar4,
+        super_traits: _dollar5,
+        methods: _dollar7,
+      }
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 279|    type_ { ($1, NoErrorType) }
+// 182|    attributes lident delimited("(", separated_list(",", parameter), ")") "->" return_type boption(eq_underscore) { 
+// 183|    TraitMethodSig::{ attrs : $1, name: $2, params: $3, return_: $5, has_default: $6} 
+// 184|  }
 
 ///|
 fn yy_action_185(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[0].0 is YYObj_Type(_dollar1)
-  YYObj__Type__ErrorType_(
+  let _sub_action_0_result = yy_action_14(_last_pos, _args[0:0])
+  let _sub_action_1_result = yy_action_95(_args[0].2, _args[1:4])
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _args[0].0 is YYObj_Name(_dollar2)
+  guard _sub_action_1_result is YYObj__list_List_Parameter_(_dollar3)
+  guard _args[5].0 is YYObj__Type__ErrorType_(_dollar5)
+  guard _args[6].0 is YYObj_Bool(_dollar6)
+  YYObj_TraitMethodSig(
     {
       ()
-      (_dollar1, NoErrorType)
+      TraitMethodSig::{
+        attrs: _dollar1,
+        name: _dollar2,
+        params: _dollar3,
+        return_: _dollar5,
+        has_default: _dollar6,
+      }
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 353|    UIDENT { ConstrId::{ id: Ident(name=$1), loc: mk_loc($sloc)} }
+// 182|    attributes lident delimited("(", separated_list(",", parameter), ")") "->" return_type boption(eq_underscore) { 
+// 183|    TraitMethodSig::{ attrs : $1, name: $2, params: $3, return_: $5, has_default: $6} 
+// 184|  }
 
 ///|
 fn yy_action_186(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[0].0 is YYObj_String(_dollar1)
-  let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
-  let _end_pos = if _args.length() == 0 {
-    _last_pos
-  } else {
-    _args[_args.length() - 1].2
-  }
-  YYObj_ConstrId(
+  let _sub_action_0_result = yy_action_49(_last_pos, _args[0:1])
+  let _sub_action_1_result = yy_action_95(_args[1].2, _args[2:5])
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _args[1].0 is YYObj_Name(_dollar2)
+  guard _sub_action_1_result is YYObj__list_List_Parameter_(_dollar3)
+  guard _args[6].0 is YYObj__Type__ErrorType_(_dollar5)
+  guard _args[7].0 is YYObj_Bool(_dollar6)
+  YYObj_TraitMethodSig(
     {
       ()
-      ConstrId::{
-        id: Ident(name=_dollar1),
-        loc: mk_loc((_symbol_start_pos, _end_pos)),
+      TraitMethodSig::{
+        attrs: _dollar1,
+        name: _dollar2,
+        params: _dollar3,
+        return_: _dollar5,
+        has_default: _dollar6,
       }
     },
   )
 }
 
+// file:///./stdlib.mbty
+// 40|    L X R { $2 }
+
+///|
+fn yy_action_95(
+  _last_pos : @basic.Position,
+  _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
+) -> YYObj {
+  guard _args[1].0 is YYObj__list_List_Parameter_(_dollar2)
+  YYObj__list_List_Parameter_(
+    {
+      ()
+      _dollar2
+    },
+  )
+}
+
 // file:///./mbti_parser.mbty
-// 354|    PACKAGE_NAME DOT_UIDENT { ConstrId::{ id: Dot(pkg=$1, id=$2), loc: mk_loc($sloc)} }
+// 444|    nonempty_list(attribute) { $1 }
+
+///|
+fn yy_action_49(
+  _last_pos : @basic.Position,
+  _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
+) -> YYObj {
+  guard _args[0].0 is YYObj__list_List_Attribute_(_dollar1)
+  YYObj__list_List_Attribute_(
+    {
+      ()
+      _dollar1
+    },
+  )
+}
+
+// file:///./stdlib.mbty
+// 20|    X { true }
 
 ///|
 fn yy_action_187(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[0].0 is YYObj_String(_dollar1)
-  guard _args[1].0 is YYObj_String(_dollar2)
-  let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
-  let _end_pos = if _args.length() == 0 {
-    _last_pos
-  } else {
-    _args[_args.length() - 1].2
-  }
-  YYObj_ConstrId(
+  let _sub_action_0_result = yy_action_188(_last_pos, _args[0:2])
+  YYObj_Bool(
     {
       ()
-      ConstrId::{
-        id: Dot(pkg=_dollar1, id=_dollar2),
-        loc: mk_loc((_symbol_start_pos, _end_pos)),
-      }
+      true
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 206|    vis "traitalias" qualified_uident "as" uident { TraitAlias(vis=$1, name=$5, trait_name=$3) }
+// 188|    "=" "_" {}
 
 ///|
 fn yy_action_188(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_46(_last_pos, _args[0:0])
-  guard _sub_action_0_result is YYObj_Visibility(_dollar1)
-  guard _args[3].0 is YYObj_Name(_dollar5)
-  guard _args[1].0 is YYObj_QualifiedName(_dollar3)
-  YYObj_AliasSig(
+  YYObj_Unit(())
+}
+
+// file:///./stdlib.mbty
+// 19|    { false }
+
+///|
+fn yy_action_189(
+  _last_pos : @basic.Position,
+  _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
+) -> YYObj {
+  YYObj_Bool(
+    {
+      ()
+      false
+    },
+  )
+}
+
+// file:///./stdlib.mbty
+// 55|    separated_nonempty_list(SEP, X) { $1 }
+
+///|
+fn yy_action_190(
+  _last_pos : @basic.Position,
+  _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
+) -> YYObj {
+  guard _args[0].0 is YYObj__list_List_Parameter_(_dollar1)
+  YYObj__list_List_Parameter_(
     {
       ()
-      TraitAlias(vis=_dollar1, name=_dollar5, trait_name=_dollar3)
+      _dollar1
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 331|    { Default }
+// 374|    type_ { DiscardPositional(ty = Some($1), loc = mk_loc($loc($1))) }
 
 ///|
-fn yy_action_46(
+fn yy_action_191(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  YYObj_Visibility(
+  guard _args[0].0 is YYObj_Type(_dollar1)
+  let _start_pos_of_item0 = _args[0].1
+  let _end_pos_of_item0 = _args[0].2
+  YYObj_Parameter(
     {
       ()
-      Default
+      DiscardPositional(
+        ty=Some(_dollar1),
+        loc=mk_loc((_start_pos_of_item0, _end_pos_of_item0)),
+      )
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 358|    UIDENT { Name::{name: $1, loc: mk_loc($sloc)} }
+// 375|    post_label ":" type_ { Labelled(binder = { name : $1.name, loc : $1.loc }, ty = Some($3)) }
 
 ///|
-fn yy_action_189(
+fn yy_action_192(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[0].0 is YYObj_String(_dollar1)
-  let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
-  let _end_pos = if _args.length() == 0 {
-    _last_pos
-  } else {
-    _args[_args.length() - 1].2
-  }
-  YYObj_Name(
+  guard _args[0].0 is YYObj_Label(_dollar1)
+  guard _args[2].0 is YYObj_Type(_dollar3)
+  YYObj_Parameter(
     {
       ()
-      Name::{ name: _dollar1, loc: mk_loc((_symbol_start_pos, _end_pos)) }
+      Labelled(
+        binder={ name: _dollar1.name, loc: _dollar1.loc },
+        ty=Some(_dollar3),
+      )
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 207|    "fnalias" qualified_uident "::" lident { FnAlias(name=$4, type_name=$2, loc=mk_loc($sloc)) }
+// 349|    is_async "(" type_ "," ioption(separated_nonempty_list(",", type_)) ")" "->" return_type { Arrow(args=$5.unwrap_or(@list.empty()).add($3), res=$8.0, err=$8.1, is_async=$1, loc=mk_loc($sloc)) }
 
 ///|
-fn yy_action_190(
+fn yy_action_193(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[3].0 is YYObj_Name(_dollar4)
-  guard _args[1].0 is YYObj_QualifiedName(_dollar2)
+  let _sub_action_0_result = yy_action_94(_last_pos, _args[0:1])
+  let _sub_action_1_result = yy_action_194(_args[3].2, _args[4:4])
+  guard _sub_action_1_result is YYObj_Option__list_List_Type__(_dollar5)
+  guard _args[2].0 is YYObj_Type(_dollar3)
+  guard _args[6].0 is YYObj__Type__ErrorType_(_dollar8)
+  guard _sub_action_0_result is YYObj_Location_(_dollar1)
   let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
   let _end_pos = if _args.length() == 0 {
     _last_pos
   } else {
     _args[_args.length() - 1].2
   }
-  YYObj_AliasSig(
+  YYObj_Type(
     {
       ()
-      FnAlias(
-        name=_dollar4,
-        type_name=_dollar2,
+      Arrow(
+        args=_dollar5.unwrap_or(@list.empty()).add(_dollar3),
+        res=_dollar8.0,
+        err=_dollar8.1,
+        is_async=_dollar1,
         loc=mk_loc((_symbol_start_pos, _end_pos)),
       )
     },
@@ -4471,356 +5261,1463 @@ fn yy_action_190(
 }
 
 // file:///./mbti_parser.mbty
-// 362|    LIDENT { Name::{name: $1, loc: mk_loc($sloc)} }
+// 349|    is_async "(" type_ "," ioption(separated_nonempty_list(",", type_)) ")" "->" return_type { Arrow(args=$5.unwrap_or(@list.empty()).add($3), res=$8.0, err=$8.1, is_async=$1, loc=mk_loc($sloc)) }
 
 ///|
-fn yy_action_191(
+fn yy_action_195(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[0].0 is YYObj_String(_dollar1)
+  let _sub_action_0_result = yy_action_94(_last_pos, _args[0:1])
+  let _sub_action_1_result = yy_action_196(_args[3].2, _args[4:5])
+  guard _sub_action_1_result is YYObj_Option__list_List_Type__(_dollar5)
+  guard _args[2].0 is YYObj_Type(_dollar3)
+  guard _args[7].0 is YYObj__Type__ErrorType_(_dollar8)
+  guard _sub_action_0_result is YYObj_Location_(_dollar1)
   let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
   let _end_pos = if _args.length() == 0 {
     _last_pos
   } else {
     _args[_args.length() - 1].2
   }
-  YYObj_Name(
+  YYObj_Type(
     {
       ()
-      Name::{ name: _dollar1, loc: mk_loc((_symbol_start_pos, _end_pos)) }
+      Arrow(
+        args=_dollar5.unwrap_or(@list.empty()).add(_dollar3),
+        res=_dollar8.0,
+        err=_dollar8.1,
+        is_async=_dollar1,
+        loc=mk_loc((_symbol_start_pos, _end_pos)),
+      )
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 348|    UIDENT { QualifiedName::{ name: Ident(name=$1), loc: mk_loc($sloc)} }
+// 351|    is_async "(" type_ ")" "->" return_type { Arrow(args=@list.singleton($3), res=$6.0, err=$6.1, is_async=$1, loc=mk_loc($sloc)) }
 
 ///|
-fn yy_action_192(
+fn yy_action_197(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[0].0 is YYObj_String(_dollar1)
+  let _sub_action_0_result = yy_action_94(_last_pos, _args[0:1])
+  guard _args[2].0 is YYObj_Type(_dollar3)
+  guard _args[5].0 is YYObj__Type__ErrorType_(_dollar6)
+  guard _sub_action_0_result is YYObj_Location_(_dollar1)
   let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
   let _end_pos = if _args.length() == 0 {
     _last_pos
   } else {
     _args[_args.length() - 1].2
   }
-  YYObj_QualifiedName(
+  YYObj_Type(
     {
       ()
-      QualifiedName::{
-        name: Ident(name=_dollar1),
-        loc: mk_loc((_symbol_start_pos, _end_pos)),
-      }
+      Arrow(
+        args=@list.singleton(_dollar3),
+        res=_dollar6.0,
+        err=_dollar6.1,
+        is_async=_dollar1,
+        loc=mk_loc((_symbol_start_pos, _end_pos)),
+      )
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 349|    PACKAGE_NAME DOT_UIDENT { QualifiedName::{ name: Dot(pkg=$1, id=$2), loc: mk_loc($sloc)} }
+// 342|    qualified_uident_ optional_type_arguments { Name(constr_id=$1, tys=$2, loc=mk_loc($sloc)) }
 
 ///|
-fn yy_action_193(
+fn yy_action_198(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[0].0 is YYObj_String(_dollar1)
-  guard _args[1].0 is YYObj_String(_dollar2)
+  guard _args[0].0 is YYObj_ConstrId(_dollar1)
+  guard _args[1].0 is YYObj__list_List_Type_(_dollar2)
   let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
   let _end_pos = if _args.length() == 0 {
     _last_pos
   } else {
     _args[_args.length() - 1].2
   }
-  YYObj_QualifiedName(
+  YYObj_Type(
     {
       ()
-      QualifiedName::{
-        name: Dot(pkg=_dollar1, id=_dollar2),
-        loc: mk_loc((_symbol_start_pos, _end_pos)),
-      }
+      Name(
+        constr_id=_dollar1,
+        tys=_dollar2,
+        loc=mk_loc((_symbol_start_pos, _end_pos)),
+      )
     },
   )
 }
 
-// file:///./stdlib.mbty
-// 50|    X nonempty_list(X) { $2.add($1) }
+// file:///./mbti_parser.mbty
+// 369|    delimited("[", separated_nonempty_list(",", type_), "]") { $1 }
 
 ///|
-fn yy_action_194(
+fn yy_action_199(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[1].0
-    is YYObj__list_List__String__Option_String___String__(_dollar2)
-  guard _args[0].0 is YYObj__String__Option_String___String_(_dollar1)
-  YYObj__list_List__String__Option_String___String__(
+  let _sub_action_0_result = yy_action_200(_last_pos, _args[0:3])
+  guard _sub_action_0_result is YYObj__list_List_Type_(_dollar1)
+  YYObj__list_List_Type_(
     {
       ()
-      _dollar2.add(_dollar1)
+      _dollar1
     },
   )
 }
 
 // file:///./stdlib.mbty
-// 50|    X nonempty_list(X) { $2.add($1) }
+// 40|    L X R { $2 }
 
 ///|
-fn yy_action_195(
+fn yy_action_200(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_196(_last_pos, _args[0:1])
-  guard _args[1].0 is YYObj__list_List_Attribute_(_dollar2)
-  guard _sub_action_0_result is YYObj_Attribute(_dollar1)
-  YYObj__list_List_Attribute_(
+  guard _args[1].0 is YYObj__list_List_Type_(_dollar2)
+  YYObj__list_List_Type_(
     {
       ()
-      _dollar2.add(_dollar1)
+      _dollar2
     },
   )
 }
 
-// file:///./stdlib.mbty
-// 49|    X { @list.singleton($1) }
+// file:///./mbti_parser.mbty
+// 349|    is_async "(" type_ "," ioption(separated_nonempty_list(",", type_)) ")" "->" return_type { Arrow(args=$5.unwrap_or(@list.empty()).add($3), res=$8.0, err=$8.1, is_async=$1, loc=mk_loc($sloc)) }
 
 ///|
-fn yy_action_197(
+fn yy_action_201(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_196(_last_pos, _args[0:1])
-  guard _sub_action_0_result is YYObj_Attribute(_dollar1)
-  YYObj__list_List_Attribute_(
-    {
-      ()
-      @list.singleton(_dollar1)
+  let _sub_action_0_result = yy_action_97(_last_pos, _args[0:0])
+  let _sub_action_1_result = yy_action_196(_args[2].2, _args[3:4])
+  guard _sub_action_1_result is YYObj_Option__list_List_Type__(_dollar5)
+  guard _args[1].0 is YYObj_Type(_dollar3)
+  guard _args[6].0 is YYObj__Type__ErrorType_(_dollar8)
+  guard _sub_action_0_result is YYObj_Location_(_dollar1)
+  let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
+  let _end_pos = if _args.length() == 0 {
+    _last_pos
+  } else {
+    _args[_args.length() - 1].2
+  }
+  YYObj_Type(
+    {
+      ()
+      Arrow(
+        args=_dollar5.unwrap_or(@list.empty()).add(_dollar3),
+        res=_dollar8.0,
+        err=_dollar8.1,
+        is_async=_dollar1,
+        loc=mk_loc((_symbol_start_pos, _end_pos)),
+      )
     },
   )
 }
 
-// file:///./mbti_parser.mbty
-// 379|    ATTRIBUTE { Attribute::new(loc=mk_loc($sloc), $1) }
+// file:///./stdlib.mbty
+// 10|    X { Some($1) }
 
 ///|
 fn yy_action_196(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
+  guard _args[0].0 is YYObj__list_List_Type_(_dollar1)
+  YYObj_Option__list_List_Type__(
+    {
+      ()
+      Some(_dollar1)
+    },
+  )
+}
+
+// file:///./mbti_parser.mbty
+// 340|    "(" type_ "," separated_nonempty_list(",", type_) ")" { Tuple(tys=$4.add($2), loc=mk_loc($sloc)) }
+
+///|
+fn yy_action_202(
+  _last_pos : @basic.Position,
+  _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
+) -> YYObj {
+  guard _args[3].0 is YYObj__list_List_Type_(_dollar4)
+  guard _args[1].0 is YYObj_Type(_dollar2)
   let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
   let _end_pos = if _args.length() == 0 {
     _last_pos
   } else {
     _args[_args.length() - 1].2
   }
-  guard _args[0].0 is YYObj__String__Option_String___String_(_dollar1)
-  YYObj_Attribute(
+  YYObj_Type(
     {
       ()
-      Attribute::new(loc=mk_loc((_symbol_start_pos, _end_pos)), _dollar1)
+      Tuple(
+        tys=_dollar4.add(_dollar2),
+        loc=mk_loc((_symbol_start_pos, _end_pos)),
+      )
+    },
+  )
+}
+
+// file:///./mbti_parser.mbty
+// 349|    is_async "(" type_ "," ioption(separated_nonempty_list(",", type_)) ")" "->" return_type { Arrow(args=$5.unwrap_or(@list.empty()).add($3), res=$8.0, err=$8.1, is_async=$1, loc=mk_loc($sloc)) }
+
+///|
+fn yy_action_203(
+  _last_pos : @basic.Position,
+  _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
+) -> YYObj {
+  let _sub_action_0_result = yy_action_97(_last_pos, _args[0:0])
+  let _sub_action_1_result = yy_action_194(_args[2].2, _args[3:3])
+  guard _sub_action_1_result is YYObj_Option__list_List_Type__(_dollar5)
+  guard _args[1].0 is YYObj_Type(_dollar3)
+  guard _args[5].0 is YYObj__Type__ErrorType_(_dollar8)
+  guard _sub_action_0_result is YYObj_Location_(_dollar1)
+  let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
+  let _end_pos = if _args.length() == 0 {
+    _last_pos
+  } else {
+    _args[_args.length() - 1].2
+  }
+  YYObj_Type(
+    {
+      ()
+      Arrow(
+        args=_dollar5.unwrap_or(@list.empty()).add(_dollar3),
+        res=_dollar8.0,
+        err=_dollar8.1,
+        is_async=_dollar1,
+        loc=mk_loc((_symbol_start_pos, _end_pos)),
+      )
     },
   )
 }
 
 // file:///./stdlib.mbty
-// 49|    X { @list.singleton($1) }
+// 9|    { None }
 
 ///|
-fn yy_action_198(
+fn yy_action_194(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[0].0 is YYObj__String__Option_String___String_(_dollar1)
-  YYObj__list_List__String__Option_String___String__(
+  YYObj_Option__list_List_Type__(
     {
       ()
-      @list.singleton(_dollar1)
+      None
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 136|     { @list.empty() }
+// 351|    is_async "(" type_ ")" "->" return_type { Arrow(args=@list.singleton($3), res=$6.0, err=$6.1, is_async=$1, loc=mk_loc($sloc)) }
 
 ///|
-fn yy_action_199(
+fn yy_action_204(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  YYObj__list_List__Sig__Location__(
+  let _sub_action_0_result = yy_action_97(_last_pos, _args[0:0])
+  guard _args[1].0 is YYObj_Type(_dollar3)
+  guard _args[4].0 is YYObj__Type__ErrorType_(_dollar6)
+  guard _sub_action_0_result is YYObj_Location_(_dollar1)
+  let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
+  let _end_pos = if _args.length() == 0 {
+    _last_pos
+  } else {
+    _args[_args.length() - 1].2
+  }
+  YYObj_Type(
     {
       ()
-      @list.empty()
+      Arrow(
+        args=@list.singleton(_dollar3),
+        res=_dollar6.0,
+        err=_dollar6.1,
+        is_async=_dollar1,
+        loc=mk_loc((_symbol_start_pos, _end_pos)),
+      )
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 127|    "import" "(" separated_nonempty_list(";", package_import) ")" ";" { $3 }
+// 341|    "(" type_ ")" { $2 }
 
 ///|
-fn yy_action_200(
+fn yy_action_205(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[2].0 is YYObj__list_List_PackageImport_(_dollar3)
-  YYObj__list_List_PackageImport_(
+  guard _args[1].0 is YYObj_Type(_dollar2)
+  YYObj_Type(
     {
       ()
-      _dollar3
+      _dollar2
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 132|    STRING "as" LIDENT { PackageImport::{name: $1, alias_: Some($3)} }
+// 339|    simple_type "?" { Option(ty=$1, loc=mk_loc($sloc), question_loc=mk_loc($loc($2))) }
 
 ///|
-fn yy_action_201(
+fn yy_action_206(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[0].0 is YYObj_StringLiteral(_dollar1)
-  guard _args[2].0 is YYObj_String(_dollar3)
-  YYObj_PackageImport(
+  guard _args[0].0 is YYObj_Type(_dollar1)
+  let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
+  let _end_pos = if _args.length() == 0 {
+    _last_pos
+  } else {
+    _args[_args.length() - 1].2
+  }
+  let _start_pos_of_item1 = _args[1].1
+  let _end_pos_of_item1 = _args[1].2
+  YYObj_Type(
     {
       ()
-      PackageImport::{ name: _dollar1, alias_: Some(_dollar3) }
+      Option(
+        ty=_dollar1,
+        loc=mk_loc((_symbol_start_pos, _end_pos)),
+        question_loc=mk_loc((_start_pos_of_item1, _end_pos_of_item1)),
+      )
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 131|    STRING { PackageImport::{name: $1, alias_: None} }
+// 357|    simple_type "raise" error_type { ($1, ErrorType(ty = $3)) }
 
 ///|
-fn yy_action_202(
+fn yy_action_207(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[0].0 is YYObj_StringLiteral(_dollar1)
-  YYObj_PackageImport(
+  guard _args[0].0 is YYObj_Type(_dollar1)
+  guard _args[2].0 is YYObj_Type(_dollar3)
+  YYObj__Type__ErrorType_(
     {
       ()
-      PackageImport::{ name: _dollar1, alias_: None }
+      (_dollar1, ErrorType(ty=_dollar3))
     },
   )
 }
 
-// file:///./stdlib.mbty
-// 60|    X SEP separated_nonempty_list(SEP, X) { $3.add($1) }
+// file:///./mbti_parser.mbty
+// 358|    simple_type "raise" "?" {
+// 359|    let fake_error : Type = Name(constr_id={ id : QualifiedIdent::Ident(name="Error"), loc :@syntax.no_location }, tys=@list.empty(), loc=@syntax.no_location)
+// 360|    ($1, MaybeError(ty=fake_error)) 
+// 361|  }
 
 ///|
-fn yy_action_203(
+fn yy_action_208(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[2].0 is YYObj__list_List_PackageImport_(_dollar3)
-  guard _args[0].0 is YYObj_PackageImport(_dollar1)
-  YYObj__list_List_PackageImport_(
+  guard _args[0].0 is YYObj_Type(_dollar1)
+  YYObj__Type__ErrorType_(
     {
       ()
-      _dollar3.add(_dollar1)
+      let fake_error : Type = Name(
+        constr_id={
+          id: QualifiedIdent::Ident(name="Error"),
+          loc: @syntax.no_location,
+        },
+        tys=@list.empty(),
+        loc=@syntax.no_location,
+      )
+      (_dollar1, MaybeError(ty=fake_error))
     },
   )
 }
 
-// file:///./stdlib.mbty
-// 59|    X { @list.singleton($1) }
+// file:///./mbti_parser.mbty
+// 365|    qualified_uident_ { Name(constr_id=$1, tys=@list.empty(), loc=mk_loc($sloc)) }
 
 ///|
-fn yy_action_204(
+fn yy_action_209(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  guard _args[0].0 is YYObj_PackageImport(_dollar1)
-  YYObj__list_List_PackageImport_(
+  guard _args[0].0 is YYObj_ConstrId(_dollar1)
+  let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
+  let _end_pos = if _args.length() == 0 {
+    _last_pos
+  } else {
+    _args[_args.length() - 1].2
+  }
+  YYObj_Type(
     {
       ()
-      @list.singleton(_dollar1)
+      Name(
+        constr_id=_dollar1,
+        tys=@list.empty(),
+        loc=mk_loc((_symbol_start_pos, _end_pos)),
+      )
     },
   )
 }
 
 // file:///./mbti_parser.mbty
-// 126|     { @list.empty() }
+// 356|    simple_type "raise" { ($1, DefaultErrorType(loc=mk_loc($loc($2)))) }
 
 ///|
-fn yy_action_205(
+fn yy_action_210(
   _last_pos : @basic.Position,
   _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
 ) -> YYObj {
-  YYObj__list_List_PackageImport_(
+  guard _args[0].0 is YYObj_Type(_dollar1)
+  let _start_pos_of_item1 = _args[1].1
+  let _end_pos_of_item1 = _args[1].2
+  YYObj__Type__ErrorType_(
     {
       ()
-      @list.empty()
+      (
+        _dollar1,
+        DefaultErrorType(loc=mk_loc((_start_pos_of_item1, _end_pos_of_item1))),
+      )
     },
   )
 }
 
+// file:///./mbti_parser.mbty
+// 348|    simple_type { $1 }
+
 ///|
-fn yy_input(
-  token : Token,
-  _start_pos : @basic.Position,
-  _end_pos : @basic.Position,
-) -> (YYSymbol, YYObj) {
-  match token {
-    CHAR(data) => (T_CHAR, YYObj_CharLiteral(data))
-    INT(data) => (T_INT, YYObj_String(data))
-    BYTE(data) => (T_BYTE, YYObj_CharLiteral(data))
-    BYTES(data) => (T_BYTES, YYObj_StringLiteral(data))
-    FLOAT(data) => (T_FLOAT, YYObj_String(data))
-    DOUBLE(data) => (T_DOUBLE, YYObj_String(data))
-    STRING(data) => (T_STRING, YYObj_StringLiteral(data))
-    MULTILINE_STRING(data) => (T_MULTILINE_STRING, YYObj_String(data))
-    MULTILINE_INTERP(data) => (T_MULTILINE_INTERP, YYObj_InterpLiteral(data))
-    INTERP(data) => (T_INTERP, YYObj_InterpLiteral(data))
-    REGEX_LITERAL(data) => (T_REGEX_LITERAL, YYObj_String(data))
-    REGEX_INTERP(data) => (T_REGEX_INTERP, YYObj_InterpLiteral(data))
-    ATTRIBUTE(data) =>
-      (T_ATTRIBUTE, YYObj__String__Option_String___String_(data))
-    LIDENT(data) => (T_LIDENT, YYObj_String(data))
-    UIDENT(data) => (T_UIDENT, YYObj_String(data))
-    POST_LABEL(data) => (T_POST_LABEL, YYObj_String(data))
-    COMMENT(data) => (T_COMMENT, YYObj_Comment(data))
-    NEWLINE => (T_NEWLINE, YYObj_Void)
-    INFIX1(data) => (T_INFIX1, YYObj_String(data))
-    INFIX2(data) => (T_INFIX2, YYObj_String(data))
-    INFIX3(data) => (T_INFIX3, YYObj_String(data))
-    INFIX4(data) => (T_INFIX4, YYObj_String(data))
-    AUGMENTED_ASSIGNMENT(data) => (T_AUGMENTED_ASSIGNMENT, YYObj_String(data))
-    EOF => (T_EOF, YYObj_Void)
-    FALSE => (T_FALSE, YYObj_Void)
-    TRUE => (T_TRUE, YYObj_Void)
-    PUB => (T_PUB, YYObj_Void)
-    PRIV => (T_PRIV, YYObj_Void)
-    READONLY => (T_READONLY, YYObj_Void)
-    IMPORT => (T_IMPORT, YYObj_Void)
-    EXTERN => (T_EXTERN, YYObj_Void)
-    BREAK => (T_BREAK, YYObj_Void)
-    CONTINUE => (T_CONTINUE, YYObj_Void)
-    STRUCT => (T_STRUCT, YYObj_Void)
-    ENUM => (T_ENUM, YYObj_Void)
-    TRAIT => (T_TRAIT, YYObj_Void)
-    DERIVE => (T_DERIVE, YYObj_Void)
-    IMPL => (T_IMPL, YYObj_Void)
-    WITH => (T_WITH, YYObj_Void)
-    RAISE => (T_RAISE, YYObj_Void)
-    THROW => (T_THROW, YYObj_Void)
-    TRY => (T_TRY, YYObj_Void)
-    CATCH => (T_CATCH, YYObj_Void)
-    ASYNC => (T_ASYNC, YYObj_Void)
-    TYPEALIAS => (T_TYPEALIAS, YYObj_Void)
-    TRAITALIAS => (T_TRAITALIAS, YYObj_Void)
-    FNALIAS => (T_FNALIAS, YYObj_Void)
-    EQUAL => (T_EQUAL, YYObj_Void)
-    LPAREN => (T_LPAREN, YYObj_Void)
-    RPAREN => (T_RPAREN, YYObj_Void)
-    COMMA => (T_COMMA, YYObj_Void)
-    MINUS => (T_MINUS, YYObj_Void)
+fn yy_action_211(
+  _last_pos : @basic.Position,
+  _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
+) -> YYObj {
+  guard _args[0].0 is YYObj_Type(_dollar1)
+  YYObj_Type(
+    {
+      ()
+      _dollar1
+    },
+  )
+}
+
+// file:///./mbti_parser.mbty
+// 350|    is_async "(" ")" "->" return_type { Arrow(args=@list.empty(), res=$5.0, err=$5.1, is_async=$1, loc=mk_loc($sloc)) }
+
+///|
+fn yy_action_212(
+  _last_pos : @basic.Position,
+  _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
+) -> YYObj {
+  let _sub_action_0_result = yy_action_97(_last_pos, _args[0:0])
+  guard _args[3].0 is YYObj__Type__ErrorType_(_dollar5)
+  guard _sub_action_0_result is YYObj_Location_(_dollar1)
+  let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
+  let _end_pos = if _args.length() == 0 {
+    _last_pos
+  } else {
+    _args[_args.length() - 1].2
+  }
+  YYObj_Type(
+    {
+      ()
+      Arrow(
+        args=@list.empty(),
+        res=_dollar5.0,
+        err=_dollar5.1,
+        is_async=_dollar1,
+        loc=mk_loc((_symbol_start_pos, _end_pos)),
+      )
+    },
+  )
+}
+
+// file:///./mbti_parser.mbty
+// 413|    { None }
+
+///|
+fn yy_action_97(
+  _last_pos : @basic.Position,
+  _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
+) -> YYObj {
+  YYObj_Location_(
+    {
+      ()
+      None
+    },
+  )
+}
+
+// file:///./stdlib.mbty
+// 60|    X SEP separated_nonempty_list(SEP, X) { $3.add($1) }
+
+///|
+fn yy_action_213(
+  _last_pos : @basic.Position,
+  _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
+) -> YYObj {
+  guard _args[2].0 is YYObj__list_List_Type_(_dollar3)
+  guard _args[0].0 is YYObj_Type(_dollar1)
+  YYObj__list_List_Type_(
+    {
+      ()
+      _dollar3.add(_dollar1)
+    },
+  )
+}
+
+// file:///./stdlib.mbty
+// 59|    X { @list.singleton($1) }
+
+///|
+fn yy_action_214(
+  _last_pos : @basic.Position,
+  _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
+) -> YYObj {
+  guard _args[0].0 is YYObj_Type(_dollar1)
+  YYObj__list_List_Type_(
+    {
+      ()
+      @list.singleton(_dollar1)
+    },
+  )
+}
+
+// file:///./mbti_parser.mbty
+// 370|     { @list.empty() }
+
+///|
+fn yy_action_215(
+  _last_pos : @basic.Position,
+  _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
+) -> YYObj {
+  YYObj__list_List_Type_(
+    {
+      ()
+      @list.empty()
+    },
+  )
+}
+
+// file:///./mbti_parser.mbty
+// 343|    "&" qualified_uident_ { Object($2) }
+
+///|
+fn yy_action_216(
+  _last_pos : @basic.Position,
+  _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
+) -> YYObj {
+  guard _args[1].0 is YYObj_ConstrId(_dollar2)
+  YYObj_Type(
+    {
+      ()
+      Object(_dollar2)
+    },
+  )
+}
+
+// file:///./mbti_parser.mbty
+// 344|    "_" { Any(loc=mk_loc($sloc)) }
+
+///|
+fn yy_action_217(
+  _last_pos : @basic.Position,
+  _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
+) -> YYObj {
+  let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
+  let _end_pos = if _args.length() == 0 {
+    _last_pos
+  } else {
+    _args[_args.length() - 1].2
+  }
+  YYObj_Type(
+    {
+      ()
+      Any(loc=mk_loc((_symbol_start_pos, _end_pos)))
+    },
+  )
+}
+
+// file:///./mbti_parser.mbty
+// 350|    is_async "(" ")" "->" return_type { Arrow(args=@list.empty(), res=$5.0, err=$5.1, is_async=$1, loc=mk_loc($sloc)) }
+
+///|
+fn yy_action_218(
+  _last_pos : @basic.Position,
+  _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
+) -> YYObj {
+  let _sub_action_0_result = yy_action_94(_last_pos, _args[0:1])
+  guard _args[4].0 is YYObj__Type__ErrorType_(_dollar5)
+  guard _sub_action_0_result is YYObj_Location_(_dollar1)
+  let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
+  let _end_pos = if _args.length() == 0 {
+    _last_pos
+  } else {
+    _args[_args.length() - 1].2
+  }
+  YYObj_Type(
+    {
+      ()
+      Arrow(
+        args=@list.empty(),
+        res=_dollar5.0,
+        err=_dollar5.1,
+        is_async=_dollar1,
+        loc=mk_loc((_symbol_start_pos, _end_pos)),
+      )
+    },
+  )
+}
+
+// file:///./mbti_parser.mbty
+// 412|    "async" { Some(mk_loc($loc($1))) }
+
+///|
+fn yy_action_94(
+  _last_pos : @basic.Position,
+  _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
+) -> YYObj {
+  let _start_pos_of_item0 = _args[0].1
+  let _end_pos_of_item0 = _args[0].2
+  YYObj_Location_(
+    {
+      ()
+      Some(mk_loc((_start_pos_of_item0, _end_pos_of_item0)))
+    },
+  )
+}
+
+// file:///./mbti_parser.mbty
+// 355|    type_ { ($1, NoErrorType) }
+
+///|
+fn yy_action_219(
+  _last_pos : @basic.Position,
+  _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
+) -> YYObj {
+  guard _args[0].0 is YYObj_Type(_dollar1)
+  YYObj__Type__ErrorType_(
+    {
+      ()
+      (_dollar1, NoErrorType)
+    },
+  )
+}
+
+// file:///./mbti_parser.mbty
+// 376|    label "?" ":" type_ { QuestionOptional(binder = { name : $1.name, loc : $1.loc }, ty = Some($4)) }
+
+///|
+fn yy_action_220(
+  _last_pos : @basic.Position,
+  _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
+) -> YYObj {
+  guard _args[0].0 is YYObj_Label(_dollar1)
+  guard _args[3].0 is YYObj_Type(_dollar4)
+  YYObj_Parameter(
+    {
+      ()
+      QuestionOptional(
+        binder={ name: _dollar1.name, loc: _dollar1.loc },
+        ty=Some(_dollar4),
+      )
+    },
+  )
+}
+
+// file:///./mbti_parser.mbty
+// 422|    UIDENT { ConstrId::{ id: Ident(name=$1), loc: mk_loc($sloc)} }
+
+///|
+fn yy_action_221(
+  _last_pos : @basic.Position,
+  _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
+) -> YYObj {
+  guard _args[0].0 is YYObj_String(_dollar1)
+  let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
+  let _end_pos = if _args.length() == 0 {
+    _last_pos
+  } else {
+    _args[_args.length() - 1].2
+  }
+  YYObj_ConstrId(
+    {
+      ()
+      ConstrId::{
+        id: Ident(name=_dollar1),
+        loc: mk_loc((_symbol_start_pos, _end_pos)),
+      }
+    },
+  )
+}
+
+// file:///./mbti_parser.mbty
+// 423|    PACKAGE_NAME DOT_UIDENT { ConstrId::{ id: Dot(pkg=$1, id=$2), loc: mk_loc($sloc)} }
+
+///|
+fn yy_action_222(
+  _last_pos : @basic.Position,
+  _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
+) -> YYObj {
+  guard _args[0].0 is YYObj_String(_dollar1)
+  guard _args[1].0 is YYObj_String(_dollar2)
+  let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
+  let _end_pos = if _args.length() == 0 {
+    _last_pos
+  } else {
+    _args[_args.length() - 1].2
+  }
+  YYObj_ConstrId(
+    {
+      ()
+      ConstrId::{
+        id: Dot(pkg=_dollar1, id=_dollar2),
+        loc: mk_loc((_symbol_start_pos, _end_pos)),
+      }
+    },
+  )
+}
+
+// file:///./mbti_parser.mbty
+// 435|    LIDENT { Label::{name: $1, loc: mk_loc($sloc)} }
+
+///|
+fn yy_action_223(
+  _last_pos : @basic.Position,
+  _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
+) -> YYObj {
+  guard _args[0].0 is YYObj_String(_dollar1)
+  let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
+  let _end_pos = if _args.length() == 0 {
+    _last_pos
+  } else {
+    _args[_args.length() - 1].2
+  }
+  YYObj_Label(
+    {
+      ()
+      Label::{ name: _dollar1, loc: mk_loc((_symbol_start_pos, _end_pos)) }
+    },
+  )
+}
+
+// file:///./mbti_parser.mbty
+// 439|    POST_LABEL { Label::{name: $1, loc: mk_loc($sloc)} }
+
+///|
+fn yy_action_224(
+  _last_pos : @basic.Position,
+  _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
+) -> YYObj {
+  guard _args[0].0 is YYObj_String(_dollar1)
+  let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
+  let _end_pos = if _args.length() == 0 {
+    _last_pos
+  } else {
+    _args[_args.length() - 1].2
+  }
+  YYObj_Label(
+    {
+      ()
+      Label::{ name: _dollar1, loc: mk_loc((_symbol_start_pos, _end_pos)) }
+    },
+  )
+}
+
+// file:///./stdlib.mbty
+// 60|    X SEP separated_nonempty_list(SEP, X) { $3.add($1) }
+
+///|
+fn yy_action_225(
+  _last_pos : @basic.Position,
+  _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
+) -> YYObj {
+  guard _args[2].0 is YYObj__list_List_Parameter_(_dollar3)
+  guard _args[0].0 is YYObj_Parameter(_dollar1)
+  YYObj__list_List_Parameter_(
+    {
+      ()
+      _dollar3.add(_dollar1)
+    },
+  )
+}
+
+// file:///./stdlib.mbty
+// 59|    X { @list.singleton($1) }
+
+///|
+fn yy_action_226(
+  _last_pos : @basic.Position,
+  _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
+) -> YYObj {
+  guard _args[0].0 is YYObj_Parameter(_dollar1)
+  YYObj__list_List_Parameter_(
+    {
+      ()
+      @list.singleton(_dollar1)
+    },
+  )
+}
+
+// file:///./stdlib.mbty
+// 54|    { @list.empty() }
+
+///|
+fn yy_action_227(
+  _last_pos : @basic.Position,
+  _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
+) -> YYObj {
+  YYObj__list_List_Parameter_(
+    {
+      ()
+      @list.empty()
+    },
+  )
+}
+
+// file:///./stdlib.mbty
+// 60|    X SEP separated_nonempty_list(SEP, X) { $3.add($1) }
+
+///|
+fn yy_action_228(
+  _last_pos : @basic.Position,
+  _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
+) -> YYObj {
+  guard _args[2].0 is YYObj__list_List_TraitMethodSig_(_dollar3)
+  guard _args[0].0 is YYObj_TraitMethodSig(_dollar1)
+  YYObj__list_List_TraitMethodSig_(
+    {
+      ()
+      _dollar3.add(_dollar1)
+    },
+  )
+}
+
+// file:///./stdlib.mbty
+// 59|    X { @list.singleton($1) }
+
+///|
+fn yy_action_229(
+  _last_pos : @basic.Position,
+  _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
+) -> YYObj {
+  guard _args[0].0 is YYObj_TraitMethodSig(_dollar1)
+  YYObj__list_List_TraitMethodSig_(
+    {
+      ()
+      @list.singleton(_dollar1)
+    },
+  )
+}
+
+// file:///./mbti_parser.mbty
+// 417|    UIDENT { QualifiedName::{ name: Ident(name=$1), loc: mk_loc($sloc)} }
+
+///|
+fn yy_action_230(
+  _last_pos : @basic.Position,
+  _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
+) -> YYObj {
+  guard _args[0].0 is YYObj_String(_dollar1)
+  let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
+  let _end_pos = if _args.length() == 0 {
+    _last_pos
+  } else {
+    _args[_args.length() - 1].2
+  }
+  YYObj_QualifiedName(
+    {
+      ()
+      QualifiedName::{
+        name: Ident(name=_dollar1),
+        loc: mk_loc((_symbol_start_pos, _end_pos)),
+      }
+    },
+  )
+}
+
+// file:///./mbti_parser.mbty
+// 418|    PACKAGE_NAME DOT_UIDENT { QualifiedName::{ name: Dot(pkg=$1, id=$2), loc: mk_loc($sloc)} }
+
+///|
+fn yy_action_231(
+  _last_pos : @basic.Position,
+  _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
+) -> YYObj {
+  guard _args[0].0 is YYObj_String(_dollar1)
+  guard _args[1].0 is YYObj_String(_dollar2)
+  let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
+  let _end_pos = if _args.length() == 0 {
+    _last_pos
+  } else {
+    _args[_args.length() - 1].2
+  }
+  YYObj_QualifiedName(
+    {
+      ()
+      QualifiedName::{
+        name: Dot(pkg=_dollar1, id=_dollar2),
+        loc: mk_loc((_symbol_start_pos, _end_pos)),
+      }
+    },
+  )
+}
+
+// file:///./stdlib.mbty
+// 60|    X SEP separated_nonempty_list(SEP, X) { $3.add($1) }
+
+///|
+fn yy_action_232(
+  _last_pos : @basic.Position,
+  _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
+) -> YYObj {
+  guard _args[2].0 is YYObj__list_List_QualifiedName_(_dollar3)
+  guard _args[0].0 is YYObj_QualifiedName(_dollar1)
+  YYObj__list_List_QualifiedName_(
+    {
+      ()
+      _dollar3.add(_dollar1)
+    },
+  )
+}
+
+// file:///./stdlib.mbty
+// 59|    X { @list.singleton($1) }
+
+///|
+fn yy_action_233(
+  _last_pos : @basic.Position,
+  _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
+) -> YYObj {
+  guard _args[0].0 is YYObj_QualifiedName(_dollar1)
+  YYObj__list_List_QualifiedName_(
+    {
+      ()
+      @list.singleton(_dollar1)
+    },
+  )
+}
+
+// file:///./stdlib.mbty
+// 15|    X { $1 }
+
+///|
+fn yy_action_234(
+  _last_pos : @basic.Position,
+  _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
+) -> YYObj {
+  let _sub_action_0_result = yy_action_235(_last_pos, _args[0:2])
+  guard _sub_action_0_result is YYObj__list_List_QualifiedName_(_dollar1)
+  YYObj__list_List_QualifiedName_(
+    {
+      ()
+      _dollar1
+    },
+  )
+}
+
+// file:///./stdlib.mbty
+// 32|    L X { $2 }
+
+///|
+fn yy_action_235(
+  _last_pos : @basic.Position,
+  _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
+) -> YYObj {
+  guard _args[1].0 is YYObj__list_List_QualifiedName_(_dollar2)
+  YYObj__list_List_QualifiedName_(
+    {
+      ()
+      _dollar2
+    },
+  )
+}
+
+// file:///./stdlib.mbty
+// 14|    { @list.empty() }
+
+///|
+fn yy_action_236(
+  _last_pos : @basic.Position,
+  _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
+) -> YYObj {
+  YYObj__list_List_QualifiedName_(
+    {
+      ()
+      @list.empty()
+    },
+  )
+}
+
+// file:///./mbti_parser.mbty
+// 229|    attributes vis "trait" uident {
+// 230|    TraitSig::{ attrs : $1, vis: $2, name: $4, super_traits: @list.empty(), methods: @list.empty() } 
+// 231|  }
+
+///|
+fn yy_action_237(
+  _last_pos : @basic.Position,
+  _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
+) -> YYObj {
+  let _sub_action_0_result = yy_action_14(_last_pos, _args[0:0])
+  let _sub_action_1_result = yy_action_15(_last_pos, _args[0:0])
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _sub_action_1_result is YYObj_Visibility(_dollar2)
+  guard _args[1].0 is YYObj_Name(_dollar4)
+  YYObj_TraitSig(
+    {
+      ()
+      TraitSig::{
+        attrs: _dollar1,
+        vis: _dollar2,
+        name: _dollar4,
+        super_traits: @list.empty(),
+        methods: @list.empty(),
+      }
+    },
+  )
+}
+
+// file:///./mbti_parser.mbty
+// 242|    attributes "fnalias" uident "::" lident {
+// 243|    FuncAlias(attrs = $1,name=$5, type_name=$3)
+// 244|  }
+
+///|
+fn yy_action_238(
+  _last_pos : @basic.Position,
+  _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
+) -> YYObj {
+  let _sub_action_0_result = yy_action_14(_last_pos, _args[0:0])
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  guard _args[3].0 is YYObj_Name(_dollar5)
+  guard _args[1].0 is YYObj_Name(_dollar3)
+  YYObj_AliasSig(
+    {
+      ()
+      FuncAlias(attrs=_dollar1, name=_dollar5, type_name=_dollar3)
+    },
+  )
+}
+
+// file:///./mbti_parser.mbty
+// 431|    LIDENT { Name::{name: $1, loc: mk_loc($sloc)} }
+
+///|
+fn yy_action_239(
+  _last_pos : @basic.Position,
+  _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
+) -> YYObj {
+  guard _args[0].0 is YYObj_String(_dollar1)
+  let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
+  let _end_pos = if _args.length() == 0 {
+    _last_pos
+  } else {
+    _args[_args.length() - 1].2
+  }
+  YYObj_Name(
+    {
+      ()
+      Name::{ name: _dollar1, loc: mk_loc((_symbol_start_pos, _end_pos)) }
+    },
+  )
+}
+
+// file:///./mbti_parser.mbty
+// 245|    attributes vis "using" PACKAGE_NAME "{" "type" uident using_binder "}" {
+// 246|    let pkg = Name::{ name : $4, loc : mk_loc($loc($4)) }
+// 247|    Using(pkg~, target = $7, name = $8, kind = Type, attrs = $1)
+// 248|  }
+
+///|
+fn yy_action_240(
+  _last_pos : @basic.Position,
+  _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
+) -> YYObj {
+  let _sub_action_0_result = yy_action_14(_last_pos, _args[0:0])
+  let _sub_action_1_result = yy_action_15(_last_pos, _args[0:0])
+  guard _args[1].0 is YYObj_String(_dollar4)
+  let _start_pos_of_item3 = _args[1].1
+  let _end_pos_of_item3 = _args[1].2
+  guard _args[4].0 is YYObj_Name(_dollar7)
+  guard _args[5].0 is YYObj_Name_(_dollar8)
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  YYObj_AliasSig(
+    {
+      ()
+      let pkg = Name::{
+        name: _dollar4,
+        loc: mk_loc((_start_pos_of_item3, _end_pos_of_item3)),
+      }
+      Using(pkg~, target=_dollar7, name=_dollar8, kind=Type, attrs=_dollar1)
+    },
+  )
+}
+
+// file:///./mbti_parser.mbty
+// 236|    "as" uident { Some($2) }
+
+///|
+fn yy_action_241(
+  _last_pos : @basic.Position,
+  _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
+) -> YYObj {
+  guard _args[1].0 is YYObj_Name(_dollar2)
+  YYObj_Name_(
+    {
+      ()
+      Some(_dollar2)
+    },
+  )
+}
+
+// file:///./mbti_parser.mbty
+// 249|    attributes vis "using" PACKAGE_NAME "{" "trait" uident using_binder "}" {
+// 250|    let pkg = Name::{ name : $4, loc : mk_loc($loc($4)) }
+// 251|    Using(pkg~, target = $7, name = $8, kind = Trait, attrs = $1)
+// 252|  }
+
+///|
+fn yy_action_242(
+  _last_pos : @basic.Position,
+  _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
+) -> YYObj {
+  let _sub_action_0_result = yy_action_14(_last_pos, _args[0:0])
+  let _sub_action_1_result = yy_action_15(_last_pos, _args[0:0])
+  guard _args[1].0 is YYObj_String(_dollar4)
+  let _start_pos_of_item3 = _args[1].1
+  let _end_pos_of_item3 = _args[1].2
+  guard _args[4].0 is YYObj_Name(_dollar7)
+  guard _args[5].0 is YYObj_Name_(_dollar8)
+  guard _sub_action_0_result is YYObj__list_List_Attribute_(_dollar1)
+  YYObj_AliasSig(
+    {
+      ()
+      let pkg = Name::{
+        name: _dollar4,
+        loc: mk_loc((_start_pos_of_item3, _end_pos_of_item3)),
+      }
+      Using(pkg~, target=_dollar7, name=_dollar8, kind=Trait, attrs=_dollar1)
+    },
+  )
+}
+
+// file:///./mbti_parser.mbty
+// 400|    { Default }
+
+///|
+fn yy_action_15(
+  _last_pos : @basic.Position,
+  _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
+) -> YYObj {
+  YYObj_Visibility(
+    {
+      ()
+      Default
+    },
+  )
+}
+
+// file:///./mbti_parser.mbty
+// 443|     {  @list.empty() }
+
+///|
+fn yy_action_14(
+  _last_pos : @basic.Position,
+  _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
+) -> YYObj {
+  YYObj__list_List_Attribute_(
+    {
+      ()
+      @list.empty()
+    },
+  )
+}
+
+// file:///./mbti_parser.mbty
+// 235|    { None }
+
+///|
+fn yy_action_243(
+  _last_pos : @basic.Position,
+  _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
+) -> YYObj {
+  YYObj_Name_(
+    {
+      ()
+      None
+    },
+  )
+}
+
+// file:///./mbti_parser.mbty
+// 427|    UIDENT { Name::{name: $1, loc: mk_loc($sloc)} }
+
+///|
+fn yy_action_244(
+  _last_pos : @basic.Position,
+  _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
+) -> YYObj {
+  guard _args[0].0 is YYObj_String(_dollar1)
+  let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
+  let _end_pos = if _args.length() == 0 {
+    _last_pos
+  } else {
+    _args[_args.length() - 1].2
+  }
+  YYObj_Name(
+    {
+      ()
+      Name::{ name: _dollar1, loc: mk_loc((_symbol_start_pos, _end_pos)) }
+    },
+  )
+}
+
+// file:///./stdlib.mbty
+// 50|    X nonempty_list(X) { $2.add($1) }
+
+///|
+fn yy_action_245(
+  _last_pos : @basic.Position,
+  _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
+) -> YYObj {
+  let _sub_action_0_result = yy_action_246(_last_pos, _args[0:1])
+  guard _args[1].0 is YYObj__list_List_Attribute_(_dollar2)
+  guard _sub_action_0_result is YYObj_Attribute(_dollar1)
+  YYObj__list_List_Attribute_(
+    {
+      ()
+      _dollar2.add(_dollar1)
+    },
+  )
+}
+
+// file:///./stdlib.mbty
+// 49|    X { @list.singleton($1) }
+
+///|
+fn yy_action_247(
+  _last_pos : @basic.Position,
+  _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
+) -> YYObj {
+  let _sub_action_0_result = yy_action_246(_last_pos, _args[0:1])
+  guard _sub_action_0_result is YYObj_Attribute(_dollar1)
+  YYObj__list_List_Attribute_(
+    {
+      ()
+      @list.singleton(_dollar1)
+    },
+  )
+}
+
+// file:///./mbti_parser.mbty
+// 448|    ATTRIBUTE { Attribute::new(loc=mk_loc($sloc), $1) }
+
+///|
+fn yy_action_246(
+  _last_pos : @basic.Position,
+  _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
+) -> YYObj {
+  let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
+  let _end_pos = if _args.length() == 0 {
+    _last_pos
+  } else {
+    _args[_args.length() - 1].2
+  }
+  guard _args[0].0 is YYObj__String__Option_String___String_(_dollar1)
+  YYObj_Attribute(
+    {
+      ()
+      Attribute::new(loc=mk_loc((_symbol_start_pos, _end_pos)), _dollar1)
+    },
+  )
+}
+
+// file:///./mbti_parser.mbty
+// 138|     { @list.empty() }
+
+///|
+fn yy_action_248(
+  _last_pos : @basic.Position,
+  _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
+) -> YYObj {
+  YYObj__list_List__Sig__Location__(
+    {
+      ()
+      @list.empty()
+    },
+  )
+}
+
+// file:///./mbti_parser.mbty
+// 129|    "import" "{" separated_nonempty_list(",", package_import) "}" ";" { $3 }
+
+///|
+fn yy_action_249(
+  _last_pos : @basic.Position,
+  _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
+) -> YYObj {
+  guard _args[2].0 is YYObj__list_List_PackageImport_(_dollar3)
+  YYObj__list_List_PackageImport_(
+    {
+      ()
+      _dollar3
+    },
+  )
+}
+
+// file:///./mbti_parser.mbty
+// 134|    STRING "as" LIDENT { PackageImport::{name: $1, alias_: Some($3)} }
+
+///|
+fn yy_action_250(
+  _last_pos : @basic.Position,
+  _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
+) -> YYObj {
+  guard _args[0].0 is YYObj_StringLiteral(_dollar1)
+  guard _args[2].0 is YYObj_String(_dollar3)
+  YYObj_PackageImport(
+    {
+      ()
+      PackageImport::{ name: _dollar1, alias_: Some(_dollar3) }
+    },
+  )
+}
+
+// file:///./mbti_parser.mbty
+// 133|    STRING { PackageImport::{name: $1, alias_: None} }
+
+///|
+fn yy_action_251(
+  _last_pos : @basic.Position,
+  _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
+) -> YYObj {
+  guard _args[0].0 is YYObj_StringLiteral(_dollar1)
+  YYObj_PackageImport(
+    {
+      ()
+      PackageImport::{ name: _dollar1, alias_: None }
+    },
+  )
+}
+
+// file:///./stdlib.mbty
+// 60|    X SEP separated_nonempty_list(SEP, X) { $3.add($1) }
+
+///|
+fn yy_action_252(
+  _last_pos : @basic.Position,
+  _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
+) -> YYObj {
+  guard _args[2].0 is YYObj__list_List_PackageImport_(_dollar3)
+  guard _args[0].0 is YYObj_PackageImport(_dollar1)
+  YYObj__list_List_PackageImport_(
+    {
+      ()
+      _dollar3.add(_dollar1)
+    },
+  )
+}
+
+// file:///./stdlib.mbty
+// 59|    X { @list.singleton($1) }
+
+///|
+fn yy_action_253(
+  _last_pos : @basic.Position,
+  _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
+) -> YYObj {
+  guard _args[0].0 is YYObj_PackageImport(_dollar1)
+  YYObj__list_List_PackageImport_(
+    {
+      ()
+      @list.singleton(_dollar1)
+    },
+  )
+}
+
+// file:///./mbti_parser.mbty
+// 128|     { @list.empty() }
+
+///|
+fn yy_action_254(
+  _last_pos : @basic.Position,
+  _args : ArrayView[(YYObj, @basic.Position, @basic.Position)],
+) -> YYObj {
+  YYObj__list_List_PackageImport_(
+    {
+      ()
+      @list.empty()
+    },
+  )
+}
+
+///|
+fn yy_input(
+  token : Token,
+  _start_pos : @basic.Position,
+  _end_pos : @basic.Position,
+) -> (YYSymbol, YYObj) {
+  match token {
+    CHAR(data) => (T_CHAR, YYObj_CharLiteral(data))
+    INT(data) => (T_INT, YYObj_String(data))
+    BYTE(data) => (T_BYTE, YYObj_CharLiteral(data))
+    BYTES(data) => (T_BYTES, YYObj_StringLiteral(data))
+    FLOAT(data) => (T_FLOAT, YYObj_String(data))
+    DOUBLE(data) => (T_DOUBLE, YYObj_String(data))
+    STRING(data) => (T_STRING, YYObj_StringLiteral(data))
+    MULTILINE_STRING(data) => (T_MULTILINE_STRING, YYObj_String(data))
+    MULTILINE_INTERP(data) => (T_MULTILINE_INTERP, YYObj_InterpLiteral(data))
+    INTERP(data) => (T_INTERP, YYObj_InterpLiteral(data))
+    REGEX_LITERAL(data) => (T_REGEX_LITERAL, YYObj_String(data))
+    REGEX_INTERP(data) => (T_REGEX_INTERP, YYObj_InterpLiteral(data))
+    ATTRIBUTE(data) =>
+      (T_ATTRIBUTE, YYObj__String__Option_String___String_(data))
+    LIDENT(data) => (T_LIDENT, YYObj_String(data))
+    UIDENT(data) => (T_UIDENT, YYObj_String(data))
+    POST_LABEL(data) => (T_POST_LABEL, YYObj_String(data))
+    COMMENT(data) => (T_COMMENT, YYObj_Comment(data))
+    NEWLINE => (T_NEWLINE, YYObj_Void)
+    INFIX1(data) => (T_INFIX1, YYObj_String(data))
+    INFIX2(data) => (T_INFIX2, YYObj_String(data))
+    INFIX3(data) => (T_INFIX3, YYObj_String(data))
+    INFIX4(data) => (T_INFIX4, YYObj_String(data))
+    AUGMENTED_ASSIGNMENT(data) => (T_AUGMENTED_ASSIGNMENT, YYObj_String(data))
+    EOF => (T_EOF, YYObj_Void)
+    FALSE => (T_FALSE, YYObj_Void)
+    TRUE => (T_TRUE, YYObj_Void)
+    PUB => (T_PUB, YYObj_Void)
+    PRIV => (T_PRIV, YYObj_Void)
+    READONLY => (T_READONLY, YYObj_Void)
+    IMPORT => (T_IMPORT, YYObj_Void)
+    EXTERN => (T_EXTERN, YYObj_Void)
+    BREAK => (T_BREAK, YYObj_Void)
+    CONTINUE => (T_CONTINUE, YYObj_Void)
+    STRUCT => (T_STRUCT, YYObj_Void)
+    ENUM => (T_ENUM, YYObj_Void)
+    TRAIT => (T_TRAIT, YYObj_Void)
+    DERIVE => (T_DERIVE, YYObj_Void)
+    IMPL => (T_IMPL, YYObj_Void)
+    WITH => (T_WITH, YYObj_Void)
+    RAISE => (T_RAISE, YYObj_Void)
+    THROW => (T_THROW, YYObj_Void)
+    TRY => (T_TRY, YYObj_Void)
+    CATCH => (T_CATCH, YYObj_Void)
+    ASYNC => (T_ASYNC, YYObj_Void)
+    TYPEALIAS => (T_TYPEALIAS, YYObj_Void)
+    TRAITALIAS => (T_TRAITALIAS, YYObj_Void)
+    FNALIAS => (T_FNALIAS, YYObj_Void)
+    EQUAL => (T_EQUAL, YYObj_Void)
+    LPAREN => (T_LPAREN, YYObj_Void)
+    RPAREN => (T_RPAREN, YYObj_Void)
+    COMMA => (T_COMMA, YYObj_Void)
+    MINUS => (T_MINUS, YYObj_Void)
     QUESTION => (T_QUESTION, YYObj_Void)
     EXCLAMATION => (T_EXCLAMATION, YYObj_Void)
     DOT_LIDENT(data) => (T_DOT_LIDENT, YYObj_String(data))
@@ -4876,5685 +6773,10360 @@ fn yy_input(
     USING => (T_USING, YYObj_Void)
     DECLARE => (T_DECLARE, YYObj_Void)
     NORAISE => (T_NORAISE, YYObj_Void)
+    NOBREAK => (T_NOBREAK, YYObj_Void)
     WHERE => (T_WHERE, YYObj_Void)
     ENUMVIEW => (T_ENUMVIEW, YYObj_Void)
     TRY_QUESTION => (T_TRY_QUESTION, YYObj_Void)
     TRY_EXCLAMATION => (T_TRY_EXCLAMATION, YYObj_Void)
     LEXMATCH => (T_LEXMATCH, YYObj_Void)
     LEXMATCH_QUESTION => (T_LEXMATCH_QUESTION, YYObj_Void)
+    PACKAGE => (T_PACKAGE, YYObj_Void)
+  }
+}
+
+// [0, mbti → • PACKAGE STRING imports sigs EOF, $]
+// [1, mbti → • PACKAGE STRING SEMI imports sigs EOF, $]
+// [239, mbti_prime → • mbti, $]
+
+///|
+fn yy_state_0(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    NT_mbti => Shift(yy_state_1)
+    T_PACKAGE => Shift(yy_state_2)
+    _ => Error
+  }
+}
+
+// [239, mbti_prime → mbti •, $]
+
+///|
+fn yy_state_1(_lookahead : YYSymbol) -> YYDecision {
+  Accept
+}
+
+// [0, mbti → PACKAGE • STRING imports sigs EOF, $]
+// [1, mbti → PACKAGE • STRING SEMI imports sigs EOF, $]
+
+///|
+fn yy_state_2(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_STRING => Shift(yy_state_3)
+    _ => Error
+  }
+}
+
+// [0, mbti → PACKAGE STRING • imports sigs EOF, $]
+// [1, mbti → PACKAGE STRING • SEMI imports sigs EOF, $]
+// [2, imports → •, ATTRIBUTE / EOF / PUB / PRIV / STRUCT / ENUM / TRAIT / IMPL / ASYNC / FNALIAS / FN / LET / CONST / TYPE / SUBERROR / USING]
+// [3, imports → • IMPORT LBRACE separated_nonempty_list(COMMA,package_import) RBRACE SEMI, ATTRIBUTE / EOF / PUB / PRIV / STRUCT / ENUM / TRAIT / IMPL / ASYNC / FNALIAS / FN / LET / CONST / TYPE / SUBERROR / USING]
+
+///|
+fn yy_state_3(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_IMPORT => Shift(yy_state_4)
+    T_SEMI => Shift(yy_state_15)
+    NT_imports => Shift(yy_state_660)
+    T_ATTRIBUTE
+    | T_EOF
+    | T_PUB
+    | T_PRIV
+    | T_STRUCT
+    | T_ENUM
+    | T_TRAIT
+    | T_IMPL
+    | T_ASYNC
+    | T_FNALIAS
+    | T_FN
+    | T_LET
+    | T_CONST
+    | T_TYPE
+    | T_SUBERROR
+    | T_USING => Reduce(0, NT_imports, yy_action_254)
+    _ => Error
+  }
+}
+
+// [3, imports → IMPORT • LBRACE separated_nonempty_list(COMMA,package_import) RBRACE SEMI, ATTRIBUTE / EOF / PUB / PRIV / STRUCT / ENUM / TRAIT / IMPL / ASYNC / FNALIAS / FN / LET / CONST / TYPE / SUBERROR / USING]
+
+///|
+fn yy_state_4(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_LBRACE => Shift(yy_state_5)
+    _ => Error
+  }
+}
+
+// [3, imports → IMPORT LBRACE • separated_nonempty_list(COMMA,package_import) RBRACE SEMI, ATTRIBUTE / EOF / PUB / PRIV / STRUCT / ENUM / TRAIT / IMPL / ASYNC / FNALIAS / FN / LET / CONST / TYPE / SUBERROR / USING]
+// [4, package_import → • STRING, COMMA / RBRACE]
+// [5, package_import → • STRING AS LIDENT, COMMA / RBRACE]
+// [191, separated_nonempty_list(COMMA,package_import) → • package_import, RBRACE]
+// [192, separated_nonempty_list(COMMA,package_import) → • package_import COMMA separated_nonempty_list(COMMA,package_import), RBRACE]
+
+///|
+fn yy_state_5(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    NT_package_import => Shift(yy_state_6)
+    T_STRING => Shift(yy_state_9)
+    NT_separated_nonempty_list_COMMA_package_import_ => Shift(yy_state_12)
+    _ => Error
+  }
+}
+
+// [191, separated_nonempty_list(COMMA,package_import) → package_import •, RBRACE]
+// [192, separated_nonempty_list(COMMA,package_import) → package_import • COMMA separated_nonempty_list(COMMA,package_import), RBRACE]
+
+///|
+fn yy_state_6(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_COMMA => Shift(yy_state_7)
+    T_RBRACE =>
+      Reduce(1, NT_separated_nonempty_list_COMMA_package_import_, yy_action_253)
+    _ => Error
+  }
+}
+
+// [4, package_import → • STRING, COMMA / RBRACE]
+// [5, package_import → • STRING AS LIDENT, COMMA / RBRACE]
+// [191, separated_nonempty_list(COMMA,package_import) → • package_import, RBRACE]
+// [192, separated_nonempty_list(COMMA,package_import) → • package_import COMMA separated_nonempty_list(COMMA,package_import), RBRACE]
+// [192, separated_nonempty_list(COMMA,package_import) → package_import COMMA • separated_nonempty_list(COMMA,package_import), RBRACE]
+
+///|
+fn yy_state_7(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    NT_package_import => Shift(yy_state_6)
+    NT_separated_nonempty_list_COMMA_package_import_ => Shift(yy_state_8)
+    T_STRING => Shift(yy_state_9)
+    _ => Error
+  }
+}
+
+// [192, separated_nonempty_list(COMMA,package_import) → package_import COMMA separated_nonempty_list(COMMA,package_import) •, RBRACE]
+
+///|
+fn yy_state_8(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(
+    3,
+    NT_separated_nonempty_list_COMMA_package_import_,
+    yy_action_252,
+  )
+}
+
+// [4, package_import → STRING •, COMMA / RBRACE]
+// [5, package_import → STRING • AS LIDENT, COMMA / RBRACE]
+
+///|
+fn yy_state_9(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_AS => Shift(yy_state_10)
+    T_COMMA | T_RBRACE => Reduce(1, NT_package_import, yy_action_251)
+    _ => Error
+  }
+}
+
+// [5, package_import → STRING AS • LIDENT, COMMA / RBRACE]
+
+///|
+fn yy_state_10(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_LIDENT => Shift(yy_state_11)
+    _ => Error
+  }
+}
+
+// [5, package_import → STRING AS LIDENT •, COMMA / RBRACE]
+
+///|
+fn yy_state_11(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(3, NT_package_import, yy_action_250)
+}
+
+// [3, imports → IMPORT LBRACE separated_nonempty_list(COMMA,package_import) • RBRACE SEMI, ATTRIBUTE / EOF / PUB / PRIV / STRUCT / ENUM / TRAIT / IMPL / ASYNC / FNALIAS / FN / LET / CONST / TYPE / SUBERROR / USING]
+
+///|
+fn yy_state_12(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_RBRACE => Shift(yy_state_13)
+    _ => Error
+  }
+}
+
+// [3, imports → IMPORT LBRACE separated_nonempty_list(COMMA,package_import) RBRACE • SEMI, ATTRIBUTE / EOF / PUB / PRIV / STRUCT / ENUM / TRAIT / IMPL / ASYNC / FNALIAS / FN / LET / CONST / TYPE / SUBERROR / USING]
+
+///|
+fn yy_state_13(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_SEMI => Shift(yy_state_14)
+    _ => Error
+  }
+}
+
+// [3, imports → IMPORT LBRACE separated_nonempty_list(COMMA,package_import) RBRACE SEMI •, ATTRIBUTE / EOF / PUB / PRIV / STRUCT / ENUM / TRAIT / IMPL / ASYNC / FNALIAS / FN / LET / CONST / TYPE / SUBERROR / USING]
+
+///|
+fn yy_state_14(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(5, NT_imports, yy_action_249)
+}
+
+// [1, mbti → PACKAGE STRING SEMI • imports sigs EOF, $]
+// [2, imports → •, ATTRIBUTE / EOF / PUB / PRIV / STRUCT / ENUM / TRAIT / IMPL / ASYNC / FNALIAS / FN / LET / CONST / TYPE / SUBERROR / USING]
+// [3, imports → • IMPORT LBRACE separated_nonempty_list(COMMA,package_import) RBRACE SEMI, ATTRIBUTE / EOF / PUB / PRIV / STRUCT / ENUM / TRAIT / IMPL / ASYNC / FNALIAS / FN / LET / CONST / TYPE / SUBERROR / USING]
+
+///|
+fn yy_state_15(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_IMPORT => Shift(yy_state_4)
+    NT_imports => Shift(yy_state_16)
+    T_ATTRIBUTE
+    | T_EOF
+    | T_PUB
+    | T_PRIV
+    | T_STRUCT
+    | T_ENUM
+    | T_TRAIT
+    | T_IMPL
+    | T_ASYNC
+    | T_FNALIAS
+    | T_FN
+    | T_LET
+    | T_CONST
+    | T_TYPE
+    | T_SUBERROR
+    | T_USING => Reduce(0, NT_imports, yy_action_254)
+    _ => Error
+  }
+}
+
+// [1, mbti → PACKAGE STRING SEMI imports • sigs EOF, $]
+// [6, sigs → •, EOF]
+// [7, sigs → • sig_, EOF]
+// [8, sigs → • sig_ SEMI sigs, EOF]
+// [9, sig_ → • func_sig, EOF / SEMI]
+// [10, sig_ → • type_sig, EOF / SEMI]
+// [11, sig_ → • alias_sig, EOF / SEMI]
+// [12, sig_ → • trait_sig, EOF / SEMI]
+// [13, sig_ → • impl_sig, EOF / SEMI]
+// [14, sig_ → • const_sig, EOF / SEMI]
+// [15, sig_ → • value_sig, EOF / SEMI]
+// [16, const_sig → • CONST uident COLON type_ EQUAL constant, EOF / SEMI]
+// [17, const_sig → • PRIV CONST uident COLON type_ EQUAL constant, EOF / SEMI]
+// [18, const_sig → • PUB pub_attr CONST uident COLON type_ EQUAL constant, EOF / SEMI]
+// [19, const_sig → • nonempty_list(attribute) CONST uident COLON type_ EQUAL constant, EOF / SEMI]
+// [20, const_sig → • nonempty_list(attribute) PRIV CONST uident COLON type_ EQUAL constant, EOF / SEMI]
+// [21, const_sig → • nonempty_list(attribute) PUB pub_attr CONST uident COLON type_ EQUAL constant, EOF / SEMI]
+// [22, value_sig → • LET lident COLON type_, EOF / SEMI]
+// [23, value_sig → • PRIV LET lident COLON type_, EOF / SEMI]
+// [24, value_sig → • PUB pub_attr LET lident COLON type_, EOF / SEMI]
+// [25, value_sig → • nonempty_list(attribute) LET lident COLON type_, EOF / SEMI]
+// [26, value_sig → • nonempty_list(attribute) PRIV LET lident COLON type_, EOF / SEMI]
+// [27, value_sig → • nonempty_list(attribute) PUB pub_attr LET lident COLON type_, EOF / SEMI]
+// [32, func_sig → • ASYNC FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [33, func_sig → • FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [34, func_sig → • nonempty_list(attribute) ASYNC FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [35, func_sig → • nonempty_list(attribute) FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [38, type_sig → • TYPE type_decl_name_with_params, EOF / SEMI]
+// [39, type_sig → • PRIV TYPE type_decl_name_with_params, EOF / SEMI]
+// [40, type_sig → • PUB pub_attr TYPE type_decl_name_with_params, EOF / SEMI]
+// [41, type_sig → • nonempty_list(attribute) TYPE type_decl_name_with_params, EOF / SEMI]
+// [42, type_sig → • nonempty_list(attribute) PRIV TYPE type_decl_name_with_params, EOF / SEMI]
+// [43, type_sig → • nonempty_list(attribute) PUB pub_attr TYPE type_decl_name_with_params, EOF / SEMI]
+// [44, type_sig → • SUBERROR uident option(type_), EOF / SEMI]
+// [45, type_sig → • PRIV SUBERROR uident option(type_), EOF / SEMI]
+// [46, type_sig → • PUB pub_attr SUBERROR uident option(type_), EOF / SEMI]
+// [47, type_sig → • nonempty_list(attribute) SUBERROR uident option(type_), EOF / SEMI]
+// [48, type_sig → • nonempty_list(attribute) PRIV SUBERROR uident option(type_), EOF / SEMI]
+// [49, type_sig → • nonempty_list(attribute) PUB pub_attr SUBERROR uident option(type_), EOF / SEMI]
+// [50, type_sig → • SUBERROR uident LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [51, type_sig → • PRIV SUBERROR uident LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [52, type_sig → • PUB pub_attr SUBERROR uident LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [53, type_sig → • nonempty_list(attribute) SUBERROR uident LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [54, type_sig → • nonempty_list(attribute) PRIV SUBERROR uident LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [55, type_sig → • nonempty_list(attribute) PUB pub_attr SUBERROR uident LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [56, type_sig → • STRUCT type_decl_name_with_params LBRACE record_decl_body RBRACE, EOF / SEMI]
+// [57, type_sig → • PRIV STRUCT type_decl_name_with_params LBRACE record_decl_body RBRACE, EOF / SEMI]
+// [58, type_sig → • PUB pub_attr STRUCT type_decl_name_with_params LBRACE record_decl_body RBRACE, EOF / SEMI]
+// [59, type_sig → • nonempty_list(attribute) STRUCT type_decl_name_with_params LBRACE record_decl_body RBRACE, EOF / SEMI]
+// [60, type_sig → • nonempty_list(attribute) PRIV STRUCT type_decl_name_with_params LBRACE record_decl_body RBRACE, EOF / SEMI]
+// [61, type_sig → • nonempty_list(attribute) PUB pub_attr STRUCT type_decl_name_with_params LBRACE record_decl_body RBRACE, EOF / SEMI]
+// [62, type_sig → • STRUCT type_decl_name_with_params LPAREN separated_list(COMMA,type_) RPAREN, EOF / SEMI]
+// [63, type_sig → • PRIV STRUCT type_decl_name_with_params LPAREN separated_list(COMMA,type_) RPAREN, EOF / SEMI]
+// [64, type_sig → • PUB pub_attr STRUCT type_decl_name_with_params LPAREN separated_list(COMMA,type_) RPAREN, EOF / SEMI]
+// [65, type_sig → • nonempty_list(attribute) STRUCT type_decl_name_with_params LPAREN separated_list(COMMA,type_) RPAREN, EOF / SEMI]
+// [66, type_sig → • nonempty_list(attribute) PRIV STRUCT type_decl_name_with_params LPAREN separated_list(COMMA,type_) RPAREN, EOF / SEMI]
+// [67, type_sig → • nonempty_list(attribute) PUB pub_attr STRUCT type_decl_name_with_params LPAREN separated_list(COMMA,type_) RPAREN, EOF / SEMI]
+// [68, type_sig → • ENUM type_decl_name_with_params LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [69, type_sig → • PRIV ENUM type_decl_name_with_params LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [70, type_sig → • PUB pub_attr ENUM type_decl_name_with_params LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [71, type_sig → • nonempty_list(attribute) ENUM type_decl_name_with_params LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [72, type_sig → • nonempty_list(attribute) PRIV ENUM type_decl_name_with_params LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [73, type_sig → • nonempty_list(attribute) PUB pub_attr ENUM type_decl_name_with_params LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [74, impl_sig → • IMPL type_params_with_constraints qualified_uident FOR type_, EOF / SEMI]
+// [75, impl_sig → • PRIV IMPL type_params_with_constraints qualified_uident FOR type_, EOF / SEMI]
+// [76, impl_sig → • PUB pub_attr IMPL type_params_with_constraints qualified_uident FOR type_, EOF / SEMI]
+// [77, impl_sig → • nonempty_list(attribute) IMPL type_params_with_constraints qualified_uident FOR type_, EOF / SEMI]
+// [78, impl_sig → • nonempty_list(attribute) PRIV IMPL type_params_with_constraints qualified_uident FOR type_, EOF / SEMI]
+// [79, impl_sig → • nonempty_list(attribute) PUB pub_attr IMPL type_params_with_constraints qualified_uident FOR type_, EOF / SEMI]
+// [80, impl_sig → • IMPL qualified_uident FOR type_, EOF / SEMI]
+// [81, impl_sig → • PRIV IMPL qualified_uident FOR type_, EOF / SEMI]
+// [82, impl_sig → • PUB pub_attr IMPL qualified_uident FOR type_, EOF / SEMI]
+// [83, impl_sig → • nonempty_list(attribute) IMPL qualified_uident FOR type_, EOF / SEMI]
+// [84, impl_sig → • nonempty_list(attribute) PRIV IMPL qualified_uident FOR type_, EOF / SEMI]
+// [85, impl_sig → • nonempty_list(attribute) PUB pub_attr IMPL qualified_uident FOR type_, EOF / SEMI]
+// [86, trait_sig → • TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
+// [87, trait_sig → • PRIV TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
+// [88, trait_sig → • PUB pub_attr TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
+// [89, trait_sig → • nonempty_list(attribute) TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
+// [90, trait_sig → • nonempty_list(attribute) PRIV TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
+// [91, trait_sig → • nonempty_list(attribute) PUB pub_attr TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
+// [92, trait_sig → • TRAIT uident, EOF / SEMI]
+// [93, trait_sig → • PRIV TRAIT uident, EOF / SEMI]
+// [94, trait_sig → • PUB pub_attr TRAIT uident, EOF / SEMI]
+// [95, trait_sig → • nonempty_list(attribute) TRAIT uident, EOF / SEMI]
+// [96, trait_sig → • nonempty_list(attribute) PRIV TRAIT uident, EOF / SEMI]
+// [97, trait_sig → • nonempty_list(attribute) PUB pub_attr TRAIT uident, EOF / SEMI]
+// [100, alias_sig → • TYPE type_decl_name_with_params EQUAL type_, EOF / SEMI]
+// [101, alias_sig → • PRIV TYPE type_decl_name_with_params EQUAL type_, EOF / SEMI]
+// [102, alias_sig → • PUB pub_attr TYPE type_decl_name_with_params EQUAL type_, EOF / SEMI]
+// [103, alias_sig → • nonempty_list(attribute) TYPE type_decl_name_with_params EQUAL type_, EOF / SEMI]
+// [104, alias_sig → • nonempty_list(attribute) PRIV TYPE type_decl_name_with_params EQUAL type_, EOF / SEMI]
+// [105, alias_sig → • nonempty_list(attribute) PUB pub_attr TYPE type_decl_name_with_params EQUAL type_, EOF / SEMI]
+// [106, alias_sig → • FNALIAS uident COLONCOLON lident, EOF / SEMI]
+// [107, alias_sig → • nonempty_list(attribute) FNALIAS uident COLONCOLON lident, EOF / SEMI]
+// [108, alias_sig → • USING PACKAGE_NAME LBRACE TYPE uident using_binder RBRACE, EOF / SEMI]
+// [109, alias_sig → • PRIV USING PACKAGE_NAME LBRACE TYPE uident using_binder RBRACE, EOF / SEMI]
+// [110, alias_sig → • PUB pub_attr USING PACKAGE_NAME LBRACE TYPE uident using_binder RBRACE, EOF / SEMI]
+// [111, alias_sig → • nonempty_list(attribute) USING PACKAGE_NAME LBRACE TYPE uident using_binder RBRACE, EOF / SEMI]
+// [112, alias_sig → • nonempty_list(attribute) PRIV USING PACKAGE_NAME LBRACE TYPE uident using_binder RBRACE, EOF / SEMI]
+// [113, alias_sig → • nonempty_list(attribute) PUB pub_attr USING PACKAGE_NAME LBRACE TYPE uident using_binder RBRACE, EOF / SEMI]
+// [114, alias_sig → • USING PACKAGE_NAME LBRACE TRAIT uident using_binder RBRACE, EOF / SEMI]
+// [115, alias_sig → • PRIV USING PACKAGE_NAME LBRACE TRAIT uident using_binder RBRACE, EOF / SEMI]
+// [116, alias_sig → • PUB pub_attr USING PACKAGE_NAME LBRACE TRAIT uident using_binder RBRACE, EOF / SEMI]
+// [117, alias_sig → • nonempty_list(attribute) USING PACKAGE_NAME LBRACE TRAIT uident using_binder RBRACE, EOF / SEMI]
+// [118, alias_sig → • nonempty_list(attribute) PRIV USING PACKAGE_NAME LBRACE TRAIT uident using_binder RBRACE, EOF / SEMI]
+// [119, alias_sig → • nonempty_list(attribute) PUB pub_attr USING PACKAGE_NAME LBRACE TRAIT uident using_binder RBRACE, EOF / SEMI]
+// [229, nonempty_list(attribute) → • ATTRIBUTE, PUB / PRIV / STRUCT / ENUM / TRAIT / IMPL / ASYNC / FNALIAS / FN / LET / CONST / TYPE / SUBERROR / USING]
+// [230, nonempty_list(attribute) → • ATTRIBUTE nonempty_list(attribute), PUB / PRIV / STRUCT / ENUM / TRAIT / IMPL / ASYNC / FNALIAS / FN / LET / CONST / TYPE / SUBERROR / USING]
+
+///|
+fn yy_state_16(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_ATTRIBUTE => Shift(yy_state_17)
+    T_USING => Shift(yy_state_19)
+    T_FNALIAS => Shift(yy_state_33)
+    T_TRAIT => Shift(yy_state_38)
+    T_IMPL => Shift(yy_state_141)
+    T_ENUM => Shift(yy_state_163)
+    T_STRUCT => Shift(yy_state_205)
+    T_SUBERROR => Shift(yy_state_274)
+    T_TYPE => Shift(yy_state_281)
+    T_FN => Shift(yy_state_285)
+    T_ASYNC => Shift(yy_state_294)
+    T_LET => Shift(yy_state_304)
+    NT_nonempty_list_attribute_ => Shift(yy_state_308)
+    T_PUB => Shift(yy_state_523)
+    T_PRIV => Shift(yy_state_583)
+    T_CONST => Shift(yy_state_642)
+    NT_value_sig => Shift(yy_state_648)
+    NT_const_sig => Shift(yy_state_649)
+    NT_impl_sig => Shift(yy_state_650)
+    NT_trait_sig => Shift(yy_state_651)
+    NT_alias_sig => Shift(yy_state_652)
+    NT_type_sig => Shift(yy_state_653)
+    NT_func_sig => Shift(yy_state_654)
+    NT_sig_ => Shift(yy_state_655)
+    NT_sigs => Shift(yy_state_658)
+    T_EOF => Reduce(0, NT_sigs, yy_action_248)
+    _ => Error
+  }
+}
+
+// [229, nonempty_list(attribute) → • ATTRIBUTE, LIDENT / UIDENT / PUB / PRIV / STRUCT / ENUM / TRAIT / IMPL / ASYNC / FNALIAS / FN / LET / CONST / MUTABLE / TYPE / SUBERROR / USING]
+// [229, nonempty_list(attribute) → ATTRIBUTE •, LIDENT / UIDENT / PUB / PRIV / STRUCT / ENUM / TRAIT / IMPL / ASYNC / FNALIAS / FN / LET / CONST / MUTABLE / TYPE / SUBERROR / USING]
+// [230, nonempty_list(attribute) → • ATTRIBUTE nonempty_list(attribute), LIDENT / UIDENT / PUB / PRIV / STRUCT / ENUM / TRAIT / IMPL / ASYNC / FNALIAS / FN / LET / CONST / MUTABLE / TYPE / SUBERROR / USING]
+// [230, nonempty_list(attribute) → ATTRIBUTE • nonempty_list(attribute), LIDENT / UIDENT / PUB / PRIV / STRUCT / ENUM / TRAIT / IMPL / ASYNC / FNALIAS / FN / LET / CONST / MUTABLE / TYPE / SUBERROR / USING]
+
+///|
+fn yy_state_17(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_ATTRIBUTE => Shift(yy_state_17)
+    NT_nonempty_list_attribute_ => Shift(yy_state_18)
+    T_LIDENT
+    | T_UIDENT
+    | T_PUB
+    | T_PRIV
+    | T_STRUCT
+    | T_ENUM
+    | T_TRAIT
+    | T_IMPL
+    | T_ASYNC
+    | T_FNALIAS
+    | T_FN
+    | T_LET
+    | T_CONST
+    | T_MUTABLE
+    | T_TYPE
+    | T_SUBERROR
+    | T_USING => Reduce(1, NT_nonempty_list_attribute_, yy_action_247)
+    _ => Error
+  }
+}
+
+// [230, nonempty_list(attribute) → ATTRIBUTE nonempty_list(attribute) •, LIDENT / UIDENT / PUB / PRIV / STRUCT / ENUM / TRAIT / IMPL / ASYNC / FNALIAS / FN / LET / CONST / MUTABLE / TYPE / SUBERROR / USING]
+
+///|
+fn yy_state_18(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(2, NT_nonempty_list_attribute_, yy_action_245)
+}
+
+// [108, alias_sig → USING • PACKAGE_NAME LBRACE TYPE uident using_binder RBRACE, EOF / SEMI]
+// [114, alias_sig → USING • PACKAGE_NAME LBRACE TRAIT uident using_binder RBRACE, EOF / SEMI]
+
+///|
+fn yy_state_19(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_PACKAGE_NAME => Shift(yy_state_20)
+    _ => Error
+  }
+}
+
+// [108, alias_sig → USING PACKAGE_NAME • LBRACE TYPE uident using_binder RBRACE, EOF / SEMI]
+// [114, alias_sig → USING PACKAGE_NAME • LBRACE TRAIT uident using_binder RBRACE, EOF / SEMI]
+
+///|
+fn yy_state_20(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_LBRACE => Shift(yy_state_21)
+    _ => Error
+  }
+}
+
+// [108, alias_sig → USING PACKAGE_NAME LBRACE • TYPE uident using_binder RBRACE, EOF / SEMI]
+// [114, alias_sig → USING PACKAGE_NAME LBRACE • TRAIT uident using_binder RBRACE, EOF / SEMI]
+
+///|
+fn yy_state_21(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_TRAIT => Shift(yy_state_22)
+    T_TYPE => Shift(yy_state_29)
+    _ => Error
+  }
+}
+
+// [114, alias_sig → USING PACKAGE_NAME LBRACE TRAIT • uident using_binder RBRACE, EOF / SEMI]
+// [187, uident → • UIDENT, RBRACE / AS]
+
+///|
+fn yy_state_22(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_UIDENT => Shift(yy_state_23)
+    NT_uident => Shift(yy_state_24)
+    _ => Error
+  }
+}
+
+// [187, uident → UIDENT •, UIDENT / EOF / ASYNC / EQUAL / LPAREN / COMMA / COLONCOLON / COLON / SEMI / LBRACKET / RBRACKET / UNDERSCORE / LBRACE / RBRACE / AMPER / PACKAGE_NAME / AS]
+
+///|
+fn yy_state_23(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_uident, yy_action_244)
+}
+
+// [98, using_binder → •, RBRACE]
+// [99, using_binder → • AS uident, RBRACE]
+// [114, alias_sig → USING PACKAGE_NAME LBRACE TRAIT uident • using_binder RBRACE, EOF / SEMI]
+
+///|
+fn yy_state_24(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    NT_using_binder => Shift(yy_state_25)
+    T_AS => Shift(yy_state_27)
+    T_RBRACE => Reduce(0, NT_using_binder, yy_action_243)
+    _ => Error
+  }
+}
+
+// [114, alias_sig → USING PACKAGE_NAME LBRACE TRAIT uident using_binder • RBRACE, EOF / SEMI]
+
+///|
+fn yy_state_25(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_RBRACE => Shift(yy_state_26)
+    _ => Error
+  }
+}
+
+// [114, alias_sig → USING PACKAGE_NAME LBRACE TRAIT uident using_binder RBRACE •, EOF / SEMI]
+
+///|
+fn yy_state_26(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(7, NT_alias_sig, yy_action_242)
+}
+
+// [99, using_binder → AS • uident, RBRACE]
+// [187, uident → • UIDENT, RBRACE]
+
+///|
+fn yy_state_27(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_UIDENT => Shift(yy_state_23)
+    NT_uident => Shift(yy_state_28)
+    _ => Error
+  }
+}
+
+// [99, using_binder → AS uident •, RBRACE]
+
+///|
+fn yy_state_28(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(2, NT_using_binder, yy_action_241)
+}
+
+// [108, alias_sig → USING PACKAGE_NAME LBRACE TYPE • uident using_binder RBRACE, EOF / SEMI]
+// [187, uident → • UIDENT, RBRACE / AS]
+
+///|
+fn yy_state_29(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_UIDENT => Shift(yy_state_23)
+    NT_uident => Shift(yy_state_30)
+    _ => Error
+  }
+}
+
+// [98, using_binder → •, RBRACE]
+// [99, using_binder → • AS uident, RBRACE]
+// [108, alias_sig → USING PACKAGE_NAME LBRACE TYPE uident • using_binder RBRACE, EOF / SEMI]
+
+///|
+fn yy_state_30(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_AS => Shift(yy_state_27)
+    NT_using_binder => Shift(yy_state_31)
+    T_RBRACE => Reduce(0, NT_using_binder, yy_action_243)
+    _ => Error
+  }
+}
+
+// [108, alias_sig → USING PACKAGE_NAME LBRACE TYPE uident using_binder • RBRACE, EOF / SEMI]
+
+///|
+fn yy_state_31(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_RBRACE => Shift(yy_state_32)
+    _ => Error
+  }
+}
+
+// [108, alias_sig → USING PACKAGE_NAME LBRACE TYPE uident using_binder RBRACE •, EOF / SEMI]
+
+///|
+fn yy_state_32(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(7, NT_alias_sig, yy_action_240)
+}
+
+// [106, alias_sig → FNALIAS • uident COLONCOLON lident, EOF / SEMI]
+// [187, uident → • UIDENT, COLONCOLON]
+
+///|
+fn yy_state_33(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_UIDENT => Shift(yy_state_23)
+    NT_uident => Shift(yy_state_34)
+    _ => Error
+  }
+}
+
+// [106, alias_sig → FNALIAS uident • COLONCOLON lident, EOF / SEMI]
+
+///|
+fn yy_state_34(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_COLONCOLON => Shift(yy_state_35)
+    _ => Error
+  }
+}
+
+// [106, alias_sig → FNALIAS uident COLONCOLON • lident, EOF / SEMI]
+// [188, lident → • LIDENT, EOF / SEMI]
+
+///|
+fn yy_state_35(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_LIDENT => Shift(yy_state_36)
+    NT_lident => Shift(yy_state_37)
+    _ => Error
+  }
+}
+
+// [188, lident → LIDENT •, EOF / LPAREN / COLON / SEMI]
+
+///|
+fn yy_state_36(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_lident, yy_action_239)
+}
+
+// [106, alias_sig → FNALIAS uident COLONCOLON lident •, EOF / SEMI]
+
+///|
+fn yy_state_37(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(4, NT_alias_sig, yy_action_238)
+}
+
+// [86, trait_sig → TRAIT • uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
+// [92, trait_sig → TRAIT • uident, EOF / SEMI]
+// [187, uident → • UIDENT, EOF / COLON / SEMI / LBRACE]
+
+///|
+fn yy_state_38(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_UIDENT => Shift(yy_state_23)
+    NT_uident => Shift(yy_state_39)
+    _ => Error
+  }
+}
+
+// [86, trait_sig → TRAIT uident • loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
+// [92, trait_sig → TRAIT uident •, EOF / SEMI]
+// [209, loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) → •, LBRACE]
+// [210, loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) → • COLON separated_nonempty_list(PLUS,qualified_uident), LBRACE]
+
+///|
+fn yy_state_39(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_COLON => Shift(yy_state_40)
+    NT_loption_preceded_COLON_separated_nonempty_list_PLUS_qualified_uident___ =>
+      Shift(yy_state_48)
+    T_LBRACE =>
+      Reduce(
+        0,
+        NT_loption_preceded_COLON_separated_nonempty_list_PLUS_qualified_uident___,
+        yy_action_236,
+      )
+    T_EOF | T_SEMI => Reduce(2, NT_trait_sig, yy_action_237)
+    _ => Error
+  }
+}
+
+// [183, qualified_uident → • UIDENT, PLUS / LBRACE]
+// [184, qualified_uident → • PACKAGE_NAME DOT_UIDENT, PLUS / LBRACE]
+// [207, separated_nonempty_list(PLUS,qualified_uident) → • qualified_uident, LBRACE]
+// [208, separated_nonempty_list(PLUS,qualified_uident) → • qualified_uident PLUS separated_nonempty_list(PLUS,qualified_uident), LBRACE]
+// [210, loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) → COLON • separated_nonempty_list(PLUS,qualified_uident), LBRACE]
+
+///|
+fn yy_state_40(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    NT_separated_nonempty_list_PLUS_qualified_uident_ => Shift(yy_state_41)
+    NT_qualified_uident => Shift(yy_state_42)
+    T_PACKAGE_NAME => Shift(yy_state_45)
+    T_UIDENT => Shift(yy_state_47)
+    _ => Error
+  }
+}
+
+// [210, loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) → COLON separated_nonempty_list(PLUS,qualified_uident) •, LBRACE]
+
+///|
+fn yy_state_41(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(
+    2,
+    NT_loption_preceded_COLON_separated_nonempty_list_PLUS_qualified_uident___,
+    yy_action_234,
+  )
+}
+
+// [207, separated_nonempty_list(PLUS,qualified_uident) → qualified_uident •, LBRACE]
+// [208, separated_nonempty_list(PLUS,qualified_uident) → qualified_uident • PLUS separated_nonempty_list(PLUS,qualified_uident), LBRACE]
+
+///|
+fn yy_state_42(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_PLUS => Shift(yy_state_43)
+    T_LBRACE =>
+      Reduce(
+        1,
+        NT_separated_nonempty_list_PLUS_qualified_uident_,
+        yy_action_233,
+      )
+    _ => Error
+  }
+}
+
+// [183, qualified_uident → • UIDENT, PLUS / LBRACE]
+// [184, qualified_uident → • PACKAGE_NAME DOT_UIDENT, PLUS / LBRACE]
+// [207, separated_nonempty_list(PLUS,qualified_uident) → • qualified_uident, LBRACE]
+// [208, separated_nonempty_list(PLUS,qualified_uident) → • qualified_uident PLUS separated_nonempty_list(PLUS,qualified_uident), LBRACE]
+// [208, separated_nonempty_list(PLUS,qualified_uident) → qualified_uident PLUS • separated_nonempty_list(PLUS,qualified_uident), LBRACE]
+
+///|
+fn yy_state_43(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    NT_qualified_uident => Shift(yy_state_42)
+    NT_separated_nonempty_list_PLUS_qualified_uident_ => Shift(yy_state_44)
+    T_PACKAGE_NAME => Shift(yy_state_45)
+    T_UIDENT => Shift(yy_state_47)
+    _ => Error
+  }
+}
+
+// [208, separated_nonempty_list(PLUS,qualified_uident) → qualified_uident PLUS separated_nonempty_list(PLUS,qualified_uident) •, LBRACE]
+
+///|
+fn yy_state_44(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(
+    3,
+    NT_separated_nonempty_list_PLUS_qualified_uident_,
+    yy_action_232,
+  )
+}
+
+// [184, qualified_uident → PACKAGE_NAME • DOT_UIDENT, COMMA / PLUS / RBRACKET / LBRACE / FOR]
+
+///|
+fn yy_state_45(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_DOT_UIDENT => Shift(yy_state_46)
+    _ => Error
+  }
+}
+
+// [184, qualified_uident → PACKAGE_NAME DOT_UIDENT •, COMMA / PLUS / RBRACKET / LBRACE / FOR]
+
+///|
+fn yy_state_46(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(2, NT_qualified_uident, yy_action_231)
+}
+
+// [183, qualified_uident → UIDENT •, COMMA / PLUS / RBRACKET / LBRACE / FOR]
+
+///|
+fn yy_state_47(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_qualified_uident, yy_action_230)
+}
+
+// [86, trait_sig → TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) • LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
+
+///|
+fn yy_state_48(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_LBRACE => Shift(yy_state_49)
+    _ => Error
+  }
+}
+
+// [36, trait_method_sig → • lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type boption(eq_underscore), SEMI / RBRACE]
+// [37, trait_method_sig → • nonempty_list(attribute) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type boption(eq_underscore), SEMI / RBRACE]
+// [86, trait_sig → TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE • separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
+// [188, lident → • LIDENT, LPAREN]
+// [211, separated_nonempty_list(SEMI,trait_method_sig) → • trait_method_sig, RBRACE]
+// [212, separated_nonempty_list(SEMI,trait_method_sig) → • trait_method_sig SEMI separated_nonempty_list(SEMI,trait_method_sig), RBRACE]
+// [229, nonempty_list(attribute) → • ATTRIBUTE, LIDENT]
+// [230, nonempty_list(attribute) → • ATTRIBUTE nonempty_list(attribute), LIDENT]
+
+///|
+fn yy_state_49(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_ATTRIBUTE => Shift(yy_state_17)
+    T_LIDENT => Shift(yy_state_36)
+    NT_trait_method_sig => Shift(yy_state_50)
+    NT_nonempty_list_attribute_ => Shift(yy_state_53)
+    NT_lident => Shift(yy_state_132)
+    NT_separated_nonempty_list_SEMI_trait_method_sig_ => Shift(yy_state_139)
+    _ => Error
+  }
+}
+
+// [211, separated_nonempty_list(SEMI,trait_method_sig) → trait_method_sig •, RBRACE]
+// [212, separated_nonempty_list(SEMI,trait_method_sig) → trait_method_sig • SEMI separated_nonempty_list(SEMI,trait_method_sig), RBRACE]
+
+///|
+fn yy_state_50(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_SEMI => Shift(yy_state_51)
+    T_RBRACE =>
+      Reduce(
+        1,
+        NT_separated_nonempty_list_SEMI_trait_method_sig_,
+        yy_action_229,
+      )
+    _ => Error
+  }
+}
+
+// [36, trait_method_sig → • lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type boption(eq_underscore), SEMI / RBRACE]
+// [37, trait_method_sig → • nonempty_list(attribute) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type boption(eq_underscore), SEMI / RBRACE]
+// [188, lident → • LIDENT, LPAREN]
+// [211, separated_nonempty_list(SEMI,trait_method_sig) → • trait_method_sig, RBRACE]
+// [212, separated_nonempty_list(SEMI,trait_method_sig) → • trait_method_sig SEMI separated_nonempty_list(SEMI,trait_method_sig), RBRACE]
+// [212, separated_nonempty_list(SEMI,trait_method_sig) → trait_method_sig SEMI • separated_nonempty_list(SEMI,trait_method_sig), RBRACE]
+// [229, nonempty_list(attribute) → • ATTRIBUTE, LIDENT]
+// [230, nonempty_list(attribute) → • ATTRIBUTE nonempty_list(attribute), LIDENT]
+
+///|
+fn yy_state_51(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_ATTRIBUTE => Shift(yy_state_17)
+    T_LIDENT => Shift(yy_state_36)
+    NT_trait_method_sig => Shift(yy_state_50)
+    NT_separated_nonempty_list_SEMI_trait_method_sig_ => Shift(yy_state_52)
+    NT_nonempty_list_attribute_ => Shift(yy_state_53)
+    NT_lident => Shift(yy_state_132)
+    _ => Error
+  }
+}
+
+// [212, separated_nonempty_list(SEMI,trait_method_sig) → trait_method_sig SEMI separated_nonempty_list(SEMI,trait_method_sig) •, RBRACE]
+
+///|
+fn yy_state_52(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(
+    3,
+    NT_separated_nonempty_list_SEMI_trait_method_sig_,
+    yy_action_228,
+  )
+}
+
+// [37, trait_method_sig → nonempty_list(attribute) • lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type boption(eq_underscore), SEMI / RBRACE]
+// [188, lident → • LIDENT, LPAREN]
+
+///|
+fn yy_state_53(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_LIDENT => Shift(yy_state_36)
+    NT_lident => Shift(yy_state_54)
+    _ => Error
+  }
+}
+
+// [37, trait_method_sig → nonempty_list(attribute) lident • LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type boption(eq_underscore), SEMI / RBRACE]
+
+///|
+fn yy_state_54(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_LPAREN => Shift(yy_state_55)
+    _ => Error
+  }
+}
+
+// [37, trait_method_sig → nonempty_list(attribute) lident LPAREN • separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type boption(eq_underscore), SEMI / RBRACE]
+// [146, simple_type → • simple_type QUESTION, RPAREN / COMMA / QUESTION]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, RPAREN / COMMA / QUESTION]
+// [148, simple_type → • LPAREN type_ RPAREN, RPAREN / COMMA / QUESTION]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, RPAREN / COMMA / QUESTION]
+// [150, simple_type → • AMPER qualified_uident_, RPAREN / COMMA / QUESTION]
+// [151, simple_type → • UNDERSCORE, RPAREN / COMMA / QUESTION]
+// [152, type_ → • simple_type, RPAREN / COMMA]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [168, parameter → • type_, RPAREN / COMMA]
+// [169, parameter → • post_label COLON type_, RPAREN / COMMA]
+// [170, parameter → • label QUESTION COLON type_, RPAREN / COMMA]
+// [185, qualified_uident_ → • UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
+// [189, label → • LIDENT, QUESTION]
+// [190, post_label → • POST_LABEL, COLON]
+// [197, separated_list(COMMA,parameter) → •, RPAREN]
+// [198, separated_list(COMMA,parameter) → • separated_nonempty_list(COMMA,parameter), RPAREN]
+// [231, separated_nonempty_list(COMMA,parameter) → • parameter, RPAREN]
+// [232, separated_nonempty_list(COMMA,parameter) → • parameter COMMA separated_nonempty_list(COMMA,parameter), RPAREN]
+
+///|
+fn yy_state_55(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    NT_parameter => Shift(yy_state_56)
+    T_POST_LABEL => Shift(yy_state_59)
+    T_LIDENT => Shift(yy_state_60)
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    NT_label => Shift(yy_state_64)
+    T_ASYNC => Shift(yy_state_68)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_104)
+    NT_post_label => Shift(yy_state_120)
+    NT_type_ => Shift(yy_state_123)
+    NT_separated_nonempty_list_COMMA_parameter_ => Shift(yy_state_124)
+    NT_separated_list_COMMA_parameter_ => Shift(yy_state_125)
+    T_RPAREN => Reduce(0, NT_separated_list_COMMA_parameter_, yy_action_227)
+    _ => Error
+  }
+}
+
+// [231, separated_nonempty_list(COMMA,parameter) → parameter •, RPAREN]
+// [232, separated_nonempty_list(COMMA,parameter) → parameter • COMMA separated_nonempty_list(COMMA,parameter), RPAREN]
+
+///|
+fn yy_state_56(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_COMMA => Shift(yy_state_57)
+    T_RPAREN =>
+      Reduce(1, NT_separated_nonempty_list_COMMA_parameter_, yy_action_226)
+    _ => Error
+  }
+}
+
+// [146, simple_type → • simple_type QUESTION, RPAREN / COMMA / QUESTION]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, RPAREN / COMMA / QUESTION]
+// [148, simple_type → • LPAREN type_ RPAREN, RPAREN / COMMA / QUESTION]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, RPAREN / COMMA / QUESTION]
+// [150, simple_type → • AMPER qualified_uident_, RPAREN / COMMA / QUESTION]
+// [151, simple_type → • UNDERSCORE, RPAREN / COMMA / QUESTION]
+// [152, type_ → • simple_type, RPAREN / COMMA]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [168, parameter → • type_, RPAREN / COMMA]
+// [169, parameter → • post_label COLON type_, RPAREN / COMMA]
+// [170, parameter → • label QUESTION COLON type_, RPAREN / COMMA]
+// [185, qualified_uident_ → • UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
+// [189, label → • LIDENT, QUESTION]
+// [190, post_label → • POST_LABEL, COLON]
+// [231, separated_nonempty_list(COMMA,parameter) → • parameter, RPAREN]
+// [232, separated_nonempty_list(COMMA,parameter) → • parameter COMMA separated_nonempty_list(COMMA,parameter), RPAREN]
+// [232, separated_nonempty_list(COMMA,parameter) → parameter COMMA • separated_nonempty_list(COMMA,parameter), RPAREN]
+
+///|
+fn yy_state_57(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    NT_parameter => Shift(yy_state_56)
+    NT_separated_nonempty_list_COMMA_parameter_ => Shift(yy_state_58)
+    T_POST_LABEL => Shift(yy_state_59)
+    T_LIDENT => Shift(yy_state_60)
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    NT_label => Shift(yy_state_64)
+    T_ASYNC => Shift(yy_state_68)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_104)
+    NT_post_label => Shift(yy_state_120)
+    NT_type_ => Shift(yy_state_123)
+    _ => Error
+  }
+}
+
+// [232, separated_nonempty_list(COMMA,parameter) → parameter COMMA separated_nonempty_list(COMMA,parameter) •, RPAREN]
+
+///|
+fn yy_state_58(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(
+    3,
+    NT_separated_nonempty_list_COMMA_parameter_,
+    yy_action_225,
+  )
+}
+
+// [190, post_label → POST_LABEL •, COLON]
+
+///|
+fn yy_state_59(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_post_label, yy_action_224)
+}
+
+// [189, label → LIDENT •, QUESTION]
+
+///|
+fn yy_state_60(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_label, yy_action_223)
+}
+
+// [186, qualified_uident_ → PACKAGE_NAME • DOT_UIDENT, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / LBRACKET / RBRACKET / RBRACE]
+
+///|
+fn yy_state_61(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_DOT_UIDENT => Shift(yy_state_62)
+    _ => Error
+  }
+}
+
+// [186, qualified_uident_ → PACKAGE_NAME DOT_UIDENT •, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / LBRACKET / RBRACKET / RBRACE]
+
+///|
+fn yy_state_62(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(2, NT_qualified_uident_, yy_action_222)
+}
+
+// [185, qualified_uident_ → UIDENT •, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / LBRACKET / RBRACKET / RBRACE]
+
+///|
+fn yy_state_63(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_qualified_uident_, yy_action_221)
+}
+
+// [170, parameter → label • QUESTION COLON type_, RPAREN / COMMA]
+
+///|
+fn yy_state_64(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_QUESTION => Shift(yy_state_65)
+    _ => Error
+  }
+}
+
+// [170, parameter → label QUESTION • COLON type_, RPAREN / COMMA]
+
+///|
+fn yy_state_65(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_COLON => Shift(yy_state_66)
+    _ => Error
+  }
+}
+
+// [146, simple_type → • simple_type QUESTION, RPAREN / COMMA / QUESTION]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, RPAREN / COMMA / QUESTION]
+// [148, simple_type → • LPAREN type_ RPAREN, RPAREN / COMMA / QUESTION]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, RPAREN / COMMA / QUESTION]
+// [150, simple_type → • AMPER qualified_uident_, RPAREN / COMMA / QUESTION]
+// [151, simple_type → • UNDERSCORE, RPAREN / COMMA / QUESTION]
+// [152, type_ → • simple_type, RPAREN / COMMA]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [170, parameter → label QUESTION COLON • type_, RPAREN / COMMA]
+// [185, qualified_uident_ → • UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
+
+///|
+fn yy_state_66(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    NT_type_ => Shift(yy_state_67)
+    T_ASYNC => Shift(yy_state_68)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_104)
+    _ => Error
+  }
+}
+
+// [170, parameter → label QUESTION COLON type_ •, RPAREN / COMMA]
+
+///|
+fn yy_state_67(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(4, NT_parameter, yy_action_220)
+}
+
+// [153, type_ → ASYNC • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [154, type_ → ASYNC • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [157, type_ → ASYNC • LPAREN RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [159, type_ → ASYNC • LPAREN type_ RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+
+///|
+fn yy_state_68(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_LPAREN => Shift(yy_state_69)
+    _ => Error
+  }
+}
+
+// [146, simple_type → • simple_type QUESTION, RPAREN / COMMA / QUESTION]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, RPAREN / COMMA / QUESTION]
+// [148, simple_type → • LPAREN type_ RPAREN, RPAREN / COMMA / QUESTION]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, RPAREN / COMMA / QUESTION]
+// [150, simple_type → • AMPER qualified_uident_, RPAREN / COMMA / QUESTION]
+// [151, simple_type → • UNDERSCORE, RPAREN / COMMA / QUESTION]
+// [152, type_ → • simple_type, RPAREN / COMMA]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [153, type_ → ASYNC LPAREN • type_ COMMA RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [154, type_ → ASYNC LPAREN • type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [157, type_ → ASYNC LPAREN • RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [159, type_ → ASYNC LPAREN • type_ RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [185, qualified_uident_ → • UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
+
+///|
+fn yy_state_69(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    T_RPAREN => Shift(yy_state_70)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_104)
+    NT_type_ => Shift(yy_state_108)
+    _ => Error
+  }
+}
+
+// [157, type_ → ASYNC LPAREN RPAREN • THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+
+///|
+fn yy_state_70(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_THIN_ARROW => Shift(yy_state_71)
+    _ => Error
+  }
+}
+
+// [146, simple_type → • simple_type QUESTION, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+// [148, simple_type → • LPAREN type_ RPAREN, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+// [150, simple_type → • AMPER qualified_uident_, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+// [151, simple_type → • UNDERSCORE, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+// [152, type_ → • simple_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [157, type_ → ASYNC LPAREN RPAREN THIN_ARROW • return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [161, return_type → • type_, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [162, return_type → • simple_type RAISE, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [163, return_type → • simple_type RAISE error_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [164, return_type → • simple_type RAISE QUESTION, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [185, qualified_uident_ → • UIDENT, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / LBRACKET / RBRACKET / RBRACE]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / LBRACKET / RBRACKET / RBRACE]
+
+///|
+fn yy_state_71(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    NT_type_ => Shift(yy_state_72)
+    NT_return_type => Shift(yy_state_73)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_86)
+    _ => Error
+  }
+}
+
+// [161, return_type → type_ •, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+
+///|
+fn yy_state_72(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_return_type, yy_action_219)
+}
+
+// [157, type_ → ASYNC LPAREN RPAREN THIN_ARROW return_type •, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+
+///|
+fn yy_state_73(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(5, NT_type_, yy_action_218)
+}
+
+// [151, simple_type → UNDERSCORE •, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+
+///|
+fn yy_state_74(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_simple_type, yy_action_217)
+}
+
+// [150, simple_type → AMPER • qualified_uident_, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+// [185, qualified_uident_ → • UIDENT, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+
+///|
+fn yy_state_75(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    NT_qualified_uident_ => Shift(yy_state_76)
+    _ => Error
+  }
+}
+
+// [150, simple_type → AMPER qualified_uident_ •, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+
+///|
+fn yy_state_76(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(2, NT_simple_type, yy_action_216)
+}
+
+// [149, simple_type → qualified_uident_ • optional_type_arguments, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+// [166, optional_type_arguments → • LBRACKET separated_nonempty_list(COMMA,type_) RBRACKET, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+// [167, optional_type_arguments → •, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+
+///|
+fn yy_state_77(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_LBRACKET => Shift(yy_state_78)
+    NT_optional_type_arguments => Shift(yy_state_107)
+    T_EOF
+    | T_RAISE
+    | T_EQUAL
+    | T_RPAREN
+    | T_COMMA
+    | T_QUESTION
+    | T_SEMI
+    | T_RBRACKET
+    | T_RBRACE => Reduce(0, NT_optional_type_arguments, yy_action_215)
+    _ => Error
+  }
+}
+
+// [146, simple_type → • simple_type QUESTION, COMMA / QUESTION / RBRACKET]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, COMMA / QUESTION / RBRACKET]
+// [148, simple_type → • LPAREN type_ RPAREN, COMMA / QUESTION / RBRACKET]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, COMMA / QUESTION / RBRACKET]
+// [150, simple_type → • AMPER qualified_uident_, COMMA / QUESTION / RBRACKET]
+// [151, simple_type → • UNDERSCORE, COMMA / QUESTION / RBRACKET]
+// [152, type_ → • simple_type, COMMA / RBRACKET]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, COMMA / RBRACKET]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, COMMA / RBRACKET]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, COMMA / RBRACKET]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, COMMA / RBRACKET]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, COMMA / RBRACKET]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, COMMA / RBRACKET]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, COMMA / RBRACKET]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, COMMA / RBRACKET]
+// [166, optional_type_arguments → LBRACKET • separated_nonempty_list(COMMA,type_) RBRACKET, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+// [185, qualified_uident_ → • UIDENT, COMMA / QUESTION / LBRACKET / RBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, COMMA / QUESTION / LBRACKET / RBRACKET]
+// [227, separated_nonempty_list(COMMA,type_) → • type_, RBRACKET]
+// [228, separated_nonempty_list(COMMA,type_) → • type_ COMMA separated_nonempty_list(COMMA,type_), RBRACKET]
+
+///|
+fn yy_state_78(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    NT_type_ => Shift(yy_state_79)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_104)
+    NT_separated_nonempty_list_COMMA_type__ => Shift(yy_state_105)
+    _ => Error
+  }
+}
+
+// [227, separated_nonempty_list(COMMA,type_) → type_ •, RPAREN / RBRACKET]
+// [228, separated_nonempty_list(COMMA,type_) → type_ • COMMA separated_nonempty_list(COMMA,type_), RPAREN / RBRACKET]
+
+///|
+fn yy_state_79(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_COMMA => Shift(yy_state_80)
+    T_RPAREN | T_RBRACKET =>
+      Reduce(1, NT_separated_nonempty_list_COMMA_type__, yy_action_214)
+    _ => Error
+  }
+}
+
+// [146, simple_type → • simple_type QUESTION, RPAREN / COMMA / QUESTION / RBRACKET]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, RPAREN / COMMA / QUESTION / RBRACKET]
+// [148, simple_type → • LPAREN type_ RPAREN, RPAREN / COMMA / QUESTION / RBRACKET]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, RPAREN / COMMA / QUESTION / RBRACKET]
+// [150, simple_type → • AMPER qualified_uident_, RPAREN / COMMA / QUESTION / RBRACKET]
+// [151, simple_type → • UNDERSCORE, RPAREN / COMMA / QUESTION / RBRACKET]
+// [152, type_ → • simple_type, RPAREN / COMMA / RBRACKET]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA / RBRACKET]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA / RBRACKET]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA / RBRACKET]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA / RBRACKET]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA / RBRACKET]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA / RBRACKET]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA / RBRACKET]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA / RBRACKET]
+// [185, qualified_uident_ → • UIDENT, RPAREN / COMMA / QUESTION / LBRACKET / RBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, RPAREN / COMMA / QUESTION / LBRACKET / RBRACKET]
+// [227, separated_nonempty_list(COMMA,type_) → • type_, RPAREN / RBRACKET]
+// [228, separated_nonempty_list(COMMA,type_) → • type_ COMMA separated_nonempty_list(COMMA,type_), RPAREN / RBRACKET]
+// [228, separated_nonempty_list(COMMA,type_) → type_ COMMA • separated_nonempty_list(COMMA,type_), RPAREN / RBRACKET]
+
+///|
+fn yy_state_80(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    NT_type_ => Shift(yy_state_79)
+    NT_separated_nonempty_list_COMMA_type__ => Shift(yy_state_81)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_104)
+    _ => Error
+  }
+}
+
+// [228, separated_nonempty_list(COMMA,type_) → type_ COMMA separated_nonempty_list(COMMA,type_) •, RPAREN / RBRACKET]
+
+///|
+fn yy_state_81(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(3, NT_separated_nonempty_list_COMMA_type__, yy_action_213)
+}
+
+// [146, simple_type → • simple_type QUESTION, RPAREN / COMMA / QUESTION]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, RPAREN / COMMA / QUESTION]
+// [147, simple_type → LPAREN • type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+// [148, simple_type → • LPAREN type_ RPAREN, RPAREN / COMMA / QUESTION]
+// [148, simple_type → LPAREN • type_ RPAREN, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, RPAREN / COMMA / QUESTION]
+// [150, simple_type → • AMPER qualified_uident_, RPAREN / COMMA / QUESTION]
+// [151, simple_type → • UNDERSCORE, RPAREN / COMMA / QUESTION]
+// [152, type_ → • simple_type, RPAREN / COMMA]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [155, type_ → LPAREN • type_ COMMA RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [156, type_ → LPAREN • type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [158, type_ → LPAREN • RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [160, type_ → LPAREN • type_ RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [185, qualified_uident_ → • UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
+
+///|
+fn yy_state_82(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    T_RPAREN => Shift(yy_state_83)
+    NT_type_ => Shift(yy_state_92)
+    NT_simple_type => Shift(yy_state_104)
+    _ => Error
+  }
+}
+
+// [158, type_ → LPAREN RPAREN • THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+
+///|
+fn yy_state_83(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_THIN_ARROW => Shift(yy_state_84)
+    _ => Error
+  }
+}
+
+// [146, simple_type → • simple_type QUESTION, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+// [148, simple_type → • LPAREN type_ RPAREN, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+// [150, simple_type → • AMPER qualified_uident_, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+// [151, simple_type → • UNDERSCORE, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+// [152, type_ → • simple_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [158, type_ → LPAREN RPAREN THIN_ARROW • return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [161, return_type → • type_, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [162, return_type → • simple_type RAISE, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [163, return_type → • simple_type RAISE error_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [164, return_type → • simple_type RAISE QUESTION, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [185, qualified_uident_ → • UIDENT, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / LBRACKET / RBRACKET / RBRACE]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / LBRACKET / RBRACKET / RBRACE]
+
+///|
+fn yy_state_84(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    NT_type_ => Shift(yy_state_72)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_return_type => Shift(yy_state_85)
+    NT_simple_type => Shift(yy_state_86)
+    _ => Error
+  }
+}
+
+// [158, type_ → LPAREN RPAREN THIN_ARROW return_type •, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+
+///|
+fn yy_state_85(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(4, NT_type_, yy_action_212)
+}
+
+// [146, simple_type → simple_type • QUESTION, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+// [152, type_ → simple_type •, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [162, return_type → simple_type • RAISE, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [163, return_type → simple_type • RAISE error_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [164, return_type → simple_type • RAISE QUESTION, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+
+///|
+fn yy_state_86(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_RAISE => Shift(yy_state_87)
+    T_QUESTION => Shift(yy_state_91)
+    T_EOF | T_EQUAL | T_RPAREN | T_COMMA | T_SEMI | T_RBRACKET | T_RBRACE =>
+      Reduce(1, NT_type_, yy_action_211)
+    _ => Error
+  }
+}
+
+// [162, return_type → simple_type RAISE •, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [163, return_type → simple_type RAISE • error_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [164, return_type → simple_type RAISE • QUESTION, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [165, error_type → • qualified_uident_, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [185, qualified_uident_ → • UIDENT, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+
+///|
+fn yy_state_87(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    NT_qualified_uident_ => Shift(yy_state_88)
+    T_QUESTION => Shift(yy_state_89)
+    NT_error_type => Shift(yy_state_90)
+    T_EOF | T_EQUAL | T_RPAREN | T_COMMA | T_SEMI | T_RBRACKET | T_RBRACE =>
+      Reduce(2, NT_return_type, yy_action_210)
+    _ => Error
+  }
+}
+
+// [165, error_type → qualified_uident_ •, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+
+///|
+fn yy_state_88(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_error_type, yy_action_209)
+}
+
+// [164, return_type → simple_type RAISE QUESTION •, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+
+///|
+fn yy_state_89(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(3, NT_return_type, yy_action_208)
+}
+
+// [163, return_type → simple_type RAISE error_type •, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+
+///|
+fn yy_state_90(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(3, NT_return_type, yy_action_207)
+}
+
+// [146, simple_type → simple_type QUESTION •, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+
+///|
+fn yy_state_91(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(2, NT_simple_type, yy_action_206)
+}
+
+// [147, simple_type → LPAREN type_ • COMMA separated_nonempty_list(COMMA,type_) RPAREN, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+// [148, simple_type → LPAREN type_ • RPAREN, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+// [155, type_ → LPAREN type_ • COMMA RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [156, type_ → LPAREN type_ • COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [160, type_ → LPAREN type_ • RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+
+///|
+fn yy_state_92(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_RPAREN => Shift(yy_state_93)
+    T_COMMA => Shift(yy_state_96)
+    _ => Error
+  }
+}
+
+// [148, simple_type → LPAREN type_ RPAREN •, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+// [160, type_ → LPAREN type_ RPAREN • THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+
+///|
+fn yy_state_93(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_THIN_ARROW => Shift(yy_state_94)
+    T_EOF
+    | T_RAISE
+    | T_EQUAL
+    | T_RPAREN
+    | T_COMMA
+    | T_QUESTION
+    | T_SEMI
+    | T_RBRACKET
+    | T_RBRACE => Reduce(3, NT_simple_type, yy_action_205)
+    _ => Error
+  }
+}
+
+// [146, simple_type → • simple_type QUESTION, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+// [148, simple_type → • LPAREN type_ RPAREN, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+// [150, simple_type → • AMPER qualified_uident_, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+// [151, simple_type → • UNDERSCORE, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+// [152, type_ → • simple_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [160, type_ → LPAREN type_ RPAREN THIN_ARROW • return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [161, return_type → • type_, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [162, return_type → • simple_type RAISE, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [163, return_type → • simple_type RAISE error_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [164, return_type → • simple_type RAISE QUESTION, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [185, qualified_uident_ → • UIDENT, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / LBRACKET / RBRACKET / RBRACE]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / LBRACKET / RBRACKET / RBRACE]
+
+///|
+fn yy_state_94(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    NT_type_ => Shift(yy_state_72)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_86)
+    NT_return_type => Shift(yy_state_95)
+    _ => Error
+  }
+}
+
+// [160, type_ → LPAREN type_ RPAREN THIN_ARROW return_type •, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+
+///|
+fn yy_state_95(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(5, NT_type_, yy_action_204)
+}
+
+// [146, simple_type → • simple_type QUESTION, RPAREN / COMMA / QUESTION]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, RPAREN / COMMA / QUESTION]
+// [147, simple_type → LPAREN type_ COMMA • separated_nonempty_list(COMMA,type_) RPAREN, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+// [148, simple_type → • LPAREN type_ RPAREN, RPAREN / COMMA / QUESTION]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, RPAREN / COMMA / QUESTION]
+// [150, simple_type → • AMPER qualified_uident_, RPAREN / COMMA / QUESTION]
+// [151, simple_type → • UNDERSCORE, RPAREN / COMMA / QUESTION]
+// [152, type_ → • simple_type, RPAREN / COMMA]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [155, type_ → LPAREN type_ COMMA • RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [156, type_ → LPAREN type_ COMMA • separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [185, qualified_uident_ → • UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
+// [227, separated_nonempty_list(COMMA,type_) → • type_, RPAREN]
+// [228, separated_nonempty_list(COMMA,type_) → • type_ COMMA separated_nonempty_list(COMMA,type_), RPAREN]
+
+///|
+fn yy_state_96(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    NT_type_ => Shift(yy_state_79)
+    T_LPAREN => Shift(yy_state_82)
+    T_RPAREN => Shift(yy_state_97)
+    NT_separated_nonempty_list_COMMA_type__ => Shift(yy_state_100)
+    NT_simple_type => Shift(yy_state_104)
+    _ => Error
+  }
+}
+
+// [155, type_ → LPAREN type_ COMMA RPAREN • THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+
+///|
+fn yy_state_97(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_THIN_ARROW => Shift(yy_state_98)
+    _ => Error
+  }
+}
+
+// [146, simple_type → • simple_type QUESTION, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+// [148, simple_type → • LPAREN type_ RPAREN, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+// [150, simple_type → • AMPER qualified_uident_, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+// [151, simple_type → • UNDERSCORE, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+// [152, type_ → • simple_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [155, type_ → LPAREN type_ COMMA RPAREN THIN_ARROW • return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [161, return_type → • type_, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [162, return_type → • simple_type RAISE, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [163, return_type → • simple_type RAISE error_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [164, return_type → • simple_type RAISE QUESTION, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [185, qualified_uident_ → • UIDENT, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / LBRACKET / RBRACKET / RBRACE]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / LBRACKET / RBRACKET / RBRACE]
+
+///|
+fn yy_state_98(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    NT_type_ => Shift(yy_state_72)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_86)
+    NT_return_type => Shift(yy_state_99)
+    _ => Error
+  }
+}
+
+// [155, type_ → LPAREN type_ COMMA RPAREN THIN_ARROW return_type •, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+
+///|
+fn yy_state_99(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(6, NT_type_, yy_action_203)
+}
+
+// [147, simple_type → LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) • RPAREN, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+// [156, type_ → LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) • RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+
+///|
+fn yy_state_100(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_RPAREN => Shift(yy_state_101)
+    _ => Error
+  }
+}
+
+// [147, simple_type → LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN •, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+// [156, type_ → LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN • THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+
+///|
+fn yy_state_101(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_THIN_ARROW => Shift(yy_state_102)
+    T_EOF
+    | T_RAISE
+    | T_EQUAL
+    | T_RPAREN
+    | T_COMMA
+    | T_QUESTION
+    | T_SEMI
+    | T_RBRACKET
+    | T_RBRACE => Reduce(5, NT_simple_type, yy_action_202)
+    _ => Error
+  }
+}
+
+// [146, simple_type → • simple_type QUESTION, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+// [148, simple_type → • LPAREN type_ RPAREN, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+// [150, simple_type → • AMPER qualified_uident_, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+// [151, simple_type → • UNDERSCORE, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+// [152, type_ → • simple_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [156, type_ → LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW • return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [161, return_type → • type_, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [162, return_type → • simple_type RAISE, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [163, return_type → • simple_type RAISE error_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [164, return_type → • simple_type RAISE QUESTION, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [185, qualified_uident_ → • UIDENT, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / LBRACKET / RBRACKET / RBRACE]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / LBRACKET / RBRACKET / RBRACE]
+
+///|
+fn yy_state_102(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    NT_type_ => Shift(yy_state_72)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_86)
+    NT_return_type => Shift(yy_state_103)
+    _ => Error
+  }
+}
+
+// [156, type_ → LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type •, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+
+///|
+fn yy_state_103(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(7, NT_type_, yy_action_201)
+}
+
+// [146, simple_type → simple_type • QUESTION, EOF / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+// [152, type_ → simple_type •, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+
+///|
+fn yy_state_104(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_QUESTION => Shift(yy_state_91)
+    T_EOF | T_EQUAL | T_RPAREN | T_COMMA | T_SEMI | T_RBRACKET | T_RBRACE =>
+      Reduce(1, NT_type_, yy_action_211)
+    _ => Error
+  }
+}
+
+// [166, optional_type_arguments → LBRACKET separated_nonempty_list(COMMA,type_) • RBRACKET, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+
+///|
+fn yy_state_105(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_RBRACKET => Shift(yy_state_106)
+    _ => Error
+  }
+}
+
+// [166, optional_type_arguments → LBRACKET separated_nonempty_list(COMMA,type_) RBRACKET •, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+
+///|
+fn yy_state_106(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(3, NT_optional_type_arguments, yy_action_199)
+}
+
+// [149, simple_type → qualified_uident_ optional_type_arguments •, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+
+///|
+fn yy_state_107(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(2, NT_simple_type, yy_action_198)
+}
+
+// [153, type_ → ASYNC LPAREN type_ • COMMA RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [154, type_ → ASYNC LPAREN type_ • COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [159, type_ → ASYNC LPAREN type_ • RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+
+///|
+fn yy_state_108(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_RPAREN => Shift(yy_state_109)
+    T_COMMA => Shift(yy_state_112)
+    _ => Error
+  }
+}
+
+// [159, type_ → ASYNC LPAREN type_ RPAREN • THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+
+///|
+fn yy_state_109(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_THIN_ARROW => Shift(yy_state_110)
+    _ => Error
+  }
+}
+
+// [146, simple_type → • simple_type QUESTION, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+// [148, simple_type → • LPAREN type_ RPAREN, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+// [150, simple_type → • AMPER qualified_uident_, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+// [151, simple_type → • UNDERSCORE, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+// [152, type_ → • simple_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [159, type_ → ASYNC LPAREN type_ RPAREN THIN_ARROW • return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [161, return_type → • type_, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [162, return_type → • simple_type RAISE, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [163, return_type → • simple_type RAISE error_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [164, return_type → • simple_type RAISE QUESTION, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [185, qualified_uident_ → • UIDENT, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / LBRACKET / RBRACKET / RBRACE]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / LBRACKET / RBRACKET / RBRACE]
+
+///|
+fn yy_state_110(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    NT_type_ => Shift(yy_state_72)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_86)
+    NT_return_type => Shift(yy_state_111)
+    _ => Error
+  }
+}
+
+// [159, type_ → ASYNC LPAREN type_ RPAREN THIN_ARROW return_type •, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+
+///|
+fn yy_state_111(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(6, NT_type_, yy_action_197)
+}
+
+// [146, simple_type → • simple_type QUESTION, RPAREN / COMMA / QUESTION]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, RPAREN / COMMA / QUESTION]
+// [148, simple_type → • LPAREN type_ RPAREN, RPAREN / COMMA / QUESTION]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, RPAREN / COMMA / QUESTION]
+// [150, simple_type → • AMPER qualified_uident_, RPAREN / COMMA / QUESTION]
+// [151, simple_type → • UNDERSCORE, RPAREN / COMMA / QUESTION]
+// [152, type_ → • simple_type, RPAREN / COMMA]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [153, type_ → ASYNC LPAREN type_ COMMA • RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [154, type_ → ASYNC LPAREN type_ COMMA • separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [185, qualified_uident_ → • UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
+// [227, separated_nonempty_list(COMMA,type_) → • type_, RPAREN]
+// [228, separated_nonempty_list(COMMA,type_) → • type_ COMMA separated_nonempty_list(COMMA,type_), RPAREN]
+
+///|
+fn yy_state_112(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    NT_type_ => Shift(yy_state_79)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_104)
+    NT_separated_nonempty_list_COMMA_type__ => Shift(yy_state_113)
+    T_RPAREN => Shift(yy_state_117)
+    _ => Error
+  }
+}
+
+// [154, type_ → ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) • RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+
+///|
+fn yy_state_113(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_RPAREN => Shift(yy_state_114)
+    _ => Error
+  }
+}
+
+// [154, type_ → ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN • THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+
+///|
+fn yy_state_114(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_THIN_ARROW => Shift(yy_state_115)
+    _ => Error
+  }
+}
+
+// [146, simple_type → • simple_type QUESTION, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+// [148, simple_type → • LPAREN type_ RPAREN, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+// [150, simple_type → • AMPER qualified_uident_, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+// [151, simple_type → • UNDERSCORE, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+// [152, type_ → • simple_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [154, type_ → ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW • return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [161, return_type → • type_, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [162, return_type → • simple_type RAISE, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [163, return_type → • simple_type RAISE error_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [164, return_type → • simple_type RAISE QUESTION, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [185, qualified_uident_ → • UIDENT, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / LBRACKET / RBRACKET / RBRACE]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / LBRACKET / RBRACKET / RBRACE]
+
+///|
+fn yy_state_115(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    NT_type_ => Shift(yy_state_72)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_86)
+    NT_return_type => Shift(yy_state_116)
+    _ => Error
+  }
+}
+
+// [154, type_ → ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type •, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+
+///|
+fn yy_state_116(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(8, NT_type_, yy_action_195)
+}
+
+// [153, type_ → ASYNC LPAREN type_ COMMA RPAREN • THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+
+///|
+fn yy_state_117(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_THIN_ARROW => Shift(yy_state_118)
+    _ => Error
+  }
+}
+
+// [146, simple_type → • simple_type QUESTION, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+// [148, simple_type → • LPAREN type_ RPAREN, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+// [150, simple_type → • AMPER qualified_uident_, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+// [151, simple_type → • UNDERSCORE, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE]
+// [152, type_ → • simple_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [153, type_ → ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW • return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [161, return_type → • type_, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [162, return_type → • simple_type RAISE, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [163, return_type → • simple_type RAISE error_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [164, return_type → • simple_type RAISE QUESTION, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+// [185, qualified_uident_ → • UIDENT, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / LBRACKET / RBRACKET / RBRACE]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / LBRACKET / RBRACKET / RBRACE]
+
+///|
+fn yy_state_118(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    NT_type_ => Shift(yy_state_72)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_86)
+    NT_return_type => Shift(yy_state_119)
+    _ => Error
+  }
+}
+
+// [153, type_ → ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type •, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE]
+
+///|
+fn yy_state_119(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(7, NT_type_, yy_action_193)
+}
+
+// [169, parameter → post_label • COLON type_, RPAREN / COMMA]
+
+///|
+fn yy_state_120(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_COLON => Shift(yy_state_121)
+    _ => Error
+  }
+}
+
+// [146, simple_type → • simple_type QUESTION, RPAREN / COMMA / QUESTION]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, RPAREN / COMMA / QUESTION]
+// [148, simple_type → • LPAREN type_ RPAREN, RPAREN / COMMA / QUESTION]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, RPAREN / COMMA / QUESTION]
+// [150, simple_type → • AMPER qualified_uident_, RPAREN / COMMA / QUESTION]
+// [151, simple_type → • UNDERSCORE, RPAREN / COMMA / QUESTION]
+// [152, type_ → • simple_type, RPAREN / COMMA]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [169, parameter → post_label COLON • type_, RPAREN / COMMA]
+// [185, qualified_uident_ → • UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
+
+///|
+fn yy_state_121(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_104)
+    NT_type_ => Shift(yy_state_122)
+    _ => Error
+  }
+}
+
+// [169, parameter → post_label COLON type_ •, RPAREN / COMMA]
+
+///|
+fn yy_state_122(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(3, NT_parameter, yy_action_192)
+}
+
+// [168, parameter → type_ •, RPAREN / COMMA]
+
+///|
+fn yy_state_123(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_parameter, yy_action_191)
+}
+
+// [198, separated_list(COMMA,parameter) → separated_nonempty_list(COMMA,parameter) •, RPAREN]
+
+///|
+fn yy_state_124(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_separated_list_COMMA_parameter_, yy_action_190)
+}
+
+// [37, trait_method_sig → nonempty_list(attribute) lident LPAREN separated_list(COMMA,parameter) • RPAREN THIN_ARROW return_type boption(eq_underscore), SEMI / RBRACE]
+
+///|
+fn yy_state_125(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_RPAREN => Shift(yy_state_126)
+    _ => Error
+  }
+}
+
+// [37, trait_method_sig → nonempty_list(attribute) lident LPAREN separated_list(COMMA,parameter) RPAREN • THIN_ARROW return_type boption(eq_underscore), SEMI / RBRACE]
+
+///|
+fn yy_state_126(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_THIN_ARROW => Shift(yy_state_127)
+    _ => Error
+  }
+}
+
+// [37, trait_method_sig → nonempty_list(attribute) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW • return_type boption(eq_underscore), SEMI / RBRACE]
+// [146, simple_type → • simple_type QUESTION, RAISE / EQUAL / QUESTION / SEMI / RBRACE]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, RAISE / EQUAL / QUESTION / SEMI / RBRACE]
+// [148, simple_type → • LPAREN type_ RPAREN, RAISE / EQUAL / QUESTION / SEMI / RBRACE]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, RAISE / EQUAL / QUESTION / SEMI / RBRACE]
+// [150, simple_type → • AMPER qualified_uident_, RAISE / EQUAL / QUESTION / SEMI / RBRACE]
+// [151, simple_type → • UNDERSCORE, RAISE / EQUAL / QUESTION / SEMI / RBRACE]
+// [152, type_ → • simple_type, EQUAL / SEMI / RBRACE]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EQUAL / SEMI / RBRACE]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EQUAL / SEMI / RBRACE]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EQUAL / SEMI / RBRACE]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EQUAL / SEMI / RBRACE]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EQUAL / SEMI / RBRACE]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, EQUAL / SEMI / RBRACE]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EQUAL / SEMI / RBRACE]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EQUAL / SEMI / RBRACE]
+// [161, return_type → • type_, EQUAL / SEMI / RBRACE]
+// [162, return_type → • simple_type RAISE, EQUAL / SEMI / RBRACE]
+// [163, return_type → • simple_type RAISE error_type, EQUAL / SEMI / RBRACE]
+// [164, return_type → • simple_type RAISE QUESTION, EQUAL / SEMI / RBRACE]
+// [185, qualified_uident_ → • UIDENT, RAISE / EQUAL / QUESTION / SEMI / LBRACKET / RBRACE]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, RAISE / EQUAL / QUESTION / SEMI / LBRACKET / RBRACE]
+
+///|
+fn yy_state_127(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    NT_type_ => Shift(yy_state_72)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_86)
+    NT_return_type => Shift(yy_state_128)
+    _ => Error
+  }
+}
+
+// [37, trait_method_sig → nonempty_list(attribute) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type • boption(eq_underscore), SEMI / RBRACE]
+// [199, boption(eq_underscore) → •, SEMI / RBRACE]
+// [200, boption(eq_underscore) → • EQUAL UNDERSCORE, SEMI / RBRACE]
+
+///|
+fn yy_state_128(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_EQUAL => Shift(yy_state_129)
+    NT_boption_eq_underscore_ => Shift(yy_state_131)
+    T_SEMI | T_RBRACE => Reduce(0, NT_boption_eq_underscore_, yy_action_189)
+    _ => Error
+  }
+}
+
+// [200, boption(eq_underscore) → EQUAL • UNDERSCORE, SEMI / RBRACE]
+
+///|
+fn yy_state_129(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_UNDERSCORE => Shift(yy_state_130)
+    _ => Error
+  }
+}
+
+// [200, boption(eq_underscore) → EQUAL UNDERSCORE •, SEMI / RBRACE]
+
+///|
+fn yy_state_130(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(2, NT_boption_eq_underscore_, yy_action_187)
+}
+
+// [37, trait_method_sig → nonempty_list(attribute) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type boption(eq_underscore) •, SEMI / RBRACE]
+
+///|
+fn yy_state_131(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(8, NT_trait_method_sig, yy_action_186)
+}
+
+// [36, trait_method_sig → lident • LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type boption(eq_underscore), SEMI / RBRACE]
+
+///|
+fn yy_state_132(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_LPAREN => Shift(yy_state_133)
+    _ => Error
+  }
+}
+
+// [36, trait_method_sig → lident LPAREN • separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type boption(eq_underscore), SEMI / RBRACE]
+// [146, simple_type → • simple_type QUESTION, RPAREN / COMMA / QUESTION]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, RPAREN / COMMA / QUESTION]
+// [148, simple_type → • LPAREN type_ RPAREN, RPAREN / COMMA / QUESTION]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, RPAREN / COMMA / QUESTION]
+// [150, simple_type → • AMPER qualified_uident_, RPAREN / COMMA / QUESTION]
+// [151, simple_type → • UNDERSCORE, RPAREN / COMMA / QUESTION]
+// [152, type_ → • simple_type, RPAREN / COMMA]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [168, parameter → • type_, RPAREN / COMMA]
+// [169, parameter → • post_label COLON type_, RPAREN / COMMA]
+// [170, parameter → • label QUESTION COLON type_, RPAREN / COMMA]
+// [185, qualified_uident_ → • UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
+// [189, label → • LIDENT, QUESTION]
+// [190, post_label → • POST_LABEL, COLON]
+// [197, separated_list(COMMA,parameter) → •, RPAREN]
+// [198, separated_list(COMMA,parameter) → • separated_nonempty_list(COMMA,parameter), RPAREN]
+// [231, separated_nonempty_list(COMMA,parameter) → • parameter, RPAREN]
+// [232, separated_nonempty_list(COMMA,parameter) → • parameter COMMA separated_nonempty_list(COMMA,parameter), RPAREN]
+
+///|
+fn yy_state_133(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    NT_parameter => Shift(yy_state_56)
+    T_POST_LABEL => Shift(yy_state_59)
+    T_LIDENT => Shift(yy_state_60)
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    NT_label => Shift(yy_state_64)
+    T_ASYNC => Shift(yy_state_68)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_104)
+    NT_post_label => Shift(yy_state_120)
+    NT_type_ => Shift(yy_state_123)
+    NT_separated_nonempty_list_COMMA_parameter_ => Shift(yy_state_124)
+    NT_separated_list_COMMA_parameter_ => Shift(yy_state_134)
+    T_RPAREN => Reduce(0, NT_separated_list_COMMA_parameter_, yy_action_227)
+    _ => Error
+  }
+}
+
+// [36, trait_method_sig → lident LPAREN separated_list(COMMA,parameter) • RPAREN THIN_ARROW return_type boption(eq_underscore), SEMI / RBRACE]
+
+///|
+fn yy_state_134(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_RPAREN => Shift(yy_state_135)
+    _ => Error
+  }
+}
+
+// [36, trait_method_sig → lident LPAREN separated_list(COMMA,parameter) RPAREN • THIN_ARROW return_type boption(eq_underscore), SEMI / RBRACE]
+
+///|
+fn yy_state_135(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_THIN_ARROW => Shift(yy_state_136)
+    _ => Error
+  }
+}
+
+// [36, trait_method_sig → lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW • return_type boption(eq_underscore), SEMI / RBRACE]
+// [146, simple_type → • simple_type QUESTION, RAISE / EQUAL / QUESTION / SEMI / RBRACE]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, RAISE / EQUAL / QUESTION / SEMI / RBRACE]
+// [148, simple_type → • LPAREN type_ RPAREN, RAISE / EQUAL / QUESTION / SEMI / RBRACE]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, RAISE / EQUAL / QUESTION / SEMI / RBRACE]
+// [150, simple_type → • AMPER qualified_uident_, RAISE / EQUAL / QUESTION / SEMI / RBRACE]
+// [151, simple_type → • UNDERSCORE, RAISE / EQUAL / QUESTION / SEMI / RBRACE]
+// [152, type_ → • simple_type, EQUAL / SEMI / RBRACE]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EQUAL / SEMI / RBRACE]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EQUAL / SEMI / RBRACE]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EQUAL / SEMI / RBRACE]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EQUAL / SEMI / RBRACE]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EQUAL / SEMI / RBRACE]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, EQUAL / SEMI / RBRACE]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EQUAL / SEMI / RBRACE]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EQUAL / SEMI / RBRACE]
+// [161, return_type → • type_, EQUAL / SEMI / RBRACE]
+// [162, return_type → • simple_type RAISE, EQUAL / SEMI / RBRACE]
+// [163, return_type → • simple_type RAISE error_type, EQUAL / SEMI / RBRACE]
+// [164, return_type → • simple_type RAISE QUESTION, EQUAL / SEMI / RBRACE]
+// [185, qualified_uident_ → • UIDENT, RAISE / EQUAL / QUESTION / SEMI / LBRACKET / RBRACE]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, RAISE / EQUAL / QUESTION / SEMI / LBRACKET / RBRACE]
+
+///|
+fn yy_state_136(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    NT_type_ => Shift(yy_state_72)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_86)
+    NT_return_type => Shift(yy_state_137)
+    _ => Error
+  }
+}
+
+// [36, trait_method_sig → lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type • boption(eq_underscore), SEMI / RBRACE]
+// [199, boption(eq_underscore) → •, SEMI / RBRACE]
+// [200, boption(eq_underscore) → • EQUAL UNDERSCORE, SEMI / RBRACE]
+
+///|
+fn yy_state_137(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_EQUAL => Shift(yy_state_129)
+    NT_boption_eq_underscore_ => Shift(yy_state_138)
+    T_SEMI | T_RBRACE => Reduce(0, NT_boption_eq_underscore_, yy_action_189)
+    _ => Error
+  }
+}
+
+// [36, trait_method_sig → lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type boption(eq_underscore) •, SEMI / RBRACE]
+
+///|
+fn yy_state_138(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(7, NT_trait_method_sig, yy_action_185)
+}
+
+// [86, trait_sig → TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) • RBRACE, EOF / SEMI]
+
+///|
+fn yy_state_139(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_RBRACE => Shift(yy_state_140)
+    _ => Error
+  }
+}
+
+// [86, trait_sig → TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE •, EOF / SEMI]
+
+///|
+fn yy_state_140(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(6, NT_trait_sig, yy_action_184)
+}
+
+// [74, impl_sig → IMPL • type_params_with_constraints qualified_uident FOR type_, EOF / SEMI]
+// [80, impl_sig → IMPL • qualified_uident FOR type_, EOF / SEMI]
+// [138, type_params_with_constraints → • LBRACKET separated_list(COMMA,type_param_with_constraints) RBRACKET, UIDENT / PACKAGE_NAME]
+// [183, qualified_uident → • UIDENT, FOR]
+// [184, qualified_uident → • PACKAGE_NAME DOT_UIDENT, FOR]
+
+///|
+fn yy_state_141(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_PACKAGE_NAME => Shift(yy_state_45)
+    T_UIDENT => Shift(yy_state_47)
+    T_LBRACKET => Shift(yy_state_142)
+    NT_qualified_uident => Shift(yy_state_156)
+    NT_type_params_with_constraints => Shift(yy_state_159)
+    _ => Error
+  }
+}
+
+// [136, type_param_with_constraints → • uident, COMMA / RBRACKET]
+// [137, type_param_with_constraints → • uident COLON separated_nonempty_list(PLUS,type_constraint), COMMA / RBRACKET]
+// [138, type_params_with_constraints → LBRACKET • separated_list(COMMA,type_param_with_constraints) RBRACKET, LIDENT / UIDENT / AMPER / PACKAGE_NAME]
+// [187, uident → • UIDENT, COMMA / COLON / RBRACKET]
+// [223, separated_list(COMMA,type_param_with_constraints) → •, RBRACKET]
+// [224, separated_list(COMMA,type_param_with_constraints) → • separated_nonempty_list(COMMA,type_param_with_constraints), RBRACKET]
+// [235, separated_nonempty_list(COMMA,type_param_with_constraints) → • type_param_with_constraints, RBRACKET]
+// [236, separated_nonempty_list(COMMA,type_param_with_constraints) → • type_param_with_constraints COMMA separated_nonempty_list(COMMA,type_param_with_constraints), RBRACKET]
+
+///|
+fn yy_state_142(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_UIDENT => Shift(yy_state_23)
+    NT_type_param_with_constraints => Shift(yy_state_143)
+    NT_uident => Shift(yy_state_146)
+    NT_separated_nonempty_list_COMMA_type_param_with_constraints_ =>
+      Shift(yy_state_153)
+    NT_separated_list_COMMA_type_param_with_constraints_ => Shift(yy_state_154)
+    T_RBRACKET =>
+      Reduce(
+        0,
+        NT_separated_list_COMMA_type_param_with_constraints_,
+        yy_action_183,
+      )
+    _ => Error
+  }
+}
+
+// [235, separated_nonempty_list(COMMA,type_param_with_constraints) → type_param_with_constraints •, RBRACKET]
+// [236, separated_nonempty_list(COMMA,type_param_with_constraints) → type_param_with_constraints • COMMA separated_nonempty_list(COMMA,type_param_with_constraints), RBRACKET]
+
+///|
+fn yy_state_143(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_COMMA => Shift(yy_state_144)
+    T_RBRACKET =>
+      Reduce(
+        1,
+        NT_separated_nonempty_list_COMMA_type_param_with_constraints_,
+        yy_action_182,
+      )
+    _ => Error
+  }
+}
+
+// [136, type_param_with_constraints → • uident, COMMA / RBRACKET]
+// [137, type_param_with_constraints → • uident COLON separated_nonempty_list(PLUS,type_constraint), COMMA / RBRACKET]
+// [187, uident → • UIDENT, COMMA / COLON / RBRACKET]
+// [235, separated_nonempty_list(COMMA,type_param_with_constraints) → • type_param_with_constraints, RBRACKET]
+// [236, separated_nonempty_list(COMMA,type_param_with_constraints) → • type_param_with_constraints COMMA separated_nonempty_list(COMMA,type_param_with_constraints), RBRACKET]
+// [236, separated_nonempty_list(COMMA,type_param_with_constraints) → type_param_with_constraints COMMA • separated_nonempty_list(COMMA,type_param_with_constraints), RBRACKET]
+
+///|
+fn yy_state_144(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_UIDENT => Shift(yy_state_23)
+    NT_type_param_with_constraints => Shift(yy_state_143)
+    NT_separated_nonempty_list_COMMA_type_param_with_constraints_ =>
+      Shift(yy_state_145)
+    NT_uident => Shift(yy_state_146)
+    _ => Error
+  }
+}
+
+// [236, separated_nonempty_list(COMMA,type_param_with_constraints) → type_param_with_constraints COMMA separated_nonempty_list(COMMA,type_param_with_constraints) •, RBRACKET]
+
+///|
+fn yy_state_145(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(
+    3,
+    NT_separated_nonempty_list_COMMA_type_param_with_constraints_,
+    yy_action_181,
+  )
+}
+
+// [136, type_param_with_constraints → uident •, COMMA / RBRACKET]
+// [137, type_param_with_constraints → uident • COLON separated_nonempty_list(PLUS,type_constraint), COMMA / RBRACKET]
+
+///|
+fn yy_state_146(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_COLON => Shift(yy_state_147)
+    T_COMMA | T_RBRACKET =>
+      Reduce(1, NT_type_param_with_constraints, yy_action_180)
+    _ => Error
+  }
+}
+
+// [137, type_param_with_constraints → uident COLON • separated_nonempty_list(PLUS,type_constraint), COMMA / RBRACKET]
+// [144, type_constraint → • qualified_uident, COMMA / PLUS / RBRACKET]
+// [183, qualified_uident → • UIDENT, COMMA / PLUS / RBRACKET]
+// [184, qualified_uident → • PACKAGE_NAME DOT_UIDENT, COMMA / PLUS / RBRACKET]
+// [221, separated_nonempty_list(PLUS,type_constraint) → • type_constraint, COMMA / RBRACKET]
+// [222, separated_nonempty_list(PLUS,type_constraint) → • type_constraint PLUS separated_nonempty_list(PLUS,type_constraint), COMMA / RBRACKET]
+
+///|
+fn yy_state_147(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_PACKAGE_NAME => Shift(yy_state_45)
+    T_UIDENT => Shift(yy_state_47)
+    NT_type_constraint => Shift(yy_state_148)
+    NT_qualified_uident => Shift(yy_state_151)
+    NT_separated_nonempty_list_PLUS_type_constraint_ => Shift(yy_state_152)
+    _ => Error
+  }
+}
+
+// [221, separated_nonempty_list(PLUS,type_constraint) → type_constraint •, COMMA / RBRACKET]
+// [222, separated_nonempty_list(PLUS,type_constraint) → type_constraint • PLUS separated_nonempty_list(PLUS,type_constraint), COMMA / RBRACKET]
+
+///|
+fn yy_state_148(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_PLUS => Shift(yy_state_149)
+    T_COMMA | T_RBRACKET =>
+      Reduce(1, NT_separated_nonempty_list_PLUS_type_constraint_, yy_action_179)
+    _ => Error
+  }
+}
+
+// [144, type_constraint → • qualified_uident, COMMA / PLUS / RBRACKET]
+// [183, qualified_uident → • UIDENT, COMMA / PLUS / RBRACKET]
+// [184, qualified_uident → • PACKAGE_NAME DOT_UIDENT, COMMA / PLUS / RBRACKET]
+// [221, separated_nonempty_list(PLUS,type_constraint) → • type_constraint, COMMA / RBRACKET]
+// [222, separated_nonempty_list(PLUS,type_constraint) → • type_constraint PLUS separated_nonempty_list(PLUS,type_constraint), COMMA / RBRACKET]
+// [222, separated_nonempty_list(PLUS,type_constraint) → type_constraint PLUS • separated_nonempty_list(PLUS,type_constraint), COMMA / RBRACKET]
+
+///|
+fn yy_state_149(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_PACKAGE_NAME => Shift(yy_state_45)
+    T_UIDENT => Shift(yy_state_47)
+    NT_type_constraint => Shift(yy_state_148)
+    NT_separated_nonempty_list_PLUS_type_constraint_ => Shift(yy_state_150)
+    NT_qualified_uident => Shift(yy_state_151)
+    _ => Error
+  }
+}
+
+// [222, separated_nonempty_list(PLUS,type_constraint) → type_constraint PLUS separated_nonempty_list(PLUS,type_constraint) •, COMMA / RBRACKET]
+
+///|
+fn yy_state_150(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(
+    3,
+    NT_separated_nonempty_list_PLUS_type_constraint_,
+    yy_action_178,
+  )
+}
+
+// [144, type_constraint → qualified_uident •, COMMA / PLUS / RBRACKET]
+
+///|
+fn yy_state_151(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_type_constraint, yy_action_177)
+}
+
+// [137, type_param_with_constraints → uident COLON separated_nonempty_list(PLUS,type_constraint) •, COMMA / RBRACKET]
+
+///|
+fn yy_state_152(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(3, NT_type_param_with_constraints, yy_action_176)
+}
+
+// [224, separated_list(COMMA,type_param_with_constraints) → separated_nonempty_list(COMMA,type_param_with_constraints) •, RBRACKET]
+
+///|
+fn yy_state_153(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(
+    1,
+    NT_separated_list_COMMA_type_param_with_constraints_,
+    yy_action_175,
+  )
+}
+
+// [138, type_params_with_constraints → LBRACKET separated_list(COMMA,type_param_with_constraints) • RBRACKET, LIDENT / UIDENT / AMPER / PACKAGE_NAME]
+
+///|
+fn yy_state_154(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_RBRACKET => Shift(yy_state_155)
+    _ => Error
+  }
+}
+
+// [138, type_params_with_constraints → LBRACKET separated_list(COMMA,type_param_with_constraints) RBRACKET •, LIDENT / UIDENT / AMPER / PACKAGE_NAME]
+
+///|
+fn yy_state_155(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(3, NT_type_params_with_constraints, yy_action_174)
+}
+
+// [80, impl_sig → IMPL qualified_uident • FOR type_, EOF / SEMI]
+
+///|
+fn yy_state_156(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_FOR => Shift(yy_state_157)
+    _ => Error
+  }
+}
+
+// [80, impl_sig → IMPL qualified_uident FOR • type_, EOF / SEMI]
+// [146, simple_type → • simple_type QUESTION, EOF / QUESTION / SEMI]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EOF / QUESTION / SEMI]
+// [148, simple_type → • LPAREN type_ RPAREN, EOF / QUESTION / SEMI]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, EOF / QUESTION / SEMI]
+// [150, simple_type → • AMPER qualified_uident_, EOF / QUESTION / SEMI]
+// [151, simple_type → • UNDERSCORE, EOF / QUESTION / SEMI]
+// [152, type_ → • simple_type, EOF / SEMI]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [185, qualified_uident_ → • UIDENT, EOF / QUESTION / SEMI / LBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EOF / QUESTION / SEMI / LBRACKET]
+
+///|
+fn yy_state_157(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_104)
+    NT_type_ => Shift(yy_state_158)
+    _ => Error
+  }
+}
+
+// [80, impl_sig → IMPL qualified_uident FOR type_ •, EOF / SEMI]
+
+///|
+fn yy_state_158(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(4, NT_impl_sig, yy_action_173)
+}
+
+// [74, impl_sig → IMPL type_params_with_constraints • qualified_uident FOR type_, EOF / SEMI]
+// [183, qualified_uident → • UIDENT, FOR]
+// [184, qualified_uident → • PACKAGE_NAME DOT_UIDENT, FOR]
+
+///|
+fn yy_state_159(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_PACKAGE_NAME => Shift(yy_state_45)
+    T_UIDENT => Shift(yy_state_47)
+    NT_qualified_uident => Shift(yy_state_160)
+    _ => Error
+  }
+}
+
+// [74, impl_sig → IMPL type_params_with_constraints qualified_uident • FOR type_, EOF / SEMI]
+
+///|
+fn yy_state_160(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_FOR => Shift(yy_state_161)
+    _ => Error
+  }
+}
+
+// [74, impl_sig → IMPL type_params_with_constraints qualified_uident FOR • type_, EOF / SEMI]
+// [146, simple_type → • simple_type QUESTION, EOF / QUESTION / SEMI]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EOF / QUESTION / SEMI]
+// [148, simple_type → • LPAREN type_ RPAREN, EOF / QUESTION / SEMI]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, EOF / QUESTION / SEMI]
+// [150, simple_type → • AMPER qualified_uident_, EOF / QUESTION / SEMI]
+// [151, simple_type → • UNDERSCORE, EOF / QUESTION / SEMI]
+// [152, type_ → • simple_type, EOF / SEMI]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [185, qualified_uident_ → • UIDENT, EOF / QUESTION / SEMI / LBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EOF / QUESTION / SEMI / LBRACKET]
+
+///|
+fn yy_state_161(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_104)
+    NT_type_ => Shift(yy_state_162)
+    _ => Error
+  }
+}
+
+// [74, impl_sig → IMPL type_params_with_constraints qualified_uident FOR type_ •, EOF / SEMI]
+
+///|
+fn yy_state_162(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(5, NT_impl_sig, yy_action_172)
+}
+
+// [68, type_sig → ENUM • type_decl_name_with_params LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [145, type_decl_name_with_params → • uident optional_type_params_no_constraints, LBRACE]
+// [187, uident → • UIDENT, LBRACKET / LBRACE]
+
+///|
+fn yy_state_163(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_UIDENT => Shift(yy_state_23)
+    NT_uident => Shift(yy_state_164)
+    NT_type_decl_name_with_params => Shift(yy_state_176)
+    _ => Error
+  }
+}
+
+// [141, type_params_no_constraints → • LBRACKET separated_list(COMMA,type_param_no_constraints) RBRACKET, EOF / EQUAL / LPAREN / SEMI / LBRACE]
+// [142, optional_type_params_no_constraints → •, EOF / EQUAL / LPAREN / SEMI / LBRACE]
+// [143, optional_type_params_no_constraints → • type_params_no_constraints, EOF / EQUAL / LPAREN / SEMI / LBRACE]
+// [145, type_decl_name_with_params → uident • optional_type_params_no_constraints, EOF / EQUAL / LPAREN / SEMI / LBRACE]
+
+///|
+fn yy_state_164(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    NT_optional_type_params_no_constraints => Shift(yy_state_165)
+    NT_type_params_no_constraints => Shift(yy_state_166)
+    T_LBRACKET => Shift(yy_state_167)
+    T_EOF | T_EQUAL | T_LPAREN | T_SEMI | T_LBRACE =>
+      Reduce(0, NT_optional_type_params_no_constraints, yy_action_171)
+    _ => Error
+  }
+}
+
+// [145, type_decl_name_with_params → uident optional_type_params_no_constraints •, EOF / EQUAL / LPAREN / SEMI / LBRACE]
+
+///|
+fn yy_state_165(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(2, NT_type_decl_name_with_params, yy_action_170)
+}
+
+// [143, optional_type_params_no_constraints → type_params_no_constraints •, EOF / EQUAL / LPAREN / SEMI / LBRACE]
+
+///|
+fn yy_state_166(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_optional_type_params_no_constraints, yy_action_169)
+}
+
+// [139, type_param_no_constraints → • uident, COMMA / RBRACKET]
+// [140, type_param_no_constraints → • UNDERSCORE, COMMA / RBRACKET]
+// [141, type_params_no_constraints → LBRACKET • separated_list(COMMA,type_param_no_constraints) RBRACKET, EOF / EQUAL / LPAREN / SEMI / LBRACE]
+// [187, uident → • UIDENT, COMMA / RBRACKET]
+// [225, separated_list(COMMA,type_param_no_constraints) → •, RBRACKET]
+// [226, separated_list(COMMA,type_param_no_constraints) → • separated_nonempty_list(COMMA,type_param_no_constraints), RBRACKET]
+// [237, separated_nonempty_list(COMMA,type_param_no_constraints) → • type_param_no_constraints, RBRACKET]
+// [238, separated_nonempty_list(COMMA,type_param_no_constraints) → • type_param_no_constraints COMMA separated_nonempty_list(COMMA,type_param_no_constraints), RBRACKET]
+
+///|
+fn yy_state_167(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_UIDENT => Shift(yy_state_23)
+    NT_type_param_no_constraints => Shift(yy_state_168)
+    T_UNDERSCORE => Shift(yy_state_171)
+    NT_uident => Shift(yy_state_172)
+    NT_separated_nonempty_list_COMMA_type_param_no_constraints_ =>
+      Shift(yy_state_173)
+    NT_separated_list_COMMA_type_param_no_constraints_ => Shift(yy_state_174)
+    T_RBRACKET =>
+      Reduce(
+        0,
+        NT_separated_list_COMMA_type_param_no_constraints_,
+        yy_action_168,
+      )
+    _ => Error
+  }
+}
+
+// [237, separated_nonempty_list(COMMA,type_param_no_constraints) → type_param_no_constraints •, RBRACKET]
+// [238, separated_nonempty_list(COMMA,type_param_no_constraints) → type_param_no_constraints • COMMA separated_nonempty_list(COMMA,type_param_no_constraints), RBRACKET]
+
+///|
+fn yy_state_168(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_COMMA => Shift(yy_state_169)
+    T_RBRACKET =>
+      Reduce(
+        1,
+        NT_separated_nonempty_list_COMMA_type_param_no_constraints_,
+        yy_action_167,
+      )
+    _ => Error
+  }
+}
+
+// [139, type_param_no_constraints → • uident, COMMA / RBRACKET]
+// [140, type_param_no_constraints → • UNDERSCORE, COMMA / RBRACKET]
+// [187, uident → • UIDENT, COMMA / RBRACKET]
+// [237, separated_nonempty_list(COMMA,type_param_no_constraints) → • type_param_no_constraints, RBRACKET]
+// [238, separated_nonempty_list(COMMA,type_param_no_constraints) → • type_param_no_constraints COMMA separated_nonempty_list(COMMA,type_param_no_constraints), RBRACKET]
+// [238, separated_nonempty_list(COMMA,type_param_no_constraints) → type_param_no_constraints COMMA • separated_nonempty_list(COMMA,type_param_no_constraints), RBRACKET]
+
+///|
+fn yy_state_169(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_UIDENT => Shift(yy_state_23)
+    NT_type_param_no_constraints => Shift(yy_state_168)
+    NT_separated_nonempty_list_COMMA_type_param_no_constraints_ =>
+      Shift(yy_state_170)
+    T_UNDERSCORE => Shift(yy_state_171)
+    NT_uident => Shift(yy_state_172)
+    _ => Error
+  }
+}
+
+// [238, separated_nonempty_list(COMMA,type_param_no_constraints) → type_param_no_constraints COMMA separated_nonempty_list(COMMA,type_param_no_constraints) •, RBRACKET]
+
+///|
+fn yy_state_170(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(
+    3,
+    NT_separated_nonempty_list_COMMA_type_param_no_constraints_,
+    yy_action_166,
+  )
+}
+
+// [140, type_param_no_constraints → UNDERSCORE •, COMMA / RBRACKET]
+
+///|
+fn yy_state_171(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_type_param_no_constraints, yy_action_165)
+}
+
+// [139, type_param_no_constraints → uident •, COMMA / RBRACKET]
+
+///|
+fn yy_state_172(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_type_param_no_constraints, yy_action_164)
+}
+
+// [226, separated_list(COMMA,type_param_no_constraints) → separated_nonempty_list(COMMA,type_param_no_constraints) •, RBRACKET]
+
+///|
+fn yy_state_173(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(
+    1,
+    NT_separated_list_COMMA_type_param_no_constraints_,
+    yy_action_163,
+  )
+}
+
+// [141, type_params_no_constraints → LBRACKET separated_list(COMMA,type_param_no_constraints) • RBRACKET, EOF / EQUAL / LPAREN / SEMI / LBRACE]
+
+///|
+fn yy_state_174(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_RBRACKET => Shift(yy_state_175)
+    _ => Error
+  }
+}
+
+// [141, type_params_no_constraints → LBRACKET separated_list(COMMA,type_param_no_constraints) RBRACKET •, EOF / EQUAL / LPAREN / SEMI / LBRACE]
+
+///|
+fn yy_state_175(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(3, NT_type_params_no_constraints, yy_action_162)
+}
+
+// [68, type_sig → ENUM type_decl_name_with_params • LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+
+///|
+fn yy_state_176(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_LBRACE => Shift(yy_state_177)
+    _ => Error
+  }
+}
+
+// [68, type_sig → ENUM type_decl_name_with_params LBRACE • separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [120, enum_constructor → • UIDENT option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) option(eq_tag), SEMI / RBRACE]
+// [121, enum_constructor → • nonempty_list(attribute) UIDENT option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) option(eq_tag), SEMI / RBRACE]
+// [203, separated_list(SEMI,enum_constructor) → •, RBRACE]
+// [204, separated_list(SEMI,enum_constructor) → • separated_nonempty_list(SEMI,enum_constructor), RBRACE]
+// [229, nonempty_list(attribute) → • ATTRIBUTE, UIDENT]
+// [230, nonempty_list(attribute) → • ATTRIBUTE nonempty_list(attribute), UIDENT]
+// [233, separated_nonempty_list(SEMI,enum_constructor) → • enum_constructor, RBRACE]
+// [234, separated_nonempty_list(SEMI,enum_constructor) → • enum_constructor SEMI separated_nonempty_list(SEMI,enum_constructor), RBRACE]
+
+///|
+fn yy_state_177(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_ATTRIBUTE => Shift(yy_state_17)
+    NT_enum_constructor => Shift(yy_state_178)
+    NT_nonempty_list_attribute_ => Shift(yy_state_181)
+    T_UIDENT => Shift(yy_state_199)
+    NT_separated_nonempty_list_SEMI_enum_constructor_ => Shift(yy_state_202)
+    NT_separated_list_SEMI_enum_constructor_ => Shift(yy_state_203)
+    T_RBRACE =>
+      Reduce(0, NT_separated_list_SEMI_enum_constructor_, yy_action_161)
+    _ => Error
+  }
+}
+
+// [233, separated_nonempty_list(SEMI,enum_constructor) → enum_constructor •, RBRACE]
+// [234, separated_nonempty_list(SEMI,enum_constructor) → enum_constructor • SEMI separated_nonempty_list(SEMI,enum_constructor), RBRACE]
+
+///|
+fn yy_state_178(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_SEMI => Shift(yy_state_179)
+    T_RBRACE =>
+      Reduce(
+        1,
+        NT_separated_nonempty_list_SEMI_enum_constructor_,
+        yy_action_160,
+      )
+    _ => Error
+  }
+}
+
+// [120, enum_constructor → • UIDENT option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) option(eq_tag), SEMI / RBRACE]
+// [121, enum_constructor → • nonempty_list(attribute) UIDENT option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) option(eq_tag), SEMI / RBRACE]
+// [229, nonempty_list(attribute) → • ATTRIBUTE, UIDENT]
+// [230, nonempty_list(attribute) → • ATTRIBUTE nonempty_list(attribute), UIDENT]
+// [233, separated_nonempty_list(SEMI,enum_constructor) → • enum_constructor, RBRACE]
+// [234, separated_nonempty_list(SEMI,enum_constructor) → • enum_constructor SEMI separated_nonempty_list(SEMI,enum_constructor), RBRACE]
+// [234, separated_nonempty_list(SEMI,enum_constructor) → enum_constructor SEMI • separated_nonempty_list(SEMI,enum_constructor), RBRACE]
+
+///|
+fn yy_state_179(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_ATTRIBUTE => Shift(yy_state_17)
+    NT_enum_constructor => Shift(yy_state_178)
+    NT_separated_nonempty_list_SEMI_enum_constructor_ => Shift(yy_state_180)
+    NT_nonempty_list_attribute_ => Shift(yy_state_181)
+    T_UIDENT => Shift(yy_state_199)
+    _ => Error
+  }
+}
+
+// [234, separated_nonempty_list(SEMI,enum_constructor) → enum_constructor SEMI separated_nonempty_list(SEMI,enum_constructor) •, RBRACE]
+
+///|
+fn yy_state_180(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(
+    3,
+    NT_separated_nonempty_list_SEMI_enum_constructor_,
+    yy_action_159,
+  )
+}
+
+// [121, enum_constructor → nonempty_list(attribute) • UIDENT option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) option(eq_tag), SEMI / RBRACE]
+
+///|
+fn yy_state_181(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_UIDENT => Shift(yy_state_182)
+    _ => Error
+  }
+}
+
+// [121, enum_constructor → nonempty_list(attribute) UIDENT • option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) option(eq_tag), SEMI / RBRACE]
+// [215, option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) → •, EQUAL / SEMI / RBRACE]
+// [216, option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) → • LPAREN separated_nonempty_list(COMMA,constructor_param) RPAREN, EQUAL / SEMI / RBRACE]
+
+///|
+fn yy_state_182(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_LPAREN => Shift(yy_state_183)
+    NT_option_delimited_LPAREN_separated_nonempty_list_COMMA_constructor_param__RPAREN__ =>
+      Shift(yy_state_195)
+    T_EQUAL | T_SEMI | T_RBRACE =>
+      Reduce(
+        0,
+        NT_option_delimited_LPAREN_separated_nonempty_list_COMMA_constructor_param__RPAREN__,
+        yy_action_158,
+      )
+    _ => Error
+  }
+}
+
+// [122, constructor_param → • boption(MUTABLE) type_, RPAREN / COMMA]
+// [123, constructor_param → • boption(MUTABLE) post_label COLON type_, RPAREN / COMMA]
+// [213, separated_nonempty_list(COMMA,constructor_param) → • constructor_param, RPAREN]
+// [214, separated_nonempty_list(COMMA,constructor_param) → • constructor_param COMMA separated_nonempty_list(COMMA,constructor_param), RPAREN]
+// [216, option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) → LPAREN • separated_nonempty_list(COMMA,constructor_param) RPAREN, EQUAL / SEMI / RBRACE]
+// [219, boption(MUTABLE) → •, UIDENT / POST_LABEL / ASYNC / LPAREN / UNDERSCORE / AMPER / PACKAGE_NAME]
+// [220, boption(MUTABLE) → • MUTABLE, UIDENT / POST_LABEL / ASYNC / LPAREN / UNDERSCORE / AMPER / PACKAGE_NAME]
+
+///|
+fn yy_state_183(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_MUTABLE => Shift(yy_state_184)
+    NT_separated_nonempty_list_COMMA_constructor_param_ => Shift(yy_state_185)
+    NT_constructor_param => Shift(yy_state_187)
+    NT_boption_MUTABLE_ => Shift(yy_state_190)
+    T_UIDENT
+    | T_POST_LABEL
+    | T_ASYNC
+    | T_LPAREN
+    | T_UNDERSCORE
+    | T_AMPER
+    | T_PACKAGE_NAME => Reduce(0, NT_boption_MUTABLE_, yy_action_157)
+    _ => Error
+  }
+}
+
+// [220, boption(MUTABLE) → MUTABLE •, LIDENT / UIDENT / POST_LABEL / ASYNC / LPAREN / UNDERSCORE / AMPER / PACKAGE_NAME]
+
+///|
+fn yy_state_184(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_boption_MUTABLE_, yy_action_156)
+}
+
+// [216, option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) → LPAREN separated_nonempty_list(COMMA,constructor_param) • RPAREN, EQUAL / SEMI / RBRACE]
+
+///|
+fn yy_state_185(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_RPAREN => Shift(yy_state_186)
+    _ => Error
+  }
+}
+
+// [216, option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) → LPAREN separated_nonempty_list(COMMA,constructor_param) RPAREN •, EQUAL / SEMI / RBRACE]
+
+///|
+fn yy_state_186(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(
+    3,
+    NT_option_delimited_LPAREN_separated_nonempty_list_COMMA_constructor_param__RPAREN__,
+    yy_action_154,
+  )
+}
+
+// [213, separated_nonempty_list(COMMA,constructor_param) → constructor_param •, RPAREN]
+// [214, separated_nonempty_list(COMMA,constructor_param) → constructor_param • COMMA separated_nonempty_list(COMMA,constructor_param), RPAREN]
+
+///|
+fn yy_state_187(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_COMMA => Shift(yy_state_188)
+    T_RPAREN =>
+      Reduce(
+        1,
+        NT_separated_nonempty_list_COMMA_constructor_param_,
+        yy_action_153,
+      )
+    _ => Error
+  }
+}
+
+// [122, constructor_param → • boption(MUTABLE) type_, RPAREN / COMMA]
+// [123, constructor_param → • boption(MUTABLE) post_label COLON type_, RPAREN / COMMA]
+// [213, separated_nonempty_list(COMMA,constructor_param) → • constructor_param, RPAREN]
+// [214, separated_nonempty_list(COMMA,constructor_param) → • constructor_param COMMA separated_nonempty_list(COMMA,constructor_param), RPAREN]
+// [214, separated_nonempty_list(COMMA,constructor_param) → constructor_param COMMA • separated_nonempty_list(COMMA,constructor_param), RPAREN]
+// [219, boption(MUTABLE) → •, UIDENT / POST_LABEL / ASYNC / LPAREN / UNDERSCORE / AMPER / PACKAGE_NAME]
+// [220, boption(MUTABLE) → • MUTABLE, UIDENT / POST_LABEL / ASYNC / LPAREN / UNDERSCORE / AMPER / PACKAGE_NAME]
+
+///|
+fn yy_state_188(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_MUTABLE => Shift(yy_state_184)
+    NT_constructor_param => Shift(yy_state_187)
+    NT_separated_nonempty_list_COMMA_constructor_param_ => Shift(yy_state_189)
+    NT_boption_MUTABLE_ => Shift(yy_state_190)
+    T_UIDENT
+    | T_POST_LABEL
+    | T_ASYNC
+    | T_LPAREN
+    | T_UNDERSCORE
+    | T_AMPER
+    | T_PACKAGE_NAME => Reduce(0, NT_boption_MUTABLE_, yy_action_157)
+    _ => Error
+  }
+}
+
+// [214, separated_nonempty_list(COMMA,constructor_param) → constructor_param COMMA separated_nonempty_list(COMMA,constructor_param) •, RPAREN]
+
+///|
+fn yy_state_189(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(
+    3,
+    NT_separated_nonempty_list_COMMA_constructor_param_,
+    yy_action_152,
+  )
+}
+
+// [122, constructor_param → boption(MUTABLE) • type_, RPAREN / COMMA]
+// [123, constructor_param → boption(MUTABLE) • post_label COLON type_, RPAREN / COMMA]
+// [146, simple_type → • simple_type QUESTION, RPAREN / COMMA / QUESTION]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, RPAREN / COMMA / QUESTION]
+// [148, simple_type → • LPAREN type_ RPAREN, RPAREN / COMMA / QUESTION]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, RPAREN / COMMA / QUESTION]
+// [150, simple_type → • AMPER qualified_uident_, RPAREN / COMMA / QUESTION]
+// [151, simple_type → • UNDERSCORE, RPAREN / COMMA / QUESTION]
+// [152, type_ → • simple_type, RPAREN / COMMA]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [185, qualified_uident_ → • UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
+// [190, post_label → • POST_LABEL, COLON]
+
+///|
+fn yy_state_190(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_POST_LABEL => Shift(yy_state_59)
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_104)
+    NT_post_label => Shift(yy_state_191)
+    NT_type_ => Shift(yy_state_194)
+    _ => Error
+  }
+}
+
+// [123, constructor_param → boption(MUTABLE) post_label • COLON type_, RPAREN / COMMA]
+
+///|
+fn yy_state_191(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_COLON => Shift(yy_state_192)
+    _ => Error
+  }
+}
+
+// [123, constructor_param → boption(MUTABLE) post_label COLON • type_, RPAREN / COMMA]
+// [146, simple_type → • simple_type QUESTION, RPAREN / COMMA / QUESTION]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, RPAREN / COMMA / QUESTION]
+// [148, simple_type → • LPAREN type_ RPAREN, RPAREN / COMMA / QUESTION]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, RPAREN / COMMA / QUESTION]
+// [150, simple_type → • AMPER qualified_uident_, RPAREN / COMMA / QUESTION]
+// [151, simple_type → • UNDERSCORE, RPAREN / COMMA / QUESTION]
+// [152, type_ → • simple_type, RPAREN / COMMA]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [185, qualified_uident_ → • UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
+
+///|
+fn yy_state_192(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_104)
+    NT_type_ => Shift(yy_state_193)
+    _ => Error
+  }
+}
+
+// [123, constructor_param → boption(MUTABLE) post_label COLON type_ •, RPAREN / COMMA]
+
+///|
+fn yy_state_193(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(4, NT_constructor_param, yy_action_151)
+}
+
+// [122, constructor_param → boption(MUTABLE) type_ •, RPAREN / COMMA]
+
+///|
+fn yy_state_194(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(2, NT_constructor_param, yy_action_150)
+}
+
+// [121, enum_constructor → nonempty_list(attribute) UIDENT option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) • option(eq_tag), SEMI / RBRACE]
+// [217, option(eq_tag) → •, SEMI / RBRACE]
+// [218, option(eq_tag) → • EQUAL INT, SEMI / RBRACE]
+
+///|
+fn yy_state_195(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_EQUAL => Shift(yy_state_196)
+    NT_option_eq_tag_ => Shift(yy_state_198)
+    T_SEMI | T_RBRACE => Reduce(0, NT_option_eq_tag_, yy_action_149)
+    _ => Error
+  }
+}
+
+// [218, option(eq_tag) → EQUAL • INT, SEMI / RBRACE]
+
+///|
+fn yy_state_196(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_INT => Shift(yy_state_197)
+    _ => Error
+  }
+}
+
+// [218, option(eq_tag) → EQUAL INT •, SEMI / RBRACE]
+
+///|
+fn yy_state_197(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(2, NT_option_eq_tag_, yy_action_147)
+}
+
+// [121, enum_constructor → nonempty_list(attribute) UIDENT option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) option(eq_tag) •, SEMI / RBRACE]
+
+///|
+fn yy_state_198(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(4, NT_enum_constructor, yy_action_146)
+}
+
+// [120, enum_constructor → UIDENT • option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) option(eq_tag), SEMI / RBRACE]
+// [215, option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) → •, EQUAL / SEMI / RBRACE]
+// [216, option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) → • LPAREN separated_nonempty_list(COMMA,constructor_param) RPAREN, EQUAL / SEMI / RBRACE]
+
+///|
+fn yy_state_199(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_LPAREN => Shift(yy_state_183)
+    NT_option_delimited_LPAREN_separated_nonempty_list_COMMA_constructor_param__RPAREN__ =>
+      Shift(yy_state_200)
+    T_EQUAL | T_SEMI | T_RBRACE =>
+      Reduce(
+        0,
+        NT_option_delimited_LPAREN_separated_nonempty_list_COMMA_constructor_param__RPAREN__,
+        yy_action_158,
+      )
+    _ => Error
+  }
+}
+
+// [120, enum_constructor → UIDENT option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) • option(eq_tag), SEMI / RBRACE]
+// [217, option(eq_tag) → •, SEMI / RBRACE]
+// [218, option(eq_tag) → • EQUAL INT, SEMI / RBRACE]
+
+///|
+fn yy_state_200(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_EQUAL => Shift(yy_state_196)
+    NT_option_eq_tag_ => Shift(yy_state_201)
+    T_SEMI | T_RBRACE => Reduce(0, NT_option_eq_tag_, yy_action_149)
+    _ => Error
+  }
+}
+
+// [120, enum_constructor → UIDENT option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) option(eq_tag) •, SEMI / RBRACE]
+
+///|
+fn yy_state_201(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(3, NT_enum_constructor, yy_action_145)
+}
+
+// [204, separated_list(SEMI,enum_constructor) → separated_nonempty_list(SEMI,enum_constructor) •, RBRACE]
+
+///|
+fn yy_state_202(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_separated_list_SEMI_enum_constructor_, yy_action_144)
+}
+
+// [68, type_sig → ENUM type_decl_name_with_params LBRACE separated_list(SEMI,enum_constructor) • RBRACE, EOF / SEMI]
+
+///|
+fn yy_state_203(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_RBRACE => Shift(yy_state_204)
+    _ => Error
+  }
+}
+
+// [68, type_sig → ENUM type_decl_name_with_params LBRACE separated_list(SEMI,enum_constructor) RBRACE •, EOF / SEMI]
+
+///|
+fn yy_state_204(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(5, NT_type_sig, yy_action_143)
+}
+
+// [56, type_sig → STRUCT • type_decl_name_with_params LBRACE record_decl_body RBRACE, EOF / SEMI]
+// [62, type_sig → STRUCT • type_decl_name_with_params LPAREN separated_list(COMMA,type_) RPAREN, EOF / SEMI]
+// [145, type_decl_name_with_params → • uident optional_type_params_no_constraints, LPAREN / LBRACE]
+// [187, uident → • UIDENT, LPAREN / LBRACKET / LBRACE]
+
+///|
+fn yy_state_205(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_UIDENT => Shift(yy_state_23)
+    NT_uident => Shift(yy_state_164)
+    NT_type_decl_name_with_params => Shift(yy_state_206)
+    _ => Error
+  }
+}
+
+// [56, type_sig → STRUCT type_decl_name_with_params • LBRACE record_decl_body RBRACE, EOF / SEMI]
+// [62, type_sig → STRUCT type_decl_name_with_params • LPAREN separated_list(COMMA,type_) RPAREN, EOF / SEMI]
+
+///|
+fn yy_state_206(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_LPAREN => Shift(yy_state_207)
+    T_LBRACE => Shift(yy_state_211)
+    _ => Error
+  }
+}
+
+// [62, type_sig → STRUCT type_decl_name_with_params LPAREN • separated_list(COMMA,type_) RPAREN, EOF / SEMI]
+// [146, simple_type → • simple_type QUESTION, RPAREN / COMMA / QUESTION]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, RPAREN / COMMA / QUESTION]
+// [148, simple_type → • LPAREN type_ RPAREN, RPAREN / COMMA / QUESTION]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, RPAREN / COMMA / QUESTION]
+// [150, simple_type → • AMPER qualified_uident_, RPAREN / COMMA / QUESTION]
+// [151, simple_type → • UNDERSCORE, RPAREN / COMMA / QUESTION]
+// [152, type_ → • simple_type, RPAREN / COMMA]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [185, qualified_uident_ → • UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
+// [205, separated_list(COMMA,type_) → •, RPAREN]
+// [206, separated_list(COMMA,type_) → • separated_nonempty_list(COMMA,type_), RPAREN]
+// [227, separated_nonempty_list(COMMA,type_) → • type_, RPAREN]
+// [228, separated_nonempty_list(COMMA,type_) → • type_ COMMA separated_nonempty_list(COMMA,type_), RPAREN]
+
+///|
+fn yy_state_207(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    NT_type_ => Shift(yy_state_79)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_104)
+    NT_separated_nonempty_list_COMMA_type__ => Shift(yy_state_208)
+    NT_separated_list_COMMA_type__ => Shift(yy_state_209)
+    T_RPAREN => Reduce(0, NT_separated_list_COMMA_type__, yy_action_142)
+    _ => Error
+  }
+}
+
+// [206, separated_list(COMMA,type_) → separated_nonempty_list(COMMA,type_) •, RPAREN]
+
+///|
+fn yy_state_208(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_separated_list_COMMA_type__, yy_action_141)
+}
+
+// [62, type_sig → STRUCT type_decl_name_with_params LPAREN separated_list(COMMA,type_) • RPAREN, EOF / SEMI]
+
+///|
+fn yy_state_209(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_RPAREN => Shift(yy_state_210)
+    _ => Error
+  }
+}
+
+// [62, type_sig → STRUCT type_decl_name_with_params LPAREN separated_list(COMMA,type_) RPAREN •, EOF / SEMI]
+
+///|
+fn yy_state_210(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(5, NT_type_sig, yy_action_140)
+}
+
+// [56, type_sig → STRUCT type_decl_name_with_params LBRACE • record_decl_body RBRACE, EOF / SEMI]
+// [124, record_decl_field → • boption(MUTABLE) LIDENT COLON type_, SEMI / RBRACE]
+// [125, record_decl_field → • nonempty_list(attribute) boption(MUTABLE) LIDENT COLON type_, SEMI / RBRACE]
+// [126, record_decl_constr → • ASYNC FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, RBRACE]
+// [127, record_decl_constr → • FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, RBRACE]
+// [128, record_decl_constr → • nonempty_list(attribute) ASYNC FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, RBRACE]
+// [129, record_decl_constr → • nonempty_list(attribute) FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, RBRACE]
+// [130, record_decl_body → •, RBRACE]
+// [131, record_decl_body → • record_decl_constr, RBRACE]
+// [132, record_decl_body → • record_decl_body_nonempty, RBRACE]
+// [133, record_decl_body_nonempty → • record_decl_field SEMI record_decl_constr, RBRACE]
+// [134, record_decl_body_nonempty → • record_decl_field, RBRACE]
+// [135, record_decl_body_nonempty → • record_decl_field SEMI record_decl_body_nonempty, RBRACE]
+// [219, boption(MUTABLE) → •, LIDENT]
+// [220, boption(MUTABLE) → • MUTABLE, LIDENT]
+// [229, nonempty_list(attribute) → • ATTRIBUTE, LIDENT / ASYNC / FN / MUTABLE]
+// [230, nonempty_list(attribute) → • ATTRIBUTE nonempty_list(attribute), LIDENT / ASYNC / FN / MUTABLE]
+
+///|
+fn yy_state_211(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_ATTRIBUTE => Shift(yy_state_17)
+    T_MUTABLE => Shift(yy_state_184)
+    NT_record_decl_field => Shift(yy_state_212)
+    T_FN => Shift(yy_state_216)
+    T_ASYNC => Shift(yy_state_232)
+    NT_nonempty_list_attribute_ => Shift(yy_state_242)
+    NT_boption_MUTABLE_ => Shift(yy_state_266)
+    NT_record_decl_body_nonempty => Shift(yy_state_270)
+    NT_record_decl_constr => Shift(yy_state_271)
+    NT_record_decl_body => Shift(yy_state_272)
+    T_RBRACE => Reduce(0, NT_record_decl_body, yy_action_139)
+    T_LIDENT => Reduce(0, NT_boption_MUTABLE_, yy_action_157)
+    _ => Error
+  }
+}
+
+// [133, record_decl_body_nonempty → record_decl_field • SEMI record_decl_constr, RBRACE]
+// [134, record_decl_body_nonempty → record_decl_field •, RBRACE]
+// [135, record_decl_body_nonempty → record_decl_field • SEMI record_decl_body_nonempty, RBRACE]
+
+///|
+fn yy_state_212(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_SEMI => Shift(yy_state_213)
+    T_RBRACE => Reduce(1, NT_record_decl_body_nonempty, yy_action_138)
+    _ => Error
+  }
+}
+
+// [124, record_decl_field → • boption(MUTABLE) LIDENT COLON type_, SEMI / RBRACE]
+// [125, record_decl_field → • nonempty_list(attribute) boption(MUTABLE) LIDENT COLON type_, SEMI / RBRACE]
+// [126, record_decl_constr → • ASYNC FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, RBRACE]
+// [127, record_decl_constr → • FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, RBRACE]
+// [128, record_decl_constr → • nonempty_list(attribute) ASYNC FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, RBRACE]
+// [129, record_decl_constr → • nonempty_list(attribute) FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, RBRACE]
+// [133, record_decl_body_nonempty → • record_decl_field SEMI record_decl_constr, RBRACE]
+// [133, record_decl_body_nonempty → record_decl_field SEMI • record_decl_constr, RBRACE]
+// [134, record_decl_body_nonempty → • record_decl_field, RBRACE]
+// [135, record_decl_body_nonempty → • record_decl_field SEMI record_decl_body_nonempty, RBRACE]
+// [135, record_decl_body_nonempty → record_decl_field SEMI • record_decl_body_nonempty, RBRACE]
+// [219, boption(MUTABLE) → •, LIDENT]
+// [220, boption(MUTABLE) → • MUTABLE, LIDENT]
+// [229, nonempty_list(attribute) → • ATTRIBUTE, LIDENT / ASYNC / FN / MUTABLE]
+// [230, nonempty_list(attribute) → • ATTRIBUTE nonempty_list(attribute), LIDENT / ASYNC / FN / MUTABLE]
+
+///|
+fn yy_state_213(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_ATTRIBUTE => Shift(yy_state_17)
+    T_MUTABLE => Shift(yy_state_184)
+    NT_record_decl_field => Shift(yy_state_212)
+    NT_record_decl_body_nonempty => Shift(yy_state_214)
+    NT_record_decl_constr => Shift(yy_state_215)
+    T_FN => Shift(yy_state_216)
+    T_ASYNC => Shift(yy_state_232)
+    NT_nonempty_list_attribute_ => Shift(yy_state_242)
+    NT_boption_MUTABLE_ => Shift(yy_state_266)
+    T_LIDENT => Reduce(0, NT_boption_MUTABLE_, yy_action_157)
+    _ => Error
+  }
+}
+
+// [135, record_decl_body_nonempty → record_decl_field SEMI record_decl_body_nonempty •, RBRACE]
+
+///|
+fn yy_state_214(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(3, NT_record_decl_body_nonempty, yy_action_137)
+}
+
+// [133, record_decl_body_nonempty → record_decl_field SEMI record_decl_constr •, RBRACE]
+
+///|
+fn yy_state_215(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(3, NT_record_decl_body_nonempty, yy_action_136)
+}
+
+// [127, record_decl_constr → FN • loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, RBRACE]
+// [138, type_params_with_constraints → • LBRACKET separated_list(COMMA,type_param_with_constraints) RBRACKET, LIDENT / UIDENT / AMPER]
+// [193, loption(type_params_with_constraints) → •, LIDENT / UIDENT / AMPER]
+// [194, loption(type_params_with_constraints) → • type_params_with_constraints, LIDENT / UIDENT / AMPER]
+
+///|
+fn yy_state_216(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_LBRACKET => Shift(yy_state_142)
+    NT_type_params_with_constraints => Shift(yy_state_217)
+    NT_loption_type_params_with_constraints_ => Shift(yy_state_218)
+    T_LIDENT | T_UIDENT | T_AMPER =>
+      Reduce(0, NT_loption_type_params_with_constraints_, yy_action_135)
+    _ => Error
+  }
+}
+
+// [194, loption(type_params_with_constraints) → type_params_with_constraints •, LIDENT / UIDENT / AMPER]
+
+///|
+fn yy_state_217(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_loption_type_params_with_constraints_, yy_action_134)
+}
+
+// [28, method_self_type_coloncolon → • UIDENT COLONCOLON, LIDENT]
+// [29, method_self_type_coloncolon → • AMPER UIDENT COLONCOLON, LIDENT]
+// [127, record_decl_constr → FN loption(type_params_with_constraints) • option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, RBRACE]
+// [195, option(method_self_type_coloncolon) → •, LIDENT]
+// [196, option(method_self_type_coloncolon) → • method_self_type_coloncolon, LIDENT]
+
+///|
+fn yy_state_218(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    NT_method_self_type_coloncolon => Shift(yy_state_219)
+    NT_option_method_self_type_coloncolon_ => Shift(yy_state_220)
+    T_AMPER => Shift(yy_state_227)
+    T_UIDENT => Shift(yy_state_230)
+    T_LIDENT => Reduce(0, NT_option_method_self_type_coloncolon_, yy_action_133)
+    _ => Error
+  }
+}
+
+// [196, option(method_self_type_coloncolon) → method_self_type_coloncolon •, LIDENT]
+
+///|
+fn yy_state_219(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_option_method_self_type_coloncolon_, yy_action_132)
+}
+
+// [127, record_decl_constr → FN loption(type_params_with_constraints) option(method_self_type_coloncolon) • lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, RBRACE]
+// [188, lident → • LIDENT, LPAREN]
+
+///|
+fn yy_state_220(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_LIDENT => Shift(yy_state_36)
+    NT_lident => Shift(yy_state_221)
+    _ => Error
+  }
+}
+
+// [127, record_decl_constr → FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident • LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, RBRACE]
+
+///|
+fn yy_state_221(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_LPAREN => Shift(yy_state_222)
+    _ => Error
+  }
+}
+
+// [127, record_decl_constr → FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN • separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, RBRACE]
+// [146, simple_type → • simple_type QUESTION, RPAREN / COMMA / QUESTION]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, RPAREN / COMMA / QUESTION]
+// [148, simple_type → • LPAREN type_ RPAREN, RPAREN / COMMA / QUESTION]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, RPAREN / COMMA / QUESTION]
+// [150, simple_type → • AMPER qualified_uident_, RPAREN / COMMA / QUESTION]
+// [151, simple_type → • UNDERSCORE, RPAREN / COMMA / QUESTION]
+// [152, type_ → • simple_type, RPAREN / COMMA]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [168, parameter → • type_, RPAREN / COMMA]
+// [169, parameter → • post_label COLON type_, RPAREN / COMMA]
+// [170, parameter → • label QUESTION COLON type_, RPAREN / COMMA]
+// [185, qualified_uident_ → • UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
+// [189, label → • LIDENT, QUESTION]
+// [190, post_label → • POST_LABEL, COLON]
+// [197, separated_list(COMMA,parameter) → •, RPAREN]
+// [198, separated_list(COMMA,parameter) → • separated_nonempty_list(COMMA,parameter), RPAREN]
+// [231, separated_nonempty_list(COMMA,parameter) → • parameter, RPAREN]
+// [232, separated_nonempty_list(COMMA,parameter) → • parameter COMMA separated_nonempty_list(COMMA,parameter), RPAREN]
+
+///|
+fn yy_state_222(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    NT_parameter => Shift(yy_state_56)
+    T_POST_LABEL => Shift(yy_state_59)
+    T_LIDENT => Shift(yy_state_60)
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    NT_label => Shift(yy_state_64)
+    T_ASYNC => Shift(yy_state_68)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_104)
+    NT_post_label => Shift(yy_state_120)
+    NT_type_ => Shift(yy_state_123)
+    NT_separated_nonempty_list_COMMA_parameter_ => Shift(yy_state_124)
+    NT_separated_list_COMMA_parameter_ => Shift(yy_state_223)
+    T_RPAREN => Reduce(0, NT_separated_list_COMMA_parameter_, yy_action_227)
+    _ => Error
+  }
+}
+
+// [127, record_decl_constr → FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) • RPAREN THIN_ARROW return_type, RBRACE]
+
+///|
+fn yy_state_223(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_RPAREN => Shift(yy_state_224)
+    _ => Error
+  }
+}
+
+// [127, record_decl_constr → FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN • THIN_ARROW return_type, RBRACE]
+
+///|
+fn yy_state_224(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_THIN_ARROW => Shift(yy_state_225)
+    _ => Error
+  }
+}
+
+// [127, record_decl_constr → FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW • return_type, RBRACE]
+// [146, simple_type → • simple_type QUESTION, RAISE / QUESTION / RBRACE]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, RAISE / QUESTION / RBRACE]
+// [148, simple_type → • LPAREN type_ RPAREN, RAISE / QUESTION / RBRACE]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, RAISE / QUESTION / RBRACE]
+// [150, simple_type → • AMPER qualified_uident_, RAISE / QUESTION / RBRACE]
+// [151, simple_type → • UNDERSCORE, RAISE / QUESTION / RBRACE]
+// [152, type_ → • simple_type, RBRACE]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RBRACE]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RBRACE]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RBRACE]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RBRACE]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, RBRACE]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, RBRACE]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, RBRACE]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, RBRACE]
+// [161, return_type → • type_, RBRACE]
+// [162, return_type → • simple_type RAISE, RBRACE]
+// [163, return_type → • simple_type RAISE error_type, RBRACE]
+// [164, return_type → • simple_type RAISE QUESTION, RBRACE]
+// [185, qualified_uident_ → • UIDENT, RAISE / QUESTION / LBRACKET / RBRACE]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, RAISE / QUESTION / LBRACKET / RBRACE]
+
+///|
+fn yy_state_225(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    NT_type_ => Shift(yy_state_72)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_86)
+    NT_return_type => Shift(yy_state_226)
+    _ => Error
+  }
+}
+
+// [127, record_decl_constr → FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type •, RBRACE]
+
+///|
+fn yy_state_226(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(9, NT_record_decl_constr, yy_action_131)
+}
+
+// [29, method_self_type_coloncolon → AMPER • UIDENT COLONCOLON, LIDENT]
+
+///|
+fn yy_state_227(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_UIDENT => Shift(yy_state_228)
+    _ => Error
+  }
+}
+
+// [29, method_self_type_coloncolon → AMPER UIDENT • COLONCOLON, LIDENT]
+
+///|
+fn yy_state_228(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_COLONCOLON => Shift(yy_state_229)
+    _ => Error
+  }
+}
+
+// [29, method_self_type_coloncolon → AMPER UIDENT COLONCOLON •, LIDENT]
+
+///|
+fn yy_state_229(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(3, NT_method_self_type_coloncolon, yy_action_130)
+}
+
+// [28, method_self_type_coloncolon → UIDENT • COLONCOLON, LIDENT]
+
+///|
+fn yy_state_230(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_COLONCOLON => Shift(yy_state_231)
+    _ => Error
+  }
+}
+
+// [28, method_self_type_coloncolon → UIDENT COLONCOLON •, LIDENT]
+
+///|
+fn yy_state_231(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(2, NT_method_self_type_coloncolon, yy_action_129)
+}
+
+// [126, record_decl_constr → ASYNC • FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, RBRACE]
+
+///|
+fn yy_state_232(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_FN => Shift(yy_state_233)
+    _ => Error
+  }
+}
+
+// [126, record_decl_constr → ASYNC FN • loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, RBRACE]
+// [138, type_params_with_constraints → • LBRACKET separated_list(COMMA,type_param_with_constraints) RBRACKET, LIDENT / UIDENT / AMPER]
+// [193, loption(type_params_with_constraints) → •, LIDENT / UIDENT / AMPER]
+// [194, loption(type_params_with_constraints) → • type_params_with_constraints, LIDENT / UIDENT / AMPER]
+
+///|
+fn yy_state_233(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_LBRACKET => Shift(yy_state_142)
+    NT_type_params_with_constraints => Shift(yy_state_217)
+    NT_loption_type_params_with_constraints_ => Shift(yy_state_234)
+    T_LIDENT | T_UIDENT | T_AMPER =>
+      Reduce(0, NT_loption_type_params_with_constraints_, yy_action_135)
+    _ => Error
+  }
+}
+
+// [28, method_self_type_coloncolon → • UIDENT COLONCOLON, LIDENT]
+// [29, method_self_type_coloncolon → • AMPER UIDENT COLONCOLON, LIDENT]
+// [126, record_decl_constr → ASYNC FN loption(type_params_with_constraints) • option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, RBRACE]
+// [195, option(method_self_type_coloncolon) → •, LIDENT]
+// [196, option(method_self_type_coloncolon) → • method_self_type_coloncolon, LIDENT]
+
+///|
+fn yy_state_234(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    NT_method_self_type_coloncolon => Shift(yy_state_219)
+    T_AMPER => Shift(yy_state_227)
+    T_UIDENT => Shift(yy_state_230)
+    NT_option_method_self_type_coloncolon_ => Shift(yy_state_235)
+    T_LIDENT => Reduce(0, NT_option_method_self_type_coloncolon_, yy_action_133)
+    _ => Error
+  }
+}
+
+// [126, record_decl_constr → ASYNC FN loption(type_params_with_constraints) option(method_self_type_coloncolon) • lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, RBRACE]
+// [188, lident → • LIDENT, LPAREN]
+
+///|
+fn yy_state_235(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_LIDENT => Shift(yy_state_36)
+    NT_lident => Shift(yy_state_236)
+    _ => Error
+  }
+}
+
+// [126, record_decl_constr → ASYNC FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident • LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, RBRACE]
+
+///|
+fn yy_state_236(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_LPAREN => Shift(yy_state_237)
+    _ => Error
+  }
+}
+
+// [126, record_decl_constr → ASYNC FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN • separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, RBRACE]
+// [146, simple_type → • simple_type QUESTION, RPAREN / COMMA / QUESTION]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, RPAREN / COMMA / QUESTION]
+// [148, simple_type → • LPAREN type_ RPAREN, RPAREN / COMMA / QUESTION]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, RPAREN / COMMA / QUESTION]
+// [150, simple_type → • AMPER qualified_uident_, RPAREN / COMMA / QUESTION]
+// [151, simple_type → • UNDERSCORE, RPAREN / COMMA / QUESTION]
+// [152, type_ → • simple_type, RPAREN / COMMA]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [168, parameter → • type_, RPAREN / COMMA]
+// [169, parameter → • post_label COLON type_, RPAREN / COMMA]
+// [170, parameter → • label QUESTION COLON type_, RPAREN / COMMA]
+// [185, qualified_uident_ → • UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
+// [189, label → • LIDENT, QUESTION]
+// [190, post_label → • POST_LABEL, COLON]
+// [197, separated_list(COMMA,parameter) → •, RPAREN]
+// [198, separated_list(COMMA,parameter) → • separated_nonempty_list(COMMA,parameter), RPAREN]
+// [231, separated_nonempty_list(COMMA,parameter) → • parameter, RPAREN]
+// [232, separated_nonempty_list(COMMA,parameter) → • parameter COMMA separated_nonempty_list(COMMA,parameter), RPAREN]
+
+///|
+fn yy_state_237(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    NT_parameter => Shift(yy_state_56)
+    T_POST_LABEL => Shift(yy_state_59)
+    T_LIDENT => Shift(yy_state_60)
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    NT_label => Shift(yy_state_64)
+    T_ASYNC => Shift(yy_state_68)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_104)
+    NT_post_label => Shift(yy_state_120)
+    NT_type_ => Shift(yy_state_123)
+    NT_separated_nonempty_list_COMMA_parameter_ => Shift(yy_state_124)
+    NT_separated_list_COMMA_parameter_ => Shift(yy_state_238)
+    T_RPAREN => Reduce(0, NT_separated_list_COMMA_parameter_, yy_action_227)
+    _ => Error
+  }
+}
+
+// [126, record_decl_constr → ASYNC FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) • RPAREN THIN_ARROW return_type, RBRACE]
+
+///|
+fn yy_state_238(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_RPAREN => Shift(yy_state_239)
+    _ => Error
+  }
+}
+
+// [126, record_decl_constr → ASYNC FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN • THIN_ARROW return_type, RBRACE]
+
+///|
+fn yy_state_239(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_THIN_ARROW => Shift(yy_state_240)
+    _ => Error
+  }
+}
+
+// [126, record_decl_constr → ASYNC FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW • return_type, RBRACE]
+// [146, simple_type → • simple_type QUESTION, RAISE / QUESTION / RBRACE]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, RAISE / QUESTION / RBRACE]
+// [148, simple_type → • LPAREN type_ RPAREN, RAISE / QUESTION / RBRACE]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, RAISE / QUESTION / RBRACE]
+// [150, simple_type → • AMPER qualified_uident_, RAISE / QUESTION / RBRACE]
+// [151, simple_type → • UNDERSCORE, RAISE / QUESTION / RBRACE]
+// [152, type_ → • simple_type, RBRACE]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RBRACE]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RBRACE]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RBRACE]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RBRACE]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, RBRACE]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, RBRACE]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, RBRACE]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, RBRACE]
+// [161, return_type → • type_, RBRACE]
+// [162, return_type → • simple_type RAISE, RBRACE]
+// [163, return_type → • simple_type RAISE error_type, RBRACE]
+// [164, return_type → • simple_type RAISE QUESTION, RBRACE]
+// [185, qualified_uident_ → • UIDENT, RAISE / QUESTION / LBRACKET / RBRACE]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, RAISE / QUESTION / LBRACKET / RBRACE]
+
+///|
+fn yy_state_240(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    NT_type_ => Shift(yy_state_72)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_86)
+    NT_return_type => Shift(yy_state_241)
+    _ => Error
+  }
+}
+
+// [126, record_decl_constr → ASYNC FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type •, RBRACE]
+
+///|
+fn yy_state_241(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(10, NT_record_decl_constr, yy_action_128)
+}
+
+// [125, record_decl_field → nonempty_list(attribute) • boption(MUTABLE) LIDENT COLON type_, SEMI / RBRACE]
+// [128, record_decl_constr → nonempty_list(attribute) • ASYNC FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, RBRACE]
+// [129, record_decl_constr → nonempty_list(attribute) • FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, RBRACE]
+// [219, boption(MUTABLE) → •, LIDENT]
+// [220, boption(MUTABLE) → • MUTABLE, LIDENT]
+
+///|
+fn yy_state_242(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_MUTABLE => Shift(yy_state_184)
+    T_FN => Shift(yy_state_243)
+    T_ASYNC => Shift(yy_state_252)
+    NT_boption_MUTABLE_ => Shift(yy_state_262)
+    T_LIDENT => Reduce(0, NT_boption_MUTABLE_, yy_action_157)
+    _ => Error
+  }
+}
+
+// [129, record_decl_constr → nonempty_list(attribute) FN • loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, RBRACE]
+// [138, type_params_with_constraints → • LBRACKET separated_list(COMMA,type_param_with_constraints) RBRACKET, LIDENT / UIDENT / AMPER]
+// [193, loption(type_params_with_constraints) → •, LIDENT / UIDENT / AMPER]
+// [194, loption(type_params_with_constraints) → • type_params_with_constraints, LIDENT / UIDENT / AMPER]
+
+///|
+fn yy_state_243(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_LBRACKET => Shift(yy_state_142)
+    NT_type_params_with_constraints => Shift(yy_state_217)
+    NT_loption_type_params_with_constraints_ => Shift(yy_state_244)
+    T_LIDENT | T_UIDENT | T_AMPER =>
+      Reduce(0, NT_loption_type_params_with_constraints_, yy_action_135)
+    _ => Error
+  }
+}
+
+// [28, method_self_type_coloncolon → • UIDENT COLONCOLON, LIDENT]
+// [29, method_self_type_coloncolon → • AMPER UIDENT COLONCOLON, LIDENT]
+// [129, record_decl_constr → nonempty_list(attribute) FN loption(type_params_with_constraints) • option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, RBRACE]
+// [195, option(method_self_type_coloncolon) → •, LIDENT]
+// [196, option(method_self_type_coloncolon) → • method_self_type_coloncolon, LIDENT]
+
+///|
+fn yy_state_244(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    NT_method_self_type_coloncolon => Shift(yy_state_219)
+    T_AMPER => Shift(yy_state_227)
+    T_UIDENT => Shift(yy_state_230)
+    NT_option_method_self_type_coloncolon_ => Shift(yy_state_245)
+    T_LIDENT => Reduce(0, NT_option_method_self_type_coloncolon_, yy_action_133)
+    _ => Error
+  }
+}
+
+// [129, record_decl_constr → nonempty_list(attribute) FN loption(type_params_with_constraints) option(method_self_type_coloncolon) • lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, RBRACE]
+// [188, lident → • LIDENT, LPAREN]
+
+///|
+fn yy_state_245(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_LIDENT => Shift(yy_state_36)
+    NT_lident => Shift(yy_state_246)
+    _ => Error
+  }
+}
+
+// [129, record_decl_constr → nonempty_list(attribute) FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident • LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, RBRACE]
+
+///|
+fn yy_state_246(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_LPAREN => Shift(yy_state_247)
+    _ => Error
+  }
+}
+
+// [129, record_decl_constr → nonempty_list(attribute) FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN • separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, RBRACE]
+// [146, simple_type → • simple_type QUESTION, RPAREN / COMMA / QUESTION]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, RPAREN / COMMA / QUESTION]
+// [148, simple_type → • LPAREN type_ RPAREN, RPAREN / COMMA / QUESTION]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, RPAREN / COMMA / QUESTION]
+// [150, simple_type → • AMPER qualified_uident_, RPAREN / COMMA / QUESTION]
+// [151, simple_type → • UNDERSCORE, RPAREN / COMMA / QUESTION]
+// [152, type_ → • simple_type, RPAREN / COMMA]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [168, parameter → • type_, RPAREN / COMMA]
+// [169, parameter → • post_label COLON type_, RPAREN / COMMA]
+// [170, parameter → • label QUESTION COLON type_, RPAREN / COMMA]
+// [185, qualified_uident_ → • UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
+// [189, label → • LIDENT, QUESTION]
+// [190, post_label → • POST_LABEL, COLON]
+// [197, separated_list(COMMA,parameter) → •, RPAREN]
+// [198, separated_list(COMMA,parameter) → • separated_nonempty_list(COMMA,parameter), RPAREN]
+// [231, separated_nonempty_list(COMMA,parameter) → • parameter, RPAREN]
+// [232, separated_nonempty_list(COMMA,parameter) → • parameter COMMA separated_nonempty_list(COMMA,parameter), RPAREN]
+
+///|
+fn yy_state_247(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    NT_parameter => Shift(yy_state_56)
+    T_POST_LABEL => Shift(yy_state_59)
+    T_LIDENT => Shift(yy_state_60)
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    NT_label => Shift(yy_state_64)
+    T_ASYNC => Shift(yy_state_68)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_104)
+    NT_post_label => Shift(yy_state_120)
+    NT_type_ => Shift(yy_state_123)
+    NT_separated_nonempty_list_COMMA_parameter_ => Shift(yy_state_124)
+    NT_separated_list_COMMA_parameter_ => Shift(yy_state_248)
+    T_RPAREN => Reduce(0, NT_separated_list_COMMA_parameter_, yy_action_227)
+    _ => Error
+  }
+}
+
+// [129, record_decl_constr → nonempty_list(attribute) FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) • RPAREN THIN_ARROW return_type, RBRACE]
+
+///|
+fn yy_state_248(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_RPAREN => Shift(yy_state_249)
+    _ => Error
+  }
+}
+
+// [129, record_decl_constr → nonempty_list(attribute) FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN • THIN_ARROW return_type, RBRACE]
+
+///|
+fn yy_state_249(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_THIN_ARROW => Shift(yy_state_250)
+    _ => Error
+  }
+}
+
+// [129, record_decl_constr → nonempty_list(attribute) FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW • return_type, RBRACE]
+// [146, simple_type → • simple_type QUESTION, RAISE / QUESTION / RBRACE]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, RAISE / QUESTION / RBRACE]
+// [148, simple_type → • LPAREN type_ RPAREN, RAISE / QUESTION / RBRACE]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, RAISE / QUESTION / RBRACE]
+// [150, simple_type → • AMPER qualified_uident_, RAISE / QUESTION / RBRACE]
+// [151, simple_type → • UNDERSCORE, RAISE / QUESTION / RBRACE]
+// [152, type_ → • simple_type, RBRACE]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RBRACE]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RBRACE]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RBRACE]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RBRACE]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, RBRACE]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, RBRACE]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, RBRACE]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, RBRACE]
+// [161, return_type → • type_, RBRACE]
+// [162, return_type → • simple_type RAISE, RBRACE]
+// [163, return_type → • simple_type RAISE error_type, RBRACE]
+// [164, return_type → • simple_type RAISE QUESTION, RBRACE]
+// [185, qualified_uident_ → • UIDENT, RAISE / QUESTION / LBRACKET / RBRACE]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, RAISE / QUESTION / LBRACKET / RBRACE]
+
+///|
+fn yy_state_250(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    NT_type_ => Shift(yy_state_72)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_86)
+    NT_return_type => Shift(yy_state_251)
+    _ => Error
+  }
+}
+
+// [129, record_decl_constr → nonempty_list(attribute) FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type •, RBRACE]
+
+///|
+fn yy_state_251(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(10, NT_record_decl_constr, yy_action_127)
+}
+
+// [128, record_decl_constr → nonempty_list(attribute) ASYNC • FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, RBRACE]
+
+///|
+fn yy_state_252(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_FN => Shift(yy_state_253)
+    _ => Error
+  }
+}
+
+// [128, record_decl_constr → nonempty_list(attribute) ASYNC FN • loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, RBRACE]
+// [138, type_params_with_constraints → • LBRACKET separated_list(COMMA,type_param_with_constraints) RBRACKET, LIDENT / UIDENT / AMPER]
+// [193, loption(type_params_with_constraints) → •, LIDENT / UIDENT / AMPER]
+// [194, loption(type_params_with_constraints) → • type_params_with_constraints, LIDENT / UIDENT / AMPER]
+
+///|
+fn yy_state_253(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_LBRACKET => Shift(yy_state_142)
+    NT_type_params_with_constraints => Shift(yy_state_217)
+    NT_loption_type_params_with_constraints_ => Shift(yy_state_254)
+    T_LIDENT | T_UIDENT | T_AMPER =>
+      Reduce(0, NT_loption_type_params_with_constraints_, yy_action_135)
+    _ => Error
+  }
+}
+
+// [28, method_self_type_coloncolon → • UIDENT COLONCOLON, LIDENT]
+// [29, method_self_type_coloncolon → • AMPER UIDENT COLONCOLON, LIDENT]
+// [128, record_decl_constr → nonempty_list(attribute) ASYNC FN loption(type_params_with_constraints) • option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, RBRACE]
+// [195, option(method_self_type_coloncolon) → •, LIDENT]
+// [196, option(method_self_type_coloncolon) → • method_self_type_coloncolon, LIDENT]
+
+///|
+fn yy_state_254(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    NT_method_self_type_coloncolon => Shift(yy_state_219)
+    T_AMPER => Shift(yy_state_227)
+    T_UIDENT => Shift(yy_state_230)
+    NT_option_method_self_type_coloncolon_ => Shift(yy_state_255)
+    T_LIDENT => Reduce(0, NT_option_method_self_type_coloncolon_, yy_action_133)
+    _ => Error
   }
 }
 
-// [0, mbti → • LIDENT STRING imports sigs EOF, $]
-// [1, mbti → • LIDENT STRING SEMI imports sigs EOF, $]
-// [187, mbti_prime → • mbti, $]
+// [128, record_decl_constr → nonempty_list(attribute) ASYNC FN loption(type_params_with_constraints) option(method_self_type_coloncolon) • lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, RBRACE]
+// [188, lident → • LIDENT, LPAREN]
 
 ///|
-fn yy_state_0(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_255(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_mbti => Shift(yy_state_1)
-    T_LIDENT => Shift(yy_state_2)
+    T_LIDENT => Shift(yy_state_36)
+    NT_lident => Shift(yy_state_256)
     _ => Error
   }
 }
 
-// [187, mbti_prime → mbti •, $]
+// [128, record_decl_constr → nonempty_list(attribute) ASYNC FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident • LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, RBRACE]
 
 ///|
-fn yy_state_1(_lookahead : YYSymbol) -> YYDecision {
-  Accept
+fn yy_state_256(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_LPAREN => Shift(yy_state_257)
+    _ => Error
+  }
 }
 
-// [0, mbti → LIDENT • STRING imports sigs EOF, $]
-// [1, mbti → LIDENT • STRING SEMI imports sigs EOF, $]
+// [128, record_decl_constr → nonempty_list(attribute) ASYNC FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN • separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, RBRACE]
+// [146, simple_type → • simple_type QUESTION, RPAREN / COMMA / QUESTION]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, RPAREN / COMMA / QUESTION]
+// [148, simple_type → • LPAREN type_ RPAREN, RPAREN / COMMA / QUESTION]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, RPAREN / COMMA / QUESTION]
+// [150, simple_type → • AMPER qualified_uident_, RPAREN / COMMA / QUESTION]
+// [151, simple_type → • UNDERSCORE, RPAREN / COMMA / QUESTION]
+// [152, type_ → • simple_type, RPAREN / COMMA]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [168, parameter → • type_, RPAREN / COMMA]
+// [169, parameter → • post_label COLON type_, RPAREN / COMMA]
+// [170, parameter → • label QUESTION COLON type_, RPAREN / COMMA]
+// [185, qualified_uident_ → • UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
+// [189, label → • LIDENT, QUESTION]
+// [190, post_label → • POST_LABEL, COLON]
+// [197, separated_list(COMMA,parameter) → •, RPAREN]
+// [198, separated_list(COMMA,parameter) → • separated_nonempty_list(COMMA,parameter), RPAREN]
+// [231, separated_nonempty_list(COMMA,parameter) → • parameter, RPAREN]
+// [232, separated_nonempty_list(COMMA,parameter) → • parameter COMMA separated_nonempty_list(COMMA,parameter), RPAREN]
 
 ///|
-fn yy_state_2(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_257(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_STRING => Shift(yy_state_3)
+    NT_parameter => Shift(yy_state_56)
+    T_POST_LABEL => Shift(yy_state_59)
+    T_LIDENT => Shift(yy_state_60)
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    NT_label => Shift(yy_state_64)
+    T_ASYNC => Shift(yy_state_68)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_104)
+    NT_post_label => Shift(yy_state_120)
+    NT_type_ => Shift(yy_state_123)
+    NT_separated_nonempty_list_COMMA_parameter_ => Shift(yy_state_124)
+    NT_separated_list_COMMA_parameter_ => Shift(yy_state_258)
+    T_RPAREN => Reduce(0, NT_separated_list_COMMA_parameter_, yy_action_227)
     _ => Error
   }
 }
 
-// [0, mbti → LIDENT STRING • imports sigs EOF, $]
-// [1, mbti → LIDENT STRING • SEMI imports sigs EOF, $]
-// [2, imports → •, ATTRIBUTE / EOF / PUB / PRIV / EXTERN / STRUCT / ENUM / TRAIT / IMPL / TYPEALIAS / TRAITALIAS / FNALIAS / FN / LET / CONST / TYPE / SUBERROR]
-// [3, imports → • IMPORT LPAREN separated_nonempty_list(SEMI,package_import) RPAREN SEMI, ATTRIBUTE / EOF / PUB / PRIV / EXTERN / STRUCT / ENUM / TRAIT / IMPL / TYPEALIAS / TRAITALIAS / FNALIAS / FN / LET / CONST / TYPE / SUBERROR]
+// [128, record_decl_constr → nonempty_list(attribute) ASYNC FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) • RPAREN THIN_ARROW return_type, RBRACE]
 
 ///|
-fn yy_state_3(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_258(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_IMPORT => Shift(yy_state_4)
-    T_SEMI => Shift(yy_state_15)
-    NT_imports => Shift(yy_state_380)
-    T_ATTRIBUTE
-    | T_EOF
-    | T_PUB
-    | T_PRIV
-    | T_EXTERN
-    | T_STRUCT
-    | T_ENUM
-    | T_TRAIT
-    | T_IMPL
-    | T_TYPEALIAS
-    | T_TRAITALIAS
-    | T_FNALIAS
-    | T_FN
-    | T_LET
-    | T_CONST
-    | T_TYPE
-    | T_SUBERROR => Reduce(0, NT_imports, yy_action_205)
+    T_RPAREN => Shift(yy_state_259)
     _ => Error
   }
 }
 
-// [3, imports → IMPORT • LPAREN separated_nonempty_list(SEMI,package_import) RPAREN SEMI, ATTRIBUTE / EOF / PUB / PRIV / EXTERN / STRUCT / ENUM / TRAIT / IMPL / TYPEALIAS / TRAITALIAS / FNALIAS / FN / LET / CONST / TYPE / SUBERROR]
+// [128, record_decl_constr → nonempty_list(attribute) ASYNC FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN • THIN_ARROW return_type, RBRACE]
 
 ///|
-fn yy_state_4(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_259(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LPAREN => Shift(yy_state_5)
+    T_THIN_ARROW => Shift(yy_state_260)
     _ => Error
   }
 }
 
-// [3, imports → IMPORT LPAREN • separated_nonempty_list(SEMI,package_import) RPAREN SEMI, ATTRIBUTE / EOF / PUB / PRIV / EXTERN / STRUCT / ENUM / TRAIT / IMPL / TYPEALIAS / TRAITALIAS / FNALIAS / FN / LET / CONST / TYPE / SUBERROR]
-// [4, package_import → • STRING, RPAREN / SEMI]
-// [5, package_import → • STRING AS LIDENT, RPAREN / SEMI]
-// [133, separated_nonempty_list(SEMI,package_import) → • package_import, RPAREN]
-// [134, separated_nonempty_list(SEMI,package_import) → • package_import SEMI separated_nonempty_list(SEMI,package_import), RPAREN]
+// [128, record_decl_constr → nonempty_list(attribute) ASYNC FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW • return_type, RBRACE]
+// [146, simple_type → • simple_type QUESTION, RAISE / QUESTION / RBRACE]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, RAISE / QUESTION / RBRACE]
+// [148, simple_type → • LPAREN type_ RPAREN, RAISE / QUESTION / RBRACE]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, RAISE / QUESTION / RBRACE]
+// [150, simple_type → • AMPER qualified_uident_, RAISE / QUESTION / RBRACE]
+// [151, simple_type → • UNDERSCORE, RAISE / QUESTION / RBRACE]
+// [152, type_ → • simple_type, RBRACE]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RBRACE]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RBRACE]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RBRACE]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RBRACE]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, RBRACE]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, RBRACE]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, RBRACE]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, RBRACE]
+// [161, return_type → • type_, RBRACE]
+// [162, return_type → • simple_type RAISE, RBRACE]
+// [163, return_type → • simple_type RAISE error_type, RBRACE]
+// [164, return_type → • simple_type RAISE QUESTION, RBRACE]
+// [185, qualified_uident_ → • UIDENT, RAISE / QUESTION / LBRACKET / RBRACE]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, RAISE / QUESTION / LBRACKET / RBRACE]
 
 ///|
-fn yy_state_5(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_260(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_package_import => Shift(yy_state_6)
-    T_STRING => Shift(yy_state_9)
-    NT_separated_nonempty_list_SEMI_package_import_ => Shift(yy_state_12)
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    NT_type_ => Shift(yy_state_72)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_86)
+    NT_return_type => Shift(yy_state_261)
+    _ => Error
+  }
+}
+
+// [128, record_decl_constr → nonempty_list(attribute) ASYNC FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type •, RBRACE]
+
+///|
+fn yy_state_261(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(11, NT_record_decl_constr, yy_action_126)
+}
+
+// [125, record_decl_field → nonempty_list(attribute) boption(MUTABLE) • LIDENT COLON type_, SEMI / RBRACE]
+
+///|
+fn yy_state_262(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_LIDENT => Shift(yy_state_263)
+    _ => Error
+  }
+}
+
+// [125, record_decl_field → nonempty_list(attribute) boption(MUTABLE) LIDENT • COLON type_, SEMI / RBRACE]
+
+///|
+fn yy_state_263(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_COLON => Shift(yy_state_264)
+    _ => Error
+  }
+}
+
+// [125, record_decl_field → nonempty_list(attribute) boption(MUTABLE) LIDENT COLON • type_, SEMI / RBRACE]
+// [146, simple_type → • simple_type QUESTION, QUESTION / SEMI / RBRACE]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, QUESTION / SEMI / RBRACE]
+// [148, simple_type → • LPAREN type_ RPAREN, QUESTION / SEMI / RBRACE]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, QUESTION / SEMI / RBRACE]
+// [150, simple_type → • AMPER qualified_uident_, QUESTION / SEMI / RBRACE]
+// [151, simple_type → • UNDERSCORE, QUESTION / SEMI / RBRACE]
+// [152, type_ → • simple_type, SEMI / RBRACE]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, SEMI / RBRACE]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, SEMI / RBRACE]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, SEMI / RBRACE]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, SEMI / RBRACE]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, SEMI / RBRACE]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, SEMI / RBRACE]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, SEMI / RBRACE]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, SEMI / RBRACE]
+// [185, qualified_uident_ → • UIDENT, QUESTION / SEMI / LBRACKET / RBRACE]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, QUESTION / SEMI / LBRACKET / RBRACE]
+
+///|
+fn yy_state_264(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_104)
+    NT_type_ => Shift(yy_state_265)
+    _ => Error
+  }
+}
+
+// [125, record_decl_field → nonempty_list(attribute) boption(MUTABLE) LIDENT COLON type_ •, SEMI / RBRACE]
+
+///|
+fn yy_state_265(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(5, NT_record_decl_field, yy_action_125)
+}
+
+// [124, record_decl_field → boption(MUTABLE) • LIDENT COLON type_, SEMI / RBRACE]
+
+///|
+fn yy_state_266(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_LIDENT => Shift(yy_state_267)
+    _ => Error
+  }
+}
+
+// [124, record_decl_field → boption(MUTABLE) LIDENT • COLON type_, SEMI / RBRACE]
+
+///|
+fn yy_state_267(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_COLON => Shift(yy_state_268)
+    _ => Error
+  }
+}
+
+// [124, record_decl_field → boption(MUTABLE) LIDENT COLON • type_, SEMI / RBRACE]
+// [146, simple_type → • simple_type QUESTION, QUESTION / SEMI / RBRACE]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, QUESTION / SEMI / RBRACE]
+// [148, simple_type → • LPAREN type_ RPAREN, QUESTION / SEMI / RBRACE]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, QUESTION / SEMI / RBRACE]
+// [150, simple_type → • AMPER qualified_uident_, QUESTION / SEMI / RBRACE]
+// [151, simple_type → • UNDERSCORE, QUESTION / SEMI / RBRACE]
+// [152, type_ → • simple_type, SEMI / RBRACE]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, SEMI / RBRACE]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, SEMI / RBRACE]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, SEMI / RBRACE]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, SEMI / RBRACE]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, SEMI / RBRACE]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, SEMI / RBRACE]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, SEMI / RBRACE]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, SEMI / RBRACE]
+// [185, qualified_uident_ → • UIDENT, QUESTION / SEMI / LBRACKET / RBRACE]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, QUESTION / SEMI / LBRACKET / RBRACE]
+
+///|
+fn yy_state_268(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_104)
+    NT_type_ => Shift(yy_state_269)
+    _ => Error
+  }
+}
+
+// [124, record_decl_field → boption(MUTABLE) LIDENT COLON type_ •, SEMI / RBRACE]
+
+///|
+fn yy_state_269(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(4, NT_record_decl_field, yy_action_124)
+}
+
+// [132, record_decl_body → record_decl_body_nonempty •, RBRACE]
+
+///|
+fn yy_state_270(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_record_decl_body, yy_action_123)
+}
+
+// [131, record_decl_body → record_decl_constr •, RBRACE]
+
+///|
+fn yy_state_271(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_record_decl_body, yy_action_122)
+}
+
+// [56, type_sig → STRUCT type_decl_name_with_params LBRACE record_decl_body • RBRACE, EOF / SEMI]
+
+///|
+fn yy_state_272(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_RBRACE => Shift(yy_state_273)
+    _ => Error
+  }
+}
+
+// [56, type_sig → STRUCT type_decl_name_with_params LBRACE record_decl_body RBRACE •, EOF / SEMI]
+
+///|
+fn yy_state_273(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(5, NT_type_sig, yy_action_121)
+}
+
+// [44, type_sig → SUBERROR • uident option(type_), EOF / SEMI]
+// [50, type_sig → SUBERROR • uident LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [187, uident → • UIDENT, UIDENT / EOF / ASYNC / LPAREN / SEMI / UNDERSCORE / LBRACE / AMPER / PACKAGE_NAME]
+
+///|
+fn yy_state_274(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_UIDENT => Shift(yy_state_23)
+    NT_uident => Shift(yy_state_275)
+    _ => Error
+  }
+}
+
+// [44, type_sig → SUBERROR uident • option(type_), EOF / SEMI]
+// [50, type_sig → SUBERROR uident • LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [146, simple_type → • simple_type QUESTION, EOF / QUESTION / SEMI]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EOF / QUESTION / SEMI]
+// [148, simple_type → • LPAREN type_ RPAREN, EOF / QUESTION / SEMI]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, EOF / QUESTION / SEMI]
+// [150, simple_type → • AMPER qualified_uident_, EOF / QUESTION / SEMI]
+// [151, simple_type → • UNDERSCORE, EOF / QUESTION / SEMI]
+// [152, type_ → • simple_type, EOF / SEMI]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [185, qualified_uident_ → • UIDENT, EOF / QUESTION / SEMI / LBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EOF / QUESTION / SEMI / LBRACKET]
+// [201, option(type_) → •, EOF / SEMI]
+// [202, option(type_) → • type_, EOF / SEMI]
+
+///|
+fn yy_state_275(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_104)
+    NT_type_ => Shift(yy_state_276)
+    T_LBRACE => Shift(yy_state_277)
+    NT_option_type__ => Shift(yy_state_280)
+    T_EOF | T_SEMI => Reduce(0, NT_option_type__, yy_action_120)
+    _ => Error
+  }
+}
+
+// [202, option(type_) → type_ •, EOF / SEMI]
+
+///|
+fn yy_state_276(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_option_type__, yy_action_119)
+}
+
+// [50, type_sig → SUBERROR uident LBRACE • separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [120, enum_constructor → • UIDENT option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) option(eq_tag), SEMI / RBRACE]
+// [121, enum_constructor → • nonempty_list(attribute) UIDENT option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) option(eq_tag), SEMI / RBRACE]
+// [203, separated_list(SEMI,enum_constructor) → •, RBRACE]
+// [204, separated_list(SEMI,enum_constructor) → • separated_nonempty_list(SEMI,enum_constructor), RBRACE]
+// [229, nonempty_list(attribute) → • ATTRIBUTE, UIDENT]
+// [230, nonempty_list(attribute) → • ATTRIBUTE nonempty_list(attribute), UIDENT]
+// [233, separated_nonempty_list(SEMI,enum_constructor) → • enum_constructor, RBRACE]
+// [234, separated_nonempty_list(SEMI,enum_constructor) → • enum_constructor SEMI separated_nonempty_list(SEMI,enum_constructor), RBRACE]
+
+///|
+fn yy_state_277(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_ATTRIBUTE => Shift(yy_state_17)
+    NT_enum_constructor => Shift(yy_state_178)
+    NT_nonempty_list_attribute_ => Shift(yy_state_181)
+    T_UIDENT => Shift(yy_state_199)
+    NT_separated_nonempty_list_SEMI_enum_constructor_ => Shift(yy_state_202)
+    NT_separated_list_SEMI_enum_constructor_ => Shift(yy_state_278)
+    T_RBRACE =>
+      Reduce(0, NT_separated_list_SEMI_enum_constructor_, yy_action_161)
+    _ => Error
+  }
+}
+
+// [50, type_sig → SUBERROR uident LBRACE separated_list(SEMI,enum_constructor) • RBRACE, EOF / SEMI]
+
+///|
+fn yy_state_278(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_RBRACE => Shift(yy_state_279)
+    _ => Error
+  }
+}
+
+// [50, type_sig → SUBERROR uident LBRACE separated_list(SEMI,enum_constructor) RBRACE •, EOF / SEMI]
+
+///|
+fn yy_state_279(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(5, NT_type_sig, yy_action_118)
+}
+
+// [44, type_sig → SUBERROR uident option(type_) •, EOF / SEMI]
+
+///|
+fn yy_state_280(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(3, NT_type_sig, yy_action_117)
+}
+
+// [38, type_sig → TYPE • type_decl_name_with_params, EOF / SEMI]
+// [100, alias_sig → TYPE • type_decl_name_with_params EQUAL type_, EOF / SEMI]
+// [145, type_decl_name_with_params → • uident optional_type_params_no_constraints, EOF / EQUAL / SEMI]
+// [187, uident → • UIDENT, EOF / EQUAL / SEMI / LBRACKET]
+
+///|
+fn yy_state_281(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_UIDENT => Shift(yy_state_23)
+    NT_uident => Shift(yy_state_164)
+    NT_type_decl_name_with_params => Shift(yy_state_282)
+    _ => Error
+  }
+}
+
+// [38, type_sig → TYPE type_decl_name_with_params •, EOF / SEMI]
+// [100, alias_sig → TYPE type_decl_name_with_params • EQUAL type_, EOF / SEMI]
+
+///|
+fn yy_state_282(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_EQUAL => Shift(yy_state_283)
+    T_EOF | T_SEMI => Reduce(2, NT_type_sig, yy_action_116)
+    _ => Error
+  }
+}
+
+// [100, alias_sig → TYPE type_decl_name_with_params EQUAL • type_, EOF / SEMI]
+// [146, simple_type → • simple_type QUESTION, EOF / QUESTION / SEMI]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EOF / QUESTION / SEMI]
+// [148, simple_type → • LPAREN type_ RPAREN, EOF / QUESTION / SEMI]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, EOF / QUESTION / SEMI]
+// [150, simple_type → • AMPER qualified_uident_, EOF / QUESTION / SEMI]
+// [151, simple_type → • UNDERSCORE, EOF / QUESTION / SEMI]
+// [152, type_ → • simple_type, EOF / SEMI]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [185, qualified_uident_ → • UIDENT, EOF / QUESTION / SEMI / LBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EOF / QUESTION / SEMI / LBRACKET]
+
+///|
+fn yy_state_283(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_104)
+    NT_type_ => Shift(yy_state_284)
+    _ => Error
+  }
+}
+
+// [100, alias_sig → TYPE type_decl_name_with_params EQUAL type_ •, EOF / SEMI]
+
+///|
+fn yy_state_284(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(4, NT_alias_sig, yy_action_115)
+}
+
+// [33, func_sig → FN • loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [138, type_params_with_constraints → • LBRACKET separated_list(COMMA,type_param_with_constraints) RBRACKET, LIDENT / UIDENT / AMPER]
+// [193, loption(type_params_with_constraints) → •, LIDENT / UIDENT / AMPER]
+// [194, loption(type_params_with_constraints) → • type_params_with_constraints, LIDENT / UIDENT / AMPER]
+
+///|
+fn yy_state_285(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_LBRACKET => Shift(yy_state_142)
+    NT_type_params_with_constraints => Shift(yy_state_217)
+    NT_loption_type_params_with_constraints_ => Shift(yy_state_286)
+    T_LIDENT | T_UIDENT | T_AMPER =>
+      Reduce(0, NT_loption_type_params_with_constraints_, yy_action_135)
+    _ => Error
+  }
+}
+
+// [28, method_self_type_coloncolon → • UIDENT COLONCOLON, LIDENT]
+// [29, method_self_type_coloncolon → • AMPER UIDENT COLONCOLON, LIDENT]
+// [33, func_sig → FN loption(type_params_with_constraints) • option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [195, option(method_self_type_coloncolon) → •, LIDENT]
+// [196, option(method_self_type_coloncolon) → • method_self_type_coloncolon, LIDENT]
+
+///|
+fn yy_state_286(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    NT_method_self_type_coloncolon => Shift(yy_state_219)
+    T_AMPER => Shift(yy_state_227)
+    T_UIDENT => Shift(yy_state_230)
+    NT_option_method_self_type_coloncolon_ => Shift(yy_state_287)
+    T_LIDENT => Reduce(0, NT_option_method_self_type_coloncolon_, yy_action_133)
+    _ => Error
+  }
+}
+
+// [33, func_sig → FN loption(type_params_with_constraints) option(method_self_type_coloncolon) • lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [188, lident → • LIDENT, LPAREN]
+
+///|
+fn yy_state_287(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_LIDENT => Shift(yy_state_36)
+    NT_lident => Shift(yy_state_288)
+    _ => Error
+  }
+}
+
+// [33, func_sig → FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident • LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, EOF / SEMI]
+
+///|
+fn yy_state_288(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_LPAREN => Shift(yy_state_289)
+    _ => Error
+  }
+}
+
+// [33, func_sig → FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN • separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [146, simple_type → • simple_type QUESTION, RPAREN / COMMA / QUESTION]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, RPAREN / COMMA / QUESTION]
+// [148, simple_type → • LPAREN type_ RPAREN, RPAREN / COMMA / QUESTION]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, RPAREN / COMMA / QUESTION]
+// [150, simple_type → • AMPER qualified_uident_, RPAREN / COMMA / QUESTION]
+// [151, simple_type → • UNDERSCORE, RPAREN / COMMA / QUESTION]
+// [152, type_ → • simple_type, RPAREN / COMMA]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [168, parameter → • type_, RPAREN / COMMA]
+// [169, parameter → • post_label COLON type_, RPAREN / COMMA]
+// [170, parameter → • label QUESTION COLON type_, RPAREN / COMMA]
+// [185, qualified_uident_ → • UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
+// [189, label → • LIDENT, QUESTION]
+// [190, post_label → • POST_LABEL, COLON]
+// [197, separated_list(COMMA,parameter) → •, RPAREN]
+// [198, separated_list(COMMA,parameter) → • separated_nonempty_list(COMMA,parameter), RPAREN]
+// [231, separated_nonempty_list(COMMA,parameter) → • parameter, RPAREN]
+// [232, separated_nonempty_list(COMMA,parameter) → • parameter COMMA separated_nonempty_list(COMMA,parameter), RPAREN]
+
+///|
+fn yy_state_289(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    NT_parameter => Shift(yy_state_56)
+    T_POST_LABEL => Shift(yy_state_59)
+    T_LIDENT => Shift(yy_state_60)
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    NT_label => Shift(yy_state_64)
+    T_ASYNC => Shift(yy_state_68)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_104)
+    NT_post_label => Shift(yy_state_120)
+    NT_type_ => Shift(yy_state_123)
+    NT_separated_nonempty_list_COMMA_parameter_ => Shift(yy_state_124)
+    NT_separated_list_COMMA_parameter_ => Shift(yy_state_290)
+    T_RPAREN => Reduce(0, NT_separated_list_COMMA_parameter_, yy_action_227)
+    _ => Error
+  }
+}
+
+// [33, func_sig → FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) • RPAREN THIN_ARROW return_type, EOF / SEMI]
+
+///|
+fn yy_state_290(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_RPAREN => Shift(yy_state_291)
     _ => Error
   }
 }
 
-// [133, separated_nonempty_list(SEMI,package_import) → package_import •, RPAREN]
-// [134, separated_nonempty_list(SEMI,package_import) → package_import • SEMI separated_nonempty_list(SEMI,package_import), RPAREN]
+// [33, func_sig → FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN • THIN_ARROW return_type, EOF / SEMI]
 
 ///|
-fn yy_state_6(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_291(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_SEMI => Shift(yy_state_7)
-    T_RPAREN =>
-      Reduce(1, NT_separated_nonempty_list_SEMI_package_import_, yy_action_204)
+    T_THIN_ARROW => Shift(yy_state_292)
     _ => Error
   }
 }
 
-// [4, package_import → • STRING, RPAREN / SEMI]
-// [5, package_import → • STRING AS LIDENT, RPAREN / SEMI]
-// [133, separated_nonempty_list(SEMI,package_import) → • package_import, RPAREN]
-// [134, separated_nonempty_list(SEMI,package_import) → • package_import SEMI separated_nonempty_list(SEMI,package_import), RPAREN]
-// [134, separated_nonempty_list(SEMI,package_import) → package_import SEMI • separated_nonempty_list(SEMI,package_import), RPAREN]
+// [33, func_sig → FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW • return_type, EOF / SEMI]
+// [146, simple_type → • simple_type QUESTION, EOF / RAISE / QUESTION / SEMI]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EOF / RAISE / QUESTION / SEMI]
+// [148, simple_type → • LPAREN type_ RPAREN, EOF / RAISE / QUESTION / SEMI]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, EOF / RAISE / QUESTION / SEMI]
+// [150, simple_type → • AMPER qualified_uident_, EOF / RAISE / QUESTION / SEMI]
+// [151, simple_type → • UNDERSCORE, EOF / RAISE / QUESTION / SEMI]
+// [152, type_ → • simple_type, EOF / SEMI]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [161, return_type → • type_, EOF / SEMI]
+// [162, return_type → • simple_type RAISE, EOF / SEMI]
+// [163, return_type → • simple_type RAISE error_type, EOF / SEMI]
+// [164, return_type → • simple_type RAISE QUESTION, EOF / SEMI]
+// [185, qualified_uident_ → • UIDENT, EOF / RAISE / QUESTION / SEMI / LBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EOF / RAISE / QUESTION / SEMI / LBRACKET]
 
 ///|
-fn yy_state_7(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_292(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_package_import => Shift(yy_state_6)
-    NT_separated_nonempty_list_SEMI_package_import_ => Shift(yy_state_8)
-    T_STRING => Shift(yy_state_9)
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    NT_type_ => Shift(yy_state_72)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_86)
+    NT_return_type => Shift(yy_state_293)
     _ => Error
   }
 }
 
-// [134, separated_nonempty_list(SEMI,package_import) → package_import SEMI separated_nonempty_list(SEMI,package_import) •, RPAREN]
+// [33, func_sig → FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type •, EOF / SEMI]
 
 ///|
-fn yy_state_8(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(
-    3,
-    NT_separated_nonempty_list_SEMI_package_import_,
-    yy_action_203,
-  )
+fn yy_state_293(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(9, NT_func_sig, yy_action_114)
 }
 
-// [4, package_import → STRING •, RPAREN / SEMI]
-// [5, package_import → STRING • AS LIDENT, RPAREN / SEMI]
+// [32, func_sig → ASYNC • FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, EOF / SEMI]
 
 ///|
-fn yy_state_9(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_294(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_AS => Shift(yy_state_10)
-    T_RPAREN | T_SEMI => Reduce(1, NT_package_import, yy_action_202)
+    T_FN => Shift(yy_state_295)
     _ => Error
   }
 }
 
-// [5, package_import → STRING AS • LIDENT, RPAREN / SEMI]
+// [32, func_sig → ASYNC FN • loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [138, type_params_with_constraints → • LBRACKET separated_list(COMMA,type_param_with_constraints) RBRACKET, LIDENT / UIDENT / AMPER]
+// [193, loption(type_params_with_constraints) → •, LIDENT / UIDENT / AMPER]
+// [194, loption(type_params_with_constraints) → • type_params_with_constraints, LIDENT / UIDENT / AMPER]
 
 ///|
-fn yy_state_10(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_295(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LIDENT => Shift(yy_state_11)
+    T_LBRACKET => Shift(yy_state_142)
+    NT_type_params_with_constraints => Shift(yy_state_217)
+    NT_loption_type_params_with_constraints_ => Shift(yy_state_296)
+    T_LIDENT | T_UIDENT | T_AMPER =>
+      Reduce(0, NT_loption_type_params_with_constraints_, yy_action_135)
     _ => Error
   }
 }
 
-// [5, package_import → STRING AS LIDENT •, RPAREN / SEMI]
+// [28, method_self_type_coloncolon → • UIDENT COLONCOLON, LIDENT]
+// [29, method_self_type_coloncolon → • AMPER UIDENT COLONCOLON, LIDENT]
+// [32, func_sig → ASYNC FN loption(type_params_with_constraints) • option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [195, option(method_self_type_coloncolon) → •, LIDENT]
+// [196, option(method_self_type_coloncolon) → • method_self_type_coloncolon, LIDENT]
 
 ///|
-fn yy_state_11(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_package_import, yy_action_201)
+fn yy_state_296(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    NT_method_self_type_coloncolon => Shift(yy_state_219)
+    T_AMPER => Shift(yy_state_227)
+    T_UIDENT => Shift(yy_state_230)
+    NT_option_method_self_type_coloncolon_ => Shift(yy_state_297)
+    T_LIDENT => Reduce(0, NT_option_method_self_type_coloncolon_, yy_action_133)
+    _ => Error
+  }
 }
 
-// [3, imports → IMPORT LPAREN separated_nonempty_list(SEMI,package_import) • RPAREN SEMI, ATTRIBUTE / EOF / PUB / PRIV / EXTERN / STRUCT / ENUM / TRAIT / IMPL / TYPEALIAS / TRAITALIAS / FNALIAS / FN / LET / CONST / TYPE / SUBERROR]
+// [32, func_sig → ASYNC FN loption(type_params_with_constraints) option(method_self_type_coloncolon) • lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [188, lident → • LIDENT, LPAREN]
 
 ///|
-fn yy_state_12(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_297(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RPAREN => Shift(yy_state_13)
+    T_LIDENT => Shift(yy_state_36)
+    NT_lident => Shift(yy_state_298)
     _ => Error
   }
 }
 
-// [3, imports → IMPORT LPAREN separated_nonempty_list(SEMI,package_import) RPAREN • SEMI, ATTRIBUTE / EOF / PUB / PRIV / EXTERN / STRUCT / ENUM / TRAIT / IMPL / TYPEALIAS / TRAITALIAS / FNALIAS / FN / LET / CONST / TYPE / SUBERROR]
+// [32, func_sig → ASYNC FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident • LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, EOF / SEMI]
 
 ///|
-fn yy_state_13(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_298(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_SEMI => Shift(yy_state_14)
+    T_LPAREN => Shift(yy_state_299)
     _ => Error
   }
 }
 
-// [3, imports → IMPORT LPAREN separated_nonempty_list(SEMI,package_import) RPAREN SEMI •, ATTRIBUTE / EOF / PUB / PRIV / EXTERN / STRUCT / ENUM / TRAIT / IMPL / TYPEALIAS / TRAITALIAS / FNALIAS / FN / LET / CONST / TYPE / SUBERROR]
+// [32, func_sig → ASYNC FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN • separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [146, simple_type → • simple_type QUESTION, RPAREN / COMMA / QUESTION]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, RPAREN / COMMA / QUESTION]
+// [148, simple_type → • LPAREN type_ RPAREN, RPAREN / COMMA / QUESTION]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, RPAREN / COMMA / QUESTION]
+// [150, simple_type → • AMPER qualified_uident_, RPAREN / COMMA / QUESTION]
+// [151, simple_type → • UNDERSCORE, RPAREN / COMMA / QUESTION]
+// [152, type_ → • simple_type, RPAREN / COMMA]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [168, parameter → • type_, RPAREN / COMMA]
+// [169, parameter → • post_label COLON type_, RPAREN / COMMA]
+// [170, parameter → • label QUESTION COLON type_, RPAREN / COMMA]
+// [185, qualified_uident_ → • UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
+// [189, label → • LIDENT, QUESTION]
+// [190, post_label → • POST_LABEL, COLON]
+// [197, separated_list(COMMA,parameter) → •, RPAREN]
+// [198, separated_list(COMMA,parameter) → • separated_nonempty_list(COMMA,parameter), RPAREN]
+// [231, separated_nonempty_list(COMMA,parameter) → • parameter, RPAREN]
+// [232, separated_nonempty_list(COMMA,parameter) → • parameter COMMA separated_nonempty_list(COMMA,parameter), RPAREN]
 
 ///|
-fn yy_state_14(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(5, NT_imports, yy_action_200)
+fn yy_state_299(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    NT_parameter => Shift(yy_state_56)
+    T_POST_LABEL => Shift(yy_state_59)
+    T_LIDENT => Shift(yy_state_60)
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    NT_label => Shift(yy_state_64)
+    T_ASYNC => Shift(yy_state_68)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_104)
+    NT_post_label => Shift(yy_state_120)
+    NT_type_ => Shift(yy_state_123)
+    NT_separated_nonempty_list_COMMA_parameter_ => Shift(yy_state_124)
+    NT_separated_list_COMMA_parameter_ => Shift(yy_state_300)
+    T_RPAREN => Reduce(0, NT_separated_list_COMMA_parameter_, yy_action_227)
+    _ => Error
+  }
 }
 
-// [1, mbti → LIDENT STRING SEMI • imports sigs EOF, $]
-// [2, imports → •, ATTRIBUTE / EOF / PUB / PRIV / EXTERN / STRUCT / ENUM / TRAIT / IMPL / TYPEALIAS / TRAITALIAS / FNALIAS / FN / LET / CONST / TYPE / SUBERROR]
-// [3, imports → • IMPORT LPAREN separated_nonempty_list(SEMI,package_import) RPAREN SEMI, ATTRIBUTE / EOF / PUB / PRIV / EXTERN / STRUCT / ENUM / TRAIT / IMPL / TYPEALIAS / TRAITALIAS / FNALIAS / FN / LET / CONST / TYPE / SUBERROR]
+// [32, func_sig → ASYNC FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) • RPAREN THIN_ARROW return_type, EOF / SEMI]
 
 ///|
-fn yy_state_15(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_300(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_IMPORT => Shift(yy_state_4)
-    NT_imports => Shift(yy_state_16)
-    T_ATTRIBUTE
-    | T_EOF
-    | T_PUB
-    | T_PRIV
-    | T_EXTERN
-    | T_STRUCT
-    | T_ENUM
-    | T_TRAIT
-    | T_IMPL
-    | T_TYPEALIAS
-    | T_TRAITALIAS
-    | T_FNALIAS
-    | T_FN
-    | T_LET
-    | T_CONST
-    | T_TYPE
-    | T_SUBERROR => Reduce(0, NT_imports, yy_action_205)
+    T_RPAREN => Shift(yy_state_301)
     _ => Error
   }
 }
 
-// [1, mbti → LIDENT STRING SEMI imports • sigs EOF, $]
-// [6, sigs → •, EOF]
-// [7, sigs → • sig_, EOF]
-// [8, sigs → • sig_ SEMI sigs, EOF]
-// [9, sig_ → • func_sig, EOF / SEMI]
-// [10, sig_ → • type_sig, EOF / SEMI]
-// [11, sig_ → • alias_sig, EOF / SEMI]
-// [12, sig_ → • trait_sig, EOF / SEMI]
-// [13, sig_ → • impl_sig, EOF / SEMI]
-// [14, sig_ → • const_sig, EOF / SEMI]
-// [15, sig_ → • value_sig, EOF / SEMI]
-// [16, const_sig → • CONST uident COLON type_ EQUAL constant, EOF / SEMI]
-// [17, value_sig → • LET lident COLON type_, EOF / SEMI]
-// [18, value_sig → • nonempty_list(attribute) LET lident COLON type_, EOF / SEMI]
-// [21, func_sig_no_attr → • FN loption(type_params_with_constraints) method_prefix lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [22, func_sig → • func_sig_no_attr, EOF / SEMI]
-// [23, func_sig → • nonempty_list(ATTRIBUTE) func_sig_no_attr, EOF / SEMI]
-// [25, type_sig → • EXTERN TYPE type_decl_name_with_params, EOF / SEMI]
-// [26, type_sig → • PRIV EXTERN TYPE type_decl_name_with_params, EOF / SEMI]
-// [27, type_sig → • PUB pub_attr EXTERN TYPE type_decl_name_with_params, EOF / SEMI]
-// [28, type_sig → • TYPE type_decl_name_with_params, EOF / SEMI]
-// [29, type_sig → • PRIV TYPE type_decl_name_with_params, EOF / SEMI]
-// [30, type_sig → • PUB pub_attr TYPE type_decl_name_with_params, EOF / SEMI]
-// [31, type_sig → • TYPE type_decl_name_with_params type_, EOF / SEMI]
-// [32, type_sig → • PRIV TYPE type_decl_name_with_params type_, EOF / SEMI]
-// [33, type_sig → • PUB pub_attr TYPE type_decl_name_with_params type_, EOF / SEMI]
-// [34, type_sig → • SUBERROR uident, EOF / SEMI]
-// [35, type_sig → • PRIV SUBERROR uident, EOF / SEMI]
-// [36, type_sig → • PUB pub_attr SUBERROR uident, EOF / SEMI]
-// [37, type_sig → • SUBERROR uident type_, EOF / SEMI]
-// [38, type_sig → • PRIV SUBERROR uident type_, EOF / SEMI]
-// [39, type_sig → • PUB pub_attr SUBERROR uident type_, EOF / SEMI]
-// [40, type_sig → • SUBERROR uident LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
-// [41, type_sig → • PRIV SUBERROR uident LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
-// [42, type_sig → • PUB pub_attr SUBERROR uident LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
-// [43, type_sig → • STRUCT type_decl_name_with_params LBRACE separated_list(SEMI,record_decl_field) RBRACE, EOF / SEMI]
-// [44, type_sig → • PRIV STRUCT type_decl_name_with_params LBRACE separated_list(SEMI,record_decl_field) RBRACE, EOF / SEMI]
-// [45, type_sig → • PUB pub_attr STRUCT type_decl_name_with_params LBRACE separated_list(SEMI,record_decl_field) RBRACE, EOF / SEMI]
-// [46, type_sig → • STRUCT type_decl_name_with_params LPAREN separated_list(COMMA,type_) RPAREN, EOF / SEMI]
-// [47, type_sig → • PRIV STRUCT type_decl_name_with_params LPAREN separated_list(COMMA,type_) RPAREN, EOF / SEMI]
-// [48, type_sig → • PUB pub_attr STRUCT type_decl_name_with_params LPAREN separated_list(COMMA,type_) RPAREN, EOF / SEMI]
-// [49, type_sig → • ENUM type_decl_name_with_params LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
-// [50, type_sig → • PRIV ENUM type_decl_name_with_params LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
-// [51, type_sig → • PUB pub_attr ENUM type_decl_name_with_params LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
-// [52, impl_sig → • IMPL type_params_with_constraints qualified_uident FOR type_, EOF / SEMI]
-// [53, impl_sig → • IMPL qualified_uident FOR type_, EOF / SEMI]
-// [54, impl_sig → • IMPL uident COLONCOLON lident, EOF / SEMI]
-// [55, trait_sig → • TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
-// [56, trait_sig → • PRIV TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
-// [57, trait_sig → • PUB pub_attr TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
-// [58, trait_sig → • TRAIT uident, EOF / SEMI]
-// [59, trait_sig → • PRIV TRAIT uident, EOF / SEMI]
-// [60, trait_sig → • PUB pub_attr TRAIT uident, EOF / SEMI]
-// [61, alias_sig → • TYPEALIAS type_ AS type_decl_name_with_params, EOF / SEMI]
-// [62, alias_sig → • PRIV TYPEALIAS type_ AS type_decl_name_with_params, EOF / SEMI]
-// [63, alias_sig → • PUB pub_attr TYPEALIAS type_ AS type_decl_name_with_params, EOF / SEMI]
-// [64, alias_sig → • TRAITALIAS qualified_uident AS uident, EOF / SEMI]
-// [65, alias_sig → • PRIV TRAITALIAS qualified_uident AS uident, EOF / SEMI]
-// [66, alias_sig → • PUB pub_attr TRAITALIAS qualified_uident AS uident, EOF / SEMI]
-// [67, alias_sig → • FNALIAS qualified_uident COLONCOLON lident, EOF / SEMI]
-// [139, nonempty_list(ATTRIBUTE) → • ATTRIBUTE, FN]
-// [140, nonempty_list(ATTRIBUTE) → • ATTRIBUTE nonempty_list(ATTRIBUTE), FN]
-// [173, nonempty_list(attribute) → • ATTRIBUTE, LET]
-// [174, nonempty_list(attribute) → • ATTRIBUTE nonempty_list(attribute), LET]
-
-///|
-fn yy_state_16(_lookahead : YYSymbol) -> YYDecision {
-  match _lookahead {
-    T_ATTRIBUTE => Shift(yy_state_17)
-    T_FNALIAS => Shift(yy_state_20)
-    T_TRAITALIAS => Shift(yy_state_28)
-    T_TYPEALIAS => Shift(yy_state_33)
-    T_TRAIT => Shift(yy_state_104)
-    T_IMPL => Shift(yy_state_136)
-    T_ENUM => Shift(yy_state_162)
-    T_STRUCT => Shift(yy_state_193)
-    T_SUBERROR => Shift(yy_state_215)
-    T_TYPE => Shift(yy_state_221)
-    T_PUB => Shift(yy_state_224)
-    T_PRIV => Shift(yy_state_270)
-    T_EXTERN => Shift(yy_state_310)
-    NT_nonempty_list_ATTRIBUTE_ => Shift(yy_state_313)
-    T_FN => Shift(yy_state_315)
-    NT_func_sig_no_attr => Shift(yy_state_343)
-    NT_nonempty_list_attribute_ => Shift(yy_state_344)
-    T_LET => Shift(yy_state_349)
-    T_CONST => Shift(yy_state_353)
-    NT_value_sig => Shift(yy_state_368)
-    NT_const_sig => Shift(yy_state_369)
-    NT_impl_sig => Shift(yy_state_370)
-    NT_trait_sig => Shift(yy_state_371)
-    NT_alias_sig => Shift(yy_state_372)
-    NT_type_sig => Shift(yy_state_373)
-    NT_func_sig => Shift(yy_state_374)
-    NT_sig_ => Shift(yy_state_375)
-    NT_sigs => Shift(yy_state_378)
-    T_EOF => Reduce(0, NT_sigs, yy_action_199)
-    _ => Error
-  }
-}
-
-// [139, nonempty_list(ATTRIBUTE) → • ATTRIBUTE, FN]
-// [139, nonempty_list(ATTRIBUTE) → ATTRIBUTE •, FN]
-// [140, nonempty_list(ATTRIBUTE) → • ATTRIBUTE nonempty_list(ATTRIBUTE), FN]
-// [140, nonempty_list(ATTRIBUTE) → ATTRIBUTE • nonempty_list(ATTRIBUTE), FN]
-// [173, nonempty_list(attribute) → • ATTRIBUTE, LET]
-// [173, nonempty_list(attribute) → ATTRIBUTE •, LET]
-// [174, nonempty_list(attribute) → • ATTRIBUTE nonempty_list(attribute), LET]
-// [174, nonempty_list(attribute) → ATTRIBUTE • nonempty_list(attribute), LET]
+// [32, func_sig → ASYNC FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN • THIN_ARROW return_type, EOF / SEMI]
 
 ///|
-fn yy_state_17(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_301(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_ATTRIBUTE => Shift(yy_state_17)
-    NT_nonempty_list_attribute_ => Shift(yy_state_18)
-    NT_nonempty_list_ATTRIBUTE_ => Shift(yy_state_19)
-    T_FN => Reduce(1, NT_nonempty_list_ATTRIBUTE_, yy_action_198)
-    T_LET => Reduce(1, NT_nonempty_list_attribute_, yy_action_197)
+    T_THIN_ARROW => Shift(yy_state_302)
     _ => Error
   }
 }
 
-// [174, nonempty_list(attribute) → ATTRIBUTE nonempty_list(attribute) •, LIDENT / UIDENT / LET / MUTABLE]
+// [32, func_sig → ASYNC FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW • return_type, EOF / SEMI]
+// [146, simple_type → • simple_type QUESTION, EOF / RAISE / QUESTION / SEMI]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EOF / RAISE / QUESTION / SEMI]
+// [148, simple_type → • LPAREN type_ RPAREN, EOF / RAISE / QUESTION / SEMI]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, EOF / RAISE / QUESTION / SEMI]
+// [150, simple_type → • AMPER qualified_uident_, EOF / RAISE / QUESTION / SEMI]
+// [151, simple_type → • UNDERSCORE, EOF / RAISE / QUESTION / SEMI]
+// [152, type_ → • simple_type, EOF / SEMI]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [161, return_type → • type_, EOF / SEMI]
+// [162, return_type → • simple_type RAISE, EOF / SEMI]
+// [163, return_type → • simple_type RAISE error_type, EOF / SEMI]
+// [164, return_type → • simple_type RAISE QUESTION, EOF / SEMI]
+// [185, qualified_uident_ → • UIDENT, EOF / RAISE / QUESTION / SEMI / LBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EOF / RAISE / QUESTION / SEMI / LBRACKET]
 
 ///|
-fn yy_state_18(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_nonempty_list_attribute_, yy_action_195)
+fn yy_state_302(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    NT_type_ => Shift(yy_state_72)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_86)
+    NT_return_type => Shift(yy_state_303)
+    _ => Error
+  }
 }
 
-// [140, nonempty_list(ATTRIBUTE) → ATTRIBUTE nonempty_list(ATTRIBUTE) •, FN]
+// [32, func_sig → ASYNC FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type •, EOF / SEMI]
 
 ///|
-fn yy_state_19(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_nonempty_list_ATTRIBUTE_, yy_action_194)
+fn yy_state_303(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(10, NT_func_sig, yy_action_113)
 }
 
-// [67, alias_sig → FNALIAS • qualified_uident COLONCOLON lident, EOF / SEMI]
-// [125, qualified_uident → • UIDENT, COLONCOLON]
-// [126, qualified_uident → • PACKAGE_NAME DOT_UIDENT, COLONCOLON]
+// [22, value_sig → LET • lident COLON type_, EOF / SEMI]
+// [188, lident → • LIDENT, COLON]
 
 ///|
-fn yy_state_20(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_304(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_PACKAGE_NAME => Shift(yy_state_21)
-    T_UIDENT => Shift(yy_state_23)
-    NT_qualified_uident => Shift(yy_state_24)
+    T_LIDENT => Shift(yy_state_36)
+    NT_lident => Shift(yy_state_305)
     _ => Error
   }
 }
 
-// [126, qualified_uident → PACKAGE_NAME • DOT_UIDENT, COMMA / COLONCOLON / PLUS / RBRACKET / LBRACE / AS / FOR]
+// [22, value_sig → LET lident • COLON type_, EOF / SEMI]
 
 ///|
-fn yy_state_21(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_305(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_DOT_UIDENT => Shift(yy_state_22)
+    T_COLON => Shift(yy_state_306)
     _ => Error
   }
 }
 
-// [126, qualified_uident → PACKAGE_NAME DOT_UIDENT •, COMMA / COLONCOLON / PLUS / RBRACKET / LBRACE / AS / FOR]
+// [22, value_sig → LET lident COLON • type_, EOF / SEMI]
+// [146, simple_type → • simple_type QUESTION, EOF / QUESTION / SEMI]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EOF / QUESTION / SEMI]
+// [148, simple_type → • LPAREN type_ RPAREN, EOF / QUESTION / SEMI]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, EOF / QUESTION / SEMI]
+// [150, simple_type → • AMPER qualified_uident_, EOF / QUESTION / SEMI]
+// [151, simple_type → • UNDERSCORE, EOF / QUESTION / SEMI]
+// [152, type_ → • simple_type, EOF / SEMI]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [185, qualified_uident_ → • UIDENT, EOF / QUESTION / SEMI / LBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EOF / QUESTION / SEMI / LBRACKET]
 
 ///|
-fn yy_state_22(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_qualified_uident, yy_action_193)
+fn yy_state_306(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_104)
+    NT_type_ => Shift(yy_state_307)
+    _ => Error
+  }
 }
 
-// [125, qualified_uident → UIDENT •, COMMA / COLONCOLON / PLUS / RBRACKET / LBRACE / AS / FOR]
+// [22, value_sig → LET lident COLON type_ •, EOF / SEMI]
 
 ///|
-fn yy_state_23(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_qualified_uident, yy_action_192)
-}
-
-// [67, alias_sig → FNALIAS qualified_uident • COLONCOLON lident, EOF / SEMI]
+fn yy_state_307(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(4, NT_value_sig, yy_action_112)
+}
+
+// [19, const_sig → nonempty_list(attribute) • CONST uident COLON type_ EQUAL constant, EOF / SEMI]
+// [20, const_sig → nonempty_list(attribute) • PRIV CONST uident COLON type_ EQUAL constant, EOF / SEMI]
+// [21, const_sig → nonempty_list(attribute) • PUB pub_attr CONST uident COLON type_ EQUAL constant, EOF / SEMI]
+// [25, value_sig → nonempty_list(attribute) • LET lident COLON type_, EOF / SEMI]
+// [26, value_sig → nonempty_list(attribute) • PRIV LET lident COLON type_, EOF / SEMI]
+// [27, value_sig → nonempty_list(attribute) • PUB pub_attr LET lident COLON type_, EOF / SEMI]
+// [34, func_sig → nonempty_list(attribute) • ASYNC FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [35, func_sig → nonempty_list(attribute) • FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [41, type_sig → nonempty_list(attribute) • TYPE type_decl_name_with_params, EOF / SEMI]
+// [42, type_sig → nonempty_list(attribute) • PRIV TYPE type_decl_name_with_params, EOF / SEMI]
+// [43, type_sig → nonempty_list(attribute) • PUB pub_attr TYPE type_decl_name_with_params, EOF / SEMI]
+// [47, type_sig → nonempty_list(attribute) • SUBERROR uident option(type_), EOF / SEMI]
+// [48, type_sig → nonempty_list(attribute) • PRIV SUBERROR uident option(type_), EOF / SEMI]
+// [49, type_sig → nonempty_list(attribute) • PUB pub_attr SUBERROR uident option(type_), EOF / SEMI]
+// [53, type_sig → nonempty_list(attribute) • SUBERROR uident LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [54, type_sig → nonempty_list(attribute) • PRIV SUBERROR uident LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [55, type_sig → nonempty_list(attribute) • PUB pub_attr SUBERROR uident LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [59, type_sig → nonempty_list(attribute) • STRUCT type_decl_name_with_params LBRACE record_decl_body RBRACE, EOF / SEMI]
+// [60, type_sig → nonempty_list(attribute) • PRIV STRUCT type_decl_name_with_params LBRACE record_decl_body RBRACE, EOF / SEMI]
+// [61, type_sig → nonempty_list(attribute) • PUB pub_attr STRUCT type_decl_name_with_params LBRACE record_decl_body RBRACE, EOF / SEMI]
+// [65, type_sig → nonempty_list(attribute) • STRUCT type_decl_name_with_params LPAREN separated_list(COMMA,type_) RPAREN, EOF / SEMI]
+// [66, type_sig → nonempty_list(attribute) • PRIV STRUCT type_decl_name_with_params LPAREN separated_list(COMMA,type_) RPAREN, EOF / SEMI]
+// [67, type_sig → nonempty_list(attribute) • PUB pub_attr STRUCT type_decl_name_with_params LPAREN separated_list(COMMA,type_) RPAREN, EOF / SEMI]
+// [71, type_sig → nonempty_list(attribute) • ENUM type_decl_name_with_params LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [72, type_sig → nonempty_list(attribute) • PRIV ENUM type_decl_name_with_params LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [73, type_sig → nonempty_list(attribute) • PUB pub_attr ENUM type_decl_name_with_params LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [77, impl_sig → nonempty_list(attribute) • IMPL type_params_with_constraints qualified_uident FOR type_, EOF / SEMI]
+// [78, impl_sig → nonempty_list(attribute) • PRIV IMPL type_params_with_constraints qualified_uident FOR type_, EOF / SEMI]
+// [79, impl_sig → nonempty_list(attribute) • PUB pub_attr IMPL type_params_with_constraints qualified_uident FOR type_, EOF / SEMI]
+// [83, impl_sig → nonempty_list(attribute) • IMPL qualified_uident FOR type_, EOF / SEMI]
+// [84, impl_sig → nonempty_list(attribute) • PRIV IMPL qualified_uident FOR type_, EOF / SEMI]
+// [85, impl_sig → nonempty_list(attribute) • PUB pub_attr IMPL qualified_uident FOR type_, EOF / SEMI]
+// [89, trait_sig → nonempty_list(attribute) • TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
+// [90, trait_sig → nonempty_list(attribute) • PRIV TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
+// [91, trait_sig → nonempty_list(attribute) • PUB pub_attr TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
+// [95, trait_sig → nonempty_list(attribute) • TRAIT uident, EOF / SEMI]
+// [96, trait_sig → nonempty_list(attribute) • PRIV TRAIT uident, EOF / SEMI]
+// [97, trait_sig → nonempty_list(attribute) • PUB pub_attr TRAIT uident, EOF / SEMI]
+// [103, alias_sig → nonempty_list(attribute) • TYPE type_decl_name_with_params EQUAL type_, EOF / SEMI]
+// [104, alias_sig → nonempty_list(attribute) • PRIV TYPE type_decl_name_with_params EQUAL type_, EOF / SEMI]
+// [105, alias_sig → nonempty_list(attribute) • PUB pub_attr TYPE type_decl_name_with_params EQUAL type_, EOF / SEMI]
+// [107, alias_sig → nonempty_list(attribute) • FNALIAS uident COLONCOLON lident, EOF / SEMI]
+// [111, alias_sig → nonempty_list(attribute) • USING PACKAGE_NAME LBRACE TYPE uident using_binder RBRACE, EOF / SEMI]
+// [112, alias_sig → nonempty_list(attribute) • PRIV USING PACKAGE_NAME LBRACE TYPE uident using_binder RBRACE, EOF / SEMI]
+// [113, alias_sig → nonempty_list(attribute) • PUB pub_attr USING PACKAGE_NAME LBRACE TYPE uident using_binder RBRACE, EOF / SEMI]
+// [117, alias_sig → nonempty_list(attribute) • USING PACKAGE_NAME LBRACE TRAIT uident using_binder RBRACE, EOF / SEMI]
+// [118, alias_sig → nonempty_list(attribute) • PRIV USING PACKAGE_NAME LBRACE TRAIT uident using_binder RBRACE, EOF / SEMI]
+// [119, alias_sig → nonempty_list(attribute) • PUB pub_attr USING PACKAGE_NAME LBRACE TRAIT uident using_binder RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_24(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_308(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLONCOLON => Shift(yy_state_25)
+    T_USING => Shift(yy_state_309)
+    T_FNALIAS => Shift(yy_state_320)
+    T_TRAIT => Shift(yy_state_324)
+    T_IMPL => Shift(yy_state_330)
+    T_ENUM => Shift(yy_state_338)
+    T_STRUCT => Shift(yy_state_343)
+    T_SUBERROR => Shift(yy_state_351)
+    T_TYPE => Shift(yy_state_357)
+    T_FN => Shift(yy_state_361)
+    T_ASYNC => Shift(yy_state_370)
+    T_LET => Shift(yy_state_380)
+    T_PUB => Shift(yy_state_384)
+    T_PRIV => Shift(yy_state_458)
+    T_CONST => Shift(yy_state_517)
     _ => Error
   }
 }
 
-// [67, alias_sig → FNALIAS qualified_uident COLONCOLON • lident, EOF / SEMI]
-// [130, lident → • LIDENT, EOF / SEMI]
+// [111, alias_sig → nonempty_list(attribute) USING • PACKAGE_NAME LBRACE TYPE uident using_binder RBRACE, EOF / SEMI]
+// [117, alias_sig → nonempty_list(attribute) USING • PACKAGE_NAME LBRACE TRAIT uident using_binder RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_25(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_309(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LIDENT => Shift(yy_state_26)
-    NT_lident => Shift(yy_state_27)
+    T_PACKAGE_NAME => Shift(yy_state_310)
     _ => Error
   }
 }
 
-// [130, lident → LIDENT •, EOF / LPAREN / COLON / SEMI]
+// [111, alias_sig → nonempty_list(attribute) USING PACKAGE_NAME • LBRACE TYPE uident using_binder RBRACE, EOF / SEMI]
+// [117, alias_sig → nonempty_list(attribute) USING PACKAGE_NAME • LBRACE TRAIT uident using_binder RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_26(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_lident, yy_action_191)
+fn yy_state_310(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_LBRACE => Shift(yy_state_311)
+    _ => Error
+  }
 }
 
-// [67, alias_sig → FNALIAS qualified_uident COLONCOLON lident •, EOF / SEMI]
+// [111, alias_sig → nonempty_list(attribute) USING PACKAGE_NAME LBRACE • TYPE uident using_binder RBRACE, EOF / SEMI]
+// [117, alias_sig → nonempty_list(attribute) USING PACKAGE_NAME LBRACE • TRAIT uident using_binder RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_27(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(4, NT_alias_sig, yy_action_190)
+fn yy_state_311(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_TRAIT => Shift(yy_state_312)
+    T_TYPE => Shift(yy_state_316)
+    _ => Error
+  }
 }
 
-// [64, alias_sig → TRAITALIAS • qualified_uident AS uident, EOF / SEMI]
-// [125, qualified_uident → • UIDENT, AS]
-// [126, qualified_uident → • PACKAGE_NAME DOT_UIDENT, AS]
+// [117, alias_sig → nonempty_list(attribute) USING PACKAGE_NAME LBRACE TRAIT • uident using_binder RBRACE, EOF / SEMI]
+// [187, uident → • UIDENT, RBRACE / AS]
 
 ///|
-fn yy_state_28(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_312(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_PACKAGE_NAME => Shift(yy_state_21)
     T_UIDENT => Shift(yy_state_23)
-    NT_qualified_uident => Shift(yy_state_29)
+    NT_uident => Shift(yy_state_313)
     _ => Error
   }
 }
 
-// [64, alias_sig → TRAITALIAS qualified_uident • AS uident, EOF / SEMI]
+// [98, using_binder → •, RBRACE]
+// [99, using_binder → • AS uident, RBRACE]
+// [117, alias_sig → nonempty_list(attribute) USING PACKAGE_NAME LBRACE TRAIT uident • using_binder RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_29(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_313(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_AS => Shift(yy_state_30)
+    T_AS => Shift(yy_state_27)
+    NT_using_binder => Shift(yy_state_314)
+    T_RBRACE => Reduce(0, NT_using_binder, yy_action_243)
     _ => Error
   }
 }
 
-// [64, alias_sig → TRAITALIAS qualified_uident AS • uident, EOF / SEMI]
-// [129, uident → • UIDENT, EOF / SEMI]
+// [117, alias_sig → nonempty_list(attribute) USING PACKAGE_NAME LBRACE TRAIT uident using_binder • RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_30(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_314(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_31)
-    NT_uident => Shift(yy_state_32)
+    T_RBRACE => Shift(yy_state_315)
     _ => Error
   }
 }
 
-// [129, uident → UIDENT •, UIDENT / EOF / ASYNC / LPAREN / COMMA / COLONCOLON / COLON / SEMI / LBRACKET / RBRACKET / UNDERSCORE / LBRACE / AMPER / PACKAGE_NAME]
+// [117, alias_sig → nonempty_list(attribute) USING PACKAGE_NAME LBRACE TRAIT uident using_binder RBRACE •, EOF / SEMI]
 
 ///|
-fn yy_state_31(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_uident, yy_action_189)
+fn yy_state_315(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(8, NT_alias_sig, yy_action_111)
 }
 
-// [64, alias_sig → TRAITALIAS qualified_uident AS uident •, EOF / SEMI]
-
-///|
-fn yy_state_32(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(4, NT_alias_sig, yy_action_188)
-}
-
-// [61, alias_sig → TYPEALIAS • type_ AS type_decl_name_with_params, EOF / SEMI]
-// [84, simple_type → • simple_type QUESTION, QUESTION / AS]
-// [85, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, QUESTION / AS]
-// [86, simple_type → • LPAREN type_ RPAREN, QUESTION / AS]
-// [87, simple_type → • qualified_uident_ optional_type_arguments, QUESTION / AS]
-// [88, simple_type → • AMPER qualified_uident_, QUESTION / AS]
-// [89, simple_type → • UNDERSCORE, QUESTION / AS]
-// [90, type_ → • simple_type, AS]
-// [91, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, AS]
-// [92, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, AS]
-// [93, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, AS]
-// [94, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, AS]
-// [95, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, AS]
-// [96, type_ → • LPAREN RPAREN THIN_ARROW return_type, AS]
-// [97, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, AS]
-// [98, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, AS]
-// [127, qualified_uident_ → • UIDENT, QUESTION / LBRACKET / AS]
-// [128, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, QUESTION / LBRACKET / AS]
+// [111, alias_sig → nonempty_list(attribute) USING PACKAGE_NAME LBRACE TYPE • uident using_binder RBRACE, EOF / SEMI]
+// [187, uident → • UIDENT, RBRACE / AS]
 
 ///|
-fn yy_state_33(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_316(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_PACKAGE_NAME => Shift(yy_state_34)
-    T_UIDENT => Shift(yy_state_36)
-    T_ASYNC => Shift(yy_state_37)
-    T_UNDERSCORE => Shift(yy_state_43)
-    T_AMPER => Shift(yy_state_44)
-    NT_qualified_uident_ => Shift(yy_state_46)
-    T_LPAREN => Shift(yy_state_51)
-    NT_simple_type => Shift(yy_state_73)
-    NT_type_ => Shift(yy_state_89)
+    T_UIDENT => Shift(yy_state_23)
+    NT_uident => Shift(yy_state_317)
     _ => Error
   }
 }
 
-// [128, qualified_uident_ → PACKAGE_NAME • DOT_UIDENT, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / LBRACKET / RBRACKET / RBRACE / AS]
+// [98, using_binder → •, RBRACE]
+// [99, using_binder → • AS uident, RBRACE]
+// [111, alias_sig → nonempty_list(attribute) USING PACKAGE_NAME LBRACE TYPE uident • using_binder RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_34(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_317(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_DOT_UIDENT => Shift(yy_state_35)
+    T_AS => Shift(yy_state_27)
+    NT_using_binder => Shift(yy_state_318)
+    T_RBRACE => Reduce(0, NT_using_binder, yy_action_243)
     _ => Error
   }
 }
 
-// [128, qualified_uident_ → PACKAGE_NAME DOT_UIDENT •, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / LBRACKET / RBRACKET / RBRACE / AS]
+// [111, alias_sig → nonempty_list(attribute) USING PACKAGE_NAME LBRACE TYPE uident using_binder • RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_35(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_qualified_uident_, yy_action_187)
+fn yy_state_318(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_RBRACE => Shift(yy_state_319)
+    _ => Error
+  }
 }
 
-// [127, qualified_uident_ → UIDENT •, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / LBRACKET / RBRACKET / RBRACE / AS]
+// [111, alias_sig → nonempty_list(attribute) USING PACKAGE_NAME LBRACE TYPE uident using_binder RBRACE •, EOF / SEMI]
 
 ///|
-fn yy_state_36(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_qualified_uident_, yy_action_186)
+fn yy_state_319(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(8, NT_alias_sig, yy_action_110)
 }
 
-// [91, type_ → ASYNC • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [92, type_ → ASYNC • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [95, type_ → ASYNC • LPAREN RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [97, type_ → ASYNC • LPAREN type_ RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
+// [107, alias_sig → nonempty_list(attribute) FNALIAS • uident COLONCOLON lident, EOF / SEMI]
+// [187, uident → • UIDENT, COLONCOLON]
 
 ///|
-fn yy_state_37(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_320(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LPAREN => Shift(yy_state_38)
+    T_UIDENT => Shift(yy_state_23)
+    NT_uident => Shift(yy_state_321)
     _ => Error
   }
 }
 
-// [84, simple_type → • simple_type QUESTION, RPAREN / COMMA / QUESTION]
-// [85, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, RPAREN / COMMA / QUESTION]
-// [86, simple_type → • LPAREN type_ RPAREN, RPAREN / COMMA / QUESTION]
-// [87, simple_type → • qualified_uident_ optional_type_arguments, RPAREN / COMMA / QUESTION]
-// [88, simple_type → • AMPER qualified_uident_, RPAREN / COMMA / QUESTION]
-// [89, simple_type → • UNDERSCORE, RPAREN / COMMA / QUESTION]
-// [90, type_ → • simple_type, RPAREN / COMMA]
-// [91, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [91, type_ → ASYNC LPAREN • type_ COMMA RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [92, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [92, type_ → ASYNC LPAREN • type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [93, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [94, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [95, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [95, type_ → ASYNC LPAREN • RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [96, type_ → • LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [97, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [97, type_ → ASYNC LPAREN • type_ RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [98, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [127, qualified_uident_ → • UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
-// [128, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
+// [107, alias_sig → nonempty_list(attribute) FNALIAS uident • COLONCOLON lident, EOF / SEMI]
 
 ///|
-fn yy_state_38(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_321(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_PACKAGE_NAME => Shift(yy_state_34)
-    T_UIDENT => Shift(yy_state_36)
-    T_ASYNC => Shift(yy_state_37)
-    T_RPAREN => Shift(yy_state_39)
-    T_UNDERSCORE => Shift(yy_state_43)
-    T_AMPER => Shift(yy_state_44)
-    NT_qualified_uident_ => Shift(yy_state_46)
-    T_LPAREN => Shift(yy_state_51)
-    NT_simple_type => Shift(yy_state_73)
-    NT_type_ => Shift(yy_state_77)
+    T_COLONCOLON => Shift(yy_state_322)
     _ => Error
   }
 }
 
-// [95, type_ → ASYNC LPAREN RPAREN • THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
+// [107, alias_sig → nonempty_list(attribute) FNALIAS uident COLONCOLON • lident, EOF / SEMI]
+// [188, lident → • LIDENT, EOF / SEMI]
 
 ///|
-fn yy_state_39(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_322(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_THIN_ARROW => Shift(yy_state_40)
+    T_LIDENT => Shift(yy_state_36)
+    NT_lident => Shift(yy_state_323)
     _ => Error
   }
 }
 
-// [84, simple_type → • simple_type QUESTION, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
-// [85, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
-// [86, simple_type → • LPAREN type_ RPAREN, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
-// [87, simple_type → • qualified_uident_ optional_type_arguments, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
-// [88, simple_type → • AMPER qualified_uident_, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
-// [89, simple_type → • UNDERSCORE, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
-// [90, type_ → • simple_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [91, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [92, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [93, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [94, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [95, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [95, type_ → ASYNC LPAREN RPAREN THIN_ARROW • return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [96, type_ → • LPAREN RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [97, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [98, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [99, return_type → • type_, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [100, return_type → • simple_type RAISE, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [101, return_type → • simple_type RAISE error_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [102, return_type → • simple_type RAISE QUESTION, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [127, qualified_uident_ → • UIDENT, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / LBRACKET / RBRACKET / RBRACE / AS]
-// [128, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / LBRACKET / RBRACKET / RBRACE / AS]
+// [107, alias_sig → nonempty_list(attribute) FNALIAS uident COLONCOLON lident •, EOF / SEMI]
 
 ///|
-fn yy_state_40(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_323(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(5, NT_alias_sig, yy_action_109)
+}
+
+// [89, trait_sig → nonempty_list(attribute) TRAIT • uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
+// [95, trait_sig → nonempty_list(attribute) TRAIT • uident, EOF / SEMI]
+// [187, uident → • UIDENT, EOF / COLON / SEMI / LBRACE]
+
+///|
+fn yy_state_324(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_PACKAGE_NAME => Shift(yy_state_34)
-    T_UIDENT => Shift(yy_state_36)
-    T_ASYNC => Shift(yy_state_37)
-    NT_type_ => Shift(yy_state_41)
-    NT_return_type => Shift(yy_state_42)
-    T_UNDERSCORE => Shift(yy_state_43)
-    T_AMPER => Shift(yy_state_44)
-    NT_qualified_uident_ => Shift(yy_state_46)
-    T_LPAREN => Shift(yy_state_51)
-    NT_simple_type => Shift(yy_state_55)
+    T_UIDENT => Shift(yy_state_23)
+    NT_uident => Shift(yy_state_325)
     _ => Error
   }
 }
 
-// [99, return_type → type_ •, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
+// [89, trait_sig → nonempty_list(attribute) TRAIT uident • loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
+// [95, trait_sig → nonempty_list(attribute) TRAIT uident •, EOF / SEMI]
+// [209, loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) → •, LBRACE]
+// [210, loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) → • COLON separated_nonempty_list(PLUS,qualified_uident), LBRACE]
 
 ///|
-fn yy_state_41(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_return_type, yy_action_185)
+fn yy_state_325(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_COLON => Shift(yy_state_40)
+    NT_loption_preceded_COLON_separated_nonempty_list_PLUS_qualified_uident___ =>
+      Shift(yy_state_326)
+    T_LBRACE =>
+      Reduce(
+        0,
+        NT_loption_preceded_COLON_separated_nonempty_list_PLUS_qualified_uident___,
+        yy_action_236,
+      )
+    T_EOF | T_SEMI => Reduce(3, NT_trait_sig, yy_action_108)
+    _ => Error
+  }
 }
 
-// [95, type_ → ASYNC LPAREN RPAREN THIN_ARROW return_type •, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
+// [89, trait_sig → nonempty_list(attribute) TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) • LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_42(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(5, NT_type_, yy_action_184)
+fn yy_state_326(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_LBRACE => Shift(yy_state_327)
+    _ => Error
+  }
 }
 
-// [89, simple_type → UNDERSCORE •, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
+// [36, trait_method_sig → • lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type boption(eq_underscore), SEMI / RBRACE]
+// [37, trait_method_sig → • nonempty_list(attribute) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type boption(eq_underscore), SEMI / RBRACE]
+// [89, trait_sig → nonempty_list(attribute) TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE • separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
+// [188, lident → • LIDENT, LPAREN]
+// [211, separated_nonempty_list(SEMI,trait_method_sig) → • trait_method_sig, RBRACE]
+// [212, separated_nonempty_list(SEMI,trait_method_sig) → • trait_method_sig SEMI separated_nonempty_list(SEMI,trait_method_sig), RBRACE]
+// [229, nonempty_list(attribute) → • ATTRIBUTE, LIDENT]
+// [230, nonempty_list(attribute) → • ATTRIBUTE nonempty_list(attribute), LIDENT]
 
 ///|
-fn yy_state_43(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_simple_type, yy_action_183)
+fn yy_state_327(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_ATTRIBUTE => Shift(yy_state_17)
+    T_LIDENT => Shift(yy_state_36)
+    NT_trait_method_sig => Shift(yy_state_50)
+    NT_nonempty_list_attribute_ => Shift(yy_state_53)
+    NT_lident => Shift(yy_state_132)
+    NT_separated_nonempty_list_SEMI_trait_method_sig_ => Shift(yy_state_328)
+    _ => Error
+  }
 }
 
-// [88, simple_type → AMPER • qualified_uident_, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
-// [127, qualified_uident_ → • UIDENT, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
-// [128, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
+// [89, trait_sig → nonempty_list(attribute) TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) • RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_44(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_328(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_PACKAGE_NAME => Shift(yy_state_34)
-    T_UIDENT => Shift(yy_state_36)
-    NT_qualified_uident_ => Shift(yy_state_45)
+    T_RBRACE => Shift(yy_state_329)
     _ => Error
   }
 }
 
-// [88, simple_type → AMPER qualified_uident_ •, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
+// [89, trait_sig → nonempty_list(attribute) TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE •, EOF / SEMI]
 
 ///|
-fn yy_state_45(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_simple_type, yy_action_182)
+fn yy_state_329(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(7, NT_trait_sig, yy_action_107)
 }
 
-// [87, simple_type → qualified_uident_ • optional_type_arguments, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
-// [104, optional_type_arguments → • LBRACKET separated_nonempty_list(COMMA,type_) RBRACKET, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
-// [105, optional_type_arguments → •, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
-
-///|
-fn yy_state_46(_lookahead : YYSymbol) -> YYDecision {
-  match _lookahead {
-    T_LBRACKET => Shift(yy_state_47)
-    NT_optional_type_arguments => Shift(yy_state_76)
-    T_EOF
-    | T_RAISE
-    | T_EQUAL
-    | T_RPAREN
-    | T_COMMA
-    | T_QUESTION
-    | T_SEMI
-    | T_RBRACKET
-    | T_RBRACE
-    | T_AS => Reduce(0, NT_optional_type_arguments, yy_action_181)
-    _ => Error
-  }
-}
-
-// [84, simple_type → • simple_type QUESTION, COMMA / QUESTION / RBRACKET]
-// [85, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, COMMA / QUESTION / RBRACKET]
-// [86, simple_type → • LPAREN type_ RPAREN, COMMA / QUESTION / RBRACKET]
-// [87, simple_type → • qualified_uident_ optional_type_arguments, COMMA / QUESTION / RBRACKET]
-// [88, simple_type → • AMPER qualified_uident_, COMMA / QUESTION / RBRACKET]
-// [89, simple_type → • UNDERSCORE, COMMA / QUESTION / RBRACKET]
-// [90, type_ → • simple_type, COMMA / RBRACKET]
-// [91, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, COMMA / RBRACKET]
-// [92, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, COMMA / RBRACKET]
-// [93, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, COMMA / RBRACKET]
-// [94, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, COMMA / RBRACKET]
-// [95, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, COMMA / RBRACKET]
-// [96, type_ → • LPAREN RPAREN THIN_ARROW return_type, COMMA / RBRACKET]
-// [97, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, COMMA / RBRACKET]
-// [98, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, COMMA / RBRACKET]
-// [104, optional_type_arguments → LBRACKET • separated_nonempty_list(COMMA,type_) RBRACKET, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
-// [127, qualified_uident_ → • UIDENT, COMMA / QUESTION / LBRACKET / RBRACKET]
-// [128, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, COMMA / QUESTION / LBRACKET / RBRACKET]
-// [171, separated_nonempty_list(COMMA,type_) → • type_, RBRACKET]
-// [172, separated_nonempty_list(COMMA,type_) → • type_ COMMA separated_nonempty_list(COMMA,type_), RBRACKET]
+// [77, impl_sig → nonempty_list(attribute) IMPL • type_params_with_constraints qualified_uident FOR type_, EOF / SEMI]
+// [83, impl_sig → nonempty_list(attribute) IMPL • qualified_uident FOR type_, EOF / SEMI]
+// [138, type_params_with_constraints → • LBRACKET separated_list(COMMA,type_param_with_constraints) RBRACKET, UIDENT / PACKAGE_NAME]
+// [183, qualified_uident → • UIDENT, FOR]
+// [184, qualified_uident → • PACKAGE_NAME DOT_UIDENT, FOR]
 
 ///|
-fn yy_state_47(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_330(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_PACKAGE_NAME => Shift(yy_state_34)
-    T_UIDENT => Shift(yy_state_36)
-    T_ASYNC => Shift(yy_state_37)
-    T_UNDERSCORE => Shift(yy_state_43)
-    T_AMPER => Shift(yy_state_44)
-    NT_qualified_uident_ => Shift(yy_state_46)
-    NT_type_ => Shift(yy_state_48)
-    T_LPAREN => Shift(yy_state_51)
-    NT_simple_type => Shift(yy_state_73)
-    NT_separated_nonempty_list_COMMA_type__ => Shift(yy_state_74)
+    T_PACKAGE_NAME => Shift(yy_state_45)
+    T_UIDENT => Shift(yy_state_47)
+    T_LBRACKET => Shift(yy_state_142)
+    NT_qualified_uident => Shift(yy_state_331)
+    NT_type_params_with_constraints => Shift(yy_state_334)
     _ => Error
   }
 }
 
-// [171, separated_nonempty_list(COMMA,type_) → type_ •, RPAREN / RBRACKET]
-// [172, separated_nonempty_list(COMMA,type_) → type_ • COMMA separated_nonempty_list(COMMA,type_), RPAREN / RBRACKET]
+// [83, impl_sig → nonempty_list(attribute) IMPL qualified_uident • FOR type_, EOF / SEMI]
 
 ///|
-fn yy_state_48(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_331(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COMMA => Shift(yy_state_49)
-    T_RPAREN | T_RBRACKET =>
-      Reduce(1, NT_separated_nonempty_list_COMMA_type__, yy_action_180)
+    T_FOR => Shift(yy_state_332)
     _ => Error
   }
 }
 
-// [84, simple_type → • simple_type QUESTION, RPAREN / COMMA / QUESTION / RBRACKET]
-// [85, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, RPAREN / COMMA / QUESTION / RBRACKET]
-// [86, simple_type → • LPAREN type_ RPAREN, RPAREN / COMMA / QUESTION / RBRACKET]
-// [87, simple_type → • qualified_uident_ optional_type_arguments, RPAREN / COMMA / QUESTION / RBRACKET]
-// [88, simple_type → • AMPER qualified_uident_, RPAREN / COMMA / QUESTION / RBRACKET]
-// [89, simple_type → • UNDERSCORE, RPAREN / COMMA / QUESTION / RBRACKET]
-// [90, type_ → • simple_type, RPAREN / COMMA / RBRACKET]
-// [91, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA / RBRACKET]
-// [92, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA / RBRACKET]
-// [93, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA / RBRACKET]
-// [94, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA / RBRACKET]
-// [95, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA / RBRACKET]
-// [96, type_ → • LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA / RBRACKET]
-// [97, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA / RBRACKET]
-// [98, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA / RBRACKET]
-// [127, qualified_uident_ → • UIDENT, RPAREN / COMMA / QUESTION / LBRACKET / RBRACKET]
-// [128, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, RPAREN / COMMA / QUESTION / LBRACKET / RBRACKET]
-// [171, separated_nonempty_list(COMMA,type_) → • type_, RPAREN / RBRACKET]
-// [172, separated_nonempty_list(COMMA,type_) → • type_ COMMA separated_nonempty_list(COMMA,type_), RPAREN / RBRACKET]
-// [172, separated_nonempty_list(COMMA,type_) → type_ COMMA • separated_nonempty_list(COMMA,type_), RPAREN / RBRACKET]
+// [83, impl_sig → nonempty_list(attribute) IMPL qualified_uident FOR • type_, EOF / SEMI]
+// [146, simple_type → • simple_type QUESTION, EOF / QUESTION / SEMI]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EOF / QUESTION / SEMI]
+// [148, simple_type → • LPAREN type_ RPAREN, EOF / QUESTION / SEMI]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, EOF / QUESTION / SEMI]
+// [150, simple_type → • AMPER qualified_uident_, EOF / QUESTION / SEMI]
+// [151, simple_type → • UNDERSCORE, EOF / QUESTION / SEMI]
+// [152, type_ → • simple_type, EOF / SEMI]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [185, qualified_uident_ → • UIDENT, EOF / QUESTION / SEMI / LBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EOF / QUESTION / SEMI / LBRACKET]
 
 ///|
-fn yy_state_49(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_332(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_PACKAGE_NAME => Shift(yy_state_34)
-    T_UIDENT => Shift(yy_state_36)
-    T_ASYNC => Shift(yy_state_37)
-    T_UNDERSCORE => Shift(yy_state_43)
-    T_AMPER => Shift(yy_state_44)
-    NT_qualified_uident_ => Shift(yy_state_46)
-    NT_type_ => Shift(yy_state_48)
-    NT_separated_nonempty_list_COMMA_type__ => Shift(yy_state_50)
-    T_LPAREN => Shift(yy_state_51)
-    NT_simple_type => Shift(yy_state_73)
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_104)
+    NT_type_ => Shift(yy_state_333)
     _ => Error
   }
 }
 
-// [172, separated_nonempty_list(COMMA,type_) → type_ COMMA separated_nonempty_list(COMMA,type_) •, RPAREN / RBRACKET]
+// [83, impl_sig → nonempty_list(attribute) IMPL qualified_uident FOR type_ •, EOF / SEMI]
 
 ///|
-fn yy_state_50(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_separated_nonempty_list_COMMA_type__, yy_action_179)
-}
-
-// [84, simple_type → • simple_type QUESTION, RPAREN / COMMA / QUESTION]
-// [85, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, RPAREN / COMMA / QUESTION]
-// [85, simple_type → LPAREN • type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
-// [86, simple_type → • LPAREN type_ RPAREN, RPAREN / COMMA / QUESTION]
-// [86, simple_type → LPAREN • type_ RPAREN, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
-// [87, simple_type → • qualified_uident_ optional_type_arguments, RPAREN / COMMA / QUESTION]
-// [88, simple_type → • AMPER qualified_uident_, RPAREN / COMMA / QUESTION]
-// [89, simple_type → • UNDERSCORE, RPAREN / COMMA / QUESTION]
-// [90, type_ → • simple_type, RPAREN / COMMA]
-// [91, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [92, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [93, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [93, type_ → LPAREN • type_ COMMA RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [94, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [94, type_ → LPAREN • type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [95, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [96, type_ → • LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [96, type_ → LPAREN • RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [97, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [98, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [98, type_ → LPAREN • type_ RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [127, qualified_uident_ → • UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
-// [128, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
+fn yy_state_333(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(5, NT_impl_sig, yy_action_106)
+}
+
+// [77, impl_sig → nonempty_list(attribute) IMPL type_params_with_constraints • qualified_uident FOR type_, EOF / SEMI]
+// [183, qualified_uident → • UIDENT, FOR]
+// [184, qualified_uident → • PACKAGE_NAME DOT_UIDENT, FOR]
 
 ///|
-fn yy_state_51(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_334(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_PACKAGE_NAME => Shift(yy_state_34)
-    T_UIDENT => Shift(yy_state_36)
-    T_ASYNC => Shift(yy_state_37)
-    T_UNDERSCORE => Shift(yy_state_43)
-    T_AMPER => Shift(yy_state_44)
-    NT_qualified_uident_ => Shift(yy_state_46)
-    T_LPAREN => Shift(yy_state_51)
-    T_RPAREN => Shift(yy_state_52)
-    NT_type_ => Shift(yy_state_61)
-    NT_simple_type => Shift(yy_state_73)
+    T_PACKAGE_NAME => Shift(yy_state_45)
+    T_UIDENT => Shift(yy_state_47)
+    NT_qualified_uident => Shift(yy_state_335)
     _ => Error
   }
 }
 
-// [96, type_ → LPAREN RPAREN • THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
+// [77, impl_sig → nonempty_list(attribute) IMPL type_params_with_constraints qualified_uident • FOR type_, EOF / SEMI]
 
 ///|
-fn yy_state_52(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_335(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_THIN_ARROW => Shift(yy_state_53)
+    T_FOR => Shift(yy_state_336)
     _ => Error
   }
 }
 
-// [84, simple_type → • simple_type QUESTION, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
-// [85, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
-// [86, simple_type → • LPAREN type_ RPAREN, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
-// [87, simple_type → • qualified_uident_ optional_type_arguments, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
-// [88, simple_type → • AMPER qualified_uident_, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
-// [89, simple_type → • UNDERSCORE, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
-// [90, type_ → • simple_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [91, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [92, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [93, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [94, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [95, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [96, type_ → • LPAREN RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [96, type_ → LPAREN RPAREN THIN_ARROW • return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [97, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [98, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [99, return_type → • type_, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [100, return_type → • simple_type RAISE, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [101, return_type → • simple_type RAISE error_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [102, return_type → • simple_type RAISE QUESTION, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [127, qualified_uident_ → • UIDENT, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / LBRACKET / RBRACKET / RBRACE / AS]
-// [128, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / LBRACKET / RBRACKET / RBRACE / AS]
+// [77, impl_sig → nonempty_list(attribute) IMPL type_params_with_constraints qualified_uident FOR • type_, EOF / SEMI]
+// [146, simple_type → • simple_type QUESTION, EOF / QUESTION / SEMI]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EOF / QUESTION / SEMI]
+// [148, simple_type → • LPAREN type_ RPAREN, EOF / QUESTION / SEMI]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, EOF / QUESTION / SEMI]
+// [150, simple_type → • AMPER qualified_uident_, EOF / QUESTION / SEMI]
+// [151, simple_type → • UNDERSCORE, EOF / QUESTION / SEMI]
+// [152, type_ → • simple_type, EOF / SEMI]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [185, qualified_uident_ → • UIDENT, EOF / QUESTION / SEMI / LBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EOF / QUESTION / SEMI / LBRACKET]
 
 ///|
-fn yy_state_53(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_336(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_PACKAGE_NAME => Shift(yy_state_34)
-    T_UIDENT => Shift(yy_state_36)
-    T_ASYNC => Shift(yy_state_37)
-    NT_type_ => Shift(yy_state_41)
-    T_UNDERSCORE => Shift(yy_state_43)
-    T_AMPER => Shift(yy_state_44)
-    NT_qualified_uident_ => Shift(yy_state_46)
-    T_LPAREN => Shift(yy_state_51)
-    NT_return_type => Shift(yy_state_54)
-    NT_simple_type => Shift(yy_state_55)
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_104)
+    NT_type_ => Shift(yy_state_337)
     _ => Error
   }
 }
 
-// [96, type_ → LPAREN RPAREN THIN_ARROW return_type •, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
+// [77, impl_sig → nonempty_list(attribute) IMPL type_params_with_constraints qualified_uident FOR type_ •, EOF / SEMI]
 
 ///|
-fn yy_state_54(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(4, NT_type_, yy_action_178)
+fn yy_state_337(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(6, NT_impl_sig, yy_action_105)
 }
 
-// [84, simple_type → simple_type • QUESTION, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
-// [90, type_ → simple_type •, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [100, return_type → simple_type • RAISE, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [101, return_type → simple_type • RAISE error_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [102, return_type → simple_type • RAISE QUESTION, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
+// [71, type_sig → nonempty_list(attribute) ENUM • type_decl_name_with_params LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [145, type_decl_name_with_params → • uident optional_type_params_no_constraints, LBRACE]
+// [187, uident → • UIDENT, LBRACKET / LBRACE]
 
 ///|
-fn yy_state_55(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_338(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RAISE => Shift(yy_state_56)
-    T_QUESTION => Shift(yy_state_60)
-    T_EOF
-    | T_EQUAL
-    | T_RPAREN
-    | T_COMMA
-    | T_SEMI
-    | T_RBRACKET
-    | T_RBRACE
-    | T_AS => Reduce(1, NT_type_, yy_action_177)
+    T_UIDENT => Shift(yy_state_23)
+    NT_uident => Shift(yy_state_164)
+    NT_type_decl_name_with_params => Shift(yy_state_339)
     _ => Error
   }
 }
 
-// [100, return_type → simple_type RAISE •, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [101, return_type → simple_type RAISE • error_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [102, return_type → simple_type RAISE • QUESTION, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [103, error_type → • qualified_uident_, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [127, qualified_uident_ → • UIDENT, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [128, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
+// [71, type_sig → nonempty_list(attribute) ENUM type_decl_name_with_params • LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_56(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_339(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_PACKAGE_NAME => Shift(yy_state_34)
-    T_UIDENT => Shift(yy_state_36)
-    NT_qualified_uident_ => Shift(yy_state_57)
-    T_QUESTION => Shift(yy_state_58)
-    NT_error_type => Shift(yy_state_59)
-    T_EOF
-    | T_EQUAL
-    | T_RPAREN
-    | T_COMMA
-    | T_SEMI
-    | T_RBRACKET
-    | T_RBRACE
-    | T_AS => Reduce(2, NT_return_type, yy_action_176)
+    T_LBRACE => Shift(yy_state_340)
     _ => Error
   }
 }
 
-// [103, error_type → qualified_uident_ •, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-
-///|
-fn yy_state_57(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_error_type, yy_action_175)
-}
-
-// [102, return_type → simple_type RAISE QUESTION •, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-
-///|
-fn yy_state_58(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_return_type, yy_action_174)
-}
-
-// [101, return_type → simple_type RAISE error_type •, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-
-///|
-fn yy_state_59(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_return_type, yy_action_173)
-}
-
-// [84, simple_type → simple_type QUESTION •, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
+// [71, type_sig → nonempty_list(attribute) ENUM type_decl_name_with_params LBRACE • separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [120, enum_constructor → • UIDENT option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) option(eq_tag), SEMI / RBRACE]
+// [121, enum_constructor → • nonempty_list(attribute) UIDENT option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) option(eq_tag), SEMI / RBRACE]
+// [203, separated_list(SEMI,enum_constructor) → •, RBRACE]
+// [204, separated_list(SEMI,enum_constructor) → • separated_nonempty_list(SEMI,enum_constructor), RBRACE]
+// [229, nonempty_list(attribute) → • ATTRIBUTE, UIDENT]
+// [230, nonempty_list(attribute) → • ATTRIBUTE nonempty_list(attribute), UIDENT]
+// [233, separated_nonempty_list(SEMI,enum_constructor) → • enum_constructor, RBRACE]
+// [234, separated_nonempty_list(SEMI,enum_constructor) → • enum_constructor SEMI separated_nonempty_list(SEMI,enum_constructor), RBRACE]
 
 ///|
-fn yy_state_60(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_simple_type, yy_action_172)
+fn yy_state_340(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_ATTRIBUTE => Shift(yy_state_17)
+    NT_enum_constructor => Shift(yy_state_178)
+    NT_nonempty_list_attribute_ => Shift(yy_state_181)
+    T_UIDENT => Shift(yy_state_199)
+    NT_separated_nonempty_list_SEMI_enum_constructor_ => Shift(yy_state_202)
+    NT_separated_list_SEMI_enum_constructor_ => Shift(yy_state_341)
+    T_RBRACE =>
+      Reduce(0, NT_separated_list_SEMI_enum_constructor_, yy_action_161)
+    _ => Error
+  }
 }
 
-// [85, simple_type → LPAREN type_ • COMMA separated_nonempty_list(COMMA,type_) RPAREN, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
-// [86, simple_type → LPAREN type_ • RPAREN, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
-// [93, type_ → LPAREN type_ • COMMA RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [94, type_ → LPAREN type_ • COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [98, type_ → LPAREN type_ • RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
+// [71, type_sig → nonempty_list(attribute) ENUM type_decl_name_with_params LBRACE separated_list(SEMI,enum_constructor) • RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_61(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_341(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RPAREN => Shift(yy_state_62)
-    T_COMMA => Shift(yy_state_65)
+    T_RBRACE => Shift(yy_state_342)
     _ => Error
   }
 }
 
-// [86, simple_type → LPAREN type_ RPAREN •, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
-// [98, type_ → LPAREN type_ RPAREN • THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
+// [71, type_sig → nonempty_list(attribute) ENUM type_decl_name_with_params LBRACE separated_list(SEMI,enum_constructor) RBRACE •, EOF / SEMI]
 
 ///|
-fn yy_state_62(_lookahead : YYSymbol) -> YYDecision {
-  match _lookahead {
-    T_THIN_ARROW => Shift(yy_state_63)
-    T_EOF
-    | T_RAISE
-    | T_EQUAL
-    | T_RPAREN
-    | T_COMMA
-    | T_QUESTION
-    | T_SEMI
-    | T_RBRACKET
-    | T_RBRACE
-    | T_AS => Reduce(3, NT_simple_type, yy_action_171)
-    _ => Error
-  }
-}
-
-// [84, simple_type → • simple_type QUESTION, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
-// [85, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
-// [86, simple_type → • LPAREN type_ RPAREN, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
-// [87, simple_type → • qualified_uident_ optional_type_arguments, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
-// [88, simple_type → • AMPER qualified_uident_, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
-// [89, simple_type → • UNDERSCORE, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
-// [90, type_ → • simple_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [91, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [92, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [93, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [94, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [95, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [96, type_ → • LPAREN RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [97, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [98, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [98, type_ → LPAREN type_ RPAREN THIN_ARROW • return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [99, return_type → • type_, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [100, return_type → • simple_type RAISE, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [101, return_type → • simple_type RAISE error_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [102, return_type → • simple_type RAISE QUESTION, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [127, qualified_uident_ → • UIDENT, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / LBRACKET / RBRACKET / RBRACE / AS]
-// [128, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / LBRACKET / RBRACKET / RBRACE / AS]
+fn yy_state_342(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(6, NT_type_sig, yy_action_104)
+}
+
+// [59, type_sig → nonempty_list(attribute) STRUCT • type_decl_name_with_params LBRACE record_decl_body RBRACE, EOF / SEMI]
+// [65, type_sig → nonempty_list(attribute) STRUCT • type_decl_name_with_params LPAREN separated_list(COMMA,type_) RPAREN, EOF / SEMI]
+// [145, type_decl_name_with_params → • uident optional_type_params_no_constraints, LPAREN / LBRACE]
+// [187, uident → • UIDENT, LPAREN / LBRACKET / LBRACE]
 
 ///|
-fn yy_state_63(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_343(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_PACKAGE_NAME => Shift(yy_state_34)
-    T_UIDENT => Shift(yy_state_36)
-    T_ASYNC => Shift(yy_state_37)
-    NT_type_ => Shift(yy_state_41)
-    T_UNDERSCORE => Shift(yy_state_43)
-    T_AMPER => Shift(yy_state_44)
-    NT_qualified_uident_ => Shift(yy_state_46)
-    T_LPAREN => Shift(yy_state_51)
-    NT_simple_type => Shift(yy_state_55)
-    NT_return_type => Shift(yy_state_64)
+    T_UIDENT => Shift(yy_state_23)
+    NT_uident => Shift(yy_state_164)
+    NT_type_decl_name_with_params => Shift(yy_state_344)
     _ => Error
   }
 }
 
-// [98, type_ → LPAREN type_ RPAREN THIN_ARROW return_type •, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-
-///|
-fn yy_state_64(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(5, NT_type_, yy_action_170)
-}
-
-// [84, simple_type → • simple_type QUESTION, RPAREN / COMMA / QUESTION]
-// [85, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, RPAREN / COMMA / QUESTION]
-// [85, simple_type → LPAREN type_ COMMA • separated_nonempty_list(COMMA,type_) RPAREN, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
-// [86, simple_type → • LPAREN type_ RPAREN, RPAREN / COMMA / QUESTION]
-// [87, simple_type → • qualified_uident_ optional_type_arguments, RPAREN / COMMA / QUESTION]
-// [88, simple_type → • AMPER qualified_uident_, RPAREN / COMMA / QUESTION]
-// [89, simple_type → • UNDERSCORE, RPAREN / COMMA / QUESTION]
-// [90, type_ → • simple_type, RPAREN / COMMA]
-// [91, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [92, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [93, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [93, type_ → LPAREN type_ COMMA • RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [94, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [94, type_ → LPAREN type_ COMMA • separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [95, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [96, type_ → • LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [97, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [98, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [127, qualified_uident_ → • UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
-// [128, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
-// [171, separated_nonempty_list(COMMA,type_) → • type_, RPAREN]
-// [172, separated_nonempty_list(COMMA,type_) → • type_ COMMA separated_nonempty_list(COMMA,type_), RPAREN]
+// [59, type_sig → nonempty_list(attribute) STRUCT type_decl_name_with_params • LBRACE record_decl_body RBRACE, EOF / SEMI]
+// [65, type_sig → nonempty_list(attribute) STRUCT type_decl_name_with_params • LPAREN separated_list(COMMA,type_) RPAREN, EOF / SEMI]
 
 ///|
-fn yy_state_65(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_344(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_PACKAGE_NAME => Shift(yy_state_34)
-    T_UIDENT => Shift(yy_state_36)
-    T_ASYNC => Shift(yy_state_37)
-    T_UNDERSCORE => Shift(yy_state_43)
-    T_AMPER => Shift(yy_state_44)
-    NT_qualified_uident_ => Shift(yy_state_46)
-    NT_type_ => Shift(yy_state_48)
-    T_LPAREN => Shift(yy_state_51)
-    T_RPAREN => Shift(yy_state_66)
-    NT_separated_nonempty_list_COMMA_type__ => Shift(yy_state_69)
-    NT_simple_type => Shift(yy_state_73)
+    T_LPAREN => Shift(yy_state_345)
+    T_LBRACE => Shift(yy_state_348)
     _ => Error
   }
 }
 
-// [93, type_ → LPAREN type_ COMMA RPAREN • THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
+// [65, type_sig → nonempty_list(attribute) STRUCT type_decl_name_with_params LPAREN • separated_list(COMMA,type_) RPAREN, EOF / SEMI]
+// [146, simple_type → • simple_type QUESTION, RPAREN / COMMA / QUESTION]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, RPAREN / COMMA / QUESTION]
+// [148, simple_type → • LPAREN type_ RPAREN, RPAREN / COMMA / QUESTION]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, RPAREN / COMMA / QUESTION]
+// [150, simple_type → • AMPER qualified_uident_, RPAREN / COMMA / QUESTION]
+// [151, simple_type → • UNDERSCORE, RPAREN / COMMA / QUESTION]
+// [152, type_ → • simple_type, RPAREN / COMMA]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [185, qualified_uident_ → • UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
+// [205, separated_list(COMMA,type_) → •, RPAREN]
+// [206, separated_list(COMMA,type_) → • separated_nonempty_list(COMMA,type_), RPAREN]
+// [227, separated_nonempty_list(COMMA,type_) → • type_, RPAREN]
+// [228, separated_nonempty_list(COMMA,type_) → • type_ COMMA separated_nonempty_list(COMMA,type_), RPAREN]
 
 ///|
-fn yy_state_66(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_345(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_THIN_ARROW => Shift(yy_state_67)
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    NT_type_ => Shift(yy_state_79)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_104)
+    NT_separated_nonempty_list_COMMA_type__ => Shift(yy_state_208)
+    NT_separated_list_COMMA_type__ => Shift(yy_state_346)
+    T_RPAREN => Reduce(0, NT_separated_list_COMMA_type__, yy_action_142)
     _ => Error
   }
 }
 
-// [84, simple_type → • simple_type QUESTION, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
-// [85, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
-// [86, simple_type → • LPAREN type_ RPAREN, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
-// [87, simple_type → • qualified_uident_ optional_type_arguments, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
-// [88, simple_type → • AMPER qualified_uident_, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
-// [89, simple_type → • UNDERSCORE, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
-// [90, type_ → • simple_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [91, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [92, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [93, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [93, type_ → LPAREN type_ COMMA RPAREN THIN_ARROW • return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [94, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [95, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [96, type_ → • LPAREN RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [97, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [98, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [99, return_type → • type_, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [100, return_type → • simple_type RAISE, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [101, return_type → • simple_type RAISE error_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [102, return_type → • simple_type RAISE QUESTION, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [127, qualified_uident_ → • UIDENT, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / LBRACKET / RBRACKET / RBRACE / AS]
-// [128, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / LBRACKET / RBRACKET / RBRACE / AS]
+// [65, type_sig → nonempty_list(attribute) STRUCT type_decl_name_with_params LPAREN separated_list(COMMA,type_) • RPAREN, EOF / SEMI]
 
 ///|
-fn yy_state_67(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_346(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_PACKAGE_NAME => Shift(yy_state_34)
-    T_UIDENT => Shift(yy_state_36)
-    T_ASYNC => Shift(yy_state_37)
-    NT_type_ => Shift(yy_state_41)
-    T_UNDERSCORE => Shift(yy_state_43)
-    T_AMPER => Shift(yy_state_44)
-    NT_qualified_uident_ => Shift(yy_state_46)
-    T_LPAREN => Shift(yy_state_51)
-    NT_simple_type => Shift(yy_state_55)
-    NT_return_type => Shift(yy_state_68)
+    T_RPAREN => Shift(yy_state_347)
     _ => Error
   }
 }
 
-// [93, type_ → LPAREN type_ COMMA RPAREN THIN_ARROW return_type •, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
+// [65, type_sig → nonempty_list(attribute) STRUCT type_decl_name_with_params LPAREN separated_list(COMMA,type_) RPAREN •, EOF / SEMI]
 
 ///|
-fn yy_state_68(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(6, NT_type_, yy_action_169)
+fn yy_state_347(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(6, NT_type_sig, yy_action_103)
+}
+
+// [59, type_sig → nonempty_list(attribute) STRUCT type_decl_name_with_params LBRACE • record_decl_body RBRACE, EOF / SEMI]
+// [124, record_decl_field → • boption(MUTABLE) LIDENT COLON type_, SEMI / RBRACE]
+// [125, record_decl_field → • nonempty_list(attribute) boption(MUTABLE) LIDENT COLON type_, SEMI / RBRACE]
+// [126, record_decl_constr → • ASYNC FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, RBRACE]
+// [127, record_decl_constr → • FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, RBRACE]
+// [128, record_decl_constr → • nonempty_list(attribute) ASYNC FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, RBRACE]
+// [129, record_decl_constr → • nonempty_list(attribute) FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, RBRACE]
+// [130, record_decl_body → •, RBRACE]
+// [131, record_decl_body → • record_decl_constr, RBRACE]
+// [132, record_decl_body → • record_decl_body_nonempty, RBRACE]
+// [133, record_decl_body_nonempty → • record_decl_field SEMI record_decl_constr, RBRACE]
+// [134, record_decl_body_nonempty → • record_decl_field, RBRACE]
+// [135, record_decl_body_nonempty → • record_decl_field SEMI record_decl_body_nonempty, RBRACE]
+// [219, boption(MUTABLE) → •, LIDENT]
+// [220, boption(MUTABLE) → • MUTABLE, LIDENT]
+// [229, nonempty_list(attribute) → • ATTRIBUTE, LIDENT / ASYNC / FN / MUTABLE]
+// [230, nonempty_list(attribute) → • ATTRIBUTE nonempty_list(attribute), LIDENT / ASYNC / FN / MUTABLE]
+
+///|
+fn yy_state_348(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_ATTRIBUTE => Shift(yy_state_17)
+    T_MUTABLE => Shift(yy_state_184)
+    NT_record_decl_field => Shift(yy_state_212)
+    T_FN => Shift(yy_state_216)
+    T_ASYNC => Shift(yy_state_232)
+    NT_nonempty_list_attribute_ => Shift(yy_state_242)
+    NT_boption_MUTABLE_ => Shift(yy_state_266)
+    NT_record_decl_body_nonempty => Shift(yy_state_270)
+    NT_record_decl_constr => Shift(yy_state_271)
+    NT_record_decl_body => Shift(yy_state_349)
+    T_RBRACE => Reduce(0, NT_record_decl_body, yy_action_139)
+    T_LIDENT => Reduce(0, NT_boption_MUTABLE_, yy_action_157)
+    _ => Error
+  }
 }
 
-// [85, simple_type → LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) • RPAREN, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
-// [94, type_ → LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) • RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
+// [59, type_sig → nonempty_list(attribute) STRUCT type_decl_name_with_params LBRACE record_decl_body • RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_69(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_349(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RPAREN => Shift(yy_state_70)
+    T_RBRACE => Shift(yy_state_350)
     _ => Error
   }
 }
 
-// [85, simple_type → LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN •, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
-// [94, type_ → LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN • THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
+// [59, type_sig → nonempty_list(attribute) STRUCT type_decl_name_with_params LBRACE record_decl_body RBRACE •, EOF / SEMI]
 
 ///|
-fn yy_state_70(_lookahead : YYSymbol) -> YYDecision {
-  match _lookahead {
-    T_THIN_ARROW => Shift(yy_state_71)
-    T_EOF
-    | T_RAISE
-    | T_EQUAL
-    | T_RPAREN
-    | T_COMMA
-    | T_QUESTION
-    | T_SEMI
-    | T_RBRACKET
-    | T_RBRACE
-    | T_AS => Reduce(5, NT_simple_type, yy_action_168)
-    _ => Error
-  }
-}
-
-// [84, simple_type → • simple_type QUESTION, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
-// [85, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
-// [86, simple_type → • LPAREN type_ RPAREN, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
-// [87, simple_type → • qualified_uident_ optional_type_arguments, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
-// [88, simple_type → • AMPER qualified_uident_, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
-// [89, simple_type → • UNDERSCORE, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
-// [90, type_ → • simple_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [91, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [92, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [93, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [94, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [94, type_ → LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW • return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [95, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [96, type_ → • LPAREN RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [97, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [98, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [99, return_type → • type_, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [100, return_type → • simple_type RAISE, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [101, return_type → • simple_type RAISE error_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [102, return_type → • simple_type RAISE QUESTION, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [127, qualified_uident_ → • UIDENT, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / LBRACKET / RBRACKET / RBRACE / AS]
-// [128, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / LBRACKET / RBRACKET / RBRACE / AS]
+fn yy_state_350(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(6, NT_type_sig, yy_action_102)
+}
+
+// [47, type_sig → nonempty_list(attribute) SUBERROR • uident option(type_), EOF / SEMI]
+// [53, type_sig → nonempty_list(attribute) SUBERROR • uident LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [187, uident → • UIDENT, UIDENT / EOF / ASYNC / LPAREN / SEMI / UNDERSCORE / LBRACE / AMPER / PACKAGE_NAME]
 
 ///|
-fn yy_state_71(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_351(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_PACKAGE_NAME => Shift(yy_state_34)
-    T_UIDENT => Shift(yy_state_36)
-    T_ASYNC => Shift(yy_state_37)
-    NT_type_ => Shift(yy_state_41)
-    T_UNDERSCORE => Shift(yy_state_43)
-    T_AMPER => Shift(yy_state_44)
-    NT_qualified_uident_ => Shift(yy_state_46)
-    T_LPAREN => Shift(yy_state_51)
-    NT_simple_type => Shift(yy_state_55)
-    NT_return_type => Shift(yy_state_72)
+    T_UIDENT => Shift(yy_state_23)
+    NT_uident => Shift(yy_state_352)
     _ => Error
   }
 }
 
-// [94, type_ → LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type •, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
+// [47, type_sig → nonempty_list(attribute) SUBERROR uident • option(type_), EOF / SEMI]
+// [53, type_sig → nonempty_list(attribute) SUBERROR uident • LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [146, simple_type → • simple_type QUESTION, EOF / QUESTION / SEMI]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EOF / QUESTION / SEMI]
+// [148, simple_type → • LPAREN type_ RPAREN, EOF / QUESTION / SEMI]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, EOF / QUESTION / SEMI]
+// [150, simple_type → • AMPER qualified_uident_, EOF / QUESTION / SEMI]
+// [151, simple_type → • UNDERSCORE, EOF / QUESTION / SEMI]
+// [152, type_ → • simple_type, EOF / SEMI]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [185, qualified_uident_ → • UIDENT, EOF / QUESTION / SEMI / LBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EOF / QUESTION / SEMI / LBRACKET]
+// [201, option(type_) → •, EOF / SEMI]
+// [202, option(type_) → • type_, EOF / SEMI]
 
 ///|
-fn yy_state_72(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(7, NT_type_, yy_action_166)
+fn yy_state_352(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_104)
+    NT_type_ => Shift(yy_state_276)
+    T_LBRACE => Shift(yy_state_353)
+    NT_option_type__ => Shift(yy_state_356)
+    T_EOF | T_SEMI => Reduce(0, NT_option_type__, yy_action_120)
+    _ => Error
+  }
 }
 
-// [84, simple_type → simple_type • QUESTION, EOF / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
-// [90, type_ → simple_type •, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
+// [53, type_sig → nonempty_list(attribute) SUBERROR uident LBRACE • separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [120, enum_constructor → • UIDENT option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) option(eq_tag), SEMI / RBRACE]
+// [121, enum_constructor → • nonempty_list(attribute) UIDENT option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) option(eq_tag), SEMI / RBRACE]
+// [203, separated_list(SEMI,enum_constructor) → •, RBRACE]
+// [204, separated_list(SEMI,enum_constructor) → • separated_nonempty_list(SEMI,enum_constructor), RBRACE]
+// [229, nonempty_list(attribute) → • ATTRIBUTE, UIDENT]
+// [230, nonempty_list(attribute) → • ATTRIBUTE nonempty_list(attribute), UIDENT]
+// [233, separated_nonempty_list(SEMI,enum_constructor) → • enum_constructor, RBRACE]
+// [234, separated_nonempty_list(SEMI,enum_constructor) → • enum_constructor SEMI separated_nonempty_list(SEMI,enum_constructor), RBRACE]
 
 ///|
-fn yy_state_73(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_353(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_QUESTION => Shift(yy_state_60)
-    T_EOF
-    | T_EQUAL
-    | T_RPAREN
-    | T_COMMA
-    | T_SEMI
-    | T_RBRACKET
-    | T_RBRACE
-    | T_AS => Reduce(1, NT_type_, yy_action_177)
+    T_ATTRIBUTE => Shift(yy_state_17)
+    NT_enum_constructor => Shift(yy_state_178)
+    NT_nonempty_list_attribute_ => Shift(yy_state_181)
+    T_UIDENT => Shift(yy_state_199)
+    NT_separated_nonempty_list_SEMI_enum_constructor_ => Shift(yy_state_202)
+    NT_separated_list_SEMI_enum_constructor_ => Shift(yy_state_354)
+    T_RBRACE =>
+      Reduce(0, NT_separated_list_SEMI_enum_constructor_, yy_action_161)
     _ => Error
   }
 }
 
-// [104, optional_type_arguments → LBRACKET separated_nonempty_list(COMMA,type_) • RBRACKET, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
+// [53, type_sig → nonempty_list(attribute) SUBERROR uident LBRACE separated_list(SEMI,enum_constructor) • RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_74(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_354(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RBRACKET => Shift(yy_state_75)
+    T_RBRACE => Shift(yy_state_355)
     _ => Error
   }
 }
 
-// [104, optional_type_arguments → LBRACKET separated_nonempty_list(COMMA,type_) RBRACKET •, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
+// [53, type_sig → nonempty_list(attribute) SUBERROR uident LBRACE separated_list(SEMI,enum_constructor) RBRACE •, EOF / SEMI]
 
 ///|
-fn yy_state_75(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_optional_type_arguments, yy_action_164)
+fn yy_state_355(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(6, NT_type_sig, yy_action_101)
 }
 
-// [87, simple_type → qualified_uident_ optional_type_arguments •, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
+// [47, type_sig → nonempty_list(attribute) SUBERROR uident option(type_) •, EOF / SEMI]
 
 ///|
-fn yy_state_76(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_simple_type, yy_action_163)
+fn yy_state_356(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(4, NT_type_sig, yy_action_100)
 }
 
-// [91, type_ → ASYNC LPAREN type_ • COMMA RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [92, type_ → ASYNC LPAREN type_ • COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [97, type_ → ASYNC LPAREN type_ • RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
+// [41, type_sig → nonempty_list(attribute) TYPE • type_decl_name_with_params, EOF / SEMI]
+// [103, alias_sig → nonempty_list(attribute) TYPE • type_decl_name_with_params EQUAL type_, EOF / SEMI]
+// [145, type_decl_name_with_params → • uident optional_type_params_no_constraints, EOF / EQUAL / SEMI]
+// [187, uident → • UIDENT, EOF / EQUAL / SEMI / LBRACKET]
 
 ///|
-fn yy_state_77(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_357(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RPAREN => Shift(yy_state_78)
-    T_COMMA => Shift(yy_state_81)
+    T_UIDENT => Shift(yy_state_23)
+    NT_uident => Shift(yy_state_164)
+    NT_type_decl_name_with_params => Shift(yy_state_358)
     _ => Error
   }
 }
 
-// [97, type_ → ASYNC LPAREN type_ RPAREN • THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
+// [41, type_sig → nonempty_list(attribute) TYPE type_decl_name_with_params •, EOF / SEMI]
+// [103, alias_sig → nonempty_list(attribute) TYPE type_decl_name_with_params • EQUAL type_, EOF / SEMI]
 
 ///|
-fn yy_state_78(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_358(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_THIN_ARROW => Shift(yy_state_79)
+    T_EQUAL => Shift(yy_state_359)
+    T_EOF | T_SEMI => Reduce(3, NT_type_sig, yy_action_99)
     _ => Error
   }
 }
 
-// [84, simple_type → • simple_type QUESTION, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
-// [85, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
-// [86, simple_type → • LPAREN type_ RPAREN, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
-// [87, simple_type → • qualified_uident_ optional_type_arguments, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
-// [88, simple_type → • AMPER qualified_uident_, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
-// [89, simple_type → • UNDERSCORE, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
-// [90, type_ → • simple_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [91, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [92, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [93, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [94, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [95, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [96, type_ → • LPAREN RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [97, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [97, type_ → ASYNC LPAREN type_ RPAREN THIN_ARROW • return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [98, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [99, return_type → • type_, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [100, return_type → • simple_type RAISE, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [101, return_type → • simple_type RAISE error_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [102, return_type → • simple_type RAISE QUESTION, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [127, qualified_uident_ → • UIDENT, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / LBRACKET / RBRACKET / RBRACE / AS]
-// [128, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / LBRACKET / RBRACKET / RBRACE / AS]
+// [103, alias_sig → nonempty_list(attribute) TYPE type_decl_name_with_params EQUAL • type_, EOF / SEMI]
+// [146, simple_type → • simple_type QUESTION, EOF / QUESTION / SEMI]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EOF / QUESTION / SEMI]
+// [148, simple_type → • LPAREN type_ RPAREN, EOF / QUESTION / SEMI]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, EOF / QUESTION / SEMI]
+// [150, simple_type → • AMPER qualified_uident_, EOF / QUESTION / SEMI]
+// [151, simple_type → • UNDERSCORE, EOF / QUESTION / SEMI]
+// [152, type_ → • simple_type, EOF / SEMI]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [185, qualified_uident_ → • UIDENT, EOF / QUESTION / SEMI / LBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EOF / QUESTION / SEMI / LBRACKET]
 
 ///|
-fn yy_state_79(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_359(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_PACKAGE_NAME => Shift(yy_state_34)
-    T_UIDENT => Shift(yy_state_36)
-    T_ASYNC => Shift(yy_state_37)
-    NT_type_ => Shift(yy_state_41)
-    T_UNDERSCORE => Shift(yy_state_43)
-    T_AMPER => Shift(yy_state_44)
-    NT_qualified_uident_ => Shift(yy_state_46)
-    T_LPAREN => Shift(yy_state_51)
-    NT_simple_type => Shift(yy_state_55)
-    NT_return_type => Shift(yy_state_80)
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_104)
+    NT_type_ => Shift(yy_state_360)
     _ => Error
   }
 }
 
-// [97, type_ → ASYNC LPAREN type_ RPAREN THIN_ARROW return_type •, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
+// [103, alias_sig → nonempty_list(attribute) TYPE type_decl_name_with_params EQUAL type_ •, EOF / SEMI]
 
 ///|
-fn yy_state_80(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(6, NT_type_, yy_action_162)
-}
-
-// [84, simple_type → • simple_type QUESTION, RPAREN / COMMA / QUESTION]
-// [85, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, RPAREN / COMMA / QUESTION]
-// [86, simple_type → • LPAREN type_ RPAREN, RPAREN / COMMA / QUESTION]
-// [87, simple_type → • qualified_uident_ optional_type_arguments, RPAREN / COMMA / QUESTION]
-// [88, simple_type → • AMPER qualified_uident_, RPAREN / COMMA / QUESTION]
-// [89, simple_type → • UNDERSCORE, RPAREN / COMMA / QUESTION]
-// [90, type_ → • simple_type, RPAREN / COMMA]
-// [91, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [91, type_ → ASYNC LPAREN type_ COMMA • RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [92, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [92, type_ → ASYNC LPAREN type_ COMMA • separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [93, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [94, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [95, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [96, type_ → • LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [97, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [98, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [127, qualified_uident_ → • UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
-// [128, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
-// [171, separated_nonempty_list(COMMA,type_) → • type_, RPAREN]
-// [172, separated_nonempty_list(COMMA,type_) → • type_ COMMA separated_nonempty_list(COMMA,type_), RPAREN]
-
-///|
-fn yy_state_81(_lookahead : YYSymbol) -> YYDecision {
-  match _lookahead {
-    T_PACKAGE_NAME => Shift(yy_state_34)
-    T_UIDENT => Shift(yy_state_36)
-    T_ASYNC => Shift(yy_state_37)
-    T_UNDERSCORE => Shift(yy_state_43)
-    T_AMPER => Shift(yy_state_44)
-    NT_qualified_uident_ => Shift(yy_state_46)
-    NT_type_ => Shift(yy_state_48)
-    T_LPAREN => Shift(yy_state_51)
-    NT_simple_type => Shift(yy_state_73)
-    NT_separated_nonempty_list_COMMA_type__ => Shift(yy_state_82)
-    T_RPAREN => Shift(yy_state_86)
-    _ => Error
-  }
+fn yy_state_360(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(5, NT_alias_sig, yy_action_98)
 }
 
-// [92, type_ → ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) • RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
+// [35, func_sig → nonempty_list(attribute) FN • loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [138, type_params_with_constraints → • LBRACKET separated_list(COMMA,type_param_with_constraints) RBRACKET, LIDENT / UIDENT / AMPER]
+// [193, loption(type_params_with_constraints) → •, LIDENT / UIDENT / AMPER]
+// [194, loption(type_params_with_constraints) → • type_params_with_constraints, LIDENT / UIDENT / AMPER]
 
 ///|
-fn yy_state_82(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_361(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RPAREN => Shift(yy_state_83)
+    T_LBRACKET => Shift(yy_state_142)
+    NT_type_params_with_constraints => Shift(yy_state_217)
+    NT_loption_type_params_with_constraints_ => Shift(yy_state_362)
+    T_LIDENT | T_UIDENT | T_AMPER =>
+      Reduce(0, NT_loption_type_params_with_constraints_, yy_action_135)
     _ => Error
   }
 }
 
-// [92, type_ → ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN • THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
+// [28, method_self_type_coloncolon → • UIDENT COLONCOLON, LIDENT]
+// [29, method_self_type_coloncolon → • AMPER UIDENT COLONCOLON, LIDENT]
+// [35, func_sig → nonempty_list(attribute) FN loption(type_params_with_constraints) • option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [195, option(method_self_type_coloncolon) → •, LIDENT]
+// [196, option(method_self_type_coloncolon) → • method_self_type_coloncolon, LIDENT]
 
 ///|
-fn yy_state_83(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_362(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_THIN_ARROW => Shift(yy_state_84)
+    NT_method_self_type_coloncolon => Shift(yy_state_219)
+    T_AMPER => Shift(yy_state_227)
+    T_UIDENT => Shift(yy_state_230)
+    NT_option_method_self_type_coloncolon_ => Shift(yy_state_363)
+    T_LIDENT => Reduce(0, NT_option_method_self_type_coloncolon_, yy_action_133)
     _ => Error
   }
 }
 
-// [84, simple_type → • simple_type QUESTION, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
-// [85, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
-// [86, simple_type → • LPAREN type_ RPAREN, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
-// [87, simple_type → • qualified_uident_ optional_type_arguments, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
-// [88, simple_type → • AMPER qualified_uident_, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
-// [89, simple_type → • UNDERSCORE, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
-// [90, type_ → • simple_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [91, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [92, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [92, type_ → ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW • return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [93, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [94, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [95, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [96, type_ → • LPAREN RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [97, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [98, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [99, return_type → • type_, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [100, return_type → • simple_type RAISE, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [101, return_type → • simple_type RAISE error_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [102, return_type → • simple_type RAISE QUESTION, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [127, qualified_uident_ → • UIDENT, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / LBRACKET / RBRACKET / RBRACE / AS]
-// [128, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / LBRACKET / RBRACKET / RBRACE / AS]
+// [35, func_sig → nonempty_list(attribute) FN loption(type_params_with_constraints) option(method_self_type_coloncolon) • lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [188, lident → • LIDENT, LPAREN]
 
 ///|
-fn yy_state_84(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_363(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_PACKAGE_NAME => Shift(yy_state_34)
-    T_UIDENT => Shift(yy_state_36)
-    T_ASYNC => Shift(yy_state_37)
-    NT_type_ => Shift(yy_state_41)
-    T_UNDERSCORE => Shift(yy_state_43)
-    T_AMPER => Shift(yy_state_44)
-    NT_qualified_uident_ => Shift(yy_state_46)
-    T_LPAREN => Shift(yy_state_51)
-    NT_simple_type => Shift(yy_state_55)
-    NT_return_type => Shift(yy_state_85)
+    T_LIDENT => Shift(yy_state_36)
+    NT_lident => Shift(yy_state_364)
     _ => Error
   }
 }
 
-// [92, type_ → ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type •, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-
-///|
-fn yy_state_85(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(8, NT_type_, yy_action_160)
-}
-
-// [91, type_ → ASYNC LPAREN type_ COMMA RPAREN • THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
+// [35, func_sig → nonempty_list(attribute) FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident • LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, EOF / SEMI]
 
 ///|
-fn yy_state_86(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_364(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_THIN_ARROW => Shift(yy_state_87)
+    T_LPAREN => Shift(yy_state_365)
     _ => Error
   }
 }
 
-// [84, simple_type → • simple_type QUESTION, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
-// [85, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
-// [86, simple_type → • LPAREN type_ RPAREN, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
-// [87, simple_type → • qualified_uident_ optional_type_arguments, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
-// [88, simple_type → • AMPER qualified_uident_, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
-// [89, simple_type → • UNDERSCORE, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / RBRACKET / RBRACE / AS]
-// [90, type_ → • simple_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [91, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [91, type_ → ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW • return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [92, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [93, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [94, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [95, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [96, type_ → • LPAREN RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [97, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [98, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [99, return_type → • type_, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [100, return_type → • simple_type RAISE, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [101, return_type → • simple_type RAISE error_type, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [102, return_type → • simple_type RAISE QUESTION, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-// [127, qualified_uident_ → • UIDENT, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / LBRACKET / RBRACKET / RBRACE / AS]
-// [128, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EOF / RAISE / EQUAL / RPAREN / COMMA / QUESTION / SEMI / LBRACKET / RBRACKET / RBRACE / AS]
+// [35, func_sig → nonempty_list(attribute) FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN • separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [146, simple_type → • simple_type QUESTION, RPAREN / COMMA / QUESTION]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, RPAREN / COMMA / QUESTION]
+// [148, simple_type → • LPAREN type_ RPAREN, RPAREN / COMMA / QUESTION]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, RPAREN / COMMA / QUESTION]
+// [150, simple_type → • AMPER qualified_uident_, RPAREN / COMMA / QUESTION]
+// [151, simple_type → • UNDERSCORE, RPAREN / COMMA / QUESTION]
+// [152, type_ → • simple_type, RPAREN / COMMA]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [168, parameter → • type_, RPAREN / COMMA]
+// [169, parameter → • post_label COLON type_, RPAREN / COMMA]
+// [170, parameter → • label QUESTION COLON type_, RPAREN / COMMA]
+// [185, qualified_uident_ → • UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
+// [189, label → • LIDENT, QUESTION]
+// [190, post_label → • POST_LABEL, COLON]
+// [197, separated_list(COMMA,parameter) → •, RPAREN]
+// [198, separated_list(COMMA,parameter) → • separated_nonempty_list(COMMA,parameter), RPAREN]
+// [231, separated_nonempty_list(COMMA,parameter) → • parameter, RPAREN]
+// [232, separated_nonempty_list(COMMA,parameter) → • parameter COMMA separated_nonempty_list(COMMA,parameter), RPAREN]
 
 ///|
-fn yy_state_87(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_365(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_PACKAGE_NAME => Shift(yy_state_34)
-    T_UIDENT => Shift(yy_state_36)
-    T_ASYNC => Shift(yy_state_37)
-    NT_type_ => Shift(yy_state_41)
-    T_UNDERSCORE => Shift(yy_state_43)
-    T_AMPER => Shift(yy_state_44)
-    NT_qualified_uident_ => Shift(yy_state_46)
-    T_LPAREN => Shift(yy_state_51)
-    NT_simple_type => Shift(yy_state_55)
-    NT_return_type => Shift(yy_state_88)
+    NT_parameter => Shift(yy_state_56)
+    T_POST_LABEL => Shift(yy_state_59)
+    T_LIDENT => Shift(yy_state_60)
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    NT_label => Shift(yy_state_64)
+    T_ASYNC => Shift(yy_state_68)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_104)
+    NT_post_label => Shift(yy_state_120)
+    NT_type_ => Shift(yy_state_123)
+    NT_separated_nonempty_list_COMMA_parameter_ => Shift(yy_state_124)
+    NT_separated_list_COMMA_parameter_ => Shift(yy_state_366)
+    T_RPAREN => Reduce(0, NT_separated_list_COMMA_parameter_, yy_action_227)
     _ => Error
   }
 }
 
-// [91, type_ → ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type •, EOF / EQUAL / RPAREN / COMMA / SEMI / RBRACKET / RBRACE / AS]
-
-///|
-fn yy_state_88(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(7, NT_type_, yy_action_157)
-}
-
-// [61, alias_sig → TYPEALIAS type_ • AS type_decl_name_with_params, EOF / SEMI]
+// [35, func_sig → nonempty_list(attribute) FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) • RPAREN THIN_ARROW return_type, EOF / SEMI]
 
 ///|
-fn yy_state_89(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_366(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_AS => Shift(yy_state_90)
+    T_RPAREN => Shift(yy_state_367)
     _ => Error
   }
 }
 
-// [61, alias_sig → TYPEALIAS type_ AS • type_decl_name_with_params, EOF / SEMI]
-// [83, type_decl_name_with_params → • uident optional_type_params_no_constraints, EOF / SEMI]
-// [129, uident → • UIDENT, EOF / SEMI / LBRACKET]
+// [35, func_sig → nonempty_list(attribute) FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN • THIN_ARROW return_type, EOF / SEMI]
 
 ///|
-fn yy_state_90(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_367(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_31)
-    NT_uident => Shift(yy_state_91)
-    NT_type_decl_name_with_params => Shift(yy_state_103)
+    T_THIN_ARROW => Shift(yy_state_368)
     _ => Error
   }
 }
 
-// [79, type_params_no_constraints → • LBRACKET separated_list(COMMA,type_param_no_constraints) RBRACKET, UIDENT / EOF / ASYNC / LPAREN / SEMI / UNDERSCORE / LBRACE / AMPER / PACKAGE_NAME]
-// [80, optional_type_params_no_constraints → •, UIDENT / EOF / ASYNC / LPAREN / SEMI / UNDERSCORE / LBRACE / AMPER / PACKAGE_NAME]
-// [81, optional_type_params_no_constraints → • type_params_no_constraints, UIDENT / EOF / ASYNC / LPAREN / SEMI / UNDERSCORE / LBRACE / AMPER / PACKAGE_NAME]
-// [83, type_decl_name_with_params → uident • optional_type_params_no_constraints, UIDENT / EOF / ASYNC / LPAREN / SEMI / UNDERSCORE / LBRACE / AMPER / PACKAGE_NAME]
+// [35, func_sig → nonempty_list(attribute) FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW • return_type, EOF / SEMI]
+// [146, simple_type → • simple_type QUESTION, EOF / RAISE / QUESTION / SEMI]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EOF / RAISE / QUESTION / SEMI]
+// [148, simple_type → • LPAREN type_ RPAREN, EOF / RAISE / QUESTION / SEMI]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, EOF / RAISE / QUESTION / SEMI]
+// [150, simple_type → • AMPER qualified_uident_, EOF / RAISE / QUESTION / SEMI]
+// [151, simple_type → • UNDERSCORE, EOF / RAISE / QUESTION / SEMI]
+// [152, type_ → • simple_type, EOF / SEMI]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [161, return_type → • type_, EOF / SEMI]
+// [162, return_type → • simple_type RAISE, EOF / SEMI]
+// [163, return_type → • simple_type RAISE error_type, EOF / SEMI]
+// [164, return_type → • simple_type RAISE QUESTION, EOF / SEMI]
+// [185, qualified_uident_ → • UIDENT, EOF / RAISE / QUESTION / SEMI / LBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EOF / RAISE / QUESTION / SEMI / LBRACKET]
 
 ///|
-fn yy_state_91(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_368(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_optional_type_params_no_constraints => Shift(yy_state_92)
-    NT_type_params_no_constraints => Shift(yy_state_93)
-    T_LBRACKET => Shift(yy_state_94)
-    T_UIDENT
-    | T_EOF
-    | T_ASYNC
-    | T_LPAREN
-    | T_SEMI
-    | T_UNDERSCORE
-    | T_LBRACE
-    | T_AMPER
-    | T_PACKAGE_NAME =>
-      Reduce(0, NT_optional_type_params_no_constraints, yy_action_156)
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    NT_type_ => Shift(yy_state_72)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_86)
+    NT_return_type => Shift(yy_state_369)
     _ => Error
   }
 }
 
-// [83, type_decl_name_with_params → uident optional_type_params_no_constraints •, UIDENT / EOF / ASYNC / LPAREN / SEMI / UNDERSCORE / LBRACE / AMPER / PACKAGE_NAME]
+// [35, func_sig → nonempty_list(attribute) FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type •, EOF / SEMI]
 
 ///|
-fn yy_state_92(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_type_decl_name_with_params, yy_action_155)
+fn yy_state_369(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(10, NT_func_sig, yy_action_96)
 }
 
-// [81, optional_type_params_no_constraints → type_params_no_constraints •, UIDENT / EOF / ASYNC / LPAREN / SEMI / UNDERSCORE / LBRACE / AMPER / PACKAGE_NAME]
+// [34, func_sig → nonempty_list(attribute) ASYNC • FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, EOF / SEMI]
 
 ///|
-fn yy_state_93(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_optional_type_params_no_constraints, yy_action_154)
+fn yy_state_370(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_FN => Shift(yy_state_371)
+    _ => Error
+  }
 }
 
-// [77, type_param_no_constraints → • uident, COMMA / RBRACKET]
-// [78, type_param_no_constraints → • UNDERSCORE, COMMA / RBRACKET]
-// [79, type_params_no_constraints → LBRACKET • separated_list(COMMA,type_param_no_constraints) RBRACKET, UIDENT / EOF / ASYNC / LPAREN / SEMI / UNDERSCORE / LBRACE / AMPER / PACKAGE_NAME]
-// [129, uident → • UIDENT, COMMA / RBRACKET]
-// [169, separated_list(COMMA,type_param_no_constraints) → •, RBRACKET]
-// [170, separated_list(COMMA,type_param_no_constraints) → • separated_nonempty_list(COMMA,type_param_no_constraints), RBRACKET]
-// [185, separated_nonempty_list(COMMA,type_param_no_constraints) → • type_param_no_constraints, RBRACKET]
-// [186, separated_nonempty_list(COMMA,type_param_no_constraints) → • type_param_no_constraints COMMA separated_nonempty_list(COMMA,type_param_no_constraints), RBRACKET]
+// [34, func_sig → nonempty_list(attribute) ASYNC FN • loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [138, type_params_with_constraints → • LBRACKET separated_list(COMMA,type_param_with_constraints) RBRACKET, LIDENT / UIDENT / AMPER]
+// [193, loption(type_params_with_constraints) → •, LIDENT / UIDENT / AMPER]
+// [194, loption(type_params_with_constraints) → • type_params_with_constraints, LIDENT / UIDENT / AMPER]
 
 ///|
-fn yy_state_94(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_371(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_31)
-    NT_type_param_no_constraints => Shift(yy_state_95)
-    T_UNDERSCORE => Shift(yy_state_98)
-    NT_uident => Shift(yy_state_99)
-    NT_separated_nonempty_list_COMMA_type_param_no_constraints_ =>
-      Shift(yy_state_100)
-    NT_separated_list_COMMA_type_param_no_constraints_ => Shift(yy_state_101)
-    T_RBRACKET =>
-      Reduce(
-        0,
-        NT_separated_list_COMMA_type_param_no_constraints_,
-        yy_action_153,
-      )
+    T_LBRACKET => Shift(yy_state_142)
+    NT_type_params_with_constraints => Shift(yy_state_217)
+    NT_loption_type_params_with_constraints_ => Shift(yy_state_372)
+    T_LIDENT | T_UIDENT | T_AMPER =>
+      Reduce(0, NT_loption_type_params_with_constraints_, yy_action_135)
     _ => Error
   }
 }
 
-// [185, separated_nonempty_list(COMMA,type_param_no_constraints) → type_param_no_constraints •, RBRACKET]
-// [186, separated_nonempty_list(COMMA,type_param_no_constraints) → type_param_no_constraints • COMMA separated_nonempty_list(COMMA,type_param_no_constraints), RBRACKET]
+// [28, method_self_type_coloncolon → • UIDENT COLONCOLON, LIDENT]
+// [29, method_self_type_coloncolon → • AMPER UIDENT COLONCOLON, LIDENT]
+// [34, func_sig → nonempty_list(attribute) ASYNC FN loption(type_params_with_constraints) • option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [195, option(method_self_type_coloncolon) → •, LIDENT]
+// [196, option(method_self_type_coloncolon) → • method_self_type_coloncolon, LIDENT]
 
 ///|
-fn yy_state_95(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_372(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COMMA => Shift(yy_state_96)
-    T_RBRACKET =>
-      Reduce(
-        1,
-        NT_separated_nonempty_list_COMMA_type_param_no_constraints_,
-        yy_action_152,
-      )
+    NT_method_self_type_coloncolon => Shift(yy_state_219)
+    T_AMPER => Shift(yy_state_227)
+    T_UIDENT => Shift(yy_state_230)
+    NT_option_method_self_type_coloncolon_ => Shift(yy_state_373)
+    T_LIDENT => Reduce(0, NT_option_method_self_type_coloncolon_, yy_action_133)
     _ => Error
   }
 }
 
-// [77, type_param_no_constraints → • uident, COMMA / RBRACKET]
-// [78, type_param_no_constraints → • UNDERSCORE, COMMA / RBRACKET]
-// [129, uident → • UIDENT, COMMA / RBRACKET]
-// [185, separated_nonempty_list(COMMA,type_param_no_constraints) → • type_param_no_constraints, RBRACKET]
-// [186, separated_nonempty_list(COMMA,type_param_no_constraints) → • type_param_no_constraints COMMA separated_nonempty_list(COMMA,type_param_no_constraints), RBRACKET]
-// [186, separated_nonempty_list(COMMA,type_param_no_constraints) → type_param_no_constraints COMMA • separated_nonempty_list(COMMA,type_param_no_constraints), RBRACKET]
+// [34, func_sig → nonempty_list(attribute) ASYNC FN loption(type_params_with_constraints) option(method_self_type_coloncolon) • lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [188, lident → • LIDENT, LPAREN]
 
 ///|
-fn yy_state_96(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_373(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_31)
-    NT_type_param_no_constraints => Shift(yy_state_95)
-    NT_separated_nonempty_list_COMMA_type_param_no_constraints_ =>
-      Shift(yy_state_97)
-    T_UNDERSCORE => Shift(yy_state_98)
-    NT_uident => Shift(yy_state_99)
+    T_LIDENT => Shift(yy_state_36)
+    NT_lident => Shift(yy_state_374)
     _ => Error
   }
 }
 
-// [186, separated_nonempty_list(COMMA,type_param_no_constraints) → type_param_no_constraints COMMA separated_nonempty_list(COMMA,type_param_no_constraints) •, RBRACKET]
+// [34, func_sig → nonempty_list(attribute) ASYNC FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident • LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, EOF / SEMI]
 
 ///|
-fn yy_state_97(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(
-    3,
-    NT_separated_nonempty_list_COMMA_type_param_no_constraints_,
-    yy_action_151,
-  )
+fn yy_state_374(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_LPAREN => Shift(yy_state_375)
+    _ => Error
+  }
 }
 
-// [78, type_param_no_constraints → UNDERSCORE •, COMMA / RBRACKET]
+// [34, func_sig → nonempty_list(attribute) ASYNC FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN • separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [146, simple_type → • simple_type QUESTION, RPAREN / COMMA / QUESTION]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, RPAREN / COMMA / QUESTION]
+// [148, simple_type → • LPAREN type_ RPAREN, RPAREN / COMMA / QUESTION]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, RPAREN / COMMA / QUESTION]
+// [150, simple_type → • AMPER qualified_uident_, RPAREN / COMMA / QUESTION]
+// [151, simple_type → • UNDERSCORE, RPAREN / COMMA / QUESTION]
+// [152, type_ → • simple_type, RPAREN / COMMA]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [168, parameter → • type_, RPAREN / COMMA]
+// [169, parameter → • post_label COLON type_, RPAREN / COMMA]
+// [170, parameter → • label QUESTION COLON type_, RPAREN / COMMA]
+// [185, qualified_uident_ → • UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
+// [189, label → • LIDENT, QUESTION]
+// [190, post_label → • POST_LABEL, COLON]
+// [197, separated_list(COMMA,parameter) → •, RPAREN]
+// [198, separated_list(COMMA,parameter) → • separated_nonempty_list(COMMA,parameter), RPAREN]
+// [231, separated_nonempty_list(COMMA,parameter) → • parameter, RPAREN]
+// [232, separated_nonempty_list(COMMA,parameter) → • parameter COMMA separated_nonempty_list(COMMA,parameter), RPAREN]
 
 ///|
-fn yy_state_98(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_type_param_no_constraints, yy_action_150)
+fn yy_state_375(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    NT_parameter => Shift(yy_state_56)
+    T_POST_LABEL => Shift(yy_state_59)
+    T_LIDENT => Shift(yy_state_60)
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    NT_label => Shift(yy_state_64)
+    T_ASYNC => Shift(yy_state_68)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_104)
+    NT_post_label => Shift(yy_state_120)
+    NT_type_ => Shift(yy_state_123)
+    NT_separated_nonempty_list_COMMA_parameter_ => Shift(yy_state_124)
+    NT_separated_list_COMMA_parameter_ => Shift(yy_state_376)
+    T_RPAREN => Reduce(0, NT_separated_list_COMMA_parameter_, yy_action_227)
+    _ => Error
+  }
 }
 
-// [77, type_param_no_constraints → uident •, COMMA / RBRACKET]
+// [34, func_sig → nonempty_list(attribute) ASYNC FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) • RPAREN THIN_ARROW return_type, EOF / SEMI]
 
 ///|
-fn yy_state_99(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_type_param_no_constraints, yy_action_149)
+fn yy_state_376(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_RPAREN => Shift(yy_state_377)
+    _ => Error
+  }
 }
 
-// [170, separated_list(COMMA,type_param_no_constraints) → separated_nonempty_list(COMMA,type_param_no_constraints) •, RBRACKET]
+// [34, func_sig → nonempty_list(attribute) ASYNC FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN • THIN_ARROW return_type, EOF / SEMI]
 
 ///|
-fn yy_state_100(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(
-    1,
-    NT_separated_list_COMMA_type_param_no_constraints_,
-    yy_action_148,
-  )
+fn yy_state_377(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_THIN_ARROW => Shift(yy_state_378)
+    _ => Error
+  }
 }
 
-// [79, type_params_no_constraints → LBRACKET separated_list(COMMA,type_param_no_constraints) • RBRACKET, UIDENT / EOF / ASYNC / LPAREN / SEMI / UNDERSCORE / LBRACE / AMPER / PACKAGE_NAME]
+// [34, func_sig → nonempty_list(attribute) ASYNC FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW • return_type, EOF / SEMI]
+// [146, simple_type → • simple_type QUESTION, EOF / RAISE / QUESTION / SEMI]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EOF / RAISE / QUESTION / SEMI]
+// [148, simple_type → • LPAREN type_ RPAREN, EOF / RAISE / QUESTION / SEMI]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, EOF / RAISE / QUESTION / SEMI]
+// [150, simple_type → • AMPER qualified_uident_, EOF / RAISE / QUESTION / SEMI]
+// [151, simple_type → • UNDERSCORE, EOF / RAISE / QUESTION / SEMI]
+// [152, type_ → • simple_type, EOF / SEMI]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [161, return_type → • type_, EOF / SEMI]
+// [162, return_type → • simple_type RAISE, EOF / SEMI]
+// [163, return_type → • simple_type RAISE error_type, EOF / SEMI]
+// [164, return_type → • simple_type RAISE QUESTION, EOF / SEMI]
+// [185, qualified_uident_ → • UIDENT, EOF / RAISE / QUESTION / SEMI / LBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EOF / RAISE / QUESTION / SEMI / LBRACKET]
 
 ///|
-fn yy_state_101(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_378(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RBRACKET => Shift(yy_state_102)
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    NT_type_ => Shift(yy_state_72)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_86)
+    NT_return_type => Shift(yy_state_379)
     _ => Error
   }
 }
 
-// [79, type_params_no_constraints → LBRACKET separated_list(COMMA,type_param_no_constraints) RBRACKET •, UIDENT / EOF / ASYNC / LPAREN / SEMI / UNDERSCORE / LBRACE / AMPER / PACKAGE_NAME]
+// [34, func_sig → nonempty_list(attribute) ASYNC FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type •, EOF / SEMI]
 
 ///|
-fn yy_state_102(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_type_params_no_constraints, yy_action_147)
+fn yy_state_379(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(11, NT_func_sig, yy_action_93)
 }
 
-// [61, alias_sig → TYPEALIAS type_ AS type_decl_name_with_params •, EOF / SEMI]
+// [25, value_sig → nonempty_list(attribute) LET • lident COLON type_, EOF / SEMI]
+// [188, lident → • LIDENT, COLON]
 
 ///|
-fn yy_state_103(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(4, NT_alias_sig, yy_action_146)
+fn yy_state_380(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_LIDENT => Shift(yy_state_36)
+    NT_lident => Shift(yy_state_381)
+    _ => Error
+  }
 }
 
-// [55, trait_sig → TRAIT • uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
-// [58, trait_sig → TRAIT • uident, EOF / SEMI]
-// [129, uident → • UIDENT, EOF / COLON / SEMI / LBRACE]
+// [25, value_sig → nonempty_list(attribute) LET lident • COLON type_, EOF / SEMI]
 
 ///|
-fn yy_state_104(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_381(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_31)
-    NT_uident => Shift(yy_state_105)
+    T_COLON => Shift(yy_state_382)
     _ => Error
   }
 }
 
-// [55, trait_sig → TRAIT uident • loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
-// [58, trait_sig → TRAIT uident •, EOF / SEMI]
-// [153, loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) → •, LBRACE]
-// [154, loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) → • COLON separated_nonempty_list(PLUS,qualified_uident), LBRACE]
+// [25, value_sig → nonempty_list(attribute) LET lident COLON • type_, EOF / SEMI]
+// [146, simple_type → • simple_type QUESTION, EOF / QUESTION / SEMI]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EOF / QUESTION / SEMI]
+// [148, simple_type → • LPAREN type_ RPAREN, EOF / QUESTION / SEMI]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, EOF / QUESTION / SEMI]
+// [150, simple_type → • AMPER qualified_uident_, EOF / QUESTION / SEMI]
+// [151, simple_type → • UNDERSCORE, EOF / QUESTION / SEMI]
+// [152, type_ → • simple_type, EOF / SEMI]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [185, qualified_uident_ → • UIDENT, EOF / QUESTION / SEMI / LBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EOF / QUESTION / SEMI / LBRACKET]
 
 ///|
-fn yy_state_105(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_382(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_106)
-    NT_loption_preceded_COLON_separated_nonempty_list_PLUS_qualified_uident___ =>
-      Shift(yy_state_111)
-    T_LBRACE =>
-      Reduce(
-        0,
-        NT_loption_preceded_COLON_separated_nonempty_list_PLUS_qualified_uident___,
-        yy_action_144,
-      )
-    T_EOF | T_SEMI => Reduce(2, NT_trait_sig, yy_action_145)
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_104)
+    NT_type_ => Shift(yy_state_383)
     _ => Error
   }
 }
 
-// [125, qualified_uident → • UIDENT, PLUS / LBRACE]
-// [126, qualified_uident → • PACKAGE_NAME DOT_UIDENT, PLUS / LBRACE]
-// [151, separated_nonempty_list(PLUS,qualified_uident) → • qualified_uident, LBRACE]
-// [152, separated_nonempty_list(PLUS,qualified_uident) → • qualified_uident PLUS separated_nonempty_list(PLUS,qualified_uident), LBRACE]
-// [154, loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) → COLON • separated_nonempty_list(PLUS,qualified_uident), LBRACE]
+// [25, value_sig → nonempty_list(attribute) LET lident COLON type_ •, EOF / SEMI]
 
 ///|
-fn yy_state_106(_lookahead : YYSymbol) -> YYDecision {
-  match _lookahead {
-    T_PACKAGE_NAME => Shift(yy_state_21)
-    T_UIDENT => Shift(yy_state_23)
-    NT_separated_nonempty_list_PLUS_qualified_uident_ => Shift(yy_state_107)
-    NT_qualified_uident => Shift(yy_state_108)
-    _ => Error
-  }
+fn yy_state_383(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(5, NT_value_sig, yy_action_92)
 }
 
-// [154, loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) → COLON separated_nonempty_list(PLUS,qualified_uident) •, LBRACE]
+// [21, const_sig → nonempty_list(attribute) PUB • pub_attr CONST uident COLON type_ EQUAL constant, EOF / SEMI]
+// [27, value_sig → nonempty_list(attribute) PUB • pub_attr LET lident COLON type_, EOF / SEMI]
+// [43, type_sig → nonempty_list(attribute) PUB • pub_attr TYPE type_decl_name_with_params, EOF / SEMI]
+// [49, type_sig → nonempty_list(attribute) PUB • pub_attr SUBERROR uident option(type_), EOF / SEMI]
+// [55, type_sig → nonempty_list(attribute) PUB • pub_attr SUBERROR uident LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [61, type_sig → nonempty_list(attribute) PUB • pub_attr STRUCT type_decl_name_with_params LBRACE record_decl_body RBRACE, EOF / SEMI]
+// [67, type_sig → nonempty_list(attribute) PUB • pub_attr STRUCT type_decl_name_with_params LPAREN separated_list(COMMA,type_) RPAREN, EOF / SEMI]
+// [73, type_sig → nonempty_list(attribute) PUB • pub_attr ENUM type_decl_name_with_params LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [79, impl_sig → nonempty_list(attribute) PUB • pub_attr IMPL type_params_with_constraints qualified_uident FOR type_, EOF / SEMI]
+// [85, impl_sig → nonempty_list(attribute) PUB • pub_attr IMPL qualified_uident FOR type_, EOF / SEMI]
+// [91, trait_sig → nonempty_list(attribute) PUB • pub_attr TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
+// [97, trait_sig → nonempty_list(attribute) PUB • pub_attr TRAIT uident, EOF / SEMI]
+// [105, alias_sig → nonempty_list(attribute) PUB • pub_attr TYPE type_decl_name_with_params EQUAL type_, EOF / SEMI]
+// [113, alias_sig → nonempty_list(attribute) PUB • pub_attr USING PACKAGE_NAME LBRACE TYPE uident using_binder RBRACE, EOF / SEMI]
+// [119, alias_sig → nonempty_list(attribute) PUB • pub_attr USING PACKAGE_NAME LBRACE TRAIT uident using_binder RBRACE, EOF / SEMI]
+// [180, pub_attr → •, STRUCT / ENUM / TRAIT / IMPL / LET / CONST / TYPE / SUBERROR / USING]
+// [181, pub_attr → • LPAREN READONLY RPAREN, STRUCT / ENUM / TRAIT / IMPL / LET / CONST / TYPE / SUBERROR / USING]
+// [182, pub_attr → • LPAREN LIDENT RPAREN, STRUCT / ENUM / TRAIT / IMPL / LET / CONST / TYPE / SUBERROR / USING]
 
 ///|
-fn yy_state_107(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(
-    2,
-    NT_loption_preceded_COLON_separated_nonempty_list_PLUS_qualified_uident___,
-    yy_action_142,
-  )
+fn yy_state_384(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_LPAREN => Shift(yy_state_385)
+    NT_pub_attr => Shift(yy_state_390)
+    T_STRUCT
+    | T_ENUM
+    | T_TRAIT
+    | T_IMPL
+    | T_LET
+    | T_CONST
+    | T_TYPE
+    | T_SUBERROR
+    | T_USING => Reduce(0, NT_pub_attr, yy_action_91)
+    _ => Error
+  }
 }
 
-// [151, separated_nonempty_list(PLUS,qualified_uident) → qualified_uident •, LBRACE]
-// [152, separated_nonempty_list(PLUS,qualified_uident) → qualified_uident • PLUS separated_nonempty_list(PLUS,qualified_uident), LBRACE]
+// [181, pub_attr → LPAREN • READONLY RPAREN, STRUCT / ENUM / TRAIT / IMPL / LET / CONST / TYPE / SUBERROR / USING]
+// [182, pub_attr → LPAREN • LIDENT RPAREN, STRUCT / ENUM / TRAIT / IMPL / LET / CONST / TYPE / SUBERROR / USING]
 
 ///|
-fn yy_state_108(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_385(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_PLUS => Shift(yy_state_109)
-    T_LBRACE =>
-      Reduce(
-        1,
-        NT_separated_nonempty_list_PLUS_qualified_uident_,
-        yy_action_141,
-      )
+    T_LIDENT => Shift(yy_state_386)
+    T_READONLY => Shift(yy_state_388)
     _ => Error
   }
 }
 
-// [125, qualified_uident → • UIDENT, PLUS / LBRACE]
-// [126, qualified_uident → • PACKAGE_NAME DOT_UIDENT, PLUS / LBRACE]
-// [151, separated_nonempty_list(PLUS,qualified_uident) → • qualified_uident, LBRACE]
-// [152, separated_nonempty_list(PLUS,qualified_uident) → • qualified_uident PLUS separated_nonempty_list(PLUS,qualified_uident), LBRACE]
-// [152, separated_nonempty_list(PLUS,qualified_uident) → qualified_uident PLUS • separated_nonempty_list(PLUS,qualified_uident), LBRACE]
+// [182, pub_attr → LPAREN LIDENT • RPAREN, STRUCT / ENUM / TRAIT / IMPL / LET / CONST / TYPE / SUBERROR / USING]
 
 ///|
-fn yy_state_109(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_386(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_PACKAGE_NAME => Shift(yy_state_21)
-    T_UIDENT => Shift(yy_state_23)
-    NT_qualified_uident => Shift(yy_state_108)
-    NT_separated_nonempty_list_PLUS_qualified_uident_ => Shift(yy_state_110)
+    T_RPAREN => Shift(yy_state_387)
     _ => Error
   }
 }
 
-// [152, separated_nonempty_list(PLUS,qualified_uident) → qualified_uident PLUS separated_nonempty_list(PLUS,qualified_uident) •, LBRACE]
+// [182, pub_attr → LPAREN LIDENT RPAREN •, STRUCT / ENUM / TRAIT / IMPL / LET / CONST / TYPE / SUBERROR / USING]
 
 ///|
-fn yy_state_110(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(
-    3,
-    NT_separated_nonempty_list_PLUS_qualified_uident_,
-    yy_action_140,
-  )
+fn yy_state_387(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(3, NT_pub_attr, yy_action_90)
 }
 
-// [55, trait_sig → TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) • LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
+// [181, pub_attr → LPAREN READONLY • RPAREN, STRUCT / ENUM / TRAIT / IMPL / LET / CONST / TYPE / SUBERROR / USING]
 
 ///|
-fn yy_state_111(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_388(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACE => Shift(yy_state_112)
+    T_RPAREN => Shift(yy_state_389)
     _ => Error
   }
 }
 
-// [24, trait_method_sig → • lident LPAREN separated_list(COMMA,trait_method_parameter) RPAREN THIN_ARROW return_type boption(eq_underscore), SEMI / RBRACE]
-// [55, trait_sig → TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE • separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
-// [130, lident → • LIDENT, LPAREN]
-// [155, separated_nonempty_list(SEMI,trait_method_sig) → • trait_method_sig, RBRACE]
-// [156, separated_nonempty_list(SEMI,trait_method_sig) → • trait_method_sig SEMI separated_nonempty_list(SEMI,trait_method_sig), RBRACE]
+// [181, pub_attr → LPAREN READONLY RPAREN •, STRUCT / ENUM / TRAIT / IMPL / LET / CONST / TYPE / SUBERROR / USING]
 
 ///|
-fn yy_state_112(_lookahead : YYSymbol) -> YYDecision {
-  match _lookahead {
-    T_LIDENT => Shift(yy_state_26)
-    NT_trait_method_sig => Shift(yy_state_113)
-    NT_lident => Shift(yy_state_116)
-    NT_separated_nonempty_list_SEMI_trait_method_sig_ => Shift(yy_state_134)
-    _ => Error
-  }
+fn yy_state_389(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(3, NT_pub_attr, yy_action_89)
 }
 
-// [155, separated_nonempty_list(SEMI,trait_method_sig) → trait_method_sig •, RBRACE]
-// [156, separated_nonempty_list(SEMI,trait_method_sig) → trait_method_sig • SEMI separated_nonempty_list(SEMI,trait_method_sig), RBRACE]
+// [21, const_sig → nonempty_list(attribute) PUB pub_attr • CONST uident COLON type_ EQUAL constant, EOF / SEMI]
+// [27, value_sig → nonempty_list(attribute) PUB pub_attr • LET lident COLON type_, EOF / SEMI]
+// [43, type_sig → nonempty_list(attribute) PUB pub_attr • TYPE type_decl_name_with_params, EOF / SEMI]
+// [49, type_sig → nonempty_list(attribute) PUB pub_attr • SUBERROR uident option(type_), EOF / SEMI]
+// [55, type_sig → nonempty_list(attribute) PUB pub_attr • SUBERROR uident LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [61, type_sig → nonempty_list(attribute) PUB pub_attr • STRUCT type_decl_name_with_params LBRACE record_decl_body RBRACE, EOF / SEMI]
+// [67, type_sig → nonempty_list(attribute) PUB pub_attr • STRUCT type_decl_name_with_params LPAREN separated_list(COMMA,type_) RPAREN, EOF / SEMI]
+// [73, type_sig → nonempty_list(attribute) PUB pub_attr • ENUM type_decl_name_with_params LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [79, impl_sig → nonempty_list(attribute) PUB pub_attr • IMPL type_params_with_constraints qualified_uident FOR type_, EOF / SEMI]
+// [85, impl_sig → nonempty_list(attribute) PUB pub_attr • IMPL qualified_uident FOR type_, EOF / SEMI]
+// [91, trait_sig → nonempty_list(attribute) PUB pub_attr • TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
+// [97, trait_sig → nonempty_list(attribute) PUB pub_attr • TRAIT uident, EOF / SEMI]
+// [105, alias_sig → nonempty_list(attribute) PUB pub_attr • TYPE type_decl_name_with_params EQUAL type_, EOF / SEMI]
+// [113, alias_sig → nonempty_list(attribute) PUB pub_attr • USING PACKAGE_NAME LBRACE TYPE uident using_binder RBRACE, EOF / SEMI]
+// [119, alias_sig → nonempty_list(attribute) PUB pub_attr • USING PACKAGE_NAME LBRACE TRAIT uident using_binder RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_113(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_390(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_SEMI => Shift(yy_state_114)
-    T_RBRACE =>
-      Reduce(
-        1,
-        NT_separated_nonempty_list_SEMI_trait_method_sig_,
-        yy_action_139,
-      )
+    T_USING => Shift(yy_state_391)
+    T_TRAIT => Shift(yy_state_402)
+    T_IMPL => Shift(yy_state_408)
+    T_ENUM => Shift(yy_state_416)
+    T_STRUCT => Shift(yy_state_421)
+    T_SUBERROR => Shift(yy_state_429)
+    T_TYPE => Shift(yy_state_435)
+    T_LET => Shift(yy_state_439)
+    T_CONST => Shift(yy_state_443)
     _ => Error
   }
 }
 
-// [24, trait_method_sig → • lident LPAREN separated_list(COMMA,trait_method_parameter) RPAREN THIN_ARROW return_type boption(eq_underscore), SEMI / RBRACE]
-// [130, lident → • LIDENT, LPAREN]
-// [155, separated_nonempty_list(SEMI,trait_method_sig) → • trait_method_sig, RBRACE]
-// [156, separated_nonempty_list(SEMI,trait_method_sig) → • trait_method_sig SEMI separated_nonempty_list(SEMI,trait_method_sig), RBRACE]
-// [156, separated_nonempty_list(SEMI,trait_method_sig) → trait_method_sig SEMI • separated_nonempty_list(SEMI,trait_method_sig), RBRACE]
+// [113, alias_sig → nonempty_list(attribute) PUB pub_attr USING • PACKAGE_NAME LBRACE TYPE uident using_binder RBRACE, EOF / SEMI]
+// [119, alias_sig → nonempty_list(attribute) PUB pub_attr USING • PACKAGE_NAME LBRACE TRAIT uident using_binder RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_114(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_391(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LIDENT => Shift(yy_state_26)
-    NT_trait_method_sig => Shift(yy_state_113)
-    NT_separated_nonempty_list_SEMI_trait_method_sig_ => Shift(yy_state_115)
-    NT_lident => Shift(yy_state_116)
+    T_PACKAGE_NAME => Shift(yy_state_392)
     _ => Error
   }
 }
 
-// [156, separated_nonempty_list(SEMI,trait_method_sig) → trait_method_sig SEMI separated_nonempty_list(SEMI,trait_method_sig) •, RBRACE]
+// [113, alias_sig → nonempty_list(attribute) PUB pub_attr USING PACKAGE_NAME • LBRACE TYPE uident using_binder RBRACE, EOF / SEMI]
+// [119, alias_sig → nonempty_list(attribute) PUB pub_attr USING PACKAGE_NAME • LBRACE TRAIT uident using_binder RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_115(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(
-    3,
-    NT_separated_nonempty_list_SEMI_trait_method_sig_,
-    yy_action_138,
-  )
+fn yy_state_392(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_LBRACE => Shift(yy_state_393)
+    _ => Error
+  }
 }
 
-// [24, trait_method_sig → lident • LPAREN separated_list(COMMA,trait_method_parameter) RPAREN THIN_ARROW return_type boption(eq_underscore), SEMI / RBRACE]
-
-///|
-fn yy_state_116(_lookahead : YYSymbol) -> YYDecision {
-  match _lookahead {
-    T_LPAREN => Shift(yy_state_117)
-    _ => Error
-  }
-}
-
-// [24, trait_method_sig → lident LPAREN • separated_list(COMMA,trait_method_parameter) RPAREN THIN_ARROW return_type boption(eq_underscore), SEMI / RBRACE]
-// [84, simple_type → • simple_type QUESTION, RPAREN / COMMA / QUESTION]
-// [85, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, RPAREN / COMMA / QUESTION]
-// [86, simple_type → • LPAREN type_ RPAREN, RPAREN / COMMA / QUESTION]
-// [87, simple_type → • qualified_uident_ optional_type_arguments, RPAREN / COMMA / QUESTION]
-// [88, simple_type → • AMPER qualified_uident_, RPAREN / COMMA / QUESTION]
-// [89, simple_type → • UNDERSCORE, RPAREN / COMMA / QUESTION]
-// [90, type_ → • simple_type, RPAREN / COMMA]
-// [91, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [92, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [93, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [94, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [95, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [96, type_ → • LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [97, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [98, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [111, trait_method_parameter → • type_, RPAREN / COMMA]
-// [112, trait_method_parameter → • post_label COLON type_, RPAREN / COMMA]
-// [127, qualified_uident_ → • UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
-// [128, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
-// [132, post_label → • POST_LABEL, COLON]
-// [141, separated_list(COMMA,trait_method_parameter) → •, RPAREN]
-// [142, separated_list(COMMA,trait_method_parameter) → • separated_nonempty_list(COMMA,trait_method_parameter), RPAREN]
-// [177, separated_nonempty_list(COMMA,trait_method_parameter) → • trait_method_parameter, RPAREN]
-// [178, separated_nonempty_list(COMMA,trait_method_parameter) → • trait_method_parameter COMMA separated_nonempty_list(COMMA,trait_method_parameter), RPAREN]
+// [113, alias_sig → nonempty_list(attribute) PUB pub_attr USING PACKAGE_NAME LBRACE • TYPE uident using_binder RBRACE, EOF / SEMI]
+// [119, alias_sig → nonempty_list(attribute) PUB pub_attr USING PACKAGE_NAME LBRACE • TRAIT uident using_binder RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_117(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_393(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_PACKAGE_NAME => Shift(yy_state_34)
-    T_UIDENT => Shift(yy_state_36)
-    T_ASYNC => Shift(yy_state_37)
-    T_UNDERSCORE => Shift(yy_state_43)
-    T_AMPER => Shift(yy_state_44)
-    NT_qualified_uident_ => Shift(yy_state_46)
-    T_LPAREN => Shift(yy_state_51)
-    NT_simple_type => Shift(yy_state_73)
-    NT_trait_method_parameter => Shift(yy_state_118)
-    T_POST_LABEL => Shift(yy_state_121)
-    NT_post_label => Shift(yy_state_122)
-    NT_type_ => Shift(yy_state_125)
-    NT_separated_nonempty_list_COMMA_trait_method_parameter_ =>
-      Shift(yy_state_126)
-    NT_separated_list_COMMA_trait_method_parameter_ => Shift(yy_state_127)
-    T_RPAREN =>
-      Reduce(0, NT_separated_list_COMMA_trait_method_parameter_, yy_action_137)
+    T_TRAIT => Shift(yy_state_394)
+    T_TYPE => Shift(yy_state_398)
     _ => Error
   }
 }
 
-// [177, separated_nonempty_list(COMMA,trait_method_parameter) → trait_method_parameter •, RPAREN]
-// [178, separated_nonempty_list(COMMA,trait_method_parameter) → trait_method_parameter • COMMA separated_nonempty_list(COMMA,trait_method_parameter), RPAREN]
+// [119, alias_sig → nonempty_list(attribute) PUB pub_attr USING PACKAGE_NAME LBRACE TRAIT • uident using_binder RBRACE, EOF / SEMI]
+// [187, uident → • UIDENT, RBRACE / AS]
 
 ///|
-fn yy_state_118(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_394(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COMMA => Shift(yy_state_119)
-    T_RPAREN =>
-      Reduce(
-        1,
-        NT_separated_nonempty_list_COMMA_trait_method_parameter_,
-        yy_action_136,
-      )
+    T_UIDENT => Shift(yy_state_23)
+    NT_uident => Shift(yy_state_395)
     _ => Error
   }
 }
 
-// [84, simple_type → • simple_type QUESTION, RPAREN / COMMA / QUESTION]
-// [85, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, RPAREN / COMMA / QUESTION]
-// [86, simple_type → • LPAREN type_ RPAREN, RPAREN / COMMA / QUESTION]
-// [87, simple_type → • qualified_uident_ optional_type_arguments, RPAREN / COMMA / QUESTION]
-// [88, simple_type → • AMPER qualified_uident_, RPAREN / COMMA / QUESTION]
-// [89, simple_type → • UNDERSCORE, RPAREN / COMMA / QUESTION]
-// [90, type_ → • simple_type, RPAREN / COMMA]
-// [91, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [92, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [93, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [94, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [95, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [96, type_ → • LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [97, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [98, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [111, trait_method_parameter → • type_, RPAREN / COMMA]
-// [112, trait_method_parameter → • post_label COLON type_, RPAREN / COMMA]
-// [127, qualified_uident_ → • UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
-// [128, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
-// [132, post_label → • POST_LABEL, COLON]
-// [177, separated_nonempty_list(COMMA,trait_method_parameter) → • trait_method_parameter, RPAREN]
-// [178, separated_nonempty_list(COMMA,trait_method_parameter) → • trait_method_parameter COMMA separated_nonempty_list(COMMA,trait_method_parameter), RPAREN]
-// [178, separated_nonempty_list(COMMA,trait_method_parameter) → trait_method_parameter COMMA • separated_nonempty_list(COMMA,trait_method_parameter), RPAREN]
+// [98, using_binder → •, RBRACE]
+// [99, using_binder → • AS uident, RBRACE]
+// [119, alias_sig → nonempty_list(attribute) PUB pub_attr USING PACKAGE_NAME LBRACE TRAIT uident • using_binder RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_119(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_395(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_PACKAGE_NAME => Shift(yy_state_34)
-    T_UIDENT => Shift(yy_state_36)
-    T_ASYNC => Shift(yy_state_37)
-    T_UNDERSCORE => Shift(yy_state_43)
-    T_AMPER => Shift(yy_state_44)
-    NT_qualified_uident_ => Shift(yy_state_46)
-    T_LPAREN => Shift(yy_state_51)
-    NT_simple_type => Shift(yy_state_73)
-    NT_trait_method_parameter => Shift(yy_state_118)
-    NT_separated_nonempty_list_COMMA_trait_method_parameter_ =>
-      Shift(yy_state_120)
-    T_POST_LABEL => Shift(yy_state_121)
-    NT_post_label => Shift(yy_state_122)
-    NT_type_ => Shift(yy_state_125)
+    T_AS => Shift(yy_state_27)
+    NT_using_binder => Shift(yy_state_396)
+    T_RBRACE => Reduce(0, NT_using_binder, yy_action_243)
     _ => Error
   }
 }
 
-// [178, separated_nonempty_list(COMMA,trait_method_parameter) → trait_method_parameter COMMA separated_nonempty_list(COMMA,trait_method_parameter) •, RPAREN]
+// [119, alias_sig → nonempty_list(attribute) PUB pub_attr USING PACKAGE_NAME LBRACE TRAIT uident using_binder • RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_120(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(
-    3,
-    NT_separated_nonempty_list_COMMA_trait_method_parameter_,
-    yy_action_135,
-  )
+fn yy_state_396(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_RBRACE => Shift(yy_state_397)
+    _ => Error
+  }
 }
 
-// [132, post_label → POST_LABEL •, COLON]
+// [119, alias_sig → nonempty_list(attribute) PUB pub_attr USING PACKAGE_NAME LBRACE TRAIT uident using_binder RBRACE •, EOF / SEMI]
 
 ///|
-fn yy_state_121(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_post_label, yy_action_134)
+fn yy_state_397(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(10, NT_alias_sig, yy_action_88)
 }
 
-// [112, trait_method_parameter → post_label • COLON type_, RPAREN / COMMA]
+// [113, alias_sig → nonempty_list(attribute) PUB pub_attr USING PACKAGE_NAME LBRACE TYPE • uident using_binder RBRACE, EOF / SEMI]
+// [187, uident → • UIDENT, RBRACE / AS]
 
 ///|
-fn yy_state_122(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_398(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_123)
+    T_UIDENT => Shift(yy_state_23)
+    NT_uident => Shift(yy_state_399)
     _ => Error
   }
 }
 
-// [84, simple_type → • simple_type QUESTION, RPAREN / COMMA / QUESTION]
-// [85, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, RPAREN / COMMA / QUESTION]
-// [86, simple_type → • LPAREN type_ RPAREN, RPAREN / COMMA / QUESTION]
-// [87, simple_type → • qualified_uident_ optional_type_arguments, RPAREN / COMMA / QUESTION]
-// [88, simple_type → • AMPER qualified_uident_, RPAREN / COMMA / QUESTION]
-// [89, simple_type → • UNDERSCORE, RPAREN / COMMA / QUESTION]
-// [90, type_ → • simple_type, RPAREN / COMMA]
-// [91, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [92, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [93, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [94, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [95, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [96, type_ → • LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [97, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [98, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [112, trait_method_parameter → post_label COLON • type_, RPAREN / COMMA]
-// [127, qualified_uident_ → • UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
-// [128, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
+// [98, using_binder → •, RBRACE]
+// [99, using_binder → • AS uident, RBRACE]
+// [113, alias_sig → nonempty_list(attribute) PUB pub_attr USING PACKAGE_NAME LBRACE TYPE uident • using_binder RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_123(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_399(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_PACKAGE_NAME => Shift(yy_state_34)
-    T_UIDENT => Shift(yy_state_36)
-    T_ASYNC => Shift(yy_state_37)
-    T_UNDERSCORE => Shift(yy_state_43)
-    T_AMPER => Shift(yy_state_44)
-    NT_qualified_uident_ => Shift(yy_state_46)
-    T_LPAREN => Shift(yy_state_51)
-    NT_simple_type => Shift(yy_state_73)
-    NT_type_ => Shift(yy_state_124)
+    T_AS => Shift(yy_state_27)
+    NT_using_binder => Shift(yy_state_400)
+    T_RBRACE => Reduce(0, NT_using_binder, yy_action_243)
     _ => Error
   }
 }
 
-// [112, trait_method_parameter → post_label COLON type_ •, RPAREN / COMMA]
+// [113, alias_sig → nonempty_list(attribute) PUB pub_attr USING PACKAGE_NAME LBRACE TYPE uident using_binder • RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_124(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_trait_method_parameter, yy_action_133)
+fn yy_state_400(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_RBRACE => Shift(yy_state_401)
+    _ => Error
+  }
 }
 
-// [111, trait_method_parameter → type_ •, RPAREN / COMMA]
+// [113, alias_sig → nonempty_list(attribute) PUB pub_attr USING PACKAGE_NAME LBRACE TYPE uident using_binder RBRACE •, EOF / SEMI]
 
 ///|
-fn yy_state_125(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_trait_method_parameter, yy_action_132)
+fn yy_state_401(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(10, NT_alias_sig, yy_action_87)
 }
 
-// [142, separated_list(COMMA,trait_method_parameter) → separated_nonempty_list(COMMA,trait_method_parameter) •, RPAREN]
+// [91, trait_sig → nonempty_list(attribute) PUB pub_attr TRAIT • uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
+// [97, trait_sig → nonempty_list(attribute) PUB pub_attr TRAIT • uident, EOF / SEMI]
+// [187, uident → • UIDENT, EOF / COLON / SEMI / LBRACE]
 
 ///|
-fn yy_state_126(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(
-    1,
-    NT_separated_list_COMMA_trait_method_parameter_,
-    yy_action_131,
-  )
+fn yy_state_402(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_UIDENT => Shift(yy_state_23)
+    NT_uident => Shift(yy_state_403)
+    _ => Error
+  }
 }
 
-// [24, trait_method_sig → lident LPAREN separated_list(COMMA,trait_method_parameter) • RPAREN THIN_ARROW return_type boption(eq_underscore), SEMI / RBRACE]
+// [91, trait_sig → nonempty_list(attribute) PUB pub_attr TRAIT uident • loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
+// [97, trait_sig → nonempty_list(attribute) PUB pub_attr TRAIT uident •, EOF / SEMI]
+// [209, loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) → •, LBRACE]
+// [210, loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) → • COLON separated_nonempty_list(PLUS,qualified_uident), LBRACE]
 
 ///|
-fn yy_state_127(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_403(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RPAREN => Shift(yy_state_128)
+    T_COLON => Shift(yy_state_40)
+    NT_loption_preceded_COLON_separated_nonempty_list_PLUS_qualified_uident___ =>
+      Shift(yy_state_404)
+    T_LBRACE =>
+      Reduce(
+        0,
+        NT_loption_preceded_COLON_separated_nonempty_list_PLUS_qualified_uident___,
+        yy_action_236,
+      )
+    T_EOF | T_SEMI => Reduce(5, NT_trait_sig, yy_action_86)
     _ => Error
   }
 }
 
-// [24, trait_method_sig → lident LPAREN separated_list(COMMA,trait_method_parameter) RPAREN • THIN_ARROW return_type boption(eq_underscore), SEMI / RBRACE]
+// [91, trait_sig → nonempty_list(attribute) PUB pub_attr TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) • LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_128(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_404(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_THIN_ARROW => Shift(yy_state_129)
+    T_LBRACE => Shift(yy_state_405)
     _ => Error
   }
 }
 
-// [24, trait_method_sig → lident LPAREN separated_list(COMMA,trait_method_parameter) RPAREN THIN_ARROW • return_type boption(eq_underscore), SEMI / RBRACE]
-// [84, simple_type → • simple_type QUESTION, RAISE / EQUAL / QUESTION / SEMI / RBRACE]
-// [85, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, RAISE / EQUAL / QUESTION / SEMI / RBRACE]
-// [86, simple_type → • LPAREN type_ RPAREN, RAISE / EQUAL / QUESTION / SEMI / RBRACE]
-// [87, simple_type → • qualified_uident_ optional_type_arguments, RAISE / EQUAL / QUESTION / SEMI / RBRACE]
-// [88, simple_type → • AMPER qualified_uident_, RAISE / EQUAL / QUESTION / SEMI / RBRACE]
-// [89, simple_type → • UNDERSCORE, RAISE / EQUAL / QUESTION / SEMI / RBRACE]
-// [90, type_ → • simple_type, EQUAL / SEMI / RBRACE]
-// [91, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EQUAL / SEMI / RBRACE]
-// [92, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EQUAL / SEMI / RBRACE]
-// [93, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EQUAL / SEMI / RBRACE]
-// [94, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EQUAL / SEMI / RBRACE]
-// [95, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EQUAL / SEMI / RBRACE]
-// [96, type_ → • LPAREN RPAREN THIN_ARROW return_type, EQUAL / SEMI / RBRACE]
-// [97, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EQUAL / SEMI / RBRACE]
-// [98, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EQUAL / SEMI / RBRACE]
-// [99, return_type → • type_, EQUAL / SEMI / RBRACE]
-// [100, return_type → • simple_type RAISE, EQUAL / SEMI / RBRACE]
-// [101, return_type → • simple_type RAISE error_type, EQUAL / SEMI / RBRACE]
-// [102, return_type → • simple_type RAISE QUESTION, EQUAL / SEMI / RBRACE]
-// [127, qualified_uident_ → • UIDENT, RAISE / EQUAL / QUESTION / SEMI / LBRACKET / RBRACE]
-// [128, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, RAISE / EQUAL / QUESTION / SEMI / LBRACKET / RBRACE]
+// [36, trait_method_sig → • lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type boption(eq_underscore), SEMI / RBRACE]
+// [37, trait_method_sig → • nonempty_list(attribute) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type boption(eq_underscore), SEMI / RBRACE]
+// [91, trait_sig → nonempty_list(attribute) PUB pub_attr TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE • separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
+// [188, lident → • LIDENT, LPAREN]
+// [211, separated_nonempty_list(SEMI,trait_method_sig) → • trait_method_sig, RBRACE]
+// [212, separated_nonempty_list(SEMI,trait_method_sig) → • trait_method_sig SEMI separated_nonempty_list(SEMI,trait_method_sig), RBRACE]
+// [229, nonempty_list(attribute) → • ATTRIBUTE, LIDENT]
+// [230, nonempty_list(attribute) → • ATTRIBUTE nonempty_list(attribute), LIDENT]
 
 ///|
-fn yy_state_129(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_405(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_PACKAGE_NAME => Shift(yy_state_34)
-    T_UIDENT => Shift(yy_state_36)
-    T_ASYNC => Shift(yy_state_37)
-    NT_type_ => Shift(yy_state_41)
-    T_UNDERSCORE => Shift(yy_state_43)
-    T_AMPER => Shift(yy_state_44)
-    NT_qualified_uident_ => Shift(yy_state_46)
-    T_LPAREN => Shift(yy_state_51)
-    NT_simple_type => Shift(yy_state_55)
-    NT_return_type => Shift(yy_state_130)
+    T_ATTRIBUTE => Shift(yy_state_17)
+    T_LIDENT => Shift(yy_state_36)
+    NT_trait_method_sig => Shift(yy_state_50)
+    NT_nonempty_list_attribute_ => Shift(yy_state_53)
+    NT_lident => Shift(yy_state_132)
+    NT_separated_nonempty_list_SEMI_trait_method_sig_ => Shift(yy_state_406)
     _ => Error
   }
 }
 
-// [24, trait_method_sig → lident LPAREN separated_list(COMMA,trait_method_parameter) RPAREN THIN_ARROW return_type • boption(eq_underscore), SEMI / RBRACE]
-// [143, boption(eq_underscore) → •, SEMI / RBRACE]
-// [144, boption(eq_underscore) → • EQUAL UNDERSCORE, SEMI / RBRACE]
+// [91, trait_sig → nonempty_list(attribute) PUB pub_attr TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) • RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_130(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_406(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_EQUAL => Shift(yy_state_131)
-    NT_boption_eq_underscore_ => Shift(yy_state_133)
-    T_SEMI | T_RBRACE => Reduce(0, NT_boption_eq_underscore_, yy_action_130)
+    T_RBRACE => Shift(yy_state_407)
     _ => Error
   }
 }
 
-// [144, boption(eq_underscore) → EQUAL • UNDERSCORE, SEMI / RBRACE]
+// [91, trait_sig → nonempty_list(attribute) PUB pub_attr TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE •, EOF / SEMI]
 
 ///|
-fn yy_state_131(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_407(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(9, NT_trait_sig, yy_action_85)
+}
+
+// [79, impl_sig → nonempty_list(attribute) PUB pub_attr IMPL • type_params_with_constraints qualified_uident FOR type_, EOF / SEMI]
+// [85, impl_sig → nonempty_list(attribute) PUB pub_attr IMPL • qualified_uident FOR type_, EOF / SEMI]
+// [138, type_params_with_constraints → • LBRACKET separated_list(COMMA,type_param_with_constraints) RBRACKET, UIDENT / PACKAGE_NAME]
+// [183, qualified_uident → • UIDENT, FOR]
+// [184, qualified_uident → • PACKAGE_NAME DOT_UIDENT, FOR]
+
+///|
+fn yy_state_408(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UNDERSCORE => Shift(yy_state_132)
+    T_PACKAGE_NAME => Shift(yy_state_45)
+    T_UIDENT => Shift(yy_state_47)
+    T_LBRACKET => Shift(yy_state_142)
+    NT_qualified_uident => Shift(yy_state_409)
+    NT_type_params_with_constraints => Shift(yy_state_412)
     _ => Error
   }
 }
 
-// [144, boption(eq_underscore) → EQUAL UNDERSCORE •, SEMI / RBRACE]
+// [85, impl_sig → nonempty_list(attribute) PUB pub_attr IMPL qualified_uident • FOR type_, EOF / SEMI]
 
 ///|
-fn yy_state_132(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_boption_eq_underscore_, yy_action_128)
+fn yy_state_409(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_FOR => Shift(yy_state_410)
+    _ => Error
+  }
+}
+
+// [85, impl_sig → nonempty_list(attribute) PUB pub_attr IMPL qualified_uident FOR • type_, EOF / SEMI]
+// [146, simple_type → • simple_type QUESTION, EOF / QUESTION / SEMI]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EOF / QUESTION / SEMI]
+// [148, simple_type → • LPAREN type_ RPAREN, EOF / QUESTION / SEMI]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, EOF / QUESTION / SEMI]
+// [150, simple_type → • AMPER qualified_uident_, EOF / QUESTION / SEMI]
+// [151, simple_type → • UNDERSCORE, EOF / QUESTION / SEMI]
+// [152, type_ → • simple_type, EOF / SEMI]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [185, qualified_uident_ → • UIDENT, EOF / QUESTION / SEMI / LBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EOF / QUESTION / SEMI / LBRACKET]
+
+///|
+fn yy_state_410(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_104)
+    NT_type_ => Shift(yy_state_411)
+    _ => Error
+  }
 }
 
-// [24, trait_method_sig → lident LPAREN separated_list(COMMA,trait_method_parameter) RPAREN THIN_ARROW return_type boption(eq_underscore) •, SEMI / RBRACE]
+// [85, impl_sig → nonempty_list(attribute) PUB pub_attr IMPL qualified_uident FOR type_ •, EOF / SEMI]
 
 ///|
-fn yy_state_133(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(7, NT_trait_method_sig, yy_action_126)
+fn yy_state_411(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(7, NT_impl_sig, yy_action_84)
 }
 
-// [55, trait_sig → TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) • RBRACE, EOF / SEMI]
+// [79, impl_sig → nonempty_list(attribute) PUB pub_attr IMPL type_params_with_constraints • qualified_uident FOR type_, EOF / SEMI]
+// [183, qualified_uident → • UIDENT, FOR]
+// [184, qualified_uident → • PACKAGE_NAME DOT_UIDENT, FOR]
 
 ///|
-fn yy_state_134(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_412(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RBRACE => Shift(yy_state_135)
+    T_PACKAGE_NAME => Shift(yy_state_45)
+    T_UIDENT => Shift(yy_state_47)
+    NT_qualified_uident => Shift(yy_state_413)
     _ => Error
   }
 }
 
-// [55, trait_sig → TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE •, EOF / SEMI]
+// [79, impl_sig → nonempty_list(attribute) PUB pub_attr IMPL type_params_with_constraints qualified_uident • FOR type_, EOF / SEMI]
 
 ///|
-fn yy_state_135(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(6, NT_trait_sig, yy_action_125)
+fn yy_state_413(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_FOR => Shift(yy_state_414)
+    _ => Error
+  }
 }
 
-// [52, impl_sig → IMPL • type_params_with_constraints qualified_uident FOR type_, EOF / SEMI]
-// [53, impl_sig → IMPL • qualified_uident FOR type_, EOF / SEMI]
-// [54, impl_sig → IMPL • uident COLONCOLON lident, EOF / SEMI]
-// [76, type_params_with_constraints → • LBRACKET separated_list(COMMA,type_param_with_constraints) RBRACKET, UIDENT / PACKAGE_NAME]
-// [125, qualified_uident → • UIDENT, FOR]
-// [126, qualified_uident → • PACKAGE_NAME DOT_UIDENT, FOR]
-// [129, uident → • UIDENT, COLONCOLON]
-
-///|
-fn yy_state_136(_lookahead : YYSymbol) -> YYDecision {
+// [79, impl_sig → nonempty_list(attribute) PUB pub_attr IMPL type_params_with_constraints qualified_uident FOR • type_, EOF / SEMI]
+// [146, simple_type → • simple_type QUESTION, EOF / QUESTION / SEMI]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EOF / QUESTION / SEMI]
+// [148, simple_type → • LPAREN type_ RPAREN, EOF / QUESTION / SEMI]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, EOF / QUESTION / SEMI]
+// [150, simple_type → • AMPER qualified_uident_, EOF / QUESTION / SEMI]
+// [151, simple_type → • UNDERSCORE, EOF / QUESTION / SEMI]
+// [152, type_ → • simple_type, EOF / SEMI]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [185, qualified_uident_ → • UIDENT, EOF / QUESTION / SEMI / LBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EOF / QUESTION / SEMI / LBRACKET]
+
+///|
+fn yy_state_414(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_PACKAGE_NAME => Shift(yy_state_21)
-    T_UIDENT => Shift(yy_state_137)
-    T_LBRACKET => Shift(yy_state_138)
-    NT_uident => Shift(yy_state_152)
-    NT_qualified_uident => Shift(yy_state_155)
-    NT_type_params_with_constraints => Shift(yy_state_158)
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_104)
+    NT_type_ => Shift(yy_state_415)
     _ => Error
   }
 }
 
-// [125, qualified_uident → UIDENT •, FOR]
-// [129, uident → UIDENT •, COLONCOLON]
+// [79, impl_sig → nonempty_list(attribute) PUB pub_attr IMPL type_params_with_constraints qualified_uident FOR type_ •, EOF / SEMI]
 
 ///|
-fn yy_state_137(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_415(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(8, NT_impl_sig, yy_action_83)
+}
+
+// [73, type_sig → nonempty_list(attribute) PUB pub_attr ENUM • type_decl_name_with_params LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [145, type_decl_name_with_params → • uident optional_type_params_no_constraints, LBRACE]
+// [187, uident → • UIDENT, LBRACKET / LBRACE]
+
+///|
+fn yy_state_416(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_FOR => Reduce(1, NT_qualified_uident, yy_action_192)
-    T_COLONCOLON => Reduce(1, NT_uident, yy_action_189)
+    T_UIDENT => Shift(yy_state_23)
+    NT_uident => Shift(yy_state_164)
+    NT_type_decl_name_with_params => Shift(yy_state_417)
     _ => Error
   }
 }
 
-// [74, type_param_with_constraints → • uident, COMMA / RBRACKET]
-// [75, type_param_with_constraints → • uident COLON separated_nonempty_list(PLUS,type_constraint), COMMA / RBRACKET]
-// [76, type_params_with_constraints → LBRACKET • separated_list(COMMA,type_param_with_constraints) RBRACKET, LIDENT / UIDENT / PACKAGE_NAME]
-// [129, uident → • UIDENT, COMMA / COLON / RBRACKET]
-// [167, separated_list(COMMA,type_param_with_constraints) → •, RBRACKET]
-// [168, separated_list(COMMA,type_param_with_constraints) → • separated_nonempty_list(COMMA,type_param_with_constraints), RBRACKET]
-// [183, separated_nonempty_list(COMMA,type_param_with_constraints) → • type_param_with_constraints, RBRACKET]
-// [184, separated_nonempty_list(COMMA,type_param_with_constraints) → • type_param_with_constraints COMMA separated_nonempty_list(COMMA,type_param_with_constraints), RBRACKET]
+// [73, type_sig → nonempty_list(attribute) PUB pub_attr ENUM type_decl_name_with_params • LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_138(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_417(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_31)
-    NT_type_param_with_constraints => Shift(yy_state_139)
-    NT_uident => Shift(yy_state_142)
-    NT_separated_nonempty_list_COMMA_type_param_with_constraints_ =>
-      Shift(yy_state_149)
-    NT_separated_list_COMMA_type_param_with_constraints_ => Shift(yy_state_150)
-    T_RBRACKET =>
-      Reduce(
-        0,
-        NT_separated_list_COMMA_type_param_with_constraints_,
-        yy_action_124,
-      )
+    T_LBRACE => Shift(yy_state_418)
     _ => Error
   }
 }
 
-// [183, separated_nonempty_list(COMMA,type_param_with_constraints) → type_param_with_constraints •, RBRACKET]
-// [184, separated_nonempty_list(COMMA,type_param_with_constraints) → type_param_with_constraints • COMMA separated_nonempty_list(COMMA,type_param_with_constraints), RBRACKET]
+// [73, type_sig → nonempty_list(attribute) PUB pub_attr ENUM type_decl_name_with_params LBRACE • separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [120, enum_constructor → • UIDENT option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) option(eq_tag), SEMI / RBRACE]
+// [121, enum_constructor → • nonempty_list(attribute) UIDENT option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) option(eq_tag), SEMI / RBRACE]
+// [203, separated_list(SEMI,enum_constructor) → •, RBRACE]
+// [204, separated_list(SEMI,enum_constructor) → • separated_nonempty_list(SEMI,enum_constructor), RBRACE]
+// [229, nonempty_list(attribute) → • ATTRIBUTE, UIDENT]
+// [230, nonempty_list(attribute) → • ATTRIBUTE nonempty_list(attribute), UIDENT]
+// [233, separated_nonempty_list(SEMI,enum_constructor) → • enum_constructor, RBRACE]
+// [234, separated_nonempty_list(SEMI,enum_constructor) → • enum_constructor SEMI separated_nonempty_list(SEMI,enum_constructor), RBRACE]
 
 ///|
-fn yy_state_139(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_418(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COMMA => Shift(yy_state_140)
-    T_RBRACKET =>
-      Reduce(
-        1,
-        NT_separated_nonempty_list_COMMA_type_param_with_constraints_,
-        yy_action_123,
-      )
+    T_ATTRIBUTE => Shift(yy_state_17)
+    NT_enum_constructor => Shift(yy_state_178)
+    NT_nonempty_list_attribute_ => Shift(yy_state_181)
+    T_UIDENT => Shift(yy_state_199)
+    NT_separated_nonempty_list_SEMI_enum_constructor_ => Shift(yy_state_202)
+    NT_separated_list_SEMI_enum_constructor_ => Shift(yy_state_419)
+    T_RBRACE =>
+      Reduce(0, NT_separated_list_SEMI_enum_constructor_, yy_action_161)
     _ => Error
   }
 }
 
-// [74, type_param_with_constraints → • uident, COMMA / RBRACKET]
-// [75, type_param_with_constraints → • uident COLON separated_nonempty_list(PLUS,type_constraint), COMMA / RBRACKET]
-// [129, uident → • UIDENT, COMMA / COLON / RBRACKET]
-// [183, separated_nonempty_list(COMMA,type_param_with_constraints) → • type_param_with_constraints, RBRACKET]
-// [184, separated_nonempty_list(COMMA,type_param_with_constraints) → • type_param_with_constraints COMMA separated_nonempty_list(COMMA,type_param_with_constraints), RBRACKET]
-// [184, separated_nonempty_list(COMMA,type_param_with_constraints) → type_param_with_constraints COMMA • separated_nonempty_list(COMMA,type_param_with_constraints), RBRACKET]
+// [73, type_sig → nonempty_list(attribute) PUB pub_attr ENUM type_decl_name_with_params LBRACE separated_list(SEMI,enum_constructor) • RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_140(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_419(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_31)
-    NT_type_param_with_constraints => Shift(yy_state_139)
-    NT_separated_nonempty_list_COMMA_type_param_with_constraints_ =>
-      Shift(yy_state_141)
-    NT_uident => Shift(yy_state_142)
+    T_RBRACE => Shift(yy_state_420)
     _ => Error
   }
 }
 
-// [184, separated_nonempty_list(COMMA,type_param_with_constraints) → type_param_with_constraints COMMA separated_nonempty_list(COMMA,type_param_with_constraints) •, RBRACKET]
+// [73, type_sig → nonempty_list(attribute) PUB pub_attr ENUM type_decl_name_with_params LBRACE separated_list(SEMI,enum_constructor) RBRACE •, EOF / SEMI]
 
 ///|
-fn yy_state_141(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(
-    3,
-    NT_separated_nonempty_list_COMMA_type_param_with_constraints_,
-    yy_action_122,
-  )
+fn yy_state_420(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(8, NT_type_sig, yy_action_82)
 }
 
-// [74, type_param_with_constraints → uident •, COMMA / RBRACKET]
-// [75, type_param_with_constraints → uident • COLON separated_nonempty_list(PLUS,type_constraint), COMMA / RBRACKET]
+// [61, type_sig → nonempty_list(attribute) PUB pub_attr STRUCT • type_decl_name_with_params LBRACE record_decl_body RBRACE, EOF / SEMI]
+// [67, type_sig → nonempty_list(attribute) PUB pub_attr STRUCT • type_decl_name_with_params LPAREN separated_list(COMMA,type_) RPAREN, EOF / SEMI]
+// [145, type_decl_name_with_params → • uident optional_type_params_no_constraints, LPAREN / LBRACE]
+// [187, uident → • UIDENT, LPAREN / LBRACKET / LBRACE]
 
 ///|
-fn yy_state_142(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_421(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_143)
-    T_COMMA | T_RBRACKET =>
-      Reduce(1, NT_type_param_with_constraints, yy_action_121)
+    T_UIDENT => Shift(yy_state_23)
+    NT_uident => Shift(yy_state_164)
+    NT_type_decl_name_with_params => Shift(yy_state_422)
     _ => Error
   }
 }
 
-// [75, type_param_with_constraints → uident COLON • separated_nonempty_list(PLUS,type_constraint), COMMA / RBRACKET]
-// [82, type_constraint → • qualified_uident, COMMA / PLUS / RBRACKET]
-// [125, qualified_uident → • UIDENT, COMMA / PLUS / RBRACKET]
-// [126, qualified_uident → • PACKAGE_NAME DOT_UIDENT, COMMA / PLUS / RBRACKET]
-// [165, separated_nonempty_list(PLUS,type_constraint) → • type_constraint, COMMA / RBRACKET]
-// [166, separated_nonempty_list(PLUS,type_constraint) → • type_constraint PLUS separated_nonempty_list(PLUS,type_constraint), COMMA / RBRACKET]
+// [61, type_sig → nonempty_list(attribute) PUB pub_attr STRUCT type_decl_name_with_params • LBRACE record_decl_body RBRACE, EOF / SEMI]
+// [67, type_sig → nonempty_list(attribute) PUB pub_attr STRUCT type_decl_name_with_params • LPAREN separated_list(COMMA,type_) RPAREN, EOF / SEMI]
 
 ///|
-fn yy_state_143(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_422(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_PACKAGE_NAME => Shift(yy_state_21)
-    T_UIDENT => Shift(yy_state_23)
-    NT_type_constraint => Shift(yy_state_144)
-    NT_qualified_uident => Shift(yy_state_147)
-    NT_separated_nonempty_list_PLUS_type_constraint_ => Shift(yy_state_148)
+    T_LPAREN => Shift(yy_state_423)
+    T_LBRACE => Shift(yy_state_426)
     _ => Error
   }
 }
 
-// [165, separated_nonempty_list(PLUS,type_constraint) → type_constraint •, COMMA / RBRACKET]
-// [166, separated_nonempty_list(PLUS,type_constraint) → type_constraint • PLUS separated_nonempty_list(PLUS,type_constraint), COMMA / RBRACKET]
-
-///|
-fn yy_state_144(_lookahead : YYSymbol) -> YYDecision {
+// [67, type_sig → nonempty_list(attribute) PUB pub_attr STRUCT type_decl_name_with_params LPAREN • separated_list(COMMA,type_) RPAREN, EOF / SEMI]
+// [146, simple_type → • simple_type QUESTION, RPAREN / COMMA / QUESTION]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, RPAREN / COMMA / QUESTION]
+// [148, simple_type → • LPAREN type_ RPAREN, RPAREN / COMMA / QUESTION]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, RPAREN / COMMA / QUESTION]
+// [150, simple_type → • AMPER qualified_uident_, RPAREN / COMMA / QUESTION]
+// [151, simple_type → • UNDERSCORE, RPAREN / COMMA / QUESTION]
+// [152, type_ → • simple_type, RPAREN / COMMA]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [185, qualified_uident_ → • UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
+// [205, separated_list(COMMA,type_) → •, RPAREN]
+// [206, separated_list(COMMA,type_) → • separated_nonempty_list(COMMA,type_), RPAREN]
+// [227, separated_nonempty_list(COMMA,type_) → • type_, RPAREN]
+// [228, separated_nonempty_list(COMMA,type_) → • type_ COMMA separated_nonempty_list(COMMA,type_), RPAREN]
+
+///|
+fn yy_state_423(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_PLUS => Shift(yy_state_145)
-    T_COMMA | T_RBRACKET =>
-      Reduce(1, NT_separated_nonempty_list_PLUS_type_constraint_, yy_action_120)
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    NT_type_ => Shift(yy_state_79)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_104)
+    NT_separated_nonempty_list_COMMA_type__ => Shift(yy_state_208)
+    NT_separated_list_COMMA_type__ => Shift(yy_state_424)
+    T_RPAREN => Reduce(0, NT_separated_list_COMMA_type__, yy_action_142)
     _ => Error
   }
 }
 
-// [82, type_constraint → • qualified_uident, COMMA / PLUS / RBRACKET]
-// [125, qualified_uident → • UIDENT, COMMA / PLUS / RBRACKET]
-// [126, qualified_uident → • PACKAGE_NAME DOT_UIDENT, COMMA / PLUS / RBRACKET]
-// [165, separated_nonempty_list(PLUS,type_constraint) → • type_constraint, COMMA / RBRACKET]
-// [166, separated_nonempty_list(PLUS,type_constraint) → • type_constraint PLUS separated_nonempty_list(PLUS,type_constraint), COMMA / RBRACKET]
-// [166, separated_nonempty_list(PLUS,type_constraint) → type_constraint PLUS • separated_nonempty_list(PLUS,type_constraint), COMMA / RBRACKET]
+// [67, type_sig → nonempty_list(attribute) PUB pub_attr STRUCT type_decl_name_with_params LPAREN separated_list(COMMA,type_) • RPAREN, EOF / SEMI]
 
 ///|
-fn yy_state_145(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_424(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_PACKAGE_NAME => Shift(yy_state_21)
-    T_UIDENT => Shift(yy_state_23)
-    NT_type_constraint => Shift(yy_state_144)
-    NT_separated_nonempty_list_PLUS_type_constraint_ => Shift(yy_state_146)
-    NT_qualified_uident => Shift(yy_state_147)
+    T_RPAREN => Shift(yy_state_425)
     _ => Error
   }
 }
 
-// [166, separated_nonempty_list(PLUS,type_constraint) → type_constraint PLUS separated_nonempty_list(PLUS,type_constraint) •, COMMA / RBRACKET]
+// [67, type_sig → nonempty_list(attribute) PUB pub_attr STRUCT type_decl_name_with_params LPAREN separated_list(COMMA,type_) RPAREN •, EOF / SEMI]
 
 ///|
-fn yy_state_146(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(
-    3,
-    NT_separated_nonempty_list_PLUS_type_constraint_,
-    yy_action_119,
-  )
+fn yy_state_425(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(8, NT_type_sig, yy_action_81)
 }
 
-// [82, type_constraint → qualified_uident •, COMMA / PLUS / RBRACKET]
+// [61, type_sig → nonempty_list(attribute) PUB pub_attr STRUCT type_decl_name_with_params LBRACE • record_decl_body RBRACE, EOF / SEMI]
+// [124, record_decl_field → • boption(MUTABLE) LIDENT COLON type_, SEMI / RBRACE]
+// [125, record_decl_field → • nonempty_list(attribute) boption(MUTABLE) LIDENT COLON type_, SEMI / RBRACE]
+// [126, record_decl_constr → • ASYNC FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, RBRACE]
+// [127, record_decl_constr → • FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, RBRACE]
+// [128, record_decl_constr → • nonempty_list(attribute) ASYNC FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, RBRACE]
+// [129, record_decl_constr → • nonempty_list(attribute) FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, RBRACE]
+// [130, record_decl_body → •, RBRACE]
+// [131, record_decl_body → • record_decl_constr, RBRACE]
+// [132, record_decl_body → • record_decl_body_nonempty, RBRACE]
+// [133, record_decl_body_nonempty → • record_decl_field SEMI record_decl_constr, RBRACE]
+// [134, record_decl_body_nonempty → • record_decl_field, RBRACE]
+// [135, record_decl_body_nonempty → • record_decl_field SEMI record_decl_body_nonempty, RBRACE]
+// [219, boption(MUTABLE) → •, LIDENT]
+// [220, boption(MUTABLE) → • MUTABLE, LIDENT]
+// [229, nonempty_list(attribute) → • ATTRIBUTE, LIDENT / ASYNC / FN / MUTABLE]
+// [230, nonempty_list(attribute) → • ATTRIBUTE nonempty_list(attribute), LIDENT / ASYNC / FN / MUTABLE]
 
 ///|
-fn yy_state_147(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_type_constraint, yy_action_118)
+fn yy_state_426(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_ATTRIBUTE => Shift(yy_state_17)
+    T_MUTABLE => Shift(yy_state_184)
+    NT_record_decl_field => Shift(yy_state_212)
+    T_FN => Shift(yy_state_216)
+    T_ASYNC => Shift(yy_state_232)
+    NT_nonempty_list_attribute_ => Shift(yy_state_242)
+    NT_boption_MUTABLE_ => Shift(yy_state_266)
+    NT_record_decl_body_nonempty => Shift(yy_state_270)
+    NT_record_decl_constr => Shift(yy_state_271)
+    NT_record_decl_body => Shift(yy_state_427)
+    T_RBRACE => Reduce(0, NT_record_decl_body, yy_action_139)
+    T_LIDENT => Reduce(0, NT_boption_MUTABLE_, yy_action_157)
+    _ => Error
+  }
 }
 
-// [75, type_param_with_constraints → uident COLON separated_nonempty_list(PLUS,type_constraint) •, COMMA / RBRACKET]
+// [61, type_sig → nonempty_list(attribute) PUB pub_attr STRUCT type_decl_name_with_params LBRACE record_decl_body • RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_148(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_type_param_with_constraints, yy_action_117)
+fn yy_state_427(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_RBRACE => Shift(yy_state_428)
+    _ => Error
+  }
 }
 
-// [168, separated_list(COMMA,type_param_with_constraints) → separated_nonempty_list(COMMA,type_param_with_constraints) •, RBRACKET]
+// [61, type_sig → nonempty_list(attribute) PUB pub_attr STRUCT type_decl_name_with_params LBRACE record_decl_body RBRACE •, EOF / SEMI]
 
 ///|
-fn yy_state_149(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(
-    1,
-    NT_separated_list_COMMA_type_param_with_constraints_,
-    yy_action_116,
-  )
+fn yy_state_428(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(8, NT_type_sig, yy_action_80)
 }
 
-// [76, type_params_with_constraints → LBRACKET separated_list(COMMA,type_param_with_constraints) • RBRACKET, LIDENT / UIDENT / PACKAGE_NAME]
+// [49, type_sig → nonempty_list(attribute) PUB pub_attr SUBERROR • uident option(type_), EOF / SEMI]
+// [55, type_sig → nonempty_list(attribute) PUB pub_attr SUBERROR • uident LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [187, uident → • UIDENT, UIDENT / EOF / ASYNC / LPAREN / SEMI / UNDERSCORE / LBRACE / AMPER / PACKAGE_NAME]
 
 ///|
-fn yy_state_150(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_429(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RBRACKET => Shift(yy_state_151)
+    T_UIDENT => Shift(yy_state_23)
+    NT_uident => Shift(yy_state_430)
     _ => Error
   }
 }
 
-// [76, type_params_with_constraints → LBRACKET separated_list(COMMA,type_param_with_constraints) RBRACKET •, LIDENT / UIDENT / PACKAGE_NAME]
-
-///|
-fn yy_state_151(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_type_params_with_constraints, yy_action_115)
+// [49, type_sig → nonempty_list(attribute) PUB pub_attr SUBERROR uident • option(type_), EOF / SEMI]
+// [55, type_sig → nonempty_list(attribute) PUB pub_attr SUBERROR uident • LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [146, simple_type → • simple_type QUESTION, EOF / QUESTION / SEMI]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EOF / QUESTION / SEMI]
+// [148, simple_type → • LPAREN type_ RPAREN, EOF / QUESTION / SEMI]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, EOF / QUESTION / SEMI]
+// [150, simple_type → • AMPER qualified_uident_, EOF / QUESTION / SEMI]
+// [151, simple_type → • UNDERSCORE, EOF / QUESTION / SEMI]
+// [152, type_ → • simple_type, EOF / SEMI]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [185, qualified_uident_ → • UIDENT, EOF / QUESTION / SEMI / LBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EOF / QUESTION / SEMI / LBRACKET]
+// [201, option(type_) → •, EOF / SEMI]
+// [202, option(type_) → • type_, EOF / SEMI]
+
+///|
+fn yy_state_430(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_104)
+    NT_type_ => Shift(yy_state_276)
+    T_LBRACE => Shift(yy_state_431)
+    NT_option_type__ => Shift(yy_state_434)
+    T_EOF | T_SEMI => Reduce(0, NT_option_type__, yy_action_120)
+    _ => Error
+  }
 }
 
-// [54, impl_sig → IMPL uident • COLONCOLON lident, EOF / SEMI]
+// [55, type_sig → nonempty_list(attribute) PUB pub_attr SUBERROR uident LBRACE • separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [120, enum_constructor → • UIDENT option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) option(eq_tag), SEMI / RBRACE]
+// [121, enum_constructor → • nonempty_list(attribute) UIDENT option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) option(eq_tag), SEMI / RBRACE]
+// [203, separated_list(SEMI,enum_constructor) → •, RBRACE]
+// [204, separated_list(SEMI,enum_constructor) → • separated_nonempty_list(SEMI,enum_constructor), RBRACE]
+// [229, nonempty_list(attribute) → • ATTRIBUTE, UIDENT]
+// [230, nonempty_list(attribute) → • ATTRIBUTE nonempty_list(attribute), UIDENT]
+// [233, separated_nonempty_list(SEMI,enum_constructor) → • enum_constructor, RBRACE]
+// [234, separated_nonempty_list(SEMI,enum_constructor) → • enum_constructor SEMI separated_nonempty_list(SEMI,enum_constructor), RBRACE]
 
 ///|
-fn yy_state_152(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_431(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLONCOLON => Shift(yy_state_153)
+    T_ATTRIBUTE => Shift(yy_state_17)
+    NT_enum_constructor => Shift(yy_state_178)
+    NT_nonempty_list_attribute_ => Shift(yy_state_181)
+    T_UIDENT => Shift(yy_state_199)
+    NT_separated_nonempty_list_SEMI_enum_constructor_ => Shift(yy_state_202)
+    NT_separated_list_SEMI_enum_constructor_ => Shift(yy_state_432)
+    T_RBRACE =>
+      Reduce(0, NT_separated_list_SEMI_enum_constructor_, yy_action_161)
     _ => Error
   }
 }
 
-// [54, impl_sig → IMPL uident COLONCOLON • lident, EOF / SEMI]
-// [130, lident → • LIDENT, EOF / SEMI]
+// [55, type_sig → nonempty_list(attribute) PUB pub_attr SUBERROR uident LBRACE separated_list(SEMI,enum_constructor) • RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_153(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_432(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LIDENT => Shift(yy_state_26)
-    NT_lident => Shift(yy_state_154)
+    T_RBRACE => Shift(yy_state_433)
     _ => Error
   }
 }
 
-// [54, impl_sig → IMPL uident COLONCOLON lident •, EOF / SEMI]
+// [55, type_sig → nonempty_list(attribute) PUB pub_attr SUBERROR uident LBRACE separated_list(SEMI,enum_constructor) RBRACE •, EOF / SEMI]
 
 ///|
-fn yy_state_154(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(4, NT_impl_sig, yy_action_114)
+fn yy_state_433(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(8, NT_type_sig, yy_action_79)
 }
 
-// [53, impl_sig → IMPL qualified_uident • FOR type_, EOF / SEMI]
+// [49, type_sig → nonempty_list(attribute) PUB pub_attr SUBERROR uident option(type_) •, EOF / SEMI]
 
 ///|
-fn yy_state_155(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_434(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(6, NT_type_sig, yy_action_78)
+}
+
+// [43, type_sig → nonempty_list(attribute) PUB pub_attr TYPE • type_decl_name_with_params, EOF / SEMI]
+// [105, alias_sig → nonempty_list(attribute) PUB pub_attr TYPE • type_decl_name_with_params EQUAL type_, EOF / SEMI]
+// [145, type_decl_name_with_params → • uident optional_type_params_no_constraints, EOF / EQUAL / SEMI]
+// [187, uident → • UIDENT, EOF / EQUAL / SEMI / LBRACKET]
+
+///|
+fn yy_state_435(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_FOR => Shift(yy_state_156)
+    T_UIDENT => Shift(yy_state_23)
+    NT_uident => Shift(yy_state_164)
+    NT_type_decl_name_with_params => Shift(yy_state_436)
     _ => Error
   }
 }
 
-// [53, impl_sig → IMPL qualified_uident FOR • type_, EOF / SEMI]
-// [84, simple_type → • simple_type QUESTION, EOF / QUESTION / SEMI]
-// [85, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EOF / QUESTION / SEMI]
-// [86, simple_type → • LPAREN type_ RPAREN, EOF / QUESTION / SEMI]
-// [87, simple_type → • qualified_uident_ optional_type_arguments, EOF / QUESTION / SEMI]
-// [88, simple_type → • AMPER qualified_uident_, EOF / QUESTION / SEMI]
-// [89, simple_type → • UNDERSCORE, EOF / QUESTION / SEMI]
-// [90, type_ → • simple_type, EOF / SEMI]
-// [91, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [92, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [93, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [94, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [95, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [96, type_ → • LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [97, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [98, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [127, qualified_uident_ → • UIDENT, EOF / QUESTION / SEMI / LBRACKET]
-// [128, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EOF / QUESTION / SEMI / LBRACKET]
+// [43, type_sig → nonempty_list(attribute) PUB pub_attr TYPE type_decl_name_with_params •, EOF / SEMI]
+// [105, alias_sig → nonempty_list(attribute) PUB pub_attr TYPE type_decl_name_with_params • EQUAL type_, EOF / SEMI]
 
 ///|
-fn yy_state_156(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_436(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_EQUAL => Shift(yy_state_437)
+    T_EOF | T_SEMI => Reduce(5, NT_type_sig, yy_action_77)
+    _ => Error
+  }
+}
+
+// [105, alias_sig → nonempty_list(attribute) PUB pub_attr TYPE type_decl_name_with_params EQUAL • type_, EOF / SEMI]
+// [146, simple_type → • simple_type QUESTION, EOF / QUESTION / SEMI]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EOF / QUESTION / SEMI]
+// [148, simple_type → • LPAREN type_ RPAREN, EOF / QUESTION / SEMI]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, EOF / QUESTION / SEMI]
+// [150, simple_type → • AMPER qualified_uident_, EOF / QUESTION / SEMI]
+// [151, simple_type → • UNDERSCORE, EOF / QUESTION / SEMI]
+// [152, type_ → • simple_type, EOF / SEMI]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [185, qualified_uident_ → • UIDENT, EOF / QUESTION / SEMI / LBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EOF / QUESTION / SEMI / LBRACKET]
+
+///|
+fn yy_state_437(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_PACKAGE_NAME => Shift(yy_state_34)
-    T_UIDENT => Shift(yy_state_36)
-    T_ASYNC => Shift(yy_state_37)
-    T_UNDERSCORE => Shift(yy_state_43)
-    T_AMPER => Shift(yy_state_44)
-    NT_qualified_uident_ => Shift(yy_state_46)
-    T_LPAREN => Shift(yy_state_51)
-    NT_simple_type => Shift(yy_state_73)
-    NT_type_ => Shift(yy_state_157)
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_104)
+    NT_type_ => Shift(yy_state_438)
     _ => Error
   }
 }
 
-// [53, impl_sig → IMPL qualified_uident FOR type_ •, EOF / SEMI]
+// [105, alias_sig → nonempty_list(attribute) PUB pub_attr TYPE type_decl_name_with_params EQUAL type_ •, EOF / SEMI]
 
 ///|
-fn yy_state_157(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(4, NT_impl_sig, yy_action_113)
+fn yy_state_438(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(7, NT_alias_sig, yy_action_76)
 }
 
-// [52, impl_sig → IMPL type_params_with_constraints • qualified_uident FOR type_, EOF / SEMI]
-// [125, qualified_uident → • UIDENT, FOR]
-// [126, qualified_uident → • PACKAGE_NAME DOT_UIDENT, FOR]
+// [27, value_sig → nonempty_list(attribute) PUB pub_attr LET • lident COLON type_, EOF / SEMI]
+// [188, lident → • LIDENT, COLON]
 
 ///|
-fn yy_state_158(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_439(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_PACKAGE_NAME => Shift(yy_state_21)
-    T_UIDENT => Shift(yy_state_23)
-    NT_qualified_uident => Shift(yy_state_159)
+    T_LIDENT => Shift(yy_state_36)
+    NT_lident => Shift(yy_state_440)
     _ => Error
   }
 }
 
-// [52, impl_sig → IMPL type_params_with_constraints qualified_uident • FOR type_, EOF / SEMI]
+// [27, value_sig → nonempty_list(attribute) PUB pub_attr LET lident • COLON type_, EOF / SEMI]
 
 ///|
-fn yy_state_159(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_440(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_FOR => Shift(yy_state_160)
+    T_COLON => Shift(yy_state_441)
     _ => Error
   }
 }
 
-// [52, impl_sig → IMPL type_params_with_constraints qualified_uident FOR • type_, EOF / SEMI]
-// [84, simple_type → • simple_type QUESTION, EOF / QUESTION / SEMI]
-// [85, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EOF / QUESTION / SEMI]
-// [86, simple_type → • LPAREN type_ RPAREN, EOF / QUESTION / SEMI]
-// [87, simple_type → • qualified_uident_ optional_type_arguments, EOF / QUESTION / SEMI]
-// [88, simple_type → • AMPER qualified_uident_, EOF / QUESTION / SEMI]
-// [89, simple_type → • UNDERSCORE, EOF / QUESTION / SEMI]
-// [90, type_ → • simple_type, EOF / SEMI]
-// [91, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [92, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [93, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [94, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [95, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [96, type_ → • LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [97, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [98, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [127, qualified_uident_ → • UIDENT, EOF / QUESTION / SEMI / LBRACKET]
-// [128, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EOF / QUESTION / SEMI / LBRACKET]
-
-///|
-fn yy_state_160(_lookahead : YYSymbol) -> YYDecision {
+// [27, value_sig → nonempty_list(attribute) PUB pub_attr LET lident COLON • type_, EOF / SEMI]
+// [146, simple_type → • simple_type QUESTION, EOF / QUESTION / SEMI]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EOF / QUESTION / SEMI]
+// [148, simple_type → • LPAREN type_ RPAREN, EOF / QUESTION / SEMI]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, EOF / QUESTION / SEMI]
+// [150, simple_type → • AMPER qualified_uident_, EOF / QUESTION / SEMI]
+// [151, simple_type → • UNDERSCORE, EOF / QUESTION / SEMI]
+// [152, type_ → • simple_type, EOF / SEMI]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [185, qualified_uident_ → • UIDENT, EOF / QUESTION / SEMI / LBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EOF / QUESTION / SEMI / LBRACKET]
+
+///|
+fn yy_state_441(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_PACKAGE_NAME => Shift(yy_state_34)
-    T_UIDENT => Shift(yy_state_36)
-    T_ASYNC => Shift(yy_state_37)
-    T_UNDERSCORE => Shift(yy_state_43)
-    T_AMPER => Shift(yy_state_44)
-    NT_qualified_uident_ => Shift(yy_state_46)
-    T_LPAREN => Shift(yy_state_51)
-    NT_simple_type => Shift(yy_state_73)
-    NT_type_ => Shift(yy_state_161)
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_104)
+    NT_type_ => Shift(yy_state_442)
     _ => Error
   }
 }
 
-// [52, impl_sig → IMPL type_params_with_constraints qualified_uident FOR type_ •, EOF / SEMI]
+// [27, value_sig → nonempty_list(attribute) PUB pub_attr LET lident COLON type_ •, EOF / SEMI]
 
 ///|
-fn yy_state_161(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(5, NT_impl_sig, yy_action_112)
+fn yy_state_442(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(7, NT_value_sig, yy_action_75)
 }
 
-// [49, type_sig → ENUM • type_decl_name_with_params LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
-// [83, type_decl_name_with_params → • uident optional_type_params_no_constraints, LBRACE]
-// [129, uident → • UIDENT, LBRACKET / LBRACE]
+// [21, const_sig → nonempty_list(attribute) PUB pub_attr CONST • uident COLON type_ EQUAL constant, EOF / SEMI]
+// [187, uident → • UIDENT, COLON]
 
 ///|
-fn yy_state_162(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_443(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_31)
-    NT_uident => Shift(yy_state_91)
-    NT_type_decl_name_with_params => Shift(yy_state_163)
+    T_UIDENT => Shift(yy_state_23)
+    NT_uident => Shift(yy_state_444)
     _ => Error
   }
 }
 
-// [49, type_sig → ENUM type_decl_name_with_params • LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [21, const_sig → nonempty_list(attribute) PUB pub_attr CONST uident • COLON type_ EQUAL constant, EOF / SEMI]
 
 ///|
-fn yy_state_163(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_444(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACE => Shift(yy_state_164)
+    T_COLON => Shift(yy_state_445)
     _ => Error
   }
 }
 
-// [49, type_sig → ENUM type_decl_name_with_params LBRACE • separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
-// [68, enum_constructor → • UIDENT option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) option(eq_tag), SEMI / RBRACE]
-// [69, enum_constructor → • nonempty_list(attribute) UIDENT option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) option(eq_tag), SEMI / RBRACE]
-// [145, separated_list(SEMI,enum_constructor) → •, RBRACE]
-// [146, separated_list(SEMI,enum_constructor) → • separated_nonempty_list(SEMI,enum_constructor), RBRACE]
-// [173, nonempty_list(attribute) → • ATTRIBUTE, UIDENT]
-// [174, nonempty_list(attribute) → • ATTRIBUTE nonempty_list(attribute), UIDENT]
-// [179, separated_nonempty_list(SEMI,enum_constructor) → • enum_constructor, RBRACE]
-// [180, separated_nonempty_list(SEMI,enum_constructor) → • enum_constructor SEMI separated_nonempty_list(SEMI,enum_constructor), RBRACE]
-
-///|
-fn yy_state_164(_lookahead : YYSymbol) -> YYDecision {
+// [21, const_sig → nonempty_list(attribute) PUB pub_attr CONST uident COLON • type_ EQUAL constant, EOF / SEMI]
+// [146, simple_type → • simple_type QUESTION, EQUAL / QUESTION]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EQUAL / QUESTION]
+// [148, simple_type → • LPAREN type_ RPAREN, EQUAL / QUESTION]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, EQUAL / QUESTION]
+// [150, simple_type → • AMPER qualified_uident_, EQUAL / QUESTION]
+// [151, simple_type → • UNDERSCORE, EQUAL / QUESTION]
+// [152, type_ → • simple_type, EQUAL]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EQUAL]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EQUAL]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EQUAL]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EQUAL]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EQUAL]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, EQUAL]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EQUAL]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EQUAL]
+// [185, qualified_uident_ → • UIDENT, EQUAL / QUESTION / LBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EQUAL / QUESTION / LBRACKET]
+
+///|
+fn yy_state_445(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_enum_constructor => Shift(yy_state_165)
-    T_ATTRIBUTE => Shift(yy_state_168)
-    NT_nonempty_list_attribute_ => Shift(yy_state_169)
-    T_UIDENT => Shift(yy_state_187)
-    NT_separated_nonempty_list_SEMI_enum_constructor_ => Shift(yy_state_190)
-    NT_separated_list_SEMI_enum_constructor_ => Shift(yy_state_191)
-    T_RBRACE =>
-      Reduce(0, NT_separated_list_SEMI_enum_constructor_, yy_action_111)
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_104)
+    NT_type_ => Shift(yy_state_446)
     _ => Error
   }
 }
 
-// [179, separated_nonempty_list(SEMI,enum_constructor) → enum_constructor •, RBRACE]
-// [180, separated_nonempty_list(SEMI,enum_constructor) → enum_constructor • SEMI separated_nonempty_list(SEMI,enum_constructor), RBRACE]
+// [21, const_sig → nonempty_list(attribute) PUB pub_attr CONST uident COLON type_ • EQUAL constant, EOF / SEMI]
 
 ///|
-fn yy_state_165(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_446(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_SEMI => Shift(yy_state_166)
-    T_RBRACE =>
-      Reduce(
-        1,
-        NT_separated_nonempty_list_SEMI_enum_constructor_,
-        yy_action_110,
-      )
+    T_EQUAL => Shift(yy_state_447)
     _ => Error
   }
 }
 
-// [68, enum_constructor → • UIDENT option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) option(eq_tag), SEMI / RBRACE]
-// [69, enum_constructor → • nonempty_list(attribute) UIDENT option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) option(eq_tag), SEMI / RBRACE]
-// [173, nonempty_list(attribute) → • ATTRIBUTE, UIDENT]
-// [174, nonempty_list(attribute) → • ATTRIBUTE nonempty_list(attribute), UIDENT]
-// [179, separated_nonempty_list(SEMI,enum_constructor) → • enum_constructor, RBRACE]
-// [180, separated_nonempty_list(SEMI,enum_constructor) → • enum_constructor SEMI separated_nonempty_list(SEMI,enum_constructor), RBRACE]
-// [180, separated_nonempty_list(SEMI,enum_constructor) → enum_constructor SEMI • separated_nonempty_list(SEMI,enum_constructor), RBRACE]
+// [21, const_sig → nonempty_list(attribute) PUB pub_attr CONST uident COLON type_ EQUAL • constant, EOF / SEMI]
+// [171, constant → • TRUE, EOF / SEMI]
+// [172, constant → • FALSE, EOF / SEMI]
+// [173, constant → • BYTE, EOF / SEMI]
+// [174, constant → • BYTES, EOF / SEMI]
+// [175, constant → • CHAR, EOF / SEMI]
+// [176, constant → • INT, EOF / SEMI]
+// [177, constant → • FLOAT, EOF / SEMI]
+// [178, constant → • DOUBLE, EOF / SEMI]
+// [179, constant → • STRING, EOF / SEMI]
 
 ///|
-fn yy_state_166(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_447(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_enum_constructor => Shift(yy_state_165)
-    NT_separated_nonempty_list_SEMI_enum_constructor_ => Shift(yy_state_167)
-    T_ATTRIBUTE => Shift(yy_state_168)
-    NT_nonempty_list_attribute_ => Shift(yy_state_169)
-    T_UIDENT => Shift(yy_state_187)
+    T_STRING => Shift(yy_state_448)
+    T_DOUBLE => Shift(yy_state_449)
+    T_FLOAT => Shift(yy_state_450)
+    T_INT => Shift(yy_state_451)
+    T_CHAR => Shift(yy_state_452)
+    T_BYTES => Shift(yy_state_453)
+    T_BYTE => Shift(yy_state_454)
+    T_FALSE => Shift(yy_state_455)
+    T_TRUE => Shift(yy_state_456)
+    NT_constant => Shift(yy_state_457)
     _ => Error
   }
 }
 
-// [180, separated_nonempty_list(SEMI,enum_constructor) → enum_constructor SEMI separated_nonempty_list(SEMI,enum_constructor) •, RBRACE]
+// [179, constant → STRING •, EOF / SEMI]
 
 ///|
-fn yy_state_167(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(
-    3,
-    NT_separated_nonempty_list_SEMI_enum_constructor_,
-    yy_action_109,
-  )
+fn yy_state_448(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_constant, yy_action_74)
 }
 
-// [173, nonempty_list(attribute) → • ATTRIBUTE, LIDENT / UIDENT / MUTABLE]
-// [173, nonempty_list(attribute) → ATTRIBUTE •, LIDENT / UIDENT / MUTABLE]
-// [174, nonempty_list(attribute) → • ATTRIBUTE nonempty_list(attribute), LIDENT / UIDENT / MUTABLE]
-// [174, nonempty_list(attribute) → ATTRIBUTE • nonempty_list(attribute), LIDENT / UIDENT / MUTABLE]
+// [178, constant → DOUBLE •, EOF / SEMI]
 
 ///|
-fn yy_state_168(_lookahead : YYSymbol) -> YYDecision {
-  match _lookahead {
-    NT_nonempty_list_attribute_ => Shift(yy_state_18)
-    T_ATTRIBUTE => Shift(yy_state_168)
-    T_LIDENT | T_UIDENT | T_MUTABLE =>
-      Reduce(1, NT_nonempty_list_attribute_, yy_action_197)
-    _ => Error
-  }
+fn yy_state_449(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_constant, yy_action_73)
 }
 
-// [69, enum_constructor → nonempty_list(attribute) • UIDENT option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) option(eq_tag), SEMI / RBRACE]
+// [177, constant → FLOAT •, EOF / SEMI]
 
 ///|
-fn yy_state_169(_lookahead : YYSymbol) -> YYDecision {
-  match _lookahead {
-    T_UIDENT => Shift(yy_state_170)
-    _ => Error
-  }
+fn yy_state_450(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_constant, yy_action_72)
 }
 
-// [69, enum_constructor → nonempty_list(attribute) UIDENT • option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) option(eq_tag), SEMI / RBRACE]
-// [159, option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) → •, EQUAL / SEMI / RBRACE]
-// [160, option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) → • LPAREN separated_nonempty_list(COMMA,constructor_param) RPAREN, EQUAL / SEMI / RBRACE]
+// [176, constant → INT •, EOF / SEMI]
 
 ///|
-fn yy_state_170(_lookahead : YYSymbol) -> YYDecision {
-  match _lookahead {
-    T_LPAREN => Shift(yy_state_171)
-    NT_option_delimited_LPAREN_separated_nonempty_list_COMMA_constructor_param__RPAREN__ =>
-      Shift(yy_state_183)
-    T_EQUAL | T_SEMI | T_RBRACE =>
-      Reduce(
-        0,
-        NT_option_delimited_LPAREN_separated_nonempty_list_COMMA_constructor_param__RPAREN__,
-        yy_action_108,
-      )
-    _ => Error
-  }
+fn yy_state_451(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_constant, yy_action_71)
 }
 
-// [70, constructor_param → • boption(MUTABLE) type_, RPAREN / COMMA]
-// [71, constructor_param → • boption(MUTABLE) post_label COLON type_, RPAREN / COMMA]
-// [157, separated_nonempty_list(COMMA,constructor_param) → • constructor_param, RPAREN]
-// [158, separated_nonempty_list(COMMA,constructor_param) → • constructor_param COMMA separated_nonempty_list(COMMA,constructor_param), RPAREN]
-// [160, option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) → LPAREN • separated_nonempty_list(COMMA,constructor_param) RPAREN, EQUAL / SEMI / RBRACE]
-// [163, boption(MUTABLE) → •, UIDENT / POST_LABEL / ASYNC / LPAREN / UNDERSCORE / AMPER / PACKAGE_NAME]
-// [164, boption(MUTABLE) → • MUTABLE, UIDENT / POST_LABEL / ASYNC / LPAREN / UNDERSCORE / AMPER / PACKAGE_NAME]
+// [175, constant → CHAR •, EOF / SEMI]
 
 ///|
-fn yy_state_171(_lookahead : YYSymbol) -> YYDecision {
-  match _lookahead {
-    T_MUTABLE => Shift(yy_state_172)
-    NT_separated_nonempty_list_COMMA_constructor_param_ => Shift(yy_state_173)
-    NT_constructor_param => Shift(yy_state_175)
-    NT_boption_MUTABLE_ => Shift(yy_state_178)
-    T_UIDENT
-    | T_POST_LABEL
-    | T_ASYNC
-    | T_LPAREN
-    | T_UNDERSCORE
-    | T_AMPER
-    | T_PACKAGE_NAME => Reduce(0, NT_boption_MUTABLE_, yy_action_107)
-    _ => Error
-  }
+fn yy_state_452(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_constant, yy_action_70)
 }
 
-// [164, boption(MUTABLE) → MUTABLE •, LIDENT / UIDENT / POST_LABEL / ASYNC / LPAREN / UNDERSCORE / AMPER / PACKAGE_NAME]
+// [174, constant → BYTES •, EOF / SEMI]
 
 ///|
-fn yy_state_172(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_boption_MUTABLE_, yy_action_106)
+fn yy_state_453(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_constant, yy_action_69)
 }
 
-// [160, option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) → LPAREN separated_nonempty_list(COMMA,constructor_param) • RPAREN, EQUAL / SEMI / RBRACE]
+// [173, constant → BYTE •, EOF / SEMI]
 
 ///|
-fn yy_state_173(_lookahead : YYSymbol) -> YYDecision {
-  match _lookahead {
-    T_RPAREN => Shift(yy_state_174)
-    _ => Error
-  }
+fn yy_state_454(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_constant, yy_action_68)
 }
 
-// [160, option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) → LPAREN separated_nonempty_list(COMMA,constructor_param) RPAREN •, EQUAL / SEMI / RBRACE]
+// [172, constant → FALSE •, EOF / SEMI]
 
 ///|
-fn yy_state_174(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(
-    3,
-    NT_option_delimited_LPAREN_separated_nonempty_list_COMMA_constructor_param__RPAREN__,
-    yy_action_104,
-  )
+fn yy_state_455(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_constant, yy_action_67)
 }
 
-// [157, separated_nonempty_list(COMMA,constructor_param) → constructor_param •, RPAREN]
-// [158, separated_nonempty_list(COMMA,constructor_param) → constructor_param • COMMA separated_nonempty_list(COMMA,constructor_param), RPAREN]
+// [171, constant → TRUE •, EOF / SEMI]
 
 ///|
-fn yy_state_175(_lookahead : YYSymbol) -> YYDecision {
-  match _lookahead {
-    T_COMMA => Shift(yy_state_176)
-    T_RPAREN =>
-      Reduce(
-        1,
-        NT_separated_nonempty_list_COMMA_constructor_param_,
-        yy_action_103,
-      )
-    _ => Error
-  }
+fn yy_state_456(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_constant, yy_action_66)
 }
 
-// [70, constructor_param → • boption(MUTABLE) type_, RPAREN / COMMA]
-// [71, constructor_param → • boption(MUTABLE) post_label COLON type_, RPAREN / COMMA]
-// [157, separated_nonempty_list(COMMA,constructor_param) → • constructor_param, RPAREN]
-// [158, separated_nonempty_list(COMMA,constructor_param) → • constructor_param COMMA separated_nonempty_list(COMMA,constructor_param), RPAREN]
-// [158, separated_nonempty_list(COMMA,constructor_param) → constructor_param COMMA • separated_nonempty_list(COMMA,constructor_param), RPAREN]
-// [163, boption(MUTABLE) → •, UIDENT / POST_LABEL / ASYNC / LPAREN / UNDERSCORE / AMPER / PACKAGE_NAME]
-// [164, boption(MUTABLE) → • MUTABLE, UIDENT / POST_LABEL / ASYNC / LPAREN / UNDERSCORE / AMPER / PACKAGE_NAME]
+// [21, const_sig → nonempty_list(attribute) PUB pub_attr CONST uident COLON type_ EQUAL constant •, EOF / SEMI]
 
 ///|
-fn yy_state_176(_lookahead : YYSymbol) -> YYDecision {
-  match _lookahead {
-    T_MUTABLE => Shift(yy_state_172)
-    NT_constructor_param => Shift(yy_state_175)
-    NT_separated_nonempty_list_COMMA_constructor_param_ => Shift(yy_state_177)
-    NT_boption_MUTABLE_ => Shift(yy_state_178)
-    T_UIDENT
-    | T_POST_LABEL
-    | T_ASYNC
-    | T_LPAREN
-    | T_UNDERSCORE
-    | T_AMPER
-    | T_PACKAGE_NAME => Reduce(0, NT_boption_MUTABLE_, yy_action_107)
-    _ => Error
-  }
+fn yy_state_457(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(9, NT_const_sig, yy_action_65)
 }
 
-// [158, separated_nonempty_list(COMMA,constructor_param) → constructor_param COMMA separated_nonempty_list(COMMA,constructor_param) •, RPAREN]
-
-///|
-fn yy_state_177(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(
-    3,
-    NT_separated_nonempty_list_COMMA_constructor_param_,
-    yy_action_102,
-  )
-}
-
-// [70, constructor_param → boption(MUTABLE) • type_, RPAREN / COMMA]
-// [71, constructor_param → boption(MUTABLE) • post_label COLON type_, RPAREN / COMMA]
-// [84, simple_type → • simple_type QUESTION, RPAREN / COMMA / QUESTION]
-// [85, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, RPAREN / COMMA / QUESTION]
-// [86, simple_type → • LPAREN type_ RPAREN, RPAREN / COMMA / QUESTION]
-// [87, simple_type → • qualified_uident_ optional_type_arguments, RPAREN / COMMA / QUESTION]
-// [88, simple_type → • AMPER qualified_uident_, RPAREN / COMMA / QUESTION]
-// [89, simple_type → • UNDERSCORE, RPAREN / COMMA / QUESTION]
-// [90, type_ → • simple_type, RPAREN / COMMA]
-// [91, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [92, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [93, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [94, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [95, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [96, type_ → • LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [97, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [98, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [127, qualified_uident_ → • UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
-// [128, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
-// [132, post_label → • POST_LABEL, COLON]
+// [20, const_sig → nonempty_list(attribute) PRIV • CONST uident COLON type_ EQUAL constant, EOF / SEMI]
+// [26, value_sig → nonempty_list(attribute) PRIV • LET lident COLON type_, EOF / SEMI]
+// [42, type_sig → nonempty_list(attribute) PRIV • TYPE type_decl_name_with_params, EOF / SEMI]
+// [48, type_sig → nonempty_list(attribute) PRIV • SUBERROR uident option(type_), EOF / SEMI]
+// [54, type_sig → nonempty_list(attribute) PRIV • SUBERROR uident LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [60, type_sig → nonempty_list(attribute) PRIV • STRUCT type_decl_name_with_params LBRACE record_decl_body RBRACE, EOF / SEMI]
+// [66, type_sig → nonempty_list(attribute) PRIV • STRUCT type_decl_name_with_params LPAREN separated_list(COMMA,type_) RPAREN, EOF / SEMI]
+// [72, type_sig → nonempty_list(attribute) PRIV • ENUM type_decl_name_with_params LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [78, impl_sig → nonempty_list(attribute) PRIV • IMPL type_params_with_constraints qualified_uident FOR type_, EOF / SEMI]
+// [84, impl_sig → nonempty_list(attribute) PRIV • IMPL qualified_uident FOR type_, EOF / SEMI]
+// [90, trait_sig → nonempty_list(attribute) PRIV • TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
+// [96, trait_sig → nonempty_list(attribute) PRIV • TRAIT uident, EOF / SEMI]
+// [104, alias_sig → nonempty_list(attribute) PRIV • TYPE type_decl_name_with_params EQUAL type_, EOF / SEMI]
+// [112, alias_sig → nonempty_list(attribute) PRIV • USING PACKAGE_NAME LBRACE TYPE uident using_binder RBRACE, EOF / SEMI]
+// [118, alias_sig → nonempty_list(attribute) PRIV • USING PACKAGE_NAME LBRACE TRAIT uident using_binder RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_178(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_458(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_PACKAGE_NAME => Shift(yy_state_34)
-    T_UIDENT => Shift(yy_state_36)
-    T_ASYNC => Shift(yy_state_37)
-    T_UNDERSCORE => Shift(yy_state_43)
-    T_AMPER => Shift(yy_state_44)
-    NT_qualified_uident_ => Shift(yy_state_46)
-    T_LPAREN => Shift(yy_state_51)
-    NT_simple_type => Shift(yy_state_73)
-    T_POST_LABEL => Shift(yy_state_121)
-    NT_post_label => Shift(yy_state_179)
-    NT_type_ => Shift(yy_state_182)
+    T_USING => Shift(yy_state_459)
+    T_TRAIT => Shift(yy_state_470)
+    T_IMPL => Shift(yy_state_476)
+    T_ENUM => Shift(yy_state_484)
+    T_STRUCT => Shift(yy_state_489)
+    T_SUBERROR => Shift(yy_state_497)
+    T_TYPE => Shift(yy_state_503)
+    T_LET => Shift(yy_state_507)
+    T_CONST => Shift(yy_state_511)
     _ => Error
   }
 }
 
-// [71, constructor_param → boption(MUTABLE) post_label • COLON type_, RPAREN / COMMA]
+// [112, alias_sig → nonempty_list(attribute) PRIV USING • PACKAGE_NAME LBRACE TYPE uident using_binder RBRACE, EOF / SEMI]
+// [118, alias_sig → nonempty_list(attribute) PRIV USING • PACKAGE_NAME LBRACE TRAIT uident using_binder RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_179(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_459(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_180)
+    T_PACKAGE_NAME => Shift(yy_state_460)
     _ => Error
   }
 }
 
-// [71, constructor_param → boption(MUTABLE) post_label COLON • type_, RPAREN / COMMA]
-// [84, simple_type → • simple_type QUESTION, RPAREN / COMMA / QUESTION]
-// [85, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, RPAREN / COMMA / QUESTION]
-// [86, simple_type → • LPAREN type_ RPAREN, RPAREN / COMMA / QUESTION]
-// [87, simple_type → • qualified_uident_ optional_type_arguments, RPAREN / COMMA / QUESTION]
-// [88, simple_type → • AMPER qualified_uident_, RPAREN / COMMA / QUESTION]
-// [89, simple_type → • UNDERSCORE, RPAREN / COMMA / QUESTION]
-// [90, type_ → • simple_type, RPAREN / COMMA]
-// [91, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [92, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [93, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [94, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [95, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [96, type_ → • LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [97, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [98, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [127, qualified_uident_ → • UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
-// [128, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
+// [112, alias_sig → nonempty_list(attribute) PRIV USING PACKAGE_NAME • LBRACE TYPE uident using_binder RBRACE, EOF / SEMI]
+// [118, alias_sig → nonempty_list(attribute) PRIV USING PACKAGE_NAME • LBRACE TRAIT uident using_binder RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_180(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_460(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_PACKAGE_NAME => Shift(yy_state_34)
-    T_UIDENT => Shift(yy_state_36)
-    T_ASYNC => Shift(yy_state_37)
-    T_UNDERSCORE => Shift(yy_state_43)
-    T_AMPER => Shift(yy_state_44)
-    NT_qualified_uident_ => Shift(yy_state_46)
-    T_LPAREN => Shift(yy_state_51)
-    NT_simple_type => Shift(yy_state_73)
-    NT_type_ => Shift(yy_state_181)
+    T_LBRACE => Shift(yy_state_461)
     _ => Error
   }
 }
 
-// [71, constructor_param → boption(MUTABLE) post_label COLON type_ •, RPAREN / COMMA]
+// [112, alias_sig → nonempty_list(attribute) PRIV USING PACKAGE_NAME LBRACE • TYPE uident using_binder RBRACE, EOF / SEMI]
+// [118, alias_sig → nonempty_list(attribute) PRIV USING PACKAGE_NAME LBRACE • TRAIT uident using_binder RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_181(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(4, NT_constructor_param, yy_action_101)
+fn yy_state_461(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_TRAIT => Shift(yy_state_462)
+    T_TYPE => Shift(yy_state_466)
+    _ => Error
+  }
 }
 
-// [70, constructor_param → boption(MUTABLE) type_ •, RPAREN / COMMA]
+// [118, alias_sig → nonempty_list(attribute) PRIV USING PACKAGE_NAME LBRACE TRAIT • uident using_binder RBRACE, EOF / SEMI]
+// [187, uident → • UIDENT, RBRACE / AS]
 
 ///|
-fn yy_state_182(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_constructor_param, yy_action_100)
+fn yy_state_462(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_UIDENT => Shift(yy_state_23)
+    NT_uident => Shift(yy_state_463)
+    _ => Error
+  }
 }
 
-// [69, enum_constructor → nonempty_list(attribute) UIDENT option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) • option(eq_tag), SEMI / RBRACE]
-// [161, option(eq_tag) → •, SEMI / RBRACE]
-// [162, option(eq_tag) → • EQUAL INT, SEMI / RBRACE]
+// [98, using_binder → •, RBRACE]
+// [99, using_binder → • AS uident, RBRACE]
+// [118, alias_sig → nonempty_list(attribute) PRIV USING PACKAGE_NAME LBRACE TRAIT uident • using_binder RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_183(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_463(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_EQUAL => Shift(yy_state_184)
-    NT_option_eq_tag_ => Shift(yy_state_186)
-    T_SEMI | T_RBRACE => Reduce(0, NT_option_eq_tag_, yy_action_99)
+    T_AS => Shift(yy_state_27)
+    NT_using_binder => Shift(yy_state_464)
+    T_RBRACE => Reduce(0, NT_using_binder, yy_action_243)
     _ => Error
   }
 }
 
-// [162, option(eq_tag) → EQUAL • INT, SEMI / RBRACE]
+// [118, alias_sig → nonempty_list(attribute) PRIV USING PACKAGE_NAME LBRACE TRAIT uident using_binder • RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_184(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_464(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_INT => Shift(yy_state_185)
+    T_RBRACE => Shift(yy_state_465)
     _ => Error
   }
 }
 
-// [162, option(eq_tag) → EQUAL INT •, SEMI / RBRACE]
+// [118, alias_sig → nonempty_list(attribute) PRIV USING PACKAGE_NAME LBRACE TRAIT uident using_binder RBRACE •, EOF / SEMI]
 
 ///|
-fn yy_state_185(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_option_eq_tag_, yy_action_97)
+fn yy_state_465(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(9, NT_alias_sig, yy_action_64)
 }
 
-// [69, enum_constructor → nonempty_list(attribute) UIDENT option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) option(eq_tag) •, SEMI / RBRACE]
+// [112, alias_sig → nonempty_list(attribute) PRIV USING PACKAGE_NAME LBRACE TYPE • uident using_binder RBRACE, EOF / SEMI]
+// [187, uident → • UIDENT, RBRACE / AS]
 
 ///|
-fn yy_state_186(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(4, NT_enum_constructor, yy_action_96)
+fn yy_state_466(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_UIDENT => Shift(yy_state_23)
+    NT_uident => Shift(yy_state_467)
+    _ => Error
+  }
 }
 
-// [68, enum_constructor → UIDENT • option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) option(eq_tag), SEMI / RBRACE]
-// [159, option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) → •, EQUAL / SEMI / RBRACE]
-// [160, option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) → • LPAREN separated_nonempty_list(COMMA,constructor_param) RPAREN, EQUAL / SEMI / RBRACE]
+// [98, using_binder → •, RBRACE]
+// [99, using_binder → • AS uident, RBRACE]
+// [112, alias_sig → nonempty_list(attribute) PRIV USING PACKAGE_NAME LBRACE TYPE uident • using_binder RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_187(_lookahead : YYSymbol) -> YYDecision {
-  match _lookahead {
-    T_LPAREN => Shift(yy_state_171)
-    NT_option_delimited_LPAREN_separated_nonempty_list_COMMA_constructor_param__RPAREN__ =>
-      Shift(yy_state_188)
-    T_EQUAL | T_SEMI | T_RBRACE =>
-      Reduce(
-        0,
-        NT_option_delimited_LPAREN_separated_nonempty_list_COMMA_constructor_param__RPAREN__,
-        yy_action_108,
-      )
+fn yy_state_467(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_AS => Shift(yy_state_27)
+    NT_using_binder => Shift(yy_state_468)
+    T_RBRACE => Reduce(0, NT_using_binder, yy_action_243)
     _ => Error
   }
 }
 
-// [68, enum_constructor → UIDENT option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) • option(eq_tag), SEMI / RBRACE]
-// [161, option(eq_tag) → •, SEMI / RBRACE]
-// [162, option(eq_tag) → • EQUAL INT, SEMI / RBRACE]
+// [112, alias_sig → nonempty_list(attribute) PRIV USING PACKAGE_NAME LBRACE TYPE uident using_binder • RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_188(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_468(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_EQUAL => Shift(yy_state_184)
-    NT_option_eq_tag_ => Shift(yy_state_189)
-    T_SEMI | T_RBRACE => Reduce(0, NT_option_eq_tag_, yy_action_99)
+    T_RBRACE => Shift(yy_state_469)
     _ => Error
   }
 }
 
-// [68, enum_constructor → UIDENT option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) option(eq_tag) •, SEMI / RBRACE]
+// [112, alias_sig → nonempty_list(attribute) PRIV USING PACKAGE_NAME LBRACE TYPE uident using_binder RBRACE •, EOF / SEMI]
 
 ///|
-fn yy_state_189(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_enum_constructor, yy_action_95)
+fn yy_state_469(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(9, NT_alias_sig, yy_action_63)
 }
 
-// [146, separated_list(SEMI,enum_constructor) → separated_nonempty_list(SEMI,enum_constructor) •, RBRACE]
+// [90, trait_sig → nonempty_list(attribute) PRIV TRAIT • uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
+// [96, trait_sig → nonempty_list(attribute) PRIV TRAIT • uident, EOF / SEMI]
+// [187, uident → • UIDENT, EOF / COLON / SEMI / LBRACE]
 
 ///|
-fn yy_state_190(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_separated_list_SEMI_enum_constructor_, yy_action_94)
+fn yy_state_470(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_UIDENT => Shift(yy_state_23)
+    NT_uident => Shift(yy_state_471)
+    _ => Error
+  }
 }
 
-// [49, type_sig → ENUM type_decl_name_with_params LBRACE separated_list(SEMI,enum_constructor) • RBRACE, EOF / SEMI]
+// [90, trait_sig → nonempty_list(attribute) PRIV TRAIT uident • loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
+// [96, trait_sig → nonempty_list(attribute) PRIV TRAIT uident •, EOF / SEMI]
+// [209, loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) → •, LBRACE]
+// [210, loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) → • COLON separated_nonempty_list(PLUS,qualified_uident), LBRACE]
 
 ///|
-fn yy_state_191(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_471(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RBRACE => Shift(yy_state_192)
+    T_COLON => Shift(yy_state_40)
+    NT_loption_preceded_COLON_separated_nonempty_list_PLUS_qualified_uident___ =>
+      Shift(yy_state_472)
+    T_LBRACE =>
+      Reduce(
+        0,
+        NT_loption_preceded_COLON_separated_nonempty_list_PLUS_qualified_uident___,
+        yy_action_236,
+      )
+    T_EOF | T_SEMI => Reduce(4, NT_trait_sig, yy_action_62)
     _ => Error
   }
 }
 
-// [49, type_sig → ENUM type_decl_name_with_params LBRACE separated_list(SEMI,enum_constructor) RBRACE •, EOF / SEMI]
+// [90, trait_sig → nonempty_list(attribute) PRIV TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) • LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_192(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(5, NT_type_sig, yy_action_93)
+fn yy_state_472(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_LBRACE => Shift(yy_state_473)
+    _ => Error
+  }
 }
 
-// [43, type_sig → STRUCT • type_decl_name_with_params LBRACE separated_list(SEMI,record_decl_field) RBRACE, EOF / SEMI]
-// [46, type_sig → STRUCT • type_decl_name_with_params LPAREN separated_list(COMMA,type_) RPAREN, EOF / SEMI]
-// [83, type_decl_name_with_params → • uident optional_type_params_no_constraints, LPAREN / LBRACE]
-// [129, uident → • UIDENT, LPAREN / LBRACKET / LBRACE]
+// [36, trait_method_sig → • lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type boption(eq_underscore), SEMI / RBRACE]
+// [37, trait_method_sig → • nonempty_list(attribute) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type boption(eq_underscore), SEMI / RBRACE]
+// [90, trait_sig → nonempty_list(attribute) PRIV TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE • separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
+// [188, lident → • LIDENT, LPAREN]
+// [211, separated_nonempty_list(SEMI,trait_method_sig) → • trait_method_sig, RBRACE]
+// [212, separated_nonempty_list(SEMI,trait_method_sig) → • trait_method_sig SEMI separated_nonempty_list(SEMI,trait_method_sig), RBRACE]
+// [229, nonempty_list(attribute) → • ATTRIBUTE, LIDENT]
+// [230, nonempty_list(attribute) → • ATTRIBUTE nonempty_list(attribute), LIDENT]
 
 ///|
-fn yy_state_193(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_473(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_31)
-    NT_uident => Shift(yy_state_91)
-    NT_type_decl_name_with_params => Shift(yy_state_194)
+    T_ATTRIBUTE => Shift(yy_state_17)
+    T_LIDENT => Shift(yy_state_36)
+    NT_trait_method_sig => Shift(yy_state_50)
+    NT_nonempty_list_attribute_ => Shift(yy_state_53)
+    NT_lident => Shift(yy_state_132)
+    NT_separated_nonempty_list_SEMI_trait_method_sig_ => Shift(yy_state_474)
     _ => Error
   }
 }
 
-// [43, type_sig → STRUCT type_decl_name_with_params • LBRACE separated_list(SEMI,record_decl_field) RBRACE, EOF / SEMI]
-// [46, type_sig → STRUCT type_decl_name_with_params • LPAREN separated_list(COMMA,type_) RPAREN, EOF / SEMI]
+// [90, trait_sig → nonempty_list(attribute) PRIV TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) • RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_194(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_474(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LPAREN => Shift(yy_state_195)
-    T_LBRACE => Shift(yy_state_199)
+    T_RBRACE => Shift(yy_state_475)
     _ => Error
   }
 }
 
-// [46, type_sig → STRUCT type_decl_name_with_params LPAREN • separated_list(COMMA,type_) RPAREN, EOF / SEMI]
-// [84, simple_type → • simple_type QUESTION, RPAREN / COMMA / QUESTION]
-// [85, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, RPAREN / COMMA / QUESTION]
-// [86, simple_type → • LPAREN type_ RPAREN, RPAREN / COMMA / QUESTION]
-// [87, simple_type → • qualified_uident_ optional_type_arguments, RPAREN / COMMA / QUESTION]
-// [88, simple_type → • AMPER qualified_uident_, RPAREN / COMMA / QUESTION]
-// [89, simple_type → • UNDERSCORE, RPAREN / COMMA / QUESTION]
-// [90, type_ → • simple_type, RPAREN / COMMA]
-// [91, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [92, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [93, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [94, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [95, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [96, type_ → • LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [97, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [98, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [127, qualified_uident_ → • UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
-// [128, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
-// [149, separated_list(COMMA,type_) → •, RPAREN]
-// [150, separated_list(COMMA,type_) → • separated_nonempty_list(COMMA,type_), RPAREN]
-// [171, separated_nonempty_list(COMMA,type_) → • type_, RPAREN]
-// [172, separated_nonempty_list(COMMA,type_) → • type_ COMMA separated_nonempty_list(COMMA,type_), RPAREN]
+// [90, trait_sig → nonempty_list(attribute) PRIV TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE •, EOF / SEMI]
 
 ///|
-fn yy_state_195(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_475(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(8, NT_trait_sig, yy_action_61)
+}
+
+// [78, impl_sig → nonempty_list(attribute) PRIV IMPL • type_params_with_constraints qualified_uident FOR type_, EOF / SEMI]
+// [84, impl_sig → nonempty_list(attribute) PRIV IMPL • qualified_uident FOR type_, EOF / SEMI]
+// [138, type_params_with_constraints → • LBRACKET separated_list(COMMA,type_param_with_constraints) RBRACKET, UIDENT / PACKAGE_NAME]
+// [183, qualified_uident → • UIDENT, FOR]
+// [184, qualified_uident → • PACKAGE_NAME DOT_UIDENT, FOR]
+
+///|
+fn yy_state_476(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_PACKAGE_NAME => Shift(yy_state_34)
-    T_UIDENT => Shift(yy_state_36)
-    T_ASYNC => Shift(yy_state_37)
-    T_UNDERSCORE => Shift(yy_state_43)
-    T_AMPER => Shift(yy_state_44)
-    NT_qualified_uident_ => Shift(yy_state_46)
-    NT_type_ => Shift(yy_state_48)
-    T_LPAREN => Shift(yy_state_51)
-    NT_simple_type => Shift(yy_state_73)
-    NT_separated_nonempty_list_COMMA_type__ => Shift(yy_state_196)
-    NT_separated_list_COMMA_type__ => Shift(yy_state_197)
-    T_RPAREN => Reduce(0, NT_separated_list_COMMA_type__, yy_action_92)
+    T_PACKAGE_NAME => Shift(yy_state_45)
+    T_UIDENT => Shift(yy_state_47)
+    T_LBRACKET => Shift(yy_state_142)
+    NT_qualified_uident => Shift(yy_state_477)
+    NT_type_params_with_constraints => Shift(yy_state_480)
     _ => Error
   }
 }
 
-// [150, separated_list(COMMA,type_) → separated_nonempty_list(COMMA,type_) •, RPAREN]
+// [84, impl_sig → nonempty_list(attribute) PRIV IMPL qualified_uident • FOR type_, EOF / SEMI]
 
 ///|
-fn yy_state_196(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_separated_list_COMMA_type__, yy_action_91)
+fn yy_state_477(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_FOR => Shift(yy_state_478)
+    _ => Error
+  }
 }
 
-// [46, type_sig → STRUCT type_decl_name_with_params LPAREN separated_list(COMMA,type_) • RPAREN, EOF / SEMI]
-
-///|
-fn yy_state_197(_lookahead : YYSymbol) -> YYDecision {
+// [84, impl_sig → nonempty_list(attribute) PRIV IMPL qualified_uident FOR • type_, EOF / SEMI]
+// [146, simple_type → • simple_type QUESTION, EOF / QUESTION / SEMI]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EOF / QUESTION / SEMI]
+// [148, simple_type → • LPAREN type_ RPAREN, EOF / QUESTION / SEMI]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, EOF / QUESTION / SEMI]
+// [150, simple_type → • AMPER qualified_uident_, EOF / QUESTION / SEMI]
+// [151, simple_type → • UNDERSCORE, EOF / QUESTION / SEMI]
+// [152, type_ → • simple_type, EOF / SEMI]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [185, qualified_uident_ → • UIDENT, EOF / QUESTION / SEMI / LBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EOF / QUESTION / SEMI / LBRACKET]
+
+///|
+fn yy_state_478(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RPAREN => Shift(yy_state_198)
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_104)
+    NT_type_ => Shift(yy_state_479)
     _ => Error
   }
 }
 
-// [46, type_sig → STRUCT type_decl_name_with_params LPAREN separated_list(COMMA,type_) RPAREN •, EOF / SEMI]
+// [84, impl_sig → nonempty_list(attribute) PRIV IMPL qualified_uident FOR type_ •, EOF / SEMI]
 
 ///|
-fn yy_state_198(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(5, NT_type_sig, yy_action_90)
+fn yy_state_479(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(6, NT_impl_sig, yy_action_60)
 }
 
-// [43, type_sig → STRUCT type_decl_name_with_params LBRACE • separated_list(SEMI,record_decl_field) RBRACE, EOF / SEMI]
-// [72, record_decl_field → • boption(MUTABLE) LIDENT COLON type_, SEMI / RBRACE]
-// [73, record_decl_field → • nonempty_list(attribute) boption(MUTABLE) LIDENT COLON type_, SEMI / RBRACE]
-// [147, separated_list(SEMI,record_decl_field) → •, RBRACE]
-// [148, separated_list(SEMI,record_decl_field) → • separated_nonempty_list(SEMI,record_decl_field), RBRACE]
-// [163, boption(MUTABLE) → •, LIDENT]
-// [164, boption(MUTABLE) → • MUTABLE, LIDENT]
-// [173, nonempty_list(attribute) → • ATTRIBUTE, LIDENT / MUTABLE]
-// [174, nonempty_list(attribute) → • ATTRIBUTE nonempty_list(attribute), LIDENT / MUTABLE]
-// [181, separated_nonempty_list(SEMI,record_decl_field) → • record_decl_field, RBRACE]
-// [182, separated_nonempty_list(SEMI,record_decl_field) → • record_decl_field SEMI separated_nonempty_list(SEMI,record_decl_field), RBRACE]
+// [78, impl_sig → nonempty_list(attribute) PRIV IMPL type_params_with_constraints • qualified_uident FOR type_, EOF / SEMI]
+// [183, qualified_uident → • UIDENT, FOR]
+// [184, qualified_uident → • PACKAGE_NAME DOT_UIDENT, FOR]
 
 ///|
-fn yy_state_199(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_480(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_ATTRIBUTE => Shift(yy_state_168)
-    T_MUTABLE => Shift(yy_state_172)
-    NT_record_decl_field => Shift(yy_state_200)
-    NT_nonempty_list_attribute_ => Shift(yy_state_203)
-    NT_boption_MUTABLE_ => Shift(yy_state_208)
-    NT_separated_nonempty_list_SEMI_record_decl_field_ => Shift(yy_state_212)
-    NT_separated_list_SEMI_record_decl_field_ => Shift(yy_state_213)
-    T_RBRACE =>
-      Reduce(0, NT_separated_list_SEMI_record_decl_field_, yy_action_89)
-    T_LIDENT => Reduce(0, NT_boption_MUTABLE_, yy_action_107)
+    T_PACKAGE_NAME => Shift(yy_state_45)
+    T_UIDENT => Shift(yy_state_47)
+    NT_qualified_uident => Shift(yy_state_481)
     _ => Error
   }
 }
 
-// [181, separated_nonempty_list(SEMI,record_decl_field) → record_decl_field •, RBRACE]
-// [182, separated_nonempty_list(SEMI,record_decl_field) → record_decl_field • SEMI separated_nonempty_list(SEMI,record_decl_field), RBRACE]
+// [78, impl_sig → nonempty_list(attribute) PRIV IMPL type_params_with_constraints qualified_uident • FOR type_, EOF / SEMI]
 
 ///|
-fn yy_state_200(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_481(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_SEMI => Shift(yy_state_201)
-    T_RBRACE =>
-      Reduce(
-        1,
-        NT_separated_nonempty_list_SEMI_record_decl_field_,
-        yy_action_88,
-      )
+    T_FOR => Shift(yy_state_482)
     _ => Error
   }
 }
 
-// [72, record_decl_field → • boption(MUTABLE) LIDENT COLON type_, SEMI / RBRACE]
-// [73, record_decl_field → • nonempty_list(attribute) boption(MUTABLE) LIDENT COLON type_, SEMI / RBRACE]
-// [163, boption(MUTABLE) → •, LIDENT]
-// [164, boption(MUTABLE) → • MUTABLE, LIDENT]
-// [173, nonempty_list(attribute) → • ATTRIBUTE, LIDENT / MUTABLE]
-// [174, nonempty_list(attribute) → • ATTRIBUTE nonempty_list(attribute), LIDENT / MUTABLE]
-// [181, separated_nonempty_list(SEMI,record_decl_field) → • record_decl_field, RBRACE]
-// [182, separated_nonempty_list(SEMI,record_decl_field) → • record_decl_field SEMI separated_nonempty_list(SEMI,record_decl_field), RBRACE]
-// [182, separated_nonempty_list(SEMI,record_decl_field) → record_decl_field SEMI • separated_nonempty_list(SEMI,record_decl_field), RBRACE]
-
-///|
-fn yy_state_201(_lookahead : YYSymbol) -> YYDecision {
+// [78, impl_sig → nonempty_list(attribute) PRIV IMPL type_params_with_constraints qualified_uident FOR • type_, EOF / SEMI]
+// [146, simple_type → • simple_type QUESTION, EOF / QUESTION / SEMI]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EOF / QUESTION / SEMI]
+// [148, simple_type → • LPAREN type_ RPAREN, EOF / QUESTION / SEMI]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, EOF / QUESTION / SEMI]
+// [150, simple_type → • AMPER qualified_uident_, EOF / QUESTION / SEMI]
+// [151, simple_type → • UNDERSCORE, EOF / QUESTION / SEMI]
+// [152, type_ → • simple_type, EOF / SEMI]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [185, qualified_uident_ → • UIDENT, EOF / QUESTION / SEMI / LBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EOF / QUESTION / SEMI / LBRACKET]
+
+///|
+fn yy_state_482(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_ATTRIBUTE => Shift(yy_state_168)
-    T_MUTABLE => Shift(yy_state_172)
-    NT_record_decl_field => Shift(yy_state_200)
-    NT_separated_nonempty_list_SEMI_record_decl_field_ => Shift(yy_state_202)
-    NT_nonempty_list_attribute_ => Shift(yy_state_203)
-    NT_boption_MUTABLE_ => Shift(yy_state_208)
-    T_LIDENT => Reduce(0, NT_boption_MUTABLE_, yy_action_107)
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_104)
+    NT_type_ => Shift(yy_state_483)
     _ => Error
   }
 }
 
-// [182, separated_nonempty_list(SEMI,record_decl_field) → record_decl_field SEMI separated_nonempty_list(SEMI,record_decl_field) •, RBRACE]
+// [78, impl_sig → nonempty_list(attribute) PRIV IMPL type_params_with_constraints qualified_uident FOR type_ •, EOF / SEMI]
 
 ///|
-fn yy_state_202(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(
-    3,
-    NT_separated_nonempty_list_SEMI_record_decl_field_,
-    yy_action_87,
-  )
+fn yy_state_483(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(7, NT_impl_sig, yy_action_59)
 }
 
-// [73, record_decl_field → nonempty_list(attribute) • boption(MUTABLE) LIDENT COLON type_, SEMI / RBRACE]
-// [163, boption(MUTABLE) → •, LIDENT]
-// [164, boption(MUTABLE) → • MUTABLE, LIDENT]
+// [72, type_sig → nonempty_list(attribute) PRIV ENUM • type_decl_name_with_params LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [145, type_decl_name_with_params → • uident optional_type_params_no_constraints, LBRACE]
+// [187, uident → • UIDENT, LBRACKET / LBRACE]
 
 ///|
-fn yy_state_203(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_484(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_MUTABLE => Shift(yy_state_172)
-    NT_boption_MUTABLE_ => Shift(yy_state_204)
-    T_LIDENT => Reduce(0, NT_boption_MUTABLE_, yy_action_107)
+    T_UIDENT => Shift(yy_state_23)
+    NT_uident => Shift(yy_state_164)
+    NT_type_decl_name_with_params => Shift(yy_state_485)
     _ => Error
   }
 }
 
-// [73, record_decl_field → nonempty_list(attribute) boption(MUTABLE) • LIDENT COLON type_, SEMI / RBRACE]
+// [72, type_sig → nonempty_list(attribute) PRIV ENUM type_decl_name_with_params • LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_204(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_485(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LIDENT => Shift(yy_state_205)
+    T_LBRACE => Shift(yy_state_486)
     _ => Error
   }
 }
 
-// [73, record_decl_field → nonempty_list(attribute) boption(MUTABLE) LIDENT • COLON type_, SEMI / RBRACE]
+// [72, type_sig → nonempty_list(attribute) PRIV ENUM type_decl_name_with_params LBRACE • separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [120, enum_constructor → • UIDENT option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) option(eq_tag), SEMI / RBRACE]
+// [121, enum_constructor → • nonempty_list(attribute) UIDENT option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) option(eq_tag), SEMI / RBRACE]
+// [203, separated_list(SEMI,enum_constructor) → •, RBRACE]
+// [204, separated_list(SEMI,enum_constructor) → • separated_nonempty_list(SEMI,enum_constructor), RBRACE]
+// [229, nonempty_list(attribute) → • ATTRIBUTE, UIDENT]
+// [230, nonempty_list(attribute) → • ATTRIBUTE nonempty_list(attribute), UIDENT]
+// [233, separated_nonempty_list(SEMI,enum_constructor) → • enum_constructor, RBRACE]
+// [234, separated_nonempty_list(SEMI,enum_constructor) → • enum_constructor SEMI separated_nonempty_list(SEMI,enum_constructor), RBRACE]
 
 ///|
-fn yy_state_205(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_486(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_206)
+    T_ATTRIBUTE => Shift(yy_state_17)
+    NT_enum_constructor => Shift(yy_state_178)
+    NT_nonempty_list_attribute_ => Shift(yy_state_181)
+    T_UIDENT => Shift(yy_state_199)
+    NT_separated_nonempty_list_SEMI_enum_constructor_ => Shift(yy_state_202)
+    NT_separated_list_SEMI_enum_constructor_ => Shift(yy_state_487)
+    T_RBRACE =>
+      Reduce(0, NT_separated_list_SEMI_enum_constructor_, yy_action_161)
     _ => Error
   }
 }
 
-// [73, record_decl_field → nonempty_list(attribute) boption(MUTABLE) LIDENT COLON • type_, SEMI / RBRACE]
-// [84, simple_type → • simple_type QUESTION, QUESTION / SEMI / RBRACE]
-// [85, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, QUESTION / SEMI / RBRACE]
-// [86, simple_type → • LPAREN type_ RPAREN, QUESTION / SEMI / RBRACE]
-// [87, simple_type → • qualified_uident_ optional_type_arguments, QUESTION / SEMI / RBRACE]
-// [88, simple_type → • AMPER qualified_uident_, QUESTION / SEMI / RBRACE]
-// [89, simple_type → • UNDERSCORE, QUESTION / SEMI / RBRACE]
-// [90, type_ → • simple_type, SEMI / RBRACE]
-// [91, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, SEMI / RBRACE]
-// [92, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, SEMI / RBRACE]
-// [93, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, SEMI / RBRACE]
-// [94, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, SEMI / RBRACE]
-// [95, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, SEMI / RBRACE]
-// [96, type_ → • LPAREN RPAREN THIN_ARROW return_type, SEMI / RBRACE]
-// [97, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, SEMI / RBRACE]
-// [98, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, SEMI / RBRACE]
-// [127, qualified_uident_ → • UIDENT, QUESTION / SEMI / LBRACKET / RBRACE]
-// [128, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, QUESTION / SEMI / LBRACKET / RBRACE]
+// [72, type_sig → nonempty_list(attribute) PRIV ENUM type_decl_name_with_params LBRACE separated_list(SEMI,enum_constructor) • RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_206(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_487(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_PACKAGE_NAME => Shift(yy_state_34)
-    T_UIDENT => Shift(yy_state_36)
-    T_ASYNC => Shift(yy_state_37)
-    T_UNDERSCORE => Shift(yy_state_43)
-    T_AMPER => Shift(yy_state_44)
-    NT_qualified_uident_ => Shift(yy_state_46)
-    T_LPAREN => Shift(yy_state_51)
-    NT_simple_type => Shift(yy_state_73)
-    NT_type_ => Shift(yy_state_207)
+    T_RBRACE => Shift(yy_state_488)
     _ => Error
   }
 }
 
-// [73, record_decl_field → nonempty_list(attribute) boption(MUTABLE) LIDENT COLON type_ •, SEMI / RBRACE]
+// [72, type_sig → nonempty_list(attribute) PRIV ENUM type_decl_name_with_params LBRACE separated_list(SEMI,enum_constructor) RBRACE •, EOF / SEMI]
 
 ///|
-fn yy_state_207(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(5, NT_record_decl_field, yy_action_86)
+fn yy_state_488(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(7, NT_type_sig, yy_action_58)
 }
 
-// [72, record_decl_field → boption(MUTABLE) • LIDENT COLON type_, SEMI / RBRACE]
+// [60, type_sig → nonempty_list(attribute) PRIV STRUCT • type_decl_name_with_params LBRACE record_decl_body RBRACE, EOF / SEMI]
+// [66, type_sig → nonempty_list(attribute) PRIV STRUCT • type_decl_name_with_params LPAREN separated_list(COMMA,type_) RPAREN, EOF / SEMI]
+// [145, type_decl_name_with_params → • uident optional_type_params_no_constraints, LPAREN / LBRACE]
+// [187, uident → • UIDENT, LPAREN / LBRACKET / LBRACE]
 
 ///|
-fn yy_state_208(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_489(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LIDENT => Shift(yy_state_209)
+    T_UIDENT => Shift(yy_state_23)
+    NT_uident => Shift(yy_state_164)
+    NT_type_decl_name_with_params => Shift(yy_state_490)
     _ => Error
   }
 }
 
-// [72, record_decl_field → boption(MUTABLE) LIDENT • COLON type_, SEMI / RBRACE]
+// [60, type_sig → nonempty_list(attribute) PRIV STRUCT type_decl_name_with_params • LBRACE record_decl_body RBRACE, EOF / SEMI]
+// [66, type_sig → nonempty_list(attribute) PRIV STRUCT type_decl_name_with_params • LPAREN separated_list(COMMA,type_) RPAREN, EOF / SEMI]
 
 ///|
-fn yy_state_209(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_490(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_LPAREN => Shift(yy_state_491)
+    T_LBRACE => Shift(yy_state_494)
+    _ => Error
+  }
+}
+
+// [66, type_sig → nonempty_list(attribute) PRIV STRUCT type_decl_name_with_params LPAREN • separated_list(COMMA,type_) RPAREN, EOF / SEMI]
+// [146, simple_type → • simple_type QUESTION, RPAREN / COMMA / QUESTION]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, RPAREN / COMMA / QUESTION]
+// [148, simple_type → • LPAREN type_ RPAREN, RPAREN / COMMA / QUESTION]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, RPAREN / COMMA / QUESTION]
+// [150, simple_type → • AMPER qualified_uident_, RPAREN / COMMA / QUESTION]
+// [151, simple_type → • UNDERSCORE, RPAREN / COMMA / QUESTION]
+// [152, type_ → • simple_type, RPAREN / COMMA]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [185, qualified_uident_ → • UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
+// [205, separated_list(COMMA,type_) → •, RPAREN]
+// [206, separated_list(COMMA,type_) → • separated_nonempty_list(COMMA,type_), RPAREN]
+// [227, separated_nonempty_list(COMMA,type_) → • type_, RPAREN]
+// [228, separated_nonempty_list(COMMA,type_) → • type_ COMMA separated_nonempty_list(COMMA,type_), RPAREN]
+
+///|
+fn yy_state_491(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_210)
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    NT_type_ => Shift(yy_state_79)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_104)
+    NT_separated_nonempty_list_COMMA_type__ => Shift(yy_state_208)
+    NT_separated_list_COMMA_type__ => Shift(yy_state_492)
+    T_RPAREN => Reduce(0, NT_separated_list_COMMA_type__, yy_action_142)
     _ => Error
   }
 }
 
-// [72, record_decl_field → boption(MUTABLE) LIDENT COLON • type_, SEMI / RBRACE]
-// [84, simple_type → • simple_type QUESTION, QUESTION / SEMI / RBRACE]
-// [85, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, QUESTION / SEMI / RBRACE]
-// [86, simple_type → • LPAREN type_ RPAREN, QUESTION / SEMI / RBRACE]
-// [87, simple_type → • qualified_uident_ optional_type_arguments, QUESTION / SEMI / RBRACE]
-// [88, simple_type → • AMPER qualified_uident_, QUESTION / SEMI / RBRACE]
-// [89, simple_type → • UNDERSCORE, QUESTION / SEMI / RBRACE]
-// [90, type_ → • simple_type, SEMI / RBRACE]
-// [91, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, SEMI / RBRACE]
-// [92, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, SEMI / RBRACE]
-// [93, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, SEMI / RBRACE]
-// [94, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, SEMI / RBRACE]
-// [95, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, SEMI / RBRACE]
-// [96, type_ → • LPAREN RPAREN THIN_ARROW return_type, SEMI / RBRACE]
-// [97, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, SEMI / RBRACE]
-// [98, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, SEMI / RBRACE]
-// [127, qualified_uident_ → • UIDENT, QUESTION / SEMI / LBRACKET / RBRACE]
-// [128, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, QUESTION / SEMI / LBRACKET / RBRACE]
+// [66, type_sig → nonempty_list(attribute) PRIV STRUCT type_decl_name_with_params LPAREN separated_list(COMMA,type_) • RPAREN, EOF / SEMI]
 
 ///|
-fn yy_state_210(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_492(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_PACKAGE_NAME => Shift(yy_state_34)
-    T_UIDENT => Shift(yy_state_36)
-    T_ASYNC => Shift(yy_state_37)
-    T_UNDERSCORE => Shift(yy_state_43)
-    T_AMPER => Shift(yy_state_44)
-    NT_qualified_uident_ => Shift(yy_state_46)
-    T_LPAREN => Shift(yy_state_51)
-    NT_simple_type => Shift(yy_state_73)
-    NT_type_ => Shift(yy_state_211)
+    T_RPAREN => Shift(yy_state_493)
     _ => Error
   }
 }
 
-// [72, record_decl_field → boption(MUTABLE) LIDENT COLON type_ •, SEMI / RBRACE]
+// [66, type_sig → nonempty_list(attribute) PRIV STRUCT type_decl_name_with_params LPAREN separated_list(COMMA,type_) RPAREN •, EOF / SEMI]
 
 ///|
-fn yy_state_211(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(4, NT_record_decl_field, yy_action_85)
+fn yy_state_493(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(7, NT_type_sig, yy_action_57)
 }
 
-// [148, separated_list(SEMI,record_decl_field) → separated_nonempty_list(SEMI,record_decl_field) •, RBRACE]
+// [60, type_sig → nonempty_list(attribute) PRIV STRUCT type_decl_name_with_params LBRACE • record_decl_body RBRACE, EOF / SEMI]
+// [124, record_decl_field → • boption(MUTABLE) LIDENT COLON type_, SEMI / RBRACE]
+// [125, record_decl_field → • nonempty_list(attribute) boption(MUTABLE) LIDENT COLON type_, SEMI / RBRACE]
+// [126, record_decl_constr → • ASYNC FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, RBRACE]
+// [127, record_decl_constr → • FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, RBRACE]
+// [128, record_decl_constr → • nonempty_list(attribute) ASYNC FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, RBRACE]
+// [129, record_decl_constr → • nonempty_list(attribute) FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, RBRACE]
+// [130, record_decl_body → •, RBRACE]
+// [131, record_decl_body → • record_decl_constr, RBRACE]
+// [132, record_decl_body → • record_decl_body_nonempty, RBRACE]
+// [133, record_decl_body_nonempty → • record_decl_field SEMI record_decl_constr, RBRACE]
+// [134, record_decl_body_nonempty → • record_decl_field, RBRACE]
+// [135, record_decl_body_nonempty → • record_decl_field SEMI record_decl_body_nonempty, RBRACE]
+// [219, boption(MUTABLE) → •, LIDENT]
+// [220, boption(MUTABLE) → • MUTABLE, LIDENT]
+// [229, nonempty_list(attribute) → • ATTRIBUTE, LIDENT / ASYNC / FN / MUTABLE]
+// [230, nonempty_list(attribute) → • ATTRIBUTE nonempty_list(attribute), LIDENT / ASYNC / FN / MUTABLE]
 
 ///|
-fn yy_state_212(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_separated_list_SEMI_record_decl_field_, yy_action_84)
+fn yy_state_494(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_ATTRIBUTE => Shift(yy_state_17)
+    T_MUTABLE => Shift(yy_state_184)
+    NT_record_decl_field => Shift(yy_state_212)
+    T_FN => Shift(yy_state_216)
+    T_ASYNC => Shift(yy_state_232)
+    NT_nonempty_list_attribute_ => Shift(yy_state_242)
+    NT_boption_MUTABLE_ => Shift(yy_state_266)
+    NT_record_decl_body_nonempty => Shift(yy_state_270)
+    NT_record_decl_constr => Shift(yy_state_271)
+    NT_record_decl_body => Shift(yy_state_495)
+    T_RBRACE => Reduce(0, NT_record_decl_body, yy_action_139)
+    T_LIDENT => Reduce(0, NT_boption_MUTABLE_, yy_action_157)
+    _ => Error
+  }
 }
 
-// [43, type_sig → STRUCT type_decl_name_with_params LBRACE separated_list(SEMI,record_decl_field) • RBRACE, EOF / SEMI]
+// [60, type_sig → nonempty_list(attribute) PRIV STRUCT type_decl_name_with_params LBRACE record_decl_body • RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_213(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_495(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RBRACE => Shift(yy_state_214)
+    T_RBRACE => Shift(yy_state_496)
     _ => Error
   }
 }
 
-// [43, type_sig → STRUCT type_decl_name_with_params LBRACE separated_list(SEMI,record_decl_field) RBRACE •, EOF / SEMI]
+// [60, type_sig → nonempty_list(attribute) PRIV STRUCT type_decl_name_with_params LBRACE record_decl_body RBRACE •, EOF / SEMI]
 
 ///|
-fn yy_state_214(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(5, NT_type_sig, yy_action_83)
+fn yy_state_496(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(7, NT_type_sig, yy_action_56)
 }
 
-// [34, type_sig → SUBERROR • uident, EOF / SEMI]
-// [37, type_sig → SUBERROR • uident type_, EOF / SEMI]
-// [40, type_sig → SUBERROR • uident LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
-// [129, uident → • UIDENT, UIDENT / EOF / ASYNC / LPAREN / SEMI / UNDERSCORE / LBRACE / AMPER / PACKAGE_NAME]
+// [48, type_sig → nonempty_list(attribute) PRIV SUBERROR • uident option(type_), EOF / SEMI]
+// [54, type_sig → nonempty_list(attribute) PRIV SUBERROR • uident LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [187, uident → • UIDENT, UIDENT / EOF / ASYNC / LPAREN / SEMI / UNDERSCORE / LBRACE / AMPER / PACKAGE_NAME]
 
 ///|
-fn yy_state_215(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_497(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_31)
-    NT_uident => Shift(yy_state_216)
+    T_UIDENT => Shift(yy_state_23)
+    NT_uident => Shift(yy_state_498)
     _ => Error
   }
 }
 
-// [34, type_sig → SUBERROR uident •, EOF / SEMI]
-// [37, type_sig → SUBERROR uident • type_, EOF / SEMI]
-// [40, type_sig → SUBERROR uident • LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
-// [84, simple_type → • simple_type QUESTION, EOF / QUESTION / SEMI]
-// [85, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EOF / QUESTION / SEMI]
-// [86, simple_type → • LPAREN type_ RPAREN, EOF / QUESTION / SEMI]
-// [87, simple_type → • qualified_uident_ optional_type_arguments, EOF / QUESTION / SEMI]
-// [88, simple_type → • AMPER qualified_uident_, EOF / QUESTION / SEMI]
-// [89, simple_type → • UNDERSCORE, EOF / QUESTION / SEMI]
-// [90, type_ → • simple_type, EOF / SEMI]
-// [91, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [92, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [93, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [94, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [95, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [96, type_ → • LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [97, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [98, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [127, qualified_uident_ → • UIDENT, EOF / QUESTION / SEMI / LBRACKET]
-// [128, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EOF / QUESTION / SEMI / LBRACKET]
-
-///|
-fn yy_state_216(_lookahead : YYSymbol) -> YYDecision {
+// [48, type_sig → nonempty_list(attribute) PRIV SUBERROR uident • option(type_), EOF / SEMI]
+// [54, type_sig → nonempty_list(attribute) PRIV SUBERROR uident • LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [146, simple_type → • simple_type QUESTION, EOF / QUESTION / SEMI]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EOF / QUESTION / SEMI]
+// [148, simple_type → • LPAREN type_ RPAREN, EOF / QUESTION / SEMI]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, EOF / QUESTION / SEMI]
+// [150, simple_type → • AMPER qualified_uident_, EOF / QUESTION / SEMI]
+// [151, simple_type → • UNDERSCORE, EOF / QUESTION / SEMI]
+// [152, type_ → • simple_type, EOF / SEMI]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [185, qualified_uident_ → • UIDENT, EOF / QUESTION / SEMI / LBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EOF / QUESTION / SEMI / LBRACKET]
+// [201, option(type_) → •, EOF / SEMI]
+// [202, option(type_) → • type_, EOF / SEMI]
+
+///|
+fn yy_state_498(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_PACKAGE_NAME => Shift(yy_state_34)
-    T_UIDENT => Shift(yy_state_36)
-    T_ASYNC => Shift(yy_state_37)
-    T_UNDERSCORE => Shift(yy_state_43)
-    T_AMPER => Shift(yy_state_44)
-    NT_qualified_uident_ => Shift(yy_state_46)
-    T_LPAREN => Shift(yy_state_51)
-    NT_simple_type => Shift(yy_state_73)
-    T_LBRACE => Shift(yy_state_217)
-    NT_type_ => Shift(yy_state_220)
-    T_EOF | T_SEMI => Reduce(2, NT_type_sig, yy_action_82)
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_104)
+    NT_type_ => Shift(yy_state_276)
+    T_LBRACE => Shift(yy_state_499)
+    NT_option_type__ => Shift(yy_state_502)
+    T_EOF | T_SEMI => Reduce(0, NT_option_type__, yy_action_120)
     _ => Error
   }
 }
 
-// [40, type_sig → SUBERROR uident LBRACE • separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
-// [68, enum_constructor → • UIDENT option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) option(eq_tag), SEMI / RBRACE]
-// [69, enum_constructor → • nonempty_list(attribute) UIDENT option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) option(eq_tag), SEMI / RBRACE]
-// [145, separated_list(SEMI,enum_constructor) → •, RBRACE]
-// [146, separated_list(SEMI,enum_constructor) → • separated_nonempty_list(SEMI,enum_constructor), RBRACE]
-// [173, nonempty_list(attribute) → • ATTRIBUTE, UIDENT]
-// [174, nonempty_list(attribute) → • ATTRIBUTE nonempty_list(attribute), UIDENT]
-// [179, separated_nonempty_list(SEMI,enum_constructor) → • enum_constructor, RBRACE]
-// [180, separated_nonempty_list(SEMI,enum_constructor) → • enum_constructor SEMI separated_nonempty_list(SEMI,enum_constructor), RBRACE]
+// [54, type_sig → nonempty_list(attribute) PRIV SUBERROR uident LBRACE • separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [120, enum_constructor → • UIDENT option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) option(eq_tag), SEMI / RBRACE]
+// [121, enum_constructor → • nonempty_list(attribute) UIDENT option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) option(eq_tag), SEMI / RBRACE]
+// [203, separated_list(SEMI,enum_constructor) → •, RBRACE]
+// [204, separated_list(SEMI,enum_constructor) → • separated_nonempty_list(SEMI,enum_constructor), RBRACE]
+// [229, nonempty_list(attribute) → • ATTRIBUTE, UIDENT]
+// [230, nonempty_list(attribute) → • ATTRIBUTE nonempty_list(attribute), UIDENT]
+// [233, separated_nonempty_list(SEMI,enum_constructor) → • enum_constructor, RBRACE]
+// [234, separated_nonempty_list(SEMI,enum_constructor) → • enum_constructor SEMI separated_nonempty_list(SEMI,enum_constructor), RBRACE]
 
 ///|
-fn yy_state_217(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_499(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_enum_constructor => Shift(yy_state_165)
-    T_ATTRIBUTE => Shift(yy_state_168)
-    NT_nonempty_list_attribute_ => Shift(yy_state_169)
-    T_UIDENT => Shift(yy_state_187)
-    NT_separated_nonempty_list_SEMI_enum_constructor_ => Shift(yy_state_190)
-    NT_separated_list_SEMI_enum_constructor_ => Shift(yy_state_218)
+    T_ATTRIBUTE => Shift(yy_state_17)
+    NT_enum_constructor => Shift(yy_state_178)
+    NT_nonempty_list_attribute_ => Shift(yy_state_181)
+    T_UIDENT => Shift(yy_state_199)
+    NT_separated_nonempty_list_SEMI_enum_constructor_ => Shift(yy_state_202)
+    NT_separated_list_SEMI_enum_constructor_ => Shift(yy_state_500)
     T_RBRACE =>
-      Reduce(0, NT_separated_list_SEMI_enum_constructor_, yy_action_111)
+      Reduce(0, NT_separated_list_SEMI_enum_constructor_, yy_action_161)
     _ => Error
   }
 }
 
-// [40, type_sig → SUBERROR uident LBRACE separated_list(SEMI,enum_constructor) • RBRACE, EOF / SEMI]
+// [54, type_sig → nonempty_list(attribute) PRIV SUBERROR uident LBRACE separated_list(SEMI,enum_constructor) • RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_218(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_500(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RBRACE => Shift(yy_state_219)
+    T_RBRACE => Shift(yy_state_501)
     _ => Error
   }
 }
 
-// [40, type_sig → SUBERROR uident LBRACE separated_list(SEMI,enum_constructor) RBRACE •, EOF / SEMI]
+// [54, type_sig → nonempty_list(attribute) PRIV SUBERROR uident LBRACE separated_list(SEMI,enum_constructor) RBRACE •, EOF / SEMI]
 
 ///|
-fn yy_state_219(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(5, NT_type_sig, yy_action_81)
+fn yy_state_501(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(7, NT_type_sig, yy_action_55)
 }
 
-// [37, type_sig → SUBERROR uident type_ •, EOF / SEMI]
+// [48, type_sig → nonempty_list(attribute) PRIV SUBERROR uident option(type_) •, EOF / SEMI]
 
 ///|
-fn yy_state_220(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_type_sig, yy_action_80)
+fn yy_state_502(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(5, NT_type_sig, yy_action_54)
 }
 
-// [28, type_sig → TYPE • type_decl_name_with_params, EOF / SEMI]
-// [31, type_sig → TYPE • type_decl_name_with_params type_, EOF / SEMI]
-// [83, type_decl_name_with_params → • uident optional_type_params_no_constraints, UIDENT / EOF / ASYNC / LPAREN / SEMI / UNDERSCORE / AMPER / PACKAGE_NAME]
-// [129, uident → • UIDENT, UIDENT / EOF / ASYNC / LPAREN / SEMI / LBRACKET / UNDERSCORE / AMPER / PACKAGE_NAME]
+// [42, type_sig → nonempty_list(attribute) PRIV TYPE • type_decl_name_with_params, EOF / SEMI]
+// [104, alias_sig → nonempty_list(attribute) PRIV TYPE • type_decl_name_with_params EQUAL type_, EOF / SEMI]
+// [145, type_decl_name_with_params → • uident optional_type_params_no_constraints, EOF / EQUAL / SEMI]
+// [187, uident → • UIDENT, EOF / EQUAL / SEMI / LBRACKET]
 
 ///|
-fn yy_state_221(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_503(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_31)
-    NT_uident => Shift(yy_state_91)
-    NT_type_decl_name_with_params => Shift(yy_state_222)
+    T_UIDENT => Shift(yy_state_23)
+    NT_uident => Shift(yy_state_164)
+    NT_type_decl_name_with_params => Shift(yy_state_504)
     _ => Error
   }
 }
 
-// [28, type_sig → TYPE type_decl_name_with_params •, EOF / SEMI]
-// [31, type_sig → TYPE type_decl_name_with_params • type_, EOF / SEMI]
-// [84, simple_type → • simple_type QUESTION, EOF / QUESTION / SEMI]
-// [85, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EOF / QUESTION / SEMI]
-// [86, simple_type → • LPAREN type_ RPAREN, EOF / QUESTION / SEMI]
-// [87, simple_type → • qualified_uident_ optional_type_arguments, EOF / QUESTION / SEMI]
-// [88, simple_type → • AMPER qualified_uident_, EOF / QUESTION / SEMI]
-// [89, simple_type → • UNDERSCORE, EOF / QUESTION / SEMI]
-// [90, type_ → • simple_type, EOF / SEMI]
-// [91, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [92, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [93, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [94, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [95, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [96, type_ → • LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [97, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [98, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [127, qualified_uident_ → • UIDENT, EOF / QUESTION / SEMI / LBRACKET]
-// [128, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EOF / QUESTION / SEMI / LBRACKET]
+// [42, type_sig → nonempty_list(attribute) PRIV TYPE type_decl_name_with_params •, EOF / SEMI]
+// [104, alias_sig → nonempty_list(attribute) PRIV TYPE type_decl_name_with_params • EQUAL type_, EOF / SEMI]
 
 ///|
-fn yy_state_222(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_504(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_PACKAGE_NAME => Shift(yy_state_34)
-    T_UIDENT => Shift(yy_state_36)
-    T_ASYNC => Shift(yy_state_37)
-    T_UNDERSCORE => Shift(yy_state_43)
-    T_AMPER => Shift(yy_state_44)
-    NT_qualified_uident_ => Shift(yy_state_46)
-    T_LPAREN => Shift(yy_state_51)
-    NT_simple_type => Shift(yy_state_73)
-    NT_type_ => Shift(yy_state_223)
-    T_EOF | T_SEMI => Reduce(2, NT_type_sig, yy_action_79)
+    T_EQUAL => Shift(yy_state_505)
+    T_EOF | T_SEMI => Reduce(4, NT_type_sig, yy_action_53)
     _ => Error
   }
 }
 
-// [31, type_sig → TYPE type_decl_name_with_params type_ •, EOF / SEMI]
-
-///|
-fn yy_state_223(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_type_sig, yy_action_78)
-}
-
-// [27, type_sig → PUB • pub_attr EXTERN TYPE type_decl_name_with_params, EOF / SEMI]
-// [30, type_sig → PUB • pub_attr TYPE type_decl_name_with_params, EOF / SEMI]
-// [33, type_sig → PUB • pub_attr TYPE type_decl_name_with_params type_, EOF / SEMI]
-// [36, type_sig → PUB • pub_attr SUBERROR uident, EOF / SEMI]
-// [39, type_sig → PUB • pub_attr SUBERROR uident type_, EOF / SEMI]
-// [42, type_sig → PUB • pub_attr SUBERROR uident LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
-// [45, type_sig → PUB • pub_attr STRUCT type_decl_name_with_params LBRACE separated_list(SEMI,record_decl_field) RBRACE, EOF / SEMI]
-// [48, type_sig → PUB • pub_attr STRUCT type_decl_name_with_params LPAREN separated_list(COMMA,type_) RPAREN, EOF / SEMI]
-// [51, type_sig → PUB • pub_attr ENUM type_decl_name_with_params LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
-// [57, trait_sig → PUB • pub_attr TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
-// [60, trait_sig → PUB • pub_attr TRAIT uident, EOF / SEMI]
-// [63, alias_sig → PUB • pub_attr TYPEALIAS type_ AS type_decl_name_with_params, EOF / SEMI]
-// [66, alias_sig → PUB • pub_attr TRAITALIAS qualified_uident AS uident, EOF / SEMI]
-// [122, pub_attr → •, EXTERN / STRUCT / ENUM / TRAIT / TYPEALIAS / TRAITALIAS / TYPE / SUBERROR]
-// [123, pub_attr → • LPAREN READONLY RPAREN, EXTERN / STRUCT / ENUM / TRAIT / TYPEALIAS / TRAITALIAS / TYPE / SUBERROR]
-// [124, pub_attr → • LPAREN LIDENT RPAREN, EXTERN / STRUCT / ENUM / TRAIT / TYPEALIAS / TRAITALIAS / TYPE / SUBERROR]
-
-///|
-fn yy_state_224(_lookahead : YYSymbol) -> YYDecision {
+// [104, alias_sig → nonempty_list(attribute) PRIV TYPE type_decl_name_with_params EQUAL • type_, EOF / SEMI]
+// [146, simple_type → • simple_type QUESTION, EOF / QUESTION / SEMI]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EOF / QUESTION / SEMI]
+// [148, simple_type → • LPAREN type_ RPAREN, EOF / QUESTION / SEMI]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, EOF / QUESTION / SEMI]
+// [150, simple_type → • AMPER qualified_uident_, EOF / QUESTION / SEMI]
+// [151, simple_type → • UNDERSCORE, EOF / QUESTION / SEMI]
+// [152, type_ → • simple_type, EOF / SEMI]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [185, qualified_uident_ → • UIDENT, EOF / QUESTION / SEMI / LBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EOF / QUESTION / SEMI / LBRACKET]
+
+///|
+fn yy_state_505(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LPAREN => Shift(yy_state_225)
-    NT_pub_attr => Shift(yy_state_230)
-    T_EXTERN
-    | T_STRUCT
-    | T_ENUM
-    | T_TRAIT
-    | T_TYPEALIAS
-    | T_TRAITALIAS
-    | T_TYPE
-    | T_SUBERROR => Reduce(0, NT_pub_attr, yy_action_77)
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_104)
+    NT_type_ => Shift(yy_state_506)
     _ => Error
   }
 }
 
-// [123, pub_attr → LPAREN • READONLY RPAREN, EXTERN / STRUCT / ENUM / TRAIT / TYPEALIAS / TRAITALIAS / TYPE / SUBERROR]
-// [124, pub_attr → LPAREN • LIDENT RPAREN, EXTERN / STRUCT / ENUM / TRAIT / TYPEALIAS / TRAITALIAS / TYPE / SUBERROR]
+// [104, alias_sig → nonempty_list(attribute) PRIV TYPE type_decl_name_with_params EQUAL type_ •, EOF / SEMI]
 
 ///|
-fn yy_state_225(_lookahead : YYSymbol) -> YYDecision {
-  match _lookahead {
-    T_LIDENT => Shift(yy_state_226)
-    T_READONLY => Shift(yy_state_228)
-    _ => Error
-  }
+fn yy_state_506(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(6, NT_alias_sig, yy_action_52)
 }
 
-// [124, pub_attr → LPAREN LIDENT • RPAREN, EXTERN / STRUCT / ENUM / TRAIT / TYPEALIAS / TRAITALIAS / TYPE / SUBERROR]
+// [26, value_sig → nonempty_list(attribute) PRIV LET • lident COLON type_, EOF / SEMI]
+// [188, lident → • LIDENT, COLON]
 
 ///|
-fn yy_state_226(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_507(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RPAREN => Shift(yy_state_227)
+    T_LIDENT => Shift(yy_state_36)
+    NT_lident => Shift(yy_state_508)
     _ => Error
   }
 }
 
-// [124, pub_attr → LPAREN LIDENT RPAREN •, EXTERN / STRUCT / ENUM / TRAIT / TYPEALIAS / TRAITALIAS / TYPE / SUBERROR]
-
-///|
-fn yy_state_227(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_pub_attr, yy_action_76)
-}
-
-// [123, pub_attr → LPAREN READONLY • RPAREN, EXTERN / STRUCT / ENUM / TRAIT / TYPEALIAS / TRAITALIAS / TYPE / SUBERROR]
+// [26, value_sig → nonempty_list(attribute) PRIV LET lident • COLON type_, EOF / SEMI]
 
 ///|
-fn yy_state_228(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_508(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RPAREN => Shift(yy_state_229)
+    T_COLON => Shift(yy_state_509)
     _ => Error
   }
 }
 
-// [123, pub_attr → LPAREN READONLY RPAREN •, EXTERN / STRUCT / ENUM / TRAIT / TYPEALIAS / TRAITALIAS / TYPE / SUBERROR]
-
-///|
-fn yy_state_229(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_pub_attr, yy_action_75)
-}
-
-// [27, type_sig → PUB pub_attr • EXTERN TYPE type_decl_name_with_params, EOF / SEMI]
-// [30, type_sig → PUB pub_attr • TYPE type_decl_name_with_params, EOF / SEMI]
-// [33, type_sig → PUB pub_attr • TYPE type_decl_name_with_params type_, EOF / SEMI]
-// [36, type_sig → PUB pub_attr • SUBERROR uident, EOF / SEMI]
-// [39, type_sig → PUB pub_attr • SUBERROR uident type_, EOF / SEMI]
-// [42, type_sig → PUB pub_attr • SUBERROR uident LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
-// [45, type_sig → PUB pub_attr • STRUCT type_decl_name_with_params LBRACE separated_list(SEMI,record_decl_field) RBRACE, EOF / SEMI]
-// [48, type_sig → PUB pub_attr • STRUCT type_decl_name_with_params LPAREN separated_list(COMMA,type_) RPAREN, EOF / SEMI]
-// [51, type_sig → PUB pub_attr • ENUM type_decl_name_with_params LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
-// [57, trait_sig → PUB pub_attr • TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
-// [60, trait_sig → PUB pub_attr • TRAIT uident, EOF / SEMI]
-// [63, alias_sig → PUB pub_attr • TYPEALIAS type_ AS type_decl_name_with_params, EOF / SEMI]
-// [66, alias_sig → PUB pub_attr • TRAITALIAS qualified_uident AS uident, EOF / SEMI]
-
-///|
-fn yy_state_230(_lookahead : YYSymbol) -> YYDecision {
+// [26, value_sig → nonempty_list(attribute) PRIV LET lident COLON • type_, EOF / SEMI]
+// [146, simple_type → • simple_type QUESTION, EOF / QUESTION / SEMI]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EOF / QUESTION / SEMI]
+// [148, simple_type → • LPAREN type_ RPAREN, EOF / QUESTION / SEMI]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, EOF / QUESTION / SEMI]
+// [150, simple_type → • AMPER qualified_uident_, EOF / QUESTION / SEMI]
+// [151, simple_type → • UNDERSCORE, EOF / QUESTION / SEMI]
+// [152, type_ → • simple_type, EOF / SEMI]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [185, qualified_uident_ → • UIDENT, EOF / QUESTION / SEMI / LBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EOF / QUESTION / SEMI / LBRACKET]
+
+///|
+fn yy_state_509(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_TRAITALIAS => Shift(yy_state_231)
-    T_TYPEALIAS => Shift(yy_state_235)
-    T_TRAIT => Shift(yy_state_239)
-    T_ENUM => Shift(yy_state_245)
-    T_STRUCT => Shift(yy_state_250)
-    T_SUBERROR => Shift(yy_state_258)
-    T_TYPE => Shift(yy_state_264)
-    T_EXTERN => Shift(yy_state_267)
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_104)
+    NT_type_ => Shift(yy_state_510)
     _ => Error
   }
 }
 
-// [66, alias_sig → PUB pub_attr TRAITALIAS • qualified_uident AS uident, EOF / SEMI]
-// [125, qualified_uident → • UIDENT, AS]
-// [126, qualified_uident → • PACKAGE_NAME DOT_UIDENT, AS]
+// [26, value_sig → nonempty_list(attribute) PRIV LET lident COLON type_ •, EOF / SEMI]
 
 ///|
-fn yy_state_231(_lookahead : YYSymbol) -> YYDecision {
-  match _lookahead {
-    T_PACKAGE_NAME => Shift(yy_state_21)
-    T_UIDENT => Shift(yy_state_23)
-    NT_qualified_uident => Shift(yy_state_232)
-    _ => Error
-  }
+fn yy_state_510(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(6, NT_value_sig, yy_action_51)
 }
 
-// [66, alias_sig → PUB pub_attr TRAITALIAS qualified_uident • AS uident, EOF / SEMI]
+// [20, const_sig → nonempty_list(attribute) PRIV CONST • uident COLON type_ EQUAL constant, EOF / SEMI]
+// [187, uident → • UIDENT, COLON]
 
 ///|
-fn yy_state_232(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_511(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_AS => Shift(yy_state_233)
+    T_UIDENT => Shift(yy_state_23)
+    NT_uident => Shift(yy_state_512)
     _ => Error
   }
 }
 
-// [66, alias_sig → PUB pub_attr TRAITALIAS qualified_uident AS • uident, EOF / SEMI]
-// [129, uident → • UIDENT, EOF / SEMI]
+// [20, const_sig → nonempty_list(attribute) PRIV CONST uident • COLON type_ EQUAL constant, EOF / SEMI]
 
 ///|
-fn yy_state_233(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_512(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_31)
-    NT_uident => Shift(yy_state_234)
+    T_COLON => Shift(yy_state_513)
     _ => Error
   }
 }
 
-// [66, alias_sig → PUB pub_attr TRAITALIAS qualified_uident AS uident •, EOF / SEMI]
-
-///|
-fn yy_state_234(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(6, NT_alias_sig, yy_action_74)
-}
-
-// [63, alias_sig → PUB pub_attr TYPEALIAS • type_ AS type_decl_name_with_params, EOF / SEMI]
-// [84, simple_type → • simple_type QUESTION, QUESTION / AS]
-// [85, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, QUESTION / AS]
-// [86, simple_type → • LPAREN type_ RPAREN, QUESTION / AS]
-// [87, simple_type → • qualified_uident_ optional_type_arguments, QUESTION / AS]
-// [88, simple_type → • AMPER qualified_uident_, QUESTION / AS]
-// [89, simple_type → • UNDERSCORE, QUESTION / AS]
-// [90, type_ → • simple_type, AS]
-// [91, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, AS]
-// [92, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, AS]
-// [93, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, AS]
-// [94, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, AS]
-// [95, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, AS]
-// [96, type_ → • LPAREN RPAREN THIN_ARROW return_type, AS]
-// [97, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, AS]
-// [98, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, AS]
-// [127, qualified_uident_ → • UIDENT, QUESTION / LBRACKET / AS]
-// [128, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, QUESTION / LBRACKET / AS]
-
-///|
-fn yy_state_235(_lookahead : YYSymbol) -> YYDecision {
+// [20, const_sig → nonempty_list(attribute) PRIV CONST uident COLON • type_ EQUAL constant, EOF / SEMI]
+// [146, simple_type → • simple_type QUESTION, EQUAL / QUESTION]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EQUAL / QUESTION]
+// [148, simple_type → • LPAREN type_ RPAREN, EQUAL / QUESTION]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, EQUAL / QUESTION]
+// [150, simple_type → • AMPER qualified_uident_, EQUAL / QUESTION]
+// [151, simple_type → • UNDERSCORE, EQUAL / QUESTION]
+// [152, type_ → • simple_type, EQUAL]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EQUAL]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EQUAL]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EQUAL]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EQUAL]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EQUAL]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, EQUAL]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EQUAL]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EQUAL]
+// [185, qualified_uident_ → • UIDENT, EQUAL / QUESTION / LBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EQUAL / QUESTION / LBRACKET]
+
+///|
+fn yy_state_513(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_PACKAGE_NAME => Shift(yy_state_34)
-    T_UIDENT => Shift(yy_state_36)
-    T_ASYNC => Shift(yy_state_37)
-    T_UNDERSCORE => Shift(yy_state_43)
-    T_AMPER => Shift(yy_state_44)
-    NT_qualified_uident_ => Shift(yy_state_46)
-    T_LPAREN => Shift(yy_state_51)
-    NT_simple_type => Shift(yy_state_73)
-    NT_type_ => Shift(yy_state_236)
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_104)
+    NT_type_ => Shift(yy_state_514)
     _ => Error
   }
 }
 
-// [63, alias_sig → PUB pub_attr TYPEALIAS type_ • AS type_decl_name_with_params, EOF / SEMI]
+// [20, const_sig → nonempty_list(attribute) PRIV CONST uident COLON type_ • EQUAL constant, EOF / SEMI]
 
 ///|
-fn yy_state_236(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_514(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_AS => Shift(yy_state_237)
+    T_EQUAL => Shift(yy_state_515)
     _ => Error
   }
 }
 
-// [63, alias_sig → PUB pub_attr TYPEALIAS type_ AS • type_decl_name_with_params, EOF / SEMI]
-// [83, type_decl_name_with_params → • uident optional_type_params_no_constraints, EOF / SEMI]
-// [129, uident → • UIDENT, EOF / SEMI / LBRACKET]
+// [20, const_sig → nonempty_list(attribute) PRIV CONST uident COLON type_ EQUAL • constant, EOF / SEMI]
+// [171, constant → • TRUE, EOF / SEMI]
+// [172, constant → • FALSE, EOF / SEMI]
+// [173, constant → • BYTE, EOF / SEMI]
+// [174, constant → • BYTES, EOF / SEMI]
+// [175, constant → • CHAR, EOF / SEMI]
+// [176, constant → • INT, EOF / SEMI]
+// [177, constant → • FLOAT, EOF / SEMI]
+// [178, constant → • DOUBLE, EOF / SEMI]
+// [179, constant → • STRING, EOF / SEMI]
 
 ///|
-fn yy_state_237(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_515(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_31)
-    NT_uident => Shift(yy_state_91)
-    NT_type_decl_name_with_params => Shift(yy_state_238)
+    T_STRING => Shift(yy_state_448)
+    T_DOUBLE => Shift(yy_state_449)
+    T_FLOAT => Shift(yy_state_450)
+    T_INT => Shift(yy_state_451)
+    T_CHAR => Shift(yy_state_452)
+    T_BYTES => Shift(yy_state_453)
+    T_BYTE => Shift(yy_state_454)
+    T_FALSE => Shift(yy_state_455)
+    T_TRUE => Shift(yy_state_456)
+    NT_constant => Shift(yy_state_516)
     _ => Error
   }
 }
 
-// [63, alias_sig → PUB pub_attr TYPEALIAS type_ AS type_decl_name_with_params •, EOF / SEMI]
+// [20, const_sig → nonempty_list(attribute) PRIV CONST uident COLON type_ EQUAL constant •, EOF / SEMI]
 
 ///|
-fn yy_state_238(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(6, NT_alias_sig, yy_action_73)
+fn yy_state_516(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(8, NT_const_sig, yy_action_50)
 }
 
-// [57, trait_sig → PUB pub_attr TRAIT • uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
-// [60, trait_sig → PUB pub_attr TRAIT • uident, EOF / SEMI]
-// [129, uident → • UIDENT, EOF / COLON / SEMI / LBRACE]
+// [19, const_sig → nonempty_list(attribute) CONST • uident COLON type_ EQUAL constant, EOF / SEMI]
+// [187, uident → • UIDENT, COLON]
 
 ///|
-fn yy_state_239(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_517(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_31)
-    NT_uident => Shift(yy_state_240)
+    T_UIDENT => Shift(yy_state_23)
+    NT_uident => Shift(yy_state_518)
     _ => Error
   }
 }
 
-// [57, trait_sig → PUB pub_attr TRAIT uident • loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
-// [60, trait_sig → PUB pub_attr TRAIT uident •, EOF / SEMI]
-// [153, loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) → •, LBRACE]
-// [154, loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) → • COLON separated_nonempty_list(PLUS,qualified_uident), LBRACE]
+// [19, const_sig → nonempty_list(attribute) CONST uident • COLON type_ EQUAL constant, EOF / SEMI]
 
 ///|
-fn yy_state_240(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_518(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_106)
-    NT_loption_preceded_COLON_separated_nonempty_list_PLUS_qualified_uident___ =>
-      Shift(yy_state_241)
-    T_LBRACE =>
-      Reduce(
-        0,
-        NT_loption_preceded_COLON_separated_nonempty_list_PLUS_qualified_uident___,
-        yy_action_144,
-      )
-    T_EOF | T_SEMI => Reduce(4, NT_trait_sig, yy_action_72)
+    T_COLON => Shift(yy_state_519)
     _ => Error
   }
 }
 
-// [57, trait_sig → PUB pub_attr TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) • LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
-
-///|
-fn yy_state_241(_lookahead : YYSymbol) -> YYDecision {
+// [19, const_sig → nonempty_list(attribute) CONST uident COLON • type_ EQUAL constant, EOF / SEMI]
+// [146, simple_type → • simple_type QUESTION, EQUAL / QUESTION]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EQUAL / QUESTION]
+// [148, simple_type → • LPAREN type_ RPAREN, EQUAL / QUESTION]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, EQUAL / QUESTION]
+// [150, simple_type → • AMPER qualified_uident_, EQUAL / QUESTION]
+// [151, simple_type → • UNDERSCORE, EQUAL / QUESTION]
+// [152, type_ → • simple_type, EQUAL]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EQUAL]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EQUAL]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EQUAL]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EQUAL]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EQUAL]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, EQUAL]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EQUAL]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EQUAL]
+// [185, qualified_uident_ → • UIDENT, EQUAL / QUESTION / LBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EQUAL / QUESTION / LBRACKET]
+
+///|
+fn yy_state_519(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACE => Shift(yy_state_242)
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_104)
+    NT_type_ => Shift(yy_state_520)
     _ => Error
   }
 }
 
-// [24, trait_method_sig → • lident LPAREN separated_list(COMMA,trait_method_parameter) RPAREN THIN_ARROW return_type boption(eq_underscore), SEMI / RBRACE]
-// [57, trait_sig → PUB pub_attr TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE • separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
-// [130, lident → • LIDENT, LPAREN]
-// [155, separated_nonempty_list(SEMI,trait_method_sig) → • trait_method_sig, RBRACE]
-// [156, separated_nonempty_list(SEMI,trait_method_sig) → • trait_method_sig SEMI separated_nonempty_list(SEMI,trait_method_sig), RBRACE]
+// [19, const_sig → nonempty_list(attribute) CONST uident COLON type_ • EQUAL constant, EOF / SEMI]
 
 ///|
-fn yy_state_242(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_520(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LIDENT => Shift(yy_state_26)
-    NT_trait_method_sig => Shift(yy_state_113)
-    NT_lident => Shift(yy_state_116)
-    NT_separated_nonempty_list_SEMI_trait_method_sig_ => Shift(yy_state_243)
+    T_EQUAL => Shift(yy_state_521)
     _ => Error
   }
 }
 
-// [57, trait_sig → PUB pub_attr TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) • RBRACE, EOF / SEMI]
+// [19, const_sig → nonempty_list(attribute) CONST uident COLON type_ EQUAL • constant, EOF / SEMI]
+// [171, constant → • TRUE, EOF / SEMI]
+// [172, constant → • FALSE, EOF / SEMI]
+// [173, constant → • BYTE, EOF / SEMI]
+// [174, constant → • BYTES, EOF / SEMI]
+// [175, constant → • CHAR, EOF / SEMI]
+// [176, constant → • INT, EOF / SEMI]
+// [177, constant → • FLOAT, EOF / SEMI]
+// [178, constant → • DOUBLE, EOF / SEMI]
+// [179, constant → • STRING, EOF / SEMI]
 
 ///|
-fn yy_state_243(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_521(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RBRACE => Shift(yy_state_244)
+    T_STRING => Shift(yy_state_448)
+    T_DOUBLE => Shift(yy_state_449)
+    T_FLOAT => Shift(yy_state_450)
+    T_INT => Shift(yy_state_451)
+    T_CHAR => Shift(yy_state_452)
+    T_BYTES => Shift(yy_state_453)
+    T_BYTE => Shift(yy_state_454)
+    T_FALSE => Shift(yy_state_455)
+    T_TRUE => Shift(yy_state_456)
+    NT_constant => Shift(yy_state_522)
     _ => Error
   }
 }
 
-// [57, trait_sig → PUB pub_attr TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE •, EOF / SEMI]
+// [19, const_sig → nonempty_list(attribute) CONST uident COLON type_ EQUAL constant •, EOF / SEMI]
 
 ///|
-fn yy_state_244(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(8, NT_trait_sig, yy_action_71)
+fn yy_state_522(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(7, NT_const_sig, yy_action_48)
 }
 
-// [51, type_sig → PUB pub_attr ENUM • type_decl_name_with_params LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
-// [83, type_decl_name_with_params → • uident optional_type_params_no_constraints, LBRACE]
-// [129, uident → • UIDENT, LBRACKET / LBRACE]
+// [18, const_sig → PUB • pub_attr CONST uident COLON type_ EQUAL constant, EOF / SEMI]
+// [24, value_sig → PUB • pub_attr LET lident COLON type_, EOF / SEMI]
+// [40, type_sig → PUB • pub_attr TYPE type_decl_name_with_params, EOF / SEMI]
+// [46, type_sig → PUB • pub_attr SUBERROR uident option(type_), EOF / SEMI]
+// [52, type_sig → PUB • pub_attr SUBERROR uident LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [58, type_sig → PUB • pub_attr STRUCT type_decl_name_with_params LBRACE record_decl_body RBRACE, EOF / SEMI]
+// [64, type_sig → PUB • pub_attr STRUCT type_decl_name_with_params LPAREN separated_list(COMMA,type_) RPAREN, EOF / SEMI]
+// [70, type_sig → PUB • pub_attr ENUM type_decl_name_with_params LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [76, impl_sig → PUB • pub_attr IMPL type_params_with_constraints qualified_uident FOR type_, EOF / SEMI]
+// [82, impl_sig → PUB • pub_attr IMPL qualified_uident FOR type_, EOF / SEMI]
+// [88, trait_sig → PUB • pub_attr TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
+// [94, trait_sig → PUB • pub_attr TRAIT uident, EOF / SEMI]
+// [102, alias_sig → PUB • pub_attr TYPE type_decl_name_with_params EQUAL type_, EOF / SEMI]
+// [110, alias_sig → PUB • pub_attr USING PACKAGE_NAME LBRACE TYPE uident using_binder RBRACE, EOF / SEMI]
+// [116, alias_sig → PUB • pub_attr USING PACKAGE_NAME LBRACE TRAIT uident using_binder RBRACE, EOF / SEMI]
+// [180, pub_attr → •, STRUCT / ENUM / TRAIT / IMPL / LET / CONST / TYPE / SUBERROR / USING]
+// [181, pub_attr → • LPAREN READONLY RPAREN, STRUCT / ENUM / TRAIT / IMPL / LET / CONST / TYPE / SUBERROR / USING]
+// [182, pub_attr → • LPAREN LIDENT RPAREN, STRUCT / ENUM / TRAIT / IMPL / LET / CONST / TYPE / SUBERROR / USING]
 
 ///|
-fn yy_state_245(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_523(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_31)
-    NT_uident => Shift(yy_state_91)
-    NT_type_decl_name_with_params => Shift(yy_state_246)
+    T_LPAREN => Shift(yy_state_385)
+    NT_pub_attr => Shift(yy_state_524)
+    T_STRUCT
+    | T_ENUM
+    | T_TRAIT
+    | T_IMPL
+    | T_LET
+    | T_CONST
+    | T_TYPE
+    | T_SUBERROR
+    | T_USING => Reduce(0, NT_pub_attr, yy_action_91)
     _ => Error
   }
 }
 
-// [51, type_sig → PUB pub_attr ENUM type_decl_name_with_params • LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [18, const_sig → PUB pub_attr • CONST uident COLON type_ EQUAL constant, EOF / SEMI]
+// [24, value_sig → PUB pub_attr • LET lident COLON type_, EOF / SEMI]
+// [40, type_sig → PUB pub_attr • TYPE type_decl_name_with_params, EOF / SEMI]
+// [46, type_sig → PUB pub_attr • SUBERROR uident option(type_), EOF / SEMI]
+// [52, type_sig → PUB pub_attr • SUBERROR uident LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [58, type_sig → PUB pub_attr • STRUCT type_decl_name_with_params LBRACE record_decl_body RBRACE, EOF / SEMI]
+// [64, type_sig → PUB pub_attr • STRUCT type_decl_name_with_params LPAREN separated_list(COMMA,type_) RPAREN, EOF / SEMI]
+// [70, type_sig → PUB pub_attr • ENUM type_decl_name_with_params LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [76, impl_sig → PUB pub_attr • IMPL type_params_with_constraints qualified_uident FOR type_, EOF / SEMI]
+// [82, impl_sig → PUB pub_attr • IMPL qualified_uident FOR type_, EOF / SEMI]
+// [88, trait_sig → PUB pub_attr • TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
+// [94, trait_sig → PUB pub_attr • TRAIT uident, EOF / SEMI]
+// [102, alias_sig → PUB pub_attr • TYPE type_decl_name_with_params EQUAL type_, EOF / SEMI]
+// [110, alias_sig → PUB pub_attr • USING PACKAGE_NAME LBRACE TYPE uident using_binder RBRACE, EOF / SEMI]
+// [116, alias_sig → PUB pub_attr • USING PACKAGE_NAME LBRACE TRAIT uident using_binder RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_246(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_524(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACE => Shift(yy_state_247)
+    T_USING => Shift(yy_state_525)
+    T_TRAIT => Shift(yy_state_536)
+    T_IMPL => Shift(yy_state_542)
+    T_ENUM => Shift(yy_state_550)
+    T_STRUCT => Shift(yy_state_555)
+    T_SUBERROR => Shift(yy_state_563)
+    T_TYPE => Shift(yy_state_569)
+    T_LET => Shift(yy_state_573)
+    T_CONST => Shift(yy_state_577)
     _ => Error
   }
 }
 
-// [51, type_sig → PUB pub_attr ENUM type_decl_name_with_params LBRACE • separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
-// [68, enum_constructor → • UIDENT option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) option(eq_tag), SEMI / RBRACE]
-// [69, enum_constructor → • nonempty_list(attribute) UIDENT option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) option(eq_tag), SEMI / RBRACE]
-// [145, separated_list(SEMI,enum_constructor) → •, RBRACE]
-// [146, separated_list(SEMI,enum_constructor) → • separated_nonempty_list(SEMI,enum_constructor), RBRACE]
-// [173, nonempty_list(attribute) → • ATTRIBUTE, UIDENT]
-// [174, nonempty_list(attribute) → • ATTRIBUTE nonempty_list(attribute), UIDENT]
-// [179, separated_nonempty_list(SEMI,enum_constructor) → • enum_constructor, RBRACE]
-// [180, separated_nonempty_list(SEMI,enum_constructor) → • enum_constructor SEMI separated_nonempty_list(SEMI,enum_constructor), RBRACE]
+// [110, alias_sig → PUB pub_attr USING • PACKAGE_NAME LBRACE TYPE uident using_binder RBRACE, EOF / SEMI]
+// [116, alias_sig → PUB pub_attr USING • PACKAGE_NAME LBRACE TRAIT uident using_binder RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_247(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_525(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_enum_constructor => Shift(yy_state_165)
-    T_ATTRIBUTE => Shift(yy_state_168)
-    NT_nonempty_list_attribute_ => Shift(yy_state_169)
-    T_UIDENT => Shift(yy_state_187)
-    NT_separated_nonempty_list_SEMI_enum_constructor_ => Shift(yy_state_190)
-    NT_separated_list_SEMI_enum_constructor_ => Shift(yy_state_248)
-    T_RBRACE =>
-      Reduce(0, NT_separated_list_SEMI_enum_constructor_, yy_action_111)
+    T_PACKAGE_NAME => Shift(yy_state_526)
     _ => Error
   }
 }
 
-// [51, type_sig → PUB pub_attr ENUM type_decl_name_with_params LBRACE separated_list(SEMI,enum_constructor) • RBRACE, EOF / SEMI]
+// [110, alias_sig → PUB pub_attr USING PACKAGE_NAME • LBRACE TYPE uident using_binder RBRACE, EOF / SEMI]
+// [116, alias_sig → PUB pub_attr USING PACKAGE_NAME • LBRACE TRAIT uident using_binder RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_248(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_526(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RBRACE => Shift(yy_state_249)
+    T_LBRACE => Shift(yy_state_527)
     _ => Error
   }
 }
 
-// [51, type_sig → PUB pub_attr ENUM type_decl_name_with_params LBRACE separated_list(SEMI,enum_constructor) RBRACE •, EOF / SEMI]
+// [110, alias_sig → PUB pub_attr USING PACKAGE_NAME LBRACE • TYPE uident using_binder RBRACE, EOF / SEMI]
+// [116, alias_sig → PUB pub_attr USING PACKAGE_NAME LBRACE • TRAIT uident using_binder RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_249(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(7, NT_type_sig, yy_action_70)
+fn yy_state_527(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_TRAIT => Shift(yy_state_528)
+    T_TYPE => Shift(yy_state_532)
+    _ => Error
+  }
 }
 
-// [45, type_sig → PUB pub_attr STRUCT • type_decl_name_with_params LBRACE separated_list(SEMI,record_decl_field) RBRACE, EOF / SEMI]
-// [48, type_sig → PUB pub_attr STRUCT • type_decl_name_with_params LPAREN separated_list(COMMA,type_) RPAREN, EOF / SEMI]
-// [83, type_decl_name_with_params → • uident optional_type_params_no_constraints, LPAREN / LBRACE]
-// [129, uident → • UIDENT, LPAREN / LBRACKET / LBRACE]
+// [116, alias_sig → PUB pub_attr USING PACKAGE_NAME LBRACE TRAIT • uident using_binder RBRACE, EOF / SEMI]
+// [187, uident → • UIDENT, RBRACE / AS]
 
 ///|
-fn yy_state_250(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_528(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_31)
-    NT_uident => Shift(yy_state_91)
-    NT_type_decl_name_with_params => Shift(yy_state_251)
+    T_UIDENT => Shift(yy_state_23)
+    NT_uident => Shift(yy_state_529)
     _ => Error
   }
 }
 
-// [45, type_sig → PUB pub_attr STRUCT type_decl_name_with_params • LBRACE separated_list(SEMI,record_decl_field) RBRACE, EOF / SEMI]
-// [48, type_sig → PUB pub_attr STRUCT type_decl_name_with_params • LPAREN separated_list(COMMA,type_) RPAREN, EOF / SEMI]
+// [98, using_binder → •, RBRACE]
+// [99, using_binder → • AS uident, RBRACE]
+// [116, alias_sig → PUB pub_attr USING PACKAGE_NAME LBRACE TRAIT uident • using_binder RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_251(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_529(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LPAREN => Shift(yy_state_252)
-    T_LBRACE => Shift(yy_state_255)
+    T_AS => Shift(yy_state_27)
+    NT_using_binder => Shift(yy_state_530)
+    T_RBRACE => Reduce(0, NT_using_binder, yy_action_243)
     _ => Error
   }
 }
 
-// [48, type_sig → PUB pub_attr STRUCT type_decl_name_with_params LPAREN • separated_list(COMMA,type_) RPAREN, EOF / SEMI]
-// [84, simple_type → • simple_type QUESTION, RPAREN / COMMA / QUESTION]
-// [85, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, RPAREN / COMMA / QUESTION]
-// [86, simple_type → • LPAREN type_ RPAREN, RPAREN / COMMA / QUESTION]
-// [87, simple_type → • qualified_uident_ optional_type_arguments, RPAREN / COMMA / QUESTION]
-// [88, simple_type → • AMPER qualified_uident_, RPAREN / COMMA / QUESTION]
-// [89, simple_type → • UNDERSCORE, RPAREN / COMMA / QUESTION]
-// [90, type_ → • simple_type, RPAREN / COMMA]
-// [91, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [92, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [93, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [94, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [95, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [96, type_ → • LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [97, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [98, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [127, qualified_uident_ → • UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
-// [128, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
-// [149, separated_list(COMMA,type_) → •, RPAREN]
-// [150, separated_list(COMMA,type_) → • separated_nonempty_list(COMMA,type_), RPAREN]
-// [171, separated_nonempty_list(COMMA,type_) → • type_, RPAREN]
-// [172, separated_nonempty_list(COMMA,type_) → • type_ COMMA separated_nonempty_list(COMMA,type_), RPAREN]
+// [116, alias_sig → PUB pub_attr USING PACKAGE_NAME LBRACE TRAIT uident using_binder • RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_252(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_530(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_PACKAGE_NAME => Shift(yy_state_34)
-    T_UIDENT => Shift(yy_state_36)
-    T_ASYNC => Shift(yy_state_37)
-    T_UNDERSCORE => Shift(yy_state_43)
-    T_AMPER => Shift(yy_state_44)
-    NT_qualified_uident_ => Shift(yy_state_46)
-    NT_type_ => Shift(yy_state_48)
-    T_LPAREN => Shift(yy_state_51)
-    NT_simple_type => Shift(yy_state_73)
-    NT_separated_nonempty_list_COMMA_type__ => Shift(yy_state_196)
-    NT_separated_list_COMMA_type__ => Shift(yy_state_253)
-    T_RPAREN => Reduce(0, NT_separated_list_COMMA_type__, yy_action_92)
+    T_RBRACE => Shift(yy_state_531)
     _ => Error
   }
 }
 
-// [48, type_sig → PUB pub_attr STRUCT type_decl_name_with_params LPAREN separated_list(COMMA,type_) • RPAREN, EOF / SEMI]
+// [116, alias_sig → PUB pub_attr USING PACKAGE_NAME LBRACE TRAIT uident using_binder RBRACE •, EOF / SEMI]
 
 ///|
-fn yy_state_253(_lookahead : YYSymbol) -> YYDecision {
-  match _lookahead {
-    T_RPAREN => Shift(yy_state_254)
-    _ => Error
-  }
+fn yy_state_531(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(9, NT_alias_sig, yy_action_47)
 }
 
-// [48, type_sig → PUB pub_attr STRUCT type_decl_name_with_params LPAREN separated_list(COMMA,type_) RPAREN •, EOF / SEMI]
+// [110, alias_sig → PUB pub_attr USING PACKAGE_NAME LBRACE TYPE • uident using_binder RBRACE, EOF / SEMI]
+// [187, uident → • UIDENT, RBRACE / AS]
 
 ///|
-fn yy_state_254(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(7, NT_type_sig, yy_action_69)
+fn yy_state_532(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_UIDENT => Shift(yy_state_23)
+    NT_uident => Shift(yy_state_533)
+    _ => Error
+  }
 }
 
-// [45, type_sig → PUB pub_attr STRUCT type_decl_name_with_params LBRACE • separated_list(SEMI,record_decl_field) RBRACE, EOF / SEMI]
-// [72, record_decl_field → • boption(MUTABLE) LIDENT COLON type_, SEMI / RBRACE]
-// [73, record_decl_field → • nonempty_list(attribute) boption(MUTABLE) LIDENT COLON type_, SEMI / RBRACE]
-// [147, separated_list(SEMI,record_decl_field) → •, RBRACE]
-// [148, separated_list(SEMI,record_decl_field) → • separated_nonempty_list(SEMI,record_decl_field), RBRACE]
-// [163, boption(MUTABLE) → •, LIDENT]
-// [164, boption(MUTABLE) → • MUTABLE, LIDENT]
-// [173, nonempty_list(attribute) → • ATTRIBUTE, LIDENT / MUTABLE]
-// [174, nonempty_list(attribute) → • ATTRIBUTE nonempty_list(attribute), LIDENT / MUTABLE]
-// [181, separated_nonempty_list(SEMI,record_decl_field) → • record_decl_field, RBRACE]
-// [182, separated_nonempty_list(SEMI,record_decl_field) → • record_decl_field SEMI separated_nonempty_list(SEMI,record_decl_field), RBRACE]
+// [98, using_binder → •, RBRACE]
+// [99, using_binder → • AS uident, RBRACE]
+// [110, alias_sig → PUB pub_attr USING PACKAGE_NAME LBRACE TYPE uident • using_binder RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_255(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_533(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_ATTRIBUTE => Shift(yy_state_168)
-    T_MUTABLE => Shift(yy_state_172)
-    NT_record_decl_field => Shift(yy_state_200)
-    NT_nonempty_list_attribute_ => Shift(yy_state_203)
-    NT_boption_MUTABLE_ => Shift(yy_state_208)
-    NT_separated_nonempty_list_SEMI_record_decl_field_ => Shift(yy_state_212)
-    NT_separated_list_SEMI_record_decl_field_ => Shift(yy_state_256)
-    T_RBRACE =>
-      Reduce(0, NT_separated_list_SEMI_record_decl_field_, yy_action_89)
-    T_LIDENT => Reduce(0, NT_boption_MUTABLE_, yy_action_107)
+    T_AS => Shift(yy_state_27)
+    NT_using_binder => Shift(yy_state_534)
+    T_RBRACE => Reduce(0, NT_using_binder, yy_action_243)
     _ => Error
   }
 }
 
-// [45, type_sig → PUB pub_attr STRUCT type_decl_name_with_params LBRACE separated_list(SEMI,record_decl_field) • RBRACE, EOF / SEMI]
+// [110, alias_sig → PUB pub_attr USING PACKAGE_NAME LBRACE TYPE uident using_binder • RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_256(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_534(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RBRACE => Shift(yy_state_257)
+    T_RBRACE => Shift(yy_state_535)
     _ => Error
   }
 }
 
-// [45, type_sig → PUB pub_attr STRUCT type_decl_name_with_params LBRACE separated_list(SEMI,record_decl_field) RBRACE •, EOF / SEMI]
+// [110, alias_sig → PUB pub_attr USING PACKAGE_NAME LBRACE TYPE uident using_binder RBRACE •, EOF / SEMI]
 
 ///|
-fn yy_state_257(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(7, NT_type_sig, yy_action_68)
+fn yy_state_535(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(9, NT_alias_sig, yy_action_46)
 }
 
-// [36, type_sig → PUB pub_attr SUBERROR • uident, EOF / SEMI]
-// [39, type_sig → PUB pub_attr SUBERROR • uident type_, EOF / SEMI]
-// [42, type_sig → PUB pub_attr SUBERROR • uident LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
-// [129, uident → • UIDENT, UIDENT / EOF / ASYNC / LPAREN / SEMI / UNDERSCORE / LBRACE / AMPER / PACKAGE_NAME]
+// [88, trait_sig → PUB pub_attr TRAIT • uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
+// [94, trait_sig → PUB pub_attr TRAIT • uident, EOF / SEMI]
+// [187, uident → • UIDENT, EOF / COLON / SEMI / LBRACE]
 
 ///|
-fn yy_state_258(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_536(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_31)
-    NT_uident => Shift(yy_state_259)
+    T_UIDENT => Shift(yy_state_23)
+    NT_uident => Shift(yy_state_537)
     _ => Error
   }
 }
 
-// [36, type_sig → PUB pub_attr SUBERROR uident •, EOF / SEMI]
-// [39, type_sig → PUB pub_attr SUBERROR uident • type_, EOF / SEMI]
-// [42, type_sig → PUB pub_attr SUBERROR uident • LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
-// [84, simple_type → • simple_type QUESTION, EOF / QUESTION / SEMI]
-// [85, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EOF / QUESTION / SEMI]
-// [86, simple_type → • LPAREN type_ RPAREN, EOF / QUESTION / SEMI]
-// [87, simple_type → • qualified_uident_ optional_type_arguments, EOF / QUESTION / SEMI]
-// [88, simple_type → • AMPER qualified_uident_, EOF / QUESTION / SEMI]
-// [89, simple_type → • UNDERSCORE, EOF / QUESTION / SEMI]
-// [90, type_ → • simple_type, EOF / SEMI]
-// [91, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [92, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [93, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [94, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [95, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [96, type_ → • LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [97, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [98, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [127, qualified_uident_ → • UIDENT, EOF / QUESTION / SEMI / LBRACKET]
-// [128, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EOF / QUESTION / SEMI / LBRACKET]
+// [88, trait_sig → PUB pub_attr TRAIT uident • loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
+// [94, trait_sig → PUB pub_attr TRAIT uident •, EOF / SEMI]
+// [209, loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) → •, LBRACE]
+// [210, loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) → • COLON separated_nonempty_list(PLUS,qualified_uident), LBRACE]
 
 ///|
-fn yy_state_259(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_537(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_PACKAGE_NAME => Shift(yy_state_34)
-    T_UIDENT => Shift(yy_state_36)
-    T_ASYNC => Shift(yy_state_37)
-    T_UNDERSCORE => Shift(yy_state_43)
-    T_AMPER => Shift(yy_state_44)
-    NT_qualified_uident_ => Shift(yy_state_46)
-    T_LPAREN => Shift(yy_state_51)
-    NT_simple_type => Shift(yy_state_73)
-    T_LBRACE => Shift(yy_state_260)
-    NT_type_ => Shift(yy_state_263)
-    T_EOF | T_SEMI => Reduce(4, NT_type_sig, yy_action_67)
+    T_COLON => Shift(yy_state_40)
+    NT_loption_preceded_COLON_separated_nonempty_list_PLUS_qualified_uident___ =>
+      Shift(yy_state_538)
+    T_LBRACE =>
+      Reduce(
+        0,
+        NT_loption_preceded_COLON_separated_nonempty_list_PLUS_qualified_uident___,
+        yy_action_236,
+      )
+    T_EOF | T_SEMI => Reduce(4, NT_trait_sig, yy_action_45)
     _ => Error
   }
 }
 
-// [42, type_sig → PUB pub_attr SUBERROR uident LBRACE • separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
-// [68, enum_constructor → • UIDENT option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) option(eq_tag), SEMI / RBRACE]
-// [69, enum_constructor → • nonempty_list(attribute) UIDENT option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) option(eq_tag), SEMI / RBRACE]
-// [145, separated_list(SEMI,enum_constructor) → •, RBRACE]
-// [146, separated_list(SEMI,enum_constructor) → • separated_nonempty_list(SEMI,enum_constructor), RBRACE]
-// [173, nonempty_list(attribute) → • ATTRIBUTE, UIDENT]
-// [174, nonempty_list(attribute) → • ATTRIBUTE nonempty_list(attribute), UIDENT]
-// [179, separated_nonempty_list(SEMI,enum_constructor) → • enum_constructor, RBRACE]
-// [180, separated_nonempty_list(SEMI,enum_constructor) → • enum_constructor SEMI separated_nonempty_list(SEMI,enum_constructor), RBRACE]
+// [88, trait_sig → PUB pub_attr TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) • LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_260(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_538(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_enum_constructor => Shift(yy_state_165)
-    T_ATTRIBUTE => Shift(yy_state_168)
-    NT_nonempty_list_attribute_ => Shift(yy_state_169)
-    T_UIDENT => Shift(yy_state_187)
-    NT_separated_nonempty_list_SEMI_enum_constructor_ => Shift(yy_state_190)
-    NT_separated_list_SEMI_enum_constructor_ => Shift(yy_state_261)
-    T_RBRACE =>
-      Reduce(0, NT_separated_list_SEMI_enum_constructor_, yy_action_111)
+    T_LBRACE => Shift(yy_state_539)
     _ => Error
   }
 }
 
-// [42, type_sig → PUB pub_attr SUBERROR uident LBRACE separated_list(SEMI,enum_constructor) • RBRACE, EOF / SEMI]
+// [36, trait_method_sig → • lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type boption(eq_underscore), SEMI / RBRACE]
+// [37, trait_method_sig → • nonempty_list(attribute) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type boption(eq_underscore), SEMI / RBRACE]
+// [88, trait_sig → PUB pub_attr TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE • separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
+// [188, lident → • LIDENT, LPAREN]
+// [211, separated_nonempty_list(SEMI,trait_method_sig) → • trait_method_sig, RBRACE]
+// [212, separated_nonempty_list(SEMI,trait_method_sig) → • trait_method_sig SEMI separated_nonempty_list(SEMI,trait_method_sig), RBRACE]
+// [229, nonempty_list(attribute) → • ATTRIBUTE, LIDENT]
+// [230, nonempty_list(attribute) → • ATTRIBUTE nonempty_list(attribute), LIDENT]
 
 ///|
-fn yy_state_261(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_539(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RBRACE => Shift(yy_state_262)
+    T_ATTRIBUTE => Shift(yy_state_17)
+    T_LIDENT => Shift(yy_state_36)
+    NT_trait_method_sig => Shift(yy_state_50)
+    NT_nonempty_list_attribute_ => Shift(yy_state_53)
+    NT_lident => Shift(yy_state_132)
+    NT_separated_nonempty_list_SEMI_trait_method_sig_ => Shift(yy_state_540)
     _ => Error
   }
 }
 
-// [42, type_sig → PUB pub_attr SUBERROR uident LBRACE separated_list(SEMI,enum_constructor) RBRACE •, EOF / SEMI]
+// [88, trait_sig → PUB pub_attr TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) • RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_262(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(7, NT_type_sig, yy_action_66)
+fn yy_state_540(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_RBRACE => Shift(yy_state_541)
+    _ => Error
+  }
 }
 
-// [39, type_sig → PUB pub_attr SUBERROR uident type_ •, EOF / SEMI]
+// [88, trait_sig → PUB pub_attr TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE •, EOF / SEMI]
 
 ///|
-fn yy_state_263(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(5, NT_type_sig, yy_action_65)
+fn yy_state_541(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(8, NT_trait_sig, yy_action_44)
 }
 
-// [30, type_sig → PUB pub_attr TYPE • type_decl_name_with_params, EOF / SEMI]
-// [33, type_sig → PUB pub_attr TYPE • type_decl_name_with_params type_, EOF / SEMI]
-// [83, type_decl_name_with_params → • uident optional_type_params_no_constraints, UIDENT / EOF / ASYNC / LPAREN / SEMI / UNDERSCORE / AMPER / PACKAGE_NAME]
-// [129, uident → • UIDENT, UIDENT / EOF / ASYNC / LPAREN / SEMI / LBRACKET / UNDERSCORE / AMPER / PACKAGE_NAME]
+// [76, impl_sig → PUB pub_attr IMPL • type_params_with_constraints qualified_uident FOR type_, EOF / SEMI]
+// [82, impl_sig → PUB pub_attr IMPL • qualified_uident FOR type_, EOF / SEMI]
+// [138, type_params_with_constraints → • LBRACKET separated_list(COMMA,type_param_with_constraints) RBRACKET, UIDENT / PACKAGE_NAME]
+// [183, qualified_uident → • UIDENT, FOR]
+// [184, qualified_uident → • PACKAGE_NAME DOT_UIDENT, FOR]
 
 ///|
-fn yy_state_264(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_542(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_31)
-    NT_uident => Shift(yy_state_91)
-    NT_type_decl_name_with_params => Shift(yy_state_265)
+    T_PACKAGE_NAME => Shift(yy_state_45)
+    T_UIDENT => Shift(yy_state_47)
+    T_LBRACKET => Shift(yy_state_142)
+    NT_qualified_uident => Shift(yy_state_543)
+    NT_type_params_with_constraints => Shift(yy_state_546)
     _ => Error
   }
 }
 
-// [30, type_sig → PUB pub_attr TYPE type_decl_name_with_params •, EOF / SEMI]
-// [33, type_sig → PUB pub_attr TYPE type_decl_name_with_params • type_, EOF / SEMI]
-// [84, simple_type → • simple_type QUESTION, EOF / QUESTION / SEMI]
-// [85, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EOF / QUESTION / SEMI]
-// [86, simple_type → • LPAREN type_ RPAREN, EOF / QUESTION / SEMI]
-// [87, simple_type → • qualified_uident_ optional_type_arguments, EOF / QUESTION / SEMI]
-// [88, simple_type → • AMPER qualified_uident_, EOF / QUESTION / SEMI]
-// [89, simple_type → • UNDERSCORE, EOF / QUESTION / SEMI]
-// [90, type_ → • simple_type, EOF / SEMI]
-// [91, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [92, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [93, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [94, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [95, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [96, type_ → • LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [97, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [98, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [127, qualified_uident_ → • UIDENT, EOF / QUESTION / SEMI / LBRACKET]
-// [128, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EOF / QUESTION / SEMI / LBRACKET]
+// [82, impl_sig → PUB pub_attr IMPL qualified_uident • FOR type_, EOF / SEMI]
 
 ///|
-fn yy_state_265(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_543(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_FOR => Shift(yy_state_544)
+    _ => Error
+  }
+}
+
+// [82, impl_sig → PUB pub_attr IMPL qualified_uident FOR • type_, EOF / SEMI]
+// [146, simple_type → • simple_type QUESTION, EOF / QUESTION / SEMI]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EOF / QUESTION / SEMI]
+// [148, simple_type → • LPAREN type_ RPAREN, EOF / QUESTION / SEMI]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, EOF / QUESTION / SEMI]
+// [150, simple_type → • AMPER qualified_uident_, EOF / QUESTION / SEMI]
+// [151, simple_type → • UNDERSCORE, EOF / QUESTION / SEMI]
+// [152, type_ → • simple_type, EOF / SEMI]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [185, qualified_uident_ → • UIDENT, EOF / QUESTION / SEMI / LBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EOF / QUESTION / SEMI / LBRACKET]
+
+///|
+fn yy_state_544(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_PACKAGE_NAME => Shift(yy_state_34)
-    T_UIDENT => Shift(yy_state_36)
-    T_ASYNC => Shift(yy_state_37)
-    T_UNDERSCORE => Shift(yy_state_43)
-    T_AMPER => Shift(yy_state_44)
-    NT_qualified_uident_ => Shift(yy_state_46)
-    T_LPAREN => Shift(yy_state_51)
-    NT_simple_type => Shift(yy_state_73)
-    NT_type_ => Shift(yy_state_266)
-    T_EOF | T_SEMI => Reduce(4, NT_type_sig, yy_action_64)
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_104)
+    NT_type_ => Shift(yy_state_545)
     _ => Error
   }
 }
 
-// [33, type_sig → PUB pub_attr TYPE type_decl_name_with_params type_ •, EOF / SEMI]
+// [82, impl_sig → PUB pub_attr IMPL qualified_uident FOR type_ •, EOF / SEMI]
 
 ///|
-fn yy_state_266(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(5, NT_type_sig, yy_action_63)
+fn yy_state_545(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(6, NT_impl_sig, yy_action_43)
 }
 
-// [27, type_sig → PUB pub_attr EXTERN • TYPE type_decl_name_with_params, EOF / SEMI]
+// [76, impl_sig → PUB pub_attr IMPL type_params_with_constraints • qualified_uident FOR type_, EOF / SEMI]
+// [183, qualified_uident → • UIDENT, FOR]
+// [184, qualified_uident → • PACKAGE_NAME DOT_UIDENT, FOR]
 
 ///|
-fn yy_state_267(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_546(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_TYPE => Shift(yy_state_268)
+    T_PACKAGE_NAME => Shift(yy_state_45)
+    T_UIDENT => Shift(yy_state_47)
+    NT_qualified_uident => Shift(yy_state_547)
     _ => Error
   }
 }
 
-// [27, type_sig → PUB pub_attr EXTERN TYPE • type_decl_name_with_params, EOF / SEMI]
-// [83, type_decl_name_with_params → • uident optional_type_params_no_constraints, EOF / SEMI]
-// [129, uident → • UIDENT, EOF / SEMI / LBRACKET]
+// [76, impl_sig → PUB pub_attr IMPL type_params_with_constraints qualified_uident • FOR type_, EOF / SEMI]
 
 ///|
-fn yy_state_268(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_547(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_31)
-    NT_uident => Shift(yy_state_91)
-    NT_type_decl_name_with_params => Shift(yy_state_269)
+    T_FOR => Shift(yy_state_548)
     _ => Error
   }
 }
 
-// [27, type_sig → PUB pub_attr EXTERN TYPE type_decl_name_with_params •, EOF / SEMI]
-
-///|
-fn yy_state_269(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(5, NT_type_sig, yy_action_61)
+// [76, impl_sig → PUB pub_attr IMPL type_params_with_constraints qualified_uident FOR • type_, EOF / SEMI]
+// [146, simple_type → • simple_type QUESTION, EOF / QUESTION / SEMI]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EOF / QUESTION / SEMI]
+// [148, simple_type → • LPAREN type_ RPAREN, EOF / QUESTION / SEMI]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, EOF / QUESTION / SEMI]
+// [150, simple_type → • AMPER qualified_uident_, EOF / QUESTION / SEMI]
+// [151, simple_type → • UNDERSCORE, EOF / QUESTION / SEMI]
+// [152, type_ → • simple_type, EOF / SEMI]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [185, qualified_uident_ → • UIDENT, EOF / QUESTION / SEMI / LBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EOF / QUESTION / SEMI / LBRACKET]
+
+///|
+fn yy_state_548(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_104)
+    NT_type_ => Shift(yy_state_549)
+    _ => Error
+  }
 }
 
-// [26, type_sig → PRIV • EXTERN TYPE type_decl_name_with_params, EOF / SEMI]
-// [29, type_sig → PRIV • TYPE type_decl_name_with_params, EOF / SEMI]
-// [32, type_sig → PRIV • TYPE type_decl_name_with_params type_, EOF / SEMI]
-// [35, type_sig → PRIV • SUBERROR uident, EOF / SEMI]
-// [38, type_sig → PRIV • SUBERROR uident type_, EOF / SEMI]
-// [41, type_sig → PRIV • SUBERROR uident LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
-// [44, type_sig → PRIV • STRUCT type_decl_name_with_params LBRACE separated_list(SEMI,record_decl_field) RBRACE, EOF / SEMI]
-// [47, type_sig → PRIV • STRUCT type_decl_name_with_params LPAREN separated_list(COMMA,type_) RPAREN, EOF / SEMI]
-// [50, type_sig → PRIV • ENUM type_decl_name_with_params LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
-// [56, trait_sig → PRIV • TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
-// [59, trait_sig → PRIV • TRAIT uident, EOF / SEMI]
-// [62, alias_sig → PRIV • TYPEALIAS type_ AS type_decl_name_with_params, EOF / SEMI]
-// [65, alias_sig → PRIV • TRAITALIAS qualified_uident AS uident, EOF / SEMI]
+// [76, impl_sig → PUB pub_attr IMPL type_params_with_constraints qualified_uident FOR type_ •, EOF / SEMI]
 
 ///|
-fn yy_state_270(_lookahead : YYSymbol) -> YYDecision {
-  match _lookahead {
-    T_TRAITALIAS => Shift(yy_state_271)
-    T_TYPEALIAS => Shift(yy_state_275)
-    T_TRAIT => Shift(yy_state_279)
-    T_ENUM => Shift(yy_state_285)
-    T_STRUCT => Shift(yy_state_290)
-    T_SUBERROR => Shift(yy_state_298)
-    T_TYPE => Shift(yy_state_304)
-    T_EXTERN => Shift(yy_state_307)
-    _ => Error
-  }
+fn yy_state_549(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(7, NT_impl_sig, yy_action_42)
 }
 
-// [65, alias_sig → PRIV TRAITALIAS • qualified_uident AS uident, EOF / SEMI]
-// [125, qualified_uident → • UIDENT, AS]
-// [126, qualified_uident → • PACKAGE_NAME DOT_UIDENT, AS]
+// [70, type_sig → PUB pub_attr ENUM • type_decl_name_with_params LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [145, type_decl_name_with_params → • uident optional_type_params_no_constraints, LBRACE]
+// [187, uident → • UIDENT, LBRACKET / LBRACE]
 
 ///|
-fn yy_state_271(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_550(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_PACKAGE_NAME => Shift(yy_state_21)
     T_UIDENT => Shift(yy_state_23)
-    NT_qualified_uident => Shift(yy_state_272)
+    NT_uident => Shift(yy_state_164)
+    NT_type_decl_name_with_params => Shift(yy_state_551)
     _ => Error
   }
 }
 
-// [65, alias_sig → PRIV TRAITALIAS qualified_uident • AS uident, EOF / SEMI]
+// [70, type_sig → PUB pub_attr ENUM type_decl_name_with_params • LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_272(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_551(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_AS => Shift(yy_state_273)
+    T_LBRACE => Shift(yy_state_552)
     _ => Error
   }
 }
 
-// [65, alias_sig → PRIV TRAITALIAS qualified_uident AS • uident, EOF / SEMI]
-// [129, uident → • UIDENT, EOF / SEMI]
+// [70, type_sig → PUB pub_attr ENUM type_decl_name_with_params LBRACE • separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [120, enum_constructor → • UIDENT option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) option(eq_tag), SEMI / RBRACE]
+// [121, enum_constructor → • nonempty_list(attribute) UIDENT option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) option(eq_tag), SEMI / RBRACE]
+// [203, separated_list(SEMI,enum_constructor) → •, RBRACE]
+// [204, separated_list(SEMI,enum_constructor) → • separated_nonempty_list(SEMI,enum_constructor), RBRACE]
+// [229, nonempty_list(attribute) → • ATTRIBUTE, UIDENT]
+// [230, nonempty_list(attribute) → • ATTRIBUTE nonempty_list(attribute), UIDENT]
+// [233, separated_nonempty_list(SEMI,enum_constructor) → • enum_constructor, RBRACE]
+// [234, separated_nonempty_list(SEMI,enum_constructor) → • enum_constructor SEMI separated_nonempty_list(SEMI,enum_constructor), RBRACE]
 
 ///|
-fn yy_state_273(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_552(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_31)
-    NT_uident => Shift(yy_state_274)
+    T_ATTRIBUTE => Shift(yy_state_17)
+    NT_enum_constructor => Shift(yy_state_178)
+    NT_nonempty_list_attribute_ => Shift(yy_state_181)
+    T_UIDENT => Shift(yy_state_199)
+    NT_separated_nonempty_list_SEMI_enum_constructor_ => Shift(yy_state_202)
+    NT_separated_list_SEMI_enum_constructor_ => Shift(yy_state_553)
+    T_RBRACE =>
+      Reduce(0, NT_separated_list_SEMI_enum_constructor_, yy_action_161)
     _ => Error
   }
 }
 
-// [65, alias_sig → PRIV TRAITALIAS qualified_uident AS uident •, EOF / SEMI]
+// [70, type_sig → PUB pub_attr ENUM type_decl_name_with_params LBRACE separated_list(SEMI,enum_constructor) • RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_274(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(5, NT_alias_sig, yy_action_60)
-}
-
-// [62, alias_sig → PRIV TYPEALIAS • type_ AS type_decl_name_with_params, EOF / SEMI]
-// [84, simple_type → • simple_type QUESTION, QUESTION / AS]
-// [85, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, QUESTION / AS]
-// [86, simple_type → • LPAREN type_ RPAREN, QUESTION / AS]
-// [87, simple_type → • qualified_uident_ optional_type_arguments, QUESTION / AS]
-// [88, simple_type → • AMPER qualified_uident_, QUESTION / AS]
-// [89, simple_type → • UNDERSCORE, QUESTION / AS]
-// [90, type_ → • simple_type, AS]
-// [91, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, AS]
-// [92, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, AS]
-// [93, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, AS]
-// [94, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, AS]
-// [95, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, AS]
-// [96, type_ → • LPAREN RPAREN THIN_ARROW return_type, AS]
-// [97, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, AS]
-// [98, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, AS]
-// [127, qualified_uident_ → • UIDENT, QUESTION / LBRACKET / AS]
-// [128, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, QUESTION / LBRACKET / AS]
-
-///|
-fn yy_state_275(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_553(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_PACKAGE_NAME => Shift(yy_state_34)
-    T_UIDENT => Shift(yy_state_36)
-    T_ASYNC => Shift(yy_state_37)
-    T_UNDERSCORE => Shift(yy_state_43)
-    T_AMPER => Shift(yy_state_44)
-    NT_qualified_uident_ => Shift(yy_state_46)
-    T_LPAREN => Shift(yy_state_51)
-    NT_simple_type => Shift(yy_state_73)
-    NT_type_ => Shift(yy_state_276)
+    T_RBRACE => Shift(yy_state_554)
     _ => Error
   }
 }
 
-// [62, alias_sig → PRIV TYPEALIAS type_ • AS type_decl_name_with_params, EOF / SEMI]
+// [70, type_sig → PUB pub_attr ENUM type_decl_name_with_params LBRACE separated_list(SEMI,enum_constructor) RBRACE •, EOF / SEMI]
 
 ///|
-fn yy_state_276(_lookahead : YYSymbol) -> YYDecision {
-  match _lookahead {
-    T_AS => Shift(yy_state_277)
-    _ => Error
-  }
+fn yy_state_554(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(7, NT_type_sig, yy_action_41)
 }
 
-// [62, alias_sig → PRIV TYPEALIAS type_ AS • type_decl_name_with_params, EOF / SEMI]
-// [83, type_decl_name_with_params → • uident optional_type_params_no_constraints, EOF / SEMI]
-// [129, uident → • UIDENT, EOF / SEMI / LBRACKET]
+// [58, type_sig → PUB pub_attr STRUCT • type_decl_name_with_params LBRACE record_decl_body RBRACE, EOF / SEMI]
+// [64, type_sig → PUB pub_attr STRUCT • type_decl_name_with_params LPAREN separated_list(COMMA,type_) RPAREN, EOF / SEMI]
+// [145, type_decl_name_with_params → • uident optional_type_params_no_constraints, LPAREN / LBRACE]
+// [187, uident → • UIDENT, LPAREN / LBRACKET / LBRACE]
 
 ///|
-fn yy_state_277(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_555(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_31)
-    NT_uident => Shift(yy_state_91)
-    NT_type_decl_name_with_params => Shift(yy_state_278)
+    T_UIDENT => Shift(yy_state_23)
+    NT_uident => Shift(yy_state_164)
+    NT_type_decl_name_with_params => Shift(yy_state_556)
     _ => Error
   }
 }
 
-// [62, alias_sig → PRIV TYPEALIAS type_ AS type_decl_name_with_params •, EOF / SEMI]
+// [58, type_sig → PUB pub_attr STRUCT type_decl_name_with_params • LBRACE record_decl_body RBRACE, EOF / SEMI]
+// [64, type_sig → PUB pub_attr STRUCT type_decl_name_with_params • LPAREN separated_list(COMMA,type_) RPAREN, EOF / SEMI]
 
 ///|
-fn yy_state_278(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(5, NT_alias_sig, yy_action_59)
+fn yy_state_556(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_LPAREN => Shift(yy_state_557)
+    T_LBRACE => Shift(yy_state_560)
+    _ => Error
+  }
 }
 
-// [56, trait_sig → PRIV TRAIT • uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
-// [59, trait_sig → PRIV TRAIT • uident, EOF / SEMI]
-// [129, uident → • UIDENT, EOF / COLON / SEMI / LBRACE]
-
-///|
-fn yy_state_279(_lookahead : YYSymbol) -> YYDecision {
+// [64, type_sig → PUB pub_attr STRUCT type_decl_name_with_params LPAREN • separated_list(COMMA,type_) RPAREN, EOF / SEMI]
+// [146, simple_type → • simple_type QUESTION, RPAREN / COMMA / QUESTION]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, RPAREN / COMMA / QUESTION]
+// [148, simple_type → • LPAREN type_ RPAREN, RPAREN / COMMA / QUESTION]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, RPAREN / COMMA / QUESTION]
+// [150, simple_type → • AMPER qualified_uident_, RPAREN / COMMA / QUESTION]
+// [151, simple_type → • UNDERSCORE, RPAREN / COMMA / QUESTION]
+// [152, type_ → • simple_type, RPAREN / COMMA]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [185, qualified_uident_ → • UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
+// [205, separated_list(COMMA,type_) → •, RPAREN]
+// [206, separated_list(COMMA,type_) → • separated_nonempty_list(COMMA,type_), RPAREN]
+// [227, separated_nonempty_list(COMMA,type_) → • type_, RPAREN]
+// [228, separated_nonempty_list(COMMA,type_) → • type_ COMMA separated_nonempty_list(COMMA,type_), RPAREN]
+
+///|
+fn yy_state_557(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_31)
-    NT_uident => Shift(yy_state_280)
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    NT_type_ => Shift(yy_state_79)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_104)
+    NT_separated_nonempty_list_COMMA_type__ => Shift(yy_state_208)
+    NT_separated_list_COMMA_type__ => Shift(yy_state_558)
+    T_RPAREN => Reduce(0, NT_separated_list_COMMA_type__, yy_action_142)
     _ => Error
   }
 }
 
-// [56, trait_sig → PRIV TRAIT uident • loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
-// [59, trait_sig → PRIV TRAIT uident •, EOF / SEMI]
-// [153, loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) → •, LBRACE]
-// [154, loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) → • COLON separated_nonempty_list(PLUS,qualified_uident), LBRACE]
+// [64, type_sig → PUB pub_attr STRUCT type_decl_name_with_params LPAREN separated_list(COMMA,type_) • RPAREN, EOF / SEMI]
 
 ///|
-fn yy_state_280(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_558(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_106)
-    NT_loption_preceded_COLON_separated_nonempty_list_PLUS_qualified_uident___ =>
-      Shift(yy_state_281)
-    T_LBRACE =>
-      Reduce(
-        0,
-        NT_loption_preceded_COLON_separated_nonempty_list_PLUS_qualified_uident___,
-        yy_action_144,
-      )
-    T_EOF | T_SEMI => Reduce(3, NT_trait_sig, yy_action_58)
+    T_RPAREN => Shift(yy_state_559)
     _ => Error
   }
 }
 
-// [56, trait_sig → PRIV TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) • LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
+// [64, type_sig → PUB pub_attr STRUCT type_decl_name_with_params LPAREN separated_list(COMMA,type_) RPAREN •, EOF / SEMI]
 
 ///|
-fn yy_state_281(_lookahead : YYSymbol) -> YYDecision {
-  match _lookahead {
-    T_LBRACE => Shift(yy_state_282)
-    _ => Error
-  }
+fn yy_state_559(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(7, NT_type_sig, yy_action_40)
 }
 
-// [24, trait_method_sig → • lident LPAREN separated_list(COMMA,trait_method_parameter) RPAREN THIN_ARROW return_type boption(eq_underscore), SEMI / RBRACE]
-// [56, trait_sig → PRIV TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE • separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
-// [130, lident → • LIDENT, LPAREN]
-// [155, separated_nonempty_list(SEMI,trait_method_sig) → • trait_method_sig, RBRACE]
-// [156, separated_nonempty_list(SEMI,trait_method_sig) → • trait_method_sig SEMI separated_nonempty_list(SEMI,trait_method_sig), RBRACE]
+// [58, type_sig → PUB pub_attr STRUCT type_decl_name_with_params LBRACE • record_decl_body RBRACE, EOF / SEMI]
+// [124, record_decl_field → • boption(MUTABLE) LIDENT COLON type_, SEMI / RBRACE]
+// [125, record_decl_field → • nonempty_list(attribute) boption(MUTABLE) LIDENT COLON type_, SEMI / RBRACE]
+// [126, record_decl_constr → • ASYNC FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, RBRACE]
+// [127, record_decl_constr → • FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, RBRACE]
+// [128, record_decl_constr → • nonempty_list(attribute) ASYNC FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, RBRACE]
+// [129, record_decl_constr → • nonempty_list(attribute) FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, RBRACE]
+// [130, record_decl_body → •, RBRACE]
+// [131, record_decl_body → • record_decl_constr, RBRACE]
+// [132, record_decl_body → • record_decl_body_nonempty, RBRACE]
+// [133, record_decl_body_nonempty → • record_decl_field SEMI record_decl_constr, RBRACE]
+// [134, record_decl_body_nonempty → • record_decl_field, RBRACE]
+// [135, record_decl_body_nonempty → • record_decl_field SEMI record_decl_body_nonempty, RBRACE]
+// [219, boption(MUTABLE) → •, LIDENT]
+// [220, boption(MUTABLE) → • MUTABLE, LIDENT]
+// [229, nonempty_list(attribute) → • ATTRIBUTE, LIDENT / ASYNC / FN / MUTABLE]
+// [230, nonempty_list(attribute) → • ATTRIBUTE nonempty_list(attribute), LIDENT / ASYNC / FN / MUTABLE]
 
 ///|
-fn yy_state_282(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_560(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LIDENT => Shift(yy_state_26)
-    NT_trait_method_sig => Shift(yy_state_113)
-    NT_lident => Shift(yy_state_116)
-    NT_separated_nonempty_list_SEMI_trait_method_sig_ => Shift(yy_state_283)
+    T_ATTRIBUTE => Shift(yy_state_17)
+    T_MUTABLE => Shift(yy_state_184)
+    NT_record_decl_field => Shift(yy_state_212)
+    T_FN => Shift(yy_state_216)
+    T_ASYNC => Shift(yy_state_232)
+    NT_nonempty_list_attribute_ => Shift(yy_state_242)
+    NT_boption_MUTABLE_ => Shift(yy_state_266)
+    NT_record_decl_body_nonempty => Shift(yy_state_270)
+    NT_record_decl_constr => Shift(yy_state_271)
+    NT_record_decl_body => Shift(yy_state_561)
+    T_RBRACE => Reduce(0, NT_record_decl_body, yy_action_139)
+    T_LIDENT => Reduce(0, NT_boption_MUTABLE_, yy_action_157)
     _ => Error
   }
 }
 
-// [56, trait_sig → PRIV TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) • RBRACE, EOF / SEMI]
+// [58, type_sig → PUB pub_attr STRUCT type_decl_name_with_params LBRACE record_decl_body • RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_283(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_561(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RBRACE => Shift(yy_state_284)
+    T_RBRACE => Shift(yy_state_562)
     _ => Error
   }
 }
 
-// [56, trait_sig → PRIV TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE •, EOF / SEMI]
+// [58, type_sig → PUB pub_attr STRUCT type_decl_name_with_params LBRACE record_decl_body RBRACE •, EOF / SEMI]
 
 ///|
-fn yy_state_284(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(7, NT_trait_sig, yy_action_57)
+fn yy_state_562(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(7, NT_type_sig, yy_action_39)
 }
 
-// [50, type_sig → PRIV ENUM • type_decl_name_with_params LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
-// [83, type_decl_name_with_params → • uident optional_type_params_no_constraints, LBRACE]
-// [129, uident → • UIDENT, LBRACKET / LBRACE]
+// [46, type_sig → PUB pub_attr SUBERROR • uident option(type_), EOF / SEMI]
+// [52, type_sig → PUB pub_attr SUBERROR • uident LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [187, uident → • UIDENT, UIDENT / EOF / ASYNC / LPAREN / SEMI / UNDERSCORE / LBRACE / AMPER / PACKAGE_NAME]
 
 ///|
-fn yy_state_285(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_563(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_31)
-    NT_uident => Shift(yy_state_91)
-    NT_type_decl_name_with_params => Shift(yy_state_286)
+    T_UIDENT => Shift(yy_state_23)
+    NT_uident => Shift(yy_state_564)
     _ => Error
   }
 }
 
-// [50, type_sig → PRIV ENUM type_decl_name_with_params • LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
-
-///|
-fn yy_state_286(_lookahead : YYSymbol) -> YYDecision {
+// [46, type_sig → PUB pub_attr SUBERROR uident • option(type_), EOF / SEMI]
+// [52, type_sig → PUB pub_attr SUBERROR uident • LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [146, simple_type → • simple_type QUESTION, EOF / QUESTION / SEMI]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EOF / QUESTION / SEMI]
+// [148, simple_type → • LPAREN type_ RPAREN, EOF / QUESTION / SEMI]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, EOF / QUESTION / SEMI]
+// [150, simple_type → • AMPER qualified_uident_, EOF / QUESTION / SEMI]
+// [151, simple_type → • UNDERSCORE, EOF / QUESTION / SEMI]
+// [152, type_ → • simple_type, EOF / SEMI]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [185, qualified_uident_ → • UIDENT, EOF / QUESTION / SEMI / LBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EOF / QUESTION / SEMI / LBRACKET]
+// [201, option(type_) → •, EOF / SEMI]
+// [202, option(type_) → • type_, EOF / SEMI]
+
+///|
+fn yy_state_564(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACE => Shift(yy_state_287)
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_104)
+    NT_type_ => Shift(yy_state_276)
+    T_LBRACE => Shift(yy_state_565)
+    NT_option_type__ => Shift(yy_state_568)
+    T_EOF | T_SEMI => Reduce(0, NT_option_type__, yy_action_120)
     _ => Error
   }
 }
 
-// [50, type_sig → PRIV ENUM type_decl_name_with_params LBRACE • separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
-// [68, enum_constructor → • UIDENT option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) option(eq_tag), SEMI / RBRACE]
-// [69, enum_constructor → • nonempty_list(attribute) UIDENT option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) option(eq_tag), SEMI / RBRACE]
-// [145, separated_list(SEMI,enum_constructor) → •, RBRACE]
-// [146, separated_list(SEMI,enum_constructor) → • separated_nonempty_list(SEMI,enum_constructor), RBRACE]
-// [173, nonempty_list(attribute) → • ATTRIBUTE, UIDENT]
-// [174, nonempty_list(attribute) → • ATTRIBUTE nonempty_list(attribute), UIDENT]
-// [179, separated_nonempty_list(SEMI,enum_constructor) → • enum_constructor, RBRACE]
-// [180, separated_nonempty_list(SEMI,enum_constructor) → • enum_constructor SEMI separated_nonempty_list(SEMI,enum_constructor), RBRACE]
+// [52, type_sig → PUB pub_attr SUBERROR uident LBRACE • separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [120, enum_constructor → • UIDENT option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) option(eq_tag), SEMI / RBRACE]
+// [121, enum_constructor → • nonempty_list(attribute) UIDENT option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) option(eq_tag), SEMI / RBRACE]
+// [203, separated_list(SEMI,enum_constructor) → •, RBRACE]
+// [204, separated_list(SEMI,enum_constructor) → • separated_nonempty_list(SEMI,enum_constructor), RBRACE]
+// [229, nonempty_list(attribute) → • ATTRIBUTE, UIDENT]
+// [230, nonempty_list(attribute) → • ATTRIBUTE nonempty_list(attribute), UIDENT]
+// [233, separated_nonempty_list(SEMI,enum_constructor) → • enum_constructor, RBRACE]
+// [234, separated_nonempty_list(SEMI,enum_constructor) → • enum_constructor SEMI separated_nonempty_list(SEMI,enum_constructor), RBRACE]
 
 ///|
-fn yy_state_287(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_565(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_enum_constructor => Shift(yy_state_165)
-    T_ATTRIBUTE => Shift(yy_state_168)
-    NT_nonempty_list_attribute_ => Shift(yy_state_169)
-    T_UIDENT => Shift(yy_state_187)
-    NT_separated_nonempty_list_SEMI_enum_constructor_ => Shift(yy_state_190)
-    NT_separated_list_SEMI_enum_constructor_ => Shift(yy_state_288)
+    T_ATTRIBUTE => Shift(yy_state_17)
+    NT_enum_constructor => Shift(yy_state_178)
+    NT_nonempty_list_attribute_ => Shift(yy_state_181)
+    T_UIDENT => Shift(yy_state_199)
+    NT_separated_nonempty_list_SEMI_enum_constructor_ => Shift(yy_state_202)
+    NT_separated_list_SEMI_enum_constructor_ => Shift(yy_state_566)
     T_RBRACE =>
-      Reduce(0, NT_separated_list_SEMI_enum_constructor_, yy_action_111)
+      Reduce(0, NT_separated_list_SEMI_enum_constructor_, yy_action_161)
     _ => Error
   }
 }
 
-// [50, type_sig → PRIV ENUM type_decl_name_with_params LBRACE separated_list(SEMI,enum_constructor) • RBRACE, EOF / SEMI]
+// [52, type_sig → PUB pub_attr SUBERROR uident LBRACE separated_list(SEMI,enum_constructor) • RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_288(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_566(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RBRACE => Shift(yy_state_289)
+    T_RBRACE => Shift(yy_state_567)
     _ => Error
   }
 }
 
-// [50, type_sig → PRIV ENUM type_decl_name_with_params LBRACE separated_list(SEMI,enum_constructor) RBRACE •, EOF / SEMI]
+// [52, type_sig → PUB pub_attr SUBERROR uident LBRACE separated_list(SEMI,enum_constructor) RBRACE •, EOF / SEMI]
 
 ///|
-fn yy_state_289(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(6, NT_type_sig, yy_action_56)
+fn yy_state_567(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(7, NT_type_sig, yy_action_38)
 }
 
-// [44, type_sig → PRIV STRUCT • type_decl_name_with_params LBRACE separated_list(SEMI,record_decl_field) RBRACE, EOF / SEMI]
-// [47, type_sig → PRIV STRUCT • type_decl_name_with_params LPAREN separated_list(COMMA,type_) RPAREN, EOF / SEMI]
-// [83, type_decl_name_with_params → • uident optional_type_params_no_constraints, LPAREN / LBRACE]
-// [129, uident → • UIDENT, LPAREN / LBRACKET / LBRACE]
+// [46, type_sig → PUB pub_attr SUBERROR uident option(type_) •, EOF / SEMI]
 
 ///|
-fn yy_state_290(_lookahead : YYSymbol) -> YYDecision {
-  match _lookahead {
-    T_UIDENT => Shift(yy_state_31)
-    NT_uident => Shift(yy_state_91)
-    NT_type_decl_name_with_params => Shift(yy_state_291)
-    _ => Error
-  }
+fn yy_state_568(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(5, NT_type_sig, yy_action_37)
 }
 
-// [44, type_sig → PRIV STRUCT type_decl_name_with_params • LBRACE separated_list(SEMI,record_decl_field) RBRACE, EOF / SEMI]
-// [47, type_sig → PRIV STRUCT type_decl_name_with_params • LPAREN separated_list(COMMA,type_) RPAREN, EOF / SEMI]
+// [40, type_sig → PUB pub_attr TYPE • type_decl_name_with_params, EOF / SEMI]
+// [102, alias_sig → PUB pub_attr TYPE • type_decl_name_with_params EQUAL type_, EOF / SEMI]
+// [145, type_decl_name_with_params → • uident optional_type_params_no_constraints, EOF / EQUAL / SEMI]
+// [187, uident → • UIDENT, EOF / EQUAL / SEMI / LBRACKET]
 
 ///|
-fn yy_state_291(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_569(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LPAREN => Shift(yy_state_292)
-    T_LBRACE => Shift(yy_state_295)
+    T_UIDENT => Shift(yy_state_23)
+    NT_uident => Shift(yy_state_164)
+    NT_type_decl_name_with_params => Shift(yy_state_570)
     _ => Error
   }
 }
 
-// [47, type_sig → PRIV STRUCT type_decl_name_with_params LPAREN • separated_list(COMMA,type_) RPAREN, EOF / SEMI]
-// [84, simple_type → • simple_type QUESTION, RPAREN / COMMA / QUESTION]
-// [85, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, RPAREN / COMMA / QUESTION]
-// [86, simple_type → • LPAREN type_ RPAREN, RPAREN / COMMA / QUESTION]
-// [87, simple_type → • qualified_uident_ optional_type_arguments, RPAREN / COMMA / QUESTION]
-// [88, simple_type → • AMPER qualified_uident_, RPAREN / COMMA / QUESTION]
-// [89, simple_type → • UNDERSCORE, RPAREN / COMMA / QUESTION]
-// [90, type_ → • simple_type, RPAREN / COMMA]
-// [91, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [92, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [93, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [94, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [95, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [96, type_ → • LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [97, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [98, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [127, qualified_uident_ → • UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
-// [128, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
-// [149, separated_list(COMMA,type_) → •, RPAREN]
-// [150, separated_list(COMMA,type_) → • separated_nonempty_list(COMMA,type_), RPAREN]
-// [171, separated_nonempty_list(COMMA,type_) → • type_, RPAREN]
-// [172, separated_nonempty_list(COMMA,type_) → • type_ COMMA separated_nonempty_list(COMMA,type_), RPAREN]
+// [40, type_sig → PUB pub_attr TYPE type_decl_name_with_params •, EOF / SEMI]
+// [102, alias_sig → PUB pub_attr TYPE type_decl_name_with_params • EQUAL type_, EOF / SEMI]
 
 ///|
-fn yy_state_292(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_570(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_PACKAGE_NAME => Shift(yy_state_34)
-    T_UIDENT => Shift(yy_state_36)
-    T_ASYNC => Shift(yy_state_37)
-    T_UNDERSCORE => Shift(yy_state_43)
-    T_AMPER => Shift(yy_state_44)
-    NT_qualified_uident_ => Shift(yy_state_46)
-    NT_type_ => Shift(yy_state_48)
-    T_LPAREN => Shift(yy_state_51)
-    NT_simple_type => Shift(yy_state_73)
-    NT_separated_nonempty_list_COMMA_type__ => Shift(yy_state_196)
-    NT_separated_list_COMMA_type__ => Shift(yy_state_293)
-    T_RPAREN => Reduce(0, NT_separated_list_COMMA_type__, yy_action_92)
+    T_EQUAL => Shift(yy_state_571)
+    T_EOF | T_SEMI => Reduce(4, NT_type_sig, yy_action_36)
     _ => Error
   }
 }
 
-// [47, type_sig → PRIV STRUCT type_decl_name_with_params LPAREN separated_list(COMMA,type_) • RPAREN, EOF / SEMI]
-
-///|
-fn yy_state_293(_lookahead : YYSymbol) -> YYDecision {
+// [102, alias_sig → PUB pub_attr TYPE type_decl_name_with_params EQUAL • type_, EOF / SEMI]
+// [146, simple_type → • simple_type QUESTION, EOF / QUESTION / SEMI]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EOF / QUESTION / SEMI]
+// [148, simple_type → • LPAREN type_ RPAREN, EOF / QUESTION / SEMI]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, EOF / QUESTION / SEMI]
+// [150, simple_type → • AMPER qualified_uident_, EOF / QUESTION / SEMI]
+// [151, simple_type → • UNDERSCORE, EOF / QUESTION / SEMI]
+// [152, type_ → • simple_type, EOF / SEMI]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [185, qualified_uident_ → • UIDENT, EOF / QUESTION / SEMI / LBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EOF / QUESTION / SEMI / LBRACKET]
+
+///|
+fn yy_state_571(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RPAREN => Shift(yy_state_294)
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_104)
+    NT_type_ => Shift(yy_state_572)
     _ => Error
   }
 }
 
-// [47, type_sig → PRIV STRUCT type_decl_name_with_params LPAREN separated_list(COMMA,type_) RPAREN •, EOF / SEMI]
+// [102, alias_sig → PUB pub_attr TYPE type_decl_name_with_params EQUAL type_ •, EOF / SEMI]
 
 ///|
-fn yy_state_294(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(6, NT_type_sig, yy_action_55)
+fn yy_state_572(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(6, NT_alias_sig, yy_action_35)
 }
 
-// [44, type_sig → PRIV STRUCT type_decl_name_with_params LBRACE • separated_list(SEMI,record_decl_field) RBRACE, EOF / SEMI]
-// [72, record_decl_field → • boption(MUTABLE) LIDENT COLON type_, SEMI / RBRACE]
-// [73, record_decl_field → • nonempty_list(attribute) boption(MUTABLE) LIDENT COLON type_, SEMI / RBRACE]
-// [147, separated_list(SEMI,record_decl_field) → •, RBRACE]
-// [148, separated_list(SEMI,record_decl_field) → • separated_nonempty_list(SEMI,record_decl_field), RBRACE]
-// [163, boption(MUTABLE) → •, LIDENT]
-// [164, boption(MUTABLE) → • MUTABLE, LIDENT]
-// [173, nonempty_list(attribute) → • ATTRIBUTE, LIDENT / MUTABLE]
-// [174, nonempty_list(attribute) → • ATTRIBUTE nonempty_list(attribute), LIDENT / MUTABLE]
-// [181, separated_nonempty_list(SEMI,record_decl_field) → • record_decl_field, RBRACE]
-// [182, separated_nonempty_list(SEMI,record_decl_field) → • record_decl_field SEMI separated_nonempty_list(SEMI,record_decl_field), RBRACE]
+// [24, value_sig → PUB pub_attr LET • lident COLON type_, EOF / SEMI]
+// [188, lident → • LIDENT, COLON]
 
 ///|
-fn yy_state_295(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_573(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_ATTRIBUTE => Shift(yy_state_168)
-    T_MUTABLE => Shift(yy_state_172)
-    NT_record_decl_field => Shift(yy_state_200)
-    NT_nonempty_list_attribute_ => Shift(yy_state_203)
-    NT_boption_MUTABLE_ => Shift(yy_state_208)
-    NT_separated_nonempty_list_SEMI_record_decl_field_ => Shift(yy_state_212)
-    NT_separated_list_SEMI_record_decl_field_ => Shift(yy_state_296)
-    T_RBRACE =>
-      Reduce(0, NT_separated_list_SEMI_record_decl_field_, yy_action_89)
-    T_LIDENT => Reduce(0, NT_boption_MUTABLE_, yy_action_107)
+    T_LIDENT => Shift(yy_state_36)
+    NT_lident => Shift(yy_state_574)
     _ => Error
   }
 }
 
-// [44, type_sig → PRIV STRUCT type_decl_name_with_params LBRACE separated_list(SEMI,record_decl_field) • RBRACE, EOF / SEMI]
+// [24, value_sig → PUB pub_attr LET lident • COLON type_, EOF / SEMI]
 
 ///|
-fn yy_state_296(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_574(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_COLON => Shift(yy_state_575)
+    _ => Error
+  }
+}
+
+// [24, value_sig → PUB pub_attr LET lident COLON • type_, EOF / SEMI]
+// [146, simple_type → • simple_type QUESTION, EOF / QUESTION / SEMI]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EOF / QUESTION / SEMI]
+// [148, simple_type → • LPAREN type_ RPAREN, EOF / QUESTION / SEMI]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, EOF / QUESTION / SEMI]
+// [150, simple_type → • AMPER qualified_uident_, EOF / QUESTION / SEMI]
+// [151, simple_type → • UNDERSCORE, EOF / QUESTION / SEMI]
+// [152, type_ → • simple_type, EOF / SEMI]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [185, qualified_uident_ → • UIDENT, EOF / QUESTION / SEMI / LBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EOF / QUESTION / SEMI / LBRACKET]
+
+///|
+fn yy_state_575(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RBRACE => Shift(yy_state_297)
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_104)
+    NT_type_ => Shift(yy_state_576)
     _ => Error
   }
 }
 
-// [44, type_sig → PRIV STRUCT type_decl_name_with_params LBRACE separated_list(SEMI,record_decl_field) RBRACE •, EOF / SEMI]
+// [24, value_sig → PUB pub_attr LET lident COLON type_ •, EOF / SEMI]
 
 ///|
-fn yy_state_297(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(6, NT_type_sig, yy_action_54)
+fn yy_state_576(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(6, NT_value_sig, yy_action_34)
 }
 
-// [35, type_sig → PRIV SUBERROR • uident, EOF / SEMI]
-// [38, type_sig → PRIV SUBERROR • uident type_, EOF / SEMI]
-// [41, type_sig → PRIV SUBERROR • uident LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
-// [129, uident → • UIDENT, UIDENT / EOF / ASYNC / LPAREN / SEMI / UNDERSCORE / LBRACE / AMPER / PACKAGE_NAME]
+// [18, const_sig → PUB pub_attr CONST • uident COLON type_ EQUAL constant, EOF / SEMI]
+// [187, uident → • UIDENT, COLON]
 
 ///|
-fn yy_state_298(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_577(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_31)
-    NT_uident => Shift(yy_state_299)
+    T_UIDENT => Shift(yy_state_23)
+    NT_uident => Shift(yy_state_578)
     _ => Error
   }
 }
 
-// [35, type_sig → PRIV SUBERROR uident •, EOF / SEMI]
-// [38, type_sig → PRIV SUBERROR uident • type_, EOF / SEMI]
-// [41, type_sig → PRIV SUBERROR uident • LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
-// [84, simple_type → • simple_type QUESTION, EOF / QUESTION / SEMI]
-// [85, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EOF / QUESTION / SEMI]
-// [86, simple_type → • LPAREN type_ RPAREN, EOF / QUESTION / SEMI]
-// [87, simple_type → • qualified_uident_ optional_type_arguments, EOF / QUESTION / SEMI]
-// [88, simple_type → • AMPER qualified_uident_, EOF / QUESTION / SEMI]
-// [89, simple_type → • UNDERSCORE, EOF / QUESTION / SEMI]
-// [90, type_ → • simple_type, EOF / SEMI]
-// [91, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [92, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [93, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [94, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [95, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [96, type_ → • LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [97, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [98, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [127, qualified_uident_ → • UIDENT, EOF / QUESTION / SEMI / LBRACKET]
-// [128, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EOF / QUESTION / SEMI / LBRACKET]
+// [18, const_sig → PUB pub_attr CONST uident • COLON type_ EQUAL constant, EOF / SEMI]
 
 ///|
-fn yy_state_299(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_578(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_PACKAGE_NAME => Shift(yy_state_34)
-    T_UIDENT => Shift(yy_state_36)
-    T_ASYNC => Shift(yy_state_37)
-    T_UNDERSCORE => Shift(yy_state_43)
-    T_AMPER => Shift(yy_state_44)
-    NT_qualified_uident_ => Shift(yy_state_46)
-    T_LPAREN => Shift(yy_state_51)
-    NT_simple_type => Shift(yy_state_73)
-    T_LBRACE => Shift(yy_state_300)
-    NT_type_ => Shift(yy_state_303)
-    T_EOF | T_SEMI => Reduce(3, NT_type_sig, yy_action_53)
+    T_COLON => Shift(yy_state_579)
     _ => Error
   }
 }
 
-// [41, type_sig → PRIV SUBERROR uident LBRACE • separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
-// [68, enum_constructor → • UIDENT option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) option(eq_tag), SEMI / RBRACE]
-// [69, enum_constructor → • nonempty_list(attribute) UIDENT option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) option(eq_tag), SEMI / RBRACE]
-// [145, separated_list(SEMI,enum_constructor) → •, RBRACE]
-// [146, separated_list(SEMI,enum_constructor) → • separated_nonempty_list(SEMI,enum_constructor), RBRACE]
-// [173, nonempty_list(attribute) → • ATTRIBUTE, UIDENT]
-// [174, nonempty_list(attribute) → • ATTRIBUTE nonempty_list(attribute), UIDENT]
-// [179, separated_nonempty_list(SEMI,enum_constructor) → • enum_constructor, RBRACE]
-// [180, separated_nonempty_list(SEMI,enum_constructor) → • enum_constructor SEMI separated_nonempty_list(SEMI,enum_constructor), RBRACE]
-
-///|
-fn yy_state_300(_lookahead : YYSymbol) -> YYDecision {
+// [18, const_sig → PUB pub_attr CONST uident COLON • type_ EQUAL constant, EOF / SEMI]
+// [146, simple_type → • simple_type QUESTION, EQUAL / QUESTION]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EQUAL / QUESTION]
+// [148, simple_type → • LPAREN type_ RPAREN, EQUAL / QUESTION]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, EQUAL / QUESTION]
+// [150, simple_type → • AMPER qualified_uident_, EQUAL / QUESTION]
+// [151, simple_type → • UNDERSCORE, EQUAL / QUESTION]
+// [152, type_ → • simple_type, EQUAL]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EQUAL]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EQUAL]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EQUAL]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EQUAL]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EQUAL]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, EQUAL]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EQUAL]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EQUAL]
+// [185, qualified_uident_ → • UIDENT, EQUAL / QUESTION / LBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EQUAL / QUESTION / LBRACKET]
+
+///|
+fn yy_state_579(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_enum_constructor => Shift(yy_state_165)
-    T_ATTRIBUTE => Shift(yy_state_168)
-    NT_nonempty_list_attribute_ => Shift(yy_state_169)
-    T_UIDENT => Shift(yy_state_187)
-    NT_separated_nonempty_list_SEMI_enum_constructor_ => Shift(yy_state_190)
-    NT_separated_list_SEMI_enum_constructor_ => Shift(yy_state_301)
-    T_RBRACE =>
-      Reduce(0, NT_separated_list_SEMI_enum_constructor_, yy_action_111)
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_104)
+    NT_type_ => Shift(yy_state_580)
     _ => Error
   }
 }
 
-// [41, type_sig → PRIV SUBERROR uident LBRACE separated_list(SEMI,enum_constructor) • RBRACE, EOF / SEMI]
+// [18, const_sig → PUB pub_attr CONST uident COLON type_ • EQUAL constant, EOF / SEMI]
 
 ///|
-fn yy_state_301(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_580(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RBRACE => Shift(yy_state_302)
+    T_EQUAL => Shift(yy_state_581)
     _ => Error
   }
 }
 
-// [41, type_sig → PRIV SUBERROR uident LBRACE separated_list(SEMI,enum_constructor) RBRACE •, EOF / SEMI]
+// [18, const_sig → PUB pub_attr CONST uident COLON type_ EQUAL • constant, EOF / SEMI]
+// [171, constant → • TRUE, EOF / SEMI]
+// [172, constant → • FALSE, EOF / SEMI]
+// [173, constant → • BYTE, EOF / SEMI]
+// [174, constant → • BYTES, EOF / SEMI]
+// [175, constant → • CHAR, EOF / SEMI]
+// [176, constant → • INT, EOF / SEMI]
+// [177, constant → • FLOAT, EOF / SEMI]
+// [178, constant → • DOUBLE, EOF / SEMI]
+// [179, constant → • STRING, EOF / SEMI]
 
 ///|
-fn yy_state_302(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(6, NT_type_sig, yy_action_52)
+fn yy_state_581(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_STRING => Shift(yy_state_448)
+    T_DOUBLE => Shift(yy_state_449)
+    T_FLOAT => Shift(yy_state_450)
+    T_INT => Shift(yy_state_451)
+    T_CHAR => Shift(yy_state_452)
+    T_BYTES => Shift(yy_state_453)
+    T_BYTE => Shift(yy_state_454)
+    T_FALSE => Shift(yy_state_455)
+    T_TRUE => Shift(yy_state_456)
+    NT_constant => Shift(yy_state_582)
+    _ => Error
+  }
 }
 
-// [38, type_sig → PRIV SUBERROR uident type_ •, EOF / SEMI]
+// [18, const_sig → PUB pub_attr CONST uident COLON type_ EQUAL constant •, EOF / SEMI]
 
 ///|
-fn yy_state_303(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(4, NT_type_sig, yy_action_51)
+fn yy_state_582(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(8, NT_const_sig, yy_action_32)
 }
 
-// [29, type_sig → PRIV TYPE • type_decl_name_with_params, EOF / SEMI]
-// [32, type_sig → PRIV TYPE • type_decl_name_with_params type_, EOF / SEMI]
-// [83, type_decl_name_with_params → • uident optional_type_params_no_constraints, UIDENT / EOF / ASYNC / LPAREN / SEMI / UNDERSCORE / AMPER / PACKAGE_NAME]
-// [129, uident → • UIDENT, UIDENT / EOF / ASYNC / LPAREN / SEMI / LBRACKET / UNDERSCORE / AMPER / PACKAGE_NAME]
+// [17, const_sig → PRIV • CONST uident COLON type_ EQUAL constant, EOF / SEMI]
+// [23, value_sig → PRIV • LET lident COLON type_, EOF / SEMI]
+// [39, type_sig → PRIV • TYPE type_decl_name_with_params, EOF / SEMI]
+// [45, type_sig → PRIV • SUBERROR uident option(type_), EOF / SEMI]
+// [51, type_sig → PRIV • SUBERROR uident LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [57, type_sig → PRIV • STRUCT type_decl_name_with_params LBRACE record_decl_body RBRACE, EOF / SEMI]
+// [63, type_sig → PRIV • STRUCT type_decl_name_with_params LPAREN separated_list(COMMA,type_) RPAREN, EOF / SEMI]
+// [69, type_sig → PRIV • ENUM type_decl_name_with_params LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [75, impl_sig → PRIV • IMPL type_params_with_constraints qualified_uident FOR type_, EOF / SEMI]
+// [81, impl_sig → PRIV • IMPL qualified_uident FOR type_, EOF / SEMI]
+// [87, trait_sig → PRIV • TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
+// [93, trait_sig → PRIV • TRAIT uident, EOF / SEMI]
+// [101, alias_sig → PRIV • TYPE type_decl_name_with_params EQUAL type_, EOF / SEMI]
+// [109, alias_sig → PRIV • USING PACKAGE_NAME LBRACE TYPE uident using_binder RBRACE, EOF / SEMI]
+// [115, alias_sig → PRIV • USING PACKAGE_NAME LBRACE TRAIT uident using_binder RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_304(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_583(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_31)
-    NT_uident => Shift(yy_state_91)
-    NT_type_decl_name_with_params => Shift(yy_state_305)
+    T_USING => Shift(yy_state_584)
+    T_TRAIT => Shift(yy_state_595)
+    T_IMPL => Shift(yy_state_601)
+    T_ENUM => Shift(yy_state_609)
+    T_STRUCT => Shift(yy_state_614)
+    T_SUBERROR => Shift(yy_state_622)
+    T_TYPE => Shift(yy_state_628)
+    T_LET => Shift(yy_state_632)
+    T_CONST => Shift(yy_state_636)
     _ => Error
   }
 }
 
-// [29, type_sig → PRIV TYPE type_decl_name_with_params •, EOF / SEMI]
-// [32, type_sig → PRIV TYPE type_decl_name_with_params • type_, EOF / SEMI]
-// [84, simple_type → • simple_type QUESTION, EOF / QUESTION / SEMI]
-// [85, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EOF / QUESTION / SEMI]
-// [86, simple_type → • LPAREN type_ RPAREN, EOF / QUESTION / SEMI]
-// [87, simple_type → • qualified_uident_ optional_type_arguments, EOF / QUESTION / SEMI]
-// [88, simple_type → • AMPER qualified_uident_, EOF / QUESTION / SEMI]
-// [89, simple_type → • UNDERSCORE, EOF / QUESTION / SEMI]
-// [90, type_ → • simple_type, EOF / SEMI]
-// [91, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [92, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [93, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [94, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [95, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [96, type_ → • LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [97, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [98, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [127, qualified_uident_ → • UIDENT, EOF / QUESTION / SEMI / LBRACKET]
-// [128, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EOF / QUESTION / SEMI / LBRACKET]
+// [109, alias_sig → PRIV USING • PACKAGE_NAME LBRACE TYPE uident using_binder RBRACE, EOF / SEMI]
+// [115, alias_sig → PRIV USING • PACKAGE_NAME LBRACE TRAIT uident using_binder RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_305(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_584(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_PACKAGE_NAME => Shift(yy_state_34)
-    T_UIDENT => Shift(yy_state_36)
-    T_ASYNC => Shift(yy_state_37)
-    T_UNDERSCORE => Shift(yy_state_43)
-    T_AMPER => Shift(yy_state_44)
-    NT_qualified_uident_ => Shift(yy_state_46)
-    T_LPAREN => Shift(yy_state_51)
-    NT_simple_type => Shift(yy_state_73)
-    NT_type_ => Shift(yy_state_306)
-    T_EOF | T_SEMI => Reduce(3, NT_type_sig, yy_action_50)
+    T_PACKAGE_NAME => Shift(yy_state_585)
     _ => Error
   }
 }
 
-// [32, type_sig → PRIV TYPE type_decl_name_with_params type_ •, EOF / SEMI]
-
-///|
-fn yy_state_306(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(4, NT_type_sig, yy_action_49)
-}
-
-// [26, type_sig → PRIV EXTERN • TYPE type_decl_name_with_params, EOF / SEMI]
+// [109, alias_sig → PRIV USING PACKAGE_NAME • LBRACE TYPE uident using_binder RBRACE, EOF / SEMI]
+// [115, alias_sig → PRIV USING PACKAGE_NAME • LBRACE TRAIT uident using_binder RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_307(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_585(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_TYPE => Shift(yy_state_308)
+    T_LBRACE => Shift(yy_state_586)
     _ => Error
   }
 }
 
-// [26, type_sig → PRIV EXTERN TYPE • type_decl_name_with_params, EOF / SEMI]
-// [83, type_decl_name_with_params → • uident optional_type_params_no_constraints, EOF / SEMI]
-// [129, uident → • UIDENT, EOF / SEMI / LBRACKET]
+// [109, alias_sig → PRIV USING PACKAGE_NAME LBRACE • TYPE uident using_binder RBRACE, EOF / SEMI]
+// [115, alias_sig → PRIV USING PACKAGE_NAME LBRACE • TRAIT uident using_binder RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_308(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_586(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_31)
-    NT_uident => Shift(yy_state_91)
-    NT_type_decl_name_with_params => Shift(yy_state_309)
+    T_TRAIT => Shift(yy_state_587)
+    T_TYPE => Shift(yy_state_591)
     _ => Error
   }
 }
 
-// [26, type_sig → PRIV EXTERN TYPE type_decl_name_with_params •, EOF / SEMI]
+// [115, alias_sig → PRIV USING PACKAGE_NAME LBRACE TRAIT • uident using_binder RBRACE, EOF / SEMI]
+// [187, uident → • UIDENT, RBRACE / AS]
 
 ///|
-fn yy_state_309(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(4, NT_type_sig, yy_action_47)
+fn yy_state_587(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_UIDENT => Shift(yy_state_23)
+    NT_uident => Shift(yy_state_588)
+    _ => Error
+  }
 }
 
-// [25, type_sig → EXTERN • TYPE type_decl_name_with_params, EOF / SEMI]
+// [98, using_binder → •, RBRACE]
+// [99, using_binder → • AS uident, RBRACE]
+// [115, alias_sig → PRIV USING PACKAGE_NAME LBRACE TRAIT uident • using_binder RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_310(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_588(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_TYPE => Shift(yy_state_311)
+    T_AS => Shift(yy_state_27)
+    NT_using_binder => Shift(yy_state_589)
+    T_RBRACE => Reduce(0, NT_using_binder, yy_action_243)
     _ => Error
   }
 }
 
-// [25, type_sig → EXTERN TYPE • type_decl_name_with_params, EOF / SEMI]
-// [83, type_decl_name_with_params → • uident optional_type_params_no_constraints, EOF / SEMI]
-// [129, uident → • UIDENT, EOF / SEMI / LBRACKET]
+// [115, alias_sig → PRIV USING PACKAGE_NAME LBRACE TRAIT uident using_binder • RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_311(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_589(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_31)
-    NT_uident => Shift(yy_state_91)
-    NT_type_decl_name_with_params => Shift(yy_state_312)
+    T_RBRACE => Shift(yy_state_590)
     _ => Error
   }
 }
 
-// [25, type_sig → EXTERN TYPE type_decl_name_with_params •, EOF / SEMI]
+// [115, alias_sig → PRIV USING PACKAGE_NAME LBRACE TRAIT uident using_binder RBRACE •, EOF / SEMI]
 
 ///|
-fn yy_state_312(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_type_sig, yy_action_45)
+fn yy_state_590(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(8, NT_alias_sig, yy_action_31)
 }
 
-// [21, func_sig_no_attr → • FN loption(type_params_with_constraints) method_prefix lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [23, func_sig → nonempty_list(ATTRIBUTE) • func_sig_no_attr, EOF / SEMI]
+// [109, alias_sig → PRIV USING PACKAGE_NAME LBRACE TYPE • uident using_binder RBRACE, EOF / SEMI]
+// [187, uident → • UIDENT, RBRACE / AS]
 
 ///|
-fn yy_state_313(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_591(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_func_sig_no_attr => Shift(yy_state_314)
-    T_FN => Shift(yy_state_315)
+    T_UIDENT => Shift(yy_state_23)
+    NT_uident => Shift(yy_state_592)
     _ => Error
   }
 }
 
-// [23, func_sig → nonempty_list(ATTRIBUTE) func_sig_no_attr •, EOF / SEMI]
+// [98, using_binder → •, RBRACE]
+// [99, using_binder → • AS uident, RBRACE]
+// [109, alias_sig → PRIV USING PACKAGE_NAME LBRACE TYPE uident • using_binder RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_314(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_func_sig, yy_action_44)
+fn yy_state_592(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_AS => Shift(yy_state_27)
+    NT_using_binder => Shift(yy_state_593)
+    T_RBRACE => Reduce(0, NT_using_binder, yy_action_243)
+    _ => Error
+  }
 }
 
-// [21, func_sig_no_attr → FN • loption(type_params_with_constraints) method_prefix lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [76, type_params_with_constraints → • LBRACKET separated_list(COMMA,type_param_with_constraints) RBRACKET, LIDENT / UIDENT]
-// [135, loption(type_params_with_constraints) → •, LIDENT / UIDENT]
-// [136, loption(type_params_with_constraints) → • type_params_with_constraints, LIDENT / UIDENT]
+// [109, alias_sig → PRIV USING PACKAGE_NAME LBRACE TYPE uident using_binder • RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_315(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_593(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACKET => Shift(yy_state_138)
-    NT_type_params_with_constraints => Shift(yy_state_316)
-    NT_loption_type_params_with_constraints_ => Shift(yy_state_317)
-    T_LIDENT | T_UIDENT =>
-      Reduce(0, NT_loption_type_params_with_constraints_, yy_action_43)
+    T_RBRACE => Shift(yy_state_594)
     _ => Error
   }
 }
 
-// [136, loption(type_params_with_constraints) → type_params_with_constraints •, LIDENT / UIDENT]
+// [109, alias_sig → PRIV USING PACKAGE_NAME LBRACE TYPE uident using_binder RBRACE •, EOF / SEMI]
 
 ///|
-fn yy_state_316(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_loption_type_params_with_constraints_, yy_action_42)
+fn yy_state_594(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(8, NT_alias_sig, yy_action_30)
 }
 
-// [19, method_prefix → •, LIDENT]
-// [20, method_prefix → • uident COLONCOLON, LIDENT]
-// [21, func_sig_no_attr → FN loption(type_params_with_constraints) • method_prefix lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [129, uident → • UIDENT, COLONCOLON]
+// [87, trait_sig → PRIV TRAIT • uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
+// [93, trait_sig → PRIV TRAIT • uident, EOF / SEMI]
+// [187, uident → • UIDENT, EOF / COLON / SEMI / LBRACE]
 
 ///|
-fn yy_state_317(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_595(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_31)
-    NT_method_prefix => Shift(yy_state_318)
-    NT_uident => Shift(yy_state_341)
-    T_LIDENT => Reduce(0, NT_method_prefix, yy_action_41)
+    T_UIDENT => Shift(yy_state_23)
+    NT_uident => Shift(yy_state_596)
     _ => Error
   }
 }
 
-// [21, func_sig_no_attr → FN loption(type_params_with_constraints) method_prefix • lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [130, lident → • LIDENT, LPAREN]
+// [87, trait_sig → PRIV TRAIT uident • loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
+// [93, trait_sig → PRIV TRAIT uident •, EOF / SEMI]
+// [209, loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) → •, LBRACE]
+// [210, loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) → • COLON separated_nonempty_list(PLUS,qualified_uident), LBRACE]
 
 ///|
-fn yy_state_318(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_596(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LIDENT => Shift(yy_state_26)
-    NT_lident => Shift(yy_state_319)
+    T_COLON => Shift(yy_state_40)
+    NT_loption_preceded_COLON_separated_nonempty_list_PLUS_qualified_uident___ =>
+      Shift(yy_state_597)
+    T_LBRACE =>
+      Reduce(
+        0,
+        NT_loption_preceded_COLON_separated_nonempty_list_PLUS_qualified_uident___,
+        yy_action_236,
+      )
+    T_EOF | T_SEMI => Reduce(3, NT_trait_sig, yy_action_29)
     _ => Error
   }
 }
 
-// [21, func_sig_no_attr → FN loption(type_params_with_constraints) method_prefix lident • LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, EOF / SEMI]
-
-///|
-fn yy_state_319(_lookahead : YYSymbol) -> YYDecision {
-  match _lookahead {
-    T_LPAREN => Shift(yy_state_320)
-    _ => Error
-  }
-}
-
-// [21, func_sig_no_attr → FN loption(type_params_with_constraints) method_prefix lident LPAREN • separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [84, simple_type → • simple_type QUESTION, RPAREN / COMMA / QUESTION]
-// [85, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, RPAREN / COMMA / QUESTION]
-// [86, simple_type → • LPAREN type_ RPAREN, RPAREN / COMMA / QUESTION]
-// [87, simple_type → • qualified_uident_ optional_type_arguments, RPAREN / COMMA / QUESTION]
-// [88, simple_type → • AMPER qualified_uident_, RPAREN / COMMA / QUESTION]
-// [89, simple_type → • UNDERSCORE, RPAREN / COMMA / QUESTION]
-// [90, type_ → • simple_type, RPAREN / COMMA]
-// [91, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [92, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [93, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [94, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [95, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [96, type_ → • LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [97, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [98, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [106, parameter → • type_, RPAREN / COMMA]
-// [107, parameter → • post_label COLON type_, RPAREN / COMMA]
-// [108, parameter → • post_label COLON type_ EQUAL DOTDOT, RPAREN / COMMA]
-// [109, parameter → • post_label COLON type_ EQUAL UNDERSCORE, RPAREN / COMMA]
-// [110, parameter → • label QUESTION COLON type_, RPAREN / COMMA]
-// [127, qualified_uident_ → • UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
-// [128, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
-// [131, label → • LIDENT, QUESTION]
-// [132, post_label → • POST_LABEL, COLON]
-// [137, separated_list(COMMA,parameter) → •, RPAREN]
-// [138, separated_list(COMMA,parameter) → • separated_nonempty_list(COMMA,parameter), RPAREN]
-// [175, separated_nonempty_list(COMMA,parameter) → • parameter, RPAREN]
-// [176, separated_nonempty_list(COMMA,parameter) → • parameter COMMA separated_nonempty_list(COMMA,parameter), RPAREN]
+// [87, trait_sig → PRIV TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) • LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_320(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_597(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_PACKAGE_NAME => Shift(yy_state_34)
-    T_UIDENT => Shift(yy_state_36)
-    T_ASYNC => Shift(yy_state_37)
-    T_UNDERSCORE => Shift(yy_state_43)
-    T_AMPER => Shift(yy_state_44)
-    NT_qualified_uident_ => Shift(yy_state_46)
-    T_LPAREN => Shift(yy_state_51)
-    NT_simple_type => Shift(yy_state_73)
-    T_POST_LABEL => Shift(yy_state_121)
-    NT_parameter => Shift(yy_state_321)
-    T_LIDENT => Shift(yy_state_324)
-    NT_label => Shift(yy_state_325)
-    NT_post_label => Shift(yy_state_329)
-    NT_type_ => Shift(yy_state_335)
-    NT_separated_nonempty_list_COMMA_parameter_ => Shift(yy_state_336)
-    NT_separated_list_COMMA_parameter_ => Shift(yy_state_337)
-    T_RPAREN => Reduce(0, NT_separated_list_COMMA_parameter_, yy_action_40)
+    T_LBRACE => Shift(yy_state_598)
     _ => Error
   }
 }
 
-// [175, separated_nonempty_list(COMMA,parameter) → parameter •, RPAREN]
-// [176, separated_nonempty_list(COMMA,parameter) → parameter • COMMA separated_nonempty_list(COMMA,parameter), RPAREN]
-
-///|
-fn yy_state_321(_lookahead : YYSymbol) -> YYDecision {
-  match _lookahead {
-    T_COMMA => Shift(yy_state_322)
-    T_RPAREN =>
-      Reduce(1, NT_separated_nonempty_list_COMMA_parameter_, yy_action_39)
-    _ => Error
-  }
-}
-
-// [84, simple_type → • simple_type QUESTION, RPAREN / COMMA / QUESTION]
-// [85, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, RPAREN / COMMA / QUESTION]
-// [86, simple_type → • LPAREN type_ RPAREN, RPAREN / COMMA / QUESTION]
-// [87, simple_type → • qualified_uident_ optional_type_arguments, RPAREN / COMMA / QUESTION]
-// [88, simple_type → • AMPER qualified_uident_, RPAREN / COMMA / QUESTION]
-// [89, simple_type → • UNDERSCORE, RPAREN / COMMA / QUESTION]
-// [90, type_ → • simple_type, RPAREN / COMMA]
-// [91, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [92, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [93, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [94, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [95, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [96, type_ → • LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [97, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [98, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [106, parameter → • type_, RPAREN / COMMA]
-// [107, parameter → • post_label COLON type_, RPAREN / COMMA]
-// [108, parameter → • post_label COLON type_ EQUAL DOTDOT, RPAREN / COMMA]
-// [109, parameter → • post_label COLON type_ EQUAL UNDERSCORE, RPAREN / COMMA]
-// [110, parameter → • label QUESTION COLON type_, RPAREN / COMMA]
-// [127, qualified_uident_ → • UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
-// [128, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
-// [131, label → • LIDENT, QUESTION]
-// [132, post_label → • POST_LABEL, COLON]
-// [175, separated_nonempty_list(COMMA,parameter) → • parameter, RPAREN]
-// [176, separated_nonempty_list(COMMA,parameter) → • parameter COMMA separated_nonempty_list(COMMA,parameter), RPAREN]
-// [176, separated_nonempty_list(COMMA,parameter) → parameter COMMA • separated_nonempty_list(COMMA,parameter), RPAREN]
+// [36, trait_method_sig → • lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type boption(eq_underscore), SEMI / RBRACE]
+// [37, trait_method_sig → • nonempty_list(attribute) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type boption(eq_underscore), SEMI / RBRACE]
+// [87, trait_sig → PRIV TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE • separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
+// [188, lident → • LIDENT, LPAREN]
+// [211, separated_nonempty_list(SEMI,trait_method_sig) → • trait_method_sig, RBRACE]
+// [212, separated_nonempty_list(SEMI,trait_method_sig) → • trait_method_sig SEMI separated_nonempty_list(SEMI,trait_method_sig), RBRACE]
+// [229, nonempty_list(attribute) → • ATTRIBUTE, LIDENT]
+// [230, nonempty_list(attribute) → • ATTRIBUTE nonempty_list(attribute), LIDENT]
 
 ///|
-fn yy_state_322(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_598(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_PACKAGE_NAME => Shift(yy_state_34)
-    T_UIDENT => Shift(yy_state_36)
-    T_ASYNC => Shift(yy_state_37)
-    T_UNDERSCORE => Shift(yy_state_43)
-    T_AMPER => Shift(yy_state_44)
-    NT_qualified_uident_ => Shift(yy_state_46)
-    T_LPAREN => Shift(yy_state_51)
-    NT_simple_type => Shift(yy_state_73)
-    T_POST_LABEL => Shift(yy_state_121)
-    NT_parameter => Shift(yy_state_321)
-    NT_separated_nonempty_list_COMMA_parameter_ => Shift(yy_state_323)
-    T_LIDENT => Shift(yy_state_324)
-    NT_label => Shift(yy_state_325)
-    NT_post_label => Shift(yy_state_329)
-    NT_type_ => Shift(yy_state_335)
+    T_ATTRIBUTE => Shift(yy_state_17)
+    T_LIDENT => Shift(yy_state_36)
+    NT_trait_method_sig => Shift(yy_state_50)
+    NT_nonempty_list_attribute_ => Shift(yy_state_53)
+    NT_lident => Shift(yy_state_132)
+    NT_separated_nonempty_list_SEMI_trait_method_sig_ => Shift(yy_state_599)
     _ => Error
   }
 }
 
-// [176, separated_nonempty_list(COMMA,parameter) → parameter COMMA separated_nonempty_list(COMMA,parameter) •, RPAREN]
+// [87, trait_sig → PRIV TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) • RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_323(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(
-    3,
-    NT_separated_nonempty_list_COMMA_parameter_,
-    yy_action_38,
-  )
+fn yy_state_599(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_RBRACE => Shift(yy_state_600)
+    _ => Error
+  }
 }
 
-// [131, label → LIDENT •, QUESTION]
+// [87, trait_sig → PRIV TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE •, EOF / SEMI]
 
 ///|
-fn yy_state_324(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_label, yy_action_37)
+fn yy_state_600(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(7, NT_trait_sig, yy_action_28)
 }
 
-// [110, parameter → label • QUESTION COLON type_, RPAREN / COMMA]
+// [75, impl_sig → PRIV IMPL • type_params_with_constraints qualified_uident FOR type_, EOF / SEMI]
+// [81, impl_sig → PRIV IMPL • qualified_uident FOR type_, EOF / SEMI]
+// [138, type_params_with_constraints → • LBRACKET separated_list(COMMA,type_param_with_constraints) RBRACKET, UIDENT / PACKAGE_NAME]
+// [183, qualified_uident → • UIDENT, FOR]
+// [184, qualified_uident → • PACKAGE_NAME DOT_UIDENT, FOR]
 
 ///|
-fn yy_state_325(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_601(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_QUESTION => Shift(yy_state_326)
+    T_PACKAGE_NAME => Shift(yy_state_45)
+    T_UIDENT => Shift(yy_state_47)
+    T_LBRACKET => Shift(yy_state_142)
+    NT_qualified_uident => Shift(yy_state_602)
+    NT_type_params_with_constraints => Shift(yy_state_605)
     _ => Error
   }
 }
 
-// [110, parameter → label QUESTION • COLON type_, RPAREN / COMMA]
+// [81, impl_sig → PRIV IMPL qualified_uident • FOR type_, EOF / SEMI]
 
 ///|
-fn yy_state_326(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_602(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_327)
+    T_FOR => Shift(yy_state_603)
     _ => Error
   }
 }
 
-// [84, simple_type → • simple_type QUESTION, RPAREN / COMMA / QUESTION]
-// [85, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, RPAREN / COMMA / QUESTION]
-// [86, simple_type → • LPAREN type_ RPAREN, RPAREN / COMMA / QUESTION]
-// [87, simple_type → • qualified_uident_ optional_type_arguments, RPAREN / COMMA / QUESTION]
-// [88, simple_type → • AMPER qualified_uident_, RPAREN / COMMA / QUESTION]
-// [89, simple_type → • UNDERSCORE, RPAREN / COMMA / QUESTION]
-// [90, type_ → • simple_type, RPAREN / COMMA]
-// [91, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [92, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [93, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [94, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [95, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [96, type_ → • LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [97, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [98, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
-// [110, parameter → label QUESTION COLON • type_, RPAREN / COMMA]
-// [127, qualified_uident_ → • UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
-// [128, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
-
-///|
-fn yy_state_327(_lookahead : YYSymbol) -> YYDecision {
+// [81, impl_sig → PRIV IMPL qualified_uident FOR • type_, EOF / SEMI]
+// [146, simple_type → • simple_type QUESTION, EOF / QUESTION / SEMI]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EOF / QUESTION / SEMI]
+// [148, simple_type → • LPAREN type_ RPAREN, EOF / QUESTION / SEMI]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, EOF / QUESTION / SEMI]
+// [150, simple_type → • AMPER qualified_uident_, EOF / QUESTION / SEMI]
+// [151, simple_type → • UNDERSCORE, EOF / QUESTION / SEMI]
+// [152, type_ → • simple_type, EOF / SEMI]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [185, qualified_uident_ → • UIDENT, EOF / QUESTION / SEMI / LBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EOF / QUESTION / SEMI / LBRACKET]
+
+///|
+fn yy_state_603(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_PACKAGE_NAME => Shift(yy_state_34)
-    T_UIDENT => Shift(yy_state_36)
-    T_ASYNC => Shift(yy_state_37)
-    T_UNDERSCORE => Shift(yy_state_43)
-    T_AMPER => Shift(yy_state_44)
-    NT_qualified_uident_ => Shift(yy_state_46)
-    T_LPAREN => Shift(yy_state_51)
-    NT_simple_type => Shift(yy_state_73)
-    NT_type_ => Shift(yy_state_328)
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_104)
+    NT_type_ => Shift(yy_state_604)
     _ => Error
   }
 }
 
-// [110, parameter → label QUESTION COLON type_ •, RPAREN / COMMA]
+// [81, impl_sig → PRIV IMPL qualified_uident FOR type_ •, EOF / SEMI]
 
 ///|
-fn yy_state_328(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(4, NT_parameter, yy_action_36)
+fn yy_state_604(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(5, NT_impl_sig, yy_action_27)
 }
 
-// [107, parameter → post_label • COLON type_, RPAREN / COMMA]
-// [108, parameter → post_label • COLON type_ EQUAL DOTDOT, RPAREN / COMMA]
-// [109, parameter → post_label • COLON type_ EQUAL UNDERSCORE, RPAREN / COMMA]
+// [75, impl_sig → PRIV IMPL type_params_with_constraints • qualified_uident FOR type_, EOF / SEMI]
+// [183, qualified_uident → • UIDENT, FOR]
+// [184, qualified_uident → • PACKAGE_NAME DOT_UIDENT, FOR]
 
 ///|
-fn yy_state_329(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_605(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_330)
+    T_PACKAGE_NAME => Shift(yy_state_45)
+    T_UIDENT => Shift(yy_state_47)
+    NT_qualified_uident => Shift(yy_state_606)
     _ => Error
   }
 }
 
-// [84, simple_type → • simple_type QUESTION, EQUAL / RPAREN / COMMA / QUESTION]
-// [85, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EQUAL / RPAREN / COMMA / QUESTION]
-// [86, simple_type → • LPAREN type_ RPAREN, EQUAL / RPAREN / COMMA / QUESTION]
-// [87, simple_type → • qualified_uident_ optional_type_arguments, EQUAL / RPAREN / COMMA / QUESTION]
-// [88, simple_type → • AMPER qualified_uident_, EQUAL / RPAREN / COMMA / QUESTION]
-// [89, simple_type → • UNDERSCORE, EQUAL / RPAREN / COMMA / QUESTION]
-// [90, type_ → • simple_type, EQUAL / RPAREN / COMMA]
-// [91, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EQUAL / RPAREN / COMMA]
-// [92, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EQUAL / RPAREN / COMMA]
-// [93, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EQUAL / RPAREN / COMMA]
-// [94, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EQUAL / RPAREN / COMMA]
-// [95, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EQUAL / RPAREN / COMMA]
-// [96, type_ → • LPAREN RPAREN THIN_ARROW return_type, EQUAL / RPAREN / COMMA]
-// [97, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EQUAL / RPAREN / COMMA]
-// [98, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EQUAL / RPAREN / COMMA]
-// [107, parameter → post_label COLON • type_, RPAREN / COMMA]
-// [108, parameter → post_label COLON • type_ EQUAL DOTDOT, RPAREN / COMMA]
-// [109, parameter → post_label COLON • type_ EQUAL UNDERSCORE, RPAREN / COMMA]
-// [127, qualified_uident_ → • UIDENT, EQUAL / RPAREN / COMMA / QUESTION / LBRACKET]
-// [128, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EQUAL / RPAREN / COMMA / QUESTION / LBRACKET]
+// [75, impl_sig → PRIV IMPL type_params_with_constraints qualified_uident • FOR type_, EOF / SEMI]
 
 ///|
-fn yy_state_330(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_606(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_PACKAGE_NAME => Shift(yy_state_34)
-    T_UIDENT => Shift(yy_state_36)
-    T_ASYNC => Shift(yy_state_37)
-    T_UNDERSCORE => Shift(yy_state_43)
-    T_AMPER => Shift(yy_state_44)
-    NT_qualified_uident_ => Shift(yy_state_46)
-    T_LPAREN => Shift(yy_state_51)
-    NT_simple_type => Shift(yy_state_73)
-    NT_type_ => Shift(yy_state_331)
+    T_FOR => Shift(yy_state_607)
     _ => Error
   }
 }
 
-// [107, parameter → post_label COLON type_ •, RPAREN / COMMA]
-// [108, parameter → post_label COLON type_ • EQUAL DOTDOT, RPAREN / COMMA]
-// [109, parameter → post_label COLON type_ • EQUAL UNDERSCORE, RPAREN / COMMA]
-
-///|
-fn yy_state_331(_lookahead : YYSymbol) -> YYDecision {
+// [75, impl_sig → PRIV IMPL type_params_with_constraints qualified_uident FOR • type_, EOF / SEMI]
+// [146, simple_type → • simple_type QUESTION, EOF / QUESTION / SEMI]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EOF / QUESTION / SEMI]
+// [148, simple_type → • LPAREN type_ RPAREN, EOF / QUESTION / SEMI]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, EOF / QUESTION / SEMI]
+// [150, simple_type → • AMPER qualified_uident_, EOF / QUESTION / SEMI]
+// [151, simple_type → • UNDERSCORE, EOF / QUESTION / SEMI]
+// [152, type_ → • simple_type, EOF / SEMI]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [185, qualified_uident_ → • UIDENT, EOF / QUESTION / SEMI / LBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EOF / QUESTION / SEMI / LBRACKET]
+
+///|
+fn yy_state_607(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_EQUAL => Shift(yy_state_332)
-    T_RPAREN | T_COMMA => Reduce(3, NT_parameter, yy_action_35)
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_104)
+    NT_type_ => Shift(yy_state_608)
     _ => Error
   }
 }
 
-// [108, parameter → post_label COLON type_ EQUAL • DOTDOT, RPAREN / COMMA]
-// [109, parameter → post_label COLON type_ EQUAL • UNDERSCORE, RPAREN / COMMA]
+// [75, impl_sig → PRIV IMPL type_params_with_constraints qualified_uident FOR type_ •, EOF / SEMI]
 
 ///|
-fn yy_state_332(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_608(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(6, NT_impl_sig, yy_action_26)
+}
+
+// [69, type_sig → PRIV ENUM • type_decl_name_with_params LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [145, type_decl_name_with_params → • uident optional_type_params_no_constraints, LBRACE]
+// [187, uident → • UIDENT, LBRACKET / LBRACE]
+
+///|
+fn yy_state_609(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UNDERSCORE => Shift(yy_state_333)
-    T_DOTDOT => Shift(yy_state_334)
+    T_UIDENT => Shift(yy_state_23)
+    NT_uident => Shift(yy_state_164)
+    NT_type_decl_name_with_params => Shift(yy_state_610)
     _ => Error
   }
 }
 
-// [109, parameter → post_label COLON type_ EQUAL UNDERSCORE •, RPAREN / COMMA]
+// [69, type_sig → PRIV ENUM type_decl_name_with_params • LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_333(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(5, NT_parameter, yy_action_34)
+fn yy_state_610(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_LBRACE => Shift(yy_state_611)
+    _ => Error
+  }
 }
 
-// [108, parameter → post_label COLON type_ EQUAL DOTDOT •, RPAREN / COMMA]
+// [69, type_sig → PRIV ENUM type_decl_name_with_params LBRACE • separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [120, enum_constructor → • UIDENT option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) option(eq_tag), SEMI / RBRACE]
+// [121, enum_constructor → • nonempty_list(attribute) UIDENT option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) option(eq_tag), SEMI / RBRACE]
+// [203, separated_list(SEMI,enum_constructor) → •, RBRACE]
+// [204, separated_list(SEMI,enum_constructor) → • separated_nonempty_list(SEMI,enum_constructor), RBRACE]
+// [229, nonempty_list(attribute) → • ATTRIBUTE, UIDENT]
+// [230, nonempty_list(attribute) → • ATTRIBUTE nonempty_list(attribute), UIDENT]
+// [233, separated_nonempty_list(SEMI,enum_constructor) → • enum_constructor, RBRACE]
+// [234, separated_nonempty_list(SEMI,enum_constructor) → • enum_constructor SEMI separated_nonempty_list(SEMI,enum_constructor), RBRACE]
 
 ///|
-fn yy_state_334(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(5, NT_parameter, yy_action_33)
+fn yy_state_611(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_ATTRIBUTE => Shift(yy_state_17)
+    NT_enum_constructor => Shift(yy_state_178)
+    NT_nonempty_list_attribute_ => Shift(yy_state_181)
+    T_UIDENT => Shift(yy_state_199)
+    NT_separated_nonempty_list_SEMI_enum_constructor_ => Shift(yy_state_202)
+    NT_separated_list_SEMI_enum_constructor_ => Shift(yy_state_612)
+    T_RBRACE =>
+      Reduce(0, NT_separated_list_SEMI_enum_constructor_, yy_action_161)
+    _ => Error
+  }
 }
 
-// [106, parameter → type_ •, RPAREN / COMMA]
+// [69, type_sig → PRIV ENUM type_decl_name_with_params LBRACE separated_list(SEMI,enum_constructor) • RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_335(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_parameter, yy_action_32)
+fn yy_state_612(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_RBRACE => Shift(yy_state_613)
+    _ => Error
+  }
 }
 
-// [138, separated_list(COMMA,parameter) → separated_nonempty_list(COMMA,parameter) •, RPAREN]
+// [69, type_sig → PRIV ENUM type_decl_name_with_params LBRACE separated_list(SEMI,enum_constructor) RBRACE •, EOF / SEMI]
 
 ///|
-fn yy_state_336(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_separated_list_COMMA_parameter_, yy_action_31)
+fn yy_state_613(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(6, NT_type_sig, yy_action_25)
 }
 
-// [21, func_sig_no_attr → FN loption(type_params_with_constraints) method_prefix lident LPAREN separated_list(COMMA,parameter) • RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [57, type_sig → PRIV STRUCT • type_decl_name_with_params LBRACE record_decl_body RBRACE, EOF / SEMI]
+// [63, type_sig → PRIV STRUCT • type_decl_name_with_params LPAREN separated_list(COMMA,type_) RPAREN, EOF / SEMI]
+// [145, type_decl_name_with_params → • uident optional_type_params_no_constraints, LPAREN / LBRACE]
+// [187, uident → • UIDENT, LPAREN / LBRACKET / LBRACE]
 
 ///|
-fn yy_state_337(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_614(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RPAREN => Shift(yy_state_338)
+    T_UIDENT => Shift(yy_state_23)
+    NT_uident => Shift(yy_state_164)
+    NT_type_decl_name_with_params => Shift(yy_state_615)
     _ => Error
   }
 }
 
-// [21, func_sig_no_attr → FN loption(type_params_with_constraints) method_prefix lident LPAREN separated_list(COMMA,parameter) RPAREN • THIN_ARROW return_type, EOF / SEMI]
+// [57, type_sig → PRIV STRUCT type_decl_name_with_params • LBRACE record_decl_body RBRACE, EOF / SEMI]
+// [63, type_sig → PRIV STRUCT type_decl_name_with_params • LPAREN separated_list(COMMA,type_) RPAREN, EOF / SEMI]
 
 ///|
-fn yy_state_338(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_615(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_LPAREN => Shift(yy_state_616)
+    T_LBRACE => Shift(yy_state_619)
+    _ => Error
+  }
+}
+
+// [63, type_sig → PRIV STRUCT type_decl_name_with_params LPAREN • separated_list(COMMA,type_) RPAREN, EOF / SEMI]
+// [146, simple_type → • simple_type QUESTION, RPAREN / COMMA / QUESTION]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, RPAREN / COMMA / QUESTION]
+// [148, simple_type → • LPAREN type_ RPAREN, RPAREN / COMMA / QUESTION]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, RPAREN / COMMA / QUESTION]
+// [150, simple_type → • AMPER qualified_uident_, RPAREN / COMMA / QUESTION]
+// [151, simple_type → • UNDERSCORE, RPAREN / COMMA / QUESTION]
+// [152, type_ → • simple_type, RPAREN / COMMA]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, RPAREN / COMMA]
+// [185, qualified_uident_ → • UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, RPAREN / COMMA / QUESTION / LBRACKET]
+// [205, separated_list(COMMA,type_) → •, RPAREN]
+// [206, separated_list(COMMA,type_) → • separated_nonempty_list(COMMA,type_), RPAREN]
+// [227, separated_nonempty_list(COMMA,type_) → • type_, RPAREN]
+// [228, separated_nonempty_list(COMMA,type_) → • type_ COMMA separated_nonempty_list(COMMA,type_), RPAREN]
+
+///|
+fn yy_state_616(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_THIN_ARROW => Shift(yy_state_339)
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    NT_type_ => Shift(yy_state_79)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_104)
+    NT_separated_nonempty_list_COMMA_type__ => Shift(yy_state_208)
+    NT_separated_list_COMMA_type__ => Shift(yy_state_617)
+    T_RPAREN => Reduce(0, NT_separated_list_COMMA_type__, yy_action_142)
     _ => Error
   }
 }
 
-// [21, func_sig_no_attr → FN loption(type_params_with_constraints) method_prefix lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW • return_type, EOF / SEMI]
-// [84, simple_type → • simple_type QUESTION, EOF / RAISE / QUESTION / SEMI]
-// [85, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EOF / RAISE / QUESTION / SEMI]
-// [86, simple_type → • LPAREN type_ RPAREN, EOF / RAISE / QUESTION / SEMI]
-// [87, simple_type → • qualified_uident_ optional_type_arguments, EOF / RAISE / QUESTION / SEMI]
-// [88, simple_type → • AMPER qualified_uident_, EOF / RAISE / QUESTION / SEMI]
-// [89, simple_type → • UNDERSCORE, EOF / RAISE / QUESTION / SEMI]
-// [90, type_ → • simple_type, EOF / SEMI]
-// [91, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [92, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [93, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [94, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [95, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [96, type_ → • LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [97, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [98, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [99, return_type → • type_, EOF / SEMI]
-// [100, return_type → • simple_type RAISE, EOF / SEMI]
-// [101, return_type → • simple_type RAISE error_type, EOF / SEMI]
-// [102, return_type → • simple_type RAISE QUESTION, EOF / SEMI]
-// [127, qualified_uident_ → • UIDENT, EOF / RAISE / QUESTION / SEMI / LBRACKET]
-// [128, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EOF / RAISE / QUESTION / SEMI / LBRACKET]
+// [63, type_sig → PRIV STRUCT type_decl_name_with_params LPAREN separated_list(COMMA,type_) • RPAREN, EOF / SEMI]
 
 ///|
-fn yy_state_339(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_617(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_PACKAGE_NAME => Shift(yy_state_34)
-    T_UIDENT => Shift(yy_state_36)
-    T_ASYNC => Shift(yy_state_37)
-    NT_type_ => Shift(yy_state_41)
-    T_UNDERSCORE => Shift(yy_state_43)
-    T_AMPER => Shift(yy_state_44)
-    NT_qualified_uident_ => Shift(yy_state_46)
-    T_LPAREN => Shift(yy_state_51)
-    NT_simple_type => Shift(yy_state_55)
-    NT_return_type => Shift(yy_state_340)
+    T_RPAREN => Shift(yy_state_618)
     _ => Error
   }
 }
 
-// [21, func_sig_no_attr → FN loption(type_params_with_constraints) method_prefix lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type •, EOF / SEMI]
+// [63, type_sig → PRIV STRUCT type_decl_name_with_params LPAREN separated_list(COMMA,type_) RPAREN •, EOF / SEMI]
 
 ///|
-fn yy_state_340(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(9, NT_func_sig_no_attr, yy_action_29)
+fn yy_state_618(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(6, NT_type_sig, yy_action_24)
 }
 
-// [20, method_prefix → uident • COLONCOLON, LIDENT]
+// [57, type_sig → PRIV STRUCT type_decl_name_with_params LBRACE • record_decl_body RBRACE, EOF / SEMI]
+// [124, record_decl_field → • boption(MUTABLE) LIDENT COLON type_, SEMI / RBRACE]
+// [125, record_decl_field → • nonempty_list(attribute) boption(MUTABLE) LIDENT COLON type_, SEMI / RBRACE]
+// [126, record_decl_constr → • ASYNC FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, RBRACE]
+// [127, record_decl_constr → • FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, RBRACE]
+// [128, record_decl_constr → • nonempty_list(attribute) ASYNC FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, RBRACE]
+// [129, record_decl_constr → • nonempty_list(attribute) FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, RBRACE]
+// [130, record_decl_body → •, RBRACE]
+// [131, record_decl_body → • record_decl_constr, RBRACE]
+// [132, record_decl_body → • record_decl_body_nonempty, RBRACE]
+// [133, record_decl_body_nonempty → • record_decl_field SEMI record_decl_constr, RBRACE]
+// [134, record_decl_body_nonempty → • record_decl_field, RBRACE]
+// [135, record_decl_body_nonempty → • record_decl_field SEMI record_decl_body_nonempty, RBRACE]
+// [219, boption(MUTABLE) → •, LIDENT]
+// [220, boption(MUTABLE) → • MUTABLE, LIDENT]
+// [229, nonempty_list(attribute) → • ATTRIBUTE, LIDENT / ASYNC / FN / MUTABLE]
+// [230, nonempty_list(attribute) → • ATTRIBUTE nonempty_list(attribute), LIDENT / ASYNC / FN / MUTABLE]
 
 ///|
-fn yy_state_341(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_619(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLONCOLON => Shift(yy_state_342)
+    T_ATTRIBUTE => Shift(yy_state_17)
+    T_MUTABLE => Shift(yy_state_184)
+    NT_record_decl_field => Shift(yy_state_212)
+    T_FN => Shift(yy_state_216)
+    T_ASYNC => Shift(yy_state_232)
+    NT_nonempty_list_attribute_ => Shift(yy_state_242)
+    NT_boption_MUTABLE_ => Shift(yy_state_266)
+    NT_record_decl_body_nonempty => Shift(yy_state_270)
+    NT_record_decl_constr => Shift(yy_state_271)
+    NT_record_decl_body => Shift(yy_state_620)
+    T_RBRACE => Reduce(0, NT_record_decl_body, yy_action_139)
+    T_LIDENT => Reduce(0, NT_boption_MUTABLE_, yy_action_157)
     _ => Error
   }
 }
 
-// [20, method_prefix → uident COLONCOLON •, LIDENT]
+// [57, type_sig → PRIV STRUCT type_decl_name_with_params LBRACE record_decl_body • RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_342(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_method_prefix, yy_action_28)
+fn yy_state_620(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_RBRACE => Shift(yy_state_621)
+    _ => Error
+  }
 }
 
-// [22, func_sig → func_sig_no_attr •, EOF / SEMI]
+// [57, type_sig → PRIV STRUCT type_decl_name_with_params LBRACE record_decl_body RBRACE •, EOF / SEMI]
 
 ///|
-fn yy_state_343(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_func_sig, yy_action_27)
+fn yy_state_621(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(6, NT_type_sig, yy_action_23)
 }
 
-// [18, value_sig → nonempty_list(attribute) • LET lident COLON type_, EOF / SEMI]
+// [45, type_sig → PRIV SUBERROR • uident option(type_), EOF / SEMI]
+// [51, type_sig → PRIV SUBERROR • uident LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [187, uident → • UIDENT, UIDENT / EOF / ASYNC / LPAREN / SEMI / UNDERSCORE / LBRACE / AMPER / PACKAGE_NAME]
 
 ///|
-fn yy_state_344(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_622(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LET => Shift(yy_state_345)
+    T_UIDENT => Shift(yy_state_23)
+    NT_uident => Shift(yy_state_623)
     _ => Error
   }
 }
 
-// [18, value_sig → nonempty_list(attribute) LET • lident COLON type_, EOF / SEMI]
-// [130, lident → • LIDENT, COLON]
-
-///|
-fn yy_state_345(_lookahead : YYSymbol) -> YYDecision {
+// [45, type_sig → PRIV SUBERROR uident • option(type_), EOF / SEMI]
+// [51, type_sig → PRIV SUBERROR uident • LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [146, simple_type → • simple_type QUESTION, EOF / QUESTION / SEMI]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EOF / QUESTION / SEMI]
+// [148, simple_type → • LPAREN type_ RPAREN, EOF / QUESTION / SEMI]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, EOF / QUESTION / SEMI]
+// [150, simple_type → • AMPER qualified_uident_, EOF / QUESTION / SEMI]
+// [151, simple_type → • UNDERSCORE, EOF / QUESTION / SEMI]
+// [152, type_ → • simple_type, EOF / SEMI]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [185, qualified_uident_ → • UIDENT, EOF / QUESTION / SEMI / LBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EOF / QUESTION / SEMI / LBRACKET]
+// [201, option(type_) → •, EOF / SEMI]
+// [202, option(type_) → • type_, EOF / SEMI]
+
+///|
+fn yy_state_623(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LIDENT => Shift(yy_state_26)
-    NT_lident => Shift(yy_state_346)
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_104)
+    NT_type_ => Shift(yy_state_276)
+    T_LBRACE => Shift(yy_state_624)
+    NT_option_type__ => Shift(yy_state_627)
+    T_EOF | T_SEMI => Reduce(0, NT_option_type__, yy_action_120)
     _ => Error
   }
 }
 
-// [18, value_sig → nonempty_list(attribute) LET lident • COLON type_, EOF / SEMI]
+// [51, type_sig → PRIV SUBERROR uident LBRACE • separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [120, enum_constructor → • UIDENT option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) option(eq_tag), SEMI / RBRACE]
+// [121, enum_constructor → • nonempty_list(attribute) UIDENT option(delimited(LPAREN,separated_nonempty_list(COMMA,constructor_param),RPAREN)) option(eq_tag), SEMI / RBRACE]
+// [203, separated_list(SEMI,enum_constructor) → •, RBRACE]
+// [204, separated_list(SEMI,enum_constructor) → • separated_nonempty_list(SEMI,enum_constructor), RBRACE]
+// [229, nonempty_list(attribute) → • ATTRIBUTE, UIDENT]
+// [230, nonempty_list(attribute) → • ATTRIBUTE nonempty_list(attribute), UIDENT]
+// [233, separated_nonempty_list(SEMI,enum_constructor) → • enum_constructor, RBRACE]
+// [234, separated_nonempty_list(SEMI,enum_constructor) → • enum_constructor SEMI separated_nonempty_list(SEMI,enum_constructor), RBRACE]
 
 ///|
-fn yy_state_346(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_624(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_347)
+    T_ATTRIBUTE => Shift(yy_state_17)
+    NT_enum_constructor => Shift(yy_state_178)
+    NT_nonempty_list_attribute_ => Shift(yy_state_181)
+    T_UIDENT => Shift(yy_state_199)
+    NT_separated_nonempty_list_SEMI_enum_constructor_ => Shift(yy_state_202)
+    NT_separated_list_SEMI_enum_constructor_ => Shift(yy_state_625)
+    T_RBRACE =>
+      Reduce(0, NT_separated_list_SEMI_enum_constructor_, yy_action_161)
     _ => Error
   }
 }
 
-// [18, value_sig → nonempty_list(attribute) LET lident COLON • type_, EOF / SEMI]
-// [84, simple_type → • simple_type QUESTION, EOF / QUESTION / SEMI]
-// [85, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EOF / QUESTION / SEMI]
-// [86, simple_type → • LPAREN type_ RPAREN, EOF / QUESTION / SEMI]
-// [87, simple_type → • qualified_uident_ optional_type_arguments, EOF / QUESTION / SEMI]
-// [88, simple_type → • AMPER qualified_uident_, EOF / QUESTION / SEMI]
-// [89, simple_type → • UNDERSCORE, EOF / QUESTION / SEMI]
-// [90, type_ → • simple_type, EOF / SEMI]
-// [91, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [92, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [93, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [94, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [95, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [96, type_ → • LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [97, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [98, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [127, qualified_uident_ → • UIDENT, EOF / QUESTION / SEMI / LBRACKET]
-// [128, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EOF / QUESTION / SEMI / LBRACKET]
+// [51, type_sig → PRIV SUBERROR uident LBRACE separated_list(SEMI,enum_constructor) • RBRACE, EOF / SEMI]
 
 ///|
-fn yy_state_347(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_625(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_PACKAGE_NAME => Shift(yy_state_34)
-    T_UIDENT => Shift(yy_state_36)
-    T_ASYNC => Shift(yy_state_37)
-    T_UNDERSCORE => Shift(yy_state_43)
-    T_AMPER => Shift(yy_state_44)
-    NT_qualified_uident_ => Shift(yy_state_46)
-    T_LPAREN => Shift(yy_state_51)
-    NT_simple_type => Shift(yy_state_73)
-    NT_type_ => Shift(yy_state_348)
+    T_RBRACE => Shift(yy_state_626)
     _ => Error
   }
 }
 
-// [18, value_sig → nonempty_list(attribute) LET lident COLON type_ •, EOF / SEMI]
+// [51, type_sig → PRIV SUBERROR uident LBRACE separated_list(SEMI,enum_constructor) RBRACE •, EOF / SEMI]
 
 ///|
-fn yy_state_348(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(5, NT_value_sig, yy_action_25)
+fn yy_state_626(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(6, NT_type_sig, yy_action_22)
 }
 
-// [17, value_sig → LET • lident COLON type_, EOF / SEMI]
-// [130, lident → • LIDENT, COLON]
+// [45, type_sig → PRIV SUBERROR uident option(type_) •, EOF / SEMI]
 
 ///|
-fn yy_state_349(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_627(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(4, NT_type_sig, yy_action_21)
+}
+
+// [39, type_sig → PRIV TYPE • type_decl_name_with_params, EOF / SEMI]
+// [101, alias_sig → PRIV TYPE • type_decl_name_with_params EQUAL type_, EOF / SEMI]
+// [145, type_decl_name_with_params → • uident optional_type_params_no_constraints, EOF / EQUAL / SEMI]
+// [187, uident → • UIDENT, EOF / EQUAL / SEMI / LBRACKET]
+
+///|
+fn yy_state_628(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LIDENT => Shift(yy_state_26)
-    NT_lident => Shift(yy_state_350)
+    T_UIDENT => Shift(yy_state_23)
+    NT_uident => Shift(yy_state_164)
+    NT_type_decl_name_with_params => Shift(yy_state_629)
     _ => Error
   }
 }
 
-// [17, value_sig → LET lident • COLON type_, EOF / SEMI]
+// [39, type_sig → PRIV TYPE type_decl_name_with_params •, EOF / SEMI]
+// [101, alias_sig → PRIV TYPE type_decl_name_with_params • EQUAL type_, EOF / SEMI]
 
 ///|
-fn yy_state_350(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_629(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_351)
+    T_EQUAL => Shift(yy_state_630)
+    T_EOF | T_SEMI => Reduce(3, NT_type_sig, yy_action_20)
     _ => Error
   }
 }
 
-// [17, value_sig → LET lident COLON • type_, EOF / SEMI]
-// [84, simple_type → • simple_type QUESTION, EOF / QUESTION / SEMI]
-// [85, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EOF / QUESTION / SEMI]
-// [86, simple_type → • LPAREN type_ RPAREN, EOF / QUESTION / SEMI]
-// [87, simple_type → • qualified_uident_ optional_type_arguments, EOF / QUESTION / SEMI]
-// [88, simple_type → • AMPER qualified_uident_, EOF / QUESTION / SEMI]
-// [89, simple_type → • UNDERSCORE, EOF / QUESTION / SEMI]
-// [90, type_ → • simple_type, EOF / SEMI]
-// [91, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [92, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [93, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [94, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [95, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [96, type_ → • LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [97, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [98, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [127, qualified_uident_ → • UIDENT, EOF / QUESTION / SEMI / LBRACKET]
-// [128, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EOF / QUESTION / SEMI / LBRACKET]
-
-///|
-fn yy_state_351(_lookahead : YYSymbol) -> YYDecision {
+// [101, alias_sig → PRIV TYPE type_decl_name_with_params EQUAL • type_, EOF / SEMI]
+// [146, simple_type → • simple_type QUESTION, EOF / QUESTION / SEMI]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EOF / QUESTION / SEMI]
+// [148, simple_type → • LPAREN type_ RPAREN, EOF / QUESTION / SEMI]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, EOF / QUESTION / SEMI]
+// [150, simple_type → • AMPER qualified_uident_, EOF / QUESTION / SEMI]
+// [151, simple_type → • UNDERSCORE, EOF / QUESTION / SEMI]
+// [152, type_ → • simple_type, EOF / SEMI]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [185, qualified_uident_ → • UIDENT, EOF / QUESTION / SEMI / LBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EOF / QUESTION / SEMI / LBRACKET]
+
+///|
+fn yy_state_630(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_PACKAGE_NAME => Shift(yy_state_34)
-    T_UIDENT => Shift(yy_state_36)
-    T_ASYNC => Shift(yy_state_37)
-    T_UNDERSCORE => Shift(yy_state_43)
-    T_AMPER => Shift(yy_state_44)
-    NT_qualified_uident_ => Shift(yy_state_46)
-    T_LPAREN => Shift(yy_state_51)
-    NT_simple_type => Shift(yy_state_73)
-    NT_type_ => Shift(yy_state_352)
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_104)
+    NT_type_ => Shift(yy_state_631)
     _ => Error
   }
 }
 
-// [17, value_sig → LET lident COLON type_ •, EOF / SEMI]
+// [101, alias_sig → PRIV TYPE type_decl_name_with_params EQUAL type_ •, EOF / SEMI]
 
 ///|
-fn yy_state_352(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(4, NT_value_sig, yy_action_23)
+fn yy_state_631(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(5, NT_alias_sig, yy_action_19)
 }
 
-// [16, const_sig → CONST • uident COLON type_ EQUAL constant, EOF / SEMI]
-// [129, uident → • UIDENT, COLON]
+// [23, value_sig → PRIV LET • lident COLON type_, EOF / SEMI]
+// [188, lident → • LIDENT, COLON]
 
 ///|
-fn yy_state_353(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_632(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_31)
-    NT_uident => Shift(yy_state_354)
+    T_LIDENT => Shift(yy_state_36)
+    NT_lident => Shift(yy_state_633)
     _ => Error
   }
 }
 
-// [16, const_sig → CONST uident • COLON type_ EQUAL constant, EOF / SEMI]
+// [23, value_sig → PRIV LET lident • COLON type_, EOF / SEMI]
 
 ///|
-fn yy_state_354(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_633(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_355)
+    T_COLON => Shift(yy_state_634)
     _ => Error
   }
 }
 
-// [16, const_sig → CONST uident COLON • type_ EQUAL constant, EOF / SEMI]
-// [84, simple_type → • simple_type QUESTION, EQUAL / QUESTION]
-// [85, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EQUAL / QUESTION]
-// [86, simple_type → • LPAREN type_ RPAREN, EQUAL / QUESTION]
-// [87, simple_type → • qualified_uident_ optional_type_arguments, EQUAL / QUESTION]
-// [88, simple_type → • AMPER qualified_uident_, EQUAL / QUESTION]
-// [89, simple_type → • UNDERSCORE, EQUAL / QUESTION]
-// [90, type_ → • simple_type, EQUAL]
-// [91, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EQUAL]
-// [92, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EQUAL]
-// [93, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EQUAL]
-// [94, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EQUAL]
-// [95, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EQUAL]
-// [96, type_ → • LPAREN RPAREN THIN_ARROW return_type, EQUAL]
-// [97, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EQUAL]
-// [98, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EQUAL]
-// [127, qualified_uident_ → • UIDENT, EQUAL / QUESTION / LBRACKET]
-// [128, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EQUAL / QUESTION / LBRACKET]
-
-///|
-fn yy_state_355(_lookahead : YYSymbol) -> YYDecision {
+// [23, value_sig → PRIV LET lident COLON • type_, EOF / SEMI]
+// [146, simple_type → • simple_type QUESTION, EOF / QUESTION / SEMI]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EOF / QUESTION / SEMI]
+// [148, simple_type → • LPAREN type_ RPAREN, EOF / QUESTION / SEMI]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, EOF / QUESTION / SEMI]
+// [150, simple_type → • AMPER qualified_uident_, EOF / QUESTION / SEMI]
+// [151, simple_type → • UNDERSCORE, EOF / QUESTION / SEMI]
+// [152, type_ → • simple_type, EOF / SEMI]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [185, qualified_uident_ → • UIDENT, EOF / QUESTION / SEMI / LBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EOF / QUESTION / SEMI / LBRACKET]
+
+///|
+fn yy_state_634(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_PACKAGE_NAME => Shift(yy_state_34)
-    T_UIDENT => Shift(yy_state_36)
-    T_ASYNC => Shift(yy_state_37)
-    T_UNDERSCORE => Shift(yy_state_43)
-    T_AMPER => Shift(yy_state_44)
-    NT_qualified_uident_ => Shift(yy_state_46)
-    T_LPAREN => Shift(yy_state_51)
-    NT_simple_type => Shift(yy_state_73)
-    NT_type_ => Shift(yy_state_356)
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_104)
+    NT_type_ => Shift(yy_state_635)
     _ => Error
   }
 }
 
-// [16, const_sig → CONST uident COLON type_ • EQUAL constant, EOF / SEMI]
+// [23, value_sig → PRIV LET lident COLON type_ •, EOF / SEMI]
 
 ///|
-fn yy_state_356(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_635(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(5, NT_value_sig, yy_action_18)
+}
+
+// [17, const_sig → PRIV CONST • uident COLON type_ EQUAL constant, EOF / SEMI]
+// [187, uident → • UIDENT, COLON]
+
+///|
+fn yy_state_636(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_EQUAL => Shift(yy_state_357)
+    T_UIDENT => Shift(yy_state_23)
+    NT_uident => Shift(yy_state_637)
     _ => Error
   }
 }
 
-// [16, const_sig → CONST uident COLON type_ EQUAL • constant, EOF / SEMI]
-// [113, constant → • TRUE, EOF / SEMI]
-// [114, constant → • FALSE, EOF / SEMI]
-// [115, constant → • BYTE, EOF / SEMI]
-// [116, constant → • BYTES, EOF / SEMI]
-// [117, constant → • CHAR, EOF / SEMI]
-// [118, constant → • INT, EOF / SEMI]
-// [119, constant → • FLOAT, EOF / SEMI]
-// [120, constant → • DOUBLE, EOF / SEMI]
-// [121, constant → • STRING, EOF / SEMI]
+// [17, const_sig → PRIV CONST uident • COLON type_ EQUAL constant, EOF / SEMI]
 
 ///|
-fn yy_state_357(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_637(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_STRING => Shift(yy_state_358)
-    T_DOUBLE => Shift(yy_state_359)
-    T_FLOAT => Shift(yy_state_360)
-    T_INT => Shift(yy_state_361)
-    T_CHAR => Shift(yy_state_362)
-    T_BYTES => Shift(yy_state_363)
-    T_BYTE => Shift(yy_state_364)
-    T_FALSE => Shift(yy_state_365)
-    T_TRUE => Shift(yy_state_366)
-    NT_constant => Shift(yy_state_367)
+    T_COLON => Shift(yy_state_638)
     _ => Error
   }
 }
 
-// [121, constant → STRING •, EOF / SEMI]
-
-///|
-fn yy_state_358(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_constant, yy_action_22)
+// [17, const_sig → PRIV CONST uident COLON • type_ EQUAL constant, EOF / SEMI]
+// [146, simple_type → • simple_type QUESTION, EQUAL / QUESTION]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EQUAL / QUESTION]
+// [148, simple_type → • LPAREN type_ RPAREN, EQUAL / QUESTION]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, EQUAL / QUESTION]
+// [150, simple_type → • AMPER qualified_uident_, EQUAL / QUESTION]
+// [151, simple_type → • UNDERSCORE, EQUAL / QUESTION]
+// [152, type_ → • simple_type, EQUAL]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EQUAL]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EQUAL]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EQUAL]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EQUAL]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EQUAL]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, EQUAL]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EQUAL]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EQUAL]
+// [185, qualified_uident_ → • UIDENT, EQUAL / QUESTION / LBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EQUAL / QUESTION / LBRACKET]
+
+///|
+fn yy_state_638(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_104)
+    NT_type_ => Shift(yy_state_639)
+    _ => Error
+  }
 }
 
-// [120, constant → DOUBLE •, EOF / SEMI]
+// [17, const_sig → PRIV CONST uident COLON type_ • EQUAL constant, EOF / SEMI]
 
 ///|
-fn yy_state_359(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_constant, yy_action_21)
+fn yy_state_639(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_EQUAL => Shift(yy_state_640)
+    _ => Error
+  }
 }
 
-// [119, constant → FLOAT •, EOF / SEMI]
+// [17, const_sig → PRIV CONST uident COLON type_ EQUAL • constant, EOF / SEMI]
+// [171, constant → • TRUE, EOF / SEMI]
+// [172, constant → • FALSE, EOF / SEMI]
+// [173, constant → • BYTE, EOF / SEMI]
+// [174, constant → • BYTES, EOF / SEMI]
+// [175, constant → • CHAR, EOF / SEMI]
+// [176, constant → • INT, EOF / SEMI]
+// [177, constant → • FLOAT, EOF / SEMI]
+// [178, constant → • DOUBLE, EOF / SEMI]
+// [179, constant → • STRING, EOF / SEMI]
 
 ///|
-fn yy_state_360(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_constant, yy_action_20)
+fn yy_state_640(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_STRING => Shift(yy_state_448)
+    T_DOUBLE => Shift(yy_state_449)
+    T_FLOAT => Shift(yy_state_450)
+    T_INT => Shift(yy_state_451)
+    T_CHAR => Shift(yy_state_452)
+    T_BYTES => Shift(yy_state_453)
+    T_BYTE => Shift(yy_state_454)
+    T_FALSE => Shift(yy_state_455)
+    T_TRUE => Shift(yy_state_456)
+    NT_constant => Shift(yy_state_641)
+    _ => Error
+  }
 }
 
-// [118, constant → INT •, EOF / SEMI]
+// [17, const_sig → PRIV CONST uident COLON type_ EQUAL constant •, EOF / SEMI]
 
 ///|
-fn yy_state_361(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_constant, yy_action_19)
+fn yy_state_641(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(7, NT_const_sig, yy_action_16)
 }
 
-// [117, constant → CHAR •, EOF / SEMI]
+// [16, const_sig → CONST • uident COLON type_ EQUAL constant, EOF / SEMI]
+// [187, uident → • UIDENT, COLON]
 
 ///|
-fn yy_state_362(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_constant, yy_action_18)
+fn yy_state_642(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_UIDENT => Shift(yy_state_23)
+    NT_uident => Shift(yy_state_643)
+    _ => Error
+  }
 }
 
-// [116, constant → BYTES •, EOF / SEMI]
+// [16, const_sig → CONST uident • COLON type_ EQUAL constant, EOF / SEMI]
 
 ///|
-fn yy_state_363(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_constant, yy_action_17)
+fn yy_state_643(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_COLON => Shift(yy_state_644)
+    _ => Error
+  }
 }
 
-// [115, constant → BYTE •, EOF / SEMI]
-
-///|
-fn yy_state_364(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_constant, yy_action_16)
+// [16, const_sig → CONST uident COLON • type_ EQUAL constant, EOF / SEMI]
+// [146, simple_type → • simple_type QUESTION, EQUAL / QUESTION]
+// [147, simple_type → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN, EQUAL / QUESTION]
+// [148, simple_type → • LPAREN type_ RPAREN, EQUAL / QUESTION]
+// [149, simple_type → • qualified_uident_ optional_type_arguments, EQUAL / QUESTION]
+// [150, simple_type → • AMPER qualified_uident_, EQUAL / QUESTION]
+// [151, simple_type → • UNDERSCORE, EQUAL / QUESTION]
+// [152, type_ → • simple_type, EQUAL]
+// [153, type_ → • ASYNC LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EQUAL]
+// [154, type_ → • ASYNC LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EQUAL]
+// [155, type_ → • LPAREN type_ COMMA RPAREN THIN_ARROW return_type, EQUAL]
+// [156, type_ → • LPAREN type_ COMMA separated_nonempty_list(COMMA,type_) RPAREN THIN_ARROW return_type, EQUAL]
+// [157, type_ → • ASYNC LPAREN RPAREN THIN_ARROW return_type, EQUAL]
+// [158, type_ → • LPAREN RPAREN THIN_ARROW return_type, EQUAL]
+// [159, type_ → • ASYNC LPAREN type_ RPAREN THIN_ARROW return_type, EQUAL]
+// [160, type_ → • LPAREN type_ RPAREN THIN_ARROW return_type, EQUAL]
+// [185, qualified_uident_ → • UIDENT, EQUAL / QUESTION / LBRACKET]
+// [186, qualified_uident_ → • PACKAGE_NAME DOT_UIDENT, EQUAL / QUESTION / LBRACKET]
+
+///|
+fn yy_state_644(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_PACKAGE_NAME => Shift(yy_state_61)
+    T_UIDENT => Shift(yy_state_63)
+    T_ASYNC => Shift(yy_state_68)
+    T_UNDERSCORE => Shift(yy_state_74)
+    T_AMPER => Shift(yy_state_75)
+    NT_qualified_uident_ => Shift(yy_state_77)
+    T_LPAREN => Shift(yy_state_82)
+    NT_simple_type => Shift(yy_state_104)
+    NT_type_ => Shift(yy_state_645)
+    _ => Error
+  }
 }
 
-// [114, constant → FALSE •, EOF / SEMI]
+// [16, const_sig → CONST uident COLON type_ • EQUAL constant, EOF / SEMI]
 
 ///|
-fn yy_state_365(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_constant, yy_action_15)
+fn yy_state_645(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_EQUAL => Shift(yy_state_646)
+    _ => Error
+  }
 }
 
-// [113, constant → TRUE •, EOF / SEMI]
-
-///|
-fn yy_state_366(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_constant, yy_action_14)
+// [16, const_sig → CONST uident COLON type_ EQUAL • constant, EOF / SEMI]
+// [171, constant → • TRUE, EOF / SEMI]
+// [172, constant → • FALSE, EOF / SEMI]
+// [173, constant → • BYTE, EOF / SEMI]
+// [174, constant → • BYTES, EOF / SEMI]
+// [175, constant → • CHAR, EOF / SEMI]
+// [176, constant → • INT, EOF / SEMI]
+// [177, constant → • FLOAT, EOF / SEMI]
+// [178, constant → • DOUBLE, EOF / SEMI]
+// [179, constant → • STRING, EOF / SEMI]
+
+///|
+fn yy_state_646(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_STRING => Shift(yy_state_448)
+    T_DOUBLE => Shift(yy_state_449)
+    T_FLOAT => Shift(yy_state_450)
+    T_INT => Shift(yy_state_451)
+    T_CHAR => Shift(yy_state_452)
+    T_BYTES => Shift(yy_state_453)
+    T_BYTE => Shift(yy_state_454)
+    T_FALSE => Shift(yy_state_455)
+    T_TRUE => Shift(yy_state_456)
+    NT_constant => Shift(yy_state_647)
+    _ => Error
+  }
 }
 
 // [16, const_sig → CONST uident COLON type_ EQUAL constant •, EOF / SEMI]
 
 ///|
-fn yy_state_367(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_647(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(6, NT_const_sig, yy_action_13)
 }
 
 // [15, sig_ → value_sig •, EOF / SEMI]
 
 ///|
-fn yy_state_368(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_648(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(1, NT_sig_, yy_action_12)
 }
 
 // [14, sig_ → const_sig •, EOF / SEMI]
 
 ///|
-fn yy_state_369(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_649(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(1, NT_sig_, yy_action_11)
 }
 
 // [13, sig_ → impl_sig •, EOF / SEMI]
 
 ///|
-fn yy_state_370(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_650(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(1, NT_sig_, yy_action_10)
 }
 
 // [12, sig_ → trait_sig •, EOF / SEMI]
 
 ///|
-fn yy_state_371(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_651(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(1, NT_sig_, yy_action_9)
 }
 
 // [11, sig_ → alias_sig •, EOF / SEMI]
 
 ///|
-fn yy_state_372(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_652(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(1, NT_sig_, yy_action_8)
 }
 
 // [10, sig_ → type_sig •, EOF / SEMI]
 
 ///|
-fn yy_state_373(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_653(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(1, NT_sig_, yy_action_7)
 }
 
 // [9, sig_ → func_sig •, EOF / SEMI]
 
 ///|
-fn yy_state_374(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_654(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(1, NT_sig_, yy_action_6)
 }
 
@@ -10562,9 +17134,9 @@ fn yy_state_374(_lookahead : YYSymbol) -> YYDecision {
 // [8, sigs → sig_ • SEMI sigs, EOF]
 
 ///|
-fn yy_state_375(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_655(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_SEMI => Shift(yy_state_376)
+    T_SEMI => Shift(yy_state_656)
     T_EOF => Reduce(1, NT_sigs, yy_action_5)
     _ => Error
   }
@@ -10582,91 +17154,133 @@ fn yy_state_375(_lookahead : YYSymbol) -> YYDecision {
 // [14, sig_ → • const_sig, EOF / SEMI]
 // [15, sig_ → • value_sig, EOF / SEMI]
 // [16, const_sig → • CONST uident COLON type_ EQUAL constant, EOF / SEMI]
-// [17, value_sig → • LET lident COLON type_, EOF / SEMI]
-// [18, value_sig → • nonempty_list(attribute) LET lident COLON type_, EOF / SEMI]
-// [21, func_sig_no_attr → • FN loption(type_params_with_constraints) method_prefix lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [22, func_sig → • func_sig_no_attr, EOF / SEMI]
-// [23, func_sig → • nonempty_list(ATTRIBUTE) func_sig_no_attr, EOF / SEMI]
-// [25, type_sig → • EXTERN TYPE type_decl_name_with_params, EOF / SEMI]
-// [26, type_sig → • PRIV EXTERN TYPE type_decl_name_with_params, EOF / SEMI]
-// [27, type_sig → • PUB pub_attr EXTERN TYPE type_decl_name_with_params, EOF / SEMI]
-// [28, type_sig → • TYPE type_decl_name_with_params, EOF / SEMI]
-// [29, type_sig → • PRIV TYPE type_decl_name_with_params, EOF / SEMI]
-// [30, type_sig → • PUB pub_attr TYPE type_decl_name_with_params, EOF / SEMI]
-// [31, type_sig → • TYPE type_decl_name_with_params type_, EOF / SEMI]
-// [32, type_sig → • PRIV TYPE type_decl_name_with_params type_, EOF / SEMI]
-// [33, type_sig → • PUB pub_attr TYPE type_decl_name_with_params type_, EOF / SEMI]
-// [34, type_sig → • SUBERROR uident, EOF / SEMI]
-// [35, type_sig → • PRIV SUBERROR uident, EOF / SEMI]
-// [36, type_sig → • PUB pub_attr SUBERROR uident, EOF / SEMI]
-// [37, type_sig → • SUBERROR uident type_, EOF / SEMI]
-// [38, type_sig → • PRIV SUBERROR uident type_, EOF / SEMI]
-// [39, type_sig → • PUB pub_attr SUBERROR uident type_, EOF / SEMI]
-// [40, type_sig → • SUBERROR uident LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
-// [41, type_sig → • PRIV SUBERROR uident LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
-// [42, type_sig → • PUB pub_attr SUBERROR uident LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
-// [43, type_sig → • STRUCT type_decl_name_with_params LBRACE separated_list(SEMI,record_decl_field) RBRACE, EOF / SEMI]
-// [44, type_sig → • PRIV STRUCT type_decl_name_with_params LBRACE separated_list(SEMI,record_decl_field) RBRACE, EOF / SEMI]
-// [45, type_sig → • PUB pub_attr STRUCT type_decl_name_with_params LBRACE separated_list(SEMI,record_decl_field) RBRACE, EOF / SEMI]
-// [46, type_sig → • STRUCT type_decl_name_with_params LPAREN separated_list(COMMA,type_) RPAREN, EOF / SEMI]
-// [47, type_sig → • PRIV STRUCT type_decl_name_with_params LPAREN separated_list(COMMA,type_) RPAREN, EOF / SEMI]
-// [48, type_sig → • PUB pub_attr STRUCT type_decl_name_with_params LPAREN separated_list(COMMA,type_) RPAREN, EOF / SEMI]
-// [49, type_sig → • ENUM type_decl_name_with_params LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
-// [50, type_sig → • PRIV ENUM type_decl_name_with_params LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
-// [51, type_sig → • PUB pub_attr ENUM type_decl_name_with_params LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
-// [52, impl_sig → • IMPL type_params_with_constraints qualified_uident FOR type_, EOF / SEMI]
-// [53, impl_sig → • IMPL qualified_uident FOR type_, EOF / SEMI]
-// [54, impl_sig → • IMPL uident COLONCOLON lident, EOF / SEMI]
-// [55, trait_sig → • TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
-// [56, trait_sig → • PRIV TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
-// [57, trait_sig → • PUB pub_attr TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
-// [58, trait_sig → • TRAIT uident, EOF / SEMI]
-// [59, trait_sig → • PRIV TRAIT uident, EOF / SEMI]
-// [60, trait_sig → • PUB pub_attr TRAIT uident, EOF / SEMI]
-// [61, alias_sig → • TYPEALIAS type_ AS type_decl_name_with_params, EOF / SEMI]
-// [62, alias_sig → • PRIV TYPEALIAS type_ AS type_decl_name_with_params, EOF / SEMI]
-// [63, alias_sig → • PUB pub_attr TYPEALIAS type_ AS type_decl_name_with_params, EOF / SEMI]
-// [64, alias_sig → • TRAITALIAS qualified_uident AS uident, EOF / SEMI]
-// [65, alias_sig → • PRIV TRAITALIAS qualified_uident AS uident, EOF / SEMI]
-// [66, alias_sig → • PUB pub_attr TRAITALIAS qualified_uident AS uident, EOF / SEMI]
-// [67, alias_sig → • FNALIAS qualified_uident COLONCOLON lident, EOF / SEMI]
-// [139, nonempty_list(ATTRIBUTE) → • ATTRIBUTE, FN]
-// [140, nonempty_list(ATTRIBUTE) → • ATTRIBUTE nonempty_list(ATTRIBUTE), FN]
-// [173, nonempty_list(attribute) → • ATTRIBUTE, LET]
-// [174, nonempty_list(attribute) → • ATTRIBUTE nonempty_list(attribute), LET]
-
-///|
-fn yy_state_376(_lookahead : YYSymbol) -> YYDecision {
+// [17, const_sig → • PRIV CONST uident COLON type_ EQUAL constant, EOF / SEMI]
+// [18, const_sig → • PUB pub_attr CONST uident COLON type_ EQUAL constant, EOF / SEMI]
+// [19, const_sig → • nonempty_list(attribute) CONST uident COLON type_ EQUAL constant, EOF / SEMI]
+// [20, const_sig → • nonempty_list(attribute) PRIV CONST uident COLON type_ EQUAL constant, EOF / SEMI]
+// [21, const_sig → • nonempty_list(attribute) PUB pub_attr CONST uident COLON type_ EQUAL constant, EOF / SEMI]
+// [22, value_sig → • LET lident COLON type_, EOF / SEMI]
+// [23, value_sig → • PRIV LET lident COLON type_, EOF / SEMI]
+// [24, value_sig → • PUB pub_attr LET lident COLON type_, EOF / SEMI]
+// [25, value_sig → • nonempty_list(attribute) LET lident COLON type_, EOF / SEMI]
+// [26, value_sig → • nonempty_list(attribute) PRIV LET lident COLON type_, EOF / SEMI]
+// [27, value_sig → • nonempty_list(attribute) PUB pub_attr LET lident COLON type_, EOF / SEMI]
+// [32, func_sig → • ASYNC FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [33, func_sig → • FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [34, func_sig → • nonempty_list(attribute) ASYNC FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [35, func_sig → • nonempty_list(attribute) FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [38, type_sig → • TYPE type_decl_name_with_params, EOF / SEMI]
+// [39, type_sig → • PRIV TYPE type_decl_name_with_params, EOF / SEMI]
+// [40, type_sig → • PUB pub_attr TYPE type_decl_name_with_params, EOF / SEMI]
+// [41, type_sig → • nonempty_list(attribute) TYPE type_decl_name_with_params, EOF / SEMI]
+// [42, type_sig → • nonempty_list(attribute) PRIV TYPE type_decl_name_with_params, EOF / SEMI]
+// [43, type_sig → • nonempty_list(attribute) PUB pub_attr TYPE type_decl_name_with_params, EOF / SEMI]
+// [44, type_sig → • SUBERROR uident option(type_), EOF / SEMI]
+// [45, type_sig → • PRIV SUBERROR uident option(type_), EOF / SEMI]
+// [46, type_sig → • PUB pub_attr SUBERROR uident option(type_), EOF / SEMI]
+// [47, type_sig → • nonempty_list(attribute) SUBERROR uident option(type_), EOF / SEMI]
+// [48, type_sig → • nonempty_list(attribute) PRIV SUBERROR uident option(type_), EOF / SEMI]
+// [49, type_sig → • nonempty_list(attribute) PUB pub_attr SUBERROR uident option(type_), EOF / SEMI]
+// [50, type_sig → • SUBERROR uident LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [51, type_sig → • PRIV SUBERROR uident LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [52, type_sig → • PUB pub_attr SUBERROR uident LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [53, type_sig → • nonempty_list(attribute) SUBERROR uident LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [54, type_sig → • nonempty_list(attribute) PRIV SUBERROR uident LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [55, type_sig → • nonempty_list(attribute) PUB pub_attr SUBERROR uident LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [56, type_sig → • STRUCT type_decl_name_with_params LBRACE record_decl_body RBRACE, EOF / SEMI]
+// [57, type_sig → • PRIV STRUCT type_decl_name_with_params LBRACE record_decl_body RBRACE, EOF / SEMI]
+// [58, type_sig → • PUB pub_attr STRUCT type_decl_name_with_params LBRACE record_decl_body RBRACE, EOF / SEMI]
+// [59, type_sig → • nonempty_list(attribute) STRUCT type_decl_name_with_params LBRACE record_decl_body RBRACE, EOF / SEMI]
+// [60, type_sig → • nonempty_list(attribute) PRIV STRUCT type_decl_name_with_params LBRACE record_decl_body RBRACE, EOF / SEMI]
+// [61, type_sig → • nonempty_list(attribute) PUB pub_attr STRUCT type_decl_name_with_params LBRACE record_decl_body RBRACE, EOF / SEMI]
+// [62, type_sig → • STRUCT type_decl_name_with_params LPAREN separated_list(COMMA,type_) RPAREN, EOF / SEMI]
+// [63, type_sig → • PRIV STRUCT type_decl_name_with_params LPAREN separated_list(COMMA,type_) RPAREN, EOF / SEMI]
+// [64, type_sig → • PUB pub_attr STRUCT type_decl_name_with_params LPAREN separated_list(COMMA,type_) RPAREN, EOF / SEMI]
+// [65, type_sig → • nonempty_list(attribute) STRUCT type_decl_name_with_params LPAREN separated_list(COMMA,type_) RPAREN, EOF / SEMI]
+// [66, type_sig → • nonempty_list(attribute) PRIV STRUCT type_decl_name_with_params LPAREN separated_list(COMMA,type_) RPAREN, EOF / SEMI]
+// [67, type_sig → • nonempty_list(attribute) PUB pub_attr STRUCT type_decl_name_with_params LPAREN separated_list(COMMA,type_) RPAREN, EOF / SEMI]
+// [68, type_sig → • ENUM type_decl_name_with_params LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [69, type_sig → • PRIV ENUM type_decl_name_with_params LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [70, type_sig → • PUB pub_attr ENUM type_decl_name_with_params LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [71, type_sig → • nonempty_list(attribute) ENUM type_decl_name_with_params LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [72, type_sig → • nonempty_list(attribute) PRIV ENUM type_decl_name_with_params LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [73, type_sig → • nonempty_list(attribute) PUB pub_attr ENUM type_decl_name_with_params LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [74, impl_sig → • IMPL type_params_with_constraints qualified_uident FOR type_, EOF / SEMI]
+// [75, impl_sig → • PRIV IMPL type_params_with_constraints qualified_uident FOR type_, EOF / SEMI]
+// [76, impl_sig → • PUB pub_attr IMPL type_params_with_constraints qualified_uident FOR type_, EOF / SEMI]
+// [77, impl_sig → • nonempty_list(attribute) IMPL type_params_with_constraints qualified_uident FOR type_, EOF / SEMI]
+// [78, impl_sig → • nonempty_list(attribute) PRIV IMPL type_params_with_constraints qualified_uident FOR type_, EOF / SEMI]
+// [79, impl_sig → • nonempty_list(attribute) PUB pub_attr IMPL type_params_with_constraints qualified_uident FOR type_, EOF / SEMI]
+// [80, impl_sig → • IMPL qualified_uident FOR type_, EOF / SEMI]
+// [81, impl_sig → • PRIV IMPL qualified_uident FOR type_, EOF / SEMI]
+// [82, impl_sig → • PUB pub_attr IMPL qualified_uident FOR type_, EOF / SEMI]
+// [83, impl_sig → • nonempty_list(attribute) IMPL qualified_uident FOR type_, EOF / SEMI]
+// [84, impl_sig → • nonempty_list(attribute) PRIV IMPL qualified_uident FOR type_, EOF / SEMI]
+// [85, impl_sig → • nonempty_list(attribute) PUB pub_attr IMPL qualified_uident FOR type_, EOF / SEMI]
+// [86, trait_sig → • TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
+// [87, trait_sig → • PRIV TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
+// [88, trait_sig → • PUB pub_attr TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
+// [89, trait_sig → • nonempty_list(attribute) TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
+// [90, trait_sig → • nonempty_list(attribute) PRIV TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
+// [91, trait_sig → • nonempty_list(attribute) PUB pub_attr TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
+// [92, trait_sig → • TRAIT uident, EOF / SEMI]
+// [93, trait_sig → • PRIV TRAIT uident, EOF / SEMI]
+// [94, trait_sig → • PUB pub_attr TRAIT uident, EOF / SEMI]
+// [95, trait_sig → • nonempty_list(attribute) TRAIT uident, EOF / SEMI]
+// [96, trait_sig → • nonempty_list(attribute) PRIV TRAIT uident, EOF / SEMI]
+// [97, trait_sig → • nonempty_list(attribute) PUB pub_attr TRAIT uident, EOF / SEMI]
+// [100, alias_sig → • TYPE type_decl_name_with_params EQUAL type_, EOF / SEMI]
+// [101, alias_sig → • PRIV TYPE type_decl_name_with_params EQUAL type_, EOF / SEMI]
+// [102, alias_sig → • PUB pub_attr TYPE type_decl_name_with_params EQUAL type_, EOF / SEMI]
+// [103, alias_sig → • nonempty_list(attribute) TYPE type_decl_name_with_params EQUAL type_, EOF / SEMI]
+// [104, alias_sig → • nonempty_list(attribute) PRIV TYPE type_decl_name_with_params EQUAL type_, EOF / SEMI]
+// [105, alias_sig → • nonempty_list(attribute) PUB pub_attr TYPE type_decl_name_with_params EQUAL type_, EOF / SEMI]
+// [106, alias_sig → • FNALIAS uident COLONCOLON lident, EOF / SEMI]
+// [107, alias_sig → • nonempty_list(attribute) FNALIAS uident COLONCOLON lident, EOF / SEMI]
+// [108, alias_sig → • USING PACKAGE_NAME LBRACE TYPE uident using_binder RBRACE, EOF / SEMI]
+// [109, alias_sig → • PRIV USING PACKAGE_NAME LBRACE TYPE uident using_binder RBRACE, EOF / SEMI]
+// [110, alias_sig → • PUB pub_attr USING PACKAGE_NAME LBRACE TYPE uident using_binder RBRACE, EOF / SEMI]
+// [111, alias_sig → • nonempty_list(attribute) USING PACKAGE_NAME LBRACE TYPE uident using_binder RBRACE, EOF / SEMI]
+// [112, alias_sig → • nonempty_list(attribute) PRIV USING PACKAGE_NAME LBRACE TYPE uident using_binder RBRACE, EOF / SEMI]
+// [113, alias_sig → • nonempty_list(attribute) PUB pub_attr USING PACKAGE_NAME LBRACE TYPE uident using_binder RBRACE, EOF / SEMI]
+// [114, alias_sig → • USING PACKAGE_NAME LBRACE TRAIT uident using_binder RBRACE, EOF / SEMI]
+// [115, alias_sig → • PRIV USING PACKAGE_NAME LBRACE TRAIT uident using_binder RBRACE, EOF / SEMI]
+// [116, alias_sig → • PUB pub_attr USING PACKAGE_NAME LBRACE TRAIT uident using_binder RBRACE, EOF / SEMI]
+// [117, alias_sig → • nonempty_list(attribute) USING PACKAGE_NAME LBRACE TRAIT uident using_binder RBRACE, EOF / SEMI]
+// [118, alias_sig → • nonempty_list(attribute) PRIV USING PACKAGE_NAME LBRACE TRAIT uident using_binder RBRACE, EOF / SEMI]
+// [119, alias_sig → • nonempty_list(attribute) PUB pub_attr USING PACKAGE_NAME LBRACE TRAIT uident using_binder RBRACE, EOF / SEMI]
+// [229, nonempty_list(attribute) → • ATTRIBUTE, PUB / PRIV / STRUCT / ENUM / TRAIT / IMPL / ASYNC / FNALIAS / FN / LET / CONST / TYPE / SUBERROR / USING]
+// [230, nonempty_list(attribute) → • ATTRIBUTE nonempty_list(attribute), PUB / PRIV / STRUCT / ENUM / TRAIT / IMPL / ASYNC / FNALIAS / FN / LET / CONST / TYPE / SUBERROR / USING]
+
+///|
+fn yy_state_656(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ATTRIBUTE => Shift(yy_state_17)
-    T_FNALIAS => Shift(yy_state_20)
-    T_TRAITALIAS => Shift(yy_state_28)
-    T_TYPEALIAS => Shift(yy_state_33)
-    T_TRAIT => Shift(yy_state_104)
-    T_IMPL => Shift(yy_state_136)
-    T_ENUM => Shift(yy_state_162)
-    T_STRUCT => Shift(yy_state_193)
-    T_SUBERROR => Shift(yy_state_215)
-    T_TYPE => Shift(yy_state_221)
-    T_PUB => Shift(yy_state_224)
-    T_PRIV => Shift(yy_state_270)
-    T_EXTERN => Shift(yy_state_310)
-    NT_nonempty_list_ATTRIBUTE_ => Shift(yy_state_313)
-    T_FN => Shift(yy_state_315)
-    NT_func_sig_no_attr => Shift(yy_state_343)
-    NT_nonempty_list_attribute_ => Shift(yy_state_344)
-    T_LET => Shift(yy_state_349)
-    T_CONST => Shift(yy_state_353)
-    NT_value_sig => Shift(yy_state_368)
-    NT_const_sig => Shift(yy_state_369)
-    NT_impl_sig => Shift(yy_state_370)
-    NT_trait_sig => Shift(yy_state_371)
-    NT_alias_sig => Shift(yy_state_372)
-    NT_type_sig => Shift(yy_state_373)
-    NT_func_sig => Shift(yy_state_374)
-    NT_sig_ => Shift(yy_state_375)
-    NT_sigs => Shift(yy_state_377)
-    T_EOF => Reduce(0, NT_sigs, yy_action_199)
+    T_USING => Shift(yy_state_19)
+    T_FNALIAS => Shift(yy_state_33)
+    T_TRAIT => Shift(yy_state_38)
+    T_IMPL => Shift(yy_state_141)
+    T_ENUM => Shift(yy_state_163)
+    T_STRUCT => Shift(yy_state_205)
+    T_SUBERROR => Shift(yy_state_274)
+    T_TYPE => Shift(yy_state_281)
+    T_FN => Shift(yy_state_285)
+    T_ASYNC => Shift(yy_state_294)
+    T_LET => Shift(yy_state_304)
+    NT_nonempty_list_attribute_ => Shift(yy_state_308)
+    T_PUB => Shift(yy_state_523)
+    T_PRIV => Shift(yy_state_583)
+    T_CONST => Shift(yy_state_642)
+    NT_value_sig => Shift(yy_state_648)
+    NT_const_sig => Shift(yy_state_649)
+    NT_impl_sig => Shift(yy_state_650)
+    NT_trait_sig => Shift(yy_state_651)
+    NT_alias_sig => Shift(yy_state_652)
+    NT_type_sig => Shift(yy_state_653)
+    NT_func_sig => Shift(yy_state_654)
+    NT_sig_ => Shift(yy_state_655)
+    NT_sigs => Shift(yy_state_657)
+    T_EOF => Reduce(0, NT_sigs, yy_action_248)
     _ => Error
   }
 }
@@ -10674,28 +17288,28 @@ fn yy_state_376(_lookahead : YYSymbol) -> YYDecision {
 // [8, sigs → sig_ SEMI sigs •, EOF]
 
 ///|
-fn yy_state_377(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_657(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(3, NT_sigs, yy_action_4)
 }
 
-// [1, mbti → LIDENT STRING SEMI imports sigs • EOF, $]
+// [1, mbti → PACKAGE STRING SEMI imports sigs • EOF, $]
 
 ///|
-fn yy_state_378(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_658(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_EOF => Shift(yy_state_379)
+    T_EOF => Shift(yy_state_659)
     _ => Error
   }
 }
 
-// [1, mbti → LIDENT STRING SEMI imports sigs EOF •, $]
+// [1, mbti → PACKAGE STRING SEMI imports sigs EOF •, $]
 
 ///|
-fn yy_state_379(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_659(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(6, NT_mbti, yy_action_2)
 }
 
-// [0, mbti → LIDENT STRING imports • sigs EOF, $]
+// [0, mbti → PACKAGE STRING imports • sigs EOF, $]
 // [6, sigs → •, EOF]
 // [7, sigs → • sig_, EOF]
 // [8, sigs → • sig_ SEMI sigs, EOF]
@@ -10707,109 +17321,151 @@ fn yy_state_379(_lookahead : YYSymbol) -> YYDecision {
 // [14, sig_ → • const_sig, EOF / SEMI]
 // [15, sig_ → • value_sig, EOF / SEMI]
 // [16, const_sig → • CONST uident COLON type_ EQUAL constant, EOF / SEMI]
-// [17, value_sig → • LET lident COLON type_, EOF / SEMI]
-// [18, value_sig → • nonempty_list(attribute) LET lident COLON type_, EOF / SEMI]
-// [21, func_sig_no_attr → • FN loption(type_params_with_constraints) method_prefix lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, EOF / SEMI]
-// [22, func_sig → • func_sig_no_attr, EOF / SEMI]
-// [23, func_sig → • nonempty_list(ATTRIBUTE) func_sig_no_attr, EOF / SEMI]
-// [25, type_sig → • EXTERN TYPE type_decl_name_with_params, EOF / SEMI]
-// [26, type_sig → • PRIV EXTERN TYPE type_decl_name_with_params, EOF / SEMI]
-// [27, type_sig → • PUB pub_attr EXTERN TYPE type_decl_name_with_params, EOF / SEMI]
-// [28, type_sig → • TYPE type_decl_name_with_params, EOF / SEMI]
-// [29, type_sig → • PRIV TYPE type_decl_name_with_params, EOF / SEMI]
-// [30, type_sig → • PUB pub_attr TYPE type_decl_name_with_params, EOF / SEMI]
-// [31, type_sig → • TYPE type_decl_name_with_params type_, EOF / SEMI]
-// [32, type_sig → • PRIV TYPE type_decl_name_with_params type_, EOF / SEMI]
-// [33, type_sig → • PUB pub_attr TYPE type_decl_name_with_params type_, EOF / SEMI]
-// [34, type_sig → • SUBERROR uident, EOF / SEMI]
-// [35, type_sig → • PRIV SUBERROR uident, EOF / SEMI]
-// [36, type_sig → • PUB pub_attr SUBERROR uident, EOF / SEMI]
-// [37, type_sig → • SUBERROR uident type_, EOF / SEMI]
-// [38, type_sig → • PRIV SUBERROR uident type_, EOF / SEMI]
-// [39, type_sig → • PUB pub_attr SUBERROR uident type_, EOF / SEMI]
-// [40, type_sig → • SUBERROR uident LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
-// [41, type_sig → • PRIV SUBERROR uident LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
-// [42, type_sig → • PUB pub_attr SUBERROR uident LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
-// [43, type_sig → • STRUCT type_decl_name_with_params LBRACE separated_list(SEMI,record_decl_field) RBRACE, EOF / SEMI]
-// [44, type_sig → • PRIV STRUCT type_decl_name_with_params LBRACE separated_list(SEMI,record_decl_field) RBRACE, EOF / SEMI]
-// [45, type_sig → • PUB pub_attr STRUCT type_decl_name_with_params LBRACE separated_list(SEMI,record_decl_field) RBRACE, EOF / SEMI]
-// [46, type_sig → • STRUCT type_decl_name_with_params LPAREN separated_list(COMMA,type_) RPAREN, EOF / SEMI]
-// [47, type_sig → • PRIV STRUCT type_decl_name_with_params LPAREN separated_list(COMMA,type_) RPAREN, EOF / SEMI]
-// [48, type_sig → • PUB pub_attr STRUCT type_decl_name_with_params LPAREN separated_list(COMMA,type_) RPAREN, EOF / SEMI]
-// [49, type_sig → • ENUM type_decl_name_with_params LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
-// [50, type_sig → • PRIV ENUM type_decl_name_with_params LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
-// [51, type_sig → • PUB pub_attr ENUM type_decl_name_with_params LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
-// [52, impl_sig → • IMPL type_params_with_constraints qualified_uident FOR type_, EOF / SEMI]
-// [53, impl_sig → • IMPL qualified_uident FOR type_, EOF / SEMI]
-// [54, impl_sig → • IMPL uident COLONCOLON lident, EOF / SEMI]
-// [55, trait_sig → • TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
-// [56, trait_sig → • PRIV TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
-// [57, trait_sig → • PUB pub_attr TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
-// [58, trait_sig → • TRAIT uident, EOF / SEMI]
-// [59, trait_sig → • PRIV TRAIT uident, EOF / SEMI]
-// [60, trait_sig → • PUB pub_attr TRAIT uident, EOF / SEMI]
-// [61, alias_sig → • TYPEALIAS type_ AS type_decl_name_with_params, EOF / SEMI]
-// [62, alias_sig → • PRIV TYPEALIAS type_ AS type_decl_name_with_params, EOF / SEMI]
-// [63, alias_sig → • PUB pub_attr TYPEALIAS type_ AS type_decl_name_with_params, EOF / SEMI]
-// [64, alias_sig → • TRAITALIAS qualified_uident AS uident, EOF / SEMI]
-// [65, alias_sig → • PRIV TRAITALIAS qualified_uident AS uident, EOF / SEMI]
-// [66, alias_sig → • PUB pub_attr TRAITALIAS qualified_uident AS uident, EOF / SEMI]
-// [67, alias_sig → • FNALIAS qualified_uident COLONCOLON lident, EOF / SEMI]
-// [139, nonempty_list(ATTRIBUTE) → • ATTRIBUTE, FN]
-// [140, nonempty_list(ATTRIBUTE) → • ATTRIBUTE nonempty_list(ATTRIBUTE), FN]
-// [173, nonempty_list(attribute) → • ATTRIBUTE, LET]
-// [174, nonempty_list(attribute) → • ATTRIBUTE nonempty_list(attribute), LET]
-
-///|
-fn yy_state_380(_lookahead : YYSymbol) -> YYDecision {
+// [17, const_sig → • PRIV CONST uident COLON type_ EQUAL constant, EOF / SEMI]
+// [18, const_sig → • PUB pub_attr CONST uident COLON type_ EQUAL constant, EOF / SEMI]
+// [19, const_sig → • nonempty_list(attribute) CONST uident COLON type_ EQUAL constant, EOF / SEMI]
+// [20, const_sig → • nonempty_list(attribute) PRIV CONST uident COLON type_ EQUAL constant, EOF / SEMI]
+// [21, const_sig → • nonempty_list(attribute) PUB pub_attr CONST uident COLON type_ EQUAL constant, EOF / SEMI]
+// [22, value_sig → • LET lident COLON type_, EOF / SEMI]
+// [23, value_sig → • PRIV LET lident COLON type_, EOF / SEMI]
+// [24, value_sig → • PUB pub_attr LET lident COLON type_, EOF / SEMI]
+// [25, value_sig → • nonempty_list(attribute) LET lident COLON type_, EOF / SEMI]
+// [26, value_sig → • nonempty_list(attribute) PRIV LET lident COLON type_, EOF / SEMI]
+// [27, value_sig → • nonempty_list(attribute) PUB pub_attr LET lident COLON type_, EOF / SEMI]
+// [32, func_sig → • ASYNC FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [33, func_sig → • FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [34, func_sig → • nonempty_list(attribute) ASYNC FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [35, func_sig → • nonempty_list(attribute) FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident LPAREN separated_list(COMMA,parameter) RPAREN THIN_ARROW return_type, EOF / SEMI]
+// [38, type_sig → • TYPE type_decl_name_with_params, EOF / SEMI]
+// [39, type_sig → • PRIV TYPE type_decl_name_with_params, EOF / SEMI]
+// [40, type_sig → • PUB pub_attr TYPE type_decl_name_with_params, EOF / SEMI]
+// [41, type_sig → • nonempty_list(attribute) TYPE type_decl_name_with_params, EOF / SEMI]
+// [42, type_sig → • nonempty_list(attribute) PRIV TYPE type_decl_name_with_params, EOF / SEMI]
+// [43, type_sig → • nonempty_list(attribute) PUB pub_attr TYPE type_decl_name_with_params, EOF / SEMI]
+// [44, type_sig → • SUBERROR uident option(type_), EOF / SEMI]
+// [45, type_sig → • PRIV SUBERROR uident option(type_), EOF / SEMI]
+// [46, type_sig → • PUB pub_attr SUBERROR uident option(type_), EOF / SEMI]
+// [47, type_sig → • nonempty_list(attribute) SUBERROR uident option(type_), EOF / SEMI]
+// [48, type_sig → • nonempty_list(attribute) PRIV SUBERROR uident option(type_), EOF / SEMI]
+// [49, type_sig → • nonempty_list(attribute) PUB pub_attr SUBERROR uident option(type_), EOF / SEMI]
+// [50, type_sig → • SUBERROR uident LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [51, type_sig → • PRIV SUBERROR uident LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [52, type_sig → • PUB pub_attr SUBERROR uident LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [53, type_sig → • nonempty_list(attribute) SUBERROR uident LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [54, type_sig → • nonempty_list(attribute) PRIV SUBERROR uident LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [55, type_sig → • nonempty_list(attribute) PUB pub_attr SUBERROR uident LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [56, type_sig → • STRUCT type_decl_name_with_params LBRACE record_decl_body RBRACE, EOF / SEMI]
+// [57, type_sig → • PRIV STRUCT type_decl_name_with_params LBRACE record_decl_body RBRACE, EOF / SEMI]
+// [58, type_sig → • PUB pub_attr STRUCT type_decl_name_with_params LBRACE record_decl_body RBRACE, EOF / SEMI]
+// [59, type_sig → • nonempty_list(attribute) STRUCT type_decl_name_with_params LBRACE record_decl_body RBRACE, EOF / SEMI]
+// [60, type_sig → • nonempty_list(attribute) PRIV STRUCT type_decl_name_with_params LBRACE record_decl_body RBRACE, EOF / SEMI]
+// [61, type_sig → • nonempty_list(attribute) PUB pub_attr STRUCT type_decl_name_with_params LBRACE record_decl_body RBRACE, EOF / SEMI]
+// [62, type_sig → • STRUCT type_decl_name_with_params LPAREN separated_list(COMMA,type_) RPAREN, EOF / SEMI]
+// [63, type_sig → • PRIV STRUCT type_decl_name_with_params LPAREN separated_list(COMMA,type_) RPAREN, EOF / SEMI]
+// [64, type_sig → • PUB pub_attr STRUCT type_decl_name_with_params LPAREN separated_list(COMMA,type_) RPAREN, EOF / SEMI]
+// [65, type_sig → • nonempty_list(attribute) STRUCT type_decl_name_with_params LPAREN separated_list(COMMA,type_) RPAREN, EOF / SEMI]
+// [66, type_sig → • nonempty_list(attribute) PRIV STRUCT type_decl_name_with_params LPAREN separated_list(COMMA,type_) RPAREN, EOF / SEMI]
+// [67, type_sig → • nonempty_list(attribute) PUB pub_attr STRUCT type_decl_name_with_params LPAREN separated_list(COMMA,type_) RPAREN, EOF / SEMI]
+// [68, type_sig → • ENUM type_decl_name_with_params LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [69, type_sig → • PRIV ENUM type_decl_name_with_params LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [70, type_sig → • PUB pub_attr ENUM type_decl_name_with_params LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [71, type_sig → • nonempty_list(attribute) ENUM type_decl_name_with_params LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [72, type_sig → • nonempty_list(attribute) PRIV ENUM type_decl_name_with_params LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [73, type_sig → • nonempty_list(attribute) PUB pub_attr ENUM type_decl_name_with_params LBRACE separated_list(SEMI,enum_constructor) RBRACE, EOF / SEMI]
+// [74, impl_sig → • IMPL type_params_with_constraints qualified_uident FOR type_, EOF / SEMI]
+// [75, impl_sig → • PRIV IMPL type_params_with_constraints qualified_uident FOR type_, EOF / SEMI]
+// [76, impl_sig → • PUB pub_attr IMPL type_params_with_constraints qualified_uident FOR type_, EOF / SEMI]
+// [77, impl_sig → • nonempty_list(attribute) IMPL type_params_with_constraints qualified_uident FOR type_, EOF / SEMI]
+// [78, impl_sig → • nonempty_list(attribute) PRIV IMPL type_params_with_constraints qualified_uident FOR type_, EOF / SEMI]
+// [79, impl_sig → • nonempty_list(attribute) PUB pub_attr IMPL type_params_with_constraints qualified_uident FOR type_, EOF / SEMI]
+// [80, impl_sig → • IMPL qualified_uident FOR type_, EOF / SEMI]
+// [81, impl_sig → • PRIV IMPL qualified_uident FOR type_, EOF / SEMI]
+// [82, impl_sig → • PUB pub_attr IMPL qualified_uident FOR type_, EOF / SEMI]
+// [83, impl_sig → • nonempty_list(attribute) IMPL qualified_uident FOR type_, EOF / SEMI]
+// [84, impl_sig → • nonempty_list(attribute) PRIV IMPL qualified_uident FOR type_, EOF / SEMI]
+// [85, impl_sig → • nonempty_list(attribute) PUB pub_attr IMPL qualified_uident FOR type_, EOF / SEMI]
+// [86, trait_sig → • TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
+// [87, trait_sig → • PRIV TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
+// [88, trait_sig → • PUB pub_attr TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
+// [89, trait_sig → • nonempty_list(attribute) TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
+// [90, trait_sig → • nonempty_list(attribute) PRIV TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
+// [91, trait_sig → • nonempty_list(attribute) PUB pub_attr TRAIT uident loption(preceded(COLON,separated_nonempty_list(PLUS,qualified_uident))) LBRACE separated_nonempty_list(SEMI,trait_method_sig) RBRACE, EOF / SEMI]
+// [92, trait_sig → • TRAIT uident, EOF / SEMI]
+// [93, trait_sig → • PRIV TRAIT uident, EOF / SEMI]
+// [94, trait_sig → • PUB pub_attr TRAIT uident, EOF / SEMI]
+// [95, trait_sig → • nonempty_list(attribute) TRAIT uident, EOF / SEMI]
+// [96, trait_sig → • nonempty_list(attribute) PRIV TRAIT uident, EOF / SEMI]
+// [97, trait_sig → • nonempty_list(attribute) PUB pub_attr TRAIT uident, EOF / SEMI]
+// [100, alias_sig → • TYPE type_decl_name_with_params EQUAL type_, EOF / SEMI]
+// [101, alias_sig → • PRIV TYPE type_decl_name_with_params EQUAL type_, EOF / SEMI]
+// [102, alias_sig → • PUB pub_attr TYPE type_decl_name_with_params EQUAL type_, EOF / SEMI]
+// [103, alias_sig → • nonempty_list(attribute) TYPE type_decl_name_with_params EQUAL type_, EOF / SEMI]
+// [104, alias_sig → • nonempty_list(attribute) PRIV TYPE type_decl_name_with_params EQUAL type_, EOF / SEMI]
+// [105, alias_sig → • nonempty_list(attribute) PUB pub_attr TYPE type_decl_name_with_params EQUAL type_, EOF / SEMI]
+// [106, alias_sig → • FNALIAS uident COLONCOLON lident, EOF / SEMI]
+// [107, alias_sig → • nonempty_list(attribute) FNALIAS uident COLONCOLON lident, EOF / SEMI]
+// [108, alias_sig → • USING PACKAGE_NAME LBRACE TYPE uident using_binder RBRACE, EOF / SEMI]
+// [109, alias_sig → • PRIV USING PACKAGE_NAME LBRACE TYPE uident using_binder RBRACE, EOF / SEMI]
+// [110, alias_sig → • PUB pub_attr USING PACKAGE_NAME LBRACE TYPE uident using_binder RBRACE, EOF / SEMI]
+// [111, alias_sig → • nonempty_list(attribute) USING PACKAGE_NAME LBRACE TYPE uident using_binder RBRACE, EOF / SEMI]
+// [112, alias_sig → • nonempty_list(attribute) PRIV USING PACKAGE_NAME LBRACE TYPE uident using_binder RBRACE, EOF / SEMI]
+// [113, alias_sig → • nonempty_list(attribute) PUB pub_attr USING PACKAGE_NAME LBRACE TYPE uident using_binder RBRACE, EOF / SEMI]
+// [114, alias_sig → • USING PACKAGE_NAME LBRACE TRAIT uident using_binder RBRACE, EOF / SEMI]
+// [115, alias_sig → • PRIV USING PACKAGE_NAME LBRACE TRAIT uident using_binder RBRACE, EOF / SEMI]
+// [116, alias_sig → • PUB pub_attr USING PACKAGE_NAME LBRACE TRAIT uident using_binder RBRACE, EOF / SEMI]
+// [117, alias_sig → • nonempty_list(attribute) USING PACKAGE_NAME LBRACE TRAIT uident using_binder RBRACE, EOF / SEMI]
+// [118, alias_sig → • nonempty_list(attribute) PRIV USING PACKAGE_NAME LBRACE TRAIT uident using_binder RBRACE, EOF / SEMI]
+// [119, alias_sig → • nonempty_list(attribute) PUB pub_attr USING PACKAGE_NAME LBRACE TRAIT uident using_binder RBRACE, EOF / SEMI]
+// [229, nonempty_list(attribute) → • ATTRIBUTE, PUB / PRIV / STRUCT / ENUM / TRAIT / IMPL / ASYNC / FNALIAS / FN / LET / CONST / TYPE / SUBERROR / USING]
+// [230, nonempty_list(attribute) → • ATTRIBUTE nonempty_list(attribute), PUB / PRIV / STRUCT / ENUM / TRAIT / IMPL / ASYNC / FNALIAS / FN / LET / CONST / TYPE / SUBERROR / USING]
+
+///|
+fn yy_state_660(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ATTRIBUTE => Shift(yy_state_17)
-    T_FNALIAS => Shift(yy_state_20)
-    T_TRAITALIAS => Shift(yy_state_28)
-    T_TYPEALIAS => Shift(yy_state_33)
-    T_TRAIT => Shift(yy_state_104)
-    T_IMPL => Shift(yy_state_136)
-    T_ENUM => Shift(yy_state_162)
-    T_STRUCT => Shift(yy_state_193)
-    T_SUBERROR => Shift(yy_state_215)
-    T_TYPE => Shift(yy_state_221)
-    T_PUB => Shift(yy_state_224)
-    T_PRIV => Shift(yy_state_270)
-    T_EXTERN => Shift(yy_state_310)
-    NT_nonempty_list_ATTRIBUTE_ => Shift(yy_state_313)
-    T_FN => Shift(yy_state_315)
-    NT_func_sig_no_attr => Shift(yy_state_343)
-    NT_nonempty_list_attribute_ => Shift(yy_state_344)
-    T_LET => Shift(yy_state_349)
-    T_CONST => Shift(yy_state_353)
-    NT_value_sig => Shift(yy_state_368)
-    NT_const_sig => Shift(yy_state_369)
-    NT_impl_sig => Shift(yy_state_370)
-    NT_trait_sig => Shift(yy_state_371)
-    NT_alias_sig => Shift(yy_state_372)
-    NT_type_sig => Shift(yy_state_373)
-    NT_func_sig => Shift(yy_state_374)
-    NT_sig_ => Shift(yy_state_375)
-    NT_sigs => Shift(yy_state_381)
-    T_EOF => Reduce(0, NT_sigs, yy_action_199)
-    _ => Error
-  }
-}
-
-// [0, mbti → LIDENT STRING imports sigs • EOF, $]
+    T_USING => Shift(yy_state_19)
+    T_FNALIAS => Shift(yy_state_33)
+    T_TRAIT => Shift(yy_state_38)
+    T_IMPL => Shift(yy_state_141)
+    T_ENUM => Shift(yy_state_163)
+    T_STRUCT => Shift(yy_state_205)
+    T_SUBERROR => Shift(yy_state_274)
+    T_TYPE => Shift(yy_state_281)
+    T_FN => Shift(yy_state_285)
+    T_ASYNC => Shift(yy_state_294)
+    T_LET => Shift(yy_state_304)
+    NT_nonempty_list_attribute_ => Shift(yy_state_308)
+    T_PUB => Shift(yy_state_523)
+    T_PRIV => Shift(yy_state_583)
+    T_CONST => Shift(yy_state_642)
+    NT_value_sig => Shift(yy_state_648)
+    NT_const_sig => Shift(yy_state_649)
+    NT_impl_sig => Shift(yy_state_650)
+    NT_trait_sig => Shift(yy_state_651)
+    NT_alias_sig => Shift(yy_state_652)
+    NT_type_sig => Shift(yy_state_653)
+    NT_func_sig => Shift(yy_state_654)
+    NT_sig_ => Shift(yy_state_655)
+    NT_sigs => Shift(yy_state_661)
+    T_EOF => Reduce(0, NT_sigs, yy_action_248)
+    _ => Error
+  }
+}
+
+// [0, mbti → PACKAGE STRING imports sigs • EOF, $]
 
 ///|
-fn yy_state_381(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_661(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_EOF => Shift(yy_state_382)
+    T_EOF => Shift(yy_state_662)
     _ => Error
   }
 }
 
-// [0, mbti → LIDENT STRING imports sigs EOF •, $]
+// [0, mbti → PACKAGE STRING imports sigs EOF •, $]
 
 ///|
-fn yy_state_382(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_662(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(5, NT_mbti, yy_action_0)
 }
 
@@ -11046,12 +17702,14 @@ fn error(
         (T_USING, TK_USING),
         (T_DECLARE, TK_DECLARE),
         (T_NORAISE, TK_NORAISE),
+        (T_NOBREAK, TK_NOBREAK),
         (T_WHERE, TK_WHERE),
         (T_ENUMVIEW, TK_ENUMVIEW),
         (T_TRY_QUESTION, TK_TRY_QUESTION),
         (T_TRY_EXCLAMATION, TK_TRY_EXCLAMATION),
         (T_LEXMATCH, TK_LEXMATCH),
         (T_LEXMATCH_QUESTION, TK_LEXMATCH_QUESTION),
+        (T_PACKAGE, TK_PACKAGE),
       ] : Array[(YYSymbol, TokenKind)]) {
     try_add(term.0, term.1)
   }
diff --git a/mbti_parser/mbti_parser.mbt.map.json b/mbti_parser/mbti_parser.mbt.map.json
index 116989ea..59b8e39f 100644
--- a/mbti_parser/mbti_parser.mbt.map.json
+++ b/mbti_parser/mbti_parser.mbt.map.json
@@ -2,3584 +2,5660 @@
   "mappings": [
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 2710,
-      "generated_offset": 9519,
+      "original_offset": 2777,
+      "generated_offset": 9575,
       "length": 22
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 2734,
-      "generated_offset": 9549,
+      "original_offset": 2801,
+      "generated_offset": 9605,
       "length": 11
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 2747,
-      "generated_offset": 9568,
+      "original_offset": 2814,
+      "generated_offset": 9624,
       "length": 8
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 2757,
-      "generated_offset": 9584,
-      "length": 2
+      "original_offset": 2824,
+      "generated_offset": 9640,
+      "length": 15
+    },
+    {
+      "source": "mbti_parser.mbty",
+      "original_offset": 2844,
+      "generated_offset": 9684,
+      "length": 3
     },
     {
       "source": "mbti_parser.mbty",
       "original_offset": 115,
-      "generated_offset": 9778,
+      "generated_offset": 9879,
       "length": 6
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 2710,
-      "generated_offset": 10309,
+      "original_offset": 2777,
+      "generated_offset": 10589,
       "length": 22
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 2734,
-      "generated_offset": 10339,
+      "original_offset": 2801,
+      "generated_offset": 10619,
       "length": 11
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 2747,
-      "generated_offset": 10358,
+      "original_offset": 2814,
+      "generated_offset": 10638,
       "length": 8
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 2757,
-      "generated_offset": 10374,
-      "length": 2
+      "original_offset": 2824,
+      "generated_offset": 10654,
+      "length": 15
+    },
+    {
+      "source": "mbti_parser.mbty",
+      "original_offset": 2844,
+      "generated_offset": 10698,
+      "length": 3
     },
     {
       "source": "mbti_parser.mbty",
       "original_offset": 130,
-      "generated_offset": 10618,
+      "generated_offset": 10943,
       "length": 6
     },
     {
       "source": "mbti_parser.mbty",
       "original_offset": 138,
-      "generated_offset": 10632,
+      "generated_offset": 10957,
       "length": 2
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 3199,
-      "generated_offset": 11072,
+      "original_offset": 3287,
+      "generated_offset": 11397,
       "length": 1
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 3202,
-      "generated_offset": 11081,
+      "original_offset": 3290,
+      "generated_offset": 11406,
       "length": 6
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 3210,
-      "generated_offset": 11095,
+      "original_offset": 3298,
+      "generated_offset": 11420,
       "length": 9
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 3227,
-      "generated_offset": 11144,
+      "original_offset": 3315,
+      "generated_offset": 11469,
       "length": 4
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 3140,
-      "generated_offset": 11598,
+      "original_offset": 3228,
+      "generated_offset": 11923,
       "length": 18
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 3160,
-      "generated_offset": 11624,
+      "original_offset": 3248,
+      "generated_offset": 11949,
       "length": 9
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 3174,
-      "generated_offset": 11662,
+      "original_offset": 3262,
+      "generated_offset": 11987,
       "length": 4
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 3264,
-      "generated_offset": 11915,
+      "original_offset": 3352,
+      "generated_offset": 12240,
       "length": 6
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 3272,
-      "generated_offset": 11929,
+      "original_offset": 3360,
+      "generated_offset": 12254,
       "length": 2
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 3290,
-      "generated_offset": 12180,
+      "original_offset": 3378,
+      "generated_offset": 12505,
       "length": 6
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 3298,
-      "generated_offset": 12194,
+      "original_offset": 3386,
+      "generated_offset": 12519,
       "length": 2
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 3317,
-      "generated_offset": 12448,
+      "original_offset": 3405,
+      "generated_offset": 12773,
       "length": 7
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 3326,
-      "generated_offset": 12463,
+      "original_offset": 3414,
+      "generated_offset": 12788,
       "length": 2
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 3345,
-      "generated_offset": 12717,
+      "original_offset": 3433,
+      "generated_offset": 13042,
       "length": 7
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 3354,
-      "generated_offset": 12732,
+      "original_offset": 3442,
+      "generated_offset": 13057,
       "length": 2
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 3372,
-      "generated_offset": 12984,
+      "original_offset": 3460,
+      "generated_offset": 13309,
       "length": 6
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 3380,
-      "generated_offset": 12998,
+      "original_offset": 3468,
+      "generated_offset": 13323,
       "length": 2
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 3399,
-      "generated_offset": 13253,
+      "original_offset": 3487,
+      "generated_offset": 13578,
       "length": 7
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 3408,
-      "generated_offset": 13268,
+      "original_offset": 3496,
+      "generated_offset": 13593,
       "length": 2
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 3427,
-      "generated_offset": 13523,
+      "original_offset": 3515,
+      "generated_offset": 13848,
       "length": 7
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 3436,
-      "generated_offset": 13538,
+      "original_offset": 3524,
+      "generated_offset": 13863,
       "length": 2
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 3510,
-      "generated_offset": 13945,
+      "original_offset": 3613,
+      "generated_offset": 14496,
       "length": 18
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 3530,
-      "generated_offset": 13971,
+      "original_offset": 3633,
+      "generated_offset": 14522,
       "length": 9
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 3541,
-      "generated_offset": 13988,
+      "original_offset": 3644,
+      "generated_offset": 14539,
       "length": 9
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 3552,
-      "generated_offset": 14005,
-      "length": 2
+      "original_offset": 3655,
+      "generated_offset": 14556,
+      "length": 9
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 10591,
-      "generated_offset": 14214,
-      "length": 12
+      "original_offset": 3666,
+      "generated_offset": 14573,
+      "length": 2
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 10616,
-      "generated_offset": 14435,
-      "length": 13
+      "original_offset": 3613,
+      "generated_offset": 15206,
+      "length": 18
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 10641,
-      "generated_offset": 14703,
-      "length": 6
+      "original_offset": 3633,
+      "generated_offset": 15232,
+      "length": 9
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 10649,
-      "generated_offset": 14717,
-      "length": 2
+      "original_offset": 3644,
+      "generated_offset": 15249,
+      "length": 9
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 10664,
-      "generated_offset": 14978,
-      "length": 7
+      "original_offset": 3655,
+      "generated_offset": 15266,
+      "length": 9
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 10673,
-      "generated_offset": 14993,
+      "original_offset": 3666,
+      "generated_offset": 15283,
       "length": 2
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 10687,
-      "generated_offset": 15250,
-      "length": 6
+      "original_offset": 3740,
+      "generated_offset": 15845,
+      "length": 20
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 10695,
-      "generated_offset": 15264,
-      "length": 2
+      "original_offset": 3762,
+      "generated_offset": 15873,
+      "length": 8
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 10708,
-      "generated_offset": 15796,
-      "length": 11
+      "original_offset": 3772,
+      "generated_offset": 15889,
+      "length": 9
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 10721,
-      "generated_offset": 15815,
-      "length": 222
+      "original_offset": 3783,
+      "generated_offset": 15906,
+      "length": 3
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 10956,
-      "generated_offset": 16289,
-      "length": 7
+      "original_offset": 6837,
+      "generated_offset": 16633,
+      "length": 23
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 10965,
-      "generated_offset": 16304,
-      "length": 2
+      "original_offset": 6862,
+      "generated_offset": 16664,
+      "length": 6
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 10981,
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-      "length": 8
+      "original_offset": 6870,
+      "generated_offset": 16678,
+      "length": 7
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 10991,
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-      "length": 2
+      "original_offset": 6879,
+      "generated_offset": 16693,
+      "length": 16
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 11007,
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-      "length": 8
+      "original_offset": 6897,
+      "generated_offset": 16717,
+      "length": 10
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 11017,
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-      "length": 2
+      "original_offset": 6909,
+      "generated_offset": 16735,
+      "length": 5
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 3622,
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+      "original_offset": 4792,
+      "generated_offset": 17424,
+      "length": 23
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 3642,
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+      "original_offset": 4817,
+      "generated_offset": 17455,
+      "length": 7
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 3653,
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-      "length": 2
+      "original_offset": 4826,
+      "generated_offset": 17470,
+      "length": 8
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 3622,
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-      "length": 18
+      "original_offset": 4836,
+      "generated_offset": 17486,
+      "length": 17
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 3642,
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-      "length": 9
+      "original_offset": 4855,
+      "generated_offset": 17511,
+      "length": 29
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 3653,
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-      "length": 2
+      "original_offset": 4938,
+      "generated_offset": 18408,
+      "length": 56
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 4052,
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-      "length": 1
+      "original_offset": 4996,
+      "generated_offset": 18472,
+      "length": 91
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 4055,
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-      "length": 1
+      "original_offset": 5089,
+      "generated_offset": 18571,
+      "length": 7
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 3722,
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+      "original_offset": 5098,
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     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 3730,
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+      "original_offset": 5108,
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     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 3903,
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     },
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       "source": "mbti_parser.mbty",
-      "original_offset": 3949,
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+      "original_offset": 5295,
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     },
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+      "original_offset": 5305,
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     },
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     },
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     },
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       "source": "mbti_parser.mbty",
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     },
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     },
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       "source": "mbti_parser.mbty",
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+      "original_offset": 5537,
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     {
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+      "original_offset": 5660,
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-      "original_offset": 10315,
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-      "original_offset": 11954,
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+      "original_offset": 1075,
+      "generated_offset": 150817,
+      "length": 5
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 11900,
-      "generated_offset": 96349,
-      "length": 3
+      "original_offset": 1082,
+      "generated_offset": 150830,
+      "length": 2
+    },
+    {
+      "source": "mbti_parser.mbty",
+      "original_offset": 1006,
+      "generated_offset": 151111,
+      "length": 17
+    },
+    {
+      "source": "mbti_parser.mbty",
+      "original_offset": 1025,
+      "generated_offset": 151136,
+      "length": 2
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 11414,
-      "generated_offset": 96817,
+      "original_offset": 12950,
+      "generated_offset": 151603,
       "length": 35
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 11451,
-      "generated_offset": 96860,
+      "original_offset": 12987,
+      "generated_offset": 151646,
       "length": 15
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 11471,
-      "generated_offset": 96904,
+      "original_offset": 13007,
+      "generated_offset": 151690,
       "length": 3
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 11505,
-      "generated_offset": 97438,
+      "original_offset": 13041,
+      "generated_offset": 152224,
       "length": 32
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 11539,
-      "generated_offset": 97478,
+      "original_offset": 13075,
+      "generated_offset": 152264,
       "length": 5
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 11546,
-      "generated_offset": 97491,
+      "original_offset": 13082,
+      "generated_offset": 152277,
       "length": 15
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 11566,
-      "generated_offset": 97535,
+      "original_offset": 13102,
+      "generated_offset": 152321,
       "length": 3
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 807,
-      "generated_offset": 97944,
+      "original_offset": 1072,
+      "generated_offset": 152692,
       "length": 1
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 810,
-      "generated_offset": 97953,
+      "original_offset": 1075,
+      "generated_offset": 152701,
       "length": 5
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 817,
-      "generated_offset": 97966,
+      "original_offset": 1082,
+      "generated_offset": 152714,
       "length": 2
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 807,
-      "generated_offset": 98381,
+      "original_offset": 1006,
+      "generated_offset": 152993,
+      "length": 17
+    },
+    {
+      "source": "mbti_parser.mbty",
+      "original_offset": 1025,
+      "generated_offset": 153018,
+      "length": 2
+    },
+    {
+      "source": "mbti_parser.mbty",
+      "original_offset": 223,
+      "generated_offset": 153368,
       "length": 1
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 810,
-      "generated_offset": 98390,
-      "length": 5
+      "original_offset": 226,
+      "generated_offset": 153377,
+      "length": 1
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 817,
-      "generated_offset": 98403,
-      "length": 2
+      "original_offset": 495,
+      "generated_offset": 153652,
+      "length": 1
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 760,
-      "generated_offset": 98750,
-      "length": 17
+      "original_offset": 498,
+      "generated_offset": 153661,
+      "length": 1
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 779,
-      "generated_offset": 98775,
+      "original_offset": 199,
+      "generated_offset": 153879,
+      "length": 15
+    },
+    {
+      "source": "mbti_parser.mbty",
+      "original_offset": 6573,
+      "generated_offset": 154536,
+      "length": 25
+    },
+    {
+      "source": "mbti_parser.mbty",
+      "original_offset": 6600,
+      "generated_offset": 154569,
+      "length": 7
+    },
+    {
+      "source": "mbti_parser.mbty",
+      "original_offset": 6609,
+      "generated_offset": 154584,
+      "length": 8
+    },
+    {
+      "source": "mbti_parser.mbty",
+      "original_offset": 6619,
+      "generated_offset": 154600,
+      "length": 59
+    },
+    {
+      "source": "mbti_parser.mbty",
+      "original_offset": 6961,
+      "generated_offset": 155176,
+      "length": 23
+    },
+    {
+      "source": "mbti_parser.mbty",
+      "original_offset": 6986,
+      "generated_offset": 155207,
+      "length": 6
+    },
+    {
+      "source": "mbti_parser.mbty",
+      "original_offset": 6994,
+      "generated_offset": 155221,
+      "length": 12
+    },
+    {
+      "source": "mbti_parser.mbty",
+      "original_offset": 7008,
+      "generated_offset": 155241,
+      "length": 4
+    },
+    {
+      "source": "mbti_parser.mbty",
+      "original_offset": 13401,
+      "generated_offset": 155679,
+      "length": 14
+    },
+    {
+      "source": "mbti_parser.mbty",
+      "original_offset": 13417,
+      "generated_offset": 155701,
+      "length": 14
+    },
+    {
+      "source": "mbti_parser.mbty",
+      "original_offset": 13436,
+      "generated_offset": 155744,
+      "length": 3
+    },
+    {
+      "source": "mbti_parser.mbty",
+      "original_offset": 7090,
+      "generated_offset": 156564,
+      "length": 30
+    },
+    {
+      "source": "mbti_parser.mbty",
+      "original_offset": 7122,
+      "generated_offset": 156602,
+      "length": 15
+    },
+    {
+      "source": "mbti_parser.mbty",
+      "original_offset": 7145,
+      "generated_offset": 156657,
+      "length": 29
+    },
+    {
+      "source": "mbti_parser.mbty",
+      "original_offset": 7176,
+      "generated_offset": 156694,
+      "length": 9
+    },
+    {
+      "source": "mbti_parser.mbty",
+      "original_offset": 7187,
+      "generated_offset": 156711,
+      "length": 23
+    },
+    {
+      "source": "mbti_parser.mbty",
+      "original_offset": 7212,
+      "generated_offset": 156742,
+      "length": 4
+    },
+    {
+      "source": "mbti_parser.mbty",
+      "original_offset": 6737,
+      "generated_offset": 156999,
+      "length": 6
+    },
+    {
+      "source": "mbti_parser.mbty",
+      "original_offset": 6745,
+      "generated_offset": 157013,
       "length": 2
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 12220,
-      "generated_offset": 99246,
-      "length": 27
+      "original_offset": 7295,
+      "generated_offset": 157834,
+      "length": 30
+    },
+    {
+      "source": "mbti_parser.mbty",
+      "original_offset": 7327,
+      "generated_offset": 157872,
+      "length": 15
+    },
+    {
+      "source": "mbti_parser.mbty",
+      "original_offset": 7350,
+      "generated_offset": 157927,
+      "length": 29
+    },
+    {
+      "source": "mbti_parser.mbty",
+      "original_offset": 7381,
+      "generated_offset": 157964,
+      "length": 9
+    },
+    {
+      "source": "mbti_parser.mbty",
+      "original_offset": 7392,
+      "generated_offset": 157981,
+      "length": 24
+    },
+    {
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+      "original_offset": 7418,
+      "generated_offset": 158013,
+      "length": 4
+    },
+    {
+      "source": "mbti_parser.mbty",
+      "original_offset": 12593,
+      "generated_offset": 158218,
+      "length": 9
+    },
+    {
+      "source": "mbti_parser.mbty",
+      "original_offset": 13651,
+      "generated_offset": 158447,
+      "length": 16
+    },
+    {
+      "source": "mbti_parser.mbty",
+      "original_offset": 6712,
+      "generated_offset": 158657,
+      "length": 6
+    },
+    {
+      "source": "mbti_parser.mbty",
+      "original_offset": 13329,
+      "generated_offset": 159097,
+      "length": 14
+    },
+    {
+      "source": "mbti_parser.mbty",
+      "original_offset": 13345,
+      "generated_offset": 159119,
+      "length": 14
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 12252,
-      "generated_offset": 99302,
+      "original_offset": 13364,
+      "generated_offset": 159162,
       "length": 3
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 12257,
-      "generated_offset": 99313,
+      "original_offset": 807,
+      "generated_offset": 159578,
+      "length": 1
+    },
+    {
+      "source": "mbti_parser.mbty",
+      "original_offset": 810,
+      "generated_offset": 159587,
+      "length": 5
+    },
+    {
+      "source": "mbti_parser.mbty",
+      "original_offset": 817,
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       "length": 2
     },
     {
       "source": "mbti_parser.mbty",
       "original_offset": 760,
-      "generated_offset": 99630,
+      "generated_offset": 159947,
       "length": 17
     },
     {
       "source": "mbti_parser.mbty",
       "original_offset": 779,
-      "generated_offset": 99655,
+      "generated_offset": 159972,
+      "length": 2
+    },
+    {
+      "source": "mbti_parser.mbty",
+      "original_offset": 13756,
+      "generated_offset": 160443,
+      "length": 27
+    },
+    {
+      "source": "mbti_parser.mbty",
+      "original_offset": 13788,
+      "generated_offset": 160499,
+      "length": 3
+    },
+    {
+      "source": "mbti_parser.mbty",
+      "original_offset": 13793,
+      "generated_offset": 160510,
       "length": 2
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 3113,
-      "generated_offset": 99883,
+      "original_offset": 3201,
+      "generated_offset": 160738,
       "length": 15
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 2897,
-      "generated_offset": 100240,
+      "original_offset": 2985,
+      "generated_offset": 161095,
       "length": 1
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 2900,
-      "generated_offset": 100249,
+      "original_offset": 2988,
+      "generated_offset": 161104,
       "length": 1
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 3019,
-      "generated_offset": 100607,
+      "original_offset": 3107,
+      "generated_offset": 161462,
       "length": 23
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 3044,
-      "generated_offset": 100638,
+      "original_offset": 3132,
+      "generated_offset": 161493,
       "length": 15
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 3061,
-      "generated_offset": 100661,
+      "original_offset": 3149,
+      "generated_offset": 161516,
       "length": 3
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 2952,
-      "generated_offset": 100960,
+      "original_offset": 3040,
+      "generated_offset": 161815,
       "length": 23
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 2977,
-      "generated_offset": 100991,
+      "original_offset": 3065,
+      "generated_offset": 161846,
       "length": 16
     },
     {
       "source": "mbti_parser.mbty",
       "original_offset": 1072,
-      "generated_offset": 101375,
+      "generated_offset": 162230,
       "length": 1
     },
     {
       "source": "mbti_parser.mbty",
       "original_offset": 1075,
-      "generated_offset": 101384,
+      "generated_offset": 162239,
       "length": 5
     },
     {
       "source": "mbti_parser.mbty",
       "original_offset": 1082,
-      "generated_offset": 101397,
+      "generated_offset": 162252,
       "length": 2
     },
     {
       "source": "mbti_parser.mbty",
       "original_offset": 1006,
-      "generated_offset": 101676,
+      "generated_offset": 162531,
       "length": 17
     },
     {
       "source": "mbti_parser.mbty",
       "original_offset": 1025,
-      "generated_offset": 101701,
+      "generated_offset": 162556,
       "length": 2
     },
     {
       "source": "mbti_parser.mbty",
-      "original_offset": 2809,
-      "generated_offset": 101927,
+      "original_offset": 2897,
+      "generated_offset": 162782,
       "length": 15
     }
   ]
diff --git a/mbti_parser/mbti_parser.mbty b/mbti_parser/mbti_parser.mbty
index 9835bd95..50dd16d1 100644
--- a/mbti_parser/mbti_parser.mbty
+++ b/mbti_parser/mbti_parser.mbty
@@ -109,22 +109,24 @@
 %token USING "using"
 %token DECLARE         "declare"
 %token NORAISE "noraise"
+%token NOBREAK         "nobreak"
 %token WHERE           "where"
 %token ENUMVIEW "enumview"
 %token TRY_QUESTION    "try?"
 %token TRY_EXCLAMATION "try!"
 %token LEXMATCH        "lexmatch"
 %token LEXMATCH_QUESTION "lexmatch?"
+%token PACKAGE         "package"
 
 %%
 
 mbti -> Mbti
-  : LIDENT STRING ioption(";") imports sigs EOF { Mbti::{package_name: $2, imports: $4, sigs: $5} }
+  : PACKAGE STRING ioption(";") imports sigs EOF { Mbti::{package_name: $2, imports: $4, sigs: $5, loc : mk_loc($sloc)} }
   ;
 
 imports -> @list.List[PackageImport]
   :  { @list.empty() }
-  | "import" "(" separated_nonempty_list(";", package_import) ")" ";" { $3 }
+  | "import" "{" separated_nonempty_list(",", package_import) "}" ";" { $3 }
   ;
 
 package_import -> PackageImport
@@ -149,29 +151,37 @@ sig_ -> Sig
   ;
 
 const_sig -> ConstSig
-  : "const" uident ":" type_ "=" constant { ConstSig::{name: $2, type_: $4, value: $6} }
+  : attributes vis "const" uident ":" type_ "=" constant { ConstSig::{name: $4, type_: $6, value: $8, attrs: $1} }
   ;
 
 value_sig -> ValueSig
-  : attributes "let" lident ":" type_ { ValueSig::{name: $3, type_: $5} }
+  : attributes vis "let" lident ":" type_ { ValueSig::{ attrs: $1, name: $4, type_: $6 } }
   ;
 
+method_self_type_coloncolon -> MethodSelfType 
+ : UIDENT "::" {
+  MethodSelfType::{ name : $1, is_object : false, loc : mk_loc($loc($1)) }
+ }
+ | "&" UIDENT "::" {
+  MethodSelfType::{ name : $2, is_object : true, loc : mk_loc($loc($1)) }
+ }
+
 method_prefix -> Option[Name]
   : { None }
   | uident "::" { Some($1) }
   ;
 
-func_sig_no_attr -> FuncSig
-  : FN loption(type_params_with_constraints) method_prefix lident delimited("(", separated_list(",", parameter), ")") "->" return_type { FuncSig::{ attr: @list.empty(), type_name: $3, name: $4, type_params: $2, params: $5, return_: $7} }
-  ;
 
 func_sig -> FuncSig
-  : func_sig_no_attr { $1 }
-  | nonempty_list(ATTRIBUTE) func_sig_no_attr { { ..$2, attr : $1 } }
+  : attributes is_async FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident delimited("(", separated_list(",", parameter), ")") "->" return_type {
+    FuncSig::{ attrs: $1, is_async : $2, type_name: $5, name: $6, type_params: $4, params: $7, return_: $9}
+  }
   ;
 
 trait_method_sig -> TraitMethodSig
-  : lident delimited("(", separated_list(",", trait_method_parameter), ")") "->" return_type boption(eq_underscore) { TraitMethodSig::{name: $1, params: $2, return_: $4, has_default: $5} }
+  : attributes lident delimited("(", separated_list(",", parameter), ")") "->" return_type boption(eq_underscore) { 
+    TraitMethodSig::{ attrs : $1, name: $2, params: $3, return_: $5, has_default: $6} 
+  }
   ;
 
 %inline eq_underscore
@@ -179,32 +189,67 @@ trait_method_sig -> TraitMethodSig
   ;
 
 type_sig -> TypeSig
-  : vis "extern" "type" type_decl_name_with_params { TypeSig::{vis: $1, name: $4.0, type_params: $4.1, components: Extern} }
-  | vis "type" type_decl_name_with_params { TypeSig::{vis: $1, name: $3.0, type_params: $3.1, components: Abstract} }
-  | vis "type" type_decl_name_with_params type_ { TypeSig::{vis: $1, name: $3.0, type_params: $3.1, components: Newtype($4)} }
-  | vis "suberror" uident { TypeSig::{vis: $1, name: $3, type_params: @list.empty(), components: Error(NoPayload)} }
-  | vis "suberror" uident type_ { TypeSig::{vis: $1, name: $3, type_params: @list.empty(), components: Error(SinglePayload($4))} }
-  | vis "suberror" uident "{" separated_list(";", enum_constructor) "}" { TypeSig::{vis: $1, name: $3, type_params: @list.empty(), components: Error(EnumPayload($5))} }
-  | vis "struct" type_decl_name_with_params "{" separated_list(";", record_decl_field) "}" { TypeSig::{vis: $1, name: $3.0, type_params: $3.1, components: Record($5)} }
-  | vis "struct" type_decl_name_with_params "(" separated_list(",", type_) ")" { TypeSig::{vis: $1, name: $3.0, type_params: $3.1, components: TupleStruct($5)} }
-  | vis "enum" type_decl_name_with_params "{" separated_list(";", enum_constructor) "}" { TypeSig::{vis: $1, name: $3.0, type_params: $3.1, components: Variant($5)} }
+  : attributes vis "type" type_decl_name_with_params {
+    TypeSig::{attrs : $1, vis: $2, name: $4.0, type_params: $4.1, components: Abstract} 
+  }
+  | attributes vis "suberror" uident option(type_) {
+    let exception_decl : @syntax.ExceptionDecl = match $5 {
+      None => NoPayload
+      Some(ty) => SinglePayload(ty)
+    }
+    TypeSig::{attrs : $1, vis: $2, name: $4, type_params: @list.empty(), components: Error(exception_decl)}
+  }
+  | attributes vis "suberror" uident "{" separated_list(";", enum_constructor) "}" {
+    TypeSig::{attrs : $1, vis: $2, name: $4, type_params: @list.empty(), components: Error(EnumPayload($6))}
+  }
+  | attributes vis "struct" type_decl_name_with_params "{" record_decl_body "}" {
+    TypeSig::{attrs : $1, vis: $2, name: $4.0, type_params: $4.1, components: $6 }
+  }
+  | attributes vis "struct" type_decl_name_with_params "(" separated_list(",", type_) ")" {
+    TypeSig::{attrs : $1, vis: $2, name: $4.0, type_params: $4.1, components: TupleStruct($6)}
+  }
+  | attributes vis "enum" type_decl_name_with_params "{" separated_list(";", enum_constructor) "}" {
+    TypeSig::{attrs : $1, vis: $2, name: $4.0, type_params: $4.1, components: Variant($6)}
+  }
   ;
 
 impl_sig -> ImplSig
-  : "impl" type_params_with_constraints qualified_uident "for" type_ { Trait(type_params=$2, trait_name=$3, type_=$5) }
-  | "impl" qualified_uident "for" type_ { Trait(type_params=@list.empty(), trait_name=$2, type_=$4) }
-  | "impl" uident "::" lident { DefaultImpl(trait_name=$2, method_name=$4) }
+  : attributes vis "impl" type_params_with_constraints qualified_uident "for" type_ {
+    ImplSig::{type_params : $4, trait_name : $5, type_ : $7, attrs : $1}
+  }
+  | attributes vis "impl" qualified_uident "for" type_ { 
+    ImplSig::{type_params : @list.empty(), trait_name : $4, type_ : $6, attrs : $1}
+  }
   ;
 
 trait_sig -> TraitSig
-  : vis "trait" uident loption(preceded(":", separated_nonempty_list("+", qualified_uident))) "{" separated_nonempty_list(";", trait_method_sig) "}" { TraitSig::{vis: $1, name: $3, super_traits: $4, methods: $6} }
-  | vis "trait" uident { TraitSig::{vis: $1, name: $3, super_traits: @list.empty(), methods: @list.empty()} }
+  : attributes vis "trait" uident loption(preceded(":", separated_nonempty_list("+", qualified_uident))) "{" separated_nonempty_list(";", trait_method_sig) "}" { 
+    TraitSig::{ attrs : $1, vis: $2, name: $4, super_traits: $5, methods: $7} 
+  }
+  | attributes vis "trait" uident {
+    TraitSig::{ attrs : $1, vis: $2, name: $4, super_traits: @list.empty(), methods: @list.empty() } 
+  }
   ;
 
+using_binder -> Name?
+  : { None }
+  | "as" uident { Some($2) }
+
 alias_sig -> AliasSig
-  : vis "typealias" type_ "as" type_decl_name_with_params  { TypeAlias(vis=$1, name=$5.0, type_params=$5.1, type_=$3) }
-  | vis "traitalias" qualified_uident "as" uident { TraitAlias(vis=$1, name=$5, trait_name=$3) }
-  | "fnalias" qualified_uident "::" lident { FnAlias(name=$4, type_name=$2, loc=mk_loc($sloc)) }
+  : attributes vis "type"  type_decl_name_with_params "=" type_ {
+    TypeAlias(attrs = $1, vis=$2, name=$4.0, type_params=$4.1, type_=$6) 
+  }
+  | attributes "fnalias" uident "::" lident {
+    FuncAlias(attrs = $1,name=$5, type_name=$3)
+  }
+  | attributes vis "using" PACKAGE_NAME "{" "type" uident using_binder "}" {
+    let pkg = Name::{ name : $4, loc : mk_loc($loc($4)) }
+    Using(pkg~, target = $7, name = $8, kind = Type, attrs = $1)
+  }
+  | attributes vis "using" PACKAGE_NAME "{" "trait" uident using_binder "}" {
+    let pkg = Name::{ name : $4, loc : mk_loc($loc($4)) }
+    Using(pkg~, target = $7, name = $8, kind = Trait, attrs = $1)
+  }
   ;
 
 enum_constructor -> ConstrDecl
@@ -228,6 +273,37 @@ record_decl_field -> FieldDecl
   }
   ;
 
+record_decl_constr -> FuncSig
+  : attributes is_async FN loption(type_params_with_constraints) option(method_self_type_coloncolon) lident delimited("(", separated_list(",", parameter), ")") "->" return_type {
+    FuncSig::{
+      attrs : $1, is_async : $2, type_name: $5, name: $6, type_params: $4, params: $7, return_: $9
+    }
+  }
+
+record_decl_body -> TypeDefinition
+  : {
+    Record(fields = @list.empty(), constr = None)
+  }
+  | record_decl_constr {
+    Record(fields = @list.empty(), constr = Some($1))
+  }
+  | record_decl_body_nonempty {
+    let (fields, constr) = $1
+    Record(fields~, constr~)
+  }
+
+record_decl_body_nonempty -> (@list.List[FieldDecl], FuncSig?)
+  : record_decl_field ";" record_decl_constr {
+    (@list.singleton($1), Some($3))
+  }
+  | record_decl_field {
+    (@list.singleton($1), None)
+  }
+  | record_decl_field ";" record_decl_body_nonempty {
+    let (fields, constr) = $3
+    (fields.add($1), constr)
+  }
+
 type_param_with_constraints -> TypeParamWithConstraints
   : uident { TypeParamWithConstraints::{name: $1, constraints: @list.empty()} }
   | uident ":" separated_nonempty_list("+", type_constraint) { TypeParamWithConstraints::{name: $1, constraints: $3} }
@@ -295,16 +371,9 @@ optional_type_arguments -> @list.List[Type]
   ;
 
 parameter -> Parameter
-  : type_ { Positional($1) }
-  | post_label ":" type_ { Labelled($1, $3) }
-  | post_label ":" type_ "=" ".." { OptionalDefault($1, $3) }
-  | post_label ":" type_ "=" "_" { Autofill($1, $3) }
-  | label "?" ":" type_ { OptionalOption($1, $4) }
-  ;
-
-trait_method_parameter -> TraitMethodParameter
-  : type_ { Positional($1) }
-  | post_label ":" type_ { Labelled($1, $3) }
+  : type_ { DiscardPositional(ty = Some($1), loc = mk_loc($loc($1))) }
+  | post_label ":" type_ { Labelled(binder = { name : $1.name, loc : $1.loc }, ty = Some($3)) }
+  | label "?" ":" type_ { QuestionOptional(binder = { name : $1.name, loc : $1.loc }, ty = Some($4)) }
   ;
 
 constant -> Constant
diff --git a/moon.mod.json b/moon.mod.json
index cfa87e7f..c6136b81 100644
--- a/moon.mod.json
+++ b/moon.mod.json
@@ -16,5 +16,6 @@
     "AST",
     "MoonBit"
   ],
-  "description": "AST and parsers for the MoonBit programming language"
+  "description": "AST and parsers for the MoonBit programming language",
+  "exclude" : ["test"]
 }
diff --git a/syntax/ast.mbt b/syntax/ast.mbt
index cd0ce39f..e3a8a890 100644
--- a/syntax/ast.mbt
+++ b/syntax/ast.mbt
@@ -145,7 +145,7 @@ pub(all) enum TypeDesc {
   /// `enum T { C1; C2 }`
   Variant(@list.List[ConstrDecl])
   /// `struct T { field1: T1; field2: T2 }`
-  Record(@list.List[FieldDecl])
+  Record(fields~ : @list.List[FieldDecl], constr_decl~ : FunDecl?)
   /// `struct T (T1,T2)`
   TupleStruct(@list.List[Type])
   Alias(Type)
@@ -370,6 +370,7 @@ pub(all) enum LexTopPattern {
 pub(all) struct LexCase {
   pat : @list.List[LexTopPattern]
   pat_loc : Location
+  guard_ : Expr?
   body : Expr
 }
 
@@ -766,6 +767,7 @@ pub(all) struct FunDecl {
   vis : Visibility
   attrs : @list.List[Attribute]
   mut doc : DocString
+  loc : Location
 }
 
 ///|
diff --git a/syntax/ast_json_repr.mbt b/syntax/ast_json_repr.mbt
index 97c143b3..d98771d5 100644
--- a/syntax/ast_json_repr.mbt
+++ b/syntax/ast_json_repr.mbt
@@ -181,16 +181,31 @@ pub fn TypeDesc::json_repr(self : TypeDesc, loc : Location) -> Json {
         ),
       )
     }
-    Record(fields) =>
-      tagged_node1(
+    Record(fields~, constr_decl~) =>
+      tagged_node(
         "TypeDesc::Record",
         loc,
-        list_json_repr(
-          "TypeDesc::Record::FieldList",
-          loc,
-          fields,
-          FieldDecl::json_repr,
-        ),
+        match constr_decl {
+          None =>
+            {
+              "value": list_json_repr(
+                "TypeDesc::Record::FieldList",
+                loc,
+                fields,
+                FieldDecl::json_repr,
+              ),
+            }
+          Some(constr_decl) =>
+            {
+              "value": list_json_repr(
+                "TypeDesc::Record::FieldList",
+                loc,
+                fields,
+                FieldDecl::json_repr,
+              ),
+              "constr_decl": constr_decl.json_repr(),
+            }
+        },
       )
     TupleStruct(tys) => {
       let tys_loc = match tys {
@@ -887,8 +902,8 @@ pub fn TypeDecl::json_repr(self : TypeDecl) -> Json {
 }
 
 ///|
-pub fn FunDecl::json_repr(self : FunDecl, loc : Location) -> Json {
-  tagged_node("FunDecl", loc, {
+pub fn FunDecl::json_repr(self : FunDecl) -> Json {
+  tagged_node("FunDecl", self.loc, {
     "type_name": option_json_repr(self.type_name, TypeName::json_repr),
     "name": self.name.json_repr(),
     "has_error": option_json_repr(self.has_error, raise_json_repr),
@@ -908,7 +923,7 @@ pub fn FunDecl::json_repr(self : FunDecl, loc : Location) -> Json {
       TypeVarBinder::json_repr,
     ),
     "return_type": option_json_repr(self.return_type, Type::json_repr),
-    "error_type": self.error_type.json_repr(loc),
+    "error_type": self.error_type.json_repr(self.loc),
     "vis": self.vis.json_repr(self.params_loc),
     "attrs": list_json_repr(
       "FunDecl::AttrList",
@@ -1506,6 +1521,7 @@ pub fn LexCase::json_repr(self : LexCase, loc : Location) -> Json {
     ) {
       ltp.json_repr(self.pat_loc)
     }),
+    "guard": option_json_repr(self.guard_, Expr::json_repr),
     "body": self.body.json_repr(),
   })
 }
@@ -1635,7 +1651,7 @@ pub fn Impl::json_repr(self : Impl) -> Json {
       tagged_node1("Impl::TopTypeDef", type_decl.loc, type_decl.json_repr())
     TopFuncDef(fun_decl~, decl_body~, loc~) =>
       tagged_node("Impl::TopFuncDef", loc, {
-        "fun_decl": fun_decl.json_repr(loc),
+        "fun_decl": fun_decl.json_repr(),
         "decl_body": decl_body.json_repr(loc),
       })
     TopFuncAlias(pkg~, type_name~, targets~, vis~, attrs~, is_list~, doc~, loc~) =>
diff --git a/syntax/ast_test.mbt b/syntax/ast_test.mbt
index 5d4ce1ac..b5ac7015 100644
--- a/syntax/ast_test.mbt
+++ b/syntax/ast_test.mbt
@@ -3579,8 +3579,9 @@ test "fun_decl to_json" {
     vis: @syntax.Priv(loc=dummy_loc),
     attrs: @list.from_array([dummy_attribute]),
     doc: dummy_docstring,
+    loc: dummy_loc,
   }
-  json_inspect(fun_decl.json_repr(dummy_loc), content={
+  json_inspect(fun_decl.json_repr(), content={
     "kind": "FunDecl",
     "loc": null,
     "children": {
@@ -4106,6 +4107,7 @@ test "impl variants to_json" {
     vis: @syntax.Default,
     attrs: @list.from_array([]),
     doc: dummy_docstring,
+    loc: dummy_loc,
   }
   let decl_body = @syntax.DeclBody(
     local_types=@list.from_array([]),
diff --git a/syntax/iter_visitor.mbt b/syntax/iter_visitor.mbt
index b9d001f7..d8b0c64a 100644
--- a/syntax/iter_visitor.mbt
+++ b/syntax/iter_visitor.mbt
@@ -77,7 +77,11 @@ pub(open) trait IterVisitor {
   visit_TypeDesc_Newtype(Self, Type) -> Unit = _
   visit_TypeDesc_Error(Self, ExceptionDecl) -> Unit = _
   visit_TypeDesc_Variant(Self, @list.List[ConstrDecl]) -> Unit = _
-  visit_TypeDesc_Record(Self, @list.List[FieldDecl]) -> Unit = _
+  visit_TypeDesc_Record(
+    Self,
+    fields~ : @list.List[FieldDecl],
+    constr_decl~ : FunDecl?,
+  ) -> Unit = _
   visit_TypeDesc_TupleStruct(Self, @list.List[Type]) -> Unit = _
   visit_TypeDesc_Alias(Self, Type) -> Unit = _
 
@@ -1602,8 +1606,8 @@ impl IterVisitor with visit_TypeDesc_Variant(env, constr_decls) {
 }
 
 ///|
-impl IterVisitor with visit_TypeDesc_Record(env, field_decls) {
-  IterVisitorBase::visit_TypeDesc_Record(env, field_decls)
+impl IterVisitor with visit_TypeDesc_Record(env, fields~, constr_decl~) {
+  IterVisitorBase::visit_TypeDesc_Record(env, fields~, constr_decl~)
 }
 
 ///|
@@ -2662,7 +2666,8 @@ pub impl[T : IterVisitor] IterVisitor for IterVisitorBase[T] with visit_TypeDesc
     Newtype(type_) => env.0.visit_TypeDesc_Newtype(type_)
     Error(exception_decl) => env.0.visit_TypeDesc_Error(exception_decl)
     Variant(constr_decls) => env.0.visit_TypeDesc_Variant(constr_decls)
-    Record(field_decls) => env.0.visit_TypeDesc_Record(field_decls)
+    Record(fields~, constr_decl~) =>
+      env.0.visit_TypeDesc_Record(fields~, constr_decl~)
     TupleStruct(types) => env.0.visit_TypeDesc_TupleStruct(types)
     Alias(type_) => env.0.visit_TypeDesc_Alias(type_)
   }
@@ -2695,9 +2700,11 @@ pub impl[T : IterVisitor] IterVisitor for IterVisitorBase[T] with visit_TypeDesc
 ///|
 pub impl[T : IterVisitor] IterVisitor for IterVisitorBase[T] with visit_TypeDesc_Record(
   env,
-  field_decls,
+  fields~,
+  constr_decl~,
 ) {
-  field_decls.each(x => env.0.visit_FieldDecl(x))
+  fields.each(x => env.0.visit_FieldDecl(x))
+  constr_decl.each(x => env.0.visit_FunDecl(x))
 }
 
 ///|
@@ -4844,6 +4851,7 @@ pub impl[T : IterVisitor] IterVisitor for IterVisitorBase[T] with visit_LexCase(
   lex_case,
 ) {
   lex_case.pat.each(pat => env.0.visit_LexTopPattern(pat))
+  lex_case.guard_.each(guard_ => env.0.visit_Expr(guard_))
   env.0.visit_Expr(lex_case.body)
 }
 
diff --git a/syntax/map_visitor.mbt b/syntax/map_visitor.mbt
index 80606f6c..54d90abc 100644
--- a/syntax/map_visitor.mbt
+++ b/syntax/map_visitor.mbt
@@ -77,7 +77,11 @@ pub(open) trait MapVisitor {
   visit_TypeDesc_Newtype(Self, Type) -> TypeDesc = _
   visit_TypeDesc_Error(Self, ExceptionDecl) -> TypeDesc = _
   visit_TypeDesc_Variant(Self, @list.List[ConstrDecl]) -> TypeDesc = _
-  visit_TypeDesc_Record(Self, @list.List[FieldDecl]) -> TypeDesc = _
+  visit_TypeDesc_Record(
+    Self,
+    fields~ : @list.List[FieldDecl],
+    constr_decl~ : FunDecl?,
+  ) -> TypeDesc = _
   visit_TypeDesc_TupleStruct(Self, @list.List[Type]) -> TypeDesc = _
   visit_TypeDesc_Alias(Self, Type) -> TypeDesc = _
 
@@ -1602,8 +1606,8 @@ impl MapVisitor with visit_TypeDesc_Variant(env, constr_decls) {
 }
 
 ///|
-impl MapVisitor with visit_TypeDesc_Record(env, field_decls) {
-  MapVisitorBase::visit_TypeDesc_Record(env, field_decls)
+impl MapVisitor with visit_TypeDesc_Record(env, fields~, constr_decl~) {
+  MapVisitorBase::visit_TypeDesc_Record(env, fields~, constr_decl~)
 }
 
 ///|
@@ -2682,7 +2686,8 @@ pub impl[T : MapVisitor] MapVisitor for MapVisitorBase[T] with visit_TypeDesc(
     Newtype(type_) => env.0.visit_TypeDesc_Newtype(type_)
     Error(exception_decl) => env.0.visit_TypeDesc_Error(exception_decl)
     Variant(constr_decls) => env.0.visit_TypeDesc_Variant(constr_decls)
-    Record(field_decls) => env.0.visit_TypeDesc_Record(field_decls)
+    Record(fields~, constr_decl~) =>
+      env.0.visit_TypeDesc_Record(fields~, constr_decl~)
     TupleStruct(types) => env.0.visit_TypeDesc_TupleStruct(types)
     Alias(type_) => env.0.visit_TypeDesc_Alias(type_)
   }
@@ -2718,10 +2723,12 @@ pub impl[T : MapVisitor] MapVisitor for MapVisitorBase[T] with visit_TypeDesc_Va
 ///|
 pub impl[T : MapVisitor] MapVisitor for MapVisitorBase[T] with visit_TypeDesc_Record(
   env,
-  field_decls,
+  fields~,
+  constr_decl~,
 ) {
-  let field_decls = field_decls.map(x => env.0.visit_FieldDecl(x))
-  Record(field_decls)
+  let fields = fields.map(x => env.0.visit_FieldDecl(x))
+  let constr_decl = constr_decl.map(x => env.0.visit_FunDecl(x))
+  Record(fields~, constr_decl~)
 }
 
 ///|
@@ -3753,6 +3760,7 @@ pub impl[T : MapVisitor] MapVisitor for MapVisitorBase[T] with visit_FunDecl(
   let params_loc = fun_decl.params_loc
   let attrs = fun_decl.attrs
   let doc = fun_decl.doc
+  let loc = fun_decl.loc
   FunDecl::{
     type_name,
     name,
@@ -3766,6 +3774,7 @@ pub impl[T : MapVisitor] MapVisitor for MapVisitorBase[T] with visit_FunDecl(
     vis,
     attrs,
     doc,
+    loc,
   }
 }
 
@@ -4999,9 +5008,10 @@ pub impl[T : MapVisitor] MapVisitor for MapVisitorBase[T] with visit_LexCase(
   lex_case,
 ) {
   let pat = lex_case.pat.map(pat => env.0.visit_LexTopPattern(pat))
+  let guard_ = lex_case.guard_.map(guard_ => env.0.visit_Expr(guard_))
   let body = env.0.visit_Expr(lex_case.body)
   let pat_loc = lex_case.pat_loc
-  { pat, body, pat_loc }
+  { pat, pat_loc, guard_, body }
 }
 
 ///|
diff --git a/syntax/pkg.generated.mbti b/syntax/pkg.generated.mbti
index a39ffde0..218e1610 100644
--- a/syntax/pkg.generated.mbti
+++ b/syntax/pkg.generated.mbti
@@ -375,8 +375,9 @@ pub(all) struct FunDecl {
   vis : Visibility
   attrs : @list.List[@attribute.Attribute]
   mut doc : DocString
+  loc : @basic.Location
 }
-pub fn FunDecl::json_repr(Self, @basic.Location) -> Json
+pub fn FunDecl::json_repr(Self) -> Json
 
 pub(all) struct Func {
   parameters : @list.List[Parameter]
@@ -454,6 +455,7 @@ pub fn Label::json_repr(Self) -> Json
 pub(all) struct LexCase {
   pat : @list.List[LexTopPattern]
   pat_loc : @basic.Location
+  guard_ : Expr?
   body : Expr
 }
 pub fn LexCase::json_repr(Self, @basic.Location) -> Json
@@ -641,7 +643,7 @@ pub(all) enum TypeDesc {
   Newtype(Type)
   Error(ExceptionDecl)
   Variant(@list.List[ConstrDecl])
-  Record(@list.List[FieldDecl])
+  Record(fields~ : @list.List[FieldDecl], constr_decl~ : FunDecl?)
   TupleStruct(@list.List[Type])
   Alias(Type)
 }
@@ -736,7 +738,7 @@ pub(open) trait IterVisitor {
   visit_TypeDesc_Newtype(Self, Type) -> Unit = _
   visit_TypeDesc_Error(Self, ExceptionDecl) -> Unit = _
   visit_TypeDesc_Variant(Self, @list.List[ConstrDecl]) -> Unit = _
-  visit_TypeDesc_Record(Self, @list.List[FieldDecl]) -> Unit = _
+  visit_TypeDesc_Record(Self, fields~ : @list.List[FieldDecl], constr_decl~ : FunDecl?) -> Unit = _
   visit_TypeDesc_TupleStruct(Self, @list.List[Type]) -> Unit = _
   visit_TypeDesc_Alias(Self, Type) -> Unit = _
   visit_Hole(Self, Hole) -> Unit = _
@@ -949,7 +951,7 @@ pub(open) trait MapVisitor {
   visit_TypeDesc_Newtype(Self, Type) -> TypeDesc = _
   visit_TypeDesc_Error(Self, ExceptionDecl) -> TypeDesc = _
   visit_TypeDesc_Variant(Self, @list.List[ConstrDecl]) -> TypeDesc = _
-  visit_TypeDesc_Record(Self, @list.List[FieldDecl]) -> TypeDesc = _
+  visit_TypeDesc_Record(Self, fields~ : @list.List[FieldDecl], constr_decl~ : FunDecl?) -> TypeDesc = _
   visit_TypeDesc_TupleStruct(Self, @list.List[Type]) -> TypeDesc = _
   visit_TypeDesc_Alias(Self, Type) -> TypeDesc = _
   visit_Hole(Self, Hole) -> Hole = _
diff --git a/test/sync_test/__snapshot__/parse_test_async_fn.json b/test/sync_test/__snapshot__/parse_test_async_fn.json
deleted file mode 100644
index 02fc644a..00000000
--- a/test/sync_test/__snapshot__/parse_test_async_fn.json
+++ /dev/null
@@ -1,750 +0,0 @@
-[
-  {
-    "kind": "Impl::TopFuncDef",
-    "loc": null,
-    "children": {
-      "fun_decl": {
-        "kind": "FunDecl",
-        "loc": null,
-        "children": {
-          "type_name": null,
-          "name": {
-            "kind": "Binder",
-            "loc": null,
-            "children": {
-              "name": "f"
-            }
-          },
-          "has_error": null,
-          "is_async": {
-            "kind": "Async",
-            "loc": null,
-            "children": {}
-          },
-          "decl_params": {
-            "kind": "FunDecl::ParameterList",
-            "loc": null,
-            "children": [
-              {
-                "kind": "Parameter::Positional",
-                "loc": null,
-                "children": {
-                  "binder": {
-                    "kind": "Binder",
-                    "loc": null,
-                    "children": {
-                      "name": "cb"
-                    }
-                  },
-                  "ty": {
-                    "kind": "Type::Arrow",
-                    "loc": null,
-                    "children": {
-                      "args": {
-                        "kind": "Type::Arrow::ArgList",
-                        "loc": null,
-                        "children": []
-                      },
-                      "res": {
-                        "kind": "Type::Name",
-                        "loc": null,
-                        "children": {
-                          "constr_id": {
-                            "kind": "ConstrId",
-                            "loc": null,
-                            "children": {
-                              "id": {
-                                "kind": "LongIdent::Ident",
-                                "loc": null,
-                                "children": {
-                                  "value": "Int"
-                                }
-                              }
-                            }
-                          },
-                          "tys": {
-                            "kind": "Type::Name::TypeList",
-                            "loc": null,
-                            "children": []
-                          }
-                        }
-                      },
-                      "err": {
-                        "kind": "ErrorType::NoErrorType",
-                        "loc": null,
-                        "children": {}
-                      },
-                      "is_async": {
-                        "kind": "Async",
-                        "loc": null,
-                        "children": {}
-                      }
-                    }
-                  }
-                }
-              }
-            ]
-          },
-          "quantifiers": {
-            "kind": "FunDecl::QuantifierList",
-            "loc": null,
-            "children": []
-          },
-          "return_type": {
-            "kind": "Type::Name",
-            "loc": null,
-            "children": {
-              "constr_id": {
-                "kind": "ConstrId",
-                "loc": null,
-                "children": {
-                  "id": {
-                    "kind": "LongIdent::Ident",
-                    "loc": null,
-                    "children": {
-                      "value": "Int"
-                    }
-                  }
-                }
-              },
-              "tys": {
-                "kind": "Type::Name::TypeList",
-                "loc": null,
-                "children": []
-              }
-            }
-          },
-          "error_type": {
-            "kind": "ErrorType::NoErrorType",
-            "loc": null,
-            "children": {}
-          },
-          "vis": {
-            "kind": "Visibility::Default",
-            "loc": null,
-            "children": {}
-          },
-          "attrs": {
-            "kind": "FunDecl::AttrList",
-            "loc": null,
-            "children": []
-          },
-          "doc": ""
-        }
-      },
-      "decl_body": {
-        "kind": "DeclBody::DeclBody",
-        "loc": null,
-        "children": {
-          "local_types": {
-            "kind": "DeclBody::DeclBody::LocalTypeList",
-            "loc": null,
-            "children": []
-          },
-          "expr": {
-            "kind": "Expr::Apply",
-            "loc": null,
-            "children": {
-              "func": {
-                "kind": "Expr::Ident",
-                "loc": null,
-                "children": {
-                  "id": {
-                    "kind": "Var",
-                    "loc": null,
-                    "children": {
-                      "name": {
-                        "kind": "LongIdent::Ident",
-                        "loc": null,
-                        "children": {
-                          "value": "cb"
-                        }
-                      }
-                    }
-                  }
-                }
-              },
-              "args": {
-                "kind": "Expr::Apply::ArgumentList",
-                "loc": null,
-                "children": []
-              },
-              "attr": {
-                "kind": "ApplyAttr::NoAttr",
-                "loc": null,
-                "children": {}
-              }
-            }
-          }
-        }
-      }
-    }
-  },
-  {
-    "kind": "Impl::TopFuncDef",
-    "loc": null,
-    "children": {
-      "fun_decl": {
-        "kind": "FunDecl",
-        "loc": null,
-        "children": {
-          "type_name": null,
-          "name": {
-            "kind": "Binder",
-            "loc": null,
-            "children": {
-              "name": "main"
-            }
-          },
-          "has_error": null,
-          "is_async": null,
-          "decl_params": null,
-          "quantifiers": {
-            "kind": "FunDecl::QuantifierList",
-            "loc": null,
-            "children": []
-          },
-          "return_type": null,
-          "error_type": {
-            "kind": "ErrorType::NoErrorType",
-            "loc": null,
-            "children": {}
-          },
-          "vis": {
-            "kind": "Visibility::Default",
-            "loc": null,
-            "children": {}
-          },
-          "attrs": {
-            "kind": "FunDecl::AttrList",
-            "loc": null,
-            "children": []
-          },
-          "doc": ""
-        }
-      },
-      "decl_body": {
-        "kind": "DeclBody::DeclBody",
-        "loc": null,
-        "children": {
-          "local_types": {
-            "kind": "DeclBody::DeclBody::LocalTypeList",
-            "loc": null,
-            "children": []
-          },
-          "expr": {
-            "kind": "Expr::LetFn",
-            "loc": null,
-            "children": {
-              "name": {
-                "kind": "Binder",
-                "loc": null,
-                "children": {
-                  "name": "g"
-                }
-              },
-              "func": {
-                "kind": "Func::Lambda",
-                "loc": null,
-                "children": {
-                  "parameters": {
-                    "kind": "Func::Lambda::ParameterList",
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diff --git a/test/sync_test/__snapshot__/parse_test_attribute_name.json b/test/sync_test/__snapshot__/parse_test_attribute_name.json
index 2e34e8ae..9148ac38 100644
--- a/test/sync_test/__snapshot__/parse_test_attribute_name.json
+++ b/test/sync_test/__snapshot__/parse_test_attribute_name.json
@@ -167,7 +167,7 @@
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diff --git a/test/sync_test/__snapshot__/parse_test_bytes_literal.json b/test/sync_test/__snapshot__/parse_test_bytes_literal.json
deleted file mode 100644
index 453c35d4..00000000
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-                    "loc": null,
-                    "children": {
-                      "constant": {
-                        "kind": "Constant::Bytes",
-                        "loc": null,
-                        "children": {
-                          "value": "\\xGG"
-                        }
-                      }
-                    }
-                  },
-                  "body": {
-                    "kind": "Expr::Let",
-                    "loc": null,
-                    "children": {
-                      "pattern": {
-                        "kind": "Pattern::Any",
-                        "loc": null,
-                        "children": {}
-                      },
-                      "expr": {
-                        "kind": "Expr::Constant",
-                        "loc": null,
-                        "children": {
-                          "constant": {
-                            "kind": "Constant::Bytes",
-                            "loc": null,
-                            "children": {
-                              "value": "\\oFFF"
-                            }
-                          }
-                        }
-                      },
-                      "body": {
-                        "kind": "Expr::Unit",
-                        "loc": null,
-                        "children": {
-                          "faked": true
-                        }
-                      }
-                    }
-                  }
-                }
-              }
-            }
-          }
-        }
-      }
-    }
-  },
-  {
-    "kind": "Impl::TopLetDef",
-    "loc": null,
-    "children": {
-      "binder": {
-        "kind": "Binder",
-        "loc": null,
-        "children": {
-          "name": "g"
-        }
-      },
-      "ty": null,
-      "expr": {
-        "kind": "Expr::Constant",
-        "loc": null,
-        "children": {
-          "constant": {
-            "kind": "Constant::Bytes",
-            "loc": null,
-            "children": {
-              "value": "unfinished bytes literal"
-            }
-          }
-        }
-      },
-      "vis": {
-        "kind": "Visibility::Default",
-        "loc": null,
-        "children": {}
-      },
-      "is_constant": false,
-      "is_declare": false,
-      "attrs": {
-        "kind": "Impl::TopLetDef::AttrList",
-        "loc": null,
-        "children": []
-      },
-      "doc": ""
-    }
-  }
-]
\ No newline at end of file
diff --git a/test/sync_test/__snapshot__/parse_test_bytes_literal.mbt b/test/sync_test/__snapshot__/parse_test_bytes_literal.mbt
deleted file mode 100644
index 3e3e49ab..00000000
--- a/test/sync_test/__snapshot__/parse_test_bytes_literal.mbt
+++ /dev/null
@@ -1,13 +0,0 @@
-fn init {
-  let a = b"moonbit_rabbit"
-} 
-
-fn error() -> Unit {
-  let _ = b"moonbit🐇rabbit🐰" // error: ASCII in bytes literal is not allowed
-  let _ = b"\xGG" // error: invalid hex escape
-  let _ = b"\oFFF" // error: invalid oct escape
-}
-
-let g = b"unfinished bytes literal
-
-  
\ No newline at end of file
diff --git a/test/sync_test/__snapshot__/parse_test_catch_all.json b/test/sync_test/__snapshot__/parse_test_catch_noraise.json
similarity index 67%
rename from test/sync_test/__snapshot__/parse_test_catch_all.json
rename to test/sync_test/__snapshot__/parse_test_catch_noraise.json
index aba0cc2a..867a3f3c 100644
--- a/test/sync_test/__snapshot__/parse_test_catch_all.json
+++ b/test/sync_test/__snapshot__/parse_test_catch_noraise.json
@@ -56,77 +56,60 @@
             "loc": null,
             "children": {
               "body": {
-                "kind": "Expr::Group",
+                "kind": "Expr::Apply",
                 "loc": null,
                 "children": {
-                  "expr": {
-                    "kind": "Expr::Apply",
+                  "func": {
+                    "kind": "Expr::Ident",
                     "loc": null,
                     "children": {
-                      "func": {
-                        "kind": "Expr::Ident",
+                      "id": {
+                        "kind": "Var",
                         "loc": null,
                         "children": {
-                          "id": {
-                            "kind": "Var",
+                          "name": {
+                            "kind": "LongIdent::Ident",
                             "loc": null,
                             "children": {
-                              "name": {
-                                "kind": "LongIdent::Ident",
-                                "loc": null,
-                                "children": {
-                                  "value": "f"
-                                }
-                              }
+                              "value": "fail"
                             }
                           }
                         }
-                      },
-                      "args": {
-                        "kind": "Expr::Apply::ArgumentList",
+                      }
+                    }
+                  },
+                  "args": {
+                    "kind": "Expr::Apply::ArgumentList",
+                    "loc": null,
+                    "children": [
+                      {
+                        "kind": "Argument",
                         "loc": null,
-                        "children": [
-                          {
-                            "kind": "Argument",
+                        "children": {
+                          "value": {
+                            "kind": "Expr::Constant",
                             "loc": null,
                             "children": {
-                              "value": {
-                                "kind": "Expr::Ident",
+                              "constant": {
+                                "kind": "Constant::String",
                                 "loc": null,
                                 "children": {
-                                  "id": {
-                                    "kind": "Var",
-                                    "loc": null,
-                                    "children": {
-                                      "name": {
-                                        "kind": "LongIdent::Ident",
-                                        "loc": null,
-                                        "children": {
-                                          "value": "x"
-                                        }
-                                      }
-                                    }
-                                  }
+                                  "value": ""
                                 }
-                              },
-                              "kind": {
-                                "kind": "ArgumentKind::Positional",
-                                "loc": null,
-                                "children": {}
                               }
                             }
+                          },
+                          "kind": {
+                            "kind": "ArgumentKind::Positional",
+                            "loc": null,
+                            "children": {}
                           }
-                        ]
-                      },
-                      "attr": {
-                        "kind": "ApplyAttr::Exclamation",
-                        "loc": null,
-                        "children": {}
+                        }
                       }
-                    }
+                    ]
                   },
-                  "group": {
-                    "kind": "Group::Brace",
+                  "attr": {
+                    "kind": "ApplyAttr::NoAttr",
                     "loc": null,
                     "children": {}
                   }
@@ -141,29 +124,16 @@
                     "loc": null,
                     "children": {
                       "pattern": {
-                        "kind": "Pattern::Constr",
+                        "kind": "Pattern::Var",
                         "loc": null,
                         "children": {
-                          "constr": {
-                            "kind": "Constructor",
+                          "value": {
+                            "kind": "Binder",
                             "loc": null,
                             "children": {
-                              "name": {
-                                "kind": "ConstrName",
-                                "loc": null,
-                                "children": {
-                                  "name": "E1"
-                                }
-                              },
-                              "extra_info": {
-                                "kind": "ConstructorExtraInfo::NoExtraInfo",
-                                "loc": null,
-                                "children": {}
-                              }
+                              "name": "e"
                             }
-                          },
-                          "args": null,
-                          "is_open": false
+                          }
                         }
                       },
                       "guard": null,
@@ -199,14 +169,20 @@
                                 "loc": null,
                                 "children": {
                                   "value": {
-                                    "kind": "Expr::Constant",
+                                    "kind": "Expr::Ident",
                                     "loc": null,
                                     "children": {
-                                      "constant": {
-                                        "kind": "Constant::String",
+                                      "id": {
+                                        "kind": "Var",
                                         "loc": null,
                                         "children": {
-                                          "value": "x"
+                                          "name": {
+                                            "kind": "LongIdent::Ident",
+                                            "loc": null,
+                                            "children": {
+                                              "value": "e"
+                                            }
+                                          }
                                         }
                                       }
                                     }
@@ -228,7 +204,14 @@
                         }
                       }
                     }
-                  },
+                  }
+                ]
+              },
+              "catch_all": false,
+              "try_else": {
+                "kind": "Expr::Try::CaseList",
+                "loc": null,
+                "children": [
                   {
                     "kind": "Case",
                     "loc": null,
@@ -241,17 +224,17 @@
                             "kind": "Binder",
                             "loc": null,
                             "children": {
-                              "name": "e"
+                              "name": "u"
                             }
                           }
                         }
                       },
                       "guard": null,
                       "body": {
-                        "kind": "Expr::Raise",
+                        "kind": "Expr::Apply",
                         "loc": null,
                         "children": {
-                          "err_value": {
+                          "func": {
                             "kind": "Expr::Ident",
                             "loc": null,
                             "children": {
@@ -263,12 +246,53 @@
                                     "kind": "LongIdent::Ident",
                                     "loc": null,
                                     "children": {
-                                      "value": "e"
+                                      "value": "println"
                                     }
                                   }
                                 }
                               }
                             }
+                          },
+                          "args": {
+                            "kind": "Expr::Apply::ArgumentList",
+                            "loc": null,
+                            "children": [
+                              {
+                                "kind": "Argument",
+                                "loc": null,
+                                "children": {
+                                  "value": {
+                                    "kind": "Expr::Ident",
+                                    "loc": null,
+                                    "children": {
+                                      "id": {
+                                        "kind": "Var",
+                                        "loc": null,
+                                        "children": {
+                                          "name": {
+                                            "kind": "LongIdent::Ident",
+                                            "loc": null,
+                                            "children": {
+                                              "value": "u"
+                                            }
+                                          }
+                                        }
+                                      }
+                                    }
+                                  },
+                                  "kind": {
+                                    "kind": "ArgumentKind::Positional",
+                                    "loc": null,
+                                    "children": {}
+                                  }
+                                }
+                              }
+                            ]
+                          },
+                          "attr": {
+                            "kind": "ApplyAttr::NoAttr",
+                            "loc": null,
+                            "children": {}
                           }
                         }
                       }
@@ -276,9 +300,7 @@
                   }
                 ]
               },
-              "catch_all": false,
-              "try_else": null,
-              "has_try": true
+              "has_try": false
             }
           }
         }
diff --git a/test/sync_test/__snapshot__/parse_test_catch_noraise.mbt b/test/sync_test/__snapshot__/parse_test_catch_noraise.mbt
new file mode 100644
index 00000000..2f0e933f
--- /dev/null
+++ b/test/sync_test/__snapshot__/parse_test_catch_noraise.mbt
@@ -0,0 +1,16 @@
+fn main {
+  fail("") catch { e => println(e) } noraise { u => println(u) }
+}
+
+
+
+
+
+
+
+
+
+
+
+
+
diff --git a/test/sync_test/__snapshot__/parse_test_catch_noraise.mbt.tokens.json b/test/sync_test/__snapshot__/parse_test_catch_noraise.mbt.tokens.json
new file mode 100644
index 00000000..267da1f7
--- /dev/null
+++ b/test/sync_test/__snapshot__/parse_test_catch_noraise.mbt.tokens.json
@@ -0,0 +1,208 @@
+[
+  {
+    "token": "FN",
+    "loc": "1:1-1:3"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "main"
+    ],
+    "loc": "1:4-1:8"
+  },
+  {
+    "token": "LBRACE",
+    "loc": "1:9-1:10"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "1:10-1:11"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "fail"
+    ],
+    "loc": "2:3-2:7"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "2:7-2:8"
+  },
+  {
+    "token": [
+      "STRING",
+      ""
+    ],
+    "loc": "2:8-2:10"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "2:10-2:11"
+  },
+  {
+    "token": "CATCH",
+    "loc": "2:12-2:17"
+  },
+  {
+    "token": "LBRACE",
+    "loc": "2:18-2:19"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "e"
+    ],
+    "loc": "2:20-2:21"
+  },
+  {
+    "token": "FAT_ARROW",
+    "loc": "2:22-2:24"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "println"
+    ],
+    "loc": "2:25-2:32"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "2:32-2:33"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "e"
+    ],
+    "loc": "2:33-2:34"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "2:34-2:35"
+  },
+  {
+    "token": "RBRACE",
+    "loc": "2:36-2:37"
+  },
+  {
+    "token": "NORAISE",
+    "loc": "2:38-2:45"
+  },
+  {
+    "token": "LBRACE",
+    "loc": "2:46-2:47"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "u"
+    ],
+    "loc": "2:48-2:49"
+  },
+  {
+    "token": "FAT_ARROW",
+    "loc": "2:50-2:52"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "println"
+    ],
+    "loc": "2:53-2:60"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "2:60-2:61"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "u"
+    ],
+    "loc": "2:61-2:62"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "2:62-2:63"
+  },
+  {
+    "token": "RBRACE",
+    "loc": "2:64-2:65"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "2:65-2:66"
+  },
+  {
+    "token": "RBRACE",
+    "loc": "3:1-3:2"
+  },
+  {
+    "token": [
+      "SEMI",
+      false
+    ],
+    "loc": "3:2-3:2"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "3:2-3:3"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "4:1-4:2"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "5:1-5:2"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "6:1-6:2"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "7:1-7:2"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "8:1-8:2"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "9:1-9:2"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "10:1-10:2"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "11:1-11:2"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "12:1-12:2"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "13:1-13:2"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "14:1-14:2"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "15:1-15:2"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "16:1-16:2"
+  },
+  {
+    "token": "EOF",
+    "loc": "17:1-17:1"
+  }
+]
\ No newline at end of file
diff --git a/test/sync_test/__snapshot__/parse_test_error_type_question.json b/test/sync_test/__snapshot__/parse_test_error_type_question.json
deleted file mode 100644
index e70af5ae..00000000
--- a/test/sync_test/__snapshot__/parse_test_error_type_question.json
+++ /dev/null
@@ -1,117 +0,0 @@
-[
-  {
-    "kind": "Impl::TopFuncDef",
-    "loc": null,
-    "children": {
-      "fun_decl": {
-        "kind": "FunDecl",
-        "loc": null,
-        "children": {
-          "type_name": null,
-          "name": {
-            "kind": "Binder",
-            "loc": null,
-            "children": {
-              "name": "f"
-            }
-          },
-          "has_error": null,
-          "is_async": null,
-          "decl_params": {
-            "kind": "FunDecl::ParameterList",
-            "loc": null,
-            "children": []
-          },
-          "quantifiers": {
-            "kind": "FunDecl::QuantifierList",
-            "loc": null,
-            "children": []
-          },
-          "return_type": {
-            "kind": "Type::Name",
-            "loc": null,
-            "children": {
-              "constr_id": {
-                "kind": "ConstrId",
-                "loc": null,
-                "children": {
-                  "id": {
-                    "kind": "LongIdent::Ident",
-                    "loc": null,
-                    "children": {
-                      "value": "Unit"
-                    }
-                  }
-                }
-              },
-              "tys": {
-                "kind": "Type::Name::TypeList",
-                "loc": null,
-                "children": []
-              }
-            }
-          },
-          "error_type": {
-            "kind": "ErrorType::ErrorType",
-            "loc": null,
-            "children": {
-              "ty": {
-                "kind": "Type::Name",
-                "loc": null,
-                "children": {
-                  "constr_id": {
-                    "kind": "ConstrId",
-                    "loc": null,
-                    "children": {
-                      "id": {
-                        "kind": "LongIdent::Ident",
-                        "loc": null,
-                        "children": {
-                          "value": "E?"
-                        }
-                      }
-                    }
-                  },
-                  "tys": {
-                    "kind": "Type::Name::TypeList",
-                    "loc": null,
-                    "children": []
-                  }
-                }
-              }
-            }
-          },
-          "vis": {
-            "kind": "Visibility::Default",
-            "loc": null,
-            "children": {}
-          },
-          "attrs": {
-            "kind": "FunDecl::AttrList",
-            "loc": null,
-            "children": []
-          },
-          "doc": ""
-        }
-      },
-      "decl_body": {
-        "kind": "DeclBody::DeclBody",
-        "loc": null,
-        "children": {
-          "local_types": {
-            "kind": "DeclBody::DeclBody::LocalTypeList",
-            "loc": null,
-            "children": []
-          },
-          "expr": {
-            "kind": "Expr::Unit",
-            "loc": null,
-            "children": {
-              "faked": true
-            }
-          }
-        }
-      }
-    }
-  }
-]
\ No newline at end of file
diff --git a/test/sync_test/__snapshot__/parse_test_extern_type.json b/test/sync_test/__snapshot__/parse_test_extern_type.json
deleted file mode 100644
index 9440e3ee..00000000
--- a/test/sync_test/__snapshot__/parse_test_extern_type.json
+++ /dev/null
@@ -1,322 +0,0 @@
-[
-  {
-    "kind": "Impl::TopTypeDef",
-    "loc": null,
-    "children": {
-      "value": {
-        "kind": "TypeDecl",
-        "loc": null,
-        "children": {
-          "tycon": "T",
-          "params": {
-            "kind": "TypeDecl::ParamList",
-            "loc": null,
-            "children": []
-          },
-          "components": {
-            "kind": "TypeDesc::Extern",
-            "loc": null,
-            "children": {}
-          },
-          "attrs": {
-            "kind": "TypeDecl::AttrList",
-            "loc": null,
-            "children": []
-          },
-          "doc": "",
-          "type_vis": {
-            "kind": "Visibility::Default",
-            "loc": null,
-            "children": {}
-          },
-          "is_declare": false,
-          "deriving": {
-            "kind": "TypeDecl::DerivingList",
-            "loc": null,
-            "children": []
-          }
-        }
-      }
-    }
-  },
-  {
-    "kind": "Impl::TopTypeDef",
-    "loc": null,
-    "children": {
-      "value": {
-        "kind": "TypeDecl",
-        "loc": null,
-        "children": {
-          "tycon": "T",
-          "params": {
-            "kind": "TypeDecl::ParamList",
-            "loc": null,
-            "children": []
-          },
-          "components": {
-            "kind": "TypeDesc::Extern",
-            "loc": null,
-            "children": {}
-          },
-          "attrs": {
-            "kind": "TypeDecl::AttrList",
-            "loc": null,
-            "children": []
-          },
-          "doc": "",
-          "type_vis": {
-            "kind": "Visibility::Pub",
-            "loc": null,
-            "children": {
-              "attr": null
-            }
-          },
-          "is_declare": false,
-          "deriving": {
-            "kind": "TypeDecl::DerivingList",
-            "loc": null,
-            "children": []
-          }
-        }
-      }
-    }
-  },
-  {
-    "kind": "Impl::TopTypeDef",
-    "loc": null,
-    "children": {
-      "value": {
-        "kind": "TypeDecl",
-        "loc": null,
-        "children": {
-          "tycon": "T",
-          "params": {
-            "kind": "TypeDecl::ParamList",
-            "loc": null,
-            "children": []
-          },
-          "components": {
-            "kind": "TypeDesc::Extern",
-            "loc": null,
-            "children": {}
-          },
-          "attrs": {
-            "kind": "TypeDecl::AttrList",
-            "loc": null,
-            "children": []
-          },
-          "doc": "",
-          "type_vis": {
-            "kind": "Visibility::Default",
-            "loc": null,
-            "children": {}
-          },
-          "is_declare": false,
-          "deriving": {
-            "kind": "TypeDecl::DerivingList",
-            "loc": null,
-            "children": [
-              {
-                "kind": "DerivingDirective",
-                "loc": null,
-                "children": {
-                  "type_name": {
-                    "kind": "TypeName",
-                    "loc": null,
-                    "children": {
-                      "name": {
-                        "kind": "LongIdent::Ident",
-                        "loc": null,
-                        "children": {
-                          "value": "Show"
-                        }
-                      },
-                      "is_object": false
-                    }
-                  },
-                  "args": {
-                    "kind": "DerivingDirective::ArgList",
-                    "loc": null,
-                    "children": []
-                  }
-                }
-              }
-            ]
-          }
-        }
-      }
-    }
-  },
-  {
-    "kind": "Impl::TopTypeDef",
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deleted file mode 100644
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diff --git a/test/sync_test/__snapshot__/parse_test_fnname_bang.json b/test/sync_test/__snapshot__/parse_test_fnname_bang.json
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diff --git a/test/sync_test/__snapshot__/parse_test_function_type_with_trailing_comma.json b/test/sync_test/__snapshot__/parse_test_function_type_with_trailing_comma.json
deleted file mode 100644
index faa42567..00000000
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-  }
-]
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diff --git a/test/sync_test/__snapshot__/parse_test_match_match.json b/test/sync_test/__snapshot__/parse_test_match_match.json
deleted file mode 100644
index 950267de..00000000
--- a/test/sync_test/__snapshot__/parse_test_match_match.json
+++ /dev/null
@@ -1,421 +0,0 @@
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\ No newline at end of file
diff --git a/test/sync_test/__snapshot__/parse_test_nobreak.mbt b/test/sync_test/__snapshot__/parse_test_nobreak.mbt
new file mode 100644
index 00000000..922377ee
--- /dev/null
+++ b/test/sync_test/__snapshot__/parse_test_nobreak.mbt
@@ -0,0 +1,64 @@
+// Test nobreak keyword for while loops
+fn test_while_nobreak() -> Unit {
+  while true {
+    break
+  } nobreak {
+    println("completed without break")
+  }
+}
+
+// Test nobreak keyword for for loops
+fn test_for_nobreak() -> Unit {
+  for i = 0; i < 10; i = i + 1 {
+    if i == 5 {
+      break
+    }
+  } nobreak {
+    println("completed without break")
+  }
+}
+
+// Test nobreak keyword for foreach loops
+fn test_foreach_nobreak() -> Unit {
+  for x in [1, 2, 3] {
+    println(x)
+  } nobreak {
+    println("completed without break")
+  }
+}
+
+// Test nobreak with multiple binders in foreach
+fn test_foreach_nobreak_multi() -> Unit {
+  for k, v in [(1, "a"), (2, "b")] {
+    println(k)
+  } nobreak {
+    println("done")
+  }
+}
+
+// Test nested loops with nobreak
+fn test_nested_nobreak() -> Unit {
+  while true {
+    for i = 0; i < 5; i = i + 1 {
+      break
+    } nobreak {
+      println("inner loop completed")
+    }
+    break
+  } nobreak {
+    println("outer loop completed")
+  }
+}
+
+// Test nobreak with labeled loops
+fn test_labeled_nobreak() -> Unit {
+  outer: while true {
+    inner: for x in [1, 2, 3] {
+      break outer
+    } nobreak {
+      println("inner done")
+    }
+  } nobreak {
+    println("outer done")
+  }
+}
diff --git a/test/sync_test/__snapshot__/parse_test_nobreak.mbt.tokens.json b/test/sync_test/__snapshot__/parse_test_nobreak.mbt.tokens.json
new file mode 100644
index 00000000..874957e5
--- /dev/null
+++ b/test/sync_test/__snapshot__/parse_test_nobreak.mbt.tokens.json
@@ -0,0 +1,1493 @@
+[
+  {
+    "token": [
+      "COMMENT",
+      {
+        "content": "// Test nobreak keyword for while loops",
+        "kind": [
+          "Ownline",
+          {
+            "leading_blank_line": false,
+            "trailing_blank_line": false
+          }
+        ],
+        "consumed_by_docstring": false
+      }
+    ],
+    "loc": "1:1-1:40"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "1:40-1:41"
+  },
+  {
+    "token": "FN",
+    "loc": "2:1-2:3"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "test_while_nobreak"
+    ],
+    "loc": "2:4-2:22"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "2:22-2:23"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "2:23-2:24"
+  },
+  {
+    "token": "THIN_ARROW",
+    "loc": "2:25-2:27"
+  },
+  {
+    "token": [
+      "UIDENT",
+      "Unit"
+    ],
+    "loc": "2:28-2:32"
+  },
+  {
+    "token": "LBRACE",
+    "loc": "2:33-2:34"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "2:34-2:35"
+  },
+  {
+    "token": "WHILE",
+    "loc": "3:3-3:8"
+  },
+  {
+    "token": "TRUE",
+    "loc": "3:9-3:13"
+  },
+  {
+    "token": "LBRACE",
+    "loc": "3:14-3:15"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "3:15-3:16"
+  },
+  {
+    "token": "BREAK",
+    "loc": "4:5-4:10"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "4:10-4:11"
+  },
+  {
+    "token": "RBRACE",
+    "loc": "5:3-5:4"
+  },
+  {
+    "token": "NOBREAK",
+    "loc": "5:5-5:12"
+  },
+  {
+    "token": "LBRACE",
+    "loc": "5:13-5:14"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "5:14-5:15"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "println"
+    ],
+    "loc": "6:5-6:12"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "6:12-6:13"
+  },
+  {
+    "token": [
+      "STRING",
+      "completed without break"
+    ],
+    "loc": "6:13-6:38"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "6:38-6:39"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "6:39-6:40"
+  },
+  {
+    "token": "RBRACE",
+    "loc": "7:3-7:4"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "7:4-7:5"
+  },
+  {
+    "token": "RBRACE",
+    "loc": "8:1-8:2"
+  },
+  {
+    "token": [
+      "SEMI",
+      false
+    ],
+    "loc": "8:2-8:2"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "8:2-8:3"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "9:1-9:2"
+  },
+  {
+    "token": [
+      "COMMENT",
+      {
+        "content": "// Test nobreak keyword for for loops",
+        "kind": [
+          "Ownline",
+          {
+            "leading_blank_line": true,
+            "trailing_blank_line": false
+          }
+        ],
+        "consumed_by_docstring": false
+      }
+    ],
+    "loc": "10:1-10:38"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "10:38-10:39"
+  },
+  {
+    "token": "FN",
+    "loc": "11:1-11:3"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "test_for_nobreak"
+    ],
+    "loc": "11:4-11:20"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "11:20-11:21"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "11:21-11:22"
+  },
+  {
+    "token": "THIN_ARROW",
+    "loc": "11:23-11:25"
+  },
+  {
+    "token": [
+      "UIDENT",
+      "Unit"
+    ],
+    "loc": "11:26-11:30"
+  },
+  {
+    "token": "LBRACE",
+    "loc": "11:31-11:32"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "11:32-11:33"
+  },
+  {
+    "token": "FOR",
+    "loc": "12:3-12:6"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "i"
+    ],
+    "loc": "12:7-12:8"
+  },
+  {
+    "token": "EQUAL",
+    "loc": "12:9-12:10"
+  },
+  {
+    "token": [
+      "INT",
+      "0"
+    ],
+    "loc": "12:11-12:12"
+  },
+  {
+    "token": [
+      "SEMI",
+      true
+    ],
+    "loc": "12:12-12:13"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "i"
+    ],
+    "loc": "12:14-12:15"
+  },
+  {
+    "token": [
+      "INFIX1",
+      "<"
+    ],
+    "loc": "12:16-12:17"
+  },
+  {
+    "token": [
+      "INT",
+      "10"
+    ],
+    "loc": "12:18-12:20"
+  },
+  {
+    "token": [
+      "SEMI",
+      true
+    ],
+    "loc": "12:20-12:21"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "i"
+    ],
+    "loc": "12:22-12:23"
+  },
+  {
+    "token": "EQUAL",
+    "loc": "12:24-12:25"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "i"
+    ],
+    "loc": "12:26-12:27"
+  },
+  {
+    "token": "PLUS",
+    "loc": "12:28-12:29"
+  },
+  {
+    "token": [
+      "INT",
+      "1"
+    ],
+    "loc": "12:30-12:31"
+  },
+  {
+    "token": "LBRACE",
+    "loc": "12:32-12:33"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "12:33-12:34"
+  },
+  {
+    "token": "IF",
+    "loc": "13:5-13:7"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "i"
+    ],
+    "loc": "13:8-13:9"
+  },
+  {
+    "token": [
+      "INFIX1",
+      "=="
+    ],
+    "loc": "13:10-13:12"
+  },
+  {
+    "token": [
+      "INT",
+      "5"
+    ],
+    "loc": "13:13-13:14"
+  },
+  {
+    "token": "LBRACE",
+    "loc": "13:15-13:16"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "13:16-13:17"
+  },
+  {
+    "token": "BREAK",
+    "loc": "14:7-14:12"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "14:12-14:13"
+  },
+  {
+    "token": "RBRACE",
+    "loc": "15:5-15:6"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "15:6-15:7"
+  },
+  {
+    "token": "RBRACE",
+    "loc": "16:3-16:4"
+  },
+  {
+    "token": "NOBREAK",
+    "loc": "16:5-16:12"
+  },
+  {
+    "token": "LBRACE",
+    "loc": "16:13-16:14"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "16:14-16:15"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "println"
+    ],
+    "loc": "17:5-17:12"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "17:12-17:13"
+  },
+  {
+    "token": [
+      "STRING",
+      "completed without break"
+    ],
+    "loc": "17:13-17:38"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "17:38-17:39"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "17:39-17:40"
+  },
+  {
+    "token": "RBRACE",
+    "loc": "18:3-18:4"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "18:4-18:5"
+  },
+  {
+    "token": "RBRACE",
+    "loc": "19:1-19:2"
+  },
+  {
+    "token": [
+      "SEMI",
+      false
+    ],
+    "loc": "19:2-19:2"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "19:2-19:3"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "20:1-20:2"
+  },
+  {
+    "token": [
+      "COMMENT",
+      {
+        "content": "// Test nobreak keyword for foreach loops",
+        "kind": [
+          "Ownline",
+          {
+            "leading_blank_line": true,
+            "trailing_blank_line": false
+          }
+        ],
+        "consumed_by_docstring": false
+      }
+    ],
+    "loc": "21:1-21:42"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "21:42-21:43"
+  },
+  {
+    "token": "FN",
+    "loc": "22:1-22:3"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "test_foreach_nobreak"
+    ],
+    "loc": "22:4-22:24"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "22:24-22:25"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "22:25-22:26"
+  },
+  {
+    "token": "THIN_ARROW",
+    "loc": "22:27-22:29"
+  },
+  {
+    "token": [
+      "UIDENT",
+      "Unit"
+    ],
+    "loc": "22:30-22:34"
+  },
+  {
+    "token": "LBRACE",
+    "loc": "22:35-22:36"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "22:36-22:37"
+  },
+  {
+    "token": "FOR",
+    "loc": "23:3-23:6"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "x"
+    ],
+    "loc": "23:7-23:8"
+  },
+  {
+    "token": "IN",
+    "loc": "23:9-23:11"
+  },
+  {
+    "token": "LBRACKET",
+    "loc": "23:12-23:13"
+  },
+  {
+    "token": [
+      "INT",
+      "1"
+    ],
+    "loc": "23:13-23:14"
+  },
+  {
+    "token": "COMMA",
+    "loc": "23:14-23:15"
+  },
+  {
+    "token": [
+      "INT",
+      "2"
+    ],
+    "loc": "23:16-23:17"
+  },
+  {
+    "token": "COMMA",
+    "loc": "23:17-23:18"
+  },
+  {
+    "token": [
+      "INT",
+      "3"
+    ],
+    "loc": "23:19-23:20"
+  },
+  {
+    "token": "RBRACKET",
+    "loc": "23:20-23:21"
+  },
+  {
+    "token": "LBRACE",
+    "loc": "23:22-23:23"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "23:23-23:24"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "println"
+    ],
+    "loc": "24:5-24:12"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "24:12-24:13"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "x"
+    ],
+    "loc": "24:13-24:14"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "24:14-24:15"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "24:15-24:16"
+  },
+  {
+    "token": "RBRACE",
+    "loc": "25:3-25:4"
+  },
+  {
+    "token": "NOBREAK",
+    "loc": "25:5-25:12"
+  },
+  {
+    "token": "LBRACE",
+    "loc": "25:13-25:14"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "25:14-25:15"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "println"
+    ],
+    "loc": "26:5-26:12"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "26:12-26:13"
+  },
+  {
+    "token": [
+      "STRING",
+      "completed without break"
+    ],
+    "loc": "26:13-26:38"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "26:38-26:39"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "26:39-26:40"
+  },
+  {
+    "token": "RBRACE",
+    "loc": "27:3-27:4"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "27:4-27:5"
+  },
+  {
+    "token": "RBRACE",
+    "loc": "28:1-28:2"
+  },
+  {
+    "token": [
+      "SEMI",
+      false
+    ],
+    "loc": "28:2-28:2"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "28:2-28:3"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "29:1-29:2"
+  },
+  {
+    "token": [
+      "COMMENT",
+      {
+        "content": "// Test nobreak with multiple binders in foreach",
+        "kind": [
+          "Ownline",
+          {
+            "leading_blank_line": true,
+            "trailing_blank_line": false
+          }
+        ],
+        "consumed_by_docstring": false
+      }
+    ],
+    "loc": "30:1-30:49"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "30:49-30:50"
+  },
+  {
+    "token": "FN",
+    "loc": "31:1-31:3"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "test_foreach_nobreak_multi"
+    ],
+    "loc": "31:4-31:30"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "31:30-31:31"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "31:31-31:32"
+  },
+  {
+    "token": "THIN_ARROW",
+    "loc": "31:33-31:35"
+  },
+  {
+    "token": [
+      "UIDENT",
+      "Unit"
+    ],
+    "loc": "31:36-31:40"
+  },
+  {
+    "token": "LBRACE",
+    "loc": "31:41-31:42"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "31:42-31:43"
+  },
+  {
+    "token": "FOR",
+    "loc": "32:3-32:6"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "k"
+    ],
+    "loc": "32:7-32:8"
+  },
+  {
+    "token": "COMMA",
+    "loc": "32:8-32:9"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "v"
+    ],
+    "loc": "32:10-32:11"
+  },
+  {
+    "token": "IN",
+    "loc": "32:12-32:14"
+  },
+  {
+    "token": "LBRACKET",
+    "loc": "32:15-32:16"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "32:16-32:17"
+  },
+  {
+    "token": [
+      "INT",
+      "1"
+    ],
+    "loc": "32:17-32:18"
+  },
+  {
+    "token": "COMMA",
+    "loc": "32:18-32:19"
+  },
+  {
+    "token": [
+      "STRING",
+      "a"
+    ],
+    "loc": "32:20-32:23"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "32:23-32:24"
+  },
+  {
+    "token": "COMMA",
+    "loc": "32:24-32:25"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "32:26-32:27"
+  },
+  {
+    "token": [
+      "INT",
+      "2"
+    ],
+    "loc": "32:27-32:28"
+  },
+  {
+    "token": "COMMA",
+    "loc": "32:28-32:29"
+  },
+  {
+    "token": [
+      "STRING",
+      "b"
+    ],
+    "loc": "32:30-32:33"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "32:33-32:34"
+  },
+  {
+    "token": "RBRACKET",
+    "loc": "32:34-32:35"
+  },
+  {
+    "token": "LBRACE",
+    "loc": "32:36-32:37"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "32:37-32:38"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "println"
+    ],
+    "loc": "33:5-33:12"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "33:12-33:13"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "k"
+    ],
+    "loc": "33:13-33:14"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "33:14-33:15"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "33:15-33:16"
+  },
+  {
+    "token": "RBRACE",
+    "loc": "34:3-34:4"
+  },
+  {
+    "token": "NOBREAK",
+    "loc": "34:5-34:12"
+  },
+  {
+    "token": "LBRACE",
+    "loc": "34:13-34:14"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "34:14-34:15"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "println"
+    ],
+    "loc": "35:5-35:12"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "35:12-35:13"
+  },
+  {
+    "token": [
+      "STRING",
+      "done"
+    ],
+    "loc": "35:13-35:19"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "35:19-35:20"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "35:20-35:21"
+  },
+  {
+    "token": "RBRACE",
+    "loc": "36:3-36:4"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "36:4-36:5"
+  },
+  {
+    "token": "RBRACE",
+    "loc": "37:1-37:2"
+  },
+  {
+    "token": [
+      "SEMI",
+      false
+    ],
+    "loc": "37:2-37:2"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "37:2-37:3"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "38:1-38:2"
+  },
+  {
+    "token": [
+      "COMMENT",
+      {
+        "content": "// Test nested loops with nobreak",
+        "kind": [
+          "Ownline",
+          {
+            "leading_blank_line": true,
+            "trailing_blank_line": false
+          }
+        ],
+        "consumed_by_docstring": false
+      }
+    ],
+    "loc": "39:1-39:34"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "39:34-39:35"
+  },
+  {
+    "token": "FN",
+    "loc": "40:1-40:3"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "test_nested_nobreak"
+    ],
+    "loc": "40:4-40:23"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "40:23-40:24"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "40:24-40:25"
+  },
+  {
+    "token": "THIN_ARROW",
+    "loc": "40:26-40:28"
+  },
+  {
+    "token": [
+      "UIDENT",
+      "Unit"
+    ],
+    "loc": "40:29-40:33"
+  },
+  {
+    "token": "LBRACE",
+    "loc": "40:34-40:35"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "40:35-40:36"
+  },
+  {
+    "token": "WHILE",
+    "loc": "41:3-41:8"
+  },
+  {
+    "token": "TRUE",
+    "loc": "41:9-41:13"
+  },
+  {
+    "token": "LBRACE",
+    "loc": "41:14-41:15"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "41:15-41:16"
+  },
+  {
+    "token": "FOR",
+    "loc": "42:5-42:8"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "i"
+    ],
+    "loc": "42:9-42:10"
+  },
+  {
+    "token": "EQUAL",
+    "loc": "42:11-42:12"
+  },
+  {
+    "token": [
+      "INT",
+      "0"
+    ],
+    "loc": "42:13-42:14"
+  },
+  {
+    "token": [
+      "SEMI",
+      true
+    ],
+    "loc": "42:14-42:15"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "i"
+    ],
+    "loc": "42:16-42:17"
+  },
+  {
+    "token": [
+      "INFIX1",
+      "<"
+    ],
+    "loc": "42:18-42:19"
+  },
+  {
+    "token": [
+      "INT",
+      "5"
+    ],
+    "loc": "42:20-42:21"
+  },
+  {
+    "token": [
+      "SEMI",
+      true
+    ],
+    "loc": "42:21-42:22"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "i"
+    ],
+    "loc": "42:23-42:24"
+  },
+  {
+    "token": "EQUAL",
+    "loc": "42:25-42:26"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "i"
+    ],
+    "loc": "42:27-42:28"
+  },
+  {
+    "token": "PLUS",
+    "loc": "42:29-42:30"
+  },
+  {
+    "token": [
+      "INT",
+      "1"
+    ],
+    "loc": "42:31-42:32"
+  },
+  {
+    "token": "LBRACE",
+    "loc": "42:33-42:34"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "42:34-42:35"
+  },
+  {
+    "token": "BREAK",
+    "loc": "43:7-43:12"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "43:12-43:13"
+  },
+  {
+    "token": "RBRACE",
+    "loc": "44:5-44:6"
+  },
+  {
+    "token": "NOBREAK",
+    "loc": "44:7-44:14"
+  },
+  {
+    "token": "LBRACE",
+    "loc": "44:15-44:16"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "44:16-44:17"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "println"
+    ],
+    "loc": "45:7-45:14"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "45:14-45:15"
+  },
+  {
+    "token": [
+      "STRING",
+      "inner loop completed"
+    ],
+    "loc": "45:15-45:37"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "45:37-45:38"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "45:38-45:39"
+  },
+  {
+    "token": "RBRACE",
+    "loc": "46:5-46:6"
+  },
+  {
+    "token": [
+      "SEMI",
+      false
+    ],
+    "loc": "46:6-46:6"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "46:6-46:7"
+  },
+  {
+    "token": "BREAK",
+    "loc": "47:5-47:10"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "47:10-47:11"
+  },
+  {
+    "token": "RBRACE",
+    "loc": "48:3-48:4"
+  },
+  {
+    "token": "NOBREAK",
+    "loc": "48:5-48:12"
+  },
+  {
+    "token": "LBRACE",
+    "loc": "48:13-48:14"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "48:14-48:15"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "println"
+    ],
+    "loc": "49:5-49:12"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "49:12-49:13"
+  },
+  {
+    "token": [
+      "STRING",
+      "outer loop completed"
+    ],
+    "loc": "49:13-49:35"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "49:35-49:36"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "49:36-49:37"
+  },
+  {
+    "token": "RBRACE",
+    "loc": "50:3-50:4"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "50:4-50:5"
+  },
+  {
+    "token": "RBRACE",
+    "loc": "51:1-51:2"
+  },
+  {
+    "token": [
+      "SEMI",
+      false
+    ],
+    "loc": "51:2-51:2"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "51:2-51:3"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "52:1-52:2"
+  },
+  {
+    "token": [
+      "COMMENT",
+      {
+        "content": "// Test nobreak with labeled loops",
+        "kind": [
+          "Ownline",
+          {
+            "leading_blank_line": true,
+            "trailing_blank_line": false
+          }
+        ],
+        "consumed_by_docstring": false
+      }
+    ],
+    "loc": "53:1-53:35"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "53:35-53:36"
+  },
+  {
+    "token": "FN",
+    "loc": "54:1-54:3"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "test_labeled_nobreak"
+    ],
+    "loc": "54:4-54:24"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "54:24-54:25"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "54:25-54:26"
+  },
+  {
+    "token": "THIN_ARROW",
+    "loc": "54:27-54:29"
+  },
+  {
+    "token": [
+      "UIDENT",
+      "Unit"
+    ],
+    "loc": "54:30-54:34"
+  },
+  {
+    "token": "LBRACE",
+    "loc": "54:35-54:36"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "54:36-54:37"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "outer"
+    ],
+    "loc": "55:3-55:8"
+  },
+  {
+    "token": "COLON",
+    "loc": "55:8-55:9"
+  },
+  {
+    "token": "WHILE",
+    "loc": "55:10-55:15"
+  },
+  {
+    "token": "TRUE",
+    "loc": "55:16-55:20"
+  },
+  {
+    "token": "LBRACE",
+    "loc": "55:21-55:22"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "55:22-55:23"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "inner"
+    ],
+    "loc": "56:5-56:10"
+  },
+  {
+    "token": "COLON",
+    "loc": "56:10-56:11"
+  },
+  {
+    "token": "FOR",
+    "loc": "56:12-56:15"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "x"
+    ],
+    "loc": "56:16-56:17"
+  },
+  {
+    "token": "IN",
+    "loc": "56:18-56:20"
+  },
+  {
+    "token": "LBRACKET",
+    "loc": "56:21-56:22"
+  },
+  {
+    "token": [
+      "INT",
+      "1"
+    ],
+    "loc": "56:22-56:23"
+  },
+  {
+    "token": "COMMA",
+    "loc": "56:23-56:24"
+  },
+  {
+    "token": [
+      "INT",
+      "2"
+    ],
+    "loc": "56:25-56:26"
+  },
+  {
+    "token": "COMMA",
+    "loc": "56:26-56:27"
+  },
+  {
+    "token": [
+      "INT",
+      "3"
+    ],
+    "loc": "56:28-56:29"
+  },
+  {
+    "token": "RBRACKET",
+    "loc": "56:29-56:30"
+  },
+  {
+    "token": "LBRACE",
+    "loc": "56:31-56:32"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "56:32-56:33"
+  },
+  {
+    "token": "BREAK",
+    "loc": "57:7-57:12"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "outer"
+    ],
+    "loc": "57:13-57:18"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "57:18-57:19"
+  },
+  {
+    "token": "RBRACE",
+    "loc": "58:5-58:6"
+  },
+  {
+    "token": "NOBREAK",
+    "loc": "58:7-58:14"
+  },
+  {
+    "token": "LBRACE",
+    "loc": "58:15-58:16"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "58:16-58:17"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "println"
+    ],
+    "loc": "59:7-59:14"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "59:14-59:15"
+  },
+  {
+    "token": [
+      "STRING",
+      "inner done"
+    ],
+    "loc": "59:15-59:27"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "59:27-59:28"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "59:28-59:29"
+  },
+  {
+    "token": "RBRACE",
+    "loc": "60:5-60:6"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "60:6-60:7"
+  },
+  {
+    "token": "RBRACE",
+    "loc": "61:3-61:4"
+  },
+  {
+    "token": "NOBREAK",
+    "loc": "61:5-61:12"
+  },
+  {
+    "token": "LBRACE",
+    "loc": "61:13-61:14"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "61:14-61:15"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "println"
+    ],
+    "loc": "62:5-62:12"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "62:12-62:13"
+  },
+  {
+    "token": [
+      "STRING",
+      "outer done"
+    ],
+    "loc": "62:13-62:25"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "62:25-62:26"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "62:26-62:27"
+  },
+  {
+    "token": "RBRACE",
+    "loc": "63:3-63:4"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "63:4-63:5"
+  },
+  {
+    "token": "RBRACE",
+    "loc": "64:1-64:2"
+  },
+  {
+    "token": [
+      "SEMI",
+      false
+    ],
+    "loc": "64:2-64:2"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "64:2-64:3"
+  },
+  {
+    "token": "EOF",
+    "loc": "65:1-65:1"
+  }
+]
\ No newline at end of file
diff --git a/test/sync_test/__snapshot__/parse_test_old_maybe_error_return_syntax.json b/test/sync_test/__snapshot__/parse_test_old_maybe_error_return_syntax.json
deleted file mode 100644
index 4073fa28..00000000
--- a/test/sync_test/__snapshot__/parse_test_old_maybe_error_return_syntax.json
+++ /dev/null
@@ -1,117 +0,0 @@
-[
-  {
-    "kind": "Impl::TopFuncDef",
-    "loc": null,
-    "children": {
-      "fun_decl": {
-        "kind": "FunDecl",
-        "loc": null,
-        "children": {
-          "type_name": null,
-          "name": {
-            "kind": "Binder",
-            "loc": null,
-            "children": {
-              "name": "f"
-            }
-          },
-          "has_error": null,
-          "is_async": null,
-          "decl_params": {
-            "kind": "FunDecl::ParameterList",
-            "loc": null,
-            "children": []
-          },
-          "quantifiers": {
-            "kind": "FunDecl::QuantifierList",
-            "loc": null,
-            "children": []
-          },
-          "return_type": {
-            "kind": "Type::Name",
-            "loc": null,
-            "children": {
-              "constr_id": {
-                "kind": "ConstrId",
-                "loc": null,
-                "children": {
-                  "id": {
-                    "kind": "LongIdent::Ident",
-                    "loc": null,
-                    "children": {
-                      "value": "Int"
-                    }
-                  }
-                }
-              },
-              "tys": {
-                "kind": "Type::Name::TypeList",
-                "loc": null,
-                "children": []
-              }
-            }
-          },
-          "error_type": {
-            "kind": "ErrorType::MaybeError",
-            "loc": null,
-            "children": {
-              "ty": {
-                "kind": "Type::Name",
-                "loc": null,
-                "children": {
-                  "constr_id": {
-                    "kind": "ConstrId",
-                    "loc": null,
-                    "children": {
-                      "id": {
-                        "kind": "LongIdent::Ident",
-                        "loc": null,
-                        "children": {
-                          "value": "Unit"
-                        }
-                      }
-                    }
-                  },
-                  "tys": {
-                    "kind": "Type::Name::TypeList",
-                    "loc": null,
-                    "children": []
-                  }
-                }
-              }
-            }
-          },
-          "vis": {
-            "kind": "Visibility::Default",
-            "loc": null,
-            "children": {}
-          },
-          "attrs": {
-            "kind": "FunDecl::AttrList",
-            "loc": null,
-            "children": []
-          },
-          "doc": ""
-        }
-      },
-      "decl_body": {
-        "kind": "DeclBody::DeclBody",
-        "loc": null,
-        "children": {
-          "local_types": {
-            "kind": "DeclBody::DeclBody::LocalTypeList",
-            "loc": null,
-            "children": []
-          },
-          "expr": {
-            "kind": "Expr::Unit",
-            "loc": null,
-            "children": {
-              "faked": true
-            }
-          }
-        }
-      }
-    }
-  }
-]
\ No newline at end of file
diff --git a/test/sync_test/__snapshot__/parse_test_postfix_catch_all.json b/test/sync_test/__snapshot__/parse_test_postfix_catch_all.json
deleted file mode 100644
index 705a3571..00000000
--- a/test/sync_test/__snapshot__/parse_test_postfix_catch_all.json
+++ /dev/null
@@ -1,129 +0,0 @@
-[
-  {
-    "kind": "Impl::TopFuncDef",
-    "loc": null,
-    "children": {
-      "fun_decl": {
-        "kind": "FunDecl",
-        "loc": null,
-        "children": {
-          "type_name": null,
-          "name": {
-            "kind": "Binder",
-            "loc": null,
-            "children": {
-              "name": "main"
-            }
-          },
-          "has_error": null,
-          "is_async": null,
-          "decl_params": null,
-          "quantifiers": {
-            "kind": "FunDecl::QuantifierList",
-            "loc": null,
-            "children": []
-          },
-          "return_type": null,
-          "error_type": {
-            "kind": "ErrorType::NoErrorType",
-            "loc": null,
-            "children": {}
-          },
-          "vis": {
-            "kind": "Visibility::Default",
-            "loc": null,
-            "children": {}
-          },
-          "attrs": {
-            "kind": "FunDecl::AttrList",
-            "loc": null,
-            "children": []
-          },
-          "doc": ""
-        }
-      },
-      "decl_body": {
-        "kind": "DeclBody::DeclBody",
-        "loc": null,
-        "children": {
-          "local_types": {
-            "kind": "DeclBody::DeclBody::LocalTypeList",
-            "loc": null,
-            "children": []
-          },
-          "expr": {
-            "kind": "Expr::Let",
-            "loc": null,
-            "children": {
-              "pattern": {
-                "kind": "Pattern::Any",
-                "loc": null,
-                "children": {}
-              },
-              "expr": {
-                "kind": "Expr::Try",
-                "loc": null,
-                "children": {
-                  "body": {
-                    "kind": "Expr::Constant",
-                    "loc": null,
-                    "children": {
-                      "constant": {
-                        "kind": "Constant::Int",
-                        "loc": null,
-                        "children": {
-                          "value": "1"
-                        }
-                      }
-                    }
-                  },
-                  "catch": {
-                    "kind": "Expr::Try::CaseList",
-                    "loc": null,
-                    "children": [
-                      {
-                        "kind": "Case",
-                        "loc": null,
-                        "children": {
-                          "pattern": {
-                            "kind": "Pattern::Any",
-                            "loc": null,
-                            "children": {}
-                          },
-                          "guard": null,
-                          "body": {
-                            "kind": "Expr::Constant",
-                            "loc": null,
-                            "children": {
-                              "constant": {
-                                "kind": "Constant::Int",
-                                "loc": null,
-                                "children": {
-                                  "value": "0"
-                                }
-                              }
-                            }
-                          }
-                        }
-                      }
-                    ]
-                  },
-                  "catch_all": true,
-                  "try_else": null,
-                  "has_try": false
-                }
-              },
-              "body": {
-                "kind": "Expr::Unit",
-                "loc": null,
-                "children": {
-                  "faked": true
-                }
-              }
-            }
-          }
-        }
-      }
-    }
-  }
-]
\ No newline at end of file
diff --git a/test/sync_test/__snapshot__/parse_test_postfix_label.json b/test/sync_test/__snapshot__/parse_test_postfix_label.json
deleted file mode 100644
index c9a70a1d..00000000
--- a/test/sync_test/__snapshot__/parse_test_postfix_label.json
+++ /dev/null
@@ -1,3117 +0,0 @@
-[
-  {
-    "kind": "Impl::TopTypeDef",
-    "loc": null,
-    "children": {
-      "value": {
-        "kind": "TypeDecl",
-        "loc": null,
-        "children": {
-          "tycon": "FooA",
-          "params": {
-            "kind": "TypeDecl::ParamList",
-            "loc": null,
-            "children": []
-          },
-          "components": {
-            "kind": "TypeDesc::Error",
-            "loc": null,
-            "children": {
-              "value": {
-                "kind": "ExceptionDecl::EnumPayload",
-                "loc": null,
-                "children": {
-                  "value": {
-                    "kind": "ExceptionDecl::EnumPayload::ConstrList",
-                    "loc": null,
-                    "children": [
-                      {
-                        "kind": "ConstrDecl",
-                        "loc": null,
-                        "children": {
-                          "name": {
-                            "kind": "ConstrName",
-                            "loc": null,
-                            "children": {
-                              "name": "BarA"
-                            }
-                          },
-                          "args": {
-                            "kind": "ConstrDecl::ArgList",
-                            "loc": null,
-                            "children": [
-                              {
-                                "kind": "ConstrParam",
-                                "loc": null,
-                                "children": {
-                                  "ty": {
-                                    "kind": "Type::Name",
-                                    "loc": null,
-                                    "children": {
-                                      "constr_id": {
-                                        "kind": "ConstrId",
-                                        "loc": null,
-                                        "children": {
-                                          "id": {
-                                            "kind": "LongIdent::Ident",
-                                            "loc": null,
-                                            "children": {
-                                              "value": "Int"
-                                            }
-                                          }
-                                        }
-                                      },
-                                      "tys": {
-                                        "kind": "Type::Name::TypeList",
-                                        "loc": null,
-                                        "children": []
-                                      }
-                                    }
-                                  },
-                                  "mut": false,
-                                  "label": {
-                                    "kind": "Label",
-                                    "loc": null,
-                                    "children": {
-                                      "name": "label1"
-                                    }
-                                  }
-                                }
-                              },
-                              {
-                                "kind": "ConstrParam",
-                                "loc": null,
-                                "children": {
-                                  "ty": {
-                                    "kind": "Type::Name",
-                                    "loc": null,
-                                    "children": {
-                                      "constr_id": {
-                                        "kind": "ConstrId",
-                                        "loc": null,
-                                        "children": {
-                                          "id": {
-                                            "kind": "LongIdent::Ident",
-                                            "loc": null,
-                                            "children": {
-                                              "value": "Bool"
-                                            }
-                                          }
-                                        }
-                                      },
-                                      "tys": {
-                                        "kind": "Type::Name::TypeList",
-                                        "loc": null,
-                                        "children": []
-                                      }
-                                    }
-                                  },
-                                  "mut": false,
-                                  "label": {
-                                    "kind": "Label",
-                                    "loc": null,
-                                    "children": {
-                                      "name": "label2"
-                                    }
-                                  }
-                                }
-                              }
-                            ]
-                          },
-                          "tag": null,
-                          "attrs": {
-                            "kind": "ConstrDecl::AttrList",
-                            "loc": null,
-                            "children": []
-                          },
-                          "doc": ""
-                        }
-                      }
-                    ]
-                  }
-                }
-              }
-            }
-          },
-          "attrs": {
-            "kind": "TypeDecl::AttrList",
-            "loc": null,
-            "children": []
-          },
-          "doc": "",
-          "type_vis": {
-            "kind": "Visibility::Default",
-            "loc": null,
-            "children": {}
-          },
-          "is_declare": false,
-          "deriving": {
-            "kind": "TypeDecl::DerivingList",
-            "loc": null,
-            "children": []
-          }
-        }
-      }
-    }
-  },
-  {
-    "kind": "Impl::TopTest",
-    "loc": null,
-    "children": {
-      "expr": {
-        "kind": "Expr::Let",
-        "loc": null,
-        "children": {
-          "pattern": {
-            "kind": "Pattern::Var",
-            "loc": null,
-            "children": {
-              "value": {
-                "kind": "Binder",
-                "loc": null,
-                "children": {
-                  "name": "label1"
-                }
-              }
-            }
-          },
-          "expr": {
-            "kind": "Expr::Constant",
-            "loc": null,
-            "children": {
-              "constant": {
-                "kind": "Constant::Int",
-                "loc": null,
-                "children": {
-                  "value": "5"
-                }
-              }
-            }
-          },
-          "body": {
-            "kind": "Expr::Let",
-            "loc": null,
-            "children": {
-              "pattern": {
-                "kind": "Pattern::Var",
-                "loc": null,
-                "children": {
-                  "value": {
-                    "kind": "Binder",
-                    "loc": null,
-                    "children": {
-                      "name": "fooa"
-                    }
-                  }
-                }
-              },
-              "expr": {
-                "kind": "Expr::Apply",
-                "loc": null,
-                "children": {
-                  "func": {
-                    "kind": "Expr::Constr",
-                    "loc": null,
-                    "children": {
-                      "constr": {
-                        "kind": "Constructor",
-                        "loc": null,
-                        "children": {
-                          "name": {
-                            "kind": "ConstrName",
-                            "loc": null,
-                            "children": {
-                              "name": "BarA"
-                            }
-                          },
-                          "extra_info": {
-                            "kind": "ConstructorExtraInfo::NoExtraInfo",
-                            "loc": null,
-                            "children": {}
-                          }
-                        }
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diff --git a/test/sync_test/__snapshot__/parse_test_text_segment_test.json b/test/sync_test/__snapshot__/parse_test_text_segment_test.json
deleted file mode 100644
index aa695e4c..00000000
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\ No newline at end of file
diff --git a/test/sync_test/__snapshot__/parse_test_traitalias_list_no_pkg.json b/test/sync_test/__snapshot__/parse_test_traitalias_list_no_pkg.json
deleted file mode 100644
index 0f4f314b..00000000
--- a/test/sync_test/__snapshot__/parse_test_traitalias_list_no_pkg.json
+++ /dev/null
@@ -1,61 +0,0 @@
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-      "doc": ""
-    }
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-]
\ No newline at end of file
diff --git a/test/sync_test/__snapshot__/parse_test_traitalias_pkg_single_target.json b/test/sync_test/__snapshot__/parse_test_traitalias_pkg_single_target.json
deleted file mode 100644
index b57ed38d..00000000
--- a/test/sync_test/__snapshot__/parse_test_traitalias_pkg_single_target.json
+++ /dev/null
@@ -1,104 +0,0 @@
-[
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-        "loc": null,
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-                "children": {
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-        "children": []
-      },
-      "is_list": false,
-      "doc": ""
-    }
-  }
-]
\ No newline at end of file
diff --git a/test/sync_test/__snapshot__/parse_test_try_expr_catch_bang.json b/test/sync_test/__snapshot__/parse_test_try_expr_catch_bang.json
deleted file mode 100644
index 12c82ef1..00000000
--- a/test/sync_test/__snapshot__/parse_test_try_expr_catch_bang.json
+++ /dev/null
@@ -1,129 +0,0 @@
-[
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-    "children": {
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-                        "children": {
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-                    "loc": null,
-                    "children": [
-                      {
-                        "kind": "Case",
-                        "loc": null,
-                        "children": {
-                          "pattern": {
-                            "kind": "Pattern::Any",
-                            "loc": null,
-                            "children": {}
-                          },
-                          "guard": null,
-                          "body": {
-                            "kind": "Expr::Constant",
-                            "loc": null,
-                            "children": {
-                              "constant": {
-                                "kind": "Constant::Int",
-                                "loc": null,
-                                "children": {
-                                  "value": "0"
-                                }
-                              }
-                            }
-                          }
-                        }
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-                  "try_else": null,
-                  "has_try": true
-                }
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-                "kind": "Expr::Unit",
-                "loc": null,
-                "children": {
-                  "faked": true
-                }
-              }
-            }
-          }
-        }
-      }
-    }
-  }
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\ No newline at end of file
diff --git a/test/sync_test/__snapshot__/parse_test_tuple_multiline_str.json b/test/sync_test/__snapshot__/parse_test_tuple_multiline_str.json
deleted file mode 100644
index c3e041bc..00000000
--- a/test/sync_test/__snapshot__/parse_test_tuple_multiline_str.json
+++ /dev/null
@@ -1,305 +0,0 @@
-[
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-    "kind": "Impl::TopFuncDef",
-    "loc": null,
-    "children": {
-      "fun_decl": {
-        "kind": "FunDecl",
-        "loc": null,
-        "children": {
-          "type_name": null,
-          "name": {
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-            "loc": null,
-            "children": {
-              "name": "f"
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-            "children": {
-              "constr_id": {
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-                    "children": {
-                      "value": "Unit"
-                    }
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-                "kind": "Type::Name::TypeList",
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-            "children": {}
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-          },
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-        "children": {
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-                    "kind": "Pattern::Var",
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-                        "children": {
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-                    "children": {
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-                        "children": {
-                          "id": {
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-                            "loc": null,
-                            "children": {
-                              "value": "Array"
-                            }
-                          }
-                        }
-                      },
-                      "tys": {
-                        "kind": "Type::Name::TypeList",
-                        "loc": null,
-                        "children": [
-                          {
-                            "kind": "Type::Tuple",
-                            "loc": null,
-                            "children": {
-                              "tys": {
-                                "kind": "Type::Tuple::TypeList",
-                                "loc": null,
-                                "children": [
-                                  {
-                                    "kind": "Type::Name",
-                                    "loc": null,
-                                    "children": {
-                                      "constr_id": {
-                                        "kind": "ConstrId",
-                                        "loc": null,
-                                        "children": {
-                                          "id": {
-                                            "kind": "LongIdent::Ident",
-                                            "loc": null,
-                                            "children": {
-                                              "value": "String"
-                                            }
-                                          }
-                                        }
-                                      },
-                                      "tys": {
-                                        "kind": "Type::Name::TypeList",
-                                        "loc": null,
-                                        "children": []
-                                      }
-                                    }
-                                  },
-                                  {
-                                    "kind": "Type::Name",
-                                    "loc": null,
-                                    "children": {
-                                      "constr_id": {
-                                        "kind": "ConstrId",
-                                        "loc": null,
-                                        "children": {
-                                          "id": {
-                                            "kind": "LongIdent::Ident",
-                                            "loc": null,
-                                            "children": {
-                                              "value": "Int"
-                                            }
-                                          }
-                                        }
-                                      },
-                                      "tys": {
-                                        "kind": "Type::Name::TypeList",
-                                        "loc": null,
-                                        "children": []
-                                      }
-                                    }
-                                  }
-                                ]
-                              }
-                            }
-                          }
-                        ]
-                      }
-                    }
-                  }
-                }
-              },
-              "expr": {
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-                "loc": null,
-                "children": {
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-                    "loc": null,
-                    "children": []
-                  }
-                }
-              },
-              "body": {
-                "kind": "Expr::DotApply",
-                "loc": null,
-                "children": {
-                  "self": {
-                    "kind": "Expr::Ident",
-                    "loc": null,
-                    "children": {
-                      "id": {
-                        "kind": "Var",
-                        "loc": null,
-                        "children": {
-                          "name": {
-                            "kind": "LongIdent::Ident",
-                            "loc": null,
-                            "children": {
-                              "value": "body"
-                            }
-                          }
-                        }
-                      }
-                    }
-                  },
-                  "method_name": {
-                    "kind": "Label",
-                    "loc": null,
-                    "children": {
-                      "name": "push"
-                    }
-                  },
-                  "args": {
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-                    "loc": null,
-                    "children": [
-                      {
-                        "kind": "Argument",
-                        "loc": null,
-                        "children": {
-                          "value": {
-                            "kind": "Expr::Tuple",
-                            "loc": null,
-                            "children": {
-                              "exprs": {
-                                "kind": "Expr::Tuple::ExprList",
-                                "loc": null,
-                                "children": [
-                                  {
-                                    "kind": "Expr::MultilineString",
-                                    "loc": null,
-                                    "children": {
-                                      "elems": {
-                                        "kind": "Expr::MultilineString::ElemList",
-                                        "loc": null,
-                                        "children": [
-                                          {
-                                            "kind": "MultilineString::String",
-                                            "loc": null,
-                                            "children": {
-                                              "value": "x"
-                                            }
-                                          }
-                                        ]
-                                      }
-                                    }
-                                  },
-                                  {
-                                    "kind": "Expr::Constant",
-                                    "loc": null,
-                                    "children": {
-                                      "constant": {
-                                        "kind": "Constant::Int",
-                                        "loc": null,
-                                        "children": {
-                                          "value": "1"
-                                        }
-                                      }
-                                    }
-                                  }
-                                ]
-                              }
-                            }
-                          },
-                          "kind": {
-                            "kind": "ArgumentKind::Positional",
-                            "loc": null,
-                            "children": {}
-                          }
-                        }
-                      }
-                    ]
-                  },
-                  "return_self": false,
-                  "attr": {
-                    "kind": "ApplyAttr::NoAttr",
-                    "loc": null,
-                    "children": {}
-                  }
-                }
-              }
-            }
-          }
-        }
-      }
-    }
-  }
-]
\ No newline at end of file
diff --git a/test/sync_test/__snapshot__/parse_test_type_bang_no_payload.json b/test/sync_test/__snapshot__/parse_test_type_bang_no_payload.json
deleted file mode 100644
index 52b07fca..00000000
--- a/test/sync_test/__snapshot__/parse_test_type_bang_no_payload.json
+++ /dev/null
@@ -1,48 +0,0 @@
-[
-  {
-    "kind": "Impl::TopTypeDef",
-    "loc": null,
-    "children": {
-      "value": {
-        "kind": "TypeDecl",
-        "loc": null,
-        "children": {
-          "tycon": "E",
-          "params": {
-            "kind": "TypeDecl::ParamList",
-            "loc": null,
-            "children": []
-          },
-          "components": {
-            "kind": "TypeDesc::Error",
-            "loc": null,
-            "children": {
-              "value": {
-                "kind": "ExceptionDecl::NoPayload",
-                "loc": null,
-                "children": {}
-              }
-            }
-          },
-          "attrs": {
-            "kind": "TypeDecl::AttrList",
-            "loc": null,
-            "children": []
-          },
-          "doc": "",
-          "type_vis": {
-            "kind": "Visibility::Default",
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-            "children": {}
-          },
-          "is_declare": false,
-          "deriving": {
-            "kind": "TypeDecl::DerivingList",
-            "loc": null,
-            "children": []
-          }
-        }
-      }
-    }
-  }
-]
\ No newline at end of file
diff --git a/test/sync_test/__snapshot__/parse_test_typealias_lident_target_as.json b/test/sync_test/__snapshot__/parse_test_typealias_lident_target_as.json
deleted file mode 100644
index 098910a7..00000000
--- a/test/sync_test/__snapshot__/parse_test_typealias_lident_target_as.json
+++ /dev/null
@@ -1,47 +0,0 @@
-[
-  {
-    "kind": "Impl::BatchTypeAlias",
-    "loc": null,
-    "children": {
-      "pkg": null,
-      "targets": {
-        "kind": "Impl::BatchTypeAlias::TargetList",
-        "loc": null,
-        "children": [
-          {
-            "kind": "AliasTarget",
-            "loc": null,
-            "children": {
-              "binder": {
-                "kind": "Binder",
-                "loc": null,
-                "children": {
-                  "name": "Bar"
-                }
-              },
-              "target": {
-                "kind": "Label",
-                "loc": null,
-                "children": {
-                  "name": "foo"
-                }
-              }
-            }
-          }
-        ]
-      },
-      "vis": {
-        "kind": "Visibility::Default",
-        "loc": null,
-        "children": {}
-      },
-      "attrs": {
-        "kind": "Impl::BatchTypeAlias::AttrList",
-        "loc": null,
-        "children": []
-      },
-      "is_list": false,
-      "doc": ""
-    }
-  }
-]
\ No newline at end of file
diff --git a/test/sync_test/__snapshot__/pipeline_test_async_and_err.json b/test/sync_test/__snapshot__/pipeline_test_async_and_err.json
index cc02f411..2d4edb5a 100644
--- a/test/sync_test/__snapshot__/pipeline_test_async_and_err.json
+++ b/test/sync_test/__snapshot__/pipeline_test_async_and_err.json
@@ -1737,157 +1737,168 @@
                                 "children": []
                               },
                               "body": {
-                                "kind": "Expr::Try",
+                                "kind": "Expr::Group",
                                 "loc": null,
                                 "children": {
-                                  "body": {
-                                    "kind": "Expr::Group",
+                                  "expr": {
+                                    "kind": "Expr::Try",
                                     "loc": null,
                                     "children": {
-                                      "expr": {
-                                        "kind": "Expr::Apply",
+                                      "body": {
+                                        "kind": "Expr::Group",
                                         "loc": null,
                                         "children": {
-                                          "func": {
-                                            "kind": "Expr::Ident",
+                                          "expr": {
+                                            "kind": "Expr::Apply",
                                             "loc": null,
                                             "children": {
-                                              "id": {
-                                                "kind": "Var",
+                                              "func": {
+                                                "kind": "Expr::Ident",
                                                 "loc": null,
                                                 "children": {
-                                                  "name": {
-                                                    "kind": "LongIdent::Ident",
+                                                  "id": {
+                                                    "kind": "Var",
                                                     "loc": null,
                                                     "children": {
-                                                      "value": "async_with_err_non_tail"
+                                                      "name": {
+                                                        "kind": "LongIdent::Ident",
+                                                        "loc": null,
+                                                        "children": {
+                                                          "value": "async_with_err_non_tail"
+                                                        }
+                                                      }
                                                     }
                                                   }
                                                 }
+                                              },
+                                              "args": {
+                                                "kind": "Expr::Apply::ArgumentList",
+                                                "loc": null,
+                                                "children": []
+                                              },
+                                              "attr": {
+                                                "kind": "ApplyAttr::NoAttr",
+                                                "loc": null,
+                                                "children": {}
                                               }
                                             }
                                           },
-                                          "args": {
-                                            "kind": "Expr::Apply::ArgumentList",
-                                            "loc": null,
-                                            "children": []
-                                          },
-                                          "attr": {
-                                            "kind": "ApplyAttr::NoAttr",
+                                          "group": {
+                                            "kind": "Group::Brace",
                                             "loc": null,
                                             "children": {}
                                           }
                                         }
                                       },
-                                      "group": {
-                                        "kind": "Group::Brace",
-                                        "loc": null,
-                                        "children": {}
-                                      }
-                                    }
-                                  },
-                                  "catch": {
-                                    "kind": "Expr::Try::CaseList",
-                                    "loc": null,
-                                    "children": [
-                                      {
-                                        "kind": "Case",
+                                      "catch": {
+                                        "kind": "Expr::Try::CaseList",
                                         "loc": null,
-                                        "children": {
-                                          "pattern": {
-                                            "kind": "Pattern::Var",
+                                        "children": [
+                                          {
+                                            "kind": "Case",
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                                             "children": {
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-                                                "kind": "Binder",
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                                                 "loc": null,
                                                 "children": {
-                                                  "name": "err"
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+                                                      "name": "err"
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-                                                                }
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-                                                              {
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-                                                                "children": {
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                                                           }
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-                                                        "children": {}
                                                       }
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                                                   }
-                                                ]
-                                              },
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-                                                "kind": "ApplyAttr::NoAttr",
-                                                "loc": null,
-                                                "children": {}
+                                                }
                                               }
                                             }
                                           }
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-                                      }
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@@ -1897,7 +1908,7 @@
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                               },
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-                                "kind": "FnKind::Lambda",
+                                "kind": "FnKind::Arrow",
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                               },
@@ -2598,103 +2609,18 @@
                                 "children": []
                               },
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-                                "kind": "Expr::Try",
+                                "kind": "Expr::Group",
                                 "loc": null,
                                 "children": {
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-                                    "kind": "Expr::Group",
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                                     "loc": null,
                                     "children": {
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-                                                    "children": {
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-                                                    }
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-                                    "children": [
-                                      {
-                                        "kind": "Case",
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                                         "loc": null,
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-                                              }
-                                            }
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-                                          "body": {
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@@ -2710,7 +2636,7 @@
                                                         "kind": "LongIdent::Ident",
                                                         "loc": null,
                                                         "children": {
-                                                          "value": "println"
+                                                          "value": "async_with_tail_err_in_if"
                                                         }
                                                       }
                                                     }
@@ -2726,28 +2652,15 @@
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                                                     "children": {
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-                                                        "kind": "Expr::Interp",
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                                                         "loc": null,
                                                         "children": {
-                                                          "elems": {
-                                                            "kind": "Expr::Interp::ElemList",
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                                                             "loc": null,
-                                                            "children": [
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-                                                                "children": {
-                                                                  "source": "err"
-                                                                }
-                                                              }
-                                                            ]
+                                                            "children": {
+                                                              "value": true
+                                                            }
                                                           }
                                                         }
                                                       },
@@ -2766,14 +2679,123 @@
                                                 "children": {}
                                               }
                                             }
+                                          },
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                                           }
                                         }
-                                      }
-                                    ]
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                                   },
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@@ -2783,7 +2805,7 @@
                                 "children": {}
                               },
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@@ -3391,103 +3413,18 @@
                                 "children": []
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@@ -3503,7 +3440,7 @@
                                                         "kind": "LongIdent::Ident",
                                                         "loc": null,
                                                         "children": {
-                                                          "value": "println"
+                                                          "value": "async_with_tail_err_obj_method"
                                                         }
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@@ -3519,28 +3456,15 @@
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+                                                            "children": {
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+                                                            }
                                                           }
                                                         }
                                                       },
@@ -3559,68 +3483,177 @@
                                                 "children": {}
                                               }
                                             }
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+            }
           },
           "has_error": null,
           "is_async": {
@@ -4296,7 +4329,671 @@
                                 "children": {}
                               },
                               "kind": {
-                                "kind": "FnKind::Lambda",
+                                "kind": "FnKind::Arrow",
+                                "loc": null,
+                                "children": {}
+                              },
+                              "has_error": null,
+                              "is_async": null
+                            }
+                          }
+                        }
+                      },
+                      "kind": {
+                        "kind": "ArgumentKind::Positional",
+                        "loc": null,
+                        "children": {}
+                      }
+                    }
+                  }
+                ]
+              },
+              "attr": {
+                "kind": "ApplyAttr::NoAttr",
+                "loc": null,
+                "children": {}
+              }
+            }
+          }
+        }
+      }
+    }
+  },
+  {
+    "kind": "Impl::TopFuncDef",
+    "loc": null,
+    "children": {
+      "fun_decl": {
+        "kind": "FunDecl",
+        "loc": null,
+        "children": {
+          "type_name": null,
+          "name": {
+            "kind": "Binder",
+            "loc": null,
+            "children": {
+              "name": "sync_with_err_and_arg"
+            }
+          },
+          "has_error": null,
+          "is_async": null,
+          "decl_params": {
+            "kind": "FunDecl::ParameterList",
+            "loc": null,
+            "children": [
+              {
+                "kind": "Parameter::DiscardPositional",
+                "loc": null,
+                "children": {
+                  "ty": {
+                    "kind": "Type::Name",
+                    "loc": null,
+                    "children": {
+                      "constr_id": {
+                        "kind": "ConstrId",
+                        "loc": null,
+                        "children": {
+                          "id": {
+                            "kind": "LongIdent::Ident",
+                            "loc": null,
+                            "children": {
+                              "value": "Unit"
+                            }
+                          }
+                        }
+                      },
+                      "tys": {
+                        "kind": "Type::Name::TypeList",
+                        "loc": null,
+                        "children": []
+                      }
+                    }
+                  }
+                }
+              }
+            ]
+          },
+          "quantifiers": {
+            "kind": "FunDecl::QuantifierList",
+            "loc": null,
+            "children": []
+          },
+          "return_type": {
+            "kind": "Type::Name",
+            "loc": null,
+            "children": {
+              "constr_id": {
+                "kind": "ConstrId",
+                "loc": null,
+                "children": {
+                  "id": {
+                    "kind": "LongIdent::Ident",
+                    "loc": null,
+                    "children": {
+                      "value": "Unit"
+                    }
+                  }
+                }
+              },
+              "tys": {
+                "kind": "Type::Name::TypeList",
+                "loc": null,
+                "children": []
+              }
+            }
+          },
+          "error_type": {
+            "kind": "ErrorType::DefaultErrorType",
+            "loc": null,
+            "children": {}
+          },
+          "vis": {
+            "kind": "Visibility::Default",
+            "loc": null,
+            "children": {}
+          },
+          "attrs": {
+            "kind": "FunDecl::AttrList",
+            "loc": null,
+            "children": []
+          },
+          "doc": ""
+        }
+      },
+      "decl_body": {
+        "kind": "DeclBody::DeclBody",
+        "loc": null,
+        "children": {
+          "local_types": {
+            "kind": "DeclBody::DeclBody::LocalTypeList",
+            "loc": null,
+            "children": []
+          },
+          "expr": {
+            "kind": "Expr::Apply",
+            "loc": null,
+            "children": {
+              "func": {
+                "kind": "Expr::Ident",
+                "loc": null,
+                "children": {
+                  "id": {
+                    "kind": "Var",
+                    "loc": null,
+                    "children": {
+                      "name": {
+                        "kind": "LongIdent::Ident",
+                        "loc": null,
+                        "children": {
+                          "value": "sync_with_err"
+                        }
+                      }
+                    }
+                  }
+                }
+              },
+              "args": {
+                "kind": "Expr::Apply::ArgumentList",
+                "loc": null,
+                "children": []
+              },
+              "attr": {
+                "kind": "ApplyAttr::NoAttr",
+                "loc": null,
+                "children": {}
+              }
+            }
+          }
+        }
+      }
+    }
+  },
+  {
+    "kind": "Impl::TopFuncDef",
+    "loc": null,
+    "children": {
+      "fun_decl": {
+        "kind": "FunDecl",
+        "loc": null,
+        "children": {
+          "type_name": null,
+          "name": {
+            "kind": "Binder",
+            "loc": null,
+            "children": {
+              "name": "raise_to_async_handler_in_arg"
+            }
+          },
+          "has_error": null,
+          "is_async": {
+            "kind": "Async",
+            "loc": null,
+            "children": {}
+          },
+          "decl_params": {
+            "kind": "FunDecl::ParameterList",
+            "loc": null,
+            "children": []
+          },
+          "quantifiers": {
+            "kind": "FunDecl::QuantifierList",
+            "loc": null,
+            "children": []
+          },
+          "return_type": {
+            "kind": "Type::Name",
+            "loc": null,
+            "children": {
+              "constr_id": {
+                "kind": "ConstrId",
+                "loc": null,
+                "children": {
+                  "id": {
+                    "kind": "LongIdent::Ident",
+                    "loc": null,
+                    "children": {
+                      "value": "Unit"
+                    }
+                  }
+                }
+              },
+              "tys": {
+                "kind": "Type::Name::TypeList",
+                "loc": null,
+                "children": []
+              }
+            }
+          },
+          "error_type": {
+            "kind": "ErrorType::NoErrorType",
+            "loc": null,
+            "children": {}
+          },
+          "vis": {
+            "kind": "Visibility::Default",
+            "loc": null,
+            "children": {}
+          },
+          "attrs": {
+            "kind": "FunDecl::AttrList",
+            "loc": null,
+            "children": []
+          },
+          "doc": ""
+        }
+      },
+      "decl_body": {
+        "kind": "DeclBody::DeclBody",
+        "loc": null,
+        "children": {
+          "local_types": {
+            "kind": "DeclBody::DeclBody::LocalTypeList",
+            "loc": null,
+            "children": []
+          },
+          "expr": {
+            "kind": "Expr::Try",
+            "loc": null,
+            "children": {
+              "body": {
+                "kind": "Expr::Group",
+                "loc": null,
+                "children": {
+                  "expr": {
+                    "kind": "Expr::Apply",
+                    "loc": null,
+                    "children": {
+                      "func": {
+                        "kind": "Expr::Ident",
+                        "loc": null,
+                        "children": {
+                          "id": {
+                            "kind": "Var",
+                            "loc": null,
+                            "children": {
+                              "name": {
+                                "kind": "LongIdent::Ident",
+                                "loc": null,
+                                "children": {
+                                  "value": "println"
+                                }
+                              }
+                            }
+                          }
+                        }
+                      },
+                      "args": {
+                        "kind": "Expr::Apply::ArgumentList",
+                        "loc": null,
+                        "children": [
+                          {
+                            "kind": "Argument",
+                            "loc": null,
+                            "children": {
+                              "value": {
+                                "kind": "Expr::Apply",
+                                "loc": null,
+                                "children": {
+                                  "func": {
+                                    "kind": "Expr::Ident",
+                                    "loc": null,
+                                    "children": {
+                                      "id": {
+                                        "kind": "Var",
+                                        "loc": null,
+                                        "children": {
+                                          "name": {
+                                            "kind": "LongIdent::Ident",
+                                            "loc": null,
+                                            "children": {
+                                              "value": "sync_with_err_and_arg"
+                                            }
+                                          }
+                                        }
+                                      }
+                                    }
+                                  },
+                                  "args": {
+                                    "kind": "Expr::Apply::ArgumentList",
+                                    "loc": null,
+                                    "children": [
+                                      {
+                                        "kind": "Argument",
+                                        "loc": null,
+                                        "children": {
+                                          "value": {
+                                            "kind": "Expr::Apply",
+                                            "loc": null,
+                                            "children": {
+                                              "func": {
+                                                "kind": "Expr::Ident",
+                                                "loc": null,
+                                                "children": {
+                                                  "id": {
+                                                    "kind": "Var",
+                                                    "loc": null,
+                                                    "children": {
+                                                      "name": {
+                                                        "kind": "LongIdent::Ident",
+                                                        "loc": null,
+                                                        "children": {
+                                                          "value": "sync_with_err"
+                                                        }
+                                                      }
+                                                    }
+                                                  }
+                                                }
+                                              },
+                                              "args": {
+                                                "kind": "Expr::Apply::ArgumentList",
+                                                "loc": null,
+                                                "children": []
+                                              },
+                                              "attr": {
+                                                "kind": "ApplyAttr::NoAttr",
+                                                "loc": null,
+                                                "children": {}
+                                              }
+                                            }
+                                          },
+                                          "kind": {
+                                            "kind": "ArgumentKind::Positional",
+                                            "loc": null,
+                                            "children": {}
+                                          }
+                                        }
+                                      }
+                                    ]
+                                  },
+                                  "attr": {
+                                    "kind": "ApplyAttr::NoAttr",
+                                    "loc": null,
+                                    "children": {}
+                                  }
+                                }
+                              },
+                              "kind": {
+                                "kind": "ArgumentKind::Positional",
+                                "loc": null,
+                                "children": {}
+                              }
+                            }
+                          }
+                        ]
+                      },
+                      "attr": {
+                        "kind": "ApplyAttr::NoAttr",
+                        "loc": null,
+                        "children": {}
+                      }
+                    }
+                  },
+                  "group": {
+                    "kind": "Group::Brace",
+                    "loc": null,
+                    "children": {}
+                  }
+                }
+              },
+              "catch": {
+                "kind": "Expr::Try::CaseList",
+                "loc": null,
+                "children": [
+                  {
+                    "kind": "Case",
+                    "loc": null,
+                    "children": {
+                      "pattern": {
+                        "kind": "Pattern::Any",
+                        "loc": null,
+                        "children": {}
+                      },
+                      "guard": null,
+                      "body": {
+                        "kind": "Expr::Apply",
+                        "loc": null,
+                        "children": {
+                          "func": {
+                            "kind": "Expr::Ident",
+                            "loc": null,
+                            "children": {
+                              "id": {
+                                "kind": "Var",
+                                "loc": null,
+                                "children": {
+                                  "name": {
+                                    "kind": "LongIdent::Ident",
+                                    "loc": null,
+                                    "children": {
+                                      "value": "async_with_err"
+                                    }
+                                  }
+                                }
+                              }
+                            }
+                          },
+                          "args": {
+                            "kind": "Expr::Apply::ArgumentList",
+                            "loc": null,
+                            "children": []
+                          },
+                          "attr": {
+                            "kind": "ApplyAttr::NoAttr",
+                            "loc": null,
+                            "children": {}
+                          }
+                        }
+                      }
+                    }
+                  }
+                ]
+              },
+              "catch_all": false,
+              "try_else": null,
+              "has_try": true
+            }
+          }
+        }
+      }
+    }
+  },
+  {
+    "kind": "Impl::TopFuncDef",
+    "loc": null,
+    "children": {
+      "fun_decl": {
+        "kind": "FunDecl",
+        "loc": null,
+        "children": {
+          "type_name": null,
+          "name": {
+            "kind": "Binder",
+            "loc": null,
+            "children": {
+              "name": "init"
+            }
+          },
+          "has_error": null,
+          "is_async": null,
+          "decl_params": null,
+          "quantifiers": {
+            "kind": "FunDecl::QuantifierList",
+            "loc": null,
+            "children": []
+          },
+          "return_type": null,
+          "error_type": {
+            "kind": "ErrorType::NoErrorType",
+            "loc": null,
+            "children": {}
+          },
+          "vis": {
+            "kind": "Visibility::Default",
+            "loc": null,
+            "children": {}
+          },
+          "attrs": {
+            "kind": "FunDecl::AttrList",
+            "loc": null,
+            "children": []
+          },
+          "doc": ""
+        }
+      },
+      "decl_body": {
+        "kind": "DeclBody::DeclBody",
+        "loc": null,
+        "children": {
+          "local_types": {
+            "kind": "DeclBody::DeclBody::LocalTypeList",
+            "loc": null,
+            "children": []
+          },
+          "expr": {
+            "kind": "Expr::Apply",
+            "loc": null,
+            "children": {
+              "func": {
+                "kind": "Expr::Ident",
+                "loc": null,
+                "children": {
+                  "id": {
+                    "kind": "Var",
+                    "loc": null,
+                    "children": {
+                      "name": {
+                        "kind": "LongIdent::Ident",
+                        "loc": null,
+                        "children": {
+                          "value": "run_async"
+                        }
+                      }
+                    }
+                  }
+                }
+              },
+              "args": {
+                "kind": "Expr::Apply::ArgumentList",
+                "loc": null,
+                "children": [
+                  {
+                    "kind": "Argument",
+                    "loc": null,
+                    "children": {
+                      "value": {
+                        "kind": "Expr::Function",
+                        "loc": null,
+                        "children": {
+                          "func": {
+                            "kind": "Func::Lambda",
+                            "loc": null,
+                            "children": {
+                              "parameters": {
+                                "kind": "Func::Lambda::ParameterList",
+                                "loc": null,
+                                "children": []
+                              },
+                              "body": {
+                                "kind": "Expr::Apply",
+                                "loc": null,
+                                "children": {
+                                  "func": {
+                                    "kind": "Expr::Ident",
+                                    "loc": null,
+                                    "children": {
+                                      "id": {
+                                        "kind": "Var",
+                                        "loc": null,
+                                        "children": {
+                                          "name": {
+                                            "kind": "LongIdent::Ident",
+                                            "loc": null,
+                                            "children": {
+                                              "value": "println"
+                                            }
+                                          }
+                                        }
+                                      }
+                                    }
+                                  },
+                                  "args": {
+                                    "kind": "Expr::Apply::ArgumentList",
+                                    "loc": null,
+                                    "children": [
+                                      {
+                                        "kind": "Argument",
+                                        "loc": null,
+                                        "children": {
+                                          "value": {
+                                            "kind": "Expr::TryOperator",
+                                            "loc": null,
+                                            "children": {
+                                              "body": {
+                                                "kind": "Expr::Apply",
+                                                "loc": null,
+                                                "children": {
+                                                  "func": {
+                                                    "kind": "Expr::Ident",
+                                                    "loc": null,
+                                                    "children": {
+                                                      "id": {
+                                                        "kind": "Var",
+                                                        "loc": null,
+                                                        "children": {
+                                                          "name": {
+                                                            "kind": "LongIdent::Ident",
+                                                            "loc": null,
+                                                            "children": {
+                                                              "value": "raise_to_async_handler_in_arg"
+                                                            }
+                                                          }
+                                                        }
+                                                      }
+                                                    }
+                                                  },
+                                                  "args": {
+                                                    "kind": "Expr::Apply::ArgumentList",
+                                                    "loc": null,
+                                                    "children": []
+                                                  },
+                                                  "attr": {
+                                                    "kind": "ApplyAttr::NoAttr",
+                                                    "loc": null,
+                                                    "children": {}
+                                                  }
+                                                }
+                                              },
+                                              "kind": {
+                                                "kind": "TryOperatorKind::Question",
+                                                "loc": null,
+                                                "children": {}
+                                              }
+                                            }
+                                          },
+                                          "kind": {
+                                            "kind": "ArgumentKind::Positional",
+                                            "loc": null,
+                                            "children": {}
+                                          }
+                                        }
+                                      }
+                                    ]
+                                  },
+                                  "attr": {
+                                    "kind": "ApplyAttr::NoAttr",
+                                    "loc": null,
+                                    "children": {}
+                                  }
+                                }
+                              },
+                              "return_type": null,
+                              "error_type": {
+                                "kind": "ErrorType::NoErrorType",
+                                "loc": null,
+                                "children": {}
+                              },
+                              "kind": {
+                                "kind": "FnKind::Arrow",
                                 "loc": null,
                                 "children": {}
                               },
diff --git a/test/sync_test/__snapshot__/pipeline_test_async_and_err.mbt b/test/sync_test/__snapshot__/pipeline_test_async_and_err.mbt
index cdb55903..1010b33f 100644
--- a/test/sync_test/__snapshot__/pipeline_test_async_and_err.mbt
+++ b/test/sync_test/__snapshot__/pipeline_test_async_and_err.mbt
@@ -37,7 +37,7 @@ async fn async_with_err_non_tail() -> Unit raise {
 }
 
 fn init {
-  run_async(fn () {
+  run_async(() => {
     try {
       async_with_err_non_tail()
     } catch {
@@ -65,7 +65,7 @@ async fn async_with_tail_err_in_if(c : Bool) -> Unit raise Err {
 }
 
 fn init {
-  run_async(fn () {
+  run_async(() => {
     try {
       async_with_tail_err_in_if(true)
     } catch {
@@ -87,7 +87,7 @@ async fn async_with_tail_err_obj_method(obj : &Obj_with_err) -> Unit raise Err {
 }
 
 fn init {
-  run_async(fn () {
+  run_async(() => {
     try {
       async_with_tail_err_obj_method(42)
     } catch {
@@ -109,5 +109,21 @@ async fn raise_in_sync_with_async_catch(input : String?) -> Unit {
 }
 
 fn init {
-  run_async(fn() { try! raise_in_sync_with_async_catch(Some("msg")) })
+  run_async(() => try! raise_in_sync_with_async_catch(Some("msg")))
+}
+
+fn sync_with_err_and_arg(_ : Unit) -> Unit raise {
+  sync_with_err()
+}
+
+async fn raise_to_async_handler_in_arg() -> Unit {
+  try {
+    println(sync_with_err_and_arg(sync_with_err()))
+  } catch {
+    _ => async_with_err()
+  }
+}
+
+fn init {
+  run_async(() => println(try? raise_to_async_handler_in_arg()))
 }
diff --git a/test/sync_test/__snapshot__/pipeline_test_async_and_err.mbt.tokens.json b/test/sync_test/__snapshot__/pipeline_test_async_and_err.mbt.tokens.json
index bb59e1f1..6f3f7db2 100644
--- a/test/sync_test/__snapshot__/pipeline_test_async_and_err.mbt.tokens.json
+++ b/test/sync_test/__snapshot__/pipeline_test_async_and_err.mbt.tokens.json
@@ -1026,17 +1026,17 @@
     "token": "LPAREN",
     "loc": "40:12-40:13"
   },
-  {
-    "token": "FN",
-    "loc": "40:13-40:15"
-  },
   {
     "token": "LPAREN",
-    "loc": "40:16-40:17"
+    "loc": "40:13-40:14"
   },
   {
     "token": "RPAREN",
-    "loc": "40:17-40:18"
+    "loc": "40:14-40:15"
+  },
+  {
+    "token": "FAT_ARROW",
+    "loc": "40:16-40:18"
   },
   {
     "token": "LBRACE",
@@ -1556,17 +1556,17 @@
     "token": "LPAREN",
     "loc": "68:12-68:13"
   },
-  {
-    "token": "FN",
-    "loc": "68:13-68:15"
-  },
   {
     "token": "LPAREN",
-    "loc": "68:16-68:17"
+    "loc": "68:13-68:14"
   },
   {
     "token": "RPAREN",
-    "loc": "68:17-68:18"
+    "loc": "68:14-68:15"
+  },
+  {
+    "token": "FAT_ARROW",
+    "loc": "68:16-68:18"
   },
   {
     "token": "LBRACE",
@@ -2029,17 +2029,17 @@
     "token": "LPAREN",
     "loc": "90:12-90:13"
   },
-  {
-    "token": "FN",
-    "loc": "90:13-90:15"
-  },
   {
     "token": "LPAREN",
-    "loc": "90:16-90:17"
+    "loc": "90:13-90:14"
   },
   {
     "token": "RPAREN",
-    "loc": "90:17-90:18"
+    "loc": "90:14-90:15"
+  },
+  {
+    "token": "FAT_ARROW",
+    "loc": "90:16-90:18"
   },
   {
     "token": "LBRACE",
@@ -2500,54 +2500,54 @@
     "token": "LPAREN",
     "loc": "112:12-112:13"
   },
-  {
-    "token": "FN",
-    "loc": "112:13-112:15"
-  },
   {
     "token": "LPAREN",
-    "loc": "112:15-112:16"
+    "loc": "112:13-112:14"
   },
   {
     "token": "RPAREN",
-    "loc": "112:16-112:17"
+    "loc": "112:14-112:15"
   },
   {
-    "token": "LBRACE",
-    "loc": "112:18-112:19"
+    "token": "FAT_ARROW",
+    "loc": "112:16-112:18"
   },
   {
     "token": "TRY_EXCLAMATION",
-    "loc": "112:20-112:24"
+    "loc": "112:19-112:23"
   },
   {
     "token": [
       "LIDENT",
       "raise_in_sync_with_async_catch"
     ],
-    "loc": "112:25-112:55"
+    "loc": "112:24-112:54"
   },
   {
     "token": "LPAREN",
-    "loc": "112:55-112:56"
+    "loc": "112:54-112:55"
   },
   {
     "token": [
       "UIDENT",
       "Some"
     ],
-    "loc": "112:56-112:60"
+    "loc": "112:55-112:59"
   },
   {
     "token": "LPAREN",
-    "loc": "112:60-112:61"
+    "loc": "112:59-112:60"
   },
   {
     "token": [
       "STRING",
       "msg"
     ],
-    "loc": "112:61-112:66"
+    "loc": "112:60-112:65"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "112:65-112:66"
   },
   {
     "token": "RPAREN",
@@ -2557,35 +2557,398 @@
     "token": "RPAREN",
     "loc": "112:67-112:68"
   },
+  {
+    "token": "NEWLINE",
+    "loc": "112:68-112:69"
+  },
   {
     "token": "RBRACE",
-    "loc": "112:69-112:70"
+    "loc": "113:1-113:2"
+  },
+  {
+    "token": [
+      "SEMI",
+      false
+    ],
+    "loc": "113:2-113:2"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "113:2-113:3"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "114:1-114:2"
+  },
+  {
+    "token": "FN",
+    "loc": "115:1-115:3"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "sync_with_err_and_arg"
+    ],
+    "loc": "115:4-115:25"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "115:25-115:26"
+  },
+  {
+    "token": "UNDERSCORE",
+    "loc": "115:26-115:27"
+  },
+  {
+    "token": "COLON",
+    "loc": "115:28-115:29"
+  },
+  {
+    "token": [
+      "UIDENT",
+      "Unit"
+    ],
+    "loc": "115:30-115:34"
   },
   {
     "token": "RPAREN",
-    "loc": "112:70-112:71"
+    "loc": "115:34-115:35"
+  },
+  {
+    "token": "THIN_ARROW",
+    "loc": "115:36-115:38"
+  },
+  {
+    "token": [
+      "UIDENT",
+      "Unit"
+    ],
+    "loc": "115:39-115:43"
+  },
+  {
+    "token": "RAISE",
+    "loc": "115:44-115:49"
+  },
+  {
+    "token": "LBRACE",
+    "loc": "115:50-115:51"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "115:51-115:52"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "sync_with_err"
+    ],
+    "loc": "116:3-116:16"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "116:16-116:17"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "116:17-116:18"
   },
   {
     "token": "NEWLINE",
-    "loc": "112:71-112:72"
+    "loc": "116:18-116:19"
   },
   {
     "token": "RBRACE",
-    "loc": "113:1-113:2"
+    "loc": "117:1-117:2"
   },
   {
     "token": [
       "SEMI",
       false
     ],
-    "loc": "113:2-113:2"
+    "loc": "117:2-117:2"
   },
   {
     "token": "NEWLINE",
-    "loc": "113:2-113:3"
+    "loc": "117:2-117:3"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "118:1-118:2"
+  },
+  {
+    "token": "ASYNC",
+    "loc": "119:1-119:6"
+  },
+  {
+    "token": "FN",
+    "loc": "119:7-119:9"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "raise_to_async_handler_in_arg"
+    ],
+    "loc": "119:10-119:39"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "119:39-119:40"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "119:40-119:41"
+  },
+  {
+    "token": "THIN_ARROW",
+    "loc": "119:42-119:44"
+  },
+  {
+    "token": [
+      "UIDENT",
+      "Unit"
+    ],
+    "loc": "119:45-119:49"
+  },
+  {
+    "token": "LBRACE",
+    "loc": "119:50-119:51"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "119:51-119:52"
+  },
+  {
+    "token": "TRY",
+    "loc": "120:3-120:6"
+  },
+  {
+    "token": "LBRACE",
+    "loc": "120:7-120:8"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "120:8-120:9"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "println"
+    ],
+    "loc": "121:5-121:12"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "121:12-121:13"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "sync_with_err_and_arg"
+    ],
+    "loc": "121:13-121:34"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "121:34-121:35"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "sync_with_err"
+    ],
+    "loc": "121:35-121:48"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "121:48-121:49"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "121:49-121:50"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "121:50-121:51"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "121:51-121:52"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "121:52-121:53"
+  },
+  {
+    "token": "RBRACE",
+    "loc": "122:3-122:4"
+  },
+  {
+    "token": "CATCH",
+    "loc": "122:5-122:10"
+  },
+  {
+    "token": "LBRACE",
+    "loc": "122:11-122:12"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "122:12-122:13"
+  },
+  {
+    "token": "UNDERSCORE",
+    "loc": "123:5-123:6"
+  },
+  {
+    "token": "FAT_ARROW",
+    "loc": "123:7-123:9"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "async_with_err"
+    ],
+    "loc": "123:10-123:24"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "123:24-123:25"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "123:25-123:26"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "123:26-123:27"
+  },
+  {
+    "token": "RBRACE",
+    "loc": "124:3-124:4"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "124:4-124:5"
+  },
+  {
+    "token": "RBRACE",
+    "loc": "125:1-125:2"
+  },
+  {
+    "token": [
+      "SEMI",
+      false
+    ],
+    "loc": "125:2-125:2"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "125:2-125:3"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "126:1-126:2"
+  },
+  {
+    "token": "FN",
+    "loc": "127:1-127:3"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "init"
+    ],
+    "loc": "127:4-127:8"
+  },
+  {
+    "token": "LBRACE",
+    "loc": "127:9-127:10"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "127:10-127:11"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "run_async"
+    ],
+    "loc": "128:3-128:12"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "128:12-128:13"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "128:13-128:14"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "128:14-128:15"
+  },
+  {
+    "token": "FAT_ARROW",
+    "loc": "128:16-128:18"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "println"
+    ],
+    "loc": "128:19-128:26"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "128:26-128:27"
+  },
+  {
+    "token": "TRY_QUESTION",
+    "loc": "128:27-128:31"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "raise_to_async_handler_in_arg"
+    ],
+    "loc": "128:32-128:61"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "128:61-128:62"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "128:62-128:63"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "128:63-128:64"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "128:64-128:65"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "128:65-128:66"
+  },
+  {
+    "token": "RBRACE",
+    "loc": "129:1-129:2"
+  },
+  {
+    "token": [
+      "SEMI",
+      false
+    ],
+    "loc": "129:2-129:2"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "129:2-129:3"
   },
   {
     "token": "EOF",
-    "loc": "114:1-114:1"
+    "loc": "130:1-130:1"
   }
 ]
\ No newline at end of file
diff --git a/test/sync_test/__snapshot__/pipeline_test_async_fn_in_array.json b/test/sync_test/__snapshot__/pipeline_test_async_fn_in_array.json
index e0e810c2..49a6792d 100644
--- a/test/sync_test/__snapshot__/pipeline_test_async_fn_in_array.json
+++ b/test/sync_test/__snapshot__/pipeline_test_async_fn_in_array.json
@@ -1087,7 +1087,7 @@
                               }
                             ]
                           },
-                          "return_self": true,
+                          "return_self": false,
                           "attr": {
                             "kind": "ApplyAttr::NoAttr",
                             "loc": null,
@@ -1641,7 +1641,7 @@
                                       }
                                     ]
                                   },
-                                  "return_self": true,
+                                  "return_self": false,
                                   "attr": {
                                     "kind": "ApplyAttr::NoAttr",
                                     "loc": null,
diff --git a/test/sync_test/__snapshot__/pipeline_test_async_fn_in_array.mbt b/test/sync_test/__snapshot__/pipeline_test_async_fn_in_array.mbt
index 9d0f8de0..0eb0b840 100644
--- a/test/sync_test/__snapshot__/pipeline_test_async_fn_in_array.mbt
+++ b/test/sync_test/__snapshot__/pipeline_test_async_fn_in_array.mbt
@@ -7,12 +7,12 @@ async fn async_id(x : Int) -> Int noraise {
 
 fn main {
   let arr1 : Array[() -> Unit] = []
-  arr1..push(() => println(1))..push(() => println(2))
+  arr1..push(() => println(1)).push(() => println(2))
   for f in arr1 {
     f()
   }
   let arr2 : Array[async () -> Unit noraise] = []
-  arr2..push(() => println(async_id(1)))..push(() => println(async_id(2)))
+  arr2..push(() => println(async_id(1))).push(() => println(async_id(2)))
   for f in arr2 {
     run_async(f)
   }
diff --git a/test/sync_test/__snapshot__/pipeline_test_async_fn_in_array.mbt.tokens.json b/test/sync_test/__snapshot__/pipeline_test_async_fn_in_array.mbt.tokens.json
index 29c671dd..87cbe019 100644
--- a/test/sync_test/__snapshot__/pipeline_test_async_fn_in_array.mbt.tokens.json
+++ b/test/sync_test/__snapshot__/pipeline_test_async_fn_in_array.mbt.tokens.json
@@ -510,69 +510,65 @@
     "token": "RPAREN",
     "loc": "10:30-10:31"
   },
-  {
-    "token": "DOTDOT",
-    "loc": "10:31-10:33"
-  },
   {
     "token": [
-      "LIDENT",
+      "DOT_LIDENT",
       "push"
     ],
-    "loc": "10:33-10:37"
+    "loc": "10:32-10:36"
   },
   {
     "token": "LPAREN",
-    "loc": "10:37-10:38"
+    "loc": "10:36-10:37"
   },
   {
     "token": "LPAREN",
-    "loc": "10:38-10:39"
+    "loc": "10:37-10:38"
   },
   {
     "token": "RPAREN",
-    "loc": "10:39-10:40"
+    "loc": "10:38-10:39"
   },
   {
     "token": "FAT_ARROW",
-    "loc": "10:41-10:43"
+    "loc": "10:40-10:42"
   },
   {
     "token": [
       "LIDENT",
       "println"
     ],
-    "loc": "10:44-10:51"
+    "loc": "10:43-10:50"
   },
   {
     "token": "LPAREN",
-    "loc": "10:51-10:52"
+    "loc": "10:50-10:51"
   },
   {
     "token": [
       "INT",
       "2"
     ],
-    "loc": "10:52-10:53"
+    "loc": "10:51-10:52"
   },
   {
     "token": "RPAREN",
-    "loc": "10:53-10:54"
+    "loc": "10:52-10:53"
   },
   {
     "token": "RPAREN",
-    "loc": "10:54-10:55"
+    "loc": "10:53-10:54"
   },
   {
     "token": [
       "SEMI",
       false
     ],
-    "loc": "10:55-10:55"
+    "loc": "10:54-10:54"
   },
   {
     "token": "NEWLINE",
-    "loc": "10:55-10:56"
+    "loc": "10:54-10:55"
   },
   {
     "token": "FOR",
@@ -793,84 +789,80 @@
     "token": "RPAREN",
     "loc": "15:40-15:41"
   },
-  {
-    "token": "DOTDOT",
-    "loc": "15:41-15:43"
-  },
   {
     "token": [
-      "LIDENT",
+      "DOT_LIDENT",
       "push"
     ],
-    "loc": "15:43-15:47"
+    "loc": "15:42-15:46"
   },
   {
     "token": "LPAREN",
-    "loc": "15:47-15:48"
+    "loc": "15:46-15:47"
   },
   {
     "token": "LPAREN",
-    "loc": "15:48-15:49"
+    "loc": "15:47-15:48"
   },
   {
     "token": "RPAREN",
-    "loc": "15:49-15:50"
+    "loc": "15:48-15:49"
   },
   {
     "token": "FAT_ARROW",
-    "loc": "15:51-15:53"
+    "loc": "15:50-15:52"
   },
   {
     "token": [
       "LIDENT",
       "println"
     ],
-    "loc": "15:54-15:61"
+    "loc": "15:53-15:60"
   },
   {
     "token": "LPAREN",
-    "loc": "15:61-15:62"
+    "loc": "15:60-15:61"
   },
   {
     "token": [
       "LIDENT",
       "async_id"
     ],
-    "loc": "15:62-15:70"
+    "loc": "15:61-15:69"
   },
   {
     "token": "LPAREN",
-    "loc": "15:70-15:71"
+    "loc": "15:69-15:70"
   },
   {
     "token": [
       "INT",
       "2"
     ],
-    "loc": "15:71-15:72"
+    "loc": "15:70-15:71"
   },
   {
     "token": "RPAREN",
-    "loc": "15:72-15:73"
+    "loc": "15:71-15:72"
   },
   {
     "token": "RPAREN",
-    "loc": "15:73-15:74"
+    "loc": "15:72-15:73"
   },
   {
     "token": "RPAREN",
-    "loc": "15:74-15:75"
+    "loc": "15:73-15:74"
   },
   {
     "token": [
       "SEMI",
       false
     ],
-    "loc": "15:75-15:75"
+    "loc": "15:74-15:74"
   },
   {
     "token": "NEWLINE",
-    "loc": "15:75-15:76"
+    "loc": "15:74-15:75"
   },
   {
     "token": "FOR",
diff --git a/test/sync_test/__snapshot__/pipeline_test_async_for.json b/test/sync_test/__snapshot__/pipeline_test_async_for.json
index fd06f299..98a6942a 100644
--- a/test/sync_test/__snapshot__/pipeline_test_async_for.json
+++ b/test/sync_test/__snapshot__/pipeline_test_async_for.json
@@ -1580,184 +1580,195 @@
                                                 "children": []
                                               },
                                               "body": {
-                                                "kind": "Expr::ForEach",
+                                                "kind": "Expr::Group",
                                                 "loc": null,
                                                 "children": {
-                                                  "binders": {
-                                                    "kind": "Expr::ForEach::BinderList",
-                                                    "loc": null,
-                                                    "children": [
-                                                      {
-                                                        "kind": "Binder",
-                                                        "loc": null,
-                                                        "children": {
-                                                          "name": "k"
-                                                        }
-                                                      },
-                                                      {
-                                                        "kind": "Binder",
-                                                        "loc": null,
-                                                        "children": {
-                                                          "name": "v"
-                                                        }
-                                                      }
-                                                    ]
-                                                  },
                                                   "expr": {
-                                                    "kind": "Expr::Ident",
+                                                    "kind": "Expr::ForEach",
                                                     "loc": null,
                                                     "children": {
-                                                      "id": {
-                                                        "kind": "Var",
+                                                      "binders": {
+                                                        "kind": "Expr::ForEach::BinderList",
+                                                        "loc": null,
+                                                        "children": [
+                                                          {
+                                                            "kind": "Binder",
+                                                            "loc": null,
+                                                            "children": {
+                                                              "name": "k"
+                                                            }
+                                                          },
+                                                          {
+                                                            "kind": "Binder",
+                                                            "loc": null,
+                                                            "children": {
+                                                              "name": "v"
+                                                            }
+                                                          }
+                                                        ]
+                                                      },
+                                                      "expr": {
+                                                        "kind": "Expr::Ident",
                                                         "loc": null,
                                                         "children": {
-                                                          "name": {
-                                                            "kind": "LongIdent::Ident",
+                                                          "id": {
+                                                            "kind": "Var",
                                                             "loc": null,
                                                             "children": {
-                                                              "value": "map"
+                                                              "name": {
+                                                                "kind": "LongIdent::Ident",
+                                                                "loc": null,
+                                                                "children": {
+                                                                  "value": "map"
+                                                                }
+                                                              }
                                                             }
                                                           }
                                                         }
-                                                      }
-                                                    }
-                                                  },
-                                                  "body": {
-                                                    "kind": "Expr::Sequence",
-                                                    "loc": null,
-                                                    "children": {
-                                                      "exprs": {
-                                                        "kind": "Expr::Sequence::ExprList",
+                                                      },
+                                                      "body": {
+                                                        "kind": "Expr::Sequence",
                                                         "loc": null,
-                                                        "children": [
-                                                          {
-                                                            "kind": "Expr::Apply",
+                                                        "children": {
+                                                          "exprs": {
+                                                            "kind": "Expr::Sequence::ExprList",
                                                             "loc": null,
-                                                            "children": {
-                                                              "func": {
-                                                                "kind": "Expr::Ident",
+                                                            "children": [
+                                                              {
+                                                                "kind": "Expr::Apply",
                                                                 "loc": null,
                                                                 "children": {
-                                                                  "id": {
-                                                                    "kind": "Var",
+                                                                  "func": {
+                                                                    "kind": "Expr::Ident",
                                                                     "loc": null,
                                                                     "children": {
-                                                                      "name": {
-                                                                        "kind": "LongIdent::Ident",
+                                                                      "id": {
+                                                                        "kind": "Var",
                                                                         "loc": null,
                                                                         "children": {
-                                                                          "value": "println"
+                                                                          "name": {
+                                                                            "kind": "LongIdent::Ident",
+                                                                            "loc": null,
+                                                                            "children": {
+                                                                              "value": "println"
+                                                                            }
+                                                                          }
                                                                         }
                                                                       }
                                                                     }
-                                                                  }
-                                                                }
-                                                              },
-                                                              "args": {
-                                                                "kind": "Expr::Apply::ArgumentList",
-                                                                "loc": null,
-                                                                "children": [
-                                                                  {
-                                                                    "kind": "Argument",
+                                                                  },
+                                                                  "args": {
+                                                                    "kind": "Expr::Apply::ArgumentList",
                                                                     "loc": null,
-                                                                    "children": {
-                                                                      "value": {
-                                                                        "kind": "Expr::Interp",
+                                                                    "children": [
+                                                                      {
+                                                                        "kind": "Argument",
                                                                         "loc": null,
                                                                         "children": {
-                                                                          "elems": {
-                                                                            "kind": "Expr::Interp::ElemList",
+                                                                          "value": {
+                                                                            "kind": "Expr::Interp",
                                                                             "loc": null,
-                                                                            "children": [
-                                                                              {
-                                                                                "kind": "InterpElem::Literal",
-                                                                                "loc": null,
-                                                                                "children": {
-                                                                                  "repr": "from map: "
-                                                                                }
-                                                                              },
-                                                                              {
-                                                                                "kind": "InterpElem::Source",
+                                                                            "children": {
+                                                                              "elems": {
+                                                                                "kind": "Expr::Interp::ElemList",
                                                                                 "loc": null,
-                                                                                "children": {
-                                                                                  "source": "k"
-                                                                                }
-                                                                              },
-                                                                              {
-                                                                                "kind": "InterpElem::Literal",
-                                                                                "loc": null,
-                                                                                "children": {
-                                                                                  "repr": " => "
-                                                                                }
-                                                                              },
-                                                                              {
-                                                                                "kind": "InterpElem::Source",
-                                                                                "loc": null,
-                                                                                "children": {
-                                                                                  "source": "v"
-                                                                                }
+                                                                                "children": [
+                                                                                  {
+                                                                                    "kind": "InterpElem::Literal",
+                                                                                    "loc": null,
+                                                                                    "children": {
+                                                                                      "repr": "from map: "
+                                                                                    }
+                                                                                  },
+                                                                                  {
+                                                                                    "kind": "InterpElem::Source",
+                                                                                    "loc": null,
+                                                                                    "children": {
+                                                                                      "source": "k"
+                                                                                    }
+                                                                                  },
+                                                                                  {
+                                                                                    "kind": "InterpElem::Literal",
+                                                                                    "loc": null,
+                                                                                    "children": {
+                                                                                      "repr": " => "
+                                                                                    }
+                                                                                  },
+                                                                                  {
+                                                                                    "kind": "InterpElem::Source",
+                                                                                    "loc": null,
+                                                                                    "children": {
+                                                                                      "source": "v"
+                                                                                    }
+                                                                                  }
+                                                                                ]
                                                                               }
-                                                                            ]
+                                                                            }
+                                                                          },
+                                                                          "kind": {
+                                                                            "kind": "ArgumentKind::Positional",
+                                                                            "loc": null,
+                                                                            "children": {}
                                                                           }
                                                                         }
-                                                                      },
-                                                                      "kind": {
-                                                                        "kind": "ArgumentKind::Positional",
-                                                                        "loc": null,
-                                                                        "children": {}
                                                                       }
-                                                                    }
+                                                                    ]
+                                                                  },
+                                                                  "attr": {
+                                                                    "kind": "ApplyAttr::NoAttr",
+                                                                    "loc": null,
+                                                                    "children": {}
                                                                   }
-                                                                ]
-                                                              },
-                                                              "attr": {
-                                                                "kind": "ApplyAttr::NoAttr",
-                                                                "loc": null,
-                                                                "children": {}
+                                                                }
                                                               }
-                                                            }
-                                                          }
-                                                        ]
-                                                      },
-                                                      "last_expr": {
-                                                        "kind": "Expr::Apply",
-                                                        "loc": null,
-                                                        "children": {
-                                                          "func": {
-                                                            "kind": "Expr::Ident",
+                                                            ]
+                                                          },
+                                                          "last_expr": {
+                                                            "kind": "Expr::Apply",
                                                             "loc": null,
                                                             "children": {
-                                                              "id": {
-                                                                "kind": "Var",
+                                                              "func": {
+                                                                "kind": "Expr::Ident",
                                                                 "loc": null,
                                                                 "children": {
-                                                                  "name": {
-                                                                    "kind": "LongIdent::Ident",
+                                                                  "id": {
+                                                                    "kind": "Var",
                                                                     "loc": null,
                                                                     "children": {
-                                                                      "value": "pause"
+                                                                      "name": {
+                                                                        "kind": "LongIdent::Ident",
+                                                                        "loc": null,
+                                                                        "children": {
+                                                                          "value": "pause"
+                                                                        }
+                                                                      }
                                                                     }
                                                                   }
                                                                 }
+                                                              },
+                                                              "args": {
+                                                                "kind": "Expr::Apply::ArgumentList",
+                                                                "loc": null,
+                                                                "children": []
+                                                              },
+                                                              "attr": {
+                                                                "kind": "ApplyAttr::NoAttr",
+                                                                "loc": null,
+                                                                "children": {}
                                                               }
                                                             }
-                                                          },
-                                                          "args": {
-                                                            "kind": "Expr::Apply::ArgumentList",
-                                                            "loc": null,
-                                                            "children": []
-                                                          },
-                                                          "attr": {
-                                                            "kind": "ApplyAttr::NoAttr",
-                                                            "loc": null,
-                                                            "children": {}
                                                           }
                                                         }
-                                                      }
+                                                      },
+                                                      "else_block": null,
+                                                      "label": null
                                                     }
                                                   },
-                                                  "else_block": null,
-                                                  "label": null
+                                                  "group": {
+                                                    "kind": "Group::Brace",
+                                                    "loc": null,
+                                                    "children": {}
+                                                  }
                                                 }
                                               },
                                               "return_type": null,
@@ -1767,7 +1778,7 @@
                                                 "children": {}
                                               },
                                               "kind": {
-                                                "kind": "FnKind::Lambda",
+                                                "kind": "FnKind::Arrow",
                                                 "loc": null,
                                                 "children": {}
                                               },
@@ -1838,163 +1849,174 @@
                                                 "children": []
                                               },
                                               "body": {
-                                                "kind": "Expr::ForEach",
+                                                "kind": "Expr::Group",
                                                 "loc": null,
                                                 "children": {
-                                                  "binders": {
-                                                    "kind": "Expr::ForEach::BinderList",
-                                                    "loc": null,
-                                                    "children": [
-                                                      {
-                                                        "kind": "Binder",
-                                                        "loc": null,
-                                                        "children": {
-                                                          "name": "c"
-                                                        }
-                                                      }
-                                                    ]
-                                                  },
                                                   "expr": {
-                                                    "kind": "Expr::Ident",
+                                                    "kind": "Expr::ForEach",
                                                     "loc": null,
                                                     "children": {
-                                                      "id": {
-                                                        "kind": "Var",
+                                                      "binders": {
+                                                        "kind": "Expr::ForEach::BinderList",
+                                                        "loc": null,
+                                                        "children": [
+                                                          {
+                                                            "kind": "Binder",
+                                                            "loc": null,
+                                                            "children": {
+                                                              "name": "c"
+                                                            }
+                                                          }
+                                                        ]
+                                                      },
+                                                      "expr": {
+                                                        "kind": "Expr::Ident",
                                                         "loc": null,
                                                         "children": {
-                                                          "name": {
-                                                            "kind": "LongIdent::Ident",
+                                                          "id": {
+                                                            "kind": "Var",
                                                             "loc": null,
                                                             "children": {
-                                                              "value": "str"
+                                                              "name": {
+                                                                "kind": "LongIdent::Ident",
+                                                                "loc": null,
+                                                                "children": {
+                                                                  "value": "str"
+                                                                }
+                                                              }
                                                             }
                                                           }
                                                         }
-                                                      }
-                                                    }
-                                                  },
-                                                  "body": {
-                                                    "kind": "Expr::Sequence",
-                                                    "loc": null,
-                                                    "children": {
-                                                      "exprs": {
-                                                        "kind": "Expr::Sequence::ExprList",
+                                                      },
+                                                      "body": {
+                                                        "kind": "Expr::Sequence",
                                                         "loc": null,
-                                                        "children": [
-                                                          {
-                                                            "kind": "Expr::Apply",
+                                                        "children": {
+                                                          "exprs": {
+                                                            "kind": "Expr::Sequence::ExprList",
                                                             "loc": null,
-                                                            "children": {
-                                                              "func": {
-                                                                "kind": "Expr::Ident",
+                                                            "children": [
+                                                              {
+                                                                "kind": "Expr::Apply",
                                                                 "loc": null,
                                                                 "children": {
-                                                                  "id": {
-                                                                    "kind": "Var",
+                                                                  "func": {
+                                                                    "kind": "Expr::Ident",
                                                                     "loc": null,
                                                                     "children": {
-                                                                      "name": {
-                                                                        "kind": "LongIdent::Ident",
+                                                                      "id": {
+                                                                        "kind": "Var",
                                                                         "loc": null,
                                                                         "children": {
-                                                                          "value": "println"
+                                                                          "name": {
+                                                                            "kind": "LongIdent::Ident",
+                                                                            "loc": null,
+                                                                            "children": {
+                                                                              "value": "println"
+                                                                            }
+                                                                          }
                                                                         }
                                                                       }
                                                                     }
-                                                                  }
-                                                                }
-                                                              },
-                                                              "args": {
-                                                                "kind": "Expr::Apply::ArgumentList",
-                                                                "loc": null,
-                                                                "children": [
-                                                                  {
-                                                                    "kind": "Argument",
+                                                                  },
+                                                                  "args": {
+                                                                    "kind": "Expr::Apply::ArgumentList",
                                                                     "loc": null,
-                                                                    "children": {
-                                                                      "value": {
-                                                                        "kind": "Expr::Interp",
+                                                                    "children": [
+                                                                      {
+                                                                        "kind": "Argument",
                                                                         "loc": null,
                                                                         "children": {
-                                                                          "elems": {
-                                                                            "kind": "Expr::Interp::ElemList",
+                                                                          "value": {
+                                                                            "kind": "Expr::Interp",
                                                                             "loc": null,
-                                                                            "children": [
-                                                                              {
-                                                                                "kind": "InterpElem::Literal",
-                                                                                "loc": null,
-                                                                                "children": {
-                                                                                  "repr": "from str: "
-                                                                                }
-                                                                              },
-                                                                              {
-                                                                                "kind": "InterpElem::Source",
+                                                                            "children": {
+                                                                              "elems": {
+                                                                                "kind": "Expr::Interp::ElemList",
                                                                                 "loc": null,
-                                                                                "children": {
-                                                                                  "source": "c"
-                                                                                }
+                                                                                "children": [
+                                                                                  {
+                                                                                    "kind": "InterpElem::Literal",
+                                                                                    "loc": null,
+                                                                                    "children": {
+                                                                                      "repr": "from str: "
+                                                                                    }
+                                                                                  },
+                                                                                  {
+                                                                                    "kind": "InterpElem::Source",
+                                                                                    "loc": null,
+                                                                                    "children": {
+                                                                                      "source": "c"
+                                                                                    }
+                                                                                  }
+                                                                                ]
                                                                               }
-                                                                            ]
+                                                                            }
+                                                                          },
+                                                                          "kind": {
+                                                                            "kind": "ArgumentKind::Positional",
+                                                                            "loc": null,
+                                                                            "children": {}
                                                                           }
                                                                         }
-                                                                      },
-                                                                      "kind": {
-                                                                        "kind": "ArgumentKind::Positional",
-                                                                        "loc": null,
-                                                                        "children": {}
                                                                       }
-                                                                    }
+                                                                    ]
+                                                                  },
+                                                                  "attr": {
+                                                                    "kind": "ApplyAttr::NoAttr",
+                                                                    "loc": null,
+                                                                    "children": {}
                                                                   }
-                                                                ]
-                                                              },
-                                                              "attr": {
-                                                                "kind": "ApplyAttr::NoAttr",
-                                                                "loc": null,
-                                                                "children": {}
+                                                                }
                                                               }
-                                                            }
-                                                          }
-                                                        ]
-                                                      },
-                                                      "last_expr": {
-                                                        "kind": "Expr::Apply",
-                                                        "loc": null,
-                                                        "children": {
-                                                          "func": {
-                                                            "kind": "Expr::Ident",
+                                                            ]
+                                                          },
+                                                          "last_expr": {
+                                                            "kind": "Expr::Apply",
                                                             "loc": null,
                                                             "children": {
-                                                              "id": {
-                                                                "kind": "Var",
+                                                              "func": {
+                                                                "kind": "Expr::Ident",
                                                                 "loc": null,
                                                                 "children": {
-                                                                  "name": {
-                                                                    "kind": "LongIdent::Ident",
+                                                                  "id": {
+                                                                    "kind": "Var",
                                                                     "loc": null,
                                                                     "children": {
-                                                                      "value": "pause"
+                                                                      "name": {
+                                                                        "kind": "LongIdent::Ident",
+                                                                        "loc": null,
+                                                                        "children": {
+                                                                          "value": "pause"
+                                                                        }
+                                                                      }
                                                                     }
                                                                   }
                                                                 }
+                                                              },
+                                                              "args": {
+                                                                "kind": "Expr::Apply::ArgumentList",
+                                                                "loc": null,
+                                                                "children": []
+                                                              },
+                                                              "attr": {
+                                                                "kind": "ApplyAttr::NoAttr",
+                                                                "loc": null,
+                                                                "children": {}
                                                               }
                                                             }
-                                                          },
-                                                          "args": {
-                                                            "kind": "Expr::Apply::ArgumentList",
-                                                            "loc": null,
-                                                            "children": []
-                                                          },
-                                                          "attr": {
-                                                            "kind": "ApplyAttr::NoAttr",
-                                                            "loc": null,
-                                                            "children": {}
                                                           }
                                                         }
-                                                      }
+                                                      },
+                                                      "else_block": null,
+                                                      "label": null
                                                     }
                                                   },
-                                                  "else_block": null,
-                                                  "label": null
+                                                  "group": {
+                                                    "kind": "Group::Brace",
+                                                    "loc": null,
+                                                    "children": {}
+                                                  }
                                                 }
                                               },
                                               "return_type": null,
@@ -2004,7 +2026,7 @@
                                                 "children": {}
                                               },
                                               "kind": {
-                                                "kind": "FnKind::Lambda",
+                                                "kind": "FnKind::Arrow",
                                                 "loc": null,
                                                 "children": {}
                                               },
diff --git a/test/sync_test/__snapshot__/pipeline_test_async_for.mbt b/test/sync_test/__snapshot__/pipeline_test_async_for.mbt
index 9f000eb6..08cde492 100644
--- a/test/sync_test/__snapshot__/pipeline_test_async_for.mbt
+++ b/test/sync_test/__snapshot__/pipeline_test_async_for.mbt
@@ -20,13 +20,13 @@ fn run_all() -> Unit {
 fn main {
   let map = { "x": 1, "y": 2, "z": 3 }
   let str = "字😅↑"
-  spawn(fn() {
+  spawn(() => {
     for k, v in map {
       println("from map: \{k} => \{v}")
       pause()
     }
   })
-  spawn(fn() {
+  spawn(() => {
     for c in str {
       println("from str: \{c}")
       pause()
diff --git a/test/sync_test/__snapshot__/pipeline_test_async_for.mbt.tokens.json b/test/sync_test/__snapshot__/pipeline_test_async_for.mbt.tokens.json
index ef55efcf..856a9afd 100644
--- a/test/sync_test/__snapshot__/pipeline_test_async_for.mbt.tokens.json
+++ b/test/sync_test/__snapshot__/pipeline_test_async_for.mbt.tokens.json
@@ -914,25 +914,25 @@
     "token": "LPAREN",
     "loc": "23:8-23:9"
   },
-  {
-    "token": "FN",
-    "loc": "23:9-23:11"
-  },
   {
     "token": "LPAREN",
-    "loc": "23:11-23:12"
+    "loc": "23:9-23:10"
   },
   {
     "token": "RPAREN",
-    "loc": "23:12-23:13"
+    "loc": "23:10-23:11"
+  },
+  {
+    "token": "FAT_ARROW",
+    "loc": "23:12-23:14"
   },
   {
     "token": "LBRACE",
-    "loc": "23:14-23:15"
+    "loc": "23:15-23:16"
   },
   {
     "token": "NEWLINE",
-    "loc": "23:15-23:16"
+    "loc": "23:16-23:17"
   },
   {
     "token": "FOR",
@@ -1065,25 +1065,25 @@
     "token": "LPAREN",
     "loc": "29:8-29:9"
   },
-  {
-    "token": "FN",
-    "loc": "29:9-29:11"
-  },
   {
     "token": "LPAREN",
-    "loc": "29:11-29:12"
+    "loc": "29:9-29:10"
   },
   {
     "token": "RPAREN",
-    "loc": "29:12-29:13"
+    "loc": "29:10-29:11"
+  },
+  {
+    "token": "FAT_ARROW",
+    "loc": "29:12-29:14"
   },
   {
     "token": "LBRACE",
-    "loc": "29:14-29:15"
+    "loc": "29:15-29:16"
   },
   {
     "token": "NEWLINE",
-    "loc": "29:15-29:16"
+    "loc": "29:16-29:17"
   },
   {
     "token": "FOR",
diff --git a/test/sync_test/__snapshot__/pipeline_test_async_loop.json b/test/sync_test/__snapshot__/pipeline_test_async_loop.json
index a397e54d..3debc14b 100644
--- a/test/sync_test/__snapshot__/pipeline_test_async_loop.json
+++ b/test/sync_test/__snapshot__/pipeline_test_async_loop.json
@@ -5356,139 +5356,150 @@
                                                 "children": []
                                               },
                                               "body": {
-                                                "kind": "Expr::Try",
+                                                "kind": "Expr::Group",
                                                 "loc": null,
                                                 "children": {
-                                                  "body": {
-                                                    "kind": "Expr::Apply",
+                                                  "expr": {
+                                                    "kind": "Expr::Try",
                                                     "loc": null,
                                                     "children": {
-                                                      "func": {
-                                                        "kind": "Expr::Ident",
+                                                      "body": {
+                                                        "kind": "Expr::Apply",
                                                         "loc": null,
                                                         "children": {
-                                                          "id": {
-                                                            "kind": "Var",
+                                                          "func": {
+                                                            "kind": "Expr::Ident",
                                                             "loc": null,
                                                             "children": {
-                                                              "name": {
-                                                                "kind": "LongIdent::Ident",
+                                                              "id": {
+                                                                "kind": "Var",
                                                                 "loc": null,
                                                                 "children": {
-                                                                  "value": "f"
+                                                                  "name": {
+                                                                    "kind": "LongIdent::Ident",
+                                                                    "loc": null,
+                                                                    "children": {
+                                                                      "value": "f"
+                                                                    }
+                                                                  }
                                                                 }
                                                               }
                                                             }
+                                                          },
+                                                          "args": {
+                                                            "kind": "Expr::Apply::ArgumentList",
+                                                            "loc": null,
+                                                            "children": []
+                                                          },
+                                                          "attr": {
+                                                            "kind": "ApplyAttr::NoAttr",
+                                                            "loc": null,
+                                                            "children": {}
                                                           }
                                                         }
                                                       },
-                                                      "args": {
-                                                        "kind": "Expr::Apply::ArgumentList",
-                                                        "loc": null,
-                                                        "children": []
-                                                      },
-                                                      "attr": {
-                                                        "kind": "ApplyAttr::NoAttr",
-                                                        "loc": null,
-                                                        "children": {}
-                                                      }
-                                                    }
-                                                  },
-                                                  "catch": {
-                                                    "kind": "Expr::Try::CaseList",
-                                                    "loc": null,
-                                                    "children": [
-                                                      {
-                                                        "kind": "Case",
+                                                      "catch": {
+                                                        "kind": "Expr::Try::CaseList",
                                                         "loc": null,
-                                                        "children": {
-                                                          "pattern": {
-                                                            "kind": "Pattern::Var",
+                                                        "children": [
+                                                          {
+                                                            "kind": "Case",
                                                             "loc": null,
                                                             "children": {
-                                                              "value": {
-                                                                "kind": "Binder",
+                                                              "pattern": {
+                                                                "kind": "Pattern::Var",
                                                                 "loc": null,
                                                                 "children": {
-                                                                  "name": "err"
+                                                                  "value": {
+                                                                    "kind": "Binder",
+                                                                    "loc": null,
+                                                                    "children": {
+                                                                      "name": "err"
+                                                                    }
+                                                                  }
                                                                 }
-                                                              }
-                                                            }
-                                                          },
-                                                          "guard": null,
-                                                          "body": {
-                                                            "kind": "Expr::Apply",
-                                                            "loc": null,
-                                                            "children": {
-                                                              "func": {
-                                                                "kind": "Expr::Ident",
+                                                              },
+                                                              "guard": null,
+                                                              "body": {
+                                                                "kind": "Expr::Apply",
                                                                 "loc": null,
                                                                 "children": {
-                                                                  "id": {
-                                                                    "kind": "Var",
+                                                                  "func": {
+                                                                    "kind": "Expr::Ident",
                                                                     "loc": null,
                                                                     "children": {
-                                                                      "name": {
-                                                                        "kind": "LongIdent::Ident",
+                                                                      "id": {
+                                                                        "kind": "Var",
                                                                         "loc": null,
                                                                         "children": {
-                                                                          "value": "println"
+                                                                          "name": {
+                                                                            "kind": "LongIdent::Ident",
+                                                                            "loc": null,
+                                                                            "children": {
+                                                                              "value": "println"
+                                                                            }
+                                                                          }
                                                                         }
                                                                       }
                                                                     }
-                                                                  }
-                                                                }
-                                                              },
-                                                              "args": {
-                                                                "kind": "Expr::Apply::ArgumentList",
-                                                                "loc": null,
-                                                                "children": [
-                                                                  {
-                                                                    "kind": "Argument",
+                                                                  },
+                                                                  "args": {
+                                                                    "kind": "Expr::Apply::ArgumentList",
                                                                     "loc": null,
-                                                                    "children": {
-                                                                      "value": {
-                                                                        "kind": "Expr::Ident",
+                                                                    "children": [
+                                                                      {
+                                                                        "kind": "Argument",
                                                                         "loc": null,
                                                                         "children": {
-                                                                          "id": {
-                                                                            "kind": "Var",
+                                                                          "value": {
+                                                                            "kind": "Expr::Ident",
                                                                             "loc": null,
                                                                             "children": {
-                                                                              "name": {
-                                                                                "kind": "LongIdent::Ident",
+                                                                              "id": {
+                                                                                "kind": "Var",
                                                                                 "loc": null,
                                                                                 "children": {
-                                                                                  "value": "err"
+                                                                                  "name": {
+                                                                                    "kind": "LongIdent::Ident",
+                                                                                    "loc": null,
+                                                                                    "children": {
+                                                                                      "value": "err"
+                                                                                    }
+                                                                                  }
                                                                                 }
                                                                               }
                                                                             }
+                                                                          },
+                                                                          "kind": {
+                                                                            "kind": "ArgumentKind::Positional",
+                                                                            "loc": null,
+                                                                            "children": {}
                                                                           }
                                                                         }
-                                                                      },
-                                                                      "kind": {
-                                                                        "kind": "ArgumentKind::Positional",
-                                                                        "loc": null,
-                                                                        "children": {}
                                                                       }
-                                                                    }
+                                                                    ]
+                                                                  },
+                                                                  "attr": {
+                                                                    "kind": "ApplyAttr::NoAttr",
+                                                                    "loc": null,
+                                                                    "children": {}
                                                                   }
-                                                                ]
-                                                              },
-                                                              "attr": {
-                                                                "kind": "ApplyAttr::NoAttr",
-                                                                "loc": null,
-                                                                "children": {}
+                                                                }
                                                               }
                                                             }
                                                           }
-                                                        }
-                                                      }
-                                                    ]
+                                                        ]
+                                                      },
+                                                      "catch_all": false,
+                                                      "try_else": null,
+                                                      "has_try": true
+                                                    }
                                                   },
-                                                  "catch_all": false,
-                                                  "try_else": null,
-                                                  "has_try": true
+                                                  "group": {
+                                                    "kind": "Group::Brace",
+                                                    "loc": null,
+                                                    "children": {}
+                                                  }
                                                 }
                                               },
                                               "return_type": null,
@@ -5498,7 +5509,7 @@
                                                 "children": {}
                                               },
                                               "kind": {
-                                                "kind": "FnKind::Lambda",
+                                                "kind": "FnKind::Arrow",
                                                 "loc": null,
                                                 "children": {}
                                               },
diff --git a/test/sync_test/__snapshot__/pipeline_test_async_loop.mbt b/test/sync_test/__snapshot__/pipeline_test_async_loop.mbt
index c65b3cde..786e9abe 100644
--- a/test/sync_test/__snapshot__/pipeline_test_async_loop.mbt
+++ b/test/sync_test/__snapshot__/pipeline_test_async_loop.mbt
@@ -124,7 +124,7 @@ fn main {
     run_async(f)
   }
   and run_err = fn (f : async () -> Unit raise Err) {
-    run(fn () {
+    run(() => {
       try f() catch { err => println(err) }
     })
   }
diff --git a/test/sync_test/__snapshot__/pipeline_test_async_loop.mbt.tokens.json b/test/sync_test/__snapshot__/pipeline_test_async_loop.mbt.tokens.json
index 610408a4..1e35745a 100644
--- a/test/sync_test/__snapshot__/pipeline_test_async_loop.mbt.tokens.json
+++ b/test/sync_test/__snapshot__/pipeline_test_async_loop.mbt.tokens.json
@@ -3701,17 +3701,17 @@
     "token": "LPAREN",
     "loc": "127:8-127:9"
   },
-  {
-    "token": "FN",
-    "loc": "127:9-127:11"
-  },
   {
     "token": "LPAREN",
-    "loc": "127:12-127:13"
+    "loc": "127:9-127:10"
   },
   {
     "token": "RPAREN",
-    "loc": "127:13-127:14"
+    "loc": "127:10-127:11"
+  },
+  {
+    "token": "FAT_ARROW",
+    "loc": "127:12-127:14"
   },
   {
     "token": "LBRACE",
diff --git a/test/sync_test/__snapshot__/pipeline_test_async_misc.json b/test/sync_test/__snapshot__/pipeline_test_async_misc.json
index 3b590afc..a51a023d 100644
--- a/test/sync_test/__snapshot__/pipeline_test_async_misc.json
+++ b/test/sync_test/__snapshot__/pipeline_test_async_misc.json
@@ -496,7 +496,7 @@
                                 "children": {}
                               },
                               "kind": {
-                                "kind": "FnKind::Lambda",
+                                "kind": "FnKind::Arrow",
                                 "loc": null,
                                 "children": {}
                               },
@@ -1016,7 +1016,7 @@
                                 "children": {}
                               },
                               "kind": {
-                                "kind": "FnKind::Lambda",
+                                "kind": "FnKind::Arrow",
                                 "loc": null,
                                 "children": {}
                               },
@@ -2062,7 +2062,7 @@
                                 "children": {}
                               },
                               "kind": {
-                                "kind": "FnKind::Lambda",
+                                "kind": "FnKind::Arrow",
                                 "loc": null,
                                 "children": {}
                               },
diff --git a/test/sync_test/__snapshot__/pipeline_test_async_misc.mbt b/test/sync_test/__snapshot__/pipeline_test_async_misc.mbt
index f0d21822..eb3e7aae 100644
--- a/test/sync_test/__snapshot__/pipeline_test_async_misc.mbt
+++ b/test/sync_test/__snapshot__/pipeline_test_async_misc.mbt
@@ -7,9 +7,7 @@ async fn tuple() -> (Int, String) noraise {
 }
 
 fn init {
-  run_async(fn () {
-    println(tuple())
-  })
+  run_async(() => println(tuple()))
 }
 
 async fn switch_constant(x : Int) -> Unit noraise {
@@ -21,7 +19,7 @@ async fn switch_constant(x : Int) -> Unit noraise {
 }
 
 fn init {
-  run_async(fn () { switch_constant(42) })
+  run_async(() => switch_constant(42))
 }
 
 suberror Err
@@ -49,5 +47,5 @@ async fn join_in_loop_without_async(input : Array[Int]) -> Unit noraise {
 }
 
 fn init {
-  run_async(fn () { join_in_loop_without_async([ 1, 2, 3 ]) })
+  run_async(() => join_in_loop_without_async([ 1, 2, 3 ]))
 }
diff --git a/test/sync_test/__snapshot__/pipeline_test_async_misc.mbt.tokens.json b/test/sync_test/__snapshot__/pipeline_test_async_misc.mbt.tokens.json
index d9fc2d56..32fa152f 100644
--- a/test/sync_test/__snapshot__/pipeline_test_async_misc.mbt.tokens.json
+++ b/test/sync_test/__snapshot__/pipeline_test_async_misc.mbt.tokens.json
@@ -262,1038 +262,1006 @@
     "token": "LPAREN",
     "loc": "10:12-10:13"
   },
-  {
-    "token": "FN",
-    "loc": "10:13-10:15"
-  },
   {
     "token": "LPAREN",
-    "loc": "10:16-10:17"
+    "loc": "10:13-10:14"
   },
   {
     "token": "RPAREN",
-    "loc": "10:17-10:18"
-  },
-  {
-    "token": "LBRACE",
-    "loc": "10:19-10:20"
+    "loc": "10:14-10:15"
   },
   {
-    "token": "NEWLINE",
-    "loc": "10:20-10:21"
+    "token": "FAT_ARROW",
+    "loc": "10:16-10:18"
   },
   {
     "token": [
       "LIDENT",
       "println"
     ],
-    "loc": "11:5-11:12"
+    "loc": "10:19-10:26"
   },
   {
     "token": "LPAREN",
-    "loc": "11:12-11:13"
+    "loc": "10:26-10:27"
   },
   {
     "token": [
       "LIDENT",
       "tuple"
     ],
-    "loc": "11:13-11:18"
+    "loc": "10:27-10:32"
   },
   {
     "token": "LPAREN",
-    "loc": "11:18-11:19"
+    "loc": "10:32-10:33"
   },
   {
     "token": "RPAREN",
-    "loc": "11:19-11:20"
+    "loc": "10:33-10:34"
   },
   {
     "token": "RPAREN",
-    "loc": "11:20-11:21"
-  },
-  {
-    "token": "NEWLINE",
-    "loc": "11:21-11:22"
-  },
-  {
-    "token": "RBRACE",
-    "loc": "12:3-12:4"
+    "loc": "10:34-10:35"
   },
   {
     "token": "RPAREN",
-    "loc": "12:4-12:5"
+    "loc": "10:35-10:36"
   },
   {
     "token": "NEWLINE",
-    "loc": "12:5-12:6"
+    "loc": "10:36-10:37"
   },
   {
     "token": "RBRACE",
-    "loc": "13:1-13:2"
+    "loc": "11:1-11:2"
   },
   {
     "token": [
       "SEMI",
       false
     ],
-    "loc": "13:2-13:2"
+    "loc": "11:2-11:2"
   },
   {
     "token": "NEWLINE",
-    "loc": "13:2-13:3"
+    "loc": "11:2-11:3"
   },
   {
     "token": "NEWLINE",
-    "loc": "14:1-14:2"
+    "loc": "12:1-12:2"
   },
   {
     "token": "ASYNC",
-    "loc": "15:1-15:6"
+    "loc": "13:1-13:6"
   },
   {
     "token": "FN",
-    "loc": "15:7-15:9"
+    "loc": "13:7-13:9"
   },
   {
     "token": [
       "LIDENT",
       "switch_constant"
     ],
-    "loc": "15:10-15:25"
+    "loc": "13:10-13:25"
   },
   {
     "token": "LPAREN",
-    "loc": "15:25-15:26"
+    "loc": "13:25-13:26"
   },
   {
     "token": [
       "LIDENT",
       "x"
     ],
-    "loc": "15:26-15:27"
+    "loc": "13:26-13:27"
   },
   {
     "token": "COLON",
-    "loc": "15:28-15:29"
+    "loc": "13:28-13:29"
   },
   {
     "token": [
       "UIDENT",
       "Int"
     ],
-    "loc": "15:30-15:33"
+    "loc": "13:30-13:33"
   },
   {
     "token": "RPAREN",
-    "loc": "15:33-15:34"
+    "loc": "13:33-13:34"
   },
   {
     "token": "THIN_ARROW",
-    "loc": "15:35-15:37"
+    "loc": "13:35-13:37"
   },
   {
     "token": [
       "UIDENT",
       "Unit"
     ],
-    "loc": "15:38-15:42"
+    "loc": "13:38-13:42"
   },
   {
     "token": "NORAISE",
-    "loc": "15:43-15:50"
+    "loc": "13:43-13:50"
   },
   {
     "token": "LBRACE",
-    "loc": "15:51-15:52"
+    "loc": "13:51-13:52"
   },
   {
     "token": "NEWLINE",
-    "loc": "15:52-15:53"
+    "loc": "13:52-13:53"
   },
   {
     "token": "MATCH",
-    "loc": "16:3-16:8"
+    "loc": "14:3-14:8"
   },
   {
     "token": [
       "LIDENT",
       "x"
     ],
-    "loc": "16:9-16:10"
+    "loc": "14:9-14:10"
   },
   {
     "token": "LBRACE",
-    "loc": "16:11-16:12"
+    "loc": "14:11-14:12"
   },
   {
     "token": "NEWLINE",
-    "loc": "16:12-16:13"
+    "loc": "14:12-14:13"
   },
   {
     "token": [
       "INT",
       "42"
     ],
-    "loc": "17:5-17:7"
+    "loc": "15:5-15:7"
   },
   {
     "token": "FAT_ARROW",
-    "loc": "17:8-17:10"
+    "loc": "15:8-15:10"
   },
   {
     "token": [
       "LIDENT",
       "println"
     ],
-    "loc": "17:11-17:18"
+    "loc": "15:11-15:18"
   },
   {
     "token": "LPAREN",
-    "loc": "17:18-17:19"
+    "loc": "15:18-15:19"
   },
   {
     "token": [
       "STRING",
       "ans"
     ],
-    "loc": "17:19-17:24"
+    "loc": "15:19-15:24"
   },
   {
     "token": "RPAREN",
-    "loc": "17:24-17:25"
+    "loc": "15:24-15:25"
   },
   {
     "token": [
       "SEMI",
       false
     ],
-    "loc": "17:25-17:25"
+    "loc": "15:25-15:25"
   },
   {
     "token": "NEWLINE",
-    "loc": "17:25-17:26"
+    "loc": "15:25-15:26"
   },
   {
     "token": "UNDERSCORE",
-    "loc": "18:5-18:6"
+    "loc": "16:5-16:6"
   },
   {
     "token": "FAT_ARROW",
-    "loc": "18:7-18:9"
+    "loc": "16:7-16:9"
   },
   {
     "token": "LPAREN",
-    "loc": "18:10-18:11"
+    "loc": "16:10-16:11"
   },
   {
     "token": "RPAREN",
-    "loc": "18:11-18:12"
+    "loc": "16:11-16:12"
   },
   {
     "token": "NEWLINE",
-    "loc": "18:12-18:13"
+    "loc": "16:12-16:13"
   },
   {
     "token": "RBRACE",
-    "loc": "19:3-19:4"
+    "loc": "17:3-17:4"
   },
   {
     "token": [
       "SEMI",
       false
     ],
-    "loc": "19:4-19:4"
+    "loc": "17:4-17:4"
   },
   {
     "token": "NEWLINE",
-    "loc": "19:4-19:5"
+    "loc": "17:4-17:5"
   },
   {
     "token": [
       "LIDENT",
       "println"
     ],
-    "loc": "20:3-20:10"
+    "loc": "18:3-18:10"
   },
   {
     "token": "LPAREN",
-    "loc": "20:10-20:11"
+    "loc": "18:10-18:11"
   },
   {
     "token": [
       "STRING",
       "after"
     ],
-    "loc": "20:11-20:18"
+    "loc": "18:11-18:18"
   },
   {
     "token": "RPAREN",
-    "loc": "20:18-20:19"
+    "loc": "18:18-18:19"
   },
   {
     "token": "NEWLINE",
-    "loc": "20:19-20:20"
+    "loc": "18:19-18:20"
   },
   {
     "token": "RBRACE",
-    "loc": "21:1-21:2"
+    "loc": "19:1-19:2"
   },
   {
     "token": [
       "SEMI",
       false
     ],
-    "loc": "21:2-21:2"
+    "loc": "19:2-19:2"
   },
   {
     "token": "NEWLINE",
-    "loc": "21:2-21:3"
+    "loc": "19:2-19:3"
   },
   {
     "token": "NEWLINE",
-    "loc": "22:1-22:2"
+    "loc": "20:1-20:2"
   },
   {
     "token": "FN",
-    "loc": "23:1-23:3"
+    "loc": "21:1-21:3"
   },
   {
     "token": [
       "LIDENT",
       "init"
     ],
-    "loc": "23:4-23:8"
+    "loc": "21:4-21:8"
   },
   {
     "token": "LBRACE",
-    "loc": "23:9-23:10"
+    "loc": "21:9-21:10"
   },
   {
     "token": "NEWLINE",
-    "loc": "23:10-23:11"
+    "loc": "21:10-21:11"
   },
   {
     "token": [
       "LIDENT",
       "run_async"
     ],
-    "loc": "24:3-24:12"
+    "loc": "22:3-22:12"
   },
   {
     "token": "LPAREN",
-    "loc": "24:12-24:13"
-  },
-  {
-    "token": "FN",
-    "loc": "24:13-24:15"
+    "loc": "22:12-22:13"
   },
   {
     "token": "LPAREN",
-    "loc": "24:16-24:17"
+    "loc": "22:13-22:14"
   },
   {
     "token": "RPAREN",
-    "loc": "24:17-24:18"
+    "loc": "22:14-22:15"
   },
   {
-    "token": "LBRACE",
-    "loc": "24:19-24:20"
+    "token": "FAT_ARROW",
+    "loc": "22:16-22:18"
   },
   {
     "token": [
       "LIDENT",
       "switch_constant"
     ],
-    "loc": "24:21-24:36"
+    "loc": "22:19-22:34"
   },
   {
     "token": "LPAREN",
-    "loc": "24:36-24:37"
+    "loc": "22:34-22:35"
   },
   {
     "token": [
       "INT",
       "42"
     ],
-    "loc": "24:37-24:39"
+    "loc": "22:35-22:37"
   },
   {
     "token": "RPAREN",
-    "loc": "24:39-24:40"
-  },
-  {
-    "token": "RBRACE",
-    "loc": "24:41-24:42"
+    "loc": "22:37-22:38"
   },
   {
     "token": "RPAREN",
-    "loc": "24:42-24:43"
+    "loc": "22:38-22:39"
   },
   {
     "token": "NEWLINE",
-    "loc": "24:43-24:44"
+    "loc": "22:39-22:40"
   },
   {
     "token": "RBRACE",
-    "loc": "25:1-25:2"
+    "loc": "23:1-23:2"
   },
   {
     "token": [
       "SEMI",
       false
     ],
-    "loc": "25:2-25:2"
+    "loc": "23:2-23:2"
   },
   {
     "token": "NEWLINE",
-    "loc": "25:2-25:3"
+    "loc": "23:2-23:3"
   },
   {
     "token": "NEWLINE",
-    "loc": "26:1-26:2"
+    "loc": "24:1-24:2"
   },
   {
     "token": "SUBERROR",
-    "loc": "27:1-27:9"
+    "loc": "25:1-25:9"
   },
   {
     "token": [
       "UIDENT",
       "Err"
     ],
-    "loc": "27:10-27:13"
+    "loc": "25:10-25:13"
   },
   {
     "token": [
       "SEMI",
       false
     ],
-    "loc": "27:13-27:13"
+    "loc": "25:13-25:13"
   },
   {
     "token": "NEWLINE",
-    "loc": "27:13-27:14"
+    "loc": "25:13-25:14"
   },
   {
     "token": "NEWLINE",
-    "loc": "28:1-28:2"
+    "loc": "26:1-26:2"
   },
   {
     "token": "ASYNC",
-    "loc": "29:1-29:6"
+    "loc": "27:1-27:6"
   },
   {
     "token": "FN",
-    "loc": "29:7-29:9"
+    "loc": "27:7-27:9"
   },
   {
     "token": [
       "LIDENT",
       "join_let"
     ],
-    "loc": "29:10-29:18"
+    "loc": "27:10-27:18"
   },
   {
     "token": "LPAREN",
-    "loc": "29:18-29:19"
+    "loc": "27:18-27:19"
   },
   {
     "token": "RPAREN",
-    "loc": "29:19-29:20"
+    "loc": "27:19-27:20"
   },
   {
     "token": "THIN_ARROW",
-    "loc": "29:21-29:23"
+    "loc": "27:21-27:23"
   },
   {
     "token": [
       "UIDENT",
       "Unit"
     ],
-    "loc": "29:24-29:28"
+    "loc": "27:24-27:28"
   },
   {
     "token": "NORAISE",
-    "loc": "29:29-29:36"
+    "loc": "27:29-27:36"
   },
   {
     "token": "LBRACE",
-    "loc": "29:37-29:38"
+    "loc": "27:37-27:38"
   },
   {
     "token": "NEWLINE",
-    "loc": "29:38-29:39"
+    "loc": "27:38-27:39"
   },
   {
     "token": "TRY",
-    "loc": "30:3-30:6"
+    "loc": "28:3-28:6"
   },
   {
     "token": "LBRACE",
-    "loc": "30:7-30:8"
+    "loc": "28:7-28:8"
   },
   {
     "token": "NEWLINE",
-    "loc": "30:8-30:9"
+    "loc": "28:8-28:9"
   },
   {
     "token": "RAISE",
-    "loc": "31:5-31:10"
+    "loc": "29:5-29:10"
   },
   {
     "token": [
       "UIDENT",
       "Err"
     ],
-    "loc": "31:11-31:14"
+    "loc": "29:11-29:14"
   },
   {
     "token": "NEWLINE",
-    "loc": "31:14-31:15"
+    "loc": "29:14-29:15"
   },
   {
     "token": "RBRACE",
-    "loc": "32:3-32:4"
+    "loc": "30:3-30:4"
   },
   {
     "token": "CATCH",
-    "loc": "32:5-32:10"
+    "loc": "30:5-30:10"
   },
   {
     "token": "LBRACE",
-    "loc": "32:11-32:12"
+    "loc": "30:11-30:12"
   },
   {
     "token": "NEWLINE",
-    "loc": "32:12-32:13"
+    "loc": "30:12-30:13"
   },
   {
     "token": [
       "UIDENT",
       "Err"
     ],
-    "loc": "33:5-33:8"
+    "loc": "31:5-31:8"
   },
   {
     "token": "FAT_ARROW",
-    "loc": "33:9-33:11"
+    "loc": "31:9-31:11"
   },
   {
     "token": "LPAREN",
-    "loc": "33:12-33:13"
+    "loc": "31:12-31:13"
   },
   {
     "token": "RPAREN",
-    "loc": "33:13-33:14"
+    "loc": "31:13-31:14"
   },
   {
     "token": "NEWLINE",
-    "loc": "33:14-33:15"
+    "loc": "31:14-31:15"
   },
   {
     "token": "RBRACE",
-    "loc": "34:3-34:4"
+    "loc": "32:3-32:4"
   },
   {
     "token": [
       "SEMI",
       false
     ],
-    "loc": "34:4-34:4"
+    "loc": "32:4-32:4"
   },
   {
     "token": "NEWLINE",
-    "loc": "34:4-34:5"
+    "loc": "32:4-32:5"
   },
   {
     "token": [
       "LIDENT",
       "println"
     ],
-    "loc": "35:3-35:10"
+    "loc": "33:3-33:10"
   },
   {
     "token": "LPAREN",
-    "loc": "35:10-35:11"
+    "loc": "33:10-33:11"
   },
   {
     "token": [
       "STRING",
       "join let"
     ],
-    "loc": "35:11-35:21"
+    "loc": "33:11-33:21"
   },
   {
     "token": "RPAREN",
-    "loc": "35:21-35:22"
+    "loc": "33:21-33:22"
   },
   {
     "token": "NEWLINE",
-    "loc": "35:22-35:23"
+    "loc": "33:22-33:23"
   },
   {
     "token": "RBRACE",
-    "loc": "36:1-36:2"
+    "loc": "34:1-34:2"
   },
   {
     "token": [
       "SEMI",
       false
     ],
-    "loc": "36:2-36:2"
+    "loc": "34:2-34:2"
   },
   {
     "token": "NEWLINE",
-    "loc": "36:2-36:3"
+    "loc": "34:2-34:3"
   },
   {
     "token": "NEWLINE",
-    "loc": "37:1-37:2"
+    "loc": "35:1-35:2"
   },
   {
     "token": "FN",
-    "loc": "38:1-38:3"
+    "loc": "36:1-36:3"
   },
   {
     "token": [
       "LIDENT",
       "init"
     ],
-    "loc": "38:4-38:8"
+    "loc": "36:4-36:8"
   },
   {
     "token": "LBRACE",
-    "loc": "38:9-38:10"
+    "loc": "36:9-36:10"
   },
   {
     "token": "NEWLINE",
-    "loc": "38:10-38:11"
+    "loc": "36:10-36:11"
   },
   {
     "token": [
       "LIDENT",
       "run_async"
     ],
-    "loc": "39:3-39:12"
+    "loc": "37:3-37:12"
   },
   {
     "token": "LPAREN",
-    "loc": "39:12-39:13"
+    "loc": "37:12-37:13"
   },
   {
     "token": [
       "LIDENT",
       "join_let"
     ],
-    "loc": "39:13-39:21"
+    "loc": "37:13-37:21"
   },
   {
     "token": "RPAREN",
-    "loc": "39:21-39:22"
+    "loc": "37:21-37:22"
   },
   {
     "token": "NEWLINE",
-    "loc": "39:22-39:23"
+    "loc": "37:22-37:23"
   },
   {
     "token": "RBRACE",
-    "loc": "40:1-40:2"
+    "loc": "38:1-38:2"
   },
   {
     "token": [
       "SEMI",
       false
     ],
-    "loc": "40:2-40:2"
+    "loc": "38:2-38:2"
   },
   {
     "token": "NEWLINE",
-    "loc": "40:2-40:3"
+    "loc": "38:2-38:3"
   },
   {
     "token": "NEWLINE",
-    "loc": "41:1-41:2"
+    "loc": "39:1-39:2"
   },
   {
     "token": "ASYNC",
-    "loc": "42:1-42:6"
+    "loc": "40:1-40:6"
   },
   {
     "token": "FN",
-    "loc": "42:7-42:9"
+    "loc": "40:7-40:9"
   },
   {
     "token": [
       "LIDENT",
       "join_in_loop_without_async"
     ],
-    "loc": "42:10-42:36"
+    "loc": "40:10-40:36"
   },
   {
     "token": "LPAREN",
-    "loc": "42:36-42:37"
+    "loc": "40:36-40:37"
   },
   {
     "token": [
       "LIDENT",
       "input"
     ],
-    "loc": "42:37-42:42"
+    "loc": "40:37-40:42"
   },
   {
     "token": "COLON",
-    "loc": "42:43-42:44"
+    "loc": "40:43-40:44"
   },
   {
     "token": [
       "UIDENT",
       "Array"
     ],
-    "loc": "42:45-42:50"
+    "loc": "40:45-40:50"
   },
   {
     "token": "LBRACKET",
-    "loc": "42:50-42:51"
+    "loc": "40:50-40:51"
   },
   {
     "token": [
       "UIDENT",
       "Int"
     ],
-    "loc": "42:51-42:54"
+    "loc": "40:51-40:54"
   },
   {
     "token": "RBRACKET",
-    "loc": "42:54-42:55"
+    "loc": "40:54-40:55"
   },
   {
     "token": "RPAREN",
-    "loc": "42:55-42:56"
+    "loc": "40:55-40:56"
   },
   {
     "token": "THIN_ARROW",
-    "loc": "42:57-42:59"
+    "loc": "40:57-40:59"
   },
   {
     "token": [
       "UIDENT",
       "Unit"
     ],
-    "loc": "42:60-42:64"
+    "loc": "40:60-40:64"
   },
   {
     "token": "NORAISE",
-    "loc": "42:65-42:72"
+    "loc": "40:65-40:72"
   },
   {
     "token": "LBRACE",
-    "loc": "42:73-42:74"
+    "loc": "40:73-40:74"
   },
   {
     "token": "NEWLINE",
-    "loc": "42:74-42:75"
+    "loc": "40:74-40:75"
   },
   {
     "token": "FOR",
-    "loc": "43:3-43:6"
+    "loc": "41:3-41:6"
   },
   {
     "token": [
       "LIDENT",
       "x"
     ],
-    "loc": "43:7-43:8"
+    "loc": "41:7-41:8"
   },
   {
     "token": "IN",
-    "loc": "43:9-43:11"
+    "loc": "41:9-41:11"
   },
   {
     "token": [
       "LIDENT",
       "input"
     ],
-    "loc": "43:12-43:17"
+    "loc": "41:12-41:17"
   },
   {
     "token": "LBRACE",
-    "loc": "43:18-43:19"
+    "loc": "41:18-41:19"
   },
   {
     "token": "NEWLINE",
-    "loc": "43:19-43:20"
+    "loc": "41:19-41:20"
   },
   {
     "token": "MATCH",
-    "loc": "44:5-44:10"
+    "loc": "42:5-42:10"
   },
   {
     "token": [
       "LIDENT",
       "x"
     ],
-    "loc": "44:11-44:12"
+    "loc": "42:11-42:12"
   },
   {
     "token": "LBRACE",
-    "loc": "44:13-44:14"
+    "loc": "42:13-42:14"
   },
   {
     "token": "NEWLINE",
-    "loc": "44:14-44:15"
+    "loc": "42:14-42:15"
   },
   {
     "token": [
       "INT",
       "4"
     ],
-    "loc": "45:7-45:8"
+    "loc": "43:7-43:8"
   },
   {
     "token": "BAR",
-    "loc": "45:9-45:10"
+    "loc": "43:9-43:10"
   },
   {
     "token": [
       "INT",
       "2"
     ],
-    "loc": "45:11-45:12"
+    "loc": "43:11-43:12"
   },
   {
     "token": "FAT_ARROW",
-    "loc": "45:13-45:15"
+    "loc": "43:13-43:15"
   },
   {
     "token": [
       "LIDENT",
       "println"
     ],
-    "loc": "45:16-45:23"
+    "loc": "43:16-43:23"
   },
   {
     "token": "LPAREN",
-    "loc": "45:23-45:24"
+    "loc": "43:23-43:24"
   },
   {
     "token": [
       "STRING",
       "42"
     ],
-    "loc": "45:24-45:28"
+    "loc": "43:24-43:28"
   },
   {
     "token": "RPAREN",
-    "loc": "45:28-45:29"
+    "loc": "43:28-43:29"
   },
   {
     "token": [
       "SEMI",
       false
     ],
-    "loc": "45:29-45:29"
+    "loc": "43:29-43:29"
   },
   {
     "token": "NEWLINE",
-    "loc": "45:29-45:30"
+    "loc": "43:29-43:30"
   },
   {
     "token": "UNDERSCORE",
-    "loc": "46:7-46:8"
+    "loc": "44:7-44:8"
   },
   {
     "token": "FAT_ARROW",
-    "loc": "46:9-46:11"
+    "loc": "44:9-44:11"
   },
   {
     "token": [
       "LIDENT",
       "println"
     ],
-    "loc": "46:12-46:19"
+    "loc": "44:12-44:19"
   },
   {
     "token": "LPAREN",
-    "loc": "46:19-46:20"
+    "loc": "44:19-44:20"
   },
   {
     "token": [
       "STRING",
       "other"
     ],
-    "loc": "46:20-46:27"
+    "loc": "44:20-44:27"
   },
   {
     "token": "RPAREN",
-    "loc": "46:27-46:28"
+    "loc": "44:27-44:28"
   },
   {
     "token": "NEWLINE",
-    "loc": "46:28-46:29"
+    "loc": "44:28-44:29"
   },
   {
     "token": "RBRACE",
-    "loc": "47:5-47:6"
+    "loc": "45:5-45:6"
   },
   {
     "token": "NEWLINE",
-    "loc": "47:6-47:7"
+    "loc": "45:6-45:7"
   },
   {
     "token": "RBRACE",
-    "loc": "48:3-48:4"
+    "loc": "46:3-46:4"
   },
   {
     "token": "NEWLINE",
-    "loc": "48:4-48:5"
+    "loc": "46:4-46:5"
   },
   {
     "token": "RBRACE",
-    "loc": "49:1-49:2"
+    "loc": "47:1-47:2"
   },
   {
     "token": [
       "SEMI",
       false
     ],
-    "loc": "49:2-49:2"
+    "loc": "47:2-47:2"
   },
   {
     "token": "NEWLINE",
-    "loc": "49:2-49:3"
+    "loc": "47:2-47:3"
   },
   {
     "token": "NEWLINE",
-    "loc": "50:1-50:2"
+    "loc": "48:1-48:2"
   },
   {
     "token": "FN",
-    "loc": "51:1-51:3"
+    "loc": "49:1-49:3"
   },
   {
     "token": [
       "LIDENT",
       "init"
     ],
-    "loc": "51:4-51:8"
+    "loc": "49:4-49:8"
   },
   {
     "token": "LBRACE",
-    "loc": "51:9-51:10"
+    "loc": "49:9-49:10"
   },
   {
     "token": "NEWLINE",
-    "loc": "51:10-51:11"
+    "loc": "49:10-49:11"
   },
   {
     "token": [
       "LIDENT",
       "run_async"
     ],
-    "loc": "52:3-52:12"
+    "loc": "50:3-50:12"
   },
   {
     "token": "LPAREN",
-    "loc": "52:12-52:13"
-  },
-  {
-    "token": "FN",
-    "loc": "52:13-52:15"
+    "loc": "50:12-50:13"
   },
   {
     "token": "LPAREN",
-    "loc": "52:16-52:17"
+    "loc": "50:13-50:14"
   },
   {
     "token": "RPAREN",
-    "loc": "52:17-52:18"
+    "loc": "50:14-50:15"
   },
   {
-    "token": "LBRACE",
-    "loc": "52:19-52:20"
+    "token": "FAT_ARROW",
+    "loc": "50:16-50:18"
   },
   {
     "token": [
       "LIDENT",
       "join_in_loop_without_async"
     ],
-    "loc": "52:21-52:47"
+    "loc": "50:19-50:45"
   },
   {
     "token": "LPAREN",
-    "loc": "52:47-52:48"
+    "loc": "50:45-50:46"
   },
   {
     "token": "LBRACKET",
-    "loc": "52:48-52:49"
+    "loc": "50:46-50:47"
   },
   {
     "token": [
       "INT",
       "1"
     ],
-    "loc": "52:50-52:51"
+    "loc": "50:48-50:49"
   },
   {
     "token": "COMMA",
-    "loc": "52:51-52:52"
+    "loc": "50:49-50:50"
   },
   {
     "token": [
       "INT",
       "2"
     ],
-    "loc": "52:53-52:54"
+    "loc": "50:51-50:52"
   },
   {
     "token": "COMMA",
-    "loc": "52:54-52:55"
+    "loc": "50:52-50:53"
   },
   {
     "token": [
       "INT",
       "3"
     ],
-    "loc": "52:56-52:57"
+    "loc": "50:54-50:55"
   },
   {
     "token": "RBRACKET",
-    "loc": "52:58-52:59"
+    "loc": "50:56-50:57"
   },
   {
     "token": "RPAREN",
-    "loc": "52:59-52:60"
-  },
-  {
-    "token": "RBRACE",
-    "loc": "52:61-52:62"
+    "loc": "50:57-50:58"
   },
   {
     "token": "RPAREN",
-    "loc": "52:62-52:63"
+    "loc": "50:58-50:59"
   },
   {
     "token": "NEWLINE",
-    "loc": "52:63-52:64"
+    "loc": "50:59-50:60"
   },
   {
     "token": "RBRACE",
-    "loc": "53:1-53:2"
+    "loc": "51:1-51:2"
   },
   {
     "token": [
       "SEMI",
       false
     ],
-    "loc": "53:2-53:2"
+    "loc": "51:2-51:2"
   },
   {
     "token": "NEWLINE",
-    "loc": "53:2-53:3"
+    "loc": "51:2-51:3"
   },
   {
     "token": "EOF",
-    "loc": "54:1-54:1"
+    "loc": "52:1-52:1"
   }
 ]
\ No newline at end of file
diff --git a/test/sync_test/__snapshot__/pipeline_test_async_nested.json b/test/sync_test/__snapshot__/pipeline_test_async_nested.json
index 4244e170..426c2570 100644
--- a/test/sync_test/__snapshot__/pipeline_test_async_nested.json
+++ b/test/sync_test/__snapshot__/pipeline_test_async_nested.json
@@ -2551,41 +2551,110 @@
                                 "children": []
                               },
                               "body": {
-                                "kind": "Expr::Try",
+                                "kind": "Expr::Group",
                                 "loc": null,
                                 "children": {
-                                  "body": {
-                                    "kind": "Expr::Apply",
+                                  "expr": {
+                                    "kind": "Expr::Try",
                                     "loc": null,
                                     "children": {
-                                      "func": {
-                                        "kind": "Expr::Ident",
+                                      "body": {
+                                        "kind": "Expr::Apply",
                                         "loc": null,
                                         "children": {
-                                          "id": {
-                                            "kind": "Var",
+                                          "func": {
+                                            "kind": "Expr::Ident",
                                             "loc": null,
                                             "children": {
-                                              "name": {
-                                                "kind": "LongIdent::Ident",
+                                              "id": {
+                                                "kind": "Var",
                                                 "loc": null,
                                                 "children": {
-                                                  "value": "println"
+                                                  "name": {
+                                                    "kind": "LongIdent::Ident",
+                                                    "loc": null,
+                                                    "children": {
+                                                      "value": "println"
+                                                    }
+                                                  }
                                                 }
                                               }
                                             }
+                                          },
+                                          "args": {
+                                            "kind": "Expr::Apply::ArgumentList",
+                                            "loc": null,
+                                            "children": [
+                                              {
+                                                "kind": "Argument",
+                                                "loc": null,
+                                                "children": {
+                                                  "value": {
+                                                    "kind": "Expr::Apply",
+                                                    "loc": null,
+                                                    "children": {
+                                                      "func": {
+                                                        "kind": "Expr::Ident",
+                                                        "loc": null,
+                                                        "children": {
+                                                          "id": {
+                                                            "kind": "Var",
+                                                            "loc": null,
+                                                            "children": {
+                                                              "name": {
+                                                                "kind": "LongIdent::Ident",
+                                                                "loc": null,
+                                                                "children": {
+                                                                  "value": "err_in_pipe_lhs"
+                                                                }
+                                                              }
+                                                            }
+                                                          }
+                                                        }
+                                                      },
+                                                      "args": {
+                                                        "kind": "Expr::Apply::ArgumentList",
+                                                        "loc": null,
+                                                        "children": []
+                                                      },
+                                                      "attr": {
+                                                        "kind": "ApplyAttr::NoAttr",
+                                                        "loc": null,
+                                                        "children": {}
+                                                      }
+                                                    }
+                                                  },
+                                                  "kind": {
+                                                    "kind": "ArgumentKind::Positional",
+                                                    "loc": null,
+                                                    "children": {}
+                                                  }
+                                                }
+                                              }
+                                            ]
+                                          },
+                                          "attr": {
+                                            "kind": "ApplyAttr::NoAttr",
+                                            "loc": null,
+                                            "children": {}
                                           }
                                         }
                                       },
-                                      "args": {
-                                        "kind": "Expr::Apply::ArgumentList",
+                                      "catch": {
+                                        "kind": "Expr::Try::CaseList",
                                         "loc": null,
                                         "children": [
                                           {
-                                            "kind": "Argument",
+                                            "kind": "Case",
                                             "loc": null,
                                             "children": {
-                                              "value": {
+                                              "pattern": {
+                                                "kind": "Pattern::Any",
+                                                "loc": null,
+                                                "children": {}
+                                              },
+                                              "guard": null,
+                                              "body": {
                                                 "kind": "Expr::Apply",
                                                 "loc": null,
                                                 "children": {
@@ -2601,7 +2670,7 @@
                                                             "kind": "LongIdent::Ident",
                                                             "loc": null,
                                                             "children": {
-                                                              "value": "err_in_pipe_lhs"
+                                                              "value": "panic"
                                                             }
                                                           }
                                                         }
@@ -2619,79 +2688,21 @@
                                                     "children": {}
                                                   }
                                                 }
-                                              },
-                                              "kind": {
-                                                "kind": "ArgumentKind::Positional",
-                                                "loc": null,
-                                                "children": {}
                                               }
                                             }
                                           }
                                         ]
                                       },
-                                      "attr": {
-                                        "kind": "ApplyAttr::NoAttr",
-                                        "loc": null,
-                                        "children": {}
-                                      }
+                                      "catch_all": false,
+                                      "try_else": null,
+                                      "has_try": true
                                     }
                                   },
-                                  "catch": {
-                                    "kind": "Expr::Try::CaseList",
+                                  "group": {
+                                    "kind": "Group::Brace",
                                     "loc": null,
-                                    "children": [
-                                      {
-                                        "kind": "Case",
-                                        "loc": null,
-                                        "children": {
-                                          "pattern": {
-                                            "kind": "Pattern::Any",
-                                            "loc": null,
-                                            "children": {}
-                                          },
-                                          "guard": null,
-                                          "body": {
-                                            "kind": "Expr::Apply",
-                                            "loc": null,
-                                            "children": {
-                                              "func": {
-                                                "kind": "Expr::Ident",
-                                                "loc": null,
-                                                "children": {
-                                                  "id": {
-                                                    "kind": "Var",
-                                                    "loc": null,
-                                                    "children": {
-                                                      "name": {
-                                                        "kind": "LongIdent::Ident",
-                                                        "loc": null,
-                                                        "children": {
-                                                          "value": "panic"
-                                                        }
-                                                      }
-                                                    }
-                                                  }
-                                                }
-                                              },
-                                              "args": {
-                                                "kind": "Expr::Apply::ArgumentList",
-                                                "loc": null,
-                                                "children": []
-                                              },
-                                              "attr": {
-                                                "kind": "ApplyAttr::NoAttr",
-                                                "loc": null,
-                                                "children": {}
-                                              }
-                                            }
-                                          }
-                                        }
-                                      }
-                                    ]
-                                  },
-                                  "catch_all": false,
-                                  "try_else": null,
-                                  "has_try": true
+                                    "children": {}
+                                  }
                                 }
                               },
                               "return_type": null,
@@ -2701,7 +2712,7 @@
                                 "children": {}
                               },
                               "kind": {
-                                "kind": "FnKind::Lambda",
+                                "kind": "FnKind::Arrow",
                                 "loc": null,
                                 "children": {}
                               },
diff --git a/test/sync_test/__snapshot__/pipeline_test_async_nested.mbt b/test/sync_test/__snapshot__/pipeline_test_async_nested.mbt
index 2535d367..88ae2626 100644
--- a/test/sync_test/__snapshot__/pipeline_test_async_nested.mbt
+++ b/test/sync_test/__snapshot__/pipeline_test_async_nested.mbt
@@ -41,7 +41,7 @@ async fn err_in_pipe_lhs() -> Int raise {
 }
 
 fn init {
-  run_async(fn () {
+  run_async(() => {
     try println(err_in_pipe_lhs()) catch { _ => panic() }
   })
 }
diff --git a/test/sync_test/__snapshot__/pipeline_test_async_nested.mbt.tokens.json b/test/sync_test/__snapshot__/pipeline_test_async_nested.mbt.tokens.json
index a07341f3..6acb3360 100644
--- a/test/sync_test/__snapshot__/pipeline_test_async_nested.mbt.tokens.json
+++ b/test/sync_test/__snapshot__/pipeline_test_async_nested.mbt.tokens.json
@@ -1402,17 +1402,17 @@
     "token": "LPAREN",
     "loc": "44:12-44:13"
   },
-  {
-    "token": "FN",
-    "loc": "44:13-44:15"
-  },
   {
     "token": "LPAREN",
-    "loc": "44:16-44:17"
+    "loc": "44:13-44:14"
   },
   {
     "token": "RPAREN",
-    "loc": "44:17-44:18"
+    "loc": "44:14-44:15"
+  },
+  {
+    "token": "FAT_ARROW",
+    "loc": "44:16-44:18"
   },
   {
     "token": "LBRACE",
diff --git a/test/sync_test/__snapshot__/pipeline_test_async_nested_fn.json b/test/sync_test/__snapshot__/pipeline_test_async_nested_fn.json
index 4648acff..be98c19f 100644
--- a/test/sync_test/__snapshot__/pipeline_test_async_nested_fn.json
+++ b/test/sync_test/__snapshot__/pipeline_test_async_nested_fn.json
@@ -1052,7 +1052,7 @@
                                         "children": {}
                                       },
                                       "kind": {
-                                        "kind": "FnKind::Lambda",
+                                        "kind": "FnKind::Arrow",
                                         "loc": null,
                                         "children": {}
                                       },
@@ -1338,7 +1338,7 @@
                                 "children": {}
                               },
                               "kind": {
-                                "kind": "FnKind::Lambda",
+                                "kind": "FnKind::Arrow",
                                 "loc": null,
                                 "children": {}
                               },
diff --git a/test/sync_test/__snapshot__/pipeline_test_async_nested_fn.mbt b/test/sync_test/__snapshot__/pipeline_test_async_nested_fn.mbt
index b1858402..6a9c6e3d 100644
--- a/test/sync_test/__snapshot__/pipeline_test_async_nested_fn.mbt
+++ b/test/sync_test/__snapshot__/pipeline_test_async_nested_fn.mbt
@@ -12,12 +12,10 @@ async fn worker() -> Int noraise {
 }
 
 async fn f() -> Unit noraise {
-  spawn(fn () { println(worker()) })
+  spawn(() => println(worker()))
   println(worker() + 1)
 }
 
 fn init {
-  spawn(fn () {
-    f()
-  })
+  spawn(() => f())
 }
diff --git a/test/sync_test/__snapshot__/pipeline_test_async_nested_fn.mbt.tokens.json b/test/sync_test/__snapshot__/pipeline_test_async_nested_fn.mbt.tokens.json
index a0a903d4..9ea97d61 100644
--- a/test/sync_test/__snapshot__/pipeline_test_async_nested_fn.mbt.tokens.json
+++ b/test/sync_test/__snapshot__/pipeline_test_async_nested_fn.mbt.tokens.json
@@ -543,70 +543,62 @@
     "token": "LPAREN",
     "loc": "15:8-15:9"
   },
-  {
-    "token": "FN",
-    "loc": "15:9-15:11"
-  },
   {
     "token": "LPAREN",
-    "loc": "15:12-15:13"
+    "loc": "15:9-15:10"
   },
   {
     "token": "RPAREN",
-    "loc": "15:13-15:14"
+    "loc": "15:10-15:11"
   },
   {
-    "token": "LBRACE",
-    "loc": "15:15-15:16"
+    "token": "FAT_ARROW",
+    "loc": "15:12-15:14"
   },
   {
     "token": [
       "LIDENT",
       "println"
     ],
-    "loc": "15:17-15:24"
+    "loc": "15:15-15:22"
   },
   {
     "token": "LPAREN",
-    "loc": "15:24-15:25"
+    "loc": "15:22-15:23"
   },
   {
     "token": [
       "LIDENT",
       "worker"
     ],
-    "loc": "15:25-15:31"
+    "loc": "15:23-15:29"
   },
   {
     "token": "LPAREN",
-    "loc": "15:31-15:32"
+    "loc": "15:29-15:30"
   },
   {
     "token": "RPAREN",
-    "loc": "15:32-15:33"
+    "loc": "15:30-15:31"
   },
   {
     "token": "RPAREN",
-    "loc": "15:33-15:34"
-  },
-  {
-    "token": "RBRACE",
-    "loc": "15:35-15:36"
+    "loc": "15:31-15:32"
   },
   {
     "token": "RPAREN",
-    "loc": "15:36-15:37"
+    "loc": "15:32-15:33"
   },
   {
     "token": [
       "SEMI",
       false
     ],
-    "loc": "15:37-15:37"
+    "loc": "15:33-15:33"
   },
   {
     "token": "NEWLINE",
-    "loc": "15:37-15:38"
+    "loc": "15:33-15:34"
   },
   {
     "token": [
@@ -702,74 +694,58 @@
     "token": "LPAREN",
     "loc": "20:8-20:9"
   },
-  {
-    "token": "FN",
-    "loc": "20:9-20:11"
-  },
   {
     "token": "LPAREN",
-    "loc": "20:12-20:13"
+    "loc": "20:9-20:10"
   },
   {
     "token": "RPAREN",
-    "loc": "20:13-20:14"
-  },
-  {
-    "token": "LBRACE",
-    "loc": "20:15-20:16"
+    "loc": "20:10-20:11"
   },
   {
-    "token": "NEWLINE",
-    "loc": "20:16-20:17"
+    "token": "FAT_ARROW",
+    "loc": "20:12-20:14"
   },
   {
     "token": [
       "LIDENT",
       "f"
     ],
-    "loc": "21:5-21:6"
+    "loc": "20:15-20:16"
   },
   {
     "token": "LPAREN",
-    "loc": "21:6-21:7"
+    "loc": "20:16-20:17"
   },
   {
     "token": "RPAREN",
-    "loc": "21:7-21:8"
-  },
-  {
-    "token": "NEWLINE",
-    "loc": "21:8-21:9"
-  },
-  {
-    "token": "RBRACE",
-    "loc": "22:3-22:4"
+    "loc": "20:17-20:18"
   },
   {
     "token": "RPAREN",
-    "loc": "22:4-22:5"
+    "loc": "20:18-20:19"
   },
   {
     "token": "NEWLINE",
-    "loc": "22:5-22:6"
+    "loc": "20:19-20:20"
   },
   {
     "token": "RBRACE",
-    "loc": "23:1-23:2"
+    "loc": "21:1-21:2"
   },
   {
     "token": [
       "SEMI",
       false
     ],
-    "loc": "23:2-23:2"
+    "loc": "21:2-21:2"
   },
   {
     "token": "NEWLINE",
-    "loc": "23:2-23:3"
+    "loc": "21:2-21:3"
   },
   {
     "token": "EOF",
-    "loc": "24:1-24:1"
+    "loc": "22:1-22:1"
   }
 ]
\ No newline at end of file
diff --git a/test/sync_test/__snapshot__/pipeline_test_async_question.json b/test/sync_test/__snapshot__/pipeline_test_async_question.json
index b5706d45..9ed5de45 100644
--- a/test/sync_test/__snapshot__/pipeline_test_async_question.json
+++ b/test/sync_test/__snapshot__/pipeline_test_async_question.json
@@ -1211,7 +1211,7 @@
                                         "children": {}
                                       },
                                       "kind": {
-                                        "kind": "FnKind::Lambda",
+                                        "kind": "FnKind::Arrow",
                                         "loc": null,
                                         "children": {}
                                       },
@@ -1408,7 +1408,7 @@
                                     "children": {}
                                   },
                                   "kind": {
-                                    "kind": "FnKind::Lambda",
+                                    "kind": "FnKind::Arrow",
                                     "loc": null,
                                     "children": {}
                                   },
diff --git a/test/sync_test/__snapshot__/pipeline_test_async_question.mbt b/test/sync_test/__snapshot__/pipeline_test_async_question.mbt
index deda8f18..9e8f0c10 100644
--- a/test/sync_test/__snapshot__/pipeline_test_async_question.mbt
+++ b/test/sync_test/__snapshot__/pipeline_test_async_question.mbt
@@ -13,10 +13,6 @@ async fn f(c : Bool) -> Int raise Err {
 }
 
 fn main {
-  run_async(fn () {
-    println(try? f(true))
-  })
-  run_async(fn () {
-    println(try? f(false))
-  })
+  run_async(() => println(try? f(true)))
+  run_async(() => println(try? f(false)))
 }
diff --git a/test/sync_test/__snapshot__/pipeline_test_async_question.mbt.tokens.json b/test/sync_test/__snapshot__/pipeline_test_async_question.mbt.tokens.json
index facc2487..0c7b4fab 100644
--- a/test/sync_test/__snapshot__/pipeline_test_async_question.mbt.tokens.json
+++ b/test/sync_test/__snapshot__/pipeline_test_async_question.mbt.tokens.json
@@ -600,189 +600,157 @@
     "token": "LPAREN",
     "loc": "16:12-16:13"
   },
-  {
-    "token": "FN",
-    "loc": "16:13-16:15"
-  },
   {
     "token": "LPAREN",
-    "loc": "16:16-16:17"
+    "loc": "16:13-16:14"
   },
   {
     "token": "RPAREN",
-    "loc": "16:17-16:18"
-  },
-  {
-    "token": "LBRACE",
-    "loc": "16:19-16:20"
+    "loc": "16:14-16:15"
   },
   {
-    "token": "NEWLINE",
-    "loc": "16:20-16:21"
+    "token": "FAT_ARROW",
+    "loc": "16:16-16:18"
   },
   {
     "token": [
       "LIDENT",
       "println"
     ],
-    "loc": "17:5-17:12"
+    "loc": "16:19-16:26"
   },
   {
     "token": "LPAREN",
-    "loc": "17:12-17:13"
+    "loc": "16:26-16:27"
   },
   {
     "token": "TRY_QUESTION",
-    "loc": "17:13-17:17"
+    "loc": "16:27-16:31"
   },
   {
     "token": [
       "LIDENT",
       "f"
     ],
-    "loc": "17:18-17:19"
+    "loc": "16:32-16:33"
   },
   {
     "token": "LPAREN",
-    "loc": "17:19-17:20"
+    "loc": "16:33-16:34"
   },
   {
     "token": "TRUE",
-    "loc": "17:20-17:24"
+    "loc": "16:34-16:38"
   },
   {
     "token": "RPAREN",
-    "loc": "17:24-17:25"
+    "loc": "16:38-16:39"
   },
   {
     "token": "RPAREN",
-    "loc": "17:25-17:26"
-  },
-  {
-    "token": "NEWLINE",
-    "loc": "17:26-17:27"
-  },
-  {
-    "token": "RBRACE",
-    "loc": "18:3-18:4"
+    "loc": "16:39-16:40"
   },
   {
     "token": "RPAREN",
-    "loc": "18:4-18:5"
+    "loc": "16:40-16:41"
   },
   {
     "token": [
       "SEMI",
       false
     ],
-    "loc": "18:5-18:5"
+    "loc": "16:41-16:41"
   },
   {
     "token": "NEWLINE",
-    "loc": "18:5-18:6"
+    "loc": "16:41-16:42"
   },
   {
     "token": [
       "LIDENT",
       "run_async"
     ],
-    "loc": "19:3-19:12"
+    "loc": "17:3-17:12"
   },
   {
     "token": "LPAREN",
-    "loc": "19:12-19:13"
-  },
-  {
-    "token": "FN",
-    "loc": "19:13-19:15"
+    "loc": "17:12-17:13"
   },
   {
     "token": "LPAREN",
-    "loc": "19:16-19:17"
+    "loc": "17:13-17:14"
   },
   {
     "token": "RPAREN",
-    "loc": "19:17-19:18"
+    "loc": "17:14-17:15"
   },
   {
-    "token": "LBRACE",
-    "loc": "19:19-19:20"
-  },
-  {
-    "token": "NEWLINE",
-    "loc": "19:20-19:21"
+    "token": "FAT_ARROW",
+    "loc": "17:16-17:18"
   },
   {
     "token": [
       "LIDENT",
       "println"
     ],
-    "loc": "20:5-20:12"
+    "loc": "17:19-17:26"
   },
   {
     "token": "LPAREN",
-    "loc": "20:12-20:13"
+    "loc": "17:26-17:27"
   },
   {
     "token": "TRY_QUESTION",
-    "loc": "20:13-20:17"
+    "loc": "17:27-17:31"
   },
   {
     "token": [
       "LIDENT",
       "f"
     ],
-    "loc": "20:18-20:19"
+    "loc": "17:32-17:33"
   },
   {
     "token": "LPAREN",
-    "loc": "20:19-20:20"
+    "loc": "17:33-17:34"
   },
   {
     "token": "FALSE",
-    "loc": "20:20-20:25"
+    "loc": "17:34-17:39"
   },
   {
     "token": "RPAREN",
-    "loc": "20:25-20:26"
+    "loc": "17:39-17:40"
   },
   {
     "token": "RPAREN",
-    "loc": "20:26-20:27"
-  },
-  {
-    "token": "NEWLINE",
-    "loc": "20:27-20:28"
-  },
-  {
-    "token": "RBRACE",
-    "loc": "21:3-21:4"
+    "loc": "17:40-17:41"
   },
   {
     "token": "RPAREN",
-    "loc": "21:4-21:5"
+    "loc": "17:41-17:42"
   },
   {
     "token": "NEWLINE",
-    "loc": "21:5-21:6"
+    "loc": "17:42-17:43"
   },
   {
     "token": "RBRACE",
-    "loc": "22:1-22:2"
+    "loc": "18:1-18:2"
   },
   {
     "token": [
       "SEMI",
       false
     ],
-    "loc": "22:2-22:2"
+    "loc": "18:2-18:2"
   },
   {
     "token": "NEWLINE",
-    "loc": "22:2-22:3"
+    "loc": "18:2-18:3"
   },
   {
     "token": "EOF",
-    "loc": "23:1-23:1"
+    "loc": "19:1-19:1"
   }
 ]
\ No newline at end of file
diff --git a/test/sync_test/__snapshot__/pipeline_test_async_run_in_suspend.json b/test/sync_test/__snapshot__/pipeline_test_async_run_in_suspend.json
index e6bc5f8b..60666779 100644
--- a/test/sync_test/__snapshot__/pipeline_test_async_run_in_suspend.json
+++ b/test/sync_test/__snapshot__/pipeline_test_async_run_in_suspend.json
@@ -815,82 +815,93 @@
                                                             "children": []
                                                           },
                                                           "body": {
-                                                            "kind": "Expr::Apply",
+                                                            "kind": "Expr::Group",
                                                             "loc": null,
                                                             "children": {
-                                                              "func": {
-                                                                "kind": "Expr::Ident",
+                                                              "expr": {
+                                                                "kind": "Expr::Apply",
                                                                 "loc": null,
                                                                 "children": {
-                                                                  "id": {
-                                                                    "kind": "Var",
+                                                                  "func": {
+                                                                    "kind": "Expr::Ident",
                                                                     "loc": null,
                                                                     "children": {
-                                                                      "name": {
-                                                                        "kind": "LongIdent::Ident",
+                                                                      "id": {
+                                                                        "kind": "Var",
                                                                         "loc": null,
                                                                         "children": {
-                                                                          "value": "println"
+                                                                          "name": {
+                                                                            "kind": "LongIdent::Ident",
+                                                                            "loc": null,
+                                                                            "children": {
+                                                                              "value": "println"
+                                                                            }
+                                                                          }
                                                                         }
                                                                       }
                                                                     }
-                                                                  }
-                                                                }
-                                                              },
-                                                              "args": {
-                                                                "kind": "Expr::Apply::ArgumentList",
-                                                                "loc": null,
-                                                                "children": [
-                                                                  {
-                                                                    "kind": "Argument",
+                                                                  },
+                                                                  "args": {
+                                                                    "kind": "Expr::Apply::ArgumentList",
                                                                     "loc": null,
-                                                                    "children": {
-                                                                      "value": {
-                                                                        "kind": "Expr::Apply",
+                                                                    "children": [
+                                                                      {
+                                                                        "kind": "Argument",
                                                                         "loc": null,
                                                                         "children": {
-                                                                          "func": {
-                                                                            "kind": "Expr::Ident",
+                                                                          "value": {
+                                                                            "kind": "Expr::Apply",
                                                                             "loc": null,
                                                                             "children": {
-                                                                              "id": {
-                                                                                "kind": "Var",
+                                                                              "func": {
+                                                                                "kind": "Expr::Ident",
                                                                                 "loc": null,
                                                                                 "children": {
-                                                                                  "name": {
-                                                                                    "kind": "LongIdent::Ident",
+                                                                                  "id": {
+                                                                                    "kind": "Var",
                                                                                     "loc": null,
                                                                                     "children": {
-                                                                                      "value": "f"
+                                                                                      "name": {
+                                                                                        "kind": "LongIdent::Ident",
+                                                                                        "loc": null,
+                                                                                        "children": {
+                                                                                          "value": "f"
+                                                                                        }
+                                                                                      }
                                                                                     }
                                                                                   }
                                                                                 }
+                                                                              },
+                                                                              "args": {
+                                                                                "kind": "Expr::Apply::ArgumentList",
+                                                                                "loc": null,
+                                                                                "children": []
+                                                                              },
+                                                                              "attr": {
+                                                                                "kind": "ApplyAttr::NoAttr",
+                                                                                "loc": null,
+                                                                                "children": {}
                                                                               }
                                                                             }
                                                                           },
-                                                                          "args": {
-                                                                            "kind": "Expr::Apply::ArgumentList",
-                                                                            "loc": null,
-                                                                            "children": []
-                                                                          },
-                                                                          "attr": {
-                                                                            "kind": "ApplyAttr::NoAttr",
+                                                                          "kind": {
+                                                                            "kind": "ArgumentKind::Positional",
                                                                             "loc": null,
                                                                             "children": {}
                                                                           }
                                                                         }
-                                                                      },
-                                                                      "kind": {
-                                                                        "kind": "ArgumentKind::Positional",
-                                                                        "loc": null,
-                                                                        "children": {}
                                                                       }
-                                                                    }
+                                                                    ]
+                                                                  },
+                                                                  "attr": {
+                                                                    "kind": "ApplyAttr::NoAttr",
+                                                                    "loc": null,
+                                                                    "children": {}
                                                                   }
-                                                                ]
+                                                                }
                                                               },
-                                                              "attr": {
-                                                                "kind": "ApplyAttr::NoAttr",
+                                                              "group": {
+                                                                "kind": "Group::Brace",
                                                                 "loc": null,
                                                                 "children": {}
                                                               }
@@ -903,7 +914,7 @@
                                                             "children": {}
                                                           },
                                                           "kind": {
-                                                            "kind": "FnKind::Lambda",
+                                                            "kind": "FnKind::Arrow",
                                                             "loc": null,
                                                             "children": {}
                                                           },
diff --git a/test/sync_test/__snapshot__/pipeline_test_async_run_in_suspend.mbt b/test/sync_test/__snapshot__/pipeline_test_async_run_in_suspend.mbt
index cf96b3d1..71ee1dc4 100644
--- a/test/sync_test/__snapshot__/pipeline_test_async_run_in_suspend.mbt
+++ b/test/sync_test/__snapshot__/pipeline_test_async_run_in_suspend.mbt
@@ -7,7 +7,7 @@ async fn f() -> Int noraise {
 
 async fn run_in_suspend() -> Unit noraise {
   suspend(fn (k) {
-    run_async(fn () {
+    run_async(() => {
       println(f())
     })
     k(())
diff --git a/test/sync_test/__snapshot__/pipeline_test_async_run_in_suspend.mbt.tokens.json b/test/sync_test/__snapshot__/pipeline_test_async_run_in_suspend.mbt.tokens.json
index 31de1d56..d3418101 100644
--- a/test/sync_test/__snapshot__/pipeline_test_async_run_in_suspend.mbt.tokens.json
+++ b/test/sync_test/__snapshot__/pipeline_test_async_run_in_suspend.mbt.tokens.json
@@ -436,17 +436,17 @@
     "token": "LPAREN",
     "loc": "10:14-10:15"
   },
-  {
-    "token": "FN",
-    "loc": "10:15-10:17"
-  },
   {
     "token": "LPAREN",
-    "loc": "10:18-10:19"
+    "loc": "10:15-10:16"
   },
   {
     "token": "RPAREN",
-    "loc": "10:19-10:20"
+    "loc": "10:16-10:17"
+  },
+  {
+    "token": "FAT_ARROW",
+    "loc": "10:18-10:20"
   },
   {
     "token": "LBRACE",
diff --git a/test/sync_test/__snapshot__/pipeline_test_async_trait.json b/test/sync_test/__snapshot__/pipeline_test_async_trait.json
index 789bf90e..8990ab0c 100644
--- a/test/sync_test/__snapshot__/pipeline_test_async_trait.json
+++ b/test/sync_test/__snapshot__/pipeline_test_async_trait.json
@@ -4013,109 +4013,18 @@
                                             "children": []
                                           },
                                           "body": {
-                                            "kind": "Expr::Try",
+                                            "kind": "Expr::Group",
                                             "loc": null,
                                             "children": {
-                                              "body": {
-                                                "kind": "Expr::Group",
+                                              "expr": {
+                                                "kind": "Expr::Try",
                                                 "loc": null,
                                                 "children": {
-                                                  "expr": {
-                                                    "kind": "Expr::Apply",
+                                                  "body": {
+                                                    "kind": "Expr::Group",
                                                     "loc": null,
                                                     "children": {
-                                                      "func": {
-                                                        "kind": "Expr::Ident",
-                                                        "loc": null,
-                                                        "children": {
-                                                          "id": {
-                                                            "kind": "Var",
-                                                            "loc": null,
-                                                            "children": {
-                                                              "name": {
-                                                                "kind": "LongIdent::Ident",
-                                                                "loc": null,
-                                                                "children": {
-                                                                  "value": "is_balanced_poly"
-                                                                }
-                                                              }
-                                                            }
-                                                          }
-                                                        }
-                                                      },
-                                                      "args": {
-                                                        "kind": "Expr::Apply::ArgumentList",
-                                                        "loc": null,
-                                                        "children": [
-                                                          {
-                                                            "kind": "Argument",
-                                                            "loc": null,
-                                                            "children": {
-                                                              "value": {
-                                                                "kind": "Expr::Ident",
-                                                                "loc": null,
-                                                                "children": {
-                                                                  "id": {
-                                                                    "kind": "Var",
-                                                                    "loc": null,
-                                                                    "children": {
-                                                                      "name": {
-                                                                        "kind": "LongIdent::Ident",
-                                                                        "loc": null,
-                                                                        "children": {
-                                                                          "value": "input"
-                                                                        }
-                                                                      }
-                                                                    }
-                                                                  }
-                                                                }
-                                                              },
-                                                              "kind": {
-                                                                "kind": "ArgumentKind::Positional",
-                                                                "loc": null,
-                                                                "children": {}
-                                                              }
-                                                            }
-                                                          }
-                                                        ]
-                                                      },
-                                                      "attr": {
-                                                        "kind": "ApplyAttr::NoAttr",
-                                                        "loc": null,
-                                                        "children": {}
-                                                      }
-                                                    }
-                                                  },
-                                                  "group": {
-                                                    "kind": "Group::Brace",
-                                                    "loc": null,
-                                                    "children": {}
-                                                  }
-                                                }
-                                              },
-                                              "catch": {
-                                                "kind": "Expr::Try::CaseList",
-                                                "loc": null,
-                                                "children": [
-                                                  {
-                                                    "kind": "Case",
-                                                    "loc": null,
-                                                    "children": {
-                                                      "pattern": {
-                                                        "kind": "Pattern::Var",
-                                                        "loc": null,
-                                                        "children": {
-                                                          "value": {
-                                                            "kind": "Binder",
-                                                            "loc": null,
-                                                            "children": {
-                                                              "name": "err"
-                                                            }
-                                                          }
-                                                        }
-                                                      },
-                                                      "guard": null,
-                                                      "body": {
+                                                      "expr": {
                                                         "kind": "Expr::Apply",
                                                         "loc": null,
                                                         "children": {
@@ -4131,7 +4040,7 @@
                                                                     "kind": "LongIdent::Ident",
                                                                     "loc": null,
                                                                     "children": {
-                                                                      "value": "println"
+                                                                      "value": "is_balanced_poly"
                                                                     }
                                                                   }
                                                                 }
@@ -4158,7 +4067,7 @@
                                                                             "kind": "LongIdent::Ident",
                                                                             "loc": null,
                                                                             "children": {
-                                                                              "value": "err"
+                                                                              "value": "input"
                                                                             }
                                                                           }
                                                                         }
@@ -4180,91 +4089,193 @@
                                                             "children": {}
                                                           }
                                                         }
+                                                      },
+                                                      "group": {
+                                                        "kind": "Group::Brace",
+                                                        "loc": null,
+                                                        "children": {}
                                                       }
                                                     }
-                                                  }
-                                                ]
-                                              },
-                                              "catch_all": false,
-                                              "try_else": {
-                                                "kind": "Expr::Try::CaseList",
-                                                "loc": null,
-                                                "children": [
-                                                  {
-                                                    "kind": "Case",
+                                                  },
+                                                  "catch": {
+                                                    "kind": "Expr::Try::CaseList",
                                                     "loc": null,
-                                                    "children": {
-                                                      "pattern": {
-                                                        "kind": "Pattern::Any",
-                                                        "loc": null,
-                                                        "children": {}
-                                                      },
-                                                      "guard": null,
-                                                      "body": {
-                                                        "kind": "Expr::Apply",
+                                                    "children": [
+                                                      {
+                                                        "kind": "Case",
                                                         "loc": null,
                                                         "children": {
-                                                          "func": {
-                                                            "kind": "Expr::Ident",
+                                                          "pattern": {
+                                                            "kind": "Pattern::Var",
                                                             "loc": null,
                                                             "children": {
-                                                              "id": {
-                                                                "kind": "Var",
+                                                              "value": {
+                                                                "kind": "Binder",
                                                                 "loc": null,
                                                                 "children": {
-                                                                  "name": {
-                                                                    "kind": "LongIdent::Ident",
+                                                                  "name": "err"
+                                                                }
+                                                              }
+                                                            }
+                                                          },
+                                                          "guard": null,
+                                                          "body": {
+                                                            "kind": "Expr::Apply",
+                                                            "loc": null,
+                                                            "children": {
+                                                              "func": {
+                                                                "kind": "Expr::Ident",
+                                                                "loc": null,
+                                                                "children": {
+                                                                  "id": {
+                                                                    "kind": "Var",
                                                                     "loc": null,
                                                                     "children": {
-                                                                      "value": "println"
+                                                                      "name": {
+                                                                        "kind": "LongIdent::Ident",
+                                                                        "loc": null,
+                                                                        "children": {
+                                                                          "value": "println"
+                                                                        }
+                                                                      }
                                                                     }
                                                                   }
                                                                 }
+                                                              },
+                                                              "args": {
+                                                                "kind": "Expr::Apply::ArgumentList",
+                                                                "loc": null,
+                                                                "children": [
+                                                                  {
+                                                                    "kind": "Argument",
+                                                                    "loc": null,
+                                                                    "children": {
+                                                                      "value": {
+                                                                        "kind": "Expr::Ident",
+                                                                        "loc": null,
+                                                                        "children": {
+                                                                          "id": {
+                                                                            "kind": "Var",
+                                                                            "loc": null,
+                                                                            "children": {
+                                                                              "name": {
+                                                                                "kind": "LongIdent::Ident",
+                                                                                "loc": null,
+                                                                                "children": {
+                                                                                  "value": "err"
+                                                                                }
+                                                                              }
+                                                                            }
+                                                                          }
+                                                                        }
+                                                                      },
+                                                                      "kind": {
+                                                                        "kind": "ArgumentKind::Positional",
+                                                                        "loc": null,
+                                                                        "children": {}
+                                                                      }
+                                                                    }
+                                                                  }
+                                                                ]
+                                                              },
+                                                              "attr": {
+                                                                "kind": "ApplyAttr::NoAttr",
+                                                                "loc": null,
+                                                                "children": {}
                                                               }
                                                             }
+                                                          }
+                                                        }
+                                                      }
+                                                    ]
+                                                  },
+                                                  "catch_all": false,
+                                                  "try_else": {
+                                                    "kind": "Expr::Try::CaseList",
+                                                    "loc": null,
+                                                    "children": [
+                                                      {
+                                                        "kind": "Case",
+                                                        "loc": null,
+                                                        "children": {
+                                                          "pattern": {
+                                                            "kind": "Pattern::Any",
+                                                            "loc": null,
+                                                            "children": {}
                                                           },
-                                                          "args": {
-                                                            "kind": "Expr::Apply::ArgumentList",
+                                                          "guard": null,
+                                                          "body": {
+                                                            "kind": "Expr::Apply",
                                                             "loc": null,
-                                                            "children": [
-                                                              {
-                                                                "kind": "Argument",
+                                                            "children": {
+                                                              "func": {
+                                                                "kind": "Expr::Ident",
                                                                 "loc": null,
                                                                 "children": {
-                                                                  "value": {
-                                                                    "kind": "Expr::Constant",
+                                                                  "id": {
+                                                                    "kind": "Var",
                                                                     "loc": null,
                                                                     "children": {
-                                                                      "constant": {
-                                                                        "kind": "Constant::String",
+                                                                      "name": {
+                                                                        "kind": "LongIdent::Ident",
                                                                         "loc": null,
                                                                         "children": {
-                                                                          "value": "is balanced"
+                                                                          "value": "println"
                                                                         }
                                                                       }
                                                                     }
-                                                                  },
-                                                                  "kind": {
-                                                                    "kind": "ArgumentKind::Positional",
-                                                                    "loc": null,
-                                                                    "children": {}
                                                                   }
                                                                 }
+                                                              },
+                                                              "args": {
+                                                                "kind": "Expr::Apply::ArgumentList",
+                                                                "loc": null,
+                                                                "children": [
+                                                                  {
+                                                                    "kind": "Argument",
+                                                                    "loc": null,
+                                                                    "children": {
+                                                                      "value": {
+                                                                        "kind": "Expr::Constant",
+                                                                        "loc": null,
+                                                                        "children": {
+                                                                          "constant": {
+                                                                            "kind": "Constant::String",
+                                                                            "loc": null,
+                                                                            "children": {
+                                                                              "value": "is balanced"
+                                                                            }
+                                                                          }
+                                                                        }
+                                                                      },
+                                                                      "kind": {
+                                                                        "kind": "ArgumentKind::Positional",
+                                                                        "loc": null,
+                                                                        "children": {}
+                                                                      }
+                                                                    }
+                                                                  }
+                                                                ]
+                                                              },
+                                                              "attr": {
+                                                                "kind": "ApplyAttr::NoAttr",
+                                                                "loc": null,
+                                                                "children": {}
                                                               }
-                                                            ]
-                                                          },
-                                                          "attr": {
-                                                            "kind": "ApplyAttr::NoAttr",
-                                                            "loc": null,
-                                                            "children": {}
+                                                            }
                                                           }
                                                         }
                                                       }
-                                                    }
-                                                  }
-                                                ]
+                                                    ]
+                                                  },
+                                                  "has_try": true
+                                                }
                                               },
-                                              "has_try": true
+                                              "group": {
+                                                "kind": "Group::Brace",
+                                                "loc": null,
+                                                "children": {}
+                                              }
                                             }
                                           },
                                           "return_type": null,
@@ -4274,7 +4285,7 @@
                                             "children": {}
                                           },
                                           "kind": {
-                                            "kind": "FnKind::Lambda",
+                                            "kind": "FnKind::Arrow",
                                             "loc": null,
                                             "children": {}
                                           },
@@ -6608,109 +6619,18 @@
                                             "children": []
                                           },
                                           "body": {
-                                            "kind": "Expr::Try",
+                                            "kind": "Expr::Group",
                                             "loc": null,
                                             "children": {
-                                              "body": {
-                                                "kind": "Expr::Group",
+                                              "expr": {
+                                                "kind": "Expr::Try",
                                                 "loc": null,
                                                 "children": {
-                                                  "expr": {
-                                                    "kind": "Expr::Apply",
+                                                  "body": {
+                                                    "kind": "Expr::Group",
                                                     "loc": null,
                                                     "children": {
-                                                      "func": {
-                                                        "kind": "Expr::Ident",
-                                                        "loc": null,
-                                                        "children": {
-                                                          "id": {
-                                                            "kind": "Var",
-                                                            "loc": null,
-                                                            "children": {
-                                                              "name": {
-                                                                "kind": "LongIdent::Ident",
-                                                                "loc": null,
-                                                                "children": {
-                                                                  "value": "is_balanced_obj"
-                                                                }
-                                                              }
-                                                            }
-                                                          }
-                                                        }
-                                                      },
-                                                      "args": {
-                                                        "kind": "Expr::Apply::ArgumentList",
-                                                        "loc": null,
-                                                        "children": [
-                                                          {
-                                                            "kind": "Argument",
-                                                            "loc": null,
-                                                            "children": {
-                                                              "value": {
-                                                                "kind": "Expr::Ident",
-                                                                "loc": null,
-                                                                "children": {
-                                                                  "id": {
-                                                                    "kind": "Var",
-                                                                    "loc": null,
-                                                                    "children": {
-                                                                      "name": {
-                                                                        "kind": "LongIdent::Ident",
-                                                                        "loc": null,
-                                                                        "children": {
-                                                                          "value": "input"
-                                                                        }
-                                                                      }
-                                                                    }
-                                                                  }
-                                                                }
-                                                              },
-                                                              "kind": {
-                                                                "kind": "ArgumentKind::Positional",
-                                                                "loc": null,
-                                                                "children": {}
-                                                              }
-                                                            }
-                                                          }
-                                                        ]
-                                                      },
-                                                      "attr": {
-                                                        "kind": "ApplyAttr::NoAttr",
-                                                        "loc": null,
-                                                        "children": {}
-                                                      }
-                                                    }
-                                                  },
-                                                  "group": {
-                                                    "kind": "Group::Brace",
-                                                    "loc": null,
-                                                    "children": {}
-                                                  }
-                                                }
-                                              },
-                                              "catch": {
-                                                "kind": "Expr::Try::CaseList",
-                                                "loc": null,
-                                                "children": [
-                                                  {
-                                                    "kind": "Case",
-                                                    "loc": null,
-                                                    "children": {
-                                                      "pattern": {
-                                                        "kind": "Pattern::Var",
-                                                        "loc": null,
-                                                        "children": {
-                                                          "value": {
-                                                            "kind": "Binder",
-                                                            "loc": null,
-                                                            "children": {
-                                                              "name": "err"
-                                                            }
-                                                          }
-                                                        }
-                                                      },
-                                                      "guard": null,
-                                                      "body": {
+                                                      "expr": {
                                                         "kind": "Expr::Apply",
                                                         "loc": null,
                                                         "children": {
@@ -6726,7 +6646,7 @@
                                                                     "kind": "LongIdent::Ident",
                                                                     "loc": null,
                                                                     "children": {
-                                                                      "value": "println"
+                                                                      "value": "is_balanced_obj"
                                                                     }
                                                                   }
                                                                 }
@@ -6753,7 +6673,7 @@
                                                                             "kind": "LongIdent::Ident",
                                                                             "loc": null,
                                                                             "children": {
-                                                                              "value": "err"
+                                                                              "value": "input"
                                                                             }
                                                                           }
                                                                         }
@@ -6775,91 +6695,193 @@
                                                             "children": {}
                                                           }
                                                         }
+                                                      },
+                                                      "group": {
+                                                        "kind": "Group::Brace",
+                                                        "loc": null,
+                                                        "children": {}
                                                       }
                                                     }
-                                                  }
-                                                ]
-                                              },
-                                              "catch_all": false,
-                                              "try_else": {
-                                                "kind": "Expr::Try::CaseList",
-                                                "loc": null,
-                                                "children": [
-                                                  {
-                                                    "kind": "Case",
+                                                  },
+                                                  "catch": {
+                                                    "kind": "Expr::Try::CaseList",
                                                     "loc": null,
-                                                    "children": {
-                                                      "pattern": {
-                                                        "kind": "Pattern::Any",
-                                                        "loc": null,
-                                                        "children": {}
-                                                      },
-                                                      "guard": null,
-                                                      "body": {
-                                                        "kind": "Expr::Apply",
+                                                    "children": [
+                                                      {
+                                                        "kind": "Case",
                                                         "loc": null,
                                                         "children": {
-                                                          "func": {
-                                                            "kind": "Expr::Ident",
+                                                          "pattern": {
+                                                            "kind": "Pattern::Var",
                                                             "loc": null,
                                                             "children": {
-                                                              "id": {
-                                                                "kind": "Var",
+                                                              "value": {
+                                                                "kind": "Binder",
                                                                 "loc": null,
                                                                 "children": {
-                                                                  "name": {
-                                                                    "kind": "LongIdent::Ident",
+                                                                  "name": "err"
+                                                                }
+                                                              }
+                                                            }
+                                                          },
+                                                          "guard": null,
+                                                          "body": {
+                                                            "kind": "Expr::Apply",
+                                                            "loc": null,
+                                                            "children": {
+                                                              "func": {
+                                                                "kind": "Expr::Ident",
+                                                                "loc": null,
+                                                                "children": {
+                                                                  "id": {
+                                                                    "kind": "Var",
                                                                     "loc": null,
                                                                     "children": {
-                                                                      "value": "println"
+                                                                      "name": {
+                                                                        "kind": "LongIdent::Ident",
+                                                                        "loc": null,
+                                                                        "children": {
+                                                                          "value": "println"
+                                                                        }
+                                                                      }
                                                                     }
                                                                   }
                                                                 }
+                                                              },
+                                                              "args": {
+                                                                "kind": "Expr::Apply::ArgumentList",
+                                                                "loc": null,
+                                                                "children": [
+                                                                  {
+                                                                    "kind": "Argument",
+                                                                    "loc": null,
+                                                                    "children": {
+                                                                      "value": {
+                                                                        "kind": "Expr::Ident",
+                                                                        "loc": null,
+                                                                        "children": {
+                                                                          "id": {
+                                                                            "kind": "Var",
+                                                                            "loc": null,
+                                                                            "children": {
+                                                                              "name": {
+                                                                                "kind": "LongIdent::Ident",
+                                                                                "loc": null,
+                                                                                "children": {
+                                                                                  "value": "err"
+                                                                                }
+                                                                              }
+                                                                            }
+                                                                          }
+                                                                        }
+                                                                      },
+                                                                      "kind": {
+                                                                        "kind": "ArgumentKind::Positional",
+                                                                        "loc": null,
+                                                                        "children": {}
+                                                                      }
+                                                                    }
+                                                                  }
+                                                                ]
+                                                              },
+                                                              "attr": {
+                                                                "kind": "ApplyAttr::NoAttr",
+                                                                "loc": null,
+                                                                "children": {}
                                                               }
                                                             }
+                                                          }
+                                                        }
+                                                      }
+                                                    ]
+                                                  },
+                                                  "catch_all": false,
+                                                  "try_else": {
+                                                    "kind": "Expr::Try::CaseList",
+                                                    "loc": null,
+                                                    "children": [
+                                                      {
+                                                        "kind": "Case",
+                                                        "loc": null,
+                                                        "children": {
+                                                          "pattern": {
+                                                            "kind": "Pattern::Any",
+                                                            "loc": null,
+                                                            "children": {}
                                                           },
-                                                          "args": {
-                                                            "kind": "Expr::Apply::ArgumentList",
+                                                          "guard": null,
+                                                          "body": {
+                                                            "kind": "Expr::Apply",
                                                             "loc": null,
-                                                            "children": [
-                                                              {
-                                                                "kind": "Argument",
+                                                            "children": {
+                                                              "func": {
+                                                                "kind": "Expr::Ident",
                                                                 "loc": null,
                                                                 "children": {
-                                                                  "value": {
-                                                                    "kind": "Expr::Constant",
+                                                                  "id": {
+                                                                    "kind": "Var",
                                                                     "loc": null,
                                                                     "children": {
-                                                                      "constant": {
-                                                                        "kind": "Constant::String",
+                                                                      "name": {
+                                                                        "kind": "LongIdent::Ident",
                                                                         "loc": null,
                                                                         "children": {
-                                                                          "value": "is balanced"
+                                                                          "value": "println"
                                                                         }
                                                                       }
                                                                     }
-                                                                  },
-                                                                  "kind": {
-                                                                    "kind": "ArgumentKind::Positional",
-                                                                    "loc": null,
-                                                                    "children": {}
                                                                   }
                                                                 }
+                                                              },
+                                                              "args": {
+                                                                "kind": "Expr::Apply::ArgumentList",
+                                                                "loc": null,
+                                                                "children": [
+                                                                  {
+                                                                    "kind": "Argument",
+                                                                    "loc": null,
+                                                                    "children": {
+                                                                      "value": {
+                                                                        "kind": "Expr::Constant",
+                                                                        "loc": null,
+                                                                        "children": {
+                                                                          "constant": {
+                                                                            "kind": "Constant::String",
+                                                                            "loc": null,
+                                                                            "children": {
+                                                                              "value": "is balanced"
+                                                                            }
+                                                                          }
+                                                                        }
+                                                                      },
+                                                                      "kind": {
+                                                                        "kind": "ArgumentKind::Positional",
+                                                                        "loc": null,
+                                                                        "children": {}
+                                                                      }
+                                                                    }
+                                                                  }
+                                                                ]
+                                                              },
+                                                              "attr": {
+                                                                "kind": "ApplyAttr::NoAttr",
+                                                                "loc": null,
+                                                                "children": {}
                                                               }
-                                                            ]
-                                                          },
-                                                          "attr": {
-                                                            "kind": "ApplyAttr::NoAttr",
-                                                            "loc": null,
-                                                            "children": {}
+                                                            }
                                                           }
                                                         }
                                                       }
-                                                    }
-                                                  }
-                                                ]
+                                                    ]
+                                                  },
+                                                  "has_try": true
+                                                }
                                               },
-                                              "has_try": true
+                                              "group": {
+                                                "kind": "Group::Brace",
+                                                "loc": null,
+                                                "children": {}
+                                              }
                                             }
                                           },
                                           "return_type": null,
@@ -6869,7 +6891,7 @@
                                             "children": {}
                                           },
                                           "kind": {
-                                            "kind": "FnKind::Lambda",
+                                            "kind": "FnKind::Arrow",
                                             "loc": null,
                                             "children": {}
                                           },
diff --git a/test/sync_test/__snapshot__/pipeline_test_async_trait.mbt b/test/sync_test/__snapshot__/pipeline_test_async_trait.mbt
index 470f4f9a..7035c69d 100644
--- a/test/sync_test/__snapshot__/pipeline_test_async_trait.mbt
+++ b/test/sync_test/__snapshot__/pipeline_test_async_trait.mbt
@@ -68,12 +68,12 @@ async fn[S : Stream] is_balanced_poly(s : S) -> Unit raise Err {
 
 fn run_poly(input_sequence : Array[String]) -> Unit {
   let input = Input::new()
-  run_async(fn () {
+  run_async(() => {
     try {
       is_balanced_poly(input)
     } catch {
       err => println(err)
-    } else {
+    } noraise {
       _ => println("is balanced")
     }
   })
@@ -85,7 +85,7 @@ fn run_poly(input_sequence : Array[String]) -> Unit {
     input.terminate()
   } catch {
     err => println("sender received error: \{err}")
-  } else {
+  } noraise {
     _ => println("input closed succesfully")
   }
 }
@@ -113,12 +113,12 @@ async fn is_balanced_obj(s : &Stream) -> Unit raise Err {
 
 fn run_obj(input_sequence : Array[String]) -> Unit {
   let input = Input::new()
-  run_async(fn () {
+  run_async(() => {
     try {
       is_balanced_obj(input)
     } catch {
       err => println(err)
-    } else {
+    } noraise {
       _ => println("is balanced")
     }
   })
@@ -130,7 +130,7 @@ fn run_obj(input_sequence : Array[String]) -> Unit {
     input.terminate()
   } catch {
     err => println("sender received error: \{err}")
-  } else {
+  } noraise {
     _ => println("input closed succesfully")
   }
 }
diff --git a/test/sync_test/__snapshot__/pipeline_test_async_trait.mbt.tokens.json b/test/sync_test/__snapshot__/pipeline_test_async_trait.mbt.tokens.json
index b67e82e0..c183847d 100644
--- a/test/sync_test/__snapshot__/pipeline_test_async_trait.mbt.tokens.json
+++ b/test/sync_test/__snapshot__/pipeline_test_async_trait.mbt.tokens.json
@@ -2359,17 +2359,17 @@
     "token": "LPAREN",
     "loc": "71:12-71:13"
   },
-  {
-    "token": "FN",
-    "loc": "71:13-71:15"
-  },
   {
     "token": "LPAREN",
-    "loc": "71:16-71:17"
+    "loc": "71:13-71:14"
   },
   {
     "token": "RPAREN",
-    "loc": "71:17-71:18"
+    "loc": "71:14-71:15"
+  },
+  {
+    "token": "FAT_ARROW",
+    "loc": "71:16-71:18"
   },
   {
     "token": "LBRACE",
@@ -2475,16 +2475,16 @@
     "loc": "76:5-76:6"
   },
   {
-    "token": "ELSE",
-    "loc": "76:7-76:11"
+    "token": "NORAISE",
+    "loc": "76:7-76:14"
   },
   {
     "token": "LBRACE",
-    "loc": "76:12-76:13"
+    "loc": "76:15-76:16"
   },
   {
     "token": "NEWLINE",
-    "loc": "76:13-76:14"
+    "loc": "76:16-76:17"
   },
   {
     "token": "UNDERSCORE",
@@ -2754,16 +2754,16 @@
     "loc": "88:3-88:4"
   },
   {
-    "token": "ELSE",
-    "loc": "88:5-88:9"
+    "token": "NORAISE",
+    "loc": "88:5-88:12"
   },
   {
     "token": "LBRACE",
-    "loc": "88:10-88:11"
+    "loc": "88:13-88:14"
   },
   {
     "token": "NEWLINE",
-    "loc": "88:11-88:12"
+    "loc": "88:14-88:15"
   },
   {
     "token": "UNDERSCORE",
@@ -3919,17 +3919,17 @@
     "token": "LPAREN",
     "loc": "116:12-116:13"
   },
-  {
-    "token": "FN",
-    "loc": "116:13-116:15"
-  },
   {
     "token": "LPAREN",
-    "loc": "116:16-116:17"
+    "loc": "116:13-116:14"
   },
   {
     "token": "RPAREN",
-    "loc": "116:17-116:18"
+    "loc": "116:14-116:15"
+  },
+  {
+    "token": "FAT_ARROW",
+    "loc": "116:16-116:18"
   },
   {
     "token": "LBRACE",
@@ -4035,16 +4035,16 @@
     "loc": "121:5-121:6"
   },
   {
-    "token": "ELSE",
-    "loc": "121:7-121:11"
+    "token": "NORAISE",
+    "loc": "121:7-121:14"
   },
   {
     "token": "LBRACE",
-    "loc": "121:12-121:13"
+    "loc": "121:15-121:16"
   },
   {
     "token": "NEWLINE",
-    "loc": "121:13-121:14"
+    "loc": "121:16-121:17"
   },
   {
     "token": "UNDERSCORE",
@@ -4314,16 +4314,16 @@
     "loc": "133:3-133:4"
   },
   {
-    "token": "ELSE",
-    "loc": "133:5-133:9"
+    "token": "NORAISE",
+    "loc": "133:5-133:12"
   },
   {
     "token": "LBRACE",
-    "loc": "133:10-133:11"
+    "loc": "133:13-133:14"
   },
   {
     "token": "NEWLINE",
-    "loc": "133:11-133:12"
+    "loc": "133:14-133:15"
   },
   {
     "token": "UNDERSCORE",
diff --git a/test/sync_test/__snapshot__/pipeline_test_async_trait2.json b/test/sync_test/__snapshot__/pipeline_test_async_trait2.json
index 25c8147d..30f68bbf 100644
--- a/test/sync_test/__snapshot__/pipeline_test_async_trait2.json
+++ b/test/sync_test/__snapshot__/pipeline_test_async_trait2.json
@@ -878,95 +878,106 @@
                                 "children": []
                               },
                               "body": {
-                                "kind": "Expr::Pipe",
+                                "kind": "Expr::Group",
                                 "loc": null,
                                 "children": {
-                                  "lhs": {
-                                    "kind": "Expr::Apply",
+                                  "expr": {
+                                    "kind": "Expr::Pipe",
                                     "loc": null,
                                     "children": {
-                                      "func": {
-                                        "kind": "Expr::Method",
+                                      "lhs": {
+                                        "kind": "Expr::Apply",
                                         "loc": null,
                                         "children": {
-                                          "type_name": {
-                                            "kind": "TypeName",
+                                          "func": {
+                                            "kind": "Expr::Method",
                                             "loc": null,
                                             "children": {
-                                              "name": {
-                                                "kind": "LongIdent::Ident",
+                                              "type_name": {
+                                                "kind": "TypeName",
                                                 "loc": null,
                                                 "children": {
-                                                  "value": "I"
+                                                  "name": {
+                                                    "kind": "LongIdent::Ident",
+                                                    "loc": null,
+                                                    "children": {
+                                                      "value": "I"
+                                                    }
+                                                  },
+                                                  "is_object": false
                                                 }
                                               },
-                                              "is_object": false
+                                              "method_name": {
+                                                "kind": "Label",
+                                                "loc": null,
+                                                "children": {
+                                                  "name": "f"
+                                                }
+                                              }
                                             }
                                           },
-                                          "method_name": {
-                                            "kind": "Label",
+                                          "args": {
+                                            "kind": "Expr::Apply::ArgumentList",
                                             "loc": null,
-                                            "children": {
-                                              "name": "f"
-                                            }
-                                          }
-                                        }
-                                      },
-                                      "args": {
-                                        "kind": "Expr::Apply::ArgumentList",
-                                        "loc": null,
-                                        "children": [
-                                          {
-                                            "kind": "Argument",
-                                            "loc": null,
-                                            "children": {
-                                              "value": {
-                                                "kind": "Expr::Constant",
+                                            "children": [
+                                              {
+                                                "kind": "Argument",
                                                 "loc": null,
                                                 "children": {
-                                                  "constant": {
-                                                    "kind": "Constant::Int",
+                                                  "value": {
+                                                    "kind": "Expr::Constant",
                                                     "loc": null,
                                                     "children": {
-                                                      "value": "42"
+                                                      "constant": {
+                                                        "kind": "Constant::Int",
+                                                        "loc": null,
+                                                        "children": {
+                                                          "value": "42"
+                                                        }
+                                                      }
                                                     }
+                                                  },
+                                                  "kind": {
+                                                    "kind": "ArgumentKind::Positional",
+                                                    "loc": null,
+                                                    "children": {}
                                                   }
                                                 }
-                                              },
-                                              "kind": {
-                                                "kind": "ArgumentKind::Positional",
-                                                "loc": null,
-                                                "children": {}
                                               }
-                                            }
+                                            ]
+                                          },
+                                          "attr": {
+                                            "kind": "ApplyAttr::NoAttr",
+                                            "loc": null,
+                                            "children": {}
                                           }
-                                        ]
+                                        }
                                       },
-                                      "attr": {
-                                        "kind": "ApplyAttr::NoAttr",
-                                        "loc": null,
-                                        "children": {}
-                                      }
-                                    }
-                                  },
-                                  "rhs": {
-                                    "kind": "Expr::Ident",
-                                    "loc": null,
-                                    "children": {
-                                      "id": {
-                                        "kind": "Var",
+                                      "rhs": {
+                                        "kind": "Expr::Ident",
                                         "loc": null,
                                         "children": {
-                                          "name": {
-                                            "kind": "LongIdent::Ident",
+                                          "id": {
+                                            "kind": "Var",
                                             "loc": null,
                                             "children": {
-                                              "value": "println"
+                                              "name": {
+                                                "kind": "LongIdent::Ident",
+                                                "loc": null,
+                                                "children": {
+                                                  "value": "println"
+                                                }
+                                              }
                                             }
                                           }
                                         }
                                       }
                                     }
+                                  },
+                                  "group": {
+                                    "kind": "Group::Brace",
+                                    "loc": null,
+                                    "children": {}
                                   }
                                 }
                               },
@@ -977,7 +988,7 @@
                                 "children": {}
                               },
                               "kind": {
-                                "kind": "FnKind::Lambda",
+                                "kind": "FnKind::Arrow",
                                 "loc": null,
                                 "children": {}
                               },
diff --git a/test/sync_test/__snapshot__/pipeline_test_async_trait2.mbt b/test/sync_test/__snapshot__/pipeline_test_async_trait2.mbt
index 16ea8440..dca1ff54 100644
--- a/test/sync_test/__snapshot__/pipeline_test_async_trait2.mbt
+++ b/test/sync_test/__snapshot__/pipeline_test_async_trait2.mbt
@@ -10,7 +10,7 @@ impl I for Int with f(self) {
 }
 
 fn main {
-  run_async(fn () {
+  run_async(() => {
     I::f(42) |> println
   })
 }
diff --git a/test/sync_test/__snapshot__/pipeline_test_async_trait2.mbt.tokens.json b/test/sync_test/__snapshot__/pipeline_test_async_trait2.mbt.tokens.json
index 8d015390..34f584b9 100644
--- a/test/sync_test/__snapshot__/pipeline_test_async_trait2.mbt.tokens.json
+++ b/test/sync_test/__snapshot__/pipeline_test_async_trait2.mbt.tokens.json
@@ -464,17 +464,17 @@
     "token": "LPAREN",
     "loc": "13:12-13:13"
   },
-  {
-    "token": "FN",
-    "loc": "13:13-13:15"
-  },
   {
     "token": "LPAREN",
-    "loc": "13:16-13:17"
+    "loc": "13:13-13:14"
   },
   {
     "token": "RPAREN",
-    "loc": "13:17-13:18"
+    "loc": "13:14-13:15"
+  },
+  {
+    "token": "FAT_ARROW",
+    "loc": "13:16-13:18"
   },
   {
     "token": "LBRACE",
diff --git a/test/sync_test/__snapshot__/pipeline_test_cascade.json b/test/sync_test/__snapshot__/pipeline_test_cascade.json
index 32868bae..805ac84a 100644
--- a/test/sync_test/__snapshot__/pipeline_test_cascade.json
+++ b/test/sync_test/__snapshot__/pipeline_test_cascade.json
@@ -285,7 +285,7 @@
                               }
                             ]
                           },
-                          "return_self": true,
+                          "return_self": false,
                           "attr": {
                             "kind": "ApplyAttr::NoAttr",
                             "loc": null,
@@ -750,7 +750,7 @@
                                       }
                                     ]
                                   },
-                                  "return_self": true,
+                                  "return_self": false,
                                   "attr": {
                                     "kind": "ApplyAttr::NoAttr",
                                     "loc": null,
@@ -1370,7 +1370,7 @@
                                       }
                                     ]
                                   },
-                                  "return_self": true,
+                                  "return_self": false,
                                   "attr": {
                                     "kind": "ApplyAttr::NoAttr",
                                     "loc": null,
@@ -2319,7 +2319,7 @@
                                       }
                                     ]
                                   },
-                                  "return_self": true,
+                                  "return_self": false,
                                   "attr": {
                                     "kind": "ApplyAttr::NoAttr",
                                     "loc": null,
@@ -3538,14 +3538,19 @@
                 }
               },
               "body": {
-                "kind": "Expr::Sequence",
+                "kind": "Expr::Let",
                 "loc": null,
                 "children": {
-                  "exprs": {
-                    "kind": "Expr::Sequence::ExprList",
+                  "pattern": {
+                    "kind": "Pattern::Any",
                     "loc": null,
-                    "children": [
-                      {
+                    "children": {}
+                  },
+                  "expr": {
+                    "kind": "Expr::DotApply",
+                    "loc": null,
+                    "children": {
+                      "self": {
                         "kind": "Expr::DotApply",
                         "loc": null,
                         "children": {
@@ -3554,45 +3559,21 @@
                             "loc": null,
                             "children": {
                               "self": {
-                                "kind": "Expr::DotApply",
+                                "kind": "Expr::Ident",
                                 "loc": null,
                                 "children": {
-                                  "self": {
-                                    "kind": "Expr::Ident",
+                                  "id": {
+                                    "kind": "Var",
                                     "loc": null,
                                     "children": {
-                                      "id": {
-                                        "kind": "Var",
+                                      "name": {
+                                        "kind": "LongIdent::Ident",
                                         "loc": null,
                                         "children": {
-                                          "name": {
-                                            "kind": "LongIdent::Ident",
-                                            "loc": null,
-                                            "children": {
-                                              "value": "dq"
-                                            }
-                                          }
+                                          "value": "dq"
                                         }
                                       }
                                     }
-                                  },
-                                  "method_name": {
-                                    "kind": "Label",
-                                    "loc": null,
-                                    "children": {
-                                      "name": "pop_back"
-                                    }
-                                  },
-                                  "args": {
-                                    "kind": "Expr::DotApply::ArgList",
-                                    "loc": null,
-                                    "children": []
-                                  },
-                                  "return_self": true,
-                                  "attr": {
-                                    "kind": "ApplyAttr::NoAttr",
-                                    "loc": null,
-                                    "children": {}
                                   }
                                 }
                               },
@@ -3635,10 +3616,28 @@
                             "children": {}
                           }
                         }
+                      },
+                      "method_name": {
+                        "kind": "Label",
+                        "loc": null,
+                        "children": {
+                          "name": "pop_back"
+                        }
+                      },
+                      "args": {
+                        "kind": "Expr::DotApply::ArgList",
+                        "loc": null,
+                        "children": []
+                      },
+                      "return_self": false,
+                      "attr": {
+                        "kind": "ApplyAttr::NoAttr",
+                        "loc": null,
+                        "children": {}
                       }
-                    ]
+                    }
                   },
-                  "last_expr": {
+                  "body": {
                     "kind": "Expr::Apply",
                     "loc": null,
                     "children": {
diff --git a/test/sync_test/__snapshot__/pipeline_test_cascade.mbt b/test/sync_test/__snapshot__/pipeline_test_cascade.mbt
index ef88f95b..3c5fe521 100644
--- a/test/sync_test/__snapshot__/pipeline_test_cascade.mbt
+++ b/test/sync_test/__snapshot__/pipeline_test_cascade.mbt
@@ -2,7 +2,7 @@
 
 fn init {
   let v = [ 1, 2, 3 ]
-  v..push(4)..push(5)..push(6)
+  v..push(4)..push(5).push(6)
   println(v)
 }
 
@@ -14,7 +14,7 @@ fn init {
     ..write_string("a")
     ..expect(content="a")
     ..write_string("b")
-    ..expect(content="b")
+    .expect(content="b")
     println("ok")
   } catch {
     InspectError::InspectError(err) => println(err)
@@ -28,7 +28,7 @@ fn init {
     ..write_string("a")
     ..expect(content="b")
     ..write_string("b")
-    ..expect(content="b")
+    .expect(content="b")
     println("ok")
   } catch {
     _ => println("error")
@@ -47,7 +47,7 @@ fn init {
   let arr1 = []
   let arr2 = []
   let mut arr = arr1
-  arr..push({ arr = arr2; 1 })..push(2)
+  arr..push({ arr = arr2; 1 }).push(2)
   println((arr1, arr2))
 }
 
@@ -65,6 +65,6 @@ fn MyBuf::expect(self : MyBuf, content~ : String = "") -> Unit raise {
 // non-unit return type
 fn init {
   let dq = @deque.from_array([ Ref::new(1), Ref::new(2), Ref::new(3), Ref::new(4) ])
-  dq..pop_back()..pop_back()..pop_back()
+  let _ = dq..pop_back()..pop_back().pop_back()
   println(dq.pop_back())
 }
diff --git a/test/sync_test/__snapshot__/pipeline_test_cascade.mbt.tokens.json b/test/sync_test/__snapshot__/pipeline_test_cascade.mbt.tokens.json
index 48db0ed4..e7b57390 100644
--- a/test/sync_test/__snapshot__/pipeline_test_cascade.mbt.tokens.json
+++ b/test/sync_test/__snapshot__/pipeline_test_cascade.mbt.tokens.json
@@ -165,42 +165,38 @@
     "token": "RPAREN",
     "loc": "5:21-5:22"
   },
-  {
-    "token": "DOTDOT",
-    "loc": "5:22-5:24"
-  },
   {
     "token": [
-      "LIDENT",
+      "DOT_LIDENT",
       "push"
     ],
-    "loc": "5:24-5:28"
+    "loc": "5:23-5:27"
   },
   {
     "token": "LPAREN",
-    "loc": "5:28-5:29"
+    "loc": "5:27-5:28"
   },
   {
     "token": [
       "INT",
       "6"
     ],
-    "loc": "5:29-5:30"
+    "loc": "5:28-5:29"
   },
   {
     "token": "RPAREN",
-    "loc": "5:30-5:31"
+    "loc": "5:29-5:30"
   },
   {
     "token": [
       "SEMI",
       false
     ],
-    "loc": "5:31-5:31"
+    "loc": "5:30-5:30"
   },
   {
     "token": "NEWLINE",
-    "loc": "5:31-5:32"
+    "loc": "5:30-5:31"
   },
   {
     "token": [
@@ -474,53 +470,49 @@
     "token": "NEWLINE",
     "loc": "16:24-16:25"
   },
-  {
-    "token": "DOTDOT",
-    "loc": "17:5-17:7"
-  },
   {
     "token": [
-      "LIDENT",
+      "DOT_LIDENT",
       "expect"
     ],
-    "loc": "17:7-17:13"
+    "loc": "17:6-17:12"
   },
   {
     "token": "LPAREN",
-    "loc": "17:13-17:14"
+    "loc": "17:12-17:13"
   },
   {
     "token": [
       "LIDENT",
       "content"
     ],
-    "loc": "17:14-17:21"
+    "loc": "17:13-17:20"
   },
   {
     "token": "EQUAL",
-    "loc": "17:21-17:22"
+    "loc": "17:20-17:21"
   },
   {
     "token": [
       "STRING",
       "b"
     ],
-    "loc": "17:22-17:25"
+    "loc": "17:21-17:24"
   },
   {
     "token": "RPAREN",
-    "loc": "17:25-17:26"
+    "loc": "17:24-17:25"
   },
   {
     "token": [
       "SEMI",
       false
     ],
-    "loc": "17:26-17:26"
+    "loc": "17:25-17:25"
   },
   {
     "token": "NEWLINE",
-    "loc": "17:26-17:27"
+    "loc": "17:25-17:26"
   },
   {
     "token": [
@@ -860,53 +852,49 @@
     "token": "NEWLINE",
     "loc": "30:24-30:25"
   },
-  {
-    "token": "DOTDOT",
-    "loc": "31:5-31:7"
-  },
   {
     "token": [
-      "LIDENT",
+      "DOT_LIDENT",
       "expect"
     ],
-    "loc": "31:7-31:13"
+    "loc": "31:6-31:12"
   },
   {
     "token": "LPAREN",
-    "loc": "31:13-31:14"
+    "loc": "31:12-31:13"
   },
   {
     "token": [
       "LIDENT",
       "content"
     ],
-    "loc": "31:14-31:21"
+    "loc": "31:13-31:20"
   },
   {
     "token": "EQUAL",
-    "loc": "31:21-31:22"
+    "loc": "31:20-31:21"
   },
   {
     "token": [
       "STRING",
       "b"
     ],
-    "loc": "31:22-31:25"
+    "loc": "31:21-31:24"
   },
   {
     "token": "RPAREN",
-    "loc": "31:25-31:26"
+    "loc": "31:24-31:25"
   },
   {
     "token": [
       "SEMI",
       false
     ],
-    "loc": "31:26-31:26"
+    "loc": "31:25-31:25"
   },
   {
     "token": "NEWLINE",
-    "loc": "31:26-31:27"
+    "loc": "31:25-31:26"
   },
   {
     "token": [
@@ -1473,42 +1461,38 @@
     "token": "RPAREN",
     "loc": "50:30-50:31"
   },
-  {
-    "token": "DOTDOT",
-    "loc": "50:31-50:33"
-  },
   {
     "token": [
-      "LIDENT",
+      "DOT_LIDENT",
       "push"
     ],
-    "loc": "50:33-50:37"
+    "loc": "50:32-50:36"
   },
   {
     "token": "LPAREN",
-    "loc": "50:37-50:38"
+    "loc": "50:36-50:37"
   },
   {
     "token": [
       "INT",
       "2"
     ],
-    "loc": "50:38-50:39"
+    "loc": "50:37-50:38"
   },
   {
     "token": "RPAREN",
-    "loc": "50:39-50:40"
+    "loc": "50:38-50:39"
   },
   {
     "token": [
       "SEMI",
       false
     ],
-    "loc": "50:40-50:40"
+    "loc": "50:39-50:39"
   },
   {
     "token": "NEWLINE",
-    "loc": "50:40-50:41"
+    "loc": "50:39-50:40"
   },
   {
     "token": [
@@ -2210,80 +2194,88 @@
     "token": "NEWLINE",
     "loc": "67:85-67:86"
   },
+  {
+    "token": "LET",
+    "loc": "68:3-68:6"
+  },
+  {
+    "token": "UNDERSCORE",
+    "loc": "68:7-68:8"
+  },
+  {
+    "token": "EQUAL",
+    "loc": "68:9-68:10"
+  },
   {
     "token": [
       "LIDENT",
       "dq"
     ],
-    "loc": "68:3-68:5"
+    "loc": "68:11-68:13"
   },
   {
     "token": "DOTDOT",
-    "loc": "68:5-68:7"
+    "loc": "68:13-68:15"
   },
   {
     "token": [
       "LIDENT",
       "pop_back"
     ],
-    "loc": "68:7-68:15"
+    "loc": "68:15-68:23"
   },
   {
     "token": "LPAREN",
-    "loc": "68:15-68:16"
+    "loc": "68:23-68:24"
   },
   {
     "token": "RPAREN",
-    "loc": "68:16-68:17"
+    "loc": "68:24-68:25"
   },
   {
     "token": "DOTDOT",
-    "loc": "68:17-68:19"
+    "loc": "68:25-68:27"
   },
   {
     "token": [
       "LIDENT",
       "pop_back"
     ],
-    "loc": "68:19-68:27"
+    "loc": "68:27-68:35"
   },
   {
     "token": "LPAREN",
-    "loc": "68:27-68:28"
+    "loc": "68:35-68:36"
   },
   {
     "token": "RPAREN",
-    "loc": "68:28-68:29"
-  },
-  {
-    "token": "DOTDOT",
-    "loc": "68:29-68:31"
+    "loc": "68:36-68:37"
   },
   {
     "token": [
-      "LIDENT",
+      "DOT_LIDENT",
       "pop_back"
     ],
-    "loc": "68:31-68:39"
+    "loc": "68:38-68:46"
   },
   {
     "token": "LPAREN",
-    "loc": "68:39-68:40"
+    "loc": "68:46-68:47"
   },
   {
     "token": "RPAREN",
-    "loc": "68:40-68:41"
+    "loc": "68:47-68:48"
   },
   {
     "token": [
       "SEMI",
       false
     ],
-    "loc": "68:41-68:41"
+    "loc": "68:48-68:48"
   },
   {
     "token": "NEWLINE",
-    "loc": "68:41-68:42"
+    "loc": "68:48-68:49"
   },
   {
     "token": [
diff --git a/test/sync_test/__snapshot__/pipeline_test_chain_error_optional_test.json b/test/sync_test/__snapshot__/pipeline_test_chain_error_optional_test.json
index 5d412740..3545d2ce 100644
--- a/test/sync_test/__snapshot__/pipeline_test_chain_error_optional_test.json
+++ b/test/sync_test/__snapshot__/pipeline_test_chain_error_optional_test.json
@@ -592,7 +592,7 @@
                                         "children": {}
                                       },
                                       "kind": {
-                                        "kind": "FnKind::Lambda",
+                                        "kind": "FnKind::Arrow",
                                         "loc": null,
                                         "children": {}
                                       },
@@ -923,7 +923,7 @@
                                 "children": {}
                               },
                               "kind": {
-                                "kind": "FnKind::Lambda",
+                                "kind": "FnKind::Arrow",
                                 "loc": null,
                                 "children": {}
                               },
diff --git a/test/sync_test/__snapshot__/pipeline_test_chain_error_optional_test.mbt b/test/sync_test/__snapshot__/pipeline_test_chain_error_optional_test.mbt
index c81fc88b..295cb117 100644
--- a/test/sync_test/__snapshot__/pipeline_test_chain_error_optional_test.mbt
+++ b/test/sync_test/__snapshot__/pipeline_test_chain_error_optional_test.mbt
@@ -6,7 +6,7 @@ fn id(f : () -> Unit raise?) -> () -> Unit raise? {
 ///|
 fn main {
   id(fn() { println("hello") })()
-  let f = id(fn() { raise Failure::Failure("error") }) // can not infer
+  let f = id(() => raise Failure::Failure("error")) // can not infer
   // let f : () -> Unit raise Failure = id(fn ()  { raise Failure("error")})
   // let f = id(fn () -> Unit ! Error { raise Failure("error")})
   (try? f()) |> ignore
@@ -14,6 +14,6 @@ fn main {
 
 ///|
 test {
-  let f : () -> Unit raise Failure = id(fn() { raise Failure("error") })
+  let f : () -> Unit raise Failure = id(() => raise Failure("error"))
   (try? f()) |> ignore
 }
diff --git a/test/sync_test/__snapshot__/pipeline_test_chain_error_optional_test.mbt.tokens.json b/test/sync_test/__snapshot__/pipeline_test_chain_error_optional_test.mbt.tokens.json
index 95accf16..d30ead57 100644
--- a/test/sync_test/__snapshot__/pipeline_test_chain_error_optional_test.mbt.tokens.json
+++ b/test/sync_test/__snapshot__/pipeline_test_chain_error_optional_test.mbt.tokens.json
@@ -288,73 +288,65 @@
     "token": "LPAREN",
     "loc": "9:13-9:14"
   },
-  {
-    "token": "FN",
-    "loc": "9:14-9:16"
-  },
   {
     "token": "LPAREN",
-    "loc": "9:16-9:17"
+    "loc": "9:14-9:15"
   },
   {
     "token": "RPAREN",
-    "loc": "9:17-9:18"
+    "loc": "9:15-9:16"
   },
   {
-    "token": "LBRACE",
-    "loc": "9:19-9:20"
+    "token": "FAT_ARROW",
+    "loc": "9:17-9:19"
   },
   {
     "token": "RAISE",
-    "loc": "9:21-9:26"
+    "loc": "9:20-9:25"
   },
   {
     "token": [
       "UIDENT",
       "Failure"
     ],
-    "loc": "9:27-9:34"
+    "loc": "9:26-9:33"
   },
   {
     "token": "COLONCOLON",
-    "loc": "9:34-9:36"
+    "loc": "9:33-9:35"
   },
   {
     "token": [
       "UIDENT",
       "Failure"
     ],
-    "loc": "9:36-9:43"
+    "loc": "9:35-9:42"
   },
   {
     "token": "LPAREN",
-    "loc": "9:43-9:44"
+    "loc": "9:42-9:43"
   },
   {
     "token": [
       "STRING",
       "error"
     ],
-    "loc": "9:44-9:51"
+    "loc": "9:43-9:50"
   },
   {
     "token": "RPAREN",
-    "loc": "9:51-9:52"
-  },
-  {
-    "token": "RBRACE",
-    "loc": "9:53-9:54"
+    "loc": "9:50-9:51"
   },
   {
     "token": "RPAREN",
-    "loc": "9:54-9:55"
+    "loc": "9:51-9:52"
   },
   {
     "token": [
       "SEMI",
       false
     ],
-    "loc": "9:55-9:55"
+    "loc": "9:52-9:52"
   },
   {
     "token": [
@@ -365,11 +357,11 @@
         "consumed_by_docstring": false
       }
     ],
-    "loc": "9:56-9:72"
+    "loc": "9:53-9:69"
   },
   {
     "token": "NEWLINE",
-    "loc": "9:72-9:73"
+    "loc": "9:69-9:70"
   },
   {
     "token": [
@@ -567,66 +559,58 @@
     "token": "LPAREN",
     "loc": "17:40-17:41"
   },
-  {
-    "token": "FN",
-    "loc": "17:41-17:43"
-  },
   {
     "token": "LPAREN",
-    "loc": "17:43-17:44"
+    "loc": "17:41-17:42"
   },
   {
     "token": "RPAREN",
-    "loc": "17:44-17:45"
+    "loc": "17:42-17:43"
   },
   {
-    "token": "LBRACE",
-    "loc": "17:46-17:47"
+    "token": "FAT_ARROW",
+    "loc": "17:44-17:46"
   },
   {
     "token": "RAISE",
-    "loc": "17:48-17:53"
+    "loc": "17:47-17:52"
   },
   {
     "token": [
       "UIDENT",
       "Failure"
     ],
-    "loc": "17:54-17:61"
+    "loc": "17:53-17:60"
   },
   {
     "token": "LPAREN",
-    "loc": "17:61-17:62"
+    "loc": "17:60-17:61"
   },
   {
     "token": [
       "STRING",
       "error"
     ],
-    "loc": "17:62-17:69"
+    "loc": "17:61-17:68"
   },
   {
     "token": "RPAREN",
-    "loc": "17:69-17:70"
-  },
-  {
-    "token": "RBRACE",
-    "loc": "17:71-17:72"
+    "loc": "17:68-17:69"
   },
   {
     "token": "RPAREN",
-    "loc": "17:72-17:73"
+    "loc": "17:69-17:70"
   },
   {
     "token": [
       "SEMI",
       false
     ],
-    "loc": "17:73-17:73"
+    "loc": "17:70-17:70"
   },
   {
     "token": "NEWLINE",
-    "loc": "17:73-17:74"
+    "loc": "17:70-17:71"
   },
   {
     "token": "LPAREN",
diff --git a/test/sync_test/__snapshot__/pipeline_test_coroutine.json b/test/sync_test/__snapshot__/pipeline_test_coroutine.json
index f349b40b..97fbdad6 100644
--- a/test/sync_test/__snapshot__/pipeline_test_coroutine.json
+++ b/test/sync_test/__snapshot__/pipeline_test_coroutine.json
@@ -2466,7 +2466,7 @@
                                                             "children": {}
                                                           },
                                                           "kind": {
-                                                            "kind": "FnKind::Lambda",
+                                                            "kind": "FnKind::Arrow",
                                                             "loc": null,
                                                             "children": {}
                                                           },
@@ -2499,7 +2499,7 @@
                                         "children": {}
                                       },
                                       "kind": {
-                                        "kind": "FnKind::Lambda",
+                                        "kind": "FnKind::Arrow",
                                         "loc": null,
                                         "children": {}
                                       },
@@ -2993,7 +2993,7 @@
                                         "children": {}
                                       },
                                       "kind": {
-                                        "kind": "FnKind::Lambda",
+                                        "kind": "FnKind::Arrow",
                                         "loc": null,
                                         "children": {}
                                       },
@@ -3214,71 +3214,58 @@
                                             ]
                                           },
                                           "body": {
-                                            "kind": "Expr::Sequence",
+                                            "kind": "Expr::Group",
                                             "loc": null,
                                             "children": {
-                                              "exprs": {
-                                                "kind": "Expr::Sequence::ExprList",
+                                              "expr": {
+                                                "kind": "Expr::Sequence",
                                                 "loc": null,
-                                                "children": [
-                                                  {
-                                                    "kind": "Expr::For",
+                                                "children": {
+                                                  "exprs": {
+                                                    "kind": "Expr::Sequence::ExprList",
                                                     "loc": null,
-                                                    "children": {
-                                                      "binders": {
-                                                        "kind": "Expr::For::BindingList",
+                                                    "children": [
+                                                      {
+                                                        "kind": "Expr::For",
                                                         "loc": null,
-                                                        "children": [
-                                                          {
-                                                            "kind": "For::Binding",
+                                                        "children": {
+                                                          "binders": {
+                                                            "kind": "Expr::For::BindingList",
                                                             "loc": null,
-                                                            "children": {
-                                                              "binder": {
-                                                                "kind": "Binder",
-                                                                "loc": null,
-                                                                "children": {
-                                                                  "name": "i"
-                                                                }
-                                                              },
-                                                              "expr": {
-                                                                "kind": "Expr::Constant",
+                                                            "children": [
+                                                              {
+                                                                "kind": "For::Binding",
                                                                 "loc": null,
                                                                 "children": {
-                                                                  "constant": {
-                                                                    "kind": "Constant::Int",
+                                                                  "binder": {
+                                                                    "kind": "Binder",
+                                                                    "loc": null,
+                                                                    "children": {
+                                                                      "name": "i"
+                                                                    }
+                                                                  },
+                                                                  "expr": {
+                                                                    "kind": "Expr::Constant",
                                                                     "loc": null,
                                                                     "children": {
-                                                                      "value": "0"
+                                                                      "constant": {
+                                                                        "kind": "Constant::Int",
+                                                                        "loc": null,
+                                                                        "children": {
+                                                                          "value": "0"
+                                                                        }
+                                                                      }
                                                                     }
                                                                   }
                                                                 }
                                                               }
-                                                            }
-                                                          }
-                                                        ]
-                                                      },
-                                                      "condition": {
-                                                        "kind": "Expr::Infix",
-                                                        "loc": null,
-                                                        "children": {
-                                                          "op": {
-                                                            "kind": "Var",
-                                                            "loc": null,
-                                                            "children": {
-                                                              "name": {
-                                                                "kind": "LongIdent::Ident",
-                                                                "loc": null,
-                                                                "children": {
-                                                                  "value": "<"
-                                                                }
-                                                              }
-                                                            }
+                                                            ]
                                                           },
-                                                          "lhs": {
-                                                            "kind": "Expr::Ident",
+                                                          "condition": {
+                                                            "kind": "Expr::Infix",
                                                             "loc": null,
                                                             "children": {
-                                                              "id": {
+                                                              "op": {
                                                                 "kind": "Var",
                                                                 "loc": null,
                                                                 "children": {
@@ -3286,48 +3273,16 @@
                                                                     "kind": "LongIdent::Ident",
                                                                     "loc": null,
                                                                     "children": {
-                                                                      "value": "i"
+                                                                      "value": "<"
                                                                     }
                                                                   }
                                                                 }
-                                                              }
-                                                            }
-                                                          },
-                                                          "rhs": {
-                                                            "kind": "Expr::Constant",
-                                                            "loc": null,
-                                                            "children": {
-                                                              "constant": {
-                                                                "kind": "Constant::Int",
-                                                                "loc": null,
-                                                                "children": {
-                                                                  "value": "10"
-                                                                }
-                                                              }
-                                                            }
-                                                          }
-                                                        }
-                                                      },
-                                                      "continue_block": {
-                                                        "kind": "Expr::For::ContBindingList",
-                                                        "loc": null,
-                                                        "children": [
-                                                          {
-                                                            "kind": "For::ContBinding",
-                                                            "loc": null,
-                                                            "children": {
-                                                              "binder": {
-                                                                "kind": "Binder",
-                                                                "loc": null,
-                                                                "children": {
-                                                                  "name": "i"
-                                                                }
                                                               },
-                                                              "expr": {
-                                                                "kind": "Expr::Infix",
+                                                              "lhs": {
+                                                                "kind": "Expr::Ident",
                                                                 "loc": null,
                                                                 "children": {
-                                                                  "op": {
+                                                                  "id": {
                                                                     "kind": "Var",
                                                                     "loc": null,
                                                                     "children": {
@@ -3335,66 +3290,48 @@
                                                                         "kind": "LongIdent::Ident",
                                                                         "loc": null,
                                                                         "children": {
-                                                                          "value": "+"
-                                                                        }
-                                                                      }
-                                                                    }
-                                                                  },
-                                                                  "lhs": {
-                                                                    "kind": "Expr::Ident",
-                                                                    "loc": null,
-                                                                    "children": {
-                                                                      "id": {
-                                                                        "kind": "Var",
-                                                                        "loc": null,
-                                                                        "children": {
-                                                                          "name": {
-                                                                            "kind": "LongIdent::Ident",
-                                                                            "loc": null,
-                                                                            "children": {
-                                                                              "value": "i"
-                                                                            }
-                                                                          }
+                                                                          "value": "i"
                                                                         }
                                                                       }
                                                                     }
-                                                                  },
-                                                                  "rhs": {
-                                                                    "kind": "Expr::Constant",
+                                                                  }
+                                                                }
+                                                              },
+                                                              "rhs": {
+                                                                "kind": "Expr::Constant",
+                                                                "loc": null,
+                                                                "children": {
+                                                                  "constant": {
+                                                                    "kind": "Constant::Int",
                                                                     "loc": null,
                                                                     "children": {
-                                                                      "constant": {
-                                                                        "kind": "Constant::Int",
-                                                                        "loc": null,
-                                                                        "children": {
-                                                                          "value": "1"
-                                                                        }
-                                                                      }
+                                                                      "value": "10"
                                                                     }
                                                                   }
                                                                 }
                                                               }
                                                             }
-                                                          }
-                                                        ]
-                                                      },
-                                                      "body": {
-                                                        "kind": "Expr::Sequence",
-                                                        "loc": null,
-                                                        "children": {
-                                                          "exprs": {
-                                                            "kind": "Expr::Sequence::ExprList",
+                                                          },
+                                                          "continue_block": {
+                                                            "kind": "Expr::For::ContBindingList",
                                                             "loc": null,
                                                             "children": [
                                                               {
-                                                                "kind": "Expr::Apply",
+                                                                "kind": "For::ContBinding",
                                                                 "loc": null,
                                                                 "children": {
-                                                                  "func": {
-                                                                    "kind": "Expr::Ident",
+                                                                  "binder": {
+                                                                    "kind": "Binder",
                                                                     "loc": null,
                                                                     "children": {
-                                                                      "id": {
+                                                                      "name": "i"
+                                                                    }
+                                                                  },
+                                                                  "expr": {
+                                                                    "kind": "Expr::Infix",
+                                                                    "loc": null,
+                                                                    "children": {
+                                                                      "op": {
                                                                         "kind": "Var",
                                                                         "loc": null,
                                                                         "children": {
@@ -3402,210 +3339,284 @@
                                                                             "kind": "LongIdent::Ident",
                                                                             "loc": null,
                                                                             "children": {
-                                                                              "value": "println"
+                                                                              "value": "+"
                                                                             }
                                                                           }
                                                                         }
-                                                                      }
-                                                                    }
-                                                                  },
-                                                                  "args": {
-                                                                    "kind": "Expr::Apply::ArgumentList",
-                                                                    "loc": null,
-                                                                    "children": [
-                                                                      {
-                                                                        "kind": "Argument",
+                                                                      },
+                                                                      "lhs": {
+                                                                        "kind": "Expr::Ident",
                                                                         "loc": null,
                                                                         "children": {
-                                                                          "value": {
-                                                                            "kind": "Expr::Interp",
+                                                                          "id": {
+                                                                            "kind": "Var",
                                                                             "loc": null,
                                                                             "children": {
-                                                                              "elems": {
-                                                                                "kind": "Expr::Interp::ElemList",
+                                                                              "name": {
+                                                                                "kind": "LongIdent::Ident",
                                                                                 "loc": null,
-                                                                                "children": [
-                                                                                  {
-                                                                                    "kind": "InterpElem::Literal",
-                                                                                    "loc": null,
-                                                                                    "children": {
-                                                                                      "repr": "thread "
-                                                                                    }
-                                                                                  },
-                                                                                  {
-                                                                                    "kind": "InterpElem::Source",
-                                                                                    "loc": null,
-                                                                                    "children": {
-                                                                                      "source": "id"
-                                                                                    }
-                                                                                  },
-                                                                                  {
-                                                                                    "kind": "InterpElem::Literal",
-                                                                                    "loc": null,
-                                                                                    "children": {
-                                                                                      "repr": ": "
-                                                                                    }
-                                                                                  },
-                                                                                  {
-                                                                                    "kind": "InterpElem::Source",
-                                                                                    "loc": null,
-                                                                                    "children": {
-                                                                                      "source": "i"
-                                                                                    }
-                                                                                  }
-                                                                                ]
+                                                                                "children": {
+                                                                                  "value": "i"
+                                                                                }
                                                                               }
                                                                             }
-                                                                          },
-                                                                          "kind": {
-                                                                            "kind": "ArgumentKind::Positional",
+                                                                          }
+                                                                        }
+                                                                      },
+                                                                      "rhs": {
+                                                                        "kind": "Expr::Constant",
+                                                                        "loc": null,
+                                                                        "children": {
+                                                                          "constant": {
+                                                                            "kind": "Constant::Int",
                                                                             "loc": null,
-                                                                            "children": {}
+                                                                            "children": {
+                                                                              "value": "1"
+                                                                            }
                                                                           }
                                                                         }
                                                                       }
-                                                                    ]
-                                                                  },
-                                                                  "attr": {
-                                                                    "kind": "ApplyAttr::NoAttr",
-                                                                    "loc": null,
-                                                                    "children": {}
+                                                                    }
                                                                   }
                                                                 }
                                                               }
                                                             ]
                                                           },
-                                                          "last_expr": {
-                                                            "kind": "Expr::DotApply",
+                                                          "body": {
+                                                            "kind": "Expr::Sequence",
                                                             "loc": null,
                                                             "children": {
-                                                              "self": {
-                                                                "kind": "Expr::Ident",
+                                                              "exprs": {
+                                                                "kind": "Expr::Sequence::ExprList",
                                                                 "loc": null,
-                                                                "children": {
-                                                                  "id": {
-                                                                    "kind": "Var",
+                                                                "children": [
+                                                                  {
+                                                                    "kind": "Expr::Apply",
                                                                     "loc": null,
                                                                     "children": {
-                                                                      "name": {
-                                                                        "kind": "LongIdent::Ident",
+                                                                      "func": {
+                                                                        "kind": "Expr::Ident",
                                                                         "loc": null,
                                                                         "children": {
-                                                                          "value": "ctx"
+                                                                          "id": {
+                                                                            "kind": "Var",
+                                                                            "loc": null,
+                                                                            "children": {
+                                                                              "name": {
+                                                                                "kind": "LongIdent::Ident",
+                                                                                "loc": null,
+                                                                                "children": {
+                                                                                  "value": "println"
+                                                                                }
+                                                                              }
+                                                                            }
+                                                                          }
                                                                         }
+                                                                      },
+                                                                      "args": {
+                                                                        "kind": "Expr::Apply::ArgumentList",
+                                                                        "loc": null,
+                                                                        "children": [
+                                                                          {
+                                                                            "kind": "Argument",
+                                                                            "loc": null,
+                                                                            "children": {
+                                                                              "value": {
+                                                                                "kind": "Expr::Interp",
+                                                                                "loc": null,
+                                                                                "children": {
+                                                                                  "elems": {
+                                                                                    "kind": "Expr::Interp::ElemList",
+                                                                                    "loc": null,
+                                                                                    "children": [
+                                                                                      {
+                                                                                        "kind": "InterpElem::Literal",
+                                                                                        "loc": null,
+                                                                                        "children": {
+                                                                                          "repr": "thread "
+                                                                                        }
+                                                                                      },
+                                                                                      {
+                                                                                        "kind": "InterpElem::Source",
+                                                                                        "loc": null,
+                                                                                        "children": {
+                                                                                          "source": "id"
+                                                                                        }
+                                                                                      },
+                                                                                      {
+                                                                                        "kind": "InterpElem::Literal",
+                                                                                        "loc": null,
+                                                                                        "children": {
+                                                                                          "repr": ": "
+                                                                                        }
+                                                                                      },
+                                                                                      {
+                                                                                        "kind": "InterpElem::Source",
+                                                                                        "loc": null,
+                                                                                        "children": {
+                                                                                          "source": "i"
+                                                                                        }
+                                                                                      }
+                                                                                    ]
+                                                                                  }
+                                                                                }
+                                                                              },
+                                                                              "kind": {
+                                                                                "kind": "ArgumentKind::Positional",
+                                                                                "loc": null,
+                                                                                "children": {}
+                                                                              }
+                                                                            }
+                                                                          }
+                                                                        ]
+                                                                      },
+                                                                      "attr": {
+                                                                        "kind": "ApplyAttr::NoAttr",
+                                                                        "loc": null,
+                                                                        "children": {}
                                                                       }
                                                                     }
                                                                   }
-                                                                }
+                                                                ]
                                                               },
-                                                              "method_name": {
-                                                                "kind": "Label",
+                                                              "last_expr": {
+                                                                "kind": "Expr::DotApply",
                                                                 "loc": null,
                                                                 "children": {
-                                                                  "name": "suspend"
-                                                                }
-                                                              },
-                                                              "args": {
-                                                                "kind": "Expr::DotApply::ArgList",
-                                                                "loc": null,
-                                                                "children": []
-                                                              },
-                                                              "return_self": false,
-                                                              "attr": {
-                                                                "kind": "ApplyAttr::NoAttr",
-                                                                "loc": null,
-                                                                "children": {}
+                                                                  "self": {
+                                                                    "kind": "Expr::Ident",
+                                                                    "loc": null,
+                                                                    "children": {
+                                                                      "id": {
+                                                                        "kind": "Var",
+                                                                        "loc": null,
+                                                                        "children": {
+                                                                          "name": {
+                                                                            "kind": "LongIdent::Ident",
+                                                                            "loc": null,
+                                                                            "children": {
+                                                                              "value": "ctx"
+                                                                            }
+                                                                          }
+                                                                        }
+                                                                      }
+                                                                    }
+                                                                  },
+                                                                  "method_name": {
+                                                                    "kind": "Label",
+                                                                    "loc": null,
+                                                                    "children": {
+                                                                      "name": "suspend"
+                                                                    }
+                                                                  },
+                                                                  "args": {
+                                                                    "kind": "Expr::DotApply::ArgList",
+                                                                    "loc": null,
+                                                                    "children": []
+                                                                  },
+                                                                  "return_self": false,
+                                                                  "attr": {
+                                                                    "kind": "ApplyAttr::NoAttr",
+                                                                    "loc": null,
+                                                                    "children": {}
+                                                                  }
+                                                                }
                                                               }
                                                             }
-                                                          }
+                                                          },
+                                                          "for_else": null,
+                                                          "where_clause": null,
+                                                          "label": null
                                                         }
-                                                      },
-                                                      "for_else": null,
-                                                      "where_clause": null,
-                                                      "label": null
-                                                    }
-                                                  }
-                                                ]
-                                              },
-                                              "last_expr": {
-                                                "kind": "Expr::Apply",
-                                                "loc": null,
-                                                "children": {
-                                                  "func": {
-                                                    "kind": "Expr::Ident",
+                                                      }
+                                                    ]
+                                                  },
+                                                  "last_expr": {
+                                                    "kind": "Expr::Apply",
                                                     "loc": null,
                                                     "children": {
-                                                      "id": {
-                                                        "kind": "Var",
+                                                      "func": {
+                                                        "kind": "Expr::Ident",
                                                         "loc": null,
                                                         "children": {
-                                                          "name": {
-                                                            "kind": "LongIdent::Ident",
+                                                          "id": {
+                                                            "kind": "Var",
                                                             "loc": null,
                                                             "children": {
-                                                              "value": "println"
+                                                              "name": {
+                                                                "kind": "LongIdent::Ident",
+                                                                "loc": null,
+                                                                "children": {
+                                                                  "value": "println"
+                                                                }
+                                                              }
                                                             }
                                                           }
                                                         }
-                                                      }
-                                                    }
-                                                  },
-                                                  "args": {
-                                                    "kind": "Expr::Apply::ArgumentList",
-                                                    "loc": null,
-                                                    "children": [
-                                                      {
-                                                        "kind": "Argument",
+                                                      },
+                                                      "args": {
+                                                        "kind": "Expr::Apply::ArgumentList",
                                                         "loc": null,
-                                                        "children": {
-                                                          "value": {
-                                                            "kind": "Expr::Interp",
+                                                        "children": [
+                                                          {
+                                                            "kind": "Argument",
                                                             "loc": null,
                                                             "children": {
-                                                              "elems": {
-                                                                "kind": "Expr::Interp::ElemList",
+                                                              "value": {
+                                                                "kind": "Expr::Interp",
                                                                 "loc": null,
-                                                                "children": [
-                                                                  {
-                                                                    "kind": "InterpElem::Literal",
-                                                                    "loc": null,
-                                                                    "children": {
-                                                                      "repr": "thread "
-                                                                    }
-                                                                  },
-                                                                  {
-                                                                    "kind": "InterpElem::Source",
-                                                                    "loc": null,
-                                                                    "children": {
-                                                                      "source": "id"
-                                                                    }
-                                                                  },
-                                                                  {
-                                                                    "kind": "InterpElem::Literal",
+                                                                "children": {
+                                                                  "elems": {
+                                                                    "kind": "Expr::Interp::ElemList",
                                                                     "loc": null,
-                                                                    "children": {
-                                                                      "repr": ": done"
-                                                                    }
+                                                                    "children": [
+                                                                      {
+                                                                        "kind": "InterpElem::Literal",
+                                                                        "loc": null,
+                                                                        "children": {
+                                                                          "repr": "thread "
+                                                                        }
+                                                                      },
+                                                                      {
+                                                                        "kind": "InterpElem::Source",
+                                                                        "loc": null,
+                                                                        "children": {
+                                                                          "source": "id"
+                                                                        }
+                                                                      },
+                                                                      {
+                                                                        "kind": "InterpElem::Literal",
+                                                                        "loc": null,
+                                                                        "children": {
+                                                                          "repr": ": done"
+                                                                        }
+                                                                      }
+                                                                    ]
                                                                   }
-                                                                ]
+                                                                }
+                                                              },
+                                                              "kind": {
+                                                                "kind": "ArgumentKind::Positional",
+                                                                "loc": null,
+                                                                "children": {}
                                                               }
                                                             }
-                                                          },
-                                                          "kind": {
-                                                            "kind": "ArgumentKind::Positional",
-                                                            "loc": null,
-                                                            "children": {}
                                                           }
-                                                        }
+                                                        ]
+                                                      },
+                                                      "attr": {
+                                                        "kind": "ApplyAttr::NoAttr",
+                                                        "loc": null,
+                                                        "children": {}
                                                       }
-                                                    ]
-                                                  },
-                                                  "attr": {
-                                                    "kind": "ApplyAttr::NoAttr",
-                                                    "loc": null,
-                                                    "children": {}
+                                                    }
                                                   }
                                                 }
+                                              },
+                                              "group": {
+                                                "kind": "Group::Brace",
+                                                "loc": null,
+                                                "children": {}
                                               }
                                             }
                                           },
@@ -3616,7 +3627,7 @@
                                             "children": {}
                                           },
                                           "kind": {
-                                            "kind": "FnKind::Lambda",
+                                            "kind": "FnKind::Arrow",
                                             "loc": null,
                                             "children": {}
                                           },
@@ -3710,71 +3721,58 @@
                                             ]
                                           },
                                           "body": {
-                                            "kind": "Expr::Sequence",
+                                            "kind": "Expr::Group",
                                             "loc": null,
                                             "children": {
-                                              "exprs": {
-                                                "kind": "Expr::Sequence::ExprList",
+                                              "expr": {
+                                                "kind": "Expr::Sequence",
                                                 "loc": null,
-                                                "children": [
-                                                  {
-                                                    "kind": "Expr::For",
+                                                "children": {
+                                                  "exprs": {
+                                                    "kind": "Expr::Sequence::ExprList",
                                                     "loc": null,
-                                                    "children": {
-                                                      "binders": {
-                                                        "kind": "Expr::For::BindingList",
+                                                    "children": [
+                                                      {
+                                                        "kind": "Expr::For",
                                                         "loc": null,
-                                                        "children": [
-                                                          {
-                                                            "kind": "For::Binding",
+                                                        "children": {
+                                                          "binders": {
+                                                            "kind": "Expr::For::BindingList",
                                                             "loc": null,
-                                                            "children": {
-                                                              "binder": {
-                                                                "kind": "Binder",
-                                                                "loc": null,
-                                                                "children": {
-                                                                  "name": "i"
-                                                                }
-                                                              },
-                                                              "expr": {
-                                                                "kind": "Expr::Constant",
+                                                            "children": [
+                                                              {
+                                                                "kind": "For::Binding",
                                                                 "loc": null,
                                                                 "children": {
-                                                                  "constant": {
-                                                                    "kind": "Constant::Int",
+                                                                  "binder": {
+                                                                    "kind": "Binder",
                                                                     "loc": null,
                                                                     "children": {
-                                                                      "value": "0"
+                                                                      "name": "i"
+                                                                    }
+                                                                  },
+                                                                  "expr": {
+                                                                    "kind": "Expr::Constant",
+                                                                    "loc": null,
+                                                                    "children": {
+                                                                      "constant": {
+                                                                        "kind": "Constant::Int",
+                                                                        "loc": null,
+                                                                        "children": {
+                                                                          "value": "0"
+                                                                        }
+                                                                      }
                                                                     }
                                                                   }
                                                                 }
                                                               }
-                                                            }
-                                                          }
-                                                        ]
-                                                      },
-                                                      "condition": {
-                                                        "kind": "Expr::Infix",
-                                                        "loc": null,
-                                                        "children": {
-                                                          "op": {
-                                                            "kind": "Var",
-                                                            "loc": null,
-                                                            "children": {
-                                                              "name": {
-                                                                "kind": "LongIdent::Ident",
-                                                                "loc": null,
-                                                                "children": {
-                                                                  "value": "<"
-                                                                }
-                                                              }
-                                                            }
+                                                            ]
                                                           },
-                                                          "lhs": {
-                                                            "kind": "Expr::Ident",
+                                                          "condition": {
+                                                            "kind": "Expr::Infix",
                                                             "loc": null,
                                                             "children": {
-                                                              "id": {
+                                                              "op": {
                                                                 "kind": "Var",
                                                                 "loc": null,
                                                                 "children": {
@@ -3782,48 +3780,16 @@
                                                                     "kind": "LongIdent::Ident",
                                                                     "loc": null,
                                                                     "children": {
-                                                                      "value": "i"
+                                                                      "value": "<"
                                                                     }
                                                                   }
                                                                 }
-                                                              }
-                                                            }
-                                                          },
-                                                          "rhs": {
-                                                            "kind": "Expr::Constant",
-                                                            "loc": null,
-                                                            "children": {
-                                                              "constant": {
-                                                                "kind": "Constant::Int",
-                                                                "loc": null,
-                                                                "children": {
-                                                                  "value": "5"
-                                                                }
-                                                              }
-                                                            }
-                                                          }
-                                                        }
-                                                      },
-                                                      "continue_block": {
-                                                        "kind": "Expr::For::ContBindingList",
-                                                        "loc": null,
-                                                        "children": [
-                                                          {
-                                                            "kind": "For::ContBinding",
-                                                            "loc": null,
-                                                            "children": {
-                                                              "binder": {
-                                                                "kind": "Binder",
-                                                                "loc": null,
-                                                                "children": {
-                                                                  "name": "i"
-                                                                }
                                                               },
-                                                              "expr": {
-                                                                "kind": "Expr::Infix",
+                                                              "lhs": {
+                                                                "kind": "Expr::Ident",
                                                                 "loc": null,
                                                                 "children": {
-                                                                  "op": {
+                                                                  "id": {
                                                                     "kind": "Var",
                                                                     "loc": null,
                                                                     "children": {
@@ -3831,16 +3797,48 @@
                                                                         "kind": "LongIdent::Ident",
                                                                         "loc": null,
                                                                         "children": {
-                                                                          "value": "+"
+                                                                          "value": "i"
                                                                         }
                                                                       }
                                                                     }
+                                                                  }
+                                                                }
+                                                              },
+                                                              "rhs": {
+                                                                "kind": "Expr::Constant",
+                                                                "loc": null,
+                                                                "children": {
+                                                                  "constant": {
+                                                                    "kind": "Constant::Int",
+                                                                    "loc": null,
+                                                                    "children": {
+                                                                      "value": "5"
+                                                                    }
+                                                                  }
+                                                                }
+                                                              }
+                                                            }
+                                                          },
+                                                          "continue_block": {
+                                                            "kind": "Expr::For::ContBindingList",
+                                                            "loc": null,
+                                                            "children": [
+                                                              {
+                                                                "kind": "For::ContBinding",
+                                                                "loc": null,
+                                                                "children": {
+                                                                  "binder": {
+                                                                    "kind": "Binder",
+                                                                    "loc": null,
+                                                                    "children": {
+                                                                      "name": "i"
+                                                                    }
                                                                   },
-                                                                  "lhs": {
-                                                                    "kind": "Expr::Ident",
+                                                                  "expr": {
+                                                                    "kind": "Expr::Infix",
                                                                     "loc": null,
                                                                     "children": {
-                                                                      "id": {
+                                                                      "op": {
                                                                         "kind": "Var",
                                                                         "loc": null,
                                                                         "children": {
@@ -3848,120 +3846,182 @@
                                                                             "kind": "LongIdent::Ident",
                                                                             "loc": null,
                                                                             "children": {
-                                                                              "value": "i"
+                                                                              "value": "+"
                                                                             }
                                                                           }
                                                                         }
-                                                                      }
-                                                                    }
-                                                                  },
-                                                                  "rhs": {
-                                                                    "kind": "Expr::Constant",
-                                                                    "loc": null,
-                                                                    "children": {
-                                                                      "constant": {
-                                                                        "kind": "Constant::Int",
+                                                                      },
+                                                                      "lhs": {
+                                                                        "kind": "Expr::Ident",
                                                                         "loc": null,
                                                                         "children": {
-                                                                          "value": "1"
-                                                                        }
-                                                                      }
-                                                                    }
-                                                                  }
-                                                                }
-                                                              }
-                                                            }
-                                                          }
-                                                        ]
-                                                      },
-                                                      "body": {
-                                                        "kind": "Expr::Sequence",
-                                                        "loc": null,
-                                                        "children": {
-                                                          "exprs": {
-                                                            "kind": "Expr::Sequence::ExprList",
-                                                            "loc": null,
-                                                            "children": [
-                                                              {
-                                                                "kind": "Expr::Apply",
-                                                                "loc": null,
-                                                                "children": {
-                                                                  "func": {
-                                                                    "kind": "Expr::Ident",
-                                                                    "loc": null,
-                                                                    "children": {
-                                                                      "id": {
-                                                                        "kind": "Var",
+                                                                          "id": {
+                                                                            "kind": "Var",
+                                                                            "loc": null,
+                                                                            "children": {
+                                                                              "name": {
+                                                                                "kind": "LongIdent::Ident",
+                                                                                "loc": null,
+                                                                                "children": {
+                                                                                  "value": "i"
+                                                                                }
+                                                                              }
+                                                                            }
+                                                                          }
+                                                                        }
+                                                                      },
+                                                                      "rhs": {
+                                                                        "kind": "Expr::Constant",
                                                                         "loc": null,
                                                                         "children": {
-                                                                          "name": {
-                                                                            "kind": "LongIdent::Ident",
+                                                                          "constant": {
+                                                                            "kind": "Constant::Int",
                                                                             "loc": null,
                                                                             "children": {
-                                                                              "value": "println"
+                                                                              "value": "1"
                                                                             }
                                                                           }
                                                                         }
                                                                       }
                                                                     }
-                                                                  },
-                                                                  "args": {
-                                                                    "kind": "Expr::Apply::ArgumentList",
+                                                                  }
+                                                                }
+                                                              }
+                                                            ]
+                                                          },
+                                                          "body": {
+                                                            "kind": "Expr::Sequence",
+                                                            "loc": null,
+                                                            "children": {
+                                                              "exprs": {
+                                                                "kind": "Expr::Sequence::ExprList",
+                                                                "loc": null,
+                                                                "children": [
+                                                                  {
+                                                                    "kind": "Expr::Apply",
                                                                     "loc": null,
-                                                                    "children": [
-                                                                      {
-                                                                        "kind": "Argument",
+                                                                    "children": {
+                                                                      "func": {
+                                                                        "kind": "Expr::Ident",
                                                                         "loc": null,
                                                                         "children": {
-                                                                          "value": {
-                                                                            "kind": "Expr::Interp",
+                                                                          "id": {
+                                                                            "kind": "Var",
                                                                             "loc": null,
                                                                             "children": {
-                                                                              "elems": {
-                                                                                "kind": "Expr::Interp::ElemList",
+                                                                              "name": {
+                                                                                "kind": "LongIdent::Ident",
                                                                                 "loc": null,
-                                                                                "children": [
-                                                                                  {
-                                                                                    "kind": "InterpElem::Literal",
-                                                                                    "loc": null,
-                                                                                    "children": {
-                                                                                      "repr": "thread "
-                                                                                    }
-                                                                                  },
-                                                                                  {
-                                                                                    "kind": "InterpElem::Source",
-                                                                                    "loc": null,
-                                                                                    "children": {
-                                                                                      "source": "id"
-                                                                                    }
-                                                                                  },
-                                                                                  {
-                                                                                    "kind": "InterpElem::Literal",
-                                                                                    "loc": null,
-                                                                                    "children": {
-                                                                                      "repr": ": "
-                                                                                    }
-                                                                                  },
-                                                                                  {
-                                                                                    "kind": "InterpElem::Source",
+                                                                                "children": {
+                                                                                  "value": "println"
+                                                                                }
+                                                                              }
+                                                                            }
+                                                                          }
+                                                                        }
+                                                                      },
+                                                                      "args": {
+                                                                        "kind": "Expr::Apply::ArgumentList",
+                                                                        "loc": null,
+                                                                        "children": [
+                                                                          {
+                                                                            "kind": "Argument",
+                                                                            "loc": null,
+                                                                            "children": {
+                                                                              "value": {
+                                                                                "kind": "Expr::Interp",
+                                                                                "loc": null,
+                                                                                "children": {
+                                                                                  "elems": {
+                                                                                    "kind": "Expr::Interp::ElemList",
                                                                                     "loc": null,
-                                                                                    "children": {
-                                                                                      "source": "i"
-                                                                                    }
+                                                                                    "children": [
+                                                                                      {
+                                                                                        "kind": "InterpElem::Literal",
+                                                                                        "loc": null,
+                                                                                        "children": {
+                                                                                          "repr": "thread "
+                                                                                        }
+                                                                                      },
+                                                                                      {
+                                                                                        "kind": "InterpElem::Source",
+                                                                                        "loc": null,
+                                                                                        "children": {
+                                                                                          "source": "id"
+                                                                                        }
+                                                                                      },
+                                                                                      {
+                                                                                        "kind": "InterpElem::Literal",
+                                                                                        "loc": null,
+                                                                                        "children": {
+                                                                                          "repr": ": "
+                                                                                        }
+                                                                                      },
+                                                                                      {
+                                                                                        "kind": "InterpElem::Source",
+                                                                                        "loc": null,
+                                                                                        "children": {
+                                                                                          "source": "i"
+                                                                                        }
+                                                                                      }
+                                                                                    ]
                                                                                   }
-                                                                                ]
+                                                                                }
+                                                                              },
+                                                                              "kind": {
+                                                                                "kind": "ArgumentKind::Positional",
+                                                                                "loc": null,
+                                                                                "children": {}
                                                                               }
                                                                             }
-                                                                          },
-                                                                          "kind": {
-                                                                            "kind": "ArgumentKind::Positional",
+                                                                          }
+                                                                        ]
+                                                                      },
+                                                                      "attr": {
+                                                                        "kind": "ApplyAttr::NoAttr",
+                                                                        "loc": null,
+                                                                        "children": {}
+                                                                      }
+                                                                    }
+                                                                  }
+                                                                ]
+                                                              },
+                                                              "last_expr": {
+                                                                "kind": "Expr::DotApply",
+                                                                "loc": null,
+                                                                "children": {
+                                                                  "self": {
+                                                                    "kind": "Expr::Ident",
+                                                                    "loc": null,
+                                                                    "children": {
+                                                                      "id": {
+                                                                        "kind": "Var",
+                                                                        "loc": null,
+                                                                        "children": {
+                                                                          "name": {
+                                                                            "kind": "LongIdent::Ident",
                                                                             "loc": null,
-                                                                            "children": {}
+                                                                            "children": {
+                                                                              "value": "ctx"
+                                                                            }
                                                                           }
                                                                         }
                                                                       }
-                                                                    ]
+                                                                    }
+                                                                  },
+                                                                  "method_name": {
+                                                                    "kind": "Label",
+                                                                    "loc": null,
+                                                                    "children": {
+                                                                      "name": "suspend"
+                                                                    }
+                                                                  },
+                                                                  "args": {
+                                                                    "kind": "Expr::DotApply::ArgList",
+                                                                    "loc": null,
+                                                                    "children": []
                                                                   },
+                                                                  "return_self": false,
                                                                   "attr": {
                                                                     "kind": "ApplyAttr::NoAttr",
                                                                     "loc": null,
@@ -3969,139 +4029,101 @@
                                                                   }
                                                                 }
                                                               }
-                                                            ]
+                                                            }
                                                           },
-                                                          "last_expr": {
-                                                            "kind": "Expr::DotApply",
+                                                          "for_else": null,
+                                                          "where_clause": null,
+                                                          "label": null
+                                                        }
+                                                      }
+                                                    ]
+                                                  },
+                                                  "last_expr": {
+                                                    "kind": "Expr::Apply",
+                                                    "loc": null,
+                                                    "children": {
+                                                      "func": {
+                                                        "kind": "Expr::Ident",
+                                                        "loc": null,
+                                                        "children": {
+                                                          "id": {
+                                                            "kind": "Var",
                                                             "loc": null,
                                                             "children": {
-                                                              "self": {
-                                                                "kind": "Expr::Ident",
+                                                              "name": {
+                                                                "kind": "LongIdent::Ident",
                                                                 "loc": null,
                                                                 "children": {
-                                                                  "id": {
-                                                                    "kind": "Var",
+                                                                  "value": "println"
+                                                                }
+                                                              }
+                                                            }
+                                                          }
+                                                        }
+                                                      },
+                                                      "args": {
+                                                        "kind": "Expr::Apply::ArgumentList",
+                                                        "loc": null,
+                                                        "children": [
+                                                          {
+                                                            "kind": "Argument",
+                                                            "loc": null,
+                                                            "children": {
+                                                              "value": {
+                                                                "kind": "Expr::Interp",
+                                                                "loc": null,
+                                                                "children": {
+                                                                  "elems": {
+                                                                    "kind": "Expr::Interp::ElemList",
                                                                     "loc": null,
-                                                                    "children": {
-                                                                      "name": {
-                                                                        "kind": "LongIdent::Ident",
+                                                                    "children": [
+                                                                      {
+                                                                        "kind": "InterpElem::Literal",
+                                                                        "loc": null,
+                                                                        "children": {
+                                                                          "repr": "thread "
+                                                                        }
+                                                                      },
+                                                                      {
+                                                                        "kind": "InterpElem::Source",
+                                                                        "loc": null,
+                                                                        "children": {
+                                                                          "source": "id"
+                                                                        }
+                                                                      },
+                                                                      {
+                                                                        "kind": "InterpElem::Literal",
                                                                         "loc": null,
                                                                         "children": {
-                                                                          "value": "ctx"
+                                                                          "repr": ": done"
                                                                         }
                                                                       }
-                                                                    }
+                                                                    ]
                                                                   }
                                                                 }
                                                               },
-                                                              "method_name": {
-                                                                "kind": "Label",
-                                                                "loc": null,
-                                                                "children": {
-                                                                  "name": "suspend"
-                                                                }
-                                                              },
-                                                              "args": {
-                                                                "kind": "Expr::DotApply::ArgList",
-                                                                "loc": null,
-                                                                "children": []
-                                                              },
-                                                              "return_self": false,
-                                                              "attr": {
-                                                                "kind": "ApplyAttr::NoAttr",
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                                                               }
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                                               }
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@@ -4112,7 +4134,7 @@
                                             "children": {}
                                           },
                                           "kind": {
-                                            "kind": "FnKind::Lambda",
+                                            "kind": "FnKind::Arrow",
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@@ -7030,361 +7052,8 @@
                         "children": {
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-                                            "children": {
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-                                    "children": {}
-                                  }
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                                 "loc": null,
@@ -7452,256 +7121,267 @@
                                                     ]
                                                   },
                                                   "body": {
-                                                    "kind": "Expr::Try",
+                                                    "kind": "Expr::Group",
                                                     "loc": null,
                                                     "children": {
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-                                                        "kind": "Expr::Group",
+                                                      "expr": {
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                                                         "loc": null,
                                                         "children": {
-                                                          "expr": {
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                                                             "children": {
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-                                                                "loc": null,
-                                                                "children": []
-                                                              },
-                                                              "body": {
-                                                                "kind": "Expr::Apply",
+                                                              "expr": {
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                                                                 "loc": null,
                                                                 "children": {
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-                                                                    "kind": "Expr::Ident",
+                                                                  "binders": {
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+                                                                    "loc": null,
+                                                                    "children": []
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+                                                                  "continue_block": {
+                                                                    "kind": "Expr::For::ContBindingList",
+                                                                    "loc": null,
+                                                                    "children": []
+                                                                  },
+                                                                  "body": {
+                                                                    "kind": "Expr::Apply",
                                                                     "loc": null,
                                                                     "children": {
-                                                                      "id": {
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+                                                                      "func": {
+                                                                        "kind": "Expr::Ident",
                                                                         "loc": null,
                                                                         "children": {
-                                                                          "name": {
-                                                                            "kind": "LongIdent::Ident",
+                                                                          "id": {
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                                                                             "loc": null,
                                                                             "children": {
-                                                                              "value": "println"
+                                                                              "name": {
+                                                                                "kind": "LongIdent::Ident",
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+                                                                                "children": {
+                                                                                  "value": "println"
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                                                                             }
                                                                           }
                                                                         }
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-                                                                      {
-                                                                        "kind": "Argument",
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-                                                                                    }
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+                                                                                "children": {
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                                                                           }
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-                                                                      "id": {
-                                                                        "kind": "Var",
+                                                                      "func": {
+                                                                        "kind": "Expr::Ident",
                                                                         "loc": null,
                                                                         "children": {
-                                                                          "name": {
-                                                                            "kind": "LongIdent::Ident",
+                                                                          "id": {
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                                                                             "loc": null,
                                                                             "children": {
-                                                                              "value": "println"
+                                                                              "name": {
+                                                                                "kind": "LongIdent::Ident",
+                                                                                "loc": null,
+                                                                                "children": {
+                                                                                  "value": "println"
+                                                                                }
+                                                                              }
                                                                             }
                                                                           }
                                                                         }
-                                                                      }
-                                                                    }
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-                                                                    "loc": null,
-                                                                    "children": [
-                                                                      {
-                                                                        "kind": "Argument",
+                                                                      },
+                                                                      "args": {
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                                                                         "loc": null,
-                                                                        "children": {
-                                                                          "value": {
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+                                                                        "children": [
+                                                                          {
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                                                                             "loc": null,
                                                                             "children": {
-                                                                              "elems": {
-                                                                                "kind": "Expr::Interp::ElemList",
+                                                                              "value": {
+                                                                                "kind": "Expr::Interp",
                                                                                 "loc": null,
-                                                                                "children": [
-                                                                                  {
-                                                                                    "kind": "InterpElem::Literal",
-                                                                                    "loc": null,
-                                                                                    "children": {
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-                                                                                    }
-                                                                                  },
-                                                                                  {
-                                                                                    "kind": "InterpElem::Source",
-                                                                                    "loc": null,
-                                                                                    "children": {
-                                                                                      "source": "id"
-                                                                                    }
-                                                                                  },
-                                                                                  {
-                                                                                    "kind": "InterpElem::Literal",
+                                                                                "children": {
+                                                                                  "elems": {
+                                                                                    "kind": "Expr::Interp::ElemList",
                                                                                     "loc": null,
-                                                                                    "children": {
-                                                                                      "repr": ": received termination"
-                                                                                    }
+                                                                                    "children": [
+                                                                                      {
+                                                                                        "kind": "InterpElem::Literal",
+                                                                                        "loc": null,
+                                                                                        "children": {
+                                                                                          "repr": "thread "
+                                                                                        }
+                                                                                      },
+                                                                                      {
+                                                                                        "kind": "InterpElem::Source",
+                                                                                        "loc": null,
+                                                                                        "children": {
+                                                                                          "source": "id"
+                                                                                        }
+                                                                                      },
+                                                                                      {
+                                                                                        "kind": "InterpElem::Literal",
+                                                                                        "loc": null,
+                                                                                        "children": {
+                                                                                          "repr": ": received termination"
+                                                                                        }
+                                                                                      }
+                                                                                    ]
                                                                                   }
-                                                                                ]
+                                                                                }
+                                                                              },
+                                                                              "kind": {
+                                                                                "kind": "ArgumentKind::Positional",
+                                                                                "loc": null,
+                                                                                "children": {}
                                                                               }
                                                                             }
-                                                                          },
-                                                                          "kind": {
-                                                                            "kind": "ArgumentKind::Positional",
-                                                                            "loc": null,
-                                                                            "children": {}
                                                                           }
-                                                                        }
+                                                                        ]
+                                                                      },
+                                                                      "attr": {
+                                                                        "kind": "ApplyAttr::NoAttr",
+                                                                        "loc": null,
+                                                                        "children": {}
                                                                       }
-                                                                    ]
-                                                                  },
-                                                                  "attr": {
-                                                                    "kind": "ApplyAttr::NoAttr",
-                                                                    "loc": null,
-                                                                    "children": {}
+                                                                    }
                                                                   }
                                                                 }
                                                               }
-                                                            }
-                                                          }
-                                                        ]
+                                                            ]
+                                                          },
+                                                          "catch_all": false,
+                                                          "try_else": null,
+                                                          "has_try": true
+                                                        }
                                                       },
-                                                      "catch_all": false,
-                                                      "try_else": null,
-                                                      "has_try": true
+                                                      "group": {
+                                                        "kind": "Group::Brace",
+                                                        "loc": null,
+                                                        "children": {}
+                                                      }
                                                     }
                                                   },
                                                   "return_type": null,
@@ -7711,7 +7391,7 @@
                                                     "children": {}
                                                   },
                                                   "kind": {
-                                                    "kind": "FnKind::Lambda",
+                                                    "kind": "FnKind::Arrow",
                                                     "loc": null,
                                                     "children": {}
                                                   },
@@ -7805,22 +7485,33 @@
                                                     ]
                                                   },
                                                   "body": {
-                                                    "kind": "Expr::Try",
+                                                    "kind": "Expr::Group",
                                                     "loc": null,
                                                     "children": {
-                                                      "body": {
-                                                        "kind": "Expr::Group",
+                                                      "expr": {
+                                                        "kind": "Expr::Try",
                                                         "loc": null,
                                                         "children": {
-                                                          "expr": {
-                                                            "kind": "Expr::Sequence",
+                                                          "body": {
+                                                            "kind": "Expr::Group",
                                                             "loc": null,
                                                             "children": {
-                                                              "exprs": {
-                                                                "kind": "Expr::Sequence::ExprList",
+                                                              "expr": {
+                                                                "kind": "Expr::For",
                                                                 "loc": null,
-                                                                "children": [
-                                                                  {
+                                                                "children": {
+                                                                  "binders": {
+                                                                    "kind": "Expr::For::BindingList",
+                                                                    "loc": null,
+                                                                    "children": []
+                                                                  },
+                                                                  "condition": null,
+                                                                  "continue_block": {
+                                                                    "kind": "Expr::For::ContBindingList",
+                                                                    "loc": null,
+                                                                    "children": []
+                                                                  },
+                                                                  "body": {
                                                                     "kind": "Expr::Apply",
                                                                     "loc": null,
                                                                     "children": {
@@ -7877,7 +7568,21 @@
                                                                                         "kind": "InterpElem::Literal",
                                                                                         "loc": null,
                                                                                         "children": {
-                                                                                          "repr": ": sending 1 to channel 1"
+                                                                                          "repr": ": received "
+                                                                                        }
+                                                                                      },
+                                                                                      {
+                                                                                        "kind": "InterpElem::Source",
+                                                                                        "loc": null,
+                                                                                        "children": {
+                                                                                          "source": "c2.recv()"
+                                                                                        }
+                                                                                      },
+                                                                                      {
+                                                                                        "kind": "InterpElem::Literal",
+                                                                                        "loc": null,
+                                                                                        "children": {
+                                                                                          "repr": " from channel 2"
                                                                                         }
                                                                                       }
                                                                                     ]
@@ -7900,599 +7605,1067 @@
                                                                       }
                                                                     }
                                                                   },
-                                                                  {
-                                                                    "kind": "Expr::DotApply",
+                                                                  "for_else": null,
+                                                                  "where_clause": null,
+                                                                  "label": null
+                                                                }
+                                                              },
+                                                              "group": {
+                                                                "kind": "Group::Brace",
+                                                                "loc": null,
+                                                                "children": {}
+                                                              }
+                                                            }
+                                                          },
+                                                          "catch": {
+                                                            "kind": "Expr::Try::CaseList",
+                                                            "loc": null,
+                                                            "children": [
+                                                              {
+                                                                "kind": "Case",
+                                                                "loc": null,
+                                                                "children": {
+                                                                  "pattern": {
+                                                                    "kind": "Pattern::Constr",
                                                                     "loc": null,
                                                                     "children": {
-                                                                      "self": {
+                                                                      "constr": {
+                                                                        "kind": "Constructor",
+                                                                        "loc": null,
+                                                                        "children": {
+                                                                          "name": {
+                                                                            "kind": "ConstrName",
+                                                                            "loc": null,
+                                                                            "children": {
+                                                                              "name": "ChannelTerminated"
+                                                                            }
+                                                                          },
+                                                                          "extra_info": {
+                                                                            "kind": "ConstructorExtraInfo::NoExtraInfo",
+                                                                            "loc": null,
+                                                                            "children": {}
+                                                                          }
+                                                                        }
+                                                                      },
+                                                                      "args": null,
+                                                                      "is_open": false
+                                                                    }
+                                                                  },
+                                                                  "guard": null,
+                                                                  "body": {
+                                                                    "kind": "Expr::Apply",
+                                                                    "loc": null,
+                                                                    "children": {
+                                                                      "func": {
                                                                         "kind": "Expr::Ident",
                                                                         "loc": null,
                                                                         "children": {
-                                                                          "id": {
-                                                                            "kind": "Var",
+                                                                          "id": {
+                                                                            "kind": "Var",
+                                                                            "loc": null,
+                                                                            "children": {
+                                                                              "name": {
+                                                                                "kind": "LongIdent::Ident",
+                                                                                "loc": null,
+                                                                                "children": {
+                                                                                  "value": "println"
+                                                                                }
+                                                                              }
+                                                                            }
+                                                                          }
+                                                                        }
+                                                                      },
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+                                                                                      {
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+                                                                                        "children": {
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+                                                                                        }
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+                                                                                      {
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+                                                                                        "children": {
+                                                                                          "source": "id"
+                                                                                        }
+                                                                                      },
+                                                                                      {
+                                                                                        "kind": "InterpElem::Literal",
+                                                                                        "loc": null,
+                                                                                        "children": {
+                                                                                          "repr": ": received termination"
+                                                                                        }
+                                                                                      }
+                                                                                    ]
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+                                                                                }
+                                                                              },
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+                                                                                "loc": null,
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+                                                                      "attr": {
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+                                                                        "loc": null,
+                                                                        "children": {}
+                                                                      }
+                                                                    }
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+                                                            ]
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+                                                          "has_try": true
+                                                        }
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+                                                        "loc": null,
+                                                        "children": {}
+                                                      }
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+                                                  "error_type": {
+                                                    "kind": "ErrorType::NoErrorType",
+                                                    "loc": null,
+                                                    "children": {}
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+                                                  "kind": {
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+                                                    "loc": null,
+                                                    "children": {}
+                                                  },
+                                                  "has_error": null,
+                                                  "is_async": null
+                                                }
+                                              }
+                                            }
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+                                            "children": {}
+                                          }
+                                        }
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+                                    ]
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+                                  "attr": {
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+                                    "children": {}
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+                                        "children": {
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+                                            "loc": null,
+                                            "children": {
+                                              "value": "ctx"
+                                            }
+                                          }
+                                        }
+                                      }
+                                    }
+                                  },
+                                  "method_name": {
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+                                    "children": {
+                                      "name": "spawn"
+                                    }
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+                                                "children": {
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+                                                        "children": {
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+                                                            "children": {
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+                                                        }
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                                                                                 "children": {
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+                                                                                  "name": {
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+                                                                                    "children": {
+                                                                                      "value": "println"
+                                                                                    }
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                                                                                 }
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+                                                                                  "value": {
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                                                                                     "loc": null,
                                                                                     "children": {
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+                                                                                      "elems": {
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+                                                                                            "children": {
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+                                                                                            "children": {
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+                                                                                            }
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+                                                                                          {
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+                                                                                            "children": {
+                                                                                              "repr": ": sending 1 to channel 1"
+                                                                                            }
+                                                                                          }
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                                                                                     }
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                                                                                   }
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                                                                               }
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                                                                           }
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-                                                                    "children": {
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+                                                                      {
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                                                                         "loc": null,
                                                                         "children": {
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                                                                                 "children": {
-                                                                                  "value": "println"
+                                                                                  "name": {
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+                                                                                    "loc": null,
+                                                                                    "children": {
+                                                                                      "value": "c1"
+                                                                                    }
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                                                                                 }
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                                                                                         "loc": null,
                                                                                         "children": {
-                                                                                          "repr": ": sending 2 to channel 2"
+                                                                                          "value": "1"
                                                                                         }
                                                                                       }
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+                                                                                  },
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                                                                           }
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+                                                                      {
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                                                                         "children": {
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-                                                                              "kind": {
-                                                                                "kind": "ArgumentKind::Positional",
-                                                                                "loc": null,
-                                                                                "children": {}
                                                                               }
                                                                             }
-                                                                          }
-                                                                        ]
-                                                                      },
-                                                                      "return_self": false,
-                                                                      "attr": {
-                                                                        "kind": "ApplyAttr::NoAttr",
-                                                                        "loc": null,
-                                                                        "children": {}
-                                                                      }
-                                                                    }
-                                                                  },
-                                                                  {
-                                                                    "kind": "Expr::Apply",
-                                                                    "loc": null,
-                                                                    "children": {
-                                                                      "func": {
-                                                                        "kind": "Expr::Ident",
+                                                                          },
+                                                                          "method_name": {
+                                                                            "kind": "Label",
+                                                                            "loc": null,
+                                                                            "children": {
+                                                                              "name": "terminate"
+                                                                            }
+                                                                          },
+                                                                          "args": {
+                                                                            "kind": "Expr::DotApply::ArgList",
+                                                                            "loc": null,
+                                                                            "children": []
+                                                                          },
+                                                                          "return_self": false,
+                                                                          "attr": {
+                                                                            "kind": "ApplyAttr::NoAttr",
+                                                                            "loc": null,
+                                                                            "children": {}
+                                                                          }
+                                                                        }
+                                                                      },
+                                                                      {
+                                                                        "kind": "Expr::Apply",
                                                                         "loc": null,
                                                                         "children": {
-                                                                          "id": {
-                                                                            "kind": "Var",
+                                                                          "func": {
+                                                                            "kind": "Expr::Ident",
                                                                             "loc": null,
                                                                             "children": {
-                                                                              "name": {
-                                                                                "kind": "LongIdent::Ident",
+                                                                              "id": {
+                                                                                "kind": "Var",
                                                                                 "loc": null,
                                                                                 "children": {
-                                                                                  "value": "println"
+                                                                                  "name": {
+                                                                                    "kind": "LongIdent::Ident",
+                                                                                    "loc": null,
+                                                                                    "children": {
+                                                                                      "value": "println"
+                                                                                    }
+                                                                                  }
                                                                                 }
                                                                               }
                                                                             }
-                                                                          }
-                                                                        }
-                                                                      },
-                                                                      "args": {
-                                                                        "kind": "Expr::Apply::ArgumentList",
-                                                                        "loc": null,
-                                                                        "children": [
-                                                                          {
-                                                                            "kind": "Argument",
+                                                                          },
+                                                                          "args": {
+                                                                            "kind": "Expr::Apply::ArgumentList",
                                                                             "loc": null,
-                                                                            "children": {
-                                                                              "value": {
-                                                                                "kind": "Expr::Interp",
+                                                                            "children": [
+                                                                              {
+                                                                                "kind": "Argument",
                                                                                 "loc": null,
                                                                                 "children": {
-                                                                                  "elems": {
-                                                                                    "kind": "Expr::Interp::ElemList",
+                                                                                  "value": {
+                                                                                    "kind": "Expr::Interp",
                                                                                     "loc": null,
-                                                                                    "children": [
-                                                                                      {
-                                                                                        "kind": "InterpElem::Literal",
-                                                                                        "loc": null,
-                                                                                        "children": {
-                                                                                          "repr": "thread "
-                                                                                        }
-                                                                                      },
-                                                                                      {
-                                                                                        "kind": "InterpElem::Source",
-                                                                                        "loc": null,
-                                                                                        "children": {
-                                                                                          "source": "id"
-                                                                                        }
-                                                                                      },
-                                                                                      {
-                                                                                        "kind": "InterpElem::Literal",
+                                                                                    "children": {
+                                                                                      "elems": {
+                                                                                        "kind": "Expr::Interp::ElemList",
                                                                                         "loc": null,
-                                                                                        "children": {
-                                                                                          "repr": ": terminating channel 1"
-                                                                                        }
+                                                                                        "children": [
+                                                                                          {
+                                                                                            "kind": "InterpElem::Literal",
+                                                                                            "loc": null,
+                                                                                            "children": {
+                                                                                              "repr": "thread "
+                                                                                            }
+                                                                                          },
+                                                                                          {
+                                                                                            "kind": "InterpElem::Source",
+                                                                                            "loc": null,
+                                                                                            "children": {
+                                                                                              "source": "id"
+                                                                                            }
+                                                                                          },
+                                                                                          {
+                                                                                            "kind": "InterpElem::Literal",
+                                                                                            "loc": null,
+                                                                                            "children": {
+                                                                                              "repr": ": terminating channel 2"
+                                                                                            }
+                                                                                          }
+                                                                                        ]
                                                                                       }
-                                                                                    ]
+                                                                                    }
+                                                                                  },
+                                                                                  "kind": {
+                                                                                    "kind": "ArgumentKind::Positional",
+                                                                                    "loc": null,
+                                                                                    "children": {}
                                                                                   }
                                                                                 }
-                                                                              },
-                                                                              "kind": {
-                                                                                "kind": "ArgumentKind::Positional",
-                                                                                "loc": null,
-                                                                                "children": {}
                                                                               }
-                                                                            }
+                                                                            ]
+                                                                          },
+                                                                          "attr": {
+                                                                            "kind": "ApplyAttr::NoAttr",
+                                                                            "loc": null,
+                                                                            "children": {}
                                                                           }
-                                                                        ]
-                                                                      },
-                                                                      "attr": {
-                                                                        "kind": "ApplyAttr::NoAttr",
-                                                                        "loc": null,
-                                                                        "children": {}
+                                                                        }
                                                                       }
-                                                                    }
+                                                                    ]
                                                                   },
-                                                                  {
+                                                                  "last_expr": {
                                                                     "kind": "Expr::DotApply",
                                                                     "loc": null,
                                                                     "children": {
@@ -8508,7 +8681,7 @@
                                                                                 "kind": "LongIdent::Ident",
                                                                                 "loc": null,
                                                                                 "children": {
-                                                                                  "value": "c1"
+                                                                                  "value": "c2"
                                                                                 }
                                                                               }
                                                                             }
@@ -8534,8 +8707,52 @@
                                                                         "children": {}
                                                                       }
                                                                     }
+                                                                  }
+                                                                }
+                                                              },
+                                                              "group": {
+                                                                "kind": "Group::Brace",
+                                                                "loc": null,
+                                                                "children": {}
+                                                              }
+                                                            }
+                                                          },
+                                                          "catch": {
+                                                            "kind": "Expr::Try::CaseList",
+                                                            "loc": null,
+                                                            "children": [
+                                                              {
+                                                                "kind": "Case",
+                                                                "loc": null,
+                                                                "children": {
+                                                                  "pattern": {
+                                                                    "kind": "Pattern::Constr",
+                                                                    "loc": null,
+                                                                    "children": {
+                                                                      "constr": {
+                                                                        "kind": "Constructor",
+                                                                        "loc": null,
+                                                                        "children": {
+                                                                          "name": {
+                                                                            "kind": "ConstrName",
+                                                                            "loc": null,
+                                                                            "children": {
+                                                                              "name": "ChannelTerminated"
+                                                                            }
+                                                                          },
+                                                                          "extra_info": {
+                                                                            "kind": "ConstructorExtraInfo::NoExtraInfo",
+                                                                            "loc": null,
+                                                                            "children": {}
+                                                                          }
+                                                                        }
+                                                                      },
+                                                                      "args": null,
+                                                                      "is_open": false
+                                                                    }
                                                                   },
-                                                                  {
+                                                                  "guard": null,
+                                                                  "body": {
                                                                     "kind": "Expr::Apply",
                                                                     "loc": null,
                                                                     "children": {
@@ -8551,7 +8768,7 @@
                                                                                 "kind": "LongIdent::Ident",
                                                                                 "loc": null,
                                                                                 "children": {
-                                                                                  "value": "println"
+                                                                                  "value": "abort"
                                                                                 }
                                                                               }
                                                                             }
@@ -8567,35 +8784,15 @@
                                                                             "loc": null,
                                                                             "children": {
                                                                               "value": {
-                                                                                "kind": "Expr::Interp",
+                                                                                "kind": "Expr::Constant",
                                                                                 "loc": null,
                                                                                 "children": {
-                                                                                  "elems": {
-                                                                                    "kind": "Expr::Interp::ElemList",
+                                                                                  "constant": {
+                                                                                    "kind": "Constant::String",
                                                                                     "loc": null,
-                                                                                    "children": [
-                                                                                      {
-                                                                                        "kind": "InterpElem::Literal",
-                                                                                        "loc": null,
-                                                                                        "children": {
-                                                                                          "repr": "thread "
-                                                                                        }
-                                                                                      },
-                                                                                      {
-                                                                                        "kind": "InterpElem::Source",
-                                                                                        "loc": null,
-                                                                                        "children": {
-                                                                                          "source": "id"
-                                                                                        }
-                                                                                      },
-                                                                                      {
-                                                                                        "kind": "InterpElem::Literal",
-                                                                                        "loc": null,
-                                                                                        "children": {
-                                                                                          "repr": ": terminating channel 2"
-                                                                                        }
-                                                                                      }
-                                                                                    ]
+                                                                                    "children": {
+                                                                                      "value": "unexpected termination of channel"
+                                                                                    }
                                                                                   }
                                                                                 }
                                                                               },
@@ -8615,162 +8812,20 @@
                                                                       }
                                                                     }
                                                                   }
-                                                                ]
-                                                              },
-                                                              "last_expr": {
-                                                                "kind": "Expr::DotApply",
-                                                                "loc": null,
-                                                                "children": {
-                                                                  "self": {
-                                                                    "kind": "Expr::Ident",
-                                                                    "loc": null,
-                                                                    "children": {
-                                                                      "id": {
-                                                                        "kind": "Var",
-                                                                        "loc": null,
-                                                                        "children": {
-                                                                          "name": {
-                                                                            "kind": "LongIdent::Ident",
-                                                                            "loc": null,
-                                                                            "children": {
-                                                                              "value": "c2"
-                                                                            }
-                                                                          }
-                                                                        }
-                                                                      }
-                                                                    }
-                                                                  },
-                                                                  "method_name": {
-                                                                    "kind": "Label",
-                                                                    "loc": null,
-                                                                    "children": {
-                                                                      "name": "terminate"
-                                                                    }
-                                                                  },
-                                                                  "args": {
-                                                                    "kind": "Expr::DotApply::ArgList",
-                                                                    "loc": null,
-                                                                    "children": []
-                                                                  },
-                                                                  "return_self": false,
-                                                                  "attr": {
-                                                                    "kind": "ApplyAttr::NoAttr",
-                                                                    "loc": null,
-                                                                    "children": {}
-                                                                  }
                                                                 }
                                                               }
-                                                            }
+                                                            ]
                                                           },
-                                                          "group": {
-                                                            "kind": "Group::Brace",
-                                                            "loc": null,
-                                                            "children": {}
-                                                          }
+                                                          "catch_all": false,
+                                                          "try_else": null,
+                                                          "has_try": true
                                                         }
                                                       },
-                                                      "catch": {
-                                                        "kind": "Expr::Try::CaseList",
+                                                      "group": {
+                                                        "kind": "Group::Brace",
                                                         "loc": null,
-                                                        "children": [
-                                                          {
-                                                            "kind": "Case",
-                                                            "loc": null,
-                                                            "children": {
-                                                              "pattern": {
-                                                                "kind": "Pattern::Constr",
-                                                                "loc": null,
-                                                                "children": {
-                                                                  "constr": {
-                                                                    "kind": "Constructor",
-                                                                    "loc": null,
-                                                                    "children": {
-                                                                      "name": {
-                                                                        "kind": "ConstrName",
-                                                                        "loc": null,
-                                                                        "children": {
-                                                                          "name": "ChannelTerminated"
-                                                                        }
-                                                                      },
-                                                                      "extra_info": {
-                                                                        "kind": "ConstructorExtraInfo::NoExtraInfo",
-                                                                        "loc": null,
-                                                                        "children": {}
-                                                                      }
-                                                                    }
-                                                                  },
-                                                                  "args": null,
-                                                                  "is_open": false
-                                                                }
-                                                              },
-                                                              "guard": null,
-                                                              "body": {
-                                                                "kind": "Expr::Apply",
-                                                                "loc": null,
-                                                                "children": {
-                                                                  "func": {
-                                                                    "kind": "Expr::Ident",
-                                                                    "loc": null,
-                                                                    "children": {
-                                                                      "id": {
-                                                                        "kind": "Var",
-                                                                        "loc": null,
-                                                                        "children": {
-                                                                          "name": {
-                                                                            "kind": "LongIdent::Ident",
-                                                                            "loc": null,
-                                                                            "children": {
-                                                                              "value": "abort"
-                                                                            }
-                                                                          }
-                                                                        }
-                                                                      }
-                                                                    }
-                                                                  },
-                                                                  "args": {
-                                                                    "kind": "Expr::Apply::ArgumentList",
-                                                                    "loc": null,
-                                                                    "children": [
-                                                                      {
-                                                                        "kind": "Argument",
-                                                                        "loc": null,
-                                                                        "children": {
-                                                                          "value": {
-                                                                            "kind": "Expr::Constant",
-                                                                            "loc": null,
-                                                                            "children": {
-                                                                              "constant": {
-                                                                                "kind": "Constant::String",
-                                                                                "loc": null,
-                                                                                "children": {
-                                                                                  "value": "unexpected termination of channel"
-                                                                                }
-                                                                              }
-                                                                            }
-                                                                          },
-                                                                          "kind": {
-                                                                            "kind": "ArgumentKind::Positional",
-                                                                            "loc": null,
-                                                                            "children": {}
-                                                                          }
-                                                                        }
-                                                                      }
-                                                                    ]
-                                                                  },
-                                                                  "attr": {
-                                                                    "kind": "ApplyAttr::NoAttr",
-                                                                    "loc": null,
-                                                                    "children": {}
-                                                                  }
-                                                                }
-                                                              }
-                                                            }
-                                                          }
-                                                        ]
-                                                      },
-                                                      "catch_all": false,
-                                                      "try_else": null,
-                                                      "has_try": true
+                                                        "children": {}
+                                                      }
                                                     }
                                                   },
                                                   "return_type": null,
@@ -8780,7 +8835,7 @@
                                                     "children": {}
                                                   },
                                                   "kind": {
-                                                    "kind": "FnKind::Lambda",
+                                                    "kind": "FnKind::Arrow",
                                                     "loc": null,
                                                     "children": {}
                                                   },
diff --git a/test/sync_test/__snapshot__/pipeline_test_coroutine.mbt b/test/sync_test/__snapshot__/pipeline_test_coroutine.mbt
index a9182c76..f6c43195 100644
--- a/test/sync_test/__snapshot__/pipeline_test_coroutine.mbt
+++ b/test/sync_test/__snapshot__/pipeline_test_coroutine.mbt
@@ -34,27 +34,25 @@ fn Scheduler::run_all(self : Scheduler) -> Unit {
 fn Scheduler::spawn_lazy(self : Scheduler, f : async (Int) -> Unit noraise) -> Unit {
   let id = self.next_id
   self.next_id += 1
-  self.coros.push(fn () {
-    run_async(fn () { f(id) })
-  })
+  self.coros.push(() => run_async(() => f(id)))
 }
 
 fn Scheduler::spawn(self : Scheduler, f : async (Int) -> Unit noraise) -> Unit {
   let id = self.next_id
   self.next_id += 1
-  run_async(fn () { f(id) })
+  run_async(() => f(id))
 }
 
 fn init {
   let ctx = Scheduler::new()
-  ctx.spawn_lazy(fn (id) {
+  ctx.spawn_lazy(id => {
     for i = 0; i < 10; i = i + 1 {
       println("thread \{id}: \{i}")
       ctx.suspend()
     }
     println("thread \{id}: done")
   })
-  ctx.spawn(fn (id) {
+  ctx.spawn(id => {
     for i = 0; i < 5; i = i + 1 {
       println("thread \{id}: \{i}")
       ctx.suspend()
@@ -122,7 +120,7 @@ fn init {
   let ctx = Scheduler::new()
   let c1 : Channel[Int] = ctx.make_channel()
   let c2 : Channel[Int] = ctx.make_channel()
-  ctx.spawn(fn (id) {
+  ctx.spawn(id => {
     try {
       for {
         println("thread \{id}: received \{c1.recv()} from channel 1")
@@ -131,7 +129,7 @@ fn init {
       ChannelTerminated => println("thread \{id}: received termination")
     }
   })
-  ctx.spawn(fn (id) {
+  ctx.spawn(id => {
     try {
       for {
         println("thread \{id}: received \{c2.recv()} from channel 2")
@@ -140,7 +138,7 @@ fn init {
       ChannelTerminated => println("thread \{id}: received termination")
     }
   })
-  ctx.spawn(fn (id) {
+  ctx.spawn(id => {
     try {
       println("thread \{id}: sending 1 to channel 1")
       c1.send(1)
diff --git a/test/sync_test/__snapshot__/pipeline_test_coroutine.mbt.tokens.json b/test/sync_test/__snapshot__/pipeline_test_coroutine.mbt.tokens.json
index 18f44931..32478131 100644
--- a/test/sync_test/__snapshot__/pipeline_test_coroutine.mbt.tokens.json
+++ b/test/sync_test/__snapshot__/pipeline_test_coroutine.mbt.tokens.json
@@ -1398,1028 +1398,980 @@
     "token": "LPAREN",
     "loc": "37:18-37:19"
   },
-  {
-    "token": "FN",
-    "loc": "37:19-37:21"
-  },
   {
     "token": "LPAREN",
-    "loc": "37:22-37:23"
+    "loc": "37:19-37:20"
   },
   {
     "token": "RPAREN",
-    "loc": "37:23-37:24"
-  },
-  {
-    "token": "LBRACE",
-    "loc": "37:25-37:26"
+    "loc": "37:20-37:21"
   },
   {
-    "token": "NEWLINE",
-    "loc": "37:26-37:27"
+    "token": "FAT_ARROW",
+    "loc": "37:22-37:24"
   },
   {
     "token": [
       "LIDENT",
       "run_async"
     ],
-    "loc": "38:5-38:14"
+    "loc": "37:25-37:34"
   },
   {
     "token": "LPAREN",
-    "loc": "38:14-38:15"
-  },
-  {
-    "token": "FN",
-    "loc": "38:15-38:17"
+    "loc": "37:34-37:35"
   },
   {
     "token": "LPAREN",
-    "loc": "38:18-38:19"
+    "loc": "37:35-37:36"
   },
   {
     "token": "RPAREN",
-    "loc": "38:19-38:20"
+    "loc": "37:36-37:37"
   },
   {
-    "token": "LBRACE",
-    "loc": "38:21-38:22"
+    "token": "FAT_ARROW",
+    "loc": "37:38-37:40"
   },
   {
     "token": [
       "LIDENT",
       "f"
     ],
-    "loc": "38:23-38:24"
+    "loc": "37:41-37:42"
   },
   {
     "token": "LPAREN",
-    "loc": "38:24-38:25"
+    "loc": "37:42-37:43"
   },
   {
     "token": [
       "LIDENT",
       "id"
     ],
-    "loc": "38:25-38:27"
+    "loc": "37:43-37:45"
   },
   {
     "token": "RPAREN",
-    "loc": "38:27-38:28"
-  },
-  {
-    "token": "RBRACE",
-    "loc": "38:29-38:30"
+    "loc": "37:45-37:46"
   },
   {
     "token": "RPAREN",
-    "loc": "38:30-38:31"
-  },
-  {
-    "token": "NEWLINE",
-    "loc": "38:31-38:32"
-  },
-  {
-    "token": "RBRACE",
-    "loc": "39:3-39:4"
+    "loc": "37:46-37:47"
   },
   {
     "token": "RPAREN",
-    "loc": "39:4-39:5"
+    "loc": "37:47-37:48"
   },
   {
     "token": "NEWLINE",
-    "loc": "39:5-39:6"
+    "loc": "37:48-37:49"
   },
   {
     "token": "RBRACE",
-    "loc": "40:1-40:2"
+    "loc": "38:1-38:2"
   },
   {
     "token": [
       "SEMI",
       false
     ],
-    "loc": "40:2-40:2"
+    "loc": "38:2-38:2"
   },
   {
     "token": "NEWLINE",
-    "loc": "40:2-40:3"
+    "loc": "38:2-38:3"
   },
   {
     "token": "NEWLINE",
-    "loc": "41:1-41:2"
+    "loc": "39:1-39:2"
   },
   {
     "token": "FN",
-    "loc": "42:1-42:3"
+    "loc": "40:1-40:3"
   },
   {
     "token": [
       "UIDENT",
       "Scheduler"
     ],
-    "loc": "42:4-42:13"
+    "loc": "40:4-40:13"
   },
   {
     "token": "COLONCOLON",
-    "loc": "42:13-42:15"
+    "loc": "40:13-40:15"
   },
   {
     "token": [
       "LIDENT",
       "spawn"
     ],
-    "loc": "42:15-42:20"
+    "loc": "40:15-40:20"
   },
   {
     "token": "LPAREN",
-    "loc": "42:20-42:21"
+    "loc": "40:20-40:21"
   },
   {
     "token": [
       "LIDENT",
       "self"
     ],
-    "loc": "42:21-42:25"
+    "loc": "40:21-40:25"
   },
   {
     "token": "COLON",
-    "loc": "42:26-42:27"
+    "loc": "40:26-40:27"
   },
   {
     "token": [
       "UIDENT",
       "Scheduler"
     ],
-    "loc": "42:28-42:37"
+    "loc": "40:28-40:37"
   },
   {
     "token": "COMMA",
-    "loc": "42:37-42:38"
+    "loc": "40:37-40:38"
   },
   {
     "token": [
       "LIDENT",
       "f"
     ],
-    "loc": "42:39-42:40"
+    "loc": "40:39-40:40"
   },
   {
     "token": "COLON",
-    "loc": "42:41-42:42"
+    "loc": "40:41-40:42"
   },
   {
     "token": "ASYNC",
-    "loc": "42:43-42:48"
+    "loc": "40:43-40:48"
   },
   {
     "token": "LPAREN",
-    "loc": "42:49-42:50"
+    "loc": "40:49-40:50"
   },
   {
     "token": [
       "UIDENT",
       "Int"
     ],
-    "loc": "42:50-42:53"
+    "loc": "40:50-40:53"
   },
   {
     "token": "RPAREN",
-    "loc": "42:53-42:54"
+    "loc": "40:53-40:54"
   },
   {
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@@ -2436,907 +2388,907 @@
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     "token": "LPAREN",
-    "loc": "145:14-145:15"
+    "loc": "143:14-143:15"
   },
   {
     "token": [
       "INTERP",
       "\"thread \\{id}: sending 1 to channel 1\""
     ],
-    "loc": "145:15-145:53"
+    "loc": "143:15-143:53"
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   {
     "token": "RPAREN",
-    "loc": "145:53-145:54"
+    "loc": "143:53-143:54"
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   {
     "token": [
       "SEMI",
       false
     ],
-    "loc": "145:54-145:54"
+    "loc": "143:54-143:54"
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   {
     "token": "NEWLINE",
-    "loc": "145:54-145:55"
+    "loc": "143:54-143:55"
   },
   {
     "token": [
       "LIDENT",
       "c1"
     ],
-    "loc": "146:7-146:9"
+    "loc": "144:7-144:9"
   },
   {
     "token": [
       "DOT_LIDENT",
       "send"
     ],
-    "loc": "146:10-146:14"
+    "loc": "144:10-144:14"
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   {
     "token": "LPAREN",
-    "loc": "146:14-146:15"
+    "loc": "144:14-144:15"
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     "token": [
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       "1"
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-    "loc": "146:15-146:16"
+    "loc": "144:15-144:16"
   },
   {
     "token": "RPAREN",
-    "loc": "146:16-146:17"
+    "loc": "144:16-144:17"
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     "token": [
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-    "loc": "146:17-146:17"
+    "loc": "144:17-144:17"
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+    "loc": "144:17-144:18"
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     "token": [
       "LIDENT",
       "println"
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-    "loc": "147:7-147:14"
+    "loc": "145:7-145:14"
   },
   {
     "token": "LPAREN",
-    "loc": "147:14-147:15"
+    "loc": "145:14-145:15"
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   {
     "token": [
       "INTERP",
       "\"thread \\{id}: sending 2 to channel 2\""
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-    "loc": "147:15-147:53"
+    "loc": "145:15-145:53"
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-    "loc": "147:53-147:54"
+    "loc": "145:53-145:54"
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-    "loc": "147:54-147:55"
+    "loc": "145:54-145:55"
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   {
     "token": [
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       "c2"
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-    "loc": "148:7-148:9"
+    "loc": "146:7-146:9"
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   {
     "token": [
       "DOT_LIDENT",
       "send"
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-    "loc": "148:10-148:14"
+    "loc": "146:10-146:14"
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   {
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-    "loc": "148:14-148:15"
+    "loc": "146:14-146:15"
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   {
     "token": [
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       "2"
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-    "loc": "148:15-148:16"
+    "loc": "146:15-146:16"
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   {
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-    "loc": "148:16-148:17"
+    "loc": "146:16-146:17"
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     "token": [
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       false
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-    "loc": "148:17-148:17"
+    "loc": "146:17-146:17"
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   {
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-    "loc": "148:17-148:18"
+    "loc": "146:17-146:18"
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   {
     "token": [
       "LIDENT",
       "println"
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-    "loc": "149:7-149:14"
+    "loc": "147:7-147:14"
   },
   {
     "token": "LPAREN",
-    "loc": "149:14-149:15"
+    "loc": "147:14-147:15"
   },
   {
     "token": [
       "INTERP",
       "\"thread \\{id}: sending 3 to channel 2\""
     ],
-    "loc": "149:15-149:53"
+    "loc": "147:15-147:53"
   },
   {
     "token": "RPAREN",
-    "loc": "149:53-149:54"
+    "loc": "147:53-147:54"
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   {
     "token": [
       "SEMI",
       false
     ],
-    "loc": "149:54-149:54"
+    "loc": "147:54-147:54"
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   {
     "token": "NEWLINE",
-    "loc": "149:54-149:55"
+    "loc": "147:54-147:55"
   },
   {
     "token": [
       "LIDENT",
       "c2"
     ],
-    "loc": "150:7-150:9"
+    "loc": "148:7-148:9"
   },
   {
     "token": [
       "DOT_LIDENT",
       "send"
     ],
-    "loc": "150:10-150:14"
+    "loc": "148:10-148:14"
   },
   {
     "token": "LPAREN",
-    "loc": "150:14-150:15"
+    "loc": "148:14-148:15"
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   {
     "token": [
       "INT",
       "3"
     ],
-    "loc": "150:15-150:16"
+    "loc": "148:15-148:16"
   },
   {
     "token": "RPAREN",
-    "loc": "150:16-150:17"
+    "loc": "148:16-148:17"
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   {
     "token": [
       "SEMI",
       false
     ],
-    "loc": "150:17-150:17"
+    "loc": "148:17-148:17"
   },
   {
     "token": "NEWLINE",
-    "loc": "150:17-150:18"
+    "loc": "148:17-148:18"
   },
   {
     "token": [
       "LIDENT",
       "println"
     ],
-    "loc": "151:7-151:14"
+    "loc": "149:7-149:14"
   },
   {
     "token": "LPAREN",
-    "loc": "151:14-151:15"
+    "loc": "149:14-149:15"
   },
   {
     "token": [
       "INTERP",
       "\"thread \\{id}: sending 4 to channel 2\""
     ],
-    "loc": "151:15-151:53"
+    "loc": "149:15-149:53"
   },
   {
     "token": "RPAREN",
-    "loc": "151:53-151:54"
+    "loc": "149:53-149:54"
   },
   {
     "token": [
       "SEMI",
       false
     ],
-    "loc": "151:54-151:54"
+    "loc": "149:54-149:54"
   },
   {
     "token": "NEWLINE",
-    "loc": "151:54-151:55"
+    "loc": "149:54-149:55"
   },
   {
     "token": [
       "LIDENT",
       "c1"
     ],
-    "loc": "152:7-152:9"
+    "loc": "150:7-150:9"
   },
   {
     "token": [
       "DOT_LIDENT",
       "send"
     ],
-    "loc": "152:10-152:14"
+    "loc": "150:10-150:14"
   },
   {
     "token": "LPAREN",
-    "loc": "152:14-152:15"
+    "loc": "150:14-150:15"
   },
   {
     "token": [
       "INT",
       "4"
     ],
-    "loc": "152:15-152:16"
+    "loc": "150:15-150:16"
   },
   {
     "token": "RPAREN",
-    "loc": "152:16-152:17"
+    "loc": "150:16-150:17"
   },
   {
     "token": [
       "SEMI",
       false
     ],
-    "loc": "152:17-152:17"
+    "loc": "150:17-150:17"
   },
   {
     "token": "NEWLINE",
-    "loc": "152:17-152:18"
+    "loc": "150:17-150:18"
   },
   {
     "token": [
       "LIDENT",
       "println"
     ],
-    "loc": "153:7-153:14"
+    "loc": "151:7-151:14"
   },
   {
     "token": "LPAREN",
-    "loc": "153:14-153:15"
+    "loc": "151:14-151:15"
   },
   {
     "token": [
       "INTERP",
       "\"thread \\{id}: terminating channel 1\""
     ],
-    "loc": "153:15-153:52"
+    "loc": "151:15-151:52"
   },
   {
     "token": "RPAREN",
-    "loc": "153:52-153:53"
+    "loc": "151:52-151:53"
   },
   {
     "token": [
       "SEMI",
       false
     ],
-    "loc": "153:53-153:53"
+    "loc": "151:53-151:53"
   },
   {
     "token": "NEWLINE",
-    "loc": "153:53-153:54"
+    "loc": "151:53-151:54"
   },
   {
     "token": [
       "LIDENT",
       "c1"
     ],
-    "loc": "154:7-154:9"
+    "loc": "152:7-152:9"
   },
   {
     "token": [
       "DOT_LIDENT",
       "terminate"
     ],
-    "loc": "154:10-154:19"
+    "loc": "152:10-152:19"
   },
   {
     "token": "LPAREN",
-    "loc": "154:19-154:20"
+    "loc": "152:19-152:20"
   },
   {
     "token": "RPAREN",
-    "loc": "154:20-154:21"
+    "loc": "152:20-152:21"
   },
   {
     "token": [
       "SEMI",
       false
     ],
-    "loc": "154:21-154:21"
+    "loc": "152:21-152:21"
   },
   {
     "token": "NEWLINE",
-    "loc": "154:21-154:22"
+    "loc": "152:21-152:22"
   },
   {
     "token": [
       "LIDENT",
       "println"
     ],
-    "loc": "155:7-155:14"
+    "loc": "153:7-153:14"
   },
   {
     "token": "LPAREN",
-    "loc": "155:14-155:15"
+    "loc": "153:14-153:15"
   },
   {
     "token": [
       "INTERP",
       "\"thread \\{id}: terminating channel 2\""
     ],
-    "loc": "155:15-155:52"
+    "loc": "153:15-153:52"
   },
   {
     "token": "RPAREN",
-    "loc": "155:52-155:53"
+    "loc": "153:52-153:53"
   },
   {
     "token": [
       "SEMI",
       false
     ],
-    "loc": "155:53-155:53"
+    "loc": "153:53-153:53"
   },
   {
     "token": "NEWLINE",
-    "loc": "155:53-155:54"
+    "loc": "153:53-153:54"
   },
   {
     "token": [
       "LIDENT",
       "c2"
     ],
-    "loc": "156:7-156:9"
+    "loc": "154:7-154:9"
   },
   {
     "token": [
       "DOT_LIDENT",
       "terminate"
     ],
-    "loc": "156:10-156:19"
+    "loc": "154:10-154:19"
   },
   {
     "token": "LPAREN",
-    "loc": "156:19-156:20"
+    "loc": "154:19-154:20"
   },
   {
     "token": "RPAREN",
-    "loc": "156:20-156:21"
+    "loc": "154:20-154:21"
   },
   {
     "token": "NEWLINE",
-    "loc": "156:21-156:22"
+    "loc": "154:21-154:22"
   },
   {
     "token": "RBRACE",
-    "loc": "157:5-157:6"
+    "loc": "155:5-155:6"
   },
   {
     "token": "CATCH",
-    "loc": "157:7-157:12"
+    "loc": "155:7-155:12"
   },
   {
     "token": "LBRACE",
-    "loc": "157:13-157:14"
+    "loc": "155:13-155:14"
   },
   {
     "token": "NEWLINE",
-    "loc": "157:14-157:15"
+    "loc": "155:14-155:15"
   },
   {
     "token": [
       "UIDENT",
       "ChannelTerminated"
     ],
-    "loc": "158:7-158:24"
+    "loc": "156:7-156:24"
   },
   {
     "token": "FAT_ARROW",
-    "loc": "158:25-158:27"
+    "loc": "156:25-156:27"
   },
   {
     "token": [
       "LIDENT",
       "abort"
     ],
-    "loc": "158:28-158:33"
+    "loc": "156:28-156:33"
   },
   {
     "token": "LPAREN",
-    "loc": "158:33-158:34"
+    "loc": "156:33-156:34"
   },
   {
     "token": [
       "STRING",
       "unexpected termination of channel"
     ],
-    "loc": "158:34-158:69"
+    "loc": "156:34-156:69"
   },
   {
     "token": "RPAREN",
-    "loc": "158:69-158:70"
+    "loc": "156:69-156:70"
   },
   {
     "token": "NEWLINE",
-    "loc": "158:70-158:71"
+    "loc": "156:70-156:71"
   },
   {
     "token": "RBRACE",
-    "loc": "159:5-159:6"
+    "loc": "157:5-157:6"
   },
   {
     "token": "NEWLINE",
-    "loc": "159:6-159:7"
+    "loc": "157:6-157:7"
   },
   {
     "token": "RBRACE",
-    "loc": "160:3-160:4"
+    "loc": "158:3-158:4"
   },
   {
     "token": "RPAREN",
-    "loc": "160:4-160:5"
+    "loc": "158:4-158:5"
   },
   {
     "token": [
       "SEMI",
       false
     ],
-    "loc": "160:5-160:5"
+    "loc": "158:5-158:5"
   },
   {
     "token": "NEWLINE",
-    "loc": "160:5-160:6"
+    "loc": "158:5-158:6"
   },
   {
     "token": [
       "LIDENT",
       "ctx"
     ],
-    "loc": "161:3-161:6"
+    "loc": "159:3-159:6"
   },
   {
     "token": [
       "DOT_LIDENT",
       "run_all"
     ],
-    "loc": "161:7-161:14"
+    "loc": "159:7-159:14"
   },
   {
     "token": "LPAREN",
-    "loc": "161:14-161:15"
+    "loc": "159:14-159:15"
   },
   {
     "token": "RPAREN",
-    "loc": "161:15-161:16"
+    "loc": "159:15-159:16"
   },
   {
     "token": "NEWLINE",
-    "loc": "161:16-161:17"
+    "loc": "159:16-159:17"
   },
   {
     "token": "RBRACE",
-    "loc": "162:1-162:2"
+    "loc": "160:1-160:2"
   },
   {
     "token": [
       "SEMI",
       false
     ],
-    "loc": "162:2-162:2"
+    "loc": "160:2-160:2"
   },
   {
     "token": "NEWLINE",
-    "loc": "162:2-162:3"
+    "loc": "160:2-160:3"
   },
   {
     "token": "EOF",
-    "loc": "163:1-163:1"
+    "loc": "161:1-161:1"
   }
 ]
\ No newline at end of file
diff --git a/test/sync_test/__snapshot__/pipeline_test_coroutine_cancel.json b/test/sync_test/__snapshot__/pipeline_test_coroutine_cancel.json
index 7a663694..730acded 100644
--- a/test/sync_test/__snapshot__/pipeline_test_coroutine_cancel.json
+++ b/test/sync_test/__snapshot__/pipeline_test_coroutine_cancel.json
@@ -2583,126 +2583,93 @@
                                                         "children": []
                                                       },
                                                       "body": {
-                                                        "kind": "Expr::Try",
+                                                        "kind": "Expr::Group",
                                                         "loc": null,
                                                         "children": {
-                                                          "body": {
-                                                            "kind": "Expr::Apply",
+                                                          "expr": {
+                                                            "kind": "Expr::Try",
                                                             "loc": null,
                                                             "children": {
-                                                              "func": {
-                                                                "kind": "Expr::Ident",
+                                                              "body": {
+                                                                "kind": "Expr::Apply",
                                                                 "loc": null,
                                                                 "children": {
-                                                                  "id": {
-                                                                    "kind": "Var",
+                                                                  "func": {
+                                                                    "kind": "Expr::Ident",
                                                                     "loc": null,
                                                                     "children": {
-                                                                      "name": {
-                                                                        "kind": "LongIdent::Ident",
+                                                                      "id": {
+                                                                        "kind": "Var",
                                                                         "loc": null,
                                                                         "children": {
-                                                                          "value": "f"
+                                                                          "name": {
+                                                                            "kind": "LongIdent::Ident",
+                                                                            "loc": null,
+                                                                            "children": {
+                                                                              "value": "f"
+                                                                            }
+                                                                          }
                                                                         }
                                                                       }
                                                                     }
-                                                                  }
-                                                                }
-                                                              },
-                                                              "args": {
-                                                                "kind": "Expr::Apply::ArgumentList",
-                                                                "loc": null,
-                                                                "children": [
-                                                                  {
-                                                                    "kind": "Argument",
+                                                                  },
+                                                                  "args": {
+                                                                    "kind": "Expr::Apply::ArgumentList",
                                                                     "loc": null,
-                                                                    "children": {
-                                                                      "value": {
-                                                                        "kind": "Expr::Ident",
+                                                                    "children": [
+                                                                      {
+                                                                        "kind": "Argument",
                                                                         "loc": null,
                                                                         "children": {
-                                                                          "id": {
-                                                                            "kind": "Var",
+                                                                          "value": {
+                                                                            "kind": "Expr::Ident",
                                                                             "loc": null,
                                                                             "children": {
-                                                                              "name": {
-                                                                                "kind": "LongIdent::Ident",
+                                                                              "id": {
+                                                                                "kind": "Var",
                                                                                 "loc": null,
                                                                                 "children": {
-                                                                                  "value": "id"
+                                                                                  "name": {
+                                                                                    "kind": "LongIdent::Ident",
+                                                                                    "loc": null,
+                                                                                    "children": {
+                                                                                      "value": "id"
+                                                                                    }
+                                                                                  }
                                                                                 }
                                                                               }
                                                                             }
+                                                                          },
+                                                                          "kind": {
+                                                                            "kind": "ArgumentKind::Positional",
+                                                                            "loc": null,
+                                                                            "children": {}
                                                                           }
                                                                         }
-                                                                      },
-                                                                      "kind": {
-                                                                        "kind": "ArgumentKind::Positional",
-                                                                        "loc": null,
-                                                                        "children": {}
                                                                       }
-                                                                    }
+                                                                    ]
+                                                                  },
+                                                                  "attr": {
+                                                                    "kind": "ApplyAttr::NoAttr",
+                                                                    "loc": null,
+                                                                    "children": {}
                                                                   }
-                                                                ]
+                                                                }
                                                               },
-                                                              "attr": {
-                                                                "kind": "ApplyAttr::NoAttr",
-                                                                "loc": null,
-                                                                "children": {}
-                                                              }
-                                                            }
-                                                          },
-                                                          "catch": {
-                                                            "kind": "Expr::Try::CaseList",
-                                                            "loc": null,
-                                                            "children": [
-                                                              {
-                                                                "kind": "Case",
+                                                              "catch": {
+                                                                "kind": "Expr::Try::CaseList",
                                                                 "loc": null,
-                                                                "children": {
-                                                                  "pattern": {
-                                                                    "kind": "Pattern::Var",
-                                                                    "loc": null,
-                                                                    "children": {
-                                                                      "value": {
-                                                                        "kind": "Binder",
-                                                                        "loc": null,
-                                                                        "children": {
-                                                                          "name": "err"
-                                                                        }
-                                                                      }
-                                                                    }
-                                                                  },
-                                                                  "guard": null,
-                                                                  "body": {
-                                                                    "kind": "Expr::Mutate",
+                                                                "children": [
+                                                                  {
+                                                                    "kind": "Case",
                                                                     "loc": null,
                                                                     "children": {
-                                                                      "record": {
-                                                                        "kind": "Expr::Ident",
-                                                                        "loc": null,
-                                                                        "children": {
-                                                                          "id": {
-                                                                            "kind": "Var",
-                                                                            "loc": null,
-                                                                            "children": {
-                                                                              "name": {
-                                                                                "kind": "LongIdent::Ident",
-                                                                                "loc": null,
-                                                                                "children": {
-                                                                                  "value": "self"
-                                                                                }
-                                                                              }
-                                                                            }
-                                                                          }
-                                                                        }
-                                                                      },
-                                                                      "accessor": {
-                                                                        "kind": "Accessor::Label",
+                                                                      "pattern": {
+                                                                        "kind": "Pattern::Var",
                                                                         "loc": null,
                                                                         "children": {
                                                                           "value": {
-                                                                            "kind": "Label",
+                                                                            "kind": "Binder",
                                                                             "loc": null,
                                                                             "children": {
                                                                               "name": "err"
@@ -2710,87 +2677,131 @@
                                                                           }
                                                                         }
                                                                       },
-                                                                      "field": {
-                                                                        "kind": "Expr::Apply",
+                                                                      "guard": null,
+                                                                      "body": {
+                                                                        "kind": "Expr::Mutate",
                                                                         "loc": null,
                                                                         "children": {
-                                                                          "func": {
-                                                                            "kind": "Expr::Constr",
+                                                                          "record": {
+                                                                            "kind": "Expr::Ident",
                                                                             "loc": null,
                                                                             "children": {
-                                                                              "constr": {
-                                                                                "kind": "Constructor",
+                                                                              "id": {
+                                                                                "kind": "Var",
                                                                                 "loc": null,
                                                                                 "children": {
                                                                                   "name": {
-                                                                                    "kind": "ConstrName",
+                                                                                    "kind": "LongIdent::Ident",
                                                                                     "loc": null,
                                                                                     "children": {
-                                                                                      "name": "Some"
+                                                                                      "value": "self"
                                                                                     }
-                                                                                  },
-                                                                                  "extra_info": {
-                                                                                    "kind": "ConstructorExtraInfo::NoExtraInfo",
-                                                                                    "loc": null,
-                                                                                    "children": {}
                                                                                   }
                                                                                 }
                                                                               }
                                                                             }
                                                                           },
-                                                                          "args": {
-                                                                            "kind": "Expr::Apply::ArgumentList",
+                                                                          "accessor": {
+                                                                            "kind": "Accessor::Label",
                                                                             "loc": null,
-                                                                            "children": [
-                                                                              {
-                                                                                "kind": "Argument",
+                                                                            "children": {
+                                                                              "value": {
+                                                                                "kind": "Label",
                                                                                 "loc": null,
                                                                                 "children": {
-                                                                                  "value": {
-                                                                                    "kind": "Expr::Ident",
+                                                                                  "name": "err"
+                                                                                }
+                                                                              }
+                                                                            }
+                                                                          },
+                                                                          "field": {
+                                                                            "kind": "Expr::Apply",
+                                                                            "loc": null,
+                                                                            "children": {
+                                                                              "func": {
+                                                                                "kind": "Expr::Constr",
+                                                                                "loc": null,
+                                                                                "children": {
+                                                                                  "constr": {
+                                                                                    "kind": "Constructor",
                                                                                     "loc": null,
                                                                                     "children": {
-                                                                                      "id": {
-                                                                                        "kind": "Var",
+                                                                                      "name": {
+                                                                                        "kind": "ConstrName",
                                                                                         "loc": null,
                                                                                         "children": {
-                                                                                          "name": {
-                                                                                            "kind": "LongIdent::Ident",
+                                                                                          "name": "Some"
+                                                                                        }
+                                                                                      },
+                                                                                      "extra_info": {
+                                                                                        "kind": "ConstructorExtraInfo::NoExtraInfo",
+                                                                                        "loc": null,
+                                                                                        "children": {}
+                                                                                      }
+                                                                                    }
+                                                                                  }
+                                                                                }
+                                                                              },
+                                                                              "args": {
+                                                                                "kind": "Expr::Apply::ArgumentList",
+                                                                                "loc": null,
+                                                                                "children": [
+                                                                                  {
+                                                                                    "kind": "Argument",
+                                                                                    "loc": null,
+                                                                                    "children": {
+                                                                                      "value": {
+                                                                                        "kind": "Expr::Ident",
+                                                                                        "loc": null,
+                                                                                        "children": {
+                                                                                          "id": {
+                                                                                            "kind": "Var",
                                                                                             "loc": null,
                                                                                             "children": {
-                                                                                              "value": "err"
+                                                                                              "name": {
+                                                                                                "kind": "LongIdent::Ident",
+                                                                                                "loc": null,
+                                                                                                "children": {
+                                                                                                  "value": "err"
+                                                                                                }
+                                                                                              }
                                                                                             }
                                                                                           }
                                                                                         }
+                                                                                      },
+                                                                                      "kind": {
+                                                                                        "kind": "ArgumentKind::Positional",
+                                                                                        "loc": null,
+                                                                                        "children": {}
                                                                                       }
                                                                                     }
-                                                                                  },
-                                                                                  "kind": {
-                                                                                    "kind": "ArgumentKind::Positional",
-                                                                                    "loc": null,
-                                                                                    "children": {}
                                                                                   }
-                                                                                }
+                                                                                ]
+                                                                              },
+                                                                              "attr": {
+                                                                                "kind": "ApplyAttr::NoAttr",
+                                                                                "loc": null,
+                                                                                "children": {}
                                                                               }
-                                                                            ]
+                                                                            }
                                                                           },
-                                                                          "attr": {
-                                                                            "kind": "ApplyAttr::NoAttr",
-                                                                            "loc": null,
-                                                                            "children": {}
-                                                                          }
+                                                                          "augmented_by": null
                                                                         }
-                                                                      },
-                                                                      "augmented_by": null
+                                                                      }
                                                                     }
                                                                   }
-                                                                }
-                                                              }
-                                                            ]
+                                                                ]
+                                                              },
+                                                              "catch_all": false,
+                                                              "try_else": null,
+                                                              "has_try": true
+                                                            }
                                                           },
-                                                          "catch_all": false,
-                                                          "try_else": null,
-                                                          "has_try": true
+                                                          "group": {
+                                                            "kind": "Group::Brace",
+                                                            "loc": null,
+                                                            "children": {}
+                                                          }
                                                         }
                                                       },
                                                       "return_type": null,
@@ -2800,7 +2811,7 @@
                                                         "children": {}
                                                       },
                                                       "kind": {
-                                                        "kind": "FnKind::Lambda",
+                                                        "kind": "FnKind::Arrow",
                                                         "loc": null,
                                                         "children": {}
                                                       },
diff --git a/test/sync_test/__snapshot__/pipeline_test_coroutine_cancel.mbt b/test/sync_test/__snapshot__/pipeline_test_coroutine_cancel.mbt
index e8561415..a7508362 100644
--- a/test/sync_test/__snapshot__/pipeline_test_coroutine_cancel.mbt
+++ b/test/sync_test/__snapshot__/pipeline_test_coroutine_cancel.mbt
@@ -43,7 +43,7 @@ fn Scheduler::spawn(self : Scheduler, f : async (Int) -> Unit raise) -> Unit {
   let id = self.next_id
   self.next_id += 1
   fn ok() {
-    run_async(fn () {
+    run_async(() => {
       try f(id) catch {
         err => self.err = Some(err)
       }
diff --git a/test/sync_test/__snapshot__/pipeline_test_coroutine_cancel.mbt.tokens.json b/test/sync_test/__snapshot__/pipeline_test_coroutine_cancel.mbt.tokens.json
index e0d17b54..927525fc 100644
--- a/test/sync_test/__snapshot__/pipeline_test_coroutine_cancel.mbt.tokens.json
+++ b/test/sync_test/__snapshot__/pipeline_test_coroutine_cancel.mbt.tokens.json
@@ -1561,17 +1561,17 @@
     "token": "LPAREN",
     "loc": "46:14-46:15"
   },
-  {
-    "token": "FN",
-    "loc": "46:15-46:17"
-  },
   {
     "token": "LPAREN",
-    "loc": "46:18-46:19"
+    "loc": "46:15-46:16"
   },
   {
     "token": "RPAREN",
-    "loc": "46:19-46:20"
+    "loc": "46:16-46:17"
+  },
+  {
+    "token": "FAT_ARROW",
+    "loc": "46:18-46:20"
   },
   {
     "token": "LBRACE",
diff --git a/test/sync_test/__snapshot__/pipeline_test_error_enum_match.json b/test/sync_test/__snapshot__/pipeline_test_error_enum_match.json
new file mode 100644
index 00000000..a7c4a456
--- /dev/null
+++ b/test/sync_test/__snapshot__/pipeline_test_error_enum_match.json
@@ -0,0 +1,1541 @@
+[
+  {
+    "kind": "Impl::TopTypeDef",
+    "loc": null,
+    "children": {
+      "value": {
+        "kind": "TypeDecl",
+        "loc": null,
+        "children": {
+          "tycon": "DemoError",
+          "params": {
+            "kind": "TypeDecl::ParamList",
+            "loc": null,
+            "children": []
+          },
+          "components": {
+            "kind": "TypeDesc::Error",
+            "loc": null,
+            "children": {
+              "value": {
+                "kind": "ExceptionDecl::EnumPayload",
+                "loc": null,
+                "children": {
+                  "value": {
+                    "kind": "ExceptionDecl::EnumPayload::ConstrList",
+                    "loc": null,
+                    "children": [
+                      {
+                        "kind": "ConstrDecl",
+                        "loc": null,
+                        "children": {
+                          "name": {
+                            "kind": "ConstrName",
+                            "loc": null,
+                            "children": {
+                              "name": "InvalidChar"
+                            }
+                          },
+                          "args": {
+                            "kind": "ConstrDecl::ArgList",
+                            "loc": null,
+                            "children": [
+                              {
+                                "kind": "ConstrParam",
+                                "loc": null,
+                                "children": {
+                                  "ty": {
+                                    "kind": "Type::Name",
+                                    "loc": null,
+                                    "children": {
+                                      "constr_id": {
+                                        "kind": "ConstrId",
+                                        "loc": null,
+                                        "children": {
+                                          "id": {
+                                            "kind": "LongIdent::Ident",
+                                            "loc": null,
+                                            "children": {
+                                              "value": "Pos"
+                                            }
+                                          }
+                                        }
+                                      },
+                                      "tys": {
+                                        "kind": "Type::Name::TypeList",
+                                        "loc": null,
+                                        "children": []
+                                      }
+                                    }
+                                  },
+                                  "mut": false,
+                                  "label": null
+                                }
+                              },
+                              {
+                                "kind": "ConstrParam",
+                                "loc": null,
+                                "children": {
+                                  "ty": {
+                                    "kind": "Type::Name",
+                                    "loc": null,
+                                    "children": {
+                                      "constr_id": {
+                                        "kind": "ConstrId",
+                                        "loc": null,
+                                        "children": {
+                                          "id": {
+                                            "kind": "LongIdent::Ident",
+                                            "loc": null,
+                                            "children": {
+                                              "value": "Char"
+                                            }
+                                          }
+                                        }
+                                      },
+                                      "tys": {
+                                        "kind": "Type::Name::TypeList",
+                                        "loc": null,
+                                        "children": []
+                                      }
+                                    }
+                                  },
+                                  "mut": false,
+                                  "label": null
+                                }
+                              }
+                            ]
+                          },
+                          "tag": null,
+                          "attrs": {
+                            "kind": "ConstrDecl::AttrList",
+                            "loc": null,
+                            "children": []
+                          },
+                          "doc": ""
+                        }
+                      }
+                    ]
+                  }
+                }
+              }
+            }
+          },
+          "attrs": {
+            "kind": "TypeDecl::AttrList",
+            "loc": null,
+            "children": []
+          },
+          "doc": "",
+          "type_vis": {
+            "kind": "Visibility::Default",
+            "loc": null,
+            "children": {}
+          },
+          "is_declare": false,
+          "deriving": {
+            "kind": "TypeDecl::DerivingList",
+            "loc": null,
+            "children": []
+          }
+        }
+      }
+    }
+  },
+  {
+    "kind": "Impl::TopTypeDef",
+    "loc": null,
+    "children": {
+      "value": {
+        "kind": "TypeDecl",
+        "loc": null,
+        "children": {
+          "tycon": "Pos",
+          "params": {
+            "kind": "TypeDecl::ParamList",
+            "loc": null,
+            "children": []
+          },
+          "components": {
+            "kind": "TypeDesc::Record",
+            "loc": null,
+            "children": {
+              "value": {
+                "kind": "TypeDesc::Record::FieldList",
+                "loc": null,
+                "children": [
+                  {
+                    "kind": "FieldDecl",
+                    "loc": null,
+                    "children": {
+                      "name": {
+                        "kind": "FieldName",
+                        "loc": null,
+                        "children": {
+                          "label": "x"
+                        }
+                      },
+                      "ty": {
+                        "kind": "Type::Name",
+                        "loc": null,
+                        "children": {
+                          "constr_id": {
+                            "kind": "ConstrId",
+                            "loc": null,
+                            "children": {
+                              "id": {
+                                "kind": "LongIdent::Ident",
+                                "loc": null,
+                                "children": {
+                                  "value": "Int"
+                                }
+                              }
+                            }
+                          },
+                          "tys": {
+                            "kind": "Type::Name::TypeList",
+                            "loc": null,
+                            "children": []
+                          }
+                        }
+                      },
+                      "mut": false,
+                      "vis": {
+                        "kind": "Visibility::Default",
+                        "loc": null,
+                        "children": {}
+                      },
+                      "attrs": {
+                        "kind": "FieldDecl::AttrList",
+                        "loc": null,
+                        "children": []
+                      },
+                      "doc": ""
+                    }
+                  }
+                ]
+              }
+            }
+          },
+          "attrs": {
+            "kind": "TypeDecl::AttrList",
+            "loc": null,
+            "children": []
+          },
+          "doc": "",
+          "type_vis": {
+            "kind": "Visibility::Default",
+            "loc": null,
+            "children": {}
+          },
+          "is_declare": false,
+          "deriving": {
+            "kind": "TypeDecl::DerivingList",
+            "loc": null,
+            "children": []
+          }
+        }
+      }
+    }
+  },
+  {
+    "kind": "Impl::TopFuncDef",
+    "loc": null,
+    "children": {
+      "fun_decl": {
+        "kind": "FunDecl",
+        "loc": null,
+        "children": {
+          "type_name": null,
+          "name": {
+            "kind": "Binder",
+            "loc": null,
+            "children": {
+              "name": "foo"
+            }
+          },
+          "has_error": null,
+          "is_async": null,
+          "decl_params": {
+            "kind": "FunDecl::ParameterList",
+            "loc": null,
+            "children": []
+          },
+          "quantifiers": {
+            "kind": "FunDecl::QuantifierList",
+            "loc": null,
+            "children": []
+          },
+          "return_type": {
+            "kind": "Type::Name",
+            "loc": null,
+            "children": {
+              "constr_id": {
+                "kind": "ConstrId",
+                "loc": null,
+                "children": {
+                  "id": {
+                    "kind": "LongIdent::Ident",
+                    "loc": null,
+                    "children": {
+                      "value": "Int"
+                    }
+                  }
+                }
+              },
+              "tys": {
+                "kind": "Type::Name::TypeList",
+                "loc": null,
+                "children": []
+              }
+            }
+          },
+          "error_type": {
+            "kind": "ErrorType::DefaultErrorType",
+            "loc": null,
+            "children": {}
+          },
+          "vis": {
+            "kind": "Visibility::Default",
+            "loc": null,
+            "children": {}
+          },
+          "attrs": {
+            "kind": "FunDecl::AttrList",
+            "loc": null,
+            "children": []
+          },
+          "doc": ""
+        }
+      },
+      "decl_body": {
+        "kind": "DeclBody::DeclBody",
+        "loc": null,
+        "children": {
+          "local_types": {
+            "kind": "DeclBody::DeclBody::LocalTypeList",
+            "loc": null,
+            "children": []
+          },
+          "expr": {
+            "kind": "Expr::Raise",
+            "loc": null,
+            "children": {
+              "err_value": {
+                "kind": "Expr::Apply",
+                "loc": null,
+                "children": {
+                  "func": {
+                    "kind": "Expr::Constr",
+                    "loc": null,
+                    "children": {
+                      "constr": {
+                        "kind": "Constructor",
+                        "loc": null,
+                        "children": {
+                          "name": {
+                            "kind": "ConstrName",
+                            "loc": null,
+                            "children": {
+                              "name": "InvalidChar"
+                            }
+                          },
+                          "extra_info": {
+                            "kind": "ConstructorExtraInfo::TypeName",
+                            "loc": null,
+                            "children": {
+                              "value": {
+                                "kind": "TypeName",
+                                "loc": null,
+                                "children": {
+                                  "name": {
+                                    "kind": "LongIdent::Ident",
+                                    "loc": null,
+                                    "children": {
+                                      "value": "DemoError"
+                                    }
+                                  },
+                                  "is_object": false
+                                }
+                              }
+                            }
+                          }
+                        }
+                      }
+                    }
+                  },
+                  "args": {
+                    "kind": "Expr::Apply::ArgumentList",
+                    "loc": null,
+                    "children": [
+                      {
+                        "kind": "Argument",
+                        "loc": null,
+                        "children": {
+                          "value": {
+                            "kind": "Expr::Record",
+                            "loc": null,
+                            "children": {
+                              "type_name": null,
+                              "fields": {
+                                "kind": "Expr::Record::FieldList",
+                                "loc": null,
+                                "children": [
+                                  {
+                                    "kind": "FieldDef",
+                                    "loc": null,
+                                    "children": {
+                                      "label": {
+                                        "kind": "Label",
+                                        "loc": null,
+                                        "children": {
+                                          "name": "x"
+                                        }
+                                      },
+                                      "expr": {
+                                        "kind": "Expr::Constant",
+                                        "loc": null,
+                                        "children": {
+                                          "constant": {
+                                            "kind": "Constant::Int",
+                                            "loc": null,
+                                            "children": {
+                                              "value": "1"
+                                            }
+                                          }
+                                        }
+                                      },
+                                      "is_pun": false
+                                    }
+                                  }
+                                ]
+                              },
+                              "trailing": {
+                                "kind": "Trailing::None",
+                                "loc": null,
+                                "children": {}
+                              }
+                            }
+                          },
+                          "kind": {
+                            "kind": "ArgumentKind::Positional",
+                            "loc": null,
+                            "children": {}
+                          }
+                        }
+                      },
+                      {
+                        "kind": "Argument",
+                        "loc": null,
+                        "children": {
+                          "value": {
+                            "kind": "Expr::Constant",
+                            "loc": null,
+                            "children": {
+                              "constant": {
+                                "kind": "Constant::Char",
+                                "loc": null,
+                                "children": {
+                                  "value": "a"
+                                }
+                              }
+                            }
+                          },
+                          "kind": {
+                            "kind": "ArgumentKind::Positional",
+                            "loc": null,
+                            "children": {}
+                          }
+                        }
+                      }
+                    ]
+                  },
+                  "attr": {
+                    "kind": "ApplyAttr::NoAttr",
+                    "loc": null,
+                    "children": {}
+                  }
+                }
+              }
+            }
+          }
+        }
+      }
+    }
+  },
+  {
+    "kind": "Impl::TopFuncDef",
+    "loc": null,
+    "children": {
+      "fun_decl": {
+        "kind": "FunDecl",
+        "loc": null,
+        "children": {
+          "type_name": null,
+          "name": {
+            "kind": "Binder",
+            "loc": null,
+            "children": {
+              "name": "init"
+            }
+          },
+          "has_error": null,
+          "is_async": null,
+          "decl_params": null,
+          "quantifiers": {
+            "kind": "FunDecl::QuantifierList",
+            "loc": null,
+            "children": []
+          },
+          "return_type": null,
+          "error_type": {
+            "kind": "ErrorType::NoErrorType",
+            "loc": null,
+            "children": {}
+          },
+          "vis": {
+            "kind": "Visibility::Default",
+            "loc": null,
+            "children": {}
+          },
+          "attrs": {
+            "kind": "FunDecl::AttrList",
+            "loc": null,
+            "children": []
+          },
+          "doc": ""
+        }
+      },
+      "decl_body": {
+        "kind": "DeclBody::DeclBody",
+        "loc": null,
+        "children": {
+          "local_types": {
+            "kind": "DeclBody::DeclBody::LocalTypeList",
+            "loc": null,
+            "children": []
+          },
+          "expr": {
+            "kind": "Expr::Try",
+            "loc": null,
+            "children": {
+              "body": {
+                "kind": "Expr::Apply",
+                "loc": null,
+                "children": {
+                  "func": {
+                    "kind": "Expr::Ident",
+                    "loc": null,
+                    "children": {
+                      "id": {
+                        "kind": "Var",
+                        "loc": null,
+                        "children": {
+                          "name": {
+                            "kind": "LongIdent::Ident",
+                            "loc": null,
+                            "children": {
+                              "value": "foo"
+                            }
+                          }
+                        }
+                      }
+                    }
+                  },
+                  "args": {
+                    "kind": "Expr::Apply::ArgumentList",
+                    "loc": null,
+                    "children": []
+                  },
+                  "attr": {
+                    "kind": "ApplyAttr::NoAttr",
+                    "loc": null,
+                    "children": {}
+                  }
+                }
+              },
+              "catch": {
+                "kind": "Expr::Try::CaseList",
+                "loc": null,
+                "children": [
+                  {
+                    "kind": "Case",
+                    "loc": null,
+                    "children": {
+                      "pattern": {
+                        "kind": "Pattern::Constr",
+                        "loc": null,
+                        "children": {
+                          "constr": {
+                            "kind": "Constructor",
+                            "loc": null,
+                            "children": {
+                              "name": {
+                                "kind": "ConstrName",
+                                "loc": null,
+                                "children": {
+                                  "name": "InvalidChar"
+                                }
+                              },
+                              "extra_info": {
+                                "kind": "ConstructorExtraInfo::TypeName",
+                                "loc": null,
+                                "children": {
+                                  "value": {
+                                    "kind": "TypeName",
+                                    "loc": null,
+                                    "children": {
+                                      "name": {
+                                        "kind": "LongIdent::Ident",
+                                        "loc": null,
+                                        "children": {
+                                          "value": "DemoError"
+                                        }
+                                      },
+                                      "is_object": false
+                                    }
+                                  }
+                                }
+                              }
+                            }
+                          },
+                          "args": {
+                            "kind": "Pattern::Constr::ArgList",
+                            "loc": null,
+                            "children": [
+                              {
+                                "kind": "ConstrPatArg",
+                                "loc": null,
+                                "children": {
+                                  "pat": {
+                                    "kind": "Pattern::Var",
+                                    "loc": null,
+                                    "children": {
+                                      "value": {
+                                        "kind": "Binder",
+                                        "loc": null,
+                                        "children": {
+                                          "name": "pos"
+                                        }
+                                      }
+                                    }
+                                  },
+                                  "kind": {
+                                    "kind": "ArgumentKind::Positional",
+                                    "loc": null,
+                                    "children": {}
+                                  }
+                                }
+                              },
+                              {
+                                "kind": "ConstrPatArg",
+                                "loc": null,
+                                "children": {
+                                  "pat": {
+                                    "kind": "Pattern::Var",
+                                    "loc": null,
+                                    "children": {
+                                      "value": {
+                                        "kind": "Binder",
+                                        "loc": null,
+                                        "children": {
+                                          "name": "ch"
+                                        }
+                                      }
+                                    }
+                                  },
+                                  "kind": {
+                                    "kind": "ArgumentKind::Positional",
+                                    "loc": null,
+                                    "children": {}
+                                  }
+                                }
+                              }
+                            ]
+                          },
+                          "is_open": false
+                        }
+                      },
+                      "guard": null,
+                      "body": {
+                        "kind": "Expr::Apply",
+                        "loc": null,
+                        "children": {
+                          "func": {
+                            "kind": "Expr::Ident",
+                            "loc": null,
+                            "children": {
+                              "id": {
+                                "kind": "Var",
+                                "loc": null,
+                                "children": {
+                                  "name": {
+                                    "kind": "LongIdent::Ident",
+                                    "loc": null,
+                                    "children": {
+                                      "value": "println"
+                                    }
+                                  }
+                                }
+                              }
+                            }
+                          },
+                          "args": {
+                            "kind": "Expr::Apply::ArgumentList",
+                            "loc": null,
+                            "children": [
+                              {
+                                "kind": "Argument",
+                                "loc": null,
+                                "children": {
+                                  "value": {
+                                    "kind": "Expr::Interp",
+                                    "loc": null,
+                                    "children": {
+                                      "elems": {
+                                        "kind": "Expr::Interp::ElemList",
+                                        "loc": null,
+                                        "children": [
+                                          {
+                                            "kind": "InterpElem::Literal",
+                                            "loc": null,
+                                            "children": {
+                                              "repr": "invalid char at "
+                                            }
+                                          },
+                                          {
+                                            "kind": "InterpElem::Source",
+                                            "loc": null,
+                                            "children": {
+                                              "source": "pos.x"
+                                            }
+                                          },
+                                          {
+                                            "kind": "InterpElem::Literal",
+                                            "loc": null,
+                                            "children": {
+                                              "repr": ": "
+                                            }
+                                          },
+                                          {
+                                            "kind": "InterpElem::Source",
+                                            "loc": null,
+                                            "children": {
+                                              "source": "ch"
+                                            }
+                                          }
+                                        ]
+                                      }
+                                    }
+                                  },
+                                  "kind": {
+                                    "kind": "ArgumentKind::Positional",
+                                    "loc": null,
+                                    "children": {}
+                                  }
+                                }
+                              }
+                            ]
+                          },
+                          "attr": {
+                            "kind": "ApplyAttr::NoAttr",
+                            "loc": null,
+                            "children": {}
+                          }
+                        }
+                      }
+                    }
+                  },
+                  {
+                    "kind": "Case",
+                    "loc": null,
+                    "children": {
+                      "pattern": {
+                        "kind": "Pattern::Any",
+                        "loc": null,
+                        "children": {}
+                      },
+                      "guard": null,
+                      "body": {
+                        "kind": "Expr::Apply",
+                        "loc": null,
+                        "children": {
+                          "func": {
+                            "kind": "Expr::Ident",
+                            "loc": null,
+                            "children": {
+                              "id": {
+                                "kind": "Var",
+                                "loc": null,
+                                "children": {
+                                  "name": {
+                                    "kind": "LongIdent::Ident",
+                                    "loc": null,
+                                    "children": {
+                                      "value": "println"
+                                    }
+                                  }
+                                }
+                              }
+                            }
+                          },
+                          "args": {
+                            "kind": "Expr::Apply::ArgumentList",
+                            "loc": null,
+                            "children": [
+                              {
+                                "kind": "Argument",
+                                "loc": null,
+                                "children": {
+                                  "value": {
+                                    "kind": "Expr::Constant",
+                                    "loc": null,
+                                    "children": {
+                                      "constant": {
+                                        "kind": "Constant::String",
+                                        "loc": null,
+                                        "children": {
+                                          "value": "unknown error"
+                                        }
+                                      }
+                                    }
+                                  },
+                                  "kind": {
+                                    "kind": "ArgumentKind::Positional",
+                                    "loc": null,
+                                    "children": {}
+                                  }
+                                }
+                              }
+                            ]
+                          },
+                          "attr": {
+                            "kind": "ApplyAttr::NoAttr",
+                            "loc": null,
+                            "children": {}
+                          }
+                        }
+                      }
+                    }
+                  }
+                ]
+              },
+              "catch_all": false,
+              "try_else": {
+                "kind": "Expr::Try::CaseList",
+                "loc": null,
+                "children": [
+                  {
+                    "kind": "Case",
+                    "loc": null,
+                    "children": {
+                      "pattern": {
+                        "kind": "Pattern::Any",
+                        "loc": null,
+                        "children": {}
+                      },
+                      "guard": null,
+                      "body": {
+                        "kind": "Expr::Apply",
+                        "loc": null,
+                        "children": {
+                          "func": {
+                            "kind": "Expr::Ident",
+                            "loc": null,
+                            "children": {
+                              "id": {
+                                "kind": "Var",
+                                "loc": null,
+                                "children": {
+                                  "name": {
+                                    "kind": "LongIdent::Ident",
+                                    "loc": null,
+                                    "children": {
+                                      "value": "println"
+                                    }
+                                  }
+                                }
+                              }
+                            }
+                          },
+                          "args": {
+                            "kind": "Expr::Apply::ArgumentList",
+                            "loc": null,
+                            "children": [
+                              {
+                                "kind": "Argument",
+                                "loc": null,
+                                "children": {
+                                  "value": {
+                                    "kind": "Expr::Constant",
+                                    "loc": null,
+                                    "children": {
+                                      "constant": {
+                                        "kind": "Constant::String",
+                                        "loc": null,
+                                        "children": {
+                                          "value": "ok"
+                                        }
+                                      }
+                                    }
+                                  },
+                                  "kind": {
+                                    "kind": "ArgumentKind::Positional",
+                                    "loc": null,
+                                    "children": {}
+                                  }
+                                }
+                              }
+                            ]
+                          },
+                          "attr": {
+                            "kind": "ApplyAttr::NoAttr",
+                            "loc": null,
+                            "children": {}
+                          }
+                        }
+                      }
+                    }
+                  }
+                ]
+              },
+              "has_try": true
+            }
+          }
+        }
+      }
+    }
+  },
+  {
+    "kind": "Impl::TopTypeDef",
+    "loc": null,
+    "children": {
+      "value": {
+        "kind": "TypeDecl",
+        "loc": null,
+        "children": {
+          "tycon": "MultiError",
+          "params": {
+            "kind": "TypeDecl::ParamList",
+            "loc": null,
+            "children": []
+          },
+          "components": {
+            "kind": "TypeDesc::Error",
+            "loc": null,
+            "children": {
+              "value": {
+                "kind": "ExceptionDecl::EnumPayload",
+                "loc": null,
+                "children": {
+                  "value": {
+                    "kind": "ExceptionDecl::EnumPayload::ConstrList",
+                    "loc": null,
+                    "children": [
+                      {
+                        "kind": "ConstrDecl",
+                        "loc": null,
+                        "children": {
+                          "name": {
+                            "kind": "ConstrName",
+                            "loc": null,
+                            "children": {
+                              "name": "E"
+                            }
+                          },
+                          "args": {
+                            "kind": "ConstrDecl::ArgList",
+                            "loc": null,
+                            "children": [
+                              {
+                                "kind": "ConstrParam",
+                                "loc": null,
+                                "children": {
+                                  "ty": {
+                                    "kind": "Type::Name",
+                                    "loc": null,
+                                    "children": {
+                                      "constr_id": {
+                                        "kind": "ConstrId",
+                                        "loc": null,
+                                        "children": {
+                                          "id": {
+                                            "kind": "LongIdent::Ident",
+                                            "loc": null,
+                                            "children": {
+                                              "value": "Int"
+                                            }
+                                          }
+                                        }
+                                      },
+                                      "tys": {
+                                        "kind": "Type::Name::TypeList",
+                                        "loc": null,
+                                        "children": []
+                                      }
+                                    }
+                                  },
+                                  "mut": false,
+                                  "label": null
+                                }
+                              },
+                              {
+                                "kind": "ConstrParam",
+                                "loc": null,
+                                "children": {
+                                  "ty": {
+                                    "kind": "Type::Name",
+                                    "loc": null,
+                                    "children": {
+                                      "constr_id": {
+                                        "kind": "ConstrId",
+                                        "loc": null,
+                                        "children": {
+                                          "id": {
+                                            "kind": "LongIdent::Ident",
+                                            "loc": null,
+                                            "children": {
+                                              "value": "Double"
+                                            }
+                                          }
+                                        }
+                                      },
+                                      "tys": {
+                                        "kind": "Type::Name::TypeList",
+                                        "loc": null,
+                                        "children": []
+                                      }
+                                    }
+                                  },
+                                  "mut": false,
+                                  "label": null
+                                }
+                              }
+                            ]
+                          },
+                          "tag": null,
+                          "attrs": {
+                            "kind": "ConstrDecl::AttrList",
+                            "loc": null,
+                            "children": []
+                          },
+                          "doc": ""
+                        }
+                      }
+                    ]
+                  }
+                }
+              }
+            }
+          },
+          "attrs": {
+            "kind": "TypeDecl::AttrList",
+            "loc": null,
+            "children": []
+          },
+          "doc": "",
+          "type_vis": {
+            "kind": "Visibility::Default",
+            "loc": null,
+            "children": {}
+          },
+          "is_declare": false,
+          "deriving": {
+            "kind": "TypeDecl::DerivingList",
+            "loc": null,
+            "children": []
+          }
+        }
+      }
+    }
+  },
+  {
+    "kind": "Impl::TopFuncDef",
+    "loc": null,
+    "children": {
+      "fun_decl": {
+        "kind": "FunDecl",
+        "loc": null,
+        "children": {
+          "type_name": null,
+          "name": {
+            "kind": "Binder",
+            "loc": null,
+            "children": {
+              "name": "bar"
+            }
+          },
+          "has_error": null,
+          "is_async": null,
+          "decl_params": {
+            "kind": "FunDecl::ParameterList",
+            "loc": null,
+            "children": []
+          },
+          "quantifiers": {
+            "kind": "FunDecl::QuantifierList",
+            "loc": null,
+            "children": []
+          },
+          "return_type": {
+            "kind": "Type::Name",
+            "loc": null,
+            "children": {
+              "constr_id": {
+                "kind": "ConstrId",
+                "loc": null,
+                "children": {
+                  "id": {
+                    "kind": "LongIdent::Ident",
+                    "loc": null,
+                    "children": {
+                      "value": "Unit"
+                    }
+                  }
+                }
+              },
+              "tys": {
+                "kind": "Type::Name::TypeList",
+                "loc": null,
+                "children": []
+              }
+            }
+          },
+          "error_type": {
+            "kind": "ErrorType::ErrorType",
+            "loc": null,
+            "children": {
+              "ty": {
+                "kind": "Type::Name",
+                "loc": null,
+                "children": {
+                  "constr_id": {
+                    "kind": "ConstrId",
+                    "loc": null,
+                    "children": {
+                      "id": {
+                        "kind": "LongIdent::Ident",
+                        "loc": null,
+                        "children": {
+                          "value": "MultiError"
+                        }
+                      }
+                    }
+                  },
+                  "tys": {
+                    "kind": "Type::Name::TypeList",
+                    "loc": null,
+                    "children": []
+                  }
+                }
+              }
+            }
+          },
+          "vis": {
+            "kind": "Visibility::Default",
+            "loc": null,
+            "children": {}
+          },
+          "attrs": {
+            "kind": "FunDecl::AttrList",
+            "loc": null,
+            "children": []
+          },
+          "doc": ""
+        }
+      },
+      "decl_body": {
+        "kind": "DeclBody::DeclBody",
+        "loc": null,
+        "children": {
+          "local_types": {
+            "kind": "DeclBody::DeclBody::LocalTypeList",
+            "loc": null,
+            "children": []
+          },
+          "expr": {
+            "kind": "Expr::Raise",
+            "loc": null,
+            "children": {
+              "err_value": {
+                "kind": "Expr::Apply",
+                "loc": null,
+                "children": {
+                  "func": {
+                    "kind": "Expr::Constr",
+                    "loc": null,
+                    "children": {
+                      "constr": {
+                        "kind": "Constructor",
+                        "loc": null,
+                        "children": {
+                          "name": {
+                            "kind": "ConstrName",
+                            "loc": null,
+                            "children": {
+                              "name": "E"
+                            }
+                          },
+                          "extra_info": {
+                            "kind": "ConstructorExtraInfo::NoExtraInfo",
+                            "loc": null,
+                            "children": {}
+                          }
+                        }
+                      }
+                    }
+                  },
+                  "args": {
+                    "kind": "Expr::Apply::ArgumentList",
+                    "loc": null,
+                    "children": [
+                      {
+                        "kind": "Argument",
+                        "loc": null,
+                        "children": {
+                          "value": {
+                            "kind": "Expr::Constant",
+                            "loc": null,
+                            "children": {
+                              "constant": {
+                                "kind": "Constant::Int",
+                                "loc": null,
+                                "children": {
+                                  "value": "42"
+                                }
+                              }
+                            }
+                          },
+                          "kind": {
+                            "kind": "ArgumentKind::Positional",
+                            "loc": null,
+                            "children": {}
+                          }
+                        }
+                      },
+                      {
+                        "kind": "Argument",
+                        "loc": null,
+                        "children": {
+                          "value": {
+                            "kind": "Expr::Constant",
+                            "loc": null,
+                            "children": {
+                              "constant": {
+                                "kind": "Constant::Double",
+                                "loc": null,
+                                "children": {
+                                  "value": "4.2"
+                                }
+                              }
+                            }
+                          },
+                          "kind": {
+                            "kind": "ArgumentKind::Positional",
+                            "loc": null,
+                            "children": {}
+                          }
+                        }
+                      }
+                    ]
+                  },
+                  "attr": {
+                    "kind": "ApplyAttr::NoAttr",
+                    "loc": null,
+                    "children": {}
+                  }
+                }
+              }
+            }
+          }
+        }
+      }
+    }
+  },
+  {
+    "kind": "Impl::TopFuncDef",
+    "loc": null,
+    "children": {
+      "fun_decl": {
+        "kind": "FunDecl",
+        "loc": null,
+        "children": {
+          "type_name": null,
+          "name": {
+            "kind": "Binder",
+            "loc": null,
+            "children": {
+              "name": "init"
+            }
+          },
+          "has_error": null,
+          "is_async": null,
+          "decl_params": null,
+          "quantifiers": {
+            "kind": "FunDecl::QuantifierList",
+            "loc": null,
+            "children": []
+          },
+          "return_type": null,
+          "error_type": {
+            "kind": "ErrorType::NoErrorType",
+            "loc": null,
+            "children": {}
+          },
+          "vis": {
+            "kind": "Visibility::Default",
+            "loc": null,
+            "children": {}
+          },
+          "attrs": {
+            "kind": "FunDecl::AttrList",
+            "loc": null,
+            "children": []
+          },
+          "doc": ""
+        }
+      },
+      "decl_body": {
+        "kind": "DeclBody::DeclBody",
+        "loc": null,
+        "children": {
+          "local_types": {
+            "kind": "DeclBody::DeclBody::LocalTypeList",
+            "loc": null,
+            "children": []
+          },
+          "expr": {
+            "kind": "Expr::Try",
+            "loc": null,
+            "children": {
+              "body": {
+                "kind": "Expr::Apply",
+                "loc": null,
+                "children": {
+                  "func": {
+                    "kind": "Expr::Ident",
+                    "loc": null,
+                    "children": {
+                      "id": {
+                        "kind": "Var",
+                        "loc": null,
+                        "children": {
+                          "name": {
+                            "kind": "LongIdent::Ident",
+                            "loc": null,
+                            "children": {
+                              "value": "bar"
+                            }
+                          }
+                        }
+                      }
+                    }
+                  },
+                  "args": {
+                    "kind": "Expr::Apply::ArgumentList",
+                    "loc": null,
+                    "children": []
+                  },
+                  "attr": {
+                    "kind": "ApplyAttr::NoAttr",
+                    "loc": null,
+                    "children": {}
+                  }
+                }
+              },
+              "catch": {
+                "kind": "Expr::Try::CaseList",
+                "loc": null,
+                "children": [
+                  {
+                    "kind": "Case",
+                    "loc": null,
+                    "children": {
+                      "pattern": {
+                        "kind": "Pattern::Constr",
+                        "loc": null,
+                        "children": {
+                          "constr": {
+                            "kind": "Constructor",
+                            "loc": null,
+                            "children": {
+                              "name": {
+                                "kind": "ConstrName",
+                                "loc": null,
+                                "children": {
+                                  "name": "E"
+                                }
+                              },
+                              "extra_info": {
+                                "kind": "ConstructorExtraInfo::NoExtraInfo",
+                                "loc": null,
+                                "children": {}
+                              }
+                            }
+                          },
+                          "args": {
+                            "kind": "Pattern::Constr::ArgList",
+                            "loc": null,
+                            "children": [
+                              {
+                                "kind": "ConstrPatArg",
+                                "loc": null,
+                                "children": {
+                                  "pat": {
+                                    "kind": "Pattern::Var",
+                                    "loc": null,
+                                    "children": {
+                                      "value": {
+                                        "kind": "Binder",
+                                        "loc": null,
+                                        "children": {
+                                          "name": "i"
+                                        }
+                                      }
+                                    }
+                                  },
+                                  "kind": {
+                                    "kind": "ArgumentKind::Positional",
+                                    "loc": null,
+                                    "children": {}
+                                  }
+                                }
+                              },
+                              {
+                                "kind": "ConstrPatArg",
+                                "loc": null,
+                                "children": {
+                                  "pat": {
+                                    "kind": "Pattern::Var",
+                                    "loc": null,
+                                    "children": {
+                                      "value": {
+                                        "kind": "Binder",
+                                        "loc": null,
+                                        "children": {
+                                          "name": "d"
+                                        }
+                                      }
+                                    }
+                                  },
+                                  "kind": {
+                                    "kind": "ArgumentKind::Positional",
+                                    "loc": null,
+                                    "children": {}
+                                  }
+                                }
+                              }
+                            ]
+                          },
+                          "is_open": false
+                        }
+                      },
+                      "guard": null,
+                      "body": {
+                        "kind": "Expr::Apply",
+                        "loc": null,
+                        "children": {
+                          "func": {
+                            "kind": "Expr::Ident",
+                            "loc": null,
+                            "children": {
+                              "id": {
+                                "kind": "Var",
+                                "loc": null,
+                                "children": {
+                                  "name": {
+                                    "kind": "LongIdent::Ident",
+                                    "loc": null,
+                                    "children": {
+                                      "value": "println"
+                                    }
+                                  }
+                                }
+                              }
+                            }
+                          },
+                          "args": {
+                            "kind": "Expr::Apply::ArgumentList",
+                            "loc": null,
+                            "children": [
+                              {
+                                "kind": "Argument",
+                                "loc": null,
+                                "children": {
+                                  "value": {
+                                    "kind": "Expr::Interp",
+                                    "loc": null,
+                                    "children": {
+                                      "elems": {
+                                        "kind": "Expr::Interp::ElemList",
+                                        "loc": null,
+                                        "children": [
+                                          {
+                                            "kind": "InterpElem::Literal",
+                                            "loc": null,
+                                            "children": {
+                                              "repr": "E("
+                                            }
+                                          },
+                                          {
+                                            "kind": "InterpElem::Source",
+                                            "loc": null,
+                                            "children": {
+                                              "source": "i"
+                                            }
+                                          },
+                                          {
+                                            "kind": "InterpElem::Literal",
+                                            "loc": null,
+                                            "children": {
+                                              "repr": ", "
+                                            }
+                                          },
+                                          {
+                                            "kind": "InterpElem::Source",
+                                            "loc": null,
+                                            "children": {
+                                              "source": "d"
+                                            }
+                                          },
+                                          {
+                                            "kind": "InterpElem::Literal",
+                                            "loc": null,
+                                            "children": {
+                                              "repr": ")"
+                                            }
+                                          }
+                                        ]
+                                      }
+                                    }
+                                  },
+                                  "kind": {
+                                    "kind": "ArgumentKind::Positional",
+                                    "loc": null,
+                                    "children": {}
+                                  }
+                                }
+                              }
+                            ]
+                          },
+                          "attr": {
+                            "kind": "ApplyAttr::NoAttr",
+                            "loc": null,
+                            "children": {}
+                          }
+                        }
+                      }
+                    }
+                  }
+                ]
+              },
+              "catch_all": false,
+              "try_else": null,
+              "has_try": true
+            }
+          }
+        }
+      }
+    }
+  }
+]
\ No newline at end of file
diff --git a/test/sync_test/__snapshot__/pipeline_test_error_enum_match.mbt b/test/sync_test/__snapshot__/pipeline_test_error_enum_match.mbt
index 06920130..53ade023 100644
--- a/test/sync_test/__snapshot__/pipeline_test_error_enum_match.mbt
+++ b/test/sync_test/__snapshot__/pipeline_test_error_enum_match.mbt
@@ -15,7 +15,7 @@ fn init {
     DemoError::InvalidChar(pos, ch) =>
       println("invalid char at \{pos.x}: \{ch}")
     _ => println("unknown error")
-  } else {
+  } noraise {
     _ => println("ok")
   }
 }
diff --git a/test/sync_test/__snapshot__/pipeline_test_error_enum_match.mbt.tokens.json b/test/sync_test/__snapshot__/pipeline_test_error_enum_match.mbt.tokens.json
index 2c298616..0d9536fe 100644
--- a/test/sync_test/__snapshot__/pipeline_test_error_enum_match.mbt.tokens.json
+++ b/test/sync_test/__snapshot__/pipeline_test_error_enum_match.mbt.tokens.json
@@ -440,16 +440,16 @@
     "loc": "18:3-18:4"
   },
   {
-    "token": "ELSE",
-    "loc": "18:5-18:9"
+    "token": "NORAISE",
+    "loc": "18:5-18:12"
   },
   {
     "token": "LBRACE",
-    "loc": "18:10-18:11"
+    "loc": "18:13-18:14"
   },
   {
     "token": "NEWLINE",
-    "loc": "18:11-18:12"
+    "loc": "18:14-18:15"
   },
   {
     "token": "UNDERSCORE",
diff --git a/test/sync_test/__snapshot__/pipeline_test_error_handle2.json b/test/sync_test/__snapshot__/pipeline_test_error_handle2.json
index 104bddbc..8e088328 100644
--- a/test/sync_test/__snapshot__/pipeline_test_error_handle2.json
+++ b/test/sync_test/__snapshot__/pipeline_test_error_handle2.json
@@ -3362,31 +3362,18 @@
                                             ]
                                           },
                                           "body": {
-                                            "kind": "Expr::If",
+                                            "kind": "Expr::Group",
                                             "loc": null,
                                             "children": {
-                                              "cond": {
-                                                "kind": "Expr::Infix",
+                                              "expr": {
+                                                "kind": "Expr::If",
                                                 "loc": null,
                                                 "children": {
-                                                  "op": {
-                                                    "kind": "Var",
-                                                    "loc": null,
-                                                    "children": {
-                                                      "name": {
-                                                        "kind": "LongIdent::Ident",
-                                                        "loc": null,
-                                                        "children": {
-                                                          "value": "<"
-                                                        }
-                                                      }
-                                                    }
-                                                  },
-                                                  "lhs": {
-                                                    "kind": "Expr::Ident",
+                                                  "cond": {
+                                                    "kind": "Expr::Infix",
                                                     "loc": null,
                                                     "children": {
-                                                      "id": {
+                                                      "op": {
                                                         "kind": "Var",
                                                         "loc": null,
                                                         "children": {
@@ -3394,50 +3381,50 @@
                                                             "kind": "LongIdent::Ident",
                                                             "loc": null,
                                                             "children": {
-                                                              "value": "x"
+                                                              "value": "<"
                                                             }
                                                           }
                                                         }
-                                                      }
-                                                    }
-                                                  },
-                                                  "rhs": {
-                                                    "kind": "Expr::Constant",
-                                                    "loc": null,
-                                                    "children": {
-                                                      "constant": {
-                                                        "kind": "Constant::Int",
+                                                      },
+                                                      "lhs": {
+                                                        "kind": "Expr::Ident",
                                                         "loc": null,
                                                         "children": {
-                                                          "value": "5"
+                                                          "id": {
+                                                            "kind": "Var",
+                                                            "loc": null,
+                                                            "children": {
+                                                              "name": {
+                                                                "kind": "LongIdent::Ident",
+                                                                "loc": null,
+                                                                "children": {
+                                                                  "value": "x"
+                                                                }
+                                                              }
+                                                            }
+                                                          }
                                                         }
-                                                      }
-                                                    }
-                                                  }
-                                                }
-                                              },
-                                              "ifso": {
-                                                "kind": "Expr::Infix",
-                                                "loc": null,
-                                                "children": {
-                                                  "op": {
-                                                    "kind": "Var",
-                                                    "loc": null,
-                                                    "children": {
-                                                      "name": {
-                                                        "kind": "LongIdent::Ident",
+                                                      },
+                                                      "rhs": {
+                                                        "kind": "Expr::Constant",
                                                         "loc": null,
                                                         "children": {
-                                                          "value": "+"
+                                                          "constant": {
+                                                            "kind": "Constant::Int",
+                                                            "loc": null,
+                                                            "children": {
+                                                              "value": "5"
+                                                            }
+                                                          }
                                                         }
                                                       }
                                                     }
                                                   },
-                                                  "lhs": {
-                                                    "kind": "Expr::Ident",
+                                                  "ifso": {
+                                                    "kind": "Expr::Infix",
                                                     "loc": null,
                                                     "children": {
-                                                      "id": {
+                                                      "op": {
                                                         "kind": "Var",
                                                         "loc": null,
                                                         "children": {
@@ -3445,87 +3432,111 @@
                                                             "kind": "LongIdent::Ident",
                                                             "loc": null,
                                                             "children": {
-                                                              "value": "x"
+                                                              "value": "+"
                                                             }
                                                           }
                                                         }
-                                                      }
-                                                    }
-                                                  },
-                                                  "rhs": {
-                                                    "kind": "Expr::Constant",
-                                                    "loc": null,
-                                                    "children": {
-                                                      "constant": {
-                                                        "kind": "Constant::Int",
+                                                      },
+                                                      "lhs": {
+                                                        "kind": "Expr::Ident",
                                                         "loc": null,
                                                         "children": {
-                                                          "value": "1"
+                                                          "id": {
+                                                            "kind": "Var",
+                                                            "loc": null,
+                                                            "children": {
+                                                              "name": {
+                                                                "kind": "LongIdent::Ident",
+                                                                "loc": null,
+                                                                "children": {
+                                                                  "value": "x"
+                                                                }
+                                                              }
+                                                            }
+                                                          }
                                                         }
-                                                      }
-                                                    }
-                                                  }
-                                                }
-                                              },
-                                              "ifnot": {
-                                                "kind": "Expr::Apply",
-                                                "loc": null,
-                                                "children": {
-                                                  "func": {
-                                                    "kind": "Expr::Ident",
-                                                    "loc": null,
-                                                    "children": {
-                                                      "id": {
-                                                        "kind": "Var",
+                                                      },
+                                                      "rhs": {
+                                                        "kind": "Expr::Constant",
                                                         "loc": null,
                                                         "children": {
-                                                          "name": {
-                                                            "kind": "LongIdent::Ident",
+                                                          "constant": {
+                                                            "kind": "Constant::Int",
                                                             "loc": null,
                                                             "children": {
-                                                              "value": "fail"
+                                                              "value": "1"
                                                             }
                                                           }
                                                         }
                                                       }
                                                     }
                                                   },
-                                                  "args": {
-                                                    "kind": "Expr::Apply::ArgumentList",
+                                                  "ifnot": {
+                                                    "kind": "Expr::Apply",
                                                     "loc": null,
-                                                    "children": [
-                                                      {
-                                                        "kind": "Argument",
+                                                    "children": {
+                                                      "func": {
+                                                        "kind": "Expr::Ident",
                                                         "loc": null,
                                                         "children": {
-                                                          "value": {
-                                                            "kind": "Expr::Constant",
+                                                          "id": {
+                                                            "kind": "Var",
                                                             "loc": null,
                                                             "children": {
-                                                              "constant": {
-                                                                "kind": "Constant::String",
+                                                              "name": {
+                                                                "kind": "LongIdent::Ident",
                                                                 "loc": null,
                                                                 "children": {
-                                                                  "value": "too big"
+                                                                  "value": "fail"
                                                                 }
                                                               }
                                                             }
-                                                          },
-                                                          "kind": {
-                                                            "kind": "ArgumentKind::Positional",
-                                                            "loc": null,
-                                                            "children": {}
                                                           }
                                                         }
+                                                      },
+                                                      "args": {
+                                                        "kind": "Expr::Apply::ArgumentList",
+                                                        "loc": null,
+                                                        "children": [
+                                                          {
+                                                            "kind": "Argument",
+                                                            "loc": null,
+                                                            "children": {
+                                                              "value": {
+                                                                "kind": "Expr::Constant",
+                                                                "loc": null,
+                                                                "children": {
+                                                                  "constant": {
+                                                                    "kind": "Constant::String",
+                                                                    "loc": null,
+                                                                    "children": {
+                                                                      "value": "too big"
+                                                                    }
+                                                                  }
+                                                                }
+                                                              },
+                                                              "kind": {
+                                                                "kind": "ArgumentKind::Positional",
+                                                                "loc": null,
+                                                                "children": {}
+                                                              }
+                                                            }
+                                                          }
+                                                        ]
+                                                      },
+                                                      "attr": {
+                                                        "kind": "ApplyAttr::NoAttr",
+                                                        "loc": null,
+                                                        "children": {}
                                                       }
-                                                    ]
-                                                  },
-                                                  "attr": {
-                                                    "kind": "ApplyAttr::NoAttr",
-                                                    "loc": null,
-                                                    "children": {}
+                                                    }
                                                   }
                                                 }
+                                              },
+                                              "group": {
+                                                "kind": "Group::Brace",
+                                                "loc": null,
+                                                "children": {}
                                               }
                                             }
                                           },
@@ -3536,7 +3547,7 @@
                                             "children": {}
                                           },
                                           "kind": {
-                                            "kind": "FnKind::Lambda",
+                                            "kind": "FnKind::Arrow",
                                             "loc": null,
                                             "children": {}
                                           },
@@ -3992,7 +4003,7 @@
                                                 "children": {}
                                               },
                                               "kind": {
-                                                "kind": "FnKind::Lambda",
+                                                "kind": "FnKind::Arrow",
                                                 "loc": null,
                                                 "children": {}
                                               },
diff --git a/test/sync_test/__snapshot__/pipeline_test_error_handle2.mbt b/test/sync_test/__snapshot__/pipeline_test_error_handle2.mbt
index 81027ead..79b5128a 100644
--- a/test/sync_test/__snapshot__/pipeline_test_error_handle2.mbt
+++ b/test/sync_test/__snapshot__/pipeline_test_error_handle2.mbt
@@ -46,13 +46,13 @@ struct T {
 
 fn init {
   let xs = List::from_array([1, 2, 3, 4])
-  let ys = try! map_with_error(xs, fn (x) {
+  let ys = try! map_with_error(xs, x => {
     if x < 5 { x + 1 } else { fail("too big") }
   })
   println(ys)
   let t = T::{
     a: Failure::Failure("1"),
-    b: fn (x) { if x < 5 { x - 1 } else { fail("42") } },
+    b: x => if x < 5 { x - 1 } else { fail("42") },
   }
   let zs = try! map_with_error(xs, t.b)
   println(zs)
diff --git a/test/sync_test/__snapshot__/pipeline_test_error_handle2.mbt.tokens.json b/test/sync_test/__snapshot__/pipeline_test_error_handle2.mbt.tokens.json
index fc9add39..b9cdb5ae 100644
--- a/test/sync_test/__snapshot__/pipeline_test_error_handle2.mbt.tokens.json
+++ b/test/sync_test/__snapshot__/pipeline_test_error_handle2.mbt.tokens.json
@@ -1933,32 +1933,24 @@
     "token": "COMMA",
     "loc": "49:34-49:35"
   },
-  {
-    "token": "FN",
-    "loc": "49:36-49:38"
-  },
-  {
-    "token": "LPAREN",
-    "loc": "49:39-49:40"
-  },
   {
     "token": [
       "LIDENT",
       "x"
     ],
-    "loc": "49:40-49:41"
+    "loc": "49:36-49:37"
   },
   {
-    "token": "RPAREN",
-    "loc": "49:41-49:42"
+    "token": "FAT_ARROW",
+    "loc": "49:38-49:40"
   },
   {
     "token": "LBRACE",
-    "loc": "49:43-49:44"
+    "loc": "49:41-49:42"
   },
   {
     "token": "NEWLINE",
-    "loc": "49:44-49:45"
+    "loc": "49:42-49:43"
   },
   {
     "token": "IF",
@@ -2198,125 +2190,109 @@
     "token": "COLON",
     "loc": "55:6-55:7"
   },
-  {
-    "token": "FN",
-    "loc": "55:8-55:10"
-  },
-  {
-    "token": "LPAREN",
-    "loc": "55:11-55:12"
-  },
   {
     "token": [
       "LIDENT",
       "x"
     ],
-    "loc": "55:12-55:13"
-  },
-  {
-    "token": "RPAREN",
-    "loc": "55:13-55:14"
+    "loc": "55:8-55:9"
   },
   {
-    "token": "LBRACE",
-    "loc": "55:15-55:16"
+    "token": "FAT_ARROW",
+    "loc": "55:10-55:12"
   },
   {
     "token": "IF",
-    "loc": "55:17-55:19"
+    "loc": "55:13-55:15"
   },
   {
     "token": [
       "LIDENT",
       "x"
     ],
-    "loc": "55:20-55:21"
+    "loc": "55:16-55:17"
   },
   {
     "token": [
       "INFIX1",
       "<"
     ],
-    "loc": "55:22-55:23"
+    "loc": "55:18-55:19"
   },
   {
     "token": [
       "INT",
       "5"
     ],
-    "loc": "55:24-55:25"
+    "loc": "55:20-55:21"
   },
   {
     "token": "LBRACE",
-    "loc": "55:26-55:27"
+    "loc": "55:22-55:23"
   },
   {
     "token": [
       "LIDENT",
       "x"
     ],
-    "loc": "55:28-55:29"
+    "loc": "55:24-55:25"
   },
   {
     "token": "MINUS",
-    "loc": "55:30-55:31"
+    "loc": "55:26-55:27"
   },
   {
     "token": [
       "INT",
       "1"
     ],
-    "loc": "55:32-55:33"
+    "loc": "55:28-55:29"
   },
   {
     "token": "RBRACE",
-    "loc": "55:34-55:35"
+    "loc": "55:30-55:31"
   },
   {
     "token": "ELSE",
-    "loc": "55:36-55:40"
+    "loc": "55:32-55:36"
   },
   {
     "token": "LBRACE",
-    "loc": "55:41-55:42"
+    "loc": "55:37-55:38"
   },
   {
     "token": [
       "LIDENT",
       "fail"
     ],
-    "loc": "55:43-55:47"
+    "loc": "55:39-55:43"
   },
   {
     "token": "LPAREN",
-    "loc": "55:47-55:48"
+    "loc": "55:43-55:44"
   },
   {
     "token": [
       "STRING",
       "42"
     ],
-    "loc": "55:48-55:52"
+    "loc": "55:44-55:48"
   },
   {
     "token": "RPAREN",
-    "loc": "55:52-55:53"
+    "loc": "55:48-55:49"
   },
   {
     "token": "RBRACE",
-    "loc": "55:54-55:55"
-  },
-  {
-    "token": "RBRACE",
-    "loc": "55:56-55:57"
+    "loc": "55:50-55:51"
   },
   {
     "token": "COMMA",
-    "loc": "55:57-55:58"
+    "loc": "55:51-55:52"
   },
   {
     "token": "NEWLINE",
-    "loc": "55:58-55:59"
+    "loc": "55:52-55:53"
   },
   {
     "token": "RBRACE",
diff --git a/test/sync_test/__snapshot__/pipeline_test_error_poly_dce.json b/test/sync_test/__snapshot__/pipeline_test_error_poly_dce.json
index ab40c14b..d101edf0 100644
--- a/test/sync_test/__snapshot__/pipeline_test_error_poly_dce.json
+++ b/test/sync_test/__snapshot__/pipeline_test_error_poly_dce.json
@@ -949,7 +949,7 @@
                                                         "children": {}
                                                       },
                                                       "kind": {
-                                                        "kind": "FnKind::Lambda",
+                                                        "kind": "FnKind::Arrow",
                                                         "loc": null,
                                                         "children": {}
                                                       },
diff --git a/test/sync_test/__snapshot__/pipeline_test_error_poly_dce.mbt b/test/sync_test/__snapshot__/pipeline_test_error_poly_dce.mbt
index c52a4625..9b8b6cde 100644
--- a/test/sync_test/__snapshot__/pipeline_test_error_poly_dce.mbt
+++ b/test/sync_test/__snapshot__/pipeline_test_error_poly_dce.mbt
@@ -18,6 +18,6 @@ suberror E {
 
 ///|
 fn main {
-  println(try? h(fn(x) { raise E(x) }))
+  println(try? h(x => raise E(x)))
   h(fn(x) { println(x) })
 }
diff --git a/test/sync_test/__snapshot__/pipeline_test_error_poly_dce.mbt.tokens.json b/test/sync_test/__snapshot__/pipeline_test_error_poly_dce.mbt.tokens.json
index f844e216..59a072db 100644
--- a/test/sync_test/__snapshot__/pipeline_test_error_poly_dce.mbt.tokens.json
+++ b/test/sync_test/__snapshot__/pipeline_test_error_poly_dce.mbt.tokens.json
@@ -504,77 +504,61 @@
     "token": "LPAREN",
     "loc": "21:17-21:18"
   },
-  {
-    "token": "FN",
-    "loc": "21:18-21:20"
-  },
-  {
-    "token": "LPAREN",
-    "loc": "21:20-21:21"
-  },
   {
     "token": [
       "LIDENT",
       "x"
     ],
-    "loc": "21:21-21:22"
+    "loc": "21:18-21:19"
   },
   {
-    "token": "RPAREN",
-    "loc": "21:22-21:23"
-  },
-  {
-    "token": "LBRACE",
-    "loc": "21:24-21:25"
+    "token": "FAT_ARROW",
+    "loc": "21:20-21:22"
   },
   {
     "token": "RAISE",
-    "loc": "21:26-21:31"
+    "loc": "21:23-21:28"
   },
   {
     "token": [
       "UIDENT",
       "E"
     ],
-    "loc": "21:32-21:33"
+    "loc": "21:29-21:30"
   },
   {
     "token": "LPAREN",
-    "loc": "21:33-21:34"
+    "loc": "21:30-21:31"
   },
   {
     "token": [
       "LIDENT",
       "x"
     ],
-    "loc": "21:34-21:35"
+    "loc": "21:31-21:32"
   },
   {
     "token": "RPAREN",
-    "loc": "21:35-21:36"
-  },
-  {
-    "token": "RBRACE",
-    "loc": "21:37-21:38"
+    "loc": "21:32-21:33"
   },
   {
     "token": "RPAREN",
-    "loc": "21:38-21:39"
+    "loc": "21:33-21:34"
   },
   {
     "token": "RPAREN",
-    "loc": "21:39-21:40"
+    "loc": "21:34-21:35"
   },
   {
     "token": [
       "SEMI",
       false
     ],
-    "loc": "21:40-21:40"
+    "loc": "21:35-21:35"
   },
   {
     "token": "NEWLINE",
-    "loc": "21:40-21:41"
+    "loc": "21:35-21:36"
   },
   {
     "token": [
diff --git a/test/sync_test/__snapshot__/pipeline_test_error_poly_iter.json b/test/sync_test/__snapshot__/pipeline_test_error_poly_iter.json
new file mode 100644
index 00000000..3fdd1e5f
--- /dev/null
+++ b/test/sync_test/__snapshot__/pipeline_test_error_poly_iter.json
@@ -0,0 +1,12085 @@
+[
+  {
+    "kind": "Impl::TopFuncDef",
+    "loc": null,
+    "children": {
+      "fun_decl": {
+        "kind": "FunDecl",
+        "loc": null,
+        "children": {
+          "type_name": null,
+          "name": {
+            "kind": "Binder",
+            "loc": null,
+            "children": {
+              "name": "from_bytes"
+            }
+          },
+          "has_error": null,
+          "is_async": null,
+          "decl_params": {
+            "kind": "FunDecl::ParameterList",
+            "loc": null,
+            "children": [
+              {
+                "kind": "Parameter::Positional",
+                "loc": null,
+                "children": {
+                  "binder": {
+                    "kind": "Binder",
+                    "loc": null,
+                    "children": {
+                      "name": "b"
+                    }
+                  },
+                  "ty": {
+                    "kind": "Type::Name",
+                    "loc": null,
+                    "children": {
+                      "constr_id": {
+                        "kind": "ConstrId",
+                        "loc": null,
+                        "children": {
+                          "id": {
+                            "kind": "LongIdent::Ident",
+                            "loc": null,
+                            "children": {
+                              "value": "Bytes"
+                            }
+                          }
+                        }
+                      },
+                      "tys": {
+                        "kind": "Type::Name::TypeList",
+                        "loc": null,
+                        "children": []
+                      }
+                    }
+                  }
+                }
+              }
+            ]
+          },
+          "quantifiers": {
+            "kind": "FunDecl::QuantifierList",
+            "loc": null,
+            "children": []
+          },
+          "return_type": {
+            "kind": "Type::Arrow",
+            "loc": null,
+            "children": {
+              "args": {
+                "kind": "Type::Arrow::ArgList",
+                "loc": null,
+                "children": [
+                  {
+                    "kind": "Type::Arrow",
+                    "loc": null,
+                    "children": {
+                      "args": {
+                        "kind": "Type::Arrow::ArgList",
+                        "loc": null,
+                        "children": [
+                          {
+                            "kind": "Type::Name",
+                            "loc": null,
+                            "children": {
+                              "constr_id": {
+                                "kind": "ConstrId",
+                                "loc": null,
+                                "children": {
+                                  "id": {
+                                    "kind": "LongIdent::Ident",
+                                    "loc": null,
+                                    "children": {
+                                      "value": "Byte"
+                                    }
+                                  }
+                                }
+                              },
+                              "tys": {
+                                "kind": "Type::Name::TypeList",
+                                "loc": null,
+                                "children": []
+                              }
+                            }
+                          }
+                        ]
+                      },
+                      "res": {
+                        "kind": "Type::Name",
+                        "loc": null,
+                        "children": {
+                          "constr_id": {
+                            "kind": "ConstrId",
+                            "loc": null,
+                            "children": {
+                              "id": {
+                                "kind": "LongIdent::Ident",
+                                "loc": null,
+                                "children": {
+                                  "value": "IterResult"
+                                }
+                              }
+                            }
+                          },
+                          "tys": {
+                            "kind": "Type::Name::TypeList",
+                            "loc": null,
+                            "children": []
+                          }
+                        }
+                      },
+                      "err": {
+                        "kind": "ErrorType::NoErrorType",
+                        "loc": null,
+                        "children": {}
+                      },
+                      "is_async": null
+                    }
+                  }
+                ]
+              },
+              "res": {
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+                                                              },
+                                                              {
+                                                                "kind": "Expr::Constant",
+                                                                "loc": null,
+                                                                "children": {
+                                                                  "constant": {
+                                                                    "kind": "Constant::String",
+                                                                    "loc": null,
+                                                                    "children": {
+                                                                      "value": "五六"
+                                                                    }
+                                                                  }
+                                                                }
+                                                              },
+                                                              {
+                                                                "kind": "Expr::Constant",
+                                                                "loc": null,
+                                                                "children": {
+                                                                  "constant": {
+                                                                    "kind": "Constant::String",
+                                                                    "loc": null,
+                                                                    "children": {
+                                                                      "value": "七八"
+                                                                    }
+                                                                  }
+                                                                }
+                                                              },
+                                                              {
+                                                                "kind": "Expr::Constant",
+                                                                "loc": null,
+                                                                "children": {
+                                                                  "constant": {
+                                                                    "kind": "Constant::String",
+                                                                    "loc": null,
+                                                                    "children": {
+                                                                      "value": "九十"
+                                                                    }
+                                                                  }
+                                                                }
+                                                              }
+                                                            ]
+                                                          }
+                                                        }
+                                                      },
+                                                      "method_name": {
+                                                        "kind": "Label",
+                                                        "loc": null,
+                                                        "children": {
+                                                          "name": "map"
+                                                        }
+                                                      },
+                                                      "args": {
+                                                        "kind": "Expr::DotApply::ArgList",
+                                                        "loc": null,
+                                                        "children": [
+                                                          {
+                                                            "kind": "Argument",
+                                                            "loc": null,
+                                                            "children": {
+                                                              "value": {
+                                                                "kind": "Expr::Function",
+                                                                "loc": null,
+                                                                "children": {
+                                                                  "func": {
+                                                                    "kind": "Func::Lambda",
+                                                                    "loc": null,
+                                                                    "children": {
+                                                                      "parameters": {
+                                                                        "kind": "Func::Lambda::ParameterList",
+                                                                        "loc": null,
+                                                                        "children": [
+                                                                          {
+                                                                            "kind": "Parameter::Positional",
+                                                                            "loc": null,
+                                                                            "children": {
+                                                                              "binder": {
+                                                                                "kind": "Binder",
+                                                                                "loc": null,
+                                                                                "children": {
+                                                                                  "name": "s"
+                                                                                }
+                                                                              },
+                                                                              "ty": null
+                                                                            }
+                                                                          }
+                                                                        ]
+                                                                      },
+                                                                      "body": {
+                                                                        "kind": "Expr::Apply",
+                                                                        "loc": null,
+                                                                        "children": {
+                                                                          "func": {
+                                                                            "kind": "Expr::Ident",
+                                                                            "loc": null,
+                                                                            "children": {
+                                                                              "id": {
+                                                                                "kind": "Var",
+                                                                                "loc": null,
+                                                                                "children": {
+                                                                                  "name": {
+                                                                                    "kind": "LongIdent::Dot",
+                                                                                    "loc": null,
+                                                                                    "children": {
+                                                                                      "pkg": "encoding/utf16",
+                                                                                      "id": "encode"
+                                                                                    }
+                                                                                  }
+                                                                                }
+                                                                              }
+                                                                            }
+                                                                          },
+                                                                          "args": {
+                                                                            "kind": "Expr::Apply::ArgumentList",
+                                                                            "loc": null,
+                                                                            "children": [
+                                                                              {
+                                                                                "kind": "Argument",
+                                                                                "loc": null,
+                                                                                "children": {
+                                                                                  "value": {
+                                                                                    "kind": "Expr::Ident",
+                                                                                    "loc": null,
+                                                                                    "children": {
+                                                                                      "id": {
+                                                                                        "kind": "Var",
+                                                                                        "loc": null,
+                                                                                        "children": {
+                                                                                          "name": {
+                                                                                            "kind": "LongIdent::Ident",
+                                                                                            "loc": null,
+                                                                                            "children": {
+                                                                                              "value": "s"
+                                                                                            }
+                                                                                          }
+                                                                                        }
+                                                                                      }
+                                                                                    }
+                                                                                  },
+                                                                                  "kind": {
+                                                                                    "kind": "ArgumentKind::Positional",
+                                                                                    "loc": null,
+                                                                                    "children": {}
+                                                                                  }
+                                                                                }
+                                                                              }
+                                                                            ]
+                                                                          },
+                                                                          "attr": {
+                                                                            "kind": "ApplyAttr::NoAttr",
+                                                                            "loc": null,
+                                                                            "children": {}
+                                                                          }
+                                                                        }
+                                                                      },
+                                                                      "return_type": null,
+                                                                      "error_type": {
+                                                                        "kind": "ErrorType::NoErrorType",
+                                                                        "loc": null,
+                                                                        "children": {}
+                                                                      },
+                                                                      "kind": {
+                                                                        "kind": "FnKind::Arrow",
+                                                                        "loc": null,
+                                                                        "children": {}
+                                                                      },
+                                                                      "has_error": null,
+                                                                      "is_async": null
+                                                                    }
+                                                                  }
+                                                                }
+                                                              },
+                                                              "kind": {
+                                                                "kind": "ArgumentKind::Positional",
+                                                                "loc": null,
+                                                                "children": {}
+                                                              }
+                                                            }
+                                                          }
+                                                        ]
+                                                      },
+                                                      "return_self": false,
+                                                      "attr": {
+                                                        "kind": "ApplyAttr::NoAttr",
+                                                        "loc": null,
+                                                        "children": {}
+                                                      }
+                                                    }
+                                                  },
+                                                  "kind": {
+                                                    "kind": "ArgumentKind::Positional",
+                                                    "loc": null,
+                                                    "children": {}
+                                                  }
+                                                }
+                                              },
+                                              {
+                                                "kind": "Argument",
+                                                "loc": null,
+                                                "children": {
+                                                  "value": {
+                                                    "kind": "Expr::Constant",
+                                                    "loc": null,
+                                                    "children": {
+                                                      "constant": {
+                                                        "kind": "Constant::Int",
+                                                        "loc": null,
+                                                        "children": {
+                                                          "value": "7"
+                                                        }
+                                                      }
+                                                    }
+                                                  },
+                                                  "kind": {
+                                                    "kind": "ArgumentKind::Positional",
+                                                    "loc": null,
+                                                    "children": {}
+                                                  }
+                                                }
+                                              }
+                                            ]
+                                          },
+                                          "attr": {
+                                            "kind": "ApplyAttr::NoAttr",
+                                            "loc": null,
+                                            "children": {}
+                                          }
+                                        }
+                                      },
+                                      "kind": {
+                                        "kind": "TryOperatorKind::Question",
+                                        "loc": null,
+                                        "children": {}
+                                      }
+                                    }
+                                  },
+                                  "kind": {
+                                    "kind": "ArgumentKind::Positional",
+                                    "loc": null,
+                                    "children": {}
+                                  }
+                                }
+                              }
+                            ]
+                          },
+                          "attr": {
+                            "kind": "ApplyAttr::NoAttr",
+                            "loc": null,
+                            "children": {}
+                          }
+                        }
+                      }
+                    ]
+                  },
+                  "last_expr": {
+                    "kind": "Expr::Apply",
+                    "loc": null,
+                    "children": {
+                      "func": {
+                        "kind": "Expr::Ident",
+                        "loc": null,
+                        "children": {
+                          "id": {
+                            "kind": "Var",
+                            "loc": null,
+                            "children": {
+                              "name": {
+                                "kind": "LongIdent::Ident",
+                                "loc": null,
+                                "children": {
+                                  "value": "println"
+                                }
+                              }
+                            }
+                          }
+                        }
+                      },
+                      "args": {
+                        "kind": "Expr::Apply::ArgumentList",
+                        "loc": null,
+                        "children": [
+                          {
+                            "kind": "Argument",
+                            "loc": null,
+                            "children": {
+                              "value": {
+                                "kind": "Expr::TryOperator",
+                                "loc": null,
+                                "children": {
+                                  "body": {
+                                    "kind": "Expr::Apply",
+                                    "loc": null,
+                                    "children": {
+                                      "func": {
+                                        "kind": "Expr::Ident",
+                                        "loc": null,
+                                        "children": {
+                                          "id": {
+                                            "kind": "Var",
+                                            "loc": null,
+                                            "children": {
+                                              "name": {
+                                                "kind": "LongIdent::Ident",
+                                                "loc": null,
+                                                "children": {
+                                                  "value": "run"
+                                                }
+                                              }
+                                            }
+                                          }
+                                        }
+                                      },
+                                      "args": {
+                                        "kind": "Expr::Apply::ArgumentList",
+                                        "loc": null,
+                                        "children": [
+                                          {
+                                            "kind": "Argument",
+                                            "loc": null,
+                                            "children": {
+                                              "value": {
+                                                "kind": "Expr::DotApply",
+                                                "loc": null,
+                                                "children": {
+                                                  "self": {
+                                                    "kind": "Expr::Array",
+                                                    "loc": null,
+                                                    "children": {
+                                                      "exprs": {
+                                                        "kind": "Expr::Array::ExprList",
+                                                        "loc": null,
+                                                        "children": [
+                                                          {
+                                                            "kind": "Expr::Constant",
+                                                            "loc": null,
+                                                            "children": {
+                                                              "constant": {
+                                                                "kind": "Constant::String",
+                                                                "loc": null,
+                                                                "children": {
+                                                                  "value": "abcdefghij"
+                                                                }
+                                                              }
+                                                            }
+                                                          },
+                                                          {
+                                                            "kind": "Expr::Constant",
+                                                            "loc": null,
+                                                            "children": {
+                                                              "constant": {
+                                                                "kind": "Constant::String",
+                                                                "loc": null,
+                                                                "children": {
+                                                                  "value": "klmnopqrst"
+                                                                }
+                                                              }
+                                                            }
+                                                          },
+                                                          {
+                                                            "kind": "Expr::Constant",
+                                                            "loc": null,
+                                                            "children": {
+                                                              "constant": {
+                                                                "kind": "Constant::String",
+                                                                "loc": null,
+                                                                "children": {
+                                                                  "value": "uvwxyz"
+                                                                }
+                                                              }
+                                                            }
+                                                          }
+                                                        ]
+                                                      }
+                                                    }
+                                                  },
+                                                  "method_name": {
+                                                    "kind": "Label",
+                                                    "loc": null,
+                                                    "children": {
+                                                      "name": "map"
+                                                    }
+                                                  },
+                                                  "args": {
+                                                    "kind": "Expr::DotApply::ArgList",
+                                                    "loc": null,
+                                                    "children": [
+                                                      {
+                                                        "kind": "Argument",
+                                                        "loc": null,
+                                                        "children": {
+                                                          "value": {
+                                                            "kind": "Expr::Function",
+                                                            "loc": null,
+                                                            "children": {
+                                                              "func": {
+                                                                "kind": "Func::Lambda",
+                                                                "loc": null,
+                                                                "children": {
+                                                                  "parameters": {
+                                                                    "kind": "Func::Lambda::ParameterList",
+                                                                    "loc": null,
+                                                                    "children": [
+                                                                      {
+                                                                        "kind": "Parameter::Positional",
+                                                                        "loc": null,
+                                                                        "children": {
+                                                                          "binder": {
+                                                                            "kind": "Binder",
+                                                                            "loc": null,
+                                                                            "children": {
+                                                                              "name": "s"
+                                                                            }
+                                                                          },
+                                                                          "ty": null
+                                                                        }
+                                                                      }
+                                                                    ]
+                                                                  },
+                                                                  "body": {
+                                                                    "kind": "Expr::Apply",
+                                                                    "loc": null,
+                                                                    "children": {
+                                                                      "func": {
+                                                                        "kind": "Expr::Ident",
+                                                                        "loc": null,
+                                                                        "children": {
+                                                                          "id": {
+                                                                            "kind": "Var",
+                                                                            "loc": null,
+                                                                            "children": {
+                                                                              "name": {
+                                                                                "kind": "LongIdent::Dot",
+                                                                                "loc": null,
+                                                                                "children": {
+                                                                                  "pkg": "encoding/utf16",
+                                                                                  "id": "encode"
+                                                                                }
+                                                                              }
+                                                                            }
+                                                                          }
+                                                                        }
+                                                                      },
+                                                                      "args": {
+                                                                        "kind": "Expr::Apply::ArgumentList",
+                                                                        "loc": null,
+                                                                        "children": [
+                                                                          {
+                                                                            "kind": "Argument",
+                                                                            "loc": null,
+                                                                            "children": {
+                                                                              "value": {
+                                                                                "kind": "Expr::Ident",
+                                                                                "loc": null,
+                                                                                "children": {
+                                                                                  "id": {
+                                                                                    "kind": "Var",
+                                                                                    "loc": null,
+                                                                                    "children": {
+                                                                                      "name": {
+                                                                                        "kind": "LongIdent::Ident",
+                                                                                        "loc": null,
+                                                                                        "children": {
+                                                                                          "value": "s"
+                                                                                        }
+                                                                                      }
+                                                                                    }
+                                                                                  }
+                                                                                }
+                                                                              },
+                                                                              "kind": {
+                                                                                "kind": "ArgumentKind::Positional",
+                                                                                "loc": null,
+                                                                                "children": {}
+                                                                              }
+                                                                            }
+                                                                          }
+                                                                        ]
+                                                                      },
+                                                                      "attr": {
+                                                                        "kind": "ApplyAttr::NoAttr",
+                                                                        "loc": null,
+                                                                        "children": {}
+                                                                      }
+                                                                    }
+                                                                  },
+                                                                  "return_type": null,
+                                                                  "error_type": {
+                                                                    "kind": "ErrorType::NoErrorType",
+                                                                    "loc": null,
+                                                                    "children": {}
+                                                                  },
+                                                                  "kind": {
+                                                                    "kind": "FnKind::Arrow",
+                                                                    "loc": null,
+                                                                    "children": {}
+                                                                  },
+                                                                  "has_error": null,
+                                                                  "is_async": null
+                                                                }
+                                                              }
+                                                            }
+                                                          },
+                                                          "kind": {
+                                                            "kind": "ArgumentKind::Positional",
+                                                            "loc": null,
+                                                            "children": {}
+                                                          }
+                                                        }
+                                                      }
+                                                    ]
+                                                  },
+                                                  "return_self": false,
+                                                  "attr": {
+                                                    "kind": "ApplyAttr::NoAttr",
+                                                    "loc": null,
+                                                    "children": {}
+                                                  }
+                                                }
+                                              },
+                                              "kind": {
+                                                "kind": "ArgumentKind::Positional",
+                                                "loc": null,
+                                                "children": {}
+                                              }
+                                            }
+                                          },
+                                          {
+                                            "kind": "Argument",
+                                            "loc": null,
+                                            "children": {
+                                              "value": {
+                                                "kind": "Expr::Constant",
+                                                "loc": null,
+                                                "children": {
+                                                  "constant": {
+                                                    "kind": "Constant::Int",
+                                                    "loc": null,
+                                                    "children": {
+                                                      "value": "10"
+                                                    }
+                                                  }
+                                                }
+                                              },
+                                              "kind": {
+                                                "kind": "ArgumentKind::Positional",
+                                                "loc": null,
+                                                "children": {}
+                                              }
+                                            }
+                                          }
+                                        ]
+                                      },
+                                      "attr": {
+                                        "kind": "ApplyAttr::NoAttr",
+                                        "loc": null,
+                                        "children": {}
+                                      }
+                                    }
+                                  },
+                                  "kind": {
+                                    "kind": "TryOperatorKind::Question",
+                                    "loc": null,
+                                    "children": {}
+                                  }
+                                }
+                              },
+                              "kind": {
+                                "kind": "ArgumentKind::Positional",
+                                "loc": null,
+                                "children": {}
+                              }
+                            }
+                          }
+                        ]
+                      },
+                      "attr": {
+                        "kind": "ApplyAttr::NoAttr",
+                        "loc": null,
+                        "children": {}
+                      }
+                    }
+                  }
+                }
+              }
+            }
+          }
+        }
+      }
+    }
+  }
+]
\ No newline at end of file
diff --git a/test/sync_test/__snapshot__/pipeline_test_error_poly_iter.mbt b/test/sync_test/__snapshot__/pipeline_test_error_poly_iter.mbt
index d00a1f83..b3f0a3b6 100644
--- a/test/sync_test/__snapshot__/pipeline_test_error_poly_iter.mbt
+++ b/test/sync_test/__snapshot__/pipeline_test_error_poly_iter.mbt
@@ -28,7 +28,7 @@ fn[X] collect(
   it : ((X) -> IterResult) -> IterResult raise?,
 ) -> Array[X] raise? {
   let result = []
-  each(it, result.push(_))
+  each(it, elem => result.push(elem))
   result
 }
 
@@ -36,7 +36,7 @@ fn[X] take(
   it : ((X) -> IterResult) -> IterResult raise?,
   n : Int
 ) -> ((X) -> IterResult) -> IterResult raise? {
-  fn (yield_) {
+  yield_ => {
     let mut i = 0
     it(fn (x) {
       if i >= n {
@@ -52,7 +52,7 @@ fn[X, Y] map(
   it : ((X) -> IterResult) -> IterResult raise?,
   f : (X) -> Y raise?
 ) -> ((Y) -> IterResult) -> IterResult raise? {
-  fn (yield_) {
+  yield_ => {
     let mut err_from_f = None
     let result = it(fn (x) {
       try f(x) catch {
@@ -60,7 +60,7 @@ fn[X, Y] map(
           err_from_f = Some(err)
           IterEnd
         }
-      } else {
+      } noraise {
         fx => yield_(fx)
       }
     })
@@ -75,7 +75,7 @@ fn[X, Y] filter_map(
   it : ((X) -> IterResult) -> IterResult raise?,
   f : (X) -> Y? raise?
 ) -> ((Y) -> IterResult) -> IterResult raise? {
-  fn (yield_) {
+  yield_ => {
     let mut err_from_f = None
     let result = it(fn (x) {
       let fx = f(x) catch {
@@ -97,7 +97,7 @@ fn[X, Y] filter_map(
 fn[X] with_last(
   it : ((X) -> IterResult) -> IterResult raise?
 ) -> (((X?, X)) -> IterResult) -> IterResult raise? {
-  fn (yield_) {
+  yield_ => {
     let mut last = None
     it(fn (x) {
       let x0 = last
@@ -125,22 +125,23 @@ fn decode_utf16(
 ) -> ((Char) -> IterResult) -> IterResult raise {
   let it = it
     |> with_last
-    |> filter_map(_, fn (pair) raise {
-      let (last, c) = pair
-      if is_low_surrogate(c) {
-        guard last is Some(c0) && is_high_surrogate(c0) else {
-          raise UnexpectedLowSurrogate
+    |> fn (pairs) { filter_map(pairs, fn (pair) raise {
+        let (last, c) = pair
+        if is_low_surrogate(c) {
+          guard last is Some(c0) && is_high_surrogate(c0) else {
+            raise UnexpectedLowSurrogate
+          }
+          Some(((c0 - 0xD800) << 10) + c - 0xDC00 + 0x10000)
+        } else if last is Some(c0) && is_high_surrogate(c0) {
+          raise MissingLowSurrogate
+        } else if is_high_surrogate(c) {
+          None
+        } else {
+          Some(c)
         }
-        Some(((c0 - 0xD800) << 10) + c - 0xDC00 + 0x10000)
-      } else if last is Some(c0) && is_high_surrogate(c0) {
-        raise MissingLowSurrogate
-      } else if is_high_surrogate(c) {
-        None
-      } else {
-        Some(c)
-      }
-    })
-  map(it, _.unsafe_to_char())
+      })
+    }
+  map(it, it => it.unsafe_to_char())
 }
 
 suberror IncompleteUTF16CodePoint derive(Show)
@@ -148,7 +149,7 @@ suberror IncompleteUTF16CodePoint derive(Show)
 fn bytes_to_utf16_code_points(
   it : ((Byte) -> IterResult) -> IterResult raise
 ) -> ((Int) -> IterResult) -> IterResult raise {
-  fn (yield_) {
+  yield_ => {
     let mut last = None
     let result = it(fn (b) {
       match last {
@@ -207,6 +208,6 @@ fn init {
     |> decode_utf16
     take(it, n) |> collect
   }
-  println(try? run([ "一二", "三四", "五六", "七八", "九十" ].map(@encoding/utf16.encode(_)), 7))
-  println(try? run([ "abcdefghij", "klmnopqrst", "uvwxyz" ].map(@encoding/utf16.encode(_)), 10))
+  println(try? run([ "一二", "三四", "五六", "七八", "九十" ].map(s => @encoding/utf16.encode(s)), 7))
+  println(try? run([ "abcdefghij", "klmnopqrst", "uvwxyz" ].map(s => @encoding/utf16.encode(s)), 10))
 }
diff --git a/test/sync_test/__snapshot__/pipeline_test_error_poly_iter.mbt.tokens.json b/test/sync_test/__snapshot__/pipeline_test_error_poly_iter.mbt.tokens.json
index d19cad20..5d1e4fa7 100644
--- a/test/sync_test/__snapshot__/pipeline_test_error_poly_iter.mbt.tokens.json
+++ b/test/sync_test/__snapshot__/pipeline_test_error_poly_iter.mbt.tokens.json
@@ -932,46 +932,60 @@
     "token": "COMMA",
     "loc": "31:10-31:11"
   },
+  {
+    "token": [
+      "LIDENT",
+      "elem"
+    ],
+    "loc": "31:12-31:16"
+  },
+  {
+    "token": "FAT_ARROW",
+    "loc": "31:17-31:19"
+  },
   {
     "token": [
       "LIDENT",
       "result"
     ],
-    "loc": "31:12-31:18"
+    "loc": "31:20-31:26"
   },
   {
     "token": [
       "DOT_LIDENT",
       "push"
     ],
-    "loc": "31:19-31:23"
+    "loc": "31:27-31:31"
   },
   {
     "token": "LPAREN",
-    "loc": "31:23-31:24"
+    "loc": "31:31-31:32"
   },
   {
-    "token": "UNDERSCORE",
-    "loc": "31:24-31:25"
+    "token": [
+      "LIDENT",
+      "elem"
+    ],
+    "loc": "31:32-31:36"
   },
   {
     "token": "RPAREN",
-    "loc": "31:25-31:26"
+    "loc": "31:36-31:37"
   },
   {
     "token": "RPAREN",
-    "loc": "31:26-31:27"
+    "loc": "31:37-31:38"
   },
   {
     "token": [
       "SEMI",
       false
     ],
-    "loc": "31:27-31:27"
+    "loc": "31:38-31:38"
   },
   {
     "token": "NEWLINE",
-    "loc": "31:27-31:28"
+    "loc": "31:38-31:39"
   },
   {
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+    "loc": "212:50-212:58"
   },
   {
     "token": "RBRACKET",
-    "loc": "211:59-211:60"
+    "loc": "212:59-212:60"
   },
   {
     "token": [
       "DOT_LIDENT",
       "map"
     ],
-    "loc": "211:61-211:64"
+    "loc": "212:61-212:64"
   },
   {
     "token": "LPAREN",
-    "loc": "211:64-211:65"
+    "loc": "212:64-212:65"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "s"
+    ],
+    "loc": "212:65-212:66"
+  },
+  {
+    "token": "FAT_ARROW",
+    "loc": "212:67-212:69"
   },
   {
     "token": [
       "PACKAGE_NAME",
       "encoding/utf16"
     ],
-    "loc": "211:65-211:80"
+    "loc": "212:70-212:85"
   },
   {
     "token": [
       "DOT_LIDENT",
       "encode"
     ],
-    "loc": "211:81-211:87"
+    "loc": "212:86-212:92"
   },
   {
     "token": "LPAREN",
-    "loc": "211:87-211:88"
+    "loc": "212:92-212:93"
   },
   {
-    "token": "UNDERSCORE",
-    "loc": "211:88-211:89"
+    "token": [
+      "LIDENT",
+      "s"
+    ],
+    "loc": "212:93-212:94"
   },
   {
     "token": "RPAREN",
-    "loc": "211:89-211:90"
+    "loc": "212:94-212:95"
   },
   {
     "token": "RPAREN",
-    "loc": "211:90-211:91"
+    "loc": "212:95-212:96"
   },
   {
     "token": "COMMA",
-    "loc": "211:91-211:92"
+    "loc": "212:96-212:97"
   },
   {
     "token": [
       "INT",
       "10"
     ],
-    "loc": "211:93-211:95"
+    "loc": "212:98-212:100"
   },
   {
     "token": "RPAREN",
-    "loc": "211:95-211:96"
+    "loc": "212:100-212:101"
   },
   {
     "token": "RPAREN",
-    "loc": "211:96-211:97"
+    "loc": "212:101-212:102"
   },
   {
     "token": "NEWLINE",
-    "loc": "211:97-211:98"
+    "loc": "212:102-212:103"
   },
   {
     "token": "RBRACE",
-    "loc": "212:1-212:2"
+    "loc": "213:1-213:2"
   },
   {
     "token": [
       "SEMI",
       false
     ],
-    "loc": "212:2-212:2"
+    "loc": "213:2-213:2"
   },
   {
     "token": "NEWLINE",
-    "loc": "212:2-212:3"
+    "loc": "213:2-213:3"
   },
   {
     "token": "EOF",
-    "loc": "213:1-213:1"
+    "loc": "214:1-214:1"
   }
 ]
\ No newline at end of file
diff --git a/test/sync_test/__snapshot__/pipeline_test_error_poly_iter2.json b/test/sync_test/__snapshot__/pipeline_test_error_poly_iter2.json
index eaa2d57f..2ca08392 100644
--- a/test/sync_test/__snapshot__/pipeline_test_error_poly_iter2.json
+++ b/test/sync_test/__snapshot__/pipeline_test_error_poly_iter2.json
@@ -319,46 +319,27 @@
                     ]
                   },
                   "body": {
-                    "kind": "Expr::ForEach",
+                    "kind": "Expr::Group",
                     "loc": null,
                     "children": {
-                      "binders": {
-                        "kind": "Expr::ForEach::BinderList",
-                        "loc": null,
-                        "children": [
-                          {
-                            "kind": "Binder",
-                            "loc": null,
-                            "children": {
-                              "name": "x"
-                            }
-                          }
-                        ]
-                      },
                       "expr": {
-                        "kind": "Expr::Ident",
+                        "kind": "Expr::ForEach",
                         "loc": null,
                         "children": {
-                          "id": {
-                            "kind": "Var",
+                          "binders": {
+                            "kind": "Expr::ForEach::BinderList",
                             "loc": null,
-                            "children": {
-                              "name": {
-                                "kind": "LongIdent::Ident",
+                            "children": [
+                              {
+                                "kind": "Binder",
                                 "loc": null,
                                 "children": {
-                                  "value": "arr"
+                                  "name": "x"
                                 }
                               }
-                            }
-                          }
-                        }
-                      },
-                      "body": {
-                        "kind": "Expr::Apply",
-                        "loc": null,
-                        "children": {
-                          "func": {
+                            ]
+                          },
+                          "expr": {
                             "kind": "Expr::Ident",
                             "loc": null,
                             "children": {
@@ -370,58 +351,88 @@
                                     "kind": "LongIdent::Ident",
                                     "loc": null,
                                     "children": {
-                                      "value": "yield_"
+                                      "value": "arr"
                                     }
                                   }
                                 }
                               }
                             }
                           },
-                          "args": {
-                            "kind": "Expr::Apply::ArgumentList",
+                          "body": {
+                            "kind": "Expr::Apply",
                             "loc": null,
-                            "children": [
-                              {
-                                "kind": "Argument",
+                            "children": {
+                              "func": {
+                                "kind": "Expr::Ident",
                                 "loc": null,
                                 "children": {
-                                  "value": {
-                                    "kind": "Expr::Ident",
+                                  "id": {
+                                    "kind": "Var",
                                     "loc": null,
                                     "children": {
-                                      "id": {
-                                        "kind": "Var",
+                                      "name": {
+                                        "kind": "LongIdent::Ident",
                                         "loc": null,
                                         "children": {
-                                          "name": {
-                                            "kind": "LongIdent::Ident",
+                                          "value": "yield_"
+                                        }
+                                      }
+                                    }
+                                  }
+                                }
+                              },
+                              "args": {
+                                "kind": "Expr::Apply::ArgumentList",
+                                "loc": null,
+                                "children": [
+                                  {
+                                    "kind": "Argument",
+                                    "loc": null,
+                                    "children": {
+                                      "value": {
+                                        "kind": "Expr::Ident",
+                                        "loc": null,
+                                        "children": {
+                                          "id": {
+                                            "kind": "Var",
                                             "loc": null,
                                             "children": {
-                                              "value": "x"
+                                              "name": {
+                                                "kind": "LongIdent::Ident",
+                                                "loc": null,
+                                                "children": {
+                                                  "value": "x"
+                                                }
+                                              }
                                             }
                                           }
                                         }
+                                      },
+                                      "kind": {
+                                        "kind": "ArgumentKind::Positional",
+                                        "loc": null,
+                                        "children": {}
                                       }
                                     }
-                                  },
-                                  "kind": {
-                                    "kind": "ArgumentKind::Positional",
-                                    "loc": null,
-                                    "children": {}
                                   }
-                                }
+                                ]
+                              },
+                              "attr": {
+                                "kind": "ApplyAttr::NoAttr",
+                                "loc": null,
+                                "children": {}
                               }
-                            ]
+                            }
                           },
-                          "attr": {
-                            "kind": "ApplyAttr::NoAttr",
-                            "loc": null,
-                            "children": {}
-                          }
+                          "else_block": null,
+                          "label": null
                         }
                       },
-                      "else_block": null,
-                      "label": null
+                      "group": {
+                        "kind": "Group::Brace",
+                        "loc": null,
+                        "children": {}
+                      }
                     }
                   },
                   "return_type": null,
@@ -431,7 +442,7 @@
                     "children": {}
                   },
                   "kind": {
-                    "kind": "FnKind::Lambda",
+                    "kind": "FnKind::Arrow",
                     "loc": null,
                     "children": {}
                   },
@@ -1324,68 +1335,121 @@
                                 "loc": null,
                                 "children": {
                                   "value": {
-                                    "kind": "Expr::DotApply",
+                                    "kind": "Expr::Function",
                                     "loc": null,
                                     "children": {
-                                      "self": {
-                                        "kind": "Expr::Ident",
+                                      "func": {
+                                        "kind": "Func::Lambda",
                                         "loc": null,
                                         "children": {
-                                          "id": {
-                                            "kind": "Var",
+                                          "parameters": {
+                                            "kind": "Func::Lambda::ParameterList",
                                             "loc": null,
-                                            "children": {
-                                              "name": {
-                                                "kind": "LongIdent::Ident",
+                                            "children": [
+                                              {
+                                                "kind": "Parameter::Positional",
                                                 "loc": null,
                                                 "children": {
-                                                  "value": "result"
+                                                  "binder": {
+                                                    "kind": "Binder",
+                                                    "loc": null,
+                                                    "children": {
+                                                      "name": "elem"
+                                                    }
+                                                  },
+                                                  "ty": null
                                                 }
                                               }
-                                            }
-                                          }
-                                        }
-                                      },
-                                      "method_name": {
-                                        "kind": "Label",
-                                        "loc": null,
-                                        "children": {
-                                          "name": "push"
-                                        }
-                                      },
-                                      "args": {
-                                        "kind": "Expr::DotApply::ArgList",
-                                        "loc": null,
-                                        "children": [
-                                          {
-                                            "kind": "Argument",
+                                            ]
+                                          },
+                                          "body": {
+                                            "kind": "Expr::DotApply",
                                             "loc": null,
                                             "children": {
-                                              "value": {
-                                                "kind": "Expr::Hole",
+                                              "self": {
+                                                "kind": "Expr::Ident",
                                                 "loc": null,
                                                 "children": {
-                                                  "kind": {
-                                                    "kind": "Hole::Incomplete",
+                                                  "id": {
+                                                    "kind": "Var",
                                                     "loc": null,
-                                                    "children": {}
+                                                    "children": {
+                                                      "name": {
+                                                        "kind": "LongIdent::Ident",
+                                                        "loc": null,
+                                                        "children": {
+                                                          "value": "result"
+                                                        }
+                                                      }
+                                                    }
                                                   }
                                                 }
                                               },
-                                              "kind": {
-                                                "kind": "ArgumentKind::Positional",
+                                              "method_name": {
+                                                "kind": "Label",
+                                                "loc": null,
+                                                "children": {
+                                                  "name": "push"
+                                                }
+                                              },
+                                              "args": {
+                                                "kind": "Expr::DotApply::ArgList",
+                                                "loc": null,
+                                                "children": [
+                                                  {
+                                                    "kind": "Argument",
+                                                    "loc": null,
+                                                    "children": {
+                                                      "value": {
+                                                        "kind": "Expr::Ident",
+                                                        "loc": null,
+                                                        "children": {
+                                                          "id": {
+                                                            "kind": "Var",
+                                                            "loc": null,
+                                                            "children": {
+                                                              "name": {
+                                                                "kind": "LongIdent::Ident",
+                                                                "loc": null,
+                                                                "children": {
+                                                                  "value": "elem"
+                                                                }
+                                                              }
+                                                            }
+                                                          }
+                                                        }
+                                                      },
+                                                      "kind": {
+                                                        "kind": "ArgumentKind::Positional",
+                                                        "loc": null,
+                                                        "children": {}
+                                                      }
+                                                    }
+                                                  }
+                                                ]
+                                              },
+                                              "return_self": false,
+                                              "attr": {
+                                                "kind": "ApplyAttr::NoAttr",
                                                 "loc": null,
                                                 "children": {}
                                               }
                                             }
-                                          }
-                                        ]
-                                      },
-                                      "return_self": false,
-                                      "attr": {
-                                        "kind": "ApplyAttr::NoAttr",
-                                        "loc": null,
-                                        "children": {}
+                                          },
+                                          "return_type": null,
+                                          "error_type": {
+                                            "kind": "ErrorType::NoErrorType",
+                                            "loc": null,
+                                            "children": {}
+                                          },
+                                          "kind": {
+                                            "kind": "FnKind::Arrow",
+                                            "loc": null,
+                                            "children": {}
+                                          },
+                                          "has_error": null,
+                                          "is_async": null
+                                        }
                                       }
                                     }
                                   },
@@ -2746,142 +2810,153 @@
                                         ]
                                       },
                                       "body": {
-                                        "kind": "Expr::If",
+                                        "kind": "Expr::Group",
                                         "loc": null,
                                         "children": {
-                                          "cond": {
-                                            "kind": "Expr::Apply",
+                                          "expr": {
+                                            "kind": "Expr::If",
                                             "loc": null,
                                             "children": {
-                                              "func": {
-                                                "kind": "Expr::Ident",
+                                              "cond": {
+                                                "kind": "Expr::Apply",
                                                 "loc": null,
                                                 "children": {
-                                                  "id": {
-                                                    "kind": "Var",
+                                                  "func": {
+                                                    "kind": "Expr::Ident",
                                                     "loc": null,
                                                     "children": {
-                                                      "name": {
-                                                        "kind": "LongIdent::Ident",
+                                                      "id": {
+                                                        "kind": "Var",
                                                         "loc": null,
                                                         "children": {
-                                                          "value": "f"
+                                                          "name": {
+                                                            "kind": "LongIdent::Ident",
+                                                            "loc": null,
+                                                            "children": {
+                                                              "value": "f"
+                                                            }
+                                                          }
                                                         }
                                                       }
                                                     }
-                                                  }
-                                                }
-                                              },
-                                              "args": {
-                                                "kind": "Expr::Apply::ArgumentList",
-                                                "loc": null,
-                                                "children": [
-                                                  {
-                                                    "kind": "Argument",
+                                                  },
+                                                  "args": {
+                                                    "kind": "Expr::Apply::ArgumentList",
                                                     "loc": null,
-                                                    "children": {
-                                                      "value": {
-                                                        "kind": "Expr::Ident",
+                                                    "children": [
+                                                      {
+                                                        "kind": "Argument",
                                                         "loc": null,
                                                         "children": {
-                                                          "id": {
-                                                            "kind": "Var",
+                                                          "value": {
+                                                            "kind": "Expr::Ident",
                                                             "loc": null,
                                                             "children": {
-                                                              "name": {
-                                                                "kind": "LongIdent::Ident",
+                                                              "id": {
+                                                                "kind": "Var",
                                                                 "loc": null,
                                                                 "children": {
-                                                                  "value": "x"
+                                                                  "name": {
+                                                                    "kind": "LongIdent::Ident",
+                                                                    "loc": null,
+                                                                    "children": {
+                                                                      "value": "x"
+                                                                    }
+                                                                  }
                                                                 }
                                                               }
                                                             }
+                                                          },
+                                                          "kind": {
+                                                            "kind": "ArgumentKind::Positional",
+                                                            "loc": null,
+                                                            "children": {}
                                                           }
                                                         }
-                                                      },
-                                                      "kind": {
-                                                        "kind": "ArgumentKind::Positional",
-                                                        "loc": null,
-                                                        "children": {}
                                                       }
-                                                    }
+                                                    ]
+                                                  },
+                                                  "attr": {
+                                                    "kind": "ApplyAttr::NoAttr",
+                                                    "loc": null,
+                                                    "children": {}
                                                   }
-                                                ]
+                                                }
                                               },
-                                              "attr": {
-                                                "kind": "ApplyAttr::NoAttr",
-                                                "loc": null,
-                                                "children": {}
-                                              }
-                                            }
-                                          },
-                                          "ifso": {
-                                            "kind": "Expr::Apply",
-                                            "loc": null,
-                                            "children": {
-                                              "func": {
-                                                "kind": "Expr::Ident",
+                                              "ifso": {
+                                                "kind": "Expr::Apply",
                                                 "loc": null,
                                                 "children": {
-                                                  "id": {
-                                                    "kind": "Var",
+                                                  "func": {
+                                                    "kind": "Expr::Ident",
                                                     "loc": null,
                                                     "children": {
-                                                      "name": {
-                                                        "kind": "LongIdent::Ident",
+                                                      "id": {
+                                                        "kind": "Var",
                                                         "loc": null,
                                                         "children": {
-                                                          "value": "yield_"
+                                                          "name": {
+                                                            "kind": "LongIdent::Ident",
+                                                            "loc": null,
+                                                            "children": {
+                                                              "value": "yield_"
+                                                            }
+                                                          }
                                                         }
                                                       }
                                                     }
-                                                  }
-                                                }
-                                              },
-                                              "args": {
-                                                "kind": "Expr::Apply::ArgumentList",
-                                                "loc": null,
-                                                "children": [
-                                                  {
-                                                    "kind": "Argument",
+                                                  },
+                                                  "args": {
+                                                    "kind": "Expr::Apply::ArgumentList",
                                                     "loc": null,
-                                                    "children": {
-                                                      "value": {
-                                                        "kind": "Expr::Ident",
+                                                    "children": [
+                                                      {
+                                                        "kind": "Argument",
                                                         "loc": null,
                                                         "children": {
-                                                          "id": {
-                                                            "kind": "Var",
+                                                          "value": {
+                                                            "kind": "Expr::Ident",
                                                             "loc": null,
                                                             "children": {
-                                                              "name": {
-                                                                "kind": "LongIdent::Ident",
+                                                              "id": {
+                                                                "kind": "Var",
                                                                 "loc": null,
                                                                 "children": {
-                                                                  "value": "x"
+                                                                  "name": {
+                                                                    "kind": "LongIdent::Ident",
+                                                                    "loc": null,
+                                                                    "children": {
+                                                                      "value": "x"
+                                                                    }
+                                                                  }
                                                                 }
                                                               }
                                                             }
+                                                          },
+                                                          "kind": {
+                                                            "kind": "ArgumentKind::Positional",
+                                                            "loc": null,
+                                                            "children": {}
                                                           }
                                                         }
-                                                      },
-                                                      "kind": {
-                                                        "kind": "ArgumentKind::Positional",
-                                                        "loc": null,
-                                                        "children": {}
                                                       }
-                                                    }
+                                                    ]
+                                                  },
+                                                  "attr": {
+                                                    "kind": "ApplyAttr::NoAttr",
+                                                    "loc": null,
+                                                    "children": {}
                                                   }
-                                                ]
+                                                }
                                               },
-                                              "attr": {
-                                                "kind": "ApplyAttr::NoAttr",
-                                                "loc": null,
-                                                "children": {}
-                                              }
+                                              "ifnot": null
                                             }
                                           },
-                                          "ifnot": null
+                                          "group": {
+                                            "kind": "Group::Brace",
+                                            "loc": null,
+                                            "children": {}
+                                          }
                                         }
                                       },
                                       "return_type": null,
@@ -2891,7 +2966,7 @@
                                         "children": {}
                                       },
                                       "kind": {
-                                        "kind": "FnKind::Lambda",
+                                        "kind": "FnKind::Arrow",
                                         "loc": null,
                                         "children": {}
                                       },
@@ -3400,42 +3475,10 @@
                     ]
                   },
                   "body": {
-                    "kind": "Expr::LetMut",
+                    "kind": "Expr::Group",
                     "loc": null,
                     "children": {
-                      "binder": {
-                        "kind": "Binder",
-                        "loc": null,
-                        "children": {
-                          "name": "err_from_yield"
-                        }
-                      },
-                      "ty": null,
                       "expr": {
-                        "kind": "Expr::Constr",
-                        "loc": null,
-                        "children": {
-                          "constr": {
-                            "kind": "Constructor",
-                            "loc": null,
-                            "children": {
-                              "name": {
-                                "kind": "ConstrName",
-                                "loc": null,
-                                "children": {
-                                  "name": "None"
-                                }
-                              },
-                              "extra_info": {
-                                "kind": "ConstructorExtraInfo::NoExtraInfo",
-                                "loc": null,
-                                "children": {}
-                              }
-                            }
-                          }
-                        }
-                      },
-                      "body": {
                         "kind": "Expr::LetMut",
                         "loc": null,
                         "children": {
@@ -3443,234 +3486,247 @@
                             "kind": "Binder",
                             "loc": null,
                             "children": {
-                              "name": "i"
+                              "name": "err_from_yield"
                             }
                           },
                           "ty": null,
                           "expr": {
-                            "kind": "Expr::Constant",
+                            "kind": "Expr::Constr",
                             "loc": null,
                             "children": {
-                              "constant": {
-                                "kind": "Constant::Int",
+                              "constr": {
+                                "kind": "Constructor",
                                 "loc": null,
                                 "children": {
-                                  "value": "0"
+                                  "name": {
+                                    "kind": "ConstrName",
+                                    "loc": null,
+                                    "children": {
+                                      "name": "None"
+                                    }
+                                  },
+                                  "extra_info": {
+                                    "kind": "ConstructorExtraInfo::NoExtraInfo",
+                                    "loc": null,
+                                    "children": {}
+                                  }
                                 }
                               }
                             }
                           },
                           "body": {
-                            "kind": "Expr::Sequence",
+                            "kind": "Expr::LetMut",
                             "loc": null,
                             "children": {
-                              "exprs": {
-                                "kind": "Expr::Sequence::ExprList",
+                              "binder": {
+                                "kind": "Binder",
                                 "loc": null,
-                                "children": [
-                                  {
-                                    "kind": "Expr::Try",
+                                "children": {
+                                  "name": "i"
+                                }
+                              },
+                              "ty": null,
+                              "expr": {
+                                "kind": "Expr::Constant",
+                                "loc": null,
+                                "children": {
+                                  "constant": {
+                                    "kind": "Constant::Int",
                                     "loc": null,
                                     "children": {
-                                      "body": {
-                                        "kind": "Expr::Apply",
+                                      "value": "0"
+                                    }
+                                  }
+                                }
+                              },
+                              "body": {
+                                "kind": "Expr::Sequence",
+                                "loc": null,
+                                "children": {
+                                  "exprs": {
+                                    "kind": "Expr::Sequence::ExprList",
+                                    "loc": null,
+                                    "children": [
+                                      {
+                                        "kind": "Expr::Try",
                                         "loc": null,
                                         "children": {
-                                          "func": {
-                                            "kind": "Expr::Ident",
+                                          "body": {
+                                            "kind": "Expr::Apply",
                                             "loc": null,
                                             "children": {
-                                              "id": {
-                                                "kind": "Var",
+                                              "func": {
+                                                "kind": "Expr::Ident",
                                                 "loc": null,
                                                 "children": {
-                                                  "name": {
-                                                    "kind": "LongIdent::Ident",
+                                                  "id": {
+                                                    "kind": "Var",
                                                     "loc": null,
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                                                             "children": {
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                                                                 "children": [
                                                                   {
-                                                                    "kind": "Expr::If",
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-                                                                            "kind": "Expr::Ident",
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                                                                                 "children": {
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-                                                                            "children": {
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                                                                                 "loc": null,
                                                                                 "children": {
-                                                                                  "name": {
-                                                                                    "kind": "ConstrName",
+                                                                                  "err_value": {
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                                                                                     "loc": null,
                                                                                     "children": {
-                                                                                      "name": "IterTake"
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+                                                                                        "children": {
+                                                                                          "name": {
+                                                                                            "kind": "ConstrName",
+                                                                                            "loc": null,
+                                                                                            "children": {
+                                                                                              "name": "IterTake"
+                                                                                            }
+                                                                                          },
+                                                                                          "extra_info": {
+                                                                                            "kind": "ConstructorExtraInfo::NoExtraInfo",
+                                                                                            "loc": null,
+                                                                                            "children": {}
+                                                                                          }
+                                                                                        }
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                                                                                     }
-                                                                                  },
-                                                                                  "extra_info": {
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-                                                                                    "loc": null,
-                                                                                    "children": {}
                                                                                   }
                                                                                 }
-                                                                              }
+                                                                              },
+                                                                              "ifnot": null
                                                                             }
                                                                           }
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                                                                       },
-                                                                      "ifnot": null
-                                                                    }
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-                                                                ]
-                                                              },
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-                                                                    "loc": null,
-                                                                    "children": {
-                                                                      "func": {
-                                                                        "kind": "Expr::Ident",
+                                                                      "last_expr": {
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                                                                         "loc": null,
                                                                         "children": {
-                                                                          "id": {
-                                                                            "kind": "Var",
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-                                                                        "children": [
-                                                                          {
-                                                                            "kind": "Argument",
+                                                                          "body": {
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                                                                             "children": {
-                                                                              "value": {
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                                                                                 "kind": "Expr::Ident",
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                                                                                 "children": {
@@ -3682,68 +3738,26 @@
                                                                                         "kind": "LongIdent::Ident",
                                                                                         "loc": null,
                                                                                         "children": {
-                                                                                          "value": "x"
+                                                                                          "value": "yield_"
                                                                                         }
                                                                                       }
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                                                                                   }
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-                                                                            "kind": "Pattern::Var",
-                                                                            "loc": null,
-                                                                            "children": {
-                                                                              "value": {
-                                                                                "kind": "Binder",
+                                                                              "args": {
+                                                                                "kind": "Expr::Apply::ArgumentList",
                                                                                 "loc": null,
-                                                                                "children": {
-                                                                                  "name": "err"
-                                                                                }
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-                                                                                "loc": null,
-                                                                                "children": {
-                                                                                  "exprs": {
-                                                                                    "kind": "Expr::Sequence::ExprList",
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+                                                                                  {
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-                                                                                      {
-                                                                                        "kind": "Expr::Assign",
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@@ -3751,414 +3765,492 @@
                                                                                                 "kind": "LongIdent::Ident",
                                                                                                 "loc": null,
                                                                                                 "children": {
-                                                                                                  "value": "err_from_yield"
+                                                                                                  "value": "x"
                                                                                                 }
                                                                                               }
                                                                                             }
-                                                                                          },
-                                                                                          "expr": {
-                                                                                            "kind": "Expr::Apply",
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+                                                                                        "loc": null,
+                                                                                        "children": {}
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+                                                                              },
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+                                                                                "children": {}
+                                                                              }
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+                                                                              {
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+                                                                                "children": {
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+                                                                                    "children": {
+                                                                                      "value": {
+                                                                                        "kind": "Binder",
+                                                                                        "loc": null,
+                                                                                        "children": {
+                                                                                          "name": "err"
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+                                            "children": [
+                                              {
+                                                "kind": "Case",
                                                 "loc": null,
                                                 "children": {
-                                                  "constr": {
-                                                    "kind": "Constructor",
+                                                  "pattern": {
+                                                    "kind": "Pattern::Constr",
                                                     "loc": null,
                                                     "children": {
-                                                      "name": {
-                                                        "kind": "ConstrName",
+                                                      "constr": {
+                                                        "kind": "Constructor",
                                                         "loc": null,
                                                         "children": {
-                                                          "name": "IterTake"
+                                                          "name": {
+                                                            "kind": "ConstrName",
+                                                            "loc": null,
+                                                            "children": {
+                                                              "name": "IterTake"
+                                                            }
+                                                          },
+                                                          "extra_info": {
+                                                            "kind": "ConstructorExtraInfo::NoExtraInfo",
+                                                            "loc": null,
+                                                            "children": {}
+                                                          }
                                                         }
                                                       },
-                                                      "extra_info": {
-                                                        "kind": "ConstructorExtraInfo::NoExtraInfo",
-                                                        "loc": null,
-                                                        "children": {}
-                                                      }
+                                                      "args": null,
+                                                      "is_open": false
                                                     }
                                                   },
-                                                  "args": null,
-                                                  "is_open": false
+                                                  "guard": null,
+                                                  "body": {
+                                                    "kind": "Expr::Unit",
+                                                    "loc": null,
+                                                    "children": {
+                                                      "faked": false
+                                                    }
+                                                  }
                                                 }
                                               },
-                                              "guard": null,
-                                              "body": {
-                                                "kind": "Expr::Unit",
-                                                "loc": null,
-                                                "children": {
-                                                  "faked": false
-                                                }
-                                              }
-                                            }
-                                          },
-                                          {
-                                            "kind": "Case",
-                                            "loc": null,
-                                            "children": {
-                                              "pattern": {
-                                                "kind": "Pattern::Any",
-                                                "loc": null,
-                                                "children": {}
-                                              },
-                                              "guard": null,
-                                              "body": {
-                                                "kind": "Expr::Apply",
+                                              {
+                                                "kind": "Case",
                                                 "loc": null,
                                                 "children": {
-                                                  "func": {
-                                                    "kind": "Expr::Ident",
+                                                  "pattern": {
+                                                    "kind": "Pattern::Any",
+                                                    "loc": null,
+                                                    "children": {}
+                                                  },
+                                                  "guard": null,
+                                                  "body": {
+                                                    "kind": "Expr::Apply",
                                                     "loc": null,
                                                     "children": {
-                                                      "id": {
-                                                        "kind": "Var",
+                                                      "func": {
+                                                        "kind": "Expr::Ident",
                                                         "loc": null,
                                                         "children": {
-                                                          "name": {
-                                                            "kind": "LongIdent::Ident",
+                                                          "id": {
+                                                            "kind": "Var",
                                                             "loc": null,
                                                             "children": {
-                                                              "value": "panic"
+                                                              "name": {
+                                                                "kind": "LongIdent::Ident",
+                                                                "loc": null,
+                                                                "children": {
+                                                                  "value": "panic"
+                                                                }
+                                                              }
                                                             }
                                                           }
                                                         }
+                                                      },
+                                                      "args": {
+                                                        "kind": "Expr::Apply::ArgumentList",
+                                                        "loc": null,
+                                                        "children": []
+                                                      },
+                                                      "attr": {
+                                                        "kind": "ApplyAttr::NoAttr",
+                                                        "loc": null,
+                                                        "children": {}
                                                       }
                                                     }
-                                                  },
-                                                  "args": {
-                                                    "kind": "Expr::Apply::ArgumentList",
-                                                    "loc": null,
-                                                    "children": []
-                                                  },
-                                                  "attr": {
-                                                    "kind": "ApplyAttr::NoAttr",
-                                                    "loc": null,
-                                                    "children": {}
                                                   }
                                                 }
                                               }
-                                            }
-                                          }
-                                        ]
-                                      },
-                                      "catch_all": false,
-                                      "try_else": null,
-                                      "has_try": false
-                                    }
-                                  }
-                                ]
-                              },
-                              "last_expr": {
-                                "kind": "Expr::Match",
-                                "loc": null,
-                                "children": {
-                                  "expr": {
-                                    "kind": "Expr::Ident",
+                                            ]
+                                          },
+                                          "catch_all": false,
+                                          "try_else": null,
+                                          "has_try": false
+                                        }
+                                      }
+                                    ]
+                                  },
+                                  "last_expr": {
+                                    "kind": "Expr::Match",
                                     "loc": null,
                                     "children": {
-                                      "id": {
-                                        "kind": "Var",
+                                      "expr": {
+                                        "kind": "Expr::Ident",
                                         "loc": null,
                                         "children": {
-                                          "name": {
-                                            "kind": "LongIdent::Ident",
+                                          "id": {
+                                            "kind": "Var",
                                             "loc": null,
                                             "children": {
-                                              "value": "err_from_yield"
+                                              "name": {
+                                                "kind": "LongIdent::Ident",
+                                                "loc": null,
+                                                "children": {
+                                                  "value": "err_from_yield"
+                                                }
+                                              }
                                             }
                                           }
                                         }
-                                      }
-                                    }
-                                  },
-                                  "cases": {
-                                    "kind": "Expr::Match::CaseList",
-                                    "loc": null,
-                                    "children": [
-                                      {
-                                        "kind": "Case",
+                                      },
+                                      "cases": {
+                                        "kind": "Expr::Match::CaseList",
                                         "loc": null,
-                                        "children": {
-                                          "pattern": {
-                                            "kind": "Pattern::Constr",
+                                        "children": [
+                                          {
+                                            "kind": "Case",
                                             "loc": null,
                                             "children": {
-                                              "constr": {
-                                                "kind": "Constructor",
+                                              "pattern": {
+                                                "kind": "Pattern::Constr",
                                                 "loc": null,
                                                 "children": {
-                                                  "name": {
-                                                    "kind": "ConstrName",
+                                                  "constr": {
+                                                    "kind": "Constructor",
                                                     "loc": null,
                                                     "children": {
-                                                      "name": "None"
+                                                      "name": {
+                                                        "kind": "ConstrName",
+                                                        "loc": null,
+                                                        "children": {
+                                                          "name": "None"
+                                                        }
+                                                      },
+                                                      "extra_info": {
+                                                        "kind": "ConstructorExtraInfo::NoExtraInfo",
+                                                        "loc": null,
+                                                        "children": {}
+                                                      }
                                                     }
                                                   },
-                                                  "extra_info": {
-                                                    "kind": "ConstructorExtraInfo::NoExtraInfo",
-                                                    "loc": null,
-                                                    "children": {}
-                                                  }
+                                                  "args": null,
+                                                  "is_open": false
                                                 }
                                               },
-                                              "args": null,
-                                              "is_open": false
+                                              "guard": null,
+                                              "body": {
+                                                "kind": "Expr::Unit",
+                                                "loc": null,
+                                                "children": {
+                                                  "faked": false
+                                                }
+                                              }
                                             }
                                           },
-                                          "guard": null,
-                                          "body": {
-                                            "kind": "Expr::Unit",
-                                            "loc": null,
-                                            "children": {
-                                              "faked": false
-                                            }
-                                          }
-                                        }
-                                      },
-                                      {
-                                        "kind": "Case",
-                                        "loc": null,
-                                        "children": {
-                                          "pattern": {
-                                            "kind": "Pattern::Constr",
+                                          {
+                                            "kind": "Case",
                                             "loc": null,
                                             "children": {
-                                              "constr": {
-                                                "kind": "Constructor",
+                                              "pattern": {
+                                                "kind": "Pattern::Constr",
                                                 "loc": null,
                                                 "children": {
-                                                  "name": {
-                                                    "kind": "ConstrName",
+                                                  "constr": {
+                                                    "kind": "Constructor",
                                                     "loc": null,
                                                     "children": {
-                                                      "name": "Some"
+                                                      "name": {
+                                                        "kind": "ConstrName",
+                                                        "loc": null,
+                                                        "children": {
+                                                          "name": "Some"
+                                                        }
+                                                      },
+                                                      "extra_info": {
+                                                        "kind": "ConstructorExtraInfo::NoExtraInfo",
+                                                        "loc": null,
+                                                        "children": {}
+                                                      }
                                                     }
                                                   },
-                                                  "extra_info": {
-                                                    "kind": "ConstructorExtraInfo::NoExtraInfo",
-                                                    "loc": null,
-                                                    "children": {}
-                                                  }
-                                                }
-                                              },
-                                              "args": {
-                                                "kind": "Pattern::Constr::ArgList",
-                                                "loc": null,
-                                                "children": [
-                                                  {
-                                                    "kind": "ConstrPatArg",
+                                                  "args": {
+                                                    "kind": "Pattern::Constr::ArgList",
                                                     "loc": null,
-                                                    "children": {
-                                                      "pat": {
-                                                        "kind": "Pattern::Var",
+                                                    "children": [
+                                                      {
+                                                        "kind": "ConstrPatArg",
                                                         "loc": null,
                                                         "children": {
-                                                          "value": {
-                                                            "kind": "Binder",
+                                                          "pat": {
+                                                            "kind": "Pattern::Var",
                                                             "loc": null,
                                                             "children": {
-                                                              "name": "err"
+                                                              "value": {
+                                                                "kind": "Binder",
+                                                                "loc": null,
+                                                                "children": {
+                                                                  "name": "err"
+                                                                }
+                                                              }
                                                             }
+                                                          },
+                                                          "kind": {
+                                                            "kind": "ArgumentKind::Positional",
+                                                            "loc": null,
+                                                            "children": {}
                                                           }
                                                         }
-                                                      },
-                                                      "kind": {
-                                                        "kind": "ArgumentKind::Positional",
-                                                        "loc": null,
-                                                        "children": {}
                                                       }
-                                                    }
-                                                  }
-                                                ]
+                                                    ]
+                                                  },
+                                                  "is_open": false
+                                                }
                                               },
-                                              "is_open": false
-                                            }
-                                          },
-                                          "guard": null,
-                                          "body": {
-                                            "kind": "Expr::Raise",
-                                            "loc": null,
-                                            "children": {
-                                              "err_value": {
-                                                "kind": "Expr::Ident",
+                                              "guard": null,
+                                              "body": {
+                                                "kind": "Expr::Raise",
                                                 "loc": null,
                                                 "children": {
-                                                  "id": {
-                                                    "kind": "Var",
+                                                  "err_value": {
+                                                    "kind": "Expr::Ident",
                                                     "loc": null,
                                                     "children": {
-                                                      "name": {
-                                                        "kind": "LongIdent::Ident",
+                                                      "id": {
+                                                        "kind": "Var",
                                                         "loc": null,
                                                         "children": {
-                                                          "value": "err"
+                                                          "name": {
+                                                            "kind": "LongIdent::Ident",
+                                                            "loc": null,
+                                                            "children": {
+                                                              "value": "err"
+                                                            }
+                                                          }
                                                         }
                                                       }
                                                     }
@@ -4167,15 +4259,20 @@
                                               }
                                             }
                                           }
-                                        }
+                                        ]
                                       }
-                                    ]
+                                    }
                                   }
                                 }
                               }
                             }
                           }
                         }
+                      },
+                      "group": {
+                        "kind": "Group::Brace",
+                        "loc": null,
+                        "children": {}
                       }
                     }
                   },
@@ -4186,7 +4283,7 @@
                     "children": {}
                   },
                   "kind": {
-                    "kind": "FnKind::Lambda",
+                    "kind": "FnKind::Arrow",
                     "loc": null,
                     "children": {}
                   },
@@ -4659,209 +4756,220 @@
                                                     ]
                                                   },
                                                   "body": {
-                                                    "kind": "Expr::If",
+                                                    "kind": "Expr::Group",
                                                     "loc": null,
                                                     "children": {
-                                                      "cond": {
-                                                        "kind": "Expr::Apply",
+                                                      "expr": {
+                                                        "kind": "Expr::If",
                                                         "loc": null,
                                                         "children": {
-                                                          "func": {
-                                                            "kind": "Expr::Ident",
+                                                          "cond": {
+                                                            "kind": "Expr::Apply",
                                                             "loc": null,
                                                             "children": {
-                                                              "id": {
-                                                                "kind": "Var",
+                                                              "func": {
+                                                                "kind": "Expr::Ident",
                                                                 "loc": null,
                                                                 "children": {
-                                                                  "name": {
-                                                                    "kind": "LongIdent::Ident",
+                                                                  "id": {
+                                                                    "kind": "Var",
                                                                     "loc": null,
                                                                     "children": {
-                                                                      "value": "f"
+                                                                      "name": {
+                                                                        "kind": "LongIdent::Ident",
+                                                                        "loc": null,
+                                                                        "children": {
+                                                                          "value": "f"
+                                                                        }
+                                                                      }
                                                                     }
                                                                   }
                                                                 }
-                                                              }
-                                                            }
-                                                          },
-                                                          "args": {
-                                                            "kind": "Expr::Apply::ArgumentList",
-                                                            "loc": null,
-                                                            "children": [
-                                                              {
-                                                                "kind": "Argument",
+                                                              },
+                                                              "args": {
+                                                                "kind": "Expr::Apply::ArgumentList",
                                                                 "loc": null,
-                                                                "children": {
-                                                                  "value": {
-                                                                    "kind": "Expr::Ident",
+                                                                "children": [
+                                                                  {
+                                                                    "kind": "Argument",
                                                                     "loc": null,
                                                                     "children": {
-                                                                      "id": {
-                                                                        "kind": "Var",
+                                                                      "value": {
+                                                                        "kind": "Expr::Ident",
                                                                         "loc": null,
                                                                         "children": {
-                                                                          "name": {
-                                                                            "kind": "LongIdent::Ident",
+                                                                          "id": {
+                                                                            "kind": "Var",
                                                                             "loc": null,
                                                                             "children": {
-                                                                              "value": "x"
+                                                                              "name": {
+                                                                                "kind": "LongIdent::Ident",
+                                                                                "loc": null,
+                                                                                "children": {
+                                                                                  "value": "x"
+                                                                                }
+                                                                              }
                                                                             }
                                                                           }
                                                                         }
+                                                                      },
+                                                                      "kind": {
+                                                                        "kind": "ArgumentKind::Positional",
+                                                                        "loc": null,
+                                                                        "children": {}
                                                                       }
                                                                     }
-                                                                  },
-                                                                  "kind": {
-                                                                    "kind": "ArgumentKind::Positional",
-                                                                    "loc": null,
-                                                                    "children": {}
                                                                   }
-                                                                }
+                                                                ]
+                                                              },
+                                                              "attr": {
+                                                                "kind": "ApplyAttr::NoAttr",
+                                                                "loc": null,
+                                                                "children": {}
                                                               }
-                                                            ]
+                                                            }
                                                           },
-                                                          "attr": {
-                                                            "kind": "ApplyAttr::NoAttr",
-                                                            "loc": null,
-                                                            "children": {}
-                                                          }
-                                                        }
-                                                      },
-                                                      "ifso": {
-                                                        "kind": "Expr::Sequence",
-                                                        "loc": null,
-                                                        "children": {
-                                                          "exprs": {
-                                                            "kind": "Expr::Sequence::ExprList",
+                                                          "ifso": {
+                                                            "kind": "Expr::Sequence",
                                                             "loc": null,
-                                                            "children": [
-                                                              {
-                                                                "kind": "Expr::Assign",
+                                                            "children": {
+                                                              "exprs": {
+                                                                "kind": "Expr::Sequence::ExprList",
                                                                 "loc": null,
-                                                                "children": {
-                                                                  "var": {
-                                                                    "kind": "Var",
+                                                                "children": [
+                                                                  {
+                                                                    "kind": "Expr::Assign",
                                                                     "loc": null,
                                                                     "children": {
-                                                                      "name": {
-                                                                        "kind": "LongIdent::Ident",
+                                                                      "var": {
+                                                                        "kind": "Var",
                                                                         "loc": null,
                                                                         "children": {
-                                                                          "value": "result"
+                                                                          "name": {
+                                                                            "kind": "LongIdent::Ident",
+                                                                            "loc": null,
+                                                                            "children": {
+                                                                              "value": "result"
+                                                                            }
+                                                                          }
                                                                         }
-                                                                      }
-                                                                    }
-                                                                  },
-                                                                  "expr": {
-                                                                    "kind": "Expr::Apply",
-                                                                    "loc": null,
-                                                                    "children": {
-                                                                      "func": {
-                                                                        "kind": "Expr::Constr",
+                                                                      },
+                                                                      "expr": {
+                                                                        "kind": "Expr::Apply",
                                                                         "loc": null,
                                                                         "children": {
-                                                                          "constr": {
-                                                                            "kind": "Constructor",
+                                                                          "func": {
+                                                                            "kind": "Expr::Constr",
                                                                             "loc": null,
                                                                             "children": {
-                                                                              "name": {
-                                                                                "kind": "ConstrName",
+                                                                              "constr": {
+                                                                                "kind": "Constructor",
                                                                                 "loc": null,
                                                                                 "children": {
-                                                                                  "name": "Some"
+                                                                                  "name": {
+                                                                                    "kind": "ConstrName",
+                                                                                    "loc": null,
+                                                                                    "children": {
+                                                                                      "name": "Some"
+                                                                                    }
+                                                                                  },
+                                                                                  "extra_info": {
+                                                                                    "kind": "ConstructorExtraInfo::NoExtraInfo",
+                                                                                    "loc": null,
+                                                                                    "children": {}
+                                                                                  }
                                                                                 }
-                                                                              },
-                                                                              "extra_info": {
-                                                                                "kind": "ConstructorExtraInfo::NoExtraInfo",
-                                                                                "loc": null,
-                                                                                "children": {}
                                                                               }
                                                                             }
-                                                                          }
-                                                                        }
-                                                                      },
-                                                                      "args": {
-                                                                        "kind": "Expr::Apply::ArgumentList",
-                                                                        "loc": null,
-                                                                        "children": [
-                                                                          {
-                                                                            "kind": "Argument",
+                                                                          },
+                                                                          "args": {
+                                                                            "kind": "Expr::Apply::ArgumentList",
                                                                             "loc": null,
-                                                                            "children": {
-                                                                              "value": {
-                                                                                "kind": "Expr::Ident",
+                                                                            "children": [
+                                                                              {
+                                                                                "kind": "Argument",
                                                                                 "loc": null,
                                                                                 "children": {
-                                                                                  "id": {
-                                                                                    "kind": "Var",
+                                                                                  "value": {
+                                                                                    "kind": "Expr::Ident",
                                                                                     "loc": null,
                                                                                     "children": {
-                                                                                      "name": {
-                                                                                        "kind": "LongIdent::Ident",
+                                                                                      "id": {
+                                                                                        "kind": "Var",
                                                                                         "loc": null,
                                                                                         "children": {
-                                                                                          "value": "x"
+                                                                                          "name": {
+                                                                                            "kind": "LongIdent::Ident",
+                                                                                            "loc": null,
+                                                                                            "children": {
+                                                                                              "value": "x"
+                                                                                            }
+                                                                                          }
                                                                                         }
                                                                                       }
                                                                                     }
+                                                                                  },
+                                                                                  "kind": {
+                                                                                    "kind": "ArgumentKind::Positional",
+                                                                                    "loc": null,
+                                                                                    "children": {}
                                                                                   }
                                                                                 }
-                                                                              },
-                                                                              "kind": {
-                                                                                "kind": "ArgumentKind::Positional",
-                                                                                "loc": null,
-                                                                                "children": {}
                                                                               }
-                                                                            }
+                                                                            ]
+                                                                          },
+                                                                          "attr": {
+                                                                            "kind": "ApplyAttr::NoAttr",
+                                                                            "loc": null,
+                                                                            "children": {}
                                                                           }
-                                                                        ]
+                                                                        }
                                                                       },
-                                                                      "attr": {
-                                                                        "kind": "ApplyAttr::NoAttr",
-                                                                        "loc": null,
-                                                                        "children": {}
-                                                                      }
+                                                                      "augmented_by": null
                                                                     }
-                                                                  },
-                                                                  "augmented_by": null
-                                                                }
-                                                              }
-                                                            ]
-                                                          },
-                                                          "last_expr": {
-                                                            "kind": "Expr::Raise",
-                                                            "loc": null,
-                                                            "children": {
-                                                              "err_value": {
-                                                                "kind": "Expr::Constr",
+                                                                  }
+                                                                ]
+                                                              },
+                                                              "last_expr": {
+                                                                "kind": "Expr::Raise",
                                                                 "loc": null,
                                                                 "children": {
-                                                                  "constr": {
-                                                                    "kind": "Constructor",
+                                                                  "err_value": {
+                                                                    "kind": "Expr::Constr",
                                                                     "loc": null,
                                                                     "children": {
-                                                                      "name": {
-                                                                        "kind": "ConstrName",
+                                                                      "constr": {
+                                                                        "kind": "Constructor",
                                                                         "loc": null,
                                                                         "children": {
-                                                                          "name": "IterFind"
+                                                                          "name": {
+                                                                            "kind": "ConstrName",
+                                                                            "loc": null,
+                                                                            "children": {
+                                                                              "name": "IterFind"
+                                                                            }
+                                                                          },
+                                                                          "extra_info": {
+                                                                            "kind": "ConstructorExtraInfo::NoExtraInfo",
+                                                                            "loc": null,
+                                                                            "children": {}
+                                                                          }
                                                                         }
-                                                                      },
-                                                                      "extra_info": {
-                                                                        "kind": "ConstructorExtraInfo::NoExtraInfo",
-                                                                        "loc": null,
-                                                                        "children": {}
                                                                       }
                                                                     }
                                                                   }
                                                                 }
                                                               }
                                                             }
-                                                          }
+                                                          },
+                                                          "ifnot": null
                                                         }
                                                       },
-                                                      "ifnot": null
+                                                      "group": {
+                                                        "kind": "Group::Brace",
+                                                        "loc": null,
+                                                        "children": {}
+                                                      }
                                                     }
                                                   },
                                                   "return_type": null,
@@ -4871,7 +4979,7 @@
                                                     "children": {}
                                                   },
                                                   "kind": {
-                                                    "kind": "FnKind::Lambda",
+                                                    "kind": "FnKind::Arrow",
                                                     "loc": null,
                                                     "children": {}
                                                   },
diff --git a/test/sync_test/__snapshot__/pipeline_test_error_poly_iter2.mbt b/test/sync_test/__snapshot__/pipeline_test_error_poly_iter2.mbt
index 20f06102..8bc7f750 100644
--- a/test/sync_test/__snapshot__/pipeline_test_error_poly_iter2.mbt
+++ b/test/sync_test/__snapshot__/pipeline_test_error_poly_iter2.mbt
@@ -8,7 +8,7 @@
 pub fn[X] from_array(arr : Array[X]) -> (
   (X) -> Unit raise?
 ) -> Unit raise? {
-  fn (yield_) {
+  yield_ => {
     for x in arr {
       yield_(x)
     }
@@ -26,7 +26,7 @@ pub fn[X] collect(
   it : ((X) -> Unit raise?) -> Unit raise?
 ) -> Array[X] raise? {
   let result = []
-  each(it, result.push(_))
+  each(it, elem => result.push(elem))
   result
 }
 
@@ -41,7 +41,7 @@ pub fn[X] filter(
   it : ((X) -> Unit raise?) -> Unit raise?,
   f : (X) -> Bool
 ) -> ((X) -> Unit raise?) -> Unit raise? {
-  yield_ => it(fn (x) {
+  yield_ => it(x => {
     if f(x) {
       yield_(x)
     }
@@ -54,10 +54,10 @@ pub fn[X] take(
   it : ((X) -> Unit raise) -> Unit raise,
   n : Int
 ) -> ((X) -> Unit raise?) -> Unit raise? {
-  fn (yield_) {
+  yield_ => {
     let mut err_from_yield = None
     let mut i = 0
-    it(fn (x) {
+    it(x => {
       if i > n { raise IterTake }
       try yield_(x) catch {
         err => {
@@ -91,7 +91,7 @@ pub fn[X] find(
 ) -> X? {
   let mut result = None
   try {
-    it(fn (x) {
+    it(x => {
       if f(x) {
         result = Some(x)
         raise IterFind
diff --git a/test/sync_test/__snapshot__/pipeline_test_error_poly_iter2.mbt.tokens.json b/test/sync_test/__snapshot__/pipeline_test_error_poly_iter2.mbt.tokens.json
index 2be208a9..c2c0532d 100644
--- a/test/sync_test/__snapshot__/pipeline_test_error_poly_iter2.mbt.tokens.json
+++ b/test/sync_test/__snapshot__/pipeline_test_error_poly_iter2.mbt.tokens.json
@@ -264,32 +264,24 @@
     "token": "NEWLINE",
     "loc": "10:19-10:20"
   },
-  {
-    "token": "FN",
-    "loc": "11:3-11:5"
-  },
-  {
-    "token": "LPAREN",
-    "loc": "11:6-11:7"
-  },
   {
     "token": [
       "LIDENT",
       "yield_"
     ],
-    "loc": "11:7-11:13"
+    "loc": "11:3-11:9"
   },
   {
-    "token": "RPAREN",
-    "loc": "11:13-11:14"
+    "token": "FAT_ARROW",
+    "loc": "11:10-11:12"
   },
   {
     "token": "LBRACE",
-    "loc": "11:15-11:16"
+    "loc": "11:13-11:14"
   },
   {
     "token": "NEWLINE",
-    "loc": "11:16-11:17"
+    "loc": "11:14-11:15"
   },
   {
     "token": "FOR",
@@ -841,46 +833,60 @@
     "token": "COMMA",
     "loc": "29:10-29:11"
   },
+  {
+    "token": [
+      "LIDENT",
+      "elem"
+    ],
+    "loc": "29:12-29:16"
+  },
+  {
+    "token": "FAT_ARROW",
+    "loc": "29:17-29:19"
+  },
   {
     "token": [
       "LIDENT",
       "result"
     ],
-    "loc": "29:12-29:18"
+    "loc": "29:20-29:26"
   },
   {
     "token": [
       "DOT_LIDENT",
       "push"
     ],
-    "loc": "29:19-29:23"
+    "loc": "29:27-29:31"
   },
   {
     "token": "LPAREN",
-    "loc": "29:23-29:24"
+    "loc": "29:31-29:32"
   },
   {
-    "token": "UNDERSCORE",
-    "loc": "29:24-29:25"
+    "token": [
+      "LIDENT",
+      "elem"
+    ],
+    "loc": "29:32-29:36"
   },
   {
     "token": "RPAREN",
-    "loc": "29:25-29:26"
+    "loc": "29:36-29:37"
   },
   {
     "token": "RPAREN",
-    "loc": "29:26-29:27"
+    "loc": "29:37-29:38"
   },
   {
     "token": [
       "SEMI",
       false
     ],
-    "loc": "29:27-29:27"
+    "loc": "29:38-29:38"
   },
   {
     "token": "NEWLINE",
-    "loc": "29:27-29:28"
+    "loc": "29:38-29:39"
   },
   {
     "token": [
@@ -1514,32 +1520,24 @@
     "token": "LPAREN",
     "loc": "44:15-44:16"
   },
-  {
-    "token": "FN",
-    "loc": "44:16-44:18"
-  },
-  {
-    "token": "LPAREN",
-    "loc": "44:19-44:20"
-  },
   {
     "token": [
       "LIDENT",
       "x"
     ],
-    "loc": "44:20-44:21"
+    "loc": "44:16-44:17"
   },
   {
-    "token": "RPAREN",
-    "loc": "44:21-44:22"
+    "token": "FAT_ARROW",
+    "loc": "44:18-44:20"
   },
   {
     "token": "LBRACE",
-    "loc": "44:23-44:24"
+    "loc": "44:21-44:22"
   },
   {
     "token": "NEWLINE",
-    "loc": "44:24-44:25"
+    "loc": "44:22-44:23"
   },
   {
     "token": "IF",
@@ -1879,32 +1877,24 @@
     "token": "NEWLINE",
     "loc": "56:43-56:44"
   },
-  {
-    "token": "FN",
-    "loc": "57:3-57:5"
-  },
-  {
-    "token": "LPAREN",
-    "loc": "57:6-57:7"
-  },
   {
     "token": [
       "LIDENT",
       "yield_"
     ],
-    "loc": "57:7-57:13"
+    "loc": "57:3-57:9"
   },
   {
-    "token": "RPAREN",
-    "loc": "57:13-57:14"
+    "token": "FAT_ARROW",
+    "loc": "57:10-57:12"
   },
   {
     "token": "LBRACE",
-    "loc": "57:15-57:16"
+    "loc": "57:13-57:14"
   },
   {
     "token": "NEWLINE",
-    "loc": "57:16-57:17"
+    "loc": "57:14-57:15"
   },
   {
     "token": "LET",
@@ -1991,32 +1981,24 @@
     "token": "LPAREN",
     "loc": "60:7-60:8"
   },
-  {
-    "token": "FN",
-    "loc": "60:8-60:10"
-  },
-  {
-    "token": "LPAREN",
-    "loc": "60:11-60:12"
-  },
   {
     "token": [
       "LIDENT",
       "x"
     ],
-    "loc": "60:12-60:13"
+    "loc": "60:8-60:9"
   },
   {
-    "token": "RPAREN",
-    "loc": "60:13-60:14"
+    "token": "FAT_ARROW",
+    "loc": "60:10-60:12"
   },
   {
     "token": "LBRACE",
-    "loc": "60:15-60:16"
+    "loc": "60:13-60:14"
   },
   {
     "token": "NEWLINE",
-    "loc": "60:16-60:17"
+    "loc": "60:14-60:15"
   },
   {
     "token": "IF",
@@ -2820,32 +2802,24 @@
     "token": "LPAREN",
     "loc": "94:7-94:8"
   },
-  {
-    "token": "FN",
-    "loc": "94:8-94:10"
-  },
-  {
-    "token": "LPAREN",
-    "loc": "94:11-94:12"
-  },
   {
     "token": [
       "LIDENT",
       "x"
     ],
-    "loc": "94:12-94:13"
+    "loc": "94:8-94:9"
   },
   {
-    "token": "RPAREN",
-    "loc": "94:13-94:14"
+    "token": "FAT_ARROW",
+    "loc": "94:10-94:12"
   },
   {
     "token": "LBRACE",
-    "loc": "94:15-94:16"
+    "loc": "94:13-94:14"
   },
   {
     "token": "NEWLINE",
-    "loc": "94:16-94:17"
+    "loc": "94:14-94:15"
   },
   {
     "token": "IF",
diff --git a/test/sync_test/__snapshot__/pipeline_test_error_polymorphism.json b/test/sync_test/__snapshot__/pipeline_test_error_polymorphism.json
index 395f07a3..6d125a1d 100644
--- a/test/sync_test/__snapshot__/pipeline_test_error_polymorphism.json
+++ b/test/sync_test/__snapshot__/pipeline_test_error_polymorphism.json
@@ -1105,27 +1105,14 @@
                                 ]
                               },
                               "body": {
-                                "kind": "Expr::If",
+                                "kind": "Expr::Group",
                                 "loc": null,
                                 "children": {
-                                  "cond": {
-                                    "kind": "Expr::Infix",
+                                  "expr": {
+                                    "kind": "Expr::If",
                                     "loc": null,
                                     "children": {
-                                      "op": {
-                                        "kind": "Var",
-                                        "loc": null,
-                                        "children": {
-                                          "name": {
-                                            "kind": "LongIdent::Ident",
-                                            "loc": null,
-                                            "children": {
-                                              "value": "=="
-                                            }
-                                          }
-                                        }
-                                      },
-                                      "lhs": {
+                                      "cond": {
                                         "kind": "Expr::Infix",
                                         "loc": null,
                                         "children": {
@@ -1137,16 +1124,16 @@
                                                 "kind": "LongIdent::Ident",
                                                 "loc": null,
                                                 "children": {
-                                                  "value": "%"
+                                                  "value": "=="
                                                 }
                                               }
                                             }
                                           },
                                           "lhs": {
-                                            "kind": "Expr::Ident",
+                                            "kind": "Expr::Infix",
                                             "loc": null,
                                             "children": {
-                                              "id": {
+                                              "op": {
                                                 "kind": "Var",
                                                 "loc": null,
                                                 "children": {
@@ -1154,7 +1141,39 @@
                                                     "kind": "LongIdent::Ident",
                                                     "loc": null,
                                                     "children": {
-                                                      "value": "x"
+                                                      "value": "%"
+                                                    }
+                                                  }
+                                                }
+                                              },
+                                              "lhs": {
+                                                "kind": "Expr::Ident",
+                                                "loc": null,
+                                                "children": {
+                                                  "id": {
+                                                    "kind": "Var",
+                                                    "loc": null,
+                                                    "children": {
+                                                      "name": {
+                                                        "kind": "LongIdent::Ident",
+                                                        "loc": null,
+                                                        "children": {
+                                                          "value": "x"
+                                                        }
+                                                      }
+                                                    }
+                                                  }
+                                                }
+                                              },
+                                              "rhs": {
+                                                "kind": "Expr::Constant",
+                                                "loc": null,
+                                                "children": {
+                                                  "constant": {
+                                                    "kind": "Constant::Int",
+                                                    "loc": null,
+                                                    "children": {
+                                                      "value": "2"
                                                     }
                                                   }
                                                 }
@@ -1169,55 +1188,108 @@
                                                 "kind": "Constant::Int",
                                                 "loc": null,
                                                 "children": {
-                                                  "value": "2"
+                                                  "value": "0"
                                                 }
                                               }
                                             }
                                           }
                                         }
                                       },
-                                      "rhs": {
-                                        "kind": "Expr::Constant",
+                                      "ifso": {
+                                        "kind": "Expr::Raise",
                                         "loc": null,
                                         "children": {
-                                          "constant": {
-                                            "kind": "Constant::Int",
+                                          "err_value": {
+                                            "kind": "Expr::Apply",
                                             "loc": null,
                                             "children": {
-                                              "value": "0"
+                                              "func": {
+                                                "kind": "Expr::Constr",
+                                                "loc": null,
+                                                "children": {
+                                                  "constr": {
+                                                    "kind": "Constructor",
+                                                    "loc": null,
+                                                    "children": {
+                                                      "name": {
+                                                        "kind": "ConstrName",
+                                                        "loc": null,
+                                                        "children": {
+                                                          "name": "MyErr"
+                                                        }
+                                                      },
+                                                      "extra_info": {
+                                                        "kind": "ConstructorExtraInfo::NoExtraInfo",
+                                                        "loc": null,
+                                                        "children": {}
+                                                      }
+                                                    }
+                                                  }
+                                                }
+                                              },
+                                              "args": {
+                                                "kind": "Expr::Apply::ArgumentList",
+                                                "loc": null,
+                                                "children": [
+                                                  {
+                                                    "kind": "Argument",
+                                                    "loc": null,
+                                                    "children": {
+                                                      "value": {
+                                                        "kind": "Expr::Ident",
+                                                        "loc": null,
+                                                        "children": {
+                                                          "id": {
+                                                            "kind": "Var",
+                                                            "loc": null,
+                                                            "children": {
+                                                              "name": {
+                                                                "kind": "LongIdent::Ident",
+                                                                "loc": null,
+                                                                "children": {
+                                                                  "value": "x"
+                                                                }
+                                                              }
+                                                            }
+                                                          }
+                                                        }
+                                                      },
+                                                      "kind": {
+                                                        "kind": "ArgumentKind::Positional",
+                                                        "loc": null,
+                                                        "children": {}
+                                                      }
+                                                    }
+                                                  }
+                                                ]
+                                              },
+                                              "attr": {
+                                                "kind": "ApplyAttr::NoAttr",
+                                                "loc": null,
+                                                "children": {}
+                                              }
                                             }
                                           }
                                         }
-                                      }
-                                    }
-                                  },
-                                  "ifso": {
-                                    "kind": "Expr::Raise",
-                                    "loc": null,
-                                    "children": {
-                                      "err_value": {
+                                      },
+                                      "ifnot": {
                                         "kind": "Expr::Apply",
                                         "loc": null,
                                         "children": {
                                           "func": {
-                                            "kind": "Expr::Constr",
+                                            "kind": "Expr::Ident",
                                             "loc": null,
                                             "children": {
-                                              "constr": {
-                                                "kind": "Constructor",
+                                              "id": {
+                                                "kind": "Var",
                                                 "loc": null,
                                                 "children": {
                                                   "name": {
-                                                    "kind": "ConstrName",
+                                                    "kind": "LongIdent::Ident",
                                                     "loc": null,
                                                     "children": {
-                                                      "name": "MyErr"
+                                                      "value": "println"
                                                     }
-                                                  },
-                                                  "extra_info": {
-                                                    "kind": "ConstructorExtraInfo::NoExtraInfo",
-                                                    "loc": null,
-                                                    "children": {}
                                                   }
                                                 }
                                               }
@@ -1268,71 +1340,10 @@
                                       }
                                     }
                                   },
-                                  "ifnot": {
-                                    "kind": "Expr::Apply",
+                                  "group": {
+                                    "kind": "Group::Brace",
                                     "loc": null,
-                                    "children": {
-                                      "func": {
-                                        "kind": "Expr::Ident",
-                                        "loc": null,
-                                        "children": {
-                                          "id": {
-                                            "kind": "Var",
-                                            "loc": null,
-                                            "children": {
-                                              "name": {
-                                                "kind": "LongIdent::Ident",
-                                                "loc": null,
-                                                "children": {
-                                                  "value": "println"
-                                                }
-                                              }
-                                            }
-                                          }
-                                        }
-                                      },
-                                      "args": {
-                                        "kind": "Expr::Apply::ArgumentList",
-                                        "loc": null,
-                                        "children": [
-                                          {
-                                            "kind": "Argument",
-                                            "loc": null,
-                                            "children": {
-                                              "value": {
-                                                "kind": "Expr::Ident",
-                                                "loc": null,
-                                                "children": {
-                                                  "id": {
-                                                    "kind": "Var",
-                                                    "loc": null,
-                                                    "children": {
-                                                      "name": {
-                                                        "kind": "LongIdent::Ident",
-                                                        "loc": null,
-                                                        "children": {
-                                                          "value": "x"
-                                                        }
-                                                      }
-                                                    }
-                                                  }
-                                                }
-                                              },
-                                              "kind": {
-                                                "kind": "ArgumentKind::Positional",
-                                                "loc": null,
-                                                "children": {}
-                                              }
-                                            }
-                                          }
-                                        ]
-                                      },
-                                      "attr": {
-                                        "kind": "ApplyAttr::NoAttr",
-                                        "loc": null,
-                                        "children": {}
-                                      }
-                                    }
+                                    "children": {}
                                   }
                                 }
                               },
@@ -1343,7 +1354,7 @@
                                 "children": {}
                               },
                               "kind": {
-                                "kind": "FnKind::Lambda",
+                                "kind": "FnKind::Arrow",
                                 "loc": null,
                                 "children": {}
                               },
@@ -2154,7 +2165,7 @@
                                                         "children": {}
                                                       },
                                                       "kind": {
-                                                        "kind": "FnKind::Lambda",
+                                                        "kind": "FnKind::Arrow",
                                                         "loc": null,
                                                         "children": {}
                                                       },
@@ -3168,27 +3179,14 @@
                                             ]
                                           },
                                           "body": {
-                                            "kind": "Expr::If",
+                                            "kind": "Expr::Group",
                                             "loc": null,
                                             "children": {
-                                              "cond": {
-                                                "kind": "Expr::Infix",
+                                              "expr": {
+                                                "kind": "Expr::If",
                                                 "loc": null,
                                                 "children": {
-                                                  "op": {
-                                                    "kind": "Var",
-                                                    "loc": null,
-                                                    "children": {
-                                                      "name": {
-                                                        "kind": "LongIdent::Ident",
-                                                        "loc": null,
-                                                        "children": {
-                                                          "value": "=="
-                                                        }
-                                                      }
-                                                    }
-                                                  },
-                                                  "lhs": {
+                                                  "cond": {
                                                     "kind": "Expr::Infix",
                                                     "loc": null,
                                                     "children": {
@@ -3200,16 +3198,16 @@
                                                             "kind": "LongIdent::Ident",
                                                             "loc": null,
                                                             "children": {
-                                                              "value": "%"
+                                                              "value": "=="
                                                             }
                                                           }
                                                         }
                                                       },
                                                       "lhs": {
-                                                        "kind": "Expr::Ident",
+                                                        "kind": "Expr::Infix",
                                                         "loc": null,
                                                         "children": {
-                                                          "id": {
+                                                          "op": {
                                                             "kind": "Var",
                                                             "loc": null,
                                                             "children": {
@@ -3217,7 +3215,39 @@
                                                                 "kind": "LongIdent::Ident",
                                                                 "loc": null,
                                                                 "children": {
-                                                                  "value": "x"
+                                                                  "value": "%"
+                                                                }
+                                                              }
+                                                            }
+                                                          },
+                                                          "lhs": {
+                                                            "kind": "Expr::Ident",
+                                                            "loc": null,
+                                                            "children": {
+                                                              "id": {
+                                                                "kind": "Var",
+                                                                "loc": null,
+                                                                "children": {
+                                                                  "name": {
+                                                                    "kind": "LongIdent::Ident",
+                                                                    "loc": null,
+                                                                    "children": {
+                                                                      "value": "x"
+                                                                    }
+                                                                  }
+                                                                }
+                                                              }
+                                                            }
+                                                          },
+                                                          "rhs": {
+                                                            "kind": "Expr::Constant",
+                                                            "loc": null,
+                                                            "children": {
+                                                              "constant": {
+                                                                "kind": "Constant::Int",
+                                                                "loc": null,
+                                                                "children": {
+                                                                  "value": "2"
                                                                 }
                                                               }
                                                             }
@@ -3232,106 +3262,98 @@
                                                             "kind": "Constant::Int",
                                                             "loc": null,
                                                             "children": {
-                                                              "value": "2"
+                                                              "value": "0"
                                                             }
                                                           }
                                                         }
                                                       }
                                                     }
                                                   },
-                                                  "rhs": {
-                                                    "kind": "Expr::Constant",
+                                                  "ifso": {
+                                                    "kind": "Expr::Raise",
                                                     "loc": null,
                                                     "children": {
-                                                      "constant": {
-                                                        "kind": "Constant::Int",
+                                                      "err_value": {
+                                                        "kind": "Expr::Apply",
                                                         "loc": null,
                                                         "children": {
-                                                          "value": "0"
-                                                        }
-                                                      }
-                                                    }
-                                                  }
-                                                }
-                                              },
-                                              "ifso": {
-                                                "kind": "Expr::Raise",
-                                                "loc": null,
-                                                "children": {
-                                                  "err_value": {
-                                                    "kind": "Expr::Apply",
-                                                    "loc": null,
-                                                    "children": {
-                                                      "func": {
-                                                        "kind": "Expr::Constr",
-                                                        "loc": null,
-                                                        "children": {
-                                                          "constr": {
-                                                            "kind": "Constructor",
+                                                          "func": {
+                                                            "kind": "Expr::Constr",
                                                             "loc": null,
                                                             "children": {
-                                                              "name": {
-                                                                "kind": "ConstrName",
+                                                              "constr": {
+                                                                "kind": "Constructor",
                                                                 "loc": null,
                                                                 "children": {
-                                                                  "name": "MyErr"
+                                                                  "name": {
+                                                                    "kind": "ConstrName",
+                                                                    "loc": null,
+                                                                    "children": {
+                                                                      "name": "MyErr"
+                                                                    }
+                                                                  },
+                                                                  "extra_info": {
+                                                                    "kind": "ConstructorExtraInfo::NoExtraInfo",
+                                                                    "loc": null,
+                                                                    "children": {}
+                                                                  }
                                                                 }
-                                                              },
-                                                              "extra_info": {
-                                                                "kind": "ConstructorExtraInfo::NoExtraInfo",
-                                                                "loc": null,
-                                                                "children": {}
                                                               }
                                                             }
-                                                          }
-                                                        }
-                                                      },
-                                                      "args": {
-                                                        "kind": "Expr::Apply::ArgumentList",
-                                                        "loc": null,
-                                                        "children": [
-                                                          {
-                                                            "kind": "Argument",
+                                                          },
+                                                          "args": {
+                                                            "kind": "Expr::Apply::ArgumentList",
                                                             "loc": null,
-                                                            "children": {
-                                                              "value": {
-                                                                "kind": "Expr::Ident",
+                                                            "children": [
+                                                              {
+                                                                "kind": "Argument",
                                                                 "loc": null,
                                                                 "children": {
-                                                                  "id": {
-                                                                    "kind": "Var",
+                                                                  "value": {
+                                                                    "kind": "Expr::Ident",
                                                                     "loc": null,
                                                                     "children": {
-                                                                      "name": {
-                                                                        "kind": "LongIdent::Ident",
+                                                                      "id": {
+                                                                        "kind": "Var",
                                                                         "loc": null,
                                                                         "children": {
-                                                                          "value": "x"
+                                                                          "name": {
+                                                                            "kind": "LongIdent::Ident",
+                                                                            "loc": null,
+                                                                            "children": {
+                                                                              "value": "x"
+                                                                            }
+                                                                          }
                                                                         }
                                                                       }
                                                                     }
+                                                                  },
+                                                                  "kind": {
+                                                                    "kind": "ArgumentKind::Positional",
+                                                                    "loc": null,
+                                                                    "children": {}
                                                                   }
                                                                 }
-                                                              },
-                                                              "kind": {
-                                                                "kind": "ArgumentKind::Positional",
-                                                                "loc": null,
-                                                                "children": {}
                                                               }
-                                                            }
+                                                            ]
+                                                          },
+                                                          "attr": {
+                                                            "kind": "ApplyAttr::NoAttr",
+                                                            "loc": null,
+                                                            "children": {}
                                                           }
-                                                        ]
-                                                      },
-                                                      "attr": {
-                                                        "kind": "ApplyAttr::NoAttr",
-                                                        "loc": null,
-                                                        "children": {}
+                                                        }
                                                       }
                                                     }
-                                                  }
+                                                  },
+                                                  "ifnot": null
                                                 }
                                               },
-                                              "ifnot": null
+                                              "group": {
+                                                "kind": "Group::Brace",
+                                                "loc": null,
+                                                "children": {}
+                                              }
                                             }
                                           },
                                           "return_type": null,
@@ -3341,7 +3363,7 @@
                                             "children": {}
                                           },
                                           "kind": {
-                                            "kind": "FnKind::Lambda",
+                                            "kind": "FnKind::Arrow",
                                             "loc": null,
                                             "children": {}
                                           },
diff --git a/test/sync_test/__snapshot__/pipeline_test_error_polymorphism.mbt b/test/sync_test/__snapshot__/pipeline_test_error_polymorphism.mbt
index 74a249c6..322852f8 100644
--- a/test/sync_test/__snapshot__/pipeline_test_error_polymorphism.mbt
+++ b/test/sync_test/__snapshot__/pipeline_test_error_polymorphism.mbt
@@ -18,7 +18,7 @@ fn init {
 }
 
 fn has_error() -> Unit raise {
-  each([ 1, 2, 3 ], fn (x) {
+  each([ 1, 2, 3 ], x => {
     if x % 2 == 0 {
       raise MyErr(x)
     } else {
@@ -42,7 +42,7 @@ fn rethrow(f : () -> Int raise?) -> Int raise? {
 
 fn init {
   println("===")
-  println(try? rethrow(fn () { raise MyErr(42) }))
+  println(try? rethrow(() => raise MyErr(42)))
   println(rethrow(fn () { 42 }))
 }
 
@@ -60,7 +60,7 @@ fn no_error_in_array(arr : Array[Int], f : (Int) -> Unit raise?) -> Int {
 
 fn init {
   println("===")
-  no_error_in_array([ 1, 2, 3, 4 ], fn (x) {
+  no_error_in_array([ 1, 2, 3, 4 ], x => {
     if x % 2 == 0 {
       raise MyErr(x)
     }
diff --git a/test/sync_test/__snapshot__/pipeline_test_error_polymorphism.mbt.tokens.json b/test/sync_test/__snapshot__/pipeline_test_error_polymorphism.mbt.tokens.json
index 511332dc..d18e53f0 100644
--- a/test/sync_test/__snapshot__/pipeline_test_error_polymorphism.mbt.tokens.json
+++ b/test/sync_test/__snapshot__/pipeline_test_error_polymorphism.mbt.tokens.json
@@ -616,32 +616,24 @@
     "token": "COMMA",
     "loc": "21:19-21:20"
   },
-  {
-    "token": "FN",
-    "loc": "21:21-21:23"
-  },
-  {
-    "token": "LPAREN",
-    "loc": "21:24-21:25"
-  },
   {
     "token": [
       "LIDENT",
       "x"
     ],
-    "loc": "21:25-21:26"
+    "loc": "21:21-21:22"
   },
   {
-    "token": "RPAREN",
-    "loc": "21:26-21:27"
+    "token": "FAT_ARROW",
+    "loc": "21:23-21:25"
   },
   {
     "token": "LBRACE",
-    "loc": "21:28-21:29"
+    "loc": "21:26-21:27"
   },
   {
     "token": "NEWLINE",
-    "loc": "21:29-21:30"
+    "loc": "21:27-21:28"
   },
   {
     "token": "IF",
@@ -1176,70 +1168,62 @@
     "token": "LPAREN",
     "loc": "45:23-45:24"
   },
-  {
-    "token": "FN",
-    "loc": "45:24-45:26"
-  },
   {
     "token": "LPAREN",
-    "loc": "45:27-45:28"
+    "loc": "45:24-45:25"
   },
   {
     "token": "RPAREN",
-    "loc": "45:28-45:29"
+    "loc": "45:25-45:26"
   },
   {
-    "token": "LBRACE",
-    "loc": "45:30-45:31"
+    "token": "FAT_ARROW",
+    "loc": "45:27-45:29"
   },
   {
     "token": "RAISE",
-    "loc": "45:32-45:37"
+    "loc": "45:30-45:35"
   },
   {
     "token": [
       "UIDENT",
       "MyErr"
     ],
-    "loc": "45:38-45:43"
+    "loc": "45:36-45:41"
   },
   {
     "token": "LPAREN",
-    "loc": "45:43-45:44"
+    "loc": "45:41-45:42"
   },
   {
     "token": [
       "INT",
       "42"
     ],
-    "loc": "45:44-45:46"
+    "loc": "45:42-45:44"
   },
   {
     "token": "RPAREN",
-    "loc": "45:46-45:47"
-  },
-  {
-    "token": "RBRACE",
-    "loc": "45:48-45:49"
+    "loc": "45:44-45:45"
   },
   {
     "token": "RPAREN",
-    "loc": "45:49-45:50"
+    "loc": "45:45-45:46"
   },
   {
     "token": "RPAREN",
-    "loc": "45:50-45:51"
+    "loc": "45:46-45:47"
   },
   {
     "token": [
       "SEMI",
       false
     ],
-    "loc": "45:51-45:51"
+    "loc": "45:47-45:47"
   },
   {
     "token": "NEWLINE",
-    "loc": "45:51-45:52"
+    "loc": "45:47-45:48"
   },
   {
     "token": [
@@ -1786,32 +1770,24 @@
     "token": "COMMA",
     "loc": "63:35-63:36"
   },
-  {
-    "token": "FN",
-    "loc": "63:37-63:39"
-  },
-  {
-    "token": "LPAREN",
-    "loc": "63:40-63:41"
-  },
   {
     "token": [
       "LIDENT",
       "x"
     ],
-    "loc": "63:41-63:42"
+    "loc": "63:37-63:38"
   },
   {
-    "token": "RPAREN",
-    "loc": "63:42-63:43"
+    "token": "FAT_ARROW",
+    "loc": "63:39-63:41"
   },
   {
     "token": "LBRACE",
-    "loc": "63:44-63:45"
+    "loc": "63:42-63:43"
   },
   {
     "token": "NEWLINE",
-    "loc": "63:45-63:46"
+    "loc": "63:43-63:44"
   },
   {
     "token": "IF",
diff --git a/test/sync_test/__snapshot__/pipeline_test_error_tail.json b/test/sync_test/__snapshot__/pipeline_test_error_tail.json
new file mode 100644
index 00000000..281f59cd
--- /dev/null
+++ b/test/sync_test/__snapshot__/pipeline_test_error_tail.json
@@ -0,0 +1,1606 @@
+[
+  {
+    "kind": "Impl::TopFuncDef",
+    "loc": null,
+    "children": {
+      "fun_decl": {
+        "kind": "FunDecl",
+        "loc": null,
+        "children": {
+          "type_name": null,
+          "name": {
+            "kind": "Binder",
+            "loc": null,
+            "children": {
+              "name": "sum"
+            }
+          },
+          "has_error": null,
+          "is_async": null,
+          "decl_params": {
+            "kind": "FunDecl::ParameterList",
+            "loc": null,
+            "children": [
+              {
+                "kind": "Parameter::Positional",
+                "loc": null,
+                "children": {
+                  "binder": {
+                    "kind": "Binder",
+                    "loc": null,
+                    "children": {
+                      "name": "n"
+                    }
+                  },
+                  "ty": {
+                    "kind": "Type::Name",
+                    "loc": null,
+                    "children": {
+                      "constr_id": {
+                        "kind": "ConstrId",
+                        "loc": null,
+                        "children": {
+                          "id": {
+                            "kind": "LongIdent::Ident",
+                            "loc": null,
+                            "children": {
+                              "value": "Int"
+                            }
+                          }
+                        }
+                      },
+                      "tys": {
+                        "kind": "Type::Name::TypeList",
+                        "loc": null,
+                        "children": []
+                      }
+                    }
+                  }
+                }
+              }
+            ]
+          },
+          "quantifiers": {
+            "kind": "FunDecl::QuantifierList",
+            "loc": null,
+            "children": []
+          },
+          "return_type": {
+            "kind": "Type::Name",
+            "loc": null,
+            "children": {
+              "constr_id": {
+                "kind": "ConstrId",
+                "loc": null,
+                "children": {
+                  "id": {
+                    "kind": "LongIdent::Ident",
+                    "loc": null,
+                    "children": {
+                      "value": "Int"
+                    }
+                  }
+                }
+              },
+              "tys": {
+                "kind": "Type::Name::TypeList",
+                "loc": null,
+                "children": []
+              }
+            }
+          },
+          "error_type": {
+            "kind": "ErrorType::NoErrorType",
+            "loc": null,
+            "children": {}
+          },
+          "vis": {
+            "kind": "Visibility::Pub",
+            "loc": null,
+            "children": {
+              "attr": null
+            }
+          },
+          "attrs": {
+            "kind": "FunDecl::AttrList",
+            "loc": null,
+            "children": []
+          },
+          "doc": ""
+        }
+      },
+      "decl_body": {
+        "kind": "DeclBody::DeclBody",
+        "loc": null,
+        "children": {
+          "local_types": {
+            "kind": "DeclBody::DeclBody::LocalTypeList",
+            "loc": null,
+            "children": []
+          },
+          "expr": {
+            "kind": "Expr::LetFn",
+            "loc": null,
+            "children": {
+              "name": {
+                "kind": "Binder",
+                "loc": null,
+                "children": {
+                  "name": "taill_call_sum"
+                }
+              },
+              "func": {
+                "kind": "Func::Lambda",
+                "loc": null,
+                "children": {
+                  "parameters": {
+                    "kind": "Func::Lambda::ParameterList",
+                    "loc": null,
+                    "children": [
+                      {
+                        "kind": "Parameter::Positional",
+                        "loc": null,
+                        "children": {
+                          "binder": {
+                            "kind": "Binder",
+                            "loc": null,
+                            "children": {
+                              "name": "n"
+                            }
+                          },
+                          "ty": {
+                            "kind": "Type::Name",
+                            "loc": null,
+                            "children": {
+                              "constr_id": {
+                                "kind": "ConstrId",
+                                "loc": null,
+                                "children": {
+                                  "id": {
+                                    "kind": "LongIdent::Ident",
+                                    "loc": null,
+                                    "children": {
+                                      "value": "Int"
+                                    }
+                                  }
+                                }
+                              },
+                              "tys": {
+                                "kind": "Type::Name::TypeList",
+                                "loc": null,
+                                "children": []
+                              }
+                            }
+                          }
+                        }
+                      },
+                      {
+                        "kind": "Parameter::Positional",
+                        "loc": null,
+                        "children": {
+                          "binder": {
+                            "kind": "Binder",
+                            "loc": null,
+                            "children": {
+                              "name": "acc"
+                            }
+                          },
+                          "ty": {
+                            "kind": "Type::Name",
+                            "loc": null,
+                            "children": {
+                              "constr_id": {
+                                "kind": "ConstrId",
+                                "loc": null,
+                                "children": {
+                                  "id": {
+                                    "kind": "LongIdent::Ident",
+                                    "loc": null,
+                                    "children": {
+                                      "value": "Int"
+                                    }
+                                  }
+                                }
+                              },
+                              "tys": {
+                                "kind": "Type::Name::TypeList",
+                                "loc": null,
+                                "children": []
+                              }
+                            }
+                          }
+                        }
+                      }
+                    ]
+                  },
+                  "body": {
+                    "kind": "Expr::If",
+                    "loc": null,
+                    "children": {
+                      "cond": {
+                        "kind": "Expr::Infix",
+                        "loc": null,
+                        "children": {
+                          "op": {
+                            "kind": "Var",
+                            "loc": null,
+                            "children": {
+                              "name": {
+                                "kind": "LongIdent::Ident",
+                                "loc": null,
+                                "children": {
+                                  "value": "=="
+                                }
+                              }
+                            }
+                          },
+                          "lhs": {
+                            "kind": "Expr::Ident",
+                            "loc": null,
+                            "children": {
+                              "id": {
+                                "kind": "Var",
+                                "loc": null,
+                                "children": {
+                                  "name": {
+                                    "kind": "LongIdent::Ident",
+                                    "loc": null,
+                                    "children": {
+                                      "value": "n"
+                                    }
+                                  }
+                                }
+                              }
+                            }
+                          },
+                          "rhs": {
+                            "kind": "Expr::Constant",
+                            "loc": null,
+                            "children": {
+                              "constant": {
+                                "kind": "Constant::Int",
+                                "loc": null,
+                                "children": {
+                                  "value": "0"
+                                }
+                              }
+                            }
+                          }
+                        }
+                      },
+                      "ifso": {
+                        "kind": "Expr::Ident",
+                        "loc": null,
+                        "children": {
+                          "id": {
+                            "kind": "Var",
+                            "loc": null,
+                            "children": {
+                              "name": {
+                                "kind": "LongIdent::Ident",
+                                "loc": null,
+                                "children": {
+                                  "value": "acc"
+                                }
+                              }
+                            }
+                          }
+                        }
+                      },
+                      "ifnot": {
+                        "kind": "Expr::Apply",
+                        "loc": null,
+                        "children": {
+                          "func": {
+                            "kind": "Expr::Ident",
+                            "loc": null,
+                            "children": {
+                              "id": {
+                                "kind": "Var",
+                                "loc": null,
+                                "children": {
+                                  "name": {
+                                    "kind": "LongIdent::Ident",
+                                    "loc": null,
+                                    "children": {
+                                      "value": "taill_call_sum"
+                                    }
+                                  }
+                                }
+                              }
+                            }
+                          },
+                          "args": {
+                            "kind": "Expr::Apply::ArgumentList",
+                            "loc": null,
+                            "children": [
+                              {
+                                "kind": "Argument",
+                                "loc": null,
+                                "children": {
+                                  "value": {
+                                    "kind": "Expr::Infix",
+                                    "loc": null,
+                                    "children": {
+                                      "op": {
+                                        "kind": "Var",
+                                        "loc": null,
+                                        "children": {
+                                          "name": {
+                                            "kind": "LongIdent::Ident",
+                                            "loc": null,
+                                            "children": {
+                                              "value": "-"
+                                            }
+                                          }
+                                        }
+                                      },
+                                      "lhs": {
+                                        "kind": "Expr::Ident",
+                                        "loc": null,
+                                        "children": {
+                                          "id": {
+                                            "kind": "Var",
+                                            "loc": null,
+                                            "children": {
+                                              "name": {
+                                                "kind": "LongIdent::Ident",
+                                                "loc": null,
+                                                "children": {
+                                                  "value": "n"
+                                                }
+                                              }
+                                            }
+                                          }
+                                        }
+                                      },
+                                      "rhs": {
+                                        "kind": "Expr::Constant",
+                                        "loc": null,
+                                        "children": {
+                                          "constant": {
+                                            "kind": "Constant::Int",
+                                            "loc": null,
+                                            "children": {
+                                              "value": "1"
+                                            }
+                                          }
+                                        }
+                                      }
+                                    }
+                                  },
+                                  "kind": {
+                                    "kind": "ArgumentKind::Positional",
+                                    "loc": null,
+                                    "children": {}
+                                  }
+                                }
+                              },
+                              {
+                                "kind": "Argument",
+                                "loc": null,
+                                "children": {
+                                  "value": {
+                                    "kind": "Expr::Infix",
+                                    "loc": null,
+                                    "children": {
+                                      "op": {
+                                        "kind": "Var",
+                                        "loc": null,
+                                        "children": {
+                                          "name": {
+                                            "kind": "LongIdent::Ident",
+                                            "loc": null,
+                                            "children": {
+                                              "value": "+"
+                                            }
+                                          }
+                                        }
+                                      },
+                                      "lhs": {
+                                        "kind": "Expr::Ident",
+                                        "loc": null,
+                                        "children": {
+                                          "id": {
+                                            "kind": "Var",
+                                            "loc": null,
+                                            "children": {
+                                              "name": {
+                                                "kind": "LongIdent::Ident",
+                                                "loc": null,
+                                                "children": {
+                                                  "value": "acc"
+                                                }
+                                              }
+                                            }
+                                          }
+                                        }
+                                      },
+                                      "rhs": {
+                                        "kind": "Expr::Ident",
+                                        "loc": null,
+                                        "children": {
+                                          "id": {
+                                            "kind": "Var",
+                                            "loc": null,
+                                            "children": {
+                                              "name": {
+                                                "kind": "LongIdent::Ident",
+                                                "loc": null,
+                                                "children": {
+                                                  "value": "n"
+                                                }
+                                              }
+                                            }
+                                          }
+                                        }
+                                      }
+                                    }
+                                  },
+                                  "kind": {
+                                    "kind": "ArgumentKind::Positional",
+                                    "loc": null,
+                                    "children": {}
+                                  }
+                                }
+                              }
+                            ]
+                          },
+                          "attr": {
+                            "kind": "ApplyAttr::NoAttr",
+                            "loc": null,
+                            "children": {}
+                          }
+                        }
+                      }
+                    }
+                  },
+                  "return_type": {
+                    "kind": "Type::Name",
+                    "loc": null,
+                    "children": {
+                      "constr_id": {
+                        "kind": "ConstrId",
+                        "loc": null,
+                        "children": {
+                          "id": {
+                            "kind": "LongIdent::Ident",
+                            "loc": null,
+                            "children": {
+                              "value": "Int"
+                            }
+                          }
+                        }
+                      },
+                      "tys": {
+                        "kind": "Type::Name::TypeList",
+                        "loc": null,
+                        "children": []
+                      }
+                    }
+                  },
+                  "error_type": {
+                    "kind": "ErrorType::NoErrorType",
+                    "loc": null,
+                    "children": {}
+                  },
+                  "kind": {
+                    "kind": "FnKind::Lambda",
+                    "loc": null,
+                    "children": {}
+                  },
+                  "has_error": null,
+                  "is_async": null
+                }
+              },
+              "body": {
+                "kind": "Expr::Apply",
+                "loc": null,
+                "children": {
+                  "func": {
+                    "kind": "Expr::Ident",
+                    "loc": null,
+                    "children": {
+                      "id": {
+                        "kind": "Var",
+                        "loc": null,
+                        "children": {
+                          "name": {
+                            "kind": "LongIdent::Ident",
+                            "loc": null,
+                            "children": {
+                              "value": "taill_call_sum"
+                            }
+                          }
+                        }
+                      }
+                    }
+                  },
+                  "args": {
+                    "kind": "Expr::Apply::ArgumentList",
+                    "loc": null,
+                    "children": [
+                      {
+                        "kind": "Argument",
+                        "loc": null,
+                        "children": {
+                          "value": {
+                            "kind": "Expr::Ident",
+                            "loc": null,
+                            "children": {
+                              "id": {
+                                "kind": "Var",
+                                "loc": null,
+                                "children": {
+                                  "name": {
+                                    "kind": "LongIdent::Ident",
+                                    "loc": null,
+                                    "children": {
+                                      "value": "n"
+                                    }
+                                  }
+                                }
+                              }
+                            }
+                          },
+                          "kind": {
+                            "kind": "ArgumentKind::Positional",
+                            "loc": null,
+                            "children": {}
+                          }
+                        }
+                      },
+                      {
+                        "kind": "Argument",
+                        "loc": null,
+                        "children": {
+                          "value": {
+                            "kind": "Expr::Constant",
+                            "loc": null,
+                            "children": {
+                              "constant": {
+                                "kind": "Constant::Int",
+                                "loc": null,
+                                "children": {
+                                  "value": "0"
+                                }
+                              }
+                            }
+                          },
+                          "kind": {
+                            "kind": "ArgumentKind::Positional",
+                            "loc": null,
+                            "children": {}
+                          }
+                        }
+                      }
+                    ]
+                  },
+                  "attr": {
+                    "kind": "ApplyAttr::NoAttr",
+                    "loc": null,
+                    "children": {}
+                  }
+                }
+              }
+            }
+          }
+        }
+      }
+    }
+  },
+  {
+    "kind": "Impl::TopFuncDef",
+    "loc": null,
+    "children": {
+      "fun_decl": {
+        "kind": "FunDecl",
+        "loc": null,
+        "children": {
+          "type_name": null,
+          "name": {
+            "kind": "Binder",
+            "loc": null,
+            "children": {
+              "name": "sum2"
+            }
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+                                    "loc": null,
+                                    "children": {
+                                      "name": {
+                                        "kind": "LongIdent::Ident",
+                                        "loc": null,
+                                        "children": {
+                                          "value": "sum2"
+                                        }
+                                      }
+                                    }
+                                  }
+                                }
+                              },
+                              "args": {
+                                "kind": "Expr::Apply::ArgumentList",
+                                "loc": null,
+                                "children": [
+                                  {
+                                    "kind": "Argument",
+                                    "loc": null,
+                                    "children": {
+                                      "value": {
+                                        "kind": "Expr::Constant",
+                                        "loc": null,
+                                        "children": {
+                                          "constant": {
+                                            "kind": "Constant::Int",
+                                            "loc": null,
+                                            "children": {
+                                              "value": "10"
+                                            }
+                                          }
+                                        }
+                                      },
+                                      "kind": {
+                                        "kind": "ArgumentKind::Positional",
+                                        "loc": null,
+                                        "children": {}
+                                      }
+                                    }
+                                  }
+                                ]
+                              },
+                              "attr": {
+                                "kind": "ApplyAttr::NoAttr",
+                                "loc": null,
+                                "children": {}
+                              }
+                            }
+                          },
+                          "kind": {
+                            "kind": "ArgumentKind::Positional",
+                            "loc": null,
+                            "children": {}
+                          }
+                        }
+                      }
+                    ]
+                  },
+                  "attr": {
+                    "kind": "ApplyAttr::NoAttr",
+                    "loc": null,
+                    "children": {}
+                  }
+                }
+              }
+            }
+          }
+        }
+      }
+    }
+  }
+]
\ No newline at end of file
diff --git a/test/sync_test/__snapshot__/pipeline_test_error_tail.mbt b/test/sync_test/__snapshot__/pipeline_test_error_tail.mbt
index 4f3e5b3a..012b5372 100644
--- a/test/sync_test/__snapshot__/pipeline_test_error_tail.mbt
+++ b/test/sync_test/__snapshot__/pipeline_test_error_tail.mbt
@@ -24,7 +24,7 @@ pub fn sum2(n : Int) -> Int {
     taill_call_sum(n, 0)
   } catch {
     _ => abort("error")
-  } else {
+  } noraise {
     x => x
   }
 }
diff --git a/test/sync_test/__snapshot__/pipeline_test_error_tail.mbt.tokens.json b/test/sync_test/__snapshot__/pipeline_test_error_tail.mbt.tokens.json
index 397482e0..e658c29c 100644
--- a/test/sync_test/__snapshot__/pipeline_test_error_tail.mbt.tokens.json
+++ b/test/sync_test/__snapshot__/pipeline_test_error_tail.mbt.tokens.json
@@ -735,16 +735,16 @@
     "loc": "27:3-27:4"
   },
   {
-    "token": "ELSE",
-    "loc": "27:5-27:9"
+    "token": "NORAISE",
+    "loc": "27:5-27:12"
   },
   {
     "token": "LBRACE",
-    "loc": "27:10-27:11"
+    "loc": "27:13-27:14"
   },
   {
     "token": "NEWLINE",
-    "loc": "27:11-27:12"
+    "loc": "27:14-27:15"
   },
   {
     "token": [
diff --git a/test/sync_test/__snapshot__/pipeline_test_generator.json b/test/sync_test/__snapshot__/pipeline_test_generator.json
index 4f2f3638..1580c912 100644
--- a/test/sync_test/__snapshot__/pipeline_test_generator.json
+++ b/test/sync_test/__snapshot__/pipeline_test_generator.json
@@ -1004,80 +1004,149 @@
                                                         "children": []
                                                       },
                                                       "body": {
-                                                        "kind": "Expr::Sequence",
+                                                        "kind": "Expr::Group",
                                                         "loc": null,
                                                         "children": {
-                                                          "exprs": {
-                                                            "kind": "Expr::Sequence::ExprList",
+                                                          "expr": {
+                                                            "kind": "Expr::Sequence",
                                                             "loc": null,
-                                                            "children": [
-                                                              {
-                                                                "kind": "Expr::Apply",
+                                                            "children": {
+                                                              "exprs": {
+                                                                "kind": "Expr::Sequence::ExprList",
                                                                 "loc": null,
-                                                                "children": {
-                                                                  "func": {
-                                                                    "kind": "Expr::Ident",
+                                                                "children": [
+                                                                  {
+                                                                    "kind": "Expr::Apply",
                                                                     "loc": null,
                                                                     "children": {
-                                                                      "id": {
-                                                                        "kind": "Var",
+                                                                      "func": {
+                                                                        "kind": "Expr::Ident",
                                                                         "loc": null,
                                                                         "children": {
-                                                                          "name": {
-                                                                            "kind": "LongIdent::Ident",
+                                                                          "id": {
+                                                                            "kind": "Var",
                                                                             "loc": null,
                                                                             "children": {
-                                                                              "value": "f"
+                                                                              "name": {
+                                                                                "kind": "LongIdent::Ident",
+                                                                                "loc": null,
+                                                                                "children": {
+                                                                                  "value": "f"
+                                                                                }
+                                                                              }
                                                                             }
                                                                           }
                                                                         }
-                                                                      }
-                                                                    }
-                                                                  },
-                                                                  "args": {
-                                                                    "kind": "Expr::Apply::ArgumentList",
-                                                                    "loc": null,
-                                                                    "children": [
-                                                                      {
-                                                                        "kind": "Argument",
+                                                                      },
+                                                                      "args": {
+                                                                        "kind": "Expr::Apply::ArgumentList",
                                                                         "loc": null,
-                                                                        "children": {
-                                                                          "value": {
-                                                                            "kind": "Expr::Ident",
+                                                                        "children": [
+                                                                          {
+                                                                            "kind": "Argument",
                                                                             "loc": null,
                                                                             "children": {
-                                                                              "id": {
-                                                                                "kind": "Var",
+                                                                              "value": {
+                                                                                "kind": "Expr::Ident",
                                                                                 "loc": null,
                                                                                 "children": {
-                                                                                  "name": {
-                                                                                    "kind": "LongIdent::Ident",
+                                                                                  "id": {
+                                                                                    "kind": "Var",
                                                                                     "loc": null,
                                                                                     "children": {
-                                                                                      "value": "gen"
+                                                                                      "name": {
+                                                                                        "kind": "LongIdent::Ident",
+                                                                                        "loc": null,
+                                                                                        "children": {
+                                                                                          "value": "gen"
+                                                                                        }
+                                                                                      }
                                                                                     }
                                                                                   }
                                                                                 }
+                                                                              },
+                                                                              "kind": {
+                                                                                "kind": "ArgumentKind::Positional",
+                                                                                "loc": null,
+                                                                                "children": {}
                                                                               }
                                                                             }
-                                                                          },
-                                                                          "kind": {
-                                                                            "kind": "ArgumentKind::Positional",
-                                                                            "loc": null,
-                                                                            "children": {}
                                                                           }
-                                                                        }
+                                                                        ]
+                                                                      },
+                                                                      "attr": {
+                                                                        "kind": "ApplyAttr::NoAttr",
+                                                                        "loc": null,
+                                                                        "children": {}
                                                                       }
-                                                                    ]
+                                                                    }
                                                                   },
-                                                                  "attr": {
-                                                                    "kind": "ApplyAttr::NoAttr",
+                                                                  {
+                                                                    "kind": "Expr::Mutate",
                                                                     "loc": null,
-                                                                    "children": {}
+                                                                    "children": {
+                                                                      "record": {
+                                                                        "kind": "Expr::Ident",
+                                                                        "loc": null,
+                                                                        "children": {
+                                                                          "id": {
+                                                                            "kind": "Var",
+                                                                            "loc": null,
+                                                                            "children": {
+                                                                              "name": {
+                                                                                "kind": "LongIdent::Ident",
+                                                                                "loc": null,
+                                                                                "children": {
+                                                                                  "value": "gen"
+                                                                                }
+                                                                              }
+                                                                            }
+                                                                          }
+                                                                        }
+                                                                      },
+                                                                      "accessor": {
+                                                                        "kind": "Accessor::Label",
+                                                                        "loc": null,
+                                                                        "children": {
+                                                                          "value": {
+                                                                            "kind": "Label",
+                                                                            "loc": null,
+                                                                            "children": {
+                                                                              "name": "value"
+                                                                            }
+                                                                          }
+                                                                        }
+                                                                      },
+                                                                      "field": {
+                                                                        "kind": "Expr::Constr",
+                                                                        "loc": null,
+                                                                        "children": {
+                                                                          "constr": {
+                                                                            "kind": "Constructor",
+                                                                            "loc": null,
+                                                                            "children": {
+                                                                              "name": {
+                                                                                "kind": "ConstrName",
+                                                                                "loc": null,
+                                                                                "children": {
+                                                                                  "name": "None"
+                                                                                }
+                                                                              },
+                                                                              "extra_info": {
+                                                                                "kind": "ConstructorExtraInfo::NoExtraInfo",
+                                                                                "loc": null,
+                                                                                "children": {}
+                                                                              }
+                                                                            }
+                                                                          }
+                                                                        }
+                                                                      },
+                                                                      "augmented_by": null
+                                                                    }
                                                                   }
-                                                                }
+                                                                ]
                                                               },
-                                                              {
+                                                              "last_expr": {
                                                                 "kind": "Expr::Mutate",
                                                                 "loc": null,
                                                                 "children": {
@@ -1108,30 +1177,25 @@
                                                                         "kind": "Label",
                                                                         "loc": null,
                                                                         "children": {
-                                                                          "name": "value"
+                                                                          "name": "next"
                                                                         }
                                                                       }
                                                                     }
                                                                   },
                                                                   "field": {
-                                                                    "kind": "Expr::Constr",
+                                                                    "kind": "Expr::Ident",
                                                                     "loc": null,
                                                                     "children": {
-                                                                      "constr": {
-                                                                        "kind": "Constructor",
+                                                                      "id": {
+                                                                        "kind": "Var",
                                                                         "loc": null,
                                                                         "children": {
                                                                           "name": {
-                                                                            "kind": "ConstrName",
+                                                                            "kind": "LongIdent::Ident",
                                                                             "loc": null,
                                                                             "children": {
-                                                                              "name": "None"
+                                                                              "value": "panic"
                                                                             }
-                                                                          },
-                                                                          "extra_info": {
-                                                                            "kind": "ConstructorExtraInfo::NoExtraInfo",
-                                                                            "loc": null,
-                                                                            "children": {}
                                                                           }
                                                                         }
                                                                       }
@@ -1140,65 +1204,12 @@
                                                                   "augmented_by": null
                                                                 }
                                                               }
-                                                            ]
+                                                            }
                                                           },
-                                                          "last_expr": {
-                                                            "kind": "Expr::Mutate",
+                                                          "group": {
+                                                            "kind": "Group::Brace",
                                                             "loc": null,
-                                                            "children": {
-                                                              "record": {
-                                                                "kind": "Expr::Ident",
-                                                                "loc": null,
-                                                                "children": {
-                                                                  "id": {
-                                                                    "kind": "Var",
-                                                                    "loc": null,
-                                                                    "children": {
-                                                                      "name": {
-                                                                        "kind": "LongIdent::Ident",
-                                                                        "loc": null,
-                                                                        "children": {
-                                                                          "value": "gen"
-                                                                        }
-                                                                      }
-                                                                    }
-                                                                  }
-                                                                }
-                                                              },
-                                                              "accessor": {
-                                                                "kind": "Accessor::Label",
-                                                                "loc": null,
-                                                                "children": {
-                                                                  "value": {
-                                                                    "kind": "Label",
-                                                                    "loc": null,
-                                                                    "children": {
-                                                                      "name": "next"
-                                                                    }
-                                                                  }
-                                                                }
-                                                              },
-                                                              "field": {
-                                                                "kind": "Expr::Ident",
-                                                                "loc": null,
-                                                                "children": {
-                                                                  "id": {
-                                                                    "kind": "Var",
-                                                                    "loc": null,
-                                                                    "children": {
-                                                                      "name": {
-                                                                        "kind": "LongIdent::Ident",
-                                                                        "loc": null,
-                                                                        "children": {
-                                                                          "value": "panic"
-                                                                        }
-                                                                      }
-                                                                    }
-                                                                  }
-                                                                }
-                                                              },
-                                                              "augmented_by": null
-                                                            }
+                                                            "children": {}
                                                           }
                                                         }
                                                       },
@@ -1209,7 +1220,7 @@
                                                         "children": {}
                                                       },
                                                       "kind": {
-                                                        "kind": "FnKind::Lambda",
+                                                        "kind": "FnKind::Arrow",
                                                         "loc": null,
                                                         "children": {}
                                                       },
@@ -2589,63 +2600,50 @@
                                     ]
                                   },
                                   "body": {
-                                    "kind": "Expr::For",
+                                    "kind": "Expr::Group",
                                     "loc": null,
                                     "children": {
-                                      "binders": {
-                                        "kind": "Expr::For::BindingList",
+                                      "expr": {
+                                        "kind": "Expr::For",
                                         "loc": null,
-                                        "children": [
-                                          {
-                                            "kind": "For::Binding",
+                                        "children": {
+                                          "binders": {
+                                            "kind": "Expr::For::BindingList",
                                             "loc": null,
-                                            "children": {
-                                              "binder": {
-                                                "kind": "Binder",
-                                                "loc": null,
-                                                "children": {
-                                                  "name": "i"
-                                                }
-                                              },
-                                              "expr": {
-                                                "kind": "Expr::Constant",
+                                            "children": [
+                                              {
+                                                "kind": "For::Binding",
                                                 "loc": null,
                                                 "children": {
-                                                  "constant": {
-                                                    "kind": "Constant::Int",
+                                                  "binder": {
+                                                    "kind": "Binder",
+                                                    "loc": null,
+                                                    "children": {
+                                                      "name": "i"
+                                                    }
+                                                  },
+                                                  "expr": {
+                                                    "kind": "Expr::Constant",
                                                     "loc": null,
                                                     "children": {
-                                                      "value": "0"
+                                                      "constant": {
+                                                        "kind": "Constant::Int",
+                                                        "loc": null,
+                                                        "children": {
+                                                          "value": "0"
+                                                        }
+                                                      }
                                                     }
                                                   }
                                                 }
                                               }
-                                            }
-                                          }
-                                        ]
-                                      },
-                                      "condition": {
-                                        "kind": "Expr::Infix",
-                                        "loc": null,
-                                        "children": {
-                                          "op": {
-                                            "kind": "Var",
-                                            "loc": null,
-                                            "children": {
-                                              "name": {
-                                                "kind": "LongIdent::Ident",
-                                                "loc": null,
-                                                "children": {
-                                                  "value": "<"
-                                                }
-                                              }
-                                            }
+                                            ]
                                           },
-                                          "lhs": {
-                                            "kind": "Expr::Ident",
+                                          "condition": {
+                                            "kind": "Expr::Infix",
                                             "loc": null,
                                             "children": {
-                                              "id": {
+                                              "op": {
                                                 "kind": "Var",
                                                 "loc": null,
                                                 "children": {
@@ -2653,48 +2651,16 @@
                                                     "kind": "LongIdent::Ident",
                                                     "loc": null,
                                                     "children": {
-                                                      "value": "i"
+                                                      "value": "<"
                                                     }
                                                   }
                                                 }
-                                              }
-                                            }
-                                          },
-                                          "rhs": {
-                                            "kind": "Expr::Constant",
-                                            "loc": null,
-                                            "children": {
-                                              "constant": {
-                                                "kind": "Constant::Int",
-                                                "loc": null,
-                                                "children": {
-                                                  "value": "10"
-                                                }
-                                              }
-                                            }
-                                          }
-                                        }
-                                      },
-                                      "continue_block": {
-                                        "kind": "Expr::For::ContBindingList",
-                                        "loc": null,
-                                        "children": [
-                                          {
-                                            "kind": "For::ContBinding",
-                                            "loc": null,
-                                            "children": {
-                                              "binder": {
-                                                "kind": "Binder",
-                                                "loc": null,
-                                                "children": {
-                                                  "name": "i"
-                                                }
                                               },
-                                              "expr": {
-                                                "kind": "Expr::Infix",
+                                              "lhs": {
+                                                "kind": "Expr::Ident",
                                                 "loc": null,
                                                 "children": {
-                                                  "op": {
+                                                  "id": {
                                                     "kind": "Var",
                                                     "loc": null,
                                                     "children": {
@@ -2702,16 +2668,48 @@
                                                         "kind": "LongIdent::Ident",
                                                         "loc": null,
                                                         "children": {
-                                                          "value": "+"
+                                                          "value": "i"
                                                         }
                                                       }
                                                     }
+                                                  }
+                                                }
+                                              },
+                                              "rhs": {
+                                                "kind": "Expr::Constant",
+                                                "loc": null,
+                                                "children": {
+                                                  "constant": {
+                                                    "kind": "Constant::Int",
+                                                    "loc": null,
+                                                    "children": {
+                                                      "value": "10"
+                                                    }
+                                                  }
+                                                }
+                                              }
+                                            }
+                                          },
+                                          "continue_block": {
+                                            "kind": "Expr::For::ContBindingList",
+                                            "loc": null,
+                                            "children": [
+                                              {
+                                                "kind": "For::ContBinding",
+                                                "loc": null,
+                                                "children": {
+                                                  "binder": {
+                                                    "kind": "Binder",
+                                                    "loc": null,
+                                                    "children": {
+                                                      "name": "i"
+                                                    }
                                                   },
-                                                  "lhs": {
-                                                    "kind": "Expr::Ident",
+                                                  "expr": {
+                                                    "kind": "Expr::Infix",
                                                     "loc": null,
                                                     "children": {
-                                                      "id": {
+                                                      "op": {
                                                         "kind": "Var",
                                                         "loc": null,
                                                         "children": {
@@ -2719,109 +2717,133 @@
                                                             "kind": "LongIdent::Ident",
                                                             "loc": null,
                                                             "children": {
-                                                              "value": "i"
+                                                              "value": "+"
                                                             }
                                                           }
                                                         }
-                                                      }
-                                                    }
-                                                  },
-                                                  "rhs": {
-                                                    "kind": "Expr::Constant",
-                                                    "loc": null,
-                                                    "children": {
-                                                      "constant": {
-                                                        "kind": "Constant::Int",
+                                                      },
+                                                      "lhs": {
+                                                        "kind": "Expr::Ident",
                                                         "loc": null,
                                                         "children": {
-                                                          "value": "1"
+                                                          "id": {
+                                                            "kind": "Var",
+                                                            "loc": null,
+                                                            "children": {
+                                                              "name": {
+                                                                "kind": "LongIdent::Ident",
+                                                                "loc": null,
+                                                                "children": {
+                                                                  "value": "i"
+                                                                }
+                                                              }
+                                                            }
+                                                          }
+                                                        }
+                                                      },
+                                                      "rhs": {
+                                                        "kind": "Expr::Constant",
+                                                        "loc": null,
+                                                        "children": {
+                                                          "constant": {
+                                                            "kind": "Constant::Int",
+                                                            "loc": null,
+                                                            "children": {
+                                                              "value": "1"
+                                                            }
+                                                          }
                                                         }
                                                       }
                                                     }
                                                   }
                                                 }
                                               }
-                                            }
-                                          }
-                                        ]
-                                      },
-                                      "body": {
-                                        "kind": "Expr::DotApply",
-                                        "loc": null,
-                                        "children": {
-                                          "self": {
-                                            "kind": "Expr::Ident",
+                                            ]
+                                          },
+                                          "body": {
+                                            "kind": "Expr::DotApply",
                                             "loc": null,
                                             "children": {
-                                              "id": {
-                                                "kind": "Var",
+                                              "self": {
+                                                "kind": "Expr::Ident",
                                                 "loc": null,
                                                 "children": {
-                                                  "name": {
-                                                    "kind": "LongIdent::Ident",
+                                                  "id": {
+                                                    "kind": "Var",
                                                     "loc": null,
                                                     "children": {
-                                                      "value": "self"
+                                                      "name": {
+                                                        "kind": "LongIdent::Ident",
+                                                        "loc": null,
+                                                        "children": {
+                                                          "value": "self"
+                                                        }
+                                                      }
                                                     }
                                                   }
                                                 }
-                                              }
-                                            }
-                                          },
-                                          "method_name": {
-                                            "kind": "Label",
-                                            "loc": null,
-                                            "children": {
-                                              "name": "produce_value"
-                                            }
-                                          },
-                                          "args": {
-                                            "kind": "Expr::DotApply::ArgList",
-                                            "loc": null,
-                                            "children": [
-                                              {
-                                                "kind": "Argument",
+                                              },
+                                              "method_name": {
+                                                "kind": "Label",
                                                 "loc": null,
                                                 "children": {
-                                                  "value": {
-                                                    "kind": "Expr::Ident",
+                                                  "name": "produce_value"
+                                                }
+                                              },
+                                              "args": {
+                                                "kind": "Expr::DotApply::ArgList",
+                                                "loc": null,
+                                                "children": [
+                                                  {
+                                                    "kind": "Argument",
                                                     "loc": null,
                                                     "children": {
-                                                      "id": {
-                                                        "kind": "Var",
+                                                      "value": {
+                                                        "kind": "Expr::Ident",
                                                         "loc": null,
                                                         "children": {
-                                                          "name": {
-                                                            "kind": "LongIdent::Ident",
+                                                          "id": {
+                                                            "kind": "Var",
                                                             "loc": null,
                                                             "children": {
-                                                              "value": "i"
+                                                              "name": {
+                                                                "kind": "LongIdent::Ident",
+                                                                "loc": null,
+                                                                "children": {
+                                                                  "value": "i"
+                                                                }
+                                                              }
                                                             }
                                                           }
                                                         }
+                                                      },
+                                                      "kind": {
+                                                        "kind": "ArgumentKind::Positional",
+                                                        "loc": null,
+                                                        "children": {}
                                                       }
                                                     }
-                                                  },
-                                                  "kind": {
-                                                    "kind": "ArgumentKind::Positional",
-                                                    "loc": null,
-                                                    "children": {}
                                                   }
-                                                }
+                                                ]
+                                              },
+                                              "return_self": false,
+                                              "attr": {
+                                                "kind": "ApplyAttr::NoAttr",
+                                                "loc": null,
+                                                "children": {}
                                               }
-                                            ]
+                                            }
                                           },
-                                          "return_self": false,
-                                          "attr": {
-                                            "kind": "ApplyAttr::NoAttr",
-                                            "loc": null,
-                                            "children": {}
-                                          }
+                                          "for_else": null,
+                                          "where_clause": null,
+                                          "label": null
                                         }
                                       },
-                                      "for_else": null,
-                                      "where_clause": null,
-                                      "label": null
+                                      "group": {
+                                        "kind": "Group::Brace",
+                                        "loc": null,
+                                        "children": {}
+                                      }
                                     }
                                   },
                                   "return_type": null,
@@ -2831,7 +2853,7 @@
                                     "children": {}
                                   },
                                   "kind": {
-                                    "kind": "FnKind::Lambda",
+                                    "kind": "FnKind::Arrow",
                                     "loc": null,
                                     "children": {}
                                   },
diff --git a/test/sync_test/__snapshot__/pipeline_test_generator.mbt b/test/sync_test/__snapshot__/pipeline_test_generator.mbt
index a9600a61..a551cc57 100644
--- a/test/sync_test/__snapshot__/pipeline_test_generator.mbt
+++ b/test/sync_test/__snapshot__/pipeline_test_generator.mbt
@@ -11,7 +11,7 @@ struct Generator[Elem] {
 fn[Elem] Generator::spawn(f : async (Generator[Elem]) -> Unit noraise) -> Generator[Elem] {
   let gen = { value: None, next: panic }
   gen.next = fn () {
-    run_async(fn () {
+    run_async(() => {
       f(gen)
       gen.value = None
       // [code] will probably capture [coro] itself, forming a cycle,
@@ -42,7 +42,7 @@ fn[Elem] Generator::iter(self : Generator[Elem]) -> Iter[Elem] {
 }
 
 fn init {
-  let gen = Generator::spawn(fn (self) {
+  let gen = Generator::spawn(self => {
     for i = 0; i < 10; i = i + 1 {
       self.produce_value(i)
     }
diff --git a/test/sync_test/__snapshot__/pipeline_test_generator.mbt.tokens.json b/test/sync_test/__snapshot__/pipeline_test_generator.mbt.tokens.json
index 06b57e21..0497c453 100644
--- a/test/sync_test/__snapshot__/pipeline_test_generator.mbt.tokens.json
+++ b/test/sync_test/__snapshot__/pipeline_test_generator.mbt.tokens.json
@@ -639,17 +639,17 @@
     "token": "LPAREN",
     "loc": "14:14-14:15"
   },
-  {
-    "token": "FN",
-    "loc": "14:15-14:17"
-  },
   {
     "token": "LPAREN",
-    "loc": "14:18-14:19"
+    "loc": "14:15-14:16"
   },
   {
     "token": "RPAREN",
-    "loc": "14:19-14:20"
+    "loc": "14:16-14:17"
+  },
+  {
+    "token": "FAT_ARROW",
+    "loc": "14:18-14:20"
   },
   {
     "token": "LBRACE",
@@ -1614,32 +1614,24 @@
     "token": "LPAREN",
     "loc": "45:29-45:30"
   },
-  {
-    "token": "FN",
-    "loc": "45:30-45:32"
-  },
-  {
-    "token": "LPAREN",
-    "loc": "45:33-45:34"
-  },
   {
     "token": [
       "LIDENT",
       "self"
     ],
-    "loc": "45:34-45:38"
+    "loc": "45:30-45:34"
   },
   {
-    "token": "RPAREN",
-    "loc": "45:38-45:39"
+    "token": "FAT_ARROW",
+    "loc": "45:35-45:37"
   },
   {
     "token": "LBRACE",
-    "loc": "45:40-45:41"
+    "loc": "45:38-45:39"
   },
   {
     "token": "NEWLINE",
-    "loc": "45:41-45:42"
+    "loc": "45:39-45:40"
   },
   {
     "token": "FOR",
diff --git a/test/sync_test/__snapshot__/pipeline_test_generator2.json b/test/sync_test/__snapshot__/pipeline_test_generator2.json
index 5573c9c6..ec12ec79 100644
--- a/test/sync_test/__snapshot__/pipeline_test_generator2.json
+++ b/test/sync_test/__snapshot__/pipeline_test_generator2.json
@@ -1581,80 +1581,149 @@
                                                         "children": []
                                                       },
                                                       "body": {
-                                                        "kind": "Expr::Sequence",
+                                                        "kind": "Expr::Group",
                                                         "loc": null,
                                                         "children": {
-                                                          "exprs": {
-                                                            "kind": "Expr::Sequence::ExprList",
+                                                          "expr": {
+                                                            "kind": "Expr::Sequence",
                                                             "loc": null,
-                                                            "children": [
-                                                              {
-                                                                "kind": "Expr::Apply",
+                                                            "children": {
+                                                              "exprs": {
+                                                                "kind": "Expr::Sequence::ExprList",
                                                                 "loc": null,
-                                                                "children": {
-                                                                  "func": {
-                                                                    "kind": "Expr::Ident",
+                                                                "children": [
+                                                                  {
+                                                                    "kind": "Expr::Apply",
                                                                     "loc": null,
                                                                     "children": {
-                                                                      "id": {
-                                                                        "kind": "Var",
+                                                                      "func": {
+                                                                        "kind": "Expr::Ident",
                                                                         "loc": null,
                                                                         "children": {
-                                                                          "name": {
-                                                                            "kind": "LongIdent::Ident",
+                                                                          "id": {
+                                                                            "kind": "Var",
                                                                             "loc": null,
                                                                             "children": {
-                                                                              "value": "f"
+                                                                              "name": {
+                                                                                "kind": "LongIdent::Ident",
+                                                                                "loc": null,
+                                                                                "children": {
+                                                                                  "value": "f"
+                                                                                }
+                                                                              }
                                                                             }
                                                                           }
                                                                         }
-                                                                      }
-                                                                    }
-                                                                  },
-                                                                  "args": {
-                                                                    "kind": "Expr::Apply::ArgumentList",
-                                                                    "loc": null,
-                                                                    "children": [
-                                                                      {
-                                                                        "kind": "Argument",
+                                                                      },
+                                                                      "args": {
+                                                                        "kind": "Expr::Apply::ArgumentList",
                                                                         "loc": null,
-                                                                        "children": {
-                                                                          "value": {
-                                                                            "kind": "Expr::Ident",
+                                                                        "children": [
+                                                                          {
+                                                                            "kind": "Argument",
                                                                             "loc": null,
                                                                             "children": {
-                                                                              "id": {
-                                                                                "kind": "Var",
+                                                                              "value": {
+                                                                                "kind": "Expr::Ident",
                                                                                 "loc": null,
                                                                                 "children": {
-                                                                                  "name": {
-                                                                                    "kind": "LongIdent::Ident",
+                                                                                  "id": {
+                                                                                    "kind": "Var",
                                                                                     "loc": null,
                                                                                     "children": {
-                                                                                      "value": "gen"
+                                                                                      "name": {
+                                                                                        "kind": "LongIdent::Ident",
+                                                                                        "loc": null,
+                                                                                        "children": {
+                                                                                          "value": "gen"
+                                                                                        }
+                                                                                      }
                                                                                     }
                                                                                   }
                                                                                 }
+                                                                              },
+                                                                              "kind": {
+                                                                                "kind": "ArgumentKind::Positional",
+                                                                                "loc": null,
+                                                                                "children": {}
                                                                               }
                                                                             }
-                                                                          },
-                                                                          "kind": {
-                                                                            "kind": "ArgumentKind::Positional",
-                                                                            "loc": null,
-                                                                            "children": {}
                                                                           }
-                                                                        }
+                                                                        ]
+                                                                      },
+                                                                      "attr": {
+                                                                        "kind": "ApplyAttr::NoAttr",
+                                                                        "loc": null,
+                                                                        "children": {}
                                                                       }
-                                                                    ]
+                                                                    }
                                                                   },
-                                                                  "attr": {
-                                                                    "kind": "ApplyAttr::NoAttr",
+                                                                  {
+                                                                    "kind": "Expr::Mutate",
                                                                     "loc": null,
-                                                                    "children": {}
+                                                                    "children": {
+                                                                      "record": {
+                                                                        "kind": "Expr::Ident",
+                                                                        "loc": null,
+                                                                        "children": {
+                                                                          "id": {
+                                                                            "kind": "Var",
+                                                                            "loc": null,
+                                                                            "children": {
+                                                                              "name": {
+                                                                                "kind": "LongIdent::Ident",
+                                                                                "loc": null,
+                                                                                "children": {
+                                                                                  "value": "gen"
+                                                                                }
+                                                                              }
+                                                                            }
+                                                                          }
+                                                                        }
+                                                                      },
+                                                                      "accessor": {
+                                                                        "kind": "Accessor::Label",
+                                                                        "loc": null,
+                                                                        "children": {
+                                                                          "value": {
+                                                                            "kind": "Label",
+                                                                            "loc": null,
+                                                                            "children": {
+                                                                              "name": "value"
+                                                                            }
+                                                                          }
+                                                                        }
+                                                                      },
+                                                                      "field": {
+                                                                        "kind": "Expr::Constr",
+                                                                        "loc": null,
+                                                                        "children": {
+                                                                          "constr": {
+                                                                            "kind": "Constructor",
+                                                                            "loc": null,
+                                                                            "children": {
+                                                                              "name": {
+                                                                                "kind": "ConstrName",
+                                                                                "loc": null,
+                                                                                "children": {
+                                                                                  "name": "None"
+                                                                                }
+                                                                              },
+                                                                              "extra_info": {
+                                                                                "kind": "ConstructorExtraInfo::NoExtraInfo",
+                                                                                "loc": null,
+                                                                                "children": {}
+                                                                              }
+                                                                            }
+                                                                          }
+                                                                        }
+                                                                      },
+                                                                      "augmented_by": null
+                                                                    }
                                                                   }
-                                                                }
+                                                                ]
                                                               },
-                                                              {
+                                                              "last_expr": {
                                                                 "kind": "Expr::Mutate",
                                                                 "loc": null,
                                                                 "children": {
@@ -1685,30 +1754,25 @@
                                                                         "kind": "Label",
                                                                         "loc": null,
                                                                         "children": {
-                                                                          "name": "value"
+                                                                          "name": "next"
                                                                         }
                                                                       }
                                                                     }
                                                                   },
                                                                   "field": {
-                                                                    "kind": "Expr::Constr",
+                                                                    "kind": "Expr::Ident",
                                                                     "loc": null,
                                                                     "children": {
-                                                                      "constr": {
-                                                                        "kind": "Constructor",
+                                                                      "id": {
+                                                                        "kind": "Var",
                                                                         "loc": null,
                                                                         "children": {
                                                                           "name": {
-                                                                            "kind": "ConstrName",
+                                                                            "kind": "LongIdent::Ident",
                                                                             "loc": null,
                                                                             "children": {
-                                                                              "name": "None"
+                                                                              "value": "panic"
                                                                             }
-                                                                          },
-                                                                          "extra_info": {
-                                                                            "kind": "ConstructorExtraInfo::NoExtraInfo",
-                                                                            "loc": null,
-                                                                            "children": {}
                                                                           }
                                                                         }
                                                                       }
@@ -1717,65 +1781,12 @@
                                                                   "augmented_by": null
                                                                 }
                                                               }
-                                                            ]
+                                                            }
                                                           },
-                                                          "last_expr": {
-                                                            "kind": "Expr::Mutate",
+                                                          "group": {
+                                                            "kind": "Group::Brace",
                                                             "loc": null,
-                                                            "children": {
-                                                              "record": {
-                                                                "kind": "Expr::Ident",
-                                                                "loc": null,
-                                                                "children": {
-                                                                  "id": {
-                                                                    "kind": "Var",
-                                                                    "loc": null,
-                                                                    "children": {
-                                                                      "name": {
-                                                                        "kind": "LongIdent::Ident",
-                                                                        "loc": null,
-                                                                        "children": {
-                                                                          "value": "gen"
-                                                                        }
-                                                                      }
-                                                                    }
-                                                                  }
-                                                                }
-                                                              },
-                                                              "accessor": {
-                                                                "kind": "Accessor::Label",
-                                                                "loc": null,
-                                                                "children": {
-                                                                  "value": {
-                                                                    "kind": "Label",
-                                                                    "loc": null,
-                                                                    "children": {
-                                                                      "name": "next"
-                                                                    }
-                                                                  }
-                                                                }
-                                                              },
-                                                              "field": {
-                                                                "kind": "Expr::Ident",
-                                                                "loc": null,
-                                                                "children": {
-                                                                  "id": {
-                                                                    "kind": "Var",
-                                                                    "loc": null,
-                                                                    "children": {
-                                                                      "name": {
-                                                                        "kind": "LongIdent::Ident",
-                                                                        "loc": null,
-                                                                        "children": {
-                                                                          "value": "panic"
-                                                                        }
-                                                                      }
-                                                                    }
-                                                                  }
-                                                                }
-                                                              },
-                                                              "augmented_by": null
-                                                            }
+                                                            "children": {}
                                                           }
                                                         }
                                                       },
@@ -1786,7 +1797,7 @@
                                                         "children": {}
                                                       },
                                                       "kind": {
-                                                        "kind": "FnKind::Lambda",
+                                                        "kind": "FnKind::Arrow",
                                                         "loc": null,
                                                         "children": {}
                                                       },
@@ -4258,96 +4269,107 @@
                                     ]
                                   },
                                   "body": {
-                                    "kind": "Expr::Apply",
+                                    "kind": "Expr::Group",
                                     "loc": null,
                                     "children": {
-                                      "func": {
-                                        "kind": "Expr::Ident",
+                                      "expr": {
+                                        "kind": "Expr::Apply",
                                         "loc": null,
                                         "children": {
-                                          "id": {
-                                            "kind": "Var",
-                                            "loc": null,
-                                            "children": {
-                                              "name": {
-                                                "kind": "LongIdent::Ident",
-                                                "loc": null,
-                                                "children": {
-                                                  "value": "walk"
-                                                }
-                                              }
-                                            }
-                                          }
-                                        }
-                                      },
-                                      "args": {
-                                        "kind": "Expr::Apply::ArgumentList",
-                                        "loc": null,
-                                        "children": [
-                                          {
-                                            "kind": "Argument",
+                                          "func": {
+                                            "kind": "Expr::Ident",
                                             "loc": null,
                                             "children": {
-                                              "value": {
-                                                "kind": "Expr::Ident",
+                                              "id": {
+                                                "kind": "Var",
                                                 "loc": null,
                                                 "children": {
-                                                  "id": {
-                                                    "kind": "Var",
+                                                  "name": {
+                                                    "kind": "LongIdent::Ident",
                                                     "loc": null,
                                                     "children": {
-                                                      "name": {
-                                                        "kind": "LongIdent::Ident",
-                                                        "loc": null,
-                                                        "children": {
-                                                          "value": "self"
-                                                        }
-                                                      }
+                                                      "value": "walk"
                                                     }
                                                   }
                                                 }
-                                              },
-                                              "kind": {
-                                                "kind": "ArgumentKind::Positional",
-                                                "loc": null,
-                                                "children": {}
                                               }
                                             }
                                           },
-                                          {
-                                            "kind": "Argument",
+                                          "args": {
+                                            "kind": "Expr::Apply::ArgumentList",
                                             "loc": null,
-                                            "children": {
-                                              "value": {
-                                                "kind": "Expr::Ident",
+                                            "children": [
+                                              {
+                                                "kind": "Argument",
                                                 "loc": null,
                                                 "children": {
-                                                  "id": {
-                                                    "kind": "Var",
+                                                  "value": {
+                                                    "kind": "Expr::Ident",
                                                     "loc": null,
                                                     "children": {
-                                                      "name": {
-                                                        "kind": "LongIdent::Ident",
+                                                      "id": {
+                                                        "kind": "Var",
                                                         "loc": null,
                                                         "children": {
-                                                          "value": "tree"
+                                                          "name": {
+                                                            "kind": "LongIdent::Ident",
+                                                            "loc": null,
+                                                            "children": {
+                                                              "value": "self"
+                                                            }
+                                                          }
                                                         }
                                                       }
                                                     }
+                                                  },
+                                                  "kind": {
+                                                    "kind": "ArgumentKind::Positional",
+                                                    "loc": null,
+                                                    "children": {}
                                                   }
                                                 }
                                               },
-                                              "kind": {
-                                                "kind": "ArgumentKind::Positional",
+                                              {
+                                                "kind": "Argument",
                                                 "loc": null,
-                                                "children": {}
-                                              }
-                                            }
+                                                "children": {
+                                                  "value": {
+                                                    "kind": "Expr::Ident",
+                                                    "loc": null,
+                                                    "children": {
+                                                      "id": {
+                                                        "kind": "Var",
+                                                        "loc": null,
+                                                        "children": {
+                                                          "name": {
+                                                            "kind": "LongIdent::Ident",
+                                                            "loc": null,
+                                                            "children": {
+                                                              "value": "tree"
+                                                            }
+                                                          }
+                                                        }
+                                                      }
+                                                    }
+                                                  },
+                                                  "kind": {
+                                                    "kind": "ArgumentKind::Positional",
+                                                    "loc": null,
+                                                    "children": {}
+                                                  }
+                                                }
+                                              }
+                                            ]
+                                          },
+                                          "attr": {
+                                            "kind": "ApplyAttr::NoAttr",
+                                            "loc": null,
+                                            "children": {}
                                           }
-                                        ]
+                                        }
                                       },
-                                      "attr": {
-                                        "kind": "ApplyAttr::NoAttr",
+                                      "group": {
+                                        "kind": "Group::Brace",
                                         "loc": null,
                                         "children": {}
                                       }
@@ -4360,7 +4382,7 @@
                                     "children": {}
                                   },
                                   "kind": {
-                                    "kind": "FnKind::Lambda",
+                                    "kind": "FnKind::Arrow",
                                     "loc": null,
                                     "children": {}
                                   },
@@ -5160,481 +5182,503 @@
                                 ]
                               },
                               "body": {
-                                "kind": "Expr::Pipe",
+                                "kind": "Expr::Group",
                                 "loc": null,
                                 "children": {
-                                  "lhs": {
-                                    "kind": "Expr::DotApply",
+                                  "expr": {
+                                    "kind": "Expr::Pipe",
                                     "loc": null,
                                     "children": {
-                                      "self": {
-                                        "kind": "Expr::Ident",
+                                      "lhs": {
+                                        "kind": "Expr::DotApply",
                                         "loc": null,
                                         "children": {
-                                          "id": {
-                                            "kind": "Var",
+                                          "self": {
+                                            "kind": "Expr::Ident",
                                             "loc": null,
                                             "children": {
-                                              "name": {
-                                                "kind": "LongIdent::Ident",
+                                              "id": {
+                                                "kind": "Var",
                                                 "loc": null,
                                                 "children": {
-                                                  "value": "iter"
+                                                  "name": {
+                                                    "kind": "LongIdent::Ident",
+                                                    "loc": null,
+                                                    "children": {
+                                                      "value": "iter"
+                                                    }
+                                                  }
                                                 }
                                               }
                                             }
-                                          }
-                                        }
-                                      },
-                                      "method_name": {
-                                        "kind": "Label",
-                                        "loc": null,
-                                        "children": {
-                                          "name": "run"
-                                        }
-                                      },
-                                      "args": {
-                                        "kind": "Expr::DotApply::ArgList",
-                                        "loc": null,
-                                        "children": [
-                                          {
-                                            "kind": "Argument",
+                                          },
+                                          "method_name": {
+                                            "kind": "Label",
                                             "loc": null,
                                             "children": {
-                                              "value": {
-                                                "kind": "Expr::Function",
+                                              "name": "run"
+                                            }
+                                          },
+                                          "args": {
+                                            "kind": "Expr::DotApply::ArgList",
+                                            "loc": null,
+                                            "children": [
+                                              {
+                                                "kind": "Argument",
                                                 "loc": null,
                                                 "children": {
-                                                  "func": {
-                                                    "kind": "Func::Lambda",
+                                                  "value": {
+                                                    "kind": "Expr::Function",
                                                     "loc": null,
                                                     "children": {
-                                                      "parameters": {
-                                                        "kind": "Func::Lambda::ParameterList",
-                                                        "loc": null,
-                                                        "children": [
-                                                          {
-                                                            "kind": "Parameter::Positional",
-                                                            "loc": null,
-                                                            "children": {
-                                                              "binder": {
-                                                                "kind": "Binder",
-                                                                "loc": null,
-                                                                "children": {
-                                                                  "name": "v"
-                                                                }
-                                                              },
-                                                              "ty": null
-                                                            }
-                                                          }
-                                                        ]
-                                                      },
-                                                      "body": {
-                                                        "kind": "Expr::Apply",
+                                                      "func": {
+                                                        "kind": "Func::Lambda",
                                                         "loc": null,
                                                         "children": {
-                                                          "func": {
-                                                            "kind": "Expr::Ident",
+                                                          "parameters": {
+                                                            "kind": "Func::Lambda::ParameterList",
                                                             "loc": null,
-                                                            "children": {
-                                                              "id": {
-                                                                "kind": "Var",
+                                                            "children": [
+                                                              {
+                                                                "kind": "Parameter::Positional",
                                                                 "loc": null,
                                                                 "children": {
-                                                                  "name": {
-                                                                    "kind": "LongIdent::Ident",
+                                                                  "binder": {
+                                                                    "kind": "Binder",
                                                                     "loc": null,
                                                                     "children": {
-                                                                      "value": "callcc"
+                                                                      "name": "v"
                                                                     }
-                                                                  }
+                                                                  },
+                                                                  "ty": null
                                                                 }
                                                               }
-                                                            }
+                                                            ]
                                                           },
-                                                          "args": {
-                                                            "kind": "Expr::Apply::ArgumentList",
+                                                          "body": {
+                                                            "kind": "Expr::Group",
                                                             "loc": null,
-                                                            "children": [
-                                                              {
-                                                                "kind": "Argument",
+                                                            "children": {
+                                                              "expr": {
+                                                                "kind": "Expr::Apply",
                                                                 "loc": null,
                                                                 "children": {
-                                                                  "value": {
-                                                                    "kind": "Expr::Function",
+                                                                  "func": {
+                                                                    "kind": "Expr::Ident",
                                                                     "loc": null,
                                                                     "children": {
-                                                                      "func": {
-                                                                        "kind": "Func::Lambda",
+                                                                      "id": {
+                                                                        "kind": "Var",
                                                                         "loc": null,
                                                                         "children": {
-                                                                          "parameters": {
-                                                                            "kind": "Func::Lambda::ParameterList",
+                                                                          "name": {
+                                                                            "kind": "LongIdent::Ident",
                                                                             "loc": null,
-                                                                            "children": [
-                                                                              {
-                                                                                "kind": "Parameter::Positional",
-                                                                                "loc": null,
-                                                                                "children": {
-                                                                                  "binder": {
-                                                                                    "kind": "Binder",
-                                                                                    "loc": null,
-                                                                                    "children": {
-                                                                                      "name": "k"
-                                                                                    }
-                                                                                  },
-                                                                                  "ty": null
-                                                                                }
-                                                                              }
-                                                                            ]
-                                                                          },
-                                                                          "body": {
-                                                                            "kind": "Expr::Sequence",
+                                                                            "children": {
+                                                                              "value": "callcc"
+                                                                            }
+                                                                          }
+                                                                        }
+                                                                      }
+                                                                    }
+                                                                  },
+                                                                  "args": {
+                                                                    "kind": "Expr::Apply::ArgumentList",
+                                                                    "loc": null,
+                                                                    "children": [
+                                                                      {
+                                                                        "kind": "Argument",
+                                                                        "loc": null,
+                                                                        "children": {
+                                                                          "value": {
+                                                                            "kind": "Expr::Function",
                                                                             "loc": null,
                                                                             "children": {
-                                                                              "exprs": {
-                                                                                "kind": "Expr::Sequence::ExprList",
+                                                                              "func": {
+                                                                                "kind": "Func::Lambda",
                                                                                 "loc": null,
-                                                                                "children": [
-                                                                                  {
-                                                                                    "kind": "Expr::Mutate",
+                                                                                "children": {
+                                                                                  "parameters": {
+                                                                                    "kind": "Func::Lambda::ParameterList",
                                                                                     "loc": null,
-                                                                                    "children": {
-                                                                                      "record": {
-                                                                                        "kind": "Expr::Ident",
-                                                                                        "loc": null,
-                                                                                        "children": {
-                                                                                          "id": {
-                                                                                            "kind": "Var",
-                                                                                            "loc": null,
-                                                                                            "children": {
-                                                                                              "name": {
-                                                                                                "kind": "LongIdent::Ident",
-                                                                                                "loc": null,
-                                                                                                "children": {
-                                                                                                  "value": "self"
-                                                                                                }
-                                                                                              }
-                                                                                            }
-                                                                                          }
-                                                                                        }
-                                                                                      },
-                                                                                      "accessor": {
-                                                                                        "kind": "Accessor::Label",
+                                                                                    "children": [
+                                                                                      {
+                                                                                        "kind": "Parameter::Positional",
                                                                                         "loc": null,
                                                                                         "children": {
-                                                                                          "value": {
-                                                                                            "kind": "Label",
+                                                                                          "binder": {
+                                                                                            "kind": "Binder",
                                                                                             "loc": null,
                                                                                             "children": {
-                                                                                              "name": "value"
+                                                                                              "name": "k"
                                                                                             }
-                                                                                          }
+                                                                                          },
+                                                                                          "ty": null
                                                                                         }
-                                                                                      },
-                                                                                      "field": {
-                                                                                        "kind": "Expr::Apply",
+                                                                                      }
+                                                                                    ]
+                                                                                  },
+                                                                                  "body": {
+                                                                                    "kind": "Expr::Sequence",
+                                                                                    "loc": null,
+                                                                                    "children": {
+                                                                                      "exprs": {
+                                                                                        "kind": "Expr::Sequence::ExprList",
                                                                                         "loc": null,
-                                                                                        "children": {
-                                                                                          "func": {
-                                                                                            "kind": "Expr::Constr",
+                                                                                        "children": [
+                                                                                          {
+                                                                                            "kind": "Expr::Mutate",
                                                                                             "loc": null,
                                                                                             "children": {
-                                                                                              "constr": {
-                                                                                                "kind": "Constructor",
+                                                                                              "record": {
+                                                                                                "kind": "Expr::Ident",
                                                                                                 "loc": null,
                                                                                                 "children": {
-                                                                                                  "name": {
-                                                                                                    "kind": "ConstrName",
+                                                                                                  "id": {
+                                                                                                    "kind": "Var",
                                                                                                     "loc": null,
                                                                                                     "children": {
-                                                                                                      "name": "Some"
+                                                                                                      "name": {
+                                                                                                        "kind": "LongIdent::Ident",
+                                                                                                        "loc": null,
+                                                                                                        "children": {
+                                                                                                          "value": "self"
+                                                                                                        }
+                                                                                                      }
                                                                                                     }
-                                                                                                  },
-                                                                                                  "extra_info": {
-                                                                                                    "kind": "ConstructorExtraInfo::NoExtraInfo",
-                                                                                                    "loc": null,
-                                                                                                    "children": {}
                                                                                                   }
                                                                                                 }
-                                                                                              }
-                                                                                            }
-                                                                                          },
-                                                                                          "args": {
-                                                                                            "kind": "Expr::Apply::ArgumentList",
-                                                                                            "loc": null,
-                                                                                            "children": [
-                                                                                              {
-                                                                                                "kind": "Argument",
+                                                                                              },
+                                                                                              "accessor": {
+                                                                                                "kind": "Accessor::Label",
                                                                                                 "loc": null,
                                                                                                 "children": {
                                                                                                   "value": {
-                                                                                                    "kind": "Expr::Ident",
+                                                                                                    "kind": "Label",
                                                                                                     "loc": null,
                                                                                                     "children": {
-                                                                                                      "id": {
-                                                                                                        "kind": "Var",
+                                                                                                      "name": "value"
+                                                                                                    }
+                                                                                                  }
+                                                                                                }
+                                                                                              },
+                                                                                              "field": {
+                                                                                                "kind": "Expr::Apply",
+                                                                                                "loc": null,
+                                                                                                "children": {
+                                                                                                  "func": {
+                                                                                                    "kind": "Expr::Constr",
+                                                                                                    "loc": null,
+                                                                                                    "children": {
+                                                                                                      "constr": {
+                                                                                                        "kind": "Constructor",
                                                                                                         "loc": null,
                                                                                                         "children": {
                                                                                                           "name": {
-                                                                                                            "kind": "LongIdent::Ident",
+                                                                                                            "kind": "ConstrName",
                                                                                                             "loc": null,
                                                                                                             "children": {
-                                                                                                              "value": "v"
+                                                                                                              "name": "Some"
                                                                                                             }
+                                                                                                          },
+                                                                                                          "extra_info": {
+                                                                                                            "kind": "ConstructorExtraInfo::NoExtraInfo",
+                                                                                                            "loc": null,
+                                                                                                            "children": {}
                                                                                                           }
                                                                                                         }
                                                                                                       }
                                                                                                     }
                                                                                                   },
-                                                                                                  "kind": {
-                                                                                                    "kind": "ArgumentKind::Positional",
+                                                                                                  "args": {
+                                                                                                    "kind": "Expr::Apply::ArgumentList",
+                                                                                                    "loc": null,
+                                                                                                    "children": [
+                                                                                                      {
+                                                                                                        "kind": "Argument",
+                                                                                                        "loc": null,
+                                                                                                        "children": {
+                                                                                                          "value": {
+                                                                                                            "kind": "Expr::Ident",
+                                                                                                            "loc": null,
+                                                                                                            "children": {
+                                                                                                              "id": {
+                                                                                                                "kind": "Var",
+                                                                                                                "loc": null,
+                                                                                                                "children": {
+                                                                                                                  "name": {
+                                                                                                                    "kind": "LongIdent::Ident",
+                                                                                                                    "loc": null,
+                                                                                                                    "children": {
+                                                                                                                      "value": "v"
+                                                                                                                    }
+                                                                                                                  }
+                                                                                                                }
+                                                                                                              }
+                                                                                                            }
+                                                                                                          },
+                                                                                                          "kind": {
+                                                                                                            "kind": "ArgumentKind::Positional",
+                                                                                                            "loc": null,
+                                                                                                            "children": {}
+                                                                                                          }
+                                                                                                        }
+                                                                                                      }
+                                                                                                    ]
+                                                                                                  },
+                                                                                                  "attr": {
+                                                                                                    "kind": "ApplyAttr::NoAttr",
                                                                                                     "loc": null,
                                                                                                     "children": {}
                                                                                                   }
                                                                                                 }
-                                                                                              }
-                                                                                            ]
-                                                                                          },
-                                                                                          "attr": {
-                                                                                            "kind": "ApplyAttr::NoAttr",
-                                                                                            "loc": null,
-                                                                                            "children": {}
+                                                                                              },
+                                                                                              "augmented_by": null
+                                                                                            }
                                                                                           }
-                                                                                        }
+                                                                                        ]
                                                                                       },
-                                                                                      "augmented_by": null
-                                                                                    }
-                                                                                  }
-                                                                                ]
-                                                                              },
-                                                                              "last_expr": {
-                                                                                "kind": "Expr::Mutate",
-                                                                                "loc": null,
-                                                                                "children": {
-                                                                                  "record": {
-                                                                                    "kind": "Expr::Ident",
-                                                                                    "loc": null,
-                                                                                    "children": {
-                                                                                      "id": {
-                                                                                        "kind": "Var",
+                                                                                      "last_expr": {
+                                                                                        "kind": "Expr::Mutate",
                                                                                         "loc": null,
                                                                                         "children": {
-                                                                                          "name": {
-                                                                                            "kind": "LongIdent::Ident",
+                                                                                          "record": {
+                                                                                            "kind": "Expr::Ident",
                                                                                             "loc": null,
                                                                                             "children": {
-                                                                                              "value": "self"
+                                                                                              "id": {
+                                                                                                "kind": "Var",
+                                                                                                "loc": null,
+                                                                                                "children": {
+                                                                                                  "name": {
+                                                                                                    "kind": "LongIdent::Ident",
+                                                                                                    "loc": null,
+                                                                                                    "children": {
+                                                                                                      "value": "self"
+                                                                                                    }
+                                                                                                  }
+                                                                                                }
+                                                                                              }
                                                                                             }
-                                                                                          }
-                                                                                        }
-                                                                                      }
-                                                                                    }
-                                                                                  },
-                                                                                  "accessor": {
-                                                                                    "kind": "Accessor::Label",
-                                                                                    "loc": null,
-                                                                                    "children": {
-                                                                                      "value": {
-                                                                                        "kind": "Label",
-                                                                                        "loc": null,
-                                                                                        "children": {
-                                                                                          "name": "next"
-                                                                                        }
-                                                                                      }
-                                                                                    }
-                                                                                  },
-                                                                                  "field": {
-                                                                                    "kind": "Expr::Function",
-                                                                                    "loc": null,
-                                                                                    "children": {
-                                                                                      "func": {
-                                                                                        "kind": "Func::Lambda",
-                                                                                        "loc": null,
-                                                                                        "children": {
-                                                                                          "parameters": {
-                                                                                            "kind": "Func::Lambda::ParameterList",
+                                                                                          },
+                                                                                          "accessor": {
+                                                                                            "kind": "Accessor::Label",
                                                                                             "loc": null,
-                                                                                            "children": []
+                                                                                            "children": {
+                                                                                              "value": {
+                                                                                                "kind": "Label",
+                                                                                                "loc": null,
+                                                                                                "children": {
+                                                                                                  "name": "next"
+                                                                                                }
+                                                                                              }
+                                                                                            }
                                                                                           },
-                                                                                          "body": {
-                                                                                            "kind": "Expr::Apply",
+                                                                                          "field": {
+                                                                                            "kind": "Expr::Function",
                                                                                             "loc": null,
                                                                                             "children": {
                                                                                               "func": {
-                                                                                                "kind": "Expr::Ident",
+                                                                                                "kind": "Func::Lambda",
                                                                                                 "loc": null,
                                                                                                 "children": {
-                                                                                                  "id": {
-                                                                                                    "kind": "Var",
+                                                                                                  "parameters": {
+                                                                                                    "kind": "Func::Lambda::ParameterList",
                                                                                                     "loc": null,
-                                                                                                    "children": {
-                                                                                                      "name": {
-                                                                                                        "kind": "LongIdent::Ident",
-                                                                                                        "loc": null,
-                                                                                                        "children": {
-                                                                                                          "value": "k"
-                                                                                                        }
-                                                                                                      }
-                                                                                                    }
-                                                                                                  }
-                                                                                                }
-                                                                                              },
-                                                                                              "args": {
-                                                                                                "kind": "Expr::Apply::ArgumentList",
-                                                                                                "loc": null,
-                                                                                                "children": [
-                                                                                                  {
-                                                                                                    "kind": "Argument",
+                                                                                                    "children": []
+                                                                                                  },
+                                                                                                  "body": {
+                                                                                                    "kind": "Expr::Apply",
                                                                                                     "loc": null,
                                                                                                     "children": {
-                                                                                                      "value": {
-                                                                                                        "kind": "Expr::Constr",
+                                                                                                      "func": {
+                                                                                                        "kind": "Expr::Ident",
                                                                                                         "loc": null,
                                                                                                         "children": {
-                                                                                                          "constr": {
-                                                                                                            "kind": "Constructor",
+                                                                                                          "id": {
+                                                                                                            "kind": "Var",
                                                                                                             "loc": null,
                                                                                                             "children": {
                                                                                                               "name": {
-                                                                                                                "kind": "ConstrName",
+                                                                                                                "kind": "LongIdent::Ident",
+                                                                                                                "loc": null,
+                                                                                                                "children": {
+                                                                                                                  "value": "k"
+                                                                                                                }
+                                                                                                              }
+                                                                                                            }
+                                                                                                          }
+                                                                                                        }
+                                                                                                      },
+                                                                                                      "args": {
+                                                                                                        "kind": "Expr::Apply::ArgumentList",
+                                                                                                        "loc": null,
+                                                                                                        "children": [
+                                                                                                          {
+                                                                                                            "kind": "Argument",
+                                                                                                            "loc": null,
+                                                                                                            "children": {
+                                                                                                              "value": {
+                                                                                                                "kind": "Expr::Constr",
                                                                                                                 "loc": null,
                                                                                                                 "children": {
-                                                                                                                  "name": "IterContinue"
+                                                                                                                  "constr": {
+                                                                                                                    "kind": "Constructor",
+                                                                                                                    "loc": null,
+                                                                                                                    "children": {
+                                                                                                                      "name": {
+                                                                                                                        "kind": "ConstrName",
+                                                                                                                        "loc": null,
+                                                                                                                        "children": {
+                                                                                                                          "name": "IterContinue"
+                                                                                                                        }
+                                                                                                                      },
+                                                                                                                      "extra_info": {
+                                                                                                                        "kind": "ConstructorExtraInfo::NoExtraInfo",
+                                                                                                                        "loc": null,
+                                                                                                                        "children": {}
+                                                                                                                      }
+                                                                                                                    }
+                                                                                                                  }
                                                                                                                 }
                                                                                                               },
-                                                                                                              "extra_info": {
-                                                                                                                "kind": "ConstructorExtraInfo::NoExtraInfo",
+                                                                                                              "kind": {
+                                                                                                                "kind": "ArgumentKind::Positional",
                                                                                                                 "loc": null,
                                                                                                                 "children": {}
                                                                                                               }
                                                                                                             }
                                                                                                           }
-                                                                                                        }
+                                                                                                        ]
                                                                                                       },
-                                                                                                      "kind": {
-                                                                                                        "kind": "ArgumentKind::Positional",
+                                                                                                      "attr": {
+                                                                                                        "kind": "ApplyAttr::NoAttr",
                                                                                                         "loc": null,
                                                                                                         "children": {}
                                                                                                       }
                                                                                                     }
-                                                                                                  }
-                                                                                                ]
-                                                                                              },
-                                                                                              "attr": {
-                                                                                                "kind": "ApplyAttr::NoAttr",
-                                                                                                "loc": null,
-                                                                                                "children": {}
+                                                                                                  },
+                                                                                                  "return_type": null,
+                                                                                                  "error_type": {
+                                                                                                    "kind": "ErrorType::NoErrorType",
+                                                                                                    "loc": null,
+                                                                                                    "children": {}
+                                                                                                  },
+                                                                                                  "kind": {
+                                                                                                    "kind": "FnKind::Lambda",
+                                                                                                    "loc": null,
+                                                                                                    "children": {}
+                                                                                                  },
+                                                                                                  "has_error": null,
+                                                                                                  "is_async": null
+                                                                                                }
                                                                                               }
                                                                                             }
                                                                                           },
-                                                                                          "return_type": null,
-                                                                                          "error_type": {
-                                                                                            "kind": "ErrorType::NoErrorType",
-                                                                                            "loc": null,
-                                                                                            "children": {}
-                                                                                          },
-                                                                                          "kind": {
-                                                                                            "kind": "FnKind::Lambda",
-                                                                                            "loc": null,
-                                                                                            "children": {}
-                                                                                          },
-                                                                                          "has_error": null,
-                                                                                          "is_async": null
+                                                                                          "augmented_by": null
                                                                                         }
                                                                                       }
                                                                                     }
                                                                                   },
-                                                                                  "augmented_by": null
+                                                                                  "return_type": null,
+                                                                                  "error_type": {
+                                                                                    "kind": "ErrorType::NoErrorType",
+                                                                                    "loc": null,
+                                                                                    "children": {}
+                                                                                  },
+                                                                                  "kind": {
+                                                                                    "kind": "FnKind::Lambda",
+                                                                                    "loc": null,
+                                                                                    "children": {}
+                                                                                  },
+                                                                                  "has_error": null,
+                                                                                  "is_async": null
                                                                                 }
                                                                               }
                                                                             }
                                                                           },
-                                                                          "return_type": null,
-                                                                          "error_type": {
-                                                                            "kind": "ErrorType::NoErrorType",
-                                                                            "loc": null,
-                                                                            "children": {}
-                                                                          },
                                                                           "kind": {
-                                                                            "kind": "FnKind::Lambda",
+                                                                            "kind": "ArgumentKind::Positional",
                                                                             "loc": null,
                                                                             "children": {}
-                                                                          },
-                                                                          "has_error": null,
-                                                                          "is_async": null
+                                                                          }
                                                                         }
                                                                       }
-                                                                    }
+                                                                    ]
                                                                   },
-                                                                  "kind": {
-                                                                    "kind": "ArgumentKind::Positional",
+                                                                  "attr": {
+                                                                    "kind": "ApplyAttr::NoAttr",
                                                                     "loc": null,
                                                                     "children": {}
                                                                   }
                                                                 }
+                                                              },
+                                                              "group": {
+                                                                "kind": "Group::Brace",
+                                                                "loc": null,
+                                                                "children": {}
                                                               }
-                                                            ]
+                                                            }
                                                           },
-                                                          "attr": {
-                                                            "kind": "ApplyAttr::NoAttr",
+                                                          "return_type": null,
+                                                          "error_type": {
+                                                            "kind": "ErrorType::NoErrorType",
                                                             "loc": null,
                                                             "children": {}
-                                                          }
+                                                          },
+                                                          "kind": {
+                                                            "kind": "FnKind::Arrow",
+                                                            "loc": null,
+                                                            "children": {}
+                                                          },
+                                                          "has_error": null,
+                                                          "is_async": null
                                                         }
-                                                      },
-                                                      "return_type": null,
-                                                      "error_type": {
-                                                        "kind": "ErrorType::NoErrorType",
-                                                        "loc": null,
-                                                        "children": {}
-                                                      },
-                                                      "kind": {
-                                                        "kind": "FnKind::Lambda",
-                                                        "loc": null,
-                                                        "children": {}
-                                                      },
-                                                      "has_error": null,
-                                                      "is_async": null
+                                                      }
                                                     }
+                                                  },
+                                                  "kind": {
+                                                    "kind": "ArgumentKind::Positional",
+                                                    "loc": null,
+                                                    "children": {}
                                                   }
                                                 }
-                                              },
-                                              "kind": {
-                                                "kind": "ArgumentKind::Positional",
-                                                "loc": null,
-                                                "children": {}
                                               }
-                                            }
+                                            ]
+                                          },
+                                          "return_self": false,
+                                          "attr": {
+                                            "kind": "ApplyAttr::NoAttr",
+                                            "loc": null,
+                                            "children": {}
                                           }
-                                        ]
+                                        }
                                       },
-                                      "return_self": false,
-                                      "attr": {
-                                        "kind": "ApplyAttr::NoAttr",
-                                        "loc": null,
-                                        "children": {}
-                                      }
-                                    }
-                                  },
-                                  "rhs": {
-                                    "kind": "Expr::Ident",
-                                    "loc": null,
-                                    "children": {
-                                      "id": {
-                                        "kind": "Var",
+                                      "rhs": {
+                                        "kind": "Expr::Ident",
                                         "loc": null,
                                         "children": {
-                                          "name": {
-                                            "kind": "LongIdent::Ident",
+                                          "id": {
+                                            "kind": "Var",
                                             "loc": null,
                                             "children": {
-                                              "value": "ignore"
+                                              "name": {
+                                                "kind": "LongIdent::Ident",
+                                                "loc": null,
+                                                "children": {
+                                                  "value": "ignore"
+                                                }
+                                              }
                                             }
                                           }
                                         }
                                       }
                                     }
+                                  },
+                                  "group": {
+                                    "kind": "Group::Brace",
+                                    "loc": null,
+                                    "children": {}
                                   }
                                 }
                               },
@@ -5645,7 +5689,7 @@
                                 "children": {}
                               },
                               "kind": {
-                                "kind": "FnKind::Lambda",
+                                "kind": "FnKind::Arrow",
                                 "loc": null,
                                 "children": {}
                               },
diff --git a/test/sync_test/__snapshot__/pipeline_test_generator2.mbt b/test/sync_test/__snapshot__/pipeline_test_generator2.mbt
index d2b795d8..d0bbf824 100644
--- a/test/sync_test/__snapshot__/pipeline_test_generator2.mbt
+++ b/test/sync_test/__snapshot__/pipeline_test_generator2.mbt
@@ -26,7 +26,7 @@ fn[Elem : Show] print_generator(gen : Generator[Elem]) -> Unit {
 fn[Elem] Generator::spawn(f : async (Generator[Elem]) -> Unit noraise) -> Generator[Elem] {
   let gen = { value: None, next: panic }
   gen.next = fn () {
-    run_async(fn () {
+    run_async(() => {
       f(gen)
       gen.value = None
       // [code] will probably capture [coro] itself, forming a cycle,
@@ -79,7 +79,7 @@ fn tree_generator(tree : Tree) -> Generator[Int] {
       }
     }
   }
-  Generator::spawn(fn (self) {
+  Generator::spawn(self => {
     walk(self, tree)
   })
 }
@@ -91,8 +91,8 @@ async fn[T] AIter::run(self : AIter[T], f : async (T) -> IterResult noraise) ->
 }
 
 fn[Elem] from_iter(iter: AIter[Elem]) -> Generator[Elem] {
-  Generator::spawn(fn (self) {
-    iter.run(fn (v) {
+  Generator::spawn(self => {
+    iter.run(v => {
       callcc(fn (k) {
         self.value = Some(v)
         self.next = fn () { k(IterContinue) }
diff --git a/test/sync_test/__snapshot__/pipeline_test_generator2.mbt.tokens.json b/test/sync_test/__snapshot__/pipeline_test_generator2.mbt.tokens.json
index 9b2d97c4..714f70c9 100644
--- a/test/sync_test/__snapshot__/pipeline_test_generator2.mbt.tokens.json
+++ b/test/sync_test/__snapshot__/pipeline_test_generator2.mbt.tokens.json
@@ -1031,17 +1031,17 @@
     "token": "LPAREN",
     "loc": "29:14-29:15"
   },
-  {
-    "token": "FN",
-    "loc": "29:15-29:17"
-  },
   {
     "token": "LPAREN",
-    "loc": "29:18-29:19"
+    "loc": "29:15-29:16"
   },
   {
     "token": "RPAREN",
-    "loc": "29:19-29:20"
+    "loc": "29:16-29:17"
+  },
+  {
+    "token": "FAT_ARROW",
+    "loc": "29:18-29:20"
   },
   {
     "token": "LBRACE",
@@ -2598,32 +2598,24 @@
     "token": "LPAREN",
     "loc": "82:19-82:20"
   },
-  {
-    "token": "FN",
-    "loc": "82:20-82:22"
-  },
-  {
-    "token": "LPAREN",
-    "loc": "82:23-82:24"
-  },
   {
     "token": [
       "LIDENT",
       "self"
     ],
-    "loc": "82:24-82:28"
+    "loc": "82:20-82:24"
   },
   {
-    "token": "RPAREN",
-    "loc": "82:28-82:29"
+    "token": "FAT_ARROW",
+    "loc": "82:25-82:27"
   },
   {
     "token": "LBRACE",
-    "loc": "82:30-82:31"
+    "loc": "82:28-82:29"
   },
   {
     "token": "NEWLINE",
-    "loc": "82:31-82:32"
+    "loc": "82:29-82:30"
   },
   {
     "token": [
@@ -3140,32 +3132,24 @@
     "token": "LPAREN",
     "loc": "94:19-94:20"
   },
-  {
-    "token": "FN",
-    "loc": "94:20-94:22"
-  },
-  {
-    "token": "LPAREN",
-    "loc": "94:23-94:24"
-  },
   {
     "token": [
       "LIDENT",
       "self"
     ],
-    "loc": "94:24-94:28"
+    "loc": "94:20-94:24"
   },
   {
-    "token": "RPAREN",
-    "loc": "94:28-94:29"
+    "token": "FAT_ARROW",
+    "loc": "94:25-94:27"
   },
   {
     "token": "LBRACE",
-    "loc": "94:30-94:31"
+    "loc": "94:28-94:29"
   },
   {
     "token": "NEWLINE",
-    "loc": "94:31-94:32"
+    "loc": "94:29-94:30"
   },
   {
     "token": [
@@ -3185,32 +3169,24 @@
     "token": "LPAREN",
     "loc": "95:13-95:14"
   },
-  {
-    "token": "FN",
-    "loc": "95:14-95:16"
-  },
-  {
-    "token": "LPAREN",
-    "loc": "95:17-95:18"
-  },
   {
     "token": [
       "LIDENT",
       "v"
     ],
-    "loc": "95:18-95:19"
+    "loc": "95:14-95:15"
   },
   {
-    "token": "RPAREN",
-    "loc": "95:19-95:20"
+    "token": "FAT_ARROW",
+    "loc": "95:16-95:18"
   },
   {
     "token": "LBRACE",
-    "loc": "95:21-95:22"
+    "loc": "95:19-95:20"
   },
   {
     "token": "NEWLINE",
-    "loc": "95:22-95:23"
+    "loc": "95:20-95:21"
   },
   {
     "token": [
diff --git a/test/sync_test/__snapshot__/pipeline_test_handle_error_upcast.json b/test/sync_test/__snapshot__/pipeline_test_handle_error_upcast.json
index d1e518b1..cab2166f 100644
--- a/test/sync_test/__snapshot__/pipeline_test_handle_error_upcast.json
+++ b/test/sync_test/__snapshot__/pipeline_test_handle_error_upcast.json
@@ -588,7 +588,7 @@
                                     "children": {}
                                   },
                                   "kind": {
-                                    "kind": "FnKind::Lambda",
+                                    "kind": "FnKind::Arrow",
                                     "loc": null,
                                     "children": {}
                                   },
diff --git a/test/sync_test/__snapshot__/pipeline_test_handle_error_upcast.mbt b/test/sync_test/__snapshot__/pipeline_test_handle_error_upcast.mbt
index 08a6e7ef..d2ac30a1 100644
--- a/test/sync_test/__snapshot__/pipeline_test_handle_error_upcast.mbt
+++ b/test/sync_test/__snapshot__/pipeline_test_handle_error_upcast.mbt
@@ -14,6 +14,6 @@ struct Test {
 }
 
 fn main {
-  let _ : Test = { f: fn() { T::new() } }
+  let _ : Test = { f: () => T::new() }
 
 }
diff --git a/test/sync_test/__snapshot__/pipeline_test_handle_error_upcast.mbt.tokens.json b/test/sync_test/__snapshot__/pipeline_test_handle_error_upcast.mbt.tokens.json
index 8af3f230..6ae159b1 100644
--- a/test/sync_test/__snapshot__/pipeline_test_handle_error_upcast.mbt.tokens.json
+++ b/test/sync_test/__snapshot__/pipeline_test_handle_error_upcast.mbt.tokens.json
@@ -375,59 +375,51 @@
     "token": "COLON",
     "loc": "17:21-17:22"
   },
-  {
-    "token": "FN",
-    "loc": "17:23-17:25"
-  },
   {
     "token": "LPAREN",
-    "loc": "17:25-17:26"
+    "loc": "17:23-17:24"
   },
   {
     "token": "RPAREN",
-    "loc": "17:26-17:27"
+    "loc": "17:24-17:25"
   },
   {
-    "token": "LBRACE",
-    "loc": "17:28-17:29"
+    "token": "FAT_ARROW",
+    "loc": "17:26-17:28"
   },
   {
     "token": [
       "UIDENT",
       "T"
     ],
-    "loc": "17:30-17:31"
+    "loc": "17:29-17:30"
   },
   {
     "token": "COLONCOLON",
-    "loc": "17:31-17:33"
+    "loc": "17:30-17:32"
   },
   {
     "token": [
       "LIDENT",
       "new"
     ],
-    "loc": "17:33-17:36"
+    "loc": "17:32-17:35"
   },
   {
     "token": "LPAREN",
-    "loc": "17:36-17:37"
+    "loc": "17:35-17:36"
   },
   {
     "token": "RPAREN",
-    "loc": "17:37-17:38"
-  },
-  {
-    "token": "RBRACE",
-    "loc": "17:39-17:40"
+    "loc": "17:36-17:37"
   },
   {
     "token": "RBRACE",
-    "loc": "17:41-17:42"
+    "loc": "17:38-17:39"
   },
   {
     "token": "NEWLINE",
-    "loc": "17:42-17:43"
+    "loc": "17:39-17:40"
   },
   {
     "token": "NEWLINE",
diff --git a/test/sync_test/__snapshot__/pipeline_test_lexmatch_fastpath.json b/test/sync_test/__snapshot__/pipeline_test_lexmatch_fastpath.json
new file mode 100644
index 00000000..146f0319
--- /dev/null
+++ b/test/sync_test/__snapshot__/pipeline_test_lexmatch_fastpath.json
@@ -0,0 +1,14112 @@
+[
+  {
+    "kind": "Impl::TopFuncDef",
+    "loc": null,
+    "children": {
+      "fun_decl": {
+        "kind": "FunDecl",
+        "loc": null,
+        "children": {
+          "type_name": null,
+          "name": {
+            "kind": "Binder",
+            "loc": null,
+            "children": {
+              "name": "test_exact"
+            }
+          },
+          "has_error": null,
+          "is_async": null,
+          "decl_params": {
+            "kind": "FunDecl::ParameterList",
+            "loc": null,
+            "children": []
+          },
+          "quantifiers": {
+            "kind": "FunDecl::QuantifierList",
+            "loc": null,
+            "children": []
+          },
+          "return_type": {
+            "kind": "Type::Name",
+            "loc": null,
+            "children": {
+              "constr_id": {
+                "kind": "ConstrId",
+                "loc": null,
+                "children": {
+                  "id": {
+                    "kind": "LongIdent::Ident",
+                    "loc": null,
+                    "children": {
+                      "value": "Unit"
+                    }
+                  }
+                }
+              },
+              "tys": {
+                "kind": "Type::Name::TypeList",
+                "loc": null,
+                "children": []
+              }
+            }
+          },
+          "error_type": {
+            "kind": "ErrorType::DefaultErrorType",
+            "loc": null,
+            "children": {}
+          },
+          "vis": {
+            "kind": "Visibility::Default",
+            "loc": null,
+            "children": {}
+          },
+          "attrs": {
+            "kind": "FunDecl::AttrList",
+            "loc": null,
+            "children": []
+          },
+          "doc": ""
+        }
+      },
+      "decl_body": {
+        "kind": "DeclBody::DeclBody",
+        "loc": null,
+        "children": {
+          "local_types": {
+            "kind": "DeclBody::DeclBody::LocalTypeList",
+            "loc": null,
+            "children": []
+          },
+          "expr": {
+            "kind": "Expr::Let",
+            "loc": null,
+            "children": {
+              "pattern": {
+                "kind": "Pattern::Var",
+                "loc": null,
+                "children": {
+                  "value": {
+                    "kind": "Binder",
+                    "loc": null,
+                    "children": {
+                      "name": "str"
+                    }
+                  }
+                }
+              },
+              "expr": {
+                "kind": "Expr::Constant",
+                "loc": null,
+                "children": {
+                  "constant": {
+                    "kind": "Constant::String",
+                    "loc": null,
+                    "children": {
+                      "value": "hello"
+                    }
+                  }
+                }
+              },
+              "body": {
+                "kind": "Expr::Sequence",
+                "loc": null,
+                "children": {
+                  "exprs": {
+                    "kind": "Expr::Sequence::ExprList",
+                    "loc": null,
+                    "children": [
+                      {
+                        "kind": "Expr::Apply",
+                        "loc": null,
+                        "children": {
+                          "func": {
+                            "kind": "Expr::Ident",
+                            "loc": null,
+                            "children": {
+                              "id": {
+                                "kind": "Var",
+                                "loc": null,
+                                "children": {
+                                  "name": {
+                                    "kind": "LongIdent::Ident",
+                                    "loc": null,
+                                    "children": {
+                                      "value": "assert_true"
+                                    }
+                                  }
+                                }
+                              }
+                            }
+                          },
+                          "args": {
+                            "kind": "Expr::Apply::ArgumentList",
+                            "loc": null,
+                            "children": [
+                              {
+                                "kind": "Argument",
+                                "loc": null,
+                                "children": {
+                                  "value": {
+                                    "kind": "Expr::IsLexmatch",
+                                    "loc": null,
+                                    "children": {
+                                      "expr": {
+                                        "kind": "Expr::Ident",
+                                        "loc": null,
+                                        "children": {
+                                          "id": {
+                                            "kind": "Var",
+                                            "loc": null,
+                                            "children": {
+                                              "name": {
+                                                "kind": "LongIdent::Ident",
+                                                "loc": null,
+                                                "children": {
+                                                  "value": "str"
+                                                }
+                                              }
+                                            }
+                                          }
+                                        }
+                                      },
+                                      "strategy": null,
+                                      "pat": {
+                                        "kind": "Expr::IsLexmatch::PatternList",
+                                        "loc": null,
+                                        "children": [
+                                          {
+                                            "kind": "LexTopPattern::Pattern",
+                                            "loc": null,
+                                            "children": {
+                                              "value": {
+                                                "kind": "LexPattern::Regex",
+                                                "loc": null,
+                                                "children": {
+                                                  "lit": "hello"
+                                                }
+                                              }
+                                            }
+                                          }
+                                        ]
+                                      }
+                                    }
+                                  },
+                                  "kind": {
+                                    "kind": "ArgumentKind::Positional",
+                                    "loc": null,
+                                    "children": {}
+                                  }
+                                }
+                              }
+                            ]
+                          },
+                          "attr": {
+                            "kind": "ApplyAttr::NoAttr",
+                            "loc": null,
+                            "children": {}
+                          }
+                        }
+                      }
+                    ]
+                  },
+                  "last_expr": {
+                    "kind": "Expr::Apply",
+                    "loc": null,
+                    "children": {
+                      "func": {
+                        "kind": "Expr::Ident",
+                        "loc": null,
+                        "children": {
+                          "id": {
+                            "kind": "Var",
+                            "loc": null,
+                            "children": {
+                              "name": {
+                                "kind": "LongIdent::Ident",
+                                "loc": null,
+                                "children": {
+                                  "value": "assert_true"
+                                }
+                              }
+                            }
+                          }
+                        }
+                      },
+                      "args": {
+                        "kind": "Expr::Apply::ArgumentList",
+                        "loc": null,
+                        "children": [
+                          {
+                            "kind": "Argument",
+                            "loc": null,
+                            "children": {
+                              "value": {
+                                "kind": "Expr::Infix",
+                                "loc": null,
+                                "children": {
+                                  "op": {
+                                    "kind": "Var",
+                                    "loc": null,
+                                    "children": {
+                                      "name": {
+                                        "kind": "LongIdent::Ident",
+                                        "loc": null,
+                                        "children": {
+                                          "value": "&&"
+                                        }
+                                      }
+                                    }
+                                  },
+                                  "lhs": {
+                                    "kind": "Expr::IsLexmatch",
+                                    "loc": null,
+                                    "children": {
+                                      "expr": {
+                                        "kind": "Expr::Ident",
+                                        "loc": null,
+                                        "children": {
+                                          "id": {
+                                            "kind": "Var",
+                                            "loc": null,
+                                            "children": {
+                                              "name": {
+                                                "kind": "LongIdent::Ident",
+                                                "loc": null,
+                                                "children": {
+                                                  "value": "str"
+                                                }
+                                              }
+                                            }
+                                          }
+                                        }
+                                      },
+                                      "strategy": null,
+                                      "pat": {
+                                        "kind": "Expr::IsLexmatch::PatternList",
+                                        "loc": null,
+                                        "children": [
+                                          {
+                                            "kind": "LexTopPattern::Binder",
+                                            "loc": null,
+                                            "children": {
+                                              "value": {
+                                                "kind": "Binder",
+                                                "loc": null,
+                                                "children": {
+                                                  "name": "x"
+                                                }
+                                              }
+                                            }
+                                          },
+                                          {
+                                            "kind": "LexTopPattern::Pattern",
+                                            "loc": null,
+                                            "children": {
+                                              "value": {
+                                                "kind": "LexPattern::Regex",
+                                                "loc": null,
+                                                "children": {
+                                                  "lit": "^hello$"
+                                                }
+                                              }
+                                            }
+                                          },
+                                          {
+                                            "kind": "LexTopPattern::Binder",
+                                            "loc": null,
+                                            "children": {
+                                              "value": {
+                                                "kind": "Binder",
+                                                "loc": null,
+                                                "children": {
+                                                  "name": "y"
+                                                }
+                                              }
+                                            }
+                                          }
+                                        ]
+                                      }
+                                    }
+                                  },
+                                  "rhs": {
+                                    "kind": "Expr::Infix",
+                                    "loc": null,
+                                    "children": {
+                                      "op": {
+                                        "kind": "Var",
+                                        "loc": null,
+                                        "children": {
+                                          "name": {
+                                            "kind": "LongIdent::Ident",
+                                            "loc": null,
+                                            "children": {
+                                              "value": "&&"
+                                            }
+                                          }
+                                        }
+                                      },
+                                      "lhs": {
+                                        "kind": "Expr::Apply",
+                                        "loc": null,
+                                        "children": {
+                                          "func": {
+                                            "kind": "Expr::Ident",
+                                            "loc": null,
+                                            "children": {
+                                              "id": {
+                                                "kind": "Var",
+                                                "loc": null,
+                                                "children": {
+                                                  "name": {
+                                                    "kind": "LongIdent::Ident",
+                                                    "loc": null,
+                                                    "children": {
+                                                      "value": "physical_equal"
+                                                    }
+                                                  }
+                                                }
+                                              }
+                                            }
+                                          },
+                                          "args": {
+                                            "kind": "Expr::Apply::ArgumentList",
+                                            "loc": null,
+                                            "children": [
+                                              {
+                                                "kind": "Argument",
+                                                "loc": null,
+                                                "children": {
+                                                  "value": {
+                                                    "kind": "Expr::DotApply",
+                                                    "loc": null,
+                                                    "children": {
+                                                      "self": {
+                                                        "kind": "Expr::Ident",
+                                                        "loc": null,
+                                                        "children": {
+                                                          "id": {
+                                                            "kind": "Var",
+                                                            "loc": null,
+                                                            "children": {
+                                                              "name": {
+                                                                "kind": "LongIdent::Ident",
+                                                                "loc": null,
+                                                                "children": {
+                                                                  "value": "x"
+                                                                }
+                                                              }
+                                                            }
+                                                          }
+                                                        }
+                                                      },
+                                                      "method_name": {
+                                                        "kind": "Label",
+                                                        "loc": null,
+                                                        "children": {
+                                                          "name": "data"
+                                                        }
+                                                      },
+                                                      "args": {
+                                                        "kind": "Expr::DotApply::ArgList",
+                                                        "loc": null,
+                                                        "children": []
+                                                      },
+                                                      "return_self": false,
+                                                      "attr": {
+                                                        "kind": "ApplyAttr::NoAttr",
+                                                        "loc": null,
+                                                        "children": {}
+                                                      }
+                                                    }
+                                                  },
+                                                  "kind": {
+                                                    "kind": "ArgumentKind::Positional",
+                                                    "loc": null,
+                                                    "children": {}
+                                                  }
+                                                }
+                                              },
+                                              {
+                                                "kind": "Argument",
+                                                "loc": null,
+                                                "children": {
+                                                  "value": {
+                                                    "kind": "Expr::Ident",
+                                                    "loc": null,
+                                                    "children": {
+                                                      "id": {
+                                                        "kind": "Var",
+                                                        "loc": null,
+                                                        "children": {
+                                                          "name": {
+                                                            "kind": "LongIdent::Ident",
+                                                            "loc": null,
+                                                            "children": {
+                                                              "value": "str"
+                                                            }
+                                                          }
+                                                        }
+                                                      }
+                                                    }
+                                                  },
+                                                  "kind": {
+                                                    "kind": "ArgumentKind::Positional",
+                                                    "loc": null,
+                                                    "children": {}
+                                                  }
+                                                }
+                                              }
+                                            ]
+                                          },
+                                          "attr": {
+                                            "kind": "ApplyAttr::NoAttr",
+                                            "loc": null,
+                                            "children": {}
+                                          }
+                                        }
+                                      },
+                                      "rhs": {
+                                        "kind": "Expr::Infix",
+                                        "loc": null,
+                                        "children": {
+                                          "op": {
+                                            "kind": "Var",
+                                            "loc": null,
+                                            "children": {
+                                              "name": {
+                                                "kind": "LongIdent::Ident",
+                                                "loc": null,
+                                                "children": {
+                                                  "value": "&&"
+                                                }
+                                              }
+                                            }
+                                          },
+                                          "lhs": {
+                                            "kind": "Expr::Infix",
+                                            "loc": null,
+                                            "children": {
+                                              "op": {
+                                                "kind": "Var",
+                                                "loc": null,
+                                                "children": {
+                                                  "name": {
+                                                    "kind": "LongIdent::Ident",
+                                                    "loc": null,
+                                                    "children": {
+                                                      "value": "=="
+                                                    }
+                                                  }
+                                                }
+                                              },
+                                              "lhs": {
+                                                "kind": "Expr::DotApply",
+                                                "loc": null,
+                                                "children": {
+                                                  "self": {
+                                                    "kind": "Expr::Ident",
+                                                    "loc": null,
+                                                    "children": {
+                                                      "id": {
+                                                        "kind": "Var",
+                                                        "loc": null,
+                                                        "children": {
+                                                          "name": {
+                                                            "kind": "LongIdent::Ident",
+                                                            "loc": null,
+                                                            "children": {
+                                                              "value": "x"
+                                                            }
+                                                          }
+                                                        }
+                                                      }
+                                                    }
+                                                  },
+                                                  "method_name": {
+                                                    "kind": "Label",
+                                                    "loc": null,
+                                                    "children": {
+                                                      "name": "start_offset"
+                                                    }
+                                                  },
+                                                  "args": {
+                                                    "kind": "Expr::DotApply::ArgList",
+                                                    "loc": null,
+                                                    "children": []
+                                                  },
+                                                  "return_self": false,
+                                                  "attr": {
+                                                    "kind": "ApplyAttr::NoAttr",
+                                                    "loc": null,
+                                                    "children": {}
+                                                  }
+                                                }
+                                              },
+                                              "rhs": {
+                                                "kind": "Expr::Constant",
+                                                "loc": null,
+                                                "children": {
+                                                  "constant": {
+                                                    "kind": "Constant::Int",
+                                                    "loc": null,
+                                                    "children": {
+                                                      "value": "0"
+                                                    }
+                                                  }
+                                                }
+                                              }
+                                            }
+                                          },
+                                          "rhs": {
+                                            "kind": "Expr::Infix",
+                                            "loc": null,
+                                            "children": {
+                                              "op": {
+                                                "kind": "Var",
+                                                "loc": null,
+                                                "children": {
+                                                  "name": {
+                                                    "kind": "LongIdent::Ident",
+                                                    "loc": null,
+                                                    "children": {
+                                                      "value": "&&"
+                                                    }
+                                                  }
+                                                }
+                                              },
+                                              "lhs": {
+                                                "kind": "Expr::Infix",
+                                                "loc": null,
+                                                "children": {
+                                                  "op": {
+                                                    "kind": "Var",
+                                                    "loc": null,
+                                                    "children": {
+                                                      "name": {
+                                                        "kind": "LongIdent::Ident",
+                                                        "loc": null,
+                                                        "children": {
+                                                          "value": "=="
+                                                        }
+                                                      }
+                                                    }
+                                                  },
+                                                  "lhs": {
+                                                    "kind": "Expr::DotApply",
+                                                    "loc": null,
+                                                    "children": {
+                                                      "self": {
+                                                        "kind": "Expr::Ident",
+                                                        "loc": null,
+                                                        "children": {
+                                                          "id": {
+                                                            "kind": "Var",
+                                                            "loc": null,
+                                                            "children": {
+                                                              "name": {
+                                                                "kind": "LongIdent::Ident",
+                                                                "loc": null,
+                                                                "children": {
+                                                                  "value": "x"
+                                                                }
+                                                              }
+                                                            }
+                                                          }
+                                                        }
+                                                      },
+                                                      "method_name": {
+                                                        "kind": "Label",
+                                                        "loc": null,
+                                                        "children": {
+                                                          "name": "length"
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+                        ]
+                      },
+                      "attr": {
+                        "kind": "ApplyAttr::NoAttr",
+                        "loc": null,
+                        "children": {}
+                      }
+                    }
+                  },
+                  {
+                    "kind": "Expr::Apply",
+                    "loc": null,
+                    "children": {
+                      "func": {
+                        "kind": "Expr::Ident",
+                        "loc": null,
+                        "children": {
+                          "id": {
+                            "kind": "Var",
+                            "loc": null,
+                            "children": {
+                              "name": {
+                                "kind": "LongIdent::Ident",
+                                "loc": null,
+                                "children": {
+                                  "value": "println"
+                                }
+                              }
+                            }
+                          }
+                        }
+                      },
+                      "args": {
+                        "kind": "Expr::Apply::ArgumentList",
+                        "loc": null,
+                        "children": [
+                          {
+                            "kind": "Argument",
+                            "loc": null,
+                            "children": {
+                              "value": {
+                                "kind": "Expr::Constant",
+                                "loc": null,
+                                "children": {
+                                  "constant": {
+                                    "kind": "Constant::String",
+                                    "loc": null,
+                                    "children": {
+                                      "value": "test_suffix"
+                                    }
+                                  }
+                                }
+                              },
+                              "kind": {
+                                "kind": "ArgumentKind::Positional",
+                                "loc": null,
+                                "children": {}
+                              }
+                            }
+                          }
+                        ]
+                      },
+                      "attr": {
+                        "kind": "ApplyAttr::NoAttr",
+                        "loc": null,
+                        "children": {}
+                      }
+                    }
+                  },
+                  {
+                    "kind": "Expr::Apply",
+                    "loc": null,
+                    "children": {
+                      "func": {
+                        "kind": "Expr::Ident",
+                        "loc": null,
+                        "children": {
+                          "id": {
+                            "kind": "Var",
+                            "loc": null,
+                            "children": {
+                              "name": {
+                                "kind": "LongIdent::Ident",
+                                "loc": null,
+                                "children": {
+                                  "value": "println"
+                                }
+                              }
+                            }
+                          }
+                        }
+                      },
+                      "args": {
+                        "kind": "Expr::Apply::ArgumentList",
+                        "loc": null,
+                        "children": [
+                          {
+                            "kind": "Argument",
+                            "loc": null,
+                            "children": {
+                              "value": {
+                                "kind": "Expr::TryOperator",
+                                "loc": null,
+                                "children": {
+                                  "body": {
+                                    "kind": "Expr::Apply",
+                                    "loc": null,
+                                    "children": {
+                                      "func": {
+                                        "kind": "Expr::Ident",
+                                        "loc": null,
+                                        "children": {
+                                          "id": {
+                                            "kind": "Var",
+                                            "loc": null,
+                                            "children": {
+                                              "name": {
+                                                "kind": "LongIdent::Ident",
+                                                "loc": null,
+                                                "children": {
+                                                  "value": "test_suffix"
+                                                }
+                                              }
+                                            }
+                                          }
+                                        }
+                                      },
+                                      "args": {
+                                        "kind": "Expr::Apply::ArgumentList",
+                                        "loc": null,
+                                        "children": []
+                                      },
+                                      "attr": {
+                                        "kind": "ApplyAttr::NoAttr",
+                                        "loc": null,
+                                        "children": {}
+                                      }
+                                    }
+                                  },
+                                  "kind": {
+                                    "kind": "TryOperatorKind::Question",
+                                    "loc": null,
+                                    "children": {}
+                                  }
+                                }
+                              },
+                              "kind": {
+                                "kind": "ArgumentKind::Positional",
+                                "loc": null,
+                                "children": {}
+                              }
+                            }
+                          }
+                        ]
+                      },
+                      "attr": {
+                        "kind": "ApplyAttr::NoAttr",
+                        "loc": null,
+                        "children": {}
+                      }
+                    }
+                  },
+                  {
+                    "kind": "Expr::Apply",
+                    "loc": null,
+                    "children": {
+                      "func": {
+                        "kind": "Expr::Ident",
+                        "loc": null,
+                        "children": {
+                          "id": {
+                            "kind": "Var",
+                            "loc": null,
+                            "children": {
+                              "name": {
+                                "kind": "LongIdent::Ident",
+                                "loc": null,
+                                "children": {
+                                  "value": "println"
+                                }
+                              }
+                            }
+                          }
+                        }
+                      },
+                      "args": {
+                        "kind": "Expr::Apply::ArgumentList",
+                        "loc": null,
+                        "children": [
+                          {
+                            "kind": "Argument",
+                            "loc": null,
+                            "children": {
+                              "value": {
+                                "kind": "Expr::Constant",
+                                "loc": null,
+                                "children": {
+                                  "constant": {
+                                    "kind": "Constant::String",
+                                    "loc": null,
+                                    "children": {
+                                      "value": "test_suffix_bytes"
+                                    }
+                                  }
+                                }
+                              },
+                              "kind": {
+                                "kind": "ArgumentKind::Positional",
+                                "loc": null,
+                                "children": {}
+                              }
+                            }
+                          }
+                        ]
+                      },
+                      "attr": {
+                        "kind": "ApplyAttr::NoAttr",
+                        "loc": null,
+                        "children": {}
+                      }
+                    }
+                  },
+                  {
+                    "kind": "Expr::Apply",
+                    "loc": null,
+                    "children": {
+                      "func": {
+                        "kind": "Expr::Ident",
+                        "loc": null,
+                        "children": {
+                          "id": {
+                            "kind": "Var",
+                            "loc": null,
+                            "children": {
+                              "name": {
+                                "kind": "LongIdent::Ident",
+                                "loc": null,
+                                "children": {
+                                  "value": "println"
+                                }
+                              }
+                            }
+                          }
+                        }
+                      },
+                      "args": {
+                        "kind": "Expr::Apply::ArgumentList",
+                        "loc": null,
+                        "children": [
+                          {
+                            "kind": "Argument",
+                            "loc": null,
+                            "children": {
+                              "value": {
+                                "kind": "Expr::TryOperator",
+                                "loc": null,
+                                "children": {
+                                  "body": {
+                                    "kind": "Expr::Apply",
+                                    "loc": null,
+                                    "children": {
+                                      "func": {
+                                        "kind": "Expr::Ident",
+                                        "loc": null,
+                                        "children": {
+                                          "id": {
+                                            "kind": "Var",
+                                            "loc": null,
+                                            "children": {
+                                              "name": {
+                                                "kind": "LongIdent::Ident",
+                                                "loc": null,
+                                                "children": {
+                                                  "value": "test_suffix_bytes"
+                                                }
+                                              }
+                                            }
+                                          }
+                                        }
+                                      },
+                                      "args": {
+                                        "kind": "Expr::Apply::ArgumentList",
+                                        "loc": null,
+                                        "children": []
+                                      },
+                                      "attr": {
+                                        "kind": "ApplyAttr::NoAttr",
+                                        "loc": null,
+                                        "children": {}
+                                      }
+                                    }
+                                  },
+                                  "kind": {
+                                    "kind": "TryOperatorKind::Question",
+                                    "loc": null,
+                                    "children": {}
+                                  }
+                                }
+                              },
+                              "kind": {
+                                "kind": "ArgumentKind::Positional",
+                                "loc": null,
+                                "children": {}
+                              }
+                            }
+                          }
+                        ]
+                      },
+                      "attr": {
+                        "kind": "ApplyAttr::NoAttr",
+                        "loc": null,
+                        "children": {}
+                      }
+                    }
+                  },
+                  {
+                    "kind": "Expr::Apply",
+                    "loc": null,
+                    "children": {
+                      "func": {
+                        "kind": "Expr::Ident",
+                        "loc": null,
+                        "children": {
+                          "id": {
+                            "kind": "Var",
+                            "loc": null,
+                            "children": {
+                              "name": {
+                                "kind": "LongIdent::Ident",
+                                "loc": null,
+                                "children": {
+                                  "value": "println"
+                                }
+                              }
+                            }
+                          }
+                        }
+                      },
+                      "args": {
+                        "kind": "Expr::Apply::ArgumentList",
+                        "loc": null,
+                        "children": [
+                          {
+                            "kind": "Argument",
+                            "loc": null,
+                            "children": {
+                              "value": {
+                                "kind": "Expr::Constant",
+                                "loc": null,
+                                "children": {
+                                  "constant": {
+                                    "kind": "Constant::String",
+                                    "loc": null,
+                                    "children": {
+                                      "value": "test_search"
+                                    }
+                                  }
+                                }
+                              },
+                              "kind": {
+                                "kind": "ArgumentKind::Positional",
+                                "loc": null,
+                                "children": {}
+                              }
+                            }
+                          }
+                        ]
+                      },
+                      "attr": {
+                        "kind": "ApplyAttr::NoAttr",
+                        "loc": null,
+                        "children": {}
+                      }
+                    }
+                  },
+                  {
+                    "kind": "Expr::Apply",
+                    "loc": null,
+                    "children": {
+                      "func": {
+                        "kind": "Expr::Ident",
+                        "loc": null,
+                        "children": {
+                          "id": {
+                            "kind": "Var",
+                            "loc": null,
+                            "children": {
+                              "name": {
+                                "kind": "LongIdent::Ident",
+                                "loc": null,
+                                "children": {
+                                  "value": "println"
+                                }
+                              }
+                            }
+                          }
+                        }
+                      },
+                      "args": {
+                        "kind": "Expr::Apply::ArgumentList",
+                        "loc": null,
+                        "children": [
+                          {
+                            "kind": "Argument",
+                            "loc": null,
+                            "children": {
+                              "value": {
+                                "kind": "Expr::TryOperator",
+                                "loc": null,
+                                "children": {
+                                  "body": {
+                                    "kind": "Expr::Apply",
+                                    "loc": null,
+                                    "children": {
+                                      "func": {
+                                        "kind": "Expr::Ident",
+                                        "loc": null,
+                                        "children": {
+                                          "id": {
+                                            "kind": "Var",
+                                            "loc": null,
+                                            "children": {
+                                              "name": {
+                                                "kind": "LongIdent::Ident",
+                                                "loc": null,
+                                                "children": {
+                                                  "value": "test_search"
+                                                }
+                                              }
+                                            }
+                                          }
+                                        }
+                                      },
+                                      "args": {
+                                        "kind": "Expr::Apply::ArgumentList",
+                                        "loc": null,
+                                        "children": []
+                                      },
+                                      "attr": {
+                                        "kind": "ApplyAttr::NoAttr",
+                                        "loc": null,
+                                        "children": {}
+                                      }
+                                    }
+                                  },
+                                  "kind": {
+                                    "kind": "TryOperatorKind::Question",
+                                    "loc": null,
+                                    "children": {}
+                                  }
+                                }
+                              },
+                              "kind": {
+                                "kind": "ArgumentKind::Positional",
+                                "loc": null,
+                                "children": {}
+                              }
+                            }
+                          }
+                        ]
+                      },
+                      "attr": {
+                        "kind": "ApplyAttr::NoAttr",
+                        "loc": null,
+                        "children": {}
+                      }
+                    }
+                  },
+                  {
+                    "kind": "Expr::Apply",
+                    "loc": null,
+                    "children": {
+                      "func": {
+                        "kind": "Expr::Ident",
+                        "loc": null,
+                        "children": {
+                          "id": {
+                            "kind": "Var",
+                            "loc": null,
+                            "children": {
+                              "name": {
+                                "kind": "LongIdent::Ident",
+                                "loc": null,
+                                "children": {
+                                  "value": "println"
+                                }
+                              }
+                            }
+                          }
+                        }
+                      },
+                      "args": {
+                        "kind": "Expr::Apply::ArgumentList",
+                        "loc": null,
+                        "children": [
+                          {
+                            "kind": "Argument",
+                            "loc": null,
+                            "children": {
+                              "value": {
+                                "kind": "Expr::Constant",
+                                "loc": null,
+                                "children": {
+                                  "constant": {
+                                    "kind": "Constant::String",
+                                    "loc": null,
+                                    "children": {
+                                      "value": "test_search_bytes"
+                                    }
+                                  }
+                                }
+                              },
+                              "kind": {
+                                "kind": "ArgumentKind::Positional",
+                                "loc": null,
+                                "children": {}
+                              }
+                            }
+                          }
+                        ]
+                      },
+                      "attr": {
+                        "kind": "ApplyAttr::NoAttr",
+                        "loc": null,
+                        "children": {}
+                      }
+                    }
+                  }
+                ]
+              },
+              "last_expr": {
+                "kind": "Expr::Apply",
+                "loc": null,
+                "children": {
+                  "func": {
+                    "kind": "Expr::Ident",
+                    "loc": null,
+                    "children": {
+                      "id": {
+                        "kind": "Var",
+                        "loc": null,
+                        "children": {
+                          "name": {
+                            "kind": "LongIdent::Ident",
+                            "loc": null,
+                            "children": {
+                              "value": "println"
+                            }
+                          }
+                        }
+                      }
+                    }
+                  },
+                  "args": {
+                    "kind": "Expr::Apply::ArgumentList",
+                    "loc": null,
+                    "children": [
+                      {
+                        "kind": "Argument",
+                        "loc": null,
+                        "children": {
+                          "value": {
+                            "kind": "Expr::TryOperator",
+                            "loc": null,
+                            "children": {
+                              "body": {
+                                "kind": "Expr::Apply",
+                                "loc": null,
+                                "children": {
+                                  "func": {
+                                    "kind": "Expr::Ident",
+                                    "loc": null,
+                                    "children": {
+                                      "id": {
+                                        "kind": "Var",
+                                        "loc": null,
+                                        "children": {
+                                          "name": {
+                                            "kind": "LongIdent::Ident",
+                                            "loc": null,
+                                            "children": {
+                                              "value": "test_search_bytes"
+                                            }
+                                          }
+                                        }
+                                      }
+                                    }
+                                  },
+                                  "args": {
+                                    "kind": "Expr::Apply::ArgumentList",
+                                    "loc": null,
+                                    "children": []
+                                  },
+                                  "attr": {
+                                    "kind": "ApplyAttr::NoAttr",
+                                    "loc": null,
+                                    "children": {}
+                                  }
+                                }
+                              },
+                              "kind": {
+                                "kind": "TryOperatorKind::Question",
+                                "loc": null,
+                                "children": {}
+                              }
+                            }
+                          },
+                          "kind": {
+                            "kind": "ArgumentKind::Positional",
+                            "loc": null,
+                            "children": {}
+                          }
+                        }
+                      }
+                    ]
+                  },
+                  "attr": {
+                    "kind": "ApplyAttr::NoAttr",
+                    "loc": null,
+                    "children": {}
+                  }
+                }
+              }
+            }
+          }
+        }
+      }
+    }
+  }
+]
\ No newline at end of file
diff --git a/test/sync_test/__snapshot__/pipeline_test_lexmatch_fastpath.mbt b/test/sync_test/__snapshot__/pipeline_test_lexmatch_fastpath.mbt
new file mode 100644
index 00000000..792269a3
--- /dev/null
+++ b/test/sync_test/__snapshot__/pipeline_test_lexmatch_fastpath.mbt
@@ -0,0 +1,213 @@
+///|
+fn test_exact() -> Unit raise {
+  let str = "hello"
+  assert_true(str lexmatch? "hello")
+  assert_true(
+    str lexmatch? (x, "^hello$", y) &&
+    physical_equal(x.data(), str) &&
+    x.start_offset() == 0 &&
+    x.length() == 0 &&
+    physical_equal(y.data(), str) &&
+    y.start_offset() == 5 &&
+    y.length() == 0,
+  )
+}
+
+///|
+fn test_exact_bytes() -> Unit raise {
+  let str = b"hello"
+  assert_true(str lexmatch? "hello")
+  assert_true(
+    str lexmatch? (x, "^hello$", y) &&
+    physical_equal(x.data(), str) &&
+    x.start_offset() == 0 &&
+    x.length() == 0 &&
+    physical_equal(y.data(), str) &&
+    y.start_offset() == 5 &&
+    y.length() == 0,
+  )
+}
+
+///|
+fn test_empty() -> Unit raise {
+  let str = "hello"
+  assert_false(str lexmatch? "")
+  assert_true(
+    str lexmatch? (x, "") &&
+    physical_equal(x.data(), str) &&
+    x.start_offset() == 0 &&
+    x.length() == 5,
+  )
+  assert_true(
+    str lexmatch? ("", y) &&
+    physical_equal(y.data(), str) &&
+    y.start_offset() == 0 &&
+    y.length() == 5,
+  )
+  assert_true(
+    str lexmatch? (x, "", y) &&
+    physical_equal(x.data(), str) &&
+    x.start_offset() == 0 &&
+    x.length() == 0 &&
+    y.start_offset() == 0 &&
+    y.length() == 5,
+  )
+}
+
+///|
+fn test_empty_bytes() -> Unit raise {
+  let str = b"hello"
+  assert_false(str lexmatch? "")
+  assert_true(
+    str lexmatch? (x, "") &&
+    physical_equal(x.data(), str) &&
+    x.start_offset() == 0 &&
+    x.length() == 5,
+  )
+  assert_true(
+    str lexmatch? ("", y) &&
+    physical_equal(y.data(), str) &&
+    y.start_offset() == 0 &&
+    y.length() == 5,
+  )
+  assert_true(
+    str lexmatch? (x, "", y) &&
+    physical_equal(x.data(), str) &&
+    x.start_offset() == 0 &&
+    x.length() == 0 &&
+    y.start_offset() == 0 &&
+    y.length() == 5,
+  )
+}
+
+///|
+fn test_prefix() -> Unit raise {
+  let str = "hello world"
+  assert_true(
+    str lexmatch? ("hello", y) &&
+    physical_equal(y.data(), str) &&
+    y.start_offset() == 5 &&
+    y.length() == 6,
+  )
+  assert_true(
+    str lexmatch? (x, "^hello", y) &&
+    physical_equal(x.data(), str) &&
+    x.start_offset() == 0 &&
+    x.length() == 0 &&
+    physical_equal(y.data(), str) &&
+    y.start_offset() == 5 &&
+    y.length() == 6,
+  )
+}
+
+///|
+fn test_prefix_bytes() -> Unit raise {
+  let str = b"hello world"
+  assert_true(
+    str lexmatch? ("hello", y) &&
+    physical_equal(y.data(), str) &&
+    y.start_offset() == 5 &&
+    y.length() == 6,
+  )
+  assert_true(
+    str lexmatch? (x, "hello", y) &&
+    physical_equal(x.data(), str) &&
+    x.start_offset() == 0 &&
+    x.length() == 0 &&
+    physical_equal(y.data(), str) &&
+    y.start_offset() == 5 &&
+    y.length() == 6,
+  )
+}
+
+///|
+fn test_suffix() -> Unit raise {
+  let str = "hello 中国𠮷"
+  assert_true(
+    str lexmatch? (x, "中国𠮷") &&
+    physical_equal(x.data(), str) &&
+    x.start_offset() == 0 &&
+    x.length() == 6,
+  )
+  assert_true(
+    str lexmatch? (x, "中国𠮷$", y) &&
+    physical_equal(x.data(), str) &&
+    x.start_offset() == 0 &&
+    x.length() == 6 &&
+    physical_equal(y.data(), str) &&
+    y.start_offset() == 10 &&
+    y.length() == 0,
+  )
+}
+
+///|
+fn test_suffix_bytes() -> Unit raise {
+  let str = b"hello world"
+  assert_true(
+    str lexmatch? (x, "world") &&
+    physical_equal(x.data(), str) &&
+    x.start_offset() == 0 &&
+    x.length() == 6,
+  )
+  assert_true(
+    str lexmatch? (x, "world$", y) &&
+    physical_equal(x.data(), str) &&
+    x.start_offset() == 0 &&
+    x.length() == 6 &&
+    physical_equal(y.data(), str) &&
+    y.start_offset() == 11 &&
+    y.length() == 0,
+  )
+}
+
+///|
+fn test_search() -> Unit raise {
+  let str = "hello"
+  assert_true(
+    str lexmatch? (x, "el", y) &&
+    physical_equal(x.data(), str) &&
+    x.start_offset() == 0 &&
+    x.length() == 1 &&
+    physical_equal(y.data(), str) &&
+    y.start_offset() == 3 &&
+    y.length() == 2,
+  )
+}
+
+///|
+fn test_search_bytes() -> Unit raise {
+  let str = b"hello"
+  assert_true(
+    str lexmatch? (x, "el", y) &&
+    physical_equal(x.data(), str) &&
+    x.start_offset() == 0 &&
+    x.length() == 1 &&
+    physical_equal(y.data(), str) &&
+    y.start_offset() == 3 &&
+    y.length() == 2,
+  )
+}
+
+///|
+fn main {
+  println("test_exact")
+  println(try? test_exact())
+  println("test_exact_bytes")
+  println(try? test_exact_bytes())
+  println("test_empty")
+  println(try? test_empty())
+  println("test_empty_bytes")
+  println(try? test_empty_bytes())
+  println("test_prefix")
+  println(try? test_prefix())
+  println("test_prefix_bytes")
+  println(try? test_prefix_bytes())
+  println("test_suffix")
+  println(try? test_suffix())
+  println("test_suffix_bytes")
+  println(try? test_suffix_bytes())
+  println("test_search")
+  println(try? test_search())
+  println("test_search_bytes")
+  println(try? test_search_bytes())
+}
diff --git a/test/sync_test/__snapshot__/pipeline_test_lexmatch_fastpath.mbt.tokens.json b/test/sync_test/__snapshot__/pipeline_test_lexmatch_fastpath.mbt.tokens.json
new file mode 100644
index 00000000..26ebcef7
--- /dev/null
+++ b/test/sync_test/__snapshot__/pipeline_test_lexmatch_fastpath.mbt.tokens.json
@@ -0,0 +1,7470 @@
+[
+  {
+    "token": [
+      "COMMENT",
+      {
+        "content": "///|",
+        "kind": [
+          "Ownline",
+          {
+            "leading_blank_line": false,
+            "trailing_blank_line": false
+          }
+        ],
+        "consumed_by_docstring": false
+      }
+    ],
+    "loc": "1:1-1:5"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "1:5-1:6"
+  },
+  {
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+    "loc": "199:10-199:11"
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+    "token": [
+      "STRING",
+      "test_empty_bytes"
+    ],
+    "loc": "199:11-199:29"
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+    "token": "RPAREN",
+    "loc": "199:29-199:30"
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+      "SEMI",
+      false
+    ],
+    "loc": "199:30-199:30"
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+    "token": "NEWLINE",
+    "loc": "199:30-199:31"
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+    "token": [
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+      "println"
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+  },
+  {
+    "token": "LPAREN",
+    "loc": "200:10-200:11"
+  },
+  {
+    "token": "TRY_QUESTION",
+    "loc": "200:11-200:15"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "test_empty_bytes"
+    ],
+    "loc": "200:16-200:32"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "200:32-200:33"
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+    "loc": "200:33-200:34"
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+    "token": "RPAREN",
+    "loc": "200:34-200:35"
+  },
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+    "token": [
+      "SEMI",
+      false
+    ],
+    "loc": "200:35-200:35"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "200:35-200:36"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "println"
+    ],
+    "loc": "201:3-201:10"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "201:10-201:11"
+  },
+  {
+    "token": [
+      "STRING",
+      "test_prefix"
+    ],
+    "loc": "201:11-201:24"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "201:24-201:25"
+  },
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+    "token": [
+      "SEMI",
+      false
+    ],
+    "loc": "201:25-201:25"
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+    "token": "NEWLINE",
+    "loc": "201:25-201:26"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "println"
+    ],
+    "loc": "202:3-202:10"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "202:10-202:11"
+  },
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+    "token": "TRY_QUESTION",
+    "loc": "202:11-202:15"
+  },
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+    "token": [
+      "LIDENT",
+      "test_prefix"
+    ],
+    "loc": "202:16-202:27"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "202:27-202:28"
+  },
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+    "token": "RPAREN",
+    "loc": "202:28-202:29"
+  },
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+    "token": "RPAREN",
+    "loc": "202:29-202:30"
+  },
+  {
+    "token": [
+      "SEMI",
+      false
+    ],
+    "loc": "202:30-202:30"
+  },
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+    "token": "NEWLINE",
+    "loc": "202:30-202:31"
+  },
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+    "token": [
+      "LIDENT",
+      "println"
+    ],
+    "loc": "203:3-203:10"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "203:10-203:11"
+  },
+  {
+    "token": [
+      "STRING",
+      "test_prefix_bytes"
+    ],
+    "loc": "203:11-203:30"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "203:30-203:31"
+  },
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+    "token": [
+      "SEMI",
+      false
+    ],
+    "loc": "203:31-203:31"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "203:31-203:32"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "println"
+    ],
+    "loc": "204:3-204:10"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "204:10-204:11"
+  },
+  {
+    "token": "TRY_QUESTION",
+    "loc": "204:11-204:15"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "test_prefix_bytes"
+    ],
+    "loc": "204:16-204:33"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "204:33-204:34"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "204:34-204:35"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "204:35-204:36"
+  },
+  {
+    "token": [
+      "SEMI",
+      false
+    ],
+    "loc": "204:36-204:36"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "204:36-204:37"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "println"
+    ],
+    "loc": "205:3-205:10"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "205:10-205:11"
+  },
+  {
+    "token": [
+      "STRING",
+      "test_suffix"
+    ],
+    "loc": "205:11-205:24"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "205:24-205:25"
+  },
+  {
+    "token": [
+      "SEMI",
+      false
+    ],
+    "loc": "205:25-205:25"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "205:25-205:26"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "println"
+    ],
+    "loc": "206:3-206:10"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "206:10-206:11"
+  },
+  {
+    "token": "TRY_QUESTION",
+    "loc": "206:11-206:15"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "test_suffix"
+    ],
+    "loc": "206:16-206:27"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "206:27-206:28"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "206:28-206:29"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "206:29-206:30"
+  },
+  {
+    "token": [
+      "SEMI",
+      false
+    ],
+    "loc": "206:30-206:30"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "206:30-206:31"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "println"
+    ],
+    "loc": "207:3-207:10"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "207:10-207:11"
+  },
+  {
+    "token": [
+      "STRING",
+      "test_suffix_bytes"
+    ],
+    "loc": "207:11-207:30"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "207:30-207:31"
+  },
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+    "token": [
+      "SEMI",
+      false
+    ],
+    "loc": "207:31-207:31"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "207:31-207:32"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "println"
+    ],
+    "loc": "208:3-208:10"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "208:10-208:11"
+  },
+  {
+    "token": "TRY_QUESTION",
+    "loc": "208:11-208:15"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "test_suffix_bytes"
+    ],
+    "loc": "208:16-208:33"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "208:33-208:34"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "208:34-208:35"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "208:35-208:36"
+  },
+  {
+    "token": [
+      "SEMI",
+      false
+    ],
+    "loc": "208:36-208:36"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "208:36-208:37"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "println"
+    ],
+    "loc": "209:3-209:10"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "209:10-209:11"
+  },
+  {
+    "token": [
+      "STRING",
+      "test_search"
+    ],
+    "loc": "209:11-209:24"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "209:24-209:25"
+  },
+  {
+    "token": [
+      "SEMI",
+      false
+    ],
+    "loc": "209:25-209:25"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "209:25-209:26"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "println"
+    ],
+    "loc": "210:3-210:10"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "210:10-210:11"
+  },
+  {
+    "token": "TRY_QUESTION",
+    "loc": "210:11-210:15"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "test_search"
+    ],
+    "loc": "210:16-210:27"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "210:27-210:28"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "210:28-210:29"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "210:29-210:30"
+  },
+  {
+    "token": [
+      "SEMI",
+      false
+    ],
+    "loc": "210:30-210:30"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "210:30-210:31"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "println"
+    ],
+    "loc": "211:3-211:10"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "211:10-211:11"
+  },
+  {
+    "token": [
+      "STRING",
+      "test_search_bytes"
+    ],
+    "loc": "211:11-211:30"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "211:30-211:31"
+  },
+  {
+    "token": [
+      "SEMI",
+      false
+    ],
+    "loc": "211:31-211:31"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "211:31-211:32"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "println"
+    ],
+    "loc": "212:3-212:10"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "212:10-212:11"
+  },
+  {
+    "token": "TRY_QUESTION",
+    "loc": "212:11-212:15"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "test_search_bytes"
+    ],
+    "loc": "212:16-212:33"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "212:33-212:34"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "212:34-212:35"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "212:35-212:36"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "212:36-212:37"
+  },
+  {
+    "token": "RBRACE",
+    "loc": "213:1-213:2"
+  },
+  {
+    "token": [
+      "SEMI",
+      false
+    ],
+    "loc": "213:2-213:2"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "213:2-213:3"
+  },
+  {
+    "token": "EOF",
+    "loc": "214:1-214:1"
+  }
+]
\ No newline at end of file
diff --git a/test/sync_test/__snapshot__/pipeline_test_lexmatch_first.json b/test/sync_test/__snapshot__/pipeline_test_lexmatch_first.json
index 0c34fc66..319d6286 100644
--- a/test/sync_test/__snapshot__/pipeline_test_lexmatch_first.json
+++ b/test/sync_test/__snapshot__/pipeline_test_lexmatch_first.json
@@ -4380,7 +4380,468 @@
             "kind": "Binder",
             "loc": null,
             "children": {
-              "name": "init"
+              "name": "test_emoji"
+            }
+          },
+          "has_error": null,
+          "is_async": null,
+          "decl_params": {
+            "kind": "FunDecl::ParameterList",
+            "loc": null,
+            "children": []
+          },
+          "quantifiers": {
+            "kind": "FunDecl::QuantifierList",
+            "loc": null,
+            "children": []
+          },
+          "return_type": {
+            "kind": "Type::Name",
+            "loc": null,
+            "children": {
+              "constr_id": {
+                "kind": "ConstrId",
+                "loc": null,
+                "children": {
+                  "id": {
+                    "kind": "LongIdent::Ident",
+                    "loc": null,
+                    "children": {
+                      "value": "Unit"
+                    }
+                  }
+                }
+              },
+              "tys": {
+                "kind": "Type::Name::TypeList",
+                "loc": null,
+                "children": []
+              }
+            }
+          },
+          "error_type": {
+            "kind": "ErrorType::DefaultErrorType",
+            "loc": null,
+            "children": {}
+          },
+          "vis": {
+            "kind": "Visibility::Default",
+            "loc": null,
+            "children": {}
+          },
+          "attrs": {
+            "kind": "FunDecl::AttrList",
+            "loc": null,
+            "children": []
+          },
+          "doc": ""
+        }
+      },
+      "decl_body": {
+        "kind": "DeclBody::DeclBody",
+        "loc": null,
+        "children": {
+          "local_types": {
+            "kind": "DeclBody::DeclBody::LocalTypeList",
+            "loc": null,
+            "children": []
+          },
+          "expr": {
+            "kind": "Expr::Lexmatch",
+            "loc": null,
+            "children": {
+              "strategy": null,
+              "expr": {
+                "kind": "Expr::Constant",
+                "loc": null,
+                "children": {
+                  "constant": {
+                    "kind": "Constant::String",
+                    "loc": null,
+                    "children": {
+                      "value": "😋😋"
+                    }
+                  }
+                }
+              },
+              "cases": {
+                "kind": "Expr::Lexmatch::CaseList",
+                "loc": null,
+                "children": [
+                  {
+                    "kind": "LexCase",
+                    "loc": null,
+                    "children": {
+                      "pat": {
+                        "kind": "LexCase::PatternList",
+                        "loc": null,
+                        "children": [
+                          {
+                            "kind": "LexTopPattern::Pattern",
+                            "loc": null,
+                            "children": {
+                              "value": {
+                                "kind": "LexPattern::Sequence",
+                                "loc": null,
+                                "children": {
+                                  "pats": {
+                                    "kind": "LexPattern::Sequence::PatternList",
+                                    "loc": null,
+                                    "children": [
+                                      {
+                                        "kind": "LexPattern::Alias",
+                                        "loc": null,
+                                        "children": {
+                                          "pat": {
+                                            "kind": "LexPattern::Regex",
+                                            "loc": null,
+                                            "children": {
+                                              "lit": "."
+                                            }
+                                          },
+                                          "binder": {
+                                            "kind": "Binder",
+                                            "loc": null,
+                                            "children": {
+                                              "name": "u"
+                                            }
+                                          }
+                                        }
+                                      },
+                                      {
+                                        "kind": "LexPattern::Alias",
+                                        "loc": null,
+                                        "children": {
+                                          "pat": {
+                                            "kind": "LexPattern::Regex",
+                                            "loc": null,
+                                            "children": {
+                                              "lit": "."
+                                            }
+                                          },
+                                          "binder": {
+                                            "kind": "Binder",
+                                            "loc": null,
+                                            "children": {
+                                              "name": "v"
+                                            }
+                                          }
+                                        }
+                                      }
+                                    ]
+                                  }
+                                }
+                              }
+                            }
+                          }
+                        ]
+                      },
+                      "guard": null,
+                      "body": {
+                        "kind": "Expr::Group",
+                        "loc": null,
+                        "children": {
+                          "expr": {
+                            "kind": "Expr::Sequence",
+                            "loc": null,
+                            "children": {
+                              "exprs": {
+                                "kind": "Expr::Sequence::ExprList",
+                                "loc": null,
+                                "children": [
+                                  {
+                                    "kind": "Expr::Apply",
+                                    "loc": null,
+                                    "children": {
+                                      "func": {
+                                        "kind": "Expr::Ident",
+                                        "loc": null,
+                                        "children": {
+                                          "id": {
+                                            "kind": "Var",
+                                            "loc": null,
+                                            "children": {
+                                              "name": {
+                                                "kind": "LongIdent::Ident",
+                                                "loc": null,
+                                                "children": {
+                                                  "value": "assert_eq"
+                                                }
+                                              }
+                                            }
+                                          }
+                                        }
+                                      },
+                                      "args": {
+                                        "kind": "Expr::Apply::ArgumentList",
+                                        "loc": null,
+                                        "children": [
+                                          {
+                                            "kind": "Argument",
+                                            "loc": null,
+                                            "children": {
+                                              "value": {
+                                                "kind": "Expr::Ident",
+                                                "loc": null,
+                                                "children": {
+                                                  "id": {
+                                                    "kind": "Var",
+                                                    "loc": null,
+                                                    "children": {
+                                                      "name": {
+                                                        "kind": "LongIdent::Ident",
+                                                        "loc": null,
+                                                        "children": {
+                                                          "value": "u"
+                                                        }
+                                                      }
+                                                    }
+                                                  }
+                                                }
+                                              },
+                                              "kind": {
+                                                "kind": "ArgumentKind::Positional",
+                                                "loc": null,
+                                                "children": {}
+                                              }
+                                            }
+                                          },
+                                          {
+                                            "kind": "Argument",
+                                            "loc": null,
+                                            "children": {
+                                              "value": {
+                                                "kind": "Expr::Constant",
+                                                "loc": null,
+                                                "children": {
+                                                  "constant": {
+                                                    "kind": "Constant::Char",
+                                                    "loc": null,
+                                                    "children": {
+                                                      "value": "😋"
+                                                    }
+                                                  }
+                                                }
+                                              },
+                                              "kind": {
+                                                "kind": "ArgumentKind::Positional",
+                                                "loc": null,
+                                                "children": {}
+                                              }
+                                            }
+                                          }
+                                        ]
+                                      },
+                                      "attr": {
+                                        "kind": "ApplyAttr::NoAttr",
+                                        "loc": null,
+                                        "children": {}
+                                      }
+                                    }
+                                  }
+                                ]
+                              },
+                              "last_expr": {
+                                "kind": "Expr::Apply",
+                                "loc": null,
+                                "children": {
+                                  "func": {
+                                    "kind": "Expr::Ident",
+                                    "loc": null,
+                                    "children": {
+                                      "id": {
+                                        "kind": "Var",
+                                        "loc": null,
+                                        "children": {
+                                          "name": {
+                                            "kind": "LongIdent::Ident",
+                                            "loc": null,
+                                            "children": {
+                                              "value": "assert_eq"
+                                            }
+                                          }
+                                        }
+                                      }
+                                    }
+                                  },
+                                  "args": {
+                                    "kind": "Expr::Apply::ArgumentList",
+                                    "loc": null,
+                                    "children": [
+                                      {
+                                        "kind": "Argument",
+                                        "loc": null,
+                                        "children": {
+                                          "value": {
+                                            "kind": "Expr::Ident",
+                                            "loc": null,
+                                            "children": {
+                                              "id": {
+                                                "kind": "Var",
+                                                "loc": null,
+                                                "children": {
+                                                  "name": {
+                                                    "kind": "LongIdent::Ident",
+                                                    "loc": null,
+                                                    "children": {
+                                                      "value": "v"
+                                                    }
+                                                  }
+                                                }
+                                              }
+                                            }
+                                          },
+                                          "kind": {
+                                            "kind": "ArgumentKind::Positional",
+                                            "loc": null,
+                                            "children": {}
+                                          }
+                                        }
+                                      },
+                                      {
+                                        "kind": "Argument",
+                                        "loc": null,
+                                        "children": {
+                                          "value": {
+                                            "kind": "Expr::Constant",
+                                            "loc": null,
+                                            "children": {
+                                              "constant": {
+                                                "kind": "Constant::Char",
+                                                "loc": null,
+                                                "children": {
+                                                  "value": "😋"
+                                                }
+                                              }
+                                            }
+                                          },
+                                          "kind": {
+                                            "kind": "ArgumentKind::Positional",
+                                            "loc": null,
+                                            "children": {}
+                                          }
+                                        }
+                                      }
+                                    ]
+                                  },
+                                  "attr": {
+                                    "kind": "ApplyAttr::NoAttr",
+                                    "loc": null,
+                                    "children": {}
+                                  }
+                                }
+                              }
+                            }
+                          },
+                          "group": {
+                            "kind": "Group::Brace",
+                            "loc": null,
+                            "children": {}
+                          }
+                        }
+                      }
+                    }
+                  },
+                  {
+                    "kind": "LexCase",
+                    "loc": null,
+                    "children": {
+                      "pat": {
+                        "kind": "LexCase::PatternList",
+                        "loc": null,
+                        "children": [
+                          {
+                            "kind": "LexTopPattern::Wildcard",
+                            "loc": null,
+                            "children": {}
+                          }
+                        ]
+                      },
+                      "guard": null,
+                      "body": {
+                        "kind": "Expr::Apply",
+                        "loc": null,
+                        "children": {
+                          "func": {
+                            "kind": "Expr::Ident",
+                            "loc": null,
+                            "children": {
+                              "id": {
+                                "kind": "Var",
+                                "loc": null,
+                                "children": {
+                                  "name": {
+                                    "kind": "LongIdent::Ident",
+                                    "loc": null,
+                                    "children": {
+                                      "value": "fail"
+                                    }
+                                  }
+                                }
+                              }
+                            }
+                          },
+                          "args": {
+                            "kind": "Expr::Apply::ArgumentList",
+                            "loc": null,
+                            "children": [
+                              {
+                                "kind": "Argument",
+                                "loc": null,
+                                "children": {
+                                  "value": {
+                                    "kind": "Expr::Constant",
+                                    "loc": null,
+                                    "children": {
+                                      "constant": {
+                                        "kind": "Constant::String",
+                                        "loc": null,
+                                        "children": {
+                                          "value": "mismatch"
+                                        }
+                                      }
+                                    }
+                                  },
+                                  "kind": {
+                                    "kind": "ArgumentKind::Positional",
+                                    "loc": null,
+                                    "children": {}
+                                  }
+                                }
+                              }
+                            ]
+                          },
+                          "attr": {
+                            "kind": "ApplyAttr::NoAttr",
+                            "loc": null,
+                            "children": {}
+                          }
+                        }
+                      }
+                    }
+                  }
+                ]
+              }
+            }
+          }
+        }
+      }
+    }
+  },
+  {
+    "kind": "Impl::TopFuncDef",
+    "loc": null,
+    "children": {
+      "fun_decl": {
+        "kind": "FunDecl",
+        "loc": null,
+        "children": {
+          "type_name": null,
+          "name": {
+            "kind": "Binder",
+            "loc": null,
+            "children": {
+              "name": "main"
             }
           },
           "has_error": null,
@@ -4864,6 +5325,79 @@
                         "children": {}
                       }
                     }
+                  },
+                  {
+                    "kind": "Expr::Apply",
+                    "loc": null,
+                    "children": {
+                      "func": {
+                        "kind": "Expr::Ident",
+                        "loc": null,
+                        "children": {
+                          "id": {
+                            "kind": "Var",
+                            "loc": null,
+                            "children": {
+                              "name": {
+                                "kind": "LongIdent::Ident",
+                                "loc": null,
+                                "children": {
+                                  "value": "println"
+                                }
+                              }
+                            }
+                          }
+                        }
+                      },
+                      "args": {
+                        "kind": "Expr::Apply::ArgumentList",
+                        "loc": null,
+                        "children": [
+                          {
+                            "kind": "Argument",
+                            "loc": null,
+                            "children": {
+                              "value": {
+                                "kind": "Expr::Interp",
+                                "loc": null,
+                                "children": {
+                                  "elems": {
+                                    "kind": "Expr::Interp::ElemList",
+                                    "loc": null,
+                                    "children": [
+                                      {
+                                        "kind": "InterpElem::Literal",
+                                        "loc": null,
+                                        "children": {
+                                          "repr": "test_simple_assertions: "
+                                        }
+                                      },
+                                      {
+                                        "kind": "InterpElem::Source",
+                                        "loc": null,
+                                        "children": {
+                                          "source": "try? test_simple_assertions()"
+                                        }
+                                      }
+                                    ]
+                                  }
+                                }
+                              },
+                              "kind": {
+                                "kind": "ArgumentKind::Positional",
+                                "loc": null,
+                                "children": {}
+                              }
+                            }
+                          }
+                        ]
+                      },
+                      "attr": {
+                        "kind": "ApplyAttr::NoAttr",
+                        "loc": null,
+                        "children": {}
+                      }
+                    }
                   }
                 ]
               },
@@ -4910,14 +5444,14 @@
                                     "kind": "InterpElem::Literal",
                                     "loc": null,
                                     "children": {
-                                      "repr": "test_simple_assertions: "
+                                      "repr": "testemoji:"
                                     }
                                   },
                                   {
                                     "kind": "InterpElem::Source",
                                     "loc": null,
                                     "children": {
-                                      "source": "try? test_simple_assertions()"
+                                      "source": "try? test_emoji()"
                                     }
                                   }
                                 ]
diff --git a/test/sync_test/__snapshot__/pipeline_test_lexmatch_first.mbt b/test/sync_test/__snapshot__/pipeline_test_lexmatch_first.mbt
index 0173c841..f0753a28 100644
--- a/test/sync_test/__snapshot__/pipeline_test_lexmatch_first.mbt
+++ b/test/sync_test/__snapshot__/pipeline_test_lexmatch_first.mbt
@@ -85,7 +85,17 @@ fn test_simple_assertions() -> Unit raise {
 }
 
 ///|
-fn init {
+fn test_emoji() -> Unit raise {
+  lexmatch "😋😋" {
+    (("." as u) ("." as v)) => {
+      assert_eq(u, '😋')
+      assert_eq(v, '😋')
+    }
+    _ => fail("mismatch")
+  }
+}
+///|
+fn main {
   println("test_firstmatch: \{try? test_firstmatch()}")
   println("test_search: \{try? test_search()}")
   println("test_multicases_firstmatch: \{try? test_multicases_firstmatch()}")
@@ -93,4 +103,6 @@ fn init {
   println("test_quantifier: \{try? test_quantifier()}")
   println("test_non_greedy_quantifier: \{try? test_non_greedy_quantifier()}")
   println("test_simple_assertions: \{try? test_simple_assertions()}")
+  // non bmp lexmatch
+  println("testemoji:\{try? test_emoji()}")  
 }
diff --git a/test/sync_test/__snapshot__/pipeline_test_lexmatch_first.mbt.tokens.json b/test/sync_test/__snapshot__/pipeline_test_lexmatch_first.mbt.tokens.json
index 8c371516..1e6ac411 100644
--- a/test/sync_test/__snapshot__/pipeline_test_lexmatch_first.mbt.tokens.json
+++ b/test/sync_test/__snapshot__/pipeline_test_lexmatch_first.mbt.tokens.json
@@ -2696,259 +2696,620 @@
   {
     "token": [
       "LIDENT",
-      "init"
+      "test_emoji"
     ],
-    "loc": "88:4-88:8"
+    "loc": "88:4-88:14"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "88:14-88:15"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "88:15-88:16"
+  },
+  {
+    "token": "THIN_ARROW",
+    "loc": "88:17-88:19"
+  },
+  {
+    "token": [
+      "UIDENT",
+      "Unit"
+    ],
+    "loc": "88:20-88:24"
+  },
+  {
+    "token": "RAISE",
+    "loc": "88:25-88:30"
   },
   {
     "token": "LBRACE",
-    "loc": "88:9-88:10"
+    "loc": "88:31-88:32"
   },
   {
     "token": "NEWLINE",
-    "loc": "88:10-88:11"
+    "loc": "88:32-88:33"
+  },
+  {
+    "token": "LEXMATCH",
+    "loc": "89:3-89:11"
+  },
+  {
+    "token": [
+      "STRING",
+      "😋😋"
+    ],
+    "loc": "89:12-89:16"
+  },
+  {
+    "token": "LBRACE",
+    "loc": "89:17-89:18"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "89:18-89:19"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "90:5-90:6"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "90:6-90:7"
+  },
+  {
+    "token": [
+      "STRING",
+      "."
+    ],
+    "loc": "90:7-90:10"
+  },
+  {
+    "token": "AS",
+    "loc": "90:11-90:13"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "u"
+    ],
+    "loc": "90:14-90:15"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "90:15-90:16"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "90:17-90:18"
+  },
+  {
+    "token": [
+      "STRING",
+      "."
+    ],
+    "loc": "90:18-90:21"
+  },
+  {
+    "token": "AS",
+    "loc": "90:22-90:24"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "v"
+    ],
+    "loc": "90:25-90:26"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "90:26-90:27"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "90:27-90:28"
+  },
+  {
+    "token": "FAT_ARROW",
+    "loc": "90:29-90:31"
+  },
+  {
+    "token": "LBRACE",
+    "loc": "90:32-90:33"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "90:33-90:34"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "assert_eq"
+    ],
+    "loc": "91:7-91:16"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "91:16-91:17"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "u"
+    ],
+    "loc": "91:17-91:18"
+  },
+  {
+    "token": "COMMA",
+    "loc": "91:18-91:19"
+  },
+  {
+    "token": [
+      "CHAR",
+      "😋"
+    ],
+    "loc": "91:20-91:23"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "91:23-91:24"
+  },
+  {
+    "token": [
+      "SEMI",
+      false
+    ],
+    "loc": "91:24-91:24"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "91:24-91:25"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "assert_eq"
+    ],
+    "loc": "92:7-92:16"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "92:16-92:17"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "v"
+    ],
+    "loc": "92:17-92:18"
+  },
+  {
+    "token": "COMMA",
+    "loc": "92:18-92:19"
+  },
+  {
+    "token": [
+      "CHAR",
+      "😋"
+    ],
+    "loc": "92:20-92:23"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "92:23-92:24"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "92:24-92:25"
+  },
+  {
+    "token": "RBRACE",
+    "loc": "93:5-93:6"
+  },
+  {
+    "token": [
+      "SEMI",
+      false
+    ],
+    "loc": "93:6-93:6"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "93:6-93:7"
+  },
+  {
+    "token": "UNDERSCORE",
+    "loc": "94:5-94:6"
+  },
+  {
+    "token": "FAT_ARROW",
+    "loc": "94:7-94:9"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "fail"
+    ],
+    "loc": "94:10-94:14"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "94:14-94:15"
+  },
+  {
+    "token": [
+      "STRING",
+      "mismatch"
+    ],
+    "loc": "94:15-94:25"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "94:25-94:26"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "94:26-94:27"
+  },
+  {
+    "token": "RBRACE",
+    "loc": "95:3-95:4"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "95:4-95:5"
+  },
+  {
+    "token": "RBRACE",
+    "loc": "96:1-96:2"
+  },
+  {
+    "token": [
+      "SEMI",
+      false
+    ],
+    "loc": "96:2-96:2"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "96:2-96:3"
+  },
+  {
+    "token": [
+      "COMMENT",
+      {
+        "content": "///|",
+        "kind": [
+          "Ownline",
+          {
+            "leading_blank_line": false,
+            "trailing_blank_line": false
+          }
+        ],
+        "consumed_by_docstring": false
+      }
+    ],
+    "loc": "97:1-97:5"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "97:5-97:6"
+  },
+  {
+    "token": "FN",
+    "loc": "98:1-98:3"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "main"
+    ],
+    "loc": "98:4-98:8"
+  },
+  {
+    "token": "LBRACE",
+    "loc": "98:9-98:10"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "98:10-98:11"
   },
   {
     "token": [
       "LIDENT",
       "println"
     ],
-    "loc": "89:3-89:10"
+    "loc": "99:3-99:10"
   },
   {
     "token": "LPAREN",
-    "loc": "89:10-89:11"
+    "loc": "99:10-99:11"
   },
   {
     "token": [
       "INTERP",
       "\"test_firstmatch: \\{try? test_firstmatch()}\""
     ],
-    "loc": "89:11-89:55"
+    "loc": "99:11-99:55"
   },
   {
     "token": "RPAREN",
-    "loc": "89:55-89:56"
+    "loc": "99:55-99:56"
   },
   {
     "token": [
       "SEMI",
       false
     ],
-    "loc": "89:56-89:56"
+    "loc": "99:56-99:56"
   },
   {
     "token": "NEWLINE",
-    "loc": "89:56-89:57"
+    "loc": "99:56-99:57"
   },
   {
     "token": [
       "LIDENT",
       "println"
     ],
-    "loc": "90:3-90:10"
+    "loc": "100:3-100:10"
   },
   {
     "token": "LPAREN",
-    "loc": "90:10-90:11"
+    "loc": "100:10-100:11"
   },
   {
     "token": [
       "INTERP",
       "\"test_search: \\{try? test_search()}\""
     ],
-    "loc": "90:11-90:47"
+    "loc": "100:11-100:47"
   },
   {
     "token": "RPAREN",
-    "loc": "90:47-90:48"
+    "loc": "100:47-100:48"
   },
   {
     "token": [
       "SEMI",
       false
     ],
-    "loc": "90:48-90:48"
+    "loc": "100:48-100:48"
   },
   {
     "token": "NEWLINE",
-    "loc": "90:48-90:49"
+    "loc": "100:48-100:49"
   },
   {
     "token": [
       "LIDENT",
       "println"
     ],
-    "loc": "91:3-91:10"
+    "loc": "101:3-101:10"
   },
   {
     "token": "LPAREN",
-    "loc": "91:10-91:11"
+    "loc": "101:10-101:11"
   },
   {
     "token": [
       "INTERP",
       "\"test_multicases_firstmatch: \\{try? test_multicases_firstmatch()}\""
     ],
-    "loc": "91:11-91:77"
+    "loc": "101:11-101:77"
   },
   {
     "token": "RPAREN",
-    "loc": "91:77-91:78"
+    "loc": "101:77-101:78"
   },
   {
     "token": [
       "SEMI",
       false
     ],
-    "loc": "91:78-91:78"
+    "loc": "101:78-101:78"
   },
   {
     "token": "NEWLINE",
-    "loc": "91:78-91:79"
+    "loc": "101:78-101:79"
   },
   {
     "token": [
       "LIDENT",
       "println"
     ],
-    "loc": "92:3-92:10"
+    "loc": "102:3-102:10"
   },
   {
     "token": "LPAREN",
-    "loc": "92:10-92:11"
+    "loc": "102:10-102:11"
   },
   {
     "token": [
       "INTERP",
       "\"test_nested_captures: \\{try? test_nested_captures()}\""
     ],
-    "loc": "92:11-92:65"
+    "loc": "102:11-102:65"
   },
   {
     "token": "RPAREN",
-    "loc": "92:65-92:66"
+    "loc": "102:65-102:66"
   },
   {
     "token": [
       "SEMI",
       false
     ],
-    "loc": "92:66-92:66"
+    "loc": "102:66-102:66"
   },
   {
     "token": "NEWLINE",
-    "loc": "92:66-92:67"
+    "loc": "102:66-102:67"
   },
   {
     "token": [
       "LIDENT",
       "println"
     ],
-    "loc": "93:3-93:10"
+    "loc": "103:3-103:10"
   },
   {
     "token": "LPAREN",
-    "loc": "93:10-93:11"
+    "loc": "103:10-103:11"
   },
   {
     "token": [
       "INTERP",
       "\"test_quantifier: \\{try? test_quantifier()}\""
     ],
-    "loc": "93:11-93:55"
+    "loc": "103:11-103:55"
   },
   {
     "token": "RPAREN",
-    "loc": "93:55-93:56"
+    "loc": "103:55-103:56"
   },
   {
     "token": [
       "SEMI",
       false
     ],
-    "loc": "93:56-93:56"
+    "loc": "103:56-103:56"
   },
   {
     "token": "NEWLINE",
-    "loc": "93:56-93:57"
+    "loc": "103:56-103:57"
   },
   {
     "token": [
       "LIDENT",
       "println"
     ],
-    "loc": "94:3-94:10"
+    "loc": "104:3-104:10"
   },
   {
     "token": "LPAREN",
-    "loc": "94:10-94:11"
+    "loc": "104:10-104:11"
   },
   {
     "token": [
       "INTERP",
       "\"test_non_greedy_quantifier: \\{try? test_non_greedy_quantifier()}\""
     ],
-    "loc": "94:11-94:77"
+    "loc": "104:11-104:77"
   },
   {
     "token": "RPAREN",
-    "loc": "94:77-94:78"
+    "loc": "104:77-104:78"
   },
   {
     "token": [
       "SEMI",
       false
     ],
-    "loc": "94:78-94:78"
+    "loc": "104:78-104:78"
   },
   {
     "token": "NEWLINE",
-    "loc": "94:78-94:79"
+    "loc": "104:78-104:79"
   },
   {
     "token": [
       "LIDENT",
       "println"
     ],
-    "loc": "95:3-95:10"
+    "loc": "105:3-105:10"
   },
   {
     "token": "LPAREN",
-    "loc": "95:10-95:11"
+    "loc": "105:10-105:11"
   },
   {
     "token": [
       "INTERP",
       "\"test_simple_assertions: \\{try? test_simple_assertions()}\""
     ],
-    "loc": "95:11-95:69"
+    "loc": "105:11-105:69"
   },
   {
     "token": "RPAREN",
-    "loc": "95:69-95:70"
+    "loc": "105:69-105:70"
+  },
+  {
+    "token": [
+      "SEMI",
+      false
+    ],
+    "loc": "105:70-105:70"
   },
   {
     "token": "NEWLINE",
-    "loc": "95:70-95:71"
+    "loc": "105:70-105:71"
+  },
+  {
+    "token": [
+      "COMMENT",
+      {
+        "content": "// non bmp lexmatch",
+        "kind": [
+          "Ownline",
+          {
+            "leading_blank_line": false,
+            "trailing_blank_line": false
+          }
+        ],
+        "consumed_by_docstring": false
+      }
+    ],
+    "loc": "106:3-106:22"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "106:22-106:23"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "println"
+    ],
+    "loc": "107:3-107:10"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "107:10-107:11"
+  },
+  {
+    "token": [
+      "INTERP",
+      "\"testemoji:\\{try? test_emoji()}\""
+    ],
+    "loc": "107:11-107:43"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "107:43-107:44"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "107:46-107:47"
   },
   {
     "token": "RBRACE",
-    "loc": "96:1-96:2"
+    "loc": "108:1-108:2"
   },
   {
     "token": [
       "SEMI",
       false
     ],
-    "loc": "96:2-96:2"
+    "loc": "108:2-108:2"
   },
   {
     "token": "NEWLINE",
-    "loc": "96:2-96:3"
+    "loc": "108:2-108:3"
   },
   {
     "token": "EOF",
-    "loc": "97:1-97:1"
+    "loc": "109:1-109:1"
   }
 ]
\ No newline at end of file
diff --git a/test/sync_test/__snapshot__/pipeline_test_lexmatch_no_regex.json b/test/sync_test/__snapshot__/pipeline_test_lexmatch_no_regex.json
new file mode 100644
index 00000000..020e2d1f
--- /dev/null
+++ b/test/sync_test/__snapshot__/pipeline_test_lexmatch_no_regex.json
@@ -0,0 +1,280 @@
+[
+  {
+    "kind": "Impl::TopFuncDef",
+    "loc": null,
+    "children": {
+      "fun_decl": {
+        "kind": "FunDecl",
+        "loc": null,
+        "children": {
+          "type_name": null,
+          "name": {
+            "kind": "Binder",
+            "loc": null,
+            "children": {
+              "name": "main"
+            }
+          },
+          "has_error": null,
+          "is_async": null,
+          "decl_params": null,
+          "quantifiers": {
+            "kind": "FunDecl::QuantifierList",
+            "loc": null,
+            "children": []
+          },
+          "return_type": null,
+          "error_type": {
+            "kind": "ErrorType::NoErrorType",
+            "loc": null,
+            "children": {}
+          },
+          "vis": {
+            "kind": "Visibility::Default",
+            "loc": null,
+            "children": {}
+          },
+          "attrs": {
+            "kind": "FunDecl::AttrList",
+            "loc": null,
+            "children": []
+          },
+          "doc": ""
+        }
+      },
+      "decl_body": {
+        "kind": "DeclBody::DeclBody",
+        "loc": null,
+        "children": {
+          "local_types": {
+            "kind": "DeclBody::DeclBody::LocalTypeList",
+            "loc": null,
+            "children": []
+          },
+          "expr": {
+            "kind": "Expr::Let",
+            "loc": null,
+            "children": {
+              "pattern": {
+                "kind": "Pattern::Var",
+                "loc": null,
+                "children": {
+                  "value": {
+                    "kind": "Binder",
+                    "loc": null,
+                    "children": {
+                      "name": "h"
+                    }
+                  }
+                }
+              },
+              "expr": {
+                "kind": "Expr::Constant",
+                "loc": null,
+                "children": {
+                  "constant": {
+                    "kind": "Constant::String",
+                    "loc": null,
+                    "children": {
+                      "value": "hello"
+                    }
+                  }
+                }
+              },
+              "body": {
+                "kind": "Expr::Lexmatch",
+                "loc": null,
+                "children": {
+                  "strategy": null,
+                  "expr": {
+                    "kind": "Expr::Ident",
+                    "loc": null,
+                    "children": {
+                      "id": {
+                        "kind": "Var",
+                        "loc": null,
+                        "children": {
+                          "name": {
+                            "kind": "LongIdent::Ident",
+                            "loc": null,
+                            "children": {
+                              "value": "h"
+                            }
+                          }
+                        }
+                      }
+                    }
+                  },
+                  "cases": {
+                    "kind": "Expr::Lexmatch::CaseList",
+                    "loc": null,
+                    "children": [
+                      {
+                        "kind": "LexCase",
+                        "loc": null,
+                        "children": {
+                          "pat": {
+                            "kind": "LexCase::PatternList",
+                            "loc": null,
+                            "children": [
+                              {
+                                "kind": "LexTopPattern::Pattern",
+                                "loc": null,
+                                "children": {
+                                  "value": {
+                                    "kind": "LexPattern::Regex",
+                                    "loc": null,
+                                    "children": {
+                                      "lit": "he"
+                                    }
+                                  }
+                                }
+                              },
+                              {
+                                "kind": "LexTopPattern::Binder",
+                                "loc": null,
+                                "children": {
+                                  "value": {
+                                    "kind": "Binder",
+                                    "loc": null,
+                                    "children": {
+                                      "name": "x"
+                                    }
+                                  }
+                                }
+                              }
+                            ]
+                          },
+                          "guard": null,
+                          "body": {
+                            "kind": "Expr::Apply",
+                            "loc": null,
+                            "children": {
+                              "func": {
+                                "kind": "Expr::Ident",
+                                "loc": null,
+                                "children": {
+                                  "id": {
+                                    "kind": "Var",
+                                    "loc": null,
+                                    "children": {
+                                      "name": {
+                                        "kind": "LongIdent::Ident",
+                                        "loc": null,
+                                        "children": {
+                                          "value": "println"
+                                        }
+                                      }
+                                    }
+                                  }
+                                }
+                              },
+                              "args": {
+                                "kind": "Expr::Apply::ArgumentList",
+                                "loc": null,
+                                "children": [
+                                  {
+                                    "kind": "Argument",
+                                    "loc": null,
+                                    "children": {
+                                      "value": {
+                                        "kind": "Expr::Ident",
+                                        "loc": null,
+                                        "children": {
+                                          "id": {
+                                            "kind": "Var",
+                                            "loc": null,
+                                            "children": {
+                                              "name": {
+                                                "kind": "LongIdent::Ident",
+                                                "loc": null,
+                                                "children": {
+                                                  "value": "x"
+                                                }
+                                              }
+                                            }
+                                          }
+                                        }
+                                      },
+                                      "kind": {
+                                        "kind": "ArgumentKind::Positional",
+                                        "loc": null,
+                                        "children": {}
+                                      }
+                                    }
+                                  }
+                                ]
+                              },
+                              "attr": {
+                                "kind": "ApplyAttr::NoAttr",
+                                "loc": null,
+                                "children": {}
+                              }
+                            }
+                          }
+                        }
+                      },
+                      {
+                        "kind": "LexCase",
+                        "loc": null,
+                        "children": {
+                          "pat": {
+                            "kind": "LexCase::PatternList",
+                            "loc": null,
+                            "children": [
+                              {
+                                "kind": "LexTopPattern::Wildcard",
+                                "loc": null,
+                                "children": {}
+                              }
+                            ]
+                          },
+                          "guard": null,
+                          "body": {
+                            "kind": "Expr::Apply",
+                            "loc": null,
+                            "children": {
+                              "func": {
+                                "kind": "Expr::Ident",
+                                "loc": null,
+                                "children": {
+                                  "id": {
+                                    "kind": "Var",
+                                    "loc": null,
+                                    "children": {
+                                      "name": {
+                                        "kind": "LongIdent::Ident",
+                                        "loc": null,
+                                        "children": {
+                                          "value": "panic"
+                                        }
+                                      }
+                                    }
+                                  }
+                                }
+                              },
+                              "args": {
+                                "kind": "Expr::Apply::ArgumentList",
+                                "loc": null,
+                                "children": []
+                              },
+                              "attr": {
+                                "kind": "ApplyAttr::NoAttr",
+                                "loc": null,
+                                "children": {}
+                              }
+                            }
+                          }
+                        }
+                      }
+                    ]
+                  }
+                }
+              }
+            }
+          }
+        }
+      }
+    }
+  }
+]
\ No newline at end of file
diff --git a/test/sync_test/__snapshot__/pipeline_test_lexmatch_no_regex.mbt b/test/sync_test/__snapshot__/pipeline_test_lexmatch_no_regex.mbt
new file mode 100644
index 00000000..901791e7
--- /dev/null
+++ b/test/sync_test/__snapshot__/pipeline_test_lexmatch_no_regex.mbt
@@ -0,0 +1,7 @@
+fn main {
+  let h = "hello"
+  lexmatch h {
+    ("he", x) => println(x )
+    _ => panic()
+  }
+}
\ No newline at end of file
diff --git a/test/sync_test/__snapshot__/pipeline_test_lexmatch_no_regex.mbt.tokens.json b/test/sync_test/__snapshot__/pipeline_test_lexmatch_no_regex.mbt.tokens.json
new file mode 100644
index 00000000..1dc90a56
--- /dev/null
+++ b/test/sync_test/__snapshot__/pipeline_test_lexmatch_no_regex.mbt.tokens.json
@@ -0,0 +1,179 @@
+[
+  {
+    "token": "FN",
+    "loc": "1:1-1:3"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "main"
+    ],
+    "loc": "1:4-1:8"
+  },
+  {
+    "token": "LBRACE",
+    "loc": "1:9-1:10"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "1:10-1:11"
+  },
+  {
+    "token": "LET",
+    "loc": "2:3-2:6"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "h"
+    ],
+    "loc": "2:7-2:8"
+  },
+  {
+    "token": "EQUAL",
+    "loc": "2:9-2:10"
+  },
+  {
+    "token": [
+      "STRING",
+      "hello"
+    ],
+    "loc": "2:11-2:18"
+  },
+  {
+    "token": [
+      "SEMI",
+      false
+    ],
+    "loc": "2:18-2:18"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "2:18-2:19"
+  },
+  {
+    "token": "LEXMATCH",
+    "loc": "3:3-3:11"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "h"
+    ],
+    "loc": "3:12-3:13"
+  },
+  {
+    "token": "LBRACE",
+    "loc": "3:14-3:15"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "3:15-3:16"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "4:5-4:6"
+  },
+  {
+    "token": [
+      "STRING",
+      "he"
+    ],
+    "loc": "4:6-4:10"
+  },
+  {
+    "token": "COMMA",
+    "loc": "4:10-4:11"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "x"
+    ],
+    "loc": "4:12-4:13"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "4:13-4:14"
+  },
+  {
+    "token": "FAT_ARROW",
+    "loc": "4:15-4:17"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "println"
+    ],
+    "loc": "4:18-4:25"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "4:25-4:26"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "x"
+    ],
+    "loc": "4:26-4:27"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "4:28-4:29"
+  },
+  {
+    "token": [
+      "SEMI",
+      false
+    ],
+    "loc": "4:29-4:29"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "4:29-4:30"
+  },
+  {
+    "token": "UNDERSCORE",
+    "loc": "5:5-5:6"
+  },
+  {
+    "token": "FAT_ARROW",
+    "loc": "5:7-5:9"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "panic"
+    ],
+    "loc": "5:10-5:15"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "5:15-5:16"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "5:16-5:17"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "5:17-5:18"
+  },
+  {
+    "token": "RBRACE",
+    "loc": "6:3-6:4"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "6:4-6:5"
+  },
+  {
+    "token": "RBRACE",
+    "loc": "7:1-7:2"
+  },
+  {
+    "token": "EOF",
+    "loc": "7:2-7:2"
+  }
+]
\ No newline at end of file
diff --git a/test/sync_test/__snapshot__/parse_test_range_pattern.json b/test/sync_test/__snapshot__/pipeline_test_local_tuple_struct.json
similarity index 50%
rename from test/sync_test/__snapshot__/parse_test_range_pattern.json
rename to test/sync_test/__snapshot__/pipeline_test_local_tuple_struct.json
index df398721..95e6eb4a 100644
--- a/test/sync_test/__snapshot__/parse_test_range_pattern.json
+++ b/test/sync_test/__snapshot__/pipeline_test_local_tuple_struct.json
@@ -1,84 +1,4 @@
 [
-  {
-    "kind": "Impl::TopLetDef",
-    "loc": null,
-    "children": {
-      "binder": {
-        "kind": "Binder",
-        "loc": null,
-        "children": {
-          "name": "C1"
-        }
-      },
-      "ty": null,
-      "expr": {
-        "kind": "Expr::Constant",
-        "loc": null,
-        "children": {
-          "constant": {
-            "kind": "Constant::Int",
-            "loc": null,
-            "children": {
-              "value": "0"
-            }
-          }
-        }
-      },
-      "vis": {
-        "kind": "Visibility::Default",
-        "loc": null,
-        "children": {}
-      },
-      "is_constant": true,
-      "is_declare": false,
-      "attrs": {
-        "kind": "Impl::TopLetDef::AttrList",
-        "loc": null,
-        "children": []
-      },
-      "doc": ""
-    }
-  },
-  {
-    "kind": "Impl::TopLetDef",
-    "loc": null,
-    "children": {
-      "binder": {
-        "kind": "Binder",
-        "loc": null,
-        "children": {
-          "name": "C2"
-        }
-      },
-      "ty": null,
-      "expr": {
-        "kind": "Expr::Constant",
-        "loc": null,
-        "children": {
-          "constant": {
-            "kind": "Constant::Int",
-            "loc": null,
-            "children": {
-              "value": "42"
-            }
-          }
-        }
-      },
-      "vis": {
-        "kind": "Visibility::Default",
-        "loc": null,
-        "children": {}
-      },
-      "is_constant": true,
-      "is_declare": false,
-      "attrs": {
-        "kind": "Impl::TopLetDef::AttrList",
-        "loc": null,
-        "children": []
-      },
-      "doc": ""
-    }
-  },
   {
     "kind": "Impl::TopFuncDef",
     "loc": null,
@@ -92,83 +12,18 @@
             "kind": "Binder",
             "loc": null,
             "children": {
-              "name": "i"
+              "name": "init"
             }
           },
           "has_error": null,
           "is_async": null,
-          "decl_params": {
-            "kind": "FunDecl::ParameterList",
-            "loc": null,
-            "children": [
-              {
-                "kind": "Parameter::Positional",
-                "loc": null,
-                "children": {
-                  "binder": {
-                    "kind": "Binder",
-                    "loc": null,
-                    "children": {
-                      "name": "x"
-                    }
-                  },
-                  "ty": {
-                    "kind": "Type::Name",
-                    "loc": null,
-                    "children": {
-                      "constr_id": {
-                        "kind": "ConstrId",
-                        "loc": null,
-                        "children": {
-                          "id": {
-                            "kind": "LongIdent::Ident",
-                            "loc": null,
-                            "children": {
-                              "value": "Int"
-                            }
-                          }
-                        }
-                      },
-                      "tys": {
-                        "kind": "Type::Name::TypeList",
-                        "loc": null,
-                        "children": []
-                      }
-                    }
-                  }
-                }
-              }
-            ]
-          },
+          "decl_params": null,
           "quantifiers": {
             "kind": "FunDecl::QuantifierList",
             "loc": null,
             "children": []
           },
-          "return_type": {
-            "kind": "Type::Name",
-            "loc": null,
-            "children": {
-              "constr_id": {
-                "kind": "ConstrId",
-                "loc": null,
-                "children": {
-                  "id": {
-                    "kind": "LongIdent::Ident",
-                    "loc": null,
-                    "children": {
-                      "value": "Unit"
-                    }
-                  }
-                }
-              },
-              "tys": {
-                "kind": "Type::Name::TypeList",
-                "loc": null,
-                "children": []
-              }
-            }
-          },
+          "return_type": null,
           "error_type": {
             "kind": "ErrorType::NoErrorType",
             "loc": null,
@@ -194,476 +49,363 @@
           "local_types": {
             "kind": "DeclBody::DeclBody::LocalTypeList",
             "loc": null,
-            "children": []
-          },
-          "expr": {
-            "kind": "Expr::Match",
-            "loc": null,
-            "children": {
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-                                "kind": "Constructor",
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-                                  "name": {
-                                    "kind": "ConstrName",
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                                     "children": {
-                                      "name": "C1"
+                                      "value": "Int"
                                     }
-                                  },
-                                  "extra_info": {
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-                                    "loc": null,
-                                    "children": {}
                                   }
                                 }
                               },
-                              "args": null,
-                              "is_open": false
+                              "tys": {
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+                                "loc": null,
+                                "children": []
+                              }
                             }
                           },
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-                              "constr": {
-                                "kind": "Constructor",
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                                 "children": {
-                                  "name": {
-                                    "kind": "ConstrName",
+                                  "id": {
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                                     "children": {
-                                      "name": "C2"
+                                      "value": "String"
                                     }
-                                  },
-                                  "extra_info": {
-                                    "kind": "ConstructorExtraInfo::NoExtraInfo",
-                                    "loc": null,
-                                    "children": {}
                                   }
                                 }
                               },
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-                              "is_open": false
+                              "tys": {
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+                              }
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+                              "name": "S"
                             }
                           },
-                          "kind": {
-                            "kind": "RangeKind::Inclusive",
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+                            "kind": "ConstructorExtraInfo::NoExtraInfo",
                             "loc": null,
                             "children": {}
                           }
                         }
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-                        "children": {
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-                        }
                       }
                     }
                   },
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-                        "kind": "Pattern::Range",
+                    "children": [
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+                        "kind": "Argument",
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                         "children": {
-                          "lhs": {
-                            "kind": "Pattern::Constant",
+                          "value": {
+                            "kind": "Expr::Constant",
                             "loc": null,
                             "children": {
                               "constant": {
                                 "kind": "Constant::Int",
                                 "loc": null,
                                 "children": {
-                                  "value": "100"
+                                  "value": "4"
                                 }
                               }
                             }
                           },
-                          "rhs": {
-                            "kind": "Pattern::Constant",
+                          "kind": {
+                            "kind": "ArgumentKind::Positional",
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+                          }
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                             "loc": null,
                             "children": {
                               "constant": {
-                                "kind": "Constant::Int",
+                                "kind": "Constant::String",
                                 "loc": null,
                                 "children": {
-                                  "value": "200"
+                                  "value": "2"
                                 }
                               }
                             }
                           },
                           "kind": {
-                            "kind": "RangeKind::Exclusive",
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                           }
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-                        "children": {
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-                        }
                       }
-                    }
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                   },
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                         "children": {
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-                            "loc": null,
-                            "children": {}
-                          },
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-                                "loc": null,
-                                "children": {
-                                  "value": "0"
-                                }
-                              }
+                              "name": "S"
                             }
                           },
-                          "kind": {
-                            "kind": "RangeKind::Exclusive",
+                          "extra_info": {
+                            "kind": "ConstructorExtraInfo::NoExtraInfo",
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                             "children": {}
                           }
                         }
                       },
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                         "loc": null,
-                        "children": {
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-                            "kind": "Pattern::Constant",
+                        "children": [
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                             "loc": null,
                             "children": {
-                              "constant": {
-                                "kind": "Constant::Int",
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                                 "loc": null,
                                 "children": {
-                                  "value": "0"
+                                  "value": {
+                                    "kind": "Binder",
+                                    "loc": null,
+                                    "children": {
+                                      "name": "x"
+                                    }
+                                  }
                                 }
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+                                "children": {}
                               }
                             }
                           },
-                          "rhs": {
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-                            "loc": null,
-                            "children": {}
-                          },
-                          "kind": {
-                            "kind": "RangeKind::Exclusive",
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                             "loc": null,
-                            "children": {}
+                            "children": {
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+                                "children": {
+                                  "value": {
+                                    "kind": "Binder",
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+                                    "children": {
+                                      "name": "y"
+                                    }
+                                  }
+                                }
+                              },
+                              "kind": {
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+                                "children": {}
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                           }
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                       },
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                         "children": {
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+                          "name": {
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+                            "children": {
+                              "value": "s"
+                            }
+                          }
                         }
                       }
                     }
                   },
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                     "children": {
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                         "children": {
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                                 "loc": null,
                                 "children": {
-                                  "name": "x"
+                                  "value": "println"
                                 }
                               }
                             }
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+                          }
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+                        "children": [
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                             "loc": null,
                             "children": {
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                                 "loc": null,
                                 "children": {
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-                                    "kind": "ConstrName",
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-                                    "children": {
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-                                    "children": {}
-                                  }
-                                }
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-                                "kind": "Pattern::Constr::ArgList",
-                                "loc": null,
-                                "children": [
-                                  {
-                                    "kind": "ConstrPatArg",
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                                     "loc": null,
-                                    "children": {
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-                                        "kind": "Pattern::Any",
+                                    "children": [
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                                         "loc": null,
-                                        "children": {}
+                                        "children": {
+                                          "source": "x"
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                                       },
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-                                    "children": {
-                                      "constant": {
-                                        "kind": "Constant::String",
+                                      {
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                                         "loc": null,
                                         "children": {
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                                         }
                                       }
-                                    }
-                                  },
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-                                    "children": {}
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                                   }
                                 }
-                              }
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-                            "children": {}
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-                          "func": {
-                            "kind": "Expr::Ident",
-                            "loc": null,
-                            "children": {
-                              "id": {
-                                "kind": "Var",
+                              },
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                                 "loc": null,
-                                "children": {
-                                  "name": {
-                                    "kind": "LongIdent::Ident",
-                                    "loc": null,
-                                    "children": {
-                                      "value": "println"
-                                    }
-                                  }
-                                }
+                                "children": {}
                               }
                             }
-                          },
-                          "args": {
-                            "kind": "Expr::Apply::ArgumentList",
-                            "loc": null,
-                            "children": [
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-                                "kind": "Argument",
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-                                "children": {
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-                                    "kind": "Expr::Constant",
-                                    "loc": null,
-                                    "children": {
-                                      "constant": {
-                                        "kind": "Constant::String",
-                                        "loc": null,
-                                        "children": {
-                                          "value": "inclusive no upper bound"
-                                        }
-                                      }
-                                    }
-                                  },
-                                  "kind": {
-                                    "kind": "ArgumentKind::Positional",
-                                    "loc": null,
-                                    "children": {}
-                                  }
-                                }
-                              }
-                            ]
-                          },
-                          "attr": {
-                            "kind": "ApplyAttr::NoAttr",
-                            "loc": null,
-                            "children": {}
                           }
-                        }
+                        ]
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+                        "kind": "ApplyAttr::NoAttr",
+                        "loc": null,
+                        "children": {}
                       }
                     }
                   }
-                ]
+                }
               }
             }
           }
@@ -684,83 +426,18 @@
             "kind": "Binder",
             "loc": null,
             "children": {
-              "name": "c"
+              "name": "init"
             }
           },
           "has_error": null,
           "is_async": null,
-          "decl_params": {
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-            "loc": null,
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-                "children": {
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-                    "children": {
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-                    "children": {
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-                        "kind": "ConstrId",
-                        "loc": null,
-                        "children": {
-                          "id": {
-                            "kind": "LongIdent::Ident",
-                            "loc": null,
-                            "children": {
-                              "value": "Char"
-                            }
-                          }
-                        }
-                      },
-                      "tys": {
-                        "kind": "Type::Name::TypeList",
-                        "loc": null,
-                        "children": []
-                      }
-                    }
-                  }
-                }
-              }
-            ]
-          },
+          "decl_params": null,
           "quantifiers": {
             "kind": "FunDecl::QuantifierList",
             "loc": null,
             "children": []
           },
-          "return_type": {
-            "kind": "Type::Name",
-            "loc": null,
-            "children": {
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-                "kind": "ConstrId",
-                "loc": null,
-                "children": {
-                  "id": {
-                    "kind": "LongIdent::Ident",
-                    "loc": null,
-                    "children": {
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-                    }
-                  }
-                }
-              },
-              "tys": {
-                "kind": "Type::Name::TypeList",
-                "loc": null,
-                "children": []
-              }
-            }
-          },
+          "return_type": null,
           "error_type": {
             "kind": "ErrorType::NoErrorType",
             "loc": null,
@@ -786,157 +463,376 @@
           "local_types": {
             "kind": "DeclBody::DeclBody::LocalTypeList",
             "loc": null,
-            "children": []
+            "children": [
+              {
+                "kind": "LocalTypeDecl",
+                "loc": null,
+                "children": {
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+                  "components": {
+                    "kind": "TypeDesc::TupleStruct",
+                    "loc": null,
+                    "children": {
+                      "value": {
+                        "kind": "TypeDesc::TupleStruct::TypeList",
+                        "loc": null,
+                        "children": [
+                          {
+                            "kind": "Type::Name",
+                            "loc": null,
+                            "children": {
+                              "constr_id": {
+                                "kind": "ConstrId",
+                                "loc": null,
+                                "children": {
+                                  "id": {
+                                    "kind": "LongIdent::Ident",
+                                    "loc": null,
+                                    "children": {
+                                      "value": "Int"
+                                    }
+                                  }
+                                }
+                              },
+                              "tys": {
+                                "kind": "Type::Name::TypeList",
+                                "loc": null,
+                                "children": []
+                              }
+                            }
+                          },
+                          {
+                            "kind": "Type::Name",
+                            "loc": null,
+                            "children": {
+                              "constr_id": {
+                                "kind": "ConstrId",
+                                "loc": null,
+                                "children": {
+                                  "id": {
+                                    "kind": "LongIdent::Ident",
+                                    "loc": null,
+                                    "children": {
+                                      "value": "String"
+                                    }
+                                  }
+                                }
+                              },
+                              "tys": {
+                                "kind": "Type::Name::TypeList",
+                                "loc": null,
+                                "children": []
+                              }
+                            }
+                          }
+                        ]
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+                    }
+                  },
+                  "deriving": {
+                    "kind": "LocalTypeDecl::DerivingList",
+                    "loc": null,
+                    "children": []
+                  }
+                }
+              }
+            ]
           },
           "expr": {
-            "kind": "Expr::Match",
+            "kind": "Expr::Let",
             "loc": null,
             "children": {
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                 "loc": null,
                 "children": {
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                     "children": {
-                      "name": {
-                        "kind": "LongIdent::Ident",
-                        "loc": null,
-                        "children": {
-                          "value": "c"
-                        }
-                      }
+                      "name": "s"
                     }
                   }
                 }
               },
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                     "children": {
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                         "loc": null,
                         "children": {
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-                            "kind": "Pattern::Constant",
+                          "name": {
+                            "kind": "ConstrName",
+                            "loc": null,
+                            "children": {
+                              "name": "S"
+                            }
+                          },
+                          "extra_info": {
+                            "kind": "ConstructorExtraInfo::NoExtraInfo",
+                            "loc": null,
+                            "children": {}
+                          }
+                        }
+                      }
+                    }
+                  },
+                  "args": {
+                    "kind": "Expr::Apply::ArgumentList",
+                    "loc": null,
+                    "children": [
+                      {
+                        "kind": "Argument",
+                        "loc": null,
+                        "children": {
+                          "value": {
+                            "kind": "Expr::Constant",
                             "loc": null,
                             "children": {
                               "constant": {
-                                "kind": "Constant::Char",
+                                "kind": "Constant::Int",
                                 "loc": null,
                                 "children": {
-                                  "value": "a"
+                                  "value": "4"
                                 }
                               }
                             }
                           },
-                          "rhs": {
-                            "kind": "Pattern::Constant",
+                          "kind": {
+                            "kind": "ArgumentKind::Positional",
+                            "loc": null,
+                            "children": {}
+                          }
+                        }
+                      },
+                      {
+                        "kind": "Argument",
+                        "loc": null,
+                        "children": {
+                          "value": {
+                            "kind": "Expr::Constant",
                             "loc": null,
                             "children": {
                               "constant": {
-                                "kind": "Constant::Char",
+                                "kind": "Constant::String",
                                 "loc": null,
                                 "children": {
-                                  "value": "z"
+                                  "value": "2"
                                 }
                               }
                             }
                           },
                           "kind": {
-                            "kind": "RangeKind::Inclusive",
+                            "kind": "ArgumentKind::Positional",
                             "loc": null,
                             "children": {}
                           }
                         }
-                      },
-                      "guard": null,
-                      "body": {
-                        "kind": "Expr::Unit",
+                      }
+                    ]
+                  },
+                  "attr": {
+                    "kind": "ApplyAttr::NoAttr",
+                    "loc": null,
+                    "children": {}
+                  }
+                }
+              },
+              "body": {
+                "kind": "Expr::Match",
+                "loc": null,
+                "children": {
+                  "expr": {
+                    "kind": "Expr::Ident",
+                    "loc": null,
+                    "children": {
+                      "id": {
+                        "kind": "Var",
                         "loc": null,
                         "children": {
-                          "faked": false
+                          "name": {
+                            "kind": "LongIdent::Ident",
+                            "loc": null,
+                            "children": {
+                              "value": "s"
+                            }
+                          }
                         }
                       }
                     }
                   },
-                  {
-                    "kind": "Case",
+                  "cases": {
+                    "kind": "Expr::Match::CaseList",
                     "loc": null,
-                    "children": {
-                      "pattern": {
-                        "kind": "Pattern::Range",
+                    "children": [
+                      {
+                        "kind": "Case",
                         "loc": null,
                         "children": {
-                          "lhs": {
-                            "kind": "Pattern::Constant",
+                          "pattern": {
+                            "kind": "Pattern::Constr",
                             "loc": null,
                             "children": {
-                              "constant": {
-                                "kind": "Constant::Char",
+                              "constr": {
+                                "kind": "Constructor",
                                 "loc": null,
                                 "children": {
-                                  "value": "A"
+                                  "name": {
+                                    "kind": "ConstrName",
+                                    "loc": null,
+                                    "children": {
+                                      "name": "S"
+                                    }
+                                  },
+                                  "extra_info": {
+                                    "kind": "ConstructorExtraInfo::NoExtraInfo",
+                                    "loc": null,
+                                    "children": {}
+                                  }
                                 }
-                              }
+                              },
+                              "args": {
+                                "kind": "Pattern::Constr::ArgList",
+                                "loc": null,
+                                "children": [
+                                  {
+                                    "kind": "ConstrPatArg",
+                                    "loc": null,
+                                    "children": {
+                                      "pat": {
+                                        "kind": "Pattern::Var",
+                                        "loc": null,
+                                        "children": {
+                                          "value": {
+                                            "kind": "Binder",
+                                            "loc": null,
+                                            "children": {
+                                              "name": "x"
+                                            }
+                                          }
+                                        }
+                                      },
+                                      "kind": {
+                                        "kind": "ArgumentKind::Positional",
+                                        "loc": null,
+                                        "children": {}
+                                      }
+                                    }
+                                  },
+                                  {
+                                    "kind": "ConstrPatArg",
+                                    "loc": null,
+                                    "children": {
+                                      "pat": {
+                                        "kind": "Pattern::Var",
+                                        "loc": null,
+                                        "children": {
+                                          "value": {
+                                            "kind": "Binder",
+                                            "loc": null,
+                                            "children": {
+                                              "name": "y"
+                                            }
+                                          }
+                                        }
+                                      },
+                                      "kind": {
+                                        "kind": "ArgumentKind::Positional",
+                                        "loc": null,
+                                        "children": {}
+                                      }
+                                    }
+                                  }
+                                ]
+                              },
+                              "is_open": false
                             }
                           },
-                          "rhs": {
-                            "kind": "Pattern::Constant",
+                          "guard": null,
+                          "body": {
+                            "kind": "Expr::Apply",
                             "loc": null,
                             "children": {
-                              "constant": {
-                                "kind": "Constant::Char",
+                              "func": {
+                                "kind": "Expr::Ident",
                                 "loc": null,
                                 "children": {
-                                  "value": "Z"
+                                  "id": {
+                                    "kind": "Var",
+                                    "loc": null,
+                                    "children": {
+                                      "name": {
+                                        "kind": "LongIdent::Ident",
+                                        "loc": null,
+                                        "children": {
+                                          "value": "println"
+                                        }
+                                      }
+                                    }
+                                  }
                                 }
+                              },
+                              "args": {
+                                "kind": "Expr::Apply::ArgumentList",
+                                "loc": null,
+                                "children": [
+                                  {
+                                    "kind": "Argument",
+                                    "loc": null,
+                                    "children": {
+                                      "value": {
+                                        "kind": "Expr::Interp",
+                                        "loc": null,
+                                        "children": {
+                                          "elems": {
+                                            "kind": "Expr::Interp::ElemList",
+                                            "loc": null,
+                                            "children": [
+                                              {
+                                                "kind": "InterpElem::Source",
+                                                "loc": null,
+                                                "children": {
+                                                  "source": "x"
+                                                }
+                                              },
+                                              {
+                                                "kind": "InterpElem::Source",
+                                                "loc": null,
+                                                "children": {
+                                                  "source": "y"
+                                                }
+                                              }
+                                            ]
+                                          }
+                                        }
+                                      },
+                                      "kind": {
+                                        "kind": "ArgumentKind::Positional",
+                                        "loc": null,
+                                        "children": {}
+                                      }
+                                    }
+                                  }
+                                ]
+                              },
+                              "attr": {
+                                "kind": "ApplyAttr::NoAttr",
+                                "loc": null,
+                                "children": {}
                               }
                             }
-                          },
-                          "kind": {
-                            "kind": "RangeKind::Inclusive",
-                            "loc": null,
-                            "children": {}
                           }
                         }
-                      },
-                      "guard": null,
-                      "body": {
-                        "kind": "Expr::Unit",
-                        "loc": null,
-                        "children": {
-                          "faked": false
-                        }
                       }
-                    }
-                  },
-                  {
-                    "kind": "Case",
-                    "loc": null,
-                    "children": {
-                      "pattern": {
-                        "kind": "Pattern::Any",
-                        "loc": null,
-                        "children": {}
-                      },
-                      "guard": null,
-                      "body": {
-                        "kind": "Expr::Unit",
-                        "loc": null,
-                        "children": {
-                          "faked": false
-                        }
-                      }
-                    }
+                    ]
                   }
-                ]
+                }
               }
             }
           }
diff --git a/test/sync_test/__snapshot__/pipeline_test_local_tuple_struct.mbt b/test/sync_test/__snapshot__/pipeline_test_local_tuple_struct.mbt
new file mode 100644
index 00000000..e52dc294
--- /dev/null
+++ b/test/sync_test/__snapshot__/pipeline_test_local_tuple_struct.mbt
@@ -0,0 +1,16 @@
+///|
+fn init {
+  struct S(Int, String)
+  let s = S(4, "2")
+  let S(x, y) = s 
+  println("\{x}\{y}")
+}
+
+///|
+fn init {
+  struct S(Int, String)
+  let s = S(4, "2")
+  match s {
+    S(x, y) => println("\{x}\{y}")
+  }
+}
diff --git a/test/sync_test/__snapshot__/pipeline_test_local_tuple_struct.mbt.tokens.json b/test/sync_test/__snapshot__/pipeline_test_local_tuple_struct.mbt.tokens.json
new file mode 100644
index 00000000..b9823e84
--- /dev/null
+++ b/test/sync_test/__snapshot__/pipeline_test_local_tuple_struct.mbt.tokens.json
@@ -0,0 +1,509 @@
+[
+  {
+    "token": [
+      "COMMENT",
+      {
+        "content": "///|",
+        "kind": [
+          "Ownline",
+          {
+            "leading_blank_line": false,
+            "trailing_blank_line": false
+          }
+        ],
+        "consumed_by_docstring": false
+      }
+    ],
+    "loc": "1:1-1:5"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "1:5-1:6"
+  },
+  {
+    "token": "FN",
+    "loc": "2:1-2:3"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "init"
+    ],
+    "loc": "2:4-2:8"
+  },
+  {
+    "token": "LBRACE",
+    "loc": "2:9-2:10"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "2:10-2:11"
+  },
+  {
+    "token": "STRUCT",
+    "loc": "3:3-3:9"
+  },
+  {
+    "token": [
+      "UIDENT",
+      "S"
+    ],
+    "loc": "3:10-3:11"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "3:11-3:12"
+  },
+  {
+    "token": [
+      "UIDENT",
+      "Int"
+    ],
+    "loc": "3:12-3:15"
+  },
+  {
+    "token": "COMMA",
+    "loc": "3:15-3:16"
+  },
+  {
+    "token": [
+      "UIDENT",
+      "String"
+    ],
+    "loc": "3:17-3:23"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "3:23-3:24"
+  },
+  {
+    "token": [
+      "SEMI",
+      false
+    ],
+    "loc": "3:24-3:24"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "3:24-3:25"
+  },
+  {
+    "token": "LET",
+    "loc": "4:3-4:6"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "s"
+    ],
+    "loc": "4:7-4:8"
+  },
+  {
+    "token": "EQUAL",
+    "loc": "4:9-4:10"
+  },
+  {
+    "token": [
+      "UIDENT",
+      "S"
+    ],
+    "loc": "4:11-4:12"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "4:12-4:13"
+  },
+  {
+    "token": [
+      "INT",
+      "4"
+    ],
+    "loc": "4:13-4:14"
+  },
+  {
+    "token": "COMMA",
+    "loc": "4:14-4:15"
+  },
+  {
+    "token": [
+      "STRING",
+      "2"
+    ],
+    "loc": "4:16-4:19"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "4:19-4:20"
+  },
+  {
+    "token": [
+      "SEMI",
+      false
+    ],
+    "loc": "4:20-4:20"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "4:20-4:21"
+  },
+  {
+    "token": "LET",
+    "loc": "5:3-5:6"
+  },
+  {
+    "token": [
+      "UIDENT",
+      "S"
+    ],
+    "loc": "5:7-5:8"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "5:8-5:9"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "x"
+    ],
+    "loc": "5:9-5:10"
+  },
+  {
+    "token": "COMMA",
+    "loc": "5:10-5:11"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "y"
+    ],
+    "loc": "5:12-5:13"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "5:13-5:14"
+  },
+  {
+    "token": "EQUAL",
+    "loc": "5:15-5:16"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "s"
+    ],
+    "loc": "5:17-5:18"
+  },
+  {
+    "token": [
+      "SEMI",
+      false
+    ],
+    "loc": "5:18-5:18"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "5:19-5:20"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "println"
+    ],
+    "loc": "6:3-6:10"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "6:10-6:11"
+  },
+  {
+    "token": [
+      "INTERP",
+      "\"\\{x}\\{y}\""
+    ],
+    "loc": "6:11-6:21"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "6:21-6:22"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "6:22-6:23"
+  },
+  {
+    "token": "RBRACE",
+    "loc": "7:1-7:2"
+  },
+  {
+    "token": [
+      "SEMI",
+      false
+    ],
+    "loc": "7:2-7:2"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "7:2-7:3"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "8:1-8:2"
+  },
+  {
+    "token": [
+      "COMMENT",
+      {
+        "content": "///|",
+        "kind": [
+          "Ownline",
+          {
+            "leading_blank_line": true,
+            "trailing_blank_line": false
+          }
+        ],
+        "consumed_by_docstring": false
+      }
+    ],
+    "loc": "9:1-9:5"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "9:5-9:6"
+  },
+  {
+    "token": "FN",
+    "loc": "10:1-10:3"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "init"
+    ],
+    "loc": "10:4-10:8"
+  },
+  {
+    "token": "LBRACE",
+    "loc": "10:9-10:10"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "10:10-10:11"
+  },
+  {
+    "token": "STRUCT",
+    "loc": "11:3-11:9"
+  },
+  {
+    "token": [
+      "UIDENT",
+      "S"
+    ],
+    "loc": "11:10-11:11"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "11:11-11:12"
+  },
+  {
+    "token": [
+      "UIDENT",
+      "Int"
+    ],
+    "loc": "11:12-11:15"
+  },
+  {
+    "token": "COMMA",
+    "loc": "11:15-11:16"
+  },
+  {
+    "token": [
+      "UIDENT",
+      "String"
+    ],
+    "loc": "11:17-11:23"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "11:23-11:24"
+  },
+  {
+    "token": [
+      "SEMI",
+      false
+    ],
+    "loc": "11:24-11:24"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "11:24-11:25"
+  },
+  {
+    "token": "LET",
+    "loc": "12:3-12:6"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "s"
+    ],
+    "loc": "12:7-12:8"
+  },
+  {
+    "token": "EQUAL",
+    "loc": "12:9-12:10"
+  },
+  {
+    "token": [
+      "UIDENT",
+      "S"
+    ],
+    "loc": "12:11-12:12"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "12:12-12:13"
+  },
+  {
+    "token": [
+      "INT",
+      "4"
+    ],
+    "loc": "12:13-12:14"
+  },
+  {
+    "token": "COMMA",
+    "loc": "12:14-12:15"
+  },
+  {
+    "token": [
+      "STRING",
+      "2"
+    ],
+    "loc": "12:16-12:19"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "12:19-12:20"
+  },
+  {
+    "token": [
+      "SEMI",
+      false
+    ],
+    "loc": "12:20-12:20"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "12:20-12:21"
+  },
+  {
+    "token": "MATCH",
+    "loc": "13:3-13:8"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "s"
+    ],
+    "loc": "13:9-13:10"
+  },
+  {
+    "token": "LBRACE",
+    "loc": "13:11-13:12"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "13:12-13:13"
+  },
+  {
+    "token": [
+      "UIDENT",
+      "S"
+    ],
+    "loc": "14:5-14:6"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "14:6-14:7"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "x"
+    ],
+    "loc": "14:7-14:8"
+  },
+  {
+    "token": "COMMA",
+    "loc": "14:8-14:9"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "y"
+    ],
+    "loc": "14:10-14:11"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "14:11-14:12"
+  },
+  {
+    "token": "FAT_ARROW",
+    "loc": "14:13-14:15"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "println"
+    ],
+    "loc": "14:16-14:23"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "14:23-14:24"
+  },
+  {
+    "token": [
+      "INTERP",
+      "\"\\{x}\\{y}\""
+    ],
+    "loc": "14:24-14:34"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "14:34-14:35"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "14:35-14:36"
+  },
+  {
+    "token": "RBRACE",
+    "loc": "15:3-15:4"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "15:4-15:5"
+  },
+  {
+    "token": "RBRACE",
+    "loc": "16:1-16:2"
+  },
+  {
+    "token": [
+      "SEMI",
+      false
+    ],
+    "loc": "16:2-16:2"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "16:2-16:3"
+  },
+  {
+    "token": "EOF",
+    "loc": "17:1-17:1"
+  }
+]
\ No newline at end of file
diff --git a/test/sync_test/__snapshot__/pipeline_test_loopify_corner_case.json b/test/sync_test/__snapshot__/pipeline_test_loopify_corner_case.json
new file mode 100644
index 00000000..cf93cb74
--- /dev/null
+++ b/test/sync_test/__snapshot__/pipeline_test_loopify_corner_case.json
@@ -0,0 +1,1208 @@
+[
+  {
+    "kind": "Impl::TopTypeDef",
+    "loc": null,
+    "children": {
+      "value": {
+        "kind": "TypeDecl",
+        "loc": null,
+        "children": {
+          "tycon": "S",
+          "params": {
+            "kind": "TypeDecl::ParamList",
+            "loc": null,
+            "children": []
+          },
+          "components": {
+            "kind": "TypeDesc::Record",
+            "loc": null,
+            "children": {
+              "value": {
+                "kind": "TypeDesc::Record::FieldList",
+                "loc": null,
+                "children": [
+                  {
+                    "kind": "FieldDecl",
+                    "loc": null,
+                    "children": {
+                      "name": {
+                        "kind": "FieldName",
+                        "loc": null,
+                        "children": {
+                          "label": "a"
+                        }
+                      },
+                      "ty": {
+                        "kind": "Type::Name",
+                        "loc": null,
+                        "children": {
+                          "constr_id": {
+                            "kind": "ConstrId",
+                            "loc": null,
+                            "children": {
+                              "id": {
+                                "kind": "LongIdent::Ident",
+                                "loc": null,
+                                "children": {
+                                  "value": "Int"
+                                }
+                              }
+                            }
+                          },
+                          "tys": {
+                            "kind": "Type::Name::TypeList",
+                            "loc": null,
+                            "children": []
+                          }
+                        }
+                      },
+                      "mut": false,
+                      "vis": {
+                        "kind": "Visibility::Default",
+                        "loc": null,
+                        "children": {}
+                      },
+                      "attrs": {
+                        "kind": "FieldDecl::AttrList",
+                        "loc": null,
+                        "children": []
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+                                        "loc": null,
+                                        "children": {
+                                          "id": {
+                                            "kind": "Var",
+                                            "loc": null,
+                                            "children": {
+                                              "name": {
+                                                "kind": "LongIdent::Ident",
+                                                "loc": null,
+                                                "children": {
+                                                  "value": "s1"
+                                                }
+                                              }
+                                            }
+                                          }
+                                        }
+                                      },
+                                      "kind": {
+                                        "kind": "ArgumentKind::Positional",
+                                        "loc": null,
+                                        "children": {}
+                                      }
+                                    }
+                                  }
+                                ]
+                              },
+                              "attr": {
+                                "kind": "ApplyAttr::NoAttr",
+                                "loc": null,
+                                "children": {}
+                              }
+                            }
+                          }
+                        }
+                      }
+                    }
+                  },
+                  "return_type": {
+                    "kind": "Type::Name",
+                    "loc": null,
+                    "children": {
+                      "constr_id": {
+                        "kind": "ConstrId",
+                        "loc": null,
+                        "children": {
+                          "id": {
+                            "kind": "LongIdent::Ident",
+                            "loc": null,
+                            "children": {
+                              "value": "Unit"
+                            }
+                          }
+                        }
+                      },
+                      "tys": {
+                        "kind": "Type::Name::TypeList",
+                        "loc": null,
+                        "children": []
+                      }
+                    }
+                  },
+                  "error_type": {
+                    "kind": "ErrorType::NoErrorType",
+                    "loc": null,
+                    "children": {}
+                  },
+                  "kind": {
+                    "kind": "FnKind::Lambda",
+                    "loc": null,
+                    "children": {}
+                  },
+                  "has_error": null,
+                  "is_async": null
+                }
+              },
+              "body": {
+                "kind": "Expr::Sequence",
+                "loc": null,
+                "children": {
+                  "exprs": {
+                    "kind": "Expr::Sequence::ExprList",
+                    "loc": null,
+                    "children": [
+                      {
+                        "kind": "Expr::Apply",
+                        "loc": null,
+                        "children": {
+                          "func": {
+                            "kind": "Expr::Ident",
+                            "loc": null,
+                            "children": {
+                              "id": {
+                                "kind": "Var",
+                                "loc": null,
+                                "children": {
+                                  "name": {
+                                    "kind": "LongIdent::Ident",
+                                    "loc": null,
+                                    "children": {
+                                      "value": "f"
+                                    }
+                                  }
+                                }
+                              }
+                            }
+                          },
+                          "args": {
+                            "kind": "Expr::Apply::ArgumentList",
+                            "loc": null,
+                            "children": [
+                              {
+                                "kind": "Argument",
+                                "loc": null,
+                                "children": {
+                                  "value": {
+                                    "kind": "Expr::Constant",
+                                    "loc": null,
+                                    "children": {
+                                      "constant": {
+                                        "kind": "Constant::Int",
+                                        "loc": null,
+                                        "children": {
+                                          "value": "1"
+                                        }
+                                      }
+                                    }
+                                  },
+                                  "kind": {
+                                    "kind": "ArgumentKind::Positional",
+                                    "loc": null,
+                                    "children": {}
+                                  }
+                                }
+                              }
+                            ]
+                          },
+                          "attr": {
+                            "kind": "ApplyAttr::NoAttr",
+                            "loc": null,
+                            "children": {}
+                          }
+                        }
+                      }
+                    ]
+                  },
+                  "last_expr": {
+                    "kind": "Expr::Apply",
+                    "loc": null,
+                    "children": {
+                      "func": {
+                        "kind": "Expr::Ident",
+                        "loc": null,
+                        "children": {
+                          "id": {
+                            "kind": "Var",
+                            "loc": null,
+                            "children": {
+                              "name": {
+                                "kind": "LongIdent::Ident",
+                                "loc": null,
+                                "children": {
+                                  "value": "f"
+                                }
+                              }
+                            }
+                          }
+                        }
+                      },
+                      "args": {
+                        "kind": "Expr::Apply::ArgumentList",
+                        "loc": null,
+                        "children": [
+                          {
+                            "kind": "Argument",
+                            "loc": null,
+                            "children": {
+                              "value": {
+                                "kind": "Expr::Constant",
+                                "loc": null,
+                                "children": {
+                                  "constant": {
+                                    "kind": "Constant::Int",
+                                    "loc": null,
+                                    "children": {
+                                      "value": "1"
+                                    }
+                                  }
+                                }
+                              },
+                              "kind": {
+                                "kind": "ArgumentKind::Positional",
+                                "loc": null,
+                                "children": {}
+                              }
+                            }
+                          }
+                        ]
+                      },
+                      "attr": {
+                        "kind": "ApplyAttr::NoAttr",
+                        "loc": null,
+                        "children": {}
+                      }
+                    }
+                  }
+                }
+              }
+            }
+          }
+        }
+      }
+    }
+  }
+]
\ No newline at end of file
diff --git a/test/sync_test/__snapshot__/pipeline_test_loopify_corner_case.mbt b/test/sync_test/__snapshot__/pipeline_test_loopify_corner_case.mbt
new file mode 100644
index 00000000..0fecf61f
--- /dev/null
+++ b/test/sync_test/__snapshot__/pipeline_test_loopify_corner_case.mbt
@@ -0,0 +1,21 @@
+///|
+struct S {
+  a : Int
+  b : Int
+  c : Int
+  d : Int
+  e : Int
+  f : Int
+  g : Int
+} derive(Show)
+
+///|
+fn main {
+  fn f(a : Int) -> Unit {
+    let s = { a: 42, b: 42, c: 42, d: 42, e: 42, f: 42, g: 42 }
+    let s1 = { ..(if a > 0 { s } else { return f(1) }), a: 43 }
+    ignore(s1)
+  }
+  f(1)
+  f(1)
+}
diff --git a/test/sync_test/__snapshot__/pipeline_test_loopify_corner_case.mbt.tokens.json b/test/sync_test/__snapshot__/pipeline_test_loopify_corner_case.mbt.tokens.json
new file mode 100644
index 00000000..9bf7bde9
--- /dev/null
+++ b/test/sync_test/__snapshot__/pipeline_test_loopify_corner_case.mbt.tokens.json
@@ -0,0 +1,821 @@
+[
+  {
+    "token": [
+      "COMMENT",
+      {
+        "content": "///|",
+        "kind": [
+          "Ownline",
+          {
+            "leading_blank_line": false,
+            "trailing_blank_line": false
+          }
+        ],
+        "consumed_by_docstring": false
+      }
+    ],
+    "loc": "1:1-1:5"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "1:5-1:6"
+  },
+  {
+    "token": "STRUCT",
+    "loc": "2:1-2:7"
+  },
+  {
+    "token": [
+      "UIDENT",
+      "S"
+    ],
+    "loc": "2:8-2:9"
+  },
+  {
+    "token": "LBRACE",
+    "loc": "2:10-2:11"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "2:11-2:12"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "a"
+    ],
+    "loc": "3:3-3:4"
+  },
+  {
+    "token": "COLON",
+    "loc": "3:5-3:6"
+  },
+  {
+    "token": [
+      "UIDENT",
+      "Int"
+    ],
+    "loc": "3:7-3:10"
+  },
+  {
+    "token": [
+      "SEMI",
+      false
+    ],
+    "loc": "3:10-3:10"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "3:10-3:11"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "b"
+    ],
+    "loc": "4:3-4:4"
+  },
+  {
+    "token": "COLON",
+    "loc": "4:5-4:6"
+  },
+  {
+    "token": [
+      "UIDENT",
+      "Int"
+    ],
+    "loc": "4:7-4:10"
+  },
+  {
+    "token": [
+      "SEMI",
+      false
+    ],
+    "loc": "4:10-4:10"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "4:10-4:11"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "c"
+    ],
+    "loc": "5:3-5:4"
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+  {
+    "token": "COLON",
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+  {
+    "token": [
+      "UIDENT",
+      "Int"
+    ],
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+  {
+    "token": [
+      "SEMI",
+      false
+    ],
+    "loc": "5:10-5:10"
+  },
+  {
+    "token": "NEWLINE",
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+  },
+  {
+    "token": [
+      "LIDENT",
+      "d"
+    ],
+    "loc": "6:3-6:4"
+  },
+  {
+    "token": "COLON",
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+  },
+  {
+    "token": [
+      "UIDENT",
+      "Int"
+    ],
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+  },
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+    "token": [
+      "SEMI",
+      false
+    ],
+    "loc": "6:10-6:10"
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+  },
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+    "token": [
+      "LIDENT",
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+  {
+    "token": [
+      "LIDENT",
+      "f"
+    ],
+    "loc": "8:3-8:4"
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+  {
+    "token": "COLON",
+    "loc": "8:5-8:6"
+  },
+  {
+    "token": [
+      "UIDENT",
+      "Int"
+    ],
+    "loc": "8:7-8:10"
+  },
+  {
+    "token": [
+      "SEMI",
+      false
+    ],
+    "loc": "8:10-8:10"
+  },
+  {
+    "token": "NEWLINE",
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+  },
+  {
+    "token": [
+      "LIDENT",
+      "g"
+    ],
+    "loc": "9:3-9:4"
+  },
+  {
+    "token": "COLON",
+    "loc": "9:5-9:6"
+  },
+  {
+    "token": [
+      "UIDENT",
+      "Int"
+    ],
+    "loc": "9:7-9:10"
+  },
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+    "token": "NEWLINE",
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+  },
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+    "token": "RBRACE",
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+  },
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+  {
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+      "UIDENT",
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+      {
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+        "kind": [
+          "Ownline",
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+            "trailing_blank_line": false
+          }
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+        "consumed_by_docstring": false
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+    ],
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+  {
+    "token": [
+      "LIDENT",
+      "f"
+    ],
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+    "loc": "14:8-14:9"
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+    "token": "COLON",
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+  },
+  {
+    "token": [
+      "UIDENT",
+      "Int"
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+    "loc": "14:12-14:15"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "14:15-14:16"
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+  {
+    "token": "THIN_ARROW",
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+      "LIDENT",
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+    "token": "EQUAL",
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+    "token": [
+      "LIDENT",
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+  },
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+  },
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+      "LIDENT",
+      "ignore"
+    ],
+    "loc": "17:5-17:11"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "17:11-17:12"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "s1"
+    ],
+    "loc": "17:12-17:14"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "17:14-17:15"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "17:15-17:16"
+  },
+  {
+    "token": "RBRACE",
+    "loc": "18:3-18:4"
+  },
+  {
+    "token": [
+      "SEMI",
+      false
+    ],
+    "loc": "18:4-18:4"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "18:4-18:5"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "f"
+    ],
+    "loc": "19:3-19:4"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "19:4-19:5"
+  },
+  {
+    "token": [
+      "INT",
+      "1"
+    ],
+    "loc": "19:5-19:6"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "19:6-19:7"
+  },
+  {
+    "token": [
+      "SEMI",
+      false
+    ],
+    "loc": "19:7-19:7"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "19:7-19:8"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "f"
+    ],
+    "loc": "20:3-20:4"
+  },
+  {
+    "token": "LPAREN",
+    "loc": "20:4-20:5"
+  },
+  {
+    "token": [
+      "INT",
+      "1"
+    ],
+    "loc": "20:5-20:6"
+  },
+  {
+    "token": "RPAREN",
+    "loc": "20:6-20:7"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "20:7-20:8"
+  },
+  {
+    "token": "RBRACE",
+    "loc": "21:1-21:2"
+  },
+  {
+    "token": [
+      "SEMI",
+      false
+    ],
+    "loc": "21:2-21:2"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "21:2-21:3"
+  },
+  {
+    "token": "EOF",
+    "loc": "22:1-22:1"
+  }
+]
\ No newline at end of file
diff --git a/test/sync_test/__snapshot__/pipeline_test_method_on_object.json b/test/sync_test/__snapshot__/pipeline_test_method_on_object.json
index 0f91389a..143afae1 100644
--- a/test/sync_test/__snapshot__/pipeline_test_method_on_object.json
+++ b/test/sync_test/__snapshot__/pipeline_test_method_on_object.json
@@ -1831,7 +1831,7 @@
                   }
                 ]
               },
-              "return_self": true,
+              "return_self": false,
               "attr": {
                 "kind": "ApplyAttr::NoAttr",
                 "loc": null,
@@ -2238,7 +2238,7 @@
                               }
                             ]
                           },
-                          "return_self": true,
+                          "return_self": false,
                           "attr": {
                             "kind": "ApplyAttr::NoAttr",
                             "loc": null,
diff --git a/test/sync_test/__snapshot__/pipeline_test_method_on_object.mbt b/test/sync_test/__snapshot__/pipeline_test_method_on_object.mbt
index 78c37aa5..fc46d86f 100644
--- a/test/sync_test/__snapshot__/pipeline_test_method_on_object.mbt
+++ b/test/sync_test/__snapshot__/pipeline_test_method_on_object.mbt
@@ -27,7 +27,7 @@ impl[X : Loggable, Y : Loggable] Loggable for (X, Y) with log(self, logger) {
   ..write_obj(self.0)
   ..write_string(", ")
   ..write_obj(self.1)
-  ..write_string(")")
+  .write_string(")")
 }
 
 fn init {
@@ -35,7 +35,7 @@ fn init {
   (buf as &Logger)
   ..write_string("=== start logging ===\n")
   ..write_obj_ln(42)
-  ..write_obj_ln((1, (2, (3, 4))))
+  .write_obj_ln((1, (2, (3, 4))))
   &Logger::write_obj_ln(buf, 0)
   &Logger::write_string(buf, "=== end logging ===")
   println(buf.to_string())
diff --git a/test/sync_test/__snapshot__/pipeline_test_method_on_object.mbt.tokens.json b/test/sync_test/__snapshot__/pipeline_test_method_on_object.mbt.tokens.json
index 8652a6d9..67ab4b47 100644
--- a/test/sync_test/__snapshot__/pipeline_test_method_on_object.mbt.tokens.json
+++ b/test/sync_test/__snapshot__/pipeline_test_method_on_object.mbt.tokens.json
@@ -1089,35 +1089,31 @@
     "token": "NEWLINE",
     "loc": "29:22-29:23"
   },
-  {
-    "token": "DOTDOT",
-    "loc": "30:3-30:5"
-  },
   {
     "token": [
-      "LIDENT",
+      "DOT_LIDENT",
       "write_string"
     ],
-    "loc": "30:5-30:17"
+    "loc": "30:4-30:16"
   },
   {
     "token": "LPAREN",
-    "loc": "30:17-30:18"
+    "loc": "30:16-30:17"
   },
   {
     "token": [
       "STRING",
       ")"
     ],
-    "loc": "30:18-30:21"
+    "loc": "30:17-30:20"
   },
   {
     "token": "RPAREN",
-    "loc": "30:21-30:22"
+    "loc": "30:20-30:21"
   },
   {
     "token": "NEWLINE",
-    "loc": "30:22-30:23"
+    "loc": "30:21-30:22"
   },
   {
     "token": "RBRACE",
@@ -1303,71 +1299,71 @@
     "token": "NEWLINE",
     "loc": "37:21-37:22"
   },
-  {
-    "token": "DOTDOT",
-    "loc": "38:3-38:5"
-  },
   {
     "token": [
-      "LIDENT",
+      "DOT_LIDENT",
       "write_obj_ln"
     ],
-    "loc": "38:5-38:17"
+    "loc": "38:4-38:16"
   },
   {
     "token": "LPAREN",
-    "loc": "38:17-38:18"
+    "loc": "38:16-38:17"
   },
   {
     "token": "LPAREN",
-    "loc": "38:18-38:19"
+    "loc": "38:17-38:18"
   },
   {
     "token": [
       "INT",
       "1"
     ],
-    "loc": "38:19-38:20"
+    "loc": "38:18-38:19"
   },
   {
     "token": "COMMA",
-    "loc": "38:20-38:21"
+    "loc": "38:19-38:20"
   },
   {
     "token": "LPAREN",
-    "loc": "38:22-38:23"
+    "loc": "38:21-38:22"
   },
   {
     "token": [
       "INT",
       "2"
     ],
-    "loc": "38:23-38:24"
+    "loc": "38:22-38:23"
   },
   {
     "token": "COMMA",
-    "loc": "38:24-38:25"
+    "loc": "38:23-38:24"
   },
   {
     "token": "LPAREN",
-    "loc": "38:26-38:27"
+    "loc": "38:25-38:26"
   },
   {
     "token": [
       "INT",
       "3"
     ],
-    "loc": "38:27-38:28"
+    "loc": "38:26-38:27"
   },
   {
     "token": "COMMA",
-    "loc": "38:28-38:29"
+    "loc": "38:27-38:28"
   },
   {
     "token": [
       "INT",
       "4"
     ],
+    "loc": "38:29-38:30"
+  },
+  {
+    "token": "RPAREN",
     "loc": "38:30-38:31"
   },
   {
@@ -1382,20 +1378,16 @@
     "token": "RPAREN",
     "loc": "38:33-38:34"
   },
-  {
-    "token": "RPAREN",
-    "loc": "38:34-38:35"
-  },
   {
     "token": [
       "SEMI",
       false
     ],
-    "loc": "38:35-38:35"
+    "loc": "38:34-38:34"
   },
   {
     "token": "NEWLINE",
-    "loc": "38:35-38:36"
+    "loc": "38:34-38:35"
   },
   {
     "token": "AMPER",
diff --git a/test/sync_test/__snapshot__/pipeline_test_method_on_object2.json b/test/sync_test/__snapshot__/pipeline_test_method_on_object2.json
index 943ace4f..dac810b4 100644
--- a/test/sync_test/__snapshot__/pipeline_test_method_on_object2.json
+++ b/test/sync_test/__snapshot__/pipeline_test_method_on_object2.json
@@ -943,7 +943,7 @@
                                 "loc": null,
                                 "children": []
                               },
-                              "return_self": true,
+                              "return_self": false,
                               "attr": {
                                 "kind": "ApplyAttr::NoAttr",
                                 "loc": null,
diff --git a/test/sync_test/__snapshot__/pipeline_test_method_on_object2.mbt b/test/sync_test/__snapshot__/pipeline_test_method_on_object2.mbt
index c668b7e3..9cb283ff 100644
--- a/test/sync_test/__snapshot__/pipeline_test_method_on_object2.mbt
+++ b/test/sync_test/__snapshot__/pipeline_test_method_on_object2.mbt
@@ -19,7 +19,7 @@ fn &Obj::default() -> &Obj {
 fn init {
   println("==== dot syntax ====")
   let obj = &Obj::default()
-  obj..f()..g()
+  obj..f().g()
   println("==== qualified call ====")
   &Obj::f(obj)
   &Obj::g(obj)
diff --git a/test/sync_test/__snapshot__/pipeline_test_method_on_object2.mbt.tokens.json b/test/sync_test/__snapshot__/pipeline_test_method_on_object2.mbt.tokens.json
index 22dc6beb..bc3181a6 100644
--- a/test/sync_test/__snapshot__/pipeline_test_method_on_object2.mbt.tokens.json
+++ b/test/sync_test/__snapshot__/pipeline_test_method_on_object2.mbt.tokens.json
@@ -616,35 +616,31 @@
     "token": "RPAREN",
     "loc": "22:10-22:11"
   },
-  {
-    "token": "DOTDOT",
-    "loc": "22:11-22:13"
-  },
   {
     "token": [
-      "LIDENT",
+      "DOT_LIDENT",
       "g"
     ],
-    "loc": "22:13-22:14"
+    "loc": "22:12-22:13"
   },
   {
     "token": "LPAREN",
-    "loc": "22:14-22:15"
+    "loc": "22:13-22:14"
   },
   {
     "token": "RPAREN",
-    "loc": "22:15-22:16"
+    "loc": "22:14-22:15"
   },
   {
     "token": [
       "SEMI",
       false
     ],
-    "loc": "22:16-22:16"
+    "loc": "22:15-22:15"
   },
   {
     "token": "NEWLINE",
-    "loc": "22:16-22:17"
+    "loc": "22:15-22:16"
   },
   {
     "token": [
diff --git a/test/sync_test/__snapshot__/pipeline_test_non_tail_run_async.json b/test/sync_test/__snapshot__/pipeline_test_non_tail_run_async.json
index e3bbb8b8..a2e38419 100644
--- a/test/sync_test/__snapshot__/pipeline_test_non_tail_run_async.json
+++ b/test/sync_test/__snapshot__/pipeline_test_non_tail_run_async.json
@@ -868,148 +868,159 @@
                                         "children": []
                                       },
                                       "body": {
-                                        "kind": "Expr::Sequence",
+                                        "kind": "Expr::Group",
                                         "loc": null,
                                         "children": {
-                                          "exprs": {
-                                            "kind": "Expr::Sequence::ExprList",
+                                          "expr": {
+                                            "kind": "Expr::Sequence",
                                             "loc": null,
-                                            "children": [
-                                              {
-                                                "kind": "Expr::If",
+                                            "children": {
+                                              "exprs": {
+                                                "kind": "Expr::Sequence::ExprList",
                                                 "loc": null,
-                                                "children": {
-                                                  "cond": {
-                                                    "kind": "Expr::Field",
+                                                "children": [
+                                                  {
+                                                    "kind": "Expr::If",
                                                     "loc": null,
                                                     "children": {
-                                                      "record": {
-                                                        "kind": "Expr::Ident",
+                                                      "cond": {
+                                                        "kind": "Expr::Field",
                                                         "loc": null,
                                                         "children": {
-                                                          "id": {
-                                                            "kind": "Var",
+                                                          "record": {
+                                                            "kind": "Expr::Ident",
+                                                            "loc": null,
+                                                            "children": {
+                                                              "id": {
+                                                                "kind": "Var",
+                                                                "loc": null,
+                                                                "children": {
+                                                                  "name": {
+                                                                    "kind": "LongIdent::Ident",
+                                                                    "loc": null,
+                                                                    "children": {
+                                                                      "value": "flag"
+                                                                    }
+                                                                  }
+                                                                }
+                                                              }
+                                                            }
+                                                          },
+                                                          "accessor": {
+                                                            "kind": "Accessor::Label",
                                                             "loc": null,
                                                             "children": {
-                                                              "name": {
-                                                                "kind": "LongIdent::Ident",
+                                                              "value": {
+                                                                "kind": "Label",
                                                                 "loc": null,
                                                                 "children": {
-                                                                  "value": "flag"
+                                                                  "name": "val"
                                                                 }
                                                               }
                                                             }
                                                           }
                                                         }
                                                       },
-                                                      "accessor": {
-                                                        "kind": "Accessor::Label",
+                                                      "ifso": {
+                                                        "kind": "Expr::Return",
                                                         "loc": null,
                                                         "children": {
-                                                          "value": {
-                                                            "kind": "Label",
-                                                            "loc": null,
-                                                            "children": {
-                                                              "name": "val"
-                                                            }
-                                                          }
+                                                          "return_value": null
                                                         }
-                                                      }
-                                                    }
-                                                  },
-                                                  "ifso": {
-                                                    "kind": "Expr::Return",
-                                                    "loc": null,
-                                                    "children": {
-                                                      "return_value": null
+                                                      },
+                                                      "ifnot": null
                                                     }
-                                                  },
-                                                  "ifnot": null
-                                                }
-                                              }
-                                            ]
-                                          },
-                                          "last_expr": {
-                                            "kind": "Expr::Apply",
-                                            "loc": null,
-                                            "children": {
-                                              "func": {
-                                                "kind": "Expr::Ident",
+                                                  }
+                                                ]
+                                              },
+                                              "last_expr": {
+                                                "kind": "Expr::Apply",
                                                 "loc": null,
                                                 "children": {
-                                                  "id": {
-                                                    "kind": "Var",
+                                                  "func": {
+                                                    "kind": "Expr::Ident",
                                                     "loc": null,
                                                     "children": {
-                                                      "name": {
-                                                        "kind": "LongIdent::Ident",
+                                                      "id": {
+                                                        "kind": "Var",
                                                         "loc": null,
                                                         "children": {
-                                                          "value": "println"
+                                                          "name": {
+                                                            "kind": "LongIdent::Ident",
+                                                            "loc": null,
+                                                            "children": {
+                                                              "value": "println"
+                                                            }
+                                                          }
                                                         }
                                                       }
                                                     }
-                                                  }
-                                                }
-                                              },
-                                              "args": {
-                                                "kind": "Expr::Apply::ArgumentList",
-                                                "loc": null,
-                                                "children": [
-                                                  {
-                                                    "kind": "Argument",
+                                                  },
+                                                  "args": {
+                                                    "kind": "Expr::Apply::ArgumentList",
                                                     "loc": null,
-                                                    "children": {
-                                                      "value": {
-                                                        "kind": "Expr::Apply",
+                                                    "children": [
+                                                      {
+                                                        "kind": "Argument",
                                                         "loc": null,
                                                         "children": {
-                                                          "func": {
-                                                            "kind": "Expr::Ident",
+                                                          "value": {
+                                                            "kind": "Expr::Apply",
                                                             "loc": null,
                                                             "children": {
-                                                              "id": {
-                                                                "kind": "Var",
+                                                              "func": {
+                                                                "kind": "Expr::Ident",
                                                                 "loc": null,
                                                                 "children": {
-                                                                  "name": {
-                                                                    "kind": "LongIdent::Ident",
+                                                                  "id": {
+                                                                    "kind": "Var",
                                                                     "loc": null,
                                                                     "children": {
-                                                                      "value": "answer"
+                                                                      "name": {
+                                                                        "kind": "LongIdent::Ident",
+                                                                        "loc": null,
+                                                                        "children": {
+                                                                          "value": "answer"
+                                                                        }
+                                                                      }
                                                                     }
                                                                   }
                                                                 }
+                                                              },
+                                                              "args": {
+                                                                "kind": "Expr::Apply::ArgumentList",
+                                                                "loc": null,
+                                                                "children": []
+                                                              },
+                                                              "attr": {
+                                                                "kind": "ApplyAttr::NoAttr",
+                                                                "loc": null,
+                                                                "children": {}
                                                               }
                                                             }
                                                           },
-                                                          "args": {
-                                                            "kind": "Expr::Apply::ArgumentList",
-                                                            "loc": null,
-                                                            "children": []
-                                                          },
-                                                          "attr": {
-                                                            "kind": "ApplyAttr::NoAttr",
+                                                          "kind": {
+                                                            "kind": "ArgumentKind::Positional",
                                                             "loc": null,
                                                             "children": {}
                                                           }
                                                         }
-                                                      },
-                                                      "kind": {
-                                                        "kind": "ArgumentKind::Positional",
-                                                        "loc": null,
-                                                        "children": {}
                                                       }
-                                                    }
+                                                    ]
+                                                  },
+                                                  "attr": {
+                                                    "kind": "ApplyAttr::NoAttr",
+                                                    "loc": null,
+                                                    "children": {}
                                                   }
-                                                ]
-                                              },
-                                              "attr": {
-                                                "kind": "ApplyAttr::NoAttr",
-                                                "loc": null,
-                                                "children": {}
+                                                }
                                               }
                                             }
+                                          },
+                                          "group": {
+                                            "kind": "Group::Brace",
+                                            "loc": null,
+                                            "children": {}
                                           }
                                         }
                                       },
@@ -1020,7 +1031,7 @@
                                         "children": {}
                                       },
                                       "kind": {
-                                        "kind": "FnKind::Lambda",
+                                        "kind": "FnKind::Arrow",
                                         "loc": null,
                                         "children": {}
                                       },
diff --git a/test/sync_test/__snapshot__/pipeline_test_non_tail_run_async.mbt b/test/sync_test/__snapshot__/pipeline_test_non_tail_run_async.mbt
index 530d2a72..a296ef18 100644
--- a/test/sync_test/__snapshot__/pipeline_test_non_tail_run_async.mbt
+++ b/test/sync_test/__snapshot__/pipeline_test_non_tail_run_async.mbt
@@ -11,7 +11,7 @@ async fn answer() -> Int noraise {
 let flag : Ref[Bool] = Ref::new(true)
 
 fn main {
-  run_async(fn() {
+  run_async(() => {
     if flag.val {
       // the `return` here should be delimited by `run_async`
       return
diff --git a/test/sync_test/__snapshot__/pipeline_test_non_tail_run_async.mbt.tokens.json b/test/sync_test/__snapshot__/pipeline_test_non_tail_run_async.mbt.tokens.json
index eae539f0..34c449f8 100644
--- a/test/sync_test/__snapshot__/pipeline_test_non_tail_run_async.mbt.tokens.json
+++ b/test/sync_test/__snapshot__/pipeline_test_non_tail_run_async.mbt.tokens.json
@@ -473,25 +473,25 @@
     "token": "LPAREN",
     "loc": "14:12-14:13"
   },
-  {
-    "token": "FN",
-    "loc": "14:13-14:15"
-  },
   {
     "token": "LPAREN",
-    "loc": "14:15-14:16"
+    "loc": "14:13-14:14"
   },
   {
     "token": "RPAREN",
-    "loc": "14:16-14:17"
+    "loc": "14:14-14:15"
+  },
+  {
+    "token": "FAT_ARROW",
+    "loc": "14:16-14:18"
   },
   {
     "token": "LBRACE",
-    "loc": "14:18-14:19"
+    "loc": "14:19-14:20"
   },
   {
     "token": "NEWLINE",
-    "loc": "14:19-14:20"
+    "loc": "14:20-14:21"
   },
   {
     "token": "IF",
diff --git a/test/sync_test/__snapshot__/pipeline_test_noraise.json b/test/sync_test/__snapshot__/pipeline_test_noraise.json
index 740a6c8b..e3ac4308 100644
--- a/test/sync_test/__snapshot__/pipeline_test_noraise.json
+++ b/test/sync_test/__snapshot__/pipeline_test_noraise.json
@@ -500,7 +500,15 @@
           "attrs": {
             "kind": "FunDecl::AttrList",
             "loc": null,
-            "children": []
+            "children": [
+              {
+                "kind": "Attribute",
+                "loc": null,
+                "children": {
+                  "raw": "#warnings(\"-unused_async\") "
+                }
+              }
+            ]
           },
           "doc": ""
         }
diff --git a/test/sync_test/__snapshot__/pipeline_test_noraise.mbt b/test/sync_test/__snapshot__/pipeline_test_noraise.mbt
index f4ef551c..ca0e8361 100644
--- a/test/sync_test/__snapshot__/pipeline_test_noraise.mbt
+++ b/test/sync_test/__snapshot__/pipeline_test_noraise.mbt
@@ -6,6 +6,7 @@ fn ff(a : async () -> Int raise) -> Unit {
 }
 
 ///|
+#warnings("-unused_async") 
 fn main {
   ff(async fn() noraise { 42 })
 }
diff --git a/test/sync_test/__snapshot__/pipeline_test_noraise.mbt.tokens.json b/test/sync_test/__snapshot__/pipeline_test_noraise.mbt.tokens.json
index 8ab751f4..aa23faea 100644
--- a/test/sync_test/__snapshot__/pipeline_test_noraise.mbt.tokens.json
+++ b/test/sync_test/__snapshot__/pipeline_test_noraise.mbt.tokens.json
@@ -295,96 +295,111 @@
     "token": "NEWLINE",
     "loc": "8:5-8:6"
   },
+  {
+    "token": [
+      "ATTRIBUTE",
+      {
+        "id": "warnings",
+        "dot_id": "",
+        "raw_payload": "(\"-unused_async\") "
+      }
+    ],
+    "loc": "9:1-9:28"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "9:28-9:29"
+  },
   {
     "token": "FN",
-    "loc": "9:1-9:3"
+    "loc": "10:1-10:3"
   },
   {
     "token": [
       "LIDENT",
       "main"
     ],
-    "loc": "9:4-9:8"
+    "loc": "10:4-10:8"
   },
   {
     "token": "LBRACE",
-    "loc": "9:9-9:10"
+    "loc": "10:9-10:10"
   },
   {
     "token": "NEWLINE",
-    "loc": "9:10-9:11"
+    "loc": "10:10-10:11"
   },
   {
     "token": [
       "LIDENT",
       "ff"
     ],
-    "loc": "10:3-10:5"
+    "loc": "11:3-11:5"
   },
   {
     "token": "LPAREN",
-    "loc": "10:5-10:6"
+    "loc": "11:5-11:6"
   },
   {
     "token": "ASYNC",
-    "loc": "10:6-10:11"
+    "loc": "11:6-11:11"
   },
   {
     "token": "FN",
-    "loc": "10:12-10:14"
+    "loc": "11:12-11:14"
   },
   {
     "token": "LPAREN",
-    "loc": "10:14-10:15"
+    "loc": "11:14-11:15"
   },
   {
     "token": "RPAREN",
-    "loc": "10:15-10:16"
+    "loc": "11:15-11:16"
   },
   {
     "token": "NORAISE",
-    "loc": "10:17-10:24"
+    "loc": "11:17-11:24"
   },
   {
     "token": "LBRACE",
-    "loc": "10:25-10:26"
+    "loc": "11:25-11:26"
   },
   {
     "token": [
       "INT",
       "42"
     ],
-    "loc": "10:27-10:29"
+    "loc": "11:27-11:29"
   },
   {
     "token": "RBRACE",
-    "loc": "10:30-10:31"
+    "loc": "11:30-11:31"
   },
   {
     "token": "RPAREN",
-    "loc": "10:31-10:32"
+    "loc": "11:31-11:32"
   },
   {
     "token": "NEWLINE",
-    "loc": "10:32-10:33"
+    "loc": "11:32-11:33"
   },
   {
     "token": "RBRACE",
-    "loc": "11:1-11:2"
+    "loc": "12:1-12:2"
   },
   {
     "token": [
       "SEMI",
       false
     ],
-    "loc": "11:2-11:2"
+    "loc": "12:2-12:2"
   },
   {
     "token": "NEWLINE",
-    "loc": "11:2-11:3"
+    "loc": "12:2-12:3"
   },
   {
     "token": "EOF",
-    "loc": "12:1-12:1"
+    "loc": "13:1-13:1"
   }
 ]
\ No newline at end of file
diff --git a/test/sync_test/__snapshot__/pipeline_test_partial_application.mbt b/test/sync_test/__snapshot__/pipeline_test_partial_application.mbt
index 60a63de9..525af4e0 100644
--- a/test/sync_test/__snapshot__/pipeline_test_partial_application.mbt
+++ b/test/sync_test/__snapshot__/pipeline_test_partial_application.mbt
@@ -1,3 +1,5 @@
+//!build: -w -27
+
 ///|
 fn f(a : Int, b : Bool, c : String, d : Double) -> Int {
   println("f(\{a}, \{b}, \{c}, \{d})")
diff --git a/test/sync_test/__snapshot__/pipeline_test_partial_application.mbt.tokens.json b/test/sync_test/__snapshot__/pipeline_test_partial_application.mbt.tokens.json
index 48964c0e..3ff3dc45 100644
--- a/test/sync_test/__snapshot__/pipeline_test_partial_application.mbt.tokens.json
+++ b/test/sync_test/__snapshot__/pipeline_test_partial_application.mbt.tokens.json
@@ -3,207 +3,232 @@
     "token": [
       "COMMENT",
       {
-        "content": "///|",
+        "content": "//!build: -w -27",
         "kind": [
           "Ownline",
           {
             "leading_blank_line": false,
+            "trailing_blank_line": true
+          }
+        ],
+        "consumed_by_docstring": false
+      }
+    ],
+    "loc": "1:1-1:17"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "1:17-1:18"
+  },
+  {
+    "token": "NEWLINE",
+    "loc": "2:1-2:2"
+  },
+  {
+    "token": [
+      "COMMENT",
+      {
+        "content": "///|",
+        "kind": [
+          "Ownline",
+          {
+            "leading_blank_line": true,
             "trailing_blank_line": false
           }
         ],
         "consumed_by_docstring": false
       }
     ],
-    "loc": "1:1-1:5"
+    "loc": "3:1-3:5"
   },
   {
     "token": "NEWLINE",
-    "loc": "1:5-1:6"
+    "loc": "3:5-3:6"
   },
   {
     "token": "FN",
-    "loc": "2:1-2:3"
+    "loc": "4:1-4:3"
   },
   {
     "token": [
       "LIDENT",
       "f"
     ],
-    "loc": "2:4-2:5"
+    "loc": "4:4-4:5"
   },
   {
     "token": "LPAREN",
-    "loc": "2:5-2:6"
+    "loc": "4:5-4:6"
   },
   {
     "token": [
       "LIDENT",
       "a"
     ],
-    "loc": "2:6-2:7"
+    "loc": "4:6-4:7"
   },
   {
     "token": "COLON",
-    "loc": "2:8-2:9"
+    "loc": "4:8-4:9"
   },
   {
     "token": [
       "UIDENT",
       "Int"
     ],
-    "loc": "2:10-2:13"
+    "loc": "4:10-4:13"
   },
   {
     "token": "COMMA",
-    "loc": "2:13-2:14"
+    "loc": "4:13-4:14"
   },
   {
     "token": [
       "LIDENT",
       "b"
     ],
-    "loc": "2:15-2:16"
+    "loc": "4:15-4:16"
   },
   {
     "token": "COLON",
-    "loc": "2:17-2:18"
+    "loc": "4:17-4:18"
   },
   {
     "token": [
       "UIDENT",
       "Bool"
     ],
-    "loc": "2:19-2:23"
+    "loc": "4:19-4:23"
   },
   {
     "token": "COMMA",
-    "loc": "2:23-2:24"
+    "loc": "4:23-4:24"
   },
   {
     "token": [
       "LIDENT",
       "c"
     ],
-    "loc": "2:25-2:26"
+    "loc": "4:25-4:26"
   },
   {
     "token": "COLON",
-    "loc": "2:27-2:28"
+    "loc": "4:27-4:28"
   },
   {
     "token": [
       "UIDENT",
       "String"
     ],
-    "loc": "2:29-2:35"
+    "loc": "4:29-4:35"
   },
   {
     "token": "COMMA",
-    "loc": "2:35-2:36"
+    "loc": "4:35-4:36"
   },
   {
     "token": [
       "LIDENT",
       "d"
     ],
-    "loc": "2:37-2:38"
+    "loc": "4:37-4:38"
   },
   {
     "token": "COLON",
-    "loc": "2:39-2:40"
+    "loc": "4:39-4:40"
   },
   {
     "token": [
       "UIDENT",
       "Double"
     ],
-    "loc": "2:41-2:47"
+    "loc": "4:41-4:47"
   },
   {
     "token": "RPAREN",
-    "loc": "2:47-2:48"
+    "loc": "4:47-4:48"
   },
   {
     "token": "THIN_ARROW",
-    "loc": "2:49-2:51"
+    "loc": "4:49-4:51"
   },
   {
     "token": [
       "UIDENT",
       "Int"
     ],
-    "loc": "2:52-2:55"
+    "loc": "4:52-4:55"
   },
   {
     "token": "LBRACE",
-    "loc": "2:56-2:57"
+    "loc": "4:56-4:57"
   },
   {
     "token": "NEWLINE",
-    "loc": "2:57-2:58"
+    "loc": "4:57-4:58"
   },
   {
     "token": [
       "LIDENT",
       "println"
     ],
-    "loc": "3:3-3:10"
+    "loc": "5:3-5:10"
   },
   {
     "token": "LPAREN",
-    "loc": "3:10-3:11"
+    "loc": "5:10-5:11"
   },
   {
     "token": [
       "INTERP",
       "\"f(\\{a}, \\{b}, \\{c}, \\{d})\""
     ],
-    "loc": "3:11-3:38"
+    "loc": "5:11-5:38"
   },
   {
     "token": "RPAREN",
-    "loc": "3:38-3:39"
+    "loc": "5:38-5:39"
   },
   {
     "token": [
       "SEMI",
       false
     ],
-    "loc": "3:39-3:39"
+    "loc": "5:39-5:39"
   },
   {
     "token": "NEWLINE",
-    "loc": "3:39-3:40"
+    "loc": "5:39-5:40"
   },
   {
     "token": [
       "LIDENT",
       "a"
     ],
-    "loc": "4:3-4:4"
+    "loc": "6:3-6:4"
   },
   {
     "token": "NEWLINE",
-    "loc": "4:4-4:5"
+    "loc": "6:4-6:5"
   },
   {
     "token": "RBRACE",
-    "loc": "5:1-5:2"
+    "loc": "7:1-7:2"
   },
   {
     "token": [
       "SEMI",
       false
     ],
-    "loc": "5:2-5:2"
+    "loc": "7:2-7:2"
   },
   {
     "token": "NEWLINE",
-    "loc": "5:2-5:3"
+    "loc": "7:2-7:3"
   },
   {
     "token": "NEWLINE",
-    "loc": "6:1-6:2"
+    "loc": "8:1-8:2"
   },
   {
     "token": [
@@ -220,264 +245,264 @@
         "consumed_by_docstring": false
       }
     ],
-    "loc": "7:1-7:5"
+    "loc": "9:1-9:5"
   },
   {
     "token": "NEWLINE",
-    "loc": "7:5-7:6"
+    "loc": "9:5-9:6"
   },
   {
     "token": "FN",
-    "loc": "8:1-8:3"
+    "loc": "10:1-10:3"
   },
   {
     "token": [
       "LIDENT",
       "f_err"
     ],
-    "loc": "8:4-8:9"
+    "loc": "10:4-10:9"
   },
   {
     "token": "LPAREN",
-    "loc": "8:9-8:10"
+    "loc": "10:9-10:10"
   },
   {
     "token": [
       "LIDENT",
       "a"
     ],
-    "loc": "8:10-8:11"
+    "loc": "10:10-10:11"
   },
   {
     "token": "COLON",
-    "loc": "8:12-8:13"
+    "loc": "10:12-10:13"
   },
   {
     "token": [
       "UIDENT",
       "Int"
     ],
-    "loc": "8:14-8:17"
+    "loc": "10:14-10:17"
   },
   {
     "token": "COMMA",
-    "loc": "8:17-8:18"
+    "loc": "10:17-10:18"
   },
   {
     "token": [
       "LIDENT",
       "b"
     ],
-    "loc": "8:19-8:20"
+    "loc": "10:19-10:20"
   },
   {
     "token": "COLON",
-    "loc": "8:21-8:22"
+    "loc": "10:21-10:22"
   },
   {
     "token": [
       "UIDENT",
       "Bool"
     ],
-    "loc": "8:23-8:27"
+    "loc": "10:23-10:27"
   },
   {
     "token": "COMMA",
-    "loc": "8:27-8:28"
+    "loc": "10:27-10:28"
   },
   {
     "token": [
       "LIDENT",
       "c"
     ],
-    "loc": "8:29-8:30"
+    "loc": "10:29-10:30"
   },
   {
     "token": "COLON",
-    "loc": "8:31-8:32"
+    "loc": "10:31-10:32"
   },
   {
     "token": [
       "UIDENT",
       "String"
     ],
-    "loc": "8:33-8:39"
+    "loc": "10:33-10:39"
   },
   {
     "token": "COMMA",
-    "loc": "8:39-8:40"
+    "loc": "10:39-10:40"
   },
   {
     "token": [
       "LIDENT",
       "d"
     ],
-    "loc": "8:41-8:42"
+    "loc": "10:41-10:42"
   },
   {
     "token": "COLON",
-    "loc": "8:43-8:44"
+    "loc": "10:43-10:44"
   },
   {
     "token": [
       "UIDENT",
       "Double"
     ],
-    "loc": "8:45-8:51"
+    "loc": "10:45-10:51"
   },
   {
     "token": "RPAREN",
-    "loc": "8:51-8:52"
+    "loc": "10:51-10:52"
   },
   {
     "token": "THIN_ARROW",
-    "loc": "8:53-8:55"
+    "loc": "10:53-10:55"
   },
   {
     "token": [
       "UIDENT",
       "Int"
     ],
-    "loc": "8:56-8:59"
+    "loc": "10:56-10:59"
   },
   {
     "token": "RAISE",
-    "loc": "8:60-8:65"
+    "loc": "10:60-10:65"
   },
   {
     "token": [
       "UIDENT",
       "Error"
     ],
-    "loc": "8:66-8:71"
+    "loc": "10:66-10:71"
   },
   {
     "token": "LBRACE",
-    "loc": "8:72-8:73"
+    "loc": "10:72-10:73"
   },
   {
     "token": "NEWLINE",
-    "loc": "8:73-8:74"
+    "loc": "10:73-10:74"
   },
   {
     "token": [
       "LIDENT",
       "println"
     ],
-    "loc": "9:3-9:10"
+    "loc": "11:3-11:10"
   },
   {
     "token": "LPAREN",
-    "loc": "9:10-9:11"
+    "loc": "11:10-11:11"
   },
   {
     "token": [
       "INTERP",
       "\"f(\\{a}, \\{b}, \\{c}, \\{d})\""
     ],
-    "loc": "9:11-9:38"
+    "loc": "11:11-11:38"
   },
   {
     "token": "RPAREN",
-    "loc": "9:38-9:39"
+    "loc": "11:38-11:39"
   },
   {
     "token": [
       "SEMI",
       false
     ],
-    "loc": "9:39-9:39"
+    "loc": "11:39-11:39"
   },
   {
     "token": "NEWLINE",
-    "loc": "9:39-9:40"
+    "loc": "11:39-11:40"
   },
   {
     "token": "IF",
-    "loc": "10:3-10:5"
+    "loc": "12:3-12:5"
   },
   {
     "token": "FALSE",
-    "loc": "10:6-10:11"
+    "loc": "12:6-12:11"
   },
   {
     "token": "LBRACE",
-    "loc": "10:12-10:13"
+    "loc": "12:12-12:13"
   },
   {
     "token": "NEWLINE",
-    "loc": "10:13-10:14"
+    "loc": "12:13-12:14"
   },
   {
     "token": [
       "LIDENT",
       "fail"
     ],
-    "loc": "11:5-11:9"
+    "loc": "13:5-13:9"
   },
   {
     "token": "LPAREN",
-    "loc": "11:9-11:10"
+    "loc": "13:9-13:10"
   },
   {
     "token": [
       "STRING",
       ""
     ],
-    "loc": "11:10-11:12"
+    "loc": "13:10-13:12"
   },
   {
     "token": "RPAREN",
-    "loc": "11:12-11:13"
+    "loc": "13:12-13:13"
   },
   {
     "token": "NEWLINE",
-    "loc": "11:13-11:14"
+    "loc": "13:13-13:14"
   },
   {
     "token": "RBRACE",
-    "loc": "12:3-12:4"
+    "loc": "14:3-14:4"
   },
   {
     "token": [
       "SEMI",
       false
     ],
-    "loc": "12:4-12:4"
+    "loc": "14:4-14:4"
   },
   {
     "token": "NEWLINE",
-    "loc": "12:4-12:5"
+    "loc": "14:4-14:5"
   },
   {
     "token": [
       "LIDENT",
       "a"
     ],
-    "loc": "13:3-13:4"
+    "loc": "15:3-15:4"
   },
   {
     "token": "NEWLINE",
-    "loc": "13:4-13:5"
+    "loc": "15:4-15:5"
   },
   {
     "token": "RBRACE",
-    "loc": "14:1-14:2"
+    "loc": "16:1-16:2"
   },
   {
     "token": [
       "SEMI",
       false
     ],
-    "loc": "14:2-14:2"
+    "loc": "16:2-16:2"
   },
   {
     "token": "NEWLINE",
-    "loc": "14:2-14:3"
+    "loc": "16:2-16:3"
   },
   {
     "token": "NEWLINE",
-    "loc": "15:1-15:2"
+    "loc": "17:1-17:2"
   },
   {
     "token": [
@@ -494,257 +519,257 @@
         "consumed_by_docstring": false
       }
     ],
-    "loc": "16:1-16:5"
+    "loc": "18:1-18:5"
   },
   {
     "token": "NEWLINE",
-    "loc": "16:5-16:6"
+    "loc": "18:5-18:6"
   },
   {
     "token": "FN",
-    "loc": "17:1-17:3"
+    "loc": "19:1-19:3"
   },
   {
     "token": [
       "LIDENT",
       "f_async"
     ],
-    "loc": "17:4-17:11"
+    "loc": "19:4-19:11"
   },
   {
     "token": "LPAREN",
-    "loc": "17:11-17:12"
+    "loc": "19:11-19:12"
   },
   {
     "token": [
       "LIDENT",
       "a"
     ],
-    "loc": "17:12-17:13"
+    "loc": "19:12-19:13"
   },
   {
     "token": "COLON",
-    "loc": "17:14-17:15"
+    "loc": "19:14-19:15"
   },
   {
     "token": [
       "UIDENT",
       "Int"
     ],
-    "loc": "17:16-17:19"
+    "loc": "19:16-19:19"
   },
   {
     "token": "COMMA",
-    "loc": "17:19-17:20"
+    "loc": "19:19-19:20"
   },
   {
     "token": [
       "LIDENT",
       "b"
     ],
-    "loc": "17:21-17:22"
+    "loc": "19:21-19:22"
   },
   {
     "token": "COLON",
-    "loc": "17:23-17:24"
+    "loc": "19:23-19:24"
   },
   {
     "token": [
       "UIDENT",
       "Bool"
     ],
-    "loc": "17:25-17:29"
+    "loc": "19:25-19:29"
   },
   {
     "token": "COMMA",
-    "loc": "17:29-17:30"
+    "loc": "19:29-19:30"
   },
   {
     "token": [
       "LIDENT",
       "c"
     ],
-    "loc": "17:31-17:32"
+    "loc": "19:31-19:32"
   },
   {
     "token": "COLON",
-    "loc": "17:33-17:34"
+    "loc": "19:33-19:34"
   },
   {
     "token": [
       "UIDENT",
       "String"
     ],
-    "loc": "17:35-17:41"
+    "loc": "19:35-19:41"
   },
   {
     "token": "COMMA",
-    "loc": "17:41-17:42"
+    "loc": "19:41-19:42"
   },
   {
     "token": [
       "LIDENT",
       "d"
     ],
-    "loc": "17:43-17:44"
+    "loc": "19:43-19:44"
   },
   {
     "token": "COLON",
-    "loc": "17:45-17:46"
+    "loc": "19:45-19:46"
   },
   {
     "token": [
       "UIDENT",
       "Double"
     ],
-    "loc": "17:47-17:53"
+    "loc": "19:47-19:53"
   },
   {
     "token": "RPAREN",
-    "loc": "17:53-17:54"
+    "loc": "19:53-19:54"
   },
   {
     "token": "THIN_ARROW",
-    "loc": "17:55-17:57"
+    "loc": "19:55-19:57"
   },
   {
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@@ -761,127 +786,127 @@
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@@ -898,104 +923,104 @@
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@@ -1012,167 +1037,167 @@
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@@ -1189,179 +1214,179 @@
         "consumed_by_docstring": false
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@@ -1378,201 +1403,201 @@
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@@ -3103,123 +3128,123 @@
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@@ -3230,94 +3255,94 @@
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@@ -3334,11 +3359,11 @@
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@@ -3355,89 +3380,89 @@
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@@ -3448,182 +3473,182 @@
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@@ -3634,108 +3659,108 @@
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@@ -3752,399 +3777,399 @@
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   },
   {
     "token": "COMMA",
-    "loc": "102:8-102:9"
+    "loc": "104:8-104:9"
   },
   {
     "token": "TRUE",
-    "loc": "102:10-102:14"
+    "loc": "104:10-104:14"
   },
   {
     "token": "COMMA",
-    "loc": "102:14-102:15"
+    "loc": "104:14-104:15"
   },
   {
     "token": [
       "STRING",
       "s"
     ],
-    "loc": "102:16-102:19"
+    "loc": "104:16-104:19"
   },
   {
     "token": "COMMA",
-    "loc": "102:19-102:20"
+    "loc": "104:19-104:20"
   },
   {
     "token": [
       "DOUBLE",
       "2.0"
     ],
-    "loc": "102:21-102:24"
+    "loc": "104:21-104:24"
   },
   {
     "token": "RPAREN",
-    "loc": "102:24-102:25"
+    "loc": "104:24-104:25"
   },
   {
     "token": "RBRACKET",
-    "loc": "102:26-102:27"
+    "loc": "104:26-104:27"
   },
   {
     "token": [
       "DOT_LIDENT",
       "each"
     ],
-    "loc": "102:28-102:32"
+    "loc": "104:28-104:32"
   },
   {
     "token": "LPAREN",
-    "loc": "102:32-102:33"
+    "loc": "104:32-104:33"
   },
   {
     "token": "UNDERSCORE",
-    "loc": "102:33-102:34"
+    "loc": "104:33-104:34"
   },
   {
     "token": [
       "DOT_LIDENT",
       "g"
     ],
-    "loc": "102:35-102:36"
+    "loc": "104:35-104:36"
   },
   {
     "token": "LPAREN",
-    "loc": "102:36-102:37"
+    "loc": "104:36-104:37"
   },
   {
     "token": "FALSE",
-    "loc": "102:37-102:42"
+    "loc": "104:37-104:42"
   },
   {
     "token": "COMMA",
-    "loc": "102:42-102:43"
+    "loc": "104:42-104:43"
   },
   {
     "token": [
       "STRING",
       "x"
     ],
-    "loc": "102:44-102:47"
+    "loc": "104:44-104:47"
   },
   {
     "token": "RPAREN",
-    "loc": "102:47-102:48"
+    "loc": "104:47-104:48"
   },
   {
     "token": "RPAREN",
-    "loc": "102:48-102:49"
+    "loc": "104:48-104:49"
   },
   {
     "token": [
       "SEMI",
       false
     ],
-    "loc": "102:49-102:49"
+    "loc": "104:49-104:49"
   },
   {
     "token": "NEWLINE",
-    "loc": "102:49-102:50"
+    "loc": "104:49-104:50"
   },
   {
     "token": "NEWLINE",
-    "loc": "103:1-103:2"
+    "loc": "105:1-105:2"
   },
   {
     "token": [
@@ -4597,78 +4622,78 @@
         "consumed_by_docstring": false
       }
     ],
-    "loc": "104:3-104:28"
+    "loc": "106:3-106:28"
   },
   {
     "token": "NEWLINE",
-    "loc": "104:28-104:29"
+    "loc": "106:28-106:29"
   },
   {
     "token": [
       "LIDENT",
       "obj"
     ],
-    "loc": "105:3-105:6"
+    "loc": "107:3-107:6"
   },
   {
     "token": "PIPE",
-    "loc": "105:7-105:9"
+    "loc": "107:7-107:9"
   },
   {
     "token": "UNDERSCORE",
-    "loc": "105:10-105:11"
+    "loc": "107:10-107:11"
   },
   {
     "token": [
       "DOT_LIDENT",
       "g"
     ],
-    "loc": "105:12-105:13"
+    "loc": "107:12-107:13"
   },
   {
     "token": "LPAREN",
-    "loc": "105:13-105:14"
+    "loc": "107:13-107:14"
   },
   {
     "token": "TRUE",
-    "loc": "105:14-105:18"
+    "loc": "107:14-107:18"
   },
   {
     "token": "COMMA",
-    "loc": "105:18-105:19"
+    "loc": "107:18-107:19"
   },
   {
     "token": [
       "STRING",
       "y"
     ],
-    "loc": "105:20-105:23"
+    "loc": "107:20-107:23"
   },
   {
     "token": "RPAREN",
-    "loc": "105:23-105:24"
+    "loc": "107:23-107:24"
   },
   {
     "token": "NEWLINE",
-    "loc": "105:24-105:25"
+    "loc": "107:24-107:25"
   },
   {
     "token": "RBRACE",
-    "loc": "106:1-106:2"
+    "loc": "108:1-108:2"
   },
   {
     "token": [
       "SEMI",
       false
     ],
-    "loc": "106:2-106:2"
+    "loc": "108:2-108:2"
   },
   {
     "token": "NEWLINE",
-    "loc": "106:2-106:3"
+    "loc": "108:2-108:3"
   },
   {
     "token": "EOF",
-    "loc": "107:1-107:1"
+    "loc": "109:1-109:1"
   }
 ]
\ No newline at end of file
diff --git a/test/sync_test/__snapshot__/pipeline_test_trait_obj3.json b/test/sync_test/__snapshot__/pipeline_test_trait_obj3.json
index b4f96af8..a6c48588 100644
--- a/test/sync_test/__snapshot__/pipeline_test_trait_obj3.json
+++ b/test/sync_test/__snapshot__/pipeline_test_trait_obj3.json
@@ -664,7 +664,7 @@
                       }
                     ]
                   },
-                  "return_self": true,
+                  "return_self": false,
                   "attr": {
                     "kind": "ApplyAttr::NoAttr",
                     "loc": null,
diff --git a/test/sync_test/__snapshot__/pipeline_test_trait_obj3.mbt b/test/sync_test/__snapshot__/pipeline_test_trait_obj3.mbt
index 88182352..f83438f4 100644
--- a/test/sync_test/__snapshot__/pipeline_test_trait_obj3.mbt
+++ b/test/sync_test/__snapshot__/pipeline_test_trait_obj3.mbt
@@ -8,5 +8,5 @@ impl Obj for Unit with f(_self, x) {
 
 fn init {
   let obj = () as &Obj
-  obj..f(1)..f(2)..f(3)..f(4)
+  obj..f(1)..f(2)..f(3).f(4)
 }
diff --git a/test/sync_test/__snapshot__/pipeline_test_trait_obj3.mbt.tokens.json b/test/sync_test/__snapshot__/pipeline_test_trait_obj3.mbt.tokens.json
index f44bd353..8c146797 100644
--- a/test/sync_test/__snapshot__/pipeline_test_trait_obj3.mbt.tokens.json
+++ b/test/sync_test/__snapshot__/pipeline_test_trait_obj3.mbt.tokens.json
@@ -350,35 +350,31 @@
     "token": "RPAREN",
     "loc": "11:23-11:24"
   },
-  {
-    "token": "DOTDOT",
-    "loc": "11:24-11:26"
-  },
   {
     "token": [
-      "LIDENT",
+      "DOT_LIDENT",
       "f"
     ],
-    "loc": "11:26-11:27"
+    "loc": "11:25-11:26"
   },
   {
     "token": "LPAREN",
-    "loc": "11:27-11:28"
+    "loc": "11:26-11:27"
   },
   {
     "token": [
       "INT",
       "4"
     ],
-    "loc": "11:28-11:29"
+    "loc": "11:27-11:28"
   },
   {
     "token": "RPAREN",
-    "loc": "11:29-11:30"
+    "loc": "11:28-11:29"
   },
   {
     "token": "NEWLINE",
-    "loc": "11:30-11:31"
+    "loc": "11:29-11:30"
   },
   {
     "token": "RBRACE",
diff --git a/test/sync_test/__snapshot__/parse_test_multiline_string_literals.json b/test/sync_test/__snapshot__/pipeline_test_try_result_type.json
similarity index 57%
rename from test/sync_test/__snapshot__/parse_test_multiline_string_literals.json
rename to test/sync_test/__snapshot__/pipeline_test_try_result_type.json
index d420e294..59544ea9 100644
--- a/test/sync_test/__snapshot__/parse_test_multiline_string_literals.json
+++ b/test/sync_test/__snapshot__/pipeline_test_try_result_type.json
@@ -12,7 +12,7 @@
             "kind": "Binder",
             "loc": null,
             "children": {
-              "name": "hello"
+              "name": "f"
             }
           },
           "has_error": null,
@@ -20,7 +20,45 @@
           "decl_params": {
             "kind": "FunDecl::ParameterList",
             "loc": null,
-            "children": []
+            "children": [
+              {
+                "kind": "Parameter::Positional",
+                "loc": null,
+                "children": {
+                  "binder": {
+                    "kind": "Binder",
+                    "loc": null,
+                    "children": {
+                      "name": "c"
+                    }
+                  },
+                  "ty": {
+                    "kind": "Type::Name",
+                    "loc": null,
+                    "children": {
+                      "constr_id": {
+                        "kind": "ConstrId",
+                        "loc": null,
+                        "children": {
+                          "id": {
+                            "kind": "LongIdent::Ident",
+                            "loc": null,
+                            "children": {
+                              "value": "Bool"
+                            }
+                          }
+                        }
+                      },
+                      "tys": {
+                        "kind": "Type::Name::TypeList",
+                        "loc": null,
+                        "children": []
+                      }
+                    }
+                  }
+                }
+              }
+            ]
           },
           "quantifiers": {
             "kind": "FunDecl::QuantifierList",
@@ -39,7 +77,7 @@
                     "kind": "LongIdent::Ident",
                     "loc": null,
                     "children": {
-                      "value": "String"
+                      "value": "Int64"
                     }
                   }
                 }
@@ -52,7 +90,7 @@
             }
           },
           "error_type": {
-            "kind": "ErrorType::NoErrorType",
+            "kind": "ErrorType::DefaultErrorType",
             "loc": null,
             "children": {}
           },
@@ -79,100 +117,105 @@
             "children": []
           },
           "expr": {
-            "kind": "Expr::MultilineString",
+            "kind": "Expr::If",
             "loc": null,
             "children": {
-              "elems": {
-                "kind": "Expr::MultilineString::ElemList",
+              "cond": {
+                "kind": "Expr::Ident",
                 "loc": null,
-                "children": [
-                  {
-                    "kind": "MultilineString::String",
-                    "loc": null,
-                    "children": {
-                      "value": " Hello,"
-                    }
-                  },
-                  {
-                    "kind": "MultilineString::String",
-                    "loc": null,
-                    "children": {
-                      "value": " World."
-                    }
-                  },
-                  {
-                    "kind": "MultilineString::String",
+                "children": {
+                  "id": {
+                    "kind": "Var",
                     "loc": null,
                     "children": {
-                      "value": ""
+                      "name": {
+                        "kind": "LongIdent::Ident",
+                        "loc": null,
+                        "children": {
+                          "value": "c"
+                        }
+                      }
                     }
                   }
-                ]
-              }
-            }
-          }
-        }
-      }
-    }
-  },
-  {
-    "kind": "Impl::TopLetDef",
-    "loc": null,
-    "children": {
-      "binder": {
-        "kind": "Binder",
-        "loc": null,
-        "children": {
-          "name": "str"
-        }
-      },
-      "ty": null,
-      "expr": {
-        "kind": "Expr::MultilineString",
-        "loc": null,
-        "children": {
-          "elems": {
-            "kind": "Expr::MultilineString::ElemList",
-            "loc": null,
-            "children": [
-              {
-                "kind": "MultilineString::String",
-                "loc": null,
-                "children": {
-                  "value": " Hello,"
                 }
               },
-              {
-                "kind": "MultilineString::String",
+              "ifso": {
+                "kind": "Expr::Constant",
                 "loc": null,
                 "children": {
-                  "value": " World."
+                  "constant": {
+                    "kind": "Constant::Int64",
+                    "loc": null,
+                    "children": {
+                      "value": "0"
+                    }
+                  }
                 }
               },
-              {
-                "kind": "MultilineString::String",
+              "ifnot": {
+                "kind": "Expr::Apply",
                 "loc": null,
                 "children": {
-                  "value": ""
+                  "func": {
+                    "kind": "Expr::Ident",
+                    "loc": null,
+                    "children": {
+                      "id": {
+                        "kind": "Var",
+                        "loc": null,
+                        "children": {
+                          "name": {
+                            "kind": "LongIdent::Ident",
+                            "loc": null,
+                            "children": {
+                              "value": "fail"
+                            }
+                          }
+                        }
+                      }
+                    }
+                  },
+                  "args": {
+                    "kind": "Expr::Apply::ArgumentList",
+                    "loc": null,
+                    "children": [
+                      {
+                        "kind": "Argument",
+                        "loc": null,
+                        "children": {
+                          "value": {
+                            "kind": "Expr::Constant",
+                            "loc": null,
+                            "children": {
+                              "constant": {
+                                "kind": "Constant::String",
+                                "loc": null,
+                                "children": {
+                                  "value": "1"
+                                }
+                              }
+                            }
+                          },
+                          "kind": {
+                            "kind": "ArgumentKind::Positional",
+                            "loc": null,
+                            "children": {}
+                          }
+                        }
+                      }
+                    ]
+                  },
+                  "attr": {
+                    "kind": "ApplyAttr::NoAttr",
+                    "loc": null,
+                    "children": {}
+                  }
                 }
               }
-            ]
+            }
           }
         }
-      },
-      "vis": {
-        "kind": "Visibility::Default",
-        "loc": null,
-        "children": {}
-      },
-      "is_constant": false,
-      "is_declare": false,
-      "attrs": {
-        "kind": "Impl::TopLetDef::AttrList",
-        "loc": null,
-        "children": []
-      },
-      "doc": ""
+      }
     }
   },
   {
@@ -188,20 +231,85 @@
             "kind": "Binder",
             "loc": null,
             "children": {
-              "name": "init"
+              "name": "g"
             }
           },
           "has_error": null,
           "is_async": null,
-          "decl_params": null,
+          "decl_params": {
+            "kind": "FunDecl::ParameterList",
+            "loc": null,
+            "children": [
+              {
+                "kind": "Parameter::Positional",
+                "loc": null,
+                "children": {
+                  "binder": {
+                    "kind": "Binder",
+                    "loc": null,
+                    "children": {
+                      "name": "c"
+                    }
+                  },
+                  "ty": {
+                    "kind": "Type::Name",
+                    "loc": null,
+                    "children": {
+                      "constr_id": {
+                        "kind": "ConstrId",
+                        "loc": null,
+                        "children": {
+                          "id": {
+                            "kind": "LongIdent::Ident",
+                            "loc": null,
+                            "children": {
+                              "value": "Bool"
+                            }
+                          }
+                        }
+                      },
+                      "tys": {
+                        "kind": "Type::Name::TypeList",
+                        "loc": null,
+                        "children": []
+                      }
+                    }
+                  }
+                }
+              }
+            ]
+          },
           "quantifiers": {
             "kind": "FunDecl::QuantifierList",
             "loc": null,
             "children": []
           },
-          "return_type": null,
+          "return_type": {
+            "kind": "Type::Name",
+            "loc": null,
+            "children": {
+              "constr_id": {
+                "kind": "ConstrId",
+                "loc": null,
+                "children": {
+                  "id": {
+                    "kind": "LongIdent::Ident",
+                    "loc": null,
+                    "children": {
+                      "value": "Unit"
+                    }
+                  }
+                }
+              },
+              "tys": {
+                "kind": "Type::Name::TypeList",
+                "loc": null,
+                "children": []
+              }
+            }
+          },
           "error_type": {
-            "kind": "ErrorType::NoErrorType",
+            "kind": "ErrorType::DefaultErrorType",
             "loc": null,
             "children": {}
           },
@@ -228,130 +336,127 @@
             "children": []
           },
           "expr": {
-            "kind": "Expr::Let",
+            "kind": "Expr::Try",
             "loc": null,
             "children": {
-              "pattern": {
-                "kind": "Pattern::Var",
-                "loc": null,
-                "children": {
-                  "value": {
-                    "kind": "Binder",
-                    "loc": null,
-                    "children": {
-                      "name": "s"
-                    }
-                  }
-                }
-              },
-              "expr": {
-                "kind": "Expr::MultilineString",
-                "loc": null,
-                "children": {
-                  "elems": {
-                    "kind": "Expr::MultilineString::ElemList",
-                    "loc": null,
-                    "children": [
-                      {
-                        "kind": "MultilineString::String",
-                        "loc": null,
-                        "children": {
-                          "value": " Hello,"
-                        }
-                      },
-                      {
-                        "kind": "MultilineString::String",
-                        "loc": null,
-                        "children": {
-                          "value": " World."
-                        }
-                      },
-                      {
-                        "kind": "MultilineString::String",
-                        "loc": null,
-                        "children": {
-                          "value": ""
-                        }
-                      }
-                    ]
-                  }
-                }
-              },
               "body": {
-                "kind": "Expr::Sequence",
+                "kind": "Expr::Group",
                 "loc": null,
                 "children": {
-                  "exprs": {
-                    "kind": "Expr::Sequence::ExprList",
+                  "expr": {
+                    "kind": "Expr::Apply",
                     "loc": null,
-                    "children": [
-                      {
-                        "kind": "Expr::Apply",
+                    "children": {
+                      "func": {
+                        "kind": "Expr::Ident",
                         "loc": null,
                         "children": {
-                          "func": {
-                            "kind": "Expr::Ident",
+                          "id": {
+                            "kind": "Var",
                             "loc": null,
                             "children": {
-                              "id": {
-                                "kind": "Var",
+                              "name": {
+                                "kind": "LongIdent::Ident",
                                 "loc": null,
                                 "children": {
-                                  "name": {
-                                    "kind": "LongIdent::Ident",
-                                    "loc": null,
-                                    "children": {
-                                      "value": "println"
-                                    }
-                                  }
+                                  "value": "f"
                                 }
                               }
                             }
-                          },
-                          "args": {
-                            "kind": "Expr::Apply::ArgumentList",
-                            "loc": null,
-                            "children": [
-                              {
-                                "kind": "Argument",
+                          }
+                        }
+                      },
+                      "args": {
+                        "kind": "Expr::Apply::ArgumentList",
+                        "loc": null,
+                        "children": [
+                          {
+                            "kind": "Argument",
+                            "loc": null,
+                            "children": {
+                              "value": {
+                                "kind": "Expr::Ident",
                                 "loc": null,
                                 "children": {
-                                  "value": {
-                                    "kind": "Expr::Ident",
+                                  "id": {
+                                    "kind": "Var",
                                     "loc": null,
                                     "children": {
-                                      "id": {
-                                        "kind": "Var",
+                                      "name": {
+                                        "kind": "LongIdent::Ident",
                                         "loc": null,
                                         "children": {
-                                          "name": {
-                                            "kind": "LongIdent::Ident",
-                                            "loc": null,
-                                            "children": {
-                                              "value": "s"
-                                            }
-                                          }
+                                          "value": "c"
                                         }
                                       }
                                     }
-                                  },
-                                  "kind": {
-                                    "kind": "ArgumentKind::Positional",
-                                    "loc": null,
-                                    "children": {}
                                   }
                                 }
+                              },
+                              "kind": {
+                                "kind": "ArgumentKind::Positional",
+                                "loc": null,
+                                "children": {}
                               }
-                            ]
-                          },
-                          "attr": {
-                            "kind": "ApplyAttr::NoAttr",
-                            "loc": null,
-                            "children": {}
+                            }
                           }
+                        ]
+                      },
+                      "attr": {
+                        "kind": "ApplyAttr::NoAttr",
+                        "loc": null,
+                        "children": {}
+                      }
+                    }
+                  },
+                  "group": {
+                    "kind": "Group::Brace",
+                    "loc": null,
+                    "children": {}
+                  }
+                }
+              },
+              "catch": {
+                "kind": "Expr::Try::CaseList",
+                "loc": null,
+                "children": [
+                  {
+                    "kind": "Case",
+                    "loc": null,
+                    "children": {
+                      "pattern": {
+                        "kind": "Pattern::Any",
+                        "loc": null,
+                        "children": {}
+                      },
+                      "guard": null,
+                      "body": {
+                        "kind": "Expr::Unit",
+                        "loc": null,
+                        "children": {
+                          "faked": false
                         }
+                      }
+                    }
+                  }
+                ]
+              },
+              "catch_all": false,
+              "try_else": {
+                "kind": "Expr::Try::CaseList",
+                "loc": null,
+                "children": [
+                  {
+                    "kind": "Case",
+                    "loc": null,
+                    "children": {
+                      "pattern": {
+                        "kind": "Pattern::Any",
+                        "loc": null,
+                        "children": {}
                       },
-                      {
+                      "guard": null,
+                      "body": {
                         "kind": "Expr::Apply",
                         "loc": null,
                         "children": {
@@ -367,7 +472,7 @@
                                     "kind": "LongIdent::Ident",
                                     "loc": null,
                                     "children": {
-                                      "value": "println"
+                                      "value": "fail"
                                     }
                                   }
                                 }
@@ -383,20 +488,14 @@
                                 "loc": null,
                                 "children": {
                                   "value": {
-                                    "kind": "Expr::Ident",
+                                    "kind": "Expr::Constant",
                                     "loc": null,
                                     "children": {
-                                      "id": {
-                                        "kind": "Var",
+                                      "constant": {
+                                        "kind": "Constant::String",
                                         "loc": null,
                                         "children": {
-                                          "name": {
-                                            "kind": "LongIdent::Ident",
-                                            "loc": null,
-                                            "children": {
-                                              "value": "str"
-                                            }
-                                          }
+                                          "value": "!"
                                         }
                                       }
                                     }
@@ -417,9 +516,78 @@
                           }
                         }
                       }
-                    ]
-                  },
-                  "last_expr": {
+                    }
+                  }
+                ]
+              },
+              "has_try": true
+            }
+          }
+        }
+      }
+    }
+  },
+  {
+    "kind": "Impl::TopFuncDef",
+    "loc": null,
+    "children": {
+      "fun_decl": {
+        "kind": "FunDecl",
+        "loc": null,
+        "children": {
+          "type_name": null,
+          "name": {
+            "kind": "Binder",
+            "loc": null,
+            "children": {
+              "name": "init"
+            }
+          },
+          "has_error": null,
+          "is_async": null,
+          "decl_params": null,
+          "quantifiers": {
+            "kind": "FunDecl::QuantifierList",
+            "loc": null,
+            "children": []
+          },
+          "return_type": null,
+          "error_type": {
+            "kind": "ErrorType::NoErrorType",
+            "loc": null,
+            "children": {}
+          },
+          "vis": {
+            "kind": "Visibility::Default",
+            "loc": null,
+            "children": {}
+          },
+          "attrs": {
+            "kind": "FunDecl::AttrList",
+            "loc": null,
+            "children": []
+          },
+          "doc": ""
+        }
+      },
+      "decl_body": {
+        "kind": "DeclBody::DeclBody",
+        "loc": null,
+        "children": {
+          "local_types": {
+            "kind": "DeclBody::DeclBody::LocalTypeList",
+            "loc": null,
+            "children": []
+          },
+          "expr": {
+            "kind": "Expr::Sequence",
+            "loc": null,
+            "children": {
+              "exprs": {
+                "kind": "Expr::Sequence::ExprList",
+                "loc": null,
+                "children": [
+                  {
                     "kind": "Expr::Apply",
                     "loc": null,
                     "children": {
@@ -451,35 +619,71 @@
                             "loc": null,
                             "children": {
                               "value": {
-                                "kind": "Expr::Apply",
+                                "kind": "Expr::TryOperator",
                                 "loc": null,
                                 "children": {
-                                  "func": {
-                                    "kind": "Expr::Ident",
+                                  "body": {
+                                    "kind": "Expr::Apply",
                                     "loc": null,
                                     "children": {
-                                      "id": {
-                                        "kind": "Var",
+                                      "func": {
+                                        "kind": "Expr::Ident",
                                         "loc": null,
                                         "children": {
-                                          "name": {
-                                            "kind": "LongIdent::Ident",
+                                          "id": {
+                                            "kind": "Var",
                                             "loc": null,
                                             "children": {
-                                              "value": "hello"
+                                              "name": {
+                                                "kind": "LongIdent::Ident",
+                                                "loc": null,
+                                                "children": {
+                                                  "value": "g"
+                                                }
+                                              }
                                             }
                                           }
                                         }
+                                      },
+                                      "args": {
+                                        "kind": "Expr::Apply::ArgumentList",
+                                        "loc": null,
+                                        "children": [
+                                          {
+                                            "kind": "Argument",
+                                            "loc": null,
+                                            "children": {
+                                              "value": {
+                                                "kind": "Expr::Constant",
+                                                "loc": null,
+                                                "children": {
+                                                  "constant": {
+                                                    "kind": "Constant::Bool",
+                                                    "loc": null,
+                                                    "children": {
+                                                      "value": true
+                                                    }
+                                                  }
+                                                }
+                                              },
+                                              "kind": {
+                                                "kind": "ArgumentKind::Positional",
+                                                "loc": null,
+                                                "children": {}
+                                              }
+                                            }
+                                          }
+                                        ]
+                                      },
+                                      "attr": {
+                                        "kind": "ApplyAttr::NoAttr",
+                                        "loc": null,
+                                        "children": {}
                                       }
                                     }
                                   },
-                                  "args": {
-                                    "kind": "Expr::Apply::ArgumentList",
-                                    "loc": null,
-                                    "children": []
-                                  },
-                                  "attr": {
-                                    "kind": "ApplyAttr::NoAttr",
+                                  "kind": {
+                                    "kind": "TryOperatorKind::Question",
                                     "loc": null,
                                     "children": {}
                                   }
@@ -501,532 +705,125 @@
                       }
                     }
                   }
-                }
-              }
-            }
-          }
-        }
-      }
-    }
-  },
-  {
-    "kind": "Impl::TopFuncDef",
-    "loc": null,
-    "children": {
-      "fun_decl": {
-        "kind": "FunDecl",
-        "loc": null,
-        "children": {
-          "type_name": null,
-          "name": {
-            "kind": "Binder",
-            "loc": null,
-            "children": {
-              "name": "multiline_string_with_interp1"
-            }
-          },
-          "has_error": null,
-          "is_async": null,
-          "decl_params": {
-            "kind": "FunDecl::ParameterList",
-            "loc": null,
-            "children": [
-              {
-                "kind": "Parameter::Positional",
+                ]
+              },
+              "last_expr": {
+                "kind": "Expr::Apply",
                 "loc": null,
                 "children": {
-                  "binder": {
-                    "kind": "Binder",
-                    "loc": null,
-                    "children": {
-                      "name": "x"
-                    }
-                  },
-                  "ty": {
-                    "kind": "Type::Name",
+                  "func": {
+                    "kind": "Expr::Ident",
                     "loc": null,
                     "children": {
-                      "constr_id": {
-                        "kind": "ConstrId",
+                      "id": {
+                        "kind": "Var",
                         "loc": null,
                         "children": {
-                          "id": {
+                          "name": {
                             "kind": "LongIdent::Ident",
                             "loc": null,
                             "children": {
-                              "value": "Int"
+                              "value": "println"
                             }
                           }
                         }
-                      },
-                      "tys": {
-                        "kind": "Type::Name::TypeList",
-                        "loc": null,
-                        "children": []
                       }
                     }
-                  }
-                }
-              },
-              {
-                "kind": "Parameter::Positional",
-                "loc": null,
-                "children": {
-                  "binder": {
-                    "kind": "Binder",
-                    "loc": null,
-                    "children": {
-                      "name": "y"
-                    }
                   },
-                  "ty": {
-                    "kind": "Type::Name",
+                  "args": {
+                    "kind": "Expr::Apply::ArgumentList",
                     "loc": null,
-                    "children": {
-                      "constr_id": {
-                        "kind": "ConstrId",
+                    "children": [
+                      {
+                        "kind": "Argument",
                         "loc": null,
                         "children": {
-                          "id": {
-                            "kind": "LongIdent::Ident",
+                          "value": {
+                            "kind": "Expr::TryOperator",
                             "loc": null,
                             "children": {
-                              "value": "Bool"
-                            }
-                          }
-                        }
-                      },
-                      "tys": {
-                        "kind": "Type::Name::TypeList",
-                        "loc": null,
-                        "children": []
-                      }
-                    }
-                  }
-                }
-              }
-            ]
-          },
-          "quantifiers": {
-            "kind": "FunDecl::QuantifierList",
-            "loc": null,
-            "children": []
-          },
-          "return_type": {
-            "kind": "Type::Name",
-            "loc": null,
-            "children": {
-              "constr_id": {
-                "kind": "ConstrId",
-                "loc": null,
-                "children": {
-                  "id": {
-                    "kind": "LongIdent::Ident",
-                    "loc": null,
-                    "children": {
-                      "value": "String"
-                    }
-                  }
-                }
-              },
-              "tys": {
-                "kind": "Type::Name::TypeList",
-                "loc": null,
-                "children": []
-              }
-            }
-          },
-          "error_type": {
-            "kind": "ErrorType::NoErrorType",
-            "loc": null,
-            "children": {}
-          },
-          "vis": {
-            "kind": "Visibility::Default",
-            "loc": null,
-            "children": {}
-          },
-          "attrs": {
-            "kind": "FunDecl::AttrList",
-            "loc": null,
-            "children": []
-          },
-          "doc": ""
-        }
-      },
-      "decl_body": {
-        "kind": "DeclBody::DeclBody",
-        "loc": null,
-        "children": {
-          "local_types": {
-            "kind": "DeclBody::DeclBody::LocalTypeList",
-            "loc": null,
-            "children": []
-          },
-          "expr": {
-            "kind": "Expr::Group",
-            "loc": null,
-            "children": {
-              "expr": {
-                "kind": "Expr::MultilineString",
-                "loc": null,
-                "children": {
-                  "elems": {
-                    "kind": "Expr::MultilineString::ElemList",
-                    "loc": null,
-                    "children": [
-                      {
-                        "kind": "MultilineString::Interp",
-                        "loc": null,
-                        "children": {
-                          "value": {
-                            "kind": "MultilineString::Interp::ElemList",
-                            "loc": null,
-                            "children": [
-                              {
-                                "kind": "InterpElem::Literal",
+                              "body": {
+                                "kind": "Expr::Apply",
                                 "loc": null,
                                 "children": {
-                                  "repr": " Hello, "
+                                  "func": {
+                                    "kind": "Expr::Ident",
+                                    "loc": null,
+                                    "children": {
+                                      "id": {
+                                        "kind": "Var",
+                                        "loc": null,
+                                        "children": {
+                                          "name": {
+                                            "kind": "LongIdent::Ident",
+                                            "loc": null,
+                                            "children": {
+                                              "value": "g"
+                                            }
+                                          }
+                                        }
+                                      }
+                                    }
+                                  },
+                                  "args": {
+                                    "kind": "Expr::Apply::ArgumentList",
+                                    "loc": null,
+                                    "children": [
+                                      {
+                                        "kind": "Argument",
+                                        "loc": null,
+                                        "children": {
+                                          "value": {
+                                            "kind": "Expr::Constant",
+                                            "loc": null,
+                                            "children": {
+                                              "constant": {
+                                                "kind": "Constant::Bool",
+                                                "loc": null,
+                                                "children": {
+                                                  "value": false
+                                                }
+                                              }
+                                            }
+                                          },
+                                          "kind": {
+                                            "kind": "ArgumentKind::Positional",
+                                            "loc": null,
+                                            "children": {}
+                                          }
+                                        }
+                                      }
+                                    ]
+                                  },
+                                  "attr": {
+                                    "kind": "ApplyAttr::NoAttr",
+                                    "loc": null,
+                                    "children": {}
+                                  }
                                 }
                               },
-                              {
-                                "kind": "InterpElem::Source",
+                              "kind": {
+                                "kind": "TryOperatorKind::Question",
                                 "loc": null,
-                                "children": {
-                                  "source": "y"
-                                }
+                                "children": {}
                               }
-                            ]
-                          }
-                        }
-                      },
-                      {
-                        "kind": "MultilineString::String",
-                        "loc": null,
-                        "children": {
-                          "value": " String 1"
-                        }
-                      },
-                      {
-                        "kind": "MultilineString::String",
-                        "loc": null,
-                        "children": {
-                          "value": " String 2"
-                        }
-                      },
-                      {
-                        "kind": "MultilineString::Interp",
-                        "loc": null,
-                        "children": {
-                          "value": {
-                            "kind": "MultilineString::Interp::ElemList",
+                            }
+                          },
+                          "kind": {
+                            "kind": "ArgumentKind::Positional",
                             "loc": null,
-                            "children": [
-                              {
-                                "kind": "InterpElem::Literal",
-                                "loc": null,
-                                "children": {
-                                  "repr": " \\t Goodbye, "
-                                }
-                              },
-                              {
-                                "kind": "InterpElem::Source",
-                                "loc": null,
-                                "children": {
-                                  "source": "f(x + 5)"
-                                }
-                              }
-                            ]
+                            "children": {}
                           }
                         }
-                      },
-                      {
-                        "kind": "MultilineString::String",
-                        "loc": null,
-                        "children": {
-                          "value": " String 3"
-                        }
                       }
                     ]
-                  }
-                }
-              },
-              "group": {
-                "kind": "Group::Paren",
-                "loc": null,
-                "children": {}
-              }
-            }
-          }
-        }
-      }
-    }
-  },
-  {
-    "kind": "Impl::TopFuncDef",
-    "loc": null,
-    "children": {
-      "fun_decl": {
-        "kind": "FunDecl",
-        "loc": null,
-        "children": {
-          "type_name": null,
-          "name": {
-            "kind": "Binder",
-            "loc": null,
-            "children": {
-              "name": "multiline_string_with_interp2"
-            }
-          },
-          "has_error": null,
-          "is_async": null,
-          "decl_params": {
-            "kind": "FunDecl::ParameterList",
-            "loc": null,
-            "children": [
-              {
-                "kind": "Parameter::Positional",
-                "loc": null,
-                "children": {
-                  "binder": {
-                    "kind": "Binder",
-                    "loc": null,
-                    "children": {
-                      "name": "x"
-                    }
                   },
-                  "ty": {
-                    "kind": "Type::Name",
+                  "attr": {
+                    "kind": "ApplyAttr::NoAttr",
                     "loc": null,
-                    "children": {
-                      "constr_id": {
-                        "kind": "ConstrId",
-                        "loc": null,
-                        "children": {
-                          "id": {
-                            "kind": "LongIdent::Ident",
-                            "loc": null,
-                            "children": {
-                              "value": "Int"
-                            }
-                          }
-                        }
-                      },
-                      "tys": {
-                        "kind": "Type::Name::TypeList",
-                        "loc": null,
-                        "children": []
-                      }
-                    }
+                    "children": {}
                   }
                 }
-              },
-              {
-                "kind": "Parameter::Positional",
-                "loc": null,
-                "children": {
-                  "binder": {
-                    "kind": "Binder",
-                    "loc": null,
-                    "children": {
-                      "name": "y"
-                    }
-                  },
-                  "ty": {
-                    "kind": "Type::Name",
-                    "loc": null,
-                    "children": {
-                      "constr_id": {
-                        "kind": "ConstrId",
-                        "loc": null,
-                        "children": {
-                          "id": {
-                            "kind": "LongIdent::Ident",
-                            "loc": null,
-                            "children": {
-                              "value": "Bool"
-                            }
-                          }
-                        }
-                      },
-                      "tys": {
-                        "kind": "Type::Name::TypeList",
-                        "loc": null,
-                        "children": []
-                      }
-                    }
-                  }
-                }
-              }
-            ]
-          },
-          "quantifiers": {
-            "kind": "FunDecl::QuantifierList",
-            "loc": null,
-            "children": []
-          },
-          "return_type": {
-            "kind": "Type::Name",
-            "loc": null,
-            "children": {
-              "constr_id": {
-                "kind": "ConstrId",
-                "loc": null,
-                "children": {
-                  "id": {
-                    "kind": "LongIdent::Ident",
-                    "loc": null,
-                    "children": {
-                      "value": "String"
-                    }
-                  }
-                }
-              },
-              "tys": {
-                "kind": "Type::Name::TypeList",
-                "loc": null,
-                "children": []
-              }
-            }
-          },
-          "error_type": {
-            "kind": "ErrorType::NoErrorType",
-            "loc": null,
-            "children": {}
-          },
-          "vis": {
-            "kind": "Visibility::Default",
-            "loc": null,
-            "children": {}
-          },
-          "attrs": {
-            "kind": "FunDecl::AttrList",
-            "loc": null,
-            "children": []
-          },
-          "doc": ""
-        }
-      },
-      "decl_body": {
-        "kind": "DeclBody::DeclBody",
-        "loc": null,
-        "children": {
-          "local_types": {
-            "kind": "DeclBody::DeclBody::LocalTypeList",
-            "loc": null,
-            "children": []
-          },
-          "expr": {
-            "kind": "Expr::Group",
-            "loc": null,
-            "children": {
-              "expr": {
-                "kind": "Expr::MultilineString",
-                "loc": null,
-                "children": {
-                  "elems": {
-                    "kind": "Expr::MultilineString::ElemList",
-                    "loc": null,
-                    "children": [
-                      {
-                        "kind": "MultilineString::Interp",
-                        "loc": null,
-                        "children": {
-                          "value": {
-                            "kind": "MultilineString::Interp::ElemList",
-                            "loc": null,
-                            "children": [
-                              {
-                                "kind": "InterpElem::Literal",
-                                "loc": null,
-                                "children": {
-                                  "repr": " no interpolation"
-                                }
-                              }
-                            ]
-                          }
-                        }
-                      },
-                      {
-                        "kind": "MultilineString::Interp",
-                        "loc": null,
-                        "children": {
-                          "value": {
-                            "kind": "MultilineString::Interp::ElemList",
-                            "loc": null,
-                            "children": [
-                              {
-                                "kind": "InterpElem::Literal",
-                                "loc": null,
-                                "children": {
-                                  "repr": " Hello, "
-                                }
-                              },
-                              {
-                                "kind": "InterpElem::Source",
-                                "loc": null,
-                                "children": {
-                                  "source": "y"
-                                }
-                              }
-                            ]
-                          }
-                        }
-                      },
-                      {
-                        "kind": "MultilineString::Interp",
-                        "loc": null,
-                        "children": {
-                          "value": {
-                            "kind": "MultilineString::Interp::ElemList",
-                            "loc": null,
-                            "children": [
-                              {
-                                "kind": "InterpElem::Literal",
-                                "loc": null,
-                                "children": {
-                                  "repr": " \\t Goodbye, "
-                                }
-                              },
-                              {
-                                "kind": "InterpElem::Source",
-                                "loc": null,
-                                "children": {
-                                  "source": "f(x + 5)"
-                                }
-                              }
-                            ]
-                          }
-                        }
-                      },
-                      {
-                        "kind": "MultilineString::Interp",
-                        "loc": null,
-                        "children": {
-                          "value": {
-                            "kind": "MultilineString::Interp::ElemList",
-                            "loc": null,
-                            "children": [
-                              {
-                                "kind": "InterpElem::Literal",
-                                "loc": null,
-                                "children": {
-                                  "repr": ""
-                                }
-                              }
-                            ]
-                          }
-                        }
-                      }
-                    ]
-                  }
-                }
-              },
-              "group": {
-                "kind": "Group::Paren",
-                "loc": null,
-                "children": {}
               }
             }
           }
diff --git a/test/sync_test/__snapshot__/pipeline_test_try_result_type.mbt b/test/sync_test/__snapshot__/pipeline_test_try_result_type.mbt
index 975744d5..851399b2 100644
--- a/test/sync_test/__snapshot__/pipeline_test_try_result_type.mbt
+++ b/test/sync_test/__snapshot__/pipeline_test_try_result_type.mbt
@@ -11,7 +11,7 @@ fn g(c : Bool) -> Unit raise {
     f(c)
   } catch {
     _ => ()
-  } else {
+  } noraise {
     _ => fail("!")
   }
 }
diff --git a/test/sync_test/__snapshot__/pipeline_test_try_result_type.mbt.tokens.json b/test/sync_test/__snapshot__/pipeline_test_try_result_type.mbt.tokens.json
index 40a7b778..62ace129 100644
--- a/test/sync_test/__snapshot__/pipeline_test_try_result_type.mbt.tokens.json
+++ b/test/sync_test/__snapshot__/pipeline_test_try_result_type.mbt.tokens.json
@@ -297,16 +297,16 @@
     "loc": "14:3-14:4"
   },
   {
-    "token": "ELSE",
-    "loc": "14:5-14:9"
+    "token": "NORAISE",
+    "loc": "14:5-14:12"
   },
   {
     "token": "LBRACE",
-    "loc": "14:10-14:11"
+    "loc": "14:13-14:14"
   },
   {
     "token": "NEWLINE",
-    "loc": "14:11-14:12"
+    "loc": "14:14-14:15"
   },
   {
     "token": "UNDERSCORE",
diff --git a/test/sync_test/__snapshot__/pipeline_test_tuple_struct3.json b/test/sync_test/__snapshot__/pipeline_test_tuple_struct3.json
index 41b5ada6..482bd4a1 100644
--- a/test/sync_test/__snapshot__/pipeline_test_tuple_struct3.json
+++ b/test/sync_test/__snapshot__/pipeline_test_tuple_struct3.json
@@ -102,297 +102,6 @@
       }
     }
   },
-  {
-    "kind": "Impl::TopFuncDef",
-    "loc": null,
-    "children": {
-      "fun_decl": {
-        "kind": "FunDecl",
-        "loc": null,
-        "children": {
-          "type_name": null,
-          "name": {
-            "kind": "Binder",
-            "loc": null,
-            "children": {
-              "name": "apply"
-            }
-          },
-          "has_error": null,
-          "is_async": null,
-          "decl_params": {
-            "kind": "FunDecl::ParameterList",
-            "loc": null,
-            "children": [
-              {
-                "kind": "Parameter::Positional",
-                "loc": null,
-                "children": {
-                  "binder": {
-                    "kind": "Binder",
-                    "loc": null,
-                    "children": {
-                      "name": "f"
-                    }
-                  },
-                  "ty": {
-                    "kind": "Type::Arrow",
-                    "loc": null,
-                    "children": {
-                      "args": {
-                        "kind": "Type::Arrow::ArgList",
-                        "loc": null,
-                        "children": [
-                          {
-                            "kind": "Type::Name",
-                            "loc": null,
-                            "children": {
-                              "constr_id": {
-                                "kind": "ConstrId",
-                                "loc": null,
-                                "children": {
-                                  "id": {
-                                    "kind": "LongIdent::Ident",
-                                    "loc": null,
-                                    "children": {
-                                      "value": "X"
-                                    }
-                                  }
-                                }
-                              },
-                              "tys": {
-                                "kind": "Type::Name::TypeList",
-                                "loc": null,
-                                "children": []
-                              }
-                            }
-                          }
-                        ]
-                      },
-                      "res": {
-                        "kind": "Type::Name",
-                        "loc": null,
-                        "children": {
-                          "constr_id": {
-                            "kind": "ConstrId",
-                            "loc": null,
-                            "children": {
-                              "id": {
-                                "kind": "LongIdent::Ident",
-                                "loc": null,
-                                "children": {
-                                  "value": "Y"
-                                }
-                              }
-                            }
-                          },
-                          "tys": {
-                            "kind": "Type::Name::TypeList",
-                            "loc": null,
-                            "children": []
-                          }
-                        }
-                      },
-                      "err": {
-                        "kind": "ErrorType::NoErrorType",
-                        "loc": null,
-                        "children": {}
-                      },
-                      "is_async": null
-                    }
-                  }
-                }
-              },
-              {
-                "kind": "Parameter::Positional",
-                "loc": null,
-                "children": {
-                  "binder": {
-                    "kind": "Binder",
-                    "loc": null,
-                    "children": {
-                      "name": "x"
-                    }
-                  },
-                  "ty": {
-                    "kind": "Type::Name",
-                    "loc": null,
-                    "children": {
-                      "constr_id": {
-                        "kind": "ConstrId",
-                        "loc": null,
-                        "children": {
-                          "id": {
-                            "kind": "LongIdent::Ident",
-                            "loc": null,
-                            "children": {
-                              "value": "X"
-                            }
-                          }
-                        }
-                      },
-                      "tys": {
-                        "kind": "Type::Name::TypeList",
-                        "loc": null,
-                        "children": []
-                      }
-                    }
-                  }
-                }
-              }
-            ]
-          },
-          "quantifiers": {
-            "kind": "FunDecl::QuantifierList",
-            "loc": null,
-            "children": [
-              {
-                "kind": "TypeVarBinder",
-                "loc": null,
-                "children": {
-                  "name": "X",
-                  "constraints": {
-                    "kind": "TypeVarBinder::TypeVarConstraintList",
-                    "loc": null,
-                    "children": []
-                  }
-                }
-              },
-              {
-                "kind": "TypeVarBinder",
-                "loc": null,
-                "children": {
-                  "name": "Y",
-                  "constraints": {
-                    "kind": "TypeVarBinder::TypeVarConstraintList",
-                    "loc": null,
-                    "children": []
-                  }
-                }
-              }
-            ]
-          },
-          "return_type": {
-            "kind": "Type::Name",
-            "loc": null,
-            "children": {
-              "constr_id": {
-                "kind": "ConstrId",
-                "loc": null,
-                "children": {
-                  "id": {
-                    "kind": "LongIdent::Ident",
-                    "loc": null,
-                    "children": {
-                      "value": "Y"
-                    }
-                  }
-                }
-              },
-              "tys": {
-                "kind": "Type::Name::TypeList",
-                "loc": null,
-                "children": []
-              }
-            }
-          },
-          "error_type": {
-            "kind": "ErrorType::NoErrorType",
-            "loc": null,
-            "children": {}
-          },
-          "vis": {
-            "kind": "Visibility::Default",
-            "loc": null,
-            "children": {}
-          },
-          "attrs": {
-            "kind": "FunDecl::AttrList",
-            "loc": null,
-            "children": []
-          },
-          "doc": ""
-        }
-      },
-      "decl_body": {
-        "kind": "DeclBody::DeclBody",
-        "loc": null,
-        "children": {
-          "local_types": {
-            "kind": "DeclBody::DeclBody::LocalTypeList",
-            "loc": null,
-            "children": []
-          },
-          "expr": {
-            "kind": "Expr::Apply",
-            "loc": null,
-            "children": {
-              "func": {
-                "kind": "Expr::Ident",
-                "loc": null,
-                "children": {
-                  "id": {
-                    "kind": "Var",
-                    "loc": null,
-                    "children": {
-                      "name": {
-                        "kind": "LongIdent::Ident",
-                        "loc": null,
-                        "children": {
-                          "value": "f"
-                        }
-                      }
-                    }
-                  }
-                }
-              },
-              "args": {
-                "kind": "Expr::Apply::ArgumentList",
-                "loc": null,
-                "children": [
-                  {
-                    "kind": "Argument",
-                    "loc": null,
-                    "children": {
-                      "value": {
-                        "kind": "Expr::Ident",
-                        "loc": null,
-                        "children": {
-                          "id": {
-                            "kind": "Var",
-                            "loc": null,
-                            "children": {
-                              "name": {
-                                "kind": "LongIdent::Ident",
-                                "loc": null,
-                                "children": {
-                                  "value": "x"
-                                }
-                              }
-                            }
-                          }
-                        }
-                      },
-                      "kind": {
-                        "kind": "ArgumentKind::Positional",
-                        "loc": null,
-                        "children": {}
-                      }
-                    }
-                  }
-                ]
-              },
-              "attr": {
-                "kind": "ApplyAttr::NoAttr",
-                "loc": null,
-                "children": {}
-              }
-            }
-          }
-        }
-      }
-    }
-  },
   {
     "kind": "Impl::TopFuncDef",
     "loc": null,
@@ -467,117 +176,48 @@
                 "loc": null,
                 "children": {
                   "func": {
-                    "kind": "Expr::Ident",
+                    "kind": "Expr::Constr",
                     "loc": null,
                     "children": {
-                      "id": {
-                        "kind": "Var",
+                      "constr": {
+                        "kind": "Constructor",
                         "loc": null,
                         "children": {
                           "name": {
-                            "kind": "LongIdent::Ident",
+                            "kind": "ConstrName",
                             "loc": null,
                             "children": {
-                              "value": "apply"
+                              "name": "T"
                             }
-                          }
-                        }
-                      }
-                    }
-                  },
-                  "args": {
-                    "kind": "Expr::Apply::ArgumentList",
-                    "loc": null,
-                    "children": [
-                      {
-                        "kind": "Argument",
-                        "loc": null,
-                        "children": {
-                          "value": {
-                            "kind": "Expr::Apply",
+                          },
+                          "extra_info": {
+                            "kind": "ConstructorExtraInfo::TypeName",
                             "loc": null,
                             "children": {
-                              "func": {
-                                "kind": "Expr::Constr",
+                              "value": {
+                                "kind": "TypeName",
                                 "loc": null,
                                 "children": {
-                                  "constr": {
-                                    "kind": "Constructor",
+                                  "name": {
+                                    "kind": "LongIdent::Ident",
                                     "loc": null,
                                     "children": {
-                                      "name": {
-                                        "kind": "ConstrName",
-                                        "loc": null,
-                                        "children": {
-                                          "name": "T"
-                                        }
-                                      },
-                                      "extra_info": {
-                                        "kind": "ConstructorExtraInfo::TypeName",
-                                        "loc": null,
-                                        "children": {
-                                          "value": {
-                                            "kind": "TypeName",
-                                            "loc": null,
-                                            "children": {
-                                              "name": {
-                                                "kind": "LongIdent::Ident",
-                                                "loc": null,
-                                                "children": {
-                                                  "value": "T"
-                                                }
-                                              },
-                                              "is_object": false
-                                            }
-                                          }
-                                        }
-                                      }
+                                      "value": "T"
                                     }
-                                  }
+                                  },
+                                  "is_object": false
                                 }
-                              },
-                              "args": {
-                                "kind": "Expr::Apply::ArgumentList",
-                                "loc": null,
-                                "children": [
-                                  {
-                                    "kind": "Argument",
-                                    "loc": null,
-                                    "children": {
-                                      "value": {
-                                        "kind": "Expr::Hole",
-                                        "loc": null,
-                                        "children": {
-                                          "kind": {
-                                            "kind": "Hole::Incomplete",
-                                            "loc": null,
-                                            "children": {}
-                                          }
-                                        }
-                                      },
-                                      "kind": {
-                                        "kind": "ArgumentKind::Positional",
-                                        "loc": null,
-                                        "children": {}
-                                      }
-                                    }
-                                  }
-                                ]
-                              },
-                              "attr": {
-                                "kind": "ApplyAttr::NoAttr",
-                                "loc": null,
-                                "children": {}
                               }
                             }
-                          },
-                          "kind": {
-                            "kind": "ArgumentKind::Positional",
-                            "loc": null,
-                            "children": {}
                           }
                         }
-                      },
+                      }
+                    }
+                  },
+                  "args": {
+                    "kind": "Expr::Apply::ArgumentList",
+                    "loc": null,
+                    "children": [
                       {
                         "kind": "Argument",
                         "loc": null,
@@ -824,19 +464,24 @@
                 "loc": null,
                 "children": {
                   "func": {
-                    "kind": "Expr::Ident",
+                    "kind": "Expr::Constr",
                     "loc": null,
                     "children": {
-                      "id": {
-                        "kind": "Var",
+                      "constr": {
+                        "kind": "Constructor",
                         "loc": null,
                         "children": {
                           "name": {
-                            "kind": "LongIdent::Ident",
+                            "kind": "ConstrName",
                             "loc": null,
                             "children": {
-                              "value": "apply"
+                              "name": "Some"
                             }
+                          },
+                          "extra_info": {
+                            "kind": "ConstructorExtraInfo::NoExtraInfo",
+                            "loc": null,
+                            "children": {}
                           }
                         }
                       }
@@ -846,80 +491,6 @@
                     "kind": "Expr::Apply::ArgumentList",
                     "loc": null,
                     "children": [
-                      {
-                        "kind": "Argument",
-                        "loc": null,
-                        "children": {
-                          "value": {
-                            "kind": "Expr::Apply",
-                            "loc": null,
-                            "children": {
-                              "func": {
-                                "kind": "Expr::Constr",
-                                "loc": null,
-                                "children": {
-                                  "constr": {
-                                    "kind": "Constructor",
-                                    "loc": null,
-                                    "children": {
-                                      "name": {
-                                        "kind": "ConstrName",
-                                        "loc": null,
-                                        "children": {
-                                          "name": "Some"
-                                        }
-                                      },
-                                      "extra_info": {
-                                        "kind": "ConstructorExtraInfo::NoExtraInfo",
-                                        "loc": null,
-                                        "children": {}
-                                      }
-                                    }
-                                  }
-                                }
-                              },
-                              "args": {
-                                "kind": "Expr::Apply::ArgumentList",
-                                "loc": null,
-                                "children": [
-                                  {
-                                    "kind": "Argument",
-                                    "loc": null,
-                                    "children": {
-                                      "value": {
-                                        "kind": "Expr::Hole",
-                                        "loc": null,
-                                        "children": {
-                                          "kind": {
-                                            "kind": "Hole::Incomplete",
-                                            "loc": null,
-                                            "children": {}
-                                          }
-                                        }
-                                      },
-                                      "kind": {
-                                        "kind": "ArgumentKind::Positional",
-                                        "loc": null,
-                                        "children": {}
-                                      }
-                                    }
-                                  }
-                                ]
-                              },
-                              "attr": {
-                                "kind": "ApplyAttr::NoAttr",
-                                "loc": null,
-                                "children": {}
-                              }
-                            }
-                          },
-                          "kind": {
-                            "kind": "ArgumentKind::Positional",
-                            "loc": null,
-                            "children": {}
-                          }
-                        }
-                      },
                       {
                         "kind": "Argument",
                         "loc": null,
diff --git a/test/sync_test/__snapshot__/pipeline_test_tuple_struct3.mbt b/test/sync_test/__snapshot__/pipeline_test_tuple_struct3.mbt
index 4fbf4413..81f27148 100644
--- a/test/sync_test/__snapshot__/pipeline_test_tuple_struct3.mbt
+++ b/test/sync_test/__snapshot__/pipeline_test_tuple_struct3.mbt
@@ -1,16 +1,12 @@
 struct T(Int?) derive (Show)
 
-fn[X, Y] apply(f: (X) -> Y, x: X) -> Y {
-  f(x)
-}
-
 fn init {
-  let a = apply(T::T(_), Option::Some(1))
+  let a = T::T(Option::Some(1))
   println(a)
 }
 
 fn init {
-  let a = apply(Some(_), 1)
+  let a = Some(1)
   println(a)
 }
 
diff --git a/test/sync_test/__snapshot__/pipeline_test_tuple_struct3.mbt.tokens.json b/test/sync_test/__snapshot__/pipeline_test_tuple_struct3.mbt.tokens.json
index 611dfb13..8c634fe9 100644
--- a/test/sync_test/__snapshot__/pipeline_test_tuple_struct3.mbt.tokens.json
+++ b/test/sync_test/__snapshot__/pipeline_test_tuple_struct3.mbt.tokens.json
@@ -67,688 +67,474 @@
     "token": "FN",
     "loc": "3:1-3:3"
   },
-  {
-    "token": "LBRACKET",
-    "loc": "3:3-3:4"
-  },
-  {
-    "token": [
-      "UIDENT",
-      "X"
-    ],
-    "loc": "3:4-3:5"
-  },
-  {
-    "token": "COMMA",
-    "loc": "3:5-3:6"
-  },
-  {
-    "token": [
-      "UIDENT",
-      "Y"
-    ],
-    "loc": "3:7-3:8"
-  },
-  {
-    "token": "RBRACKET",
-    "loc": "3:8-3:9"
-  },
-  {
-    "token": [
-      "LIDENT",
-      "apply"
-    ],
-    "loc": "3:10-3:15"
-  },
-  {
-    "token": "LPAREN",
-    "loc": "3:15-3:16"
-  },
-  {
-    "token": [
-      "LIDENT",
-      "f"
-    ],
-    "loc": "3:16-3:17"
-  },
-  {
-    "token": "COLON",
-    "loc": "3:17-3:18"
-  },
-  {
-    "token": "LPAREN",
-    "loc": "3:19-3:20"
-  },
-  {
-    "token": [
-      "UIDENT",
-      "X"
-    ],
-    "loc": "3:20-3:21"
-  },
-  {
-    "token": "RPAREN",
-    "loc": "3:21-3:22"
-  },
-  {
-    "token": "THIN_ARROW",
-    "loc": "3:23-3:25"
-  },
-  {
-    "token": [
-      "UIDENT",
-      "Y"
-    ],
-    "loc": "3:26-3:27"
-  },
-  {
-    "token": "COMMA",
-    "loc": "3:27-3:28"
-  },
-  {
-    "token": [
-      "LIDENT",
-      "x"
-    ],
-    "loc": "3:29-3:30"
-  },
-  {
-    "token": "COLON",
-    "loc": "3:30-3:31"
-  },
-  {
-    "token": [
-      "UIDENT",
-      "X"
-    ],
-    "loc": "3:32-3:33"
-  },
-  {
-    "token": "RPAREN",
-    "loc": "3:33-3:34"
-  },
-  {
-    "token": "THIN_ARROW",
-    "loc": "3:35-3:37"
-  },
-  {
-    "token": [
-      "UIDENT",
-      "Y"
-    ],
-    "loc": "3:38-3:39"
-  },
-  {
-    "token": "LBRACE",
-    "loc": "3:40-3:41"
-  },
-  {
-    "token": "NEWLINE",
-    "loc": "3:41-3:42"
-  },
-  {
-    "token": [
-      "LIDENT",
-      "f"
-    ],
-    "loc": "4:3-4:4"
-  },
-  {
-    "token": "LPAREN",
-    "loc": "4:4-4:5"
-  },
-  {
-    "token": [
-      "LIDENT",
-      "x"
-    ],
-    "loc": "4:5-4:6"
-  },
-  {
-    "token": "RPAREN",
-    "loc": "4:6-4:7"
-  },
-  {
-    "token": "NEWLINE",
-    "loc": "4:7-4:8"
-  },
-  {
-    "token": "RBRACE",
-    "loc": "5:1-5:2"
-  },
-  {
-    "token": [
-      "SEMI",
-      false
-    ],
-    "loc": "5:2-5:2"
-  },
-  {
-    "token": "NEWLINE",
-    "loc": "5:2-5:3"
-  },
-  {
-    "token": "NEWLINE",
-    "loc": "6:1-6:2"
-  },
-  {
-    "token": "FN",
-    "loc": "7:1-7:3"
-  },
   {
     "token": [
       "LIDENT",
       "init"
     ],
-    "loc": "7:4-7:8"
+    "loc": "3:4-3:8"
   },
   {
     "token": "LBRACE",
-    "loc": "7:9-7:10"
+    "loc": "3:9-3:10"
   },
   {
     "token": "NEWLINE",
-    "loc": "7:10-7:11"
+    "loc": "3:10-3:11"
   },
   {
     "token": "LET",
-    "loc": "8:3-8:6"
+    "loc": "4:3-4:6"
   },
   {
     "token": [
       "LIDENT",
       "a"
     ],
-    "loc": "8:7-8:8"
+    "loc": "4:7-4:8"
   },
   {
     "token": "EQUAL",
-    "loc": "8:9-8:10"
-  },
-  {
-    "token": [
-      "LIDENT",
-      "apply"
-    ],
-    "loc": "8:11-8:16"
-  },
-  {
-    "token": "LPAREN",
-    "loc": "8:16-8:17"
+    "loc": "4:9-4:10"
   },
   {
     "token": [
       "UIDENT",
       "T"
     ],
-    "loc": "8:17-8:18"
+    "loc": "4:11-4:12"
   },
   {
     "token": "COLONCOLON",
-    "loc": "8:18-8:20"
+    "loc": "4:12-4:14"
   },
   {
     "token": [
       "UIDENT",
       "T"
     ],
-    "loc": "8:20-8:21"
+    "loc": "4:14-4:15"
   },
   {
     "token": "LPAREN",
-    "loc": "8:21-8:22"
-  },
-  {
-    "token": "UNDERSCORE",
-    "loc": "8:22-8:23"
-  },
-  {
-    "token": "RPAREN",
-    "loc": "8:23-8:24"
-  },
-  {
-    "token": "COMMA",
-    "loc": "8:24-8:25"
+    "loc": "4:15-4:16"
   },
   {
     "token": [
       "UIDENT",
       "Option"
     ],
-    "loc": "8:26-8:32"
+    "loc": "4:16-4:22"
   },
   {
     "token": "COLONCOLON",
-    "loc": "8:32-8:34"
+    "loc": "4:22-4:24"
   },
   {
     "token": [
       "UIDENT",
       "Some"
     ],
-    "loc": "8:34-8:38"
+    "loc": "4:24-4:28"
   },
   {
     "token": "LPAREN",
-    "loc": "8:38-8:39"
+    "loc": "4:28-4:29"
   },
   {
     "token": [
       "INT",
       "1"
     ],
-    "loc": "8:39-8:40"
+    "loc": "4:29-4:30"
   },
   {
     "token": "RPAREN",
-    "loc": "8:40-8:41"
+    "loc": "4:30-4:31"
   },
   {
     "token": "RPAREN",
-    "loc": "8:41-8:42"
+    "loc": "4:31-4:32"
   },
   {
     "token": [
       "SEMI",
       false
     ],
-    "loc": "8:42-8:42"
+    "loc": "4:32-4:32"
   },
   {
     "token": "NEWLINE",
-    "loc": "8:42-8:43"
+    "loc": "4:32-4:33"
   },
   {
     "token": [
       "LIDENT",
       "println"
     ],
-    "loc": "9:3-9:10"
+    "loc": "5:3-5:10"
   },
   {
     "token": "LPAREN",
-    "loc": "9:10-9:11"
+    "loc": "5:10-5:11"
   },
   {
     "token": [
       "LIDENT",
       "a"
     ],
-    "loc": "9:11-9:12"
+    "loc": "5:11-5:12"
   },
   {
     "token": "RPAREN",
-    "loc": "9:12-9:13"
+    "loc": "5:12-5:13"
   },
   {
     "token": "NEWLINE",
-    "loc": "9:13-9:14"
+    "loc": "5:13-5:14"
   },
   {
     "token": "RBRACE",
-    "loc": "10:1-10:2"
+    "loc": "6:1-6:2"
   },
   {
     "token": [
       "SEMI",
       false
     ],
-    "loc": "10:2-10:2"
+    "loc": "6:2-6:2"
   },
   {
     "token": "NEWLINE",
-    "loc": "10:2-10:3"
+    "loc": "6:2-6:3"
   },
   {
     "token": "NEWLINE",
-    "loc": "11:1-11:2"
+    "loc": "7:1-7:2"
   },
   {
     "token": "FN",
-    "loc": "12:1-12:3"
+    "loc": "8:1-8:3"
   },
   {
     "token": [
       "LIDENT",
       "init"
     ],
-    "loc": "12:4-12:8"
+    "loc": "8:4-8:8"
   },
   {
     "token": "LBRACE",
-    "loc": "12:9-12:10"
+    "loc": "8:9-8:10"
   },
   {
     "token": "NEWLINE",
-    "loc": "12:10-12:11"
+    "loc": "8:10-8:11"
   },
   {
     "token": "LET",
-    "loc": "13:3-13:6"
+    "loc": "9:3-9:6"
   },
   {
     "token": [
       "LIDENT",
       "a"
     ],
-    "loc": "13:7-13:8"
+    "loc": "9:7-9:8"
   },
   {
     "token": "EQUAL",
-    "loc": "13:9-13:10"
-  },
-  {
-    "token": [
-      "LIDENT",
-      "apply"
-    ],
-    "loc": "13:11-13:16"
-  },
-  {
-    "token": "LPAREN",
-    "loc": "13:16-13:17"
+    "loc": "9:9-9:10"
   },
   {
     "token": [
       "UIDENT",
       "Some"
     ],
-    "loc": "13:17-13:21"
+    "loc": "9:11-9:15"
   },
   {
     "token": "LPAREN",
-    "loc": "13:21-13:22"
-  },
-  {
-    "token": "UNDERSCORE",
-    "loc": "13:22-13:23"
-  },
-  {
-    "token": "RPAREN",
-    "loc": "13:23-13:24"
-  },
-  {
-    "token": "COMMA",
-    "loc": "13:24-13:25"
+    "loc": "9:15-9:16"
   },
   {
     "token": [
       "INT",
       "1"
     ],
-    "loc": "13:26-13:27"
+    "loc": "9:16-9:17"
   },
   {
     "token": "RPAREN",
-    "loc": "13:27-13:28"
+    "loc": "9:17-9:18"
   },
   {
     "token": [
       "SEMI",
       false
     ],
-    "loc": "13:28-13:28"
+    "loc": "9:18-9:18"
   },
   {
     "token": "NEWLINE",
-    "loc": "13:28-13:29"
+    "loc": "9:18-9:19"
   },
   {
     "token": [
       "LIDENT",
       "println"
     ],
-    "loc": "14:3-14:10"
+    "loc": "10:3-10:10"
   },
   {
     "token": "LPAREN",
-    "loc": "14:10-14:11"
+    "loc": "10:10-10:11"
   },
   {
     "token": [
       "LIDENT",
       "a"
     ],
-    "loc": "14:11-14:12"
+    "loc": "10:11-10:12"
   },
   {
     "token": "RPAREN",
-    "loc": "14:12-14:13"
+    "loc": "10:12-10:13"
   },
   {
     "token": "NEWLINE",
-    "loc": "14:13-14:14"
+    "loc": "10:13-10:14"
   },
   {
     "token": "RBRACE",
-    "loc": "15:1-15:2"
+    "loc": "11:1-11:2"
   },
   {
     "token": [
       "SEMI",
       false
     ],
-    "loc": "15:2-15:2"
+    "loc": "11:2-11:2"
   },
   {
     "token": "NEWLINE",
-    "loc": "15:2-15:3"
+    "loc": "11:2-11:3"
   },
   {
     "token": "NEWLINE",
-    "loc": "16:1-16:2"
+    "loc": "12:1-12:2"
   },
   {
     "token": "STRUCT",
-    "loc": "17:1-17:7"
+    "loc": "13:1-13:7"
   },
   {
     "token": [
       "UIDENT",
       "Point"
     ],
-    "loc": "17:8-17:13"
+    "loc": "13:8-13:13"
   },
   {
     "token": "LPAREN",
-    "loc": "17:13-17:14"
+    "loc": "13:13-13:14"
   },
   {
     "token": [
       "UIDENT",
       "Int"
     ],
-    "loc": "17:14-17:17"
+    "loc": "13:14-13:17"
   },
   {
     "token": "COMMA",
-    "loc": "17:17-17:18"
+    "loc": "13:17-13:18"
   },
   {
     "token": [
       "UIDENT",
       "Int"
     ],
-    "loc": "17:18-17:21"
+    "loc": "13:18-13:21"
   },
   {
     "token": "COMMA",
-    "loc": "17:21-17:22"
+    "loc": "13:21-13:22"
   },
   {
     "token": [
       "UIDENT",
       "Int"
     ],
-    "loc": "17:22-17:25"
+    "loc": "13:22-13:25"
   },
   {
     "token": "RPAREN",
-    "loc": "17:25-17:26"
+    "loc": "13:25-13:26"
   },
   {
     "token": "DERIVE",
-    "loc": "17:27-17:33"
+    "loc": "13:27-13:33"
   },
   {
     "token": "LPAREN",
-    "loc": "17:33-17:34"
+    "loc": "13:33-13:34"
   },
   {
     "token": [
       "UIDENT",
       "ToJson"
     ],
-    "loc": "17:34-17:40"
+    "loc": "13:34-13:40"
   },
   {
     "token": "RPAREN",
-    "loc": "17:40-17:41"
+    "loc": "13:40-13:41"
   },
   {
     "token": [
       "SEMI",
       false
     ],
-    "loc": "17:41-17:41"
+    "loc": "13:41-13:41"
   },
   {
     "token": "NEWLINE",
-    "loc": "17:41-17:42"
+    "loc": "13:41-13:42"
   },
   {
     "token": "NEWLINE",
-    "loc": "18:1-18:2"
+    "loc": "14:1-14:2"
   },
   {
     "token": "FN",
-    "loc": "19:1-19:3"
+    "loc": "15:1-15:3"
   },
   {
     "token": [
       "LIDENT",
       "init"
     ],
-    "loc": "19:4-19:8"
+    "loc": "15:4-15:8"
   },
   {
     "token": "LBRACE",
-    "loc": "19:9-19:10"
+    "loc": "15:9-15:10"
   },
   {
     "token": "NEWLINE",
-    "loc": "19:10-19:11"
+    "loc": "15:10-15:11"
   },
   {
     "token": [
       "LIDENT",
       "println"
     ],
-    "loc": "20:3-20:10"
+    "loc": "16:3-16:10"
   },
   {
     "token": "LPAREN",
-    "loc": "20:10-20:11"
+    "loc": "16:10-16:11"
   },
   {
     "token": [
       "UIDENT",
       "Point"
     ],
-    "loc": "20:11-20:16"
+    "loc": "16:11-16:16"
   },
   {
     "token": "LPAREN",
-    "loc": "20:16-20:17"
+    "loc": "16:16-16:17"
   },
   {
     "token": [
       "INT",
       "1"
     ],
-    "loc": "20:17-20:18"
+    "loc": "16:17-16:18"
   },
   {
     "token": "COMMA",
-    "loc": "20:18-20:19"
+    "loc": "16:18-16:19"
   },
   {
     "token": [
       "INT",
       "2"
     ],
-    "loc": "20:19-20:20"
+    "loc": "16:19-16:20"
   },
   {
     "token": "COMMA",
-    "loc": "20:20-20:21"
+    "loc": "16:20-16:21"
   },
   {
     "token": [
       "INT",
       "3"
     ],
-    "loc": "20:21-20:22"
+    "loc": "16:21-16:22"
   },
   {
     "token": "RPAREN",
-    "loc": "20:22-20:23"
+    "loc": "16:22-16:23"
   },
   {
     "token": [
       "DOT_LIDENT",
       "to_json"
     ],
-    "loc": "20:24-20:31"
+    "loc": "16:24-16:31"
   },
   {
     "token": "LPAREN",
-    "loc": "20:31-20:32"
+    "loc": "16:31-16:32"
   },
   {
     "token": "RPAREN",
-    "loc": "20:32-20:33"
+    "loc": "16:32-16:33"
   },
   {
     "token": [
       "DOT_LIDENT",
       "stringify"
     ],
-    "loc": "20:34-20:43"
+    "loc": "16:34-16:43"
   },
   {
     "token": "LPAREN",
-    "loc": "20:43-20:44"
+    "loc": "16:43-16:44"
   },
   {
     "token": "RPAREN",
-    "loc": "20:44-20:45"
+    "loc": "16:44-16:45"
   },
   {
     "token": "RPAREN",
-    "loc": "20:45-20:46"
+    "loc": "16:45-16:46"
   },
   {
     "token": "NEWLINE",
-    "loc": "20:46-20:47"
+    "loc": "16:46-16:47"
   },
   {
     "token": "RBRACE",
-    "loc": "21:1-21:2"
+    "loc": "17:1-17:2"
   },
   {
     "token": [
       "SEMI",
       false
     ],
-    "loc": "21:2-21:2"
+    "loc": "17:2-17:2"
   },
   {
     "token": "NEWLINE",
-    "loc": "21:2-21:3"
+    "loc": "17:2-17:3"
   },
   {
     "token": "EOF",
-    "loc": "22:1-22:1"
+    "loc": "18:1-18:1"
   }
 ]
\ No newline at end of file
diff --git a/test/sync_test/__snapshot__/pipeline_test_valtype_indirect_rec.json b/test/sync_test/__snapshot__/pipeline_test_valtype_indirect_rec.json
index 0573274e..acc14c9a 100644
--- a/test/sync_test/__snapshot__/pipeline_test_valtype_indirect_rec.json
+++ b/test/sync_test/__snapshot__/pipeline_test_valtype_indirect_rec.json
@@ -604,37 +604,90 @@
                             "loc": null,
                             "children": {
                               "value": {
-                                "kind": "Expr::DotApply",
+                                "kind": "Expr::Function",
                                 "loc": null,
                                 "children": {
-                                  "self": {
-                                    "kind": "Expr::Hole",
+                                  "func": {
+                                    "kind": "Func::Lambda",
                                     "loc": null,
                                     "children": {
+                                      "parameters": {
+                                        "kind": "Func::Lambda::ParameterList",
+                                        "loc": null,
+                                        "children": [
+                                          {
+                                            "kind": "Parameter::Positional",
+                                            "loc": null,
+                                            "children": {
+                                              "binder": {
+                                                "kind": "Binder",
+                                                "loc": null,
+                                                "children": {
+                                                  "name": "n"
+                                                }
+                                              },
+                                              "ty": null
+                                            }
+                                          }
+                                        ]
+                                      },
+                                      "body": {
+                                        "kind": "Expr::DotApply",
+                                        "loc": null,
+                                        "children": {
+                                          "self": {
+                                            "kind": "Expr::Ident",
+                                            "loc": null,
+                                            "children": {
+                                              "id": {
+                                                "kind": "Var",
+                                                "loc": null,
+                                                "children": {
+                                                  "name": {
+                                                    "kind": "LongIdent::Ident",
+                                                    "loc": null,
+                                                    "children": {
+                                                      "value": "n"
+                                                    }
+                                                  }
+                                                }
+                                              }
+                                            }
+                                          },
+                                          "method_name": {
+                                            "kind": "Label",
+                                            "loc": null,
+                                            "children": {
+                                              "name": "to_int"
+                                            }
+                                          },
+                                          "args": {
+                                            "kind": "Expr::DotApply::ArgList",
+                                            "loc": null,
+                                            "children": []
+                                          },
+                                          "return_self": false,
+                                          "attr": {
+                                            "kind": "ApplyAttr::NoAttr",
+                                            "loc": null,
+                                            "children": {}
+                                          }
+                                        }
+                                      },
+                                      "return_type": null,
+                                      "error_type": {
+                                        "kind": "ErrorType::NoErrorType",
+                                        "loc": null,
+                                        "children": {}
+                                      },
                                       "kind": {
-                                        "kind": "Hole::Incomplete",
+                                        "kind": "FnKind::Arrow",
                                         "loc": null,
                                         "children": {}
-                                      }
-                                    }
-                                  },
-                                  "method_name": {
-                                    "kind": "Label",
-                                    "loc": null,
-                                    "children": {
-                                      "name": "to_int"
+                                      },
+                                      "has_error": null,
+                                      "is_async": null
                                     }
-                                  },
-                                  "args": {
-                                    "kind": "Expr::DotApply::ArgList",
-                                    "loc": null,
-                                    "children": []
-                                  },
-                                  "return_self": false,
-                                  "attr": {
-                                    "kind": "ApplyAttr::NoAttr",
-                                    "loc": null,
-                                    "children": {}
                                   }
                                 }
                               },
diff --git a/test/sync_test/__snapshot__/pipeline_test_valtype_indirect_rec.mbt b/test/sync_test/__snapshot__/pipeline_test_valtype_indirect_rec.mbt
index 5f2650f7..225c8e64 100644
--- a/test/sync_test/__snapshot__/pipeline_test_valtype_indirect_rec.mbt
+++ b/test/sync_test/__snapshot__/pipeline_test_valtype_indirect_rec.mbt
@@ -9,7 +9,7 @@ struct S {
 
 ///|
 fn f(x : FixedArray[S]) -> Int {
-  x[0].a + x[0].b.map(_.to_int()).unwrap_or(x[1].a)
+  x[0].a + x[0].b.map(n => n.to_int()).unwrap_or(x[1].a)
 }
 
 ///|
diff --git a/test/sync_test/__snapshot__/pipeline_test_valtype_indirect_rec.mbt.tokens.json b/test/sync_test/__snapshot__/pipeline_test_valtype_indirect_rec.mbt.tokens.json
index e074fb87..92a926ce 100644
--- a/test/sync_test/__snapshot__/pipeline_test_valtype_indirect_rec.mbt.tokens.json
+++ b/test/sync_test/__snapshot__/pipeline_test_valtype_indirect_rec.mbt.tokens.json
@@ -386,75 +386,89 @@
     "loc": "12:22-12:23"
   },
   {
-    "token": "UNDERSCORE",
+    "token": [
+      "LIDENT",
+      "n"
+    ],
     "loc": "12:23-12:24"
   },
+  {
+    "token": "FAT_ARROW",
+    "loc": "12:25-12:27"
+  },
+  {
+    "token": [
+      "LIDENT",
+      "n"
+    ],
+    "loc": "12:28-12:29"
+  },
   {
     "token": [
       "DOT_LIDENT",
       "to_int"
     ],
-    "loc": "12:25-12:31"
+    "loc": "12:30-12:36"
   },
   {
     "token": "LPAREN",
-    "loc": "12:31-12:32"
+    "loc": "12:36-12:37"
   },
   {
     "token": "RPAREN",
-    "loc": "12:32-12:33"
+    "loc": "12:37-12:38"
   },
   {
     "token": "RPAREN",
-    "loc": "12:33-12:34"
+    "loc": "12:38-12:39"
   },
   {
     "token": [
       "DOT_LIDENT",
       "unwrap_or"
     ],
-    "loc": "12:35-12:44"
+    "loc": "12:40-12:49"
   },
   {
     "token": "LPAREN",
-    "loc": "12:44-12:45"
+    "loc": "12:49-12:50"
   },
   {
     "token": [
       "LIDENT",
       "x"
     ],
-    "loc": "12:45-12:46"
+    "loc": "12:50-12:51"
   },
   {
     "token": "LBRACKET",
-    "loc": "12:46-12:47"
+    "loc": "12:51-12:52"
   },
   {
     "token": [
       "INT",
       "1"
     ],
-    "loc": "12:47-12:48"
+    "loc": "12:52-12:53"
   },
   {
     "token": "RBRACKET",
-    "loc": "12:48-12:49"
+    "loc": "12:53-12:54"
   },
   {
     "token": [
       "DOT_LIDENT",
       "a"
     ],
-    "loc": "12:50-12:51"
+    "loc": "12:55-12:56"
   },
   {
     "token": "RPAREN",
-    "loc": "12:51-12:52"
+    "loc": "12:56-12:57"
   },
   {
     "token": "NEWLINE",
-    "loc": "12:52-12:53"
+    "loc": "12:57-12:58"
   },
   {
     "token": "RBRACE",
diff --git a/test/sync_test/lexer_test.mbt b/test/sync_test/lexer_test.mbt
index b3f7abc0..85b336a0 100644
--- a/test/sync_test/lexer_test.mbt
+++ b/test/sync_test/lexer_test.mbt
@@ -640,6 +640,11 @@ test "lexing pipeline_test_valstruct_error" (t : @test.Test) {
   lexer_test(t)
 }
 
+///|
+test "lexing parse_test_nobreak" (t : @test.Test) {
+  lexer_test(t)
+}
+
 ///|
 test "lexing pipeline_test_trait" (t : @test.Test) {
   lexer_test(t)
@@ -2204,6 +2209,11 @@ test "lexing pipeline_test_closure6" (t : @test.Test) {
   lexer_test(t)
 }
 
+///|
+test "lexing pipeline_test_lexmatch_no_regex" (t : @test.Test) {
+  lexer_test(t)
+}
+
 ///|
 test "lexing pipeline_test_call_trait_method" (t : @test.Test) {
   lexer_test(t)
@@ -3016,6 +3026,11 @@ test "lexing pipeline_test_closure_example" (t : @test.Test) {
   lexer_test(t)
 }
 
+///|
+test "lexing pipeline_test_loopify_corner_case" (t : @test.Test) {
+  lexer_test(t)
+}
+
 ///|
 test "lexing pipeline_test_smart_switch_constant" (t : @test.Test) {
   lexer_test(t)
@@ -3051,6 +3066,11 @@ test "lexing pipeline_test_guard" (t : @test.Test) {
   lexer_test(t)
 }
 
+///|
+test "lexing parse_test_catch_noraise" (t : @test.Test) {
+  lexer_test(t)
+}
+
 ///|
 test "lexing parse_test_no_trailing_newline_ffi1" (t : @test.Test) {
   lexer_test(t)
@@ -4676,6 +4696,11 @@ test "lexing pipeline_test_range_pattern" (t : @test.Test) {
   lexer_test(t)
 }
 
+///|
+test "lexing pipeline_test_local_tuple_struct" (t : @test.Test) {
+  lexer_test(t)
+}
+
 ///|
 test "lexing pipeline_test_contify_return2" (t : @test.Test) {
   lexer_test(t)
@@ -5356,6 +5381,11 @@ test "lexing pipeline_test_recursive_ltype" (t : @test.Test) {
   lexer_test(t)
 }
 
+///|
+test "lexing pipeline_test_lexmatch_fastpath" (t : @test.Test) {
+  lexer_test(t)
+}
+
 ///|
 test "lexing pipeline_test_tail_catch" (t : @test.Test) {
   lexer_test(t)
diff --git a/test/sync_test/parser_test.mbt b/test/sync_test/parser_test.mbt
index efa00d0e..0d9d8069 100644
--- a/test/sync_test/parser_test.mbt
+++ b/test/sync_test/parser_test.mbt
@@ -45,6 +45,11 @@ test "pipeline_test_ycombinator" (t : @test.Test) {
   t.run()
 }
 
+///|
+test "pipeline_test_lexmatch_no_regex" (t : @test.Test) {
+  t.run()
+}
+
 ///|
 test "pipeline_test_009" (t : @test.Test) {
   t.run()
@@ -245,12 +250,6 @@ test "pipeline_test_functional_loop3" (t : @test.Test) {
   t.run()
 }
 
-///|
-// NEED_UPDATE:
-// test "parse_test_struct_constructor" (t : @test.Test) {
-// t.run()
-// }
-
 ///|
 test "pipeline_test_string_from_uint16_array" (t : @test.Test) {
   t.run()
@@ -391,11 +390,6 @@ test "pipeline_test_008" (t : @test.Test) {
   t.run()
 }
 
-///|
-test "parse_test_tuple_multiline_str" (t : @test.Test) {
-  t.run()
-}
-
 ///|
 test "pipeline_test_return_in_async_suspend" (t : @test.Test) {
   t.run()
@@ -512,10 +506,9 @@ test "pipeline_test_bitstring_rev" (t : @test.Test) {
 }
 
 ///|
-// NEED_UPDATE:
-// test "pipeline_test_typing_coverage_lexmatch" (t : @test.Test) {
-//   t.run()
-// }
+test "pipeline_test_typing_coverage_lexmatch" (t : @test.Test) {
+  t.run()
+}
 
 ///|
 test "pipeline_test_option_test" (t : @test.Test) {
@@ -552,11 +545,6 @@ test "pipeline_test_trait_obj3" (t : @test.Test) {
   t.run()
 }
 
-///|
-test "parse_test_old_maybe_error_return_syntax" (t : @test.Test) {
-  t.run()
-}
-
 ///|
 test "pipeline_test_pattern_guard2" (t : @test.Test) {
   t.run()
@@ -602,6 +590,11 @@ test "pipeline_test_is_expr_complex_cond" (t : @test.Test) {
   t.run()
 }
 
+///|
+test "pipeline_test_loopify_corner_case" (t : @test.Test) {
+  t.run()
+}
+
 ///|
 test "pipeline_test_pattern_guard_evil" (t : @test.Test) {
   t.run()
@@ -832,11 +825,6 @@ test "pipeline_test_closure4" (t : @test.Test) {
   t.run()
 }
 
-///|
-test "parse_test_postfix_label" (t : @test.Test) {
-  t.run()
-}
-
 ///|
 test "pipeline_test_impure" (t : @test.Test) {
   t.run()
@@ -1078,10 +1066,9 @@ test "pipeline_test_int64_range_pattern" (t : @test.Test) {
 }
 
 ///|
-// NEED_UPDATE
-// test "pipeline_test_tokenize_suffix" (t : @test.Test) {
-//   t.run()
-// }
+test "pipeline_test_tokenize_suffix" (t : @test.Test) {
+  t.run()
+}
 
 ///|
 test "pipeline_test_local_type6" (t : @test.Test) {
@@ -1199,10 +1186,9 @@ test "pipeline_test_error_poly_tail_rec" (t : @test.Test) {
 }
 
 ///|
-// NEED_UPDATE
-// test "pipeline_test_lexmatch_bug1" (t : @test.Test) {
-//   t.run()
-// }
+test "pipeline_test_lexmatch_bug1" (t : @test.Test) {
+  t.run()
+}
 
 ///|
 test "pipeline_test_loop_label" (t : @test.Test) {
@@ -1334,11 +1320,6 @@ test "pipeline_test_unicode_test" (t : @test.Test) {
   t.run()
 }
 
-///|
-test "parse_test_attribute" (t : @test.Test) {
-  t.run()
-}
-
 ///|
 test "pipeline_test_003" (t : @test.Test) {
   t.run()
@@ -1379,11 +1360,6 @@ test "pipeline_test_method1" (t : @test.Test) {
   t.run()
 }
 
-///|
-test "parse_test_range_pattern" (t : @test.Test) {
-  t.run()
-}
-
 ///|
 test "pipeline_test_err_try_exclamation2" (t : @test.Test) {
   t.run()
@@ -1515,10 +1491,9 @@ test "pipeline_test_constr_pattern_no_payload" (t : @test.Test) {
 }
 
 ///|
-// NEED_UPDATE
-// test "pipeline_test_lisp_tokenizer" (t : @test.Test) {
-//  t.run()
-// }
+test "pipeline_test_lisp_tokenizer" (t : @test.Test) {
+  t.run()
+}
 
 ///|
 test "pipeline_test_mcore_inline" (t : @test.Test) {
@@ -1595,6 +1570,11 @@ test "pipeline_test_empty_file" (t : @test.Test) {
   t.run()
 }
 
+///|
+test "pipeline_test_lexmatch_fastpath" (t : @test.Test) {
+  t.run()
+}
+
 ///|
 test "pipeline_test_readonlyarray_recgroup" (t : @test.Test) {
   t.run()
@@ -1640,6 +1620,11 @@ test "pipeline_test_trait_obj_bound" (t : @test.Test) {
   t.run()
 }
 
+///|
+test "pipeline_test_error_poly_iter" (t : @test.Test) {
+  t.run()
+}
+
 ///|
 test "pipeline_test_err_array_set" (t : @test.Test) {
   t.run()
@@ -1656,13 +1641,12 @@ test "pipeline_test_annotation_node" (t : @test.Test) {
 }
 
 ///|
-// NEED_UPDATE
-// test "pipeline_test_match_regex_utf8_bug" (t : @test.Test) {
-//  t.run()
-// }
+test "pipeline_test_match_regex_utf8_bug" (t : @test.Test) {
+  t.run()
+}
 
 ///|
-// EDGE CASE
+// FIXTHIS: EDGE CASE
 // test "parse_test_docstring" (t : @test.Test) {
 //   t.run()
 // }
@@ -1702,12 +1686,6 @@ test "pipeline_test_disambiguation" (t : @test.Test) {
   t.run()
 }
 
-///|
-// DELAY_TO_NEXT_SYNC(original test is broken)
-// test "parse_test_error_type_question" (t : @test.Test) {
-//   t.run()
-// }
-
 ///|
 test "pipeline_test_toplevel_alias" (t : @test.Test) {
   t.run()
@@ -1829,10 +1807,9 @@ test "pipeline_test_enum_repr" (t : @test.Test) {
 }
 
 ///|
-// NEED_UPDATE
-// test "pipeline_test_dfa_state_test" (t : @test.Test) {
-//  t.run()
-// }
+test "pipeline_test_dfa_state_test" (t : @test.Test) {
+  t.run()
+}
 
 ///|
 test "parse_test_operator_bitwise_or" (t : @test.Test) {
@@ -2029,11 +2006,6 @@ test "pipeline_test_newtype4" (t : @test.Test) {
   t.run()
 }
 
-///|
-test "parse_test_bytes_literal" (t : @test.Test) {
-  t.run()
-}
-
 ///|
 test "pipeline_test_005" (t : @test.Test) {
   t.run()
@@ -2159,11 +2131,6 @@ test "pipeline_test_error_handle10" (t : @test.Test) {
   t.run()
 }
 
-///|
-test "parse_test_try_expr_catch_bang" (t : @test.Test) {
-  t.run()
-}
-
 ///|
 test "pipeline_test_is_lexmatch" (t : @test.Test) {
   t.run()
@@ -2285,10 +2252,9 @@ test "pipeline_test_loop_arg_side_effect" (t : @test.Test) {
 }
 
 ///|
-// NEED_UPDATE
-// test "parse_test_lexmatch_pattern_sequence_semicolon_and_regex" (t : @test.Test) {
-//   t.run()
-// }
+test "parse_test_lexmatch_pattern_sequence_semicolon_and_regex" (t : @test.Test) {
+  t.run()
+}
 
 ///|
 test "pipeline_test_specialize_local_fn" (t : @test.Test) {
@@ -2320,11 +2286,6 @@ test "pipeline_test_match_tuple" (t : @test.Test) {
   t.run()
 }
 
-///|
-test "parse_test_multiline_string_literals" (t : @test.Test) {
-  t.run()
-}
-
 ///|
 test "pipeline_test_return_in_join" (t : @test.Test) {
   t.run()
@@ -2340,21 +2301,11 @@ test "pipeline_test_constant_error_constructor" (t : @test.Test) {
   t.run()
 }
 
-///|
-// test "parse_test_traitalias_pkg_single_target" (t : @test.Test) {
-//  t.run()
-// }
-
 ///|
 test "pipeline_test_value_enum_array" (t : @test.Test) {
   t.run()
 }
 
-///|
-test "parse_test_postfix_catch_all" (t : @test.Test) {
-  t.run()
-}
-
 ///|
 test "pipeline_test_large_data_section2" (t : @test.Test) {
   t.run()
@@ -2510,6 +2461,11 @@ test "pipeline_test_trait_obj_simple" (t : @test.Test) {
   t.run()
 }
 
+///|
+test "pipeline_test_async_trait" (t : @test.Test) {
+  t.run()
+}
+
 ///|
 test "pipeline_test_float32" (t : @test.Test) {
   t.run()
@@ -2576,10 +2532,9 @@ test "pipeline_test_012" (t : @test.Test) {
 }
 
 ///|
-// NEED_UPDATE
-// test "pipeline_test_struct_constructor" (t : @test.Test) {
-//  t.run()
-// }
+test "pipeline_test_struct_constructor" (t : @test.Test) {
+  t.run()
+}
 
 ///|
 test "pipeline_test_match_bytes_constant" (t : @test.Test) {
@@ -2712,10 +2667,9 @@ test "parse_test_paren_constraint_pattern" (t : @test.Test) {
 }
 
 ///|
-// NEED_UPDATE
-// test "pipeline_test_codepoint_at" (t : @test.Test) {
-//   t.run()
-// }
+test "pipeline_test_codepoint_at" (t : @test.Test) {
+  t.run()
+}
 
 ///|
 test "pipeline_test_neg" (t : @test.Test) {
@@ -2792,11 +2746,6 @@ test "pipeline_test_labelled_prim" (t : @test.Test) {
   t.run()
 }
 
-///|
-test "parse_test_function_type_with_trailing_comma" (t : @test.Test) {
-  t.run()
-}
-
 ///|
 test "pipeline_test_topo_sort_default_arg" (t : @test.Test) {
   t.run()
@@ -2943,10 +2892,9 @@ test "pipeline_test_autoloc2" (t : @test.Test) {
 }
 
 ///|
-// NEED_UPDATE
-// test "pipeline_test_match_using_regex_calc" (t : @test.Test) {
-//  t.run()
-// }
+test "pipeline_test_match_using_regex_calc" (t : @test.Test) {
+  t.run()
+}
 
 ///|
 test "pipeline_test_labelled_arg" (t : @test.Test) {
@@ -2973,11 +2921,6 @@ test "pipeline_test_tuple_struct_array" (t : @test.Test) {
   t.run()
 }
 
-///|
-test "parse_test_fnalias" (t : @test.Test) {
-  t.run()
-}
-
 ///|
 test "pipeline_test_eq_type" (t : @test.Test) {
   t.run()
@@ -3233,6 +3176,11 @@ test "pipeline_test_toplevel_pat" (t : @test.Test) {
   t.run()
 }
 
+///|
+test "pipeline_test_local_tuple_struct" (t : @test.Test) {
+  t.run()
+}
+
 ///|
 test "parse_test_cascade" (t : @test.Test) {
   t.run()
@@ -3284,10 +3232,9 @@ test "pipeline_test_error_handle6" (t : @test.Test) {
 }
 
 ///|
-// NEED_UPDATE
-// test "parse_test_lexmatch" (t : @test.Test) {
-//  t.run()
-// }
+test "parse_test_lexmatch" (t : @test.Test) {
+  t.run()
+}
 
 ///|
 test "pipeline_test_float_inf" (t : @test.Test) {
@@ -3374,6 +3321,11 @@ test "pipeline_test_trait_method_no_self" (t : @test.Test) {
   t.run()
 }
 
+///|
+test "parse_test_catch_noraise" (t : @test.Test) {
+  t.run()
+}
+
 ///|
 test "pipeline_test_newtype3" (t : @test.Test) {
   t.run()
@@ -3409,6 +3361,11 @@ test "pipeline_test_multiline_string_literals" (t : @test.Test) {
   t.run()
 }
 
+///|
+test "pipeline_test_error_tail" (t : @test.Test) {
+  t.run()
+}
+
 ///|
 test "pipeline_test_newtype_of_func" (t : @test.Test) {
   t.run()
@@ -3484,6 +3441,11 @@ test "pipeline_test_const_propagate" (t : @test.Test) {
   t.run()
 }
 
+///|
+test "pipeline_test_error_enum_match" (t : @test.Test) {
+  t.run()
+}
+
 ///|
 test "parse_test_no_trailing_newline_let" (t : @test.Test) {
   t.run()
@@ -3664,11 +3626,6 @@ test "pipeline_test_let_func" (t : @test.Test) {
   t.run()
 }
 
-///|
-test "parse_test_async_test" (t : @test.Test) {
-  t.run()
-}
-
 ///|
 test "pipeline_test_array_intrinsic" (t : @test.Test) {
   t.run()
@@ -3759,6 +3716,11 @@ test "pipeline_test_valtype_indirect_rec" (t : @test.Test) {
   t.run()
 }
 
+///|
+test "pipeline_test_try_result_type" (t : @test.Test) {
+  t.run()
+}
+
 ///|
 test "pipeline_test_print_float" (t : @test.Test) {
   t.run()
@@ -3820,10 +3782,9 @@ test "pipeline_test_bytes_utils_wasm" (t : @test.Test) {
 }
 
 ///|
-// NEED_UPDATE
-// test "pipeline_test_match_using_regex_wordcount" (t : @test.Test) {
-//  t.run()
-// }
+test "pipeline_test_match_using_regex_wordcount" (t : @test.Test) {
+  t.run()
+}
 
 ///|
 test "parse_test_no_trailing_newline_struct" (t : @test.Test) {
@@ -3840,11 +3801,6 @@ test "pipeline_test_label_loop_foreach2" (t : @test.Test) {
   t.run()
 }
 
-///|
-test "parse_test_catch_all" (t : @test.Test) {
-  t.run()
-}
-
 ///|
 test "pipeline_test_trait_upcast" (t : @test.Test) {
   t.run()
@@ -3860,11 +3816,6 @@ test "pipeline_test_error_poly_dce" (t : @test.Test) {
   t.run()
 }
 
-///|
-test "parse_test_fn_exclamation" (t : @test.Test) {
-  t.run()
-}
-
 ///|
 test "pipeline_test_err_handle" (t : @test.Test) {
   t.run()
@@ -3986,10 +3937,9 @@ test "parse_test_docstring2" (t : @test.Test) {
 }
 
 ///|
-// NEED_UPDATE
-// test "pipeline_test_match_stringview_using_regex" (t : @test.Test) {
-//   t.run()
-// }
+test "pipeline_test_match_stringview_using_regex" (t : @test.Test) {
+  t.run()
+}
 
 ///|
 test "pipeline_test_derive_debug" (t : @test.Test) {
@@ -4177,10 +4127,9 @@ test "pipeline_test_init_order" (t : @test.Test) {
 }
 
 ///|
-// NEED_UPDATE
-// test "pipeline_test_lexmatch_first_guard" (t : @test.Test) {
-//  t.run()
-// }
+test "pipeline_test_lexmatch_first_guard" (t : @test.Test) {
+  t.run()
+}
 
 ///|
 test "pipeline_test_default_method" (t : @test.Test) {
@@ -4312,11 +4261,6 @@ test "pipeline_test_complex_pattern_guard2" (t : @test.Test) {
   t.run()
 }
 
-///|
-test "parse_test_extern_type" (t : @test.Test) {
-  t.run()
-}
-
 ///|
 test "pipeline_test_first_class_trait_method" (t : @test.Test) {
   t.run()
@@ -4488,10 +4432,9 @@ test "pipeline_test_poly_record" (t : @test.Test) {
 }
 
 ///|
-// NEED_UPDATE
-// test "pipeline_test_lexmatch_first" (t : @test.Test) {
-//  t.run()
-// }
+test "pipeline_test_lexmatch_first" (t : @test.Test) {
+  t.run()
+}
 
 ///|
 test "pipeline_test_string_repr" (t : @test.Test) {
@@ -4529,10 +4472,9 @@ test "pipeline_test_stringview_literal" (t : @test.Test) {
 }
 
 ///|
-// NEED_UPDATE
-// test "pipeline_test_lexmatch_rest_bug" (t : @test.Test) {
-//  t.run()
-// }
+test "pipeline_test_lexmatch_rest_bug" (t : @test.Test) {
+  t.run()
+}
 
 ///|
 test "pipeline_test_empty_record" (t : @test.Test) {
@@ -4550,10 +4492,9 @@ test "parse_test_try_with_parentheses" (t : @test.Test) {
 }
 
 ///|
-// NEED_UPDATE
-// test "pipeline_test_lexmatch_unix_path" (t : @test.Test) {
-//  t.run()
-// }
+test "pipeline_test_lexmatch_unix_path" (t : @test.Test) {
+  t.run()
+}
 
 ///|
 test "pipeline_test_local_newtype_derive" (t : @test.Test) {
@@ -4615,11 +4556,6 @@ test "pipeline_test_share_fnsig" (t : @test.Test) {
   t.run()
 }
 
-///|
-test "parse_test_async_fn" (t : @test.Test) {
-  t.run()
-}
-
 ///|
 test "pipeline_test_local_type" (t : @test.Test) {
   t.run()
@@ -4825,12 +4761,6 @@ test "pipeline_test_noraise" (t : @test.Test) {
   t.run()
 }
 
-///|
-// NEED_UPDATE
-// test "parse_test_fnname_bang" (t : @test.Test) {
-//   t.run()
-// }
-
 ///|
 test "pipeline_test_test_main" (t : @test.Test) {
   t.run()
@@ -4842,23 +4772,17 @@ test "pipeline_test_contify_ty_args" (t : @test.Test) {
 }
 
 ///|
-// NEED_UPDATE
-// test "pipeline_test_match_using_regex" (t : @test.Test) {
-//  t.run()
-// }
-
-///|
-test "pipeline_test_async_for" (t : @test.Test) {
+test "pipeline_test_match_using_regex" (t : @test.Test) {
   t.run()
 }
 
 ///|
-test "pipeline_test_async_misc" (t : @test.Test) {
+test "pipeline_test_async_for" (t : @test.Test) {
   t.run()
 }
 
 ///|
-test "parse_test_text_segment_test" (t : @test.Test) {
+test "pipeline_test_async_misc" (t : @test.Test) {
   t.run()
 }
 
diff --git a/tokens/expect_string.mbt b/tokens/expect_string.mbt
index fb7020d0..151d0c14 100644
--- a/tokens/expect_string.mbt
+++ b/tokens/expect_string.mbt
@@ -116,5 +116,7 @@ pub fn TokenKind::to_expect_string(self : Self) -> String {
     TK_RANGE_INCLUSIVE_REV => ">=.."
     TK_RANGE_LT_INCLUSIVE => "..<="
     TK_WHERE => "where"
+    TK_NOBREAK => "nobreak"
+    TK_PACKAGE => "package"
   }
 }
diff --git a/tokens/pkg.generated.mbti b/tokens/pkg.generated.mbti
index dd3257d1..d68fb45a 100644
--- a/tokens/pkg.generated.mbti
+++ b/tokens/pkg.generated.mbti
@@ -151,11 +151,13 @@ pub(all) enum Token {
   ENUMVIEW
   DECLARE
   NORAISE
+  NOBREAK
   WHERE
   TRY_QUESTION
   TRY_EXCLAMATION
   LEXMATCH
   LEXMATCH_QUESTION
+  PACKAGE
 }
 pub fn Token::kind(Self) -> TokenKind
 pub fn Token::to_expect_string(Self) -> String
@@ -271,11 +273,13 @@ pub(all) enum TokenKind {
   TK_ENUMVIEW
   TK_DECLARE
   TK_NORAISE
+  TK_NOBREAK
   TK_WHERE
   TK_TRY_QUESTION
   TK_TRY_EXCLAMATION
   TK_LEXMATCH
   TK_LEXMATCH_QUESTION
+  TK_PACKAGE
 }
 pub fn TokenKind::to_expect_string(Self) -> String
 pub impl Compare for TokenKind
diff --git a/tokens/token_to_json.mbt b/tokens/token_to_json.mbt
index 3fc8f0a2..6f71d93d 100644
--- a/tokens/token_to_json.mbt
+++ b/tokens/token_to_json.mbt
@@ -142,5 +142,7 @@ pub impl ToJson for Token with to_json(self) {
     RANGE_INCLUSIVE_REV => "RANGE_INCLUSIVE_REV"
     RANGE_LT_INCLUSIVE => "RANGE_LT_INCLUSIVE"
     WHERE => "WHERE"
+    NOBREAK => "NOBREAK"
+    PACKAGE => "PACKAGE"
   }
 }
diff --git a/tokens/tokens.mbt b/tokens/tokens.mbt
index bd2af7b7..86980afa 100644
--- a/tokens/tokens.mbt
+++ b/tokens/tokens.mbt
@@ -108,11 +108,13 @@ pub(all) enum Token {
   ENUMVIEW
   DECLARE
   NORAISE
+  NOBREAK
   WHERE
   TRY_QUESTION
   TRY_EXCLAMATION
   LEXMATCH
   LEXMATCH_QUESTION
+  PACKAGE
 } derive(Show)
 
 ///|
@@ -226,11 +228,13 @@ pub fn Token::kind(self : Token) -> TokenKind {
     ENUMVIEW => TK_ENUMVIEW
     DECLARE => TK_DECLARE
     NORAISE => TK_NORAISE
+    NOBREAK => TK_NOBREAK
     WHERE => TK_WHERE
     TRY_QUESTION => TK_TRY_QUESTION
     TRY_EXCLAMATION => TK_TRY_EXCLAMATION
     LEXMATCH => TK_LEXMATCH
     LEXMATCH_QUESTION => TK_LEXMATCH_QUESTION
+    PACKAGE => TK_PACKAGE
   }
 }
 
@@ -344,11 +348,13 @@ pub(all) enum TokenKind {
   TK_ENUMVIEW
   TK_DECLARE
   TK_NORAISE
+  TK_NOBREAK
   TK_WHERE
   TK_TRY_QUESTION
   TK_TRY_EXCLAMATION
   TK_LEXMATCH
   TK_LEXMATCH_QUESTION
+  TK_PACKAGE
 } derive(Eq, Hash, Compare)
 
 ///|
@@ -463,11 +469,13 @@ pub impl Show for TokenKind with output(self, logger) {
       TK_ENUMVIEW => "\"enumview\""
       TK_DECLARE => "\"declare\""
       TK_NORAISE => "\"noraise\""
+      TK_NOBREAK => "\"nobreak\""
       TK_WHERE => "\"where\""
       TK_TRY_QUESTION => "\"try?\""
       TK_TRY_EXCLAMATION => "\"try!\""
       TK_LEXMATCH => "\"lexmatch\""
       TK_LEXMATCH_QUESTION => "\"lexmatch?\""
+      TK_PACKAGE => "\"package\""
     },
   )
 }
diff --git a/top.mbt b/top.mbt
index b3fa1dd8..c7293322 100644
--- a/top.mbt
+++ b/top.mbt
@@ -75,13 +75,20 @@ fn attach_docstrings(
                 .unwrap_or(@syntax.DocString::empty())
               constr.doc = previous
             })
-          Record(fields) =>
+          Record(fields~, constr_decl~) => {
             fields.each(field => {
               let previous = skip_docstrings_before(field.loc.start)
                 .map(make_doc)
                 .unwrap_or(@syntax.DocString::empty())
               field.doc = previous
             })
+            if constr_decl is Some(constr_decl) {
+              let previous = skip_docstrings_before(constr_decl.loc.start)
+                .map(make_doc)
+                .unwrap_or(@syntax.DocString::empty())
+              constr_decl.doc = previous
+            }
+          }
         }
       }
       TopFuncDef(fun_decl~, ..) => fun_decl.doc = doc
diff --git a/yacc_parser/parser.mbt b/yacc_parser/parser.mbt
index 39ca996d..5525a503 100644
--- a/yacc_parser/parser.mbt
+++ b/yacc_parser/parser.mbt
@@ -615,6 +615,11 @@ priv suberror YYObj__List_FieldPat___Bool_ {
   YYObj__List_FieldPat___Bool_((List[FieldPat], Bool))
 }
 
+///|
+priv suberror YYObj__List_FieldDecl___FunDecl__ {
+  YYObj__List_FieldDecl___FunDecl__((List[FieldDecl], FunDecl?))
+}
+
 ///|
 priv suberror YYObj__List_Statement___Bool_ {
   YYObj__List_Statement___Bool_((List[Statement], Bool))
@@ -857,11 +862,13 @@ priv enum YYSymbol {
   T_ENUMVIEW
   T_DECLARE
   T_NORAISE
+  T_NOBREAK
   T_WHERE
   T_TRY_QUESTION
   T_TRY_EXCLAMATION
   T_LEXMATCH
   T_LEXMATCH_QUESTION
+  T_PACKAGE
   NT_parameter
   NT_parameters
   NT_type_parameters
@@ -972,6 +979,8 @@ priv enum YYSymbol {
   NT_simple_type
   NT_type_
   NT_record_decl_field
+  NT_record_constr_decl
+  NT_record_decl_body
   NT_constructor_param
   NT_enum_constructor
   NT_record_defn
@@ -1038,6 +1047,7 @@ priv enum YYSymbol {
   NT_option_COMMA_
   NT_non_empty_list_commas_array_sub_pattern_
   NT_option_MUTABLE_
+  NT_non_empty_list_semi_rev_aux_record_decl_field_
   NT_non_empty_list_commas_constructor_param_
   NT_option_delimited_LPAREN_non_empty_list_commas_constructor_param__RPAREN__
   NT_option_eq_int_tag_
@@ -1102,7 +1112,7 @@ fn init {
 }
 
 // file:///./parser.mbty
-// 456|    list_semis(structure_item) EOF { $1 }
+// 464|    list_semis(structure_item) EOF { $1 }
 
 ///|
 fn yy_action_0(
@@ -1119,7 +1129,7 @@ fn yy_action_0(
 }
 
 // file:///./parser.mbty
-// 235|    non_empty_list_semis(X) { $1 }
+// 240|    non_empty_list_semis(X) { $1 }
 
 ///|
 fn yy_action_1(
@@ -1136,24 +1146,25 @@ fn yy_action_1(
 }
 
 // file:///./parser.mbty
-// 320|    attributes visibility is_async fun_header_generic option(parameters) func_return_type {
-// 321|    let ((type_name, f), has_error, quants) = $4
-// 322|    let (return_type, error_type) = $6
-// 323|    FunDecl::{
-// 324|      type_name,
-// 325|      name: f,
-// 326|      has_error,
-// 327|      is_async : $3,
-// 328|      quantifiers: quants,
-// 329|      decl_params: $5,
-// 330|      params_loc: mk_loc($loc($5)),
-// 331|      return_type,
-// 332|      error_type,
-// 333|      vis: $2,
-// 334|      doc: DocString::empty(),
-// 335|      attrs: $1,
-// 336|    }
-// 337|  }
+// 325|    attributes visibility is_async fun_header_generic option(parameters) func_return_type {
+// 326|    let ((type_name, f), has_error, quants) = $4
+// 327|    let (return_type, error_type) = $6
+// 328|    FunDecl::{
+// 329|      type_name,
+// 330|      name: f,
+// 331|      has_error,
+// 332|      is_async : $3,
+// 333|      quantifiers: quants,
+// 334|      decl_params: $5,
+// 335|      params_loc: mk_loc($loc($5)),
+// 336|      return_type,
+// 337|      error_type,
+// 338|      vis: $2,
+// 339|      doc: DocString::empty(),
+// 340|      attrs: $1,
+// 341|      loc : mk_loc($loc)
+// 342|    }
+// 343|  }
 
 ///|
 fn yy_action_2(
@@ -1172,6 +1183,12 @@ fn yy_action_2(
   let _end_pos_of_item4 = _args[2].2
   guard _sub_action_1_result is YYObj_Visibility(_dollar2)
   guard _sub_action_0_result is YYObj_List_Attribute_(_dollar1)
+  let _start_pos = if _args.length() == 0 { _last_pos } else { _args[0].1 }
+  let _end_pos = if _args.length() == 0 {
+    _last_pos
+  } else {
+    _args[_args.length() - 1].2
+  }
   YYObj_FunDecl(
     {
       ()
@@ -1190,25 +1207,26 @@ fn yy_action_2(
         vis: _dollar2,
         doc: DocString::empty(),
         attrs: _dollar1,
+        loc: mk_loc((_start_pos, _end_pos)),
       }
     },
   )
 }
 
 // file:///./parser.mbty
-// 765|    attributes is_async "test" option(loced_string) option(parameters) block_expr_with_local_types {
-// 766|    let (local_types, expr) = $6
-// 767|    TopTest(
-// 768|      expr~,
-// 769|      name = $4,
-// 770|      params = $5,
-// 771|      local_types~,
-// 772|      is_async = $2,
-// 773|      loc = mk_loc($sloc),
-// 774|      attrs = $1,
-// 775|      doc = DocString::empty()
-// 776|    )
-// 777|  }
+// 774|    attributes is_async "test" option(loced_string) option(parameters) block_expr_with_local_types {
+// 775|    let (local_types, expr) = $6
+// 776|    TopTest(
+// 777|      expr~,
+// 778|      name = $4,
+// 779|      params = $5,
+// 780|      local_types~,
+// 781|      is_async = $2,
+// 782|      loc = mk_loc($sloc),
+// 783|      attrs = $1,
+// 784|      doc = DocString::empty()
+// 785|    )
+// 786|  }
 
 ///|
 fn yy_action_6(
@@ -1247,24 +1265,25 @@ fn yy_action_6(
 }
 
 // file:///./parser.mbty
-// 320|    attributes visibility is_async fun_header_generic option(parameters) func_return_type {
-// 321|    let ((type_name, f), has_error, quants) = $4
-// 322|    let (return_type, error_type) = $6
-// 323|    FunDecl::{
-// 324|      type_name,
-// 325|      name: f,
-// 326|      has_error,
-// 327|      is_async : $3,
-// 328|      quantifiers: quants,
-// 329|      decl_params: $5,
-// 330|      params_loc: mk_loc($loc($5)),
-// 331|      return_type,
-// 332|      error_type,
-// 333|      vis: $2,
-// 334|      doc: DocString::empty(),
-// 335|      attrs: $1,
-// 336|    }
-// 337|  }
+// 325|    attributes visibility is_async fun_header_generic option(parameters) func_return_type {
+// 326|    let ((type_name, f), has_error, quants) = $4
+// 327|    let (return_type, error_type) = $6
+// 328|    FunDecl::{
+// 329|      type_name,
+// 330|      name: f,
+// 331|      has_error,
+// 332|      is_async : $3,
+// 333|      quantifiers: quants,
+// 334|      decl_params: $5,
+// 335|      params_loc: mk_loc($loc($5)),
+// 336|      return_type,
+// 337|      error_type,
+// 338|      vis: $2,
+// 339|      doc: DocString::empty(),
+// 340|      attrs: $1,
+// 341|      loc : mk_loc($loc)
+// 342|    }
+// 343|  }
 
 ///|
 fn yy_action_7(
@@ -1283,6 +1302,12 @@ fn yy_action_7(
   let _end_pos_of_item4 = _args[1].2
   guard _sub_action_1_result is YYObj_Visibility(_dollar2)
   guard _sub_action_0_result is YYObj_List_Attribute_(_dollar1)
+  let _start_pos = if _args.length() == 0 { _last_pos } else { _args[0].1 }
+  let _end_pos = if _args.length() == 0 {
+    _last_pos
+  } else {
+    _args[_args.length() - 1].2
+  }
   YYObj_FunDecl(
     {
       ()
@@ -1301,30 +1326,32 @@ fn yy_action_7(
         vis: _dollar2,
         doc: DocString::empty(),
         attrs: _dollar1,
+        loc: mk_loc((_start_pos, _end_pos)),
       }
     },
   )
 }
 
 // file:///./parser.mbty
-// 320|    attributes visibility is_async fun_header_generic option(parameters) func_return_type {
-// 321|    let ((type_name, f), has_error, quants) = $4
-// 322|    let (return_type, error_type) = $6
-// 323|    FunDecl::{
-// 324|      type_name,
-// 325|      name: f,
-// 326|      has_error,
-// 327|      is_async : $3,
-// 328|      quantifiers: quants,
-// 329|      decl_params: $5,
-// 330|      params_loc: mk_loc($loc($5)),
-// 331|      return_type,
-// 332|      error_type,
-// 333|      vis: $2,
-// 334|      doc: DocString::empty(),
-// 335|      attrs: $1,
-// 336|    }
-// 337|  }
+// 325|    attributes visibility is_async fun_header_generic option(parameters) func_return_type {
+// 326|    let ((type_name, f), has_error, quants) = $4
+// 327|    let (return_type, error_type) = $6
+// 328|    FunDecl::{
+// 329|      type_name,
+// 330|      name: f,
+// 331|      has_error,
+// 332|      is_async : $3,
+// 333|      quantifiers: quants,
+// 334|      decl_params: $5,
+// 335|      params_loc: mk_loc($loc($5)),
+// 336|      return_type,
+// 337|      error_type,
+// 338|      vis: $2,
+// 339|      doc: DocString::empty(),
+// 340|      attrs: $1,
+// 341|      loc : mk_loc($loc)
+// 342|    }
+// 343|  }
 
 ///|
 fn yy_action_9(
@@ -1343,6 +1370,12 @@ fn yy_action_9(
   let _end_pos_of_item4 = _args[3].2
   guard _sub_action_1_result is YYObj_Visibility(_dollar2)
   guard _sub_action_0_result is YYObj_List_Attribute_(_dollar1)
+  let _start_pos = if _args.length() == 0 { _last_pos } else { _args[0].1 }
+  let _end_pos = if _args.length() == 0 {
+    _last_pos
+  } else {
+    _args[_args.length() - 1].2
+  }
   YYObj_FunDecl(
     {
       ()
@@ -1361,30 +1394,32 @@ fn yy_action_9(
         vis: _dollar2,
         doc: DocString::empty(),
         attrs: _dollar1,
+        loc: mk_loc((_start_pos, _end_pos)),
       }
     },
   )
 }
 
 // file:///./parser.mbty
-// 320|    attributes visibility is_async fun_header_generic option(parameters) func_return_type {
-// 321|    let ((type_name, f), has_error, quants) = $4
-// 322|    let (return_type, error_type) = $6
-// 323|    FunDecl::{
-// 324|      type_name,
-// 325|      name: f,
-// 326|      has_error,
-// 327|      is_async : $3,
-// 328|      quantifiers: quants,
-// 329|      decl_params: $5,
-// 330|      params_loc: mk_loc($loc($5)),
-// 331|      return_type,
-// 332|      error_type,
-// 333|      vis: $2,
-// 334|      doc: DocString::empty(),
-// 335|      attrs: $1,
-// 336|    }
-// 337|  }
+// 325|    attributes visibility is_async fun_header_generic option(parameters) func_return_type {
+// 326|    let ((type_name, f), has_error, quants) = $4
+// 327|    let (return_type, error_type) = $6
+// 328|    FunDecl::{
+// 329|      type_name,
+// 330|      name: f,
+// 331|      has_error,
+// 332|      is_async : $3,
+// 333|      quantifiers: quants,
+// 334|      decl_params: $5,
+// 335|      params_loc: mk_loc($loc($5)),
+// 336|      return_type,
+// 337|      error_type,
+// 338|      vis: $2,
+// 339|      doc: DocString::empty(),
+// 340|      attrs: $1,
+// 341|      loc : mk_loc($loc)
+// 342|    }
+// 343|  }
 
 ///|
 fn yy_action_11(
@@ -1403,6 +1438,12 @@ fn yy_action_11(
   let _end_pos_of_item4 = _args[2].2
   guard _sub_action_1_result is YYObj_Visibility(_dollar2)
   guard _sub_action_0_result is YYObj_List_Attribute_(_dollar1)
+  let _start_pos = if _args.length() == 0 { _last_pos } else { _args[0].1 }
+  let _end_pos = if _args.length() == 0 {
+    _last_pos
+  } else {
+    _args[_args.length() - 1].2
+  }
   YYObj_FunDecl(
     {
       ()
@@ -1421,31 +1462,33 @@ fn yy_action_11(
         vis: _dollar2,
         doc: DocString::empty(),
         attrs: _dollar1,
+        loc: mk_loc((_start_pos, _end_pos)),
       }
     },
   )
 }
 
 // file:///./parser.mbty
-// 401|    attributes visibility "extern" STRING "fn" fun_binder optional_bang optional_type_parameters option(parameters) func_return_type {
-// 402|    let (type_name, f) = $6
-// 403|    let (return_type, error_type) = $10
-// 404|    let fn_decl = FunDecl::{
-// 405|      type_name,
-// 406|      name: f,
-// 407|      has_error : $7,
-// 408|      is_async : None,
-// 409|      quantifiers: $8,
-// 410|      decl_params: $9,
-// 411|      params_loc: mk_loc($loc($9)),
-// 412|      return_type,
-// 413|      error_type,
-// 414|      vis: $2,
-// 415|      doc: DocString::empty(),
-// 416|      attrs: $1,
-// 417|    }
-// 418|    ($4, fn_decl)
-// 419|  }
+// 408|    attributes visibility "extern" STRING "fn" fun_binder optional_bang optional_type_parameters option(parameters) func_return_type {
+// 409|    let (type_name, f) = $6
+// 410|    let (return_type, error_type) = $10
+// 411|    let fn_decl = FunDecl::{
+// 412|      type_name,
+// 413|      name: f,
+// 414|      has_error : $7,
+// 415|      is_async : None,
+// 416|      quantifiers: $8,
+// 417|      decl_params: $9,
+// 418|      params_loc: mk_loc($loc($9)),
+// 419|      return_type,
+// 420|      error_type,
+// 421|      vis: $2,
+// 422|      doc: DocString::empty(),
+// 423|      attrs: $1,
+// 424|      loc : mk_loc($loc)
+// 425|    }
+// 426|    ($4, fn_decl)
+// 427|  }
 
 ///|
 fn yy_action_12(
@@ -1463,6 +1506,12 @@ fn yy_action_12(
   let _end_pos_of_item8 = _args[7].2
   guard _sub_action_1_result is YYObj_Visibility(_dollar2)
   guard _sub_action_0_result is YYObj_List_Attribute_(_dollar1)
+  let _start_pos = if _args.length() == 0 { _last_pos } else { _args[0].1 }
+  let _end_pos = if _args.length() == 0 {
+    _last_pos
+  } else {
+    _args[_args.length() - 1].2
+  }
   guard _args[2].0 is YYObj_StringLiteral(_dollar4)
   YYObj__StringLiteral__FunDecl_(
     {
@@ -1482,6 +1531,7 @@ fn yy_action_12(
         vis: _dollar2,
         doc: DocString::empty(),
         attrs: _dollar1,
+        loc: mk_loc((_start_pos, _end_pos)),
       }
       (_dollar4, fn_decl)
     },
@@ -1489,22 +1539,22 @@ fn yy_action_12(
 }
 
 // file:///./parser.mbty
-// 477|    attributes visibility "extern" "type" UIDENT optional_type_parameters_no_constraints deriving_directive_list {
-// 478|    TopTypeDef(
-// 479|      TypeDecl::{
-// 480|        tycon : $5,
-// 481|        tycon_loc : mk_loc($loc($5)),
-// 482|        params : $6,
-// 483|        components: Extern,
-// 484|        type_vis : $2,
-// 485|        doc : DocString::empty(),
-// 486|        deriving: $7,
-// 487|        loc : mk_loc($sloc),
-// 488|        attrs : $1,
-// 489|        is_declare : false
-// 490|      }
-// 491|    )
-// 492|  }
+// 485|    attributes visibility "extern" "type" UIDENT optional_type_parameters_no_constraints deriving_directive_list {
+// 486|    TopTypeDef(
+// 487|      TypeDecl::{
+// 488|        tycon : $5,
+// 489|        tycon_loc : mk_loc($loc($5)),
+// 490|        params : $6,
+// 491|        components: Extern,
+// 492|        type_vis : $2,
+// 493|        doc : DocString::empty(),
+// 494|        deriving: $7,
+// 495|        loc : mk_loc($sloc),
+// 496|        attrs : $1,
+// 497|        is_declare : false
+// 498|      }
+// 499|    )
+// 500|  }
 
 ///|
 fn yy_action_13(
@@ -1546,7 +1596,7 @@ fn yy_action_13(
 }
 
 // file:///./parser.mbty
-// 451|    attributes is_declare visibility "let" binder opt_annot { ($1, false, $2, $3, $5, $6) }
+// 459|    attributes is_declare visibility "let" binder opt_annot { ($1, false, $2, $3, $5, $6) }
 
 ///|
 fn yy_action_14(
@@ -1572,7 +1622,7 @@ fn yy_action_14(
 }
 
 // file:///./parser.mbty
-// 451|    attributes is_declare visibility "let" binder opt_annot { ($1, false, $2, $3, $5, $6) }
+// 459|    attributes is_declare visibility "let" binder opt_annot { ($1, false, $2, $3, $5, $6) }
 
 ///|
 fn yy_action_18(
@@ -1598,7 +1648,7 @@ fn yy_action_18(
 }
 
 // file:///./parser.mbty
-// 452|    attributes is_declare visibility "const" UIDENT opt_annot { ($1, true, $2, $3, Binder::{ name : $5, loc : mk_loc($loc($5)) }, $6) }
+// 460|    attributes is_declare visibility "const" UIDENT opt_annot { ($1, true, $2, $3, Binder::{ name : $5, loc : mk_loc($loc($5)) }, $6) }
 
 ///|
 fn yy_action_20(
@@ -1635,7 +1685,7 @@ fn yy_action_20(
 }
 
 // file:///./parser.mbty
-// 452|    attributes is_declare visibility "const" UIDENT opt_annot { ($1, true, $2, $3, Binder::{ name : $5, loc : mk_loc($loc($5)) }, $6) }
+// 460|    attributes is_declare visibility "const" UIDENT opt_annot { ($1, true, $2, $3, Binder::{ name : $5, loc : mk_loc($loc($5)) }, $6) }
 
 ///|
 fn yy_action_21(
@@ -1672,19 +1722,19 @@ fn yy_action_21(
 }
 
 // file:///./parser.mbty
-// 676|    attributes visibility "fnalias" func_alias_targets {
-// 677|    let (pkg, type_name, is_list, targets) = $4
-// 678|    TopFuncAlias(
-// 679|      pkg~,
-// 680|      type_name~,
-// 681|      targets~,
-// 682|      vis = $2,
-// 683|      attrs = $1,
-// 684|      is_list~,
-// 685|      doc = DocString::empty(),
-// 686|      loc = mk_loc($sloc)
-// 687|    )
-// 688|  }
+// 685|    attributes visibility "fnalias" func_alias_targets {
+// 686|    let (pkg, type_name, is_list, targets) = $4
+// 687|    TopFuncAlias(
+// 688|      pkg~,
+// 689|      type_name~,
+// 690|      targets~,
+// 691|      vis = $2,
+// 692|      attrs = $1,
+// 693|      is_list~,
+// 694|      doc = DocString::empty(),
+// 695|      loc = mk_loc($sloc)
+// 696|    )
+// 697|  }
 
 ///|
 fn yy_action_22(
@@ -1721,25 +1771,25 @@ fn yy_action_22(
 }
 
 // file:///./parser.mbty
-// 689|    attributes is_declare visibility "trait" UIDENT option(preceded(COLON, separated_nonempty_list(PLUS, tvar_constraint))) "{" list_semis(trait_method_decl) "}" {
-// 690|    let name = Binder::{ name: $5, loc: mk_loc($loc($4)) }
-// 691|    let supers = match $6 {
-// 692|      None => @list.empty()
-// 693|      Some(supers) => supers
-// 694|    }
-// 695|    TopTrait(
-// 696|      TraitDecl::{
-// 697|        name,
-// 698|        supers,
-// 699|        methods: $8,
-// 700|        vis: $3,
-// 701|        loc: mk_loc($sloc),
-// 702|        attrs: $1,
-// 703|        doc : DocString::empty(),
-// 704|        is_declare : $2
-// 705|      }
-// 706|    )
-// 707|  }
+// 698|    attributes is_declare visibility "trait" UIDENT option(preceded(COLON, separated_nonempty_list(PLUS, tvar_constraint))) "{" list_semis(trait_method_decl) "}" {
+// 699|    let name = Binder::{ name: $5, loc: mk_loc($loc($4)) }
+// 700|    let supers = match $6 {
+// 701|      None => @list.empty()
+// 702|      Some(supers) => supers
+// 703|    }
+// 704|    TopTrait(
+// 705|      TraitDecl::{
+// 706|        name,
+// 707|        supers,
+// 708|        methods: $8,
+// 709|        vis: $3,
+// 710|        loc: mk_loc($sloc),
+// 711|        attrs: $1,
+// 712|        doc : DocString::empty(),
+// 713|        is_declare : $2
+// 714|      }
+// 715|    )
+// 716|  }
 
 ///|
 fn yy_action_23(
@@ -1789,18 +1839,18 @@ fn yy_action_23(
 }
 
 // file:///./parser.mbty
-// 708|    attributes visibility "typealias" batch_type_alias_targets {
-// 709|    let (is_list, pkg, targets) = $4
-// 710|    TopBatchTypeAlias(
-// 711|      pkg~,
-// 712|      targets~,
-// 713|      vis = $2,
-// 714|      attrs = $1,
-// 715|      is_list~,
-// 716|      doc = DocString::empty(),
-// 717|      loc = mk_loc($sloc)
-// 718|    )
-// 719|  }
+// 717|    attributes visibility "typealias" batch_type_alias_targets {
+// 718|    let (is_list, pkg, targets) = $4
+// 719|    TopBatchTypeAlias(
+// 720|      pkg~,
+// 721|      targets~,
+// 722|      vis = $2,
+// 723|      attrs = $1,
+// 724|      is_list~,
+// 725|      doc = DocString::empty(),
+// 726|      loc = mk_loc($sloc)
+// 727|    )
+// 728|  }
 
 ///|
 fn yy_action_24(
@@ -1836,22 +1886,22 @@ fn yy_action_24(
 }
 
 // file:///./parser.mbty
-// 720|    attributes visibility "typealias" type_ "as" UIDENT optional_type_parameters_no_constraints {
-// 721|    TopTypeDef(
-// 722|      TypeDecl::{
-// 723|        tycon : $6,
-// 724|        tycon_loc : mk_loc($loc($6)),
-// 725|        params : $7,
-// 726|        components: Alias($4),
-// 727|        type_vis : $2,
-// 728|        doc : DocString::empty(),
-// 729|        deriving: @list.empty(),
-// 730|        loc : mk_loc($sloc),
-// 731|        attrs : $1,
-// 732|        is_declare : false
-// 733|      }
-// 734|    )
-// 735|  }
+// 729|    attributes visibility "typealias" type_ "as" UIDENT optional_type_parameters_no_constraints {
+// 730|    TopTypeDef(
+// 731|      TypeDecl::{
+// 732|        tycon : $6,
+// 733|        tycon_loc : mk_loc($loc($6)),
+// 734|        params : $7,
+// 735|        components: Alias($4),
+// 736|        type_vis : $2,
+// 737|        doc : DocString::empty(),
+// 738|        deriving: @list.empty(),
+// 739|        loc : mk_loc($sloc),
+// 740|        attrs : $1,
+// 741|        is_declare : false
+// 742|      }
+// 743|    )
+// 744|  }
 
 ///|
 fn yy_action_25(
@@ -1893,18 +1943,18 @@ fn yy_action_25(
 }
 
 // file:///./parser.mbty
-// 753|    attributes visibility "traitalias" batch_type_alias_targets {
-// 754|    let (is_list, pkg, targets) = $4
-// 755|    TopBatchTraitAlias(
-// 756|      pkg~,
-// 757|      targets~,
-// 758|      vis = $2,
-// 759|      attrs = $1,
-// 760|      is_list~,
-// 761|      doc = DocString::empty(),
-// 762|      loc = mk_loc($sloc)
-// 763|    )
-// 764|  }
+// 762|    attributes visibility "traitalias" batch_type_alias_targets {
+// 763|    let (is_list, pkg, targets) = $4
+// 764|    TopBatchTraitAlias(
+// 765|      pkg~,
+// 766|      targets~,
+// 767|      vis = $2,
+// 768|      attrs = $1,
+// 769|      is_list~,
+// 770|      doc = DocString::empty(),
+// 771|      loc = mk_loc($sloc)
+// 772|    )
+// 773|  }
 
 ///|
 fn yy_action_26(
@@ -1940,24 +1990,24 @@ fn yy_action_26(
 }
 
 // file:///./parser.mbty
-// 778|    attributes visibility "impl" optional_type_parameters type_name "for" type_ "with" binder optional_bang parameters func_return_type impl_body {
-// 779|    let (ret_ty, err_ty) = $12
-// 780|    TopImpl(
-// 781|      self_ty = Some($7),
-// 782|      trait_ = $5,
-// 783|      method_name = $9,
-// 784|      has_error = $10,
-// 785|      quantifiers = $4,
-// 786|      params = $11,
-// 787|      ret_ty~,
-// 788|      err_ty~,
-// 789|      body = $13,
-// 790|      vis = $2,
-// 791|      loc = mk_loc($sloc),
-// 792|      attrs = $1,
-// 793|      doc = DocString::empty()
-// 794|    )
-// 795|  }
+// 787|    attributes visibility "impl" optional_type_parameters type_name "for" type_ "with" binder optional_bang parameters func_return_type impl_body {
+// 788|    let (ret_ty, err_ty) = $12
+// 789|    TopImpl(
+// 790|      self_ty = Some($7),
+// 791|      trait_ = $5,
+// 792|      method_name = $9,
+// 793|      has_error = $10,
+// 794|      quantifiers = $4,
+// 795|      params = $11,
+// 796|      ret_ty~,
+// 797|      err_ty~,
+// 798|      body = $13,
+// 799|      vis = $2,
+// 800|      loc = mk_loc($sloc),
+// 801|      attrs = $1,
+// 802|      doc = DocString::empty()
+// 803|    )
+// 804|  }
 
 ///|
 fn yy_action_27(
@@ -2007,18 +2057,18 @@ fn yy_action_27(
 }
 
 // file:///./parser.mbty
-// 814|    attributes is_declare visibility "impl" optional_type_parameters type_name "for" type_ {
-// 815|    TopImplRelation(
-// 816|      self_ty = $8,
-// 817|      trait_ = $6,
-// 818|      quantifiers = $5,
-// 819|      vis = $3,
-// 820|      attrs = $1,
-// 821|      loc = mk_loc($sloc),
-// 822|      doc = DocString::empty(),
-// 823|      is_declare = $2
-// 824|    )
-// 825|  }
+// 823|    attributes is_declare visibility "impl" optional_type_parameters type_name "for" type_ {
+// 824|    TopImplRelation(
+// 825|      self_ty = $8,
+// 826|      trait_ = $6,
+// 827|      quantifiers = $5,
+// 828|      vis = $3,
+// 829|      attrs = $1,
+// 830|      loc = mk_loc($sloc),
+// 831|      doc = DocString::empty(),
+// 832|      is_declare = $2
+// 833|    )
+// 834|  }
 
 ///|
 fn yy_action_28(
@@ -2058,24 +2108,24 @@ fn yy_action_28(
 }
 
 // file:///./parser.mbty
-// 796|    attributes visibility "impl" optional_type_parameters type_name "with" binder optional_bang parameters func_return_type impl_body {
-// 797|    let (ret_ty, err_ty) = $10
-// 798|    TopImpl(
-// 799|      self_ty = None,
-// 800|      trait_ = $5,
-// 801|      method_name = $7,
-// 802|      has_error = $8,
-// 803|      quantifiers = $4,
-// 804|      params = $9,
-// 805|      ret_ty~,
-// 806|      err_ty~,
-// 807|      body = $11,
-// 808|      vis = $2,
-// 809|      loc = mk_loc($sloc),
-// 810|      attrs = $1,
-// 811|      doc = DocString::empty()
-// 812|    )
-// 813|  }
+// 805|    attributes visibility "impl" optional_type_parameters type_name "with" binder optional_bang parameters func_return_type impl_body {
+// 806|    let (ret_ty, err_ty) = $10
+// 807|    TopImpl(
+// 808|      self_ty = None,
+// 809|      trait_ = $5,
+// 810|      method_name = $7,
+// 811|      has_error = $8,
+// 812|      quantifiers = $4,
+// 813|      params = $9,
+// 814|      ret_ty~,
+// 815|      err_ty~,
+// 816|      body = $11,
+// 817|      vis = $2,
+// 818|      loc = mk_loc($sloc),
+// 819|      attrs = $1,
+// 820|      doc = DocString::empty()
+// 821|    )
+// 822|  }
 
 ///|
 fn yy_action_29(
@@ -2124,23 +2174,23 @@ fn yy_action_29(
 }
 
 // file:///./parser.mbty
-// 826|    attributes visibility "enumview" optional_type_parameters UIDENT "{" list_semis(enum_constructor) "}" "for" type_ "with" binder parameters block_expr {
-// 827|    TopView(
-// 828|      quantifiers = $4,
-// 829|      source_ty = $10,
-// 830|      view_type_name = $5,
-// 831|      view_type_loc = mk_loc($loc($5)),
-// 832|      view_func_name = $12,
-// 833|      parameters = $13,
-// 834|      params_loc = mk_loc($loc($13)),
-// 835|      view_constrs = $7,
-// 836|      body = $14,
-// 837|      vis = $2,
-// 838|      loc = mk_loc($sloc),
-// 839|      attrs = $1,
-// 840|      doc = DocString::empty()
-// 841|    )
-// 842|  }
+// 835|    attributes visibility "enumview" optional_type_parameters UIDENT "{" list_semis(enum_constructor) "}" "for" type_ "with" binder parameters block_expr {
+// 836|    TopView(
+// 837|      quantifiers = $4,
+// 838|      source_ty = $10,
+// 839|      view_type_name = $5,
+// 840|      view_type_loc = mk_loc($loc($5)),
+// 841|      view_func_name = $12,
+// 842|      parameters = $13,
+// 843|      params_loc = mk_loc($loc($13)),
+// 844|      view_constrs = $7,
+// 845|      body = $14,
+// 846|      vis = $2,
+// 847|      loc = mk_loc($sloc),
+// 848|      attrs = $1,
+// 849|      doc = DocString::empty()
+// 850|    )
+// 851|  }
 
 ///|
 fn yy_action_30(
@@ -2192,19 +2242,19 @@ fn yy_action_30(
 }
 
 // file:///./parser.mbty
-// 843|    attributes visibility "using" PACKAGE_NAME "{" list_commas(using_binder) "}" {
-// 844|    TopUsing(
-// 845|      pkg = {
-// 846|        name : $4,
-// 847|        loc : mk_loc($loc($4))
-// 848|      },
-// 849|      names = $6,
-// 850|      vis = $2,
-// 851|      attrs = $1,
-// 852|      loc = mk_loc($loc),
-// 853|      doc = DocString::empty()
-// 854|    )
-// 855|  }
+// 852|    attributes visibility "using" PACKAGE_NAME "{" list_commas(using_binder) "}" {
+// 853|    TopUsing(
+// 854|      pkg = {
+// 855|        name : $4,
+// 856|        loc : mk_loc($loc($4))
+// 857|      },
+// 858|      names = $6,
+// 859|      vis = $2,
+// 860|      attrs = $1,
+// 861|      loc = mk_loc($loc),
+// 862|      doc = DocString::empty()
+// 863|    )
+// 864|  }
 
 ///|
 fn yy_action_31(
@@ -2244,9 +2294,9 @@ fn yy_action_31(
 }
 
 // file:///./parser.mbty
-// 884|    attributes is_declare visibility "type" UIDENT optional_type_parameters_no_constraints { 
-// 885|    ($1, $3, $2, $5, mk_loc($loc($5)), $6) 
-// 886|  }
+// 893|    attributes is_declare visibility "type" UIDENT optional_type_parameters_no_constraints { 
+// 894|    ($1, $3, $2, $5, mk_loc($loc($5)), $6) 
+// 895|  }
 
 ///|
 fn yy_action_32(
@@ -2279,7 +2329,7 @@ fn yy_action_32(
 }
 
 // file:///./parser.mbty
-// 890|    attributes is_declare visibility "suberror" UIDENT { ($1, $3, $2, $5, mk_loc($loc($5))) }
+// 899|    attributes is_declare visibility "suberror" UIDENT { ($1, $3, $2, $5, mk_loc($loc($5))) }
 
 ///|
 fn yy_action_33(
@@ -2310,9 +2360,9 @@ fn yy_action_33(
 }
 
 // file:///./parser.mbty
-// 894|    attributes visibility "struct" UIDENT optional_type_parameters_no_constraints { 
-// 895|    ($1, $2, $4, mk_loc($loc($4)), $5) 
-// 896|  }
+// 903|    attributes visibility "struct" UIDENT optional_type_parameters_no_constraints { 
+// 904|    ($1, $2, $4, mk_loc($loc($4)), $5) 
+// 905|  }
 
 ///|
 fn yy_action_34(
@@ -2342,9 +2392,9 @@ fn yy_action_34(
 }
 
 // file:///./parser.mbty
-// 900|    attributes visibility "enum" UIDENT optional_type_parameters_no_constraints { 
-// 901|    ($1, $2, $4, mk_loc($loc($4)), $5) 
-// 902|  }
+// 909|    attributes visibility "enum" UIDENT optional_type_parameters_no_constraints { 
+// 910|    ($1, $2, $4, mk_loc($loc($4)), $5) 
+// 911|  }
 
 ///|
 fn yy_action_35(
@@ -2374,24 +2424,25 @@ fn yy_action_35(
 }
 
 // file:///./parser.mbty
-// 320|    attributes visibility is_async fun_header_generic option(parameters) func_return_type {
-// 321|    let ((type_name, f), has_error, quants) = $4
-// 322|    let (return_type, error_type) = $6
-// 323|    FunDecl::{
-// 324|      type_name,
-// 325|      name: f,
-// 326|      has_error,
-// 327|      is_async : $3,
-// 328|      quantifiers: quants,
-// 329|      decl_params: $5,
-// 330|      params_loc: mk_loc($loc($5)),
-// 331|      return_type,
-// 332|      error_type,
-// 333|      vis: $2,
-// 334|      doc: DocString::empty(),
-// 335|      attrs: $1,
-// 336|    }
-// 337|  }
+// 325|    attributes visibility is_async fun_header_generic option(parameters) func_return_type {
+// 326|    let ((type_name, f), has_error, quants) = $4
+// 327|    let (return_type, error_type) = $6
+// 328|    FunDecl::{
+// 329|      type_name,
+// 330|      name: f,
+// 331|      has_error,
+// 332|      is_async : $3,
+// 333|      quantifiers: quants,
+// 334|      decl_params: $5,
+// 335|      params_loc: mk_loc($loc($5)),
+// 336|      return_type,
+// 337|      error_type,
+// 338|      vis: $2,
+// 339|      doc: DocString::empty(),
+// 340|      attrs: $1,
+// 341|      loc : mk_loc($loc)
+// 342|    }
+// 343|  }
 
 ///|
 fn yy_action_36(
@@ -2410,6 +2461,12 @@ fn yy_action_36(
   let _end_pos_of_item4 = _args[4].2
   guard _sub_action_1_result is YYObj_Visibility(_dollar2)
   guard _sub_action_0_result is YYObj_List_Attribute_(_dollar1)
+  let _start_pos = if _args.length() == 0 { _last_pos } else { _args[0].1 }
+  let _end_pos = if _args.length() == 0 {
+    _last_pos
+  } else {
+    _args[_args.length() - 1].2
+  }
   YYObj_FunDecl(
     {
       ()
@@ -2428,30 +2485,32 @@ fn yy_action_36(
         vis: _dollar2,
         doc: DocString::empty(),
         attrs: _dollar1,
+        loc: mk_loc((_start_pos, _end_pos)),
       }
     },
   )
 }
 
 // file:///./parser.mbty
-// 320|    attributes visibility is_async fun_header_generic option(parameters) func_return_type {
-// 321|    let ((type_name, f), has_error, quants) = $4
-// 322|    let (return_type, error_type) = $6
-// 323|    FunDecl::{
-// 324|      type_name,
-// 325|      name: f,
-// 326|      has_error,
-// 327|      is_async : $3,
-// 328|      quantifiers: quants,
-// 329|      decl_params: $5,
-// 330|      params_loc: mk_loc($loc($5)),
-// 331|      return_type,
-// 332|      error_type,
-// 333|      vis: $2,
-// 334|      doc: DocString::empty(),
-// 335|      attrs: $1,
-// 336|    }
-// 337|  }
+// 325|    attributes visibility is_async fun_header_generic option(parameters) func_return_type {
+// 326|    let ((type_name, f), has_error, quants) = $4
+// 327|    let (return_type, error_type) = $6
+// 328|    FunDecl::{
+// 329|      type_name,
+// 330|      name: f,
+// 331|      has_error,
+// 332|      is_async : $3,
+// 333|      quantifiers: quants,
+// 334|      decl_params: $5,
+// 335|      params_loc: mk_loc($loc($5)),
+// 336|      return_type,
+// 337|      error_type,
+// 338|      vis: $2,
+// 339|      doc: DocString::empty(),
+// 340|      attrs: $1,
+// 341|      loc : mk_loc($loc)
+// 342|    }
+// 343|  }
 
 ///|
 fn yy_action_38(
@@ -2470,6 +2529,12 @@ fn yy_action_38(
   let _end_pos_of_item4 = _args[3].2
   guard _sub_action_1_result is YYObj_Visibility(_dollar2)
   guard _sub_action_0_result is YYObj_List_Attribute_(_dollar1)
+  let _start_pos = if _args.length() == 0 { _last_pos } else { _args[0].1 }
+  let _end_pos = if _args.length() == 0 {
+    _last_pos
+  } else {
+    _args[_args.length() - 1].2
+  }
   YYObj_FunDecl(
     {
       ()
@@ -2488,31 +2553,33 @@ fn yy_action_38(
         vis: _dollar2,
         doc: DocString::empty(),
         attrs: _dollar1,
+        loc: mk_loc((_start_pos, _end_pos)),
       }
     },
   )
 }
 
 // file:///./parser.mbty
-// 401|    attributes visibility "extern" STRING "fn" fun_binder optional_bang optional_type_parameters option(parameters) func_return_type {
-// 402|    let (type_name, f) = $6
-// 403|    let (return_type, error_type) = $10
-// 404|    let fn_decl = FunDecl::{
-// 405|      type_name,
-// 406|      name: f,
-// 407|      has_error : $7,
-// 408|      is_async : None,
-// 409|      quantifiers: $8,
-// 410|      decl_params: $9,
-// 411|      params_loc: mk_loc($loc($9)),
-// 412|      return_type,
-// 413|      error_type,
-// 414|      vis: $2,
-// 415|      doc: DocString::empty(),
-// 416|      attrs: $1,
-// 417|    }
-// 418|    ($4, fn_decl)
-// 419|  }
+// 408|    attributes visibility "extern" STRING "fn" fun_binder optional_bang optional_type_parameters option(parameters) func_return_type {
+// 409|    let (type_name, f) = $6
+// 410|    let (return_type, error_type) = $10
+// 411|    let fn_decl = FunDecl::{
+// 412|      type_name,
+// 413|      name: f,
+// 414|      has_error : $7,
+// 415|      is_async : None,
+// 416|      quantifiers: $8,
+// 417|      decl_params: $9,
+// 418|      params_loc: mk_loc($loc($9)),
+// 419|      return_type,
+// 420|      error_type,
+// 421|      vis: $2,
+// 422|      doc: DocString::empty(),
+// 423|      attrs: $1,
+// 424|      loc : mk_loc($loc)
+// 425|    }
+// 426|    ($4, fn_decl)
+// 427|  }
 
 ///|
 fn yy_action_39(
@@ -2530,6 +2597,12 @@ fn yy_action_39(
   let _end_pos_of_item8 = _args[8].2
   guard _sub_action_1_result is YYObj_Visibility(_dollar2)
   guard _sub_action_0_result is YYObj_List_Attribute_(_dollar1)
+  let _start_pos = if _args.length() == 0 { _last_pos } else { _args[0].1 }
+  let _end_pos = if _args.length() == 0 {
+    _last_pos
+  } else {
+    _args[_args.length() - 1].2
+  }
   guard _args[3].0 is YYObj_StringLiteral(_dollar4)
   YYObj__StringLiteral__FunDecl_(
     {
@@ -2549,6 +2622,7 @@ fn yy_action_39(
         vis: _dollar2,
         doc: DocString::empty(),
         attrs: _dollar1,
+        loc: mk_loc((_start_pos, _end_pos)),
       }
       (_dollar4, fn_decl)
     },
@@ -2556,22 +2630,22 @@ fn yy_action_39(
 }
 
 // file:///./parser.mbty
-// 477|    attributes visibility "extern" "type" UIDENT optional_type_parameters_no_constraints deriving_directive_list {
-// 478|    TopTypeDef(
-// 479|      TypeDecl::{
-// 480|        tycon : $5,
-// 481|        tycon_loc : mk_loc($loc($5)),
-// 482|        params : $6,
-// 483|        components: Extern,
-// 484|        type_vis : $2,
-// 485|        doc : DocString::empty(),
-// 486|        deriving: $7,
-// 487|        loc : mk_loc($sloc),
-// 488|        attrs : $1,
-// 489|        is_declare : false
-// 490|      }
-// 491|    )
-// 492|  }
+// 485|    attributes visibility "extern" "type" UIDENT optional_type_parameters_no_constraints deriving_directive_list {
+// 486|    TopTypeDef(
+// 487|      TypeDecl::{
+// 488|        tycon : $5,
+// 489|        tycon_loc : mk_loc($loc($5)),
+// 490|        params : $6,
+// 491|        components: Extern,
+// 492|        type_vis : $2,
+// 493|        doc : DocString::empty(),
+// 494|        deriving: $7,
+// 495|        loc : mk_loc($sloc),
+// 496|        attrs : $1,
+// 497|        is_declare : false
+// 498|      }
+// 499|    )
+// 500|  }
 
 ///|
 fn yy_action_40(
@@ -2613,7 +2687,7 @@ fn yy_action_40(
 }
 
 // file:///./parser.mbty
-// 451|    attributes is_declare visibility "let" binder opt_annot { ($1, false, $2, $3, $5, $6) }
+// 459|    attributes is_declare visibility "let" binder opt_annot { ($1, false, $2, $3, $5, $6) }
 
 ///|
 fn yy_action_41(
@@ -2639,7 +2713,7 @@ fn yy_action_41(
 }
 
 // file:///./parser.mbty
-// 451|    attributes is_declare visibility "let" binder opt_annot { ($1, false, $2, $3, $5, $6) }
+// 459|    attributes is_declare visibility "let" binder opt_annot { ($1, false, $2, $3, $5, $6) }
 
 ///|
 fn yy_action_42(
@@ -2665,7 +2739,7 @@ fn yy_action_42(
 }
 
 // file:///./parser.mbty
-// 452|    attributes is_declare visibility "const" UIDENT opt_annot { ($1, true, $2, $3, Binder::{ name : $5, loc : mk_loc($loc($5)) }, $6) }
+// 460|    attributes is_declare visibility "const" UIDENT opt_annot { ($1, true, $2, $3, Binder::{ name : $5, loc : mk_loc($loc($5)) }, $6) }
 
 ///|
 fn yy_action_43(
@@ -2702,7 +2776,7 @@ fn yy_action_43(
 }
 
 // file:///./parser.mbty
-// 452|    attributes is_declare visibility "const" UIDENT opt_annot { ($1, true, $2, $3, Binder::{ name : $5, loc : mk_loc($loc($5)) }, $6) }
+// 460|    attributes is_declare visibility "const" UIDENT opt_annot { ($1, true, $2, $3, Binder::{ name : $5, loc : mk_loc($loc($5)) }, $6) }
 
 ///|
 fn yy_action_44(
@@ -2739,19 +2813,19 @@ fn yy_action_44(
 }
 
 // file:///./parser.mbty
-// 676|    attributes visibility "fnalias" func_alias_targets {
-// 677|    let (pkg, type_name, is_list, targets) = $4
-// 678|    TopFuncAlias(
-// 679|      pkg~,
-// 680|      type_name~,
-// 681|      targets~,
-// 682|      vis = $2,
-// 683|      attrs = $1,
-// 684|      is_list~,
-// 685|      doc = DocString::empty(),
-// 686|      loc = mk_loc($sloc)
-// 687|    )
-// 688|  }
+// 685|    attributes visibility "fnalias" func_alias_targets {
+// 686|    let (pkg, type_name, is_list, targets) = $4
+// 687|    TopFuncAlias(
+// 688|      pkg~,
+// 689|      type_name~,
+// 690|      targets~,
+// 691|      vis = $2,
+// 692|      attrs = $1,
+// 693|      is_list~,
+// 694|      doc = DocString::empty(),
+// 695|      loc = mk_loc($sloc)
+// 696|    )
+// 697|  }
 
 ///|
 fn yy_action_45(
@@ -2788,25 +2862,25 @@ fn yy_action_45(
 }
 
 // file:///./parser.mbty
-// 689|    attributes is_declare visibility "trait" UIDENT option(preceded(COLON, separated_nonempty_list(PLUS, tvar_constraint))) "{" list_semis(trait_method_decl) "}" {
-// 690|    let name = Binder::{ name: $5, loc: mk_loc($loc($4)) }
-// 691|    let supers = match $6 {
-// 692|      None => @list.empty()
-// 693|      Some(supers) => supers
-// 694|    }
-// 695|    TopTrait(
-// 696|      TraitDecl::{
-// 697|        name,
-// 698|        supers,
-// 699|        methods: $8,
-// 700|        vis: $3,
-// 701|        loc: mk_loc($sloc),
-// 702|        attrs: $1,
-// 703|        doc : DocString::empty(),
-// 704|        is_declare : $2
-// 705|      }
-// 706|    )
-// 707|  }
+// 698|    attributes is_declare visibility "trait" UIDENT option(preceded(COLON, separated_nonempty_list(PLUS, tvar_constraint))) "{" list_semis(trait_method_decl) "}" {
+// 699|    let name = Binder::{ name: $5, loc: mk_loc($loc($4)) }
+// 700|    let supers = match $6 {
+// 701|      None => @list.empty()
+// 702|      Some(supers) => supers
+// 703|    }
+// 704|    TopTrait(
+// 705|      TraitDecl::{
+// 706|        name,
+// 707|        supers,
+// 708|        methods: $8,
+// 709|        vis: $3,
+// 710|        loc: mk_loc($sloc),
+// 711|        attrs: $1,
+// 712|        doc : DocString::empty(),
+// 713|        is_declare : $2
+// 714|      }
+// 715|    )
+// 716|  }
 
 ///|
 fn yy_action_46(
@@ -2856,18 +2930,18 @@ fn yy_action_46(
 }
 
 // file:///./parser.mbty
-// 708|    attributes visibility "typealias" batch_type_alias_targets {
-// 709|    let (is_list, pkg, targets) = $4
-// 710|    TopBatchTypeAlias(
-// 711|      pkg~,
-// 712|      targets~,
-// 713|      vis = $2,
-// 714|      attrs = $1,
-// 715|      is_list~,
-// 716|      doc = DocString::empty(),
-// 717|      loc = mk_loc($sloc)
-// 718|    )
-// 719|  }
+// 717|    attributes visibility "typealias" batch_type_alias_targets {
+// 718|    let (is_list, pkg, targets) = $4
+// 719|    TopBatchTypeAlias(
+// 720|      pkg~,
+// 721|      targets~,
+// 722|      vis = $2,
+// 723|      attrs = $1,
+// 724|      is_list~,
+// 725|      doc = DocString::empty(),
+// 726|      loc = mk_loc($sloc)
+// 727|    )
+// 728|  }
 
 ///|
 fn yy_action_47(
@@ -2903,22 +2977,22 @@ fn yy_action_47(
 }
 
 // file:///./parser.mbty
-// 720|    attributes visibility "typealias" type_ "as" UIDENT optional_type_parameters_no_constraints {
-// 721|    TopTypeDef(
-// 722|      TypeDecl::{
-// 723|        tycon : $6,
-// 724|        tycon_loc : mk_loc($loc($6)),
-// 725|        params : $7,
-// 726|        components: Alias($4),
-// 727|        type_vis : $2,
-// 728|        doc : DocString::empty(),
-// 729|        deriving: @list.empty(),
-// 730|        loc : mk_loc($sloc),
-// 731|        attrs : $1,
-// 732|        is_declare : false
-// 733|      }
-// 734|    )
-// 735|  }
+// 729|    attributes visibility "typealias" type_ "as" UIDENT optional_type_parameters_no_constraints {
+// 730|    TopTypeDef(
+// 731|      TypeDecl::{
+// 732|        tycon : $6,
+// 733|        tycon_loc : mk_loc($loc($6)),
+// 734|        params : $7,
+// 735|        components: Alias($4),
+// 736|        type_vis : $2,
+// 737|        doc : DocString::empty(),
+// 738|        deriving: @list.empty(),
+// 739|        loc : mk_loc($sloc),
+// 740|        attrs : $1,
+// 741|        is_declare : false
+// 742|      }
+// 743|    )
+// 744|  }
 
 ///|
 fn yy_action_48(
@@ -2960,18 +3034,18 @@ fn yy_action_48(
 }
 
 // file:///./parser.mbty
-// 753|    attributes visibility "traitalias" batch_type_alias_targets {
-// 754|    let (is_list, pkg, targets) = $4
-// 755|    TopBatchTraitAlias(
-// 756|      pkg~,
-// 757|      targets~,
-// 758|      vis = $2,
-// 759|      attrs = $1,
-// 760|      is_list~,
-// 761|      doc = DocString::empty(),
-// 762|      loc = mk_loc($sloc)
-// 763|    )
-// 764|  }
+// 762|    attributes visibility "traitalias" batch_type_alias_targets {
+// 763|    let (is_list, pkg, targets) = $4
+// 764|    TopBatchTraitAlias(
+// 765|      pkg~,
+// 766|      targets~,
+// 767|      vis = $2,
+// 768|      attrs = $1,
+// 769|      is_list~,
+// 770|      doc = DocString::empty(),
+// 771|      loc = mk_loc($sloc)
+// 772|    )
+// 773|  }
 
 ///|
 fn yy_action_49(
@@ -3007,24 +3081,24 @@ fn yy_action_49(
 }
 
 // file:///./parser.mbty
-// 778|    attributes visibility "impl" optional_type_parameters type_name "for" type_ "with" binder optional_bang parameters func_return_type impl_body {
-// 779|    let (ret_ty, err_ty) = $12
-// 780|    TopImpl(
-// 781|      self_ty = Some($7),
-// 782|      trait_ = $5,
-// 783|      method_name = $9,
-// 784|      has_error = $10,
-// 785|      quantifiers = $4,
-// 786|      params = $11,
-// 787|      ret_ty~,
-// 788|      err_ty~,
-// 789|      body = $13,
-// 790|      vis = $2,
-// 791|      loc = mk_loc($sloc),
-// 792|      attrs = $1,
-// 793|      doc = DocString::empty()
-// 794|    )
-// 795|  }
+// 787|    attributes visibility "impl" optional_type_parameters type_name "for" type_ "with" binder optional_bang parameters func_return_type impl_body {
+// 788|    let (ret_ty, err_ty) = $12
+// 789|    TopImpl(
+// 790|      self_ty = Some($7),
+// 791|      trait_ = $5,
+// 792|      method_name = $9,
+// 793|      has_error = $10,
+// 794|      quantifiers = $4,
+// 795|      params = $11,
+// 796|      ret_ty~,
+// 797|      err_ty~,
+// 798|      body = $13,
+// 799|      vis = $2,
+// 800|      loc = mk_loc($sloc),
+// 801|      attrs = $1,
+// 802|      doc = DocString::empty()
+// 803|    )
+// 804|  }
 
 ///|
 fn yy_action_50(
@@ -3074,18 +3148,18 @@ fn yy_action_50(
 }
 
 // file:///./parser.mbty
-// 814|    attributes is_declare visibility "impl" optional_type_parameters type_name "for" type_ {
-// 815|    TopImplRelation(
-// 816|      self_ty = $8,
-// 817|      trait_ = $6,
-// 818|      quantifiers = $5,
-// 819|      vis = $3,
-// 820|      attrs = $1,
-// 821|      loc = mk_loc($sloc),
-// 822|      doc = DocString::empty(),
-// 823|      is_declare = $2
-// 824|    )
-// 825|  }
+// 823|    attributes is_declare visibility "impl" optional_type_parameters type_name "for" type_ {
+// 824|    TopImplRelation(
+// 825|      self_ty = $8,
+// 826|      trait_ = $6,
+// 827|      quantifiers = $5,
+// 828|      vis = $3,
+// 829|      attrs = $1,
+// 830|      loc = mk_loc($sloc),
+// 831|      doc = DocString::empty(),
+// 832|      is_declare = $2
+// 833|    )
+// 834|  }
 
 ///|
 fn yy_action_51(
@@ -3125,24 +3199,24 @@ fn yy_action_51(
 }
 
 // file:///./parser.mbty
-// 796|    attributes visibility "impl" optional_type_parameters type_name "with" binder optional_bang parameters func_return_type impl_body {
-// 797|    let (ret_ty, err_ty) = $10
-// 798|    TopImpl(
-// 799|      self_ty = None,
-// 800|      trait_ = $5,
-// 801|      method_name = $7,
-// 802|      has_error = $8,
-// 803|      quantifiers = $4,
-// 804|      params = $9,
-// 805|      ret_ty~,
-// 806|      err_ty~,
-// 807|      body = $11,
-// 808|      vis = $2,
-// 809|      loc = mk_loc($sloc),
-// 810|      attrs = $1,
-// 811|      doc = DocString::empty()
-// 812|    )
-// 813|  }
+// 805|    attributes visibility "impl" optional_type_parameters type_name "with" binder optional_bang parameters func_return_type impl_body {
+// 806|    let (ret_ty, err_ty) = $10
+// 807|    TopImpl(
+// 808|      self_ty = None,
+// 809|      trait_ = $5,
+// 810|      method_name = $7,
+// 811|      has_error = $8,
+// 812|      quantifiers = $4,
+// 813|      params = $9,
+// 814|      ret_ty~,
+// 815|      err_ty~,
+// 816|      body = $11,
+// 817|      vis = $2,
+// 818|      loc = mk_loc($sloc),
+// 819|      attrs = $1,
+// 820|      doc = DocString::empty()
+// 821|    )
+// 822|  }
 
 ///|
 fn yy_action_52(
@@ -3191,23 +3265,23 @@ fn yy_action_52(
 }
 
 // file:///./parser.mbty
-// 826|    attributes visibility "enumview" optional_type_parameters UIDENT "{" list_semis(enum_constructor) "}" "for" type_ "with" binder parameters block_expr {
-// 827|    TopView(
-// 828|      quantifiers = $4,
-// 829|      source_ty = $10,
-// 830|      view_type_name = $5,
-// 831|      view_type_loc = mk_loc($loc($5)),
-// 832|      view_func_name = $12,
-// 833|      parameters = $13,
-// 834|      params_loc = mk_loc($loc($13)),
-// 835|      view_constrs = $7,
-// 836|      body = $14,
-// 837|      vis = $2,
-// 838|      loc = mk_loc($sloc),
-// 839|      attrs = $1,
-// 840|      doc = DocString::empty()
-// 841|    )
-// 842|  }
+// 835|    attributes visibility "enumview" optional_type_parameters UIDENT "{" list_semis(enum_constructor) "}" "for" type_ "with" binder parameters block_expr {
+// 836|    TopView(
+// 837|      quantifiers = $4,
+// 838|      source_ty = $10,
+// 839|      view_type_name = $5,
+// 840|      view_type_loc = mk_loc($loc($5)),
+// 841|      view_func_name = $12,
+// 842|      parameters = $13,
+// 843|      params_loc = mk_loc($loc($13)),
+// 844|      view_constrs = $7,
+// 845|      body = $14,
+// 846|      vis = $2,
+// 847|      loc = mk_loc($sloc),
+// 848|      attrs = $1,
+// 849|      doc = DocString::empty()
+// 850|    )
+// 851|  }
 
 ///|
 fn yy_action_53(
@@ -3259,19 +3333,19 @@ fn yy_action_53(
 }
 
 // file:///./parser.mbty
-// 843|    attributes visibility "using" PACKAGE_NAME "{" list_commas(using_binder) "}" {
-// 844|    TopUsing(
-// 845|      pkg = {
-// 846|        name : $4,
-// 847|        loc : mk_loc($loc($4))
-// 848|      },
-// 849|      names = $6,
-// 850|      vis = $2,
-// 851|      attrs = $1,
-// 852|      loc = mk_loc($loc),
-// 853|      doc = DocString::empty()
-// 854|    )
-// 855|  }
+// 852|    attributes visibility "using" PACKAGE_NAME "{" list_commas(using_binder) "}" {
+// 853|    TopUsing(
+// 854|      pkg = {
+// 855|        name : $4,
+// 856|        loc : mk_loc($loc($4))
+// 857|      },
+// 858|      names = $6,
+// 859|      vis = $2,
+// 860|      attrs = $1,
+// 861|      loc = mk_loc($loc),
+// 862|      doc = DocString::empty()
+// 863|    )
+// 864|  }
 
 ///|
 fn yy_action_54(
@@ -3311,9 +3385,9 @@ fn yy_action_54(
 }
 
 // file:///./parser.mbty
-// 884|    attributes is_declare visibility "type" UIDENT optional_type_parameters_no_constraints { 
-// 885|    ($1, $3, $2, $5, mk_loc($loc($5)), $6) 
-// 886|  }
+// 893|    attributes is_declare visibility "type" UIDENT optional_type_parameters_no_constraints { 
+// 894|    ($1, $3, $2, $5, mk_loc($loc($5)), $6) 
+// 895|  }
 
 ///|
 fn yy_action_55(
@@ -3346,7 +3420,7 @@ fn yy_action_55(
 }
 
 // file:///./parser.mbty
-// 890|    attributes is_declare visibility "suberror" UIDENT { ($1, $3, $2, $5, mk_loc($loc($5))) }
+// 899|    attributes is_declare visibility "suberror" UIDENT { ($1, $3, $2, $5, mk_loc($loc($5))) }
 
 ///|
 fn yy_action_56(
@@ -3377,9 +3451,9 @@ fn yy_action_56(
 }
 
 // file:///./parser.mbty
-// 894|    attributes visibility "struct" UIDENT optional_type_parameters_no_constraints { 
-// 895|    ($1, $2, $4, mk_loc($loc($4)), $5) 
-// 896|  }
+// 903|    attributes visibility "struct" UIDENT optional_type_parameters_no_constraints { 
+// 904|    ($1, $2, $4, mk_loc($loc($4)), $5) 
+// 905|  }
 
 ///|
 fn yy_action_57(
@@ -3409,9 +3483,9 @@ fn yy_action_57(
 }
 
 // file:///./parser.mbty
-// 900|    attributes visibility "enum" UIDENT optional_type_parameters_no_constraints { 
-// 901|    ($1, $2, $4, mk_loc($loc($4)), $5) 
-// 902|  }
+// 909|    attributes visibility "enum" UIDENT optional_type_parameters_no_constraints { 
+// 910|    ($1, $2, $4, mk_loc($loc($4)), $5) 
+// 911|  }
 
 ///|
 fn yy_action_58(
@@ -3441,24 +3515,25 @@ fn yy_action_58(
 }
 
 // file:///./parser.mbty
-// 320|    attributes visibility is_async fun_header_generic option(parameters) func_return_type {
-// 321|    let ((type_name, f), has_error, quants) = $4
-// 322|    let (return_type, error_type) = $6
-// 323|    FunDecl::{
-// 324|      type_name,
-// 325|      name: f,
-// 326|      has_error,
-// 327|      is_async : $3,
-// 328|      quantifiers: quants,
-// 329|      decl_params: $5,
-// 330|      params_loc: mk_loc($loc($5)),
-// 331|      return_type,
-// 332|      error_type,
-// 333|      vis: $2,
-// 334|      doc: DocString::empty(),
-// 335|      attrs: $1,
-// 336|    }
-// 337|  }
+// 325|    attributes visibility is_async fun_header_generic option(parameters) func_return_type {
+// 326|    let ((type_name, f), has_error, quants) = $4
+// 327|    let (return_type, error_type) = $6
+// 328|    FunDecl::{
+// 329|      type_name,
+// 330|      name: f,
+// 331|      has_error,
+// 332|      is_async : $3,
+// 333|      quantifiers: quants,
+// 334|      decl_params: $5,
+// 335|      params_loc: mk_loc($loc($5)),
+// 336|      return_type,
+// 337|      error_type,
+// 338|      vis: $2,
+// 339|      doc: DocString::empty(),
+// 340|      attrs: $1,
+// 341|      loc : mk_loc($loc)
+// 342|    }
+// 343|  }
 
 ///|
 fn yy_action_59(
@@ -3477,6 +3552,12 @@ fn yy_action_59(
   let _end_pos_of_item4 = _args[3].2
   guard _sub_action_1_result is YYObj_Visibility(_dollar2)
   guard _sub_action_0_result is YYObj_List_Attribute_(_dollar1)
+  let _start_pos = if _args.length() == 0 { _last_pos } else { _args[0].1 }
+  let _end_pos = if _args.length() == 0 {
+    _last_pos
+  } else {
+    _args[_args.length() - 1].2
+  }
   YYObj_FunDecl(
     {
       ()
@@ -3495,25 +3576,26 @@ fn yy_action_59(
         vis: _dollar2,
         doc: DocString::empty(),
         attrs: _dollar1,
+        loc: mk_loc((_start_pos, _end_pos)),
       }
     },
   )
 }
 
 // file:///./parser.mbty
-// 765|    attributes is_async "test" option(loced_string) option(parameters) block_expr_with_local_types {
-// 766|    let (local_types, expr) = $6
-// 767|    TopTest(
-// 768|      expr~,
-// 769|      name = $4,
-// 770|      params = $5,
-// 771|      local_types~,
-// 772|      is_async = $2,
-// 773|      loc = mk_loc($sloc),
-// 774|      attrs = $1,
-// 775|      doc = DocString::empty()
-// 776|    )
-// 777|  }
+// 774|    attributes is_async "test" option(loced_string) option(parameters) block_expr_with_local_types {
+// 775|    let (local_types, expr) = $6
+// 776|    TopTest(
+// 777|      expr~,
+// 778|      name = $4,
+// 779|      params = $5,
+// 780|      local_types~,
+// 781|      is_async = $2,
+// 782|      loc = mk_loc($sloc),
+// 783|      attrs = $1,
+// 784|      doc = DocString::empty()
+// 785|    )
+// 786|  }
 
 ///|
 fn yy_action_61(
@@ -3552,24 +3634,25 @@ fn yy_action_61(
 }
 
 // file:///./parser.mbty
-// 320|    attributes visibility is_async fun_header_generic option(parameters) func_return_type {
-// 321|    let ((type_name, f), has_error, quants) = $4
-// 322|    let (return_type, error_type) = $6
-// 323|    FunDecl::{
-// 324|      type_name,
-// 325|      name: f,
-// 326|      has_error,
-// 327|      is_async : $3,
-// 328|      quantifiers: quants,
-// 329|      decl_params: $5,
-// 330|      params_loc: mk_loc($loc($5)),
-// 331|      return_type,
-// 332|      error_type,
-// 333|      vis: $2,
-// 334|      doc: DocString::empty(),
-// 335|      attrs: $1,
-// 336|    }
-// 337|  }
+// 325|    attributes visibility is_async fun_header_generic option(parameters) func_return_type {
+// 326|    let ((type_name, f), has_error, quants) = $4
+// 327|    let (return_type, error_type) = $6
+// 328|    FunDecl::{
+// 329|      type_name,
+// 330|      name: f,
+// 331|      has_error,
+// 332|      is_async : $3,
+// 333|      quantifiers: quants,
+// 334|      decl_params: $5,
+// 335|      params_loc: mk_loc($loc($5)),
+// 336|      return_type,
+// 337|      error_type,
+// 338|      vis: $2,
+// 339|      doc: DocString::empty(),
+// 340|      attrs: $1,
+// 341|      loc : mk_loc($loc)
+// 342|    }
+// 343|  }
 
 ///|
 fn yy_action_62(
@@ -3588,6 +3671,12 @@ fn yy_action_62(
   let _end_pos_of_item4 = _args[2].2
   guard _sub_action_1_result is YYObj_Visibility(_dollar2)
   guard _sub_action_0_result is YYObj_List_Attribute_(_dollar1)
+  let _start_pos = if _args.length() == 0 { _last_pos } else { _args[0].1 }
+  let _end_pos = if _args.length() == 0 {
+    _last_pos
+  } else {
+    _args[_args.length() - 1].2
+  }
   YYObj_FunDecl(
     {
       ()
@@ -3606,30 +3695,32 @@ fn yy_action_62(
         vis: _dollar2,
         doc: DocString::empty(),
         attrs: _dollar1,
+        loc: mk_loc((_start_pos, _end_pos)),
       }
     },
   )
 }
 
 // file:///./parser.mbty
-// 320|    attributes visibility is_async fun_header_generic option(parameters) func_return_type {
-// 321|    let ((type_name, f), has_error, quants) = $4
-// 322|    let (return_type, error_type) = $6
-// 323|    FunDecl::{
-// 324|      type_name,
-// 325|      name: f,
-// 326|      has_error,
-// 327|      is_async : $3,
-// 328|      quantifiers: quants,
-// 329|      decl_params: $5,
-// 330|      params_loc: mk_loc($loc($5)),
-// 331|      return_type,
-// 332|      error_type,
-// 333|      vis: $2,
-// 334|      doc: DocString::empty(),
-// 335|      attrs: $1,
-// 336|    }
-// 337|  }
+// 325|    attributes visibility is_async fun_header_generic option(parameters) func_return_type {
+// 326|    let ((type_name, f), has_error, quants) = $4
+// 327|    let (return_type, error_type) = $6
+// 328|    FunDecl::{
+// 329|      type_name,
+// 330|      name: f,
+// 331|      has_error,
+// 332|      is_async : $3,
+// 333|      quantifiers: quants,
+// 334|      decl_params: $5,
+// 335|      params_loc: mk_loc($loc($5)),
+// 336|      return_type,
+// 337|      error_type,
+// 338|      vis: $2,
+// 339|      doc: DocString::empty(),
+// 340|      attrs: $1,
+// 341|      loc : mk_loc($loc)
+// 342|    }
+// 343|  }
 
 ///|
 fn yy_action_63(
@@ -3648,6 +3739,12 @@ fn yy_action_63(
   let _end_pos_of_item4 = _args[4].2
   guard _sub_action_1_result is YYObj_Visibility(_dollar2)
   guard _sub_action_0_result is YYObj_List_Attribute_(_dollar1)
+  let _start_pos = if _args.length() == 0 { _last_pos } else { _args[0].1 }
+  let _end_pos = if _args.length() == 0 {
+    _last_pos
+  } else {
+    _args[_args.length() - 1].2
+  }
   YYObj_FunDecl(
     {
       ()
@@ -3666,30 +3763,32 @@ fn yy_action_63(
         vis: _dollar2,
         doc: DocString::empty(),
         attrs: _dollar1,
+        loc: mk_loc((_start_pos, _end_pos)),
       }
     },
   )
 }
 
 // file:///./parser.mbty
-// 320|    attributes visibility is_async fun_header_generic option(parameters) func_return_type {
-// 321|    let ((type_name, f), has_error, quants) = $4
-// 322|    let (return_type, error_type) = $6
-// 323|    FunDecl::{
-// 324|      type_name,
-// 325|      name: f,
-// 326|      has_error,
-// 327|      is_async : $3,
-// 328|      quantifiers: quants,
-// 329|      decl_params: $5,
-// 330|      params_loc: mk_loc($loc($5)),
-// 331|      return_type,
-// 332|      error_type,
-// 333|      vis: $2,
-// 334|      doc: DocString::empty(),
-// 335|      attrs: $1,
-// 336|    }
-// 337|  }
+// 325|    attributes visibility is_async fun_header_generic option(parameters) func_return_type {
+// 326|    let ((type_name, f), has_error, quants) = $4
+// 327|    let (return_type, error_type) = $6
+// 328|    FunDecl::{
+// 329|      type_name,
+// 330|      name: f,
+// 331|      has_error,
+// 332|      is_async : $3,
+// 333|      quantifiers: quants,
+// 334|      decl_params: $5,
+// 335|      params_loc: mk_loc($loc($5)),
+// 336|      return_type,
+// 337|      error_type,
+// 338|      vis: $2,
+// 339|      doc: DocString::empty(),
+// 340|      attrs: $1,
+// 341|      loc : mk_loc($loc)
+// 342|    }
+// 343|  }
 
 ///|
 fn yy_action_64(
@@ -3708,6 +3807,12 @@ fn yy_action_64(
   let _end_pos_of_item4 = _args[3].2
   guard _sub_action_1_result is YYObj_Visibility(_dollar2)
   guard _sub_action_0_result is YYObj_List_Attribute_(_dollar1)
+  let _start_pos = if _args.length() == 0 { _last_pos } else { _args[0].1 }
+  let _end_pos = if _args.length() == 0 {
+    _last_pos
+  } else {
+    _args[_args.length() - 1].2
+  }
   YYObj_FunDecl(
     {
       ()
@@ -3726,31 +3831,33 @@ fn yy_action_64(
         vis: _dollar2,
         doc: DocString::empty(),
         attrs: _dollar1,
+        loc: mk_loc((_start_pos, _end_pos)),
       }
     },
   )
 }
 
 // file:///./parser.mbty
-// 401|    attributes visibility "extern" STRING "fn" fun_binder optional_bang optional_type_parameters option(parameters) func_return_type {
-// 402|    let (type_name, f) = $6
-// 403|    let (return_type, error_type) = $10
-// 404|    let fn_decl = FunDecl::{
-// 405|      type_name,
-// 406|      name: f,
-// 407|      has_error : $7,
-// 408|      is_async : None,
-// 409|      quantifiers: $8,
-// 410|      decl_params: $9,
-// 411|      params_loc: mk_loc($loc($9)),
-// 412|      return_type,
-// 413|      error_type,
-// 414|      vis: $2,
-// 415|      doc: DocString::empty(),
-// 416|      attrs: $1,
-// 417|    }
-// 418|    ($4, fn_decl)
-// 419|  }
+// 408|    attributes visibility "extern" STRING "fn" fun_binder optional_bang optional_type_parameters option(parameters) func_return_type {
+// 409|    let (type_name, f) = $6
+// 410|    let (return_type, error_type) = $10
+// 411|    let fn_decl = FunDecl::{
+// 412|      type_name,
+// 413|      name: f,
+// 414|      has_error : $7,
+// 415|      is_async : None,
+// 416|      quantifiers: $8,
+// 417|      decl_params: $9,
+// 418|      params_loc: mk_loc($loc($9)),
+// 419|      return_type,
+// 420|      error_type,
+// 421|      vis: $2,
+// 422|      doc: DocString::empty(),
+// 423|      attrs: $1,
+// 424|      loc : mk_loc($loc)
+// 425|    }
+// 426|    ($4, fn_decl)
+// 427|  }
 
 ///|
 fn yy_action_65(
@@ -3768,6 +3875,12 @@ fn yy_action_65(
   let _end_pos_of_item8 = _args[8].2
   guard _sub_action_1_result is YYObj_Visibility(_dollar2)
   guard _sub_action_0_result is YYObj_List_Attribute_(_dollar1)
+  let _start_pos = if _args.length() == 0 { _last_pos } else { _args[0].1 }
+  let _end_pos = if _args.length() == 0 {
+    _last_pos
+  } else {
+    _args[_args.length() - 1].2
+  }
   guard _args[3].0 is YYObj_StringLiteral(_dollar4)
   YYObj__StringLiteral__FunDecl_(
     {
@@ -3787,6 +3900,7 @@ fn yy_action_65(
         vis: _dollar2,
         doc: DocString::empty(),
         attrs: _dollar1,
+        loc: mk_loc((_start_pos, _end_pos)),
       }
       (_dollar4, fn_decl)
     },
@@ -3794,22 +3908,22 @@ fn yy_action_65(
 }
 
 // file:///./parser.mbty
-// 477|    attributes visibility "extern" "type" UIDENT optional_type_parameters_no_constraints deriving_directive_list {
-// 478|    TopTypeDef(
-// 479|      TypeDecl::{
-// 480|        tycon : $5,
-// 481|        tycon_loc : mk_loc($loc($5)),
-// 482|        params : $6,
-// 483|        components: Extern,
-// 484|        type_vis : $2,
-// 485|        doc : DocString::empty(),
-// 486|        deriving: $7,
-// 487|        loc : mk_loc($sloc),
-// 488|        attrs : $1,
-// 489|        is_declare : false
-// 490|      }
-// 491|    )
-// 492|  }
+// 485|    attributes visibility "extern" "type" UIDENT optional_type_parameters_no_constraints deriving_directive_list {
+// 486|    TopTypeDef(
+// 487|      TypeDecl::{
+// 488|        tycon : $5,
+// 489|        tycon_loc : mk_loc($loc($5)),
+// 490|        params : $6,
+// 491|        components: Extern,
+// 492|        type_vis : $2,
+// 493|        doc : DocString::empty(),
+// 494|        deriving: $7,
+// 495|        loc : mk_loc($sloc),
+// 496|        attrs : $1,
+// 497|        is_declare : false
+// 498|      }
+// 499|    )
+// 500|  }
 
 ///|
 fn yy_action_66(
@@ -3851,7 +3965,7 @@ fn yy_action_66(
 }
 
 // file:///./parser.mbty
-// 451|    attributes is_declare visibility "let" binder opt_annot { ($1, false, $2, $3, $5, $6) }
+// 459|    attributes is_declare visibility "let" binder opt_annot { ($1, false, $2, $3, $5, $6) }
 
 ///|
 fn yy_action_67(
@@ -3877,7 +3991,7 @@ fn yy_action_67(
 }
 
 // file:///./parser.mbty
-// 451|    attributes is_declare visibility "let" binder opt_annot { ($1, false, $2, $3, $5, $6) }
+// 459|    attributes is_declare visibility "let" binder opt_annot { ($1, false, $2, $3, $5, $6) }
 
 ///|
 fn yy_action_68(
@@ -3903,7 +4017,7 @@ fn yy_action_68(
 }
 
 // file:///./parser.mbty
-// 452|    attributes is_declare visibility "const" UIDENT opt_annot { ($1, true, $2, $3, Binder::{ name : $5, loc : mk_loc($loc($5)) }, $6) }
+// 460|    attributes is_declare visibility "const" UIDENT opt_annot { ($1, true, $2, $3, Binder::{ name : $5, loc : mk_loc($loc($5)) }, $6) }
 
 ///|
 fn yy_action_69(
@@ -3940,7 +4054,7 @@ fn yy_action_69(
 }
 
 // file:///./parser.mbty
-// 452|    attributes is_declare visibility "const" UIDENT opt_annot { ($1, true, $2, $3, Binder::{ name : $5, loc : mk_loc($loc($5)) }, $6) }
+// 460|    attributes is_declare visibility "const" UIDENT opt_annot { ($1, true, $2, $3, Binder::{ name : $5, loc : mk_loc($loc($5)) }, $6) }
 
 ///|
 fn yy_action_70(
@@ -3977,19 +4091,19 @@ fn yy_action_70(
 }
 
 // file:///./parser.mbty
-// 676|    attributes visibility "fnalias" func_alias_targets {
-// 677|    let (pkg, type_name, is_list, targets) = $4
-// 678|    TopFuncAlias(
-// 679|      pkg~,
-// 680|      type_name~,
-// 681|      targets~,
-// 682|      vis = $2,
-// 683|      attrs = $1,
-// 684|      is_list~,
-// 685|      doc = DocString::empty(),
-// 686|      loc = mk_loc($sloc)
-// 687|    )
-// 688|  }
+// 685|    attributes visibility "fnalias" func_alias_targets {
+// 686|    let (pkg, type_name, is_list, targets) = $4
+// 687|    TopFuncAlias(
+// 688|      pkg~,
+// 689|      type_name~,
+// 690|      targets~,
+// 691|      vis = $2,
+// 692|      attrs = $1,
+// 693|      is_list~,
+// 694|      doc = DocString::empty(),
+// 695|      loc = mk_loc($sloc)
+// 696|    )
+// 697|  }
 
 ///|
 fn yy_action_71(
@@ -4026,25 +4140,25 @@ fn yy_action_71(
 }
 
 // file:///./parser.mbty
-// 689|    attributes is_declare visibility "trait" UIDENT option(preceded(COLON, separated_nonempty_list(PLUS, tvar_constraint))) "{" list_semis(trait_method_decl) "}" {
-// 690|    let name = Binder::{ name: $5, loc: mk_loc($loc($4)) }
-// 691|    let supers = match $6 {
-// 692|      None => @list.empty()
-// 693|      Some(supers) => supers
-// 694|    }
-// 695|    TopTrait(
-// 696|      TraitDecl::{
-// 697|        name,
-// 698|        supers,
-// 699|        methods: $8,
-// 700|        vis: $3,
-// 701|        loc: mk_loc($sloc),
-// 702|        attrs: $1,
-// 703|        doc : DocString::empty(),
-// 704|        is_declare : $2
-// 705|      }
-// 706|    )
-// 707|  }
+// 698|    attributes is_declare visibility "trait" UIDENT option(preceded(COLON, separated_nonempty_list(PLUS, tvar_constraint))) "{" list_semis(trait_method_decl) "}" {
+// 699|    let name = Binder::{ name: $5, loc: mk_loc($loc($4)) }
+// 700|    let supers = match $6 {
+// 701|      None => @list.empty()
+// 702|      Some(supers) => supers
+// 703|    }
+// 704|    TopTrait(
+// 705|      TraitDecl::{
+// 706|        name,
+// 707|        supers,
+// 708|        methods: $8,
+// 709|        vis: $3,
+// 710|        loc: mk_loc($sloc),
+// 711|        attrs: $1,
+// 712|        doc : DocString::empty(),
+// 713|        is_declare : $2
+// 714|      }
+// 715|    )
+// 716|  }
 
 ///|
 fn yy_action_72(
@@ -4094,18 +4208,18 @@ fn yy_action_72(
 }
 
 // file:///./parser.mbty
-// 708|    attributes visibility "typealias" batch_type_alias_targets {
-// 709|    let (is_list, pkg, targets) = $4
-// 710|    TopBatchTypeAlias(
-// 711|      pkg~,
-// 712|      targets~,
-// 713|      vis = $2,
-// 714|      attrs = $1,
-// 715|      is_list~,
-// 716|      doc = DocString::empty(),
-// 717|      loc = mk_loc($sloc)
-// 718|    )
-// 719|  }
+// 717|    attributes visibility "typealias" batch_type_alias_targets {
+// 718|    let (is_list, pkg, targets) = $4
+// 719|    TopBatchTypeAlias(
+// 720|      pkg~,
+// 721|      targets~,
+// 722|      vis = $2,
+// 723|      attrs = $1,
+// 724|      is_list~,
+// 725|      doc = DocString::empty(),
+// 726|      loc = mk_loc($sloc)
+// 727|    )
+// 728|  }
 
 ///|
 fn yy_action_73(
@@ -4141,22 +4255,22 @@ fn yy_action_73(
 }
 
 // file:///./parser.mbty
-// 720|    attributes visibility "typealias" type_ "as" UIDENT optional_type_parameters_no_constraints {
-// 721|    TopTypeDef(
-// 722|      TypeDecl::{
-// 723|        tycon : $6,
-// 724|        tycon_loc : mk_loc($loc($6)),
-// 725|        params : $7,
-// 726|        components: Alias($4),
-// 727|        type_vis : $2,
-// 728|        doc : DocString::empty(),
-// 729|        deriving: @list.empty(),
-// 730|        loc : mk_loc($sloc),
-// 731|        attrs : $1,
-// 732|        is_declare : false
-// 733|      }
-// 734|    )
-// 735|  }
+// 729|    attributes visibility "typealias" type_ "as" UIDENT optional_type_parameters_no_constraints {
+// 730|    TopTypeDef(
+// 731|      TypeDecl::{
+// 732|        tycon : $6,
+// 733|        tycon_loc : mk_loc($loc($6)),
+// 734|        params : $7,
+// 735|        components: Alias($4),
+// 736|        type_vis : $2,
+// 737|        doc : DocString::empty(),
+// 738|        deriving: @list.empty(),
+// 739|        loc : mk_loc($sloc),
+// 740|        attrs : $1,
+// 741|        is_declare : false
+// 742|      }
+// 743|    )
+// 744|  }
 
 ///|
 fn yy_action_74(
@@ -4198,18 +4312,18 @@ fn yy_action_74(
 }
 
 // file:///./parser.mbty
-// 753|    attributes visibility "traitalias" batch_type_alias_targets {
-// 754|    let (is_list, pkg, targets) = $4
-// 755|    TopBatchTraitAlias(
-// 756|      pkg~,
-// 757|      targets~,
-// 758|      vis = $2,
-// 759|      attrs = $1,
-// 760|      is_list~,
-// 761|      doc = DocString::empty(),
-// 762|      loc = mk_loc($sloc)
-// 763|    )
-// 764|  }
+// 762|    attributes visibility "traitalias" batch_type_alias_targets {
+// 763|    let (is_list, pkg, targets) = $4
+// 764|    TopBatchTraitAlias(
+// 765|      pkg~,
+// 766|      targets~,
+// 767|      vis = $2,
+// 768|      attrs = $1,
+// 769|      is_list~,
+// 770|      doc = DocString::empty(),
+// 771|      loc = mk_loc($sloc)
+// 772|    )
+// 773|  }
 
 ///|
 fn yy_action_75(
@@ -4245,24 +4359,24 @@ fn yy_action_75(
 }
 
 // file:///./parser.mbty
-// 778|    attributes visibility "impl" optional_type_parameters type_name "for" type_ "with" binder optional_bang parameters func_return_type impl_body {
-// 779|    let (ret_ty, err_ty) = $12
-// 780|    TopImpl(
-// 781|      self_ty = Some($7),
-// 782|      trait_ = $5,
-// 783|      method_name = $9,
-// 784|      has_error = $10,
-// 785|      quantifiers = $4,
-// 786|      params = $11,
-// 787|      ret_ty~,
-// 788|      err_ty~,
-// 789|      body = $13,
-// 790|      vis = $2,
-// 791|      loc = mk_loc($sloc),
-// 792|      attrs = $1,
-// 793|      doc = DocString::empty()
-// 794|    )
-// 795|  }
+// 787|    attributes visibility "impl" optional_type_parameters type_name "for" type_ "with" binder optional_bang parameters func_return_type impl_body {
+// 788|    let (ret_ty, err_ty) = $12
+// 789|    TopImpl(
+// 790|      self_ty = Some($7),
+// 791|      trait_ = $5,
+// 792|      method_name = $9,
+// 793|      has_error = $10,
+// 794|      quantifiers = $4,
+// 795|      params = $11,
+// 796|      ret_ty~,
+// 797|      err_ty~,
+// 798|      body = $13,
+// 799|      vis = $2,
+// 800|      loc = mk_loc($sloc),
+// 801|      attrs = $1,
+// 802|      doc = DocString::empty()
+// 803|    )
+// 804|  }
 
 ///|
 fn yy_action_76(
@@ -4312,18 +4426,18 @@ fn yy_action_76(
 }
 
 // file:///./parser.mbty
-// 814|    attributes is_declare visibility "impl" optional_type_parameters type_name "for" type_ {
-// 815|    TopImplRelation(
-// 816|      self_ty = $8,
-// 817|      trait_ = $6,
-// 818|      quantifiers = $5,
-// 819|      vis = $3,
-// 820|      attrs = $1,
-// 821|      loc = mk_loc($sloc),
-// 822|      doc = DocString::empty(),
-// 823|      is_declare = $2
-// 824|    )
-// 825|  }
+// 823|    attributes is_declare visibility "impl" optional_type_parameters type_name "for" type_ {
+// 824|    TopImplRelation(
+// 825|      self_ty = $8,
+// 826|      trait_ = $6,
+// 827|      quantifiers = $5,
+// 828|      vis = $3,
+// 829|      attrs = $1,
+// 830|      loc = mk_loc($sloc),
+// 831|      doc = DocString::empty(),
+// 832|      is_declare = $2
+// 833|    )
+// 834|  }
 
 ///|
 fn yy_action_77(
@@ -4363,24 +4477,24 @@ fn yy_action_77(
 }
 
 // file:///./parser.mbty
-// 796|    attributes visibility "impl" optional_type_parameters type_name "with" binder optional_bang parameters func_return_type impl_body {
-// 797|    let (ret_ty, err_ty) = $10
-// 798|    TopImpl(
-// 799|      self_ty = None,
-// 800|      trait_ = $5,
-// 801|      method_name = $7,
-// 802|      has_error = $8,
-// 803|      quantifiers = $4,
-// 804|      params = $9,
-// 805|      ret_ty~,
-// 806|      err_ty~,
-// 807|      body = $11,
-// 808|      vis = $2,
-// 809|      loc = mk_loc($sloc),
-// 810|      attrs = $1,
-// 811|      doc = DocString::empty()
-// 812|    )
-// 813|  }
+// 805|    attributes visibility "impl" optional_type_parameters type_name "with" binder optional_bang parameters func_return_type impl_body {
+// 806|    let (ret_ty, err_ty) = $10
+// 807|    TopImpl(
+// 808|      self_ty = None,
+// 809|      trait_ = $5,
+// 810|      method_name = $7,
+// 811|      has_error = $8,
+// 812|      quantifiers = $4,
+// 813|      params = $9,
+// 814|      ret_ty~,
+// 815|      err_ty~,
+// 816|      body = $11,
+// 817|      vis = $2,
+// 818|      loc = mk_loc($sloc),
+// 819|      attrs = $1,
+// 820|      doc = DocString::empty()
+// 821|    )
+// 822|  }
 
 ///|
 fn yy_action_78(
@@ -4429,23 +4543,23 @@ fn yy_action_78(
 }
 
 // file:///./parser.mbty
-// 826|    attributes visibility "enumview" optional_type_parameters UIDENT "{" list_semis(enum_constructor) "}" "for" type_ "with" binder parameters block_expr {
-// 827|    TopView(
-// 828|      quantifiers = $4,
-// 829|      source_ty = $10,
-// 830|      view_type_name = $5,
-// 831|      view_type_loc = mk_loc($loc($5)),
-// 832|      view_func_name = $12,
-// 833|      parameters = $13,
-// 834|      params_loc = mk_loc($loc($13)),
-// 835|      view_constrs = $7,
-// 836|      body = $14,
-// 837|      vis = $2,
-// 838|      loc = mk_loc($sloc),
-// 839|      attrs = $1,
-// 840|      doc = DocString::empty()
-// 841|    )
-// 842|  }
+// 835|    attributes visibility "enumview" optional_type_parameters UIDENT "{" list_semis(enum_constructor) "}" "for" type_ "with" binder parameters block_expr {
+// 836|    TopView(
+// 837|      quantifiers = $4,
+// 838|      source_ty = $10,
+// 839|      view_type_name = $5,
+// 840|      view_type_loc = mk_loc($loc($5)),
+// 841|      view_func_name = $12,
+// 842|      parameters = $13,
+// 843|      params_loc = mk_loc($loc($13)),
+// 844|      view_constrs = $7,
+// 845|      body = $14,
+// 846|      vis = $2,
+// 847|      loc = mk_loc($sloc),
+// 848|      attrs = $1,
+// 849|      doc = DocString::empty()
+// 850|    )
+// 851|  }
 
 ///|
 fn yy_action_79(
@@ -4497,19 +4611,19 @@ fn yy_action_79(
 }
 
 // file:///./parser.mbty
-// 843|    attributes visibility "using" PACKAGE_NAME "{" list_commas(using_binder) "}" {
-// 844|    TopUsing(
-// 845|      pkg = {
-// 846|        name : $4,
-// 847|        loc : mk_loc($loc($4))
-// 848|      },
-// 849|      names = $6,
-// 850|      vis = $2,
-// 851|      attrs = $1,
-// 852|      loc = mk_loc($loc),
-// 853|      doc = DocString::empty()
-// 854|    )
-// 855|  }
+// 852|    attributes visibility "using" PACKAGE_NAME "{" list_commas(using_binder) "}" {
+// 853|    TopUsing(
+// 854|      pkg = {
+// 855|        name : $4,
+// 856|        loc : mk_loc($loc($4))
+// 857|      },
+// 858|      names = $6,
+// 859|      vis = $2,
+// 860|      attrs = $1,
+// 861|      loc = mk_loc($loc),
+// 862|      doc = DocString::empty()
+// 863|    )
+// 864|  }
 
 ///|
 fn yy_action_80(
@@ -4549,9 +4663,9 @@ fn yy_action_80(
 }
 
 // file:///./parser.mbty
-// 884|    attributes is_declare visibility "type" UIDENT optional_type_parameters_no_constraints { 
-// 885|    ($1, $3, $2, $5, mk_loc($loc($5)), $6) 
-// 886|  }
+// 893|    attributes is_declare visibility "type" UIDENT optional_type_parameters_no_constraints { 
+// 894|    ($1, $3, $2, $5, mk_loc($loc($5)), $6) 
+// 895|  }
 
 ///|
 fn yy_action_81(
@@ -4584,7 +4698,7 @@ fn yy_action_81(
 }
 
 // file:///./parser.mbty
-// 890|    attributes is_declare visibility "suberror" UIDENT { ($1, $3, $2, $5, mk_loc($loc($5))) }
+// 899|    attributes is_declare visibility "suberror" UIDENT { ($1, $3, $2, $5, mk_loc($loc($5))) }
 
 ///|
 fn yy_action_82(
@@ -4615,9 +4729,9 @@ fn yy_action_82(
 }
 
 // file:///./parser.mbty
-// 894|    attributes visibility "struct" UIDENT optional_type_parameters_no_constraints { 
-// 895|    ($1, $2, $4, mk_loc($loc($4)), $5) 
-// 896|  }
+// 903|    attributes visibility "struct" UIDENT optional_type_parameters_no_constraints { 
+// 904|    ($1, $2, $4, mk_loc($loc($4)), $5) 
+// 905|  }
 
 ///|
 fn yy_action_83(
@@ -4647,9 +4761,9 @@ fn yy_action_83(
 }
 
 // file:///./parser.mbty
-// 900|    attributes visibility "enum" UIDENT optional_type_parameters_no_constraints { 
-// 901|    ($1, $2, $4, mk_loc($loc($4)), $5) 
-// 902|  }
+// 909|    attributes visibility "enum" UIDENT optional_type_parameters_no_constraints { 
+// 910|    ($1, $2, $4, mk_loc($loc($4)), $5) 
+// 911|  }
 
 ///|
 fn yy_action_84(
@@ -4679,24 +4793,25 @@ fn yy_action_84(
 }
 
 // file:///./parser.mbty
-// 320|    attributes visibility is_async fun_header_generic option(parameters) func_return_type {
-// 321|    let ((type_name, f), has_error, quants) = $4
-// 322|    let (return_type, error_type) = $6
-// 323|    FunDecl::{
-// 324|      type_name,
-// 325|      name: f,
-// 326|      has_error,
-// 327|      is_async : $3,
-// 328|      quantifiers: quants,
-// 329|      decl_params: $5,
-// 330|      params_loc: mk_loc($loc($5)),
-// 331|      return_type,
-// 332|      error_type,
-// 333|      vis: $2,
-// 334|      doc: DocString::empty(),
-// 335|      attrs: $1,
-// 336|    }
-// 337|  }
+// 325|    attributes visibility is_async fun_header_generic option(parameters) func_return_type {
+// 326|    let ((type_name, f), has_error, quants) = $4
+// 327|    let (return_type, error_type) = $6
+// 328|    FunDecl::{
+// 329|      type_name,
+// 330|      name: f,
+// 331|      has_error,
+// 332|      is_async : $3,
+// 333|      quantifiers: quants,
+// 334|      decl_params: $5,
+// 335|      params_loc: mk_loc($loc($5)),
+// 336|      return_type,
+// 337|      error_type,
+// 338|      vis: $2,
+// 339|      doc: DocString::empty(),
+// 340|      attrs: $1,
+// 341|      loc : mk_loc($loc)
+// 342|    }
+// 343|  }
 
 ///|
 fn yy_action_85(
@@ -4715,6 +4830,12 @@ fn yy_action_85(
   let _end_pos_of_item4 = _args[5].2
   guard _sub_action_1_result is YYObj_Visibility(_dollar2)
   guard _sub_action_0_result is YYObj_List_Attribute_(_dollar1)
+  let _start_pos = if _args.length() == 0 { _last_pos } else { _args[0].1 }
+  let _end_pos = if _args.length() == 0 {
+    _last_pos
+  } else {
+    _args[_args.length() - 1].2
+  }
   YYObj_FunDecl(
     {
       ()
@@ -4733,30 +4854,32 @@ fn yy_action_85(
         vis: _dollar2,
         doc: DocString::empty(),
         attrs: _dollar1,
+        loc: mk_loc((_start_pos, _end_pos)),
       }
     },
   )
 }
 
 // file:///./parser.mbty
-// 320|    attributes visibility is_async fun_header_generic option(parameters) func_return_type {
-// 321|    let ((type_name, f), has_error, quants) = $4
-// 322|    let (return_type, error_type) = $6
-// 323|    FunDecl::{
-// 324|      type_name,
-// 325|      name: f,
-// 326|      has_error,
-// 327|      is_async : $3,
-// 328|      quantifiers: quants,
-// 329|      decl_params: $5,
-// 330|      params_loc: mk_loc($loc($5)),
-// 331|      return_type,
-// 332|      error_type,
-// 333|      vis: $2,
-// 334|      doc: DocString::empty(),
-// 335|      attrs: $1,
-// 336|    }
-// 337|  }
+// 325|    attributes visibility is_async fun_header_generic option(parameters) func_return_type {
+// 326|    let ((type_name, f), has_error, quants) = $4
+// 327|    let (return_type, error_type) = $6
+// 328|    FunDecl::{
+// 329|      type_name,
+// 330|      name: f,
+// 331|      has_error,
+// 332|      is_async : $3,
+// 333|      quantifiers: quants,
+// 334|      decl_params: $5,
+// 335|      params_loc: mk_loc($loc($5)),
+// 336|      return_type,
+// 337|      error_type,
+// 338|      vis: $2,
+// 339|      doc: DocString::empty(),
+// 340|      attrs: $1,
+// 341|      loc : mk_loc($loc)
+// 342|    }
+// 343|  }
 
 ///|
 fn yy_action_86(
@@ -4775,6 +4898,12 @@ fn yy_action_86(
   let _end_pos_of_item4 = _args[4].2
   guard _sub_action_1_result is YYObj_Visibility(_dollar2)
   guard _sub_action_0_result is YYObj_List_Attribute_(_dollar1)
+  let _start_pos = if _args.length() == 0 { _last_pos } else { _args[0].1 }
+  let _end_pos = if _args.length() == 0 {
+    _last_pos
+  } else {
+    _args[_args.length() - 1].2
+  }
   YYObj_FunDecl(
     {
       ()
@@ -4793,31 +4922,33 @@ fn yy_action_86(
         vis: _dollar2,
         doc: DocString::empty(),
         attrs: _dollar1,
+        loc: mk_loc((_start_pos, _end_pos)),
       }
     },
   )
 }
 
 // file:///./parser.mbty
-// 401|    attributes visibility "extern" STRING "fn" fun_binder optional_bang optional_type_parameters option(parameters) func_return_type {
-// 402|    let (type_name, f) = $6
-// 403|    let (return_type, error_type) = $10
-// 404|    let fn_decl = FunDecl::{
-// 405|      type_name,
-// 406|      name: f,
-// 407|      has_error : $7,
-// 408|      is_async : None,
-// 409|      quantifiers: $8,
-// 410|      decl_params: $9,
-// 411|      params_loc: mk_loc($loc($9)),
-// 412|      return_type,
-// 413|      error_type,
-// 414|      vis: $2,
-// 415|      doc: DocString::empty(),
-// 416|      attrs: $1,
-// 417|    }
-// 418|    ($4, fn_decl)
-// 419|  }
+// 408|    attributes visibility "extern" STRING "fn" fun_binder optional_bang optional_type_parameters option(parameters) func_return_type {
+// 409|    let (type_name, f) = $6
+// 410|    let (return_type, error_type) = $10
+// 411|    let fn_decl = FunDecl::{
+// 412|      type_name,
+// 413|      name: f,
+// 414|      has_error : $7,
+// 415|      is_async : None,
+// 416|      quantifiers: $8,
+// 417|      decl_params: $9,
+// 418|      params_loc: mk_loc($loc($9)),
+// 419|      return_type,
+// 420|      error_type,
+// 421|      vis: $2,
+// 422|      doc: DocString::empty(),
+// 423|      attrs: $1,
+// 424|      loc : mk_loc($loc)
+// 425|    }
+// 426|    ($4, fn_decl)
+// 427|  }
 
 ///|
 fn yy_action_87(
@@ -4835,6 +4966,12 @@ fn yy_action_87(
   let _end_pos_of_item8 = _args[9].2
   guard _sub_action_1_result is YYObj_Visibility(_dollar2)
   guard _sub_action_0_result is YYObj_List_Attribute_(_dollar1)
+  let _start_pos = if _args.length() == 0 { _last_pos } else { _args[0].1 }
+  let _end_pos = if _args.length() == 0 {
+    _last_pos
+  } else {
+    _args[_args.length() - 1].2
+  }
   guard _args[4].0 is YYObj_StringLiteral(_dollar4)
   YYObj__StringLiteral__FunDecl_(
     {
@@ -4854,6 +4991,7 @@ fn yy_action_87(
         vis: _dollar2,
         doc: DocString::empty(),
         attrs: _dollar1,
+        loc: mk_loc((_start_pos, _end_pos)),
       }
       (_dollar4, fn_decl)
     },
@@ -4861,22 +4999,22 @@ fn yy_action_87(
 }
 
 // file:///./parser.mbty
-// 477|    attributes visibility "extern" "type" UIDENT optional_type_parameters_no_constraints deriving_directive_list {
-// 478|    TopTypeDef(
-// 479|      TypeDecl::{
-// 480|        tycon : $5,
-// 481|        tycon_loc : mk_loc($loc($5)),
-// 482|        params : $6,
-// 483|        components: Extern,
-// 484|        type_vis : $2,
-// 485|        doc : DocString::empty(),
-// 486|        deriving: $7,
-// 487|        loc : mk_loc($sloc),
-// 488|        attrs : $1,
-// 489|        is_declare : false
-// 490|      }
-// 491|    )
-// 492|  }
+// 485|    attributes visibility "extern" "type" UIDENT optional_type_parameters_no_constraints deriving_directive_list {
+// 486|    TopTypeDef(
+// 487|      TypeDecl::{
+// 488|        tycon : $5,
+// 489|        tycon_loc : mk_loc($loc($5)),
+// 490|        params : $6,
+// 491|        components: Extern,
+// 492|        type_vis : $2,
+// 493|        doc : DocString::empty(),
+// 494|        deriving: $7,
+// 495|        loc : mk_loc($sloc),
+// 496|        attrs : $1,
+// 497|        is_declare : false
+// 498|      }
+// 499|    )
+// 500|  }
 
 ///|
 fn yy_action_88(
@@ -4918,7 +5056,7 @@ fn yy_action_88(
 }
 
 // file:///./parser.mbty
-// 451|    attributes is_declare visibility "let" binder opt_annot { ($1, false, $2, $3, $5, $6) }
+// 459|    attributes is_declare visibility "let" binder opt_annot { ($1, false, $2, $3, $5, $6) }
 
 ///|
 fn yy_action_89(
@@ -4944,7 +5082,7 @@ fn yy_action_89(
 }
 
 // file:///./parser.mbty
-// 451|    attributes is_declare visibility "let" binder opt_annot { ($1, false, $2, $3, $5, $6) }
+// 459|    attributes is_declare visibility "let" binder opt_annot { ($1, false, $2, $3, $5, $6) }
 
 ///|
 fn yy_action_90(
@@ -4970,7 +5108,7 @@ fn yy_action_90(
 }
 
 // file:///./parser.mbty
-// 452|    attributes is_declare visibility "const" UIDENT opt_annot { ($1, true, $2, $3, Binder::{ name : $5, loc : mk_loc($loc($5)) }, $6) }
+// 460|    attributes is_declare visibility "const" UIDENT opt_annot { ($1, true, $2, $3, Binder::{ name : $5, loc : mk_loc($loc($5)) }, $6) }
 
 ///|
 fn yy_action_91(
@@ -5007,7 +5145,7 @@ fn yy_action_91(
 }
 
 // file:///./parser.mbty
-// 452|    attributes is_declare visibility "const" UIDENT opt_annot { ($1, true, $2, $3, Binder::{ name : $5, loc : mk_loc($loc($5)) }, $6) }
+// 460|    attributes is_declare visibility "const" UIDENT opt_annot { ($1, true, $2, $3, Binder::{ name : $5, loc : mk_loc($loc($5)) }, $6) }
 
 ///|
 fn yy_action_92(
@@ -5044,19 +5182,19 @@ fn yy_action_92(
 }
 
 // file:///./parser.mbty
-// 676|    attributes visibility "fnalias" func_alias_targets {
-// 677|    let (pkg, type_name, is_list, targets) = $4
-// 678|    TopFuncAlias(
-// 679|      pkg~,
-// 680|      type_name~,
-// 681|      targets~,
-// 682|      vis = $2,
-// 683|      attrs = $1,
-// 684|      is_list~,
-// 685|      doc = DocString::empty(),
-// 686|      loc = mk_loc($sloc)
-// 687|    )
-// 688|  }
+// 685|    attributes visibility "fnalias" func_alias_targets {
+// 686|    let (pkg, type_name, is_list, targets) = $4
+// 687|    TopFuncAlias(
+// 688|      pkg~,
+// 689|      type_name~,
+// 690|      targets~,
+// 691|      vis = $2,
+// 692|      attrs = $1,
+// 693|      is_list~,
+// 694|      doc = DocString::empty(),
+// 695|      loc = mk_loc($sloc)
+// 696|    )
+// 697|  }
 
 ///|
 fn yy_action_93(
@@ -5093,25 +5231,25 @@ fn yy_action_93(
 }
 
 // file:///./parser.mbty
-// 689|    attributes is_declare visibility "trait" UIDENT option(preceded(COLON, separated_nonempty_list(PLUS, tvar_constraint))) "{" list_semis(trait_method_decl) "}" {
-// 690|    let name = Binder::{ name: $5, loc: mk_loc($loc($4)) }
-// 691|    let supers = match $6 {
-// 692|      None => @list.empty()
-// 693|      Some(supers) => supers
-// 694|    }
-// 695|    TopTrait(
-// 696|      TraitDecl::{
-// 697|        name,
-// 698|        supers,
-// 699|        methods: $8,
-// 700|        vis: $3,
-// 701|        loc: mk_loc($sloc),
-// 702|        attrs: $1,
-// 703|        doc : DocString::empty(),
-// 704|        is_declare : $2
-// 705|      }
-// 706|    )
-// 707|  }
+// 698|    attributes is_declare visibility "trait" UIDENT option(preceded(COLON, separated_nonempty_list(PLUS, tvar_constraint))) "{" list_semis(trait_method_decl) "}" {
+// 699|    let name = Binder::{ name: $5, loc: mk_loc($loc($4)) }
+// 700|    let supers = match $6 {
+// 701|      None => @list.empty()
+// 702|      Some(supers) => supers
+// 703|    }
+// 704|    TopTrait(
+// 705|      TraitDecl::{
+// 706|        name,
+// 707|        supers,
+// 708|        methods: $8,
+// 709|        vis: $3,
+// 710|        loc: mk_loc($sloc),
+// 711|        attrs: $1,
+// 712|        doc : DocString::empty(),
+// 713|        is_declare : $2
+// 714|      }
+// 715|    )
+// 716|  }
 
 ///|
 fn yy_action_94(
@@ -5161,18 +5299,18 @@ fn yy_action_94(
 }
 
 // file:///./parser.mbty
-// 708|    attributes visibility "typealias" batch_type_alias_targets {
-// 709|    let (is_list, pkg, targets) = $4
-// 710|    TopBatchTypeAlias(
-// 711|      pkg~,
-// 712|      targets~,
-// 713|      vis = $2,
-// 714|      attrs = $1,
-// 715|      is_list~,
-// 716|      doc = DocString::empty(),
-// 717|      loc = mk_loc($sloc)
-// 718|    )
-// 719|  }
+// 717|    attributes visibility "typealias" batch_type_alias_targets {
+// 718|    let (is_list, pkg, targets) = $4
+// 719|    TopBatchTypeAlias(
+// 720|      pkg~,
+// 721|      targets~,
+// 722|      vis = $2,
+// 723|      attrs = $1,
+// 724|      is_list~,
+// 725|      doc = DocString::empty(),
+// 726|      loc = mk_loc($sloc)
+// 727|    )
+// 728|  }
 
 ///|
 fn yy_action_95(
@@ -5208,22 +5346,22 @@ fn yy_action_95(
 }
 
 // file:///./parser.mbty
-// 720|    attributes visibility "typealias" type_ "as" UIDENT optional_type_parameters_no_constraints {
-// 721|    TopTypeDef(
-// 722|      TypeDecl::{
-// 723|        tycon : $6,
-// 724|        tycon_loc : mk_loc($loc($6)),
-// 725|        params : $7,
-// 726|        components: Alias($4),
-// 727|        type_vis : $2,
-// 728|        doc : DocString::empty(),
-// 729|        deriving: @list.empty(),
-// 730|        loc : mk_loc($sloc),
-// 731|        attrs : $1,
-// 732|        is_declare : false
-// 733|      }
-// 734|    )
-// 735|  }
+// 729|    attributes visibility "typealias" type_ "as" UIDENT optional_type_parameters_no_constraints {
+// 730|    TopTypeDef(
+// 731|      TypeDecl::{
+// 732|        tycon : $6,
+// 733|        tycon_loc : mk_loc($loc($6)),
+// 734|        params : $7,
+// 735|        components: Alias($4),
+// 736|        type_vis : $2,
+// 737|        doc : DocString::empty(),
+// 738|        deriving: @list.empty(),
+// 739|        loc : mk_loc($sloc),
+// 740|        attrs : $1,
+// 741|        is_declare : false
+// 742|      }
+// 743|    )
+// 744|  }
 
 ///|
 fn yy_action_96(
@@ -5265,18 +5403,18 @@ fn yy_action_96(
 }
 
 // file:///./parser.mbty
-// 753|    attributes visibility "traitalias" batch_type_alias_targets {
-// 754|    let (is_list, pkg, targets) = $4
-// 755|    TopBatchTraitAlias(
-// 756|      pkg~,
-// 757|      targets~,
-// 758|      vis = $2,
-// 759|      attrs = $1,
-// 760|      is_list~,
-// 761|      doc = DocString::empty(),
-// 762|      loc = mk_loc($sloc)
-// 763|    )
-// 764|  }
+// 762|    attributes visibility "traitalias" batch_type_alias_targets {
+// 763|    let (is_list, pkg, targets) = $4
+// 764|    TopBatchTraitAlias(
+// 765|      pkg~,
+// 766|      targets~,
+// 767|      vis = $2,
+// 768|      attrs = $1,
+// 769|      is_list~,
+// 770|      doc = DocString::empty(),
+// 771|      loc = mk_loc($sloc)
+// 772|    )
+// 773|  }
 
 ///|
 fn yy_action_97(
@@ -5312,24 +5450,24 @@ fn yy_action_97(
 }
 
 // file:///./parser.mbty
-// 778|    attributes visibility "impl" optional_type_parameters type_name "for" type_ "with" binder optional_bang parameters func_return_type impl_body {
-// 779|    let (ret_ty, err_ty) = $12
-// 780|    TopImpl(
-// 781|      self_ty = Some($7),
-// 782|      trait_ = $5,
-// 783|      method_name = $9,
-// 784|      has_error = $10,
-// 785|      quantifiers = $4,
-// 786|      params = $11,
-// 787|      ret_ty~,
-// 788|      err_ty~,
-// 789|      body = $13,
-// 790|      vis = $2,
-// 791|      loc = mk_loc($sloc),
-// 792|      attrs = $1,
-// 793|      doc = DocString::empty()
-// 794|    )
-// 795|  }
+// 787|    attributes visibility "impl" optional_type_parameters type_name "for" type_ "with" binder optional_bang parameters func_return_type impl_body {
+// 788|    let (ret_ty, err_ty) = $12
+// 789|    TopImpl(
+// 790|      self_ty = Some($7),
+// 791|      trait_ = $5,
+// 792|      method_name = $9,
+// 793|      has_error = $10,
+// 794|      quantifiers = $4,
+// 795|      params = $11,
+// 796|      ret_ty~,
+// 797|      err_ty~,
+// 798|      body = $13,
+// 799|      vis = $2,
+// 800|      loc = mk_loc($sloc),
+// 801|      attrs = $1,
+// 802|      doc = DocString::empty()
+// 803|    )
+// 804|  }
 
 ///|
 fn yy_action_98(
@@ -5379,18 +5517,18 @@ fn yy_action_98(
 }
 
 // file:///./parser.mbty
-// 814|    attributes is_declare visibility "impl" optional_type_parameters type_name "for" type_ {
-// 815|    TopImplRelation(
-// 816|      self_ty = $8,
-// 817|      trait_ = $6,
-// 818|      quantifiers = $5,
-// 819|      vis = $3,
-// 820|      attrs = $1,
-// 821|      loc = mk_loc($sloc),
-// 822|      doc = DocString::empty(),
-// 823|      is_declare = $2
-// 824|    )
-// 825|  }
+// 823|    attributes is_declare visibility "impl" optional_type_parameters type_name "for" type_ {
+// 824|    TopImplRelation(
+// 825|      self_ty = $8,
+// 826|      trait_ = $6,
+// 827|      quantifiers = $5,
+// 828|      vis = $3,
+// 829|      attrs = $1,
+// 830|      loc = mk_loc($sloc),
+// 831|      doc = DocString::empty(),
+// 832|      is_declare = $2
+// 833|    )
+// 834|  }
 
 ///|
 fn yy_action_99(
@@ -5430,24 +5568,24 @@ fn yy_action_99(
 }
 
 // file:///./parser.mbty
-// 796|    attributes visibility "impl" optional_type_parameters type_name "with" binder optional_bang parameters func_return_type impl_body {
-// 797|    let (ret_ty, err_ty) = $10
-// 798|    TopImpl(
-// 799|      self_ty = None,
-// 800|      trait_ = $5,
-// 801|      method_name = $7,
-// 802|      has_error = $8,
-// 803|      quantifiers = $4,
-// 804|      params = $9,
-// 805|      ret_ty~,
-// 806|      err_ty~,
-// 807|      body = $11,
-// 808|      vis = $2,
-// 809|      loc = mk_loc($sloc),
-// 810|      attrs = $1,
-// 811|      doc = DocString::empty()
-// 812|    )
-// 813|  }
+// 805|    attributes visibility "impl" optional_type_parameters type_name "with" binder optional_bang parameters func_return_type impl_body {
+// 806|    let (ret_ty, err_ty) = $10
+// 807|    TopImpl(
+// 808|      self_ty = None,
+// 809|      trait_ = $5,
+// 810|      method_name = $7,
+// 811|      has_error = $8,
+// 812|      quantifiers = $4,
+// 813|      params = $9,
+// 814|      ret_ty~,
+// 815|      err_ty~,
+// 816|      body = $11,
+// 817|      vis = $2,
+// 818|      loc = mk_loc($sloc),
+// 819|      attrs = $1,
+// 820|      doc = DocString::empty()
+// 821|    )
+// 822|  }
 
 ///|
 fn yy_action_100(
@@ -5496,23 +5634,23 @@ fn yy_action_100(
 }
 
 // file:///./parser.mbty
-// 826|    attributes visibility "enumview" optional_type_parameters UIDENT "{" list_semis(enum_constructor) "}" "for" type_ "with" binder parameters block_expr {
-// 827|    TopView(
-// 828|      quantifiers = $4,
-// 829|      source_ty = $10,
-// 830|      view_type_name = $5,
-// 831|      view_type_loc = mk_loc($loc($5)),
-// 832|      view_func_name = $12,
-// 833|      parameters = $13,
-// 834|      params_loc = mk_loc($loc($13)),
-// 835|      view_constrs = $7,
-// 836|      body = $14,
-// 837|      vis = $2,
-// 838|      loc = mk_loc($sloc),
-// 839|      attrs = $1,
-// 840|      doc = DocString::empty()
-// 841|    )
-// 842|  }
+// 835|    attributes visibility "enumview" optional_type_parameters UIDENT "{" list_semis(enum_constructor) "}" "for" type_ "with" binder parameters block_expr {
+// 836|    TopView(
+// 837|      quantifiers = $4,
+// 838|      source_ty = $10,
+// 839|      view_type_name = $5,
+// 840|      view_type_loc = mk_loc($loc($5)),
+// 841|      view_func_name = $12,
+// 842|      parameters = $13,
+// 843|      params_loc = mk_loc($loc($13)),
+// 844|      view_constrs = $7,
+// 845|      body = $14,
+// 846|      vis = $2,
+// 847|      loc = mk_loc($sloc),
+// 848|      attrs = $1,
+// 849|      doc = DocString::empty()
+// 850|    )
+// 851|  }
 
 ///|
 fn yy_action_101(
@@ -5564,19 +5702,19 @@ fn yy_action_101(
 }
 
 // file:///./parser.mbty
-// 843|    attributes visibility "using" PACKAGE_NAME "{" list_commas(using_binder) "}" {
-// 844|    TopUsing(
-// 845|      pkg = {
-// 846|        name : $4,
-// 847|        loc : mk_loc($loc($4))
-// 848|      },
-// 849|      names = $6,
-// 850|      vis = $2,
-// 851|      attrs = $1,
-// 852|      loc = mk_loc($loc),
-// 853|      doc = DocString::empty()
-// 854|    )
-// 855|  }
+// 852|    attributes visibility "using" PACKAGE_NAME "{" list_commas(using_binder) "}" {
+// 853|    TopUsing(
+// 854|      pkg = {
+// 855|        name : $4,
+// 856|        loc : mk_loc($loc($4))
+// 857|      },
+// 858|      names = $6,
+// 859|      vis = $2,
+// 860|      attrs = $1,
+// 861|      loc = mk_loc($loc),
+// 862|      doc = DocString::empty()
+// 863|    )
+// 864|  }
 
 ///|
 fn yy_action_102(
@@ -5616,9 +5754,9 @@ fn yy_action_102(
 }
 
 // file:///./parser.mbty
-// 884|    attributes is_declare visibility "type" UIDENT optional_type_parameters_no_constraints { 
-// 885|    ($1, $3, $2, $5, mk_loc($loc($5)), $6) 
-// 886|  }
+// 893|    attributes is_declare visibility "type" UIDENT optional_type_parameters_no_constraints { 
+// 894|    ($1, $3, $2, $5, mk_loc($loc($5)), $6) 
+// 895|  }
 
 ///|
 fn yy_action_103(
@@ -5651,7 +5789,7 @@ fn yy_action_103(
 }
 
 // file:///./parser.mbty
-// 890|    attributes is_declare visibility "suberror" UIDENT { ($1, $3, $2, $5, mk_loc($loc($5))) }
+// 899|    attributes is_declare visibility "suberror" UIDENT { ($1, $3, $2, $5, mk_loc($loc($5))) }
 
 ///|
 fn yy_action_104(
@@ -5682,9 +5820,9 @@ fn yy_action_104(
 }
 
 // file:///./parser.mbty
-// 894|    attributes visibility "struct" UIDENT optional_type_parameters_no_constraints { 
-// 895|    ($1, $2, $4, mk_loc($loc($4)), $5) 
-// 896|  }
+// 903|    attributes visibility "struct" UIDENT optional_type_parameters_no_constraints { 
+// 904|    ($1, $2, $4, mk_loc($loc($4)), $5) 
+// 905|  }
 
 ///|
 fn yy_action_105(
@@ -5714,9 +5852,9 @@ fn yy_action_105(
 }
 
 // file:///./parser.mbty
-// 900|    attributes visibility "enum" UIDENT optional_type_parameters_no_constraints { 
-// 901|    ($1, $2, $4, mk_loc($loc($4)), $5) 
-// 902|  }
+// 909|    attributes visibility "enum" UIDENT optional_type_parameters_no_constraints { 
+// 910|    ($1, $2, $4, mk_loc($loc($4)), $5) 
+// 911|  }
 
 ///|
 fn yy_action_106(
@@ -5746,24 +5884,25 @@ fn yy_action_106(
 }
 
 // file:///./parser.mbty
-// 341|    attributes "declare" visibility is_async fun_header_generic option(parameters) func_return_type {
-// 342|    let ((type_name, f), has_error, quants) = $5
-// 343|    let (return_type, error_type) = $7
-// 344|    FunDecl::{
-// 345|      type_name,
-// 346|      name: f,
-// 347|      has_error,
-// 348|      is_async : $4,
-// 349|      quantifiers: quants,
-// 350|      decl_params: $6,
-// 351|      params_loc: mk_loc($loc($6)),
-// 352|      return_type,
-// 353|      error_type,
-// 354|      vis: $3,
-// 355|      doc: DocString::empty(),
-// 356|      attrs: $1,
-// 357|    }
-// 358|  }
+// 347|    attributes "declare" visibility is_async fun_header_generic option(parameters) func_return_type {
+// 348|    let ((type_name, f), has_error, quants) = $5
+// 349|    let (return_type, error_type) = $7
+// 350|    FunDecl::{
+// 351|      type_name,
+// 352|      name: f,
+// 353|      has_error,
+// 354|      is_async : $4,
+// 355|      quantifiers: quants,
+// 356|      decl_params: $6,
+// 357|      params_loc: mk_loc($loc($6)),
+// 358|      return_type,
+// 359|      error_type,
+// 360|      vis: $3,
+// 361|      doc: DocString::empty(),
+// 362|      attrs: $1,
+// 363|      loc : mk_loc($loc)
+// 364|    }
+// 365|  }
 
 ///|
 fn yy_action_107(
@@ -5782,6 +5921,12 @@ fn yy_action_107(
   let _end_pos_of_item5 = _args[4].2
   guard _sub_action_1_result is YYObj_Visibility(_dollar3)
   guard _sub_action_0_result is YYObj_List_Attribute_(_dollar1)
+  let _start_pos = if _args.length() == 0 { _last_pos } else { _args[0].1 }
+  let _end_pos = if _args.length() == 0 {
+    _last_pos
+  } else {
+    _args[_args.length() - 1].2
+  }
   YYObj_FunDecl(
     {
       ()
@@ -5800,30 +5945,32 @@ fn yy_action_107(
         vis: _dollar3,
         doc: DocString::empty(),
         attrs: _dollar1,
+        loc: mk_loc((_start_pos, _end_pos)),
       }
     },
   )
 }
 
 // file:///./parser.mbty
-// 341|    attributes "declare" visibility is_async fun_header_generic option(parameters) func_return_type {
-// 342|    let ((type_name, f), has_error, quants) = $5
-// 343|    let (return_type, error_type) = $7
-// 344|    FunDecl::{
-// 345|      type_name,
-// 346|      name: f,
-// 347|      has_error,
-// 348|      is_async : $4,
-// 349|      quantifiers: quants,
-// 350|      decl_params: $6,
-// 351|      params_loc: mk_loc($loc($6)),
-// 352|      return_type,
-// 353|      error_type,
-// 354|      vis: $3,
-// 355|      doc: DocString::empty(),
-// 356|      attrs: $1,
-// 357|    }
-// 358|  }
+// 347|    attributes "declare" visibility is_async fun_header_generic option(parameters) func_return_type {
+// 348|    let ((type_name, f), has_error, quants) = $5
+// 349|    let (return_type, error_type) = $7
+// 350|    FunDecl::{
+// 351|      type_name,
+// 352|      name: f,
+// 353|      has_error,
+// 354|      is_async : $4,
+// 355|      quantifiers: quants,
+// 356|      decl_params: $6,
+// 357|      params_loc: mk_loc($loc($6)),
+// 358|      return_type,
+// 359|      error_type,
+// 360|      vis: $3,
+// 361|      doc: DocString::empty(),
+// 362|      attrs: $1,
+// 363|      loc : mk_loc($loc)
+// 364|    }
+// 365|  }
 
 ///|
 fn yy_action_108(
@@ -5842,6 +5989,12 @@ fn yy_action_108(
   let _end_pos_of_item5 = _args[3].2
   guard _sub_action_1_result is YYObj_Visibility(_dollar3)
   guard _sub_action_0_result is YYObj_List_Attribute_(_dollar1)
+  let _start_pos = if _args.length() == 0 { _last_pos } else { _args[0].1 }
+  let _end_pos = if _args.length() == 0 {
+    _last_pos
+  } else {
+    _args[_args.length() - 1].2
+  }
   YYObj_FunDecl(
     {
       ()
@@ -5860,30 +6013,32 @@ fn yy_action_108(
         vis: _dollar3,
         doc: DocString::empty(),
         attrs: _dollar1,
+        loc: mk_loc((_start_pos, _end_pos)),
       }
     },
   )
 }
 
 // file:///./parser.mbty
-// 341|    attributes "declare" visibility is_async fun_header_generic option(parameters) func_return_type {
-// 342|    let ((type_name, f), has_error, quants) = $5
-// 343|    let (return_type, error_type) = $7
-// 344|    FunDecl::{
-// 345|      type_name,
-// 346|      name: f,
-// 347|      has_error,
-// 348|      is_async : $4,
-// 349|      quantifiers: quants,
-// 350|      decl_params: $6,
-// 351|      params_loc: mk_loc($loc($6)),
-// 352|      return_type,
-// 353|      error_type,
-// 354|      vis: $3,
-// 355|      doc: DocString::empty(),
-// 356|      attrs: $1,
-// 357|    }
-// 358|  }
+// 347|    attributes "declare" visibility is_async fun_header_generic option(parameters) func_return_type {
+// 348|    let ((type_name, f), has_error, quants) = $5
+// 349|    let (return_type, error_type) = $7
+// 350|    FunDecl::{
+// 351|      type_name,
+// 352|      name: f,
+// 353|      has_error,
+// 354|      is_async : $4,
+// 355|      quantifiers: quants,
+// 356|      decl_params: $6,
+// 357|      params_loc: mk_loc($loc($6)),
+// 358|      return_type,
+// 359|      error_type,
+// 360|      vis: $3,
+// 361|      doc: DocString::empty(),
+// 362|      attrs: $1,
+// 363|      loc : mk_loc($loc)
+// 364|    }
+// 365|  }
 
 ///|
 fn yy_action_109(
@@ -5902,6 +6057,12 @@ fn yy_action_109(
   let _end_pos_of_item5 = _args[5].2
   guard _sub_action_1_result is YYObj_Visibility(_dollar3)
   guard _sub_action_0_result is YYObj_List_Attribute_(_dollar1)
+  let _start_pos = if _args.length() == 0 { _last_pos } else { _args[0].1 }
+  let _end_pos = if _args.length() == 0 {
+    _last_pos
+  } else {
+    _args[_args.length() - 1].2
+  }
   YYObj_FunDecl(
     {
       ()
@@ -5920,30 +6081,32 @@ fn yy_action_109(
         vis: _dollar3,
         doc: DocString::empty(),
         attrs: _dollar1,
+        loc: mk_loc((_start_pos, _end_pos)),
       }
     },
   )
 }
 
 // file:///./parser.mbty
-// 341|    attributes "declare" visibility is_async fun_header_generic option(parameters) func_return_type {
-// 342|    let ((type_name, f), has_error, quants) = $5
-// 343|    let (return_type, error_type) = $7
-// 344|    FunDecl::{
-// 345|      type_name,
-// 346|      name: f,
-// 347|      has_error,
-// 348|      is_async : $4,
-// 349|      quantifiers: quants,
-// 350|      decl_params: $6,
-// 351|      params_loc: mk_loc($loc($6)),
-// 352|      return_type,
-// 353|      error_type,
-// 354|      vis: $3,
-// 355|      doc: DocString::empty(),
-// 356|      attrs: $1,
-// 357|    }
-// 358|  }
+// 347|    attributes "declare" visibility is_async fun_header_generic option(parameters) func_return_type {
+// 348|    let ((type_name, f), has_error, quants) = $5
+// 349|    let (return_type, error_type) = $7
+// 350|    FunDecl::{
+// 351|      type_name,
+// 352|      name: f,
+// 353|      has_error,
+// 354|      is_async : $4,
+// 355|      quantifiers: quants,
+// 356|      decl_params: $6,
+// 357|      params_loc: mk_loc($loc($6)),
+// 358|      return_type,
+// 359|      error_type,
+// 360|      vis: $3,
+// 361|      doc: DocString::empty(),
+// 362|      attrs: $1,
+// 363|      loc : mk_loc($loc)
+// 364|    }
+// 365|  }
 
 ///|
 fn yy_action_110(
@@ -5962,6 +6125,12 @@ fn yy_action_110(
   let _end_pos_of_item5 = _args[4].2
   guard _sub_action_1_result is YYObj_Visibility(_dollar3)
   guard _sub_action_0_result is YYObj_List_Attribute_(_dollar1)
+  let _start_pos = if _args.length() == 0 { _last_pos } else { _args[0].1 }
+  let _end_pos = if _args.length() == 0 {
+    _last_pos
+  } else {
+    _args[_args.length() - 1].2
+  }
   YYObj_FunDecl(
     {
       ()
@@ -5980,13 +6149,14 @@ fn yy_action_110(
         vis: _dollar3,
         doc: DocString::empty(),
         attrs: _dollar1,
+        loc: mk_loc((_start_pos, _end_pos)),
       }
     },
   )
 }
 
 // file:///./parser.mbty
-// 451|    attributes is_declare visibility "let" binder opt_annot { ($1, false, $2, $3, $5, $6) }
+// 459|    attributes is_declare visibility "let" binder opt_annot { ($1, false, $2, $3, $5, $6) }
 
 ///|
 fn yy_action_111(
@@ -6012,7 +6182,7 @@ fn yy_action_111(
 }
 
 // file:///./parser.mbty
-// 451|    attributes is_declare visibility "let" binder opt_annot { ($1, false, $2, $3, $5, $6) }
+// 459|    attributes is_declare visibility "let" binder opt_annot { ($1, false, $2, $3, $5, $6) }
 
 ///|
 fn yy_action_113(
@@ -6038,7 +6208,7 @@ fn yy_action_113(
 }
 
 // file:///./parser.mbty
-// 452|    attributes is_declare visibility "const" UIDENT opt_annot { ($1, true, $2, $3, Binder::{ name : $5, loc : mk_loc($loc($5)) }, $6) }
+// 460|    attributes is_declare visibility "const" UIDENT opt_annot { ($1, true, $2, $3, Binder::{ name : $5, loc : mk_loc($loc($5)) }, $6) }
 
 ///|
 fn yy_action_114(
@@ -6075,7 +6245,7 @@ fn yy_action_114(
 }
 
 // file:///./parser.mbty
-// 452|    attributes is_declare visibility "const" UIDENT opt_annot { ($1, true, $2, $3, Binder::{ name : $5, loc : mk_loc($loc($5)) }, $6) }
+// 460|    attributes is_declare visibility "const" UIDENT opt_annot { ($1, true, $2, $3, Binder::{ name : $5, loc : mk_loc($loc($5)) }, $6) }
 
 ///|
 fn yy_action_115(
@@ -6112,25 +6282,25 @@ fn yy_action_115(
 }
 
 // file:///./parser.mbty
-// 689|    attributes is_declare visibility "trait" UIDENT option(preceded(COLON, separated_nonempty_list(PLUS, tvar_constraint))) "{" list_semis(trait_method_decl) "}" {
-// 690|    let name = Binder::{ name: $5, loc: mk_loc($loc($4)) }
-// 691|    let supers = match $6 {
-// 692|      None => @list.empty()
-// 693|      Some(supers) => supers
-// 694|    }
-// 695|    TopTrait(
-// 696|      TraitDecl::{
-// 697|        name,
-// 698|        supers,
-// 699|        methods: $8,
-// 700|        vis: $3,
-// 701|        loc: mk_loc($sloc),
-// 702|        attrs: $1,
-// 703|        doc : DocString::empty(),
-// 704|        is_declare : $2
-// 705|      }
-// 706|    )
-// 707|  }
+// 698|    attributes is_declare visibility "trait" UIDENT option(preceded(COLON, separated_nonempty_list(PLUS, tvar_constraint))) "{" list_semis(trait_method_decl) "}" {
+// 699|    let name = Binder::{ name: $5, loc: mk_loc($loc($4)) }
+// 700|    let supers = match $6 {
+// 701|      None => @list.empty()
+// 702|      Some(supers) => supers
+// 703|    }
+// 704|    TopTrait(
+// 705|      TraitDecl::{
+// 706|        name,
+// 707|        supers,
+// 708|        methods: $8,
+// 709|        vis: $3,
+// 710|        loc: mk_loc($sloc),
+// 711|        attrs: $1,
+// 712|        doc : DocString::empty(),
+// 713|        is_declare : $2
+// 714|      }
+// 715|    )
+// 716|  }
 
 ///|
 fn yy_action_116(
@@ -6180,18 +6350,18 @@ fn yy_action_116(
 }
 
 // file:///./parser.mbty
-// 814|    attributes is_declare visibility "impl" optional_type_parameters type_name "for" type_ {
-// 815|    TopImplRelation(
-// 816|      self_ty = $8,
-// 817|      trait_ = $6,
-// 818|      quantifiers = $5,
-// 819|      vis = $3,
-// 820|      attrs = $1,
-// 821|      loc = mk_loc($sloc),
-// 822|      doc = DocString::empty(),
-// 823|      is_declare = $2
-// 824|    )
-// 825|  }
+// 823|    attributes is_declare visibility "impl" optional_type_parameters type_name "for" type_ {
+// 824|    TopImplRelation(
+// 825|      self_ty = $8,
+// 826|      trait_ = $6,
+// 827|      quantifiers = $5,
+// 828|      vis = $3,
+// 829|      attrs = $1,
+// 830|      loc = mk_loc($sloc),
+// 831|      doc = DocString::empty(),
+// 832|      is_declare = $2
+// 833|    )
+// 834|  }
 
 ///|
 fn yy_action_117(
@@ -6231,9 +6401,9 @@ fn yy_action_117(
 }
 
 // file:///./parser.mbty
-// 884|    attributes is_declare visibility "type" UIDENT optional_type_parameters_no_constraints { 
-// 885|    ($1, $3, $2, $5, mk_loc($loc($5)), $6) 
-// 886|  }
+// 893|    attributes is_declare visibility "type" UIDENT optional_type_parameters_no_constraints { 
+// 894|    ($1, $3, $2, $5, mk_loc($loc($5)), $6) 
+// 895|  }
 
 ///|
 fn yy_action_118(
@@ -6266,7 +6436,7 @@ fn yy_action_118(
 }
 
 // file:///./parser.mbty
-// 890|    attributes is_declare visibility "suberror" UIDENT { ($1, $3, $2, $5, mk_loc($loc($5))) }
+// 899|    attributes is_declare visibility "suberror" UIDENT { ($1, $3, $2, $5, mk_loc($loc($5))) }
 
 ///|
 fn yy_action_119(
@@ -6297,24 +6467,25 @@ fn yy_action_119(
 }
 
 // file:///./parser.mbty
-// 341|    attributes "declare" visibility is_async fun_header_generic option(parameters) func_return_type {
-// 342|    let ((type_name, f), has_error, quants) = $5
-// 343|    let (return_type, error_type) = $7
-// 344|    FunDecl::{
-// 345|      type_name,
-// 346|      name: f,
-// 347|      has_error,
-// 348|      is_async : $4,
-// 349|      quantifiers: quants,
-// 350|      decl_params: $6,
-// 351|      params_loc: mk_loc($loc($6)),
-// 352|      return_type,
-// 353|      error_type,
-// 354|      vis: $3,
-// 355|      doc: DocString::empty(),
-// 356|      attrs: $1,
-// 357|    }
-// 358|  }
+// 347|    attributes "declare" visibility is_async fun_header_generic option(parameters) func_return_type {
+// 348|    let ((type_name, f), has_error, quants) = $5
+// 349|    let (return_type, error_type) = $7
+// 350|    FunDecl::{
+// 351|      type_name,
+// 352|      name: f,
+// 353|      has_error,
+// 354|      is_async : $4,
+// 355|      quantifiers: quants,
+// 356|      decl_params: $6,
+// 357|      params_loc: mk_loc($loc($6)),
+// 358|      return_type,
+// 359|      error_type,
+// 360|      vis: $3,
+// 361|      doc: DocString::empty(),
+// 362|      attrs: $1,
+// 363|      loc : mk_loc($loc)
+// 364|    }
+// 365|  }
 
 ///|
 fn yy_action_120(
@@ -6333,6 +6504,12 @@ fn yy_action_120(
   let _end_pos_of_item5 = _args[6].2
   guard _sub_action_1_result is YYObj_Visibility(_dollar3)
   guard _sub_action_0_result is YYObj_List_Attribute_(_dollar1)
+  let _start_pos = if _args.length() == 0 { _last_pos } else { _args[0].1 }
+  let _end_pos = if _args.length() == 0 {
+    _last_pos
+  } else {
+    _args[_args.length() - 1].2
+  }
   YYObj_FunDecl(
     {
       ()
@@ -6351,30 +6528,32 @@ fn yy_action_120(
         vis: _dollar3,
         doc: DocString::empty(),
         attrs: _dollar1,
+        loc: mk_loc((_start_pos, _end_pos)),
       }
     },
   )
 }
 
 // file:///./parser.mbty
-// 341|    attributes "declare" visibility is_async fun_header_generic option(parameters) func_return_type {
-// 342|    let ((type_name, f), has_error, quants) = $5
-// 343|    let (return_type, error_type) = $7
-// 344|    FunDecl::{
-// 345|      type_name,
-// 346|      name: f,
-// 347|      has_error,
-// 348|      is_async : $4,
-// 349|      quantifiers: quants,
-// 350|      decl_params: $6,
-// 351|      params_loc: mk_loc($loc($6)),
-// 352|      return_type,
-// 353|      error_type,
-// 354|      vis: $3,
-// 355|      doc: DocString::empty(),
-// 356|      attrs: $1,
-// 357|    }
-// 358|  }
+// 347|    attributes "declare" visibility is_async fun_header_generic option(parameters) func_return_type {
+// 348|    let ((type_name, f), has_error, quants) = $5
+// 349|    let (return_type, error_type) = $7
+// 350|    FunDecl::{
+// 351|      type_name,
+// 352|      name: f,
+// 353|      has_error,
+// 354|      is_async : $4,
+// 355|      quantifiers: quants,
+// 356|      decl_params: $6,
+// 357|      params_loc: mk_loc($loc($6)),
+// 358|      return_type,
+// 359|      error_type,
+// 360|      vis: $3,
+// 361|      doc: DocString::empty(),
+// 362|      attrs: $1,
+// 363|      loc : mk_loc($loc)
+// 364|    }
+// 365|  }
 
 ///|
 fn yy_action_121(
@@ -6393,6 +6572,12 @@ fn yy_action_121(
   let _end_pos_of_item5 = _args[5].2
   guard _sub_action_1_result is YYObj_Visibility(_dollar3)
   guard _sub_action_0_result is YYObj_List_Attribute_(_dollar1)
+  let _start_pos = if _args.length() == 0 { _last_pos } else { _args[0].1 }
+  let _end_pos = if _args.length() == 0 {
+    _last_pos
+  } else {
+    _args[_args.length() - 1].2
+  }
   YYObj_FunDecl(
     {
       ()
@@ -6411,13 +6596,14 @@ fn yy_action_121(
         vis: _dollar3,
         doc: DocString::empty(),
         attrs: _dollar1,
+        loc: mk_loc((_start_pos, _end_pos)),
       }
     },
   )
 }
 
 // file:///./parser.mbty
-// 451|    attributes is_declare visibility "let" binder opt_annot { ($1, false, $2, $3, $5, $6) }
+// 459|    attributes is_declare visibility "let" binder opt_annot { ($1, false, $2, $3, $5, $6) }
 
 ///|
 fn yy_action_122(
@@ -6443,7 +6629,7 @@ fn yy_action_122(
 }
 
 // file:///./parser.mbty
-// 451|    attributes is_declare visibility "let" binder opt_annot { ($1, false, $2, $3, $5, $6) }
+// 459|    attributes is_declare visibility "let" binder opt_annot { ($1, false, $2, $3, $5, $6) }
 
 ///|
 fn yy_action_123(
@@ -6469,7 +6655,7 @@ fn yy_action_123(
 }
 
 // file:///./parser.mbty
-// 452|    attributes is_declare visibility "const" UIDENT opt_annot { ($1, true, $2, $3, Binder::{ name : $5, loc : mk_loc($loc($5)) }, $6) }
+// 460|    attributes is_declare visibility "const" UIDENT opt_annot { ($1, true, $2, $3, Binder::{ name : $5, loc : mk_loc($loc($5)) }, $6) }
 
 ///|
 fn yy_action_124(
@@ -6506,7 +6692,7 @@ fn yy_action_124(
 }
 
 // file:///./parser.mbty
-// 452|    attributes is_declare visibility "const" UIDENT opt_annot { ($1, true, $2, $3, Binder::{ name : $5, loc : mk_loc($loc($5)) }, $6) }
+// 460|    attributes is_declare visibility "const" UIDENT opt_annot { ($1, true, $2, $3, Binder::{ name : $5, loc : mk_loc($loc($5)) }, $6) }
 
 ///|
 fn yy_action_125(
@@ -6543,25 +6729,25 @@ fn yy_action_125(
 }
 
 // file:///./parser.mbty
-// 689|    attributes is_declare visibility "trait" UIDENT option(preceded(COLON, separated_nonempty_list(PLUS, tvar_constraint))) "{" list_semis(trait_method_decl) "}" {
-// 690|    let name = Binder::{ name: $5, loc: mk_loc($loc($4)) }
-// 691|    let supers = match $6 {
-// 692|      None => @list.empty()
-// 693|      Some(supers) => supers
-// 694|    }
-// 695|    TopTrait(
-// 696|      TraitDecl::{
-// 697|        name,
-// 698|        supers,
-// 699|        methods: $8,
-// 700|        vis: $3,
-// 701|        loc: mk_loc($sloc),
-// 702|        attrs: $1,
-// 703|        doc : DocString::empty(),
-// 704|        is_declare : $2
-// 705|      }
-// 706|    )
-// 707|  }
+// 698|    attributes is_declare visibility "trait" UIDENT option(preceded(COLON, separated_nonempty_list(PLUS, tvar_constraint))) "{" list_semis(trait_method_decl) "}" {
+// 699|    let name = Binder::{ name: $5, loc: mk_loc($loc($4)) }
+// 700|    let supers = match $6 {
+// 701|      None => @list.empty()
+// 702|      Some(supers) => supers
+// 703|    }
+// 704|    TopTrait(
+// 705|      TraitDecl::{
+// 706|        name,
+// 707|        supers,
+// 708|        methods: $8,
+// 709|        vis: $3,
+// 710|        loc: mk_loc($sloc),
+// 711|        attrs: $1,
+// 712|        doc : DocString::empty(),
+// 713|        is_declare : $2
+// 714|      }
+// 715|    )
+// 716|  }
 
 ///|
 fn yy_action_126(
@@ -6611,18 +6797,18 @@ fn yy_action_126(
 }
 
 // file:///./parser.mbty
-// 814|    attributes is_declare visibility "impl" optional_type_parameters type_name "for" type_ {
-// 815|    TopImplRelation(
-// 816|      self_ty = $8,
-// 817|      trait_ = $6,
-// 818|      quantifiers = $5,
-// 819|      vis = $3,
-// 820|      attrs = $1,
-// 821|      loc = mk_loc($sloc),
-// 822|      doc = DocString::empty(),
-// 823|      is_declare = $2
-// 824|    )
-// 825|  }
+// 823|    attributes is_declare visibility "impl" optional_type_parameters type_name "for" type_ {
+// 824|    TopImplRelation(
+// 825|      self_ty = $8,
+// 826|      trait_ = $6,
+// 827|      quantifiers = $5,
+// 828|      vis = $3,
+// 829|      attrs = $1,
+// 830|      loc = mk_loc($sloc),
+// 831|      doc = DocString::empty(),
+// 832|      is_declare = $2
+// 833|    )
+// 834|  }
 
 ///|
 fn yy_action_127(
@@ -6662,9 +6848,9 @@ fn yy_action_127(
 }
 
 // file:///./parser.mbty
-// 884|    attributes is_declare visibility "type" UIDENT optional_type_parameters_no_constraints { 
-// 885|    ($1, $3, $2, $5, mk_loc($loc($5)), $6) 
-// 886|  }
+// 893|    attributes is_declare visibility "type" UIDENT optional_type_parameters_no_constraints { 
+// 894|    ($1, $3, $2, $5, mk_loc($loc($5)), $6) 
+// 895|  }
 
 ///|
 fn yy_action_128(
@@ -6697,7 +6883,7 @@ fn yy_action_128(
 }
 
 // file:///./parser.mbty
-// 890|    attributes is_declare visibility "suberror" UIDENT { ($1, $3, $2, $5, mk_loc($loc($5))) }
+// 899|    attributes is_declare visibility "suberror" UIDENT { ($1, $3, $2, $5, mk_loc($loc($5))) }
 
 ///|
 fn yy_action_129(
@@ -6728,7 +6914,7 @@ fn yy_action_129(
 }
 
 // file:///./parser.mbty
-// 451|    attributes is_declare visibility "let" binder opt_annot { ($1, false, $2, $3, $5, $6) }
+// 459|    attributes is_declare visibility "let" binder opt_annot { ($1, false, $2, $3, $5, $6) }
 
 ///|
 fn yy_action_130(
@@ -6754,7 +6940,7 @@ fn yy_action_130(
 }
 
 // file:///./parser.mbty
-// 451|    attributes is_declare visibility "let" binder opt_annot { ($1, false, $2, $3, $5, $6) }
+// 459|    attributes is_declare visibility "let" binder opt_annot { ($1, false, $2, $3, $5, $6) }
 
 ///|
 fn yy_action_131(
@@ -6780,7 +6966,7 @@ fn yy_action_131(
 }
 
 // file:///./parser.mbty
-// 452|    attributes is_declare visibility "const" UIDENT opt_annot { ($1, true, $2, $3, Binder::{ name : $5, loc : mk_loc($loc($5)) }, $6) }
+// 460|    attributes is_declare visibility "const" UIDENT opt_annot { ($1, true, $2, $3, Binder::{ name : $5, loc : mk_loc($loc($5)) }, $6) }
 
 ///|
 fn yy_action_132(
@@ -6817,7 +7003,7 @@ fn yy_action_132(
 }
 
 // file:///./parser.mbty
-// 452|    attributes is_declare visibility "const" UIDENT opt_annot { ($1, true, $2, $3, Binder::{ name : $5, loc : mk_loc($loc($5)) }, $6) }
+// 460|    attributes is_declare visibility "const" UIDENT opt_annot { ($1, true, $2, $3, Binder::{ name : $5, loc : mk_loc($loc($5)) }, $6) }
 
 ///|
 fn yy_action_133(
@@ -6854,25 +7040,25 @@ fn yy_action_133(
 }
 
 // file:///./parser.mbty
-// 689|    attributes is_declare visibility "trait" UIDENT option(preceded(COLON, separated_nonempty_list(PLUS, tvar_constraint))) "{" list_semis(trait_method_decl) "}" {
-// 690|    let name = Binder::{ name: $5, loc: mk_loc($loc($4)) }
-// 691|    let supers = match $6 {
-// 692|      None => @list.empty()
-// 693|      Some(supers) => supers
-// 694|    }
-// 695|    TopTrait(
-// 696|      TraitDecl::{
-// 697|        name,
-// 698|        supers,
-// 699|        methods: $8,
-// 700|        vis: $3,
-// 701|        loc: mk_loc($sloc),
-// 702|        attrs: $1,
-// 703|        doc : DocString::empty(),
-// 704|        is_declare : $2
-// 705|      }
-// 706|    )
-// 707|  }
+// 698|    attributes is_declare visibility "trait" UIDENT option(preceded(COLON, separated_nonempty_list(PLUS, tvar_constraint))) "{" list_semis(trait_method_decl) "}" {
+// 699|    let name = Binder::{ name: $5, loc: mk_loc($loc($4)) }
+// 700|    let supers = match $6 {
+// 701|      None => @list.empty()
+// 702|      Some(supers) => supers
+// 703|    }
+// 704|    TopTrait(
+// 705|      TraitDecl::{
+// 706|        name,
+// 707|        supers,
+// 708|        methods: $8,
+// 709|        vis: $3,
+// 710|        loc: mk_loc($sloc),
+// 711|        attrs: $1,
+// 712|        doc : DocString::empty(),
+// 713|        is_declare : $2
+// 714|      }
+// 715|    )
+// 716|  }
 
 ///|
 fn yy_action_134(
@@ -6922,18 +7108,18 @@ fn yy_action_134(
 }
 
 // file:///./parser.mbty
-// 814|    attributes is_declare visibility "impl" optional_type_parameters type_name "for" type_ {
-// 815|    TopImplRelation(
-// 816|      self_ty = $8,
-// 817|      trait_ = $6,
-// 818|      quantifiers = $5,
-// 819|      vis = $3,
-// 820|      attrs = $1,
-// 821|      loc = mk_loc($sloc),
-// 822|      doc = DocString::empty(),
-// 823|      is_declare = $2
-// 824|    )
-// 825|  }
+// 823|    attributes is_declare visibility "impl" optional_type_parameters type_name "for" type_ {
+// 824|    TopImplRelation(
+// 825|      self_ty = $8,
+// 826|      trait_ = $6,
+// 827|      quantifiers = $5,
+// 828|      vis = $3,
+// 829|      attrs = $1,
+// 830|      loc = mk_loc($sloc),
+// 831|      doc = DocString::empty(),
+// 832|      is_declare = $2
+// 833|    )
+// 834|  }
 
 ///|
 fn yy_action_135(
@@ -6973,9 +7159,9 @@ fn yy_action_135(
 }
 
 // file:///./parser.mbty
-// 884|    attributes is_declare visibility "type" UIDENT optional_type_parameters_no_constraints { 
-// 885|    ($1, $3, $2, $5, mk_loc($loc($5)), $6) 
-// 886|  }
+// 893|    attributes is_declare visibility "type" UIDENT optional_type_parameters_no_constraints { 
+// 894|    ($1, $3, $2, $5, mk_loc($loc($5)), $6) 
+// 895|  }
 
 ///|
 fn yy_action_136(
@@ -7008,7 +7194,7 @@ fn yy_action_136(
 }
 
 // file:///./parser.mbty
-// 890|    attributes is_declare visibility "suberror" UIDENT { ($1, $3, $2, $5, mk_loc($loc($5))) }
+// 899|    attributes is_declare visibility "suberror" UIDENT { ($1, $3, $2, $5, mk_loc($loc($5))) }
 
 ///|
 fn yy_action_137(
@@ -7039,25 +7225,26 @@ fn yy_action_137(
 }
 
 // file:///./parser.mbty
-// 401|    attributes visibility "extern" STRING "fn" fun_binder optional_bang optional_type_parameters option(parameters) func_return_type {
-// 402|    let (type_name, f) = $6
-// 403|    let (return_type, error_type) = $10
-// 404|    let fn_decl = FunDecl::{
-// 405|      type_name,
-// 406|      name: f,
-// 407|      has_error : $7,
-// 408|      is_async : None,
-// 409|      quantifiers: $8,
-// 410|      decl_params: $9,
-// 411|      params_loc: mk_loc($loc($9)),
-// 412|      return_type,
-// 413|      error_type,
-// 414|      vis: $2,
-// 415|      doc: DocString::empty(),
-// 416|      attrs: $1,
-// 417|    }
-// 418|    ($4, fn_decl)
-// 419|  }
+// 408|    attributes visibility "extern" STRING "fn" fun_binder optional_bang optional_type_parameters option(parameters) func_return_type {
+// 409|    let (type_name, f) = $6
+// 410|    let (return_type, error_type) = $10
+// 411|    let fn_decl = FunDecl::{
+// 412|      type_name,
+// 413|      name: f,
+// 414|      has_error : $7,
+// 415|      is_async : None,
+// 416|      quantifiers: $8,
+// 417|      decl_params: $9,
+// 418|      params_loc: mk_loc($loc($9)),
+// 419|      return_type,
+// 420|      error_type,
+// 421|      vis: $2,
+// 422|      doc: DocString::empty(),
+// 423|      attrs: $1,
+// 424|      loc : mk_loc($loc)
+// 425|    }
+// 426|    ($4, fn_decl)
+// 427|  }
 
 ///|
 fn yy_action_138(
@@ -7075,6 +7262,12 @@ fn yy_action_138(
   let _end_pos_of_item8 = _args[7].2
   guard _sub_action_1_result is YYObj_Visibility(_dollar2)
   guard _sub_action_0_result is YYObj_List_Attribute_(_dollar1)
+  let _start_pos = if _args.length() == 0 { _last_pos } else { _args[0].1 }
+  let _end_pos = if _args.length() == 0 {
+    _last_pos
+  } else {
+    _args[_args.length() - 1].2
+  }
   guard _args[2].0 is YYObj_StringLiteral(_dollar4)
   YYObj__StringLiteral__FunDecl_(
     {
@@ -7094,6 +7287,7 @@ fn yy_action_138(
         vis: _dollar2,
         doc: DocString::empty(),
         attrs: _dollar1,
+        loc: mk_loc((_start_pos, _end_pos)),
       }
       (_dollar4, fn_decl)
     },
@@ -7101,22 +7295,22 @@ fn yy_action_138(
 }
 
 // file:///./parser.mbty
-// 477|    attributes visibility "extern" "type" UIDENT optional_type_parameters_no_constraints deriving_directive_list {
-// 478|    TopTypeDef(
-// 479|      TypeDecl::{
-// 480|        tycon : $5,
-// 481|        tycon_loc : mk_loc($loc($5)),
-// 482|        params : $6,
-// 483|        components: Extern,
-// 484|        type_vis : $2,
-// 485|        doc : DocString::empty(),
-// 486|        deriving: $7,
-// 487|        loc : mk_loc($sloc),
-// 488|        attrs : $1,
-// 489|        is_declare : false
-// 490|      }
-// 491|    )
-// 492|  }
+// 485|    attributes visibility "extern" "type" UIDENT optional_type_parameters_no_constraints deriving_directive_list {
+// 486|    TopTypeDef(
+// 487|      TypeDecl::{
+// 488|        tycon : $5,
+// 489|        tycon_loc : mk_loc($loc($5)),
+// 490|        params : $6,
+// 491|        components: Extern,
+// 492|        type_vis : $2,
+// 493|        doc : DocString::empty(),
+// 494|        deriving: $7,
+// 495|        loc : mk_loc($sloc),
+// 496|        attrs : $1,
+// 497|        is_declare : false
+// 498|      }
+// 499|    )
+// 500|  }
 
 ///|
 fn yy_action_139(
@@ -7158,7 +7352,7 @@ fn yy_action_139(
 }
 
 // file:///./parser.mbty
-// 451|    attributes is_declare visibility "let" binder opt_annot { ($1, false, $2, $3, $5, $6) }
+// 459|    attributes is_declare visibility "let" binder opt_annot { ($1, false, $2, $3, $5, $6) }
 
 ///|
 fn yy_action_140(
@@ -7184,7 +7378,7 @@ fn yy_action_140(
 }
 
 // file:///./parser.mbty
-// 451|    attributes is_declare visibility "let" binder opt_annot { ($1, false, $2, $3, $5, $6) }
+// 459|    attributes is_declare visibility "let" binder opt_annot { ($1, false, $2, $3, $5, $6) }
 
 ///|
 fn yy_action_141(
@@ -7210,7 +7404,7 @@ fn yy_action_141(
 }
 
 // file:///./parser.mbty
-// 452|    attributes is_declare visibility "const" UIDENT opt_annot { ($1, true, $2, $3, Binder::{ name : $5, loc : mk_loc($loc($5)) }, $6) }
+// 460|    attributes is_declare visibility "const" UIDENT opt_annot { ($1, true, $2, $3, Binder::{ name : $5, loc : mk_loc($loc($5)) }, $6) }
 
 ///|
 fn yy_action_142(
@@ -7247,7 +7441,7 @@ fn yy_action_142(
 }
 
 // file:///./parser.mbty
-// 452|    attributes is_declare visibility "const" UIDENT opt_annot { ($1, true, $2, $3, Binder::{ name : $5, loc : mk_loc($loc($5)) }, $6) }
+// 460|    attributes is_declare visibility "const" UIDENT opt_annot { ($1, true, $2, $3, Binder::{ name : $5, loc : mk_loc($loc($5)) }, $6) }
 
 ///|
 fn yy_action_143(
@@ -7284,19 +7478,19 @@ fn yy_action_143(
 }
 
 // file:///./parser.mbty
-// 676|    attributes visibility "fnalias" func_alias_targets {
-// 677|    let (pkg, type_name, is_list, targets) = $4
-// 678|    TopFuncAlias(
-// 679|      pkg~,
-// 680|      type_name~,
-// 681|      targets~,
-// 682|      vis = $2,
-// 683|      attrs = $1,
-// 684|      is_list~,
-// 685|      doc = DocString::empty(),
-// 686|      loc = mk_loc($sloc)
-// 687|    )
-// 688|  }
+// 685|    attributes visibility "fnalias" func_alias_targets {
+// 686|    let (pkg, type_name, is_list, targets) = $4
+// 687|    TopFuncAlias(
+// 688|      pkg~,
+// 689|      type_name~,
+// 690|      targets~,
+// 691|      vis = $2,
+// 692|      attrs = $1,
+// 693|      is_list~,
+// 694|      doc = DocString::empty(),
+// 695|      loc = mk_loc($sloc)
+// 696|    )
+// 697|  }
 
 ///|
 fn yy_action_144(
@@ -7333,25 +7527,25 @@ fn yy_action_144(
 }
 
 // file:///./parser.mbty
-// 689|    attributes is_declare visibility "trait" UIDENT option(preceded(COLON, separated_nonempty_list(PLUS, tvar_constraint))) "{" list_semis(trait_method_decl) "}" {
-// 690|    let name = Binder::{ name: $5, loc: mk_loc($loc($4)) }
-// 691|    let supers = match $6 {
-// 692|      None => @list.empty()
-// 693|      Some(supers) => supers
-// 694|    }
-// 695|    TopTrait(
-// 696|      TraitDecl::{
-// 697|        name,
-// 698|        supers,
-// 699|        methods: $8,
-// 700|        vis: $3,
-// 701|        loc: mk_loc($sloc),
-// 702|        attrs: $1,
-// 703|        doc : DocString::empty(),
-// 704|        is_declare : $2
-// 705|      }
-// 706|    )
-// 707|  }
+// 698|    attributes is_declare visibility "trait" UIDENT option(preceded(COLON, separated_nonempty_list(PLUS, tvar_constraint))) "{" list_semis(trait_method_decl) "}" {
+// 699|    let name = Binder::{ name: $5, loc: mk_loc($loc($4)) }
+// 700|    let supers = match $6 {
+// 701|      None => @list.empty()
+// 702|      Some(supers) => supers
+// 703|    }
+// 704|    TopTrait(
+// 705|      TraitDecl::{
+// 706|        name,
+// 707|        supers,
+// 708|        methods: $8,
+// 709|        vis: $3,
+// 710|        loc: mk_loc($sloc),
+// 711|        attrs: $1,
+// 712|        doc : DocString::empty(),
+// 713|        is_declare : $2
+// 714|      }
+// 715|    )
+// 716|  }
 
 ///|
 fn yy_action_145(
@@ -7401,18 +7595,18 @@ fn yy_action_145(
 }
 
 // file:///./parser.mbty
-// 708|    attributes visibility "typealias" batch_type_alias_targets {
-// 709|    let (is_list, pkg, targets) = $4
-// 710|    TopBatchTypeAlias(
-// 711|      pkg~,
-// 712|      targets~,
-// 713|      vis = $2,
-// 714|      attrs = $1,
-// 715|      is_list~,
-// 716|      doc = DocString::empty(),
-// 717|      loc = mk_loc($sloc)
-// 718|    )
-// 719|  }
+// 717|    attributes visibility "typealias" batch_type_alias_targets {
+// 718|    let (is_list, pkg, targets) = $4
+// 719|    TopBatchTypeAlias(
+// 720|      pkg~,
+// 721|      targets~,
+// 722|      vis = $2,
+// 723|      attrs = $1,
+// 724|      is_list~,
+// 725|      doc = DocString::empty(),
+// 726|      loc = mk_loc($sloc)
+// 727|    )
+// 728|  }
 
 ///|
 fn yy_action_146(
@@ -7448,22 +7642,22 @@ fn yy_action_146(
 }
 
 // file:///./parser.mbty
-// 720|    attributes visibility "typealias" type_ "as" UIDENT optional_type_parameters_no_constraints {
-// 721|    TopTypeDef(
-// 722|      TypeDecl::{
-// 723|        tycon : $6,
-// 724|        tycon_loc : mk_loc($loc($6)),
-// 725|        params : $7,
-// 726|        components: Alias($4),
-// 727|        type_vis : $2,
-// 728|        doc : DocString::empty(),
-// 729|        deriving: @list.empty(),
-// 730|        loc : mk_loc($sloc),
-// 731|        attrs : $1,
-// 732|        is_declare : false
-// 733|      }
-// 734|    )
-// 735|  }
+// 729|    attributes visibility "typealias" type_ "as" UIDENT optional_type_parameters_no_constraints {
+// 730|    TopTypeDef(
+// 731|      TypeDecl::{
+// 732|        tycon : $6,
+// 733|        tycon_loc : mk_loc($loc($6)),
+// 734|        params : $7,
+// 735|        components: Alias($4),
+// 736|        type_vis : $2,
+// 737|        doc : DocString::empty(),
+// 738|        deriving: @list.empty(),
+// 739|        loc : mk_loc($sloc),
+// 740|        attrs : $1,
+// 741|        is_declare : false
+// 742|      }
+// 743|    )
+// 744|  }
 
 ///|
 fn yy_action_147(
@@ -7505,18 +7699,18 @@ fn yy_action_147(
 }
 
 // file:///./parser.mbty
-// 753|    attributes visibility "traitalias" batch_type_alias_targets {
-// 754|    let (is_list, pkg, targets) = $4
-// 755|    TopBatchTraitAlias(
-// 756|      pkg~,
-// 757|      targets~,
-// 758|      vis = $2,
-// 759|      attrs = $1,
-// 760|      is_list~,
-// 761|      doc = DocString::empty(),
-// 762|      loc = mk_loc($sloc)
-// 763|    )
-// 764|  }
+// 762|    attributes visibility "traitalias" batch_type_alias_targets {
+// 763|    let (is_list, pkg, targets) = $4
+// 764|    TopBatchTraitAlias(
+// 765|      pkg~,
+// 766|      targets~,
+// 767|      vis = $2,
+// 768|      attrs = $1,
+// 769|      is_list~,
+// 770|      doc = DocString::empty(),
+// 771|      loc = mk_loc($sloc)
+// 772|    )
+// 773|  }
 
 ///|
 fn yy_action_148(
@@ -7552,19 +7746,19 @@ fn yy_action_148(
 }
 
 // file:///./parser.mbty
-// 765|    attributes is_async "test" option(loced_string) option(parameters) block_expr_with_local_types {
-// 766|    let (local_types, expr) = $6
-// 767|    TopTest(
-// 768|      expr~,
-// 769|      name = $4,
-// 770|      params = $5,
-// 771|      local_types~,
-// 772|      is_async = $2,
-// 773|      loc = mk_loc($sloc),
-// 774|      attrs = $1,
-// 775|      doc = DocString::empty()
-// 776|    )
-// 777|  }
+// 774|    attributes is_async "test" option(loced_string) option(parameters) block_expr_with_local_types {
+// 775|    let (local_types, expr) = $6
+// 776|    TopTest(
+// 777|      expr~,
+// 778|      name = $4,
+// 779|      params = $5,
+// 780|      local_types~,
+// 781|      is_async = $2,
+// 782|      loc = mk_loc($sloc),
+// 783|      attrs = $1,
+// 784|      doc = DocString::empty()
+// 785|    )
+// 786|  }
 
 ///|
 fn yy_action_149(
@@ -7603,24 +7797,24 @@ fn yy_action_149(
 }
 
 // file:///./parser.mbty
-// 778|    attributes visibility "impl" optional_type_parameters type_name "for" type_ "with" binder optional_bang parameters func_return_type impl_body {
-// 779|    let (ret_ty, err_ty) = $12
-// 780|    TopImpl(
-// 781|      self_ty = Some($7),
-// 782|      trait_ = $5,
-// 783|      method_name = $9,
-// 784|      has_error = $10,
-// 785|      quantifiers = $4,
-// 786|      params = $11,
-// 787|      ret_ty~,
-// 788|      err_ty~,
-// 789|      body = $13,
-// 790|      vis = $2,
-// 791|      loc = mk_loc($sloc),
-// 792|      attrs = $1,
-// 793|      doc = DocString::empty()
-// 794|    )
-// 795|  }
+// 787|    attributes visibility "impl" optional_type_parameters type_name "for" type_ "with" binder optional_bang parameters func_return_type impl_body {
+// 788|    let (ret_ty, err_ty) = $12
+// 789|    TopImpl(
+// 790|      self_ty = Some($7),
+// 791|      trait_ = $5,
+// 792|      method_name = $9,
+// 793|      has_error = $10,
+// 794|      quantifiers = $4,
+// 795|      params = $11,
+// 796|      ret_ty~,
+// 797|      err_ty~,
+// 798|      body = $13,
+// 799|      vis = $2,
+// 800|      loc = mk_loc($sloc),
+// 801|      attrs = $1,
+// 802|      doc = DocString::empty()
+// 803|    )
+// 804|  }
 
 ///|
 fn yy_action_150(
@@ -7670,18 +7864,18 @@ fn yy_action_150(
 }
 
 // file:///./parser.mbty
-// 814|    attributes is_declare visibility "impl" optional_type_parameters type_name "for" type_ {
-// 815|    TopImplRelation(
-// 816|      self_ty = $8,
-// 817|      trait_ = $6,
-// 818|      quantifiers = $5,
-// 819|      vis = $3,
-// 820|      attrs = $1,
-// 821|      loc = mk_loc($sloc),
-// 822|      doc = DocString::empty(),
-// 823|      is_declare = $2
-// 824|    )
-// 825|  }
+// 823|    attributes is_declare visibility "impl" optional_type_parameters type_name "for" type_ {
+// 824|    TopImplRelation(
+// 825|      self_ty = $8,
+// 826|      trait_ = $6,
+// 827|      quantifiers = $5,
+// 828|      vis = $3,
+// 829|      attrs = $1,
+// 830|      loc = mk_loc($sloc),
+// 831|      doc = DocString::empty(),
+// 832|      is_declare = $2
+// 833|    )
+// 834|  }
 
 ///|
 fn yy_action_151(
@@ -7721,24 +7915,24 @@ fn yy_action_151(
 }
 
 // file:///./parser.mbty
-// 796|    attributes visibility "impl" optional_type_parameters type_name "with" binder optional_bang parameters func_return_type impl_body {
-// 797|    let (ret_ty, err_ty) = $10
-// 798|    TopImpl(
-// 799|      self_ty = None,
-// 800|      trait_ = $5,
-// 801|      method_name = $7,
-// 802|      has_error = $8,
-// 803|      quantifiers = $4,
-// 804|      params = $9,
-// 805|      ret_ty~,
-// 806|      err_ty~,
-// 807|      body = $11,
-// 808|      vis = $2,
-// 809|      loc = mk_loc($sloc),
-// 810|      attrs = $1,
-// 811|      doc = DocString::empty()
-// 812|    )
-// 813|  }
+// 805|    attributes visibility "impl" optional_type_parameters type_name "with" binder optional_bang parameters func_return_type impl_body {
+// 806|    let (ret_ty, err_ty) = $10
+// 807|    TopImpl(
+// 808|      self_ty = None,
+// 809|      trait_ = $5,
+// 810|      method_name = $7,
+// 811|      has_error = $8,
+// 812|      quantifiers = $4,
+// 813|      params = $9,
+// 814|      ret_ty~,
+// 815|      err_ty~,
+// 816|      body = $11,
+// 817|      vis = $2,
+// 818|      loc = mk_loc($sloc),
+// 819|      attrs = $1,
+// 820|      doc = DocString::empty()
+// 821|    )
+// 822|  }
 
 ///|
 fn yy_action_152(
@@ -7787,23 +7981,23 @@ fn yy_action_152(
 }
 
 // file:///./parser.mbty
-// 826|    attributes visibility "enumview" optional_type_parameters UIDENT "{" list_semis(enum_constructor) "}" "for" type_ "with" binder parameters block_expr {
-// 827|    TopView(
-// 828|      quantifiers = $4,
-// 829|      source_ty = $10,
-// 830|      view_type_name = $5,
-// 831|      view_type_loc = mk_loc($loc($5)),
-// 832|      view_func_name = $12,
-// 833|      parameters = $13,
-// 834|      params_loc = mk_loc($loc($13)),
-// 835|      view_constrs = $7,
-// 836|      body = $14,
-// 837|      vis = $2,
-// 838|      loc = mk_loc($sloc),
-// 839|      attrs = $1,
-// 840|      doc = DocString::empty()
-// 841|    )
-// 842|  }
+// 835|    attributes visibility "enumview" optional_type_parameters UIDENT "{" list_semis(enum_constructor) "}" "for" type_ "with" binder parameters block_expr {
+// 836|    TopView(
+// 837|      quantifiers = $4,
+// 838|      source_ty = $10,
+// 839|      view_type_name = $5,
+// 840|      view_type_loc = mk_loc($loc($5)),
+// 841|      view_func_name = $12,
+// 842|      parameters = $13,
+// 843|      params_loc = mk_loc($loc($13)),
+// 844|      view_constrs = $7,
+// 845|      body = $14,
+// 846|      vis = $2,
+// 847|      loc = mk_loc($sloc),
+// 848|      attrs = $1,
+// 849|      doc = DocString::empty()
+// 850|    )
+// 851|  }
 
 ///|
 fn yy_action_153(
@@ -7855,19 +8049,19 @@ fn yy_action_153(
 }
 
 // file:///./parser.mbty
-// 843|    attributes visibility "using" PACKAGE_NAME "{" list_commas(using_binder) "}" {
-// 844|    TopUsing(
-// 845|      pkg = {
-// 846|        name : $4,
-// 847|        loc : mk_loc($loc($4))
-// 848|      },
-// 849|      names = $6,
-// 850|      vis = $2,
-// 851|      attrs = $1,
-// 852|      loc = mk_loc($loc),
-// 853|      doc = DocString::empty()
-// 854|    )
-// 855|  }
+// 852|    attributes visibility "using" PACKAGE_NAME "{" list_commas(using_binder) "}" {
+// 853|    TopUsing(
+// 854|      pkg = {
+// 855|        name : $4,
+// 856|        loc : mk_loc($loc($4))
+// 857|      },
+// 858|      names = $6,
+// 859|      vis = $2,
+// 860|      attrs = $1,
+// 861|      loc = mk_loc($loc),
+// 862|      doc = DocString::empty()
+// 863|    )
+// 864|  }
 
 ///|
 fn yy_action_154(
@@ -7907,9 +8101,9 @@ fn yy_action_154(
 }
 
 // file:///./parser.mbty
-// 884|    attributes is_declare visibility "type" UIDENT optional_type_parameters_no_constraints { 
-// 885|    ($1, $3, $2, $5, mk_loc($loc($5)), $6) 
-// 886|  }
+// 893|    attributes is_declare visibility "type" UIDENT optional_type_parameters_no_constraints { 
+// 894|    ($1, $3, $2, $5, mk_loc($loc($5)), $6) 
+// 895|  }
 
 ///|
 fn yy_action_155(
@@ -7942,7 +8136,7 @@ fn yy_action_155(
 }
 
 // file:///./parser.mbty
-// 890|    attributes is_declare visibility "suberror" UIDENT { ($1, $3, $2, $5, mk_loc($loc($5))) }
+// 899|    attributes is_declare visibility "suberror" UIDENT { ($1, $3, $2, $5, mk_loc($loc($5))) }
 
 ///|
 fn yy_action_156(
@@ -7973,9 +8167,9 @@ fn yy_action_156(
 }
 
 // file:///./parser.mbty
-// 894|    attributes visibility "struct" UIDENT optional_type_parameters_no_constraints { 
-// 895|    ($1, $2, $4, mk_loc($loc($4)), $5) 
-// 896|  }
+// 903|    attributes visibility "struct" UIDENT optional_type_parameters_no_constraints { 
+// 904|    ($1, $2, $4, mk_loc($loc($4)), $5) 
+// 905|  }
 
 ///|
 fn yy_action_157(
@@ -8005,9 +8199,9 @@ fn yy_action_157(
 }
 
 // file:///./parser.mbty
-// 900|    attributes visibility "enum" UIDENT optional_type_parameters_no_constraints { 
-// 901|    ($1, $2, $4, mk_loc($loc($4)), $5) 
-// 902|  }
+// 909|    attributes visibility "enum" UIDENT optional_type_parameters_no_constraints { 
+// 910|    ($1, $2, $4, mk_loc($loc($4)), $5) 
+// 911|  }
 
 ///|
 fn yy_action_158(
@@ -8037,24 +8231,25 @@ fn yy_action_158(
 }
 
 // file:///./parser.mbty
-// 341|    attributes "declare" visibility is_async fun_header_generic option(parameters) func_return_type {
-// 342|    let ((type_name, f), has_error, quants) = $5
-// 343|    let (return_type, error_type) = $7
-// 344|    FunDecl::{
-// 345|      type_name,
-// 346|      name: f,
-// 347|      has_error,
-// 348|      is_async : $4,
-// 349|      quantifiers: quants,
-// 350|      decl_params: $6,
-// 351|      params_loc: mk_loc($loc($6)),
-// 352|      return_type,
-// 353|      error_type,
-// 354|      vis: $3,
-// 355|      doc: DocString::empty(),
-// 356|      attrs: $1,
-// 357|    }
-// 358|  }
+// 347|    attributes "declare" visibility is_async fun_header_generic option(parameters) func_return_type {
+// 348|    let ((type_name, f), has_error, quants) = $5
+// 349|    let (return_type, error_type) = $7
+// 350|    FunDecl::{
+// 351|      type_name,
+// 352|      name: f,
+// 353|      has_error,
+// 354|      is_async : $4,
+// 355|      quantifiers: quants,
+// 356|      decl_params: $6,
+// 357|      params_loc: mk_loc($loc($6)),
+// 358|      return_type,
+// 359|      error_type,
+// 360|      vis: $3,
+// 361|      doc: DocString::empty(),
+// 362|      attrs: $1,
+// 363|      loc : mk_loc($loc)
+// 364|    }
+// 365|  }
 
 ///|
 fn yy_action_159(
@@ -8073,6 +8268,12 @@ fn yy_action_159(
   let _end_pos_of_item5 = _args[3].2
   guard _sub_action_1_result is YYObj_Visibility(_dollar3)
   guard _sub_action_0_result is YYObj_List_Attribute_(_dollar1)
+  let _start_pos = if _args.length() == 0 { _last_pos } else { _args[0].1 }
+  let _end_pos = if _args.length() == 0 {
+    _last_pos
+  } else {
+    _args[_args.length() - 1].2
+  }
   YYObj_FunDecl(
     {
       ()
@@ -8091,30 +8292,32 @@ fn yy_action_159(
         vis: _dollar3,
         doc: DocString::empty(),
         attrs: _dollar1,
+        loc: mk_loc((_start_pos, _end_pos)),
       }
     },
   )
 }
 
 // file:///./parser.mbty
-// 341|    attributes "declare" visibility is_async fun_header_generic option(parameters) func_return_type {
-// 342|    let ((type_name, f), has_error, quants) = $5
-// 343|    let (return_type, error_type) = $7
-// 344|    FunDecl::{
-// 345|      type_name,
-// 346|      name: f,
-// 347|      has_error,
-// 348|      is_async : $4,
-// 349|      quantifiers: quants,
-// 350|      decl_params: $6,
-// 351|      params_loc: mk_loc($loc($6)),
-// 352|      return_type,
-// 353|      error_type,
-// 354|      vis: $3,
-// 355|      doc: DocString::empty(),
-// 356|      attrs: $1,
-// 357|    }
-// 358|  }
+// 347|    attributes "declare" visibility is_async fun_header_generic option(parameters) func_return_type {
+// 348|    let ((type_name, f), has_error, quants) = $5
+// 349|    let (return_type, error_type) = $7
+// 350|    FunDecl::{
+// 351|      type_name,
+// 352|      name: f,
+// 353|      has_error,
+// 354|      is_async : $4,
+// 355|      quantifiers: quants,
+// 356|      decl_params: $6,
+// 357|      params_loc: mk_loc($loc($6)),
+// 358|      return_type,
+// 359|      error_type,
+// 360|      vis: $3,
+// 361|      doc: DocString::empty(),
+// 362|      attrs: $1,
+// 363|      loc : mk_loc($loc)
+// 364|    }
+// 365|  }
 
 ///|
 fn yy_action_160(
@@ -8133,6 +8336,12 @@ fn yy_action_160(
   let _end_pos_of_item5 = _args[2].2
   guard _sub_action_1_result is YYObj_Visibility(_dollar3)
   guard _sub_action_0_result is YYObj_List_Attribute_(_dollar1)
+  let _start_pos = if _args.length() == 0 { _last_pos } else { _args[0].1 }
+  let _end_pos = if _args.length() == 0 {
+    _last_pos
+  } else {
+    _args[_args.length() - 1].2
+  }
   YYObj_FunDecl(
     {
       ()
@@ -8151,30 +8360,32 @@ fn yy_action_160(
         vis: _dollar3,
         doc: DocString::empty(),
         attrs: _dollar1,
+        loc: mk_loc((_start_pos, _end_pos)),
       }
     },
   )
 }
 
 // file:///./parser.mbty
-// 341|    attributes "declare" visibility is_async fun_header_generic option(parameters) func_return_type {
-// 342|    let ((type_name, f), has_error, quants) = $5
-// 343|    let (return_type, error_type) = $7
-// 344|    FunDecl::{
-// 345|      type_name,
-// 346|      name: f,
-// 347|      has_error,
-// 348|      is_async : $4,
-// 349|      quantifiers: quants,
-// 350|      decl_params: $6,
-// 351|      params_loc: mk_loc($loc($6)),
-// 352|      return_type,
-// 353|      error_type,
-// 354|      vis: $3,
-// 355|      doc: DocString::empty(),
-// 356|      attrs: $1,
-// 357|    }
-// 358|  }
+// 347|    attributes "declare" visibility is_async fun_header_generic option(parameters) func_return_type {
+// 348|    let ((type_name, f), has_error, quants) = $5
+// 349|    let (return_type, error_type) = $7
+// 350|    FunDecl::{
+// 351|      type_name,
+// 352|      name: f,
+// 353|      has_error,
+// 354|      is_async : $4,
+// 355|      quantifiers: quants,
+// 356|      decl_params: $6,
+// 357|      params_loc: mk_loc($loc($6)),
+// 358|      return_type,
+// 359|      error_type,
+// 360|      vis: $3,
+// 361|      doc: DocString::empty(),
+// 362|      attrs: $1,
+// 363|      loc : mk_loc($loc)
+// 364|    }
+// 365|  }
 
 ///|
 fn yy_action_161(
@@ -8193,6 +8404,12 @@ fn yy_action_161(
   let _end_pos_of_item5 = _args[4].2
   guard _sub_action_1_result is YYObj_Visibility(_dollar3)
   guard _sub_action_0_result is YYObj_List_Attribute_(_dollar1)
+  let _start_pos = if _args.length() == 0 { _last_pos } else { _args[0].1 }
+  let _end_pos = if _args.length() == 0 {
+    _last_pos
+  } else {
+    _args[_args.length() - 1].2
+  }
   YYObj_FunDecl(
     {
       ()
@@ -8211,30 +8428,32 @@ fn yy_action_161(
         vis: _dollar3,
         doc: DocString::empty(),
         attrs: _dollar1,
+        loc: mk_loc((_start_pos, _end_pos)),
       }
     },
   )
 }
 
 // file:///./parser.mbty
-// 341|    attributes "declare" visibility is_async fun_header_generic option(parameters) func_return_type {
-// 342|    let ((type_name, f), has_error, quants) = $5
-// 343|    let (return_type, error_type) = $7
-// 344|    FunDecl::{
-// 345|      type_name,
-// 346|      name: f,
-// 347|      has_error,
-// 348|      is_async : $4,
-// 349|      quantifiers: quants,
-// 350|      decl_params: $6,
-// 351|      params_loc: mk_loc($loc($6)),
-// 352|      return_type,
-// 353|      error_type,
-// 354|      vis: $3,
-// 355|      doc: DocString::empty(),
-// 356|      attrs: $1,
-// 357|    }
-// 358|  }
+// 347|    attributes "declare" visibility is_async fun_header_generic option(parameters) func_return_type {
+// 348|    let ((type_name, f), has_error, quants) = $5
+// 349|    let (return_type, error_type) = $7
+// 350|    FunDecl::{
+// 351|      type_name,
+// 352|      name: f,
+// 353|      has_error,
+// 354|      is_async : $4,
+// 355|      quantifiers: quants,
+// 356|      decl_params: $6,
+// 357|      params_loc: mk_loc($loc($6)),
+// 358|      return_type,
+// 359|      error_type,
+// 360|      vis: $3,
+// 361|      doc: DocString::empty(),
+// 362|      attrs: $1,
+// 363|      loc : mk_loc($loc)
+// 364|    }
+// 365|  }
 
 ///|
 fn yy_action_162(
@@ -8253,6 +8472,12 @@ fn yy_action_162(
   let _end_pos_of_item5 = _args[3].2
   guard _sub_action_1_result is YYObj_Visibility(_dollar3)
   guard _sub_action_0_result is YYObj_List_Attribute_(_dollar1)
+  let _start_pos = if _args.length() == 0 { _last_pos } else { _args[0].1 }
+  let _end_pos = if _args.length() == 0 {
+    _last_pos
+  } else {
+    _args[_args.length() - 1].2
+  }
   YYObj_FunDecl(
     {
       ()
@@ -8271,13 +8496,14 @@ fn yy_action_162(
         vis: _dollar3,
         doc: DocString::empty(),
         attrs: _dollar1,
+        loc: mk_loc((_start_pos, _end_pos)),
       }
     },
   )
 }
 
 // file:///./parser.mbty
-// 451|    attributes is_declare visibility "let" binder opt_annot { ($1, false, $2, $3, $5, $6) }
+// 459|    attributes is_declare visibility "let" binder opt_annot { ($1, false, $2, $3, $5, $6) }
 
 ///|
 fn yy_action_163(
@@ -8303,7 +8529,7 @@ fn yy_action_163(
 }
 
 // file:///./parser.mbty
-// 451|    attributes is_declare visibility "let" binder opt_annot { ($1, false, $2, $3, $5, $6) }
+// 459|    attributes is_declare visibility "let" binder opt_annot { ($1, false, $2, $3, $5, $6) }
 
 ///|
 fn yy_action_164(
@@ -8329,7 +8555,7 @@ fn yy_action_164(
 }
 
 // file:///./parser.mbty
-// 452|    attributes is_declare visibility "const" UIDENT opt_annot { ($1, true, $2, $3, Binder::{ name : $5, loc : mk_loc($loc($5)) }, $6) }
+// 460|    attributes is_declare visibility "const" UIDENT opt_annot { ($1, true, $2, $3, Binder::{ name : $5, loc : mk_loc($loc($5)) }, $6) }
 
 ///|
 fn yy_action_165(
@@ -8366,7 +8592,7 @@ fn yy_action_165(
 }
 
 // file:///./parser.mbty
-// 452|    attributes is_declare visibility "const" UIDENT opt_annot { ($1, true, $2, $3, Binder::{ name : $5, loc : mk_loc($loc($5)) }, $6) }
+// 460|    attributes is_declare visibility "const" UIDENT opt_annot { ($1, true, $2, $3, Binder::{ name : $5, loc : mk_loc($loc($5)) }, $6) }
 
 ///|
 fn yy_action_166(
@@ -8403,25 +8629,25 @@ fn yy_action_166(
 }
 
 // file:///./parser.mbty
-// 689|    attributes is_declare visibility "trait" UIDENT option(preceded(COLON, separated_nonempty_list(PLUS, tvar_constraint))) "{" list_semis(trait_method_decl) "}" {
-// 690|    let name = Binder::{ name: $5, loc: mk_loc($loc($4)) }
-// 691|    let supers = match $6 {
-// 692|      None => @list.empty()
-// 693|      Some(supers) => supers
-// 694|    }
-// 695|    TopTrait(
-// 696|      TraitDecl::{
-// 697|        name,
-// 698|        supers,
-// 699|        methods: $8,
-// 700|        vis: $3,
-// 701|        loc: mk_loc($sloc),
-// 702|        attrs: $1,
-// 703|        doc : DocString::empty(),
-// 704|        is_declare : $2
-// 705|      }
-// 706|    )
-// 707|  }
+// 698|    attributes is_declare visibility "trait" UIDENT option(preceded(COLON, separated_nonempty_list(PLUS, tvar_constraint))) "{" list_semis(trait_method_decl) "}" {
+// 699|    let name = Binder::{ name: $5, loc: mk_loc($loc($4)) }
+// 700|    let supers = match $6 {
+// 701|      None => @list.empty()
+// 702|      Some(supers) => supers
+// 703|    }
+// 704|    TopTrait(
+// 705|      TraitDecl::{
+// 706|        name,
+// 707|        supers,
+// 708|        methods: $8,
+// 709|        vis: $3,
+// 710|        loc: mk_loc($sloc),
+// 711|        attrs: $1,
+// 712|        doc : DocString::empty(),
+// 713|        is_declare : $2
+// 714|      }
+// 715|    )
+// 716|  }
 
 ///|
 fn yy_action_167(
@@ -8471,18 +8697,18 @@ fn yy_action_167(
 }
 
 // file:///./parser.mbty
-// 814|    attributes is_declare visibility "impl" optional_type_parameters type_name "for" type_ {
-// 815|    TopImplRelation(
-// 816|      self_ty = $8,
-// 817|      trait_ = $6,
-// 818|      quantifiers = $5,
-// 819|      vis = $3,
-// 820|      attrs = $1,
-// 821|      loc = mk_loc($sloc),
-// 822|      doc = DocString::empty(),
-// 823|      is_declare = $2
-// 824|    )
-// 825|  }
+// 823|    attributes is_declare visibility "impl" optional_type_parameters type_name "for" type_ {
+// 824|    TopImplRelation(
+// 825|      self_ty = $8,
+// 826|      trait_ = $6,
+// 827|      quantifiers = $5,
+// 828|      vis = $3,
+// 829|      attrs = $1,
+// 830|      loc = mk_loc($sloc),
+// 831|      doc = DocString::empty(),
+// 832|      is_declare = $2
+// 833|    )
+// 834|  }
 
 ///|
 fn yy_action_168(
@@ -8522,9 +8748,9 @@ fn yy_action_168(
 }
 
 // file:///./parser.mbty
-// 884|    attributes is_declare visibility "type" UIDENT optional_type_parameters_no_constraints { 
-// 885|    ($1, $3, $2, $5, mk_loc($loc($5)), $6) 
-// 886|  }
+// 893|    attributes is_declare visibility "type" UIDENT optional_type_parameters_no_constraints { 
+// 894|    ($1, $3, $2, $5, mk_loc($loc($5)), $6) 
+// 895|  }
 
 ///|
 fn yy_action_169(
@@ -8557,7 +8783,7 @@ fn yy_action_169(
 }
 
 // file:///./parser.mbty
-// 890|    attributes is_declare visibility "suberror" UIDENT { ($1, $3, $2, $5, mk_loc($loc($5))) }
+// 899|    attributes is_declare visibility "suberror" UIDENT { ($1, $3, $2, $5, mk_loc($loc($5))) }
 
 ///|
 fn yy_action_170(
@@ -8588,24 +8814,25 @@ fn yy_action_170(
 }
 
 // file:///./parser.mbty
-// 341|    attributes "declare" visibility is_async fun_header_generic option(parameters) func_return_type {
-// 342|    let ((type_name, f), has_error, quants) = $5
-// 343|    let (return_type, error_type) = $7
-// 344|    FunDecl::{
-// 345|      type_name,
-// 346|      name: f,
-// 347|      has_error,
-// 348|      is_async : $4,
-// 349|      quantifiers: quants,
-// 350|      decl_params: $6,
-// 351|      params_loc: mk_loc($loc($6)),
-// 352|      return_type,
-// 353|      error_type,
-// 354|      vis: $3,
-// 355|      doc: DocString::empty(),
-// 356|      attrs: $1,
-// 357|    }
-// 358|  }
+// 347|    attributes "declare" visibility is_async fun_header_generic option(parameters) func_return_type {
+// 348|    let ((type_name, f), has_error, quants) = $5
+// 349|    let (return_type, error_type) = $7
+// 350|    FunDecl::{
+// 351|      type_name,
+// 352|      name: f,
+// 353|      has_error,
+// 354|      is_async : $4,
+// 355|      quantifiers: quants,
+// 356|      decl_params: $6,
+// 357|      params_loc: mk_loc($loc($6)),
+// 358|      return_type,
+// 359|      error_type,
+// 360|      vis: $3,
+// 361|      doc: DocString::empty(),
+// 362|      attrs: $1,
+// 363|      loc : mk_loc($loc)
+// 364|    }
+// 365|  }
 
 ///|
 fn yy_action_171(
@@ -8624,6 +8851,12 @@ fn yy_action_171(
   let _end_pos_of_item5 = _args[5].2
   guard _sub_action_1_result is YYObj_Visibility(_dollar3)
   guard _sub_action_0_result is YYObj_List_Attribute_(_dollar1)
+  let _start_pos = if _args.length() == 0 { _last_pos } else { _args[0].1 }
+  let _end_pos = if _args.length() == 0 {
+    _last_pos
+  } else {
+    _args[_args.length() - 1].2
+  }
   YYObj_FunDecl(
     {
       ()
@@ -8642,30 +8875,32 @@ fn yy_action_171(
         vis: _dollar3,
         doc: DocString::empty(),
         attrs: _dollar1,
+        loc: mk_loc((_start_pos, _end_pos)),
       }
     },
   )
 }
 
 // file:///./parser.mbty
-// 341|    attributes "declare" visibility is_async fun_header_generic option(parameters) func_return_type {
-// 342|    let ((type_name, f), has_error, quants) = $5
-// 343|    let (return_type, error_type) = $7
-// 344|    FunDecl::{
-// 345|      type_name,
-// 346|      name: f,
-// 347|      has_error,
-// 348|      is_async : $4,
-// 349|      quantifiers: quants,
-// 350|      decl_params: $6,
-// 351|      params_loc: mk_loc($loc($6)),
-// 352|      return_type,
-// 353|      error_type,
-// 354|      vis: $3,
-// 355|      doc: DocString::empty(),
-// 356|      attrs: $1,
-// 357|    }
-// 358|  }
+// 347|    attributes "declare" visibility is_async fun_header_generic option(parameters) func_return_type {
+// 348|    let ((type_name, f), has_error, quants) = $5
+// 349|    let (return_type, error_type) = $7
+// 350|    FunDecl::{
+// 351|      type_name,
+// 352|      name: f,
+// 353|      has_error,
+// 354|      is_async : $4,
+// 355|      quantifiers: quants,
+// 356|      decl_params: $6,
+// 357|      params_loc: mk_loc($loc($6)),
+// 358|      return_type,
+// 359|      error_type,
+// 360|      vis: $3,
+// 361|      doc: DocString::empty(),
+// 362|      attrs: $1,
+// 363|      loc : mk_loc($loc)
+// 364|    }
+// 365|  }
 
 ///|
 fn yy_action_172(
@@ -8684,6 +8919,12 @@ fn yy_action_172(
   let _end_pos_of_item5 = _args[4].2
   guard _sub_action_1_result is YYObj_Visibility(_dollar3)
   guard _sub_action_0_result is YYObj_List_Attribute_(_dollar1)
+  let _start_pos = if _args.length() == 0 { _last_pos } else { _args[0].1 }
+  let _end_pos = if _args.length() == 0 {
+    _last_pos
+  } else {
+    _args[_args.length() - 1].2
+  }
   YYObj_FunDecl(
     {
       ()
@@ -8702,13 +8943,14 @@ fn yy_action_172(
         vis: _dollar3,
         doc: DocString::empty(),
         attrs: _dollar1,
+        loc: mk_loc((_start_pos, _end_pos)),
       }
     },
   )
 }
 
 // file:///./parser.mbty
-// 451|    attributes is_declare visibility "let" binder opt_annot { ($1, false, $2, $3, $5, $6) }
+// 459|    attributes is_declare visibility "let" binder opt_annot { ($1, false, $2, $3, $5, $6) }
 
 ///|
 fn yy_action_173(
@@ -8734,7 +8976,7 @@ fn yy_action_173(
 }
 
 // file:///./parser.mbty
-// 451|    attributes is_declare visibility "let" binder opt_annot { ($1, false, $2, $3, $5, $6) }
+// 459|    attributes is_declare visibility "let" binder opt_annot { ($1, false, $2, $3, $5, $6) }
 
 ///|
 fn yy_action_174(
@@ -8760,7 +9002,7 @@ fn yy_action_174(
 }
 
 // file:///./parser.mbty
-// 452|    attributes is_declare visibility "const" UIDENT opt_annot { ($1, true, $2, $3, Binder::{ name : $5, loc : mk_loc($loc($5)) }, $6) }
+// 460|    attributes is_declare visibility "const" UIDENT opt_annot { ($1, true, $2, $3, Binder::{ name : $5, loc : mk_loc($loc($5)) }, $6) }
 
 ///|
 fn yy_action_175(
@@ -8797,7 +9039,7 @@ fn yy_action_175(
 }
 
 // file:///./parser.mbty
-// 452|    attributes is_declare visibility "const" UIDENT opt_annot { ($1, true, $2, $3, Binder::{ name : $5, loc : mk_loc($loc($5)) }, $6) }
+// 460|    attributes is_declare visibility "const" UIDENT opt_annot { ($1, true, $2, $3, Binder::{ name : $5, loc : mk_loc($loc($5)) }, $6) }
 
 ///|
 fn yy_action_176(
@@ -8834,25 +9076,25 @@ fn yy_action_176(
 }
 
 // file:///./parser.mbty
-// 689|    attributes is_declare visibility "trait" UIDENT option(preceded(COLON, separated_nonempty_list(PLUS, tvar_constraint))) "{" list_semis(trait_method_decl) "}" {
-// 690|    let name = Binder::{ name: $5, loc: mk_loc($loc($4)) }
-// 691|    let supers = match $6 {
-// 692|      None => @list.empty()
-// 693|      Some(supers) => supers
-// 694|    }
-// 695|    TopTrait(
-// 696|      TraitDecl::{
-// 697|        name,
-// 698|        supers,
-// 699|        methods: $8,
-// 700|        vis: $3,
-// 701|        loc: mk_loc($sloc),
-// 702|        attrs: $1,
-// 703|        doc : DocString::empty(),
-// 704|        is_declare : $2
-// 705|      }
-// 706|    )
-// 707|  }
+// 698|    attributes is_declare visibility "trait" UIDENT option(preceded(COLON, separated_nonempty_list(PLUS, tvar_constraint))) "{" list_semis(trait_method_decl) "}" {
+// 699|    let name = Binder::{ name: $5, loc: mk_loc($loc($4)) }
+// 700|    let supers = match $6 {
+// 701|      None => @list.empty()
+// 702|      Some(supers) => supers
+// 703|    }
+// 704|    TopTrait(
+// 705|      TraitDecl::{
+// 706|        name,
+// 707|        supers,
+// 708|        methods: $8,
+// 709|        vis: $3,
+// 710|        loc: mk_loc($sloc),
+// 711|        attrs: $1,
+// 712|        doc : DocString::empty(),
+// 713|        is_declare : $2
+// 714|      }
+// 715|    )
+// 716|  }
 
 ///|
 fn yy_action_177(
@@ -8902,18 +9144,18 @@ fn yy_action_177(
 }
 
 // file:///./parser.mbty
-// 814|    attributes is_declare visibility "impl" optional_type_parameters type_name "for" type_ {
-// 815|    TopImplRelation(
-// 816|      self_ty = $8,
-// 817|      trait_ = $6,
-// 818|      quantifiers = $5,
-// 819|      vis = $3,
-// 820|      attrs = $1,
-// 821|      loc = mk_loc($sloc),
-// 822|      doc = DocString::empty(),
-// 823|      is_declare = $2
-// 824|    )
-// 825|  }
+// 823|    attributes is_declare visibility "impl" optional_type_parameters type_name "for" type_ {
+// 824|    TopImplRelation(
+// 825|      self_ty = $8,
+// 826|      trait_ = $6,
+// 827|      quantifiers = $5,
+// 828|      vis = $3,
+// 829|      attrs = $1,
+// 830|      loc = mk_loc($sloc),
+// 831|      doc = DocString::empty(),
+// 832|      is_declare = $2
+// 833|    )
+// 834|  }
 
 ///|
 fn yy_action_178(
@@ -8953,9 +9195,9 @@ fn yy_action_178(
 }
 
 // file:///./parser.mbty
-// 884|    attributes is_declare visibility "type" UIDENT optional_type_parameters_no_constraints { 
-// 885|    ($1, $3, $2, $5, mk_loc($loc($5)), $6) 
-// 886|  }
+// 893|    attributes is_declare visibility "type" UIDENT optional_type_parameters_no_constraints { 
+// 894|    ($1, $3, $2, $5, mk_loc($loc($5)), $6) 
+// 895|  }
 
 ///|
 fn yy_action_179(
@@ -8988,7 +9230,7 @@ fn yy_action_179(
 }
 
 // file:///./parser.mbty
-// 890|    attributes is_declare visibility "suberror" UIDENT { ($1, $3, $2, $5, mk_loc($loc($5))) }
+// 899|    attributes is_declare visibility "suberror" UIDENT { ($1, $3, $2, $5, mk_loc($loc($5))) }
 
 ///|
 fn yy_action_180(
@@ -9019,7 +9261,7 @@ fn yy_action_180(
 }
 
 // file:///./parser.mbty
-// 451|    attributes is_declare visibility "let" binder opt_annot { ($1, false, $2, $3, $5, $6) }
+// 459|    attributes is_declare visibility "let" binder opt_annot { ($1, false, $2, $3, $5, $6) }
 
 ///|
 fn yy_action_181(
@@ -9045,7 +9287,7 @@ fn yy_action_181(
 }
 
 // file:///./parser.mbty
-// 451|    attributes is_declare visibility "let" binder opt_annot { ($1, false, $2, $3, $5, $6) }
+// 459|    attributes is_declare visibility "let" binder opt_annot { ($1, false, $2, $3, $5, $6) }
 
 ///|
 fn yy_action_182(
@@ -9071,7 +9313,7 @@ fn yy_action_182(
 }
 
 // file:///./parser.mbty
-// 452|    attributes is_declare visibility "const" UIDENT opt_annot { ($1, true, $2, $3, Binder::{ name : $5, loc : mk_loc($loc($5)) }, $6) }
+// 460|    attributes is_declare visibility "const" UIDENT opt_annot { ($1, true, $2, $3, Binder::{ name : $5, loc : mk_loc($loc($5)) }, $6) }
 
 ///|
 fn yy_action_183(
@@ -9108,7 +9350,7 @@ fn yy_action_183(
 }
 
 // file:///./parser.mbty
-// 452|    attributes is_declare visibility "const" UIDENT opt_annot { ($1, true, $2, $3, Binder::{ name : $5, loc : mk_loc($loc($5)) }, $6) }
+// 460|    attributes is_declare visibility "const" UIDENT opt_annot { ($1, true, $2, $3, Binder::{ name : $5, loc : mk_loc($loc($5)) }, $6) }
 
 ///|
 fn yy_action_184(
@@ -9145,25 +9387,25 @@ fn yy_action_184(
 }
 
 // file:///./parser.mbty
-// 689|    attributes is_declare visibility "trait" UIDENT option(preceded(COLON, separated_nonempty_list(PLUS, tvar_constraint))) "{" list_semis(trait_method_decl) "}" {
-// 690|    let name = Binder::{ name: $5, loc: mk_loc($loc($4)) }
-// 691|    let supers = match $6 {
-// 692|      None => @list.empty()
-// 693|      Some(supers) => supers
-// 694|    }
-// 695|    TopTrait(
-// 696|      TraitDecl::{
-// 697|        name,
-// 698|        supers,
-// 699|        methods: $8,
-// 700|        vis: $3,
-// 701|        loc: mk_loc($sloc),
-// 702|        attrs: $1,
-// 703|        doc : DocString::empty(),
-// 704|        is_declare : $2
-// 705|      }
-// 706|    )
-// 707|  }
+// 698|    attributes is_declare visibility "trait" UIDENT option(preceded(COLON, separated_nonempty_list(PLUS, tvar_constraint))) "{" list_semis(trait_method_decl) "}" {
+// 699|    let name = Binder::{ name: $5, loc: mk_loc($loc($4)) }
+// 700|    let supers = match $6 {
+// 701|      None => @list.empty()
+// 702|      Some(supers) => supers
+// 703|    }
+// 704|    TopTrait(
+// 705|      TraitDecl::{
+// 706|        name,
+// 707|        supers,
+// 708|        methods: $8,
+// 709|        vis: $3,
+// 710|        loc: mk_loc($sloc),
+// 711|        attrs: $1,
+// 712|        doc : DocString::empty(),
+// 713|        is_declare : $2
+// 714|      }
+// 715|    )
+// 716|  }
 
 ///|
 fn yy_action_185(
@@ -9213,18 +9455,18 @@ fn yy_action_185(
 }
 
 // file:///./parser.mbty
-// 814|    attributes is_declare visibility "impl" optional_type_parameters type_name "for" type_ {
-// 815|    TopImplRelation(
-// 816|      self_ty = $8,
-// 817|      trait_ = $6,
-// 818|      quantifiers = $5,
-// 819|      vis = $3,
-// 820|      attrs = $1,
-// 821|      loc = mk_loc($sloc),
-// 822|      doc = DocString::empty(),
-// 823|      is_declare = $2
-// 824|    )
-// 825|  }
+// 823|    attributes is_declare visibility "impl" optional_type_parameters type_name "for" type_ {
+// 824|    TopImplRelation(
+// 825|      self_ty = $8,
+// 826|      trait_ = $6,
+// 827|      quantifiers = $5,
+// 828|      vis = $3,
+// 829|      attrs = $1,
+// 830|      loc = mk_loc($sloc),
+// 831|      doc = DocString::empty(),
+// 832|      is_declare = $2
+// 833|    )
+// 834|  }
 
 ///|
 fn yy_action_186(
@@ -9264,9 +9506,9 @@ fn yy_action_186(
 }
 
 // file:///./parser.mbty
-// 884|    attributes is_declare visibility "type" UIDENT optional_type_parameters_no_constraints { 
-// 885|    ($1, $3, $2, $5, mk_loc($loc($5)), $6) 
-// 886|  }
+// 893|    attributes is_declare visibility "type" UIDENT optional_type_parameters_no_constraints { 
+// 894|    ($1, $3, $2, $5, mk_loc($loc($5)), $6) 
+// 895|  }
 
 ///|
 fn yy_action_187(
@@ -9299,7 +9541,7 @@ fn yy_action_187(
 }
 
 // file:///./parser.mbty
-// 890|    attributes is_declare visibility "suberror" UIDENT { ($1, $3, $2, $5, mk_loc($loc($5))) }
+// 899|    attributes is_declare visibility "suberror" UIDENT { ($1, $3, $2, $5, mk_loc($loc($5))) }
 
 ///|
 fn yy_action_188(
@@ -9330,7 +9572,7 @@ fn yy_action_188(
 }
 
 // file:///./parser.mbty
-// 880|    "declare" { true }
+// 889|    "declare" { true }
 
 ///|
 fn yy_action_112(
@@ -9346,7 +9588,7 @@ fn yy_action_112(
 }
 
 // file:///./parser.mbty
-// 361|    "fn" type_parameters fun_binder optional_bang { ($3, $4, $2) }
+// 368|    "fn" type_parameters fun_binder optional_bang { ($3, $4, $2) }
 
 ///|
 fn yy_action_189(
@@ -9365,7 +9607,7 @@ fn yy_action_189(
 }
 
 // file:///./parser.mbty
-// 362|    "fn" fun_binder optional_bang optional_type_parameters { ($2, $3, $4) }
+// 369|    "fn" fun_binder optional_bang optional_type_parameters { ($2, $3, $4) }
 
 ///|
 fn yy_action_190(
@@ -9384,10 +9626,10 @@ fn yy_action_190(
 }
 
 // file:///./parser.mbty
-// 312|    type_name "::" LIDENT {
-// 313|    let binder = Binder::{ name: $3, loc: mk_loc($loc($3)) }
-// 314|    (Some($1), binder)
-// 315|  }
+// 317|    type_name "::" LIDENT {
+// 318|    let binder = Binder::{ name: $3, loc: mk_loc($loc($3)) }
+// 319|    (Some($1), binder)
+// 320|  }
 
 ///|
 fn yy_action_191(
@@ -9411,7 +9653,7 @@ fn yy_action_191(
 }
 
 // file:///./parser.mbty
-// 316|    binder { (None, $1) }
+// 321|    binder { (None, $1) }
 
 ///|
 fn yy_action_192(
@@ -9429,25 +9671,26 @@ fn yy_action_192(
 }
 
 // file:///./parser.mbty
-// 401|    attributes visibility "extern" STRING "fn" fun_binder optional_bang optional_type_parameters option(parameters) func_return_type {
-// 402|    let (type_name, f) = $6
-// 403|    let (return_type, error_type) = $10
-// 404|    let fn_decl = FunDecl::{
-// 405|      type_name,
-// 406|      name: f,
-// 407|      has_error : $7,
-// 408|      is_async : None,
-// 409|      quantifiers: $8,
-// 410|      decl_params: $9,
-// 411|      params_loc: mk_loc($loc($9)),
-// 412|      return_type,
-// 413|      error_type,
-// 414|      vis: $2,
-// 415|      doc: DocString::empty(),
-// 416|      attrs: $1,
-// 417|    }
-// 418|    ($4, fn_decl)
-// 419|  }
+// 408|    attributes visibility "extern" STRING "fn" fun_binder optional_bang optional_type_parameters option(parameters) func_return_type {
+// 409|    let (type_name, f) = $6
+// 410|    let (return_type, error_type) = $10
+// 411|    let fn_decl = FunDecl::{
+// 412|      type_name,
+// 413|      name: f,
+// 414|      has_error : $7,
+// 415|      is_async : None,
+// 416|      quantifiers: $8,
+// 417|      decl_params: $9,
+// 418|      params_loc: mk_loc($loc($9)),
+// 419|      return_type,
+// 420|      error_type,
+// 421|      vis: $2,
+// 422|      doc: DocString::empty(),
+// 423|      attrs: $1,
+// 424|      loc : mk_loc($loc)
+// 425|    }
+// 426|    ($4, fn_decl)
+// 427|  }
 
 ///|
 fn yy_action_193(
@@ -9465,6 +9708,12 @@ fn yy_action_193(
   let _end_pos_of_item8 = _args[6].2
   guard _sub_action_1_result is YYObj_Visibility(_dollar2)
   guard _sub_action_0_result is YYObj_List_Attribute_(_dollar1)
+  let _start_pos = if _args.length() == 0 { _last_pos } else { _args[0].1 }
+  let _end_pos = if _args.length() == 0 {
+    _last_pos
+  } else {
+    _args[_args.length() - 1].2
+  }
   guard _args[1].0 is YYObj_StringLiteral(_dollar4)
   YYObj__StringLiteral__FunDecl_(
     {
@@ -9484,6 +9733,7 @@ fn yy_action_193(
         vis: _dollar2,
         doc: DocString::empty(),
         attrs: _dollar1,
+        loc: mk_loc((_start_pos, _end_pos)),
       }
       (_dollar4, fn_decl)
     },
@@ -9491,22 +9741,22 @@ fn yy_action_193(
 }
 
 // file:///./parser.mbty
-// 477|    attributes visibility "extern" "type" UIDENT optional_type_parameters_no_constraints deriving_directive_list {
-// 478|    TopTypeDef(
-// 479|      TypeDecl::{
-// 480|        tycon : $5,
-// 481|        tycon_loc : mk_loc($loc($5)),
-// 482|        params : $6,
-// 483|        components: Extern,
-// 484|        type_vis : $2,
-// 485|        doc : DocString::empty(),
-// 486|        deriving: $7,
-// 487|        loc : mk_loc($sloc),
-// 488|        attrs : $1,
-// 489|        is_declare : false
-// 490|      }
-// 491|    )
-// 492|  }
+// 485|    attributes visibility "extern" "type" UIDENT optional_type_parameters_no_constraints deriving_directive_list {
+// 486|    TopTypeDef(
+// 487|      TypeDecl::{
+// 488|        tycon : $5,
+// 489|        tycon_loc : mk_loc($loc($5)),
+// 490|        params : $6,
+// 491|        components: Extern,
+// 492|        type_vis : $2,
+// 493|        doc : DocString::empty(),
+// 494|        deriving: $7,
+// 495|        loc : mk_loc($sloc),
+// 496|        attrs : $1,
+// 497|        is_declare : false
+// 498|      }
+// 499|    )
+// 500|  }
 
 ///|
 fn yy_action_194(
@@ -9548,7 +9798,7 @@ fn yy_action_194(
 }
 
 // file:///./parser.mbty
-// 451|    attributes is_declare visibility "let" binder opt_annot { ($1, false, $2, $3, $5, $6) }
+// 459|    attributes is_declare visibility "let" binder opt_annot { ($1, false, $2, $3, $5, $6) }
 
 ///|
 fn yy_action_195(
@@ -9574,7 +9824,7 @@ fn yy_action_195(
 }
 
 // file:///./parser.mbty
-// 451|    attributes is_declare visibility "let" binder opt_annot { ($1, false, $2, $3, $5, $6) }
+// 459|    attributes is_declare visibility "let" binder opt_annot { ($1, false, $2, $3, $5, $6) }
 
 ///|
 fn yy_action_196(
@@ -9600,7 +9850,7 @@ fn yy_action_196(
 }
 
 // file:///./parser.mbty
-// 452|    attributes is_declare visibility "const" UIDENT opt_annot { ($1, true, $2, $3, Binder::{ name : $5, loc : mk_loc($loc($5)) }, $6) }
+// 460|    attributes is_declare visibility "const" UIDENT opt_annot { ($1, true, $2, $3, Binder::{ name : $5, loc : mk_loc($loc($5)) }, $6) }
 
 ///|
 fn yy_action_197(
@@ -9637,7 +9887,7 @@ fn yy_action_197(
 }
 
 // file:///./parser.mbty
-// 452|    attributes is_declare visibility "const" UIDENT opt_annot { ($1, true, $2, $3, Binder::{ name : $5, loc : mk_loc($loc($5)) }, $6) }
+// 460|    attributes is_declare visibility "const" UIDENT opt_annot { ($1, true, $2, $3, Binder::{ name : $5, loc : mk_loc($loc($5)) }, $6) }
 
 ///|
 fn yy_action_198(
@@ -9674,23 +9924,23 @@ fn yy_action_198(
 }
 
 // file:///./parser.mbty
-// 460|    type_header deriving_directive_list {
-// 461|    let (attrs, type_vis, is_declare, tycon, tycon_loc, params) = $1
-// 462|    TopTypeDef(
-// 463|      TypeDecl::{
-// 464|        tycon,
-// 465|        tycon_loc,
-// 466|        params,
-// 467|        components: Abstract,
-// 468|        type_vis,
-// 469|        doc : DocString::empty(),
-// 470|        deriving: $2,
-// 471|        loc : mk_loc($sloc),
-// 472|        attrs,
-// 473|        is_declare
-// 474|      }
-// 475|    )
-// 476|  }
+// 468|    type_header deriving_directive_list {
+// 469|    let (attrs, type_vis, is_declare, tycon, tycon_loc, params) = $1
+// 470|    TopTypeDef(
+// 471|      TypeDecl::{
+// 472|        tycon,
+// 473|        tycon_loc,
+// 474|        params,
+// 475|        components: Abstract,
+// 476|        type_vis,
+// 477|        doc : DocString::empty(),
+// 478|        deriving: $2,
+// 479|        loc : mk_loc($sloc),
+// 480|        attrs,
+// 481|        is_declare
+// 482|      }
+// 483|    )
+// 484|  }
 
 ///|
 fn yy_action_199(
@@ -9729,23 +9979,23 @@ fn yy_action_199(
 }
 
 // file:///./parser.mbty
-// 493|    type_header type_ deriving_directive_list {
-// 494|    let (attrs, type_vis, is_declare, tycon, tycon_loc, params) = $1
-// 495|    TopTypeDef(
-// 496|      TypeDecl::{
-// 497|        tycon,
-// 498|        tycon_loc,
-// 499|        params,
-// 500|        components: Newtype($2),
-// 501|        type_vis,
-// 502|        doc : DocString::empty(),
-// 503|        deriving: $3,
-// 504|        loc : mk_loc($sloc),
-// 505|        attrs,
-// 506|        is_declare
-// 507|      }
-// 508|    )
-// 509|  }
+// 501|    type_header type_ deriving_directive_list {
+// 502|    let (attrs, type_vis, is_declare, tycon, tycon_loc, params) = $1
+// 503|    TopTypeDef(
+// 504|      TypeDecl::{
+// 505|        tycon,
+// 506|        tycon_loc,
+// 507|        params,
+// 508|        components: Newtype($2),
+// 509|        type_vis,
+// 510|        doc : DocString::empty(),
+// 511|        deriving: $3,
+// 512|        loc : mk_loc($sloc),
+// 513|        attrs,
+// 514|        is_declare
+// 515|      }
+// 516|    )
+// 517|  }
 
 ///|
 fn yy_action_200(
@@ -9785,23 +10035,23 @@ fn yy_action_200(
 }
 
 // file:///./parser.mbty
-// 736|    type_header "=" type_ deriving_directive_list {
-// 737|    let (attrs, type_vis, is_declare, tycon, tycon_loc, params) = $1
-// 738|    TopTypeDef(
-// 739|      TypeDecl::{
-// 740|        tycon,
-// 741|        tycon_loc,
-// 742|        params,
-// 743|        components: Alias($3),
-// 744|        type_vis,
-// 745|        doc : DocString::empty(),
-// 746|        deriving: $4,
-// 747|        loc : mk_loc($sloc),
-// 748|        attrs,
-// 749|        is_declare
-// 750|      }
-// 751|    )
-// 752|  }
+// 745|    type_header "=" type_ deriving_directive_list {
+// 746|    let (attrs, type_vis, is_declare, tycon, tycon_loc, params) = $1
+// 747|    TopTypeDef(
+// 748|      TypeDecl::{
+// 749|        tycon,
+// 750|        tycon_loc,
+// 751|        params,
+// 752|        components: Alias($3),
+// 753|        type_vis,
+// 754|        doc : DocString::empty(),
+// 755|        deriving: $4,
+// 756|        loc : mk_loc($sloc),
+// 757|        attrs,
+// 758|        is_declare
+// 759|      }
+// 760|    )
+// 761|  }
 
 ///|
 fn yy_action_201(
@@ -9841,28 +10091,28 @@ fn yy_action_201(
 }
 
 // file:///./parser.mbty
-// 510|    suberror_header option(type_) deriving_directive_list {
-// 511|    let (attrs, type_vis, is_declare, tycon, tycon_loc) = $1
-// 512|    let exception_decl : ExceptionDecl = match $2 {
-// 513|      None => NoPayload
-// 514|      Some(ty) => SinglePayload(ty)
-// 515|    }
-// 516|    TopTypeDef(
-// 517|      TypeDecl::{
-// 518|        tycon,
-// 519|        tycon_loc,
-// 520|        params: @list.empty(),
-// 521|        components: Error(exception_decl),
-// 522|        type_vis,
-// 523|        doc : DocString::empty(),
-// 524|        deriving: $3,
-// 525|        loc : mk_loc($sloc),
-// 526|        attrs,
-// 527|        is_declare
-// 528|      }
-// 529|    )
-// 530|
-// 531|  }
+// 518|    suberror_header option(type_) deriving_directive_list {
+// 519|    let (attrs, type_vis, is_declare, tycon, tycon_loc) = $1
+// 520|    let exception_decl : ExceptionDecl = match $2 {
+// 521|      None => NoPayload
+// 522|      Some(ty) => SinglePayload(ty)
+// 523|    }
+// 524|    TopTypeDef(
+// 525|      TypeDecl::{
+// 526|        tycon,
+// 527|        tycon_loc,
+// 528|        params: @list.empty(),
+// 529|        components: Error(exception_decl),
+// 530|        type_vis,
+// 531|        doc : DocString::empty(),
+// 532|        deriving: $3,
+// 533|        loc : mk_loc($sloc),
+// 534|        attrs,
+// 535|        is_declare
+// 536|      }
+// 537|    )
+// 538|
+// 539|  }
 
 ///|
 fn yy_action_202(
@@ -9904,24 +10154,24 @@ fn yy_action_202(
 }
 
 // file:///./parser.mbty
-// 532|    suberror_header "{" list_semis(enum_constructor) "}" deriving_directive_list {
-// 533|    let (attrs, type_vis, is_declare, tycon, tycon_loc) = $1
-// 534|    let exception_decl : ExceptionDecl = EnumPayload($3)
-// 535|    TopTypeDef(
-// 536|      TypeDecl::{
-// 537|        tycon,
-// 538|        tycon_loc,
-// 539|        params: @list.empty(),
-// 540|        components: Error(exception_decl),
-// 541|        type_vis,
-// 542|        doc : DocString::empty(),
-// 543|        deriving: $5,
-// 544|        loc : mk_loc($sloc),
-// 545|        attrs,
-// 546|        is_declare
-// 547|      }
-// 548|    )
-// 549|  }
+// 540|    suberror_header "{" list_semis(enum_constructor) "}" deriving_directive_list {
+// 541|    let (attrs, type_vis, is_declare, tycon, tycon_loc) = $1
+// 542|    let exception_decl : ExceptionDecl = EnumPayload($3)
+// 543|    TopTypeDef(
+// 544|      TypeDecl::{
+// 545|        tycon,
+// 546|        tycon_loc,
+// 547|        params: @list.empty(),
+// 548|        components: Error(exception_decl),
+// 549|        type_vis,
+// 550|        doc : DocString::empty(),
+// 551|        deriving: $5,
+// 552|        loc : mk_loc($sloc),
+// 553|        attrs,
+// 554|        is_declare
+// 555|      }
+// 556|    )
+// 557|  }
 
 ///|
 fn yy_action_203(
@@ -9993,23 +10243,24 @@ fn yy_action_205(
 }
 
 // file:///./parser.mbty
-// 550|    struct_header "{" list_semis(record_decl_field) "}" deriving_directive_list {
-// 551|    let (attrs, type_vis, tycon, tycon_loc, params) = $1
-// 552|    TopTypeDef(
-// 553|      TypeDecl::{
-// 554|        tycon,
-// 555|        tycon_loc,
-// 556|        params,
-// 557|        components: Record($3),
-// 558|        type_vis,
-// 559|        doc : DocString::empty(),
-// 560|        deriving: $5,
-// 561|        loc : mk_loc($sloc),
-// 562|        attrs,
-// 563|        is_declare : false
-// 564|      }
-// 565|    )
-// 566|  }
+// 558|    struct_header "{" record_decl_body "}" deriving_directive_list {
+// 559|    let (attrs, type_vis, tycon, tycon_loc, params) = $1
+// 560|    let (fields, constr_decl) = $3
+// 561|    TopTypeDef(
+// 562|      TypeDecl::{
+// 563|        tycon,
+// 564|        tycon_loc,
+// 565|        params,
+// 566|        components: Record(fields~, constr_decl~),
+// 567|        type_vis,
+// 568|        doc : DocString::empty(),
+// 569|        deriving: $5,
+// 570|        loc : mk_loc($sloc),
+// 571|        attrs,
+// 572|        is_declare : false
+// 573|      }
+// 574|    )
+// 575|  }
 
 ///|
 fn yy_action_206(
@@ -10020,7 +10271,7 @@ fn yy_action_206(
     is YYObj__List_Attribute___Visibility__String__Location__List_TypeDeclBinder__(
       _dollar1
     )
-  guard _args[2].0 is YYObj_List_FieldDecl_(_dollar3)
+  guard _args[2].0 is YYObj__List_FieldDecl___FunDecl__(_dollar3)
   guard _args[4].0 is YYObj_List_DerivingDirective_(_dollar5)
   let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
   let _end_pos = if _args.length() == 0 {
@@ -10032,11 +10283,12 @@ fn yy_action_206(
     {
       ()
       let (attrs, type_vis, tycon, tycon_loc, params) = _dollar1
+      let (fields, constr_decl) = _dollar3
       TopTypeDef(TypeDecl::{
         tycon,
         tycon_loc,
         params,
-        components: Record(_dollar3),
+        components: Record(fields~, constr_decl~),
         type_vis,
         doc: DocString::empty(),
         deriving: _dollar5,
@@ -10049,28 +10301,399 @@ fn yy_action_206(
 }
 
 // file:///./parser.mbty
-// 567|    struct_header "(" non_empty_list_commas(type_) ")" deriving_directive_list {
-// 568|    let (attrs, type_vis, tycon, tycon_loc, params) = $1
-// 569|    TopTypeDef(
-// 570|      TypeDecl::{
-// 571|        tycon,
-// 572|        tycon_loc,
-// 573|        params,
-// 574|        components: TupleStruct($3),
-// 575|        type_vis,
-// 576|        doc : DocString::empty(),
-// 577|        deriving: $5,
-// 578|        loc : mk_loc($sloc),
-// 579|        attrs,
-// 580|        is_declare : false
-// 581|      }
-// 582|    )
-// 583|  }
+// 2198|    record_constr_decl option(SEMI) {
+// 2199|    (@list.empty(), Some($1))
+// 2200|  }
 
 ///|
 fn yy_action_207(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
+) -> YYObj {
+  guard _args[0].0 is YYObj_FunDecl(_dollar1)
+  YYObj__List_FieldDecl___FunDecl__(
+    {
+      ()
+      (@list.empty(), Some(_dollar1))
+    },
+  )
+}
+
+// file:///./parser.mbty
+// 2178|    attributes is_async "fn" optional_type_parameters binder "(" list_commas(trait_method_param) ")" func_return_type {
+// 2179|    let (return_type, error_type) = $9
+// 2180|    FunDecl::{
+// 2181|      type_name : None,
+// 2182|      name : $5,
+// 2183|      has_error : None,
+// 2184|      is_async : $2,
+// 2185|      quantifiers: $4,
+// 2186|      decl_params: Some($7),
+// 2187|      params_loc: mk_loc($loc($7)),
+// 2188|      return_type,
+// 2189|      error_type,
+// 2190|      vis: Default,
+// 2191|      doc: DocString::empty(),
+// 2192|      attrs: $1,
+// 2193|      loc : mk_loc($loc)
+// 2194|    }
+// 2195|  }
+
+///|
+fn yy_action_208(
+  _last_pos : Position,
+  _args : ArrayView[(YYObj, Position, Position)],
+) -> YYObj {
+  let _sub_action_0_result = yy_action_60(_last_pos, _args[0:1])
+  let _sub_action_1_result = yy_action_5(_args[0].2, _args[1:2])
+  let _sub_action_2_result = yy_action_16(_args[3].2, _args[4:5])
+  guard _args[8].0 is YYObj__Type___ErrorType_(_dollar9)
+  guard _sub_action_2_result is YYObj_Binder(_dollar5)
+  guard _sub_action_1_result is YYObj_Location_(_dollar2)
+  guard _args[3].0 is YYObj_List_TypeVarBinder_(_dollar4)
+  guard _args[6].0 is YYObj_List_Parameter_(_dollar7)
+  let _start_pos_of_item6 = _args[6].1
+  let _end_pos_of_item6 = _args[6].2
+  guard _sub_action_0_result is YYObj_List_Attribute_(_dollar1)
+  let _start_pos = if _args.length() == 0 { _last_pos } else { _args[0].1 }
+  let _end_pos = if _args.length() == 0 {
+    _last_pos
+  } else {
+    _args[_args.length() - 1].2
+  }
+  YYObj_FunDecl(
+    {
+      ()
+      let (return_type, error_type) = _dollar9
+      FunDecl::{
+        type_name: None,
+        name: _dollar5,
+        has_error: None,
+        is_async: _dollar2,
+        quantifiers: _dollar4,
+        decl_params: Some(_dollar7),
+        params_loc: mk_loc((_start_pos_of_item6, _end_pos_of_item6)),
+        return_type,
+        error_type,
+        vis: Default,
+        doc: DocString::empty(),
+        attrs: _dollar1,
+        loc: mk_loc((_start_pos, _end_pos)),
+      }
+    },
+  )
+}
+
+// file:///./parser.mbty
+// 2178|    attributes is_async "fn" optional_type_parameters binder "(" list_commas(trait_method_param) ")" func_return_type {
+// 2179|    let (return_type, error_type) = $9
+// 2180|    FunDecl::{
+// 2181|      type_name : None,
+// 2182|      name : $5,
+// 2183|      has_error : None,
+// 2184|      is_async : $2,
+// 2185|      quantifiers: $4,
+// 2186|      decl_params: Some($7),
+// 2187|      params_loc: mk_loc($loc($7)),
+// 2188|      return_type,
+// 2189|      error_type,
+// 2190|      vis: Default,
+// 2191|      doc: DocString::empty(),
+// 2192|      attrs: $1,
+// 2193|      loc : mk_loc($loc)
+// 2194|    }
+// 2195|  }
+
+///|
+fn yy_action_209(
+  _last_pos : Position,
+  _args : ArrayView[(YYObj, Position, Position)],
+) -> YYObj {
+  let _sub_action_0_result = yy_action_60(_last_pos, _args[0:1])
+  let _sub_action_1_result = yy_action_8(_args[0].2, _args[1:1])
+  let _sub_action_2_result = yy_action_16(_args[2].2, _args[3:4])
+  guard _args[7].0 is YYObj__Type___ErrorType_(_dollar9)
+  guard _sub_action_2_result is YYObj_Binder(_dollar5)
+  guard _sub_action_1_result is YYObj_Location_(_dollar2)
+  guard _args[2].0 is YYObj_List_TypeVarBinder_(_dollar4)
+  guard _args[5].0 is YYObj_List_Parameter_(_dollar7)
+  let _start_pos_of_item6 = _args[5].1
+  let _end_pos_of_item6 = _args[5].2
+  guard _sub_action_0_result is YYObj_List_Attribute_(_dollar1)
+  let _start_pos = if _args.length() == 0 { _last_pos } else { _args[0].1 }
+  let _end_pos = if _args.length() == 0 {
+    _last_pos
+  } else {
+    _args[_args.length() - 1].2
+  }
+  YYObj_FunDecl(
+    {
+      ()
+      let (return_type, error_type) = _dollar9
+      FunDecl::{
+        type_name: None,
+        name: _dollar5,
+        has_error: None,
+        is_async: _dollar2,
+        quantifiers: _dollar4,
+        decl_params: Some(_dollar7),
+        params_loc: mk_loc((_start_pos_of_item6, _end_pos_of_item6)),
+        return_type,
+        error_type,
+        vis: Default,
+        doc: DocString::empty(),
+        attrs: _dollar1,
+        loc: mk_loc((_start_pos, _end_pos)),
+      }
+    },
+  )
+}
+
+// file:///./parser.mbty
+// 2178|    attributes is_async "fn" optional_type_parameters binder "(" list_commas(trait_method_param) ")" func_return_type {
+// 2179|    let (return_type, error_type) = $9
+// 2180|    FunDecl::{
+// 2181|      type_name : None,
+// 2182|      name : $5,
+// 2183|      has_error : None,
+// 2184|      is_async : $2,
+// 2185|      quantifiers: $4,
+// 2186|      decl_params: Some($7),
+// 2187|      params_loc: mk_loc($loc($7)),
+// 2188|      return_type,
+// 2189|      error_type,
+// 2190|      vis: Default,
+// 2191|      doc: DocString::empty(),
+// 2192|      attrs: $1,
+// 2193|      loc : mk_loc($loc)
+// 2194|    }
+// 2195|  }
+
+///|
+fn yy_action_210(
+  _last_pos : Position,
+  _args : ArrayView[(YYObj, Position, Position)],
+) -> YYObj {
+  let _sub_action_0_result = yy_action_3(_last_pos, _args[0:0])
+  let _sub_action_1_result = yy_action_5(_last_pos, _args[0:1])
+  let _sub_action_2_result = yy_action_16(_args[2].2, _args[3:4])
+  guard _args[7].0 is YYObj__Type___ErrorType_(_dollar9)
+  guard _sub_action_2_result is YYObj_Binder(_dollar5)
+  guard _sub_action_1_result is YYObj_Location_(_dollar2)
+  guard _args[2].0 is YYObj_List_TypeVarBinder_(_dollar4)
+  guard _args[5].0 is YYObj_List_Parameter_(_dollar7)
+  let _start_pos_of_item6 = _args[5].1
+  let _end_pos_of_item6 = _args[5].2
+  guard _sub_action_0_result is YYObj_List_Attribute_(_dollar1)
+  let _start_pos = if _args.length() == 0 { _last_pos } else { _args[0].1 }
+  let _end_pos = if _args.length() == 0 {
+    _last_pos
+  } else {
+    _args[_args.length() - 1].2
+  }
+  YYObj_FunDecl(
+    {
+      ()
+      let (return_type, error_type) = _dollar9
+      FunDecl::{
+        type_name: None,
+        name: _dollar5,
+        has_error: None,
+        is_async: _dollar2,
+        quantifiers: _dollar4,
+        decl_params: Some(_dollar7),
+        params_loc: mk_loc((_start_pos_of_item6, _end_pos_of_item6)),
+        return_type,
+        error_type,
+        vis: Default,
+        doc: DocString::empty(),
+        attrs: _dollar1,
+        loc: mk_loc((_start_pos, _end_pos)),
+      }
+    },
+  )
+}
+
+// file:///./parser.mbty
+// 2178|    attributes is_async "fn" optional_type_parameters binder "(" list_commas(trait_method_param) ")" func_return_type {
+// 2179|    let (return_type, error_type) = $9
+// 2180|    FunDecl::{
+// 2181|      type_name : None,
+// 2182|      name : $5,
+// 2183|      has_error : None,
+// 2184|      is_async : $2,
+// 2185|      quantifiers: $4,
+// 2186|      decl_params: Some($7),
+// 2187|      params_loc: mk_loc($loc($7)),
+// 2188|      return_type,
+// 2189|      error_type,
+// 2190|      vis: Default,
+// 2191|      doc: DocString::empty(),
+// 2192|      attrs: $1,
+// 2193|      loc : mk_loc($loc)
+// 2194|    }
+// 2195|  }
+
+///|
+fn yy_action_211(
+  _last_pos : Position,
+  _args : ArrayView[(YYObj, Position, Position)],
+) -> YYObj {
+  let _sub_action_0_result = yy_action_3(_last_pos, _args[0:0])
+  let _sub_action_1_result = yy_action_8(_last_pos, _args[0:0])
+  let _sub_action_2_result = yy_action_16(_args[1].2, _args[2:3])
+  guard _args[6].0 is YYObj__Type___ErrorType_(_dollar9)
+  guard _sub_action_2_result is YYObj_Binder(_dollar5)
+  guard _sub_action_1_result is YYObj_Location_(_dollar2)
+  guard _args[1].0 is YYObj_List_TypeVarBinder_(_dollar4)
+  guard _args[4].0 is YYObj_List_Parameter_(_dollar7)
+  let _start_pos_of_item6 = _args[4].1
+  let _end_pos_of_item6 = _args[4].2
+  guard _sub_action_0_result is YYObj_List_Attribute_(_dollar1)
+  let _start_pos = if _args.length() == 0 { _last_pos } else { _args[0].1 }
+  let _end_pos = if _args.length() == 0 {
+    _last_pos
+  } else {
+    _args[_args.length() - 1].2
+  }
+  YYObj_FunDecl(
+    {
+      ()
+      let (return_type, error_type) = _dollar9
+      FunDecl::{
+        type_name: None,
+        name: _dollar5,
+        has_error: None,
+        is_async: _dollar2,
+        quantifiers: _dollar4,
+        decl_params: Some(_dollar7),
+        params_loc: mk_loc((_start_pos_of_item6, _end_pos_of_item6)),
+        return_type,
+        error_type,
+        vis: Default,
+        doc: DocString::empty(),
+        attrs: _dollar1,
+        loc: mk_loc((_start_pos, _end_pos)),
+      }
+    },
+  )
+}
+
+// file:///./parser.mbty
+// 2204|    non_empty_list_semi_rev_aux(record_decl_field) SEMI record_constr_decl option(SEMI) {
+// 2205|    ($1.rev(), Some($3))
+// 2206|  }
+
+///|
+fn yy_action_212(
+  _last_pos : Position,
+  _args : ArrayView[(YYObj, Position, Position)],
+) -> YYObj {
+  guard _args[0].0 is YYObj_List_FieldDecl_(_dollar1)
+  guard _args[2].0 is YYObj_FunDecl(_dollar3)
+  YYObj__List_FieldDecl___FunDecl__(
+    {
+      ()
+      (_dollar1.rev(), Some(_dollar3))
+    },
+  )
+}
+
+// file:///./parser.mbty
+// 217|    non_empty_list_semi_rev_aux(X) SEMI X { $1.add($3) }
+
+///|
+fn yy_action_213(
+  _last_pos : Position,
+  _args : ArrayView[(YYObj, Position, Position)],
+) -> YYObj {
+  guard _args[0].0 is YYObj_List_FieldDecl_(_dollar1)
+  guard _args[2].0 is YYObj_FieldDecl(_dollar3)
+  YYObj_List_FieldDecl_(
+    {
+      ()
+      _dollar1.add(_dollar3)
+    },
+  )
+}
+
+// file:///./parser.mbty
+// 2207|    non_empty_list_semi_rev_aux(record_decl_field) option(SEMI) {
+// 2208|    ($1.rev(), None)
+// 2209|  }
+
+///|
+fn yy_action_214(
+  _last_pos : Position,
+  _args : ArrayView[(YYObj, Position, Position)],
+) -> YYObj {
+  guard _args[0].0 is YYObj_List_FieldDecl_(_dollar1)
+  YYObj__List_FieldDecl___FunDecl__(
+    {
+      ()
+      (_dollar1.rev(), None)
+    },
+  )
+}
+
+// file:///./parser.mbty
+// 216|    X { @list.singleton($1) }
+
+///|
+fn yy_action_215(
+  _last_pos : Position,
+  _args : ArrayView[(YYObj, Position, Position)],
+) -> YYObj {
+  guard _args[0].0 is YYObj_FieldDecl(_dollar1)
+  YYObj_List_FieldDecl_(
+    {
+      ()
+      @list.singleton(_dollar1)
+    },
+  )
+}
+
+// file:///./parser.mbty
+// 2201|    {
+// 2202|    (@list.empty(), None)
+// 2203|  }
+
+///|
+fn yy_action_216(
+  _last_pos : Position,
+  _args : ArrayView[(YYObj, Position, Position)],
+) -> YYObj {
+  YYObj__List_FieldDecl___FunDecl__(
+    {
+      ()
+      (@list.empty(), None)
+    },
+  )
+}
+
+// file:///./parser.mbty
+// 576|    struct_header "(" non_empty_list_commas(type_) ")" deriving_directive_list {
+// 577|    let (attrs, type_vis, tycon, tycon_loc, params) = $1
+// 578|    TopTypeDef(
+// 579|      TypeDecl::{
+// 580|        tycon,
+// 581|        tycon_loc,
+// 582|        params,
+// 583|        components: TupleStruct($3),
+// 584|        type_vis,
+// 585|        doc : DocString::empty(),
+// 586|        deriving: $5,
+// 587|        loc : mk_loc($sloc),
+// 588|        attrs,
+// 589|        is_declare : false
+// 590|      }
+// 591|    )
+// 592|  }
+
+///|
+fn yy_action_217(
+  _last_pos : Position,
+  _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
   guard _args[0].0
     is YYObj__List_Attribute___Visibility__String__Location__List_TypeDeclBinder__(
@@ -10105,26 +10728,26 @@ fn yy_action_207(
 }
 
 // file:///./parser.mbty
-// 584|    enum_header "{" list_semis(enum_constructor) "}" deriving_directive_list {
-// 585|    let (attrs, type_vis, tycon, tycon_loc, params) = $1
-// 586|    TopTypeDef(
-// 587|      TypeDecl::{
-// 588|        tycon,
-// 589|        tycon_loc,
-// 590|        params,
-// 591|        components: Variant($3),
-// 592|        type_vis,
-// 593|        doc : DocString::empty(),
-// 594|        deriving: $5,
-// 595|        loc : mk_loc($sloc),
-// 596|        attrs,
-// 597|        is_declare : false
-// 598|      }
-// 599|    )
-// 600|  }
+// 593|    enum_header "{" list_semis(enum_constructor) "}" deriving_directive_list {
+// 594|    let (attrs, type_vis, tycon, tycon_loc, params) = $1
+// 595|    TopTypeDef(
+// 596|      TypeDecl::{
+// 597|        tycon,
+// 598|        tycon_loc,
+// 599|        params,
+// 600|        components: Variant($3),
+// 601|        type_vis,
+// 602|        doc : DocString::empty(),
+// 603|        deriving: $5,
+// 604|        loc : mk_loc($sloc),
+// 605|        attrs,
+// 606|        is_declare : false
+// 607|      }
+// 608|    )
+// 609|  }
 
 ///|
-fn yy_action_208(
+fn yy_action_218(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -10161,23 +10784,23 @@ fn yy_action_208(
 }
 
 // file:///./parser.mbty
-// 601|    val_header "=" expr {
-// 602|    let (attrs, is_constant, is_declare, vis, binder, ty) = $1
-// 603|    TopLetDef(
-// 604|      binder~,
-// 605|      ty~,
-// 606|      expr = $3,
-// 607|      vis~,
-// 608|      is_constant~,
-// 609|      loc = mk_loc($sloc),
-// 610|      attrs~,
-// 611|      doc = DocString::empty(),
-// 612|      is_declare~
-// 613|    )
-// 614|  }
+// 610|    val_header "=" expr {
+// 611|    let (attrs, is_constant, is_declare, vis, binder, ty) = $1
+// 612|    TopLetDef(
+// 613|      binder~,
+// 614|      ty~,
+// 615|      expr = $3,
+// 616|      vis~,
+// 617|      is_constant~,
+// 618|      loc = mk_loc($sloc),
+// 619|      attrs~,
+// 620|      doc = DocString::empty(),
+// 621|      is_declare~
+// 622|    )
+// 623|  }
 
 ///|
-fn yy_action_209(
+fn yy_action_219(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -10210,17 +10833,17 @@ fn yy_action_209(
 }
 
 // file:///./parser.mbty
-// 615|    extern_fun_header "=" STRING STRING {
-// 616|    let (language, fun_decl) = $1
-// 617|    TopFuncDef(
-// 618|      loc = mk_loc($sloc),
-// 619|      fun_decl~,
-// 620|      decl_body = DeclStubs(Import(module_name = $3, func_name = $4, language = Some(language)))
-// 621|    )
-// 622|  }
+// 624|    extern_fun_header "=" STRING STRING {
+// 625|    let (language, fun_decl) = $1
+// 626|    TopFuncDef(
+// 627|      loc = mk_loc($sloc),
+// 628|      fun_decl~,
+// 629|      decl_body = DeclStubs(Import(module_name = $3, func_name = $4, language = Some(language)))
+// 630|    )
+// 631|  }
 
 ///|
-fn yy_action_210(
+fn yy_action_220(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -10253,17 +10876,17 @@ fn yy_action_210(
 }
 
 // file:///./parser.mbty
-// 645|    extern_fun_header "=" STRING {
-// 646|    let (language, decl) = $1
-// 647|    TopFuncDef(
-// 648|      loc = mk_loc($sloc),
-// 649|      fun_decl = decl,
-// 650|      decl_body = DeclStubs(Embedded(language = Some(language), code = CodeString($3)))
-// 651|    )
-// 652|  }
+// 654|    extern_fun_header "=" STRING {
+// 655|    let (language, decl) = $1
+// 656|    TopFuncDef(
+// 657|      loc = mk_loc($sloc),
+// 658|      fun_decl = decl,
+// 659|      decl_body = DeclStubs(Embedded(language = Some(language), code = CodeString($3)))
+// 660|    )
+// 661|  }
 
 ///|
-fn yy_action_211(
+fn yy_action_221(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -10291,17 +10914,17 @@ fn yy_action_211(
 }
 
 // file:///./parser.mbty
-// 653|    extern_fun_header "=" non_empty_list(MULTILINE_STRING) {
-// 654|    let (language, decl) = $1
-// 655|    TopFuncDef(
-// 656|      loc = mk_loc($sloc),
-// 657|      fun_decl = decl,
-// 658|      decl_body = DeclStubs(Embedded(language = Some(language), code = CodeMultilineString($3)))
-// 659|    )
-// 660|  }
+// 662|    extern_fun_header "=" non_empty_list(MULTILINE_STRING) {
+// 663|    let (language, decl) = $1
+// 664|    TopFuncDef(
+// 665|      loc = mk_loc($sloc),
+// 666|      fun_decl = decl,
+// 667|      decl_body = DeclStubs(Embedded(language = Some(language), code = CodeMultilineString($3)))
+// 668|    )
+// 669|  }
 
 ///|
-fn yy_action_212(
+fn yy_action_222(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -10329,16 +10952,16 @@ fn yy_action_212(
 }
 
 // file:///./parser.mbty
-// 624|    fun_header "=" STRING STRING {
-// 625|    TopFuncDef(
-// 626|      loc = mk_loc($sloc),
-// 627|      fun_decl = $1,
-// 628|      decl_body = DeclStubs(Import(module_name = $3, func_name = $4, language = None))
-// 629|    )
-// 630|  }
+// 633|    fun_header "=" STRING STRING {
+// 634|    TopFuncDef(
+// 635|      loc = mk_loc($sloc),
+// 636|      fun_decl = $1,
+// 637|      decl_body = DeclStubs(Import(module_name = $3, func_name = $4, language = None))
+// 638|    )
+// 639|  }
 
 ///|
-fn yy_action_213(
+fn yy_action_223(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -10366,16 +10989,16 @@ fn yy_action_213(
 }
 
 // file:///./parser.mbty
-// 631|    fun_header "=" STRING {
-// 632|    TopFuncDef(
-// 633|      loc = mk_loc($sloc),
-// 634|      fun_decl = $1,
-// 635|      decl_body = DeclStubs(Embedded(language = None, code = CodeString($3)))
-// 636|    )
-// 637|  }
+// 640|    fun_header "=" STRING {
+// 641|    TopFuncDef(
+// 642|      loc = mk_loc($sloc),
+// 643|      fun_decl = $1,
+// 644|      decl_body = DeclStubs(Embedded(language = None, code = CodeString($3)))
+// 645|    )
+// 646|  }
 
 ///|
-fn yy_action_214(
+fn yy_action_224(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -10400,16 +11023,16 @@ fn yy_action_214(
 }
 
 // file:///./parser.mbty
-// 638|    fun_header "=" non_empty_list(MULTILINE_STRING) {
-// 639|    TopFuncDef(
-// 640|      loc = mk_loc($sloc),
-// 641|      fun_decl = $1,
-// 642|      decl_body = DeclStubs(Embedded(language = None, code = CodeMultilineString($3)))
-// 643|    )
-// 644|  }
+// 647|    fun_header "=" non_empty_list(MULTILINE_STRING) {
+// 648|    TopFuncDef(
+// 649|      loc = mk_loc($sloc),
+// 650|      fun_decl = $1,
+// 651|      decl_body = DeclStubs(Embedded(language = None, code = CodeMultilineString($3)))
+// 652|    )
+// 653|  }
 
 ///|
-fn yy_action_215(
+fn yy_action_225(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -10436,10 +11059,10 @@ fn yy_action_215(
 }
 
 // file:///./parser.mbty
-// 169|    X non_empty_list(X) { $2.add($1) }
+// 174|    X non_empty_list(X) { $2.add($1) }
 
 ///|
-fn yy_action_216(
+fn yy_action_226(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -10454,10 +11077,10 @@ fn yy_action_216(
 }
 
 // file:///./parser.mbty
-// 168|    X { @list.singleton($1) }
+// 173|    X { @list.singleton($1) }
 
 ///|
-fn yy_action_217(
+fn yy_action_227(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -10471,17 +11094,17 @@ fn yy_action_217(
 }
 
 // file:///./parser.mbty
-// 661|    fun_header block_expr_with_local_types {
-// 662|    let (local_types, expr) = $2
-// 663|    TopFuncDef(
-// 664|      loc = mk_loc($sloc),
-// 665|      fun_decl = $1,
-// 666|      decl_body = DeclBody(local_types~, expr~)
-// 667|    )
-// 668|  }
+// 670|    fun_header block_expr_with_local_types {
+// 671|    let (local_types, expr) = $2
+// 672|    TopFuncDef(
+// 673|      loc = mk_loc($sloc),
+// 674|      fun_decl = $1,
+// 675|      decl_body = DeclBody(local_types~, expr~)
+// 676|    )
+// 677|  }
 
 ///|
-fn yy_action_218(
+fn yy_action_228(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -10507,16 +11130,16 @@ fn yy_action_218(
 }
 
 // file:///./parser.mbty
-// 669|    declare_fun_header {
-// 670|    TopFuncDef(
-// 671|      loc = mk_loc($sloc),
-// 672|      fun_decl = $1,
-// 673|      decl_body = DeclNone
-// 674|    )
-// 675|  }
+// 678|    declare_fun_header {
+// 679|    TopFuncDef(
+// 680|      loc = mk_loc($sloc),
+// 681|      fun_decl = $1,
+// 682|      decl_body = DeclNone
+// 683|    )
+// 684|  }
 
 ///|
-fn yy_action_219(
+fn yy_action_229(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -10540,22 +11163,22 @@ fn yy_action_219(
 }
 
 // file:///./parser.mbty
-// 676|    attributes visibility "fnalias" func_alias_targets {
-// 677|    let (pkg, type_name, is_list, targets) = $4
-// 678|    TopFuncAlias(
-// 679|      pkg~,
-// 680|      type_name~,
-// 681|      targets~,
-// 682|      vis = $2,
-// 683|      attrs = $1,
-// 684|      is_list~,
-// 685|      doc = DocString::empty(),
-// 686|      loc = mk_loc($sloc)
-// 687|    )
-// 688|  }
+// 685|    attributes visibility "fnalias" func_alias_targets {
+// 686|    let (pkg, type_name, is_list, targets) = $4
+// 687|    TopFuncAlias(
+// 688|      pkg~,
+// 689|      type_name~,
+// 690|      targets~,
+// 691|      vis = $2,
+// 692|      attrs = $1,
+// 693|      is_list~,
+// 694|      doc = DocString::empty(),
+// 695|      loc = mk_loc($sloc)
+// 696|    )
+// 697|  }
 
 ///|
-fn yy_action_220(
+fn yy_action_230(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -10589,16 +11212,16 @@ fn yy_action_220(
 }
 
 // file:///./parser.mbty
-// 930|    ioption(func_alias_type_name(LIDENT, UIDENT)) func_alias_target(LIDENT) { 
-// 931|    (None, $1, false, @list.singleton($2))
-// 932|  }
+// 939|    ioption(func_alias_type_name(LIDENT, UIDENT)) func_alias_target(LIDENT) { 
+// 940|    (None, $1, false, @list.singleton($2))
+// 941|  }
 
 ///|
-fn yy_action_221(
+fn yy_action_231(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_222(_last_pos, _args[0:0])
+  let _sub_action_0_result = yy_action_232(_last_pos, _args[0:0])
   guard _sub_action_0_result is YYObj_Option_Label_(_dollar1)
   guard _args[0].0 is YYObj_AliasTarget(_dollar2)
   YYObj__Label___Label___Bool__List_AliasTarget__(
@@ -10613,7 +11236,7 @@ fn yy_action_221(
 // 9|    { None }
 
 ///|
-fn yy_action_222(
+fn yy_action_232(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -10626,16 +11249,16 @@ fn yy_action_222(
 }
 
 // file:///./parser.mbty
-// 930|    ioption(func_alias_type_name(LIDENT, UIDENT)) func_alias_target(LIDENT) { 
-// 931|    (None, $1, false, @list.singleton($2))
-// 932|  }
+// 939|    ioption(func_alias_type_name(LIDENT, UIDENT)) func_alias_target(LIDENT) { 
+// 940|    (None, $1, false, @list.singleton($2))
+// 941|  }
 
 ///|
-fn yy_action_223(
+fn yy_action_233(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_224(_last_pos, _args[0:1])
+  let _sub_action_0_result = yy_action_234(_last_pos, _args[0:1])
   guard _sub_action_0_result is YYObj_Option_Label_(_dollar1)
   guard _args[1].0 is YYObj_AliasTarget(_dollar2)
   YYObj__Label___Label___Bool__List_AliasTarget__(
@@ -10650,7 +11273,7 @@ fn yy_action_223(
 // 10|    X { Some($1) }
 
 ///|
-fn yy_action_224(
+fn yy_action_234(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -10667,7 +11290,7 @@ fn yy_action_224(
 // 5|    X { Some($1) }
 
 ///|
-fn yy_action_225(
+fn yy_action_235(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -10681,13 +11304,13 @@ fn yy_action_225(
 }
 
 // file:///./parser.mbty
-// 933|    PACKAGE_NAME func_alias_target(DOT_LIDENT) { 
-// 934|    let pkg = Label::{ name: $1, loc: mk_loc($loc($1)) }
-// 935|    (Some(pkg), None, false, @list.singleton($2))
-// 936|  }
+// 942|    PACKAGE_NAME func_alias_target(DOT_LIDENT) { 
+// 943|    let pkg = Label::{ name: $1, loc: mk_loc($loc($1)) }
+// 944|    (Some(pkg), None, false, @list.singleton($2))
+// 945|  }
 
 ///|
-fn yy_action_226(
+fn yy_action_236(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -10708,13 +11331,13 @@ fn yy_action_226(
 }
 
 // file:///./parser.mbty
-// 937|    PACKAGE_NAME func_alias_type_name(DOT_LIDENT, DOT_UIDENT) func_alias_target(LIDENT) { 
-// 938|    let pkg = Label::{ name: $1, loc: mk_loc($loc($1)) }
-// 939|    (Some(pkg), Some($2), false, @list.singleton($3))
-// 940|  }
+// 946|    PACKAGE_NAME func_alias_type_name(DOT_LIDENT, DOT_UIDENT) func_alias_target(LIDENT) { 
+// 947|    let pkg = Label::{ name: $1, loc: mk_loc($loc($1)) }
+// 948|    (Some(pkg), Some($2), false, @list.singleton($3))
+// 949|  }
 
 ///|
-fn yy_action_227(
+fn yy_action_237(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -10736,13 +11359,13 @@ fn yy_action_227(
 }
 
 // file:///./parser.mbty
-// 948|    PACKAGE_NAME func_alias_type_name(DOT_LIDENT, DOT_UIDENT) "(" non_empty_list_commas(func_alias_target(LIDENT)) ")" { 
-// 949|    let pkg = Label::{ name: $1, loc: mk_loc($loc($1)) }
-// 950|    (Some(pkg), Some($2), true, $4)
-// 951|  }
+// 957|    PACKAGE_NAME func_alias_type_name(DOT_LIDENT, DOT_UIDENT) "(" non_empty_list_commas(func_alias_target(LIDENT)) ")" { 
+// 958|    let pkg = Label::{ name: $1, loc: mk_loc($loc($1)) }
+// 959|    (Some(pkg), Some($2), true, $4)
+// 960|  }
 
 ///|
-fn yy_action_228(
+fn yy_action_238(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -10764,13 +11387,13 @@ fn yy_action_228(
 }
 
 // file:///./parser.mbty
-// 944|    PACKAGE_NAME ".(" non_empty_list_commas(func_alias_target(LIDENT)) ")" { 
-// 945|    let pkg = Label::{ name: $1, loc: mk_loc($loc($1)) }
-// 946|    (Some(pkg), None, true, $3)
-// 947|  }
+// 953|    PACKAGE_NAME ".(" non_empty_list_commas(func_alias_target(LIDENT)) ")" { 
+// 954|    let pkg = Label::{ name: $1, loc: mk_loc($loc($1)) }
+// 955|    (Some(pkg), None, true, $3)
+// 956|  }
 
 ///|
-fn yy_action_229(
+fn yy_action_239(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -10791,21 +11414,21 @@ fn yy_action_229(
 }
 
 // file:///./parser.mbty
-// 960|    LIDENT_MAYBE_DOT option(preceded("as", binder)) { 
-// 961|    match $2 {
-// 962|      None => {
-// 963|        let binder = Binder::{ name: $1, loc: mk_loc($loc($1)) }
-// 964|        AliasTarget::{ binder, target: None }
-// 965|      }
-// 966|      Some(binder) => {
-// 967|        let target = Label::{ name: $1, loc: mk_loc($loc($1)) }
-// 968|        AliasTarget::{ binder, target: Some(target) }
-// 969|      }
-// 970|    }
-// 971|  }
+// 969|    LIDENT_MAYBE_DOT option(preceded("as", binder)) { 
+// 970|    match $2 {
+// 971|      None => {
+// 972|        let binder = Binder::{ name: $1, loc: mk_loc($loc($1)) }
+// 973|        AliasTarget::{ binder, target: None }
+// 974|      }
+// 975|      Some(binder) => {
+// 976|        let target = Label::{ name: $1, loc: mk_loc($loc($1)) }
+// 977|        AliasTarget::{ binder, target: Some(target) }
+// 978|      }
+// 979|    }
+// 980|  }
 
 ///|
-fn yy_action_230(
+fn yy_action_240(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -10837,10 +11460,10 @@ fn yy_action_230(
 }
 
 // file:///./parser.mbty
-// 955|    LIDENT_MAYBE_DOT "::" { Label::{ name: $1, loc: mk_loc($loc($1)) } }
+// 964|    LIDENT_MAYBE_DOT "::" { Label::{ name: $1, loc: mk_loc($loc($1)) } }
 
 ///|
-fn yy_action_231(
+fn yy_action_241(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -10859,10 +11482,10 @@ fn yy_action_231(
 }
 
 // file:///./parser.mbty
-// 956|    UIDENT_MAYBE_DOT "::" { Label::{ name: $1, loc: mk_loc($loc($1)) } }
+// 965|    UIDENT_MAYBE_DOT "::" { Label::{ name: $1, loc: mk_loc($loc($1)) } }
 
 ///|
-fn yy_action_232(
+fn yy_action_242(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -10881,12 +11504,12 @@ fn yy_action_232(
 }
 
 // file:///./parser.mbty
-// 941|    option(func_alias_type_name(LIDENT, UIDENT)) "(" non_empty_list_commas(func_alias_target(LIDENT)) ")" { 
-// 942|    (None, $1, true, $3)
-// 943|  }
+// 950|    option(func_alias_type_name(LIDENT, UIDENT)) "(" non_empty_list_commas(func_alias_target(LIDENT)) ")" { 
+// 951|    (None, $1, true, $3)
+// 952|  }
 
 ///|
-fn yy_action_233(
+fn yy_action_243(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -10901,10 +11524,10 @@ fn yy_action_233(
 }
 
 // file:///./parser.mbty
-// 182|    non_empty_list_commas_rev(X) option(",") { $1.rev() }
+// 187|    non_empty_list_commas_rev(X) option(",") { $1.rev() }
 
 ///|
-fn yy_action_234(
+fn yy_action_244(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -10918,10 +11541,10 @@ fn yy_action_234(
 }
 
 // file:///./parser.mbty
-// 174|    non_empty_list_commas_rev(X) "," X { $1.add($3) }
+// 179|    non_empty_list_commas_rev(X) "," X { $1.add($3) }
 
 ///|
-fn yy_action_235(
+fn yy_action_245(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -10936,10 +11559,10 @@ fn yy_action_235(
 }
 
 // file:///./parser.mbty
-// 173|    X { @list.singleton($1) }
+// 178|    X { @list.singleton($1) }
 
 ///|
-fn yy_action_236(
+fn yy_action_246(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -10953,10 +11576,10 @@ fn yy_action_236(
 }
 
 // file:///./parser.mbty
-// 955|    LIDENT_MAYBE_DOT "::" { Label::{ name: $1, loc: mk_loc($loc($1)) } }
+// 964|    LIDENT_MAYBE_DOT "::" { Label::{ name: $1, loc: mk_loc($loc($1)) } }
 
 ///|
-fn yy_action_237(
+fn yy_action_247(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -10975,21 +11598,21 @@ fn yy_action_237(
 }
 
 // file:///./parser.mbty
-// 960|    LIDENT_MAYBE_DOT option(preceded("as", binder)) { 
-// 961|    match $2 {
-// 962|      None => {
-// 963|        let binder = Binder::{ name: $1, loc: mk_loc($loc($1)) }
-// 964|        AliasTarget::{ binder, target: None }
-// 965|      }
-// 966|      Some(binder) => {
-// 967|        let target = Label::{ name: $1, loc: mk_loc($loc($1)) }
-// 968|        AliasTarget::{ binder, target: Some(target) }
-// 969|      }
-// 970|    }
-// 971|  }
+// 969|    LIDENT_MAYBE_DOT option(preceded("as", binder)) { 
+// 970|    match $2 {
+// 971|      None => {
+// 972|        let binder = Binder::{ name: $1, loc: mk_loc($loc($1)) }
+// 973|        AliasTarget::{ binder, target: None }
+// 974|      }
+// 975|      Some(binder) => {
+// 976|        let target = Label::{ name: $1, loc: mk_loc($loc($1)) }
+// 977|        AliasTarget::{ binder, target: Some(target) }
+// 978|      }
+// 979|    }
+// 980|  }
 
 ///|
-fn yy_action_238(
+fn yy_action_248(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -11024,11 +11647,11 @@ fn yy_action_238(
 // 5|    X { Some($1) }
 
 ///|
-fn yy_action_239(
+fn yy_action_249(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_240(_last_pos, _args[0:2])
+  let _sub_action_0_result = yy_action_250(_last_pos, _args[0:2])
   guard _sub_action_0_result is YYObj_Binder(_dollar1)
   YYObj_Option_Binder_(
     {
@@ -11042,7 +11665,7 @@ fn yy_action_239(
 // 32|    L X { $2 }
 
 ///|
-fn yy_action_240(
+fn yy_action_250(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -11060,7 +11683,7 @@ fn yy_action_240(
 // 4|    { None }
 
 ///|
-fn yy_action_241(
+fn yy_action_251(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -11073,10 +11696,10 @@ fn yy_action_241(
 }
 
 // file:///./parser.mbty
-// 956|    UIDENT_MAYBE_DOT "::" { Label::{ name: $1, loc: mk_loc($loc($1)) } }
+// 965|    UIDENT_MAYBE_DOT "::" { Label::{ name: $1, loc: mk_loc($loc($1)) } }
 
 ///|
-fn yy_action_242(
+fn yy_action_252(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -11098,7 +11721,7 @@ fn yy_action_242(
 // 4|    { None }
 
 ///|
-fn yy_action_243(
+fn yy_action_253(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -11111,28 +11734,28 @@ fn yy_action_243(
 }
 
 // file:///./parser.mbty
-// 689|    attributes is_declare visibility "trait" UIDENT option(preceded(COLON, separated_nonempty_list(PLUS, tvar_constraint))) "{" list_semis(trait_method_decl) "}" {
-// 690|    let name = Binder::{ name: $5, loc: mk_loc($loc($4)) }
-// 691|    let supers = match $6 {
-// 692|      None => @list.empty()
-// 693|      Some(supers) => supers
-// 694|    }
-// 695|    TopTrait(
-// 696|      TraitDecl::{
-// 697|        name,
-// 698|        supers,
-// 699|        methods: $8,
-// 700|        vis: $3,
-// 701|        loc: mk_loc($sloc),
-// 702|        attrs: $1,
-// 703|        doc : DocString::empty(),
-// 704|        is_declare : $2
-// 705|      }
-// 706|    )
-// 707|  }
+// 698|    attributes is_declare visibility "trait" UIDENT option(preceded(COLON, separated_nonempty_list(PLUS, tvar_constraint))) "{" list_semis(trait_method_decl) "}" {
+// 699|    let name = Binder::{ name: $5, loc: mk_loc($loc($4)) }
+// 700|    let supers = match $6 {
+// 701|      None => @list.empty()
+// 702|      Some(supers) => supers
+// 703|    }
+// 704|    TopTrait(
+// 705|      TraitDecl::{
+// 706|        name,
+// 707|        supers,
+// 708|        methods: $8,
+// 709|        vis: $3,
+// 710|        loc: mk_loc($sloc),
+// 711|        attrs: $1,
+// 712|        doc : DocString::empty(),
+// 713|        is_declare : $2
+// 714|      }
+// 715|    )
+// 716|  }
 
 ///|
-fn yy_action_244(
+fn yy_action_254(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -11179,10 +11802,10 @@ fn yy_action_244(
 }
 
 // file:///./parser.mbty
-// 235|    non_empty_list_semis(X) { $1 }
+// 240|    non_empty_list_semis(X) { $1 }
 
 ///|
-fn yy_action_245(
+fn yy_action_255(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -11196,24 +11819,24 @@ fn yy_action_245(
 }
 
 // file:///./parser.mbty
-// 1043|    attributes is_async binder optional_bang optional_type_parameters "(" list_commas(trait_method_param) ")" func_return_type option(preceded("=", wildcard)) { 
-// 1044|    let (return_type, error_type) = $9
-// 1045|    TraitMethodDecl::{
-// 1046|      name: $3,
-// 1047|      has_error: $4,
-// 1048|      is_async: $2,
-// 1049|      quantifiers: $5,
-// 1050|      params: $7,
-// 1051|      return_type,
-// 1052|      error_type,
-// 1053|      has_default: $10,
-// 1054|      attrs: $1,
-// 1055|      loc: mk_loc($sloc)
-// 1056|    }
-// 1057|  }
+// 1052|    attributes is_async binder optional_bang optional_type_parameters "(" list_commas(trait_method_param) ")" func_return_type option(preceded("=", wildcard)) { 
+// 1053|    let (return_type, error_type) = $9
+// 1054|    TraitMethodDecl::{
+// 1055|      name: $3,
+// 1056|      has_error: $4,
+// 1057|      is_async: $2,
+// 1058|      quantifiers: $5,
+// 1059|      params: $7,
+// 1060|      return_type,
+// 1061|      error_type,
+// 1062|      has_default: $10,
+// 1063|      attrs: $1,
+// 1064|      loc: mk_loc($sloc)
+// 1065|    }
+// 1066|  }
 
 ///|
-fn yy_action_246(
+fn yy_action_256(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -11255,24 +11878,24 @@ fn yy_action_246(
 }
 
 // file:///./parser.mbty
-// 1043|    attributes is_async binder optional_bang optional_type_parameters "(" list_commas(trait_method_param) ")" func_return_type option(preceded("=", wildcard)) { 
-// 1044|    let (return_type, error_type) = $9
-// 1045|    TraitMethodDecl::{
-// 1046|      name: $3,
-// 1047|      has_error: $4,
-// 1048|      is_async: $2,
-// 1049|      quantifiers: $5,
-// 1050|      params: $7,
-// 1051|      return_type,
-// 1052|      error_type,
-// 1053|      has_default: $10,
-// 1054|      attrs: $1,
-// 1055|      loc: mk_loc($sloc)
-// 1056|    }
-// 1057|  }
+// 1052|    attributes is_async binder optional_bang optional_type_parameters "(" list_commas(trait_method_param) ")" func_return_type option(preceded("=", wildcard)) { 
+// 1053|    let (return_type, error_type) = $9
+// 1054|    TraitMethodDecl::{
+// 1055|      name: $3,
+// 1056|      has_error: $4,
+// 1057|      is_async: $2,
+// 1058|      quantifiers: $5,
+// 1059|      params: $7,
+// 1060|      return_type,
+// 1061|      error_type,
+// 1062|      has_default: $10,
+// 1063|      attrs: $1,
+// 1064|      loc: mk_loc($sloc)
+// 1065|    }
+// 1066|  }
 
 ///|
-fn yy_action_247(
+fn yy_action_257(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -11314,24 +11937,24 @@ fn yy_action_247(
 }
 
 // file:///./parser.mbty
-// 1043|    attributes is_async binder optional_bang optional_type_parameters "(" list_commas(trait_method_param) ")" func_return_type option(preceded("=", wildcard)) { 
-// 1044|    let (return_type, error_type) = $9
-// 1045|    TraitMethodDecl::{
-// 1046|      name: $3,
-// 1047|      has_error: $4,
-// 1048|      is_async: $2,
-// 1049|      quantifiers: $5,
-// 1050|      params: $7,
-// 1051|      return_type,
-// 1052|      error_type,
-// 1053|      has_default: $10,
-// 1054|      attrs: $1,
-// 1055|      loc: mk_loc($sloc)
-// 1056|    }
-// 1057|  }
+// 1052|    attributes is_async binder optional_bang optional_type_parameters "(" list_commas(trait_method_param) ")" func_return_type option(preceded("=", wildcard)) { 
+// 1053|    let (return_type, error_type) = $9
+// 1054|    TraitMethodDecl::{
+// 1055|      name: $3,
+// 1056|      has_error: $4,
+// 1057|      is_async: $2,
+// 1058|      quantifiers: $5,
+// 1059|      params: $7,
+// 1060|      return_type,
+// 1061|      error_type,
+// 1062|      has_default: $10,
+// 1063|      attrs: $1,
+// 1064|      loc: mk_loc($sloc)
+// 1065|    }
+// 1066|  }
 
 ///|
-fn yy_action_248(
+fn yy_action_258(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -11373,24 +11996,24 @@ fn yy_action_248(
 }
 
 // file:///./parser.mbty
-// 1043|    attributes is_async binder optional_bang optional_type_parameters "(" list_commas(trait_method_param) ")" func_return_type option(preceded("=", wildcard)) { 
-// 1044|    let (return_type, error_type) = $9
-// 1045|    TraitMethodDecl::{
-// 1046|      name: $3,
-// 1047|      has_error: $4,
-// 1048|      is_async: $2,
-// 1049|      quantifiers: $5,
-// 1050|      params: $7,
-// 1051|      return_type,
-// 1052|      error_type,
-// 1053|      has_default: $10,
-// 1054|      attrs: $1,
-// 1055|      loc: mk_loc($sloc)
-// 1056|    }
-// 1057|  }
+// 1052|    attributes is_async binder optional_bang optional_type_parameters "(" list_commas(trait_method_param) ")" func_return_type option(preceded("=", wildcard)) { 
+// 1053|    let (return_type, error_type) = $9
+// 1054|    TraitMethodDecl::{
+// 1055|      name: $3,
+// 1056|      has_error: $4,
+// 1057|      is_async: $2,
+// 1058|      quantifiers: $5,
+// 1059|      params: $7,
+// 1060|      return_type,
+// 1061|      error_type,
+// 1062|      has_default: $10,
+// 1063|      attrs: $1,
+// 1064|      loc: mk_loc($sloc)
+// 1065|    }
+// 1066|  }
 
 ///|
-fn yy_action_249(
+fn yy_action_259(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -11432,10 +12055,10 @@ fn yy_action_249(
 }
 
 // file:///./parser.mbty
-// 1061|    "_" { mk_loc($sloc) }
+// 1070|    "_" { mk_loc($sloc) }
 
 ///|
-fn yy_action_250(
+fn yy_action_260(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -11457,11 +12080,11 @@ fn yy_action_250(
 // 5|    X { Some($1) }
 
 ///|
-fn yy_action_251(
+fn yy_action_261(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_252(_last_pos, _args[0:2])
+  let _sub_action_0_result = yy_action_262(_last_pos, _args[0:2])
   guard _sub_action_0_result is YYObj_Location(_dollar1)
   YYObj_Option_Location_(
     {
@@ -11475,7 +12098,7 @@ fn yy_action_251(
 // 32|    L X { $2 }
 
 ///|
-fn yy_action_252(
+fn yy_action_262(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -11492,7 +12115,7 @@ fn yy_action_252(
 // 4|    { None }
 
 ///|
-fn yy_action_253(
+fn yy_action_263(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -11505,10 +12128,10 @@ fn yy_action_253(
 }
 
 // file:///./parser.mbty
-// 191|    non_empty_list_commas(X) { $1 }
+// 196|    non_empty_list_commas(X) { $1 }
 
 ///|
-fn yy_action_254(
+fn yy_action_264(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -11522,10 +12145,10 @@ fn yy_action_254(
 }
 
 // file:///./parser.mbty
-// 1065|    type_ { DiscardPositional(ty = Some($1), loc = mk_loc($sloc)) }
+// 1074|    type_ { DiscardPositional(ty = Some($1), loc = mk_loc($sloc)) }
 
 ///|
-fn yy_action_255(
+fn yy_action_265(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -11548,10 +12171,10 @@ fn yy_action_255(
 }
 
 // file:///./parser.mbty
-// 1066|    binder ":" type_ { Positional(binder = $1, ty = Some($3)) }
+// 1075|    binder ":" type_ { Positional(binder = $1, ty = Some($3)) }
 
 ///|
-fn yy_action_256(
+fn yy_action_266(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -11567,10 +12190,10 @@ fn yy_action_256(
 }
 
 // file:///./parser.mbty
-// 1067|    binder "?" ":" type_ { QuestionOptional(binder = $1, ty = Some($4)) }
+// 1076|    binder "?" ":" type_ { QuestionOptional(binder = $1, ty = Some($4)) }
 
 ///|
-fn yy_action_257(
+fn yy_action_267(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -11586,13 +12209,13 @@ fn yy_action_257(
 }
 
 // file:///./parser.mbty
-// 1068|    POST_LABEL ":" type_ { 
-// 1069|    let binder = Binder::{ name: $1, loc: mk_loc($loc($1)).trim_last_char() }
-// 1070|    Labelled(binder~, ty = Some($3))
-// 1071|  }
+// 1077|    POST_LABEL ":" type_ { 
+// 1078|    let binder = Binder::{ name: $1, loc: mk_loc($loc($1)).trim_last_char() }
+// 1079|    Labelled(binder~, ty = Some($3))
+// 1080|  }
 
 ///|
-fn yy_action_258(
+fn yy_action_268(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -11613,10 +12236,10 @@ fn yy_action_258(
 }
 
 // file:///./parser.mbty
-// 174|    non_empty_list_commas_rev(X) "," X { $1.add($3) }
+// 179|    non_empty_list_commas_rev(X) "," X { $1.add($3) }
 
 ///|
-fn yy_action_259(
+fn yy_action_269(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -11631,10 +12254,10 @@ fn yy_action_259(
 }
 
 // file:///./parser.mbty
-// 182|    non_empty_list_commas_rev(X) option(",") { $1.rev() }
+// 187|    non_empty_list_commas_rev(X) option(",") { $1.rev() }
 
 ///|
-fn yy_action_260(
+fn yy_action_270(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -11648,10 +12271,10 @@ fn yy_action_260(
 }
 
 // file:///./parser.mbty
-// 173|    X { @list.singleton($1) }
+// 178|    X { @list.singleton($1) }
 
 ///|
-fn yy_action_261(
+fn yy_action_271(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -11665,10 +12288,10 @@ fn yy_action_261(
 }
 
 // file:///./parser.mbty
-// 190|    { @list.empty() }
+// 195|    { @list.empty() }
 
 ///|
-fn yy_action_262(
+fn yy_action_272(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -11681,10 +12304,10 @@ fn yy_action_262(
 }
 
 // file:///./parser.mbty
-// 225|    X SEMI non_empty_list_semis(X) { $3.add($1) }
+// 230|    X SEMI non_empty_list_semis(X) { $3.add($1) }
 
 ///|
-fn yy_action_263(
+fn yy_action_273(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -11699,10 +12322,10 @@ fn yy_action_263(
 }
 
 // file:///./parser.mbty
-// 224|    X option(SEMI) { @list.singleton($1) }
+// 229|    X option(SEMI) { @list.singleton($1) }
 
 ///|
-fn yy_action_264(
+fn yy_action_274(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -11716,10 +12339,10 @@ fn yy_action_264(
 }
 
 // file:///./parser.mbty
-// 234|    { @list.empty() }
+// 239|    { @list.empty() }
 
 ///|
-fn yy_action_265(
+fn yy_action_275(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -11735,11 +12358,11 @@ fn yy_action_265(
 // 5|    X { Some($1) }
 
 ///|
-fn yy_action_266(
+fn yy_action_276(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_267(_last_pos, _args[0:2])
+  let _sub_action_0_result = yy_action_277(_last_pos, _args[0:2])
   guard _sub_action_0_result is YYObj__list_List_TypeVarConstraint_(_dollar1)
   YYObj_Option__list_List_TypeVarConstraint__(
     {
@@ -11753,7 +12376,7 @@ fn yy_action_266(
 // 32|    L X { $2 }
 
 ///|
-fn yy_action_267(
+fn yy_action_277(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -11770,7 +12393,7 @@ fn yy_action_267(
 // 4|    { None }
 
 ///|
-fn yy_action_268(
+fn yy_action_278(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -11783,21 +12406,21 @@ fn yy_action_268(
 }
 
 // file:///./parser.mbty
-// 708|    attributes visibility "typealias" batch_type_alias_targets {
-// 709|    let (is_list, pkg, targets) = $4
-// 710|    TopBatchTypeAlias(
-// 711|      pkg~,
-// 712|      targets~,
-// 713|      vis = $2,
-// 714|      attrs = $1,
-// 715|      is_list~,
-// 716|      doc = DocString::empty(),
-// 717|      loc = mk_loc($sloc)
-// 718|    )
-// 719|  }
+// 717|    attributes visibility "typealias" batch_type_alias_targets {
+// 718|    let (is_list, pkg, targets) = $4
+// 719|    TopBatchTypeAlias(
+// 720|      pkg~,
+// 721|      targets~,
+// 722|      vis = $2,
+// 723|      attrs = $1,
+// 724|      is_list~,
+// 725|      doc = DocString::empty(),
+// 726|      loc = mk_loc($sloc)
+// 727|    )
+// 728|  }
 
 ///|
-fn yy_action_269(
+fn yy_action_279(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -11830,25 +12453,25 @@ fn yy_action_269(
 }
 
 // file:///./parser.mbty
-// 720|    attributes visibility "typealias" type_ "as" UIDENT optional_type_parameters_no_constraints {
-// 721|    TopTypeDef(
-// 722|      TypeDecl::{
-// 723|        tycon : $6,
-// 724|        tycon_loc : mk_loc($loc($6)),
-// 725|        params : $7,
-// 726|        components: Alias($4),
-// 727|        type_vis : $2,
-// 728|        doc : DocString::empty(),
-// 729|        deriving: @list.empty(),
-// 730|        loc : mk_loc($sloc),
-// 731|        attrs : $1,
-// 732|        is_declare : false
-// 733|      }
-// 734|    )
-// 735|  }
+// 729|    attributes visibility "typealias" type_ "as" UIDENT optional_type_parameters_no_constraints {
+// 730|    TopTypeDef(
+// 731|      TypeDecl::{
+// 732|        tycon : $6,
+// 733|        tycon_loc : mk_loc($loc($6)),
+// 734|        params : $7,
+// 735|        components: Alias($4),
+// 736|        type_vis : $2,
+// 737|        doc : DocString::empty(),
+// 738|        deriving: @list.empty(),
+// 739|        loc : mk_loc($sloc),
+// 740|        attrs : $1,
+// 741|        is_declare : false
+// 742|      }
+// 743|    )
+// 744|  }
 
 ///|
-fn yy_action_270(
+fn yy_action_280(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -11887,21 +12510,21 @@ fn yy_action_270(
 }
 
 // file:///./parser.mbty
-// 753|    attributes visibility "traitalias" batch_type_alias_targets {
-// 754|    let (is_list, pkg, targets) = $4
-// 755|    TopBatchTraitAlias(
-// 756|      pkg~,
-// 757|      targets~,
-// 758|      vis = $2,
-// 759|      attrs = $1,
-// 760|      is_list~,
-// 761|      doc = DocString::empty(),
-// 762|      loc = mk_loc($sloc)
-// 763|    )
-// 764|  }
+// 762|    attributes visibility "traitalias" batch_type_alias_targets {
+// 763|    let (is_list, pkg, targets) = $4
+// 764|    TopBatchTraitAlias(
+// 765|      pkg~,
+// 766|      targets~,
+// 767|      vis = $2,
+// 768|      attrs = $1,
+// 769|      is_list~,
+// 770|      doc = DocString::empty(),
+// 771|      loc = mk_loc($sloc)
+// 772|    )
+// 773|  }
 
 ///|
-fn yy_action_271(
+fn yy_action_281(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -11934,13 +12557,13 @@ fn yy_action_271(
 }
 
 // file:///./parser.mbty
-// 906|    PACKAGE_NAME batch_type_alias_target(DOT_UIDENT) { 
-// 907|    let pkg = Label::{ name: $1, loc: mk_loc($loc($1)) }
-// 908|    (false, Some(pkg), @list.singleton($2))
-// 909|  }
+// 915|    PACKAGE_NAME batch_type_alias_target(DOT_UIDENT) { 
+// 916|    let pkg = Label::{ name: $1, loc: mk_loc($loc($1)) }
+// 917|    (false, Some(pkg), @list.singleton($2))
+// 918|  }
 
 ///|
-fn yy_action_272(
+fn yy_action_282(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -11961,13 +12584,13 @@ fn yy_action_272(
 }
 
 // file:///./parser.mbty
-// 910|    PACKAGE_NAME ".(" non_empty_list_commas(batch_type_alias_target(UIDENT)) ")" { 
-// 911|    let pkg = Label::{ name: $1, loc: mk_loc($loc($1)) }
-// 912|    (true, Some(pkg), $3)
-// 913|  }
+// 919|    PACKAGE_NAME ".(" non_empty_list_commas(batch_type_alias_target(UIDENT)) ")" { 
+// 920|    let pkg = Label::{ name: $1, loc: mk_loc($loc($1)) }
+// 921|    (true, Some(pkg), $3)
+// 922|  }
 
 ///|
-fn yy_action_273(
+fn yy_action_283(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -11988,10 +12611,10 @@ fn yy_action_273(
 }
 
 // file:///./parser.mbty
-// 182|    non_empty_list_commas_rev(X) option(",") { $1.rev() }
+// 187|    non_empty_list_commas_rev(X) option(",") { $1.rev() }
 
 ///|
-fn yy_action_274(
+fn yy_action_284(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -12005,10 +12628,10 @@ fn yy_action_274(
 }
 
 // file:///./parser.mbty
-// 174|    non_empty_list_commas_rev(X) "," X { $1.add($3) }
+// 179|    non_empty_list_commas_rev(X) "," X { $1.add($3) }
 
 ///|
-fn yy_action_275(
+fn yy_action_285(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -12023,10 +12646,10 @@ fn yy_action_275(
 }
 
 // file:///./parser.mbty
-// 173|    X { @list.singleton($1) }
+// 178|    X { @list.singleton($1) }
 
 ///|
-fn yy_action_276(
+fn yy_action_286(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -12040,14 +12663,14 @@ fn yy_action_276(
 }
 
 // file:///./parser.mbty
-// 922|    UIDENT_MAYBE_DOT "as" UIDENT { 
-// 923|    let target = Label::{ name: $1, loc: mk_loc($loc($1)) }
-// 924|    let binder = Binder::{ name: $3, loc: mk_loc($loc($3)) }
-// 925|    AliasTarget::{ binder, target: Some(target) }
-// 926|  }
+// 931|    UIDENT_MAYBE_DOT "as" UIDENT { 
+// 932|    let target = Label::{ name: $1, loc: mk_loc($loc($1)) }
+// 933|    let binder = Binder::{ name: $3, loc: mk_loc($loc($3)) }
+// 934|    AliasTarget::{ binder, target: Some(target) }
+// 935|  }
 
 ///|
-fn yy_action_277(
+fn yy_action_287(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -12074,13 +12697,13 @@ fn yy_action_277(
 }
 
 // file:///./parser.mbty
-// 918|    UIDENT_MAYBE_DOT { 
-// 919|    let binder = Binder::{ name: $1, loc: mk_loc($loc($1)) }
-// 920|    AliasTarget::{ binder, target: None }
-// 921|  }
+// 927|    UIDENT_MAYBE_DOT { 
+// 928|    let binder = Binder::{ name: $1, loc: mk_loc($loc($1)) }
+// 929|    AliasTarget::{ binder, target: None }
+// 930|  }
 
 ///|
-fn yy_action_278(
+fn yy_action_288(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -12100,10 +12723,10 @@ fn yy_action_278(
 }
 
 // file:///./parser.mbty
-// 914|    batch_type_alias_target(UIDENT) { (false, None, @list.singleton($1)) }
+// 923|    batch_type_alias_target(UIDENT) { (false, None, @list.singleton($1)) }
 
 ///|
-fn yy_action_279(
+fn yy_action_289(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -12117,14 +12740,14 @@ fn yy_action_279(
 }
 
 // file:///./parser.mbty
-// 922|    UIDENT_MAYBE_DOT "as" UIDENT { 
-// 923|    let target = Label::{ name: $1, loc: mk_loc($loc($1)) }
-// 924|    let binder = Binder::{ name: $3, loc: mk_loc($loc($3)) }
-// 925|    AliasTarget::{ binder, target: Some(target) }
-// 926|  }
+// 931|    UIDENT_MAYBE_DOT "as" UIDENT { 
+// 932|    let target = Label::{ name: $1, loc: mk_loc($loc($1)) }
+// 933|    let binder = Binder::{ name: $3, loc: mk_loc($loc($3)) }
+// 934|    AliasTarget::{ binder, target: Some(target) }
+// 935|  }
 
 ///|
-fn yy_action_280(
+fn yy_action_290(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -12151,13 +12774,13 @@ fn yy_action_280(
 }
 
 // file:///./parser.mbty
-// 918|    UIDENT_MAYBE_DOT { 
-// 919|    let binder = Binder::{ name: $1, loc: mk_loc($loc($1)) }
-// 920|    AliasTarget::{ binder, target: None }
-// 921|  }
+// 927|    UIDENT_MAYBE_DOT { 
+// 928|    let binder = Binder::{ name: $1, loc: mk_loc($loc($1)) }
+// 929|    AliasTarget::{ binder, target: None }
+// 930|  }
 
 ///|
-fn yy_action_281(
+fn yy_action_291(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -12177,22 +12800,22 @@ fn yy_action_281(
 }
 
 // file:///./parser.mbty
-// 765|    attributes is_async "test" option(loced_string) option(parameters) block_expr_with_local_types {
-// 766|    let (local_types, expr) = $6
-// 767|    TopTest(
-// 768|      expr~,
-// 769|      name = $4,
-// 770|      params = $5,
-// 771|      local_types~,
-// 772|      is_async = $2,
-// 773|      loc = mk_loc($sloc),
-// 774|      attrs = $1,
-// 775|      doc = DocString::empty()
-// 776|    )
-// 777|  }
+// 774|    attributes is_async "test" option(loced_string) option(parameters) block_expr_with_local_types {
+// 775|    let (local_types, expr) = $6
+// 776|    TopTest(
+// 777|      expr~,
+// 778|      name = $4,
+// 779|      params = $5,
+// 780|      local_types~,
+// 781|      is_async = $2,
+// 782|      loc = mk_loc($sloc),
+// 783|      attrs = $1,
+// 784|      doc = DocString::empty()
+// 785|    )
+// 786|  }
 
 ///|
-fn yy_action_282(
+fn yy_action_292(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -12231,7 +12854,7 @@ fn yy_action_282(
 // 5|    X { Some($1) }
 
 ///|
-fn yy_action_283(
+fn yy_action_293(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -12248,7 +12871,7 @@ fn yy_action_283(
 // 4|    { None }
 
 ///|
-fn yy_action_284(
+fn yy_action_294(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -12264,11 +12887,11 @@ fn yy_action_284(
 // 5|    X { Some($1) }
 
 ///|
-fn yy_action_285(
+fn yy_action_295(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_286(_last_pos, _args[0:1])
+  let _sub_action_0_result = yy_action_296(_last_pos, _args[0:1])
   guard _sub_action_0_result is YYObj__StringLiteral__Location_(_dollar1)
   YYObj_Option__StringLiteral__Location__(
     {
@@ -12279,10 +12902,10 @@ fn yy_action_285(
 }
 
 // file:///./parser.mbty
-// 1889|    STRING { ($1, mk_loc($sloc)) }
+// 1923|    STRING { ($1, mk_loc($sloc)) }
 
 ///|
-fn yy_action_286(
+fn yy_action_296(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -12305,7 +12928,7 @@ fn yy_action_286(
 // 4|    { None }
 
 ///|
-fn yy_action_287(
+fn yy_action_297(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -12318,27 +12941,27 @@ fn yy_action_287(
 }
 
 // file:///./parser.mbty
-// 778|    attributes visibility "impl" optional_type_parameters type_name "for" type_ "with" binder optional_bang parameters func_return_type impl_body {
-// 779|    let (ret_ty, err_ty) = $12
-// 780|    TopImpl(
-// 781|      self_ty = Some($7),
-// 782|      trait_ = $5,
-// 783|      method_name = $9,
-// 784|      has_error = $10,
-// 785|      quantifiers = $4,
-// 786|      params = $11,
-// 787|      ret_ty~,
-// 788|      err_ty~,
-// 789|      body = $13,
-// 790|      vis = $2,
-// 791|      loc = mk_loc($sloc),
-// 792|      attrs = $1,
-// 793|      doc = DocString::empty()
-// 794|    )
-// 795|  }
+// 787|    attributes visibility "impl" optional_type_parameters type_name "for" type_ "with" binder optional_bang parameters func_return_type impl_body {
+// 788|    let (ret_ty, err_ty) = $12
+// 789|    TopImpl(
+// 790|      self_ty = Some($7),
+// 791|      trait_ = $5,
+// 792|      method_name = $9,
+// 793|      has_error = $10,
+// 794|      quantifiers = $4,
+// 795|      params = $11,
+// 796|      ret_ty~,
+// 797|      err_ty~,
+// 798|      body = $13,
+// 799|      vis = $2,
+// 800|      loc = mk_loc($sloc),
+// 801|      attrs = $1,
+// 802|      doc = DocString::empty()
+// 803|    )
+// 804|  }
 
 ///|
-fn yy_action_288(
+fn yy_action_298(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -12385,21 +13008,21 @@ fn yy_action_288(
 }
 
 // file:///./parser.mbty
-// 814|    attributes is_declare visibility "impl" optional_type_parameters type_name "for" type_ {
-// 815|    TopImplRelation(
-// 816|      self_ty = $8,
-// 817|      trait_ = $6,
-// 818|      quantifiers = $5,
-// 819|      vis = $3,
-// 820|      attrs = $1,
-// 821|      loc = mk_loc($sloc),
-// 822|      doc = DocString::empty(),
-// 823|      is_declare = $2
-// 824|    )
-// 825|  }
+// 823|    attributes is_declare visibility "impl" optional_type_parameters type_name "for" type_ {
+// 824|    TopImplRelation(
+// 825|      self_ty = $8,
+// 826|      trait_ = $6,
+// 827|      quantifiers = $5,
+// 828|      vis = $3,
+// 829|      attrs = $1,
+// 830|      loc = mk_loc($sloc),
+// 831|      doc = DocString::empty(),
+// 832|      is_declare = $2
+// 833|    )
+// 834|  }
 
 ///|
-fn yy_action_289(
+fn yy_action_299(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -12436,17 +13059,17 @@ fn yy_action_289(
 }
 
 // file:///./parser.mbty
-// 366|    "struct" UIDENT "{" list_semis(record_decl_field) "}" deriving_directive_list {
-// 367|    LocalTypeDecl::{
-// 368|      tycon : $2,
-// 369|      tycon_loc : mk_loc($loc($2)),
-// 370|      components: Record($4),
-// 371|      deriving: $6
-// 372|    }
-// 373|  }
+// 373|    "struct" UIDENT "{" list_semis(record_decl_field) "}" deriving_directive_list {
+// 374|    LocalTypeDecl::{
+// 375|      tycon : $2,
+// 376|      tycon_loc : mk_loc($loc($2)),
+// 377|      components: Record(fields = $4, constr_decl = None),
+// 378|      deriving: $6
+// 379|    }
+// 380|  }
 
 ///|
-fn yy_action_290(
+fn yy_action_300(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -12461,7 +13084,7 @@ fn yy_action_290(
       LocalTypeDecl::{
         tycon: _dollar2,
         tycon_loc: mk_loc((_start_pos_of_item1, _end_pos_of_item1)),
-        components: Record(_dollar4),
+        components: Record(fields=_dollar4, constr_decl=None),
         deriving: _dollar6,
       }
     },
@@ -12469,10 +13092,10 @@ fn yy_action_290(
 }
 
 // file:///./parser.mbty
-// 235|    non_empty_list_semis(X) { $1 }
+// 240|    non_empty_list_semis(X) { $1 }
 
 ///|
-fn yy_action_291(
+fn yy_action_301(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -12486,20 +13109,20 @@ fn yy_action_291(
 }
 
 // file:///./parser.mbty
-// 2130|    attributes visibility option("mut") LIDENT ":" type_ { 
-// 2131|    FieldDecl::{
-// 2132|      name: FieldName::{ label: $4, loc: mk_loc($loc($4)) },
-// 2133|      ty: $6,
-// 2134|      mut_: $3 is Some(_),
-// 2135|      vis: $2,
-// 2136|      loc: mk_loc($sloc),
-// 2137|      attrs: $1,
-// 2138|      doc: DocString::empty()
-// 2139|    }
-// 2140|  }
+// 2164|    attributes visibility option("mut") LIDENT ":" type_ { 
+// 2165|    FieldDecl::{
+// 2166|      name: FieldName::{ label: $4, loc: mk_loc($loc($4)) },
+// 2167|      ty: $6,
+// 2168|      mut_: $3 is Some(_),
+// 2169|      vis: $2,
+// 2170|      loc: mk_loc($sloc),
+// 2171|      attrs: $1,
+// 2172|      doc: DocString::empty()
+// 2173|    }
+// 2174|  }
 
 ///|
-fn yy_action_292(
+fn yy_action_302(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -12538,20 +13161,20 @@ fn yy_action_292(
 }
 
 // file:///./parser.mbty
-// 2130|    attributes visibility option("mut") LIDENT ":" type_ { 
-// 2131|    FieldDecl::{
-// 2132|      name: FieldName::{ label: $4, loc: mk_loc($loc($4)) },
-// 2133|      ty: $6,
-// 2134|      mut_: $3 is Some(_),
-// 2135|      vis: $2,
-// 2136|      loc: mk_loc($sloc),
-// 2137|      attrs: $1,
-// 2138|      doc: DocString::empty()
-// 2139|    }
-// 2140|  }
+// 2164|    attributes visibility option("mut") LIDENT ":" type_ { 
+// 2165|    FieldDecl::{
+// 2166|      name: FieldName::{ label: $4, loc: mk_loc($loc($4)) },
+// 2167|      ty: $6,
+// 2168|      mut_: $3 is Some(_),
+// 2169|      vis: $2,
+// 2170|      loc: mk_loc($sloc),
+// 2171|      attrs: $1,
+// 2172|      doc: DocString::empty()
+// 2173|    }
+// 2174|  }
 
 ///|
-fn yy_action_293(
+fn yy_action_303(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -12590,20 +13213,20 @@ fn yy_action_293(
 }
 
 // file:///./parser.mbty
-// 2130|    attributes visibility option("mut") LIDENT ":" type_ { 
-// 2131|    FieldDecl::{
-// 2132|      name: FieldName::{ label: $4, loc: mk_loc($loc($4)) },
-// 2133|      ty: $6,
-// 2134|      mut_: $3 is Some(_),
-// 2135|      vis: $2,
-// 2136|      loc: mk_loc($sloc),
-// 2137|      attrs: $1,
-// 2138|      doc: DocString::empty()
-// 2139|    }
-// 2140|  }
+// 2164|    attributes visibility option("mut") LIDENT ":" type_ { 
+// 2165|    FieldDecl::{
+// 2166|      name: FieldName::{ label: $4, loc: mk_loc($loc($4)) },
+// 2167|      ty: $6,
+// 2168|      mut_: $3 is Some(_),
+// 2169|      vis: $2,
+// 2170|      loc: mk_loc($sloc),
+// 2171|      attrs: $1,
+// 2172|      doc: DocString::empty()
+// 2173|    }
+// 2174|  }
 
 ///|
-fn yy_action_294(
+fn yy_action_304(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -12642,20 +13265,20 @@ fn yy_action_294(
 }
 
 // file:///./parser.mbty
-// 2130|    attributes visibility option("mut") LIDENT ":" type_ { 
-// 2131|    FieldDecl::{
-// 2132|      name: FieldName::{ label: $4, loc: mk_loc($loc($4)) },
-// 2133|      ty: $6,
-// 2134|      mut_: $3 is Some(_),
-// 2135|      vis: $2,
-// 2136|      loc: mk_loc($sloc),
-// 2137|      attrs: $1,
-// 2138|      doc: DocString::empty()
-// 2139|    }
-// 2140|  }
+// 2164|    attributes visibility option("mut") LIDENT ":" type_ { 
+// 2165|    FieldDecl::{
+// 2166|      name: FieldName::{ label: $4, loc: mk_loc($loc($4)) },
+// 2167|      ty: $6,
+// 2168|      mut_: $3 is Some(_),
+// 2169|      vis: $2,
+// 2170|      loc: mk_loc($sloc),
+// 2171|      attrs: $1,
+// 2172|      doc: DocString::empty()
+// 2173|    }
+// 2174|  }
 
 ///|
-fn yy_action_295(
+fn yy_action_305(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -12694,20 +13317,20 @@ fn yy_action_295(
 }
 
 // file:///./parser.mbty
-// 2130|    attributes visibility option("mut") LIDENT ":" type_ { 
-// 2131|    FieldDecl::{
-// 2132|      name: FieldName::{ label: $4, loc: mk_loc($loc($4)) },
-// 2133|      ty: $6,
-// 2134|      mut_: $3 is Some(_),
-// 2135|      vis: $2,
-// 2136|      loc: mk_loc($sloc),
-// 2137|      attrs: $1,
-// 2138|      doc: DocString::empty()
-// 2139|    }
-// 2140|  }
+// 2164|    attributes visibility option("mut") LIDENT ":" type_ { 
+// 2165|    FieldDecl::{
+// 2166|      name: FieldName::{ label: $4, loc: mk_loc($loc($4)) },
+// 2167|      ty: $6,
+// 2168|      mut_: $3 is Some(_),
+// 2169|      vis: $2,
+// 2170|      loc: mk_loc($sloc),
+// 2171|      attrs: $1,
+// 2172|      doc: DocString::empty()
+// 2173|    }
+// 2174|  }
 
 ///|
-fn yy_action_296(
+fn yy_action_306(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -12746,7 +13369,7 @@ fn yy_action_296(
 }
 
 // file:///./parser.mbty
-// 869|    "priv" { Priv(loc = mk_loc($sloc)) }
+// 878|    "priv" { Priv(loc = mk_loc($sloc)) }
 
 ///|
 fn yy_action_10(
@@ -12768,10 +13391,10 @@ fn yy_action_10(
 }
 
 // file:///./parser.mbty
-// 875|    "(" "readonly" ")" { Some("readonly") }
+// 884|    "(" "readonly" ")" { Some("readonly") }
 
 ///|
-fn yy_action_297(
+fn yy_action_307(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -12784,10 +13407,10 @@ fn yy_action_297(
 }
 
 // file:///./parser.mbty
-// 876|    "(" LIDENT ")" { Some($2) }
+// 885|    "(" LIDENT ")" { Some($2) }
 
 ///|
-fn yy_action_298(
+fn yy_action_308(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -12801,20 +13424,20 @@ fn yy_action_298(
 }
 
 // file:///./parser.mbty
-// 2130|    attributes visibility option("mut") LIDENT ":" type_ { 
-// 2131|    FieldDecl::{
-// 2132|      name: FieldName::{ label: $4, loc: mk_loc($loc($4)) },
-// 2133|      ty: $6,
-// 2134|      mut_: $3 is Some(_),
-// 2135|      vis: $2,
-// 2136|      loc: mk_loc($sloc),
-// 2137|      attrs: $1,
-// 2138|      doc: DocString::empty()
-// 2139|    }
-// 2140|  }
+// 2164|    attributes visibility option("mut") LIDENT ":" type_ { 
+// 2165|    FieldDecl::{
+// 2166|      name: FieldName::{ label: $4, loc: mk_loc($loc($4)) },
+// 2167|      ty: $6,
+// 2168|      mut_: $3 is Some(_),
+// 2169|      vis: $2,
+// 2170|      loc: mk_loc($sloc),
+// 2171|      attrs: $1,
+// 2172|      doc: DocString::empty()
+// 2173|    }
+// 2174|  }
 
 ///|
-fn yy_action_299(
+fn yy_action_309(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -12853,7 +13476,7 @@ fn yy_action_299(
 }
 
 // file:///./parser.mbty
-// 870|    "pub" pub_attr { Pub(loc = mk_loc($sloc), attr = $2) }
+// 879|    "pub" pub_attr { Pub(loc = mk_loc($sloc), attr = $2) }
 
 ///|
 fn yy_action_37(
@@ -12876,10 +13499,10 @@ fn yy_action_37(
 }
 
 // file:///./parser.mbty
-// 874|     { None }
+// 883|     { None }
 
 ///|
-fn yy_action_300(
+fn yy_action_310(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -12892,10 +13515,10 @@ fn yy_action_300(
 }
 
 // file:///./parser.mbty
-// 225|    X SEMI non_empty_list_semis(X) { $3.add($1) }
+// 230|    X SEMI non_empty_list_semis(X) { $3.add($1) }
 
 ///|
-fn yy_action_301(
+fn yy_action_311(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -12910,10 +13533,10 @@ fn yy_action_301(
 }
 
 // file:///./parser.mbty
-// 224|    X option(SEMI) { @list.singleton($1) }
+// 229|    X option(SEMI) { @list.singleton($1) }
 
 ///|
-fn yy_action_302(
+fn yy_action_312(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -12927,10 +13550,10 @@ fn yy_action_302(
 }
 
 // file:///./parser.mbty
-// 234|    { @list.empty() }
+// 239|    { @list.empty() }
 
 ///|
-fn yy_action_303(
+fn yy_action_313(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -12943,17 +13566,17 @@ fn yy_action_303(
 }
 
 // file:///./parser.mbty
-// 374|    "struct" UIDENT "(" non_empty_list_commas(type_) ")" deriving_directive_list {
-// 375|    LocalTypeDecl::{
-// 376|      tycon : $2,
-// 377|      tycon_loc : mk_loc($loc($2)),
-// 378|      components: TupleStruct($4),
-// 379|      deriving: $6
-// 380|    }
-// 381|  }
+// 381|    "struct" UIDENT "(" non_empty_list_commas(type_) ")" deriving_directive_list {
+// 382|    LocalTypeDecl::{
+// 383|      tycon : $2,
+// 384|      tycon_loc : mk_loc($loc($2)),
+// 385|      components: TupleStruct($4),
+// 386|      deriving: $6
+// 387|    }
+// 388|  }
 
 ///|
-fn yy_action_304(
+fn yy_action_314(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -12976,17 +13599,17 @@ fn yy_action_304(
 }
 
 // file:///./parser.mbty
-// 382|    "enum" UIDENT "{" list_semis(enum_constructor) "}" deriving_directive_list {
-// 383|    LocalTypeDecl::{
-// 384|      tycon : $2,
-// 385|      tycon_loc : mk_loc($loc($2)),
-// 386|      components: Variant($4),
-// 387|      deriving: $6
-// 388|    }
-// 389|  }
+// 389|    "enum" UIDENT "{" list_semis(enum_constructor) "}" deriving_directive_list {
+// 390|    LocalTypeDecl::{
+// 391|      tycon : $2,
+// 392|      tycon_loc : mk_loc($loc($2)),
+// 393|      components: Variant($4),
+// 394|      deriving: $6
+// 395|    }
+// 396|  }
 
 ///|
-fn yy_action_305(
+fn yy_action_315(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -13009,17 +13632,17 @@ fn yy_action_305(
 }
 
 // file:///./parser.mbty
-// 390|    "type" UIDENT type_ deriving_directive_list {
-// 391|    LocalTypeDecl::{
-// 392|      tycon : $2,
-// 393|      tycon_loc : mk_loc($loc($2)),
-// 394|      components: Newtype($3),
-// 395|      deriving: $4
-// 396|    }
-// 397|  }
+// 397|    "type" UIDENT type_ deriving_directive_list {
+// 398|    LocalTypeDecl::{
+// 399|      tycon : $2,
+// 400|      tycon_loc : mk_loc($loc($2)),
+// 401|      components: Newtype($3),
+// 402|      deriving: $4
+// 403|    }
+// 404|  }
 
 ///|
-fn yy_action_306(
+fn yy_action_316(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -13042,10 +13665,10 @@ fn yy_action_306(
 }
 
 // file:///./parser.mbty
-// 1039|    "derive" "(" list_commas(deriving_directive) ")" { $3 }
+// 1048|    "derive" "(" list_commas(deriving_directive) ")" { $3 }
 
 ///|
-fn yy_action_307(
+fn yy_action_317(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -13059,10 +13682,10 @@ fn yy_action_307(
 }
 
 // file:///./parser.mbty
-// 191|    non_empty_list_commas(X) { $1 }
+// 196|    non_empty_list_commas(X) { $1 }
 
 ///|
-fn yy_action_308(
+fn yy_action_318(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -13076,10 +13699,10 @@ fn yy_action_308(
 }
 
 // file:///./parser.mbty
-// 1034|    type_name "(" list_commas(argument) ")" { DerivingDirective::{ type_name: $1, args: $3, loc: mk_loc($sloc) } }
+// 1043|    type_name "(" list_commas(argument) ")" { DerivingDirective::{ type_name: $1, args: $3, loc: mk_loc($sloc) } }
 
 ///|
-fn yy_action_309(
+fn yy_action_319(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -13104,10 +13727,10 @@ fn yy_action_309(
 }
 
 // file:///./parser.mbty
-// 1033|    type_name { DerivingDirective::{ type_name: $1, args: @list.empty(), loc: mk_loc($sloc) } }
+// 1042|    type_name { DerivingDirective::{ type_name: $1, args: @list.empty(), loc: mk_loc($sloc) } }
 
 ///|
-fn yy_action_310(
+fn yy_action_320(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -13131,10 +13754,10 @@ fn yy_action_310(
 }
 
 // file:///./parser.mbty
-// 174|    non_empty_list_commas_rev(X) "," X { $1.add($3) }
+// 179|    non_empty_list_commas_rev(X) "," X { $1.add($3) }
 
 ///|
-fn yy_action_311(
+fn yy_action_321(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -13149,10 +13772,10 @@ fn yy_action_311(
 }
 
 // file:///./parser.mbty
-// 182|    non_empty_list_commas_rev(X) option(",") { $1.rev() }
+// 187|    non_empty_list_commas_rev(X) option(",") { $1.rev() }
 
 ///|
-fn yy_action_312(
+fn yy_action_322(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -13166,10 +13789,10 @@ fn yy_action_312(
 }
 
 // file:///./parser.mbty
-// 173|    X { @list.singleton($1) }
+// 178|    X { @list.singleton($1) }
 
 ///|
-fn yy_action_313(
+fn yy_action_323(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -13183,10 +13806,10 @@ fn yy_action_313(
 }
 
 // file:///./parser.mbty
-// 190|    { @list.empty() }
+// 195|    { @list.empty() }
 
 ///|
-fn yy_action_314(
+fn yy_action_324(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -13199,10 +13822,10 @@ fn yy_action_314(
 }
 
 // file:///./parser.mbty
-// 1038|     { @list.empty() }
+// 1047|     { @list.empty() }
 
 ///|
-fn yy_action_315(
+fn yy_action_325(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -13215,10 +13838,10 @@ fn yy_action_315(
 }
 
 // file:///./parser.mbty
-// 431|    local_type_decl SEMI local_types_and_stmts { ($3.0.add($1), $3.1) }
+// 439|    local_type_decl SEMI local_types_and_stmts { ($3.0.add($1), $3.1) }
 
 ///|
-fn yy_action_316(
+fn yy_action_326(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -13233,10 +13856,10 @@ fn yy_action_316(
 }
 
 // file:///./parser.mbty
-// 429|    local_type_decl { (@list.singleton($1), Expr::Unit(loc = mk_loc($sloc), faked = true)) }
+// 437|    local_type_decl { (@list.singleton($1), Expr::Unit(loc = mk_loc($sloc), faked = true)) }
 
 ///|
-fn yy_action_317(
+fn yy_action_327(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -13259,10 +13882,10 @@ fn yy_action_317(
 }
 
 // file:///./parser.mbty
-// 430|    list_semis_rev(statement) { (@list.empty(), Statement::compact_rev($1, loc = mk_loc($sloc))) }
+// 438|    list_semis_rev(statement) { (@list.empty(), Statement::compact_rev($1, loc = mk_loc($sloc))) }
 
 ///|
-fn yy_action_318(
+fn yy_action_328(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -13288,10 +13911,10 @@ fn yy_action_318(
 }
 
 // file:///./parser.mbty
-// 435|    "{" local_types_and_stmts "}" { $2 }
+// 443|    "{" local_types_and_stmts "}" { $2 }
 
 ///|
-fn yy_action_319(
+fn yy_action_329(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -13305,13 +13928,13 @@ fn yy_action_319(
 }
 
 // file:///./parser.mbty
-// 439|    block_expr_with_local_types {
-// 440|    let (local_types, expr) = $1
-// 441|    DeclBody(local_types~, expr~)
-// 442|  }
+// 447|    block_expr_with_local_types {
+// 448|    let (local_types, expr) = $1
+// 449|    DeclBody(local_types~, expr~)
+// 450|  }
 
 ///|
-fn yy_action_320(
+fn yy_action_330(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -13326,10 +13949,10 @@ fn yy_action_320(
 }
 
 // file:///./parser.mbty
-// 443|    "=" STRING { DeclStubs(Embedded(language = None, code = CodeString($2))) }
+// 451|    "=" STRING { DeclStubs(Embedded(language = None, code = CodeString($2))) }
 
 ///|
-fn yy_action_321(
+fn yy_action_331(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -13343,27 +13966,27 @@ fn yy_action_321(
 }
 
 // file:///./parser.mbty
-// 796|    attributes visibility "impl" optional_type_parameters type_name "with" binder optional_bang parameters func_return_type impl_body {
-// 797|    let (ret_ty, err_ty) = $10
-// 798|    TopImpl(
-// 799|      self_ty = None,
-// 800|      trait_ = $5,
-// 801|      method_name = $7,
-// 802|      has_error = $8,
-// 803|      quantifiers = $4,
-// 804|      params = $9,
-// 805|      ret_ty~,
-// 806|      err_ty~,
-// 807|      body = $11,
-// 808|      vis = $2,
-// 809|      loc = mk_loc($sloc),
-// 810|      attrs = $1,
-// 811|      doc = DocString::empty()
-// 812|    )
-// 813|  }
+// 805|    attributes visibility "impl" optional_type_parameters type_name "with" binder optional_bang parameters func_return_type impl_body {
+// 806|    let (ret_ty, err_ty) = $10
+// 807|    TopImpl(
+// 808|      self_ty = None,
+// 809|      trait_ = $5,
+// 810|      method_name = $7,
+// 811|      has_error = $8,
+// 812|      quantifiers = $4,
+// 813|      params = $9,
+// 814|      ret_ty~,
+// 815|      err_ty~,
+// 816|      body = $11,
+// 817|      vis = $2,
+// 818|      loc = mk_loc($sloc),
+// 819|      attrs = $1,
+// 820|      doc = DocString::empty()
+// 821|    )
+// 822|  }
 
 ///|
-fn yy_action_322(
+fn yy_action_332(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -13409,14 +14032,14 @@ fn yy_action_322(
 }
 
 // file:///./parser.mbty
-// 276|    delimited("[", non_empty_list_commas(id(tvar_binder)), "]") { $1 }
+// 281|    delimited("[", non_empty_list_commas(id(tvar_binder)), "]") { $1 }
 
 ///|
-fn yy_action_323(
+fn yy_action_333(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_324(_last_pos, _args[0:3])
+  let _sub_action_0_result = yy_action_334(_last_pos, _args[0:3])
   guard _sub_action_0_result is YYObj_List_TypeVarBinder_(_dollar1)
   YYObj_List_TypeVarBinder_(
     {
@@ -13430,7 +14053,7 @@ fn yy_action_323(
 // 40|    L X R { $2 }
 
 ///|
-fn yy_action_324(
+fn yy_action_334(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -13444,10 +14067,10 @@ fn yy_action_324(
 }
 
 // file:///./parser.mbty
-// 182|    non_empty_list_commas_rev(X) option(",") { $1.rev() }
+// 187|    non_empty_list_commas_rev(X) option(",") { $1.rev() }
 
 ///|
-fn yy_action_325(
+fn yy_action_335(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -13461,12 +14084,12 @@ fn yy_action_325(
 }
 
 // file:///./parser.mbty
-// 1831|    UIDENT COLON separated_nonempty_list(PLUS, tvar_constraint) { 
-// 1832|    TypeVarBinder::{ name: $1, constraints: $3, name_loc: mk_loc($loc($1)) }
-// 1833|  }
+// 1865|    UIDENT COLON separated_nonempty_list(PLUS, tvar_constraint) { 
+// 1866|    TypeVarBinder::{ name: $1, constraints: $3, name_loc: mk_loc($loc($1)) }
+// 1867|  }
 
 ///|
-fn yy_action_326(
+fn yy_action_336(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -13487,10 +14110,10 @@ fn yy_action_326(
 }
 
 // file:///./parser.mbty
-// 1842|    qual_ident_ty { TypeVarConstraint::{ trait_: $1, loc: mk_loc($sloc) } }
+// 1876|    qual_ident_ty { TypeVarConstraint::{ trait_: $1, loc: mk_loc($sloc) } }
 
 ///|
-fn yy_action_327(
+fn yy_action_337(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -13516,7 +14139,7 @@ fn yy_action_327(
 // 60|    X SEP separated_nonempty_list(SEP, X) { $3.add($1) }
 
 ///|
-fn yy_action_328(
+fn yy_action_338(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -13534,7 +14157,7 @@ fn yy_action_328(
 // 59|    X { @list.singleton($1) }
 
 ///|
-fn yy_action_329(
+fn yy_action_339(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -13548,12 +14171,12 @@ fn yy_action_329(
 }
 
 // file:///./parser.mbty
-// 1828|    UIDENT { 
-// 1829|    TypeVarBinder::{ name: $1, constraints: @list.empty(), name_loc: mk_loc($loc($1)) }
-// 1830|  }
+// 1862|    UIDENT { 
+// 1863|    TypeVarBinder::{ name: $1, constraints: @list.empty(), name_loc: mk_loc($loc($1)) }
+// 1864|  }
 
 ///|
-fn yy_action_330(
+fn yy_action_340(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -13573,14 +14196,14 @@ fn yy_action_330(
 }
 
 // file:///./parser.mbty
-// 174|    non_empty_list_commas_rev(X) "," X { $1.add($3) }
+// 179|    non_empty_list_commas_rev(X) "," X { $1.add($3) }
 
 ///|
-fn yy_action_331(
+fn yy_action_341(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_332(_args[1].2, _args[2:3])
+  let _sub_action_0_result = yy_action_342(_args[1].2, _args[2:3])
   guard _args[0].0 is YYObj_List_TypeVarBinder_(_dollar1)
   guard _sub_action_0_result is YYObj_TypeVarBinder(_dollar3)
   YYObj_List_TypeVarBinder_(
@@ -13592,14 +14215,14 @@ fn yy_action_331(
 }
 
 // file:///./parser.mbty
-// 173|    X { @list.singleton($1) }
+// 178|    X { @list.singleton($1) }
 
 ///|
-fn yy_action_333(
+fn yy_action_343(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_332(_last_pos, _args[0:1])
+  let _sub_action_0_result = yy_action_342(_last_pos, _args[0:1])
   guard _sub_action_0_result is YYObj_TypeVarBinder(_dollar1)
   YYObj_List_TypeVarBinder_(
     {
@@ -13610,10 +14233,10 @@ fn yy_action_333(
 }
 
 // file:///./parser.mbty
-// 239|    X { $1 }
+// 244|    X { $1 }
 
 ///|
-fn yy_action_332(
+fn yy_action_342(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -13627,15 +14250,15 @@ fn yy_action_332(
 }
 
 // file:///./parser.mbty
-// 285|    option(type_parameters) {
-// 286|    match $1 {
-// 287|      None => @list.empty()
-// 288|      Some(params) => params
-// 289|    }
-// 290|  }
+// 290|    option(type_parameters) {
+// 291|    match $1 {
+// 292|      None => @list.empty()
+// 293|      Some(params) => params
+// 294|    }
+// 295|  }
 
 ///|
-fn yy_action_334(
+fn yy_action_344(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -13652,26 +14275,26 @@ fn yy_action_334(
 }
 
 // file:///./parser.mbty
-// 826|    attributes visibility "enumview" optional_type_parameters UIDENT "{" list_semis(enum_constructor) "}" "for" type_ "with" binder parameters block_expr {
-// 827|    TopView(
-// 828|      quantifiers = $4,
-// 829|      source_ty = $10,
-// 830|      view_type_name = $5,
-// 831|      view_type_loc = mk_loc($loc($5)),
-// 832|      view_func_name = $12,
-// 833|      parameters = $13,
-// 834|      params_loc = mk_loc($loc($13)),
-// 835|      view_constrs = $7,
-// 836|      body = $14,
-// 837|      vis = $2,
-// 838|      loc = mk_loc($sloc),
-// 839|      attrs = $1,
-// 840|      doc = DocString::empty()
-// 841|    )
-// 842|  }
+// 835|    attributes visibility "enumview" optional_type_parameters UIDENT "{" list_semis(enum_constructor) "}" "for" type_ "with" binder parameters block_expr {
+// 836|    TopView(
+// 837|      quantifiers = $4,
+// 838|      source_ty = $10,
+// 839|      view_type_name = $5,
+// 840|      view_type_loc = mk_loc($loc($5)),
+// 841|      view_func_name = $12,
+// 842|      parameters = $13,
+// 843|      params_loc = mk_loc($loc($13)),
+// 844|      view_constrs = $7,
+// 845|      body = $14,
+// 846|      vis = $2,
+// 847|      loc = mk_loc($sloc),
+// 848|      attrs = $1,
+// 849|      doc = DocString::empty()
+// 850|    )
+// 851|  }
 
 ///|
-fn yy_action_335(
+fn yy_action_345(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -13720,10 +14343,10 @@ fn yy_action_335(
 }
 
 // file:///./parser.mbty
-// 235|    non_empty_list_semis(X) { $1 }
+// 240|    non_empty_list_semis(X) { $1 }
 
 ///|
-fn yy_action_336(
+fn yy_action_346(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -13737,19 +14360,19 @@ fn yy_action_336(
 }
 
 // file:///./parser.mbty
-// 2162|    attributes UIDENT option(delimited("(", non_empty_list_commas(constructor_param), ")")) option(eq_int_tag) { 
-// 2163|    ConstrDecl::{
-// 2164|      name: ConstrName::{ name: $2, loc: mk_loc($loc($2)) },
-// 2165|      args: $3,
-// 2166|      tag: $4,
-// 2167|      loc: mk_loc($sloc),
-// 2168|      attrs: $1,
-// 2169|      doc: DocString::empty()
-// 2170|    }
-// 2171|  }
+// 2230|    attributes UIDENT option(delimited("(", non_empty_list_commas(constructor_param), ")")) option(eq_int_tag) { 
+// 2231|    ConstrDecl::{
+// 2232|      name: ConstrName::{ name: $2, loc: mk_loc($loc($2)) },
+// 2233|      args: $3,
+// 2234|      tag: $4,
+// 2235|      loc: mk_loc($sloc),
+// 2236|      attrs: $1,
+// 2237|      doc: DocString::empty()
+// 2238|    }
+// 2239|  }
 
 ///|
-fn yy_action_337(
+fn yy_action_347(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -13785,19 +14408,19 @@ fn yy_action_337(
 }
 
 // file:///./parser.mbty
-// 2162|    attributes UIDENT option(delimited("(", non_empty_list_commas(constructor_param), ")")) option(eq_int_tag) { 
-// 2163|    ConstrDecl::{
-// 2164|      name: ConstrName::{ name: $2, loc: mk_loc($loc($2)) },
-// 2165|      args: $3,
-// 2166|      tag: $4,
-// 2167|      loc: mk_loc($sloc),
-// 2168|      attrs: $1,
-// 2169|      doc: DocString::empty()
-// 2170|    }
-// 2171|  }
+// 2230|    attributes UIDENT option(delimited("(", non_empty_list_commas(constructor_param), ")")) option(eq_int_tag) { 
+// 2231|    ConstrDecl::{
+// 2232|      name: ConstrName::{ name: $2, loc: mk_loc($loc($2)) },
+// 2233|      args: $3,
+// 2234|      tag: $4,
+// 2235|      loc: mk_loc($sloc),
+// 2236|      attrs: $1,
+// 2237|      doc: DocString::empty()
+// 2238|    }
+// 2239|  }
 
 ///|
-fn yy_action_338(
+fn yy_action_348(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -13833,7 +14456,7 @@ fn yy_action_338(
 }
 
 // file:///./parser.mbty
-// 860|    non_empty_list(attribute) { $1 }
+// 869|    non_empty_list(attribute) { $1 }
 
 ///|
 fn yy_action_60(
@@ -13853,11 +14476,11 @@ fn yy_action_60(
 // 5|    X { Some($1) }
 
 ///|
-fn yy_action_339(
+fn yy_action_349(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_340(_last_pos, _args[0:2])
+  let _sub_action_0_result = yy_action_350(_last_pos, _args[0:2])
   guard _sub_action_0_result is YYObj__String__Location_(_dollar1)
   YYObj_Option__String__Location__(
     {
@@ -13868,10 +14491,10 @@ fn yy_action_339(
 }
 
 // file:///./parser.mbty
-// 2175|    "=" INT { ($2, mk_loc($loc($2))) }
+// 2243|    "=" INT { ($2, mk_loc($loc($2))) }
 
 ///|
-fn yy_action_340(
+fn yy_action_350(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -13890,7 +14513,7 @@ fn yy_action_340(
 // 4|    { None }
 
 ///|
-fn yy_action_341(
+fn yy_action_351(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -13903,16 +14526,16 @@ fn yy_action_341(
 }
 
 // file:///./parser.mbty
-// 2144|    option("mut") type_ { 
-// 2145|    ConstrParam::{
-// 2146|      ty: $2,
-// 2147|      mut_: $1 is Some(_),
-// 2148|      label: None
-// 2149|    }
-// 2150|  }
+// 2212|    option("mut") type_ { 
+// 2213|    ConstrParam::{
+// 2214|      ty: $2,
+// 2215|      mut_: $1 is Some(_),
+// 2216|      label: None
+// 2217|    }
+// 2218|  }
 
 ///|
-fn yy_action_342(
+fn yy_action_352(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -13927,17 +14550,17 @@ fn yy_action_342(
 }
 
 // file:///./parser.mbty
-// 2151|    option("mut") POST_LABEL ":" type_ { 
-// 2152|    let label = Label::{ name: $2, loc: mk_loc($loc($2)).trim_last_char() }
-// 2153|    ConstrParam::{
-// 2154|      ty: $4,
-// 2155|      mut_: $1 is Some(_),
-// 2156|      label: Some(label)
-// 2157|    }
-// 2158|  }
+// 2219|    option("mut") POST_LABEL ":" type_ { 
+// 2220|    let label = Label::{ name: $2, loc: mk_loc($loc($2)).trim_last_char() }
+// 2221|    ConstrParam::{
+// 2222|      ty: $4,
+// 2223|      mut_: $1 is Some(_),
+// 2224|      label: Some(label)
+// 2225|    }
+// 2226|  }
 
 ///|
-fn yy_action_343(
+fn yy_action_353(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -13966,7 +14589,7 @@ fn yy_action_343(
 // 5|    X { Some($1) }
 
 ///|
-fn yy_action_344(
+fn yy_action_354(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -13980,10 +14603,10 @@ fn yy_action_344(
 }
 
 // file:///./parser.mbty
-// 174|    non_empty_list_commas_rev(X) "," X { $1.add($3) }
+// 179|    non_empty_list_commas_rev(X) "," X { $1.add($3) }
 
 ///|
-fn yy_action_345(
+fn yy_action_355(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -13998,10 +14621,10 @@ fn yy_action_345(
 }
 
 // file:///./parser.mbty
-// 182|    non_empty_list_commas_rev(X) option(",") { $1.rev() }
+// 187|    non_empty_list_commas_rev(X) option(",") { $1.rev() }
 
 ///|
-fn yy_action_346(
+fn yy_action_356(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -14018,11 +14641,11 @@ fn yy_action_346(
 // 5|    X { Some($1) }
 
 ///|
-fn yy_action_347(
+fn yy_action_357(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_348(_last_pos, _args[0:3])
+  let _sub_action_0_result = yy_action_358(_last_pos, _args[0:3])
   guard _sub_action_0_result is YYObj_List_ConstrParam_(_dollar1)
   YYObj_Option_List_ConstrParam__(
     {
@@ -14036,7 +14659,7 @@ fn yy_action_347(
 // 40|    L X R { $2 }
 
 ///|
-fn yy_action_348(
+fn yy_action_358(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -14050,10 +14673,10 @@ fn yy_action_348(
 }
 
 // file:///./parser.mbty
-// 173|    X { @list.singleton($1) }
+// 178|    X { @list.singleton($1) }
 
 ///|
-fn yy_action_349(
+fn yy_action_359(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -14070,7 +14693,7 @@ fn yy_action_349(
 // 4|    { None }
 
 ///|
-fn yy_action_350(
+fn yy_action_360(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -14086,7 +14709,7 @@ fn yy_action_350(
 // 4|    { None }
 
 ///|
-fn yy_action_351(
+fn yy_action_361(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -14099,10 +14722,10 @@ fn yy_action_351(
 }
 
 // file:///./parser.mbty
-// 225|    X SEMI non_empty_list_semis(X) { $3.add($1) }
+// 230|    X SEMI non_empty_list_semis(X) { $3.add($1) }
 
 ///|
-fn yy_action_352(
+fn yy_action_362(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -14117,10 +14740,10 @@ fn yy_action_352(
 }
 
 // file:///./parser.mbty
-// 224|    X option(SEMI) { @list.singleton($1) }
+// 229|    X option(SEMI) { @list.singleton($1) }
 
 ///|
-fn yy_action_353(
+fn yy_action_363(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -14134,10 +14757,10 @@ fn yy_action_353(
 }
 
 // file:///./parser.mbty
-// 234|    { @list.empty() }
+// 239|    { @list.empty() }
 
 ///|
-fn yy_action_354(
+fn yy_action_364(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -14153,7 +14776,7 @@ fn yy_action_354(
 // 5|    X { Some($1) }
 
 ///|
-fn yy_action_355(
+fn yy_action_365(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -14170,7 +14793,7 @@ fn yy_action_355(
 // 4|    { None }
 
 ///|
-fn yy_action_356(
+fn yy_action_366(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -14183,22 +14806,22 @@ fn yy_action_356(
 }
 
 // file:///./parser.mbty
-// 843|    attributes visibility "using" PACKAGE_NAME "{" list_commas(using_binder) "}" {
-// 844|    TopUsing(
-// 845|      pkg = {
-// 846|        name : $4,
-// 847|        loc : mk_loc($loc($4))
-// 848|      },
-// 849|      names = $6,
-// 850|      vis = $2,
-// 851|      attrs = $1,
-// 852|      loc = mk_loc($loc),
-// 853|      doc = DocString::empty()
-// 854|    )
-// 855|  }
+// 852|    attributes visibility "using" PACKAGE_NAME "{" list_commas(using_binder) "}" {
+// 853|    TopUsing(
+// 854|      pkg = {
+// 855|        name : $4,
+// 856|        loc : mk_loc($loc($4))
+// 857|      },
+// 858|      names = $6,
+// 859|      vis = $2,
+// 860|      attrs = $1,
+// 861|      loc = mk_loc($loc),
+// 862|      doc = DocString::empty()
+// 863|    )
+// 864|  }
 
 ///|
-fn yy_action_357(
+fn yy_action_367(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -14235,10 +14858,10 @@ fn yy_action_357(
 }
 
 // file:///./parser.mbty
-// 191|    non_empty_list_commas(X) { $1 }
+// 196|    non_empty_list_commas(X) { $1 }
 
 ///|
-fn yy_action_358(
+fn yy_action_368(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -14252,21 +14875,21 @@ fn yy_action_358(
 }
 
 // file:///./parser.mbty
-// 983|    LIDENT "as" LIDENT
-// 984|  | UIDENT "as" UIDENT {
-// 985|    let binder = Binder::{
-// 986|      name : $3,
-// 987|      loc : mk_loc($loc($3))
-// 988|    }
-// 989|    let target = Label::{
-// 990|      name : $1,
-// 991|      loc : mk_loc($loc($1))
-// 992|    }
-// 993|    ({ binder, target : Some(target) }, UsingKind::Value)
-// 994|  }
+//  992|    LIDENT "as" LIDENT
+//  993|  | UIDENT "as" UIDENT {
+//  994|    let binder = Binder::{
+//  995|      name : $3,
+//  996|      loc : mk_loc($loc($3))
+//  997|    }
+//  998|    let target = Label::{
+//  999|      name : $1,
+// 1000|      loc : mk_loc($loc($1))
+// 1001|    }
+// 1002|    ({ binder, target : Some(target) }, UsingKind::Value)
+// 1003|  }
 
 ///|
-fn yy_action_359(
+fn yy_action_369(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -14293,17 +14916,17 @@ fn yy_action_359(
 }
 
 // file:///./parser.mbty
-// 975|    LIDENT
-// 976|  | UIDENT {
-// 977|    let binder = Binder::{
-// 978|      name : $1,
-// 979|      loc : mk_loc($loc)
-// 980|    }
-// 981|    ({ binder, target : None }, UsingKind::Value)
-// 982|  }
+// 984|    LIDENT
+// 985|  | UIDENT {
+// 986|    let binder = Binder::{
+// 987|      name : $1,
+// 988|      loc : mk_loc($loc)
+// 989|    }
+// 990|    ({ binder, target : None }, UsingKind::Value)
+// 991|  }
 
 ///|
-fn yy_action_360(
+fn yy_action_370(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -14327,20 +14950,20 @@ fn yy_action_360(
 }
 
 // file:///./parser.mbty
-// 984|    UIDENT "as" UIDENT {
-// 985|    let binder = Binder::{
-// 986|      name : $3,
-// 987|      loc : mk_loc($loc($3))
-// 988|    }
-// 989|    let target = Label::{
-// 990|      name : $1,
-// 991|      loc : mk_loc($loc($1))
-// 992|    }
-// 993|    ({ binder, target : Some(target) }, UsingKind::Value)
-// 994|  }
+//  993|    UIDENT "as" UIDENT {
+//  994|    let binder = Binder::{
+//  995|      name : $3,
+//  996|      loc : mk_loc($loc($3))
+//  997|    }
+//  998|    let target = Label::{
+//  999|      name : $1,
+// 1000|      loc : mk_loc($loc($1))
+// 1001|    }
+// 1002|    ({ binder, target : Some(target) }, UsingKind::Value)
+// 1003|  }
 
 ///|
-fn yy_action_361(
+fn yy_action_371(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -14367,16 +14990,16 @@ fn yy_action_361(
 }
 
 // file:///./parser.mbty
-// 976|    UIDENT {
-// 977|    let binder = Binder::{
-// 978|      name : $1,
-// 979|      loc : mk_loc($loc)
-// 980|    }
-// 981|    ({ binder, target : None }, UsingKind::Value)
-// 982|  }
+// 985|    UIDENT {
+// 986|    let binder = Binder::{
+// 987|      name : $1,
+// 988|      loc : mk_loc($loc)
+// 989|    }
+// 990|    ({ binder, target : None }, UsingKind::Value)
+// 991|  }
 
 ///|
-fn yy_action_362(
+fn yy_action_372(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -14400,20 +15023,20 @@ fn yy_action_362(
 }
 
 // file:///./parser.mbty
-// 1002|    "type" UIDENT "as" UIDENT {
-// 1003|    let binder = Binder::{
-// 1004|      name : $4,
-// 1005|      loc : mk_loc($loc($4))
-// 1006|    }
-// 1007|    let target = Label::{
-// 1008|      name : $2,
-// 1009|      loc : mk_loc($loc($2))
-// 1010|    }
-// 1011|    ({ binder, target : Some(target) }, UsingKind::Type)
-// 1012|  }
+// 1011|    "type" UIDENT "as" UIDENT {
+// 1012|    let binder = Binder::{
+// 1013|      name : $4,
+// 1014|      loc : mk_loc($loc($4))
+// 1015|    }
+// 1016|    let target = Label::{
+// 1017|      name : $2,
+// 1018|      loc : mk_loc($loc($2))
+// 1019|    }
+// 1020|    ({ binder, target : Some(target) }, UsingKind::Type)
+// 1021|  }
 
 ///|
-fn yy_action_363(
+fn yy_action_373(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -14440,16 +15063,16 @@ fn yy_action_363(
 }
 
 // file:///./parser.mbty
-//  995|    "type" UIDENT {
-//  996|    let binder = Binder::{
-//  997|      name : $2,
-//  998|      loc : mk_loc($loc($2))
-//  999|    }
-// 1000|    ({ binder, target : None }, UsingKind::Type)
-// 1001|  }
+// 1004|    "type" UIDENT {
+// 1005|    let binder = Binder::{
+// 1006|      name : $2,
+// 1007|      loc : mk_loc($loc($2))
+// 1008|    }
+// 1009|    ({ binder, target : None }, UsingKind::Type)
+// 1010|  }
 
 ///|
-fn yy_action_364(
+fn yy_action_374(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -14469,20 +15092,20 @@ fn yy_action_364(
 }
 
 // file:///./parser.mbty
-// 1020|    "trait" UIDENT "as" UIDENT {
-// 1021|    let binder = Binder::{
-// 1022|      name : $4,
-// 1023|      loc : mk_loc($loc($4))
-// 1024|    }
-// 1025|    let target = Label::{
-// 1026|      name : $2,
-// 1027|      loc : mk_loc($loc($2))
-// 1028|    }
-// 1029|    ({ binder, target : Some(target) }, UsingKind::Trait)
-// 1030|  }
+// 1029|    "trait" UIDENT "as" UIDENT {
+// 1030|    let binder = Binder::{
+// 1031|      name : $4,
+// 1032|      loc : mk_loc($loc($4))
+// 1033|    }
+// 1034|    let target = Label::{
+// 1035|      name : $2,
+// 1036|      loc : mk_loc($loc($2))
+// 1037|    }
+// 1038|    ({ binder, target : Some(target) }, UsingKind::Trait)
+// 1039|  }
 
 ///|
-fn yy_action_365(
+fn yy_action_375(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -14509,16 +15132,16 @@ fn yy_action_365(
 }
 
 // file:///./parser.mbty
-// 1013|    "trait" UIDENT {
-// 1014|    let binder = Binder::{
-// 1015|      name : $2,
-// 1016|      loc : mk_loc($loc($2))
-// 1017|    }
-// 1018|    ({ binder, target : None }, UsingKind::Trait)
-// 1019|  }
+// 1022|    "trait" UIDENT {
+// 1023|    let binder = Binder::{
+// 1024|      name : $2,
+// 1025|      loc : mk_loc($loc($2))
+// 1026|    }
+// 1027|    ({ binder, target : None }, UsingKind::Trait)
+// 1028|  }
 
 ///|
-fn yy_action_366(
+fn yy_action_376(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -14538,10 +15161,10 @@ fn yy_action_366(
 }
 
 // file:///./parser.mbty
-// 174|    non_empty_list_commas_rev(X) "," X { $1.add($3) }
+// 179|    non_empty_list_commas_rev(X) "," X { $1.add($3) }
 
 ///|
-fn yy_action_367(
+fn yy_action_377(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -14556,10 +15179,10 @@ fn yy_action_367(
 }
 
 // file:///./parser.mbty
-// 182|    non_empty_list_commas_rev(X) option(",") { $1.rev() }
+// 187|    non_empty_list_commas_rev(X) option(",") { $1.rev() }
 
 ///|
-fn yy_action_368(
+fn yy_action_378(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -14573,10 +15196,10 @@ fn yy_action_368(
 }
 
 // file:///./parser.mbty
-// 173|    X { @list.singleton($1) }
+// 178|    X { @list.singleton($1) }
 
 ///|
-fn yy_action_369(
+fn yy_action_379(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -14590,10 +15213,10 @@ fn yy_action_369(
 }
 
 // file:///./parser.mbty
-// 190|    { @list.empty() }
+// 195|    { @list.empty() }
 
 ///|
-fn yy_action_370(
+fn yy_action_380(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -14606,12 +15229,12 @@ fn yy_action_370(
 }
 
 // file:///./parser.mbty
-// 884|    attributes is_declare visibility "type" UIDENT optional_type_parameters_no_constraints { 
-// 885|    ($1, $3, $2, $5, mk_loc($loc($5)), $6) 
-// 886|  }
+// 893|    attributes is_declare visibility "type" UIDENT optional_type_parameters_no_constraints { 
+// 894|    ($1, $3, $2, $5, mk_loc($loc($5)), $6) 
+// 895|  }
 
 ///|
-fn yy_action_371(
+fn yy_action_381(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -14641,10 +15264,10 @@ fn yy_action_371(
 }
 
 // file:///./parser.mbty
-// 890|    attributes is_declare visibility "suberror" UIDENT { ($1, $3, $2, $5, mk_loc($loc($5))) }
+// 899|    attributes is_declare visibility "suberror" UIDENT { ($1, $3, $2, $5, mk_loc($loc($5))) }
 
 ///|
-fn yy_action_372(
+fn yy_action_382(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -14672,7 +15295,7 @@ fn yy_action_372(
 }
 
 // file:///./parser.mbty
-// 881|    { false }
+// 890|    { false }
 
 ///|
 fn yy_action_15(
@@ -14688,12 +15311,12 @@ fn yy_action_15(
 }
 
 // file:///./parser.mbty
-// 894|    attributes visibility "struct" UIDENT optional_type_parameters_no_constraints { 
-// 895|    ($1, $2, $4, mk_loc($loc($4)), $5) 
-// 896|  }
+// 903|    attributes visibility "struct" UIDENT optional_type_parameters_no_constraints { 
+// 904|    ($1, $2, $4, mk_loc($loc($4)), $5) 
+// 905|  }
 
 ///|
-fn yy_action_373(
+fn yy_action_383(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -14720,15 +15343,15 @@ fn yy_action_373(
 }
 
 // file:///./parser.mbty
-// 294|    option(delimited("[", non_empty_list_commas(id(type_decl_binder)), "]")) {
-// 295|    match $1 {
-// 296|      None => @list.empty()
-// 297|      Some(params) => params
-// 298|    }
-// 299|  }
+// 299|    option(delimited("[", non_empty_list_commas(id(type_decl_binder)), "]")) {
+// 300|    match $1 {
+// 301|      None => @list.empty()
+// 302|      Some(params) => params
+// 303|    }
+// 304|  }
 
 ///|
-fn yy_action_374(
+fn yy_action_384(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -14745,12 +15368,12 @@ fn yy_action_374(
 }
 
 // file:///./parser.mbty
-// 900|    attributes visibility "enum" UIDENT optional_type_parameters_no_constraints { 
-// 901|    ($1, $2, $4, mk_loc($loc($4)), $5) 
-// 902|  }
+// 909|    attributes visibility "enum" UIDENT optional_type_parameters_no_constraints { 
+// 910|    ($1, $2, $4, mk_loc($loc($4)), $5) 
+// 911|  }
 
 ///|
-fn yy_action_375(
+fn yy_action_385(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -14777,7 +15400,7 @@ fn yy_action_375(
 }
 
 // file:///./parser.mbty
-// 868|     { Default }
+// 877|     { Default }
 
 ///|
 fn yy_action_4(
@@ -14793,7 +15416,7 @@ fn yy_action_4(
 }
 
 // file:///./parser.mbty
-// 859|     { @list.empty() }
+// 868|     { @list.empty() }
 
 ///|
 fn yy_action_3(
@@ -14809,10 +15432,10 @@ fn yy_action_3(
 }
 
 // file:///./parser.mbty
-// 182|    non_empty_list_commas_rev(X) option(",") { $1.rev() }
+// 187|    non_empty_list_commas_rev(X) option(",") { $1.rev() }
 
 ///|
-fn yy_action_376(
+fn yy_action_386(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -14826,10 +15449,10 @@ fn yy_action_376(
 }
 
 // file:///./parser.mbty
-// 1837|    UIDENT { TypeDeclBinder::{ name: Some($1), loc: mk_loc($sloc) } }
+// 1871|    UIDENT { TypeDeclBinder::{ name: Some($1), loc: mk_loc($sloc) } }
 
 ///|
-fn yy_action_377(
+fn yy_action_387(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -14852,10 +15475,10 @@ fn yy_action_377(
 }
 
 // file:///./parser.mbty
-// 1838|    "_" { TypeDeclBinder::{ name: None, loc: mk_loc($sloc) } }
+// 1872|    "_" { TypeDeclBinder::{ name: None, loc: mk_loc($sloc) } }
 
 ///|
-fn yy_action_378(
+fn yy_action_388(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -14874,14 +15497,14 @@ fn yy_action_378(
 }
 
 // file:///./parser.mbty
-// 174|    non_empty_list_commas_rev(X) "," X { $1.add($3) }
+// 179|    non_empty_list_commas_rev(X) "," X { $1.add($3) }
 
 ///|
-fn yy_action_379(
+fn yy_action_389(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_380(_args[1].2, _args[2:3])
+  let _sub_action_0_result = yy_action_390(_args[1].2, _args[2:3])
   guard _args[0].0 is YYObj_List_TypeDeclBinder_(_dollar1)
   guard _sub_action_0_result is YYObj_TypeDeclBinder(_dollar3)
   YYObj_List_TypeDeclBinder_(
@@ -14896,11 +15519,11 @@ fn yy_action_379(
 // 5|    X { Some($1) }
 
 ///|
-fn yy_action_381(
+fn yy_action_391(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_382(_last_pos, _args[0:3])
+  let _sub_action_0_result = yy_action_392(_last_pos, _args[0:3])
   guard _sub_action_0_result is YYObj_List_TypeDeclBinder_(_dollar1)
   YYObj_Option_List_TypeDeclBinder__(
     {
@@ -14914,7 +15537,7 @@ fn yy_action_381(
 // 40|    L X R { $2 }
 
 ///|
-fn yy_action_382(
+fn yy_action_392(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -14928,14 +15551,14 @@ fn yy_action_382(
 }
 
 // file:///./parser.mbty
-// 173|    X { @list.singleton($1) }
+// 178|    X { @list.singleton($1) }
 
 ///|
-fn yy_action_383(
+fn yy_action_393(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_380(_last_pos, _args[0:1])
+  let _sub_action_0_result = yy_action_390(_last_pos, _args[0:1])
   guard _sub_action_0_result is YYObj_TypeDeclBinder(_dollar1)
   YYObj_List_TypeDeclBinder_(
     {
@@ -14946,10 +15569,10 @@ fn yy_action_383(
 }
 
 // file:///./parser.mbty
-// 239|    X { $1 }
+// 244|    X { $1 }
 
 ///|
-fn yy_action_380(
+fn yy_action_390(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -14966,7 +15589,7 @@ fn yy_action_380(
 // 4|    { None }
 
 ///|
-fn yy_action_384(
+fn yy_action_394(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -14979,14 +15602,14 @@ fn yy_action_384(
 }
 
 // file:///./parser.mbty
-// 169|    X non_empty_list(X) { $2.add($1) }
+// 174|    X non_empty_list(X) { $2.add($1) }
 
 ///|
-fn yy_action_385(
+fn yy_action_395(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_386(_last_pos, _args[0:1])
+  let _sub_action_0_result = yy_action_396(_last_pos, _args[0:1])
   guard _args[1].0 is YYObj_List_Attribute_(_dollar2)
   guard _sub_action_0_result is YYObj_Attribute(_dollar1)
   YYObj_List_Attribute_(
@@ -14998,14 +15621,14 @@ fn yy_action_385(
 }
 
 // file:///./parser.mbty
-// 168|    X { @list.singleton($1) }
+// 173|    X { @list.singleton($1) }
 
 ///|
-fn yy_action_387(
+fn yy_action_397(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_386(_last_pos, _args[0:1])
+  let _sub_action_0_result = yy_action_396(_last_pos, _args[0:1])
   guard _sub_action_0_result is YYObj_Attribute(_dollar1)
   YYObj_List_Attribute_(
     {
@@ -15016,10 +15639,10 @@ fn yy_action_387(
 }
 
 // file:///./parser.mbty
-// 864|    ATTRIBUTE { Attribute::new(loc=mk_loc($sloc), $1) }
+// 873|    ATTRIBUTE { Attribute::new(loc=mk_loc($sloc), $1) }
 
 ///|
-fn yy_action_386(
+fn yy_action_396(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -15039,10 +15662,10 @@ fn yy_action_386(
 }
 
 // file:///./parser.mbty
-// 225|    X SEMI non_empty_list_semis(X) { $3.add($1) }
+// 230|    X SEMI non_empty_list_semis(X) { $3.add($1) }
 
 ///|
-fn yy_action_388(
+fn yy_action_398(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -15057,10 +15680,10 @@ fn yy_action_388(
 }
 
 // file:///./parser.mbty
-// 224|    X option(SEMI) { @list.singleton($1) }
+// 229|    X option(SEMI) { @list.singleton($1) }
 
 ///|
-fn yy_action_389(
+fn yy_action_399(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -15074,10 +15697,10 @@ fn yy_action_389(
 }
 
 // file:///./parser.mbty
-// 234|    { @list.empty() }
+// 239|    { @list.empty() }
 
 ///|
-fn yy_action_390(
+fn yy_action_400(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -15090,10 +15713,10 @@ fn yy_action_390(
 }
 
 // file:///./parser.mbty
-// 447|    expr EOF { $1 }
+// 455|    expr EOF { $1 }
 
 ///|
-fn yy_action_391(
+fn yy_action_401(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -15107,10 +15730,10 @@ fn yy_action_391(
 }
 
 // file:///./parser.mbty
-// 1804|    "[" list_commas(spreadable_elem) "]" { @syntax.make_array_expr(loc = mk_loc($sloc), $2) }
+// 1838|    "[" list_commas(spreadable_elem) "]" { @syntax.make_array_expr(loc = mk_loc($sloc), $2) }
 
 ///|
-fn yy_action_392(
+fn yy_action_402(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -15133,10 +15756,10 @@ fn yy_action_392(
 }
 
 // file:///./parser.mbty
-// 191|    non_empty_list_commas(X) { $1 }
+// 196|    non_empty_list_commas(X) { $1 }
 
 ///|
-fn yy_action_393(
+fn yy_action_403(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -15150,10 +15773,10 @@ fn yy_action_393(
 }
 
 // file:///./parser.mbty
-// 1943|    expr { Regular($1) }
+// 1977|    expr { Regular($1) }
 
 ///|
-fn yy_action_394(
+fn yy_action_404(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -15167,18 +15790,18 @@ fn yy_action_394(
 }
 
 // file:///./parser.mbty
-// 2179|    label_pun "," list_commas_with_trailing_info(record_defn_single) { 
-// 2180|    let (fs, trailing) = $3
-// 2181|    let trailing_mark = if fs.is_empty() || trailing { TrailingMark::Comma } else { TrailingMark::None }
-// 2182|    (fs.add($1), trailing_mark)
-// 2183|  }
+// 2247|    label_pun "," list_commas_with_trailing_info(record_defn_single) { 
+// 2248|    let (fs, trailing) = $3
+// 2249|    let trailing_mark = if fs.is_empty() || trailing { TrailingMark::Comma } else { TrailingMark::None }
+// 2250|    (fs.add($1), trailing_mark)
+// 2251|  }
 
 ///|
-fn yy_action_395(
+fn yy_action_405(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_396(_last_pos, _args[0:1])
+  let _sub_action_0_result = yy_action_406(_last_pos, _args[0:1])
   guard _args[2].0 is YYObj__List_FieldDef___Bool_(_dollar3)
   guard _sub_action_0_result is YYObj_FieldDef(_dollar1)
   YYObj__List_FieldDef___TrailingMark_(
@@ -15196,17 +15819,17 @@ fn yy_action_395(
 }
 
 // file:///./parser.mbty
-// 2184|    labeled_expr option(",") { 
-// 2185|    let trailing_mark = if $2 is Some(_) { TrailingMark::Comma } else { TrailingMark::None }
-// 2186|    (@list.singleton($1), trailing_mark)
-// 2187|  }
+// 2252|    labeled_expr option(",") { 
+// 2253|    let trailing_mark = if $2 is Some(_) { TrailingMark::Comma } else { TrailingMark::None }
+// 2254|    (@list.singleton($1), trailing_mark)
+// 2255|  }
 
 ///|
-fn yy_action_397(
+fn yy_action_407(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_398(_last_pos, _args[0:3])
+  let _sub_action_0_result = yy_action_408(_last_pos, _args[0:3])
   guard _args[3].0 is YYObj_Option_Unit_(_dollar2)
   guard _sub_action_0_result is YYObj_FieldDef(_dollar1)
   YYObj__List_FieldDef___TrailingMark_(
@@ -15223,18 +15846,18 @@ fn yy_action_397(
 }
 
 // file:///./parser.mbty
-// 2188|    labeled_expr "," non_empty_list_commas_with_trailing_info(record_defn_single) { 
-// 2189|    let (fs, trailing) = $3
-// 2190|    let trailing_mark = if trailing { TrailingMark::Comma } else { TrailingMark::None }
-// 2191|    (fs.add($1), trailing_mark)
-// 2192|  }
+// 2256|    labeled_expr "," non_empty_list_commas_with_trailing_info(record_defn_single) { 
+// 2257|    let (fs, trailing) = $3
+// 2258|    let trailing_mark = if trailing { TrailingMark::Comma } else { TrailingMark::None }
+// 2259|    (fs.add($1), trailing_mark)
+// 2260|  }
 
 ///|
-fn yy_action_399(
+fn yy_action_409(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_398(_last_pos, _args[0:3])
+  let _sub_action_0_result = yy_action_408(_last_pos, _args[0:3])
   guard _args[4].0 is YYObj__List_FieldDef___Bool_(_dollar3)
   guard _sub_action_0_result is YYObj_FieldDef(_dollar1)
   YYObj__List_FieldDef___TrailingMark_(
@@ -15252,13 +15875,13 @@ fn yy_action_399(
 }
 
 // file:///./parser.mbty
-// 1718|    "{" record_defn "}" { 
-// 1719|    let (fs, trailing) = $2
-// 1720|    @syntax.make_record_expr(loc = mk_loc($sloc), trailing~, None, fs)
-// 1721|  }
+// 1752|    "{" record_defn "}" { 
+// 1753|    let (fs, trailing) = $2
+// 1754|    @syntax.make_record_expr(loc = mk_loc($sloc), trailing~, None, fs)
+// 1755|  }
 
 ///|
-fn yy_action_400(
+fn yy_action_410(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -15284,16 +15907,16 @@ fn yy_action_400(
 }
 
 // file:///./parser.mbty
-// 1727|    ioption(terminated(type_name, COLONCOLON)) "{" ".." expr "}" { 
-// 1728|    RecordUpdate(type_name = $1, record = $4, fields = @list.empty(), loc = mk_loc($sloc))
-// 1729|  }
+// 1761|    ioption(terminated(type_name, COLONCOLON)) "{" ".." expr "}" { 
+// 1762|    RecordUpdate(type_name = $1, record = $4, fields = @list.empty(), loc = mk_loc($sloc))
+// 1763|  }
 
 ///|
-fn yy_action_401(
+fn yy_action_411(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_402(_last_pos, _args[0:0])
+  let _sub_action_0_result = yy_action_412(_last_pos, _args[0:0])
   guard _sub_action_0_result is YYObj_Option_TypeName_(_dollar1)
   guard _args[2].0 is YYObj_Expr(_dollar4)
   let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
@@ -15316,16 +15939,16 @@ fn yy_action_401(
 }
 
 // file:///./parser.mbty
-// 1730|    ioption(terminated(type_name, COLONCOLON)) "{" ".." expr "," list_commas(record_defn_single) "}" { 
-// 1731|    RecordUpdate(type_name = $1, record = $4, fields = $6, loc = mk_loc($sloc))
-// 1732|  }
+// 1764|    ioption(terminated(type_name, COLONCOLON)) "{" ".." expr "," list_commas(record_defn_single) "}" { 
+// 1765|    RecordUpdate(type_name = $1, record = $4, fields = $6, loc = mk_loc($sloc))
+// 1766|  }
 
 ///|
-fn yy_action_403(
+fn yy_action_413(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_402(_last_pos, _args[0:0])
+  let _sub_action_0_result = yy_action_412(_last_pos, _args[0:0])
   guard _sub_action_0_result is YYObj_Option_TypeName_(_dollar1)
   guard _args[2].0 is YYObj_Expr(_dollar4)
   guard _args[4].0 is YYObj_List_FieldDef_(_dollar6)
@@ -15352,7 +15975,7 @@ fn yy_action_403(
 // 9|    { None }
 
 ///|
-fn yy_action_402(
+fn yy_action_412(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -15365,25 +15988,25 @@ fn yy_action_402(
 }
 
 // file:///./parser.mbty
-// 1733|    "{" semi_expr_semi_opt "}" { 
-// 1734|    let (expr, trailing) = $2
-// 1735|    match expr {
-// 1736|      Ident(id = { name: Ident(name~), loc }, ..) => {
-// 1737|        let label = Label::{ name, loc }
-// 1738|        let field = @syntax.make_field_def(loc = mk_loc($sloc), label, expr, true)
-// 1739|        let trailing_mark = if trailing { TrailingMark::Semi } else { TrailingMark::None }
-// 1740|        @syntax.make_record_expr(loc = mk_loc($sloc), trailing = trailing_mark, None, @list.singleton(field))
-// 1741|      }
-// 1742|      _ => Group(expr~, group = Brace, loc = mk_loc($sloc))
-// 1743|    }
-// 1744|  }
+// 1767|    "{" semi_expr_semi_opt "}" { 
+// 1768|    let (expr, trailing) = $2
+// 1769|    match expr {
+// 1770|      Ident(id = { name: Ident(name~), loc }, ..) => {
+// 1771|        let label = Label::{ name, loc }
+// 1772|        let field = @syntax.make_field_def(loc = mk_loc($sloc), label, expr, true)
+// 1773|        let trailing_mark = if trailing { TrailingMark::Semi } else { TrailingMark::None }
+// 1774|        @syntax.make_record_expr(loc = mk_loc($sloc), trailing = trailing_mark, None, @list.singleton(field))
+// 1775|      }
+// 1776|      _ => Group(expr~, group = Brace, loc = mk_loc($sloc))
+// 1777|    }
+// 1778|  }
 
 ///|
-fn yy_action_404(
+fn yy_action_414(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_405(_args[0].2, _args[1:2])
+  let _sub_action_0_result = yy_action_415(_args[0].2, _args[1:2])
   guard _sub_action_0_result is YYObj__Expr__Bool_(_dollar2)
   let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
   let _end_pos = if _args.length() == 0 {
@@ -15424,13 +16047,13 @@ fn yy_action_404(
 }
 
 // file:///./parser.mbty
-// 1095|    none_empty_list_semis_rev_with_trailing_info(statement) { 
-// 1096|    let (ls, trailing) = $1
-// 1097|    (Statement::compact_rev(ls, loc = mk_loc($sloc)), trailing)
-// 1098|  }
+// 1104|    none_empty_list_semis_rev_with_trailing_info(statement) { 
+// 1105|    let (ls, trailing) = $1
+// 1106|    (Statement::compact_rev(ls, loc = mk_loc($sloc)), trailing)
+// 1107|  }
 
 ///|
-fn yy_action_405(
+fn yy_action_415(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -15454,12 +16077,12 @@ fn yy_action_405(
 }
 
 // file:///./parser.mbty
-// 1745|    "{" list_commas(map_expr_elem) "}" { 
-// 1746|    Map(elems = $2, loc = mk_loc($sloc))
-// 1747|  }
+// 1779|    "{" list_commas(map_expr_elem) "}" { 
+// 1780|    Map(elems = $2, loc = mk_loc($sloc))
+// 1781|  }
 
 ///|
-fn yy_action_406(
+fn yy_action_416(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -15479,10 +16102,10 @@ fn yy_action_406(
 }
 
 // file:///./parser.mbty
-// 220|    non_empty_list_semi_rev_aux(X) option(SEMI) { ($1, $2 is Some(_)) }
+// 225|    non_empty_list_semi_rev_aux(X) option(SEMI) { ($1, $2 is Some(_)) }
 
 ///|
-fn yy_action_407(
+fn yy_action_417(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -15497,10 +16120,10 @@ fn yy_action_407(
 }
 
 // file:///./parser.mbty
-// 191|    non_empty_list_commas(X) { $1 }
+// 196|    non_empty_list_commas(X) { $1 }
 
 ///|
-fn yy_action_408(
+fn yy_action_418(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -15514,12 +16137,12 @@ fn yy_action_408(
 }
 
 // file:///./parser.mbty
-// 423|    "{" list_semis_rev(statement) "}" {
-// 424|    Statement::compact_rev($2, loc = mk_loc($sloc))
-// 425|  }
+// 431|    "{" list_semis_rev(statement) "}" {
+// 432|    Statement::compact_rev($2, loc = mk_loc($sloc))
+// 433|  }
 
 ///|
-fn yy_action_409(
+fn yy_action_419(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -15542,10 +16165,10 @@ fn yy_action_409(
 }
 
 // file:///./parser.mbty
-// 230|    non_empty_list_semis_rev(X) { $1 }
+// 235|    non_empty_list_semis_rev(X) { $1 }
 
 ///|
-fn yy_action_410(
+fn yy_action_420(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -15559,16 +16182,16 @@ fn yy_action_410(
 }
 
 // file:///./parser.mbty
-// 1116|    "let" pattern opt_annot "=" expr { 
-// 1117|    let pat = match $3 {
-// 1118|      None => $2
-// 1119|      Some(ty) => Pattern::Constraint(pat = $2, ty~, loc = mk_loc($sloc))
-// 1120|    }
-// 1121|    StmtLet(pat~, expr = $5, loc = mk_loc($sloc))
-// 1122|  }
+// 1125|    "let" pattern opt_annot "=" expr { 
+// 1126|    let pat = match $3 {
+// 1127|      None => $2
+// 1128|      Some(ty) => Pattern::Constraint(pat = $2, ty~, loc = mk_loc($sloc))
+// 1129|    }
+// 1130|    StmtLet(pat~, expr = $5, loc = mk_loc($sloc))
+// 1131|  }
 
 ///|
-fn yy_action_411(
+fn yy_action_421(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -15600,16 +16223,16 @@ fn yy_action_411(
 }
 
 // file:///./parser.mbty
-// 1116|    "let" pattern opt_annot "=" expr { 
-// 1117|    let pat = match $3 {
-// 1118|      None => $2
-// 1119|      Some(ty) => Pattern::Constraint(pat = $2, ty~, loc = mk_loc($sloc))
-// 1120|    }
-// 1121|    StmtLet(pat~, expr = $5, loc = mk_loc($sloc))
-// 1122|  }
+// 1125|    "let" pattern opt_annot "=" expr { 
+// 1126|    let pat = match $3 {
+// 1127|      None => $2
+// 1128|      Some(ty) => Pattern::Constraint(pat = $2, ty~, loc = mk_loc($sloc))
+// 1129|    }
+// 1130|    StmtLet(pat~, expr = $5, loc = mk_loc($sloc))
+// 1131|  }
 
 ///|
-fn yy_action_412(
+fn yy_action_422(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -15641,12 +16264,12 @@ fn yy_action_412(
 }
 
 // file:///./parser.mbty
-// 1127|    "let" "mut" binder opt_annot "=" expr { 
-// 1128|    StmtLetmut(binder = $3, ty_opt = $4, expr = $6, loc = mk_loc($sloc))
-// 1129|  }
+// 1136|    "let" "mut" binder opt_annot "=" expr { 
+// 1137|    StmtLetmut(binder = $3, ty_opt = $4, expr = $6, loc = mk_loc($sloc))
+// 1138|  }
 
 ///|
-fn yy_action_413(
+fn yy_action_423(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -15675,12 +16298,12 @@ fn yy_action_413(
 }
 
 // file:///./parser.mbty
-// 1127|    "let" "mut" binder opt_annot "=" expr { 
-// 1128|    StmtLetmut(binder = $3, ty_opt = $4, expr = $6, loc = mk_loc($sloc))
-// 1129|  }
+// 1136|    "let" "mut" binder opt_annot "=" expr { 
+// 1137|    StmtLetmut(binder = $3, ty_opt = $4, expr = $6, loc = mk_loc($sloc))
+// 1138|  }
 
 ///|
-fn yy_action_414(
+fn yy_action_424(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -15709,13 +16332,13 @@ fn yy_action_414(
 }
 
 // file:///./parser.mbty
-// 1123|    "letrec" binder opt_annot "=" letand_func list(and_func) {
-// 1124|    let bindings = $6.add(($2, $3, $5))
-// 1125|    StmtLetand(bindings~, loc = mk_loc($sloc))
-// 1126|  }
+// 1132|    "letrec" binder opt_annot "=" letand_func list(and_func) {
+// 1133|    let bindings = $6.add(($2, $3, $5))
+// 1134|    StmtLetand(bindings~, loc = mk_loc($sloc))
+// 1135|  }
 
 ///|
-fn yy_action_415(
+fn yy_action_425(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -15741,13 +16364,13 @@ fn yy_action_415(
 }
 
 // file:///./parser.mbty
-// 1123|    "letrec" binder opt_annot "=" letand_func list(and_func) {
-// 1124|    let bindings = $6.add(($2, $3, $5))
-// 1125|    StmtLetand(bindings~, loc = mk_loc($sloc))
-// 1126|  }
+// 1132|    "letrec" binder opt_annot "=" letand_func list(and_func) {
+// 1133|    let bindings = $6.add(($2, $3, $5))
+// 1134|    StmtLetand(bindings~, loc = mk_loc($sloc))
+// 1135|  }
 
 ///|
-fn yy_action_416(
+fn yy_action_426(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -15773,10 +16396,10 @@ fn yy_action_416(
 }
 
 // file:///./parser.mbty
-// 1112|    "and" binder opt_annot "=" letand_func { ($2, $3, $5) }
+// 1121|    "and" binder opt_annot "=" letand_func { ($2, $3, $5) }
 
 ///|
-fn yy_action_417(
+fn yy_action_427(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -15794,10 +16417,10 @@ fn yy_action_417(
 }
 
 // file:///./parser.mbty
-// 1107|    arrow_fn_expr { $1 }
+// 1116|    arrow_fn_expr { $1 }
 
 ///|
-fn yy_action_418(
+fn yy_action_428(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -15811,10 +16434,10 @@ fn yy_action_418(
 }
 
 // file:///./parser.mbty
-// 1108|    anony_fn { $1 }
+// 1117|    anony_fn { $1 }
 
 ///|
-fn yy_action_419(
+fn yy_action_429(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -15828,10 +16451,10 @@ fn yy_action_419(
 }
 
 // file:///./parser.mbty
-// 1112|    "and" binder opt_annot "=" letand_func { ($2, $3, $5) }
+// 1121|    "and" binder opt_annot "=" letand_func { ($2, $3, $5) }
 
 ///|
-fn yy_action_420(
+fn yy_action_430(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -15852,7 +16475,7 @@ fn yy_action_420(
 // 45|    X list(X) { $2.add($1) }
 
 ///|
-fn yy_action_421(
+fn yy_action_431(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -15870,7 +16493,7 @@ fn yy_action_421(
 // 44|    { @list.empty() }
 
 ///|
-fn yy_action_422(
+fn yy_action_432(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -15883,24 +16506,24 @@ fn yy_action_422(
 }
 
 // file:///./parser.mbty
-// 1130|    is_async "fn" binder optional_bang parameters func_return_type block_expr { 
-// 1131|    let (return_type, error_type) = $6
-// 1132|    let func = Func::{
-// 1133|      parameters : $5,
-// 1134|      params_loc : mk_loc($loc($5)),
-// 1135|      body : $7,
-// 1136|      return_type,
-// 1137|      error_type,
-// 1138|      kind : Lambda,
-// 1139|      has_error : $4,
-// 1140|      is_async : $1,
-// 1141|      loc : mk_loc($sloc)
-// 1142|    }
-// 1143|    StmtFunc(binder = $3, func~, loc = mk_loc($sloc))
-// 1144|  }
+// 1139|    is_async "fn" binder optional_bang parameters func_return_type block_expr { 
+// 1140|    let (return_type, error_type) = $6
+// 1141|    let func = Func::{
+// 1142|      parameters : $5,
+// 1143|      params_loc : mk_loc($loc($5)),
+// 1144|      body : $7,
+// 1145|      return_type,
+// 1146|      error_type,
+// 1147|      kind : Lambda,
+// 1148|      has_error : $4,
+// 1149|      is_async : $1,
+// 1150|      loc : mk_loc($sloc)
+// 1151|    }
+// 1152|    StmtFunc(binder = $3, func~, loc = mk_loc($sloc))
+// 1153|  }
 
 ///|
-fn yy_action_423(
+fn yy_action_433(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -15945,24 +16568,24 @@ fn yy_action_423(
 }
 
 // file:///./parser.mbty
-// 1130|    is_async "fn" binder optional_bang parameters func_return_type block_expr { 
-// 1131|    let (return_type, error_type) = $6
-// 1132|    let func = Func::{
-// 1133|      parameters : $5,
-// 1134|      params_loc : mk_loc($loc($5)),
-// 1135|      body : $7,
-// 1136|      return_type,
-// 1137|      error_type,
-// 1138|      kind : Lambda,
-// 1139|      has_error : $4,
-// 1140|      is_async : $1,
-// 1141|      loc : mk_loc($sloc)
-// 1142|    }
-// 1143|    StmtFunc(binder = $3, func~, loc = mk_loc($sloc))
-// 1144|  }
+// 1139|    is_async "fn" binder optional_bang parameters func_return_type block_expr { 
+// 1140|    let (return_type, error_type) = $6
+// 1141|    let func = Func::{
+// 1142|      parameters : $5,
+// 1143|      params_loc : mk_loc($loc($5)),
+// 1144|      body : $7,
+// 1145|      return_type,
+// 1146|      error_type,
+// 1147|      kind : Lambda,
+// 1148|      has_error : $4,
+// 1149|      is_async : $1,
+// 1150|      loc : mk_loc($sloc)
+// 1151|    }
+// 1152|    StmtFunc(binder = $3, func~, loc = mk_loc($sloc))
+// 1153|  }
 
 ///|
-fn yy_action_424(
+fn yy_action_434(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -16007,10 +16630,10 @@ fn yy_action_424(
 }
 
 // file:///./parser.mbty
-// 1145|    guard_statement { $1 }
+// 1154|    guard_statement { $1 }
 
 ///|
-fn yy_action_425(
+fn yy_action_435(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -16024,10 +16647,10 @@ fn yy_action_425(
 }
 
 // file:///./parser.mbty
-// 1146|    "defer" pipe_expr { StmtDefer(expr = $2, loc = mk_loc($sloc)) }
+// 1155|    "defer" pipe_expr { StmtDefer(expr = $2, loc = mk_loc($sloc)) }
 
 ///|
-fn yy_action_426(
+fn yy_action_436(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -16047,10 +16670,10 @@ fn yy_action_426(
 }
 
 // file:///./parser.mbty
-// 1147|    expr_statement { StmtExpr($1) }
+// 1156|    expr_statement { StmtExpr($1) }
 
 ///|
-fn yy_action_427(
+fn yy_action_437(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -16064,10 +16687,10 @@ fn yy_action_427(
 }
 
 // file:///./parser.mbty
-// 1152|    "guard" infix_expr "else" block_expr { StmtGuard(cond = $2, otherwise = Some($4), loc = mk_loc($sloc)) }
+// 1161|    "guard" infix_expr "else" block_expr { StmtGuard(cond = $2, otherwise = Some($4), loc = mk_loc($sloc)) }
 
 ///|
-fn yy_action_428(
+fn yy_action_438(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -16092,10 +16715,10 @@ fn yy_action_428(
 }
 
 // file:///./parser.mbty
-// 1151|    "guard" infix_expr { StmtGuard(cond = $2, otherwise = None, loc = mk_loc($sloc)) }
+// 1160|    "guard" infix_expr { StmtGuard(cond = $2, otherwise = None, loc = mk_loc($sloc)) }
 
 ///|
-fn yy_action_429(
+fn yy_action_439(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -16119,14 +16742,14 @@ fn yy_action_429(
 }
 
 // file:///./parser.mbty
-// 1722|    type_name COLONCOLON "{" list_commas_with_trailing_info(record_defn_single) "}" { 
-// 1723|    let (fs, trailing) = $4  
-// 1724|    let trailing_mark = if trailing { TrailingMark::Comma } else { TrailingMark::None }
-// 1725|    @syntax.make_record_expr(loc = mk_loc($sloc), trailing = trailing_mark, Some($1), fs)
-// 1726|  }
+// 1756|    type_name COLONCOLON "{" list_commas_with_trailing_info(record_defn_single) "}" { 
+// 1757|    let (fs, trailing) = $4  
+// 1758|    let trailing_mark = if trailing { TrailingMark::Comma } else { TrailingMark::None }
+// 1759|    @syntax.make_record_expr(loc = mk_loc($sloc), trailing = trailing_mark, Some($1), fs)
+// 1760|  }
 
 ///|
-fn yy_action_430(
+fn yy_action_440(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -16158,16 +16781,16 @@ fn yy_action_430(
 }
 
 // file:///./parser.mbty
-// 1727|    ioption(terminated(type_name, COLONCOLON)) "{" ".." expr "}" { 
-// 1728|    RecordUpdate(type_name = $1, record = $4, fields = @list.empty(), loc = mk_loc($sloc))
-// 1729|  }
+// 1761|    ioption(terminated(type_name, COLONCOLON)) "{" ".." expr "}" { 
+// 1762|    RecordUpdate(type_name = $1, record = $4, fields = @list.empty(), loc = mk_loc($sloc))
+// 1763|  }
 
 ///|
-fn yy_action_431(
+fn yy_action_441(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_432(_last_pos, _args[0:2])
+  let _sub_action_0_result = yy_action_442(_last_pos, _args[0:2])
   guard _sub_action_0_result is YYObj_Option_TypeName_(_dollar1)
   guard _args[4].0 is YYObj_Expr(_dollar4)
   let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
@@ -16190,16 +16813,16 @@ fn yy_action_431(
 }
 
 // file:///./parser.mbty
-// 1730|    ioption(terminated(type_name, COLONCOLON)) "{" ".." expr "," list_commas(record_defn_single) "}" { 
-// 1731|    RecordUpdate(type_name = $1, record = $4, fields = $6, loc = mk_loc($sloc))
-// 1732|  }
+// 1764|    ioption(terminated(type_name, COLONCOLON)) "{" ".." expr "," list_commas(record_defn_single) "}" { 
+// 1765|    RecordUpdate(type_name = $1, record = $4, fields = $6, loc = mk_loc($sloc))
+// 1766|  }
 
 ///|
-fn yy_action_433(
+fn yy_action_443(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_432(_last_pos, _args[0:2])
+  let _sub_action_0_result = yy_action_442(_last_pos, _args[0:2])
   guard _sub_action_0_result is YYObj_Option_TypeName_(_dollar1)
   guard _args[4].0 is YYObj_Expr(_dollar4)
   guard _args[6].0 is YYObj_List_FieldDef_(_dollar6)
@@ -16226,11 +16849,11 @@ fn yy_action_433(
 // 10|    X { Some($1) }
 
 ///|
-fn yy_action_432(
+fn yy_action_442(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_434(_last_pos, _args[0:2])
+  let _sub_action_0_result = yy_action_444(_last_pos, _args[0:2])
   guard _sub_action_0_result is YYObj_TypeName(_dollar1)
   YYObj_Option_TypeName_(
     {
@@ -16244,7 +16867,7 @@ fn yy_action_432(
 // 36|    X R { $1 }
 
 ///|
-fn yy_action_434(
+fn yy_action_444(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -16258,10 +16881,10 @@ fn yy_action_434(
 }
 
 // file:///./parser.mbty
-// 191|    non_empty_list_commas(X) { $1 }
+// 196|    non_empty_list_commas(X) { $1 }
 
 ///|
-fn yy_action_435(
+fn yy_action_445(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -16275,10 +16898,10 @@ fn yy_action_435(
 }
 
 // file:///./parser.mbty
-// 182|    non_empty_list_commas_rev(X) option(",") { $1.rev() }
+// 187|    non_empty_list_commas_rev(X) option(",") { $1.rev() }
 
 ///|
-fn yy_action_436(
+fn yy_action_446(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -16292,10 +16915,10 @@ fn yy_action_436(
 }
 
 // file:///./parser.mbty
-// 190|    { @list.empty() }
+// 195|    { @list.empty() }
 
 ///|
-fn yy_action_437(
+fn yy_action_447(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -16308,10 +16931,10 @@ fn yy_action_437(
 }
 
 // file:///./parser.mbty
-// 207|    non_empty_list_commas_with_trailing_info(X) { $1 }
+// 212|    non_empty_list_commas_with_trailing_info(X) { $1 }
 
 ///|
-fn yy_action_438(
+fn yy_action_448(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -16325,10 +16948,10 @@ fn yy_action_438(
 }
 
 // file:///./parser.mbty
-// 1102|    "!" { Some(mk_loc($sloc)) }
+// 1111|    "!" { Some(mk_loc($sloc)) }
 
 ///|
-fn yy_action_439(
+fn yy_action_449(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -16347,14 +16970,14 @@ fn yy_action_439(
 }
 
 // file:///./parser.mbty
-// 272|    delimited("(", list_commas(parameter), ")") { $1 }
+// 277|    delimited("(", list_commas(parameter), ")") { $1 }
 
 ///|
-fn yy_action_440(
+fn yy_action_450(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_441(_last_pos, _args[0:3])
+  let _sub_action_0_result = yy_action_451(_last_pos, _args[0:3])
   guard _sub_action_0_result is YYObj_List_Parameter_(_dollar1)
   YYObj_List_Parameter_(
     {
@@ -16368,7 +16991,7 @@ fn yy_action_440(
 // 40|    L X R { $2 }
 
 ///|
-fn yy_action_441(
+fn yy_action_451(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -16382,10 +17005,10 @@ fn yy_action_441(
 }
 
 // file:///./parser.mbty
-// 191|    non_empty_list_commas(X) { $1 }
+// 196|    non_empty_list_commas(X) { $1 }
 
 ///|
-fn yy_action_442(
+fn yy_action_452(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -16399,10 +17022,10 @@ fn yy_action_442(
 }
 
 // file:///./parser.mbty
-// 251|    "_" opt_annot { DiscardPositional(ty = $2, loc = mk_loc($loc($1))) }
+// 256|    "_" opt_annot { DiscardPositional(ty = $2, loc = mk_loc($loc($1))) }
 
 ///|
-fn yy_action_443(
+fn yy_action_453(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -16422,10 +17045,10 @@ fn yy_action_443(
 }
 
 // file:///./parser.mbty
-// 251|    "_" opt_annot { DiscardPositional(ty = $2, loc = mk_loc($loc($1))) }
+// 256|    "_" opt_annot { DiscardPositional(ty = $2, loc = mk_loc($loc($1))) }
 
 ///|
-fn yy_action_444(
+fn yy_action_454(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -16445,10 +17068,10 @@ fn yy_action_444(
 }
 
 // file:///./parser.mbty
-// 252|    binder opt_annot { Positional(binder = $1, ty = $2) }
+// 257|    binder opt_annot { Positional(binder = $1, ty = $2) }
 
 ///|
-fn yy_action_445(
+fn yy_action_455(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -16465,13 +17088,13 @@ fn yy_action_445(
 }
 
 // file:///./parser.mbty
-// 261|    LIDENT "?" opt_annot "=" expr {
-// 262|      let binder = Binder::{ name: $1, loc: mk_loc($loc($1)) }
-// 263|      Optional(binder~, ty = $3, default = $5)
-// 264|    }
+// 266|    LIDENT "?" opt_annot "=" expr {
+// 267|      let binder = Binder::{ name: $1, loc: mk_loc($loc($1)) }
+// 268|      Optional(binder~, ty = $3, default = $5)
+// 269|    }
 
 ///|
-fn yy_action_446(
+fn yy_action_456(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -16494,13 +17117,13 @@ fn yy_action_446(
 }
 
 // file:///./parser.mbty
-// 261|    LIDENT "?" opt_annot "=" expr {
-// 262|      let binder = Binder::{ name: $1, loc: mk_loc($loc($1)) }
-// 263|      Optional(binder~, ty = $3, default = $5)
-// 264|    }
+// 266|    LIDENT "?" opt_annot "=" expr {
+// 267|      let binder = Binder::{ name: $1, loc: mk_loc($loc($1)) }
+// 268|      Optional(binder~, ty = $3, default = $5)
+// 269|    }
 
 ///|
-fn yy_action_447(
+fn yy_action_457(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -16523,13 +17146,13 @@ fn yy_action_447(
 }
 
 // file:///./parser.mbty
-// 265|    LIDENT "?" opt_annot {
-// 266|      let binder = Binder::{ name: $1, loc: mk_loc($loc($1)) }
-// 267|      QuestionOptional(binder~, ty = $3)
-// 268|    }
+// 270|    LIDENT "?" opt_annot {
+// 271|      let binder = Binder::{ name: $1, loc: mk_loc($loc($1)) }
+// 272|      QuestionOptional(binder~, ty = $3)
+// 273|    }
 
 ///|
-fn yy_action_448(
+fn yy_action_458(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -16551,13 +17174,13 @@ fn yy_action_448(
 }
 
 // file:///./parser.mbty
-// 265|    LIDENT "?" opt_annot {
-// 266|      let binder = Binder::{ name: $1, loc: mk_loc($loc($1)) }
-// 267|      QuestionOptional(binder~, ty = $3)
-// 268|    }
+// 270|    LIDENT "?" opt_annot {
+// 271|      let binder = Binder::{ name: $1, loc: mk_loc($loc($1)) }
+// 272|      QuestionOptional(binder~, ty = $3)
+// 273|    }
 
 ///|
-fn yy_action_449(
+fn yy_action_459(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -16579,10 +17202,10 @@ fn yy_action_449(
 }
 
 // file:///./parser.mbty
-// 252|    binder opt_annot { Positional(binder = $1, ty = $2) }
+// 257|    binder opt_annot { Positional(binder = $1, ty = $2) }
 
 ///|
-fn yy_action_450(
+fn yy_action_460(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -16599,13 +17222,13 @@ fn yy_action_450(
 }
 
 // file:///./parser.mbty
-// 257|    POST_LABEL opt_annot "=" expr {
-// 258|      let binder = Binder::{ name: $1, loc: mk_loc($loc($1)).trim_last_char() }
-// 259|      Optional(binder~, ty = $2, default = $4)
-// 260|    }
+// 262|    POST_LABEL opt_annot "=" expr {
+// 263|      let binder = Binder::{ name: $1, loc: mk_loc($loc($1)).trim_last_char() }
+// 264|      Optional(binder~, ty = $2, default = $4)
+// 265|    }
 
 ///|
-fn yy_action_451(
+fn yy_action_461(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -16628,13 +17251,13 @@ fn yy_action_451(
 }
 
 // file:///./parser.mbty
-// 253|    POST_LABEL opt_annot {
-// 254|      let binder = Binder::{ name: $1, loc: mk_loc($loc($1)).trim_last_char() }
-// 255|      Labelled(binder~, ty = $2)
-// 256|    }
+// 258|    POST_LABEL opt_annot {
+// 259|      let binder = Binder::{ name: $1, loc: mk_loc($loc($1)).trim_last_char() }
+// 260|      Labelled(binder~, ty = $2)
+// 261|    }
 
 ///|
-fn yy_action_452(
+fn yy_action_462(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -16656,14 +17279,14 @@ fn yy_action_452(
 }
 
 // file:///./parser.mbty
-// 247|    ioption(annot) { $1 }
+// 252|    ioption(annot) { $1 }
 
 ///|
 fn yy_action_17(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_453(_last_pos, _args[0:2])
+  let _sub_action_0_result = yy_action_463(_last_pos, _args[0:2])
   guard _sub_action_0_result is YYObj_Option_Type_(_dollar1)
   YYObj_Type_(
     {
@@ -16677,11 +17300,11 @@ fn yy_action_17(
 // 10|    X { Some($1) }
 
 ///|
-fn yy_action_453(
+fn yy_action_463(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_454(_last_pos, _args[0:2])
+  let _sub_action_0_result = yy_action_464(_last_pos, _args[0:2])
   guard _sub_action_0_result is YYObj_Type(_dollar1)
   YYObj_Option_Type_(
     {
@@ -16692,13 +17315,13 @@ fn yy_action_453(
 }
 
 // file:///./parser.mbty
-// 257|    POST_LABEL opt_annot "=" expr {
-// 258|      let binder = Binder::{ name: $1, loc: mk_loc($loc($1)).trim_last_char() }
-// 259|      Optional(binder~, ty = $2, default = $4)
-// 260|    }
+// 262|    POST_LABEL opt_annot "=" expr {
+// 263|      let binder = Binder::{ name: $1, loc: mk_loc($loc($1)).trim_last_char() }
+// 264|      Optional(binder~, ty = $2, default = $4)
+// 265|    }
 
 ///|
-fn yy_action_455(
+fn yy_action_465(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -16721,24 +17344,24 @@ fn yy_action_455(
 }
 
 // file:///./parser.mbty
-// 1786|    simple_expr ".." LIDENT apply_attr "(" list_commas(argument) ")" { 
-// 1787|    let method_name = Label::{ name: $3, loc: mk_loc($loc($3)) }
-// 1788|    DotApply(
-// 1789|      self = $1,
-// 1790|      method_name~,
-// 1791|      args = $6,
-// 1792|      return_self = true,
-// 1793|      attr = $4,
-// 1794|      loc = mk_loc($sloc)
-// 1795|    )
-// 1796|  }
+// 1820|    simple_expr ".." LIDENT apply_attr "(" list_commas(argument) ")" { 
+// 1821|    let method_name = Label::{ name: $3, loc: mk_loc($loc($3)) }
+// 1822|    DotApply(
+// 1823|      self = $1,
+// 1824|      method_name~,
+// 1825|      args = $6,
+// 1826|      return_self = true,
+// 1827|      attr = $4,
+// 1828|      loc = mk_loc($sloc)
+// 1829|    )
+// 1830|  }
 
 ///|
-fn yy_action_456(
+fn yy_action_466(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_457(_args[2].2, _args[3:3])
+  let _sub_action_0_result = yy_action_467(_args[2].2, _args[3:3])
   guard _args[2].0 is YYObj_String(_dollar3)
   let _start_pos_of_item2 = _args[2].1
   let _end_pos_of_item2 = _args[2].2
@@ -16771,24 +17394,24 @@ fn yy_action_456(
 }
 
 // file:///./parser.mbty
-// 1786|    simple_expr ".." LIDENT apply_attr "(" list_commas(argument) ")" { 
-// 1787|    let method_name = Label::{ name: $3, loc: mk_loc($loc($3)) }
-// 1788|    DotApply(
-// 1789|      self = $1,
-// 1790|      method_name~,
-// 1791|      args = $6,
-// 1792|      return_self = true,
-// 1793|      attr = $4,
-// 1794|      loc = mk_loc($sloc)
-// 1795|    )
-// 1796|  }
+// 1820|    simple_expr ".." LIDENT apply_attr "(" list_commas(argument) ")" { 
+// 1821|    let method_name = Label::{ name: $3, loc: mk_loc($loc($3)) }
+// 1822|    DotApply(
+// 1823|      self = $1,
+// 1824|      method_name~,
+// 1825|      args = $6,
+// 1826|      return_self = true,
+// 1827|      attr = $4,
+// 1828|      loc = mk_loc($sloc)
+// 1829|    )
+// 1830|  }
 
 ///|
-fn yy_action_458(
+fn yy_action_468(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_459(_args[2].2, _args[3:4])
+  let _sub_action_0_result = yy_action_469(_args[2].2, _args[3:4])
   guard _args[2].0 is YYObj_String(_dollar3)
   let _start_pos_of_item2 = _args[2].1
   let _end_pos_of_item2 = _args[2].2
@@ -16821,24 +17444,24 @@ fn yy_action_458(
 }
 
 // file:///./parser.mbty
-// 1786|    simple_expr ".." LIDENT apply_attr "(" list_commas(argument) ")" { 
-// 1787|    let method_name = Label::{ name: $3, loc: mk_loc($loc($3)) }
-// 1788|    DotApply(
-// 1789|      self = $1,
-// 1790|      method_name~,
-// 1791|      args = $6,
-// 1792|      return_self = true,
-// 1793|      attr = $4,
-// 1794|      loc = mk_loc($sloc)
-// 1795|    )
-// 1796|  }
+// 1820|    simple_expr ".." LIDENT apply_attr "(" list_commas(argument) ")" { 
+// 1821|    let method_name = Label::{ name: $3, loc: mk_loc($loc($3)) }
+// 1822|    DotApply(
+// 1823|      self = $1,
+// 1824|      method_name~,
+// 1825|      args = $6,
+// 1826|      return_self = true,
+// 1827|      attr = $4,
+// 1828|      loc = mk_loc($sloc)
+// 1829|    )
+// 1830|  }
 
 ///|
-fn yy_action_460(
+fn yy_action_470(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_461(_args[2].2, _args[3:4])
+  let _sub_action_0_result = yy_action_471(_args[2].2, _args[3:4])
   guard _args[2].0 is YYObj_String(_dollar3)
   let _start_pos_of_item2 = _args[2].1
   let _end_pos_of_item2 = _args[2].2
@@ -16871,10 +17494,10 @@ fn yy_action_460(
 }
 
 // file:///./parser.mbty
-// 1616|    "!" prefix_expr { make_unot(loc = mk_loc($sloc), $2) }
+// 1650|    "!" prefix_expr { make_unot(loc = mk_loc($sloc), $2) }
 
 ///|
-fn yy_action_462(
+fn yy_action_472(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -16894,12 +17517,12 @@ fn yy_action_462(
 }
 
 // file:///./parser.mbty
-// 1509|    "_" "=>" expr_statement_no_break_continue_return { 
-// 1510|    make_arrow_fn(@list.singleton((Unnamed(mk_loc($loc($1))), None)), $3, params_loc = mk_loc($loc($1)), loc = mk_loc($sloc))
-// 1511|  }
+// 1543|    "_" "=>" expr_statement_no_break_continue_return { 
+// 1544|    make_arrow_fn(@list.singleton((Unnamed(mk_loc($loc($1))), None)), $3, params_loc = mk_loc($loc($1)), loc = mk_loc($sloc))
+// 1545|  }
 
 ///|
-fn yy_action_463(
+fn yy_action_473(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -16928,24 +17551,24 @@ fn yy_action_463(
 }
 
 // file:///./parser.mbty
-// 1775|    simple_expr DOT_LIDENT apply_attr "(" list_commas(argument) ")" { 
-// 1776|    let method_name = Label::{ name: $2, loc: mk_loc($loc($2)) }
-// 1777|    DotApply(
-// 1778|      self = $1,
-// 1779|      method_name~,
-// 1780|      args = $5,
-// 1781|      return_self = false,
-// 1782|      attr = $3,
-// 1783|      loc = mk_loc($sloc)
-// 1784|    )
-// 1785|  }
+// 1809|    simple_expr DOT_LIDENT apply_attr "(" list_commas(argument) ")" { 
+// 1810|    let method_name = Label::{ name: $2, loc: mk_loc($loc($2)) }
+// 1811|    DotApply(
+// 1812|      self = $1,
+// 1813|      method_name~,
+// 1814|      args = $5,
+// 1815|      return_self = false,
+// 1816|      attr = $3,
+// 1817|      loc = mk_loc($sloc)
+// 1818|    )
+// 1819|  }
 
 ///|
-fn yy_action_464(
+fn yy_action_474(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_457(_args[1].2, _args[2:2])
+  let _sub_action_0_result = yy_action_467(_args[1].2, _args[2:2])
   guard _args[1].0 is YYObj_String(_dollar2)
   let _start_pos_of_item1 = _args[1].1
   let _end_pos_of_item1 = _args[1].2
@@ -16978,24 +17601,24 @@ fn yy_action_464(
 }
 
 // file:///./parser.mbty
-// 1775|    simple_expr DOT_LIDENT apply_attr "(" list_commas(argument) ")" { 
-// 1776|    let method_name = Label::{ name: $2, loc: mk_loc($loc($2)) }
-// 1777|    DotApply(
-// 1778|      self = $1,
-// 1779|      method_name~,
-// 1780|      args = $5,
-// 1781|      return_self = false,
-// 1782|      attr = $3,
-// 1783|      loc = mk_loc($sloc)
-// 1784|    )
-// 1785|  }
+// 1809|    simple_expr DOT_LIDENT apply_attr "(" list_commas(argument) ")" { 
+// 1810|    let method_name = Label::{ name: $2, loc: mk_loc($loc($2)) }
+// 1811|    DotApply(
+// 1812|      self = $1,
+// 1813|      method_name~,
+// 1814|      args = $5,
+// 1815|      return_self = false,
+// 1816|      attr = $3,
+// 1817|      loc = mk_loc($sloc)
+// 1818|    )
+// 1819|  }
 
 ///|
-fn yy_action_465(
+fn yy_action_475(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_459(_args[1].2, _args[2:3])
+  let _sub_action_0_result = yy_action_469(_args[1].2, _args[2:3])
   guard _args[1].0 is YYObj_String(_dollar2)
   let _start_pos_of_item1 = _args[1].1
   let _end_pos_of_item1 = _args[1].2
@@ -17028,24 +17651,24 @@ fn yy_action_465(
 }
 
 // file:///./parser.mbty
-// 1775|    simple_expr DOT_LIDENT apply_attr "(" list_commas(argument) ")" { 
-// 1776|    let method_name = Label::{ name: $2, loc: mk_loc($loc($2)) }
-// 1777|    DotApply(
-// 1778|      self = $1,
-// 1779|      method_name~,
-// 1780|      args = $5,
-// 1781|      return_self = false,
-// 1782|      attr = $3,
-// 1783|      loc = mk_loc($sloc)
-// 1784|    )
-// 1785|  }
+// 1809|    simple_expr DOT_LIDENT apply_attr "(" list_commas(argument) ")" { 
+// 1810|    let method_name = Label::{ name: $2, loc: mk_loc($loc($2)) }
+// 1811|    DotApply(
+// 1812|      self = $1,
+// 1813|      method_name~,
+// 1814|      args = $5,
+// 1815|      return_self = false,
+// 1816|      attr = $3,
+// 1817|      loc = mk_loc($sloc)
+// 1818|    )
+// 1819|  }
 
 ///|
-fn yy_action_466(
+fn yy_action_476(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_461(_args[1].2, _args[2:3])
+  let _sub_action_0_result = yy_action_471(_args[1].2, _args[2:3])
   guard _args[1].0 is YYObj_String(_dollar2)
   let _start_pos_of_item1 = _args[1].1
   let _end_pos_of_item1 = _args[1].2
@@ -17078,14 +17701,14 @@ fn yy_action_466(
 }
 
 // file:///./parser.mbty
-// 1630|    simple_expr accessor { Field($1, $2) }
+// 1664|    simple_expr accessor { Field($1, $2) }
 
 ///|
-fn yy_action_467(
+fn yy_action_477(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_468(_args[0].2, _args[1:2])
+  let _sub_action_0_result = yy_action_478(_args[0].2, _args[1:2])
   guard _args[0].0 is YYObj_Expr(_dollar1)
   guard _sub_action_0_result is YYObj_Accessor(_dollar2)
   YYObj_LeftValue(
@@ -17097,16 +17720,16 @@ fn yy_action_467(
 }
 
 // file:///./parser.mbty
-// 1797|    simple_expr accessor %prec prec_field { 
-// 1798|    Field(record = $1, accessor = $2, loc = mk_loc($sloc))
-// 1799|  }
+// 1831|    simple_expr accessor %prec prec_field { 
+// 1832|    Field(record = $1, accessor = $2, loc = mk_loc($sloc))
+// 1833|  }
 
 ///|
-fn yy_action_469(
+fn yy_action_479(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_468(_args[0].2, _args[1:2])
+  let _sub_action_0_result = yy_action_478(_args[0].2, _args[1:2])
   guard _args[0].0 is YYObj_Expr(_dollar1)
   guard _sub_action_0_result is YYObj_Accessor(_dollar2)
   let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
@@ -17128,16 +17751,16 @@ fn yy_action_469(
 }
 
 // file:///./parser.mbty
-// 1813|    DOT_LIDENT { 
-// 1814|    if $1 == "_" {
-// 1815|      Newtype(loc = mk_loc($loc($1)))
-// 1816|    } else {
-// 1817|      Label(Label::{ name: $1, loc: mk_loc($sloc) })
-// 1818|    }
-// 1819|  }
+// 1847|    DOT_LIDENT { 
+// 1848|    if $1 == "_" {
+// 1849|      Newtype(loc = mk_loc($loc($1)))
+// 1850|    } else {
+// 1851|      Label(Label::{ name: $1, loc: mk_loc($sloc) })
+// 1852|    }
+// 1853|  }
 
 ///|
-fn yy_action_468(
+fn yy_action_478(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -17166,14 +17789,14 @@ fn yy_action_468(
 }
 
 // file:///./parser.mbty
-// 1630|    simple_expr accessor { Field($1, $2) }
+// 1664|    simple_expr accessor { Field($1, $2) }
 
 ///|
-fn yy_action_470(
+fn yy_action_480(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_471(_args[0].2, _args[1:2])
+  let _sub_action_0_result = yy_action_481(_args[0].2, _args[1:2])
   guard _args[0].0 is YYObj_Expr(_dollar1)
   guard _sub_action_0_result is YYObj_Accessor(_dollar2)
   YYObj_LeftValue(
@@ -17185,10 +17808,10 @@ fn yy_action_470(
 }
 
 // file:///./parser.mbty
-// 1631|    simple_expr "[" expr "]" { Array($1, $3) }
+// 1665|    simple_expr "[" expr "]" { Array($1, $3) }
 
 ///|
-fn yy_action_472(
+fn yy_action_482(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -17203,12 +17826,12 @@ fn yy_action_472(
 }
 
 // file:///./parser.mbty
-// 1763|    simple_expr "[" expr "]" { 
-// 1764|    ArrayGet(array = $1, index = $3, loc = mk_loc($sloc))
-// 1765|  }
+// 1797|    simple_expr "[" expr "]" { 
+// 1798|    ArrayGet(array = $1, index = $3, loc = mk_loc($sloc))
+// 1799|  }
 
 ///|
-fn yy_action_473(
+fn yy_action_483(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -17233,18 +17856,18 @@ fn yy_action_473(
 }
 
 // file:///./parser.mbty
-// 1766|    simple_expr "[" option(expr) ":" option(expr) "]" { 
-// 1767|    ArrayGetSlice(
-// 1768|      array = $1,
-// 1769|      start_index = $3,
-// 1770|      end_index = $5,
-// 1771|      index_loc = mk_loc(($loc($2).0, $loc($6).1)),
-// 1772|      loc = mk_loc($sloc)
-// 1773|    )
-// 1774|  }
+// 1800|    simple_expr "[" option(expr) ":" option(expr) "]" { 
+// 1801|    ArrayGetSlice(
+// 1802|      array = $1,
+// 1803|      start_index = $3,
+// 1804|      end_index = $5,
+// 1805|      index_loc = mk_loc(($loc($2).0, $loc($6).1)),
+// 1806|      loc = mk_loc($sloc)
+// 1807|    )
+// 1808|  }
 
 ///|
-fn yy_action_474(
+fn yy_action_484(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -17281,16 +17904,16 @@ fn yy_action_474(
 }
 
 // file:///./parser.mbty
-// 1760|    simple_expr apply_attr "(" list_commas(argument) ")" { 
-// 1761|    Apply(func = $1, args = $4, attr = $2, loc = mk_loc($sloc))
-// 1762|  }
+// 1794|    simple_expr apply_attr "(" list_commas(argument) ")" { 
+// 1795|    Apply(func = $1, args = $4, attr = $2, loc = mk_loc($sloc))
+// 1796|  }
 
 ///|
-fn yy_action_475(
+fn yy_action_485(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_457(_args[0].2, _args[1:1])
+  let _sub_action_0_result = yy_action_467(_args[0].2, _args[1:1])
   guard _args[0].0 is YYObj_Expr(_dollar1)
   guard _args[2].0 is YYObj_List_Argument_(_dollar4)
   guard _sub_action_0_result is YYObj_ApplyAttr(_dollar2)
@@ -17314,10 +17937,10 @@ fn yy_action_475(
 }
 
 // file:///./parser.mbty
-// 1659|     { NoAttr }
+// 1693|     { NoAttr }
 
 ///|
-fn yy_action_457(
+fn yy_action_467(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -17330,16 +17953,16 @@ fn yy_action_457(
 }
 
 // file:///./parser.mbty
-// 1760|    simple_expr apply_attr "(" list_commas(argument) ")" { 
-// 1761|    Apply(func = $1, args = $4, attr = $2, loc = mk_loc($sloc))
-// 1762|  }
+// 1794|    simple_expr apply_attr "(" list_commas(argument) ")" { 
+// 1795|    Apply(func = $1, args = $4, attr = $2, loc = mk_loc($sloc))
+// 1796|  }
 
 ///|
-fn yy_action_476(
+fn yy_action_486(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_459(_args[0].2, _args[1:2])
+  let _sub_action_0_result = yy_action_469(_args[0].2, _args[1:2])
   guard _args[0].0 is YYObj_Expr(_dollar1)
   guard _args[3].0 is YYObj_List_Argument_(_dollar4)
   guard _sub_action_0_result is YYObj_ApplyAttr(_dollar2)
@@ -17363,10 +17986,10 @@ fn yy_action_476(
 }
 
 // file:///./parser.mbty
-// 1660|    "!" { Exclamation }
+// 1694|    "!" { Exclamation }
 
 ///|
-fn yy_action_459(
+fn yy_action_469(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -17379,15 +18002,15 @@ fn yy_action_459(
 }
 
 // file:///./parser.mbty
-// 1934|    LIDENT "?" { 
-// 1935|    let loc = mk_loc($loc($1))
-// 1936|    let label = Label::{ name: $1, loc }
-// 1937|    let arg_value = @syntax.make_ident_expr(loc~, Var::{ name: Ident(name = $1), loc })
-// 1938|    Argument::{ value: arg_value, kind: LabelledOptionPun(label~, question_loc = mk_loc($loc($2))) }
-// 1939|  }
+// 1968|    LIDENT "?" { 
+// 1969|    let loc = mk_loc($loc($1))
+// 1970|    let label = Label::{ name: $1, loc }
+// 1971|    let arg_value = @syntax.make_ident_expr(loc~, Var::{ name: Ident(name = $1), loc })
+// 1972|    Argument::{ value: arg_value, kind: LabelledOptionPun(label~, question_loc = mk_loc($loc($2))) }
+// 1973|  }
 
 ///|
-fn yy_action_477(
+fn yy_action_487(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -17417,10 +18040,10 @@ fn yy_action_477(
 }
 
 // file:///./parser.mbty
-// 1911|    "?" { Some(mk_loc($sloc)) }
+// 1945|    "?" { Some(mk_loc($sloc)) }
 
 ///|
-fn yy_action_478(
+fn yy_action_488(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -17439,20 +18062,20 @@ fn yy_action_478(
 }
 
 // file:///./parser.mbty
-// 1916|    label optional_question "=" expr { 
-// 1917|    let arg_kind : ArgumentKind = match $2 {
-// 1918|      Some(question_loc) => LabelledOption(label = $1, question_loc~)
-// 1919|      None => Labelled($1)
-// 1920|    }
-// 1921|    Argument::{ value: $4, kind: arg_kind }
-// 1922|  }
+// 1950|    label optional_question "=" expr { 
+// 1951|    let arg_kind : ArgumentKind = match $2 {
+// 1952|      Some(question_loc) => LabelledOption(label = $1, question_loc~)
+// 1953|      None => Labelled($1)
+// 1954|    }
+// 1955|    Argument::{ value: $4, kind: arg_kind }
+// 1956|  }
 
 ///|
-fn yy_action_479(
+fn yy_action_489(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_480(_last_pos, _args[0:1])
+  let _sub_action_0_result = yy_action_490(_last_pos, _args[0:1])
   guard _args[1].0 is YYObj_Location_(_dollar2)
   guard _sub_action_0_result is YYObj_Label(_dollar1)
   guard _args[3].0 is YYObj_Expr(_dollar4)
@@ -17469,10 +18092,10 @@ fn yy_action_479(
 }
 
 // file:///./parser.mbty
-// 1912|     { None }
+// 1946|     { None }
 
 ///|
-fn yy_action_481(
+fn yy_action_491(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -17485,14 +18108,14 @@ fn yy_action_481(
 }
 
 // file:///./parser.mbty
-// 1929|    POST_LABEL "=" expr {
-// 1930|    let label = Label::{ name: $1, loc: mk_loc($loc($1)) }
-// 1931|    let arg_value = $3
-// 1932|    Argument::{ value: arg_value, kind: Labelled(label) }
-// 1933|  }
+// 1963|    POST_LABEL "=" expr {
+// 1964|    let label = Label::{ name: $1, loc: mk_loc($loc($1)) }
+// 1965|    let arg_value = $3
+// 1966|    Argument::{ value: arg_value, kind: Labelled(label) }
+// 1967|  }
 
 ///|
-fn yy_action_482(
+fn yy_action_492(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -17514,14 +18137,14 @@ fn yy_action_482(
 }
 
 // file:///./parser.mbty
-// 1924|    POST_LABEL { 
-// 1925|    let label = Label::{ name: $1, loc: mk_loc($loc($1)) }
-// 1926|    let arg_value = @syntax.make_ident_expr(loc = mk_loc($loc($1)), Var::{ name: Ident(name = $1), loc: mk_loc($loc($1)) })
-// 1927|    Argument::{ value: arg_value, kind: LabelledPun(label) }
-// 1928|  }
+// 1958|    POST_LABEL { 
+// 1959|    let label = Label::{ name: $1, loc: mk_loc($loc($1)) }
+// 1960|    let arg_value = @syntax.make_ident_expr(loc = mk_loc($loc($1)), Var::{ name: Ident(name = $1), loc: mk_loc($loc($1)) })
+// 1961|    Argument::{ value: arg_value, kind: LabelledPun(label) }
+// 1962|  }
 
 ///|
-fn yy_action_483(
+fn yy_action_493(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -17548,10 +18171,10 @@ fn yy_action_483(
 }
 
 // file:///./parser.mbty
-// 1694|    "(" binder ":" type_ ")" { Constraint(expr = @syntax.binder_to_expr($2), ty = $4, loc = mk_loc($sloc)) }
+// 1728|    "(" binder ":" type_ ")" { Constraint(expr = @syntax.binder_to_expr($2), ty = $4, loc = mk_loc($sloc)) }
 
 ///|
-fn yy_action_484(
+fn yy_action_494(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -17577,12 +18200,12 @@ fn yy_action_484(
 }
 
 // file:///./parser.mbty
-// 1500|    "(" arrow_fn_prefix "=>" expr_statement_no_break_continue_return { 
-// 1501|    make_arrow_fn($2, $4, params_loc = mk_loc($loc($1)).merge(mk_loc($loc($2))), loc = mk_loc($sloc))
-// 1502|  }
+// 1534|    "(" arrow_fn_prefix "=>" expr_statement_no_break_continue_return { 
+// 1535|    make_arrow_fn($2, $4, params_loc = mk_loc($loc($1)).merge(mk_loc($loc($2))), loc = mk_loc($sloc))
+// 1536|  }
 
 ///|
-fn yy_action_485(
+fn yy_action_495(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -17614,12 +18237,12 @@ fn yy_action_485(
 }
 
 // file:///./parser.mbty
-// 1503|    "(" ")" "=>" expr_statement_no_break_continue_return { 
-// 1504|    make_arrow_fn(@list.empty(), $4, params_loc = mk_loc($loc($1)).merge(mk_loc($loc($2))),loc = mk_loc($sloc))
-// 1505|  }
+// 1537|    "(" ")" "=>" expr_statement_no_break_continue_return { 
+// 1538|    make_arrow_fn(@list.empty(), $4, params_loc = mk_loc($loc($1)).merge(mk_loc($loc($2))),loc = mk_loc($sloc))
+// 1539|  }
 
 ///|
-fn yy_action_486(
+fn yy_action_496(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -17650,15 +18273,15 @@ fn yy_action_486(
 }
 
 // file:///./parser.mbty
-// 1526|    binder ioption(",") ")" { @list.singleton(Named($1)) }
+// 1560|    binder ioption(",") ")" { @list.singleton(Named($1)) }
 
 ///|
-fn yy_action_487(
+fn yy_action_497(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
   let _sub_action_0_result = yy_action_16(_last_pos, _args[0:1])
-  let _sub_action_1_result = yy_action_488(_args[0].2, _args[1:1])
+  let _sub_action_1_result = yy_action_498(_args[0].2, _args[1:1])
   guard _sub_action_0_result is YYObj_Binder(_dollar1)
   YYObj_List_ArrowFnParam_(
     {
@@ -17669,15 +18292,15 @@ fn yy_action_487(
 }
 
 // file:///./parser.mbty
-// 1526|    binder ioption(",") ")" { @list.singleton(Named($1)) }
+// 1560|    binder ioption(",") ")" { @list.singleton(Named($1)) }
 
 ///|
-fn yy_action_489(
+fn yy_action_499(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
   let _sub_action_0_result = yy_action_16(_last_pos, _args[0:1])
-  let _sub_action_1_result = yy_action_490(_args[0].2, _args[1:2])
+  let _sub_action_1_result = yy_action_500(_args[0].2, _args[1:2])
   guard _sub_action_0_result is YYObj_Binder(_dollar1)
   YYObj_List_ArrowFnParam_(
     {
@@ -17688,10 +18311,10 @@ fn yy_action_489(
 }
 
 // file:///./parser.mbty
-// 1528|    binder "," arrow_fn_prefix_no_constraint { $3.add(Named($1)) }
+// 1562|    binder "," arrow_fn_prefix_no_constraint { $3.add(Named($1)) }
 
 ///|
-fn yy_action_491(
+fn yy_action_501(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -17707,10 +18330,10 @@ fn yy_action_491(
 }
 
 // file:///./parser.mbty
-// 1670|    binder "," non_empty_tuple_elems_with_prefix { $3.add(@syntax.binder_to_expr($1)) }
+// 1704|    binder "," non_empty_tuple_elems_with_prefix { $3.add(@syntax.binder_to_expr($1)) }
 
 ///|
-fn yy_action_492(
+fn yy_action_502(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -17726,23 +18349,79 @@ fn yy_action_492(
 }
 
 // file:///./parser.mbty
-// 1482|    pipe_expr catch_keyword single_pattern_cases "}" { 
-// 1483|    let (catch_all, catch_loc) = $2
-// 1484|    Try(
-// 1485|      body = $1,
-// 1486|      catch_ = $3,
-// 1487|      catch_all~,
-// 1488|      try_else = None,
-// 1489|      has_try = false,
-// 1490|      try_loc = mk_loc($loc($1)),
-// 1491|      catch_loc~,
-// 1492|      else_loc = Location::{ start: Position::{ fname: "", lnum: 0, bol: 0, cnum: 0 }, end: Position::{ fname: "", lnum: 0, bol: 0, cnum: 0 } },
-// 1493|      loc = mk_loc($sloc)
-// 1494|    )
-// 1495|  }
+// 1515|    pipe_expr catch_keyword single_pattern_cases "}" else_keyword single_pattern_cases "}" {
+// 1516|    let (catch_all, catch_loc) = $2
+// 1517|    let else_loc = $5
+// 1518|    Try(
+// 1519|      body = $1,
+// 1520|      catch_ = $3,
+// 1521|      catch_all~,
+// 1522|      try_else = Some($6),
+// 1523|      has_try = false,
+// 1524|      try_loc = mk_loc($loc($1)),
+// 1525|      catch_loc~,
+// 1526|      else_loc~,
+// 1527|      loc = mk_loc($sloc)
+// 1528|    )
+// 1529|  }
 
 ///|
-fn yy_action_493(
+fn yy_action_503(
+  _last_pos : Position,
+  _args : ArrayView[(YYObj, Position, Position)],
+) -> YYObj {
+  let _sub_action_0_result = yy_action_504(_args[3].2, _args[4:6])
+  guard _args[1].0 is YYObj__Bool__Location_(_dollar2)
+  guard _sub_action_0_result is YYObj_Location(_dollar5)
+  guard _args[0].0 is YYObj_Expr(_dollar1)
+  guard _args[2].0 is YYObj_List_Case_(_dollar3)
+  guard _args[6].0 is YYObj_List_Case_(_dollar6)
+  let _start_pos_of_item0 = _args[0].1
+  let _end_pos_of_item0 = _args[0].2
+  let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
+  let _end_pos = if _args.length() == 0 {
+    _last_pos
+  } else {
+    _args[_args.length() - 1].2
+  }
+  YYObj_Expr(
+    {
+      ()
+      let (catch_all, catch_loc) = _dollar2
+      let else_loc = _dollar5
+      Try(
+        body=_dollar1,
+        catch_=_dollar3,
+        catch_all~,
+        try_else=Some(_dollar6),
+        has_try=false,
+        try_loc=mk_loc((_start_pos_of_item0, _end_pos_of_item0)),
+        catch_loc~,
+        else_loc~,
+        loc=mk_loc((_symbol_start_pos, _end_pos)),
+      )
+    },
+  )
+}
+
+// file:///./parser.mbty
+// 1501|    pipe_expr catch_keyword single_pattern_cases "}" { 
+// 1502|    let (catch_all, catch_loc) = $2
+// 1503|    Try(
+// 1504|      body = $1,
+// 1505|      catch_ = $3,
+// 1506|      catch_all~,
+// 1507|      try_else = None,
+// 1508|      has_try = false,
+// 1509|      try_loc = mk_loc($loc($1)),
+// 1510|      catch_loc~,
+// 1511|      else_loc = Location::{ start: Position::{ fname: "", lnum: 0, bol: 0, cnum: 0 }, end: Position::{ fname: "", lnum: 0, bol: 0, cnum: 0 } },
+// 1512|      loc = mk_loc($sloc)
+// 1513|    )
+// 1514|  }
+
+///|
+fn yy_action_505(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -17780,10 +18459,10 @@ fn yy_action_493(
 }
 
 // file:///./parser.mbty
-// 224|    X option(SEMI) { @list.singleton($1) }
+// 229|    X option(SEMI) { @list.singleton($1) }
 
 ///|
-fn yy_action_494(
+fn yy_action_506(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -17797,12 +18476,12 @@ fn yy_action_494(
 }
 
 // file:///./parser.mbty
-// 1218|    pattern option(preceded("if", infix_expr)) "=>" expr_statement { 
-// 1219|    Case::{ pattern : $1, guard_ : $2, body : $4 }
-// 1220|  }
+// 1227|    pattern option(preceded("if", infix_expr)) "=>" expr_statement { 
+// 1228|    Case::{ pattern : $1, guard_ : $2, body : $4 }
+// 1229|  }
 
 ///|
-fn yy_action_495(
+fn yy_action_507(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -17818,12 +18497,12 @@ fn yy_action_495(
 }
 
 // file:///./parser.mbty
-// 1323|    lexmatch_header list_semis(lex_case) "}" {
-// 1324|    LexMatch(strategy=$1.1, expr=$1.0, match_loc=mk_loc($loc($1)), cases=$2, loc=mk_loc($sloc))
-// 1325|  }
+// 1332|    lexmatch_header list_semis(lex_case) "}" {
+// 1333|    LexMatch(strategy=$1.1, expr=$1.0, match_loc=mk_loc($loc($1)), cases=$2, loc=mk_loc($sloc))
+// 1334|  }
 
 ///|
-fn yy_action_496(
+fn yy_action_508(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -17852,10 +18531,10 @@ fn yy_action_496(
 }
 
 // file:///./parser.mbty
-// 235|    non_empty_list_semis(X) { $1 }
+// 240|    non_empty_list_semis(X) { $1 }
 
 ///|
-fn yy_action_497(
+fn yy_action_509(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -17869,13 +18548,45 @@ fn yy_action_497(
 }
 
 // file:///./parser.mbty
-// 1186|    "break" POST_LABEL option(expr) { 
-// 1187|    let label = Label::{ name: $2, loc: mk_loc($loc($2)) }
-// 1188|    Break(arg = $3, label = Some(label), loc = mk_loc($sloc))
-// 1189|  }
+// 1345|    lex_pattern "=>" expr_statement {
+// 1346|    LexCase::{
+// 1347|      pat : $1,
+// 1348|      pat_loc : mk_loc($loc($1)),
+// 1349|      guard_ : None,
+// 1350|      body : $3
+// 1351|    }
+// 1352|  }
 
 ///|
-fn yy_action_498(
+fn yy_action_510(
+  _last_pos : Position,
+  _args : ArrayView[(YYObj, Position, Position)],
+) -> YYObj {
+  guard _args[0].0 is YYObj__list_List_LexTopPattern_(_dollar1)
+  let _start_pos_of_item0 = _args[0].1
+  let _end_pos_of_item0 = _args[0].2
+  guard _args[2].0 is YYObj_Expr(_dollar3)
+  YYObj_LexCase(
+    {
+      ()
+      LexCase::{
+        pat: _dollar1,
+        pat_loc: mk_loc((_start_pos_of_item0, _end_pos_of_item0)),
+        guard_: None,
+        body: _dollar3,
+      }
+    },
+  )
+}
+
+// file:///./parser.mbty
+// 1195|    "break" POST_LABEL option(expr) { 
+// 1196|    let label = Label::{ name: $2, loc: mk_loc($loc($2)) }
+// 1197|    Break(arg = $3, label = Some(label), loc = mk_loc($sloc))
+// 1198|  }
+
+///|
+fn yy_action_511(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -17906,10 +18617,10 @@ fn yy_action_498(
 }
 
 // file:///./parser.mbty
-// 1190|    "break" option(expr) { Break(arg = $2, label = None, loc = mk_loc($sloc)) }
+// 1199|    "break" option(expr) { Break(arg = $2, label = None, loc = mk_loc($sloc)) }
 
 ///|
-fn yy_action_499(
+fn yy_action_512(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -17929,13 +18640,13 @@ fn yy_action_499(
 }
 
 // file:///./parser.mbty
-// 1191|    "continue" POST_LABEL list_commas_no_trailing(expr) { 
-// 1192|    let label = Label::{ name: $2, loc: mk_loc($loc($2)) }
-// 1193|    Continue(args = $3, label = Some(label), loc = mk_loc($sloc))
-// 1194|  }
+// 1200|    "continue" POST_LABEL list_commas_no_trailing(expr) { 
+// 1201|    let label = Label::{ name: $2, loc: mk_loc($loc($2)) }
+// 1202|    Continue(args = $3, label = Some(label), loc = mk_loc($sloc))
+// 1203|  }
 
 ///|
-fn yy_action_500(
+fn yy_action_513(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -17966,10 +18677,10 @@ fn yy_action_500(
 }
 
 // file:///./parser.mbty
-// 1195|    "continue" list_commas_no_trailing(expr) { Continue(args = $2, label = None, loc = mk_loc($sloc)) }
+// 1204|    "continue" list_commas_no_trailing(expr) { Continue(args = $2, label = None, loc = mk_loc($sloc)) }
 
 ///|
-fn yy_action_501(
+fn yy_action_514(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -17993,10 +18704,10 @@ fn yy_action_501(
 }
 
 // file:///./parser.mbty
-// 196|    non_empty_list_commas_no_trailing(X) { $1 }
+// 201|    non_empty_list_commas_no_trailing(X) { $1 }
 
 ///|
-fn yy_action_502(
+fn yy_action_515(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -18010,10 +18721,10 @@ fn yy_action_502(
 }
 
 // file:///./parser.mbty
-// 174|    non_empty_list_commas_rev(X) "," X { $1.add($3) }
+// 179|    non_empty_list_commas_rev(X) "," X { $1.add($3) }
 
 ///|
-fn yy_action_503(
+fn yy_action_516(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -18028,10 +18739,10 @@ fn yy_action_503(
 }
 
 // file:///./parser.mbty
-// 178|    non_empty_list_commas_rev(X) { $1.rev() }
+// 183|    non_empty_list_commas_rev(X) { $1.rev() }
 
 ///|
-fn yy_action_504(
+fn yy_action_517(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -18045,10 +18756,10 @@ fn yy_action_504(
 }
 
 // file:///./parser.mbty
-// 173|    X { @list.singleton($1) }
+// 178|    X { @list.singleton($1) }
 
 ///|
-fn yy_action_505(
+fn yy_action_518(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -18062,10 +18773,10 @@ fn yy_action_505(
 }
 
 // file:///./parser.mbty
-// 195|    { @list.empty() }
+// 200|    { @list.empty() }
 
 ///|
-fn yy_action_506(
+fn yy_action_519(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -18078,10 +18789,10 @@ fn yy_action_506(
 }
 
 // file:///./parser.mbty
-// 1196|    "return" option(expr) { Return(return_value = $2, loc = mk_loc($sloc)) }
+// 1205|    "return" option(expr) { Return(return_value = $2, loc = mk_loc($sloc)) }
 
 ///|
-fn yy_action_507(
+fn yy_action_520(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -18104,7 +18815,7 @@ fn yy_action_507(
 // 5|    X { Some($1) }
 
 ///|
-fn yy_action_508(
+fn yy_action_521(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -18121,7 +18832,7 @@ fn yy_action_508(
 // 4|    { None }
 
 ///|
-fn yy_action_509(
+fn yy_action_522(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -18134,10 +18845,10 @@ fn yy_action_509(
 }
 
 // file:///./parser.mbty
-// 1197|    expr_statement_no_break_continue_return { $1 }
+// 1206|    expr_statement_no_break_continue_return { $1 }
 
 ///|
-fn yy_action_510(
+fn yy_action_523(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -18151,18 +18862,18 @@ fn yy_action_510(
 }
 
 // file:///./parser.mbty
-// 1206|    loop_label_colon "while" infix_expr block_expr optional_else { 
-// 1207|    While(
-// 1208|      loop_cond = $3,
-// 1209|      loop_body = $4,
-// 1210|      while_else = $5,
-// 1211|      label = $1,
-// 1212|      loc = mk_loc($sloc)
-// 1213|    )
-// 1214|  }
+// 1215|    loop_label_colon "while" infix_expr block_expr optional_else { 
+// 1216|    While(
+// 1217|      loop_cond = $3,
+// 1218|      loop_body = $4,
+// 1219|      while_else = $5,
+// 1220|      label = $1,
+// 1221|      loc = mk_loc($sloc)
+// 1222|    )
+// 1223|  }
 
 ///|
-fn yy_action_511(
+fn yy_action_524(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -18191,22 +18902,22 @@ fn yy_action_511(
 }
 
 // file:///./parser.mbty
-// 1397|    loop_label_colon loop_header list_semis(single_pattern_case) "}" { 
-// 1398|    Loop(
-// 1399|      arg = $2,
-// 1400|      body = $3,
-// 1401|      label = $1,
-// 1402|      loop_loc = mk_loc($loc($2)),
-// 1403|      loc = mk_loc($sloc)
-// 1404|    )
-// 1405|  }
+// 1416|    loop_label_colon loop_header list_semis(single_pattern_case) "}" { 
+// 1417|    Loop(
+// 1418|      arg = $2,
+// 1419|      body = $3,
+// 1420|      label = $1,
+// 1421|      loop_loc = mk_loc($loc($2)),
+// 1422|      loc = mk_loc($sloc)
+// 1423|    )
+// 1424|  }
 
 ///|
-fn yy_action_512(
+fn yy_action_525(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_513(_args[0].2, _args[1:4])
+  let _sub_action_0_result = yy_action_526(_args[0].2, _args[1:4])
   guard _sub_action_0_result is YYObj_Expr(_dollar2)
   guard _args[4].0 is YYObj_List_Case_(_dollar3)
   guard _args[0].0 is YYObj_Label_(_dollar1)
@@ -18233,10 +18944,10 @@ fn yy_action_512(
 }
 
 // file:///./parser.mbty
-// 1319|    "loop" infix_expr "{" { $2 }
+// 1328|    "loop" infix_expr "{" { $2 }
 
 ///|
-fn yy_action_513(
+fn yy_action_526(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -18250,10 +18961,10 @@ fn yy_action_513(
 }
 
 // file:///./parser.mbty
-// 1409|    list_commas_no_trailing(separated_pair(binder, "=", expr)) { $1 }
+// 1428|    list_commas_no_trailing(separated_pair(binder, "=", expr)) { $1 }
 
 ///|
-fn yy_action_514(
+fn yy_action_527(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -18267,21 +18978,21 @@ fn yy_action_514(
 }
 
 // file:///./parser.mbty
-// 1424|    loop_label_colon "for" for_binders SEMI option(infix_expr) SEMI list_commas_no_trailing(separated_pair(binder, "=", expr)) block_expr optional_else optional_where_clause {
-// 1425|    For(
-// 1426|      binders = $3,
-// 1427|      condition = $5,
-// 1428|      continue_block = $7,
-// 1429|      body = $8,
-// 1430|      for_else = $9,
-// 1431|      label = $1,
-// 1432|      loc = mk_loc($sloc),
-// 1433|      where_clause = $10
-// 1434|    )
-// 1435|  }
+// 1443|    loop_label_colon "for" for_binders SEMI option(infix_expr) SEMI list_commas_no_trailing(separated_pair(binder, "=", expr)) block_expr optional_else optional_where_clause {
+// 1444|    For(
+// 1445|      binders = $3,
+// 1446|      condition = $5,
+// 1447|      continue_block = $7,
+// 1448|      body = $8,
+// 1449|      for_else = $9,
+// 1450|      label = $1,
+// 1451|      loc = mk_loc($sloc),
+// 1452|      where_clause = $10
+// 1453|    )
+// 1454|  }
 
 ///|
-fn yy_action_515(
+fn yy_action_528(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -18319,7 +19030,7 @@ fn yy_action_515(
 // 5|    X { Some($1) }
 
 ///|
-fn yy_action_516(
+fn yy_action_529(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -18336,7 +19047,7 @@ fn yy_action_516(
 // 4|    { None }
 
 ///|
-fn yy_action_517(
+fn yy_action_530(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -18349,12 +19060,12 @@ fn yy_action_517(
 }
 
 // file:///./parser.mbty
-// 1418|    "where" "{" list_commas(labeled_expr) "}" {
-// 1419|    Some({ fields : $3, loc : mk_loc($sloc) })
-// 1420|  }
+// 1437|    "where" "{" list_commas(labeled_expr) "}" {
+// 1438|    Some({ fields : $3, loc : mk_loc($sloc) })
+// 1439|  }
 
 ///|
-fn yy_action_518(
+fn yy_action_531(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -18374,10 +19085,10 @@ fn yy_action_518(
 }
 
 // file:///./parser.mbty
-// 191|    non_empty_list_commas(X) { $1 }
+// 196|    non_empty_list_commas(X) { $1 }
 
 ///|
-fn yy_action_519(
+fn yy_action_532(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -18391,14 +19102,14 @@ fn yy_action_519(
 }
 
 // file:///./parser.mbty
-// 174|    non_empty_list_commas_rev(X) "," X { $1.add($3) }
+// 179|    non_empty_list_commas_rev(X) "," X { $1.add($3) }
 
 ///|
-fn yy_action_520(
+fn yy_action_533(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_398(_args[1].2, _args[2:5])
+  let _sub_action_0_result = yy_action_408(_args[1].2, _args[2:5])
   guard _args[0].0 is YYObj_List_FieldDef_(_dollar1)
   guard _sub_action_0_result is YYObj_FieldDef(_dollar3)
   YYObj_List_FieldDef_(
@@ -18410,10 +19121,10 @@ fn yy_action_520(
 }
 
 // file:///./parser.mbty
-// 182|    non_empty_list_commas_rev(X) option(",") { $1.rev() }
+// 187|    non_empty_list_commas_rev(X) option(",") { $1.rev() }
 
 ///|
-fn yy_action_521(
+fn yy_action_534(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -18427,14 +19138,14 @@ fn yy_action_521(
 }
 
 // file:///./parser.mbty
-// 173|    X { @list.singleton($1) }
+// 178|    X { @list.singleton($1) }
 
 ///|
-fn yy_action_522(
+fn yy_action_535(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_398(_last_pos, _args[0:3])
+  let _sub_action_0_result = yy_action_408(_last_pos, _args[0:3])
   guard _sub_action_0_result is YYObj_FieldDef(_dollar1)
   YYObj_List_FieldDef_(
     {
@@ -18445,10 +19156,10 @@ fn yy_action_522(
 }
 
 // file:///./parser.mbty
-// 190|    { @list.empty() }
+// 195|    { @list.empty() }
 
 ///|
-fn yy_action_523(
+fn yy_action_536(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -18461,21 +19172,21 @@ fn yy_action_523(
 }
 
 // file:///./parser.mbty
-// 1436|    loop_label_colon "for" for_binders block_expr optional_else optional_where_clause {
-// 1437|    For(
-// 1438|      binders = $3,
-// 1439|      condition = None,
-// 1440|      continue_block = @list.empty(),
-// 1441|      body = $4,
-// 1442|      for_else = $5,
-// 1443|      label = $1,
-// 1444|      loc = mk_loc($sloc),
-// 1445|      where_clause = $6
-// 1446|    )
-// 1447|  }
+// 1455|    loop_label_colon "for" for_binders block_expr optional_else optional_where_clause {
+// 1456|    For(
+// 1457|      binders = $3,
+// 1458|      condition = None,
+// 1459|      continue_block = @list.empty(),
+// 1460|      body = $4,
+// 1461|      for_else = $5,
+// 1462|      label = $1,
+// 1463|      loc = mk_loc($sloc),
+// 1464|      where_clause = $6
+// 1465|    )
+// 1466|  }
 
 ///|
-fn yy_action_524(
+fn yy_action_537(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -18508,10 +19219,10 @@ fn yy_action_524(
 }
 
 // file:///./parser.mbty
-// 1421|    { None }
+// 1440|    { None }
 
 ///|
-fn yy_action_525(
+fn yy_action_538(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -18524,10 +19235,10 @@ fn yy_action_525(
 }
 
 // file:///./parser.mbty
-// 1413|    "else" block_expr { Some($2) }
+// 1432|    "else" block_expr { Some($2) }
 
 ///|
-fn yy_action_526(
+fn yy_action_539(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -18541,19 +19252,19 @@ fn yy_action_526(
 }
 
 // file:///./parser.mbty
-// 1451|    loop_label_colon "for" non_empty_list_commas(foreach_binder) "in" expr block_expr optional_else { 
-// 1452|    ForEach(
-// 1453|      binders = $3,
-// 1454|      expr = $5,
-// 1455|      body = $6,
-// 1456|      else_block = $7,
-// 1457|      label = $1,
-// 1458|      loc = mk_loc($sloc)
-// 1459|    )
-// 1460|  }
+// 1470|    loop_label_colon "for" non_empty_list_commas(foreach_binder) "in" expr block_expr optional_else { 
+// 1471|    ForEach(
+// 1472|      binders = $3,
+// 1473|      expr = $5,
+// 1474|      body = $6,
+// 1475|      else_block = $7,
+// 1476|      label = $1,
+// 1477|      loc = mk_loc($sloc)
+// 1478|    )
+// 1479|  }
 
 ///|
-fn yy_action_527(
+fn yy_action_540(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -18584,10 +19295,10 @@ fn yy_action_527(
 }
 
 // file:///./parser.mbty
-// 1414|     { None }
+// 1433|     { None }
 
 ///|
-fn yy_action_528(
+fn yy_action_541(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -18600,14 +19311,14 @@ fn yy_action_528(
 }
 
 // file:///./parser.mbty
-// 173|    X { @list.singleton($1) }
+// 178|    X { @list.singleton($1) }
 
 ///|
-fn yy_action_529(
+fn yy_action_542(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_530(_last_pos, _args[0:3])
+  let _sub_action_0_result = yy_action_543(_last_pos, _args[0:3])
   guard _sub_action_0_result is YYObj__Binder__Expr_(_dollar1)
   YYObj_List__Binder__Expr__(
     {
@@ -18618,10 +19329,10 @@ fn yy_action_529(
 }
 
 // file:///./parser.mbty
-// 196|    non_empty_list_commas_no_trailing(X) { $1 }
+// 201|    non_empty_list_commas_no_trailing(X) { $1 }
 
 ///|
-fn yy_action_531(
+fn yy_action_544(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -18635,10 +19346,10 @@ fn yy_action_531(
 }
 
 // file:///./parser.mbty
-// 182|    non_empty_list_commas_rev(X) option(",") { $1.rev() }
+// 187|    non_empty_list_commas_rev(X) option(",") { $1.rev() }
 
 ///|
-fn yy_action_532(
+fn yy_action_545(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -18652,10 +19363,10 @@ fn yy_action_532(
 }
 
 // file:///./parser.mbty
-// 1464|    binder { Some($1)}
+// 1483|    binder { Some($1)}
 
 ///|
-fn yy_action_533(
+fn yy_action_546(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -18670,10 +19381,10 @@ fn yy_action_533(
 }
 
 // file:///./parser.mbty
-// 1465|    "_" { None }
+// 1484|    "_" { None }
 
 ///|
-fn yy_action_534(
+fn yy_action_547(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -18686,10 +19397,10 @@ fn yy_action_534(
 }
 
 // file:///./parser.mbty
-// 174|    non_empty_list_commas_rev(X) "," X { $1.add($3) }
+// 179|    non_empty_list_commas_rev(X) "," X { $1.add($3) }
 
 ///|
-fn yy_action_535(
+fn yy_action_548(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -18704,10 +19415,10 @@ fn yy_action_535(
 }
 
 // file:///./parser.mbty
-// 1075|    LIDENT { Ident(name = $1) }
+// 1084|    LIDENT { Ident(name = $1) }
 
 ///|
-fn yy_action_536(
+fn yy_action_549(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -18721,10 +19432,10 @@ fn yy_action_536(
 }
 
 // file:///./parser.mbty
-// 1076|    PACKAGE_NAME DOT_LIDENT { Dot(pkg = $1, id = $2) }
+// 1085|    PACKAGE_NAME DOT_LIDENT { Dot(pkg = $1, id = $2) }
 
 ///|
-fn yy_action_537(
+fn yy_action_550(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -18739,10 +19450,10 @@ fn yy_action_537(
 }
 
 // file:///./parser.mbty
-// 1178|    "raise" expr { Raise(err_value = $2, loc = mk_loc($sloc)) }
+// 1187|    "raise" expr { Raise(err_value = $2, loc = mk_loc($sloc)) }
 
 ///|
-fn yy_action_538(
+fn yy_action_551(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -18762,10 +19473,10 @@ fn yy_action_538(
 }
 
 // file:///./parser.mbty
-// 1179|    "..." { Hole(loc = mk_loc($sloc), kind = Todo) }
+// 1188|    "..." { Hole(loc = mk_loc($sloc), kind = Todo) }
 
 ///|
-fn yy_action_539(
+fn yy_action_552(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -18784,14 +19495,14 @@ fn yy_action_539(
 }
 
 // file:///./parser.mbty
-// 1180|    augmented_assignment_expr { $1 }
+// 1189|    augmented_assignment_expr { $1 }
 
 ///|
-fn yy_action_540(
+fn yy_action_553(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_541(_last_pos, _args[0:3])
+  let _sub_action_0_result = yy_action_554(_last_pos, _args[0:3])
   guard _sub_action_0_result is YYObj_Expr(_dollar1)
   YYObj_Expr(
     {
@@ -18802,21 +19513,21 @@ fn yy_action_540(
 }
 
 // file:///./parser.mbty
-// 1167|    left_value assignop expr { 
-// 1168|    let loc = mk_loc($sloc)
-// 1169|    match $1 {
-// 1170|      Var(var_) => Assign(var_~, expr=$3, augmented_by=Some($2), loc~)
-// 1171|      Field(record, accessor) => Mutate(record~, accessor~, field=$3, augmented_by=Some($2), loc~)
-// 1172|      Array(array, index) => ArrayAugmentedSet(op=$2, array~, index~, value=$3, loc~)
-// 1173|    }
-// 1174|  }
+// 1176|    left_value assignop expr { 
+// 1177|    let loc = mk_loc($sloc)
+// 1178|    match $1 {
+// 1179|      Var(var_) => Assign(var_~, expr=$3, augmented_by=Some($2), loc~)
+// 1180|      Field(record, accessor) => Mutate(record~, accessor~, field=$3, augmented_by=Some($2), loc~)
+// 1181|      Array(array, index) => ArrayAugmentedSet(op=$2, array~, index~, value=$3, loc~)
+// 1182|    }
+// 1183|  }
 
 ///|
-fn yy_action_541(
+fn yy_action_554(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_542(_args[0].2, _args[1:2])
+  let _sub_action_0_result = yy_action_555(_args[0].2, _args[1:2])
   let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
   let _end_pos = if _args.length() == 0 {
     _last_pos
@@ -18849,10 +19560,10 @@ fn yy_action_541(
 }
 
 // file:///./parser.mbty
-// 1893|    AUGMENTED_ASSIGNMENT { Var::{ name: Ident(name = $1), loc: mk_loc($sloc) } }
+// 1927|    AUGMENTED_ASSIGNMENT { Var::{ name: Ident(name = $1), loc: mk_loc($sloc) } }
 
 ///|
-fn yy_action_542(
+fn yy_action_555(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -18875,14 +19586,14 @@ fn yy_action_542(
 }
 
 // file:///./parser.mbty
-// 1181|    assignment_expr { $1 }
+// 1190|    assignment_expr { $1 }
 
 ///|
-fn yy_action_543(
+fn yy_action_556(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_544(_last_pos, _args[0:3])
+  let _sub_action_0_result = yy_action_557(_last_pos, _args[0:3])
   guard _sub_action_0_result is YYObj_Expr(_dollar1)
   YYObj_Expr(
     {
@@ -18893,17 +19604,17 @@ fn yy_action_543(
 }
 
 // file:///./parser.mbty
-// 1156|    left_value "=" expr { 
-// 1157|    let loc = mk_loc($sloc)
-// 1158|    match $1 {
-// 1159|      Var(var_) => Assign(var_~, expr=$3, augmented_by=None, loc~)
-// 1160|      Field(record, accessor) => Mutate(record~, accessor~, field=$3, augmented_by=None, loc~)
-// 1161|      Array(array, index) => ArraySet(array~, index~, value=$3, loc~)
-// 1162|    }
-// 1163|  }
+// 1165|    left_value "=" expr { 
+// 1166|    let loc = mk_loc($sloc)
+// 1167|    match $1 {
+// 1168|      Var(var_) => Assign(var_~, expr=$3, augmented_by=None, loc~)
+// 1169|      Field(record, accessor) => Mutate(record~, accessor~, field=$3, augmented_by=None, loc~)
+// 1170|      Array(array, index) => ArraySet(array~, index~, value=$3, loc~)
+// 1171|    }
+// 1172|  }
 
 ///|
-fn yy_action_544(
+fn yy_action_557(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -18930,10 +19641,10 @@ fn yy_action_544(
 }
 
 // file:///./parser.mbty
-// 1182|    expr { $1 }
+// 1191|    expr { $1 }
 
 ///|
-fn yy_action_545(
+fn yy_action_558(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -18947,12 +19658,12 @@ fn yy_action_545(
 }
 
 // file:///./parser.mbty
-// 1506|    binder "=>" expr_statement_no_break_continue_return { 
-// 1507|    make_arrow_fn(@list.singleton((Named($1), None)), $3, params_loc = mk_loc($loc($1)), loc = mk_loc($sloc))
-// 1508|  }
+// 1540|    binder "=>" expr_statement_no_break_continue_return { 
+// 1541|    make_arrow_fn(@list.singleton((Named($1), None)), $3, params_loc = mk_loc($loc($1)), loc = mk_loc($sloc))
+// 1542|  }
 
 ///|
-fn yy_action_546(
+fn yy_action_559(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -18981,10 +19692,10 @@ fn yy_action_546(
 }
 
 // file:///./parser.mbty
-// 1201|    POST_LABEL ":" { Some(Label::{ name : $1, loc : mk_loc($sloc) }) }
+// 1210|    POST_LABEL ":" { Some(Label::{ name : $1, loc : mk_loc($sloc) }) }
 
 ///|
-fn yy_action_547(
+fn yy_action_560(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -19004,14 +19715,14 @@ fn yy_action_547(
 }
 
 // file:///./parser.mbty
-// 174|    non_empty_list_commas_rev(X) "," X { $1.add($3) }
+// 179|    non_empty_list_commas_rev(X) "," X { $1.add($3) }
 
 ///|
-fn yy_action_548(
+fn yy_action_561(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_530(_args[1].2, _args[2:5])
+  let _sub_action_0_result = yy_action_543(_args[1].2, _args[2:5])
   guard _args[0].0 is YYObj_List__Binder__Expr__(_dollar1)
   guard _sub_action_0_result is YYObj__Binder__Expr_(_dollar3)
   YYObj_List__Binder__Expr__(
@@ -19026,7 +19737,7 @@ fn yy_action_548(
 // 28|    X SEP Y { ($1, $3) }
 
 ///|
-fn yy_action_530(
+fn yy_action_543(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -19042,10 +19753,10 @@ fn yy_action_530(
 }
 
 // file:///./parser.mbty
-// 178|    non_empty_list_commas_rev(X) { $1.rev() }
+// 183|    non_empty_list_commas_rev(X) { $1.rev() }
 
 ///|
-fn yy_action_549(
+fn yy_action_562(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -19059,10 +19770,10 @@ fn yy_action_549(
 }
 
 // file:///./parser.mbty
-// 173|    X { @list.singleton($1) }
+// 178|    X { @list.singleton($1) }
 
 ///|
-fn yy_action_550(
+fn yy_action_563(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -19076,10 +19787,10 @@ fn yy_action_550(
 }
 
 // file:///./parser.mbty
-// 195|    { @list.empty() }
+// 200|    { @list.empty() }
 
 ///|
-fn yy_action_551(
+fn yy_action_564(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -19092,10 +19803,10 @@ fn yy_action_551(
 }
 
 // file:///./parser.mbty
-// 1235|    "catch" "{" { (false, mk_loc($sloc)) }
+// 1244|    "catch" "{" { (false, mk_loc($sloc)) }
 
 ///|
-fn yy_action_552(
+fn yy_action_565(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -19114,10 +19825,10 @@ fn yy_action_552(
 }
 
 // file:///./parser.mbty
-// 1236|    "catch" "!" "{" { (true, mk_loc($sloc)) }
+// 1245|    "catch" "!" "{" { (true, mk_loc($sloc)) }
 
 ///|
-fn yy_action_553(
+fn yy_action_566(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -19136,10 +19847,10 @@ fn yy_action_553(
 }
 
 // file:///./parser.mbty
-// 1231|    list_semis(single_pattern_case) { $1 }
+// 1240|    list_semis(single_pattern_case) { $1 }
 
 ///|
-fn yy_action_554(
+fn yy_action_567(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -19153,28 +19864,28 @@ fn yy_action_554(
 }
 
 // file:///./parser.mbty
-// 1258|    "try" pipe_expr catch_keyword single_pattern_cases "}" else_keyword single_pattern_cases "}" { 
-// 1259|    let (catch_all, catch_loc) = $3
-// 1260|    let else_loc = $6
-// 1261|    Try(
-// 1262|      body = $2,
-// 1263|      catch_ = $4,
-// 1264|      catch_all~,
-// 1265|      try_else = Some($7),
-// 1266|      has_try = true,
-// 1267|      try_loc = mk_loc($loc($1)),
-// 1268|      catch_loc~,
-// 1269|      else_loc~,
-// 1270|      loc = mk_loc($sloc)
-// 1271|    )
-// 1272|  }
+// 1267|    "try" pipe_expr catch_keyword single_pattern_cases "}" else_keyword single_pattern_cases "}" { 
+// 1268|    let (catch_all, catch_loc) = $3
+// 1269|    let else_loc = $6
+// 1270|    Try(
+// 1271|      body = $2,
+// 1272|      catch_ = $4,
+// 1273|      catch_all~,
+// 1274|      try_else = Some($7),
+// 1275|      has_try = true,
+// 1276|      try_loc = mk_loc($loc($1)),
+// 1277|      catch_loc~,
+// 1278|      else_loc~,
+// 1279|      loc = mk_loc($sloc)
+// 1280|    )
+// 1281|  }
 
 ///|
-fn yy_action_555(
+fn yy_action_568(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_556(_args[4].2, _args[5:7])
+  let _sub_action_0_result = yy_action_504(_args[4].2, _args[5:7])
   guard _args[2].0 is YYObj__Bool__Location_(_dollar3)
   guard _sub_action_0_result is YYObj_Location(_dollar6)
   guard _args[1].0 is YYObj_Expr(_dollar2)
@@ -19209,10 +19920,10 @@ fn yy_action_555(
 }
 
 // file:///./parser.mbty
-// 1240|    "noraise" "{" { mk_loc($sloc) }
+// 1249|    "noraise" "{" { mk_loc($sloc) }
 
 ///|
-fn yy_action_556(
+fn yy_action_504(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -19231,23 +19942,23 @@ fn yy_action_556(
 }
 
 // file:///./parser.mbty
-// 1244|    "try" pipe_expr catch_keyword single_pattern_cases "}" { 
-// 1245|    let (catch_all, catch_loc) = $3
-// 1246|    Try(
-// 1247|      body = $2,
-// 1248|      catch_ = $4,
-// 1249|      catch_all~,
-// 1250|      try_else = None,
-// 1251|      has_try = true,
-// 1252|      try_loc = mk_loc($loc($1)),
-// 1253|      catch_loc~,
-// 1254|      else_loc = @basic.Location::{ start: @basic.Position::{ fname: "", lnum: 0, bol: 0, cnum: 0 }, end: @basic.Position::{ fname: "", lnum: 0, bol: 0, cnum: 0 } },
-// 1255|      loc = mk_loc($sloc)
-// 1256|    )
-// 1257|  }
+// 1253|    "try" pipe_expr catch_keyword single_pattern_cases "}" { 
+// 1254|    let (catch_all, catch_loc) = $3
+// 1255|    Try(
+// 1256|      body = $2,
+// 1257|      catch_ = $4,
+// 1258|      catch_all~,
+// 1259|      try_else = None,
+// 1260|      has_try = true,
+// 1261|      try_loc = mk_loc($loc($1)),
+// 1262|      catch_loc~,
+// 1263|      else_loc = @basic.Location::{ start: @basic.Position::{ fname: "", lnum: 0, bol: 0, cnum: 0 }, end: @basic.Position::{ fname: "", lnum: 0, bol: 0, cnum: 0 } },
+// 1264|      loc = mk_loc($sloc)
+// 1265|    )
+// 1266|  }
 
 ///|
-fn yy_action_557(
+fn yy_action_569(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -19285,10 +19996,10 @@ fn yy_action_557(
 }
 
 // file:///./parser.mbty
-// 235|    non_empty_list_semis(X) { $1 }
+// 240|    non_empty_list_semis(X) { $1 }
 
 ///|
-fn yy_action_558(
+fn yy_action_570(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -19302,12 +20013,12 @@ fn yy_action_558(
 }
 
 // file:///./parser.mbty
-// 1273|    "try?" pipe_expr { 
-// 1274|    TryOperator(body = $2, kind = Question, try_loc = mk_loc($loc($1)), loc = mk_loc($sloc))
-// 1275|  }
+// 1282|    "try?" pipe_expr { 
+// 1283|    TryOperator(body = $2, kind = Question, try_loc = mk_loc($loc($1)), loc = mk_loc($sloc))
+// 1284|  }
 
 ///|
-fn yy_action_559(
+fn yy_action_571(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -19334,12 +20045,12 @@ fn yy_action_559(
 }
 
 // file:///./parser.mbty
-// 1276|    "try!" pipe_expr {
-// 1277|    TryOperator(body = $2, kind = Exclamation, try_loc = mk_loc($loc($1)), loc = mk_loc($sloc))
-// 1278|  }
+// 1285|    "try!" pipe_expr {
+// 1286|    TryOperator(body = $2, kind = Exclamation, try_loc = mk_loc($loc($1)), loc = mk_loc($sloc))
+// 1287|  }
 
 ///|
-fn yy_action_560(
+fn yy_action_572(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -19366,12 +20077,12 @@ fn yy_action_560(
 }
 
 // file:///./parser.mbty
-// 1282|    "if" infix_expr block_expr "else" block_expr { 
-// 1283|    If(cond = $2, ifso = $3, ifnot = Some($5), loc = mk_loc($sloc))
-// 1284|  }
+// 1291|    "if" infix_expr block_expr "else" block_expr { 
+// 1292|    If(cond = $2, ifso = $3, ifnot = Some($5), loc = mk_loc($sloc))
+// 1293|  }
 
 ///|
-fn yy_action_561(
+fn yy_action_573(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -19398,12 +20109,12 @@ fn yy_action_561(
 }
 
 // file:///./parser.mbty
-// 1285|    "if" infix_expr block_expr "else" if_expr { 
-// 1286|    If(cond = $2, ifso = $3, ifnot = Some($5), loc = mk_loc($sloc))
-// 1287|  }
+// 1294|    "if" infix_expr block_expr "else" if_expr { 
+// 1295|    If(cond = $2, ifso = $3, ifnot = Some($5), loc = mk_loc($sloc))
+// 1296|  }
 
 ///|
-fn yy_action_562(
+fn yy_action_574(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -19430,12 +20141,12 @@ fn yy_action_562(
 }
 
 // file:///./parser.mbty
-// 1288|    "if" infix_expr block_expr { 
-// 1289|    If(cond = $2, ifso = $3, ifnot = None, loc = mk_loc($sloc))
-// 1290|  }
+// 1297|    "if" infix_expr block_expr { 
+// 1298|    If(cond = $2, ifso = $3, ifnot = None, loc = mk_loc($sloc))
+// 1299|  }
 
 ///|
-fn yy_action_563(
+fn yy_action_575(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -19461,10 +20172,10 @@ fn yy_action_563(
 }
 
 // file:///./parser.mbty
-// 1294|    "match" infix_expr "{" { $2 }
+// 1303|    "match" infix_expr "{" { $2 }
 
 ///|
-fn yy_action_564(
+fn yy_action_576(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -19478,18 +20189,18 @@ fn yy_action_564(
 }
 
 // file:///./parser.mbty
-// 1298|    match_header non_empty_list_semis(single_pattern_case) "}" { 
-// 1299|    let expr = $1
-// 1300|    Match(
-// 1301|      expr~,
-// 1302|      cases = $2,
-// 1303|      match_loc = mk_loc($loc($1)),
-// 1304|      loc = mk_loc($sloc)
-// 1305|    )
-// 1306|  }
+// 1307|    match_header non_empty_list_semis(single_pattern_case) "}" { 
+// 1308|    let expr = $1
+// 1309|    Match(
+// 1310|      expr~,
+// 1311|      cases = $2,
+// 1312|      match_loc = mk_loc($loc($1)),
+// 1313|      loc = mk_loc($sloc)
+// 1314|    )
+// 1315|  }
 
 ///|
-fn yy_action_565(
+fn yy_action_577(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -19518,18 +20229,18 @@ fn yy_action_565(
 }
 
 // file:///./parser.mbty
-// 1307|    match_header "}" { 
-// 1308|    let expr = $1
-// 1309|    Match(
-// 1310|      expr~,
-// 1311|      cases = @list.empty(),
-// 1312|      match_loc = mk_loc($loc($1)),
-// 1313|      loc = mk_loc($sloc)
-// 1314|    )
-// 1315|  }
+// 1316|    match_header "}" { 
+// 1317|    let expr = $1
+// 1318|    Match(
+// 1319|      expr~,
+// 1320|      cases = @list.empty(),
+// 1321|      match_loc = mk_loc($loc($1)),
+// 1322|      loc = mk_loc($sloc)
+// 1323|    )
+// 1324|  }
 
 ///|
-fn yy_action_566(
+fn yy_action_578(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -19557,16 +20268,17 @@ fn yy_action_566(
 }
 
 // file:///./parser.mbty
-// 1336|    lex_pattern "=>" expr_statement {
-// 1337|    LexCase::{
-// 1338|      pat : $1,
-// 1339|      pat_loc : mk_loc($loc($1)),
-// 1340|      body : $3
-// 1341|    }
-// 1342|  }
+// 1353|    lex_pattern "if" infix_expr "=>" expr_statement {
+// 1354|    LexCase::{
+// 1355|      pat : $1,
+// 1356|      pat_loc : mk_loc($loc($1)),
+// 1357|      guard_ : Some($3),
+// 1358|      body : $5
+// 1359|    }
+// 1360|  }
 
 ///|
-fn yy_action_567(
+fn yy_action_579(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -19574,30 +20286,33 @@ fn yy_action_567(
   let _start_pos_of_item0 = _args[0].1
   let _end_pos_of_item0 = _args[0].2
   guard _args[2].0 is YYObj_Expr(_dollar3)
+  guard _args[4].0 is YYObj_Expr(_dollar5)
   YYObj_LexCase(
     {
       ()
       LexCase::{
         pat: _dollar1,
         pat_loc: mk_loc((_start_pos_of_item0, _end_pos_of_item0)),
-        body: _dollar3,
+        guard_: Some(_dollar3),
+        body: _dollar5,
       }
     },
   )
 }
 
 // file:///./parser.mbty
-// 1343|    "..." {
-// 1344|    let pat = @list.singleton(LexTopPattern::Wildcard(loc = mk_loc($sloc)))
-// 1345|    LexCase::{
-// 1346|      pat,
-// 1347|      pat_loc : mk_loc($sloc),
-// 1348|      body : Hole(loc=mk_loc($sloc), kind=Todo)
-// 1349|    }
-// 1350|  }
+// 1361|    "..." {
+// 1362|    let pat = @list.singleton(LexTopPattern::Wildcard(loc = mk_loc($sloc)))
+// 1363|    LexCase::{
+// 1364|      pat,
+// 1365|      pat_loc : mk_loc($sloc),
+// 1366|      guard_ : None,
+// 1367|      body : Hole(loc=mk_loc($sloc), kind=Todo)
+// 1368|    }
+// 1369|  }
 
 ///|
-fn yy_action_568(
+fn yy_action_580(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -19616,6 +20331,7 @@ fn yy_action_568(
       LexCase::{
         pat,
         pat_loc: mk_loc((_symbol_start_pos, _end_pos)),
+        guard_: None,
         body: Hole(loc=mk_loc((_symbol_start_pos, _end_pos)), kind=Todo),
       }
     },
@@ -19623,10 +20339,10 @@ fn yy_action_568(
 }
 
 // file:///./parser.mbty
-// 225|    X SEMI non_empty_list_semis(X) { $3.add($1) }
+// 230|    X SEMI non_empty_list_semis(X) { $3.add($1) }
 
 ///|
-fn yy_action_569(
+fn yy_action_581(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -19641,10 +20357,10 @@ fn yy_action_569(
 }
 
 // file:///./parser.mbty
-// 224|    X option(SEMI) { @list.singleton($1) }
+// 229|    X option(SEMI) { @list.singleton($1) }
 
 ///|
-fn yy_action_570(
+fn yy_action_582(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -19658,10 +20374,10 @@ fn yy_action_570(
 }
 
 // file:///./parser.mbty
-// 234|    { @list.empty() }
+// 239|    { @list.empty() }
 
 ///|
-fn yy_action_571(
+fn yy_action_583(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -19674,12 +20390,12 @@ fn yy_action_571(
 }
 
 // file:///./parser.mbty
-// 1328|    "lexmatch" infix_expr "{" {
-// 1329|    ($2, None)
-// 1330|  }
+// 1337|    "lexmatch" infix_expr "{" {
+// 1338|    ($2, None)
+// 1339|  }
 
 ///|
-fn yy_action_572(
+fn yy_action_584(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -19693,16 +20409,16 @@ fn yy_action_572(
 }
 
 // file:///./parser.mbty
-// 1331|    "lexmatch" infix_expr "with" label "{" {
-// 1332|    ($2, Some($4))
-// 1333|  }
+// 1340|    "lexmatch" infix_expr "with" label "{" {
+// 1341|    ($2, Some($4))
+// 1342|  }
 
 ///|
-fn yy_action_573(
+fn yy_action_585(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_480(_args[2].2, _args[3:4])
+  let _sub_action_0_result = yy_action_490(_args[2].2, _args[3:4])
   guard _args[1].0 is YYObj_Expr(_dollar2)
   guard _sub_action_0_result is YYObj_Label(_dollar4)
   YYObj__Expr__Label__(
@@ -19714,10 +20430,10 @@ fn yy_action_573(
 }
 
 // file:///./parser.mbty
-// 1469|    loop_expr { $1 }
+// 1488|    loop_expr { $1 }
 
 ///|
-fn yy_action_574(
+fn yy_action_586(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -19731,10 +20447,10 @@ fn yy_action_574(
 }
 
 // file:///./parser.mbty
-// 1470|    for_expr { $1 }
+// 1489|    for_expr { $1 }
 
 ///|
-fn yy_action_575(
+fn yy_action_587(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -19748,10 +20464,10 @@ fn yy_action_575(
 }
 
 // file:///./parser.mbty
-// 1471|    foreach_expr { $1 }
+// 1490|    foreach_expr { $1 }
 
 ///|
-fn yy_action_576(
+fn yy_action_588(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -19765,10 +20481,10 @@ fn yy_action_576(
 }
 
 // file:///./parser.mbty
-// 1472|    while_expr { $1 }
+// 1491|    while_expr { $1 }
 
 ///|
-fn yy_action_577(
+fn yy_action_589(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -19782,10 +20498,10 @@ fn yy_action_577(
 }
 
 // file:///./parser.mbty
-// 1473|    try_expr { $1 }
+// 1492|    try_expr { $1 }
 
 ///|
-fn yy_action_578(
+fn yy_action_590(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -19799,10 +20515,10 @@ fn yy_action_578(
 }
 
 // file:///./parser.mbty
-// 1474|    if_expr { $1 }
+// 1493|    if_expr { $1 }
 
 ///|
-fn yy_action_579(
+fn yy_action_591(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -19816,10 +20532,10 @@ fn yy_action_579(
 }
 
 // file:///./parser.mbty
-// 1475|    match_expr { $1 }
+// 1494|    match_expr { $1 }
 
 ///|
-fn yy_action_580(
+fn yy_action_592(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -19833,10 +20549,10 @@ fn yy_action_580(
 }
 
 // file:///./parser.mbty
-// 1476|    lexmatch_expr { $1 }
+// 1495|    lexmatch_expr { $1 }
 
 ///|
-fn yy_action_581(
+fn yy_action_593(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -19850,10 +20566,10 @@ fn yy_action_581(
 }
 
 // file:///./parser.mbty
-// 1477|    simple_try_expr { $1 }
+// 1496|    simple_try_expr { $1 }
 
 ///|
-fn yy_action_582(
+fn yy_action_594(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -19867,10 +20583,10 @@ fn yy_action_582(
 }
 
 // file:///./parser.mbty
-// 1478|    arrow_fn_expr { Function(func = $1, loc = mk_loc($sloc)) }
+// 1497|    arrow_fn_expr { Function(func = $1, loc = mk_loc($sloc)) }
 
 ///|
-fn yy_action_583(
+fn yy_action_595(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -19893,11 +20609,11 @@ fn yy_action_583(
 // 5|    X { Some($1) }
 
 ///|
-fn yy_action_584(
+fn yy_action_596(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_585(_last_pos, _args[0:2])
+  let _sub_action_0_result = yy_action_597(_last_pos, _args[0:2])
   guard _sub_action_0_result is YYObj_Expr(_dollar1)
   YYObj_Option_Expr_(
     {
@@ -19911,7 +20627,7 @@ fn yy_action_584(
 // 32|    L X { $2 }
 
 ///|
-fn yy_action_585(
+fn yy_action_597(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -19928,7 +20644,7 @@ fn yy_action_585(
 // 4|    { None }
 
 ///|
-fn yy_action_586(
+fn yy_action_598(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -19941,16 +20657,16 @@ fn yy_action_586(
 }
 
 // file:///./parser.mbty
-// 1221|    "..." { 
-// 1222|    Case::{ 
-// 1223|      pattern : Pattern::Any(loc = mk_loc($sloc)), 
-// 1224|      guard_ : None, 
-// 1225|      body : Hole(loc = mk_loc($sloc), kind = Todo) 
-// 1226|    }
-// 1227|  }
+// 1230|    "..." { 
+// 1231|    Case::{ 
+// 1232|      pattern : Pattern::Any(loc = mk_loc($sloc)), 
+// 1233|      guard_ : None, 
+// 1234|      body : Hole(loc = mk_loc($sloc), kind = Todo) 
+// 1235|    }
+// 1236|  }
 
 ///|
-fn yy_action_587(
+fn yy_action_599(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -19973,10 +20689,10 @@ fn yy_action_587(
 }
 
 // file:///./parser.mbty
-// 225|    X SEMI non_empty_list_semis(X) { $3.add($1) }
+// 230|    X SEMI non_empty_list_semis(X) { $3.add($1) }
 
 ///|
-fn yy_action_588(
+fn yy_action_600(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -19991,10 +20707,10 @@ fn yy_action_588(
 }
 
 // file:///./parser.mbty
-// 234|    { @list.empty() }
+// 239|    { @list.empty() }
 
 ///|
-fn yy_action_589(
+fn yy_action_601(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -20007,16 +20723,16 @@ fn yy_action_589(
 }
 
 // file:///./parser.mbty
-// 1536|    pipe_expr "|>" binder "=>" block_expr {
-// 1537|    let params_loc = mk_loc($loc($3))
-// 1538|    let fn_loc = mk_loc($loc($3)).merge(mk_loc($loc($5)))
-// 1539|    let func = make_arrow_fn(@list.singleton((Named($3), None)), $5, params_loc~, loc = fn_loc)
-// 1540|    let rhs = Expr::Function(func~, loc = fn_loc)
-// 1541|    Pipe(lhs = $1, rhs~, loc = mk_loc($sloc))
-// 1542|  }
+// 1570|    pipe_expr "|>" binder "=>" block_expr {
+// 1571|    let params_loc = mk_loc($loc($3))
+// 1572|    let fn_loc = mk_loc($loc($3)).merge(mk_loc($loc($5)))
+// 1573|    let func = make_arrow_fn(@list.singleton((Named($3), None)), $5, params_loc~, loc = fn_loc)
+// 1574|    let rhs = Expr::Function(func~, loc = fn_loc)
+// 1575|    Pipe(lhs = $1, rhs~, loc = mk_loc($sloc))
+// 1576|  }
 
 ///|
-fn yy_action_590(
+fn yy_action_602(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -20054,12 +20770,12 @@ fn yy_action_590(
 }
 
 // file:///./parser.mbty
-// 1533|    pipe_expr "|>" infix_expr { 
-// 1534|    Pipe(lhs = $1, rhs = $3, loc = mk_loc($sloc))
-// 1535|  }
+// 1567|    pipe_expr "|>" infix_expr { 
+// 1568|    Pipe(lhs = $1, rhs = $3, loc = mk_loc($sloc))
+// 1569|  }
 
 ///|
-fn yy_action_591(
+fn yy_action_603(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -20084,10 +20800,10 @@ fn yy_action_591(
 }
 
 // file:///./parser.mbty
-// 1496|    pipe_expr { $1 }
+// 1530|    pipe_expr { $1 }
 
 ///|
-fn yy_action_592(
+fn yy_action_604(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -20101,14 +20817,14 @@ fn yy_action_592(
 }
 
 // file:///./parser.mbty
-// 1527|    "_" ioption(",") ")" { @list.singleton(Unnamed(mk_loc($loc($1)))) }
+// 1561|    "_" ioption(",") ")" { @list.singleton(Unnamed(mk_loc($loc($1)))) }
 
 ///|
-fn yy_action_593(
+fn yy_action_605(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_488(_args[0].2, _args[1:1])
+  let _sub_action_0_result = yy_action_498(_args[0].2, _args[1:1])
   let _start_pos_of_item0 = _args[0].1
   let _end_pos_of_item0 = _args[0].2
   YYObj_List_ArrowFnParam_(
@@ -20120,14 +20836,14 @@ fn yy_action_593(
 }
 
 // file:///./parser.mbty
-// 1527|    "_" ioption(",") ")" { @list.singleton(Unnamed(mk_loc($loc($1)))) }
+// 1561|    "_" ioption(",") ")" { @list.singleton(Unnamed(mk_loc($loc($1)))) }
 
 ///|
-fn yy_action_594(
+fn yy_action_606(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_490(_args[0].2, _args[1:2])
+  let _sub_action_0_result = yy_action_500(_args[0].2, _args[1:2])
   let _start_pos_of_item0 = _args[0].1
   let _end_pos_of_item0 = _args[0].2
   YYObj_List_ArrowFnParam_(
@@ -20139,10 +20855,10 @@ fn yy_action_594(
 }
 
 // file:///./parser.mbty
-// 1529|    "_" "," arrow_fn_prefix_no_constraint { $3.add(Unnamed(mk_loc($loc($1)))) }
+// 1563|    "_" "," arrow_fn_prefix_no_constraint { $3.add(Unnamed(mk_loc($loc($1)))) }
 
 ///|
-fn yy_action_595(
+fn yy_action_607(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -20158,10 +20874,10 @@ fn yy_action_595(
 }
 
 // file:///./parser.mbty
-// 1671|    "_" "," non_empty_tuple_elems_with_prefix { $3.add(Expr::Hole(loc = mk_loc($loc($1)), kind = Incomplete)) }
+// 1705|    "_" "," non_empty_tuple_elems_with_prefix { $3.add(Expr::Hole(loc = mk_loc($loc($1)), kind = Incomplete)) }
 
 ///|
-fn yy_action_596(
+fn yy_action_608(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -20182,10 +20898,10 @@ fn yy_action_596(
 }
 
 // file:///./parser.mbty
-// 1695|    "(" "_" ":" type_ ")" { Constraint(expr = Hole(loc = mk_loc($loc($2)), kind = Incomplete), ty = $4, loc = mk_loc($sloc)) }
+// 1729|    "(" "_" ":" type_ ")" { Constraint(expr = Hole(loc = mk_loc($loc($2)), kind = Incomplete), ty = $4, loc = mk_loc($sloc)) }
 
 ///|
-fn yy_action_597(
+fn yy_action_609(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -20214,14 +20930,14 @@ fn yy_action_597(
 }
 
 // file:///./parser.mbty
-// 1516|    "_" ioption(",") ")" { @list.singleton((Unnamed(mk_loc($loc($1))), None)) }
+// 1550|    "_" ioption(",") ")" { @list.singleton((Unnamed(mk_loc($loc($1))), None)) }
 
 ///|
-fn yy_action_598(
+fn yy_action_610(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_488(_args[0].2, _args[1:1])
+  let _sub_action_0_result = yy_action_498(_args[0].2, _args[1:1])
   let _start_pos_of_item0 = _args[0].1
   let _end_pos_of_item0 = _args[0].2
   YYObj_List__ArrowFnParam__Type___(
@@ -20235,15 +20951,15 @@ fn yy_action_598(
 }
 
 // file:///./parser.mbty
-// 1515|    binder ioption(",") ")" { @list.singleton((Named($1), None)) }
+// 1549|    binder ioption(",") ")" { @list.singleton((Named($1), None)) }
 
 ///|
-fn yy_action_599(
+fn yy_action_611(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
   let _sub_action_0_result = yy_action_16(_last_pos, _args[0:1])
-  let _sub_action_1_result = yy_action_488(_args[0].2, _args[1:1])
+  let _sub_action_1_result = yy_action_498(_args[0].2, _args[1:1])
   guard _sub_action_0_result is YYObj_Binder(_dollar1)
   YYObj_List__ArrowFnParam__Type___(
     {
@@ -20254,15 +20970,15 @@ fn yy_action_599(
 }
 
 // file:///./parser.mbty
-// 1515|    binder ioption(",") ")" { @list.singleton((Named($1), None)) }
+// 1549|    binder ioption(",") ")" { @list.singleton((Named($1), None)) }
 
 ///|
-fn yy_action_600(
+fn yy_action_612(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
   let _sub_action_0_result = yy_action_16(_last_pos, _args[0:1])
-  let _sub_action_1_result = yy_action_490(_args[0].2, _args[1:2])
+  let _sub_action_1_result = yy_action_500(_args[0].2, _args[1:2])
   guard _sub_action_0_result is YYObj_Binder(_dollar1)
   YYObj_List__ArrowFnParam__Type___(
     {
@@ -20273,10 +20989,10 @@ fn yy_action_600(
 }
 
 // file:///./parser.mbty
-// 1519|    binder "," arrow_fn_prefix { $3.add((Named($1), None)) }
+// 1553|    binder "," arrow_fn_prefix { $3.add((Named($1), None)) }
 
 ///|
-fn yy_action_601(
+fn yy_action_613(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -20292,15 +21008,15 @@ fn yy_action_601(
 }
 
 // file:///./parser.mbty
-// 1517|    binder ":" type_ ioption(",") ")" { @list.singleton((Named($1), Some($3))) }
+// 1551|    binder ":" type_ ioption(",") ")" { @list.singleton((Named($1), Some($3))) }
 
 ///|
-fn yy_action_602(
+fn yy_action_614(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
   let _sub_action_0_result = yy_action_16(_last_pos, _args[0:1])
-  let _sub_action_1_result = yy_action_488(_args[2].2, _args[3:3])
+  let _sub_action_1_result = yy_action_498(_args[2].2, _args[3:3])
   guard _sub_action_0_result is YYObj_Binder(_dollar1)
   guard _args[2].0 is YYObj_Type(_dollar3)
   YYObj_List__ArrowFnParam__Type___(
@@ -20312,15 +21028,15 @@ fn yy_action_602(
 }
 
 // file:///./parser.mbty
-// 1517|    binder ":" type_ ioption(",") ")" { @list.singleton((Named($1), Some($3))) }
+// 1551|    binder ":" type_ ioption(",") ")" { @list.singleton((Named($1), Some($3))) }
 
 ///|
-fn yy_action_603(
+fn yy_action_615(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
   let _sub_action_0_result = yy_action_16(_last_pos, _args[0:1])
-  let _sub_action_1_result = yy_action_490(_args[2].2, _args[3:4])
+  let _sub_action_1_result = yy_action_500(_args[2].2, _args[3:4])
   guard _sub_action_0_result is YYObj_Binder(_dollar1)
   guard _args[2].0 is YYObj_Type(_dollar3)
   YYObj_List__ArrowFnParam__Type___(
@@ -20332,10 +21048,10 @@ fn yy_action_603(
 }
 
 // file:///./parser.mbty
-// 1521|    binder ":" type_ "," arrow_fn_prefix { $5.add((Named($1), Some($3))) }
+// 1555|    binder ":" type_ "," arrow_fn_prefix { $5.add((Named($1), Some($3))) }
 
 ///|
-fn yy_action_604(
+fn yy_action_616(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -20352,14 +21068,14 @@ fn yy_action_604(
 }
 
 // file:///./parser.mbty
-// 1516|    "_" ioption(",") ")" { @list.singleton((Unnamed(mk_loc($loc($1))), None)) }
+// 1550|    "_" ioption(",") ")" { @list.singleton((Unnamed(mk_loc($loc($1))), None)) }
 
 ///|
-fn yy_action_605(
+fn yy_action_617(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_490(_args[0].2, _args[1:2])
+  let _sub_action_0_result = yy_action_500(_args[0].2, _args[1:2])
   let _start_pos_of_item0 = _args[0].1
   let _end_pos_of_item0 = _args[0].2
   YYObj_List__ArrowFnParam__Type___(
@@ -20373,10 +21089,10 @@ fn yy_action_605(
 }
 
 // file:///./parser.mbty
-// 1520|    "_" "," arrow_fn_prefix { $3.add((Unnamed(mk_loc($loc($1))), None)) }
+// 1554|    "_" "," arrow_fn_prefix { $3.add((Unnamed(mk_loc($loc($1))), None)) }
 
 ///|
-fn yy_action_606(
+fn yy_action_618(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -20394,14 +21110,14 @@ fn yy_action_606(
 }
 
 // file:///./parser.mbty
-// 1518|    "_" ":" type_ ioption(",") ")" { @list.singleton((Unnamed(mk_loc($loc($1))), Some($3))) }
+// 1552|    "_" ":" type_ ioption(",") ")" { @list.singleton((Unnamed(mk_loc($loc($1))), Some($3))) }
 
 ///|
-fn yy_action_607(
+fn yy_action_619(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_488(_args[2].2, _args[3:3])
+  let _sub_action_0_result = yy_action_498(_args[2].2, _args[3:3])
   let _start_pos_of_item0 = _args[0].1
   let _end_pos_of_item0 = _args[0].2
   guard _args[2].0 is YYObj_Type(_dollar3)
@@ -20419,14 +21135,14 @@ fn yy_action_607(
 }
 
 // file:///./parser.mbty
-// 1518|    "_" ":" type_ ioption(",") ")" { @list.singleton((Unnamed(mk_loc($loc($1))), Some($3))) }
+// 1552|    "_" ":" type_ ioption(",") ")" { @list.singleton((Unnamed(mk_loc($loc($1))), Some($3))) }
 
 ///|
-fn yy_action_608(
+fn yy_action_620(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_490(_args[2].2, _args[3:4])
+  let _sub_action_0_result = yy_action_500(_args[2].2, _args[3:4])
   let _start_pos_of_item0 = _args[0].1
   let _end_pos_of_item0 = _args[0].2
   guard _args[2].0 is YYObj_Type(_dollar3)
@@ -20444,10 +21160,10 @@ fn yy_action_608(
 }
 
 // file:///./parser.mbty
-// 1522|    "_" ":" type_ "," arrow_fn_prefix { $5.add((Unnamed(mk_loc($loc($1))), Some($3))) }
+// 1556|    "_" ":" type_ "," arrow_fn_prefix { $5.add((Unnamed(mk_loc($loc($1))), Some($3))) }
 
 ///|
-fn yy_action_609(
+fn yy_action_621(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -20469,16 +21185,16 @@ fn yy_action_609(
 }
 
 // file:///./parser.mbty
-// 1760|    simple_expr apply_attr "(" list_commas(argument) ")" { 
-// 1761|    Apply(func = $1, args = $4, attr = $2, loc = mk_loc($sloc))
-// 1762|  }
+// 1794|    simple_expr apply_attr "(" list_commas(argument) ")" { 
+// 1795|    Apply(func = $1, args = $4, attr = $2, loc = mk_loc($sloc))
+// 1796|  }
 
 ///|
-fn yy_action_610(
+fn yy_action_622(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_461(_args[0].2, _args[1:2])
+  let _sub_action_0_result = yy_action_471(_args[0].2, _args[1:2])
   guard _args[0].0 is YYObj_Expr(_dollar1)
   guard _args[3].0 is YYObj_List_Argument_(_dollar4)
   guard _sub_action_0_result is YYObj_ApplyAttr(_dollar2)
@@ -20502,10 +21218,10 @@ fn yy_action_610(
 }
 
 // file:///./parser.mbty
-// 1661|    "?" { Question }
+// 1695|    "?" { Question }
 
 ///|
-fn yy_action_461(
+fn yy_action_471(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -20518,14 +21234,14 @@ fn yy_action_461(
 }
 
 // file:///./parser.mbty
-// 1629|    var { Var($1) }
+// 1663|    var { Var($1) }
 
 ///|
-fn yy_action_611(
+fn yy_action_623(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_612(_last_pos, _args[0:1])
+  let _sub_action_0_result = yy_action_624(_last_pos, _args[0:1])
   guard _sub_action_0_result is YYObj_Var(_dollar1)
   YYObj_LeftValue(
     {
@@ -20536,10 +21252,10 @@ fn yy_action_611(
 }
 
 // file:///./parser.mbty
-// 1846|    qual_ident { Var::{ name: $1, loc: mk_loc($sloc) } }
+// 1880|    qual_ident { Var::{ name: $1, loc: mk_loc($sloc) } }
 
 ///|
-fn yy_action_612(
+fn yy_action_624(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -20559,16 +21275,16 @@ fn yy_action_612(
 }
 
 // file:///./parser.mbty
-// 1547|    infix_expr infixop infix_expr { 
-// 1548|    Infix(op = $2, lhs = $1, rhs = $3, loc = mk_loc($sloc))
-// 1549|  }
+// 1581|    infix_expr infixop infix_expr { 
+// 1582|    Infix(op = $2, lhs = $1, rhs = $3, loc = mk_loc($sloc))
+// 1583|  }
 
 ///|
-fn yy_action_613(
+fn yy_action_625(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_614(_args[0].2, _args[1:2])
+  let _sub_action_0_result = yy_action_626(_args[0].2, _args[1:2])
   guard _sub_action_0_result is YYObj_Var(_dollar2)
   guard _args[0].0 is YYObj_Expr(_dollar1)
   guard _args[2].0 is YYObj_Expr(_dollar3)
@@ -20592,10 +21308,10 @@ fn yy_action_613(
 }
 
 // file:///./parser.mbty
-// 1897|    INFIX4 { Var::{ name: Ident(name = $1), loc: mk_loc($sloc) } }
+// 1931|    INFIX4 { Var::{ name: Ident(name = $1), loc: mk_loc($sloc) } }
 
 ///|
-fn yy_action_614(
+fn yy_action_626(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -20618,16 +21334,16 @@ fn yy_action_614(
 }
 
 // file:///./parser.mbty
-// 1547|    infix_expr infixop infix_expr { 
-// 1548|    Infix(op = $2, lhs = $1, rhs = $3, loc = mk_loc($sloc))
-// 1549|  }
+// 1581|    infix_expr infixop infix_expr { 
+// 1582|    Infix(op = $2, lhs = $1, rhs = $3, loc = mk_loc($sloc))
+// 1583|  }
 
 ///|
-fn yy_action_615(
+fn yy_action_627(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_616(_args[0].2, _args[1:2])
+  let _sub_action_0_result = yy_action_628(_args[0].2, _args[1:2])
   guard _sub_action_0_result is YYObj_Var(_dollar2)
   guard _args[0].0 is YYObj_Expr(_dollar1)
   guard _args[2].0 is YYObj_Expr(_dollar3)
@@ -20651,10 +21367,10 @@ fn yy_action_615(
 }
 
 // file:///./parser.mbty
-// 1898|    INFIX3 { Var::{ name: Ident(name = $1), loc: mk_loc($sloc) } }
+// 1932|    INFIX3 { Var::{ name: Ident(name = $1), loc: mk_loc($sloc) } }
 
 ///|
-fn yy_action_616(
+fn yy_action_628(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -20677,16 +21393,16 @@ fn yy_action_616(
 }
 
 // file:///./parser.mbty
-// 1547|    infix_expr infixop infix_expr { 
-// 1548|    Infix(op = $2, lhs = $1, rhs = $3, loc = mk_loc($sloc))
-// 1549|  }
+// 1581|    infix_expr infixop infix_expr { 
+// 1582|    Infix(op = $2, lhs = $1, rhs = $3, loc = mk_loc($sloc))
+// 1583|  }
 
 ///|
-fn yy_action_617(
+fn yy_action_629(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_618(_args[0].2, _args[1:2])
+  let _sub_action_0_result = yy_action_630(_args[0].2, _args[1:2])
   guard _sub_action_0_result is YYObj_Var(_dollar2)
   guard _args[0].0 is YYObj_Expr(_dollar1)
   guard _args[2].0 is YYObj_Expr(_dollar3)
@@ -20710,10 +21426,10 @@ fn yy_action_617(
 }
 
 // file:///./parser.mbty
-// 1899|    INFIX2 { Var::{ name: Ident(name = $1), loc: mk_loc($sloc) } }
+// 1933|    INFIX2 { Var::{ name: Ident(name = $1), loc: mk_loc($sloc) } }
 
 ///|
-fn yy_action_618(
+fn yy_action_630(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -20736,16 +21452,16 @@ fn yy_action_618(
 }
 
 // file:///./parser.mbty
-// 1547|    infix_expr infixop infix_expr { 
-// 1548|    Infix(op = $2, lhs = $1, rhs = $3, loc = mk_loc($sloc))
-// 1549|  }
+// 1581|    infix_expr infixop infix_expr { 
+// 1582|    Infix(op = $2, lhs = $1, rhs = $3, loc = mk_loc($sloc))
+// 1583|  }
 
 ///|
-fn yy_action_619(
+fn yy_action_631(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_620(_args[0].2, _args[1:2])
+  let _sub_action_0_result = yy_action_632(_args[0].2, _args[1:2])
   guard _sub_action_0_result is YYObj_Var(_dollar2)
   guard _args[0].0 is YYObj_Expr(_dollar1)
   guard _args[2].0 is YYObj_Expr(_dollar3)
@@ -20769,10 +21485,10 @@ fn yy_action_619(
 }
 
 // file:///./parser.mbty
-// 1900|    INFIX1 { Var::{ name: Ident(name = $1), loc: mk_loc($sloc) } }
+// 1934|    INFIX1 { Var::{ name: Ident(name = $1), loc: mk_loc($sloc) } }
 
 ///|
-fn yy_action_620(
+fn yy_action_632(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -20795,16 +21511,16 @@ fn yy_action_620(
 }
 
 // file:///./parser.mbty
-// 1547|    infix_expr infixop infix_expr { 
-// 1548|    Infix(op = $2, lhs = $1, rhs = $3, loc = mk_loc($sloc))
-// 1549|  }
+// 1581|    infix_expr infixop infix_expr { 
+// 1582|    Infix(op = $2, lhs = $1, rhs = $3, loc = mk_loc($sloc))
+// 1583|  }
 
 ///|
-fn yy_action_621(
+fn yy_action_633(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_622(_args[0].2, _args[1:2])
+  let _sub_action_0_result = yy_action_634(_args[0].2, _args[1:2])
   guard _sub_action_0_result is YYObj_Var(_dollar2)
   guard _args[0].0 is YYObj_Expr(_dollar1)
   guard _args[2].0 is YYObj_Expr(_dollar3)
@@ -20828,10 +21544,10 @@ fn yy_action_621(
 }
 
 // file:///./parser.mbty
-// 1901|    PLUS { Var::{ name: Ident(name = "+"), loc: mk_loc($sloc) } }
+// 1935|    PLUS { Var::{ name: Ident(name = "+"), loc: mk_loc($sloc) } }
 
 ///|
-fn yy_action_622(
+fn yy_action_634(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -20850,16 +21566,16 @@ fn yy_action_622(
 }
 
 // file:///./parser.mbty
-// 1547|    infix_expr infixop infix_expr { 
-// 1548|    Infix(op = $2, lhs = $1, rhs = $3, loc = mk_loc($sloc))
-// 1549|  }
+// 1581|    infix_expr infixop infix_expr { 
+// 1582|    Infix(op = $2, lhs = $1, rhs = $3, loc = mk_loc($sloc))
+// 1583|  }
 
 ///|
-fn yy_action_623(
+fn yy_action_635(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_624(_args[0].2, _args[1:2])
+  let _sub_action_0_result = yy_action_636(_args[0].2, _args[1:2])
   guard _sub_action_0_result is YYObj_Var(_dollar2)
   guard _args[0].0 is YYObj_Expr(_dollar1)
   guard _args[2].0 is YYObj_Expr(_dollar3)
@@ -20883,10 +21599,10 @@ fn yy_action_623(
 }
 
 // file:///./parser.mbty
-// 1902|    MINUS { Var::{ name: Ident(name = "-"), loc: mk_loc($sloc) } }
+// 1936|    MINUS { Var::{ name: Ident(name = "-"), loc: mk_loc($sloc) } }
 
 ///|
-fn yy_action_624(
+fn yy_action_636(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -20905,16 +21621,16 @@ fn yy_action_624(
 }
 
 // file:///./parser.mbty
-// 1547|    infix_expr infixop infix_expr { 
-// 1548|    Infix(op = $2, lhs = $1, rhs = $3, loc = mk_loc($sloc))
-// 1549|  }
+// 1581|    infix_expr infixop infix_expr { 
+// 1582|    Infix(op = $2, lhs = $1, rhs = $3, loc = mk_loc($sloc))
+// 1583|  }
 
 ///|
-fn yy_action_625(
+fn yy_action_637(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_626(_args[0].2, _args[1:2])
+  let _sub_action_0_result = yy_action_638(_args[0].2, _args[1:2])
   guard _sub_action_0_result is YYObj_Var(_dollar2)
   guard _args[0].0 is YYObj_Expr(_dollar1)
   guard _args[2].0 is YYObj_Expr(_dollar3)
@@ -20938,10 +21654,10 @@ fn yy_action_625(
 }
 
 // file:///./parser.mbty
-// 1903|    AMPER { Var::{ name: Ident(name = "&"), loc: mk_loc($sloc) } }
+// 1937|    AMPER { Var::{ name: Ident(name = "&"), loc: mk_loc($sloc) } }
 
 ///|
-fn yy_action_626(
+fn yy_action_638(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -20960,16 +21676,16 @@ fn yy_action_626(
 }
 
 // file:///./parser.mbty
-// 1547|    infix_expr infixop infix_expr { 
-// 1548|    Infix(op = $2, lhs = $1, rhs = $3, loc = mk_loc($sloc))
-// 1549|  }
+// 1581|    infix_expr infixop infix_expr { 
+// 1582|    Infix(op = $2, lhs = $1, rhs = $3, loc = mk_loc($sloc))
+// 1583|  }
 
 ///|
-fn yy_action_627(
+fn yy_action_639(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_628(_args[0].2, _args[1:2])
+  let _sub_action_0_result = yy_action_640(_args[0].2, _args[1:2])
   guard _sub_action_0_result is YYObj_Var(_dollar2)
   guard _args[0].0 is YYObj_Expr(_dollar1)
   guard _args[2].0 is YYObj_Expr(_dollar3)
@@ -20993,10 +21709,10 @@ fn yy_action_627(
 }
 
 // file:///./parser.mbty
-// 1904|    CARET { Var::{ name: Ident(name = "^"), loc: mk_loc($sloc) } }
+// 1938|    CARET { Var::{ name: Ident(name = "^"), loc: mk_loc($sloc) } }
 
 ///|
-fn yy_action_628(
+fn yy_action_640(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -21015,16 +21731,16 @@ fn yy_action_628(
 }
 
 // file:///./parser.mbty
-// 1547|    infix_expr infixop infix_expr { 
-// 1548|    Infix(op = $2, lhs = $1, rhs = $3, loc = mk_loc($sloc))
-// 1549|  }
+// 1581|    infix_expr infixop infix_expr { 
+// 1582|    Infix(op = $2, lhs = $1, rhs = $3, loc = mk_loc($sloc))
+// 1583|  }
 
 ///|
-fn yy_action_629(
+fn yy_action_641(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_630(_args[0].2, _args[1:2])
+  let _sub_action_0_result = yy_action_642(_args[0].2, _args[1:2])
   guard _sub_action_0_result is YYObj_Var(_dollar2)
   guard _args[0].0 is YYObj_Expr(_dollar1)
   guard _args[2].0 is YYObj_Expr(_dollar3)
@@ -21048,10 +21764,10 @@ fn yy_action_629(
 }
 
 // file:///./parser.mbty
-// 1905|    BAR { Var::{ name: Ident(name = "|"), loc: mk_loc($sloc) } }
+// 1939|    BAR { Var::{ name: Ident(name = "|"), loc: mk_loc($sloc) } }
 
 ///|
-fn yy_action_630(
+fn yy_action_642(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -21070,16 +21786,16 @@ fn yy_action_630(
 }
 
 // file:///./parser.mbty
-// 1547|    infix_expr infixop infix_expr { 
-// 1548|    Infix(op = $2, lhs = $1, rhs = $3, loc = mk_loc($sloc))
-// 1549|  }
+// 1581|    infix_expr infixop infix_expr { 
+// 1582|    Infix(op = $2, lhs = $1, rhs = $3, loc = mk_loc($sloc))
+// 1583|  }
 
 ///|
-fn yy_action_631(
+fn yy_action_643(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_632(_args[0].2, _args[1:2])
+  let _sub_action_0_result = yy_action_644(_args[0].2, _args[1:2])
   guard _sub_action_0_result is YYObj_Var(_dollar2)
   guard _args[0].0 is YYObj_Expr(_dollar1)
   guard _args[2].0 is YYObj_Expr(_dollar3)
@@ -21103,10 +21819,10 @@ fn yy_action_631(
 }
 
 // file:///./parser.mbty
-// 1906|    AMPERAMPER { Var::{ name: Ident(name = "&&"), loc: mk_loc($sloc) } }
+// 1940|    AMPERAMPER { Var::{ name: Ident(name = "&&"), loc: mk_loc($sloc) } }
 
 ///|
-fn yy_action_632(
+fn yy_action_644(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -21128,16 +21844,16 @@ fn yy_action_632(
 }
 
 // file:///./parser.mbty
-// 1547|    infix_expr infixop infix_expr { 
-// 1548|    Infix(op = $2, lhs = $1, rhs = $3, loc = mk_loc($sloc))
-// 1549|  }
+// 1581|    infix_expr infixop infix_expr { 
+// 1582|    Infix(op = $2, lhs = $1, rhs = $3, loc = mk_loc($sloc))
+// 1583|  }
 
 ///|
-fn yy_action_633(
+fn yy_action_645(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_634(_args[0].2, _args[1:2])
+  let _sub_action_0_result = yy_action_646(_args[0].2, _args[1:2])
   guard _sub_action_0_result is YYObj_Var(_dollar2)
   guard _args[0].0 is YYObj_Expr(_dollar1)
   guard _args[2].0 is YYObj_Expr(_dollar3)
@@ -21161,10 +21877,10 @@ fn yy_action_633(
 }
 
 // file:///./parser.mbty
-// 1907|    BARBAR { Var::{ name: Ident(name = "||"), loc: mk_loc($sloc) } }
+// 1941|    BARBAR { Var::{ name: Ident(name = "||"), loc: mk_loc($sloc) } }
 
 ///|
-fn yy_action_634(
+fn yy_action_646(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -21186,10 +21902,10 @@ fn yy_action_634(
 }
 
 // file:///./parser.mbty
-// 1543|    infix_expr { $1 }
+// 1577|    infix_expr { $1 }
 
 ///|
-fn yy_action_635(
+fn yy_action_647(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -21203,10 +21919,10 @@ fn yy_action_635(
 }
 
 // file:///./parser.mbty
-// 1550|    postfix_expr { $1 }
+// 1584|    postfix_expr { $1 }
 
 ///|
-fn yy_action_636(
+fn yy_action_648(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -21220,12 +21936,12 @@ fn yy_action_636(
 }
 
 // file:///./parser.mbty
-// 1554|    range_expr "as" type_name { 
-// 1555|    As(expr = $1, trait_ = $3, loc = mk_loc($sloc))
-// 1556|  }
+// 1588|    range_expr "as" type_name { 
+// 1589|    As(expr = $1, trait_ = $3, loc = mk_loc($sloc))
+// 1590|  }
 
 ///|
-fn yy_action_637(
+fn yy_action_649(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -21250,12 +21966,12 @@ fn yy_action_637(
 }
 
 // file:///./parser.mbty
-// 1557|    range_expr "is" range_pattern { 
-// 1558|    Is(expr = $1, pat = $3, loc = mk_loc($sloc))
-// 1559|  }
+// 1591|    range_expr "is" range_pattern { 
+// 1592|    Is(expr = $1, pat = $3, loc = mk_loc($sloc))
+// 1593|  }
 
 ///|
-fn yy_action_638(
+fn yy_action_650(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -21276,10 +21992,10 @@ fn yy_action_638(
 }
 
 // file:///./parser.mbty
-// 2005|    "{" "}" { Record(fields = @list.empty(), is_closed = true, loc = mk_loc($sloc)) }
+// 2039|    "{" "}" { Record(fields = @list.empty(), is_closed = true, loc = mk_loc($sloc)) }
 
 ///|
-fn yy_action_639(
+fn yy_action_651(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -21302,10 +22018,10 @@ fn yy_action_639(
 }
 
 // file:///./parser.mbty
-// 2006|    "{" ".." option(",") "}" { Record(fields = @list.empty(), is_closed = false, loc = mk_loc($sloc)) }
+// 2040|    "{" ".." option(",") "}" { Record(fields = @list.empty(), is_closed = false, loc = mk_loc($sloc)) }
 
 ///|
-fn yy_action_640(
+fn yy_action_652(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -21328,13 +22044,13 @@ fn yy_action_640(
 }
 
 // file:///./parser.mbty
-// 2007|    "{" non_empty_fields_pat "}" { 
-// 2008|    let (fields, is_closed) = $2
-// 2009|    Record(fields~, is_closed~, loc = mk_loc($sloc))
-// 2010|  }
+// 2041|    "{" non_empty_fields_pat "}" { 
+// 2042|    let (fields, is_closed) = $2
+// 2043|    Record(fields~, is_closed~, loc = mk_loc($sloc))
+// 2044|  }
 
 ///|
-fn yy_action_641(
+fn yy_action_653(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -21355,13 +22071,13 @@ fn yy_action_641(
 }
 
 // file:///./parser.mbty
-// 2011|    "{" non_empty_map_elems_pat "}" { 
-// 2012|    let (elems, is_closed) = $2
-// 2013|    Map(elems~, is_closed~, loc = mk_loc($sloc))
-// 2014|  }
+// 2045|    "{" non_empty_map_elems_pat "}" { 
+// 2046|    let (elems, is_closed) = $2
+// 2047|    Map(elems~, is_closed~, loc = mk_loc($sloc))
+// 2048|  }
 
 ///|
-fn yy_action_642(
+fn yy_action_654(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -21382,10 +22098,10 @@ fn yy_action_642(
 }
 
 // file:///./parser.mbty
-// 2209|    non_empty_list_commas(fields_pat_single) { ($1, true) }
+// 2277|    non_empty_list_commas(fields_pat_single) { ($1, true) }
 
 ///|
-fn yy_action_643(
+fn yy_action_655(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -21399,10 +22115,10 @@ fn yy_action_643(
 }
 
 // file:///./parser.mbty
-// 2210|    non_empty_list_commas_with_tail(fields_pat_single) ".." option(",") { ($1, false) }
+// 2278|    non_empty_list_commas_with_tail(fields_pat_single) ".." option(",") { ($1, false) }
 
 ///|
-fn yy_action_644(
+fn yy_action_656(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -21416,10 +22132,10 @@ fn yy_action_644(
 }
 
 // file:///./parser.mbty
-// 2227|    non_empty_list_commas(map_elem_pat) { ($1, true) }
+// 2295|    non_empty_list_commas(map_elem_pat) { ($1, true) }
 
 ///|
-fn yy_action_645(
+fn yy_action_657(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -21433,10 +22149,10 @@ fn yy_action_645(
 }
 
 // file:///./parser.mbty
-// 2228|    non_empty_list_commas_with_tail(map_elem_pat) ".." option(",") { ($1, false) }
+// 2296|    non_empty_list_commas_with_tail(map_elem_pat) ".." option(",") { ($1, false) }
 
 ///|
-fn yy_action_646(
+fn yy_action_658(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -21450,14 +22166,14 @@ fn yy_action_646(
 }
 
 // file:///./parser.mbty
-// 2214|    fpat_labeled_pattern { $1 }
+// 2282|    fpat_labeled_pattern { $1 }
 
 ///|
-fn yy_action_647(
+fn yy_action_659(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_648(_last_pos, _args[0:3])
+  let _sub_action_0_result = yy_action_660(_last_pos, _args[0:3])
   guard _sub_action_0_result is YYObj_FieldPat(_dollar1)
   YYObj_FieldPat(
     {
@@ -21468,14 +22184,14 @@ fn yy_action_647(
 }
 
 // file:///./parser.mbty
-// 2219|    label ":" pattern { @syntax.make_field_pat(loc = mk_loc($sloc), $1, $3, false) }
+// 2287|    label ":" pattern { @syntax.make_field_pat(loc = mk_loc($sloc), $1, $3, false) }
 
 ///|
-fn yy_action_648(
+fn yy_action_660(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_480(_last_pos, _args[0:1])
+  let _sub_action_0_result = yy_action_490(_last_pos, _args[0:1])
   let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
   let _end_pos = if _args.length() == 0 {
     _last_pos
@@ -21498,14 +22214,14 @@ fn yy_action_648(
 }
 
 // file:///./parser.mbty
-// 2215|   fpat_label_pun { $1 }
+// 2283|   fpat_label_pun { $1 }
 
 ///|
-fn yy_action_649(
+fn yy_action_661(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_650(_last_pos, _args[0:1])
+  let _sub_action_0_result = yy_action_662(_last_pos, _args[0:1])
   guard _sub_action_0_result is YYObj_FieldPat(_dollar1)
   YYObj_FieldPat(
     {
@@ -21516,14 +22232,14 @@ fn yy_action_649(
 }
 
 // file:///./parser.mbty
-// 2223|    label { @syntax.make_field_pat(loc = mk_loc($sloc), $1, @syntax.label_to_pat(loc = mk_loc($sloc), $1), true) }
+// 2291|    label { @syntax.make_field_pat(loc = mk_loc($sloc), $1, @syntax.label_to_pat(loc = mk_loc($sloc), $1), true) }
 
 ///|
-fn yy_action_650(
+fn yy_action_662(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_480(_last_pos, _args[0:1])
+  let _sub_action_0_result = yy_action_490(_last_pos, _args[0:1])
   let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
   let _end_pos = if _args.length() == 0 {
     _last_pos
@@ -21548,10 +22264,10 @@ fn yy_action_650(
 }
 
 // file:///./parser.mbty
-// 174|    non_empty_list_commas_rev(X) "," X { $1.add($3) }
+// 179|    non_empty_list_commas_rev(X) "," X { $1.add($3) }
 
 ///|
-fn yy_action_651(
+fn yy_action_663(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -21566,10 +22282,10 @@ fn yy_action_651(
 }
 
 // file:///./parser.mbty
-// 186|    non_empty_list_commas_rev(X) "," { $1.rev() }
+// 191|    non_empty_list_commas_rev(X) "," { $1.rev() }
 
 ///|
-fn yy_action_652(
+fn yy_action_664(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -21583,10 +22299,10 @@ fn yy_action_652(
 }
 
 // file:///./parser.mbty
-// 182|    non_empty_list_commas_rev(X) option(",") { $1.rev() }
+// 187|    non_empty_list_commas_rev(X) option(",") { $1.rev() }
 
 ///|
-fn yy_action_653(
+fn yy_action_665(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -21600,10 +22316,10 @@ fn yy_action_653(
 }
 
 // file:///./parser.mbty
-// 1882|    simple_constant { $1 }
+// 1916|    simple_constant { $1 }
 
 ///|
-fn yy_action_654(
+fn yy_action_666(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -21617,10 +22333,10 @@ fn yy_action_654(
 }
 
 // file:///./parser.mbty
-// 1883|    MINUS INT { make_int("-" + $2) }
+// 1917|    MINUS INT { make_int("-" + $2) }
 
 ///|
-fn yy_action_655(
+fn yy_action_667(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -21634,10 +22350,10 @@ fn yy_action_655(
 }
 
 // file:///./parser.mbty
-// 1884|    MINUS DOUBLE { make_double("-" + $2) }
+// 1918|    MINUS DOUBLE { make_double("-" + $2) }
 
 ///|
-fn yy_action_656(
+fn yy_action_668(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -21651,10 +22367,10 @@ fn yy_action_656(
 }
 
 // file:///./parser.mbty
-// 1885|    MINUS FLOAT { make_float("-" + $2) }
+// 1919|    MINUS FLOAT { make_float("-" + $2) }
 
 ///|
-fn yy_action_657(
+fn yy_action_669(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -21668,14 +22384,14 @@ fn yy_action_657(
 }
 
 // file:///./parser.mbty
-// 174|    non_empty_list_commas_rev(X) "," X { $1.add($3) }
+// 179|    non_empty_list_commas_rev(X) "," X { $1.add($3) }
 
 ///|
-fn yy_action_658(
+fn yy_action_670(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_659(_args[1].2, _args[2:6])
+  let _sub_action_0_result = yy_action_671(_args[1].2, _args[2:6])
   guard _args[0].0 is YYObj_List_MapPatElem_(_dollar1)
   guard _sub_action_0_result is YYObj_MapPatElem(_dollar3)
   YYObj_List_MapPatElem_(
@@ -21687,10 +22403,10 @@ fn yy_action_658(
 }
 
 // file:///./parser.mbty
-// 186|    non_empty_list_commas_rev(X) "," { $1.rev() }
+// 191|    non_empty_list_commas_rev(X) "," { $1.rev() }
 
 ///|
-fn yy_action_660(
+fn yy_action_672(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -21704,10 +22420,10 @@ fn yy_action_660(
 }
 
 // file:///./parser.mbty
-// 182|    non_empty_list_commas_rev(X) option(",") { $1.rev() }
+// 187|    non_empty_list_commas_rev(X) option(",") { $1.rev() }
 
 ///|
-fn yy_action_661(
+fn yy_action_673(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -21721,10 +22437,10 @@ fn yy_action_661(
 }
 
 // file:///./parser.mbty
-// 173|    X { @list.singleton($1) }
+// 178|    X { @list.singleton($1) }
 
 ///|
-fn yy_action_662(
+fn yy_action_674(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -21741,7 +22457,7 @@ fn yy_action_662(
 // 5|    X { Some($1) }
 
 ///|
-fn yy_action_663(
+fn yy_action_675(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -21755,14 +22471,14 @@ fn yy_action_663(
 }
 
 // file:///./parser.mbty
-// 173|    X { @list.singleton($1) }
+// 178|    X { @list.singleton($1) }
 
 ///|
-fn yy_action_664(
+fn yy_action_676(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_659(_last_pos, _args[0:4])
+  let _sub_action_0_result = yy_action_671(_last_pos, _args[0:4])
   guard _sub_action_0_result is YYObj_MapPatElem(_dollar1)
   YYObj_List_MapPatElem_(
     {
@@ -21773,18 +22489,18 @@ fn yy_action_664(
 }
 
 // file:///./parser.mbty
-// 2232|    map_syntax_key option("?") ":" pattern { 
-// 2233|    MapPatElem::{
-// 2234|      key: $1,
-// 2235|      pat: $4,
-// 2236|      match_absent: $2 is Some(_),
-// 2237|      key_loc: mk_loc($loc($1)),
-// 2238|      loc: mk_loc($sloc)
-// 2239|    }
-// 2240|  }
+// 2300|    map_syntax_key option("?") ":" pattern { 
+// 2301|    MapPatElem::{
+// 2302|      key: $1,
+// 2303|      pat: $4,
+// 2304|      match_absent: $2 is Some(_),
+// 2305|      key_loc: mk_loc($loc($1)),
+// 2306|      loc: mk_loc($sloc)
+// 2307|    }
+// 2308|  }
 
 ///|
-fn yy_action_659(
+fn yy_action_671(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -21814,10 +22530,10 @@ fn yy_action_659(
 }
 
 // file:///./parser.mbty
-// 2004|    "[" array_sub_patterns "]" { Array(pats = $2, loc = mk_loc($sloc)) }
+// 2038|    "[" array_sub_patterns "]" { Array(pats = $2, loc = mk_loc($sloc)) }
 
 ///|
-fn yy_action_665(
+fn yy_action_677(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -21837,10 +22553,10 @@ fn yy_action_665(
 }
 
 // file:///./parser.mbty
-// 2032|    ".." binder { Binder($2) }
+// 2066|    ".." binder { Binder($2) }
 
 ///|
-fn yy_action_666(
+fn yy_action_678(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -21855,10 +22571,10 @@ fn yy_action_666(
 }
 
 // file:///./parser.mbty
-// 2033|    ".." "_" { Underscore }
+// 2067|    ".." "_" { Underscore }
 
 ///|
-fn yy_action_667(
+fn yy_action_679(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -21871,10 +22587,10 @@ fn yy_action_667(
 }
 
 // file:///./parser.mbty
-// 2034|    ".." "as" binder { BinderAs($3) }
+// 2068|    ".." "as" binder { BinderAs($3) }
 
 ///|
-fn yy_action_668(
+fn yy_action_680(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -21889,10 +22605,10 @@ fn yy_action_668(
 }
 
 // file:///./parser.mbty
-// 2035|    ".." { NoBinder }
+// 2069|    ".." { NoBinder }
 
 ///|
-fn yy_action_669(
+fn yy_action_681(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -21905,15 +22621,15 @@ fn yy_action_669(
 }
 
 // file:///./parser.mbty
-// 2041|    array_sub_pattern "," array_sub_patterns { 
-// 2042|    match $3 {
-// 2043|      Closed(ps) => Closed(ps.add($1))
-// 2044|      Open(ps1, ps2, b) => Open(ps1.add($1), ps2, b)
-// 2045|    }
-// 2046|  }
+// 2075|    array_sub_pattern "," array_sub_patterns { 
+// 2076|    match $3 {
+// 2077|      Closed(ps) => Closed(ps.add($1))
+// 2078|      Open(ps1, ps2, b) => Open(ps1.add($1), ps2, b)
+// 2079|    }
+// 2080|  }
 
 ///|
-fn yy_action_670(
+fn yy_action_682(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -21931,10 +22647,10 @@ fn yy_action_670(
 }
 
 // file:///./parser.mbty
-// 2040|    array_sub_pattern { Closed(@list.singleton($1)) }
+// 2074|    array_sub_pattern { Closed(@list.singleton($1)) }
 
 ///|
-fn yy_action_671(
+fn yy_action_683(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -21948,10 +22664,10 @@ fn yy_action_671(
 }
 
 // file:///./parser.mbty
-// 2047|    dotdot_binder "," non_empty_list_commas(array_sub_pattern) { Open(@list.empty(), $3, $1) }
+// 2081|    dotdot_binder "," non_empty_list_commas(array_sub_pattern) { Open(@list.empty(), $3, $1) }
 
 ///|
-fn yy_action_672(
+fn yy_action_684(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -21966,10 +22682,10 @@ fn yy_action_672(
 }
 
 // file:///./parser.mbty
-// 2018|    pattern { Pattern($1) }
+// 2052|    pattern { Pattern($1) }
 
 ///|
-fn yy_action_673(
+fn yy_action_685(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -21983,10 +22699,10 @@ fn yy_action_673(
 }
 
 // file:///./parser.mbty
-// 2001|    "(" pattern ")" { $2 }
+// 2035|    "(" pattern ")" { $2 }
 
 ///|
-fn yy_action_674(
+fn yy_action_686(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -22000,10 +22716,10 @@ fn yy_action_674(
 }
 
 // file:///./parser.mbty
-// 173|    X { @list.singleton($1) }
+// 178|    X { @list.singleton($1) }
 
 ///|
-fn yy_action_675(
+fn yy_action_687(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -22017,10 +22733,10 @@ fn yy_action_675(
 }
 
 // file:///./parser.mbty
-// 2002|    "(" pattern "," non_empty_list_commas(pattern) ")" { @syntax.make_tuple_pattern(loc = mk_loc($sloc), $4.add($2)) }
+// 2036|    "(" pattern "," non_empty_list_commas(pattern) ")" { @syntax.make_tuple_pattern(loc = mk_loc($sloc), $4.add($2)) }
 
 ///|
-fn yy_action_676(
+fn yy_action_688(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -22044,10 +22760,10 @@ fn yy_action_676(
 }
 
 // file:///./parser.mbty
-// 182|    non_empty_list_commas_rev(X) option(",") { $1.rev() }
+// 187|    non_empty_list_commas_rev(X) option(",") { $1.rev() }
 
 ///|
-fn yy_action_677(
+fn yy_action_689(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -22061,10 +22777,10 @@ fn yy_action_677(
 }
 
 // file:///./parser.mbty
-// 174|    non_empty_list_commas_rev(X) "," X { $1.add($3) }
+// 179|    non_empty_list_commas_rev(X) "," X { $1.add($3) }
 
 ///|
-fn yy_action_678(
+fn yy_action_690(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -22079,14 +22795,14 @@ fn yy_action_678(
 }
 
 // file:///./parser.mbty
-// 2003|    "(" pattern annot ")" { Constraint(pat = $2, ty = $3, loc = mk_loc($sloc)) }
+// 2037|    "(" pattern annot ")" { Constraint(pat = $2, ty = $3, loc = mk_loc($sloc)) }
 
 ///|
-fn yy_action_679(
+fn yy_action_691(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_454(_args[1].2, _args[2:4])
+  let _sub_action_0_result = yy_action_464(_args[1].2, _args[2:4])
   guard _args[1].0 is YYObj_Pattern(_dollar2)
   guard _sub_action_0_result is YYObj_Type(_dollar3)
   let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
@@ -22108,10 +22824,10 @@ fn yy_action_679(
 }
 
 // file:///./parser.mbty
-// 243|    ":" type_ { $2 }
+// 248|    ":" type_ { $2 }
 
 ///|
-fn yy_action_454(
+fn yy_action_464(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -22125,16 +22841,16 @@ fn yy_action_454(
 }
 
 // file:///./parser.mbty
-// 1989|    constr option(delimited("(", constr_pat_arguments, ")")) { 
-// 1990|    let (args, is_open) = match $2 {
-// 1991|      None => (None, false)
-// 1992|      Some((args, is_open)) => (Some(args), is_open)
-// 1993|    }
-// 1994|    @syntax.make_constr_pattern(loc = mk_loc($sloc), $1, args, is_open)
-// 1995|  }
+// 2023|    constr option(delimited("(", constr_pat_arguments, ")")) { 
+// 2024|    let (args, is_open) = match $2 {
+// 2025|      None => (None, false)
+// 2026|      Some((args, is_open)) => (Some(args), is_open)
+// 2027|    }
+// 2028|    @syntax.make_constr_pattern(loc = mk_loc($sloc), $1, args, is_open)
+// 2029|  }
 
 ///|
-fn yy_action_680(
+fn yy_action_692(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -22164,10 +22880,10 @@ fn yy_action_680(
 }
 
 // file:///./parser.mbty
-// 2244|    constr_pat_argument option(",") { (@list.singleton($1), false) }
+// 2312|    constr_pat_argument option(",") { (@list.singleton($1), false) }
 
 ///|
-fn yy_action_681(
+fn yy_action_693(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -22181,19 +22897,19 @@ fn yy_action_681(
 }
 
 // file:///./parser.mbty
-// 2258|    label "=" pattern { 
-// 2259|    ConstrPatArg::{
-// 2260|      pat: $3,
-// 2261|      kind: Labelled($1)
-// 2262|    }
-// 2263|  }
+// 2326|    label "=" pattern { 
+// 2327|    ConstrPatArg::{
+// 2328|      pat: $3,
+// 2329|      kind: Labelled($1)
+// 2330|    }
+// 2331|  }
 
 ///|
-fn yy_action_682(
+fn yy_action_694(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_480(_last_pos, _args[0:1])
+  let _sub_action_0_result = yy_action_490(_last_pos, _args[0:1])
   guard _args[2].0 is YYObj_Pattern(_dollar3)
   guard _sub_action_0_result is YYObj_Label(_dollar1)
   YYObj_ConstrPatArg(
@@ -22205,17 +22921,17 @@ fn yy_action_682(
 }
 
 // file:///./parser.mbty
-// 1998|    binder delimited("(", constr_pat_arguments_no_open, ")") {
-// 1999|    Pattern::SpecialConstr(binder = $1, args = $2, loc = mk_loc($sloc))
-// 2000|  }
+// 2032|    binder delimited("(", constr_pat_arguments_no_open, ")") {
+// 2033|    Pattern::SpecialConstr(binder = $1, args = $2, loc = mk_loc($sloc))
+// 2034|  }
 
 ///|
-fn yy_action_683(
+fn yy_action_695(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
   let _sub_action_0_result = yy_action_16(_last_pos, _args[0:1])
-  let _sub_action_1_result = yy_action_684(_args[0].2, _args[1:4])
+  let _sub_action_1_result = yy_action_696(_args[0].2, _args[1:4])
   guard _sub_action_0_result is YYObj_Binder(_dollar1)
   guard _sub_action_1_result is YYObj_List_ConstrPatArg_(_dollar2)
   let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
@@ -22240,7 +22956,7 @@ fn yy_action_683(
 // 40|    L X R { $2 }
 
 ///|
-fn yy_action_684(
+fn yy_action_696(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -22254,10 +22970,10 @@ fn yy_action_684(
 }
 
 // file:///./parser.mbty
-// 2253|    constr_pat_argument option(",") { @list.singleton($1) }
+// 2321|    constr_pat_argument option(",") { @list.singleton($1) }
 
 ///|
-fn yy_action_685(
+fn yy_action_697(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -22271,10 +22987,10 @@ fn yy_action_685(
 }
 
 // file:///./parser.mbty
-// 1959|    pattern "as" binder { @syntax.make_alias_pattern(loc = mk_loc($sloc), $1, $3) }
+// 1993|    pattern "as" binder { @syntax.make_alias_pattern(loc = mk_loc($sloc), $1, $3) }
 
 ///|
-fn yy_action_686(
+fn yy_action_698(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -22300,15 +23016,15 @@ fn yy_action_686(
 }
 
 // file:///./parser.mbty
-// 2273|    pattern { 
-// 2274|    ConstrPatArg::{
-// 2275|      pat: $1,
-// 2276|      kind: Positional
-// 2277|    }
-// 2278|  }
+// 2341|    pattern { 
+// 2342|    ConstrPatArg::{
+// 2343|      pat: $1,
+// 2344|      kind: Positional
+// 2345|    }
+// 2346|  }
 
 ///|
-fn yy_action_687(
+fn yy_action_699(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -22322,10 +23038,10 @@ fn yy_action_687(
 }
 
 // file:///./parser.mbty
-// 1960|    or_pattern { $1 }
+// 1994|    or_pattern { $1 }
 
 ///|
-fn yy_action_688(
+fn yy_action_700(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -22339,10 +23055,10 @@ fn yy_action_688(
 }
 
 // file:///./parser.mbty
-// 1964|    range_pattern "|" or_pattern { Or(pat1 = $1, pat2 = $3, loc = mk_loc($sloc)) }
+// 1998|    range_pattern "|" or_pattern { Or(pat1 = $1, pat2 = $3, loc = mk_loc($sloc)) }
 
 ///|
-fn yy_action_689(
+fn yy_action_701(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -22367,10 +23083,10 @@ fn yy_action_689(
 }
 
 // file:///./parser.mbty
-// 1965|    range_pattern { $1 }
+// 1999|    range_pattern { $1 }
 
 ///|
-fn yy_action_690(
+fn yy_action_702(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -22384,10 +23100,10 @@ fn yy_action_690(
 }
 
 // file:///./parser.mbty
-// 1969|    simple_pattern "..<" simple_pattern { Range(lhs = $1, rhs = $3, kind=Exclusive, loc = mk_loc($sloc)) }
+// 2003|    simple_pattern "..<" simple_pattern { Range(lhs = $1, rhs = $3, kind=Exclusive, loc = mk_loc($sloc)) }
 
 ///|
-fn yy_action_691(
+fn yy_action_703(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -22413,16 +23129,16 @@ fn yy_action_691(
 }
 
 // file:///./parser.mbty
-// 1649|    type_name "::" UIDENT { 
-// 1650|    Constructor::{
-// 1651|      name: ConstrName::{ name: $3, loc: mk_loc($loc($3)) },
-// 1652|      extra_info: TypeName($1),
-// 1653|      loc: mk_loc($sloc)
-// 1654|    }
-// 1655|  }
+// 1683|    type_name "::" UIDENT { 
+// 1684|    Constructor::{
+// 1685|      name: ConstrName::{ name: $3, loc: mk_loc($loc($3)) },
+// 1686|      extra_info: TypeName($1),
+// 1687|      loc: mk_loc($sloc)
+// 1688|    }
+// 1689|  }
 
 ///|
-fn yy_action_692(
+fn yy_action_704(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -22452,10 +23168,10 @@ fn yy_action_692(
 }
 
 // file:///./parser.mbty
-// 1970|    simple_pattern "..=" simple_pattern { Range(lhs = $1, rhs = $3, kind=Inclusive, loc = mk_loc($sloc)) }
+// 2004|    simple_pattern "..=" simple_pattern { Range(lhs = $1, rhs = $3, kind=Inclusive, loc = mk_loc($sloc)) }
 
 ///|
-fn yy_action_693(
+fn yy_action_705(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -22481,10 +23197,10 @@ fn yy_action_693(
 }
 
 // file:///./parser.mbty
-// 1971|    simple_pattern { $1 }
+// 2005|    simple_pattern { $1 }
 
 ///|
-fn yy_action_694(
+fn yy_action_706(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -22498,10 +23214,10 @@ fn yy_action_694(
 }
 
 // file:///./parser.mbty
-// 1975|    TRUE { @syntax.make_constant_pattern(loc = mk_loc($sloc), Bool(true)) }
+// 2009|    TRUE { @syntax.make_constant_pattern(loc = mk_loc($sloc), Bool(true)) }
 
 ///|
-fn yy_action_695(
+fn yy_action_707(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -22523,10 +23239,10 @@ fn yy_action_695(
 }
 
 // file:///./parser.mbty
-// 1976|    FALSE { @syntax.make_constant_pattern(loc = mk_loc($sloc), Bool(false)) }
+// 2010|    FALSE { @syntax.make_constant_pattern(loc = mk_loc($sloc), Bool(false)) }
 
 ///|
-fn yy_action_696(
+fn yy_action_708(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -22548,10 +23264,10 @@ fn yy_action_696(
 }
 
 // file:///./parser.mbty
-// 1977|    CHAR { @syntax.make_constant_pattern(loc = mk_loc($sloc), Char($1)) }
+// 2011|    CHAR { @syntax.make_constant_pattern(loc = mk_loc($sloc), Char($1)) }
 
 ///|
-fn yy_action_697(
+fn yy_action_709(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -22574,10 +23290,10 @@ fn yy_action_697(
 }
 
 // file:///./parser.mbty
-// 1978|    INT { @syntax.make_constant_pattern(loc = mk_loc($sloc), @syntax.make_int($1)) }
+// 2012|    INT { @syntax.make_constant_pattern(loc = mk_loc($sloc), @syntax.make_int($1)) }
 
 ///|
-fn yy_action_698(
+fn yy_action_710(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -22600,10 +23316,10 @@ fn yy_action_698(
 }
 
 // file:///./parser.mbty
-// 1979|    BYTE { @syntax.make_constant_pattern(loc = mk_loc($sloc), Byte($1)) }
+// 2013|    BYTE { @syntax.make_constant_pattern(loc = mk_loc($sloc), Byte($1)) }
 
 ///|
-fn yy_action_699(
+fn yy_action_711(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -22626,10 +23342,10 @@ fn yy_action_699(
 }
 
 // file:///./parser.mbty
-// 1980|    DOUBLE { @syntax.make_constant_pattern(loc = mk_loc($sloc), @syntax.make_double($1)) }
+// 2014|    DOUBLE { @syntax.make_constant_pattern(loc = mk_loc($sloc), @syntax.make_double($1)) }
 
 ///|
-fn yy_action_700(
+fn yy_action_712(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -22652,10 +23368,10 @@ fn yy_action_700(
 }
 
 // file:///./parser.mbty
-// 1981|    FLOAT { @syntax.make_constant_pattern(loc = mk_loc($sloc), @syntax.make_float($1)) }
+// 2015|    FLOAT { @syntax.make_constant_pattern(loc = mk_loc($sloc), @syntax.make_float($1)) }
 
 ///|
-fn yy_action_701(
+fn yy_action_713(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -22678,10 +23394,10 @@ fn yy_action_701(
 }
 
 // file:///./parser.mbty
-// 1982|    "-" INT { @syntax.make_constant_pattern(loc = mk_loc($sloc), @syntax.make_int("-" + $2)) }
+// 2016|    "-" INT { @syntax.make_constant_pattern(loc = mk_loc($sloc), @syntax.make_int("-" + $2)) }
 
 ///|
-fn yy_action_702(
+fn yy_action_714(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -22704,10 +23420,10 @@ fn yy_action_702(
 }
 
 // file:///./parser.mbty
-// 1983|    "-" DOUBLE { @syntax.make_constant_pattern(loc = mk_loc($sloc), @syntax.make_double("-" + $2)) }
+// 2017|    "-" DOUBLE { @syntax.make_constant_pattern(loc = mk_loc($sloc), @syntax.make_double("-" + $2)) }
 
 ///|
-fn yy_action_703(
+fn yy_action_715(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -22730,10 +23446,10 @@ fn yy_action_703(
 }
 
 // file:///./parser.mbty
-// 1984|    "-" FLOAT { @syntax.make_constant_pattern(loc = mk_loc($sloc), @syntax.make_float("-" + $2)) }
+// 2018|    "-" FLOAT { @syntax.make_constant_pattern(loc = mk_loc($sloc), @syntax.make_float("-" + $2)) }
 
 ///|
-fn yy_action_704(
+fn yy_action_716(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -22756,10 +23472,10 @@ fn yy_action_704(
 }
 
 // file:///./parser.mbty
-// 1985|    STRING { @syntax.make_constant_pattern(loc = mk_loc($sloc), String($1)) }
+// 2019|    STRING { @syntax.make_constant_pattern(loc = mk_loc($sloc), String($1)) }
 
 ///|
-fn yy_action_705(
+fn yy_action_717(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -22782,10 +23498,10 @@ fn yy_action_705(
 }
 
 // file:///./parser.mbty
-// 1986|    BYTES { @syntax.make_constant_pattern(loc = mk_loc($sloc), Bytes($1)) }
+// 2020|    BYTES { @syntax.make_constant_pattern(loc = mk_loc($sloc), Bytes($1)) }
 
 ///|
-fn yy_action_706(
+fn yy_action_718(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -22808,10 +23524,10 @@ fn yy_action_706(
 }
 
 // file:///./parser.mbty
-// 1987|    UNDERSCORE { Any(loc = mk_loc($sloc)) }
+// 2021|    UNDERSCORE { Any(loc = mk_loc($sloc)) }
 
 ///|
-fn yy_action_707(
+fn yy_action_719(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -22830,10 +23546,10 @@ fn yy_action_707(
 }
 
 // file:///./parser.mbty
-// 2254|    constr_pat_argument "," constr_pat_arguments_no_open { $3.add($1) }
+// 2322|    constr_pat_argument "," constr_pat_arguments_no_open { $3.add($1) }
 
 ///|
-fn yy_action_708(
+fn yy_action_720(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -22848,10 +23564,10 @@ fn yy_action_708(
 }
 
 // file:///./parser.mbty
-// 1988|    binder { Var($1) }
+// 2022|    binder { Var($1) }
 
 ///|
-fn yy_action_709(
+fn yy_action_721(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -22866,13 +23582,13 @@ fn yy_action_709(
 }
 
 // file:///./parser.mbty
-// 2246|    constr_pat_argument "," constr_pat_arguments { 
-// 2247|    let (args, is_open) = $3
-// 2248|    (args.add($1), is_open)
-// 2249|  }
+// 2314|    constr_pat_argument "," constr_pat_arguments { 
+// 2315|    let (args, is_open) = $3
+// 2316|    (args.add($1), is_open)
+// 2317|  }
 
 ///|
-fn yy_action_710(
+fn yy_action_722(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -22888,10 +23604,10 @@ fn yy_action_710(
 }
 
 // file:///./parser.mbty
-// 2245|    ".." option(",") { (@list.empty(), true) }
+// 2313|    ".." option(",") { (@list.empty(), true) }
 
 ///|
-fn yy_action_711(
+fn yy_action_723(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -22904,18 +23620,18 @@ fn yy_action_711(
 }
 
 // file:///./parser.mbty
-// 2264|    POST_LABEL { 
-// 2265|    let loc = mk_loc($loc($1))
-// 2266|    let label = Label::{ name: $1, loc }
-// 2267|    let pat = @syntax.label_to_pat(loc = loc.trim_last_char(), label)
-// 2268|    ConstrPatArg::{
-// 2269|      pat,
-// 2270|      kind: LabelledPun(label)
-// 2271|    }
-// 2272|  }
+// 2332|    POST_LABEL { 
+// 2333|    let loc = mk_loc($loc($1))
+// 2334|    let label = Label::{ name: $1, loc }
+// 2335|    let pat = @syntax.label_to_pat(loc = loc.trim_last_char(), label)
+// 2336|    ConstrPatArg::{
+// 2337|      pat,
+// 2338|      kind: LabelledPun(label)
+// 2339|    }
+// 2340|  }
 
 ///|
-fn yy_action_712(
+fn yy_action_724(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -22937,11 +23653,11 @@ fn yy_action_712(
 // 5|    X { Some($1) }
 
 ///|
-fn yy_action_713(
+fn yy_action_725(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_714(_last_pos, _args[0:3])
+  let _sub_action_0_result = yy_action_726(_last_pos, _args[0:3])
   guard _sub_action_0_result is YYObj__List_ConstrPatArg___Bool_(_dollar1)
   YYObj_Option__List_ConstrPatArg___Bool__(
     {
@@ -22955,7 +23671,7 @@ fn yy_action_713(
 // 40|    L X R { $2 }
 
 ///|
-fn yy_action_714(
+fn yy_action_726(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -22972,7 +23688,7 @@ fn yy_action_714(
 // 4|    { None }
 
 ///|
-fn yy_action_715(
+fn yy_action_727(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -22985,10 +23701,10 @@ fn yy_action_715(
 }
 
 // file:///./parser.mbty
-// 2019|    ".." STRING { StringSpread(str = $2, loc = mk_loc($loc($2))) }
+// 2053|    ".." STRING { StringSpread(str = $2, loc = mk_loc($loc($2))) }
 
 ///|
-fn yy_action_716(
+fn yy_action_728(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -23007,10 +23723,10 @@ fn yy_action_716(
 }
 
 // file:///./parser.mbty
-// 2020|    ".." BYTES { BytesSpread(bytes = $2, loc = mk_loc($loc($2))) }
+// 2054|    ".." BYTES { BytesSpread(bytes = $2, loc = mk_loc($loc($2))) }
 
 ///|
-fn yy_action_717(
+fn yy_action_729(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -23029,13 +23745,13 @@ fn yy_action_717(
 }
 
 // file:///./parser.mbty
-// 2021|    ".." UIDENT { 
-// 2022|    let binder = Binder::{ name: $2, loc: mk_loc($loc($2)) }
-// 2023|    ConstSpread(binder~, pkg = None, loc = mk_loc($sloc))
-// 2024|  }
+// 2055|    ".." UIDENT { 
+// 2056|    let binder = Binder::{ name: $2, loc: mk_loc($loc($2)) }
+// 2057|    ConstSpread(binder~, pkg = None, loc = mk_loc($sloc))
+// 2058|  }
 
 ///|
-fn yy_action_718(
+fn yy_action_730(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -23061,13 +23777,13 @@ fn yy_action_718(
 }
 
 // file:///./parser.mbty
-// 2025|    ".." PACKAGE_NAME DOT_UIDENT { 
-// 2026|    let binder = Binder::{ name: $3, loc: mk_loc($loc($3)) }
-// 2027|    ConstSpread(binder~, pkg = Some($2), loc = mk_loc($sloc))
-// 2028|  }
+// 2059|    ".." PACKAGE_NAME DOT_UIDENT { 
+// 2060|    let binder = Binder::{ name: $3, loc: mk_loc($loc($3)) }
+// 2061|    ConstSpread(binder~, pkg = Some($2), loc = mk_loc($sloc))
+// 2062|  }
 
 ///|
-fn yy_action_719(
+fn yy_action_731(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -23098,10 +23814,10 @@ fn yy_action_719(
 }
 
 // file:///./parser.mbty
-// 174|    non_empty_list_commas_rev(X) "," X { $1.add($3) }
+// 179|    non_empty_list_commas_rev(X) "," X { $1.add($3) }
 
 ///|
-fn yy_action_720(
+fn yy_action_732(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -23116,10 +23832,10 @@ fn yy_action_720(
 }
 
 // file:///./parser.mbty
-// 182|    non_empty_list_commas_rev(X) option(",") { $1.rev() }
+// 187|    non_empty_list_commas_rev(X) option(",") { $1.rev() }
 
 ///|
-fn yy_action_721(
+fn yy_action_733(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -23133,10 +23849,10 @@ fn yy_action_721(
 }
 
 // file:///./parser.mbty
-// 173|    X { @list.singleton($1) }
+// 178|    X { @list.singleton($1) }
 
 ///|
-fn yy_action_722(
+fn yy_action_734(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -23150,14 +23866,14 @@ fn yy_action_722(
 }
 
 // file:///./parser.mbty
-// 2048|    dotdot_binder ioption(",") { Open(@list.empty(), @list.empty(), $1) }
+// 2082|    dotdot_binder ioption(",") { Open(@list.empty(), @list.empty(), $1) }
 
 ///|
-fn yy_action_723(
+fn yy_action_735(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_490(_args[0].2, _args[1:2])
+  let _sub_action_0_result = yy_action_500(_args[0].2, _args[1:2])
   guard _args[0].0 is YYObj_DotDotBinder(_dollar1)
   YYObj_ArrayPatterns(
     {
@@ -23168,14 +23884,14 @@ fn yy_action_723(
 }
 
 // file:///./parser.mbty
-// 2048|    dotdot_binder ioption(",") { Open(@list.empty(), @list.empty(), $1) }
+// 2082|    dotdot_binder ioption(",") { Open(@list.empty(), @list.empty(), $1) }
 
 ///|
-fn yy_action_724(
+fn yy_action_736(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_488(_args[0].2, _args[1:1])
+  let _sub_action_0_result = yy_action_498(_args[0].2, _args[1:1])
   guard _args[0].0 is YYObj_DotDotBinder(_dollar1)
   YYObj_ArrayPatterns(
     {
@@ -23186,10 +23902,10 @@ fn yy_action_724(
 }
 
 // file:///./parser.mbty
-// 2039|     { Closed(@list.empty()) }
+// 2073|     { Closed(@list.empty()) }
 
 ///|
-fn yy_action_725(
+fn yy_action_737(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -23205,7 +23921,7 @@ fn yy_action_725(
 // 4|    { None }
 
 ///|
-fn yy_action_726(
+fn yy_action_738(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -23218,10 +23934,10 @@ fn yy_action_726(
 }
 
 // file:///./parser.mbty
-// 1353|    "(" separated_nonempty_list(",", lex_top_pattern) ")" { $2 }
+// 1372|    "(" separated_nonempty_list(",", lex_top_pattern) ")" { $2 }
 
 ///|
-fn yy_action_727(
+fn yy_action_739(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -23235,10 +23951,10 @@ fn yy_action_727(
 }
 
 // file:///./parser.mbty
-// 1359|    lex_as_pattern { Pattern($1) }
+// 1378|    lex_as_pattern { Pattern($1) }
 
 ///|
-fn yy_action_728(
+fn yy_action_740(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -23252,10 +23968,10 @@ fn yy_action_728(
 }
 
 // file:///./parser.mbty
-// 1360|    "_" { Wildcard(loc = mk_loc($sloc)) }
+// 1379|    "_" { Wildcard(loc = mk_loc($sloc)) }
 
 ///|
-fn yy_action_729(
+fn yy_action_741(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -23274,10 +23990,10 @@ fn yy_action_729(
 }
 
 // file:///./parser.mbty
-// 1361|    binder { Binder($1) }
+// 1380|    binder { Binder($1) }
 
 ///|
-fn yy_action_730(
+fn yy_action_742(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -23292,15 +24008,15 @@ fn yy_action_730(
 }
 
 // file:///./parser.mbty
-// 1364|    lex_pattern_sequence {
-// 1365|    match $1 {
-// 1366|      More(pat, tail=Empty) => pat
-// 1367|      _ => Sequence(pats=$1, loc=mk_loc($sloc))
-// 1368|    }
-// 1369|  }
+// 1383|    lex_pattern_sequence {
+// 1384|    match $1 {
+// 1385|      More(pat, tail=Empty) => pat
+// 1386|      _ => Sequence(pats=$1, loc=mk_loc($sloc))
+// 1387|    }
+// 1388|  }
 
 ///|
-fn yy_action_731(
+fn yy_action_743(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -23323,12 +24039,12 @@ fn yy_action_731(
 }
 
 // file:///./parser.mbty
-// 1370|    lex_atom_pattern "as" binder {
-// 1371|    Alias(pat = $1, binder = $3, loc = mk_loc($sloc))
-// 1372|  }
+// 1389|    lex_atom_pattern "as" binder {
+// 1390|    Alias(pat = $1, binder = $3, loc = mk_loc($sloc))
+// 1391|  }
 
 ///|
-fn yy_action_732(
+fn yy_action_744(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -23354,10 +24070,10 @@ fn yy_action_732(
 }
 
 // file:///./parser.mbty
-// 1376|    lex_atom_pattern option(SEMI) lex_pattern_sequence { @list.cons($1, $3) }
+// 1395|    lex_atom_pattern option(SEMI) lex_pattern_sequence { @list.cons($1, $3) }
 
 ///|
-fn yy_action_733(
+fn yy_action_745(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -23372,10 +24088,10 @@ fn yy_action_733(
 }
 
 // file:///./parser.mbty
-// 1375|    lex_atom_pattern { @list.singleton($1) }
+// 1394|    lex_atom_pattern { @list.singleton($1) }
 
 ///|
-fn yy_action_734(
+fn yy_action_746(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -23389,10 +24105,10 @@ fn yy_action_734(
 }
 
 // file:///./parser.mbty
-// 1379|    lex_simple_atom_pattern { $1 }
+// 1398|    lex_simple_atom_pattern { $1 }
 
 ///|
-fn yy_action_735(
+fn yy_action_747(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -23406,10 +24122,10 @@ fn yy_action_735(
 }
 
 // file:///./parser.mbty
-// 1380|    "(" lex_as_pattern ")" { $2 }
+// 1399|    "(" lex_as_pattern ")" { $2 }
 
 ///|
-fn yy_action_736(
+fn yy_action_748(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -23426,7 +24142,7 @@ fn yy_action_736(
 // 60|    X SEP separated_nonempty_list(SEP, X) { $3.add($1) }
 
 ///|
-fn yy_action_737(
+fn yy_action_749(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -23444,7 +24160,7 @@ fn yy_action_737(
 // 59|    X { @list.singleton($1) }
 
 ///|
-fn yy_action_738(
+fn yy_action_750(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -23458,10 +24174,10 @@ fn yy_action_738(
 }
 
 // file:///./parser.mbty
-// 1354|    "_" { @list.singleton(Wildcard(loc = mk_loc($sloc))) }
+// 1373|    "_" { @list.singleton(Wildcard(loc = mk_loc($sloc))) }
 
 ///|
-fn yy_action_739(
+fn yy_action_751(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -23480,10 +24196,10 @@ fn yy_action_739(
 }
 
 // file:///./parser.mbty
-// 1355|    binder { @list.singleton(Binder($1)) }
+// 1374|    binder { @list.singleton(Binder($1)) }
 
 ///|
-fn yy_action_740(
+fn yy_action_752(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -23498,7 +24214,7 @@ fn yy_action_740(
 }
 
 // file:///./parser.mbty
-// 1824|    LIDENT { Binder::{ name: $1, loc: mk_loc($sloc) } }
+// 1858|    LIDENT { Binder::{ name: $1, loc: mk_loc($sloc) } }
 
 ///|
 fn yy_action_16(
@@ -23521,10 +24237,10 @@ fn yy_action_16(
 }
 
 // file:///./parser.mbty
-// 1356|    lex_simple_atom_pattern { @list.singleton(Pattern($1)) }
+// 1375|    lex_simple_atom_pattern { @list.singleton(Pattern($1)) }
 
 ///|
-fn yy_action_741(
+fn yy_action_753(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -23538,12 +24254,12 @@ fn yy_action_741(
 }
 
 // file:///./parser.mbty
-// 1383|    REGEX_LITERAL {
-// 1384|    Regex(lit=$1, loc=mk_loc($sloc))
-// 1385|  }
+// 1402|    REGEX_LITERAL {
+// 1403|    Regex(lit=$1, loc=mk_loc($sloc))
+// 1404|  }
 
 ///|
-fn yy_action_742(
+fn yy_action_754(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -23563,12 +24279,12 @@ fn yy_action_742(
 }
 
 // file:///./parser.mbty
-// 1386|    REGEX_INTERP {
-// 1387|    RegexInterp(elems=make_interps($1), loc=mk_loc($sloc))
-// 1388|  }
+// 1405|    REGEX_INTERP {
+// 1406|    RegexInterp(elems=make_interps($1), loc=mk_loc($sloc))
+// 1407|  }
 
 ///|
-fn yy_action_743(
+fn yy_action_755(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -23591,12 +24307,12 @@ fn yy_action_743(
 }
 
 // file:///./parser.mbty
-// 1389|    STRING {
-// 1390|    Regex(lit = $1, loc = mk_loc($sloc))
-// 1391|  }
+// 1408|    STRING {
+// 1409|    Regex(lit = $1, loc = mk_loc($sloc))
+// 1410|  }
 
 ///|
-fn yy_action_744(
+fn yy_action_756(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -23616,12 +24332,12 @@ fn yy_action_744(
 }
 
 // file:///./parser.mbty
-// 1392|    INTERP {
-// 1393|    RegexInterp(elems = make_interps($1), loc = mk_loc($sloc))
-// 1394|  }
+// 1411|    INTERP {
+// 1412|    RegexInterp(elems = make_interps($1), loc = mk_loc($sloc))
+// 1413|  }
 
 ///|
-fn yy_action_745(
+fn yy_action_757(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -23644,16 +24360,16 @@ fn yy_action_745(
 }
 
 // file:///./parser.mbty
-// 1563|    range_expr "lexmatch?" lex_pattern "with" label {
-// 1564|    IsLexMatch(expr=$1, pat=$3, pat_loc=mk_loc($loc($3)), strategy = Some($5), loc=mk_loc($sloc))
-// 1565|  }
+// 1597|    range_expr "lexmatch?" lex_pattern "with" label {
+// 1598|    IsLexMatch(expr=$1, pat=$3, pat_loc=mk_loc($loc($3)), strategy = Some($5), loc=mk_loc($sloc))
+// 1599|  }
 
 ///|
-fn yy_action_746(
+fn yy_action_758(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_480(_args[3].2, _args[4:5])
+  let _sub_action_0_result = yy_action_490(_args[3].2, _args[4:5])
   guard _args[0].0 is YYObj_Expr(_dollar1)
   guard _args[2].0 is YYObj__list_List_LexTopPattern_(_dollar3)
   let _start_pos_of_item2 = _args[2].1
@@ -23680,12 +24396,12 @@ fn yy_action_746(
 }
 
 // file:///./parser.mbty
-// 1560|    range_expr "lexmatch?" lex_pattern %prec prec_LEXMATCH_QUESTION {
-// 1561|    IsLexMatch(expr=$1, pat=$3, pat_loc=mk_loc($loc($3)), strategy = None, loc=mk_loc($sloc))
-// 1562|  }
+// 1594|    range_expr "lexmatch?" lex_pattern %prec prec_LEXMATCH_QUESTION {
+// 1595|    IsLexMatch(expr=$1, pat=$3, pat_loc=mk_loc($loc($3)), strategy = None, loc=mk_loc($sloc))
+// 1596|  }
 
 ///|
-fn yy_action_747(
+fn yy_action_759(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -23714,10 +24430,10 @@ fn yy_action_747(
 }
 
 // file:///./parser.mbty
-// 1566|    range_expr { $1 }
+// 1600|    range_expr { $1 }
 
 ///|
-fn yy_action_748(
+fn yy_action_760(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -23731,17 +24447,17 @@ fn yy_action_748(
 }
 
 // file:///./parser.mbty
-// 1570|    prefix_expr "..<" prefix_expr { 
-// 1571|    Infix(
-// 1572|      op = Var::{ name: Ident(name = "..<"), loc: mk_loc($loc($2)) }, 
-// 1573|      lhs = $1, 
-// 1574|      rhs = $3, 
-// 1575|      loc = mk_loc($sloc)
-// 1576|    )
-// 1577|  }
+// 1604|    prefix_expr "..<" prefix_expr { 
+// 1605|    Infix(
+// 1606|      op = Var::{ name: Ident(name = "..<"), loc: mk_loc($loc($2)) }, 
+// 1607|      lhs = $1, 
+// 1608|      rhs = $3, 
+// 1609|      loc = mk_loc($sloc)
+// 1610|    )
+// 1611|  }
 
 ///|
-fn yy_action_749(
+fn yy_action_761(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -23772,17 +24488,17 @@ fn yy_action_749(
 }
 
 // file:///./parser.mbty
-// 1578|    prefix_expr "..=" prefix_expr { 
-// 1579|    Infix(
-// 1580|      op = Var::{ name: Ident(name = "..="), loc: mk_loc($loc($2)) }, 
-// 1581|      lhs = $1, 
-// 1582|      rhs = $3, 
-// 1583|      loc = mk_loc($sloc)
-// 1584|    )
-// 1585|  }
+// 1612|    prefix_expr "..=" prefix_expr { 
+// 1613|    Infix(
+// 1614|      op = Var::{ name: Ident(name = "..="), loc: mk_loc($loc($2)) }, 
+// 1615|      lhs = $1, 
+// 1616|      rhs = $3, 
+// 1617|      loc = mk_loc($sloc)
+// 1618|    )
+// 1619|  }
 
 ///|
-fn yy_action_750(
+fn yy_action_762(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -23813,17 +24529,17 @@ fn yy_action_750(
 }
 
 // file:///./parser.mbty
-// 1586|    prefix_expr "..<=" prefix_expr {
-// 1587|    Infix(
-// 1588|      op = Var::{ name: Ident(name = "..<="), loc: mk_loc($loc($2)) }, 
-// 1589|      lhs = $1, 
-// 1590|      rhs = $3, 
-// 1591|      loc = mk_loc($sloc)
-// 1592|    )
-// 1593|  }
+// 1620|    prefix_expr "..<=" prefix_expr {
+// 1621|    Infix(
+// 1622|      op = Var::{ name: Ident(name = "..<="), loc: mk_loc($loc($2)) }, 
+// 1623|      lhs = $1, 
+// 1624|      rhs = $3, 
+// 1625|      loc = mk_loc($sloc)
+// 1626|    )
+// 1627|  }
 
 ///|
-fn yy_action_751(
+fn yy_action_763(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -23854,17 +24570,17 @@ fn yy_action_751(
 }
 
 // file:///./parser.mbty
-// 1594|    prefix_expr ">=.." prefix_expr {
-// 1595|    Infix(
-// 1596|      op = Var::{ name: Ident(name = ">=.."), loc: mk_loc($loc($2)) }, 
-// 1597|      lhs = $1, 
-// 1598|      rhs = $3, 
-// 1599|      loc = mk_loc($sloc)
-// 1600|    )
-// 1601|  }
+// 1628|    prefix_expr ">=.." prefix_expr {
+// 1629|    Infix(
+// 1630|      op = Var::{ name: Ident(name = ">=.."), loc: mk_loc($loc($2)) }, 
+// 1631|      lhs = $1, 
+// 1632|      rhs = $3, 
+// 1633|      loc = mk_loc($sloc)
+// 1634|    )
+// 1635|  }
 
 ///|
-fn yy_action_752(
+fn yy_action_764(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -23895,17 +24611,17 @@ fn yy_action_752(
 }
 
 // file:///./parser.mbty
-// 1602|    prefix_expr ">.." prefix_expr {
-// 1603|    Infix(
-// 1604|      op = Var::{ name: Ident(name = ">.."), loc: mk_loc($loc($2)) }, 
-// 1605|      lhs = $1, 
-// 1606|      rhs = $3, 
-// 1607|      loc = mk_loc($sloc)
-// 1608|    )
-// 1609|  }
+// 1636|    prefix_expr ">.." prefix_expr {
+// 1637|    Infix(
+// 1638|      op = Var::{ name: Ident(name = ">.."), loc: mk_loc($loc($2)) }, 
+// 1639|      lhs = $1, 
+// 1640|      rhs = $3, 
+// 1641|      loc = mk_loc($sloc)
+// 1642|    )
+// 1643|  }
 
 ///|
-fn yy_action_753(
+fn yy_action_765(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -23936,10 +24652,10 @@ fn yy_action_753(
 }
 
 // file:///./parser.mbty
-// 1610|    prefix_expr { $1 }
+// 1644|    prefix_expr { $1 }
 
 ///|
-fn yy_action_754(
+fn yy_action_766(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -23953,16 +24669,16 @@ fn yy_action_754(
 }
 
 // file:///./parser.mbty
-// 1753|    LIDENT "?" "(" list_commas(argument) ")" { 
-// 1754|    let func = @syntax.make_ident_expr(
-// 1755|      loc = mk_loc($loc($1)), 
-// 1756|      Var::{ name: Ident(name = $1), loc: mk_loc($loc($1)) }
-// 1757|    )
-// 1758|    Apply(func~, args = $4, attr = Question, loc = mk_loc($sloc))
-// 1759|  }
+// 1787|    LIDENT "?" "(" list_commas(argument) ")" { 
+// 1788|    let func = @syntax.make_ident_expr(
+// 1789|      loc = mk_loc($loc($1)), 
+// 1790|      Var::{ name: Ident(name = $1), loc: mk_loc($loc($1)) }
+// 1791|    )
+// 1792|    Apply(func~, args = $4, attr = Question, loc = mk_loc($sloc))
+// 1793|  }
 
 ///|
-fn yy_action_755(
+fn yy_action_767(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -23997,10 +24713,10 @@ fn yy_action_755(
 }
 
 // file:///./parser.mbty
-// 191|    non_empty_list_commas(X) { $1 }
+// 196|    non_empty_list_commas(X) { $1 }
 
 ///|
-fn yy_action_756(
+fn yy_action_768(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -24014,10 +24730,10 @@ fn yy_action_756(
 }
 
 // file:///./parser.mbty
-// 1080|    LIDENT %prec prec_apply_non_ident_fn { Ident(name = $1) }
+// 1089|    LIDENT %prec prec_apply_non_ident_fn { Ident(name = $1) }
 
 ///|
-fn yy_action_757(
+fn yy_action_769(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -24031,10 +24747,10 @@ fn yy_action_757(
 }
 
 // file:///./parser.mbty
-// 1081|    PACKAGE_NAME DOT_LIDENT { Dot(pkg = $1, id = $2) }
+// 1090|    PACKAGE_NAME DOT_LIDENT { Dot(pkg = $1, id = $2) }
 
 ///|
-fn yy_action_758(
+fn yy_action_770(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -24049,16 +24765,16 @@ fn yy_action_758(
 }
 
 // file:///./parser.mbty
-// 1642|    PACKAGE_NAME DOT_UIDENT { 
-// 1643|    Constructor::{
-// 1644|      name: ConstrName::{ name: $2, loc: mk_loc($loc($2)) },
-// 1645|      extra_info: Package($1),
-// 1646|      loc: mk_loc($sloc)
-// 1647|    }
-// 1648|  }
+// 1676|    PACKAGE_NAME DOT_UIDENT { 
+// 1677|    Constructor::{
+// 1678|      name: ConstrName::{ name: $2, loc: mk_loc($loc($2)) },
+// 1679|      extra_info: Package($1),
+// 1680|      loc: mk_loc($sloc)
+// 1681|    }
+// 1682|  }
 
 ///|
-fn yy_action_759(
+fn yy_action_771(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -24088,16 +24804,16 @@ fn yy_action_759(
 }
 
 // file:///./parser.mbty
-// 1635|    UIDENT { 
-// 1636|    Constructor::{
-// 1637|      name: ConstrName::{ name: $1, loc: mk_loc($loc($1)) },
-// 1638|      extra_info: NoExtraInfo,
-// 1639|      loc: mk_loc($sloc)
-// 1640|    }
-// 1641|  }
+// 1669|    UIDENT { 
+// 1670|    Constructor::{
+// 1671|      name: ConstrName::{ name: $1, loc: mk_loc($loc($1)) },
+// 1672|      extra_info: NoExtraInfo,
+// 1673|      loc: mk_loc($sloc)
+// 1674|    }
+// 1675|  }
 
 ///|
-fn yy_action_760(
+fn yy_action_772(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -24126,14 +24842,14 @@ fn yy_action_760(
 }
 
 // file:///./parser.mbty
-// 1614|    id(plus) prefix_expr { make_uplus(loc = mk_loc($sloc), $1, $2) }
+// 1648|    id(plus) prefix_expr { make_uplus(loc = mk_loc($sloc), $1, $2) }
 
 ///|
-fn yy_action_761(
+fn yy_action_773(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_762(_last_pos, _args[0:1])
+  let _sub_action_0_result = yy_action_774(_last_pos, _args[0:1])
   let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
   let _end_pos = if _args.length() == 0 {
     _last_pos
@@ -24151,14 +24867,14 @@ fn yy_action_761(
 }
 
 // file:///./parser.mbty
-// 239|    X { $1 }
+// 244|    X { $1 }
 
 ///|
-fn yy_action_762(
+fn yy_action_774(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_763(_last_pos, _args[0:1])
+  let _sub_action_0_result = yy_action_775(_last_pos, _args[0:1])
   guard _sub_action_0_result is YYObj_String(_dollar1)
   YYObj_String(
     {
@@ -24169,10 +24885,10 @@ fn yy_action_762(
 }
 
 // file:///./parser.mbty
-// 1621|    PLUS { "+" }
+// 1655|    PLUS { "+" }
 
 ///|
-fn yy_action_763(
+fn yy_action_775(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -24185,14 +24901,14 @@ fn yy_action_763(
 }
 
 // file:///./parser.mbty
-// 1615|    id(minus) prefix_expr { make_uminus(loc = mk_loc($sloc), $1, $2) }
+// 1649|    id(minus) prefix_expr { make_uminus(loc = mk_loc($sloc), $1, $2) }
 
 ///|
-fn yy_action_764(
+fn yy_action_776(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_765(_last_pos, _args[0:1])
+  let _sub_action_0_result = yy_action_777(_last_pos, _args[0:1])
   let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
   let _end_pos = if _args.length() == 0 {
     _last_pos
@@ -24210,14 +24926,14 @@ fn yy_action_764(
 }
 
 // file:///./parser.mbty
-// 239|    X { $1 }
+// 244|    X { $1 }
 
 ///|
-fn yy_action_765(
+fn yy_action_777(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_766(_last_pos, _args[0:1])
+  let _sub_action_0_result = yy_action_778(_last_pos, _args[0:1])
   guard _sub_action_0_result is YYObj_String(_dollar1)
   YYObj_String(
     {
@@ -24228,10 +24944,10 @@ fn yy_action_765(
 }
 
 // file:///./parser.mbty
-// 1625|    MINUS { "-" }
+// 1659|    MINUS { "-" }
 
 ///|
-fn yy_action_766(
+fn yy_action_778(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -24244,14 +24960,14 @@ fn yy_action_766(
 }
 
 // file:///./parser.mbty
-// 1665|    expr ioption(",") ")" { @list.singleton($1) }
+// 1699|    expr ioption(",") ")" { @list.singleton($1) }
 
 ///|
-fn yy_action_767(
+fn yy_action_779(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_488(_args[0].2, _args[1:1])
+  let _sub_action_0_result = yy_action_498(_args[0].2, _args[1:1])
   guard _args[0].0 is YYObj_Expr(_dollar1)
   YYObj_List_Expr_(
     {
@@ -24265,7 +24981,7 @@ fn yy_action_767(
 // 9|    { None }
 
 ///|
-fn yy_action_488(
+fn yy_action_498(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -24278,14 +24994,14 @@ fn yy_action_488(
 }
 
 // file:///./parser.mbty
-// 1665|    expr ioption(",") ")" { @list.singleton($1) }
+// 1699|    expr ioption(",") ")" { @list.singleton($1) }
 
 ///|
-fn yy_action_768(
+fn yy_action_780(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_490(_args[0].2, _args[1:2])
+  let _sub_action_0_result = yy_action_500(_args[0].2, _args[1:2])
   guard _args[0].0 is YYObj_Expr(_dollar1)
   YYObj_List_Expr_(
     {
@@ -24299,7 +25015,7 @@ fn yy_action_768(
 // 10|    X { Some($1) }
 
 ///|
-fn yy_action_490(
+fn yy_action_500(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -24313,10 +25029,10 @@ fn yy_action_490(
 }
 
 // file:///./parser.mbty
-// 1666|    expr "," non_empty_tuple_elems { $3.add($1) }
+// 1700|    expr "," non_empty_tuple_elems { $3.add($1) }
 
 ///|
-fn yy_action_769(
+fn yy_action_781(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -24331,10 +25047,10 @@ fn yy_action_769(
 }
 
 // file:///./parser.mbty
-// 1696|    "(" expr ":" type_ ")" { Constraint(expr = $2, ty = $4, loc = mk_loc($sloc)) }
+// 1730|    "(" expr ":" type_ ")" { Constraint(expr = $2, ty = $4, loc = mk_loc($sloc)) }
 
 ///|
-fn yy_action_770(
+fn yy_action_782(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -24359,10 +25075,10 @@ fn yy_action_770(
 }
 
 // file:///./parser.mbty
-// 1672|    non_empty_tuple_elems { $1 }
+// 1706|    non_empty_tuple_elems { $1 }
 
 ///|
-fn yy_action_771(
+fn yy_action_783(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -24376,21 +25092,21 @@ fn yy_action_771(
 }
 
 // file:///./parser.mbty
-// 1676|    "(" arrow_fn_prefix_no_constraint { 
-// 1677|    let es = $2.map(@syntax.arrow_fn_param_to_expr)
-// 1678|    match es {
-// 1679|      @list.More(expr, tail=Empty) => {
-// 1680|        match expr {
-// 1681|          Constraint(..) => expr
-// 1682|          _ => Group(expr~, group = Paren, loc = mk_loc($sloc))
-// 1683|        }
-// 1684|      }
-// 1685|      _ => @syntax.make_tuple_expr(loc = mk_loc($sloc), es)
-// 1686|    }
-// 1687|  }
+// 1710|    "(" arrow_fn_prefix_no_constraint { 
+// 1711|    let es = $2.map(@syntax.arrow_fn_param_to_expr)
+// 1712|    match es {
+// 1713|      @list.More(expr, tail=Empty) => {
+// 1714|        match expr {
+// 1715|          Constraint(..) => expr
+// 1716|          _ => Group(expr~, group = Paren, loc = mk_loc($sloc))
+// 1717|        }
+// 1718|      }
+// 1719|      _ => @syntax.make_tuple_expr(loc = mk_loc($sloc), es)
+// 1720|    }
+// 1721|  }
 
 ///|
-fn yy_action_772(
+fn yy_action_784(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -24424,15 +25140,15 @@ fn yy_action_772(
 }
 
 // file:///./parser.mbty
-// 1688|    "(" non_empty_tuple_elems_with_prefix { 
-// 1689|    match $2 {
-// 1690|      More(expr, tail=Empty) => Group(expr~, group = Paren, loc = mk_loc($sloc))
-// 1691|      exprs => @syntax.make_tuple_expr(loc = mk_loc($sloc), exprs)
-// 1692|    }
-// 1693|  }
+// 1722|    "(" non_empty_tuple_elems_with_prefix { 
+// 1723|    match $2 {
+// 1724|      More(expr, tail=Empty) => Group(expr~, group = Paren, loc = mk_loc($sloc))
+// 1725|      exprs => @syntax.make_tuple_expr(loc = mk_loc($sloc), exprs)
+// 1726|    }
+// 1727|  }
 
 ///|
-fn yy_action_773(
+fn yy_action_785(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -24460,10 +25176,10 @@ fn yy_action_773(
 }
 
 // file:///./parser.mbty
-// 1697|    "(" ")" { Unit(loc = mk_loc($sloc), faked = false) }
+// 1731|    "(" ")" { Unit(loc = mk_loc($sloc), faked = false) }
 
 ///|
-fn yy_action_774(
+fn yy_action_786(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -24482,10 +25198,10 @@ fn yy_action_774(
 }
 
 // file:///./parser.mbty
-// 1750|    "_" %prec prec_lower_than_arrow_fn { Hole(loc = mk_loc($sloc), kind = Incomplete) }
+// 1784|    "_" %prec prec_lower_than_arrow_fn { Hole(loc = mk_loc($sloc), kind = Incomplete) }
 
 ///|
-fn yy_action_775(
+fn yy_action_787(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -24504,10 +25220,10 @@ fn yy_action_775(
 }
 
 // file:///./parser.mbty
-// 1923|    expr { Argument::{ value: $1, kind: Positional } }
+// 1957|    expr { Argument::{ value: $1, kind: Positional } }
 
 ///|
-fn yy_action_776(
+fn yy_action_788(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -24521,10 +25237,10 @@ fn yy_action_776(
 }
 
 // file:///./parser.mbty
-// 174|    non_empty_list_commas_rev(X) "," X { $1.add($3) }
+// 179|    non_empty_list_commas_rev(X) "," X { $1.add($3) }
 
 ///|
-fn yy_action_777(
+fn yy_action_789(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -24539,10 +25255,10 @@ fn yy_action_777(
 }
 
 // file:///./parser.mbty
-// 182|    non_empty_list_commas_rev(X) option(",") { $1.rev() }
+// 187|    non_empty_list_commas_rev(X) option(",") { $1.rev() }
 
 ///|
-fn yy_action_778(
+fn yy_action_790(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -24556,10 +25272,10 @@ fn yy_action_778(
 }
 
 // file:///./parser.mbty
-// 173|    X { @list.singleton($1) }
+// 178|    X { @list.singleton($1) }
 
 ///|
-fn yy_action_779(
+fn yy_action_791(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -24573,10 +25289,10 @@ fn yy_action_779(
 }
 
 // file:///./parser.mbty
-// 190|    { @list.empty() }
+// 195|    { @list.empty() }
 
 ///|
-fn yy_action_780(
+fn yy_action_792(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -24589,16 +25305,16 @@ fn yy_action_780(
 }
 
 // file:///./parser.mbty
-// 1797|    simple_expr accessor %prec prec_field { 
-// 1798|    Field(record = $1, accessor = $2, loc = mk_loc($sloc))
-// 1799|  }
+// 1831|    simple_expr accessor %prec prec_field { 
+// 1832|    Field(record = $1, accessor = $2, loc = mk_loc($sloc))
+// 1833|  }
 
 ///|
-fn yy_action_781(
+fn yy_action_793(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_471(_args[0].2, _args[1:2])
+  let _sub_action_0_result = yy_action_481(_args[0].2, _args[1:2])
   guard _args[0].0 is YYObj_Expr(_dollar1)
   guard _sub_action_0_result is YYObj_Accessor(_dollar2)
   let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
@@ -24620,10 +25336,10 @@ fn yy_action_781(
 }
 
 // file:///./parser.mbty
-// 1820|    DOT_INT { Index(tuple_index = $1, loc = mk_loc($sloc)) }
+// 1854|    DOT_INT { Index(tuple_index = $1, loc = mk_loc($sloc)) }
 
 ///|
-fn yy_action_471(
+fn yy_action_481(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -24643,10 +25359,10 @@ fn yy_action_471(
 }
 
 // file:///./parser.mbty
-// 1617|    simple_expr { $1 }
+// 1651|    simple_expr { $1 }
 
 ///|
-fn yy_action_782(
+fn yy_action_794(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -24660,13 +25376,13 @@ fn yy_action_782(
 }
 
 // file:///./parser.mbty
-// 253|    POST_LABEL opt_annot {
-// 254|      let binder = Binder::{ name: $1, loc: mk_loc($loc($1)).trim_last_char() }
-// 255|      Labelled(binder~, ty = $2)
-// 256|    }
+// 258|    POST_LABEL opt_annot {
+// 259|      let binder = Binder::{ name: $1, loc: mk_loc($loc($1)).trim_last_char() }
+// 260|      Labelled(binder~, ty = $2)
+// 261|    }
 
 ///|
-fn yy_action_783(
+fn yy_action_795(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -24688,14 +25404,14 @@ fn yy_action_783(
 }
 
 // file:///./parser.mbty
-// 247|    ioption(annot) { $1 }
+// 252|    ioption(annot) { $1 }
 
 ///|
 fn yy_action_19(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_784(_last_pos, _args[0:0])
+  let _sub_action_0_result = yy_action_796(_last_pos, _args[0:0])
   guard _sub_action_0_result is YYObj_Option_Type_(_dollar1)
   YYObj_Type_(
     {
@@ -24709,7 +25425,7 @@ fn yy_action_19(
 // 9|    { None }
 
 ///|
-fn yy_action_784(
+fn yy_action_796(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -24722,10 +25438,10 @@ fn yy_action_784(
 }
 
 // file:///./parser.mbty
-// 174|    non_empty_list_commas_rev(X) "," X { $1.add($3) }
+// 179|    non_empty_list_commas_rev(X) "," X { $1.add($3) }
 
 ///|
-fn yy_action_785(
+fn yy_action_797(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -24740,10 +25456,10 @@ fn yy_action_785(
 }
 
 // file:///./parser.mbty
-// 182|    non_empty_list_commas_rev(X) option(",") { $1.rev() }
+// 187|    non_empty_list_commas_rev(X) option(",") { $1.rev() }
 
 ///|
-fn yy_action_786(
+fn yy_action_798(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -24757,10 +25473,10 @@ fn yy_action_786(
 }
 
 // file:///./parser.mbty
-// 173|    X { @list.singleton($1) }
+// 178|    X { @list.singleton($1) }
 
 ///|
-fn yy_action_787(
+fn yy_action_799(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -24774,10 +25490,10 @@ fn yy_action_787(
 }
 
 // file:///./parser.mbty
-// 190|    { @list.empty() }
+// 195|    { @list.empty() }
 
 ///|
-fn yy_action_788(
+fn yy_action_800(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -24790,23 +25506,23 @@ fn yy_action_788(
 }
 
 // file:///./parser.mbty
-// 1701|    is_async "fn" optional_bang parameters func_return_type block_expr { 
-// 1702|    let (return_type, error_type) = $5
-// 1703|    Func::{
-// 1704|      parameters : $4,
-// 1705|      params_loc : mk_loc($loc($4)),
-// 1706|      body : $6,
-// 1707|      return_type,
-// 1708|      error_type,
-// 1709|      kind : Lambda,
-// 1710|      has_error : $3,
-// 1711|      is_async : $1,
-// 1712|      loc : mk_loc($sloc)
-// 1713|    }
-// 1714|  }
+// 1735|    is_async "fn" optional_bang parameters func_return_type block_expr { 
+// 1736|    let (return_type, error_type) = $5
+// 1737|    Func::{
+// 1738|      parameters : $4,
+// 1739|      params_loc : mk_loc($loc($4)),
+// 1740|      body : $6,
+// 1741|      return_type,
+// 1742|      error_type,
+// 1743|      kind : Lambda,
+// 1744|      has_error : $3,
+// 1745|      is_async : $1,
+// 1746|      loc : mk_loc($sloc)
+// 1747|    }
+// 1748|  }
 
 ///|
-fn yy_action_789(
+fn yy_action_801(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -24844,14 +25560,14 @@ fn yy_action_789(
 }
 
 // file:///./parser.mbty
-// 2196|    labeled_expr { $1 }
+// 2264|    labeled_expr { $1 }
 
 ///|
-fn yy_action_790(
+fn yy_action_802(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_398(_last_pos, _args[0:3])
+  let _sub_action_0_result = yy_action_408(_last_pos, _args[0:3])
   guard _sub_action_0_result is YYObj_FieldDef(_dollar1)
   YYObj_FieldDef(
     {
@@ -24862,14 +25578,14 @@ fn yy_action_790(
 }
 
 // file:///./parser.mbty
-// 2201|    label ":" expr { @syntax.make_field_def(loc = mk_loc($sloc), $1, $3, false) }
+// 2269|    label ":" expr { @syntax.make_field_def(loc = mk_loc($sloc), $1, $3, false) }
 
 ///|
-fn yy_action_398(
+fn yy_action_408(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_480(_last_pos, _args[0:1])
+  let _sub_action_0_result = yy_action_490(_last_pos, _args[0:1])
   let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
   let _end_pos = if _args.length() == 0 {
     _last_pos
@@ -24892,14 +25608,14 @@ fn yy_action_398(
 }
 
 // file:///./parser.mbty
-// 2197|   label_pun { $1 }
+// 2265|   label_pun { $1 }
 
 ///|
-fn yy_action_791(
+fn yy_action_803(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_396(_last_pos, _args[0:1])
+  let _sub_action_0_result = yy_action_406(_last_pos, _args[0:1])
   guard _sub_action_0_result is YYObj_FieldDef(_dollar1)
   YYObj_FieldDef(
     {
@@ -24910,14 +25626,14 @@ fn yy_action_791(
 }
 
 // file:///./parser.mbty
-// 2205|    label { @syntax.make_field_def(loc = mk_loc($sloc), $1, @syntax.label_to_expr(loc = mk_loc($sloc), $1), true) }
+// 2273|    label { @syntax.make_field_def(loc = mk_loc($sloc), $1, @syntax.label_to_expr(loc = mk_loc($sloc), $1), true) }
 
 ///|
-fn yy_action_396(
+fn yy_action_406(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_480(_last_pos, _args[0:1])
+  let _sub_action_0_result = yy_action_490(_last_pos, _args[0:1])
   let _symbol_start_pos = _get_symbol_start_pos(_args, _last_pos)
   let _end_pos = if _args.length() == 0 {
     _last_pos
@@ -24942,10 +25658,10 @@ fn yy_action_396(
 }
 
 // file:///./parser.mbty
-// 1809|    LIDENT { Label::{ name: $1, loc: mk_loc($sloc) } }
+// 1843|    LIDENT { Label::{ name: $1, loc: mk_loc($sloc) } }
 
 ///|
-fn yy_action_480(
+fn yy_action_490(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -24965,10 +25681,10 @@ fn yy_action_480(
 }
 
 // file:///./parser.mbty
-// 174|    non_empty_list_commas_rev(X) "," X { $1.add($3) }
+// 179|    non_empty_list_commas_rev(X) "," X { $1.add($3) }
 
 ///|
-fn yy_action_792(
+fn yy_action_804(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -24983,12 +25699,12 @@ fn yy_action_792(
 }
 
 // file:///./parser.mbty
-// 200|    non_empty_list_commas_rev(X) option(",") { 
-// 201|    ($1.rev(), $2 is Some(_)) 
-// 202|  }
+// 205|    non_empty_list_commas_rev(X) option(",") { 
+// 206|    ($1.rev(), $2 is Some(_)) 
+// 207|  }
 
 ///|
-fn yy_action_793(
+fn yy_action_805(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -25003,10 +25719,10 @@ fn yy_action_793(
 }
 
 // file:///./parser.mbty
-// 173|    X { @list.singleton($1) }
+// 178|    X { @list.singleton($1) }
 
 ///|
-fn yy_action_794(
+fn yy_action_806(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -25020,10 +25736,10 @@ fn yy_action_794(
 }
 
 // file:///./parser.mbty
-// 206|    { (@list.empty(), false) }
+// 211|    { (@list.empty(), false) }
 
 ///|
-fn yy_action_795(
+fn yy_action_807(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -25036,13 +25752,13 @@ fn yy_action_795(
 }
 
 // file:///./parser.mbty
-// 1800|    type_name "::" LIDENT { 
-// 1801|    let method_name = Label::{ name: $3, loc: mk_loc($loc($3)) }
-// 1802|    Method(type_name = $1, method_name~, loc = mk_loc($sloc))
-// 1803|  }
+// 1834|    type_name "::" LIDENT { 
+// 1835|    let method_name = Label::{ name: $3, loc: mk_loc($loc($3)) }
+// 1836|    Method(type_name = $1, method_name~, loc = mk_loc($sloc))
+// 1837|  }
 
 ///|
-fn yy_action_796(
+fn yy_action_808(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -25073,10 +25789,10 @@ fn yy_action_796(
 }
 
 // file:///./parser.mbty
-// 212|    non_empty_list_semi_rev_aux(X) SEMI X { $1.add($3) }
+// 217|    non_empty_list_semi_rev_aux(X) SEMI X { $1.add($3) }
 
 ///|
-fn yy_action_797(
+fn yy_action_809(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -25094,7 +25810,7 @@ fn yy_action_797(
 // 5|    X { Some($1) }
 
 ///|
-fn yy_action_798(
+fn yy_action_810(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -25108,10 +25824,10 @@ fn yy_action_798(
 }
 
 // file:///./parser.mbty
-// 216|    non_empty_list_semi_rev_aux(X) option(SEMI) { $1 }
+// 221|    non_empty_list_semi_rev_aux(X) option(SEMI) { $1 }
 
 ///|
-fn yy_action_799(
+fn yy_action_811(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -25128,7 +25844,7 @@ fn yy_action_799(
 // 4|    { None }
 
 ///|
-fn yy_action_800(
+fn yy_action_812(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -25141,10 +25857,10 @@ fn yy_action_800(
 }
 
 // file:///./parser.mbty
-// 211|    X { @list.singleton($1) }
+// 216|    X { @list.singleton($1) }
 
 ///|
-fn yy_action_801(
+fn yy_action_813(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -25158,10 +25874,10 @@ fn yy_action_801(
 }
 
 // file:///./parser.mbty
-// 229|    { @list.empty() }
+// 234|    { @list.empty() }
 
 ///|
-fn yy_action_802(
+fn yy_action_814(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -25174,23 +25890,23 @@ fn yy_action_802(
 }
 
 // file:///./parser.mbty
-// 1701|    is_async "fn" optional_bang parameters func_return_type block_expr { 
-// 1702|    let (return_type, error_type) = $5
-// 1703|    Func::{
-// 1704|      parameters : $4,
-// 1705|      params_loc : mk_loc($loc($4)),
-// 1706|      body : $6,
-// 1707|      return_type,
-// 1708|      error_type,
-// 1709|      kind : Lambda,
-// 1710|      has_error : $3,
-// 1711|      is_async : $1,
-// 1712|      loc : mk_loc($sloc)
-// 1713|    }
-// 1714|  }
+// 1735|    is_async "fn" optional_bang parameters func_return_type block_expr { 
+// 1736|    let (return_type, error_type) = $5
+// 1737|    Func::{
+// 1738|      parameters : $4,
+// 1739|      params_loc : mk_loc($loc($4)),
+// 1740|      body : $6,
+// 1741|      return_type,
+// 1742|      error_type,
+// 1743|      kind : Lambda,
+// 1744|      has_error : $3,
+// 1745|      is_async : $1,
+// 1746|      loc : mk_loc($sloc)
+// 1747|    }
+// 1748|  }
 
 ///|
-fn yy_action_803(
+fn yy_action_815(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -25228,14 +25944,14 @@ fn yy_action_803(
 }
 
 // file:///./parser.mbty
-// 2074|    "->" return_type { 
-// 2075|    match $2 {
-// 2076|      (ty, err) => (Some(ty), err)
-// 2077|    }
-// 2078|  }
+// 2108|    "->" return_type { 
+// 2109|    match $2 {
+// 2110|      (ty, err) => (Some(ty), err)
+// 2111|    }
+// 2112|  }
 
 ///|
-fn yy_action_804(
+fn yy_action_816(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -25251,22 +25967,22 @@ fn yy_action_804(
 }
 
 // file:///./parser.mbty
-// 2111|    is_async "(" type_ "," ioption(non_empty_list_commas(type_)) ")" "->" return_type { 
-// 2112|    let (ty_res, ty_err) = $8
-// 2113|    let ts = match $5 { 
-// 2114|      None => @list.empty() 
-// 2115|      Some(ts) => ts 
-// 2116|    }
-// 2117|    Arrow(args = ts.add($3), res = ty_res, err = ty_err, is_async = $1, loc = mk_loc($sloc))
-// 2118|  }
+// 2145|    is_async "(" type_ "," ioption(non_empty_list_commas(type_)) ")" "->" return_type { 
+// 2146|    let (ty_res, ty_err) = $8
+// 2147|    let ts = match $5 { 
+// 2148|      None => @list.empty() 
+// 2149|      Some(ts) => ts 
+// 2150|    }
+// 2151|    Arrow(args = ts.add($3), res = ty_res, err = ty_err, is_async = $1, loc = mk_loc($sloc))
+// 2152|  }
 
 ///|
-fn yy_action_805(
+fn yy_action_817(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
   let _sub_action_0_result = yy_action_5(_last_pos, _args[0:1])
-  let _sub_action_1_result = yy_action_806(_args[3].2, _args[4:4])
+  let _sub_action_1_result = yy_action_818(_args[3].2, _args[4:4])
   guard _args[6].0 is YYObj__Type__ErrorType_(_dollar8)
   guard _sub_action_1_result is YYObj_Option_List_Type__(_dollar5)
   guard _args[2].0 is YYObj_Type(_dollar3)
@@ -25297,22 +26013,22 @@ fn yy_action_805(
 }
 
 // file:///./parser.mbty
-// 2111|    is_async "(" type_ "," ioption(non_empty_list_commas(type_)) ")" "->" return_type { 
-// 2112|    let (ty_res, ty_err) = $8
-// 2113|    let ts = match $5 { 
-// 2114|      None => @list.empty() 
-// 2115|      Some(ts) => ts 
-// 2116|    }
-// 2117|    Arrow(args = ts.add($3), res = ty_res, err = ty_err, is_async = $1, loc = mk_loc($sloc))
-// 2118|  }
+// 2145|    is_async "(" type_ "," ioption(non_empty_list_commas(type_)) ")" "->" return_type { 
+// 2146|    let (ty_res, ty_err) = $8
+// 2147|    let ts = match $5 { 
+// 2148|      None => @list.empty() 
+// 2149|      Some(ts) => ts 
+// 2150|    }
+// 2151|    Arrow(args = ts.add($3), res = ty_res, err = ty_err, is_async = $1, loc = mk_loc($sloc))
+// 2152|  }
 
 ///|
-fn yy_action_807(
+fn yy_action_819(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
   let _sub_action_0_result = yy_action_5(_last_pos, _args[0:1])
-  let _sub_action_1_result = yy_action_808(_args[3].2, _args[4:5])
+  let _sub_action_1_result = yy_action_820(_args[3].2, _args[4:5])
   guard _args[7].0 is YYObj__Type__ErrorType_(_dollar8)
   guard _sub_action_1_result is YYObj_Option_List_Type__(_dollar5)
   guard _args[2].0 is YYObj_Type(_dollar3)
@@ -25343,13 +26059,13 @@ fn yy_action_807(
 }
 
 // file:///./parser.mbty
-// 2123|    is_async "(" type_ ")" "->" return_type { 
-// 2124|    let (ty_res, ty_err) = $6
-// 2125|    Arrow(args = @list.singleton($3), res = ty_res, err = ty_err, is_async = $1, loc = mk_loc($sloc))
-// 2126|  }
+// 2157|    is_async "(" type_ ")" "->" return_type { 
+// 2158|    let (ty_res, ty_err) = $6
+// 2159|    Arrow(args = @list.singleton($3), res = ty_res, err = ty_err, is_async = $1, loc = mk_loc($sloc))
+// 2160|  }
 
 ///|
-fn yy_action_809(
+fn yy_action_821(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -25379,21 +26095,21 @@ fn yy_action_809(
 }
 
 // file:///./parser.mbty
-// 2098|    qual_ident_ty_inline optional_type_arguments %prec prec_lower_than_as { 
-// 2099|    Name(
-// 2100|      constr_id = ConstrId::{ id: $1, loc: mk_loc($loc($1)) },
-// 2101|      tys = $2,
-// 2102|      loc = mk_loc($sloc)
-// 2103|    )
-// 2104|  }
+// 2132|    qual_ident_ty_inline optional_type_arguments %prec prec_lower_than_as { 
+// 2133|    Name(
+// 2134|      constr_id = ConstrId::{ id: $1, loc: mk_loc($loc($1)) },
+// 2135|      tys = $2,
+// 2136|      loc = mk_loc($sloc)
+// 2137|    )
+// 2138|  }
 
 ///|
-fn yy_action_810(
+fn yy_action_822(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_811(_last_pos, _args[0:2])
-  let _sub_action_1_result = yy_action_812(_args[1].2, _args[2:5])
+  let _sub_action_0_result = yy_action_823(_last_pos, _args[0:2])
+  let _sub_action_1_result = yy_action_824(_args[1].2, _args[2:5])
   guard _sub_action_0_result is YYObj_LongIdent(_dollar1)
   let _start_pos_of_item0 = _args[0].1
   let _end_pos_of_item0 = _args[0].2
@@ -25420,21 +26136,21 @@ fn yy_action_810(
 }
 
 // file:///./parser.mbty
-// 2098|    qual_ident_ty_inline optional_type_arguments %prec prec_lower_than_as { 
-// 2099|    Name(
-// 2100|      constr_id = ConstrId::{ id: $1, loc: mk_loc($loc($1)) },
-// 2101|      tys = $2,
-// 2102|      loc = mk_loc($sloc)
-// 2103|    )
-// 2104|  }
+// 2132|    qual_ident_ty_inline optional_type_arguments %prec prec_lower_than_as { 
+// 2133|    Name(
+// 2134|      constr_id = ConstrId::{ id: $1, loc: mk_loc($loc($1)) },
+// 2135|      tys = $2,
+// 2136|      loc = mk_loc($sloc)
+// 2137|    )
+// 2138|  }
 
 ///|
-fn yy_action_813(
+fn yy_action_825(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_811(_last_pos, _args[0:2])
-  let _sub_action_1_result = yy_action_814(_args[1].2, _args[2:2])
+  let _sub_action_0_result = yy_action_823(_last_pos, _args[0:2])
+  let _sub_action_1_result = yy_action_826(_args[1].2, _args[2:2])
   guard _sub_action_0_result is YYObj_LongIdent(_dollar1)
   let _start_pos_of_item0 = _args[0].1
   let _end_pos_of_item0 = _args[0].2
@@ -25461,21 +26177,21 @@ fn yy_action_813(
 }
 
 // file:///./parser.mbty
-// 2098|    qual_ident_ty_inline optional_type_arguments %prec prec_lower_than_as { 
-// 2099|    Name(
-// 2100|      constr_id = ConstrId::{ id: $1, loc: mk_loc($loc($1)) },
-// 2101|      tys = $2,
-// 2102|      loc = mk_loc($sloc)
-// 2103|    )
-// 2104|  }
+// 2132|    qual_ident_ty_inline optional_type_arguments %prec prec_lower_than_as { 
+// 2133|    Name(
+// 2134|      constr_id = ConstrId::{ id: $1, loc: mk_loc($loc($1)) },
+// 2135|      tys = $2,
+// 2136|      loc = mk_loc($sloc)
+// 2137|    )
+// 2138|  }
 
 ///|
-fn yy_action_815(
+fn yy_action_827(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_816(_last_pos, _args[0:2])
-  let _sub_action_1_result = yy_action_812(_args[1].2, _args[2:5])
+  let _sub_action_0_result = yy_action_828(_last_pos, _args[0:2])
+  let _sub_action_1_result = yy_action_824(_args[1].2, _args[2:5])
   guard _sub_action_0_result is YYObj_LongIdent(_dollar1)
   let _start_pos_of_item0 = _args[0].1
   let _end_pos_of_item0 = _args[0].2
@@ -25502,10 +26218,10 @@ fn yy_action_815(
 }
 
 // file:///./parser.mbty
-// 182|    non_empty_list_commas_rev(X) option(",") { $1.rev() }
+// 187|    non_empty_list_commas_rev(X) option(",") { $1.rev() }
 
 ///|
-fn yy_action_817(
+fn yy_action_829(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -25519,22 +26235,22 @@ fn yy_action_817(
 }
 
 // file:///./parser.mbty
-// 2111|    is_async "(" type_ "," ioption(non_empty_list_commas(type_)) ")" "->" return_type { 
-// 2112|    let (ty_res, ty_err) = $8
-// 2113|    let ts = match $5 { 
-// 2114|      None => @list.empty() 
-// 2115|      Some(ts) => ts 
-// 2116|    }
-// 2117|    Arrow(args = ts.add($3), res = ty_res, err = ty_err, is_async = $1, loc = mk_loc($sloc))
-// 2118|  }
+// 2145|    is_async "(" type_ "," ioption(non_empty_list_commas(type_)) ")" "->" return_type { 
+// 2146|    let (ty_res, ty_err) = $8
+// 2147|    let ts = match $5 { 
+// 2148|      None => @list.empty() 
+// 2149|      Some(ts) => ts 
+// 2150|    }
+// 2151|    Arrow(args = ts.add($3), res = ty_res, err = ty_err, is_async = $1, loc = mk_loc($sloc))
+// 2152|  }
 
 ///|
-fn yy_action_818(
+fn yy_action_830(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
   let _sub_action_0_result = yy_action_8(_last_pos, _args[0:0])
-  let _sub_action_1_result = yy_action_808(_args[2].2, _args[3:4])
+  let _sub_action_1_result = yy_action_820(_args[2].2, _args[3:4])
   guard _args[6].0 is YYObj__Type__ErrorType_(_dollar8)
   guard _sub_action_1_result is YYObj_Option_List_Type__(_dollar5)
   guard _args[1].0 is YYObj_Type(_dollar3)
@@ -25568,7 +26284,7 @@ fn yy_action_818(
 // 10|    X { Some($1) }
 
 ///|
-fn yy_action_808(
+fn yy_action_820(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -25582,10 +26298,10 @@ fn yy_action_808(
 }
 
 // file:///./parser.mbty
-// 2096|    "(" type_ "," non_empty_list_commas(type_) ")" { @syntax.make_tuple_type(loc = mk_loc($sloc), $4.add($2)) }
+// 2130|    "(" type_ "," non_empty_list_commas(type_) ")" { @syntax.make_tuple_type(loc = mk_loc($sloc), $4.add($2)) }
 
 ///|
-fn yy_action_819(
+fn yy_action_831(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -25609,22 +26325,22 @@ fn yy_action_819(
 }
 
 // file:///./parser.mbty
-// 2111|    is_async "(" type_ "," ioption(non_empty_list_commas(type_)) ")" "->" return_type { 
-// 2112|    let (ty_res, ty_err) = $8
-// 2113|    let ts = match $5 { 
-// 2114|      None => @list.empty() 
-// 2115|      Some(ts) => ts 
-// 2116|    }
-// 2117|    Arrow(args = ts.add($3), res = ty_res, err = ty_err, is_async = $1, loc = mk_loc($sloc))
-// 2118|  }
+// 2145|    is_async "(" type_ "," ioption(non_empty_list_commas(type_)) ")" "->" return_type { 
+// 2146|    let (ty_res, ty_err) = $8
+// 2147|    let ts = match $5 { 
+// 2148|      None => @list.empty() 
+// 2149|      Some(ts) => ts 
+// 2150|    }
+// 2151|    Arrow(args = ts.add($3), res = ty_res, err = ty_err, is_async = $1, loc = mk_loc($sloc))
+// 2152|  }
 
 ///|
-fn yy_action_820(
+fn yy_action_832(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
   let _sub_action_0_result = yy_action_8(_last_pos, _args[0:0])
-  let _sub_action_1_result = yy_action_806(_args[2].2, _args[3:3])
+  let _sub_action_1_result = yy_action_818(_args[2].2, _args[3:3])
   guard _args[5].0 is YYObj__Type__ErrorType_(_dollar8)
   guard _sub_action_1_result is YYObj_Option_List_Type__(_dollar5)
   guard _args[1].0 is YYObj_Type(_dollar3)
@@ -25658,7 +26374,7 @@ fn yy_action_820(
 // 9|    { None }
 
 ///|
-fn yy_action_806(
+fn yy_action_818(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -25671,13 +26387,13 @@ fn yy_action_806(
 }
 
 // file:///./parser.mbty
-// 2123|    is_async "(" type_ ")" "->" return_type { 
-// 2124|    let (ty_res, ty_err) = $6
-// 2125|    Arrow(args = @list.singleton($3), res = ty_res, err = ty_err, is_async = $1, loc = mk_loc($sloc))
-// 2126|  }
+// 2157|    is_async "(" type_ ")" "->" return_type { 
+// 2158|    let (ty_res, ty_err) = $6
+// 2159|    Arrow(args = @list.singleton($3), res = ty_res, err = ty_err, is_async = $1, loc = mk_loc($sloc))
+// 2160|  }
 
 ///|
-fn yy_action_821(
+fn yy_action_833(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -25707,10 +26423,10 @@ fn yy_action_821(
 }
 
 // file:///./parser.mbty
-// 2097|    "(" type_ ")" { $2 }
+// 2131|    "(" type_ ")" { $2 }
 
 ///|
-fn yy_action_822(
+fn yy_action_834(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -25724,10 +26440,10 @@ fn yy_action_822(
 }
 
 // file:///./parser.mbty
-// 2066|    type_ { ($1, NoErrorType) }
+// 2100|    type_ { ($1, NoErrorType) }
 
 ///|
-fn yy_action_823(
+fn yy_action_835(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -25741,10 +26457,10 @@ fn yy_action_823(
 }
 
 // file:///./parser.mbty
-// 2053|    "raise" error_type { ErrorType(ty = $2) }
+// 2087|    "raise" error_type { ErrorType(ty = $2) }
 
 ///|
-fn yy_action_824(
+fn yy_action_836(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -25758,17 +26474,17 @@ fn yy_action_824(
 }
 
 // file:///./parser.mbty
-// 2055|    "raise" "?" { 
-// 2056|    let fake_error = Type::Name(
-// 2057|      constr_id = ConstrId::{ id: Ident(name = "Error"), loc: mk_loc($sloc) },
-// 2058|      tys = @list.empty(),
-// 2059|      loc = mk_loc($sloc)
-// 2060|    )
-// 2061|    MaybeError(ty = fake_error)
-// 2062|  }
+// 2089|    "raise" "?" { 
+// 2090|    let fake_error = Type::Name(
+// 2091|      constr_id = ConstrId::{ id: Ident(name = "Error"), loc: mk_loc($sloc) },
+// 2092|      tys = @list.empty(),
+// 2093|      loc = mk_loc($sloc)
+// 2094|    )
+// 2095|    MaybeError(ty = fake_error)
+// 2096|  }
 
 ///|
-fn yy_action_825(
+fn yy_action_837(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -25795,10 +26511,10 @@ fn yy_action_825(
 }
 
 // file:///./parser.mbty
-// 2052|    "raise" { DefaultErrorType(loc = mk_loc($sloc)) }
+// 2086|    "raise" { DefaultErrorType(loc = mk_loc($sloc)) }
 
 ///|
-fn yy_action_826(
+fn yy_action_838(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -25817,10 +26533,10 @@ fn yy_action_826(
 }
 
 // file:///./parser.mbty
-// 2054|    "noraise" { Noraise(loc = mk_loc($sloc)) }
+// 2088|    "noraise" { Noraise(loc = mk_loc($sloc)) }
 
 ///|
-fn yy_action_827(
+fn yy_action_839(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -25839,10 +26555,10 @@ fn yy_action_827(
 }
 
 // file:///./parser.mbty
-// 2068|    simple_type "!" error_type { ($1, ErrorType(ty = $3)) }
+// 2102|    simple_type "!" error_type { ($1, ErrorType(ty = $3)) }
 
 ///|
-fn yy_action_828(
+fn yy_action_840(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -25857,10 +26573,10 @@ fn yy_action_828(
 }
 
 // file:///./parser.mbty
-// 2067|    simple_type "!" { ($1, DefaultErrorType(loc = mk_loc($loc($2)))) }
+// 2101|    simple_type "!" { ($1, DefaultErrorType(loc = mk_loc($loc($2)))) }
 
 ///|
-fn yy_action_829(
+fn yy_action_841(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -25879,10 +26595,10 @@ fn yy_action_829(
 }
 
 // file:///./parser.mbty
-// 2069|    simple_type "?" error_type { ($1, MaybeError(ty = $3)) }
+// 2103|    simple_type "?" error_type { ($1, MaybeError(ty = $3)) }
 
 ///|
-fn yy_action_830(
+fn yy_action_842(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -25897,16 +26613,16 @@ fn yy_action_830(
 }
 
 // file:///./parser.mbty
-// 2084|    qual_ident_ty { 
-// 2085|    Name(
-// 2086|      constr_id = ConstrId::{ id: $1, loc: mk_loc($sloc) },
-// 2087|      tys = @list.empty(),
-// 2088|      loc = mk_loc($sloc)
-// 2089|    )
-// 2090|  }
+// 2118|    qual_ident_ty { 
+// 2119|    Name(
+// 2120|      constr_id = ConstrId::{ id: $1, loc: mk_loc($sloc) },
+// 2121|      tys = @list.empty(),
+// 2122|      loc = mk_loc($sloc)
+// 2123|    )
+// 2124|  }
 
 ///|
-fn yy_action_831(
+fn yy_action_843(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -25933,10 +26649,10 @@ fn yy_action_831(
 }
 
 // file:///./parser.mbty
-// 2091|    "_" { Any(loc = mk_loc($sloc)) }
+// 2125|    "_" { Any(loc = mk_loc($sloc)) }
 
 ///|
-fn yy_action_832(
+fn yy_action_844(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -25955,10 +26671,10 @@ fn yy_action_832(
 }
 
 // file:///./parser.mbty
-// 2095|    simple_type "?" { @syntax.make_option_type(loc = mk_loc($sloc), constr_loc = mk_loc($loc($2)), $1) }
+// 2129|    simple_type "?" { @syntax.make_option_type(loc = mk_loc($sloc), constr_loc = mk_loc($loc($2)), $1) }
 
 ///|
-fn yy_action_833(
+fn yy_action_845(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -25984,10 +26700,10 @@ fn yy_action_833(
 }
 
 // file:///./parser.mbty
-// 2070|    simple_type error_annotation { ($1, $2) }
+// 2104|    simple_type error_annotation { ($1, $2) }
 
 ///|
-fn yy_action_834(
+fn yy_action_846(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -26002,10 +26718,10 @@ fn yy_action_834(
 }
 
 // file:///./parser.mbty
-// 2110|    simple_type { $1 }
+// 2144|    simple_type { $1 }
 
 ///|
-fn yy_action_835(
+fn yy_action_847(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -26019,13 +26735,13 @@ fn yy_action_835(
 }
 
 // file:///./parser.mbty
-// 2119|    is_async "(" ")" "->" return_type { 
-// 2120|    let (ty_res, ty_err) = $5
-// 2121|    Arrow(args = @list.empty(), res = ty_res, err = ty_err, is_async = $1, loc = mk_loc($sloc))
-// 2122|  }
+// 2153|    is_async "(" ")" "->" return_type { 
+// 2154|    let (ty_res, ty_err) = $5
+// 2155|    Arrow(args = @list.empty(), res = ty_res, err = ty_err, is_async = $1, loc = mk_loc($sloc))
+// 2156|  }
 
 ///|
-fn yy_action_836(
+fn yy_action_848(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -26054,7 +26770,7 @@ fn yy_action_836(
 }
 
 // file:///./parser.mbty
-// 281|    { None }
+// 286|    { None }
 
 ///|
 fn yy_action_8(
@@ -26070,21 +26786,21 @@ fn yy_action_8(
 }
 
 // file:///./parser.mbty
-// 2098|    qual_ident_ty_inline optional_type_arguments %prec prec_lower_than_as { 
-// 2099|    Name(
-// 2100|      constr_id = ConstrId::{ id: $1, loc: mk_loc($loc($1)) },
-// 2101|      tys = $2,
-// 2102|      loc = mk_loc($sloc)
-// 2103|    )
-// 2104|  }
+// 2132|    qual_ident_ty_inline optional_type_arguments %prec prec_lower_than_as { 
+// 2133|    Name(
+// 2134|      constr_id = ConstrId::{ id: $1, loc: mk_loc($loc($1)) },
+// 2135|      tys = $2,
+// 2136|      loc = mk_loc($sloc)
+// 2137|    )
+// 2138|  }
 
 ///|
-fn yy_action_837(
+fn yy_action_849(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_838(_last_pos, _args[0:1])
-  let _sub_action_1_result = yy_action_812(_args[0].2, _args[1:4])
+  let _sub_action_0_result = yy_action_850(_last_pos, _args[0:1])
+  let _sub_action_1_result = yy_action_824(_args[0].2, _args[1:4])
   guard _sub_action_0_result is YYObj_LongIdent(_dollar1)
   let _start_pos_of_item0 = _args[0].1
   let _end_pos_of_item0 = _args[0].2
@@ -26111,19 +26827,19 @@ fn yy_action_837(
 }
 
 // file:///./parser.mbty
-// 303|    ioption(delimited("[", non_empty_list_commas(type_), "]")) {
-// 304|    match $1 {
-// 305|      None => @list.empty()
-// 306|      Some(params) => params
-// 307|    }
-// 308|  }
+// 308|    ioption(delimited("[", non_empty_list_commas(type_), "]")) {
+// 309|    match $1 {
+// 310|      None => @list.empty()
+// 311|      Some(params) => params
+// 312|    }
+// 313|  }
 
 ///|
-fn yy_action_812(
+fn yy_action_824(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_839(_last_pos, _args[0:3])
+  let _sub_action_0_result = yy_action_851(_last_pos, _args[0:3])
   guard _sub_action_0_result is YYObj_Option_List_Type__(_dollar1)
   YYObj_List_Type_(
     {
@@ -26140,11 +26856,11 @@ fn yy_action_812(
 // 10|    X { Some($1) }
 
 ///|
-fn yy_action_839(
+fn yy_action_851(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_840(_last_pos, _args[0:3])
+  let _sub_action_0_result = yy_action_852(_last_pos, _args[0:3])
   guard _sub_action_0_result is YYObj_List_Type_(_dollar1)
   YYObj_Option_List_Type__(
     {
@@ -26158,7 +26874,7 @@ fn yy_action_839(
 // 40|    L X R { $2 }
 
 ///|
-fn yy_action_840(
+fn yy_action_852(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -26172,21 +26888,21 @@ fn yy_action_840(
 }
 
 // file:///./parser.mbty
-// 2098|    qual_ident_ty_inline optional_type_arguments %prec prec_lower_than_as { 
-// 2099|    Name(
-// 2100|      constr_id = ConstrId::{ id: $1, loc: mk_loc($loc($1)) },
-// 2101|      tys = $2,
-// 2102|      loc = mk_loc($sloc)
-// 2103|    )
-// 2104|  }
+// 2132|    qual_ident_ty_inline optional_type_arguments %prec prec_lower_than_as { 
+// 2133|    Name(
+// 2134|      constr_id = ConstrId::{ id: $1, loc: mk_loc($loc($1)) },
+// 2135|      tys = $2,
+// 2136|      loc = mk_loc($sloc)
+// 2137|    )
+// 2138|  }
 
 ///|
-fn yy_action_841(
+fn yy_action_853(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_838(_last_pos, _args[0:1])
-  let _sub_action_1_result = yy_action_814(_args[0].2, _args[1:1])
+  let _sub_action_0_result = yy_action_850(_last_pos, _args[0:1])
+  let _sub_action_1_result = yy_action_826(_args[0].2, _args[1:1])
   guard _sub_action_0_result is YYObj_LongIdent(_dollar1)
   let _start_pos_of_item0 = _args[0].1
   let _end_pos_of_item0 = _args[0].2
@@ -26213,10 +26929,10 @@ fn yy_action_841(
 }
 
 // file:///./parser.mbty
-// 174|    non_empty_list_commas_rev(X) "," X { $1.add($3) }
+// 179|    non_empty_list_commas_rev(X) "," X { $1.add($3) }
 
 ///|
-fn yy_action_842(
+fn yy_action_854(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -26231,10 +26947,10 @@ fn yy_action_842(
 }
 
 // file:///./parser.mbty
-// 173|    X { @list.singleton($1) }
+// 178|    X { @list.singleton($1) }
 
 ///|
-fn yy_action_843(
+fn yy_action_855(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -26248,21 +26964,21 @@ fn yy_action_843(
 }
 
 // file:///./parser.mbty
-// 2098|    qual_ident_ty_inline optional_type_arguments %prec prec_lower_than_as { 
-// 2099|    Name(
-// 2100|      constr_id = ConstrId::{ id: $1, loc: mk_loc($loc($1)) },
-// 2101|      tys = $2,
-// 2102|      loc = mk_loc($sloc)
-// 2103|    )
-// 2104|  }
+// 2132|    qual_ident_ty_inline optional_type_arguments %prec prec_lower_than_as { 
+// 2133|    Name(
+// 2134|      constr_id = ConstrId::{ id: $1, loc: mk_loc($loc($1)) },
+// 2135|      tys = $2,
+// 2136|      loc = mk_loc($sloc)
+// 2137|    )
+// 2138|  }
 
 ///|
-fn yy_action_844(
+fn yy_action_856(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_816(_last_pos, _args[0:2])
-  let _sub_action_1_result = yy_action_814(_args[1].2, _args[2:2])
+  let _sub_action_0_result = yy_action_828(_last_pos, _args[0:2])
+  let _sub_action_1_result = yy_action_826(_args[1].2, _args[2:2])
   guard _sub_action_0_result is YYObj_LongIdent(_dollar1)
   let _start_pos_of_item0 = _args[0].1
   let _end_pos_of_item0 = _args[0].2
@@ -26289,19 +27005,19 @@ fn yy_action_844(
 }
 
 // file:///./parser.mbty
-// 303|    ioption(delimited("[", non_empty_list_commas(type_), "]")) {
-// 304|    match $1 {
-// 305|      None => @list.empty()
-// 306|      Some(params) => params
-// 307|    }
-// 308|  }
+// 308|    ioption(delimited("[", non_empty_list_commas(type_), "]")) {
+// 309|    match $1 {
+// 310|      None => @list.empty()
+// 311|      Some(params) => params
+// 312|    }
+// 313|  }
 
 ///|
-fn yy_action_814(
+fn yy_action_826(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_845(_last_pos, _args[0:0])
+  let _sub_action_0_result = yy_action_857(_last_pos, _args[0:0])
   guard _sub_action_0_result is YYObj_Option_List_Type__(_dollar1)
   YYObj_List_Type_(
     {
@@ -26318,7 +27034,7 @@ fn yy_action_814(
 // 9|    { None }
 
 ///|
-fn yy_action_845(
+fn yy_action_857(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -26331,10 +27047,10 @@ fn yy_action_845(
 }
 
 // file:///./parser.mbty
-// 2105|    "&" qual_ident_ty { Object(ConstrId::{ id: $2, loc: mk_loc($loc($2)) }) }
+// 2139|    "&" qual_ident_ty { Object(ConstrId::{ id: $2, loc: mk_loc($loc($2)) }) }
 
 ///|
-fn yy_action_846(
+fn yy_action_858(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -26353,10 +27069,10 @@ fn yy_action_846(
 }
 
 // file:///./parser.mbty
-// 2106|    "_" { Any(loc = mk_loc($sloc)) }
+// 2140|    "_" { Any(loc = mk_loc($sloc)) }
 
 ///|
-fn yy_action_847(
+fn yy_action_859(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -26375,13 +27091,13 @@ fn yy_action_847(
 }
 
 // file:///./parser.mbty
-// 2119|    is_async "(" ")" "->" return_type { 
-// 2120|    let (ty_res, ty_err) = $5
-// 2121|    Arrow(args = @list.empty(), res = ty_res, err = ty_err, is_async = $1, loc = mk_loc($sloc))
-// 2122|  }
+// 2153|    is_async "(" ")" "->" return_type { 
+// 2154|    let (ty_res, ty_err) = $5
+// 2155|    Arrow(args = @list.empty(), res = ty_res, err = ty_err, is_async = $1, loc = mk_loc($sloc))
+// 2156|  }
 
 ///|
-fn yy_action_848(
+fn yy_action_860(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -26410,7 +27126,7 @@ fn yy_action_848(
 }
 
 // file:///./parser.mbty
-// 280|    "async" { Some(mk_loc($loc($1))) }
+// 285|    "async" { Some(mk_loc($loc($1))) }
 
 ///|
 fn yy_action_5(
@@ -26428,10 +27144,10 @@ fn yy_action_5(
 }
 
 // file:///./parser.mbty
-// 2079|    error_annotation { (None, $1) }
+// 2113|    error_annotation { (None, $1) }
 
 ///|
-fn yy_action_849(
+fn yy_action_861(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -26445,10 +27161,10 @@ fn yy_action_849(
 }
 
 // file:///./parser.mbty
-// 2080|     { (None, NoErrorType) }
+// 2114|     { (None, NoErrorType) }
 
 ///|
-fn yy_action_850(
+fn yy_action_862(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -26461,10 +27177,10 @@ fn yy_action_850(
 }
 
 // file:///./parser.mbty
-// 1103|     { None }
+// 1112|     { None }
 
 ///|
-fn yy_action_851(
+fn yy_action_863(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -26477,17 +27193,17 @@ fn yy_action_851(
 }
 
 // file:///./parser.mbty
-// 1948|    map_syntax_key ":" expr { 
-// 1949|    MapExprElem::{
-// 1950|      key: $1,
-// 1951|      expr: $3,
-// 1952|      key_loc: mk_loc($loc($1)),
-// 1953|      loc: mk_loc($sloc)
-// 1954|    }
-// 1955|  }
+// 1982|    map_syntax_key ":" expr { 
+// 1983|    MapExprElem::{
+// 1984|      key: $1,
+// 1985|      expr: $3,
+// 1986|      key_loc: mk_loc($loc($1)),
+// 1987|      loc: mk_loc($sloc)
+// 1988|    }
+// 1989|  }
 
 ///|
-fn yy_action_852(
+fn yy_action_864(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -26515,10 +27231,10 @@ fn yy_action_852(
 }
 
 // file:///./parser.mbty
-// 174|    non_empty_list_commas_rev(X) "," X { $1.add($3) }
+// 179|    non_empty_list_commas_rev(X) "," X { $1.add($3) }
 
 ///|
-fn yy_action_853(
+fn yy_action_865(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -26533,10 +27249,10 @@ fn yy_action_853(
 }
 
 // file:///./parser.mbty
-// 182|    non_empty_list_commas_rev(X) option(",") { $1.rev() }
+// 187|    non_empty_list_commas_rev(X) option(",") { $1.rev() }
 
 ///|
-fn yy_action_854(
+fn yy_action_866(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -26550,10 +27266,10 @@ fn yy_action_854(
 }
 
 // file:///./parser.mbty
-// 173|    X { @list.singleton($1) }
+// 178|    X { @list.singleton($1) }
 
 ///|
-fn yy_action_855(
+fn yy_action_867(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -26567,10 +27283,10 @@ fn yy_action_855(
 }
 
 // file:///./parser.mbty
-// 190|    { @list.empty() }
+// 195|    { @list.empty() }
 
 ///|
-fn yy_action_856(
+fn yy_action_868(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -26583,10 +27299,10 @@ fn yy_action_856(
 }
 
 // file:///./parser.mbty
-// 1748|    anony_fn { Function(func = $1, loc = mk_loc($sloc)) }
+// 1782|    anony_fn { Function(func = $1, loc = mk_loc($sloc)) }
 
 ///|
-fn yy_action_857(
+fn yy_action_869(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -26606,10 +27322,10 @@ fn yy_action_857(
 }
 
 // file:///./parser.mbty
-// 1749|    atomic_expr { $1 }
+// 1783|    atomic_expr { $1 }
 
 ///|
-fn yy_action_858(
+fn yy_action_870(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -26623,10 +27339,10 @@ fn yy_action_858(
 }
 
 // file:///./parser.mbty
-// 1751|    qual_ident_simple_expr { @syntax.make_ident_expr(loc = mk_loc($sloc), Var::{ name: $1, loc: mk_loc($sloc) }) }
+// 1785|    qual_ident_simple_expr { @syntax.make_ident_expr(loc = mk_loc($sloc), Var::{ name: $1, loc: mk_loc($sloc) }) }
 
 ///|
-fn yy_action_859(
+fn yy_action_871(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -26649,10 +27365,10 @@ fn yy_action_859(
 }
 
 // file:///./parser.mbty
-// 1752|    constr { Constr(constr = $1, loc = mk_loc($sloc)) }
+// 1786|    constr { Constr(constr = $1, loc = mk_loc($sloc)) }
 
 ///|
-fn yy_action_860(
+fn yy_action_872(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -26672,10 +27388,10 @@ fn yy_action_860(
 }
 
 // file:///./parser.mbty
-// 1944|    ".." expr { Spread(expr = $2, loc = mk_loc($sloc)) }
+// 1978|    ".." expr { Spread(expr = $2, loc = mk_loc($sloc)) }
 
 ///|
-fn yy_action_861(
+fn yy_action_873(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -26695,10 +27411,10 @@ fn yy_action_861(
 }
 
 // file:///./parser.mbty
-// 174|    non_empty_list_commas_rev(X) "," X { $1.add($3) }
+// 179|    non_empty_list_commas_rev(X) "," X { $1.add($3) }
 
 ///|
-fn yy_action_862(
+fn yy_action_874(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -26716,7 +27432,7 @@ fn yy_action_862(
 // 5|    X { Some($1) }
 
 ///|
-fn yy_action_863(
+fn yy_action_875(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -26730,10 +27446,10 @@ fn yy_action_863(
 }
 
 // file:///./parser.mbty
-// 182|    non_empty_list_commas_rev(X) option(",") { $1.rev() }
+// 187|    non_empty_list_commas_rev(X) option(",") { $1.rev() }
 
 ///|
-fn yy_action_864(
+fn yy_action_876(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -26750,7 +27466,7 @@ fn yy_action_864(
 // 4|    { None }
 
 ///|
-fn yy_action_865(
+fn yy_action_877(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -26763,10 +27479,10 @@ fn yy_action_865(
 }
 
 // file:///./parser.mbty
-// 173|    X { @list.singleton($1) }
+// 178|    X { @list.singleton($1) }
 
 ///|
-fn yy_action_866(
+fn yy_action_878(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -26780,10 +27496,10 @@ fn yy_action_866(
 }
 
 // file:///./parser.mbty
-// 190|    { @list.empty() }
+// 195|    { @list.empty() }
 
 ///|
-fn yy_action_867(
+fn yy_action_879(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -26796,10 +27512,10 @@ fn yy_action_867(
 }
 
 // file:///./parser.mbty
-// 1805|    tuple_expr { $1 }
+// 1839|    tuple_expr { $1 }
 
 ///|
-fn yy_action_868(
+fn yy_action_880(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -26813,10 +27529,10 @@ fn yy_action_868(
 }
 
 // file:///./parser.mbty
-// 1850|    qual_ident_ty { TypeName::{ name: $1, is_object: false, loc: mk_loc($sloc) } }
+// 1884|    qual_ident_ty { TypeName::{ name: $1, is_object: false, loc: mk_loc($sloc) } }
 
 ///|
-fn yy_action_869(
+fn yy_action_881(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -26840,14 +27556,14 @@ fn yy_action_869(
 }
 
 // file:///./parser.mbty
-// 1091|    qual_ident_ty_inline { $1 }
+// 1100|    qual_ident_ty_inline { $1 }
 
 ///|
-fn yy_action_870(
+fn yy_action_882(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_838(_last_pos, _args[0:1])
+  let _sub_action_0_result = yy_action_850(_last_pos, _args[0:1])
   guard _sub_action_0_result is YYObj_LongIdent(_dollar1)
   YYObj_LongIdent(
     {
@@ -26858,10 +27574,10 @@ fn yy_action_870(
 }
 
 // file:///./parser.mbty
-// 1085|    UIDENT { LongIdent::Ident(name = $1) }
+// 1094|    UIDENT { LongIdent::Ident(name = $1) }
 
 ///|
-fn yy_action_838(
+fn yy_action_850(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -26875,14 +27591,14 @@ fn yy_action_838(
 }
 
 // file:///./parser.mbty
-// 1091|    qual_ident_ty_inline { $1 }
+// 1100|    qual_ident_ty_inline { $1 }
 
 ///|
-fn yy_action_871(
+fn yy_action_883(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_811(_last_pos, _args[0:2])
+  let _sub_action_0_result = yy_action_823(_last_pos, _args[0:2])
   guard _sub_action_0_result is YYObj_LongIdent(_dollar1)
   YYObj_LongIdent(
     {
@@ -26893,10 +27609,10 @@ fn yy_action_871(
 }
 
 // file:///./parser.mbty
-// 1086|    PACKAGE_NAME DOT_LIDENT { LongIdent::Dot(pkg = $1, id = $2) }
+// 1095|    PACKAGE_NAME DOT_LIDENT { LongIdent::Dot(pkg = $1, id = $2) }
 
 ///|
-fn yy_action_811(
+fn yy_action_823(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -26911,14 +27627,14 @@ fn yy_action_811(
 }
 
 // file:///./parser.mbty
-// 1091|    qual_ident_ty_inline { $1 }
+// 1100|    qual_ident_ty_inline { $1 }
 
 ///|
-fn yy_action_872(
+fn yy_action_884(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
-  let _sub_action_0_result = yy_action_816(_last_pos, _args[0:2])
+  let _sub_action_0_result = yy_action_828(_last_pos, _args[0:2])
   guard _sub_action_0_result is YYObj_LongIdent(_dollar1)
   YYObj_LongIdent(
     {
@@ -26929,10 +27645,10 @@ fn yy_action_872(
 }
 
 // file:///./parser.mbty
-// 1087|    PACKAGE_NAME DOT_UIDENT { LongIdent::Dot(pkg = $1, id = $2) }
+// 1096|    PACKAGE_NAME DOT_UIDENT { LongIdent::Dot(pkg = $1, id = $2) }
 
 ///|
-fn yy_action_816(
+fn yy_action_828(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -26947,10 +27663,10 @@ fn yy_action_816(
 }
 
 // file:///./parser.mbty
-// 1851|    "&" qual_ident_ty { TypeName::{ name: $2, is_object: true, loc: mk_loc($sloc) } }
+// 1885|    "&" qual_ident_ty { TypeName::{ name: $2, is_object: true, loc: mk_loc($sloc) } }
 
 ///|
-fn yy_action_873(
+fn yy_action_885(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -26974,10 +27690,10 @@ fn yy_action_873(
 }
 
 // file:///./parser.mbty
-// 1862|    simple_constant { make_constant_expr(loc = mk_loc($sloc), $1) }
+// 1896|    simple_constant { make_constant_expr(loc = mk_loc($sloc), $1) }
 
 ///|
-fn yy_action_874(
+fn yy_action_886(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -26997,12 +27713,12 @@ fn yy_action_874(
 }
 
 // file:///./parser.mbty
-// 1863|    non_empty_list(multiline_string) { 
-// 1864|    MultilineString(elems = $1, loc = mk_loc($sloc))
-// 1865|  }
+// 1897|    non_empty_list(multiline_string) { 
+// 1898|    MultilineString(elems = $1, loc = mk_loc($sloc))
+// 1899|  }
 
 ///|
-fn yy_action_875(
+fn yy_action_887(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -27022,10 +27738,10 @@ fn yy_action_875(
 }
 
 // file:///./parser.mbty
-// 1866|    INTERP { make_interp_expr(loc = mk_loc($sloc), $1) }
+// 1900|    INTERP { make_interp_expr(loc = mk_loc($sloc), $1) }
 
 ///|
-fn yy_action_876(
+fn yy_action_888(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -27045,10 +27761,10 @@ fn yy_action_876(
 }
 
 // file:///./parser.mbty
-// 1870|    TRUE { Bool(true) }
+// 1904|    TRUE { Bool(true) }
 
 ///|
-fn yy_action_877(
+fn yy_action_889(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -27061,10 +27777,10 @@ fn yy_action_877(
 }
 
 // file:///./parser.mbty
-// 1871|    FALSE { Bool(false) }
+// 1905|    FALSE { Bool(false) }
 
 ///|
-fn yy_action_878(
+fn yy_action_890(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -27077,10 +27793,10 @@ fn yy_action_878(
 }
 
 // file:///./parser.mbty
-// 1872|    BYTE { Byte($1) }
+// 1906|    BYTE { Byte($1) }
 
 ///|
-fn yy_action_879(
+fn yy_action_891(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -27094,10 +27810,10 @@ fn yy_action_879(
 }
 
 // file:///./parser.mbty
-// 1873|    BYTES { Bytes($1) }
+// 1907|    BYTES { Bytes($1) }
 
 ///|
-fn yy_action_880(
+fn yy_action_892(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -27111,10 +27827,10 @@ fn yy_action_880(
 }
 
 // file:///./parser.mbty
-// 1874|    CHAR { Char($1) }
+// 1908|    CHAR { Char($1) }
 
 ///|
-fn yy_action_881(
+fn yy_action_893(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -27128,10 +27844,10 @@ fn yy_action_881(
 }
 
 // file:///./parser.mbty
-// 1875|    INT { make_int($1) }
+// 1909|    INT { make_int($1) }
 
 ///|
-fn yy_action_882(
+fn yy_action_894(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -27145,10 +27861,10 @@ fn yy_action_882(
 }
 
 // file:///./parser.mbty
-// 1876|    DOUBLE { make_double($1) }
+// 1910|    DOUBLE { make_double($1) }
 
 ///|
-fn yy_action_883(
+fn yy_action_895(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -27162,10 +27878,10 @@ fn yy_action_883(
 }
 
 // file:///./parser.mbty
-// 1877|    FLOAT { make_float($1) }
+// 1911|    FLOAT { make_float($1) }
 
 ///|
-fn yy_action_884(
+fn yy_action_896(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -27179,10 +27895,10 @@ fn yy_action_884(
 }
 
 // file:///./parser.mbty
-// 1878|    STRING { String($1) }
+// 1912|    STRING { String($1) }
 
 ///|
-fn yy_action_885(
+fn yy_action_897(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -27196,10 +27912,10 @@ fn yy_action_885(
 }
 
 // file:///./parser.mbty
-// 1855|    MULTILINE_STRING { String($1) }
+// 1889|    MULTILINE_STRING { String($1) }
 
 ///|
-fn yy_action_886(
+fn yy_action_898(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -27213,12 +27929,12 @@ fn yy_action_886(
 }
 
 // file:///./parser.mbty
-// 1856|    MULTILINE_INTERP { 
-// 1857|    Interp(make_interps($1))
-// 1858|  }
+// 1890|    MULTILINE_INTERP { 
+// 1891|    Interp(make_interps($1))
+// 1892|  }
 
 ///|
-fn yy_action_887(
+fn yy_action_899(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -27232,10 +27948,10 @@ fn yy_action_887(
 }
 
 // file:///./parser.mbty
-// 169|    X non_empty_list(X) { $2.add($1) }
+// 174|    X non_empty_list(X) { $2.add($1) }
 
 ///|
-fn yy_action_888(
+fn yy_action_900(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -27250,10 +27966,10 @@ fn yy_action_888(
 }
 
 // file:///./parser.mbty
-// 168|    X { @list.singleton($1) }
+// 173|    X { @list.singleton($1) }
 
 ///|
-fn yy_action_889(
+fn yy_action_901(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -27267,10 +27983,10 @@ fn yy_action_889(
 }
 
 // file:///./parser.mbty
-// 1202|     { None}
+// 1211|     { None}
 
 ///|
-fn yy_action_890(
+fn yy_action_902(
   _last_pos : Position,
   _args : ArrayView[(YYObj, Position, Position)],
 ) -> YYObj {
@@ -27397,11 +28113,13 @@ fn yy_input(
     ENUMVIEW => (T_ENUMVIEW, YYObj_Void)
     DECLARE => (T_DECLARE, YYObj_Void)
     NORAISE => (T_NORAISE, YYObj_Void)
+    NOBREAK => (T_NOBREAK, YYObj_Void)
     WHERE => (T_WHERE, YYObj_Void)
     TRY_QUESTION => (T_TRY_QUESTION, YYObj_Void)
     TRY_EXCLAMATION => (T_TRY_EXCLAMATION, YYObj_Void)
     LEXMATCH => (T_LEXMATCH, YYObj_Void)
     LEXMATCH_QUESTION => (T_LEXMATCH_QUESTION, YYObj_Void)
+    PACKAGE => (T_PACKAGE, YYObj_Void)
   }
 }
 
@@ -27461,17 +28179,17 @@ fn yy_state_0(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    T_POST_LABEL => Shift(yy_state_528)
-    T_LIDENT => Shift(yy_state_530)
-    NT_expr => Shift(yy_state_837)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_POST_LABEL => Shift(yy_state_530)
+    T_LIDENT => Shift(yy_state_532)
+    NT_expr => Shift(yy_state_845)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
     _ => Error
   }
 }
@@ -27528,84 +28246,84 @@ fn yy_state_2(_lookahead : YYSymbol) -> YYDecision {
     | T_IS
     | T_AND
     | T_LEXMATCH_QUESTION =>
-      Reduce(1, NT_non_empty_list_multiline_string_, yy_action_889)
+      Reduce(1, NT_non_empty_list_multiline_string_, yy_action_901)
     _ => Error
   }
 }
 
 ///|
 fn yy_state_3(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_non_empty_list_multiline_string_, yy_action_888)
+  ReduceNoLookahead(2, NT_non_empty_list_multiline_string_, yy_action_900)
 }
 
 ///|
 fn yy_state_4(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_multiline_string, yy_action_887)
+  ReduceNoLookahead(1, NT_multiline_string, yy_action_899)
 }
 
 ///|
 fn yy_state_5(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_multiline_string, yy_action_886)
+  ReduceNoLookahead(1, NT_multiline_string, yy_action_898)
 }
 
 ///|
 fn yy_state_6(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_simple_constant, yy_action_885)
+  ReduceNoLookahead(1, NT_simple_constant, yy_action_897)
 }
 
 ///|
 fn yy_state_7(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_simple_constant, yy_action_884)
+  ReduceNoLookahead(1, NT_simple_constant, yy_action_896)
 }
 
 ///|
 fn yy_state_8(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_simple_constant, yy_action_883)
+  ReduceNoLookahead(1, NT_simple_constant, yy_action_895)
 }
 
 ///|
 fn yy_state_9(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_simple_constant, yy_action_882)
+  ReduceNoLookahead(1, NT_simple_constant, yy_action_894)
 }
 
 ///|
 fn yy_state_10(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_simple_constant, yy_action_881)
+  ReduceNoLookahead(1, NT_simple_constant, yy_action_893)
 }
 
 ///|
 fn yy_state_11(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_simple_constant, yy_action_880)
+  ReduceNoLookahead(1, NT_simple_constant, yy_action_892)
 }
 
 ///|
 fn yy_state_12(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_simple_constant, yy_action_879)
+  ReduceNoLookahead(1, NT_simple_constant, yy_action_891)
 }
 
 ///|
 fn yy_state_13(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_simple_constant, yy_action_878)
+  ReduceNoLookahead(1, NT_simple_constant, yy_action_890)
 }
 
 ///|
 fn yy_state_14(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_simple_constant, yy_action_877)
+  ReduceNoLookahead(1, NT_simple_constant, yy_action_889)
 }
 
 ///|
 fn yy_state_15(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_atomic_expr, yy_action_876)
+  ReduceNoLookahead(1, NT_atomic_expr, yy_action_888)
 }
 
 ///|
 fn yy_state_16(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_atomic_expr, yy_action_875)
+  ReduceNoLookahead(1, NT_atomic_expr, yy_action_887)
 }
 
 ///|
 fn yy_state_17(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_atomic_expr, yy_action_874)
+  ReduceNoLookahead(1, NT_atomic_expr, yy_action_886)
 }
 
 ///|
@@ -27620,7 +28338,7 @@ fn yy_state_18(_lookahead : YYSymbol) -> YYDecision {
 
 ///|
 fn yy_state_19(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_type_name, yy_action_873)
+  ReduceNoLookahead(2, NT_type_name, yy_action_885)
 }
 
 ///|
@@ -27634,27 +28352,27 @@ fn yy_state_20(_lookahead : YYSymbol) -> YYDecision {
 
 ///|
 fn yy_state_21(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_qual_ident_ty, yy_action_872)
+  ReduceNoLookahead(2, NT_qual_ident_ty, yy_action_884)
 }
 
 ///|
 fn yy_state_22(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_qual_ident_ty, yy_action_871)
+  ReduceNoLookahead(2, NT_qual_ident_ty, yy_action_883)
 }
 
 ///|
 fn yy_state_23(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_qual_ident_ty, yy_action_870)
+  ReduceNoLookahead(1, NT_qual_ident_ty, yy_action_882)
 }
 
 ///|
 fn yy_state_24(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_type_name, yy_action_869)
+  ReduceNoLookahead(1, NT_type_name, yy_action_881)
 }
 
 ///|
 fn yy_state_25(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_simple_expr, yy_action_868)
+  ReduceNoLookahead(1, NT_simple_expr, yy_action_880)
 }
 
 ///|
@@ -27715,20 +28433,20 @@ fn yy_state_26(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    T_POST_LABEL => Shift(yy_state_528)
-    T_LIDENT => Shift(yy_state_530)
-    NT_expr => Shift(yy_state_833)
-    NT_non_empty_list_commas_spreadable_elem_ => Shift(yy_state_834)
-    NT_list_commas_spreadable_elem_ => Shift(yy_state_835)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
-    T_RBRACKET => Reduce(0, NT_list_commas_spreadable_elem_, yy_action_867)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_POST_LABEL => Shift(yy_state_530)
+    T_LIDENT => Shift(yy_state_532)
+    NT_expr => Shift(yy_state_841)
+    NT_non_empty_list_commas_spreadable_elem_ => Shift(yy_state_842)
+    NT_list_commas_spreadable_elem_ => Shift(yy_state_843)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
+    T_RBRACKET => Reduce(0, NT_list_commas_spreadable_elem_, yy_action_879)
     _ => Error
   }
 }
@@ -27738,7 +28456,7 @@ fn yy_state_27(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(
     1,
     NT_non_empty_list_commas_rev_spreadable_elem_,
-    yy_action_866,
+    yy_action_878,
   )
 }
 
@@ -27747,14 +28465,14 @@ fn yy_state_28(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_option_COMMA_ => Shift(yy_state_29)
     T_COMMA => Shift(yy_state_30)
-    T_RBRACKET => Reduce(0, NT_option_COMMA_, yy_action_865)
+    T_RBRACKET => Reduce(0, NT_option_COMMA_, yy_action_877)
     _ => Error
   }
 }
 
 ///|
 fn yy_state_29(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_non_empty_list_commas_spreadable_elem_, yy_action_864)
+  ReduceNoLookahead(2, NT_non_empty_list_commas_spreadable_elem_, yy_action_876)
 }
 
 ///|
@@ -27814,18 +28532,18 @@ fn yy_state_30(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    T_POST_LABEL => Shift(yy_state_528)
-    T_LIDENT => Shift(yy_state_530)
-    NT_expr => Shift(yy_state_833)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
-    T_RBRACKET => Reduce(1, NT_option_COMMA_, yy_action_863)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_POST_LABEL => Shift(yy_state_530)
+    T_LIDENT => Shift(yy_state_532)
+    NT_expr => Shift(yy_state_841)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
+    T_RBRACKET => Reduce(1, NT_option_COMMA_, yy_action_875)
     _ => Error
   }
 }
@@ -27835,7 +28553,7 @@ fn yy_state_31(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(
     3,
     NT_non_empty_list_commas_rev_spreadable_elem_,
-    yy_action_862,
+    yy_action_874,
   )
 }
 
@@ -27895,43 +28613,43 @@ fn yy_state_32(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    T_POST_LABEL => Shift(yy_state_528)
-    T_LIDENT => Shift(yy_state_530)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_POST_LABEL => Shift(yy_state_530)
+    T_LIDENT => Shift(yy_state_532)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
     _ => Error
   }
 }
 
 ///|
 fn yy_state_33(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_spreadable_elem, yy_action_861)
+  ReduceNoLookahead(2, NT_spreadable_elem, yy_action_873)
 }
 
 ///|
 fn yy_state_34(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_simple_expr, yy_action_860)
+  ReduceNoLookahead(1, NT_simple_expr, yy_action_872)
 }
 
 ///|
 fn yy_state_35(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_simple_expr, yy_action_859)
+  ReduceNoLookahead(1, NT_simple_expr, yy_action_871)
 }
 
 ///|
 fn yy_state_36(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_simple_expr, yy_action_858)
+  ReduceNoLookahead(1, NT_simple_expr, yy_action_870)
 }
 
 ///|
 fn yy_state_37(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_simple_expr, yy_action_857)
+  ReduceNoLookahead(1, NT_simple_expr, yy_action_869)
 }
 
 ///|
@@ -27989,43 +28707,43 @@ fn yy_state_38(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    T_POST_LABEL => Shift(yy_state_528)
-    NT_expr => Shift(yy_state_533)
-    NT_left_value => Shift(yy_state_534)
-    T_ELLIPSIS => Shift(yy_state_539)
-    T_RAISE => Shift(yy_state_540)
-    T_PACKAGE_NAME => Shift(yy_state_542)
-    NT_expr_statement_no_break_continue_return => Shift(yy_state_599)
-    T_RETURN => Shift(yy_state_600)
-    T_CONTINUE => Shift(yy_state_603)
-    T_BREAK => Shift(yy_state_612)
-    T_GUARD => Shift(yy_state_739)
-    NT_expr_statement => Shift(yy_state_743)
-    T_DEFER => Shift(yy_state_744)
-    NT_guard_statement => Shift(yy_state_746)
-    T_FN => Shift(yy_state_747)
-    T_ASYNC => Shift(yy_state_753)
-    T_LETREC => Shift(yy_state_760)
-    T_LET => Shift(yy_state_786)
-    NT_non_empty_list_commas_map_expr_elem_ => Shift(yy_state_805)
-    NT_non_empty_list_semi_rev_aux_statement_ => Shift(yy_state_806)
-    NT_simple_constant => Shift(yy_state_808)
-    NT_list_commas_map_expr_elem_ => Shift(yy_state_809)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_POST_LABEL => Shift(yy_state_530)
+    NT_expr => Shift(yy_state_535)
+    NT_left_value => Shift(yy_state_536)
+    T_ELLIPSIS => Shift(yy_state_541)
+    T_RAISE => Shift(yy_state_542)
+    T_PACKAGE_NAME => Shift(yy_state_544)
+    NT_expr_statement_no_break_continue_return => Shift(yy_state_601)
+    T_RETURN => Shift(yy_state_602)
+    T_CONTINUE => Shift(yy_state_605)
+    T_BREAK => Shift(yy_state_614)
+    T_GUARD => Shift(yy_state_747)
+    NT_expr_statement => Shift(yy_state_751)
+    T_DEFER => Shift(yy_state_752)
+    NT_guard_statement => Shift(yy_state_754)
+    T_FN => Shift(yy_state_755)
+    T_ASYNC => Shift(yy_state_761)
+    T_LETREC => Shift(yy_state_768)
+    T_LET => Shift(yy_state_794)
+    NT_non_empty_list_commas_map_expr_elem_ => Shift(yy_state_813)
+    NT_non_empty_list_semi_rev_aux_statement_ => Shift(yy_state_814)
+    NT_simple_constant => Shift(yy_state_816)
+    NT_list_commas_map_expr_elem_ => Shift(yy_state_817)
     NT_none_empty_list_semis_rev_with_trailing_info_statement_ =>
-      Shift(yy_state_811)
-    T_DOTDOT => Shift(yy_state_813)
-    NT_record_defn => Shift(yy_state_819)
-    T_MINUS => Shift(yy_state_821)
-    T_LIDENT => Shift(yy_state_825)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
-    T_RBRACE => Reduce(0, NT_list_commas_map_expr_elem_, yy_action_856)
+      Shift(yy_state_819)
+    T_DOTDOT => Shift(yy_state_821)
+    NT_record_defn => Shift(yy_state_827)
+    T_MINUS => Shift(yy_state_829)
+    T_LIDENT => Shift(yy_state_833)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
+    T_RBRACE => Reduce(0, NT_list_commas_map_expr_elem_, yy_action_868)
     _ => Error
   }
 }
@@ -28035,7 +28753,7 @@ fn yy_state_39(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(
     1,
     NT_non_empty_list_commas_rev_map_expr_elem_,
-    yy_action_855,
+    yy_action_867,
   )
 }
 
@@ -28044,14 +28762,14 @@ fn yy_state_40(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_option_COMMA_ => Shift(yy_state_41)
     T_COMMA => Shift(yy_state_42)
-    T_RBRACE => Reduce(0, NT_option_COMMA_, yy_action_865)
+    T_RBRACE => Reduce(0, NT_option_COMMA_, yy_action_877)
     _ => Error
   }
 }
 
 ///|
 fn yy_state_41(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_non_empty_list_commas_map_expr_elem_, yy_action_854)
+  ReduceNoLookahead(2, NT_non_empty_list_commas_map_expr_elem_, yy_action_866)
 }
 
 ///|
@@ -28070,7 +28788,7 @@ fn yy_state_42(_lookahead : YYSymbol) -> YYDecision {
     NT_map_syntax_key => Shift(yy_state_44)
     T_MINUS => Shift(yy_state_351)
     NT_simple_constant => Shift(yy_state_355)
-    T_RBRACE => Reduce(1, NT_option_COMMA_, yy_action_863)
+    T_RBRACE => Reduce(1, NT_option_COMMA_, yy_action_875)
     _ => Error
   }
 }
@@ -28080,7 +28798,7 @@ fn yy_state_43(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(
     3,
     NT_non_empty_list_commas_rev_map_expr_elem_,
-    yy_action_853,
+    yy_action_865,
   )
 }
 
@@ -28148,31 +28866,31 @@ fn yy_state_45(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    T_POST_LABEL => Shift(yy_state_528)
-    T_LIDENT => Shift(yy_state_530)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_POST_LABEL => Shift(yy_state_530)
+    T_LIDENT => Shift(yy_state_532)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
     _ => Error
   }
 }
 
 ///|
 fn yy_state_46(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_map_expr_elem, yy_action_852)
+  ReduceNoLookahead(3, NT_map_expr_elem, yy_action_864)
 }
 
 ///|
 fn yy_state_47(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_optional_bang => Shift(yy_state_48)
-    T_EXCLAMATION => Shift(yy_state_726)
-    T_LPAREN => Reduce(0, NT_optional_bang, yy_action_851)
+    T_EXCLAMATION => Shift(yy_state_734)
+    T_LPAREN => Reduce(0, NT_optional_bang, yy_action_863)
     _ => Error
   }
 }
@@ -28194,14 +28912,14 @@ fn yy_state_49(_lookahead : YYSymbol) -> YYDecision {
     T_NORAISE => Shift(yy_state_83)
     T_RAISE => Shift(yy_state_84)
     NT_func_return_type => Shift(yy_state_122)
-    T_LBRACE => Reduce(0, NT_func_return_type, yy_action_850)
+    T_LBRACE => Reduce(0, NT_func_return_type, yy_action_862)
     _ => Error
   }
 }
 
 ///|
 fn yy_state_50(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_func_return_type, yy_action_849)
+  ReduceNoLookahead(1, NT_func_return_type, yy_action_861)
 }
 
 ///|
@@ -28270,12 +28988,12 @@ fn yy_state_55(_lookahead : YYSymbol) -> YYDecision {
 
 ///|
 fn yy_state_56(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(5, NT_type_, yy_action_848)
+  ReduceNoLookahead(5, NT_type_, yy_action_860)
 }
 
 ///|
 fn yy_state_57(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_simple_type, yy_action_847)
+  ReduceNoLookahead(1, NT_simple_type, yy_action_859)
 }
 
 ///|
@@ -28290,7 +29008,7 @@ fn yy_state_58(_lookahead : YYSymbol) -> YYDecision {
 
 ///|
 fn yy_state_59(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_simple_type, yy_action_846)
+  ReduceNoLookahead(2, NT_simple_type, yy_action_858)
 }
 
 ///|
@@ -28320,7 +29038,7 @@ fn yy_state_61(_lookahead : YYSymbol) -> YYDecision {
     | T_LBRACE
     | T_RBRACE
     | T_AS
-    | T_NORAISE => Reduce(2, NT_simple_type, yy_action_844)
+    | T_NORAISE => Reduce(2, NT_simple_type, yy_action_856)
     _ => Error
   }
 }
@@ -28344,7 +29062,7 @@ fn yy_state_62(_lookahead : YYSymbol) -> YYDecision {
 
 ///|
 fn yy_state_63(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_non_empty_list_commas_rev_type__, yy_action_843)
+  ReduceNoLookahead(1, NT_non_empty_list_commas_rev_type__, yy_action_855)
 }
 
 ///|
@@ -28352,7 +29070,7 @@ fn yy_state_64(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_COMMA => Shift(yy_state_65)
     NT_option_COMMA_ => Shift(yy_state_102)
-    T_RPAREN | T_RBRACKET => Reduce(0, NT_option_COMMA_, yy_action_865)
+    T_RPAREN | T_RBRACKET => Reduce(0, NT_option_COMMA_, yy_action_877)
     _ => Error
   }
 }
@@ -28368,14 +29086,14 @@ fn yy_state_65(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    T_RPAREN | T_RBRACKET => Reduce(1, NT_option_COMMA_, yy_action_863)
+    T_RPAREN | T_RBRACKET => Reduce(1, NT_option_COMMA_, yy_action_875)
     _ => Error
   }
 }
 
 ///|
 fn yy_state_66(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_non_empty_list_commas_rev_type__, yy_action_842)
+  ReduceNoLookahead(3, NT_non_empty_list_commas_rev_type__, yy_action_854)
 }
 
 ///|
@@ -28396,7 +29114,7 @@ fn yy_state_67(_lookahead : YYSymbol) -> YYDecision {
     | T_LBRACE
     | T_RBRACE
     | T_AS
-    | T_NORAISE => Reduce(1, NT_simple_type, yy_action_841)
+    | T_NORAISE => Reduce(1, NT_simple_type, yy_action_853)
     _ => Error
   }
 }
@@ -28428,7 +29146,7 @@ fn yy_state_69(_lookahead : YYSymbol) -> YYDecision {
 
 ///|
 fn yy_state_70(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(4, NT_simple_type, yy_action_837)
+  ReduceNoLookahead(4, NT_simple_type, yy_action_849)
 }
 
 ///|
@@ -28473,7 +29191,7 @@ fn yy_state_73(_lookahead : YYSymbol) -> YYDecision {
 
 ///|
 fn yy_state_74(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(4, NT_type_, yy_action_836)
+  ReduceNoLookahead(4, NT_type_, yy_action_848)
 }
 
 ///|
@@ -28494,14 +29212,14 @@ fn yy_state_75(_lookahead : YYSymbol) -> YYDecision {
     | T_RBRACKET
     | T_LBRACE
     | T_RBRACE
-    | T_AS => Reduce(1, NT_type_, yy_action_835)
+    | T_AS => Reduce(1, NT_type_, yy_action_847)
     _ => Error
   }
 }
 
 ///|
 fn yy_state_76(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_return_type, yy_action_834)
+  ReduceNoLookahead(2, NT_return_type, yy_action_846)
 }
 
 ///|
@@ -28526,24 +29244,24 @@ fn yy_state_77(_lookahead : YYSymbol) -> YYDecision {
     | T_LBRACE
     | T_RBRACE
     | T_AS
-    | T_NORAISE => Reduce(2, NT_simple_type, yy_action_833)
+    | T_NORAISE => Reduce(2, NT_simple_type, yy_action_845)
     _ => Error
   }
 }
 
 ///|
 fn yy_state_78(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_error_type, yy_action_832)
+  ReduceNoLookahead(1, NT_error_type, yy_action_844)
 }
 
 ///|
 fn yy_state_79(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_error_type, yy_action_831)
+  ReduceNoLookahead(1, NT_error_type, yy_action_843)
 }
 
 ///|
 fn yy_state_80(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_return_type, yy_action_830)
+  ReduceNoLookahead(3, NT_return_type, yy_action_842)
 }
 
 ///|
@@ -28564,19 +29282,19 @@ fn yy_state_81(_lookahead : YYSymbol) -> YYDecision {
     | T_RBRACKET
     | T_LBRACE
     | T_RBRACE
-    | T_AS => Reduce(2, NT_return_type, yy_action_829)
+    | T_AS => Reduce(2, NT_return_type, yy_action_841)
     _ => Error
   }
 }
 
 ///|
 fn yy_state_82(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_return_type, yy_action_828)
+  ReduceNoLookahead(3, NT_return_type, yy_action_840)
 }
 
 ///|
 fn yy_state_83(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_error_annotation, yy_action_827)
+  ReduceNoLookahead(1, NT_error_annotation, yy_action_839)
 }
 
 ///|
@@ -28598,24 +29316,24 @@ fn yy_state_84(_lookahead : YYSymbol) -> YYDecision {
     | T_RBRACKET
     | T_LBRACE
     | T_RBRACE
-    | T_AS => Reduce(1, NT_error_annotation, yy_action_826)
+    | T_AS => Reduce(1, NT_error_annotation, yy_action_838)
     _ => Error
   }
 }
 
 ///|
 fn yy_state_85(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_error_annotation, yy_action_825)
+  ReduceNoLookahead(2, NT_error_annotation, yy_action_837)
 }
 
 ///|
 fn yy_state_86(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_error_annotation, yy_action_824)
+  ReduceNoLookahead(2, NT_error_annotation, yy_action_836)
 }
 
 ///|
 fn yy_state_87(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_return_type, yy_action_823)
+  ReduceNoLookahead(1, NT_return_type, yy_action_835)
 }
 
 ///|
@@ -28645,7 +29363,7 @@ fn yy_state_89(_lookahead : YYSymbol) -> YYDecision {
     | T_LBRACE
     | T_RBRACE
     | T_AS
-    | T_NORAISE => Reduce(3, NT_simple_type, yy_action_822)
+    | T_NORAISE => Reduce(3, NT_simple_type, yy_action_834)
     _ => Error
   }
 }
@@ -28668,7 +29386,7 @@ fn yy_state_90(_lookahead : YYSymbol) -> YYDecision {
 
 ///|
 fn yy_state_91(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(5, NT_type_, yy_action_821)
+  ReduceNoLookahead(5, NT_type_, yy_action_833)
 }
 
 ///|
@@ -28715,7 +29433,7 @@ fn yy_state_94(_lookahead : YYSymbol) -> YYDecision {
 
 ///|
 fn yy_state_95(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(6, NT_type_, yy_action_820)
+  ReduceNoLookahead(6, NT_type_, yy_action_832)
 }
 
 ///|
@@ -28744,7 +29462,7 @@ fn yy_state_97(_lookahead : YYSymbol) -> YYDecision {
     | T_LBRACE
     | T_RBRACE
     | T_AS
-    | T_NORAISE => Reduce(5, NT_simple_type, yy_action_819)
+    | T_NORAISE => Reduce(5, NT_simple_type, yy_action_831)
     _ => Error
   }
 }
@@ -28767,7 +29485,7 @@ fn yy_state_98(_lookahead : YYSymbol) -> YYDecision {
 
 ///|
 fn yy_state_99(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(7, NT_type_, yy_action_818)
+  ReduceNoLookahead(7, NT_type_, yy_action_830)
 }
 
 ///|
@@ -28783,19 +29501,19 @@ fn yy_state_100(_lookahead : YYSymbol) -> YYDecision {
     | T_SEMI
     | T_RBRACKET
     | T_RBRACE
-    | T_AS => Reduce(1, NT_type_, yy_action_835)
+    | T_AS => Reduce(1, NT_type_, yy_action_847)
     _ => Error
   }
 }
 
 ///|
 fn yy_state_101(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_simple_type, yy_action_833)
+  ReduceNoLookahead(2, NT_simple_type, yy_action_845)
 }
 
 ///|
 fn yy_state_102(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_non_empty_list_commas_type__, yy_action_817)
+  ReduceNoLookahead(2, NT_non_empty_list_commas_type__, yy_action_829)
 }
 
 ///|
@@ -28808,7 +29526,7 @@ fn yy_state_103(_lookahead : YYSymbol) -> YYDecision {
 
 ///|
 fn yy_state_104(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(5, NT_simple_type, yy_action_815)
+  ReduceNoLookahead(5, NT_simple_type, yy_action_827)
 }
 
 ///|
@@ -28829,7 +29547,7 @@ fn yy_state_105(_lookahead : YYSymbol) -> YYDecision {
     | T_LBRACE
     | T_RBRACE
     | T_AS
-    | T_NORAISE => Reduce(2, NT_simple_type, yy_action_813)
+    | T_NORAISE => Reduce(2, NT_simple_type, yy_action_825)
     _ => Error
   }
 }
@@ -28861,7 +29579,7 @@ fn yy_state_107(_lookahead : YYSymbol) -> YYDecision {
 
 ///|
 fn yy_state_108(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(5, NT_simple_type, yy_action_810)
+  ReduceNoLookahead(5, NT_simple_type, yy_action_822)
 }
 
 ///|
@@ -28899,7 +29617,7 @@ fn yy_state_111(_lookahead : YYSymbol) -> YYDecision {
 
 ///|
 fn yy_state_112(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(6, NT_type_, yy_action_809)
+  ReduceNoLookahead(6, NT_type_, yy_action_821)
 }
 
 ///|
@@ -28954,7 +29672,7 @@ fn yy_state_116(_lookahead : YYSymbol) -> YYDecision {
 
 ///|
 fn yy_state_117(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(8, NT_type_, yy_action_807)
+  ReduceNoLookahead(8, NT_type_, yy_action_819)
 }
 
 ///|
@@ -28983,12 +29701,12 @@ fn yy_state_119(_lookahead : YYSymbol) -> YYDecision {
 
 ///|
 fn yy_state_120(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(7, NT_type_, yy_action_805)
+  ReduceNoLookahead(7, NT_type_, yy_action_817)
 }
 
 ///|
 fn yy_state_121(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_func_return_type, yy_action_804)
+  ReduceNoLookahead(2, NT_func_return_type, yy_action_816)
 }
 
 ///|
@@ -29002,7 +29720,7 @@ fn yy_state_122(_lookahead : YYSymbol) -> YYDecision {
 
 ///|
 fn yy_state_123(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(5, NT_anony_fn, yy_action_803)
+  ReduceNoLookahead(5, NT_anony_fn, yy_action_815)
 }
 
 ///|
@@ -29060,43 +29778,43 @@ fn yy_state_124(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    T_POST_LABEL => Shift(yy_state_528)
-    NT_expr => Shift(yy_state_533)
-    NT_left_value => Shift(yy_state_534)
-    T_ELLIPSIS => Shift(yy_state_539)
-    T_RAISE => Shift(yy_state_540)
-    T_PACKAGE_NAME => Shift(yy_state_542)
-    T_LIDENT => Shift(yy_state_544)
-    NT_expr_statement_no_break_continue_return => Shift(yy_state_599)
-    T_RETURN => Shift(yy_state_600)
-    T_CONTINUE => Shift(yy_state_603)
-    T_BREAK => Shift(yy_state_612)
-    T_GUARD => Shift(yy_state_739)
-    NT_expr_statement => Shift(yy_state_743)
-    T_DEFER => Shift(yy_state_744)
-    NT_guard_statement => Shift(yy_state_746)
-    T_FN => Shift(yy_state_747)
-    T_ASYNC => Shift(yy_state_753)
-    T_LETREC => Shift(yy_state_760)
-    T_LET => Shift(yy_state_786)
-    NT_non_empty_list_semis_rev_statement_ => Shift(yy_state_802)
-    NT_list_semis_rev_statement_ => Shift(yy_state_803)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
-    T_RBRACE => Reduce(0, NT_list_semis_rev_statement_, yy_action_802)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_POST_LABEL => Shift(yy_state_530)
+    NT_expr => Shift(yy_state_535)
+    NT_left_value => Shift(yy_state_536)
+    T_ELLIPSIS => Shift(yy_state_541)
+    T_RAISE => Shift(yy_state_542)
+    T_PACKAGE_NAME => Shift(yy_state_544)
+    T_LIDENT => Shift(yy_state_546)
+    NT_expr_statement_no_break_continue_return => Shift(yy_state_601)
+    T_RETURN => Shift(yy_state_602)
+    T_CONTINUE => Shift(yy_state_605)
+    T_BREAK => Shift(yy_state_614)
+    T_GUARD => Shift(yy_state_747)
+    NT_expr_statement => Shift(yy_state_751)
+    T_DEFER => Shift(yy_state_752)
+    NT_guard_statement => Shift(yy_state_754)
+    T_FN => Shift(yy_state_755)
+    T_ASYNC => Shift(yy_state_761)
+    T_LETREC => Shift(yy_state_768)
+    T_LET => Shift(yy_state_794)
+    NT_non_empty_list_semis_rev_statement_ => Shift(yy_state_810)
+    NT_list_semis_rev_statement_ => Shift(yy_state_811)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
+    T_RBRACE => Reduce(0, NT_list_semis_rev_statement_, yy_action_814)
     _ => Error
   }
 }
 
 ///|
 fn yy_state_125(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_non_empty_list_semi_rev_aux_statement_, yy_action_801)
+  ReduceNoLookahead(1, NT_non_empty_list_semi_rev_aux_statement_, yy_action_813)
 }
 
 ///|
@@ -29104,14 +29822,14 @@ fn yy_state_126(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_option_SEMI_ => Shift(yy_state_127)
     T_SEMI => Shift(yy_state_128)
-    T_RBRACE => Reduce(0, NT_option_SEMI_, yy_action_800)
+    T_RBRACE => Reduce(0, NT_option_SEMI_, yy_action_812)
     _ => Error
   }
 }
 
 ///|
 fn yy_state_127(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_non_empty_list_semis_rev_statement_, yy_action_799)
+  ReduceNoLookahead(2, NT_non_empty_list_semis_rev_statement_, yy_action_811)
 }
 
 ///|
@@ -29168,41 +29886,41 @@ fn yy_state_128(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    T_POST_LABEL => Shift(yy_state_528)
-    NT_expr => Shift(yy_state_533)
-    NT_left_value => Shift(yy_state_534)
-    T_ELLIPSIS => Shift(yy_state_539)
-    T_RAISE => Shift(yy_state_540)
-    T_PACKAGE_NAME => Shift(yy_state_542)
-    T_LIDENT => Shift(yy_state_544)
-    NT_expr_statement_no_break_continue_return => Shift(yy_state_599)
-    T_RETURN => Shift(yy_state_600)
-    T_CONTINUE => Shift(yy_state_603)
-    T_BREAK => Shift(yy_state_612)
-    T_GUARD => Shift(yy_state_739)
-    NT_expr_statement => Shift(yy_state_743)
-    T_DEFER => Shift(yy_state_744)
-    NT_guard_statement => Shift(yy_state_746)
-    T_FN => Shift(yy_state_747)
-    T_ASYNC => Shift(yy_state_753)
-    T_LETREC => Shift(yy_state_760)
-    T_LET => Shift(yy_state_786)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
-    T_RBRACE => Reduce(1, NT_option_SEMI_, yy_action_798)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_POST_LABEL => Shift(yy_state_530)
+    NT_expr => Shift(yy_state_535)
+    NT_left_value => Shift(yy_state_536)
+    T_ELLIPSIS => Shift(yy_state_541)
+    T_RAISE => Shift(yy_state_542)
+    T_PACKAGE_NAME => Shift(yy_state_544)
+    T_LIDENT => Shift(yy_state_546)
+    NT_expr_statement_no_break_continue_return => Shift(yy_state_601)
+    T_RETURN => Shift(yy_state_602)
+    T_CONTINUE => Shift(yy_state_605)
+    T_BREAK => Shift(yy_state_614)
+    T_GUARD => Shift(yy_state_747)
+    NT_expr_statement => Shift(yy_state_751)
+    T_DEFER => Shift(yy_state_752)
+    NT_guard_statement => Shift(yy_state_754)
+    T_FN => Shift(yy_state_755)
+    T_ASYNC => Shift(yy_state_761)
+    T_LETREC => Shift(yy_state_768)
+    T_LET => Shift(yy_state_794)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
+    T_RBRACE => Reduce(1, NT_option_SEMI_, yy_action_810)
     _ => Error
   }
 }
 
 ///|
 fn yy_state_129(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_non_empty_list_semi_rev_aux_statement_, yy_action_797)
+  ReduceNoLookahead(3, NT_non_empty_list_semi_rev_aux_statement_, yy_action_809)
 }
 
 ///|
@@ -29225,7 +29943,7 @@ fn yy_state_131(_lookahead : YYSymbol) -> YYDecision {
 
 ///|
 fn yy_state_132(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_simple_expr, yy_action_796)
+  ReduceNoLookahead(3, NT_simple_expr, yy_action_808)
 }
 
 ///|
@@ -29235,14 +29953,14 @@ fn yy_state_133(_lookahead : YYSymbol) -> YYDecision {
     NT_non_empty_list_commas_rev_record_defn_single_ => Shift(yy_state_135)
     T_LIDENT => Shift(yy_state_139)
     NT_non_empty_list_commas_with_trailing_info_record_defn_single_ =>
-      Shift(yy_state_727)
-    T_DOTDOT => Shift(yy_state_728)
-    NT_list_commas_with_trailing_info_record_defn_single_ => Shift(yy_state_737)
+      Shift(yy_state_735)
+    T_DOTDOT => Shift(yy_state_736)
+    NT_list_commas_with_trailing_info_record_defn_single_ => Shift(yy_state_745)
     T_RBRACE =>
       Reduce(
         0,
         NT_list_commas_with_trailing_info_record_defn_single_,
-        yy_action_795,
+        yy_action_807,
       )
     _ => Error
   }
@@ -29253,7 +29971,7 @@ fn yy_state_134(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(
     1,
     NT_non_empty_list_commas_rev_record_defn_single_,
-    yy_action_794,
+    yy_action_806,
   )
 }
 
@@ -29262,7 +29980,7 @@ fn yy_state_135(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_option_COMMA_ => Shift(yy_state_136)
     T_COMMA => Shift(yy_state_137)
-    T_RBRACE => Reduce(0, NT_option_COMMA_, yy_action_865)
+    T_RBRACE => Reduce(0, NT_option_COMMA_, yy_action_877)
     _ => Error
   }
 }
@@ -29272,7 +29990,7 @@ fn yy_state_136(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(
     2,
     NT_non_empty_list_commas_with_trailing_info_record_defn_single_,
-    yy_action_793,
+    yy_action_805,
   )
 }
 
@@ -29281,7 +29999,7 @@ fn yy_state_137(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_record_defn_single => Shift(yy_state_138)
     T_LIDENT => Shift(yy_state_139)
-    T_RBRACE => Reduce(1, NT_option_COMMA_, yy_action_863)
+    T_RBRACE => Reduce(1, NT_option_COMMA_, yy_action_875)
     _ => Error
   }
 }
@@ -29291,7 +30009,7 @@ fn yy_state_138(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(
     3,
     NT_non_empty_list_commas_rev_record_defn_single_,
-    yy_action_792,
+    yy_action_804,
   )
 }
 
@@ -29299,7 +30017,7 @@ fn yy_state_138(_lookahead : YYSymbol) -> YYDecision {
 fn yy_state_139(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_COLON => Shift(yy_state_140)
-    T_COMMA | T_RBRACE => Reduce(1, NT_record_defn_single, yy_action_791)
+    T_COMMA | T_RBRACE => Reduce(1, NT_record_defn_single, yy_action_803)
     _ => Error
   }
 }
@@ -29360,23 +30078,23 @@ fn yy_state_140(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    T_POST_LABEL => Shift(yy_state_528)
-    T_LIDENT => Shift(yy_state_530)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_POST_LABEL => Shift(yy_state_530)
+    T_LIDENT => Shift(yy_state_532)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
     _ => Error
   }
 }
 
 ///|
 fn yy_state_141(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_record_defn_single, yy_action_790)
+  ReduceNoLookahead(3, NT_record_defn_single, yy_action_802)
 }
 
 ///|
@@ -29391,8 +30109,8 @@ fn yy_state_142(_lookahead : YYSymbol) -> YYDecision {
 fn yy_state_143(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_optional_bang => Shift(yy_state_144)
-    T_EXCLAMATION => Shift(yy_state_726)
-    T_LPAREN => Reduce(0, NT_optional_bang, yy_action_851)
+    T_EXCLAMATION => Shift(yy_state_734)
+    T_LPAREN => Reduce(0, NT_optional_bang, yy_action_863)
     _ => Error
   }
 }
@@ -29414,7 +30132,7 @@ fn yy_state_145(_lookahead : YYSymbol) -> YYDecision {
     T_NORAISE => Shift(yy_state_83)
     T_RAISE => Shift(yy_state_84)
     NT_func_return_type => Shift(yy_state_146)
-    T_LBRACE => Reduce(0, NT_func_return_type, yy_action_850)
+    T_LBRACE => Reduce(0, NT_func_return_type, yy_action_862)
     _ => Error
   }
 }
@@ -29430,7 +30148,7 @@ fn yy_state_146(_lookahead : YYSymbol) -> YYDecision {
 
 ///|
 fn yy_state_147(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(6, NT_anony_fn, yy_action_789)
+  ReduceNoLookahead(6, NT_anony_fn, yy_action_801)
 }
 
 ///|
@@ -29439,18 +30157,18 @@ fn yy_state_148(_lookahead : YYSymbol) -> YYDecision {
     NT_parameter => Shift(yy_state_149)
     NT_non_empty_list_commas_rev_parameter_ => Shift(yy_state_150)
     T_POST_LABEL => Shift(yy_state_154)
-    T_LIDENT => Shift(yy_state_710)
-    T_UNDERSCORE => Shift(yy_state_720)
-    NT_non_empty_list_commas_parameter_ => Shift(yy_state_723)
-    NT_list_commas_parameter_ => Shift(yy_state_724)
-    T_RPAREN => Reduce(0, NT_list_commas_parameter_, yy_action_788)
+    T_LIDENT => Shift(yy_state_718)
+    T_UNDERSCORE => Shift(yy_state_728)
+    NT_non_empty_list_commas_parameter_ => Shift(yy_state_731)
+    NT_list_commas_parameter_ => Shift(yy_state_732)
+    T_RPAREN => Reduce(0, NT_list_commas_parameter_, yy_action_800)
     _ => Error
   }
 }
 
 ///|
 fn yy_state_149(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_non_empty_list_commas_rev_parameter_, yy_action_787)
+  ReduceNoLookahead(1, NT_non_empty_list_commas_rev_parameter_, yy_action_799)
 }
 
 ///|
@@ -29458,14 +30176,14 @@ fn yy_state_150(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_option_COMMA_ => Shift(yy_state_151)
     T_COMMA => Shift(yy_state_152)
-    T_RPAREN => Reduce(0, NT_option_COMMA_, yy_action_865)
+    T_RPAREN => Reduce(0, NT_option_COMMA_, yy_action_877)
     _ => Error
   }
 }
 
 ///|
 fn yy_state_151(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_non_empty_list_commas_parameter_, yy_action_786)
+  ReduceNoLookahead(2, NT_non_empty_list_commas_parameter_, yy_action_798)
 }
 
 ///|
@@ -29473,24 +30191,24 @@ fn yy_state_152(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_parameter => Shift(yy_state_153)
     T_POST_LABEL => Shift(yy_state_154)
-    T_LIDENT => Shift(yy_state_710)
-    T_UNDERSCORE => Shift(yy_state_720)
-    T_RPAREN => Reduce(1, NT_option_COMMA_, yy_action_863)
+    T_LIDENT => Shift(yy_state_718)
+    T_UNDERSCORE => Shift(yy_state_728)
+    T_RPAREN => Reduce(1, NT_option_COMMA_, yy_action_875)
     _ => Error
   }
 }
 
 ///|
 fn yy_state_153(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_non_empty_list_commas_rev_parameter_, yy_action_785)
+  ReduceNoLookahead(3, NT_non_empty_list_commas_rev_parameter_, yy_action_797)
 }
 
 ///|
 fn yy_state_154(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_EQUAL => Shift(yy_state_155)
-    T_COLON => Shift(yy_state_706)
-    T_RPAREN | T_COMMA => Reduce(1, NT_parameter, yy_action_783)
+    T_COLON => Shift(yy_state_714)
+    T_RPAREN | T_COMMA => Reduce(1, NT_parameter, yy_action_795)
     _ => Error
   }
 }
@@ -29550,17 +30268,17 @@ fn yy_state_155(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    T_POST_LABEL => Shift(yy_state_528)
-    T_LIDENT => Shift(yy_state_530)
-    NT_expr => Shift(yy_state_705)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_POST_LABEL => Shift(yy_state_530)
+    T_LIDENT => Shift(yy_state_532)
+    NT_expr => Shift(yy_state_713)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
     _ => Error
   }
 }
@@ -29571,10 +30289,10 @@ fn yy_state_156(_lookahead : YYSymbol) -> YYDecision {
     T_DOT_INT => Shift(yy_state_157)
     T_DOTDOT => Shift(yy_state_158)
     T_QUESTION => Shift(yy_state_410)
-    T_EXCLAMATION => Shift(yy_state_647)
-    T_LPAREN => Shift(yy_state_651)
-    T_DOT_LIDENT => Shift(yy_state_701)
-    T_LBRACKET => Shift(yy_state_702)
+    T_EXCLAMATION => Shift(yy_state_655)
+    T_LPAREN => Shift(yy_state_659)
+    T_DOT_LIDENT => Shift(yy_state_709)
+    T_LBRACKET => Shift(yy_state_710)
     T_INFIX1
     | T_INFIX2
     | T_INFIX3
@@ -29607,14 +30325,14 @@ fn yy_state_156(_lookahead : YYSymbol) -> YYDecision {
     | T_RANGE_EXCLUSIVE_REV
     | T_IS
     | T_AND
-    | T_LEXMATCH_QUESTION => Reduce(1, NT_prefix_expr, yy_action_782)
+    | T_LEXMATCH_QUESTION => Reduce(1, NT_prefix_expr, yy_action_794)
     _ => Error
   }
 }
 
 ///|
 fn yy_state_157(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_simple_expr, yy_action_781)
+  ReduceNoLookahead(2, NT_simple_expr, yy_action_793)
 }
 
 ///|
@@ -29629,8 +30347,8 @@ fn yy_state_158(_lookahead : YYSymbol) -> YYDecision {
 fn yy_state_159(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_QUESTION => Shift(yy_state_160)
-    T_EXCLAMATION => Shift(yy_state_694)
-    T_LPAREN => Shift(yy_state_698)
+    T_EXCLAMATION => Shift(yy_state_702)
+    T_LPAREN => Shift(yy_state_706)
     _ => Error
   }
 }
@@ -29702,25 +30420,25 @@ fn yy_state_161(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    T_POST_LABEL => Shift(yy_state_639)
-    T_LIDENT => Shift(yy_state_642)
-    NT_list_commas_argument_ => Shift(yy_state_692)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
-    T_RPAREN => Reduce(0, NT_list_commas_argument_, yy_action_780)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_POST_LABEL => Shift(yy_state_647)
+    T_LIDENT => Shift(yy_state_650)
+    NT_list_commas_argument_ => Shift(yy_state_700)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
+    T_RPAREN => Reduce(0, NT_list_commas_argument_, yy_action_792)
     _ => Error
   }
 }
 
 ///|
 fn yy_state_162(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_non_empty_list_commas_rev_argument_, yy_action_779)
+  ReduceNoLookahead(1, NT_non_empty_list_commas_rev_argument_, yy_action_791)
 }
 
 ///|
@@ -29728,14 +30446,14 @@ fn yy_state_163(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_option_COMMA_ => Shift(yy_state_164)
     T_COMMA => Shift(yy_state_165)
-    T_RPAREN => Reduce(0, NT_option_COMMA_, yy_action_865)
+    T_RPAREN => Reduce(0, NT_option_COMMA_, yy_action_877)
     _ => Error
   }
 }
 
 ///|
 fn yy_state_164(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_non_empty_list_commas_argument_, yy_action_778)
+  ReduceNoLookahead(2, NT_non_empty_list_commas_argument_, yy_action_790)
 }
 
 ///|
@@ -29795,29 +30513,29 @@ fn yy_state_165(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    T_POST_LABEL => Shift(yy_state_639)
-    T_LIDENT => Shift(yy_state_642)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
-    T_RPAREN => Reduce(1, NT_option_COMMA_, yy_action_863)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_POST_LABEL => Shift(yy_state_647)
+    T_LIDENT => Shift(yy_state_650)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
+    T_RPAREN => Reduce(1, NT_option_COMMA_, yy_action_875)
     _ => Error
   }
 }
 
 ///|
 fn yy_state_166(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_non_empty_list_commas_rev_argument_, yy_action_777)
+  ReduceNoLookahead(3, NT_non_empty_list_commas_rev_argument_, yy_action_789)
 }
 
 ///|
 fn yy_state_167(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_argument, yy_action_776)
+  ReduceNoLookahead(1, NT_argument, yy_action_788)
 }
 
 ///|
@@ -29859,14 +30577,14 @@ fn yy_state_168(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_188)
     T_PACKAGE_NAME => Shift(yy_state_189)
     T_LIDENT => Shift(yy_state_192)
-    NT_prefix_expr => Shift(yy_state_691)
+    NT_prefix_expr => Shift(yy_state_699)
     _ => Error
   }
 }
 
 ///|
 fn yy_state_169(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_simple_expr, yy_action_775)
+  ReduceNoLookahead(1, NT_simple_expr, yy_action_787)
 }
 
 ///|
@@ -29928,39 +30646,39 @@ fn yy_state_170(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    T_POST_LABEL => Shift(yy_state_528)
-    T_UNDERSCORE => Shift(yy_state_675)
-    T_LIDENT => Shift(yy_state_687)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_POST_LABEL => Shift(yy_state_530)
+    T_UNDERSCORE => Shift(yy_state_683)
+    T_LIDENT => Shift(yy_state_695)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
     _ => Error
   }
 }
 
 ///|
 fn yy_state_171(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_tuple_expr, yy_action_774)
+  ReduceNoLookahead(2, NT_tuple_expr, yy_action_786)
 }
 
 ///|
 fn yy_state_172(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_tuple_expr, yy_action_773)
+  ReduceNoLookahead(2, NT_tuple_expr, yy_action_785)
 }
 
 ///|
 fn yy_state_173(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_tuple_expr, yy_action_772)
+  ReduceNoLookahead(2, NT_tuple_expr, yy_action_784)
 }
 
 ///|
 fn yy_state_174(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_non_empty_tuple_elems_with_prefix, yy_action_771)
+  ReduceNoLookahead(1, NT_non_empty_tuple_elems_with_prefix, yy_action_783)
 }
 
 ///|
@@ -29998,7 +30716,7 @@ fn yy_state_177(_lookahead : YYSymbol) -> YYDecision {
 
 ///|
 fn yy_state_178(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(5, NT_tuple_expr, yy_action_770)
+  ReduceNoLookahead(5, NT_tuple_expr, yy_action_782)
 }
 
 ///|
@@ -30059,28 +30777,28 @@ fn yy_state_179(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    T_POST_LABEL => Shift(yy_state_528)
-    T_LIDENT => Shift(yy_state_530)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_POST_LABEL => Shift(yy_state_530)
+    T_LIDENT => Shift(yy_state_532)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
     _ => Error
   }
 }
 
 ///|
 fn yy_state_180(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_non_empty_tuple_elems, yy_action_769)
+  ReduceNoLookahead(3, NT_non_empty_tuple_elems, yy_action_781)
 }
 
 ///|
 fn yy_state_181(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_non_empty_tuple_elems, yy_action_768)
+  ReduceNoLookahead(3, NT_non_empty_tuple_elems, yy_action_780)
 }
 
 ///|
@@ -30094,7 +30812,7 @@ fn yy_state_182(_lookahead : YYSymbol) -> YYDecision {
 
 ///|
 fn yy_state_183(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_non_empty_tuple_elems, yy_action_767)
+  ReduceNoLookahead(2, NT_non_empty_tuple_elems, yy_action_779)
 }
 
 ///|
@@ -30143,7 +30861,7 @@ fn yy_state_184(_lookahead : YYSymbol) -> YYDecision {
 
 ///|
 fn yy_state_185(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_prefix_expr, yy_action_764)
+  ReduceNoLookahead(2, NT_prefix_expr, yy_action_776)
 }
 
 ///|
@@ -30192,13 +30910,13 @@ fn yy_state_186(_lookahead : YYSymbol) -> YYDecision {
 
 ///|
 fn yy_state_187(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_prefix_expr, yy_action_761)
+  ReduceNoLookahead(2, NT_prefix_expr, yy_action_773)
 }
 
 ///|
 fn yy_state_188(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLONCOLON => Reduce(1, NT_qual_ident_ty, yy_action_870)
+    T_COLONCOLON => Reduce(1, NT_qual_ident_ty, yy_action_882)
     T_INFIX1
     | T_INFIX2
     | T_INFIX3
@@ -30240,7 +30958,7 @@ fn yy_state_188(_lookahead : YYSymbol) -> YYDecision {
     | T_RANGE_EXCLUSIVE_REV
     | T_IS
     | T_AND
-    | T_LEXMATCH_QUESTION => Reduce(1, NT_constr, yy_action_760)
+    | T_LEXMATCH_QUESTION => Reduce(1, NT_constr, yy_action_772)
     _ => Error
   }
 }
@@ -30257,7 +30975,7 @@ fn yy_state_189(_lookahead : YYSymbol) -> YYDecision {
 ///|
 fn yy_state_190(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLONCOLON => Reduce(2, NT_qual_ident_ty, yy_action_872)
+    T_COLONCOLON => Reduce(2, NT_qual_ident_ty, yy_action_884)
     T_INFIX1
     | T_INFIX2
     | T_INFIX3
@@ -30299,7 +31017,7 @@ fn yy_state_190(_lookahead : YYSymbol) -> YYDecision {
     | T_RANGE_EXCLUSIVE_REV
     | T_IS
     | T_AND
-    | T_LEXMATCH_QUESTION => Reduce(2, NT_constr, yy_action_759)
+    | T_LEXMATCH_QUESTION => Reduce(2, NT_constr, yy_action_771)
     _ => Error
   }
 }
@@ -30346,8 +31064,8 @@ fn yy_state_191(_lookahead : YYSymbol) -> YYDecision {
     | T_RANGE_EXCLUSIVE_REV
     | T_IS
     | T_AND
-    | T_LEXMATCH_QUESTION => Reduce(2, NT_qual_ident_simple_expr, yy_action_758)
-    T_COLONCOLON => Reduce(2, NT_qual_ident_ty, yy_action_871)
+    | T_LEXMATCH_QUESTION => Reduce(2, NT_qual_ident_simple_expr, yy_action_770)
+    T_COLONCOLON => Reduce(2, NT_qual_ident_ty, yy_action_883)
     _ => Error
   }
 }
@@ -30394,7 +31112,7 @@ fn yy_state_192(_lookahead : YYSymbol) -> YYDecision {
     | T_RANGE_EXCLUSIVE_REV
     | T_IS
     | T_AND
-    | T_LEXMATCH_QUESTION => Reduce(1, NT_qual_ident_simple_expr, yy_action_757)
+    | T_LEXMATCH_QUESTION => Reduce(1, NT_qual_ident_simple_expr, yy_action_769)
     _ => Error
   }
 }
@@ -30467,24 +31185,24 @@ fn yy_state_194(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    T_POST_LABEL => Shift(yy_state_639)
-    T_LIDENT => Shift(yy_state_642)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
-    T_RPAREN => Reduce(0, NT_list_commas_argument_, yy_action_780)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_POST_LABEL => Shift(yy_state_647)
+    T_LIDENT => Shift(yy_state_650)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
+    T_RPAREN => Reduce(0, NT_list_commas_argument_, yy_action_792)
     _ => Error
   }
 }
 
 ///|
 fn yy_state_195(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_list_commas_argument_, yy_action_756)
+  ReduceNoLookahead(1, NT_list_commas_argument_, yy_action_768)
 }
 
 ///|
@@ -30497,7 +31215,7 @@ fn yy_state_196(_lookahead : YYSymbol) -> YYDecision {
 
 ///|
 fn yy_state_197(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(5, NT_simple_expr, yy_action_755)
+  ReduceNoLookahead(5, NT_simple_expr, yy_action_767)
 }
 
 ///|
@@ -30535,7 +31253,7 @@ fn yy_state_198(_lookahead : YYSymbol) -> YYDecision {
     | T_FAT_ARROW
     | T_IS
     | T_AND
-    | T_LEXMATCH_QUESTION => Reduce(1, NT_range_expr, yy_action_754)
+    | T_LEXMATCH_QUESTION => Reduce(1, NT_range_expr, yy_action_766)
     _ => Error
   }
 }
@@ -30586,7 +31304,7 @@ fn yy_state_199(_lookahead : YYSymbol) -> YYDecision {
 
 ///|
 fn yy_state_200(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_range_expr, yy_action_753)
+  ReduceNoLookahead(3, NT_range_expr, yy_action_765)
 }
 
 ///|
@@ -30635,7 +31353,7 @@ fn yy_state_201(_lookahead : YYSymbol) -> YYDecision {
 
 ///|
 fn yy_state_202(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_range_expr, yy_action_752)
+  ReduceNoLookahead(3, NT_range_expr, yy_action_764)
 }
 
 ///|
@@ -30684,7 +31402,7 @@ fn yy_state_203(_lookahead : YYSymbol) -> YYDecision {
 
 ///|
 fn yy_state_204(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_range_expr, yy_action_751)
+  ReduceNoLookahead(3, NT_range_expr, yy_action_763)
 }
 
 ///|
@@ -30733,7 +31451,7 @@ fn yy_state_205(_lookahead : YYSymbol) -> YYDecision {
 
 ///|
 fn yy_state_206(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_range_expr, yy_action_750)
+  ReduceNoLookahead(3, NT_range_expr, yy_action_762)
 }
 
 ///|
@@ -30782,7 +31500,7 @@ fn yy_state_207(_lookahead : YYSymbol) -> YYDecision {
 
 ///|
 fn yy_state_208(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_range_expr, yy_action_749)
+  ReduceNoLookahead(3, NT_range_expr, yy_action_761)
 }
 
 ///|
@@ -30815,7 +31533,7 @@ fn yy_state_209(_lookahead : YYSymbol) -> YYDecision {
     | T_PIPE
     | T_ELSE
     | T_FAT_ARROW
-    | T_AND => Reduce(1, NT_postfix_expr, yy_action_748)
+    | T_AND => Reduce(1, NT_postfix_expr, yy_action_760)
     _ => Error
   }
 }
@@ -30863,7 +31581,7 @@ fn yy_state_211(_lookahead : YYSymbol) -> YYDecision {
     | T_PIPE
     | T_ELSE
     | T_FAT_ARROW
-    | T_AND => Reduce(3, NT_postfix_expr, yy_action_747)
+    | T_AND => Reduce(3, NT_postfix_expr, yy_action_759)
     _ => Error
   }
 }
@@ -30878,42 +31596,42 @@ fn yy_state_212(_lookahead : YYSymbol) -> YYDecision {
 
 ///|
 fn yy_state_213(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(5, NT_postfix_expr, yy_action_746)
+  ReduceNoLookahead(5, NT_postfix_expr, yy_action_758)
 }
 
 ///|
 fn yy_state_214(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_lex_simple_atom_pattern, yy_action_745)
+  ReduceNoLookahead(1, NT_lex_simple_atom_pattern, yy_action_757)
 }
 
 ///|
 fn yy_state_215(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_lex_simple_atom_pattern, yy_action_744)
+  ReduceNoLookahead(1, NT_lex_simple_atom_pattern, yy_action_756)
 }
 
 ///|
 fn yy_state_216(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_lex_simple_atom_pattern, yy_action_743)
+  ReduceNoLookahead(1, NT_lex_simple_atom_pattern, yy_action_755)
 }
 
 ///|
 fn yy_state_217(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_lex_simple_atom_pattern, yy_action_742)
+  ReduceNoLookahead(1, NT_lex_simple_atom_pattern, yy_action_754)
 }
 
 ///|
 fn yy_state_218(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_lex_pattern, yy_action_741)
+  ReduceNoLookahead(1, NT_lex_pattern, yy_action_753)
 }
 
 ///|
 fn yy_state_219(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_lex_pattern, yy_action_740)
+  ReduceNoLookahead(1, NT_lex_pattern, yy_action_752)
 }
 
 ///|
 fn yy_state_220(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_lex_pattern, yy_action_739)
+  ReduceNoLookahead(1, NT_lex_pattern, yy_action_751)
 }
 
 ///|
@@ -30944,7 +31662,7 @@ fn yy_state_222(_lookahead : YYSymbol) -> YYDecision {
       Reduce(
         1,
         NT_separated_nonempty_list_COMMA_lex_top_pattern_,
-        yy_action_738,
+        yy_action_750,
       )
     _ => Error
   }
@@ -30975,7 +31693,7 @@ fn yy_state_224(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(
     3,
     NT_separated_nonempty_list_COMMA_lex_top_pattern_,
-    yy_action_737,
+    yy_action_749,
   )
 }
 
@@ -31005,12 +31723,12 @@ fn yy_state_226(_lookahead : YYSymbol) -> YYDecision {
 
 ///|
 fn yy_state_227(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_lex_atom_pattern, yy_action_736)
+  ReduceNoLookahead(3, NT_lex_atom_pattern, yy_action_748)
 }
 
 ///|
 fn yy_state_228(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_lex_atom_pattern, yy_action_735)
+  ReduceNoLookahead(1, NT_lex_atom_pattern, yy_action_747)
 }
 
 ///|
@@ -31020,15 +31738,15 @@ fn yy_state_229(_lookahead : YYSymbol) -> YYDecision {
     NT_option_SEMI_ => Shift(yy_state_231)
     T_AS => Shift(yy_state_234)
     T_STRING | T_INTERP | T_REGEX_LITERAL | T_REGEX_INTERP | T_LPAREN =>
-      Reduce(0, NT_option_SEMI_, yy_action_800)
-    T_RPAREN | T_COMMA => Reduce(1, NT_lex_pattern_sequence, yy_action_734)
+      Reduce(0, NT_option_SEMI_, yy_action_812)
+    T_RPAREN | T_COMMA => Reduce(1, NT_lex_pattern_sequence, yy_action_746)
     _ => Error
   }
 }
 
 ///|
 fn yy_state_230(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_option_SEMI_, yy_action_798)
+  ReduceNoLookahead(1, NT_option_SEMI_, yy_action_810)
 }
 
 ///|
@@ -31048,7 +31766,7 @@ fn yy_state_231(_lookahead : YYSymbol) -> YYDecision {
 
 ///|
 fn yy_state_232(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_lex_pattern_sequence, yy_action_733)
+  ReduceNoLookahead(3, NT_lex_pattern_sequence, yy_action_745)
 }
 
 ///|
@@ -31057,8 +31775,8 @@ fn yy_state_233(_lookahead : YYSymbol) -> YYDecision {
     T_SEMI => Shift(yy_state_230)
     NT_option_SEMI_ => Shift(yy_state_231)
     T_STRING | T_INTERP | T_REGEX_LITERAL | T_REGEX_INTERP | T_LPAREN =>
-      Reduce(0, NT_option_SEMI_, yy_action_800)
-    T_RPAREN | T_COMMA => Reduce(1, NT_lex_pattern_sequence, yy_action_734)
+      Reduce(0, NT_option_SEMI_, yy_action_812)
+    T_RPAREN | T_COMMA => Reduce(1, NT_lex_pattern_sequence, yy_action_746)
     _ => Error
   }
 }
@@ -31073,27 +31791,27 @@ fn yy_state_234(_lookahead : YYSymbol) -> YYDecision {
 
 ///|
 fn yy_state_235(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_lex_as_pattern, yy_action_732)
+  ReduceNoLookahead(3, NT_lex_as_pattern, yy_action_744)
 }
 
 ///|
 fn yy_state_236(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_lex_as_pattern, yy_action_731)
+  ReduceNoLookahead(1, NT_lex_as_pattern, yy_action_743)
 }
 
 ///|
 fn yy_state_237(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_lex_top_pattern, yy_action_730)
+  ReduceNoLookahead(1, NT_lex_top_pattern, yy_action_742)
 }
 
 ///|
 fn yy_state_238(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_lex_top_pattern, yy_action_729)
+  ReduceNoLookahead(1, NT_lex_top_pattern, yy_action_741)
 }
 
 ///|
 fn yy_state_239(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_lex_top_pattern, yy_action_728)
+  ReduceNoLookahead(1, NT_lex_top_pattern, yy_action_740)
 }
 
 ///|
@@ -31106,7 +31824,7 @@ fn yy_state_240(_lookahead : YYSymbol) -> YYDecision {
 
 ///|
 fn yy_state_241(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_lex_pattern, yy_action_727)
+  ReduceNoLookahead(3, NT_lex_pattern, yy_action_739)
 }
 
 ///|
@@ -31175,7 +31893,7 @@ fn yy_state_244(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_option_QUESTION_ => Shift(yy_state_245)
     T_QUESTION => Shift(yy_state_342)
-    T_COLON => Reduce(0, NT_option_QUESTION_, yy_action_726)
+    T_COLON => Reduce(0, NT_option_QUESTION_, yy_action_738)
     _ => Error
   }
 }
@@ -31252,7 +31970,7 @@ fn yy_state_247(_lookahead : YYSymbol) -> YYDecision {
     NT_array_sub_pattern => Shift(yy_state_331)
     T_DOTDOT => Shift(yy_state_334)
     NT_array_sub_patterns => Shift(yy_state_339)
-    T_RBRACKET => Reduce(0, NT_array_sub_patterns, yy_action_725)
+    T_RBRACKET => Reduce(0, NT_array_sub_patterns, yy_action_737)
     _ => Error
   }
 }
@@ -31261,7 +31979,7 @@ fn yy_state_247(_lookahead : YYSymbol) -> YYDecision {
 fn yy_state_248(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_COMMA => Shift(yy_state_249)
-    T_RBRACKET => Reduce(1, NT_array_sub_patterns, yy_action_724)
+    T_RBRACKET => Reduce(1, NT_array_sub_patterns, yy_action_736)
     _ => Error
   }
 }
@@ -31298,7 +32016,7 @@ fn yy_state_249(_lookahead : YYSymbol) -> YYDecision {
     NT_or_pattern => Shift(yy_state_306)
     NT_pattern => Shift(yy_state_329)
     NT_non_empty_list_commas_array_sub_pattern_ => Shift(yy_state_330)
-    T_RBRACKET => Reduce(2, NT_array_sub_patterns, yy_action_723)
+    T_RBRACKET => Reduce(2, NT_array_sub_patterns, yy_action_735)
     _ => Error
   }
 }
@@ -31308,7 +32026,7 @@ fn yy_state_250(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(
     1,
     NT_non_empty_list_commas_rev_array_sub_pattern_,
-    yy_action_722,
+    yy_action_734,
   )
 }
 
@@ -31317,7 +32035,7 @@ fn yy_state_251(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_option_COMMA_ => Shift(yy_state_252)
     T_COMMA => Shift(yy_state_253)
-    T_RBRACKET => Reduce(0, NT_option_COMMA_, yy_action_865)
+    T_RBRACKET => Reduce(0, NT_option_COMMA_, yy_action_877)
     _ => Error
   }
 }
@@ -31327,7 +32045,7 @@ fn yy_state_252(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(
     2,
     NT_non_empty_list_commas_array_sub_pattern_,
-    yy_action_721,
+    yy_action_733,
   )
 }
 
@@ -31361,7 +32079,7 @@ fn yy_state_253(_lookahead : YYSymbol) -> YYDecision {
     NT_range_pattern => Shift(yy_state_303)
     NT_or_pattern => Shift(yy_state_306)
     NT_pattern => Shift(yy_state_329)
-    T_RBRACKET => Reduce(1, NT_option_COMMA_, yy_action_863)
+    T_RBRACKET => Reduce(1, NT_option_COMMA_, yy_action_875)
     _ => Error
   }
 }
@@ -31371,7 +32089,7 @@ fn yy_state_254(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(
     3,
     NT_non_empty_list_commas_rev_array_sub_pattern_,
-    yy_action_720,
+    yy_action_732,
   )
 }
 
@@ -31396,22 +32114,22 @@ fn yy_state_256(_lookahead : YYSymbol) -> YYDecision {
 
 ///|
 fn yy_state_257(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_array_sub_pattern, yy_action_719)
+  ReduceNoLookahead(3, NT_array_sub_pattern, yy_action_731)
 }
 
 ///|
 fn yy_state_258(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_array_sub_pattern, yy_action_718)
+  ReduceNoLookahead(2, NT_array_sub_pattern, yy_action_730)
 }
 
 ///|
 fn yy_state_259(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_array_sub_pattern, yy_action_717)
+  ReduceNoLookahead(2, NT_array_sub_pattern, yy_action_729)
 }
 
 ///|
 fn yy_state_260(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_array_sub_pattern, yy_action_716)
+  ReduceNoLookahead(2, NT_array_sub_pattern, yy_action_728)
 }
 
 ///|
@@ -31485,7 +32203,7 @@ fn yy_state_262(_lookahead : YYSymbol) -> YYDecision {
       Reduce(
         0,
         NT_option_delimited_LPAREN_constr_pat_arguments_RPAREN__,
-        yy_action_715,
+        yy_action_727,
       )
     _ => Error
   }
@@ -31540,13 +32258,13 @@ fn yy_state_265(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(
     3,
     NT_option_delimited_LPAREN_constr_pat_arguments_RPAREN__,
-    yy_action_713,
+    yy_action_725,
   )
 }
 
 ///|
 fn yy_state_266(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_constr_pat_argument, yy_action_712)
+  ReduceNoLookahead(1, NT_constr_pat_argument, yy_action_724)
 }
 
 ///|
@@ -31554,19 +32272,19 @@ fn yy_state_267(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_COMMA => Shift(yy_state_268)
     NT_option_COMMA_ => Shift(yy_state_269)
-    T_RPAREN => Reduce(0, NT_option_COMMA_, yy_action_865)
+    T_RPAREN => Reduce(0, NT_option_COMMA_, yy_action_877)
     _ => Error
   }
 }
 
 ///|
 fn yy_state_268(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_option_COMMA_, yy_action_863)
+  ReduceNoLookahead(1, NT_option_COMMA_, yy_action_875)
 }
 
 ///|
 fn yy_state_269(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_constr_pat_arguments, yy_action_711)
+  ReduceNoLookahead(2, NT_constr_pat_arguments, yy_action_723)
 }
 
 ///|
@@ -31574,7 +32292,7 @@ fn yy_state_270(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_COMMA => Shift(yy_state_271)
     NT_option_COMMA_ => Shift(yy_state_314)
-    T_RPAREN => Reduce(0, NT_option_COMMA_, yy_action_865)
+    T_RPAREN => Reduce(0, NT_option_COMMA_, yy_action_877)
     _ => Error
   }
 }
@@ -31611,14 +32329,14 @@ fn yy_state_271(_lookahead : YYSymbol) -> YYDecision {
     NT_range_pattern => Shift(yy_state_303)
     NT_or_pattern => Shift(yy_state_306)
     NT_pattern => Shift(yy_state_307)
-    T_RPAREN => Reduce(1, NT_option_COMMA_, yy_action_863)
+    T_RPAREN => Reduce(1, NT_option_COMMA_, yy_action_875)
     _ => Error
   }
 }
 
 ///|
 fn yy_state_272(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_constr_pat_arguments, yy_action_710)
+  ReduceNoLookahead(3, NT_constr_pat_arguments, yy_action_722)
 }
 
 ///|
@@ -31627,7 +32345,7 @@ fn yy_state_273(_lookahead : YYSymbol) -> YYDecision {
     T_EQUAL => Shift(yy_state_274)
     T_LPAREN => Shift(yy_state_276)
     T_RPAREN | T_COMMA | T_BAR | T_AS | T_RANGE_INCLUSIVE | T_RANGE_EXCLUSIVE =>
-      Reduce(1, NT_simple_pattern, yy_action_709)
+      Reduce(1, NT_simple_pattern, yy_action_721)
     _ => Error
   }
 }
@@ -31697,7 +32415,7 @@ fn yy_state_275(_lookahead : YYSymbol) -> YYDecision {
     | T_FAT_ARROW
     | T_RANGE_INCLUSIVE
     | T_RANGE_EXCLUSIVE
-    | T_AND => Reduce(1, NT_simple_pattern, yy_action_709)
+    | T_AND => Reduce(1, NT_simple_pattern, yy_action_721)
     _ => Error
   }
 }
@@ -31742,7 +32460,7 @@ fn yy_state_277(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_COMMA => Shift(yy_state_278)
     NT_option_COMMA_ => Shift(yy_state_310)
-    T_RPAREN => Reduce(0, NT_option_COMMA_, yy_action_865)
+    T_RPAREN => Reduce(0, NT_option_COMMA_, yy_action_877)
     _ => Error
   }
 }
@@ -31778,29 +32496,29 @@ fn yy_state_278(_lookahead : YYSymbol) -> YYDecision {
     NT_range_pattern => Shift(yy_state_303)
     NT_or_pattern => Shift(yy_state_306)
     NT_pattern => Shift(yy_state_307)
-    T_RPAREN => Reduce(1, NT_option_COMMA_, yy_action_863)
+    T_RPAREN => Reduce(1, NT_option_COMMA_, yy_action_875)
     _ => Error
   }
 }
 
 ///|
 fn yy_state_279(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_constr_pat_arguments_no_open, yy_action_708)
+  ReduceNoLookahead(3, NT_constr_pat_arguments_no_open, yy_action_720)
 }
 
 ///|
 fn yy_state_280(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_simple_pattern, yy_action_707)
+  ReduceNoLookahead(1, NT_simple_pattern, yy_action_719)
 }
 
 ///|
 fn yy_state_281(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_simple_pattern, yy_action_706)
+  ReduceNoLookahead(1, NT_simple_pattern, yy_action_718)
 }
 
 ///|
 fn yy_state_282(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_simple_pattern, yy_action_705)
+  ReduceNoLookahead(1, NT_simple_pattern, yy_action_717)
 }
 
 ///|
@@ -31815,52 +32533,52 @@ fn yy_state_283(_lookahead : YYSymbol) -> YYDecision {
 
 ///|
 fn yy_state_284(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_simple_pattern, yy_action_704)
+  ReduceNoLookahead(2, NT_simple_pattern, yy_action_716)
 }
 
 ///|
 fn yy_state_285(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_simple_pattern, yy_action_703)
+  ReduceNoLookahead(2, NT_simple_pattern, yy_action_715)
 }
 
 ///|
 fn yy_state_286(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_simple_pattern, yy_action_702)
+  ReduceNoLookahead(2, NT_simple_pattern, yy_action_714)
 }
 
 ///|
 fn yy_state_287(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_simple_pattern, yy_action_701)
+  ReduceNoLookahead(1, NT_simple_pattern, yy_action_713)
 }
 
 ///|
 fn yy_state_288(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_simple_pattern, yy_action_700)
+  ReduceNoLookahead(1, NT_simple_pattern, yy_action_712)
 }
 
 ///|
 fn yy_state_289(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_simple_pattern, yy_action_699)
+  ReduceNoLookahead(1, NT_simple_pattern, yy_action_711)
 }
 
 ///|
 fn yy_state_290(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_simple_pattern, yy_action_698)
+  ReduceNoLookahead(1, NT_simple_pattern, yy_action_710)
 }
 
 ///|
 fn yy_state_291(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_simple_pattern, yy_action_697)
+  ReduceNoLookahead(1, NT_simple_pattern, yy_action_709)
 }
 
 ///|
 fn yy_state_292(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_simple_pattern, yy_action_696)
+  ReduceNoLookahead(1, NT_simple_pattern, yy_action_708)
 }
 
 ///|
 fn yy_state_293(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_simple_pattern, yy_action_695)
+  ReduceNoLookahead(1, NT_simple_pattern, yy_action_707)
 }
 
 ///|
@@ -31895,7 +32613,7 @@ fn yy_state_294(_lookahead : YYSymbol) -> YYDecision {
     | T_ELSE
     | T_IF
     | T_FAT_ARROW
-    | T_AND => Reduce(1, NT_range_pattern, yy_action_694)
+    | T_AND => Reduce(1, NT_range_pattern, yy_action_706)
     _ => Error
   }
 }
@@ -31931,7 +32649,7 @@ fn yy_state_295(_lookahead : YYSymbol) -> YYDecision {
 
 ///|
 fn yy_state_296(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_range_pattern, yy_action_693)
+  ReduceNoLookahead(3, NT_range_pattern, yy_action_705)
 }
 
 ///|
@@ -31952,7 +32670,7 @@ fn yy_state_298(_lookahead : YYSymbol) -> YYDecision {
 
 ///|
 fn yy_state_299(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_constr, yy_action_692)
+  ReduceNoLookahead(3, NT_constr, yy_action_704)
 }
 
 ///|
@@ -31995,7 +32713,7 @@ fn yy_state_301(_lookahead : YYSymbol) -> YYDecision {
 
 ///|
 fn yy_state_302(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_range_pattern, yy_action_691)
+  ReduceNoLookahead(3, NT_range_pattern, yy_action_703)
 }
 
 ///|
@@ -32010,7 +32728,7 @@ fn yy_state_303(_lookahead : YYSymbol) -> YYDecision {
     | T_RBRACE
     | T_AS
     | T_IF
-    | T_FAT_ARROW => Reduce(1, NT_or_pattern, yy_action_690)
+    | T_FAT_ARROW => Reduce(1, NT_or_pattern, yy_action_702)
     _ => Error
   }
 }
@@ -32048,19 +32766,19 @@ fn yy_state_304(_lookahead : YYSymbol) -> YYDecision {
 
 ///|
 fn yy_state_305(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_or_pattern, yy_action_689)
+  ReduceNoLookahead(3, NT_or_pattern, yy_action_701)
 }
 
 ///|
 fn yy_state_306(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_pattern, yy_action_688)
+  ReduceNoLookahead(1, NT_pattern, yy_action_700)
 }
 
 ///|
 fn yy_state_307(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_AS => Shift(yy_state_308)
-    T_RPAREN | T_COMMA => Reduce(1, NT_constr_pat_argument, yy_action_687)
+    T_RPAREN | T_COMMA => Reduce(1, NT_constr_pat_argument, yy_action_699)
     _ => Error
   }
 }
@@ -32075,12 +32793,12 @@ fn yy_state_308(_lookahead : YYSymbol) -> YYDecision {
 
 ///|
 fn yy_state_309(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_pattern, yy_action_686)
+  ReduceNoLookahead(3, NT_pattern, yy_action_698)
 }
 
 ///|
 fn yy_state_310(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_constr_pat_arguments_no_open, yy_action_685)
+  ReduceNoLookahead(2, NT_constr_pat_arguments_no_open, yy_action_697)
 }
 
 ///|
@@ -32093,26 +32811,26 @@ fn yy_state_311(_lookahead : YYSymbol) -> YYDecision {
 
 ///|
 fn yy_state_312(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(4, NT_simple_pattern, yy_action_683)
+  ReduceNoLookahead(4, NT_simple_pattern, yy_action_695)
 }
 
 ///|
 fn yy_state_313(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_AS => Shift(yy_state_308)
-    T_RPAREN | T_COMMA => Reduce(3, NT_constr_pat_argument, yy_action_682)
+    T_RPAREN | T_COMMA => Reduce(3, NT_constr_pat_argument, yy_action_694)
     _ => Error
   }
 }
 
 ///|
 fn yy_state_314(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_constr_pat_arguments, yy_action_681)
+  ReduceNoLookahead(2, NT_constr_pat_arguments, yy_action_693)
 }
 
 ///|
 fn yy_state_315(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_simple_pattern, yy_action_680)
+  ReduceNoLookahead(2, NT_simple_pattern, yy_action_692)
 }
 
 ///|
@@ -32151,7 +32869,7 @@ fn yy_state_318(_lookahead : YYSymbol) -> YYDecision {
 
 ///|
 fn yy_state_319(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(5, NT_simple_pattern, yy_action_679)
+  ReduceNoLookahead(5, NT_simple_pattern, yy_action_691)
 }
 
 ///|
@@ -32193,7 +32911,7 @@ fn yy_state_321(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_COMMA => Shift(yy_state_322)
     NT_option_COMMA_ => Shift(yy_state_324)
-    T_RPAREN => Reduce(0, NT_option_COMMA_, yy_action_865)
+    T_RPAREN => Reduce(0, NT_option_COMMA_, yy_action_877)
     _ => Error
   }
 }
@@ -32226,7 +32944,7 @@ fn yy_state_322(_lookahead : YYSymbol) -> YYDecision {
     NT_range_pattern => Shift(yy_state_303)
     NT_or_pattern => Shift(yy_state_306)
     NT_pattern => Shift(yy_state_323)
-    T_RPAREN => Reduce(1, NT_option_COMMA_, yy_action_863)
+    T_RPAREN => Reduce(1, NT_option_COMMA_, yy_action_875)
     _ => Error
   }
 }
@@ -32236,14 +32954,14 @@ fn yy_state_323(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_AS => Shift(yy_state_308)
     T_RPAREN | T_COMMA =>
-      Reduce(3, NT_non_empty_list_commas_rev_pattern_, yy_action_678)
+      Reduce(3, NT_non_empty_list_commas_rev_pattern_, yy_action_690)
     _ => Error
   }
 }
 
 ///|
 fn yy_state_324(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_non_empty_list_commas_pattern_, yy_action_677)
+  ReduceNoLookahead(2, NT_non_empty_list_commas_pattern_, yy_action_689)
 }
 
 ///|
@@ -32256,7 +32974,7 @@ fn yy_state_325(_lookahead : YYSymbol) -> YYDecision {
 
 ///|
 fn yy_state_326(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(5, NT_simple_pattern, yy_action_676)
+  ReduceNoLookahead(5, NT_simple_pattern, yy_action_688)
 }
 
 ///|
@@ -32264,35 +32982,35 @@ fn yy_state_327(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_AS => Shift(yy_state_308)
     T_RPAREN | T_COMMA =>
-      Reduce(1, NT_non_empty_list_commas_rev_pattern_, yy_action_675)
+      Reduce(1, NT_non_empty_list_commas_rev_pattern_, yy_action_687)
     _ => Error
   }
 }
 
 ///|
 fn yy_state_328(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_simple_pattern, yy_action_674)
+  ReduceNoLookahead(3, NT_simple_pattern, yy_action_686)
 }
 
 ///|
 fn yy_state_329(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_AS => Shift(yy_state_308)
-    T_COMMA | T_RBRACKET => Reduce(1, NT_array_sub_pattern, yy_action_673)
+    T_COMMA | T_RBRACKET => Reduce(1, NT_array_sub_pattern, yy_action_685)
     _ => Error
   }
 }
 
 ///|
 fn yy_state_330(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_array_sub_patterns, yy_action_672)
+  ReduceNoLookahead(3, NT_array_sub_patterns, yy_action_684)
 }
 
 ///|
 fn yy_state_331(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_COMMA => Shift(yy_state_332)
-    T_RBRACKET => Reduce(1, NT_array_sub_patterns, yy_action_671)
+    T_RBRACKET => Reduce(1, NT_array_sub_patterns, yy_action_683)
     _ => Error
   }
 }
@@ -32329,14 +33047,14 @@ fn yy_state_332(_lookahead : YYSymbol) -> YYDecision {
     NT_array_sub_pattern => Shift(yy_state_331)
     NT_array_sub_patterns => Shift(yy_state_333)
     T_DOTDOT => Shift(yy_state_334)
-    T_RBRACKET => Reduce(0, NT_array_sub_patterns, yy_action_725)
+    T_RBRACKET => Reduce(0, NT_array_sub_patterns, yy_action_737)
     _ => Error
   }
 }
 
 ///|
 fn yy_state_333(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_array_sub_patterns, yy_action_670)
+  ReduceNoLookahead(3, NT_array_sub_patterns, yy_action_682)
 }
 
 ///|
@@ -32349,7 +33067,7 @@ fn yy_state_334(_lookahead : YYSymbol) -> YYDecision {
     T_AS => Shift(yy_state_335)
     T_UNDERSCORE => Shift(yy_state_337)
     T_LIDENT => Shift(yy_state_338)
-    T_COMMA | T_RBRACKET => Reduce(1, NT_dotdot_binder, yy_action_669)
+    T_COMMA | T_RBRACKET => Reduce(1, NT_dotdot_binder, yy_action_681)
     _ => Error
   }
 }
@@ -32364,17 +33082,17 @@ fn yy_state_335(_lookahead : YYSymbol) -> YYDecision {
 
 ///|
 fn yy_state_336(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_dotdot_binder, yy_action_668)
+  ReduceNoLookahead(3, NT_dotdot_binder, yy_action_680)
 }
 
 ///|
 fn yy_state_337(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_dotdot_binder, yy_action_667)
+  ReduceNoLookahead(2, NT_dotdot_binder, yy_action_679)
 }
 
 ///|
 fn yy_state_338(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_dotdot_binder, yy_action_666)
+  ReduceNoLookahead(2, NT_dotdot_binder, yy_action_678)
 }
 
 ///|
@@ -32387,7 +33105,7 @@ fn yy_state_339(_lookahead : YYSymbol) -> YYDecision {
 
 ///|
 fn yy_state_340(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_simple_pattern, yy_action_665)
+  ReduceNoLookahead(3, NT_simple_pattern, yy_action_677)
 }
 
 ///|
@@ -32395,14 +33113,14 @@ fn yy_state_341(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_AS => Shift(yy_state_308)
     T_COMMA | T_RBRACE =>
-      Reduce(4, NT_non_empty_list_commas_rev_map_elem_pat_, yy_action_664)
+      Reduce(4, NT_non_empty_list_commas_rev_map_elem_pat_, yy_action_676)
     _ => Error
   }
 }
 
 ///|
 fn yy_state_342(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_option_QUESTION_, yy_action_663)
+  ReduceNoLookahead(1, NT_option_QUESTION_, yy_action_675)
 }
 
 ///|
@@ -32410,7 +33128,7 @@ fn yy_state_343(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(
     1,
     NT_non_empty_list_commas_rev_fields_pat_single_,
-    yy_action_662,
+    yy_action_674,
   )
 }
 
@@ -32419,14 +33137,14 @@ fn yy_state_344(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_option_COMMA_ => Shift(yy_state_345)
     T_COMMA => Shift(yy_state_346)
-    T_RBRACE => Reduce(0, NT_option_COMMA_, yy_action_865)
+    T_RBRACE => Reduce(0, NT_option_COMMA_, yy_action_877)
     _ => Error
   }
 }
 
 ///|
 fn yy_state_345(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_non_empty_list_commas_map_elem_pat_, yy_action_661)
+  ReduceNoLookahead(2, NT_non_empty_list_commas_map_elem_pat_, yy_action_673)
 }
 
 ///|
@@ -32444,9 +33162,9 @@ fn yy_state_346(_lookahead : YYSymbol) -> YYDecision {
     NT_map_syntax_key => Shift(yy_state_347)
     T_MINUS => Shift(yy_state_351)
     NT_simple_constant => Shift(yy_state_355)
-    T_RBRACE => Reduce(1, NT_option_COMMA_, yy_action_863)
+    T_RBRACE => Reduce(1, NT_option_COMMA_, yy_action_875)
     T_DOTDOT =>
-      Reduce(2, NT_non_empty_list_commas_with_tail_map_elem_pat_, yy_action_660)
+      Reduce(2, NT_non_empty_list_commas_with_tail_map_elem_pat_, yy_action_672)
     _ => Error
   }
 }
@@ -32456,7 +33174,7 @@ fn yy_state_347(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_QUESTION => Shift(yy_state_342)
     NT_option_QUESTION_ => Shift(yy_state_348)
-    T_COLON => Reduce(0, NT_option_QUESTION_, yy_action_726)
+    T_COLON => Reduce(0, NT_option_QUESTION_, yy_action_738)
     _ => Error
   }
 }
@@ -32506,7 +33224,7 @@ fn yy_state_350(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_AS => Shift(yy_state_308)
     T_COMMA | T_RBRACE =>
-      Reduce(6, NT_non_empty_list_commas_rev_map_elem_pat_, yy_action_658)
+      Reduce(6, NT_non_empty_list_commas_rev_map_elem_pat_, yy_action_670)
     _ => Error
   }
 }
@@ -32523,22 +33241,22 @@ fn yy_state_351(_lookahead : YYSymbol) -> YYDecision {
 
 ///|
 fn yy_state_352(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_map_syntax_key, yy_action_657)
+  ReduceNoLookahead(2, NT_map_syntax_key, yy_action_669)
 }
 
 ///|
 fn yy_state_353(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_map_syntax_key, yy_action_656)
+  ReduceNoLookahead(2, NT_map_syntax_key, yy_action_668)
 }
 
 ///|
 fn yy_state_354(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_map_syntax_key, yy_action_655)
+  ReduceNoLookahead(2, NT_map_syntax_key, yy_action_667)
 }
 
 ///|
 fn yy_state_355(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_map_syntax_key, yy_action_654)
+  ReduceNoLookahead(1, NT_map_syntax_key, yy_action_666)
 }
 
 ///|
@@ -32546,7 +33264,7 @@ fn yy_state_356(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_option_COMMA_ => Shift(yy_state_357)
     T_COMMA => Shift(yy_state_358)
-    T_RBRACE => Reduce(0, NT_option_COMMA_, yy_action_865)
+    T_RBRACE => Reduce(0, NT_option_COMMA_, yy_action_877)
     _ => Error
   }
 }
@@ -32556,7 +33274,7 @@ fn yy_state_357(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(
     2,
     NT_non_empty_list_commas_fields_pat_single_,
-    yy_action_653,
+    yy_action_665,
   )
 }
 
@@ -32565,12 +33283,12 @@ fn yy_state_358(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_fields_pat_single => Shift(yy_state_359)
     T_LIDENT => Shift(yy_state_360)
-    T_RBRACE => Reduce(1, NT_option_COMMA_, yy_action_863)
+    T_RBRACE => Reduce(1, NT_option_COMMA_, yy_action_875)
     T_DOTDOT =>
       Reduce(
         2,
         NT_non_empty_list_commas_with_tail_fields_pat_single_,
-        yy_action_652,
+        yy_action_664,
       )
     _ => Error
   }
@@ -32581,7 +33299,7 @@ fn yy_state_359(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(
     3,
     NT_non_empty_list_commas_rev_fields_pat_single_,
-    yy_action_651,
+    yy_action_663,
   )
 }
 
@@ -32589,7 +33307,7 @@ fn yy_state_359(_lookahead : YYSymbol) -> YYDecision {
 fn yy_state_360(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_COLON => Shift(yy_state_361)
-    T_COMMA | T_RBRACE => Reduce(1, NT_fields_pat_single, yy_action_649)
+    T_COMMA | T_RBRACE => Reduce(1, NT_fields_pat_single, yy_action_661)
     _ => Error
   }
 }
@@ -32630,7 +33348,7 @@ fn yy_state_361(_lookahead : YYSymbol) -> YYDecision {
 fn yy_state_362(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_AS => Shift(yy_state_308)
-    T_COMMA | T_RBRACE => Reduce(3, NT_fields_pat_single, yy_action_647)
+    T_COMMA | T_RBRACE => Reduce(3, NT_fields_pat_single, yy_action_659)
     _ => Error
   }
 }
@@ -32648,19 +33366,19 @@ fn yy_state_364(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_COMMA => Shift(yy_state_268)
     NT_option_COMMA_ => Shift(yy_state_365)
-    T_RBRACE => Reduce(0, NT_option_COMMA_, yy_action_865)
+    T_RBRACE => Reduce(0, NT_option_COMMA_, yy_action_877)
     _ => Error
   }
 }
 
 ///|
 fn yy_state_365(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_non_empty_map_elems_pat, yy_action_646)
+  ReduceNoLookahead(3, NT_non_empty_map_elems_pat, yy_action_658)
 }
 
 ///|
 fn yy_state_366(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_non_empty_map_elems_pat, yy_action_645)
+  ReduceNoLookahead(1, NT_non_empty_map_elems_pat, yy_action_657)
 }
 
 ///|
@@ -32676,19 +33394,19 @@ fn yy_state_368(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_COMMA => Shift(yy_state_268)
     NT_option_COMMA_ => Shift(yy_state_369)
-    T_RBRACE => Reduce(0, NT_option_COMMA_, yy_action_865)
+    T_RBRACE => Reduce(0, NT_option_COMMA_, yy_action_877)
     _ => Error
   }
 }
 
 ///|
 fn yy_state_369(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_non_empty_fields_pat, yy_action_644)
+  ReduceNoLookahead(3, NT_non_empty_fields_pat, yy_action_656)
 }
 
 ///|
 fn yy_state_370(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_non_empty_fields_pat, yy_action_643)
+  ReduceNoLookahead(1, NT_non_empty_fields_pat, yy_action_655)
 }
 
 ///|
@@ -32701,7 +33419,7 @@ fn yy_state_371(_lookahead : YYSymbol) -> YYDecision {
 
 ///|
 fn yy_state_372(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_simple_pattern, yy_action_642)
+  ReduceNoLookahead(3, NT_simple_pattern, yy_action_654)
 }
 
 ///|
@@ -32714,7 +33432,7 @@ fn yy_state_373(_lookahead : YYSymbol) -> YYDecision {
 
 ///|
 fn yy_state_374(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_simple_pattern, yy_action_641)
+  ReduceNoLookahead(3, NT_simple_pattern, yy_action_653)
 }
 
 ///|
@@ -32722,7 +33440,7 @@ fn yy_state_375(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_COMMA => Shift(yy_state_268)
     NT_option_COMMA_ => Shift(yy_state_376)
-    T_RBRACE => Reduce(0, NT_option_COMMA_, yy_action_865)
+    T_RBRACE => Reduce(0, NT_option_COMMA_, yy_action_877)
     _ => Error
   }
 }
@@ -32737,17 +33455,17 @@ fn yy_state_376(_lookahead : YYSymbol) -> YYDecision {
 
 ///|
 fn yy_state_377(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(4, NT_simple_pattern, yy_action_640)
+  ReduceNoLookahead(4, NT_simple_pattern, yy_action_652)
 }
 
 ///|
 fn yy_state_378(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_simple_pattern, yy_action_639)
+  ReduceNoLookahead(2, NT_simple_pattern, yy_action_651)
 }
 
 ///|
 fn yy_state_379(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_postfix_expr, yy_action_638)
+  ReduceNoLookahead(3, NT_postfix_expr, yy_action_650)
 }
 
 ///|
@@ -32764,12 +33482,12 @@ fn yy_state_380(_lookahead : YYSymbol) -> YYDecision {
 
 ///|
 fn yy_state_381(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_postfix_expr, yy_action_637)
+  ReduceNoLookahead(3, NT_postfix_expr, yy_action_649)
 }
 
 ///|
 fn yy_state_382(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_infix_expr, yy_action_636)
+  ReduceNoLookahead(1, NT_infix_expr, yy_action_648)
 }
 
 ///|
@@ -32796,7 +33514,7 @@ fn yy_state_383(_lookahead : YYSymbol) -> YYDecision {
     | T_LBRACE
     | T_RBRACE
     | T_PIPE
-    | T_AND => Reduce(1, NT_pipe_expr, yy_action_635)
+    | T_AND => Reduce(1, NT_pipe_expr, yy_action_647)
     _ => Error
   }
 }
@@ -32875,7 +33593,7 @@ fn yy_state_385(_lookahead : YYSymbol) -> YYDecision {
     | T_PIPE
     | T_ELSE
     | T_FAT_ARROW
-    | T_AND => Reduce(3, NT_infix_expr, yy_action_633)
+    | T_AND => Reduce(3, NT_infix_expr, yy_action_645)
     _ => Error
   }
 }
@@ -32954,7 +33672,7 @@ fn yy_state_387(_lookahead : YYSymbol) -> YYDecision {
     | T_PIPE
     | T_ELSE
     | T_FAT_ARROW
-    | T_AND => Reduce(3, NT_infix_expr, yy_action_631)
+    | T_AND => Reduce(3, NT_infix_expr, yy_action_643)
     _ => Error
   }
 }
@@ -33033,7 +33751,7 @@ fn yy_state_389(_lookahead : YYSymbol) -> YYDecision {
     | T_PIPE
     | T_ELSE
     | T_FAT_ARROW
-    | T_AND => Reduce(3, NT_infix_expr, yy_action_629)
+    | T_AND => Reduce(3, NT_infix_expr, yy_action_641)
     _ => Error
   }
 }
@@ -33112,7 +33830,7 @@ fn yy_state_391(_lookahead : YYSymbol) -> YYDecision {
     | T_PIPE
     | T_ELSE
     | T_FAT_ARROW
-    | T_AND => Reduce(3, NT_infix_expr, yy_action_627)
+    | T_AND => Reduce(3, NT_infix_expr, yy_action_639)
     _ => Error
   }
 }
@@ -33191,7 +33909,7 @@ fn yy_state_393(_lookahead : YYSymbol) -> YYDecision {
     | T_PIPE
     | T_ELSE
     | T_FAT_ARROW
-    | T_AND => Reduce(3, NT_infix_expr, yy_action_625)
+    | T_AND => Reduce(3, NT_infix_expr, yy_action_637)
     _ => Error
   }
 }
@@ -33270,7 +33988,7 @@ fn yy_state_395(_lookahead : YYSymbol) -> YYDecision {
     | T_PIPE
     | T_ELSE
     | T_FAT_ARROW
-    | T_AND => Reduce(3, NT_infix_expr, yy_action_623)
+    | T_AND => Reduce(3, NT_infix_expr, yy_action_635)
     _ => Error
   }
 }
@@ -33349,7 +34067,7 @@ fn yy_state_397(_lookahead : YYSymbol) -> YYDecision {
     | T_PIPE
     | T_ELSE
     | T_FAT_ARROW
-    | T_AND => Reduce(3, NT_infix_expr, yy_action_621)
+    | T_AND => Reduce(3, NT_infix_expr, yy_action_633)
     _ => Error
   }
 }
@@ -33428,7 +34146,7 @@ fn yy_state_399(_lookahead : YYSymbol) -> YYDecision {
     | T_PIPE
     | T_ELSE
     | T_FAT_ARROW
-    | T_AND => Reduce(3, NT_infix_expr, yy_action_619)
+    | T_AND => Reduce(3, NT_infix_expr, yy_action_631)
     _ => Error
   }
 }
@@ -33507,7 +34225,7 @@ fn yy_state_401(_lookahead : YYSymbol) -> YYDecision {
     | T_PIPE
     | T_ELSE
     | T_FAT_ARROW
-    | T_AND => Reduce(3, NT_infix_expr, yy_action_617)
+    | T_AND => Reduce(3, NT_infix_expr, yy_action_629)
     _ => Error
   }
 }
@@ -33586,7 +34304,7 @@ fn yy_state_403(_lookahead : YYSymbol) -> YYDecision {
     | T_PIPE
     | T_ELSE
     | T_FAT_ARROW
-    | T_AND => Reduce(3, NT_infix_expr, yy_action_615)
+    | T_AND => Reduce(3, NT_infix_expr, yy_action_627)
     _ => Error
   }
 }
@@ -33640,7 +34358,7 @@ fn yy_state_404(_lookahead : YYSymbol) -> YYDecision {
 
 ///|
 fn yy_state_405(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_infix_expr, yy_action_613)
+  ReduceNoLookahead(3, NT_infix_expr, yy_action_625)
 }
 
 ///|
@@ -33683,7 +34401,7 @@ fn yy_state_406(_lookahead : YYSymbol) -> YYDecision {
     | T_RANGE_EXCLUSIVE_REV
     | T_IS
     | T_AND
-    | T_LEXMATCH_QUESTION => Reduce(1, NT_simple_expr, yy_action_775)
+    | T_LEXMATCH_QUESTION => Reduce(1, NT_simple_expr, yy_action_787)
     _ => Error
   }
 }
@@ -33743,29 +34461,29 @@ fn yy_state_407(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    T_POST_LABEL => Shift(yy_state_528)
-    NT_expr => Shift(yy_state_533)
-    NT_left_value => Shift(yy_state_534)
-    T_ELLIPSIS => Shift(yy_state_539)
-    T_RAISE => Shift(yy_state_540)
-    T_PACKAGE_NAME => Shift(yy_state_542)
-    T_LIDENT => Shift(yy_state_544)
-    NT_expr_statement_no_break_continue_return => Shift(yy_state_674)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_POST_LABEL => Shift(yy_state_530)
+    NT_expr => Shift(yy_state_535)
+    NT_left_value => Shift(yy_state_536)
+    T_ELLIPSIS => Shift(yy_state_541)
+    T_RAISE => Shift(yy_state_542)
+    T_PACKAGE_NAME => Shift(yy_state_544)
+    T_LIDENT => Shift(yy_state_546)
+    NT_expr_statement_no_break_continue_return => Shift(yy_state_682)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
     _ => Error
   }
 }
 
 ///|
 fn yy_state_408(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_left_value, yy_action_611)
+  ReduceNoLookahead(1, NT_left_value, yy_action_623)
 }
 
 ///|
@@ -33773,11 +34491,11 @@ fn yy_state_409(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_DOTDOT => Shift(yy_state_158)
     T_QUESTION => Shift(yy_state_410)
-    T_EXCLAMATION => Shift(yy_state_647)
-    T_LPAREN => Shift(yy_state_651)
-    T_LBRACKET => Shift(yy_state_654)
-    T_DOT_INT => Shift(yy_state_661)
-    T_DOT_LIDENT => Shift(yy_state_662)
+    T_EXCLAMATION => Shift(yy_state_655)
+    T_LPAREN => Shift(yy_state_659)
+    T_LBRACKET => Shift(yy_state_662)
+    T_DOT_INT => Shift(yy_state_669)
+    T_DOT_LIDENT => Shift(yy_state_670)
     T_INFIX1
     | T_INFIX2
     | T_INFIX3
@@ -33807,7 +34525,7 @@ fn yy_state_409(_lookahead : YYSymbol) -> YYDecision {
     | T_RANGE_EXCLUSIVE_REV
     | T_IS
     | T_AND
-    | T_LEXMATCH_QUESTION => Reduce(1, NT_prefix_expr, yy_action_782)
+    | T_LEXMATCH_QUESTION => Reduce(1, NT_prefix_expr, yy_action_794)
     _ => Error
   }
 }
@@ -33880,17 +34598,17 @@ fn yy_state_411(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    T_POST_LABEL => Shift(yy_state_639)
-    T_LIDENT => Shift(yy_state_642)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
-    T_RPAREN => Reduce(0, NT_list_commas_argument_, yy_action_780)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_POST_LABEL => Shift(yy_state_647)
+    T_LIDENT => Shift(yy_state_650)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
+    T_RPAREN => Reduce(0, NT_list_commas_argument_, yy_action_792)
     _ => Error
   }
 }
@@ -33905,7 +34623,7 @@ fn yy_state_412(_lookahead : YYSymbol) -> YYDecision {
 
 ///|
 fn yy_state_413(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(5, NT_simple_expr, yy_action_610)
+  ReduceNoLookahead(5, NT_simple_expr, yy_action_622)
 }
 
 ///|
@@ -33967,18 +34685,18 @@ fn yy_state_414(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    T_POST_LABEL => Shift(yy_state_528)
-    T_RPAREN => Shift(yy_state_629)
-    NT_arrow_fn_prefix => Shift(yy_state_632)
-    T_LIDENT => Shift(yy_state_635)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_POST_LABEL => Shift(yy_state_530)
+    T_RPAREN => Shift(yy_state_637)
+    NT_arrow_fn_prefix => Shift(yy_state_640)
+    T_LIDENT => Shift(yy_state_643)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
     _ => Error
   }
 }
@@ -34017,7 +34735,7 @@ fn yy_state_415(_lookahead : YYSymbol) -> YYDecision {
     | T_RANGE_INCLUSIVE_REV
     | T_RANGE_EXCLUSIVE_REV
     | T_IS
-    | T_LEXMATCH_QUESTION => Reduce(1, NT_simple_expr, yy_action_775)
+    | T_LEXMATCH_QUESTION => Reduce(1, NT_simple_expr, yy_action_787)
     _ => Error
   }
 }
@@ -34059,12 +34777,12 @@ fn yy_state_418(_lookahead : YYSymbol) -> YYDecision {
 
 ///|
 fn yy_state_419(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(5, NT_arrow_fn_prefix, yy_action_609)
+  ReduceNoLookahead(5, NT_arrow_fn_prefix, yy_action_621)
 }
 
 ///|
 fn yy_state_420(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(5, NT_arrow_fn_prefix, yy_action_608)
+  ReduceNoLookahead(5, NT_arrow_fn_prefix, yy_action_620)
 }
 
 ///|
@@ -34103,7 +34821,7 @@ fn yy_state_423(_lookahead : YYSymbol) -> YYDecision {
 
 ///|
 fn yy_state_424(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(4, NT_arrow_fn_prefix, yy_action_607)
+  ReduceNoLookahead(4, NT_arrow_fn_prefix, yy_action_619)
 }
 
 ///|
@@ -34119,12 +34837,12 @@ fn yy_state_425(_lookahead : YYSymbol) -> YYDecision {
 
 ///|
 fn yy_state_426(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_arrow_fn_prefix, yy_action_606)
+  ReduceNoLookahead(3, NT_arrow_fn_prefix, yy_action_618)
 }
 
 ///|
 fn yy_state_427(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_arrow_fn_prefix, yy_action_605)
+  ReduceNoLookahead(3, NT_arrow_fn_prefix, yy_action_617)
 }
 
 ///|
@@ -34174,17 +34892,17 @@ fn yy_state_431(_lookahead : YYSymbol) -> YYDecision {
 
 ///|
 fn yy_state_432(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(5, NT_arrow_fn_prefix, yy_action_604)
+  ReduceNoLookahead(5, NT_arrow_fn_prefix, yy_action_616)
 }
 
 ///|
 fn yy_state_433(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(5, NT_arrow_fn_prefix, yy_action_603)
+  ReduceNoLookahead(5, NT_arrow_fn_prefix, yy_action_615)
 }
 
 ///|
 fn yy_state_434(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(4, NT_arrow_fn_prefix, yy_action_602)
+  ReduceNoLookahead(4, NT_arrow_fn_prefix, yy_action_614)
 }
 
 ///|
@@ -34200,28 +34918,28 @@ fn yy_state_435(_lookahead : YYSymbol) -> YYDecision {
 
 ///|
 fn yy_state_436(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_arrow_fn_prefix, yy_action_601)
+  ReduceNoLookahead(3, NT_arrow_fn_prefix, yy_action_613)
 }
 
 ///|
 fn yy_state_437(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_arrow_fn_prefix, yy_action_600)
+  ReduceNoLookahead(3, NT_arrow_fn_prefix, yy_action_612)
 }
 
 ///|
 fn yy_state_438(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_arrow_fn_prefix, yy_action_599)
+  ReduceNoLookahead(2, NT_arrow_fn_prefix, yy_action_611)
 }
 
 ///|
 fn yy_state_439(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_arrow_fn_prefix, yy_action_598)
+  ReduceNoLookahead(2, NT_arrow_fn_prefix, yy_action_610)
 }
 
 ///|
 fn yy_state_440(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_FAT_ARROW => Reduce(4, NT_arrow_fn_prefix, yy_action_607)
+    T_FAT_ARROW => Reduce(4, NT_arrow_fn_prefix, yy_action_619)
     T_INFIX1
     | T_INFIX2
     | T_INFIX3
@@ -34258,7 +34976,7 @@ fn yy_state_440(_lookahead : YYSymbol) -> YYDecision {
     | T_RANGE_EXCLUSIVE_REV
     | T_IS
     | T_AND
-    | T_LEXMATCH_QUESTION => Reduce(5, NT_tuple_expr, yy_action_597)
+    | T_LEXMATCH_QUESTION => Reduce(5, NT_tuple_expr, yy_action_609)
     _ => Error
   }
 }
@@ -34324,34 +35042,34 @@ fn yy_state_441(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    T_POST_LABEL => Shift(yy_state_528)
-    T_LIDENT => Shift(yy_state_623)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_POST_LABEL => Shift(yy_state_530)
+    T_LIDENT => Shift(yy_state_631)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
     _ => Error
   }
 }
 
 ///|
 fn yy_state_442(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_non_empty_tuple_elems_with_prefix, yy_action_596)
+  ReduceNoLookahead(3, NT_non_empty_tuple_elems_with_prefix, yy_action_608)
 }
 
 ///|
 fn yy_state_443(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_arrow_fn_prefix_no_constraint, yy_action_595)
+  ReduceNoLookahead(3, NT_arrow_fn_prefix_no_constraint, yy_action_607)
 }
 
 ///|
 fn yy_state_444(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_FAT_ARROW => Reduce(3, NT_arrow_fn_prefix, yy_action_605)
+    T_FAT_ARROW => Reduce(3, NT_arrow_fn_prefix, yy_action_617)
     T_INFIX1
     | T_INFIX2
     | T_INFIX3
@@ -34389,7 +35107,7 @@ fn yy_state_444(_lookahead : YYSymbol) -> YYDecision {
     | T_IS
     | T_AND
     | T_LEXMATCH_QUESTION =>
-      Reduce(3, NT_arrow_fn_prefix_no_constraint, yy_action_594)
+      Reduce(3, NT_arrow_fn_prefix_no_constraint, yy_action_606)
     _ => Error
   }
 }
@@ -34428,7 +35146,7 @@ fn yy_state_445(_lookahead : YYSymbol) -> YYDecision {
     | T_RANGE_INCLUSIVE_REV
     | T_RANGE_EXCLUSIVE_REV
     | T_IS
-    | T_LEXMATCH_QUESTION => Reduce(1, NT_simple_expr, yy_action_775)
+    | T_LEXMATCH_QUESTION => Reduce(1, NT_simple_expr, yy_action_787)
     _ => Error
   }
 }
@@ -34436,7 +35154,7 @@ fn yy_state_445(_lookahead : YYSymbol) -> YYDecision {
 ///|
 fn yy_state_446(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_FAT_ARROW => Reduce(2, NT_arrow_fn_prefix, yy_action_598)
+    T_FAT_ARROW => Reduce(2, NT_arrow_fn_prefix, yy_action_610)
     T_INFIX1
     | T_INFIX2
     | T_INFIX3
@@ -34474,7 +35192,7 @@ fn yy_state_446(_lookahead : YYSymbol) -> YYDecision {
     | T_IS
     | T_AND
     | T_LEXMATCH_QUESTION =>
-      Reduce(2, NT_arrow_fn_prefix_no_constraint, yy_action_593)
+      Reduce(2, NT_arrow_fn_prefix_no_constraint, yy_action_605)
     _ => Error
   }
 }
@@ -34484,7 +35202,7 @@ fn yy_state_447(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_PIPE => Shift(yy_state_448)
     NT_catch_keyword => Shift(yy_state_453)
-    T_CATCH => Shift(yy_state_516)
+    T_CATCH => Shift(yy_state_518)
     T_EOF
     | T_RPAREN
     | T_COMMA
@@ -34493,7 +35211,7 @@ fn yy_state_447(_lookahead : YYSymbol) -> YYDecision {
     | T_RBRACKET
     | T_LBRACE
     | T_RBRACE
-    | T_AND => Reduce(1, NT_simple_try_expr, yy_action_592)
+    | T_AND => Reduce(1, NT_simple_try_expr, yy_action_604)
     _ => Error
   }
 }
@@ -34569,7 +35287,7 @@ fn yy_state_449(_lookahead : YYSymbol) -> YYDecision {
     | T_LBRACE
     | T_RBRACE
     | T_PIPE
-    | T_AND => Reduce(3, NT_pipe_expr, yy_action_591)
+    | T_AND => Reduce(3, NT_pipe_expr, yy_action_603)
     _ => Error
   }
 }
@@ -34614,7 +35332,7 @@ fn yy_state_450(_lookahead : YYSymbol) -> YYDecision {
     | T_RANGE_EXCLUSIVE_REV
     | T_IS
     | T_AND
-    | T_LEXMATCH_QUESTION => Reduce(1, NT_qual_ident_simple_expr, yy_action_757)
+    | T_LEXMATCH_QUESTION => Reduce(1, NT_qual_ident_simple_expr, yy_action_769)
     _ => Error
   }
 }
@@ -34630,7 +35348,7 @@ fn yy_state_451(_lookahead : YYSymbol) -> YYDecision {
 
 ///|
 fn yy_state_452(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(5, NT_pipe_expr, yy_action_590)
+  ReduceNoLookahead(5, NT_pipe_expr, yy_action_602)
 }
 
 ///|
@@ -34663,10 +35381,10 @@ fn yy_state_453(_lookahead : YYSymbol) -> YYDecision {
     NT_single_pattern_case => Shift(yy_state_454)
     T_ELLIPSIS => Shift(yy_state_457)
     NT_pattern => Shift(yy_state_458)
-    NT_non_empty_list_semis_single_pattern_case_ => Shift(yy_state_508)
-    NT_list_semis_single_pattern_case_ => Shift(yy_state_515)
-    NT_single_pattern_cases => Shift(yy_state_621)
-    T_RBRACE => Reduce(0, NT_list_semis_single_pattern_case_, yy_action_589)
+    NT_non_empty_list_semis_single_pattern_case_ => Shift(yy_state_510)
+    NT_list_semis_single_pattern_case_ => Shift(yy_state_517)
+    NT_single_pattern_cases => Shift(yy_state_625)
+    T_RBRACE => Reduce(0, NT_list_semis_single_pattern_case_, yy_action_601)
     _ => Error
   }
 }
@@ -34675,8 +35393,8 @@ fn yy_state_453(_lookahead : YYSymbol) -> YYDecision {
 fn yy_state_454(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_SEMI => Shift(yy_state_455)
-    NT_option_SEMI_ => Shift(yy_state_620)
-    T_RBRACE => Reduce(0, NT_option_SEMI_, yy_action_800)
+    NT_option_SEMI_ => Shift(yy_state_624)
+    T_RBRACE => Reduce(0, NT_option_SEMI_, yy_action_812)
     _ => Error
   }
 }
@@ -34712,7 +35430,7 @@ fn yy_state_455(_lookahead : YYSymbol) -> YYDecision {
     NT_non_empty_list_semis_single_pattern_case_ => Shift(yy_state_456)
     T_ELLIPSIS => Shift(yy_state_457)
     NT_pattern => Shift(yy_state_458)
-    T_RBRACE => Reduce(1, NT_option_SEMI_, yy_action_798)
+    T_RBRACE => Reduce(1, NT_option_SEMI_, yy_action_810)
     _ => Error
   }
 }
@@ -34722,13 +35440,13 @@ fn yy_state_456(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(
     3,
     NT_non_empty_list_semis_single_pattern_case_,
-    yy_action_588,
+    yy_action_600,
   )
 }
 
 ///|
 fn yy_state_457(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_single_pattern_case, yy_action_587)
+  ReduceNoLookahead(1, NT_single_pattern_case, yy_action_599)
 }
 
 ///|
@@ -34737,7 +35455,7 @@ fn yy_state_458(_lookahead : YYSymbol) -> YYDecision {
     T_AS => Shift(yy_state_308)
     T_IF => Shift(yy_state_459)
     NT_option_preceded_IF_infix_expr__ => Shift(yy_state_461)
-    T_FAT_ARROW => Reduce(0, NT_option_preceded_IF_infix_expr__, yy_action_586)
+    T_FAT_ARROW => Reduce(0, NT_option_preceded_IF_infix_expr__, yy_action_598)
     _ => Error
   }
 }
@@ -34803,7 +35521,7 @@ fn yy_state_460(_lookahead : YYSymbol) -> YYDecision {
     T_INFIX2 => Shift(yy_state_400)
     T_INFIX3 => Shift(yy_state_402)
     T_INFIX4 => Shift(yy_state_404)
-    T_FAT_ARROW => Reduce(2, NT_option_preceded_IF_infix_expr__, yy_action_584)
+    T_FAT_ARROW => Reduce(2, NT_option_preceded_IF_infix_expr__, yy_action_596)
     _ => Error
   }
 }
@@ -34871,78 +35589,78 @@ fn yy_state_462(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    T_POST_LABEL => Shift(yy_state_528)
-    NT_expr => Shift(yy_state_533)
-    NT_left_value => Shift(yy_state_534)
-    T_ELLIPSIS => Shift(yy_state_539)
-    T_RAISE => Shift(yy_state_540)
-    T_PACKAGE_NAME => Shift(yy_state_542)
-    T_LIDENT => Shift(yy_state_544)
-    NT_expr_statement_no_break_continue_return => Shift(yy_state_599)
-    T_RETURN => Shift(yy_state_600)
-    T_CONTINUE => Shift(yy_state_603)
-    T_BREAK => Shift(yy_state_612)
-    NT_expr_statement => Shift(yy_state_619)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_POST_LABEL => Shift(yy_state_530)
+    NT_expr => Shift(yy_state_535)
+    NT_left_value => Shift(yy_state_536)
+    T_ELLIPSIS => Shift(yy_state_541)
+    T_RAISE => Shift(yy_state_542)
+    T_PACKAGE_NAME => Shift(yy_state_544)
+    T_LIDENT => Shift(yy_state_546)
+    NT_expr_statement_no_break_continue_return => Shift(yy_state_601)
+    T_RETURN => Shift(yy_state_602)
+    T_CONTINUE => Shift(yy_state_605)
+    T_BREAK => Shift(yy_state_614)
+    NT_expr_statement => Shift(yy_state_623)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
     _ => Error
   }
 }
 
 ///|
 fn yy_state_463(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_expr, yy_action_583)
+  ReduceNoLookahead(1, NT_expr, yy_action_595)
 }
 
 ///|
 fn yy_state_464(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_expr, yy_action_582)
+  ReduceNoLookahead(1, NT_expr, yy_action_594)
 }
 
 ///|
 fn yy_state_465(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_expr, yy_action_581)
+  ReduceNoLookahead(1, NT_expr, yy_action_593)
 }
 
 ///|
 fn yy_state_466(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_expr, yy_action_580)
+  ReduceNoLookahead(1, NT_expr, yy_action_592)
 }
 
 ///|
 fn yy_state_467(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_expr, yy_action_579)
+  ReduceNoLookahead(1, NT_expr, yy_action_591)
 }
 
 ///|
 fn yy_state_468(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_expr, yy_action_578)
+  ReduceNoLookahead(1, NT_expr, yy_action_590)
 }
 
 ///|
 fn yy_state_469(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_expr, yy_action_577)
+  ReduceNoLookahead(1, NT_expr, yy_action_589)
 }
 
 ///|
 fn yy_state_470(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_expr, yy_action_576)
+  ReduceNoLookahead(1, NT_expr, yy_action_588)
 }
 
 ///|
 fn yy_state_471(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_expr, yy_action_575)
+  ReduceNoLookahead(1, NT_expr, yy_action_587)
 }
 
 ///|
 fn yy_state_472(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_expr, yy_action_574)
+  ReduceNoLookahead(1, NT_expr, yy_action_586)
 }
 
 ///|
@@ -35030,12 +35748,12 @@ fn yy_state_476(_lookahead : YYSymbol) -> YYDecision {
 
 ///|
 fn yy_state_477(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(5, NT_lexmatch_header, yy_action_573)
+  ReduceNoLookahead(5, NT_lexmatch_header, yy_action_585)
 }
 
 ///|
 fn yy_state_478(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_lexmatch_header, yy_action_572)
+  ReduceNoLookahead(3, NT_lexmatch_header, yy_action_584)
 }
 
 ///|
@@ -35052,9 +35770,9 @@ fn yy_state_479(_lookahead : YYSymbol) -> YYDecision {
     NT_lex_case => Shift(yy_state_480)
     T_ELLIPSIS => Shift(yy_state_484)
     NT_lex_pattern => Shift(yy_state_485)
-    NT_non_empty_list_semis_lex_case_ => Shift(yy_state_616)
-    NT_list_semis_lex_case_ => Shift(yy_state_617)
-    T_RBRACE => Reduce(0, NT_list_semis_lex_case_, yy_action_571)
+    NT_non_empty_list_semis_lex_case_ => Shift(yy_state_620)
+    NT_list_semis_lex_case_ => Shift(yy_state_621)
+    T_RBRACE => Reduce(0, NT_list_semis_lex_case_, yy_action_583)
     _ => Error
   }
 }
@@ -35064,14 +35782,14 @@ fn yy_state_480(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_option_SEMI_ => Shift(yy_state_481)
     T_SEMI => Shift(yy_state_482)
-    T_RBRACE => Reduce(0, NT_option_SEMI_, yy_action_800)
+    T_RBRACE => Reduce(0, NT_option_SEMI_, yy_action_812)
     _ => Error
   }
 }
 
 ///|
 fn yy_state_481(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_non_empty_list_semis_lex_case_, yy_action_570)
+  ReduceNoLookahead(2, NT_non_empty_list_semis_lex_case_, yy_action_582)
 }
 
 ///|
@@ -35089,31 +35807,98 @@ fn yy_state_482(_lookahead : YYSymbol) -> YYDecision {
     NT_non_empty_list_semis_lex_case_ => Shift(yy_state_483)
     T_ELLIPSIS => Shift(yy_state_484)
     NT_lex_pattern => Shift(yy_state_485)
-    T_RBRACE => Reduce(1, NT_option_SEMI_, yy_action_798)
+    T_RBRACE => Reduce(1, NT_option_SEMI_, yy_action_810)
     _ => Error
   }
 }
 
 ///|
 fn yy_state_483(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_non_empty_list_semis_lex_case_, yy_action_569)
+  ReduceNoLookahead(3, NT_non_empty_list_semis_lex_case_, yy_action_581)
 }
 
 ///|
 fn yy_state_484(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_lex_case, yy_action_568)
+  ReduceNoLookahead(1, NT_lex_case, yy_action_580)
 }
 
 ///|
 fn yy_state_485(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_FAT_ARROW => Shift(yy_state_486)
+    T_IF => Shift(yy_state_486)
+    T_FAT_ARROW => Shift(yy_state_618)
     _ => Error
   }
 }
 
 ///|
 fn yy_state_486(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    NT_multiline_string => Shift(yy_state_2)
+    T_MULTILINE_INTERP => Shift(yy_state_4)
+    T_MULTILINE_STRING => Shift(yy_state_5)
+    T_STRING => Shift(yy_state_6)
+    T_FLOAT => Shift(yy_state_7)
+    T_DOUBLE => Shift(yy_state_8)
+    T_INT => Shift(yy_state_9)
+    T_CHAR => Shift(yy_state_10)
+    T_BYTES => Shift(yy_state_11)
+    T_BYTE => Shift(yy_state_12)
+    T_FALSE => Shift(yy_state_13)
+    T_TRUE => Shift(yy_state_14)
+    T_INTERP => Shift(yy_state_15)
+    NT_non_empty_list_multiline_string_ => Shift(yy_state_16)
+    NT_simple_constant => Shift(yy_state_17)
+    T_AMPER => Shift(yy_state_18)
+    NT_qual_ident_ty => Shift(yy_state_24)
+    NT_tuple_expr => Shift(yy_state_25)
+    T_LBRACKET => Shift(yy_state_26)
+    NT_constr => Shift(yy_state_34)
+    NT_qual_ident_simple_expr => Shift(yy_state_35)
+    NT_atomic_expr => Shift(yy_state_36)
+    NT_anony_fn => Shift(yy_state_37)
+    T_LBRACE => Shift(yy_state_38)
+    T_FN => Shift(yy_state_47)
+    NT_type_name => Shift(yy_state_130)
+    T_ASYNC => Shift(yy_state_142)
+    NT_simple_expr => Shift(yy_state_156)
+    T_EXCLAMATION => Shift(yy_state_168)
+    T_UNDERSCORE => Shift(yy_state_169)
+    T_LPAREN => Shift(yy_state_170)
+    T_MINUS => Shift(yy_state_184)
+    T_PLUS => Shift(yy_state_186)
+    T_UIDENT => Shift(yy_state_188)
+    T_PACKAGE_NAME => Shift(yy_state_189)
+    T_LIDENT => Shift(yy_state_192)
+    NT_prefix_expr => Shift(yy_state_198)
+    NT_range_expr => Shift(yy_state_209)
+    NT_postfix_expr => Shift(yy_state_382)
+    NT_infix_expr => Shift(yy_state_487)
+    _ => Error
+  }
+}
+
+///|
+fn yy_state_487(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_BARBAR => Shift(yy_state_384)
+    T_AMPERAMPER => Shift(yy_state_386)
+    T_BAR => Shift(yy_state_388)
+    T_CARET => Shift(yy_state_390)
+    T_AMPER => Shift(yy_state_392)
+    T_MINUS => Shift(yy_state_394)
+    T_PLUS => Shift(yy_state_396)
+    T_INFIX1 => Shift(yy_state_398)
+    T_INFIX2 => Shift(yy_state_400)
+    T_INFIX3 => Shift(yy_state_402)
+    T_INFIX4 => Shift(yy_state_404)
+    T_FAT_ARROW => Shift(yy_state_488)
+    _ => Error
+  }
+}
+
+///|
+fn yy_state_488(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_multiline_string => Shift(yy_state_2)
     T_MULTILINE_INTERP => Shift(yy_state_4)
@@ -35167,37 +35952,37 @@ fn yy_state_486(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_expr_statement => Shift(yy_state_487)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    T_POST_LABEL => Shift(yy_state_528)
-    NT_expr => Shift(yy_state_533)
-    NT_left_value => Shift(yy_state_534)
-    T_ELLIPSIS => Shift(yy_state_539)
-    T_RAISE => Shift(yy_state_540)
-    T_PACKAGE_NAME => Shift(yy_state_542)
-    T_LIDENT => Shift(yy_state_544)
-    NT_expr_statement_no_break_continue_return => Shift(yy_state_599)
-    T_RETURN => Shift(yy_state_600)
-    T_CONTINUE => Shift(yy_state_603)
-    T_BREAK => Shift(yy_state_612)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
+    NT_expr_statement => Shift(yy_state_489)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_POST_LABEL => Shift(yy_state_530)
+    NT_expr => Shift(yy_state_535)
+    NT_left_value => Shift(yy_state_536)
+    T_ELLIPSIS => Shift(yy_state_541)
+    T_RAISE => Shift(yy_state_542)
+    T_PACKAGE_NAME => Shift(yy_state_544)
+    T_LIDENT => Shift(yy_state_546)
+    NT_expr_statement_no_break_continue_return => Shift(yy_state_601)
+    T_RETURN => Shift(yy_state_602)
+    T_CONTINUE => Shift(yy_state_605)
+    T_BREAK => Shift(yy_state_614)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_487(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_lex_case, yy_action_567)
+fn yy_state_489(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(5, NT_lex_case, yy_action_579)
 }
 
 ///|
-fn yy_state_488(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_490(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_AMPER => Shift(yy_state_18)
     NT_qual_ident_ty => Shift(yy_state_24)
@@ -35226,32 +36011,32 @@ fn yy_state_488(_lookahead : YYSymbol) -> YYDecision {
     NT_single_pattern_case => Shift(yy_state_454)
     T_ELLIPSIS => Shift(yy_state_457)
     NT_pattern => Shift(yy_state_458)
-    T_RBRACE => Shift(yy_state_489)
-    NT_non_empty_list_semis_single_pattern_case_ => Shift(yy_state_490)
+    T_RBRACE => Shift(yy_state_491)
+    NT_non_empty_list_semis_single_pattern_case_ => Shift(yy_state_492)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_489(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_match_expr, yy_action_566)
+fn yy_state_491(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(2, NT_match_expr, yy_action_578)
 }
 
 ///|
-fn yy_state_490(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_492(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RBRACE => Shift(yy_state_491)
+    T_RBRACE => Shift(yy_state_493)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_491(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_match_expr, yy_action_565)
+fn yy_state_493(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(3, NT_match_expr, yy_action_577)
 }
 
 ///|
-fn yy_state_492(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_494(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_multiline_string => Shift(yy_state_2)
     T_MULTILINE_INTERP => Shift(yy_state_4)
@@ -35292,13 +36077,13 @@ fn yy_state_492(_lookahead : YYSymbol) -> YYDecision {
     NT_prefix_expr => Shift(yy_state_198)
     NT_range_expr => Shift(yy_state_209)
     NT_postfix_expr => Shift(yy_state_382)
-    NT_infix_expr => Shift(yy_state_493)
+    NT_infix_expr => Shift(yy_state_495)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_493(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_495(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_BARBAR => Shift(yy_state_384)
     T_AMPERAMPER => Shift(yy_state_386)
@@ -35311,18 +36096,18 @@ fn yy_state_493(_lookahead : YYSymbol) -> YYDecision {
     T_INFIX2 => Shift(yy_state_400)
     T_INFIX3 => Shift(yy_state_402)
     T_INFIX4 => Shift(yy_state_404)
-    T_LBRACE => Shift(yy_state_494)
+    T_LBRACE => Shift(yy_state_496)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_494(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_match_header, yy_action_564)
+fn yy_state_496(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(3, NT_match_header, yy_action_576)
 }
 
 ///|
-fn yy_state_495(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_497(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_multiline_string => Shift(yy_state_2)
     T_MULTILINE_INTERP => Shift(yy_state_4)
@@ -35363,13 +36148,13 @@ fn yy_state_495(_lookahead : YYSymbol) -> YYDecision {
     NT_prefix_expr => Shift(yy_state_198)
     NT_range_expr => Shift(yy_state_209)
     NT_postfix_expr => Shift(yy_state_382)
-    NT_infix_expr => Shift(yy_state_496)
+    NT_infix_expr => Shift(yy_state_498)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_496(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_498(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LBRACE => Shift(yy_state_124)
     T_BARBAR => Shift(yy_state_384)
@@ -35383,15 +36168,15 @@ fn yy_state_496(_lookahead : YYSymbol) -> YYDecision {
     T_INFIX2 => Shift(yy_state_400)
     T_INFIX3 => Shift(yy_state_402)
     T_INFIX4 => Shift(yy_state_404)
-    NT_block_expr => Shift(yy_state_497)
+    NT_block_expr => Shift(yy_state_499)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_497(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_499(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_ELSE => Shift(yy_state_498)
+    T_ELSE => Shift(yy_state_500)
     T_EOF
     | T_RPAREN
     | T_COMMA
@@ -35400,34 +36185,34 @@ fn yy_state_497(_lookahead : YYSymbol) -> YYDecision {
     | T_RBRACKET
     | T_LBRACE
     | T_RBRACE
-    | T_AND => Reduce(3, NT_if_expr, yy_action_563)
+    | T_AND => Reduce(3, NT_if_expr, yy_action_575)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_498(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_500(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LBRACE => Shift(yy_state_124)
-    T_IF => Shift(yy_state_495)
-    NT_if_expr => Shift(yy_state_499)
-    NT_block_expr => Shift(yy_state_500)
+    T_IF => Shift(yy_state_497)
+    NT_if_expr => Shift(yy_state_501)
+    NT_block_expr => Shift(yy_state_502)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_499(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(5, NT_if_expr, yy_action_562)
+fn yy_state_501(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(5, NT_if_expr, yy_action_574)
 }
 
 ///|
-fn yy_state_500(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(5, NT_if_expr, yy_action_561)
+fn yy_state_502(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(5, NT_if_expr, yy_action_573)
 }
 
 ///|
-fn yy_state_501(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_503(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_multiline_string => Shift(yy_state_2)
     T_MULTILINE_INTERP => Shift(yy_state_4)
@@ -35469,13 +36254,13 @@ fn yy_state_501(_lookahead : YYSymbol) -> YYDecision {
     NT_range_expr => Shift(yy_state_209)
     NT_postfix_expr => Shift(yy_state_382)
     NT_infix_expr => Shift(yy_state_383)
-    NT_pipe_expr => Shift(yy_state_502)
+    NT_pipe_expr => Shift(yy_state_504)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_502(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_504(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_PIPE => Shift(yy_state_448)
     T_EOF
@@ -35486,13 +36271,13 @@ fn yy_state_502(_lookahead : YYSymbol) -> YYDecision {
     | T_RBRACKET
     | T_LBRACE
     | T_RBRACE
-    | T_AND => Reduce(2, NT_try_expr, yy_action_560)
+    | T_AND => Reduce(2, NT_try_expr, yy_action_572)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_503(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_505(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_multiline_string => Shift(yy_state_2)
     T_MULTILINE_INTERP => Shift(yy_state_4)
@@ -35534,13 +36319,13 @@ fn yy_state_503(_lookahead : YYSymbol) -> YYDecision {
     NT_range_expr => Shift(yy_state_209)
     NT_postfix_expr => Shift(yy_state_382)
     NT_infix_expr => Shift(yy_state_383)
-    NT_pipe_expr => Shift(yy_state_504)
+    NT_pipe_expr => Shift(yy_state_506)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_504(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_506(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_PIPE => Shift(yy_state_448)
     T_EOF
@@ -35551,13 +36336,13 @@ fn yy_state_504(_lookahead : YYSymbol) -> YYDecision {
     | T_RBRACKET
     | T_LBRACE
     | T_RBRACE
-    | T_AND => Reduce(2, NT_try_expr, yy_action_559)
+    | T_AND => Reduce(2, NT_try_expr, yy_action_571)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_505(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_507(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_multiline_string => Shift(yy_state_2)
     T_MULTILINE_INTERP => Shift(yy_state_4)
@@ -35599,23 +36384,23 @@ fn yy_state_505(_lookahead : YYSymbol) -> YYDecision {
     NT_range_expr => Shift(yy_state_209)
     NT_postfix_expr => Shift(yy_state_382)
     NT_infix_expr => Shift(yy_state_383)
-    NT_pipe_expr => Shift(yy_state_506)
+    NT_pipe_expr => Shift(yy_state_508)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_506(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_508(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_PIPE => Shift(yy_state_448)
-    NT_catch_keyword => Shift(yy_state_507)
-    T_CATCH => Shift(yy_state_516)
+    NT_catch_keyword => Shift(yy_state_509)
+    T_CATCH => Shift(yy_state_518)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_507(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_509(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_AMPER => Shift(yy_state_18)
     NT_qual_ident_ty => Shift(yy_state_24)
@@ -35644,31 +36429,31 @@ fn yy_state_507(_lookahead : YYSymbol) -> YYDecision {
     NT_single_pattern_case => Shift(yy_state_454)
     T_ELLIPSIS => Shift(yy_state_457)
     NT_pattern => Shift(yy_state_458)
-    NT_non_empty_list_semis_single_pattern_case_ => Shift(yy_state_508)
-    NT_single_pattern_cases => Shift(yy_state_509)
-    NT_list_semis_single_pattern_case_ => Shift(yy_state_515)
-    T_RBRACE => Reduce(0, NT_list_semis_single_pattern_case_, yy_action_589)
+    NT_non_empty_list_semis_single_pattern_case_ => Shift(yy_state_510)
+    NT_single_pattern_cases => Shift(yy_state_511)
+    NT_list_semis_single_pattern_case_ => Shift(yy_state_517)
+    T_RBRACE => Reduce(0, NT_list_semis_single_pattern_case_, yy_action_601)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_508(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_list_semis_single_pattern_case_, yy_action_558)
+fn yy_state_510(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_list_semis_single_pattern_case_, yy_action_570)
 }
 
 ///|
-fn yy_state_509(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_511(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RBRACE => Shift(yy_state_510)
+    T_RBRACE => Shift(yy_state_512)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_510(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_512(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_NORAISE => Shift(yy_state_511)
+    T_NORAISE => Shift(yy_state_513)
     T_EOF
     | T_RPAREN
     | T_COMMA
@@ -35677,21 +36462,21 @@ fn yy_state_510(_lookahead : YYSymbol) -> YYDecision {
     | T_RBRACKET
     | T_LBRACE
     | T_RBRACE
-    | T_AND => Reduce(5, NT_try_expr, yy_action_557)
+    | T_AND => Reduce(5, NT_try_expr, yy_action_569)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_511(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_513(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACE => Shift(yy_state_512)
+    T_LBRACE => Shift(yy_state_514)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_512(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_514(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_AMPER => Shift(yy_state_18)
     NT_qual_ident_ty => Shift(yy_state_24)
@@ -35720,135 +36505,135 @@ fn yy_state_512(_lookahead : YYSymbol) -> YYDecision {
     NT_single_pattern_case => Shift(yy_state_454)
     T_ELLIPSIS => Shift(yy_state_457)
     NT_pattern => Shift(yy_state_458)
-    NT_non_empty_list_semis_single_pattern_case_ => Shift(yy_state_508)
-    NT_single_pattern_cases => Shift(yy_state_513)
-    NT_list_semis_single_pattern_case_ => Shift(yy_state_515)
-    T_RBRACE => Reduce(0, NT_list_semis_single_pattern_case_, yy_action_589)
+    NT_non_empty_list_semis_single_pattern_case_ => Shift(yy_state_510)
+    NT_single_pattern_cases => Shift(yy_state_515)
+    NT_list_semis_single_pattern_case_ => Shift(yy_state_517)
+    T_RBRACE => Reduce(0, NT_list_semis_single_pattern_case_, yy_action_601)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_513(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_515(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RBRACE => Shift(yy_state_514)
+    T_RBRACE => Shift(yy_state_516)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_514(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(9, NT_try_expr, yy_action_555)
+fn yy_state_516(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(9, NT_try_expr, yy_action_568)
 }
 
 ///|
-fn yy_state_515(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_single_pattern_cases, yy_action_554)
+fn yy_state_517(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_single_pattern_cases, yy_action_567)
 }
 
 ///|
-fn yy_state_516(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_518(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_EXCLAMATION => Shift(yy_state_517)
-    T_LBRACE => Shift(yy_state_519)
+    T_EXCLAMATION => Shift(yy_state_519)
+    T_LBRACE => Shift(yy_state_521)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_517(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_519(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACE => Shift(yy_state_518)
+    T_LBRACE => Shift(yy_state_520)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_518(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_catch_keyword, yy_action_553)
+fn yy_state_520(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(3, NT_catch_keyword, yy_action_566)
 }
 
 ///|
-fn yy_state_519(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_catch_keyword, yy_action_552)
+fn yy_state_521(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(2, NT_catch_keyword, yy_action_565)
 }
 
 ///|
-fn yy_state_520(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_522(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_FOR => Shift(yy_state_521)
-    T_LOOP => Shift(yy_state_590)
-    T_WHILE => Shift(yy_state_595)
+    T_FOR => Shift(yy_state_523)
+    T_LOOP => Shift(yy_state_592)
+    T_WHILE => Shift(yy_state_597)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_521(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_523(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_foreach_binder => Shift(yy_state_522)
+    NT_foreach_binder => Shift(yy_state_524)
     NT_non_empty_list_commas_rev_separated_pair_binder_EQUAL_expr__ =>
-      Shift(yy_state_523)
-    NT_non_empty_list_commas_rev_foreach_binder_ => Shift(yy_state_545)
-    T_UNDERSCORE => Shift(yy_state_548)
+      Shift(yy_state_525)
+    NT_non_empty_list_commas_rev_foreach_binder_ => Shift(yy_state_547)
+    T_UNDERSCORE => Shift(yy_state_550)
     NT_non_empty_list_commas_no_trailing_separated_pair_binder_EQUAL_expr__ =>
-      Shift(yy_state_551)
-    T_LIDENT => Shift(yy_state_552)
-    NT_non_empty_list_commas_foreach_binder_ => Shift(yy_state_555)
-    NT_for_binders => Shift(yy_state_562)
+      Shift(yy_state_553)
+    T_LIDENT => Shift(yy_state_554)
+    NT_non_empty_list_commas_foreach_binder_ => Shift(yy_state_557)
+    NT_for_binders => Shift(yy_state_564)
     NT_list_commas_no_trailing_separated_pair_binder_EQUAL_expr__ =>
-      Shift(yy_state_589)
+      Shift(yy_state_591)
     T_SEMI | T_LBRACE =>
       Reduce(
         0,
         NT_list_commas_no_trailing_separated_pair_binder_EQUAL_expr__,
-        yy_action_551,
+        yy_action_564,
       )
     _ => Error
   }
 }
 
 ///|
-fn yy_state_522(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_524(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(
     1,
     NT_non_empty_list_commas_rev_foreach_binder_,
-    yy_action_550,
+    yy_action_563,
   )
 }
 
 ///|
-fn yy_state_523(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_525(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COMMA => Shift(yy_state_524)
+    T_COMMA => Shift(yy_state_526)
     T_SEMI | T_LBRACE =>
       Reduce(
         1,
         NT_non_empty_list_commas_no_trailing_separated_pair_binder_EQUAL_expr__,
-        yy_action_549,
+        yy_action_562,
       )
     _ => Error
   }
 }
 
 ///|
-fn yy_state_524(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_526(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LIDENT => Shift(yy_state_525)
+    T_LIDENT => Shift(yy_state_527)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_525(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_527(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_EQUAL => Shift(yy_state_526)
+    T_EQUAL => Shift(yy_state_528)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_526(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_528(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_multiline_string => Shift(yy_state_2)
     T_MULTILINE_INTERP => Shift(yy_state_4)
@@ -35902,48 +36687,48 @@ fn yy_state_526(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    NT_expr => Shift(yy_state_527)
-    T_POST_LABEL => Shift(yy_state_528)
-    T_LIDENT => Shift(yy_state_530)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    NT_expr => Shift(yy_state_529)
+    T_POST_LABEL => Shift(yy_state_530)
+    T_LIDENT => Shift(yy_state_532)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_527(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_529(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(
     5,
     NT_non_empty_list_commas_rev_separated_pair_binder_EQUAL_expr__,
-    yy_action_548,
+    yy_action_561,
   )
 }
 
 ///|
-fn yy_state_528(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_530(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_529)
+    T_COLON => Shift(yy_state_531)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_529(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_loop_label_colon, yy_action_547)
+fn yy_state_531(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(2, NT_loop_label_colon, yy_action_560)
 }
 
 ///|
-fn yy_state_530(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_532(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_QUESTION => Shift(yy_state_193)
-    T_FAT_ARROW => Shift(yy_state_531)
+    T_FAT_ARROW => Shift(yy_state_533)
     T_INFIX1
     | T_INFIX2
     | T_INFIX3
@@ -35979,13 +36764,13 @@ fn yy_state_530(_lookahead : YYSymbol) -> YYDecision {
     | T_RANGE_EXCLUSIVE_REV
     | T_IS
     | T_AND
-    | T_LEXMATCH_QUESTION => Reduce(1, NT_qual_ident_simple_expr, yy_action_757)
+    | T_LEXMATCH_QUESTION => Reduce(1, NT_qual_ident_simple_expr, yy_action_769)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_531(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_533(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_multiline_string => Shift(yy_state_2)
     T_MULTILINE_INTERP => Shift(yy_state_4)
@@ -36039,51 +36824,51 @@ fn yy_state_531(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    T_POST_LABEL => Shift(yy_state_528)
-    NT_expr_statement_no_break_continue_return => Shift(yy_state_532)
-    NT_expr => Shift(yy_state_533)
-    NT_left_value => Shift(yy_state_534)
-    T_ELLIPSIS => Shift(yy_state_539)
-    T_RAISE => Shift(yy_state_540)
-    T_PACKAGE_NAME => Shift(yy_state_542)
-    T_LIDENT => Shift(yy_state_544)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_POST_LABEL => Shift(yy_state_530)
+    NT_expr_statement_no_break_continue_return => Shift(yy_state_534)
+    NT_expr => Shift(yy_state_535)
+    NT_left_value => Shift(yy_state_536)
+    T_ELLIPSIS => Shift(yy_state_541)
+    T_RAISE => Shift(yy_state_542)
+    T_PACKAGE_NAME => Shift(yy_state_544)
+    T_LIDENT => Shift(yy_state_546)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_532(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_arrow_fn_expr, yy_action_546)
+fn yy_state_534(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(3, NT_arrow_fn_expr, yy_action_559)
 }
 
 ///|
-fn yy_state_533(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_535(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(
     1,
     NT_expr_statement_no_break_continue_return,
-    yy_action_545,
+    yy_action_558,
   )
 }
 
 ///|
-fn yy_state_534(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_536(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_EQUAL => Shift(yy_state_535)
-    T_AUGMENTED_ASSIGNMENT => Shift(yy_state_537)
+    T_EQUAL => Shift(yy_state_537)
+    T_AUGMENTED_ASSIGNMENT => Shift(yy_state_539)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_535(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_537(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_multiline_string => Shift(yy_state_2)
     T_MULTILINE_INTERP => Shift(yy_state_4)
@@ -36137,32 +36922,32 @@ fn yy_state_535(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    T_POST_LABEL => Shift(yy_state_528)
-    T_LIDENT => Shift(yy_state_530)
-    NT_expr => Shift(yy_state_536)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_POST_LABEL => Shift(yy_state_530)
+    T_LIDENT => Shift(yy_state_532)
+    NT_expr => Shift(yy_state_538)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_536(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_538(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(
     3,
     NT_expr_statement_no_break_continue_return,
-    yy_action_543,
+    yy_action_556,
   )
 }
 
 ///|
-fn yy_state_537(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_539(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_multiline_string => Shift(yy_state_2)
     T_MULTILINE_INTERP => Shift(yy_state_4)
@@ -36216,41 +37001,41 @@ fn yy_state_537(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    T_POST_LABEL => Shift(yy_state_528)
-    T_LIDENT => Shift(yy_state_530)
-    NT_expr => Shift(yy_state_538)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_POST_LABEL => Shift(yy_state_530)
+    T_LIDENT => Shift(yy_state_532)
+    NT_expr => Shift(yy_state_540)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_538(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_540(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(
     3,
     NT_expr_statement_no_break_continue_return,
-    yy_action_540,
+    yy_action_553,
   )
 }
 
 ///|
-fn yy_state_539(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_541(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(
     1,
     NT_expr_statement_no_break_continue_return,
-    yy_action_539,
+    yy_action_552,
   )
 }
 
 ///|
-fn yy_state_540(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_542(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_multiline_string => Shift(yy_state_2)
     T_MULTILINE_INTERP => Shift(yy_state_4)
@@ -36304,43 +37089,43 @@ fn yy_state_540(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    T_POST_LABEL => Shift(yy_state_528)
-    T_LIDENT => Shift(yy_state_530)
-    NT_expr => Shift(yy_state_541)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_POST_LABEL => Shift(yy_state_530)
+    T_LIDENT => Shift(yy_state_532)
+    NT_expr => Shift(yy_state_543)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_541(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_543(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(
     2,
     NT_expr_statement_no_break_continue_return,
-    yy_action_538,
+    yy_action_551,
   )
 }
 
 ///|
-fn yy_state_542(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_544(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_DOT_UIDENT => Shift(yy_state_190)
-    T_DOT_LIDENT => Shift(yy_state_543)
+    T_DOT_LIDENT => Shift(yy_state_545)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_543(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_545(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_AUGMENTED_ASSIGNMENT | T_EQUAL => Reduce(2, NT_qual_ident, yy_action_537)
+    T_AUGMENTED_ASSIGNMENT | T_EQUAL => Reduce(2, NT_qual_ident, yy_action_550)
     T_INFIX1
     | T_INFIX2
     | T_INFIX3
@@ -36377,18 +37162,18 @@ fn yy_state_543(_lookahead : YYSymbol) -> YYDecision {
     | T_RANGE_EXCLUSIVE_REV
     | T_IS
     | T_AND
-    | T_LEXMATCH_QUESTION => Reduce(2, NT_qual_ident_simple_expr, yy_action_758)
-    T_COLONCOLON => Reduce(2, NT_qual_ident_ty, yy_action_871)
+    | T_LEXMATCH_QUESTION => Reduce(2, NT_qual_ident_simple_expr, yy_action_770)
+    T_COLONCOLON => Reduce(2, NT_qual_ident_ty, yy_action_883)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_544(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_546(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_QUESTION => Shift(yy_state_193)
-    T_FAT_ARROW => Shift(yy_state_531)
-    T_AUGMENTED_ASSIGNMENT | T_EQUAL => Reduce(1, NT_qual_ident, yy_action_536)
+    T_FAT_ARROW => Shift(yy_state_533)
+    T_AUGMENTED_ASSIGNMENT | T_EQUAL => Reduce(1, NT_qual_ident, yy_action_549)
     T_INFIX1
     | T_INFIX2
     | T_INFIX3
@@ -36424,76 +37209,76 @@ fn yy_state_544(_lookahead : YYSymbol) -> YYDecision {
     | T_RANGE_EXCLUSIVE_REV
     | T_IS
     | T_AND
-    | T_LEXMATCH_QUESTION => Reduce(1, NT_qual_ident_simple_expr, yy_action_757)
+    | T_LEXMATCH_QUESTION => Reduce(1, NT_qual_ident_simple_expr, yy_action_769)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_545(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_547(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COMMA => Shift(yy_state_546)
-    NT_option_COMMA_ => Shift(yy_state_550)
-    T_IN => Reduce(0, NT_option_COMMA_, yy_action_865)
+    T_COMMA => Shift(yy_state_548)
+    NT_option_COMMA_ => Shift(yy_state_552)
+    T_IN => Reduce(0, NT_option_COMMA_, yy_action_877)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_546(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_548(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_foreach_binder => Shift(yy_state_547)
-    T_UNDERSCORE => Shift(yy_state_548)
-    T_LIDENT => Shift(yy_state_549)
-    T_IN => Reduce(1, NT_option_COMMA_, yy_action_863)
+    NT_foreach_binder => Shift(yy_state_549)
+    T_UNDERSCORE => Shift(yy_state_550)
+    T_LIDENT => Shift(yy_state_551)
+    T_IN => Reduce(1, NT_option_COMMA_, yy_action_875)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_547(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_549(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(
     3,
     NT_non_empty_list_commas_rev_foreach_binder_,
-    yy_action_535,
+    yy_action_548,
   )
 }
 
 ///|
-fn yy_state_548(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_foreach_binder, yy_action_534)
+fn yy_state_550(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_foreach_binder, yy_action_547)
 }
 
 ///|
-fn yy_state_549(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_foreach_binder, yy_action_533)
+fn yy_state_551(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_foreach_binder, yy_action_546)
 }
 
 ///|
-fn yy_state_550(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_non_empty_list_commas_foreach_binder_, yy_action_532)
+fn yy_state_552(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(2, NT_non_empty_list_commas_foreach_binder_, yy_action_545)
 }
 
 ///|
-fn yy_state_551(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_553(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(
     1,
     NT_list_commas_no_trailing_separated_pair_binder_EQUAL_expr__,
-    yy_action_531,
+    yy_action_544,
   )
 }
 
 ///|
-fn yy_state_552(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_554(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_EQUAL => Shift(yy_state_553)
-    T_COMMA | T_IN => Reduce(1, NT_foreach_binder, yy_action_533)
+    T_EQUAL => Shift(yy_state_555)
+    T_COMMA | T_IN => Reduce(1, NT_foreach_binder, yy_action_546)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_553(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_555(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_multiline_string => Shift(yy_state_2)
     T_MULTILINE_INTERP => Shift(yy_state_4)
@@ -36547,40 +37332,40 @@ fn yy_state_553(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    T_POST_LABEL => Shift(yy_state_528)
-    T_LIDENT => Shift(yy_state_530)
-    NT_expr => Shift(yy_state_554)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_POST_LABEL => Shift(yy_state_530)
+    T_LIDENT => Shift(yy_state_532)
+    NT_expr => Shift(yy_state_556)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_554(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_556(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(
     3,
     NT_non_empty_list_commas_rev_separated_pair_binder_EQUAL_expr__,
-    yy_action_529,
+    yy_action_542,
   )
 }
 
 ///|
-fn yy_state_555(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_557(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_IN => Shift(yy_state_556)
+    T_IN => Shift(yy_state_558)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_556(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_558(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_multiline_string => Shift(yy_state_2)
     T_MULTILINE_INTERP => Shift(yy_state_4)
@@ -36634,35 +37419,35 @@ fn yy_state_556(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    T_POST_LABEL => Shift(yy_state_528)
-    T_LIDENT => Shift(yy_state_530)
-    NT_expr => Shift(yy_state_557)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_POST_LABEL => Shift(yy_state_530)
+    T_LIDENT => Shift(yy_state_532)
+    NT_expr => Shift(yy_state_559)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_557(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_559(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LBRACE => Shift(yy_state_124)
-    NT_block_expr => Shift(yy_state_558)
+    NT_block_expr => Shift(yy_state_560)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_558(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_560(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_optional_else => Shift(yy_state_559)
-    T_ELSE => Shift(yy_state_560)
+    NT_optional_else => Shift(yy_state_561)
+    T_ELSE => Shift(yy_state_562)
     T_EOF
     | T_RPAREN
     | T_COMMA
@@ -36671,45 +37456,45 @@ fn yy_state_558(_lookahead : YYSymbol) -> YYDecision {
     | T_RBRACKET
     | T_LBRACE
     | T_RBRACE
-    | T_AND => Reduce(0, NT_optional_else, yy_action_528)
+    | T_AND => Reduce(0, NT_optional_else, yy_action_541)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_559(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(7, NT_foreach_expr, yy_action_527)
+fn yy_state_561(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(7, NT_foreach_expr, yy_action_540)
 }
 
 ///|
-fn yy_state_560(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_562(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LBRACE => Shift(yy_state_124)
-    NT_block_expr => Shift(yy_state_561)
+    NT_block_expr => Shift(yy_state_563)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_561(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_optional_else, yy_action_526)
+fn yy_state_563(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(2, NT_optional_else, yy_action_539)
 }
 
 ///|
-fn yy_state_562(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_564(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LBRACE => Shift(yy_state_124)
-    NT_block_expr => Shift(yy_state_563)
-    T_SEMI => Shift(yy_state_580)
+    NT_block_expr => Shift(yy_state_565)
+    T_SEMI => Shift(yy_state_582)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_563(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_565(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_ELSE => Shift(yy_state_560)
-    NT_optional_else => Shift(yy_state_564)
+    T_ELSE => Shift(yy_state_562)
+    NT_optional_else => Shift(yy_state_566)
     T_EOF
     | T_RPAREN
     | T_COMMA
@@ -36719,16 +37504,16 @@ fn yy_state_563(_lookahead : YYSymbol) -> YYDecision {
     | T_LBRACE
     | T_RBRACE
     | T_AND
-    | T_WHERE => Reduce(0, NT_optional_else, yy_action_528)
+    | T_WHERE => Reduce(0, NT_optional_else, yy_action_541)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_564(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_566(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_optional_where_clause => Shift(yy_state_565)
-    T_WHERE => Shift(yy_state_566)
+    NT_optional_where_clause => Shift(yy_state_567)
+    T_WHERE => Shift(yy_state_568)
     T_EOF
     | T_RPAREN
     | T_COMMA
@@ -36737,46 +37522,46 @@ fn yy_state_564(_lookahead : YYSymbol) -> YYDecision {
     | T_RBRACKET
     | T_LBRACE
     | T_RBRACE
-    | T_AND => Reduce(0, NT_optional_where_clause, yy_action_525)
+    | T_AND => Reduce(0, NT_optional_where_clause, yy_action_538)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_565(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(6, NT_for_expr, yy_action_524)
+fn yy_state_567(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(6, NT_for_expr, yy_action_537)
 }
 
 ///|
-fn yy_state_566(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_568(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACE => Shift(yy_state_567)
+    T_LBRACE => Shift(yy_state_569)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_567(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_569(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LIDENT => Shift(yy_state_568)
-    NT_non_empty_list_commas_rev_labeled_expr_ => Shift(yy_state_571)
-    NT_non_empty_list_commas_labeled_expr_ => Shift(yy_state_577)
-    NT_list_commas_labeled_expr_ => Shift(yy_state_578)
-    T_RBRACE => Reduce(0, NT_list_commas_labeled_expr_, yy_action_523)
+    T_LIDENT => Shift(yy_state_570)
+    NT_non_empty_list_commas_rev_labeled_expr_ => Shift(yy_state_573)
+    NT_non_empty_list_commas_labeled_expr_ => Shift(yy_state_579)
+    NT_list_commas_labeled_expr_ => Shift(yy_state_580)
+    T_RBRACE => Reduce(0, NT_list_commas_labeled_expr_, yy_action_536)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_568(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_570(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_569)
+    T_COLON => Shift(yy_state_571)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_569(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_571(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_multiline_string => Shift(yy_state_2)
     T_MULTILINE_INTERP => Shift(yy_state_4)
@@ -36830,64 +37615,64 @@ fn yy_state_569(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    T_POST_LABEL => Shift(yy_state_528)
-    T_LIDENT => Shift(yy_state_530)
-    NT_expr => Shift(yy_state_570)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_POST_LABEL => Shift(yy_state_530)
+    T_LIDENT => Shift(yy_state_532)
+    NT_expr => Shift(yy_state_572)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_570(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_572(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(
     3,
     NT_non_empty_list_commas_rev_labeled_expr_,
-    yy_action_522,
+    yy_action_535,
   )
 }
 
 ///|
-fn yy_state_571(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_573(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_option_COMMA_ => Shift(yy_state_572)
-    T_COMMA => Shift(yy_state_573)
-    T_RBRACE => Reduce(0, NT_option_COMMA_, yy_action_865)
+    NT_option_COMMA_ => Shift(yy_state_574)
+    T_COMMA => Shift(yy_state_575)
+    T_RBRACE => Reduce(0, NT_option_COMMA_, yy_action_877)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_572(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_non_empty_list_commas_labeled_expr_, yy_action_521)
+fn yy_state_574(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(2, NT_non_empty_list_commas_labeled_expr_, yy_action_534)
 }
 
 ///|
-fn yy_state_573(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_575(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LIDENT => Shift(yy_state_574)
-    T_RBRACE => Reduce(1, NT_option_COMMA_, yy_action_863)
+    T_LIDENT => Shift(yy_state_576)
+    T_RBRACE => Reduce(1, NT_option_COMMA_, yy_action_875)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_574(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_576(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_575)
+    T_COLON => Shift(yy_state_577)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_575(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_577(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_multiline_string => Shift(yy_state_2)
     T_MULTILINE_INTERP => Shift(yy_state_4)
@@ -36941,50 +37726,50 @@ fn yy_state_575(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    T_POST_LABEL => Shift(yy_state_528)
-    T_LIDENT => Shift(yy_state_530)
-    NT_expr => Shift(yy_state_576)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_POST_LABEL => Shift(yy_state_530)
+    T_LIDENT => Shift(yy_state_532)
+    NT_expr => Shift(yy_state_578)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_576(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_578(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(
     5,
     NT_non_empty_list_commas_rev_labeled_expr_,
-    yy_action_520,
+    yy_action_533,
   )
 }
 
 ///|
-fn yy_state_577(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_list_commas_labeled_expr_, yy_action_519)
+fn yy_state_579(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_list_commas_labeled_expr_, yy_action_532)
 }
 
 ///|
-fn yy_state_578(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_580(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RBRACE => Shift(yy_state_579)
+    T_RBRACE => Shift(yy_state_581)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_579(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(4, NT_optional_where_clause, yy_action_518)
+fn yy_state_581(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(4, NT_optional_where_clause, yy_action_531)
 }
 
 ///|
-fn yy_state_580(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_582(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_multiline_string => Shift(yy_state_2)
     T_MULTILINE_INTERP => Shift(yy_state_4)
@@ -37025,15 +37810,15 @@ fn yy_state_580(_lookahead : YYSymbol) -> YYDecision {
     NT_prefix_expr => Shift(yy_state_198)
     NT_range_expr => Shift(yy_state_209)
     NT_postfix_expr => Shift(yy_state_382)
-    NT_infix_expr => Shift(yy_state_581)
-    NT_option_infix_expr_ => Shift(yy_state_582)
-    T_SEMI => Reduce(0, NT_option_infix_expr_, yy_action_517)
+    NT_infix_expr => Shift(yy_state_583)
+    NT_option_infix_expr_ => Shift(yy_state_584)
+    T_SEMI => Reduce(0, NT_option_infix_expr_, yy_action_530)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_581(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_583(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_BARBAR => Shift(yy_state_384)
     T_AMPERAMPER => Shift(yy_state_386)
@@ -37046,61 +37831,61 @@ fn yy_state_581(_lookahead : YYSymbol) -> YYDecision {
     T_INFIX2 => Shift(yy_state_400)
     T_INFIX3 => Shift(yy_state_402)
     T_INFIX4 => Shift(yy_state_404)
-    T_SEMI => Reduce(1, NT_option_infix_expr_, yy_action_516)
+    T_SEMI => Reduce(1, NT_option_infix_expr_, yy_action_529)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_582(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_584(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_SEMI => Shift(yy_state_583)
+    T_SEMI => Shift(yy_state_585)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_583(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_585(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_non_empty_list_commas_rev_separated_pair_binder_EQUAL_expr__ =>
-      Shift(yy_state_523)
+      Shift(yy_state_525)
     NT_non_empty_list_commas_no_trailing_separated_pair_binder_EQUAL_expr__ =>
-      Shift(yy_state_551)
-    T_LIDENT => Shift(yy_state_584)
+      Shift(yy_state_553)
+    T_LIDENT => Shift(yy_state_586)
     NT_list_commas_no_trailing_separated_pair_binder_EQUAL_expr__ =>
-      Shift(yy_state_585)
+      Shift(yy_state_587)
     T_LBRACE =>
       Reduce(
         0,
         NT_list_commas_no_trailing_separated_pair_binder_EQUAL_expr__,
-        yy_action_551,
+        yy_action_564,
       )
     _ => Error
   }
 }
 
 ///|
-fn yy_state_584(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_586(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_EQUAL => Shift(yy_state_553)
+    T_EQUAL => Shift(yy_state_555)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_585(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_587(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LBRACE => Shift(yy_state_124)
-    NT_block_expr => Shift(yy_state_586)
+    NT_block_expr => Shift(yy_state_588)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_586(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_588(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_ELSE => Shift(yy_state_560)
-    NT_optional_else => Shift(yy_state_587)
+    T_ELSE => Shift(yy_state_562)
+    NT_optional_else => Shift(yy_state_589)
     T_EOF
     | T_RPAREN
     | T_COMMA
@@ -37110,16 +37895,16 @@ fn yy_state_586(_lookahead : YYSymbol) -> YYDecision {
     | T_LBRACE
     | T_RBRACE
     | T_AND
-    | T_WHERE => Reduce(0, NT_optional_else, yy_action_528)
+    | T_WHERE => Reduce(0, NT_optional_else, yy_action_541)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_587(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_589(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_WHERE => Shift(yy_state_566)
-    NT_optional_where_clause => Shift(yy_state_588)
+    T_WHERE => Shift(yy_state_568)
+    NT_optional_where_clause => Shift(yy_state_590)
     T_EOF
     | T_RPAREN
     | T_COMMA
@@ -37128,23 +37913,23 @@ fn yy_state_587(_lookahead : YYSymbol) -> YYDecision {
     | T_RBRACKET
     | T_LBRACE
     | T_RBRACE
-    | T_AND => Reduce(0, NT_optional_where_clause, yy_action_525)
+    | T_AND => Reduce(0, NT_optional_where_clause, yy_action_538)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_588(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(10, NT_for_expr, yy_action_515)
+fn yy_state_590(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(10, NT_for_expr, yy_action_528)
 }
 
 ///|
-fn yy_state_589(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_for_binders, yy_action_514)
+fn yy_state_591(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_for_binders, yy_action_527)
 }
 
 ///|
-fn yy_state_590(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_592(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_multiline_string => Shift(yy_state_2)
     T_MULTILINE_INTERP => Shift(yy_state_4)
@@ -37185,13 +37970,13 @@ fn yy_state_590(_lookahead : YYSymbol) -> YYDecision {
     NT_prefix_expr => Shift(yy_state_198)
     NT_range_expr => Shift(yy_state_209)
     NT_postfix_expr => Shift(yy_state_382)
-    NT_infix_expr => Shift(yy_state_591)
+    NT_infix_expr => Shift(yy_state_593)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_591(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_593(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_BARBAR => Shift(yy_state_384)
     T_AMPERAMPER => Shift(yy_state_386)
@@ -37204,13 +37989,13 @@ fn yy_state_591(_lookahead : YYSymbol) -> YYDecision {
     T_INFIX2 => Shift(yy_state_400)
     T_INFIX3 => Shift(yy_state_402)
     T_INFIX4 => Shift(yy_state_404)
-    T_LBRACE => Shift(yy_state_592)
+    T_LBRACE => Shift(yy_state_594)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_592(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_594(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_AMPER => Shift(yy_state_18)
     NT_qual_ident_ty => Shift(yy_state_24)
@@ -37239,28 +38024,28 @@ fn yy_state_592(_lookahead : YYSymbol) -> YYDecision {
     NT_single_pattern_case => Shift(yy_state_454)
     T_ELLIPSIS => Shift(yy_state_457)
     NT_pattern => Shift(yy_state_458)
-    NT_non_empty_list_semis_single_pattern_case_ => Shift(yy_state_508)
-    NT_list_semis_single_pattern_case_ => Shift(yy_state_593)
-    T_RBRACE => Reduce(0, NT_list_semis_single_pattern_case_, yy_action_589)
+    NT_non_empty_list_semis_single_pattern_case_ => Shift(yy_state_510)
+    NT_list_semis_single_pattern_case_ => Shift(yy_state_595)
+    T_RBRACE => Reduce(0, NT_list_semis_single_pattern_case_, yy_action_601)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_593(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_595(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RBRACE => Shift(yy_state_594)
+    T_RBRACE => Shift(yy_state_596)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_594(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(6, NT_loop_expr, yy_action_512)
+fn yy_state_596(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(6, NT_loop_expr, yy_action_525)
 }
 
 ///|
-fn yy_state_595(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_597(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_multiline_string => Shift(yy_state_2)
     T_MULTILINE_INTERP => Shift(yy_state_4)
@@ -37301,13 +38086,13 @@ fn yy_state_595(_lookahead : YYSymbol) -> YYDecision {
     NT_prefix_expr => Shift(yy_state_198)
     NT_range_expr => Shift(yy_state_209)
     NT_postfix_expr => Shift(yy_state_382)
-    NT_infix_expr => Shift(yy_state_596)
+    NT_infix_expr => Shift(yy_state_598)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_596(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_598(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LBRACE => Shift(yy_state_124)
     T_BARBAR => Shift(yy_state_384)
@@ -37321,16 +38106,16 @@ fn yy_state_596(_lookahead : YYSymbol) -> YYDecision {
     T_INFIX2 => Shift(yy_state_400)
     T_INFIX3 => Shift(yy_state_402)
     T_INFIX4 => Shift(yy_state_404)
-    NT_block_expr => Shift(yy_state_597)
+    NT_block_expr => Shift(yy_state_599)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_597(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_599(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_ELSE => Shift(yy_state_560)
-    NT_optional_else => Shift(yy_state_598)
+    T_ELSE => Shift(yy_state_562)
+    NT_optional_else => Shift(yy_state_600)
     T_EOF
     | T_RPAREN
     | T_COMMA
@@ -37339,23 +38124,23 @@ fn yy_state_597(_lookahead : YYSymbol) -> YYDecision {
     | T_RBRACKET
     | T_LBRACE
     | T_RBRACE
-    | T_AND => Reduce(0, NT_optional_else, yy_action_528)
+    | T_AND => Reduce(0, NT_optional_else, yy_action_541)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_598(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(5, NT_while_expr, yy_action_511)
+fn yy_state_600(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(5, NT_while_expr, yy_action_524)
 }
 
 ///|
-fn yy_state_599(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_expr_statement, yy_action_510)
+fn yy_state_601(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_expr_statement, yy_action_523)
 }
 
 ///|
-fn yy_state_600(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_602(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_multiline_string => Shift(yy_state_2)
     T_MULTILINE_INTERP => Shift(yy_state_4)
@@ -37409,35 +38194,35 @@ fn yy_state_600(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    T_POST_LABEL => Shift(yy_state_528)
-    T_LIDENT => Shift(yy_state_530)
-    NT_expr => Shift(yy_state_601)
-    NT_option_expr_ => Shift(yy_state_602)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
-    T_SEMI | T_RBRACE => Reduce(0, NT_option_expr_, yy_action_509)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_POST_LABEL => Shift(yy_state_530)
+    T_LIDENT => Shift(yy_state_532)
+    NT_expr => Shift(yy_state_603)
+    NT_option_expr_ => Shift(yy_state_604)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
+    T_SEMI | T_RBRACE => Reduce(0, NT_option_expr_, yy_action_522)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_601(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_option_expr_, yy_action_508)
+fn yy_state_603(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_option_expr_, yy_action_521)
 }
 
 ///|
-fn yy_state_602(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_expr_statement, yy_action_507)
+fn yy_state_604(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(2, NT_expr_statement, yy_action_520)
 }
 
 ///|
-fn yy_state_603(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_605(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_multiline_string => Shift(yy_state_2)
     T_MULTILINE_INTERP => Shift(yy_state_4)
@@ -37491,43 +38276,43 @@ fn yy_state_603(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    T_LIDENT => Shift(yy_state_530)
-    NT_expr => Shift(yy_state_604)
-    NT_non_empty_list_commas_rev_expr_ => Shift(yy_state_605)
-    NT_non_empty_list_commas_no_trailing_expr_ => Shift(yy_state_608)
-    NT_list_commas_no_trailing_expr_ => Shift(yy_state_609)
-    T_POST_LABEL => Shift(yy_state_610)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_LIDENT => Shift(yy_state_532)
+    NT_expr => Shift(yy_state_606)
+    NT_non_empty_list_commas_rev_expr_ => Shift(yy_state_607)
+    NT_non_empty_list_commas_no_trailing_expr_ => Shift(yy_state_610)
+    NT_list_commas_no_trailing_expr_ => Shift(yy_state_611)
+    T_POST_LABEL => Shift(yy_state_612)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
     T_SEMI | T_RBRACE =>
-      Reduce(0, NT_list_commas_no_trailing_expr_, yy_action_506)
+      Reduce(0, NT_list_commas_no_trailing_expr_, yy_action_519)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_604(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_non_empty_list_commas_rev_expr_, yy_action_505)
+fn yy_state_606(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_non_empty_list_commas_rev_expr_, yy_action_518)
 }
 
 ///|
-fn yy_state_605(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_607(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COMMA => Shift(yy_state_606)
+    T_COMMA => Shift(yy_state_608)
     T_SEMI | T_RBRACE =>
-      Reduce(1, NT_non_empty_list_commas_no_trailing_expr_, yy_action_504)
+      Reduce(1, NT_non_empty_list_commas_no_trailing_expr_, yy_action_517)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_606(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_608(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_multiline_string => Shift(yy_state_2)
     T_MULTILINE_INTERP => Shift(yy_state_4)
@@ -37581,38 +38366,38 @@ fn yy_state_606(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    T_POST_LABEL => Shift(yy_state_528)
-    T_LIDENT => Shift(yy_state_530)
-    NT_expr => Shift(yy_state_607)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_POST_LABEL => Shift(yy_state_530)
+    T_LIDENT => Shift(yy_state_532)
+    NT_expr => Shift(yy_state_609)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_607(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_non_empty_list_commas_rev_expr_, yy_action_503)
+fn yy_state_609(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(3, NT_non_empty_list_commas_rev_expr_, yy_action_516)
 }
 
 ///|
-fn yy_state_608(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_list_commas_no_trailing_expr_, yy_action_502)
+fn yy_state_610(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_list_commas_no_trailing_expr_, yy_action_515)
 }
 
 ///|
-fn yy_state_609(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_expr_statement, yy_action_501)
+fn yy_state_611(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(2, NT_expr_statement, yy_action_514)
 }
 
 ///|
-fn yy_state_610(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_612(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_multiline_string => Shift(yy_state_2)
     T_MULTILINE_INTERP => Shift(yy_state_4)
@@ -37666,34 +38451,34 @@ fn yy_state_610(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    T_POST_LABEL => Shift(yy_state_528)
-    T_COLON => Shift(yy_state_529)
-    T_LIDENT => Shift(yy_state_530)
-    NT_expr => Shift(yy_state_604)
-    NT_non_empty_list_commas_rev_expr_ => Shift(yy_state_605)
-    NT_non_empty_list_commas_no_trailing_expr_ => Shift(yy_state_608)
-    NT_list_commas_no_trailing_expr_ => Shift(yy_state_611)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_POST_LABEL => Shift(yy_state_530)
+    T_COLON => Shift(yy_state_531)
+    T_LIDENT => Shift(yy_state_532)
+    NT_expr => Shift(yy_state_606)
+    NT_non_empty_list_commas_rev_expr_ => Shift(yy_state_607)
+    NT_non_empty_list_commas_no_trailing_expr_ => Shift(yy_state_610)
+    NT_list_commas_no_trailing_expr_ => Shift(yy_state_613)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
     T_SEMI | T_RBRACE =>
-      Reduce(0, NT_list_commas_no_trailing_expr_, yy_action_506)
+      Reduce(0, NT_list_commas_no_trailing_expr_, yy_action_519)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_611(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_expr_statement, yy_action_500)
+fn yy_state_613(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(3, NT_expr_statement, yy_action_513)
 }
 
 ///|
-fn yy_state_612(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_614(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_multiline_string => Shift(yy_state_2)
     T_MULTILINE_INTERP => Shift(yy_state_4)
@@ -37747,30 +38532,30 @@ fn yy_state_612(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    T_LIDENT => Shift(yy_state_530)
-    NT_expr => Shift(yy_state_601)
-    NT_option_expr_ => Shift(yy_state_613)
-    T_POST_LABEL => Shift(yy_state_614)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
-    T_SEMI | T_RBRACE => Reduce(0, NT_option_expr_, yy_action_509)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_LIDENT => Shift(yy_state_532)
+    NT_expr => Shift(yy_state_603)
+    NT_option_expr_ => Shift(yy_state_615)
+    T_POST_LABEL => Shift(yy_state_616)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
+    T_SEMI | T_RBRACE => Reduce(0, NT_option_expr_, yy_action_522)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_613(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_expr_statement, yy_action_499)
+fn yy_state_615(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(2, NT_expr_statement, yy_action_512)
 }
 
 ///|
-fn yy_state_614(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_616(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_multiline_string => Shift(yy_state_2)
     T_MULTILINE_INTERP => Shift(yy_state_4)
@@ -37824,82 +38609,237 @@ fn yy_state_614(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    T_POST_LABEL => Shift(yy_state_528)
-    T_COLON => Shift(yy_state_529)
-    T_LIDENT => Shift(yy_state_530)
-    NT_expr => Shift(yy_state_601)
-    NT_option_expr_ => Shift(yy_state_615)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
-    T_SEMI | T_RBRACE => Reduce(0, NT_option_expr_, yy_action_509)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_POST_LABEL => Shift(yy_state_530)
+    T_COLON => Shift(yy_state_531)
+    T_LIDENT => Shift(yy_state_532)
+    NT_expr => Shift(yy_state_603)
+    NT_option_expr_ => Shift(yy_state_617)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
+    T_SEMI | T_RBRACE => Reduce(0, NT_option_expr_, yy_action_522)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_615(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_expr_statement, yy_action_498)
+fn yy_state_617(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(3, NT_expr_statement, yy_action_511)
 }
 
 ///|
-fn yy_state_616(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_list_semis_lex_case_, yy_action_497)
+fn yy_state_618(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    NT_multiline_string => Shift(yy_state_2)
+    T_MULTILINE_INTERP => Shift(yy_state_4)
+    T_MULTILINE_STRING => Shift(yy_state_5)
+    T_STRING => Shift(yy_state_6)
+    T_FLOAT => Shift(yy_state_7)
+    T_DOUBLE => Shift(yy_state_8)
+    T_INT => Shift(yy_state_9)
+    T_CHAR => Shift(yy_state_10)
+    T_BYTES => Shift(yy_state_11)
+    T_BYTE => Shift(yy_state_12)
+    T_FALSE => Shift(yy_state_13)
+    T_TRUE => Shift(yy_state_14)
+    T_INTERP => Shift(yy_state_15)
+    NT_non_empty_list_multiline_string_ => Shift(yy_state_16)
+    NT_simple_constant => Shift(yy_state_17)
+    T_AMPER => Shift(yy_state_18)
+    NT_qual_ident_ty => Shift(yy_state_24)
+    NT_tuple_expr => Shift(yy_state_25)
+    T_LBRACKET => Shift(yy_state_26)
+    NT_constr => Shift(yy_state_34)
+    NT_qual_ident_simple_expr => Shift(yy_state_35)
+    NT_atomic_expr => Shift(yy_state_36)
+    NT_anony_fn => Shift(yy_state_37)
+    T_LBRACE => Shift(yy_state_38)
+    T_FN => Shift(yy_state_47)
+    NT_type_name => Shift(yy_state_130)
+    T_ASYNC => Shift(yy_state_142)
+    T_EXCLAMATION => Shift(yy_state_168)
+    T_MINUS => Shift(yy_state_184)
+    T_PLUS => Shift(yy_state_186)
+    T_UIDENT => Shift(yy_state_188)
+    NT_prefix_expr => Shift(yy_state_198)
+    NT_range_expr => Shift(yy_state_209)
+    NT_postfix_expr => Shift(yy_state_382)
+    NT_infix_expr => Shift(yy_state_383)
+    T_UNDERSCORE => Shift(yy_state_406)
+    NT_qual_ident => Shift(yy_state_408)
+    NT_simple_expr => Shift(yy_state_409)
+    T_LPAREN => Shift(yy_state_414)
+    NT_pipe_expr => Shift(yy_state_447)
+    NT_arrow_fn_expr => Shift(yy_state_463)
+    NT_simple_try_expr => Shift(yy_state_464)
+    NT_lexmatch_expr => Shift(yy_state_465)
+    NT_match_expr => Shift(yy_state_466)
+    NT_if_expr => Shift(yy_state_467)
+    NT_try_expr => Shift(yy_state_468)
+    NT_while_expr => Shift(yy_state_469)
+    NT_foreach_expr => Shift(yy_state_470)
+    NT_for_expr => Shift(yy_state_471)
+    NT_loop_expr => Shift(yy_state_472)
+    T_LEXMATCH => Shift(yy_state_473)
+    NT_lexmatch_header => Shift(yy_state_479)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_POST_LABEL => Shift(yy_state_530)
+    NT_expr => Shift(yy_state_535)
+    NT_left_value => Shift(yy_state_536)
+    T_ELLIPSIS => Shift(yy_state_541)
+    T_RAISE => Shift(yy_state_542)
+    T_PACKAGE_NAME => Shift(yy_state_544)
+    T_LIDENT => Shift(yy_state_546)
+    NT_expr_statement_no_break_continue_return => Shift(yy_state_601)
+    T_RETURN => Shift(yy_state_602)
+    T_CONTINUE => Shift(yy_state_605)
+    T_BREAK => Shift(yy_state_614)
+    NT_expr_statement => Shift(yy_state_619)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
+    _ => Error
+  }
 }
 
 ///|
-fn yy_state_617(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_619(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(3, NT_lex_case, yy_action_510)
+}
+
+///|
+fn yy_state_620(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_list_semis_lex_case_, yy_action_509)
+}
+
+///|
+fn yy_state_621(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RBRACE => Shift(yy_state_618)
+    T_RBRACE => Shift(yy_state_622)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_618(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_lexmatch_expr, yy_action_496)
+fn yy_state_622(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(3, NT_lexmatch_expr, yy_action_508)
 }
 
 ///|
-fn yy_state_619(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(4, NT_single_pattern_case, yy_action_495)
+fn yy_state_623(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(4, NT_single_pattern_case, yy_action_507)
 }
 
 ///|
-fn yy_state_620(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_624(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(
     2,
     NT_non_empty_list_semis_single_pattern_case_,
-    yy_action_494,
+    yy_action_506,
   )
 }
 
 ///|
-fn yy_state_621(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_625(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RBRACE => Shift(yy_state_622)
+    T_RBRACE => Shift(yy_state_626)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_622(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(4, NT_simple_try_expr, yy_action_493)
+fn yy_state_626(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_NORAISE => Shift(yy_state_627)
+    T_EOF
+    | T_RPAREN
+    | T_COMMA
+    | T_COLON
+    | T_SEMI
+    | T_RBRACKET
+    | T_LBRACE
+    | T_RBRACE
+    | T_AND => Reduce(4, NT_simple_try_expr, yy_action_505)
+    _ => Error
+  }
 }
 
 ///|
-fn yy_state_623(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_627(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_LBRACE => Shift(yy_state_628)
+    _ => Error
+  }
+}
+
+///|
+fn yy_state_628(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_AMPER => Shift(yy_state_18)
+    NT_qual_ident_ty => Shift(yy_state_24)
+    T_UIDENT => Shift(yy_state_188)
+    T_LBRACE => Shift(yy_state_243)
+    T_LBRACKET => Shift(yy_state_247)
+    T_LPAREN => Shift(yy_state_261)
+    NT_constr => Shift(yy_state_262)
+    T_LIDENT => Shift(yy_state_275)
+    T_UNDERSCORE => Shift(yy_state_280)
+    T_BYTES => Shift(yy_state_281)
+    T_STRING => Shift(yy_state_282)
+    T_MINUS => Shift(yy_state_283)
+    T_FLOAT => Shift(yy_state_287)
+    T_DOUBLE => Shift(yy_state_288)
+    T_BYTE => Shift(yy_state_289)
+    T_INT => Shift(yy_state_290)
+    T_CHAR => Shift(yy_state_291)
+    T_FALSE => Shift(yy_state_292)
+    T_TRUE => Shift(yy_state_293)
+    NT_simple_pattern => Shift(yy_state_294)
+    NT_type_name => Shift(yy_state_297)
+    T_PACKAGE_NAME => Shift(yy_state_300)
+    NT_range_pattern => Shift(yy_state_303)
+    NT_or_pattern => Shift(yy_state_306)
+    NT_single_pattern_case => Shift(yy_state_454)
+    T_ELLIPSIS => Shift(yy_state_457)
+    NT_pattern => Shift(yy_state_458)
+    NT_non_empty_list_semis_single_pattern_case_ => Shift(yy_state_510)
+    NT_list_semis_single_pattern_case_ => Shift(yy_state_517)
+    NT_single_pattern_cases => Shift(yy_state_629)
+    T_RBRACE => Reduce(0, NT_list_semis_single_pattern_case_, yy_action_601)
+    _ => Error
+  }
+}
+
+///|
+fn yy_state_629(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_RBRACE => Shift(yy_state_630)
+    _ => Error
+  }
+}
+
+///|
+fn yy_state_630(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(8, NT_simple_try_expr, yy_action_503)
+}
+
+///|
+fn yy_state_631(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_QUESTION => Shift(yy_state_193)
     T_COLON => Shift(yy_state_429)
-    T_FAT_ARROW => Shift(yy_state_531)
-    T_COMMA => Shift(yy_state_624)
-    T_RPAREN => Shift(yy_state_628)
+    T_FAT_ARROW => Shift(yy_state_533)
+    T_COMMA => Shift(yy_state_632)
+    T_RPAREN => Shift(yy_state_636)
     T_INFIX1
     | T_INFIX2
     | T_INFIX3
@@ -37926,13 +38866,13 @@ fn yy_state_623(_lookahead : YYSymbol) -> YYDecision {
     | T_RANGE_INCLUSIVE_REV
     | T_RANGE_EXCLUSIVE_REV
     | T_IS
-    | T_LEXMATCH_QUESTION => Reduce(1, NT_qual_ident_simple_expr, yy_action_757)
+    | T_LEXMATCH_QUESTION => Reduce(1, NT_qual_ident_simple_expr, yy_action_769)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_624(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_632(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_multiline_string => Shift(yy_state_2)
     T_MULTILINE_INTERP => Shift(yy_state_4)
@@ -37989,37 +38929,37 @@ fn yy_state_624(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    T_POST_LABEL => Shift(yy_state_528)
-    T_LIDENT => Shift(yy_state_623)
-    NT_non_empty_tuple_elems_with_prefix => Shift(yy_state_625)
-    NT_arrow_fn_prefix_no_constraint => Shift(yy_state_626)
-    T_RPAREN => Shift(yy_state_627)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_POST_LABEL => Shift(yy_state_530)
+    T_LIDENT => Shift(yy_state_631)
+    NT_non_empty_tuple_elems_with_prefix => Shift(yy_state_633)
+    NT_arrow_fn_prefix_no_constraint => Shift(yy_state_634)
+    T_RPAREN => Shift(yy_state_635)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_625(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_non_empty_tuple_elems_with_prefix, yy_action_492)
+fn yy_state_633(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(3, NT_non_empty_tuple_elems_with_prefix, yy_action_502)
 }
 
 ///|
-fn yy_state_626(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_arrow_fn_prefix_no_constraint, yy_action_491)
+fn yy_state_634(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(3, NT_arrow_fn_prefix_no_constraint, yy_action_501)
 }
 
 ///|
-fn yy_state_627(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_635(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_FAT_ARROW => Reduce(3, NT_arrow_fn_prefix, yy_action_600)
+    T_FAT_ARROW => Reduce(3, NT_arrow_fn_prefix, yy_action_612)
     T_INFIX1
     | T_INFIX2
     | T_INFIX3
@@ -38057,15 +38997,15 @@ fn yy_state_627(_lookahead : YYSymbol) -> YYDecision {
     | T_IS
     | T_AND
     | T_LEXMATCH_QUESTION =>
-      Reduce(3, NT_arrow_fn_prefix_no_constraint, yy_action_489)
+      Reduce(3, NT_arrow_fn_prefix_no_constraint, yy_action_499)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_628(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_636(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_FAT_ARROW => Reduce(2, NT_arrow_fn_prefix, yy_action_599)
+    T_FAT_ARROW => Reduce(2, NT_arrow_fn_prefix, yy_action_611)
     T_INFIX1
     | T_INFIX2
     | T_INFIX3
@@ -38103,15 +39043,15 @@ fn yy_state_628(_lookahead : YYSymbol) -> YYDecision {
     | T_IS
     | T_AND
     | T_LEXMATCH_QUESTION =>
-      Reduce(2, NT_arrow_fn_prefix_no_constraint, yy_action_487)
+      Reduce(2, NT_arrow_fn_prefix_no_constraint, yy_action_497)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_629(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_637(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_FAT_ARROW => Shift(yy_state_630)
+    T_FAT_ARROW => Shift(yy_state_638)
     T_INFIX1
     | T_INFIX2
     | T_INFIX3
@@ -38148,13 +39088,13 @@ fn yy_state_629(_lookahead : YYSymbol) -> YYDecision {
     | T_RANGE_EXCLUSIVE_REV
     | T_IS
     | T_AND
-    | T_LEXMATCH_QUESTION => Reduce(2, NT_tuple_expr, yy_action_774)
+    | T_LEXMATCH_QUESTION => Reduce(2, NT_tuple_expr, yy_action_786)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_630(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_638(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_multiline_string => Shift(yy_state_2)
     T_MULTILINE_INTERP => Shift(yy_state_4)
@@ -38208,41 +39148,41 @@ fn yy_state_630(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    T_POST_LABEL => Shift(yy_state_528)
-    NT_expr => Shift(yy_state_533)
-    NT_left_value => Shift(yy_state_534)
-    T_ELLIPSIS => Shift(yy_state_539)
-    T_RAISE => Shift(yy_state_540)
-    T_PACKAGE_NAME => Shift(yy_state_542)
-    T_LIDENT => Shift(yy_state_544)
-    NT_expr_statement_no_break_continue_return => Shift(yy_state_631)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_POST_LABEL => Shift(yy_state_530)
+    NT_expr => Shift(yy_state_535)
+    NT_left_value => Shift(yy_state_536)
+    T_ELLIPSIS => Shift(yy_state_541)
+    T_RAISE => Shift(yy_state_542)
+    T_PACKAGE_NAME => Shift(yy_state_544)
+    T_LIDENT => Shift(yy_state_546)
+    NT_expr_statement_no_break_continue_return => Shift(yy_state_639)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_631(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(4, NT_arrow_fn_expr, yy_action_486)
+fn yy_state_639(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(4, NT_arrow_fn_expr, yy_action_496)
 }
 
 ///|
-fn yy_state_632(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_640(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_FAT_ARROW => Shift(yy_state_633)
+    T_FAT_ARROW => Shift(yy_state_641)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_633(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_641(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_multiline_string => Shift(yy_state_2)
     T_MULTILINE_INTERP => Shift(yy_state_4)
@@ -38296,39 +39236,39 @@ fn yy_state_633(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    T_POST_LABEL => Shift(yy_state_528)
-    NT_expr => Shift(yy_state_533)
-    NT_left_value => Shift(yy_state_534)
-    T_ELLIPSIS => Shift(yy_state_539)
-    T_RAISE => Shift(yy_state_540)
-    T_PACKAGE_NAME => Shift(yy_state_542)
-    T_LIDENT => Shift(yy_state_544)
-    NT_expr_statement_no_break_continue_return => Shift(yy_state_634)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_POST_LABEL => Shift(yy_state_530)
+    NT_expr => Shift(yy_state_535)
+    NT_left_value => Shift(yy_state_536)
+    T_ELLIPSIS => Shift(yy_state_541)
+    T_RAISE => Shift(yy_state_542)
+    T_PACKAGE_NAME => Shift(yy_state_544)
+    T_LIDENT => Shift(yy_state_546)
+    NT_expr_statement_no_break_continue_return => Shift(yy_state_642)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_634(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(4, NT_arrow_fn_expr, yy_action_485)
+fn yy_state_642(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(4, NT_arrow_fn_expr, yy_action_495)
 }
 
 ///|
-fn yy_state_635(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_643(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_QUESTION => Shift(yy_state_193)
-    T_FAT_ARROW => Shift(yy_state_531)
-    T_COMMA => Shift(yy_state_624)
-    T_RPAREN => Shift(yy_state_628)
-    T_COLON => Shift(yy_state_636)
+    T_FAT_ARROW => Shift(yy_state_533)
+    T_COMMA => Shift(yy_state_632)
+    T_RPAREN => Shift(yy_state_636)
+    T_COLON => Shift(yy_state_644)
     T_INFIX1
     | T_INFIX2
     | T_INFIX3
@@ -38355,13 +39295,13 @@ fn yy_state_635(_lookahead : YYSymbol) -> YYDecision {
     | T_RANGE_INCLUSIVE_REV
     | T_RANGE_EXCLUSIVE_REV
     | T_IS
-    | T_LEXMATCH_QUESTION => Reduce(1, NT_qual_ident_simple_expr, yy_action_757)
+    | T_LEXMATCH_QUESTION => Reduce(1, NT_qual_ident_simple_expr, yy_action_769)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_636(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_644(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -38370,24 +39310,24 @@ fn yy_state_636(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_type_ => Shift(yy_state_637)
+    NT_type_ => Shift(yy_state_645)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_637(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_645(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_COMMA => Shift(yy_state_431)
-    T_RPAREN => Shift(yy_state_638)
+    T_RPAREN => Shift(yy_state_646)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_638(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_646(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_FAT_ARROW => Reduce(4, NT_arrow_fn_prefix, yy_action_602)
+    T_FAT_ARROW => Reduce(4, NT_arrow_fn_prefix, yy_action_614)
     T_INFIX1
     | T_INFIX2
     | T_INFIX3
@@ -38424,23 +39364,23 @@ fn yy_state_638(_lookahead : YYSymbol) -> YYDecision {
     | T_RANGE_EXCLUSIVE_REV
     | T_IS
     | T_AND
-    | T_LEXMATCH_QUESTION => Reduce(5, NT_tuple_expr, yy_action_484)
+    | T_LEXMATCH_QUESTION => Reduce(5, NT_tuple_expr, yy_action_494)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_639(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_647(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_529)
-    T_EQUAL => Shift(yy_state_640)
-    T_RPAREN | T_COMMA => Reduce(1, NT_argument, yy_action_483)
+    T_COLON => Shift(yy_state_531)
+    T_EQUAL => Shift(yy_state_648)
+    T_RPAREN | T_COMMA => Reduce(1, NT_argument, yy_action_493)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_640(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_648(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_multiline_string => Shift(yy_state_2)
     T_MULTILINE_INTERP => Shift(yy_state_4)
@@ -38494,33 +39434,33 @@ fn yy_state_640(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    T_POST_LABEL => Shift(yy_state_528)
-    T_LIDENT => Shift(yy_state_530)
-    NT_expr => Shift(yy_state_641)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_POST_LABEL => Shift(yy_state_530)
+    T_LIDENT => Shift(yy_state_532)
+    NT_expr => Shift(yy_state_649)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_641(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_argument, yy_action_482)
+fn yy_state_649(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(3, NT_argument, yy_action_492)
 }
 
 ///|
-fn yy_state_642(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_650(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_FAT_ARROW => Shift(yy_state_531)
-    NT_optional_question => Shift(yy_state_643)
-    T_QUESTION => Shift(yy_state_646)
-    T_EQUAL => Reduce(0, NT_optional_question, yy_action_481)
+    T_FAT_ARROW => Shift(yy_state_533)
+    NT_optional_question => Shift(yy_state_651)
+    T_QUESTION => Shift(yy_state_654)
+    T_EQUAL => Reduce(0, NT_optional_question, yy_action_491)
     T_INFIX1
     | T_INFIX2
     | T_INFIX3
@@ -38549,21 +39489,21 @@ fn yy_state_642(_lookahead : YYSymbol) -> YYDecision {
     | T_RANGE_INCLUSIVE_REV
     | T_RANGE_EXCLUSIVE_REV
     | T_IS
-    | T_LEXMATCH_QUESTION => Reduce(1, NT_qual_ident_simple_expr, yy_action_757)
+    | T_LEXMATCH_QUESTION => Reduce(1, NT_qual_ident_simple_expr, yy_action_769)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_643(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_651(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_EQUAL => Shift(yy_state_644)
+    T_EQUAL => Shift(yy_state_652)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_644(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_652(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_multiline_string => Shift(yy_state_2)
     T_MULTILINE_INTERP => Shift(yy_state_4)
@@ -38617,46 +39557,46 @@ fn yy_state_644(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    T_POST_LABEL => Shift(yy_state_528)
-    T_LIDENT => Shift(yy_state_530)
-    NT_expr => Shift(yy_state_645)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_POST_LABEL => Shift(yy_state_530)
+    T_LIDENT => Shift(yy_state_532)
+    NT_expr => Shift(yy_state_653)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_645(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(4, NT_argument, yy_action_479)
+fn yy_state_653(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(4, NT_argument, yy_action_489)
 }
 
 ///|
-fn yy_state_646(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_654(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LPAREN => Shift(yy_state_194)
-    T_EQUAL => Reduce(1, NT_optional_question, yy_action_478)
-    T_RPAREN | T_COMMA => Reduce(2, NT_argument, yy_action_477)
+    T_EQUAL => Reduce(1, NT_optional_question, yy_action_488)
+    T_RPAREN | T_COMMA => Reduce(2, NT_argument, yy_action_487)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_647(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_655(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LPAREN => Shift(yy_state_648)
+    T_LPAREN => Shift(yy_state_656)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_648(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_656(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_multiline_string => Shift(yy_state_2)
     T_MULTILINE_INTERP => Shift(yy_state_4)
@@ -38714,37 +39654,37 @@ fn yy_state_648(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    T_POST_LABEL => Shift(yy_state_639)
-    T_LIDENT => Shift(yy_state_642)
-    NT_list_commas_argument_ => Shift(yy_state_649)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
-    T_RPAREN => Reduce(0, NT_list_commas_argument_, yy_action_780)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_POST_LABEL => Shift(yy_state_647)
+    T_LIDENT => Shift(yy_state_650)
+    NT_list_commas_argument_ => Shift(yy_state_657)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
+    T_RPAREN => Reduce(0, NT_list_commas_argument_, yy_action_792)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_649(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_657(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RPAREN => Shift(yy_state_650)
+    T_RPAREN => Shift(yy_state_658)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_650(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(5, NT_simple_expr, yy_action_476)
+fn yy_state_658(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(5, NT_simple_expr, yy_action_486)
 }
 
 ///|
-fn yy_state_651(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_659(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_multiline_string => Shift(yy_state_2)
     T_MULTILINE_INTERP => Shift(yy_state_4)
@@ -38802,37 +39742,37 @@ fn yy_state_651(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    T_POST_LABEL => Shift(yy_state_639)
-    T_LIDENT => Shift(yy_state_642)
-    NT_list_commas_argument_ => Shift(yy_state_652)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
-    T_RPAREN => Reduce(0, NT_list_commas_argument_, yy_action_780)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_POST_LABEL => Shift(yy_state_647)
+    T_LIDENT => Shift(yy_state_650)
+    NT_list_commas_argument_ => Shift(yy_state_660)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
+    T_RPAREN => Reduce(0, NT_list_commas_argument_, yy_action_792)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_652(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_660(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RPAREN => Shift(yy_state_653)
+    T_RPAREN => Shift(yy_state_661)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_653(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(4, NT_simple_expr, yy_action_475)
+fn yy_state_661(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(4, NT_simple_expr, yy_action_485)
 }
 
 ///|
-fn yy_state_654(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_662(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_multiline_string => Shift(yy_state_2)
     T_MULTILINE_INTERP => Shift(yy_state_4)
@@ -38886,33 +39826,33 @@ fn yy_state_654(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    T_POST_LABEL => Shift(yy_state_528)
-    T_LIDENT => Shift(yy_state_530)
-    NT_option_expr_ => Shift(yy_state_655)
-    NT_expr => Shift(yy_state_659)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
-    T_COLON => Reduce(0, NT_option_expr_, yy_action_509)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_POST_LABEL => Shift(yy_state_530)
+    T_LIDENT => Shift(yy_state_532)
+    NT_option_expr_ => Shift(yy_state_663)
+    NT_expr => Shift(yy_state_667)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
+    T_COLON => Reduce(0, NT_option_expr_, yy_action_522)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_655(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_663(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_656)
+    T_COLON => Shift(yy_state_664)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_656(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_664(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_multiline_string => Shift(yy_state_2)
     T_MULTILINE_INTERP => Shift(yy_state_4)
@@ -38966,49 +39906,49 @@ fn yy_state_656(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    T_POST_LABEL => Shift(yy_state_528)
-    T_LIDENT => Shift(yy_state_530)
-    NT_expr => Shift(yy_state_601)
-    NT_option_expr_ => Shift(yy_state_657)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
-    T_RBRACKET => Reduce(0, NT_option_expr_, yy_action_509)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_POST_LABEL => Shift(yy_state_530)
+    T_LIDENT => Shift(yy_state_532)
+    NT_expr => Shift(yy_state_603)
+    NT_option_expr_ => Shift(yy_state_665)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
+    T_RBRACKET => Reduce(0, NT_option_expr_, yy_action_522)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_657(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_665(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RBRACKET => Shift(yy_state_658)
+    T_RBRACKET => Shift(yy_state_666)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_658(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(6, NT_simple_expr, yy_action_474)
+fn yy_state_666(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(6, NT_simple_expr, yy_action_484)
 }
 
 ///|
-fn yy_state_659(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_667(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RBRACKET => Shift(yy_state_660)
-    T_COLON => Reduce(1, NT_option_expr_, yy_action_508)
+    T_RBRACKET => Shift(yy_state_668)
+    T_COLON => Reduce(1, NT_option_expr_, yy_action_521)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_660(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_668(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_AUGMENTED_ASSIGNMENT | T_EQUAL => Reduce(4, NT_left_value, yy_action_472)
+    T_AUGMENTED_ASSIGNMENT | T_EQUAL => Reduce(4, NT_left_value, yy_action_482)
     T_INFIX1
     | T_INFIX2
     | T_INFIX3
@@ -39045,15 +39985,15 @@ fn yy_state_660(_lookahead : YYSymbol) -> YYDecision {
     | T_RANGE_EXCLUSIVE_REV
     | T_IS
     | T_AND
-    | T_LEXMATCH_QUESTION => Reduce(4, NT_simple_expr, yy_action_473)
+    | T_LEXMATCH_QUESTION => Reduce(4, NT_simple_expr, yy_action_483)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_661(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_669(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_AUGMENTED_ASSIGNMENT | T_EQUAL => Reduce(2, NT_left_value, yy_action_470)
+    T_AUGMENTED_ASSIGNMENT | T_EQUAL => Reduce(2, NT_left_value, yy_action_480)
     T_INFIX1
     | T_INFIX2
     | T_INFIX3
@@ -39090,18 +40030,18 @@ fn yy_state_661(_lookahead : YYSymbol) -> YYDecision {
     | T_RANGE_EXCLUSIVE_REV
     | T_IS
     | T_AND
-    | T_LEXMATCH_QUESTION => Reduce(2, NT_simple_expr, yy_action_781)
+    | T_LEXMATCH_QUESTION => Reduce(2, NT_simple_expr, yy_action_793)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_662(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_670(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_QUESTION => Shift(yy_state_663)
-    T_EXCLAMATION => Shift(yy_state_667)
-    T_LPAREN => Shift(yy_state_671)
-    T_AUGMENTED_ASSIGNMENT | T_EQUAL => Reduce(2, NT_left_value, yy_action_467)
+    T_QUESTION => Shift(yy_state_671)
+    T_EXCLAMATION => Shift(yy_state_675)
+    T_LPAREN => Shift(yy_state_679)
+    T_AUGMENTED_ASSIGNMENT | T_EQUAL => Reduce(2, NT_left_value, yy_action_477)
     T_INFIX1
     | T_INFIX2
     | T_INFIX3
@@ -39135,21 +40075,21 @@ fn yy_state_662(_lookahead : YYSymbol) -> YYDecision {
     | T_RANGE_EXCLUSIVE_REV
     | T_IS
     | T_AND
-    | T_LEXMATCH_QUESTION => Reduce(2, NT_simple_expr, yy_action_469)
+    | T_LEXMATCH_QUESTION => Reduce(2, NT_simple_expr, yy_action_479)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_663(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_671(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LPAREN => Shift(yy_state_664)
+    T_LPAREN => Shift(yy_state_672)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_664(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_672(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_multiline_string => Shift(yy_state_2)
     T_MULTILINE_INTERP => Shift(yy_state_4)
@@ -39207,45 +40147,45 @@ fn yy_state_664(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    T_POST_LABEL => Shift(yy_state_639)
-    T_LIDENT => Shift(yy_state_642)
-    NT_list_commas_argument_ => Shift(yy_state_665)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
-    T_RPAREN => Reduce(0, NT_list_commas_argument_, yy_action_780)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_POST_LABEL => Shift(yy_state_647)
+    T_LIDENT => Shift(yy_state_650)
+    NT_list_commas_argument_ => Shift(yy_state_673)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
+    T_RPAREN => Reduce(0, NT_list_commas_argument_, yy_action_792)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_665(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_673(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RPAREN => Shift(yy_state_666)
+    T_RPAREN => Shift(yy_state_674)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_666(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(6, NT_simple_expr, yy_action_466)
+fn yy_state_674(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(6, NT_simple_expr, yy_action_476)
 }
 
 ///|
-fn yy_state_667(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_675(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LPAREN => Shift(yy_state_668)
+    T_LPAREN => Shift(yy_state_676)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_668(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_676(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_multiline_string => Shift(yy_state_2)
     T_MULTILINE_INTERP => Shift(yy_state_4)
@@ -39303,37 +40243,37 @@ fn yy_state_668(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    T_POST_LABEL => Shift(yy_state_639)
-    T_LIDENT => Shift(yy_state_642)
-    NT_list_commas_argument_ => Shift(yy_state_669)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
-    T_RPAREN => Reduce(0, NT_list_commas_argument_, yy_action_780)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_POST_LABEL => Shift(yy_state_647)
+    T_LIDENT => Shift(yy_state_650)
+    NT_list_commas_argument_ => Shift(yy_state_677)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
+    T_RPAREN => Reduce(0, NT_list_commas_argument_, yy_action_792)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_669(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_677(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RPAREN => Shift(yy_state_670)
+    T_RPAREN => Shift(yy_state_678)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_670(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(6, NT_simple_expr, yy_action_465)
+fn yy_state_678(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(6, NT_simple_expr, yy_action_475)
 }
 
 ///|
-fn yy_state_671(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_679(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_multiline_string => Shift(yy_state_2)
     T_MULTILINE_INTERP => Shift(yy_state_4)
@@ -39391,47 +40331,47 @@ fn yy_state_671(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    T_POST_LABEL => Shift(yy_state_639)
-    T_LIDENT => Shift(yy_state_642)
-    NT_list_commas_argument_ => Shift(yy_state_672)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
-    T_RPAREN => Reduce(0, NT_list_commas_argument_, yy_action_780)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_POST_LABEL => Shift(yy_state_647)
+    T_LIDENT => Shift(yy_state_650)
+    NT_list_commas_argument_ => Shift(yy_state_680)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
+    T_RPAREN => Reduce(0, NT_list_commas_argument_, yy_action_792)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_672(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_680(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RPAREN => Shift(yy_state_673)
+    T_RPAREN => Shift(yy_state_681)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_673(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(5, NT_simple_expr, yy_action_464)
+fn yy_state_681(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(5, NT_simple_expr, yy_action_474)
 }
 
 ///|
-fn yy_state_674(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_arrow_fn_expr, yy_action_463)
+fn yy_state_682(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(3, NT_arrow_fn_expr, yy_action_473)
 }
 
 ///|
-fn yy_state_675(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_683(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_FAT_ARROW => Shift(yy_state_407)
-    T_COLON => Shift(yy_state_676)
-    T_COMMA => Shift(yy_state_679)
-    T_RPAREN => Shift(yy_state_682)
+    T_COLON => Shift(yy_state_684)
+    T_COMMA => Shift(yy_state_687)
+    T_RPAREN => Shift(yy_state_690)
     T_INFIX1
     | T_INFIX2
     | T_INFIX3
@@ -39459,13 +40399,13 @@ fn yy_state_675(_lookahead : YYSymbol) -> YYDecision {
     | T_RANGE_INCLUSIVE_REV
     | T_RANGE_EXCLUSIVE_REV
     | T_IS
-    | T_LEXMATCH_QUESTION => Reduce(1, NT_simple_expr, yy_action_775)
+    | T_LEXMATCH_QUESTION => Reduce(1, NT_simple_expr, yy_action_787)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_676(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_684(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -39474,26 +40414,26 @@ fn yy_state_676(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_type_ => Shift(yy_state_677)
+    NT_type_ => Shift(yy_state_685)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_677(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_685(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RPAREN => Shift(yy_state_678)
+    T_RPAREN => Shift(yy_state_686)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_678(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(5, NT_tuple_expr, yy_action_597)
+fn yy_state_686(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(5, NT_tuple_expr, yy_action_609)
 }
 
 ///|
-fn yy_state_679(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_687(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_multiline_string => Shift(yy_state_2)
     T_MULTILINE_INTERP => Shift(yy_state_4)
@@ -39550,33 +40490,33 @@ fn yy_state_679(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    T_POST_LABEL => Shift(yy_state_528)
-    T_RPAREN => Shift(yy_state_680)
-    T_UNDERSCORE => Shift(yy_state_681)
-    T_LIDENT => Shift(yy_state_683)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_POST_LABEL => Shift(yy_state_530)
+    T_RPAREN => Shift(yy_state_688)
+    T_UNDERSCORE => Shift(yy_state_689)
+    T_LIDENT => Shift(yy_state_691)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_680(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_arrow_fn_prefix_no_constraint, yy_action_594)
+fn yy_state_688(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(3, NT_arrow_fn_prefix_no_constraint, yy_action_606)
 }
 
 ///|
-fn yy_state_681(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_689(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_FAT_ARROW => Shift(yy_state_407)
-    T_COMMA => Shift(yy_state_679)
-    T_RPAREN => Shift(yy_state_682)
+    T_COMMA => Shift(yy_state_687)
+    T_RPAREN => Shift(yy_state_690)
     T_INFIX1
     | T_INFIX2
     | T_INFIX3
@@ -39604,23 +40544,23 @@ fn yy_state_681(_lookahead : YYSymbol) -> YYDecision {
     | T_RANGE_INCLUSIVE_REV
     | T_RANGE_EXCLUSIVE_REV
     | T_IS
-    | T_LEXMATCH_QUESTION => Reduce(1, NT_simple_expr, yy_action_775)
+    | T_LEXMATCH_QUESTION => Reduce(1, NT_simple_expr, yy_action_787)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_682(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_arrow_fn_prefix_no_constraint, yy_action_593)
+fn yy_state_690(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(2, NT_arrow_fn_prefix_no_constraint, yy_action_605)
 }
 
 ///|
-fn yy_state_683(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_691(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_QUESTION => Shift(yy_state_193)
-    T_FAT_ARROW => Shift(yy_state_531)
-    T_COMMA => Shift(yy_state_684)
-    T_RPAREN => Shift(yy_state_686)
+    T_FAT_ARROW => Shift(yy_state_533)
+    T_COMMA => Shift(yy_state_692)
+    T_RPAREN => Shift(yy_state_694)
     T_INFIX1
     | T_INFIX2
     | T_INFIX3
@@ -39647,13 +40587,13 @@ fn yy_state_683(_lookahead : YYSymbol) -> YYDecision {
     | T_RANGE_INCLUSIVE_REV
     | T_RANGE_EXCLUSIVE_REV
     | T_IS
-    | T_LEXMATCH_QUESTION => Reduce(1, NT_qual_ident_simple_expr, yy_action_757)
+    | T_LEXMATCH_QUESTION => Reduce(1, NT_qual_ident_simple_expr, yy_action_769)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_684(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_692(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_multiline_string => Shift(yy_state_2)
     T_MULTILINE_INTERP => Shift(yy_state_4)
@@ -39708,42 +40648,42 @@ fn yy_state_684(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    T_POST_LABEL => Shift(yy_state_528)
-    NT_non_empty_tuple_elems_with_prefix => Shift(yy_state_625)
-    NT_arrow_fn_prefix_no_constraint => Shift(yy_state_626)
-    T_UNDERSCORE => Shift(yy_state_681)
-    T_LIDENT => Shift(yy_state_683)
-    T_RPAREN => Shift(yy_state_685)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_POST_LABEL => Shift(yy_state_530)
+    NT_non_empty_tuple_elems_with_prefix => Shift(yy_state_633)
+    NT_arrow_fn_prefix_no_constraint => Shift(yy_state_634)
+    T_UNDERSCORE => Shift(yy_state_689)
+    T_LIDENT => Shift(yy_state_691)
+    T_RPAREN => Shift(yy_state_693)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_685(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_arrow_fn_prefix_no_constraint, yy_action_489)
+fn yy_state_693(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(3, NT_arrow_fn_prefix_no_constraint, yy_action_499)
 }
 
 ///|
-fn yy_state_686(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_arrow_fn_prefix_no_constraint, yy_action_487)
+fn yy_state_694(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(2, NT_arrow_fn_prefix_no_constraint, yy_action_497)
 }
 
 ///|
-fn yy_state_687(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_695(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_QUESTION => Shift(yy_state_193)
-    T_FAT_ARROW => Shift(yy_state_531)
-    T_COMMA => Shift(yy_state_684)
-    T_RPAREN => Shift(yy_state_686)
-    T_COLON => Shift(yy_state_688)
+    T_FAT_ARROW => Shift(yy_state_533)
+    T_COMMA => Shift(yy_state_692)
+    T_RPAREN => Shift(yy_state_694)
+    T_COLON => Shift(yy_state_696)
     T_INFIX1
     | T_INFIX2
     | T_INFIX3
@@ -39770,13 +40710,13 @@ fn yy_state_687(_lookahead : YYSymbol) -> YYDecision {
     | T_RANGE_INCLUSIVE_REV
     | T_RANGE_EXCLUSIVE_REV
     | T_IS
-    | T_LEXMATCH_QUESTION => Reduce(1, NT_qual_ident_simple_expr, yy_action_757)
+    | T_LEXMATCH_QUESTION => Reduce(1, NT_qual_ident_simple_expr, yy_action_769)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_688(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_696(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -39785,52 +40725,52 @@ fn yy_state_688(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_type_ => Shift(yy_state_689)
+    NT_type_ => Shift(yy_state_697)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_689(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_697(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RPAREN => Shift(yy_state_690)
+    T_RPAREN => Shift(yy_state_698)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_690(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(5, NT_tuple_expr, yy_action_484)
+fn yy_state_698(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(5, NT_tuple_expr, yy_action_494)
 }
 
 ///|
-fn yy_state_691(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_prefix_expr, yy_action_462)
+fn yy_state_699(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(2, NT_prefix_expr, yy_action_472)
 }
 
 ///|
-fn yy_state_692(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_700(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RPAREN => Shift(yy_state_693)
+    T_RPAREN => Shift(yy_state_701)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_693(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(7, NT_simple_expr, yy_action_460)
+fn yy_state_701(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(7, NT_simple_expr, yy_action_470)
 }
 
 ///|
-fn yy_state_694(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_702(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LPAREN => Shift(yy_state_695)
+    T_LPAREN => Shift(yy_state_703)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_695(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_703(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_multiline_string => Shift(yy_state_2)
     T_MULTILINE_INTERP => Shift(yy_state_4)
@@ -39888,37 +40828,37 @@ fn yy_state_695(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    T_POST_LABEL => Shift(yy_state_639)
-    T_LIDENT => Shift(yy_state_642)
-    NT_list_commas_argument_ => Shift(yy_state_696)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
-    T_RPAREN => Reduce(0, NT_list_commas_argument_, yy_action_780)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_POST_LABEL => Shift(yy_state_647)
+    T_LIDENT => Shift(yy_state_650)
+    NT_list_commas_argument_ => Shift(yy_state_704)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
+    T_RPAREN => Reduce(0, NT_list_commas_argument_, yy_action_792)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_696(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_704(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RPAREN => Shift(yy_state_697)
+    T_RPAREN => Shift(yy_state_705)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_697(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(7, NT_simple_expr, yy_action_458)
+fn yy_state_705(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(7, NT_simple_expr, yy_action_468)
 }
 
 ///|
-fn yy_state_698(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_706(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_multiline_string => Shift(yy_state_2)
     T_MULTILINE_INTERP => Shift(yy_state_4)
@@ -39976,41 +40916,41 @@ fn yy_state_698(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    T_POST_LABEL => Shift(yy_state_639)
-    T_LIDENT => Shift(yy_state_642)
-    NT_list_commas_argument_ => Shift(yy_state_699)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
-    T_RPAREN => Reduce(0, NT_list_commas_argument_, yy_action_780)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_POST_LABEL => Shift(yy_state_647)
+    T_LIDENT => Shift(yy_state_650)
+    NT_list_commas_argument_ => Shift(yy_state_707)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
+    T_RPAREN => Reduce(0, NT_list_commas_argument_, yy_action_792)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_699(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_707(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RPAREN => Shift(yy_state_700)
+    T_RPAREN => Shift(yy_state_708)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_700(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(6, NT_simple_expr, yy_action_456)
+fn yy_state_708(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(6, NT_simple_expr, yy_action_466)
 }
 
 ///|
-fn yy_state_701(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_709(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_QUESTION => Shift(yy_state_663)
-    T_EXCLAMATION => Shift(yy_state_667)
-    T_LPAREN => Shift(yy_state_671)
+    T_QUESTION => Shift(yy_state_671)
+    T_EXCLAMATION => Shift(yy_state_675)
+    T_LPAREN => Shift(yy_state_679)
     T_INFIX1
     | T_INFIX2
     | T_INFIX3
@@ -40047,13 +40987,13 @@ fn yy_state_701(_lookahead : YYSymbol) -> YYDecision {
     | T_RANGE_EXCLUSIVE_REV
     | T_IS
     | T_AND
-    | T_LEXMATCH_QUESTION => Reduce(2, NT_simple_expr, yy_action_469)
+    | T_LEXMATCH_QUESTION => Reduce(2, NT_simple_expr, yy_action_479)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_702(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_710(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_multiline_string => Shift(yy_state_2)
     T_MULTILINE_INTERP => Shift(yy_state_4)
@@ -40107,44 +41047,44 @@ fn yy_state_702(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    T_POST_LABEL => Shift(yy_state_528)
-    T_LIDENT => Shift(yy_state_530)
-    NT_option_expr_ => Shift(yy_state_655)
-    NT_expr => Shift(yy_state_703)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
-    T_COLON => Reduce(0, NT_option_expr_, yy_action_509)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_POST_LABEL => Shift(yy_state_530)
+    T_LIDENT => Shift(yy_state_532)
+    NT_option_expr_ => Shift(yy_state_663)
+    NT_expr => Shift(yy_state_711)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
+    T_COLON => Reduce(0, NT_option_expr_, yy_action_522)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_703(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_711(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RBRACKET => Shift(yy_state_704)
-    T_COLON => Reduce(1, NT_option_expr_, yy_action_508)
+    T_RBRACKET => Shift(yy_state_712)
+    T_COLON => Reduce(1, NT_option_expr_, yy_action_521)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_704(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(4, NT_simple_expr, yy_action_473)
+fn yy_state_712(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(4, NT_simple_expr, yy_action_483)
 }
 
 ///|
-fn yy_state_705(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_parameter, yy_action_455)
+fn yy_state_713(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(3, NT_parameter, yy_action_465)
 }
 
 ///|
-fn yy_state_706(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_714(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -40153,22 +41093,22 @@ fn yy_state_706(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_type_ => Shift(yy_state_707)
+    NT_type_ => Shift(yy_state_715)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_707(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_715(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_EQUAL => Shift(yy_state_708)
-    T_RPAREN | T_COMMA => Reduce(3, NT_parameter, yy_action_452)
+    T_EQUAL => Shift(yy_state_716)
+    T_RPAREN | T_COMMA => Reduce(3, NT_parameter, yy_action_462)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_708(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_716(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_multiline_string => Shift(yy_state_2)
     T_MULTILINE_INTERP => Shift(yy_state_4)
@@ -40222,48 +41162,48 @@ fn yy_state_708(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    T_POST_LABEL => Shift(yy_state_528)
-    T_LIDENT => Shift(yy_state_530)
-    NT_expr => Shift(yy_state_709)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_POST_LABEL => Shift(yy_state_530)
+    T_LIDENT => Shift(yy_state_532)
+    NT_expr => Shift(yy_state_717)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_709(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(5, NT_parameter, yy_action_451)
+fn yy_state_717(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(5, NT_parameter, yy_action_461)
 }
 
 ///|
-fn yy_state_710(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_718(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_QUESTION => Shift(yy_state_711)
-    T_COLON => Shift(yy_state_718)
-    T_RPAREN | T_COMMA => Reduce(1, NT_parameter, yy_action_450)
+    T_QUESTION => Shift(yy_state_719)
+    T_COLON => Shift(yy_state_726)
+    T_RPAREN | T_COMMA => Reduce(1, NT_parameter, yy_action_460)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_711(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_719(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_712)
-    T_EQUAL => Shift(yy_state_716)
-    T_RPAREN | T_COMMA => Reduce(2, NT_parameter, yy_action_449)
+    T_COLON => Shift(yy_state_720)
+    T_EQUAL => Shift(yy_state_724)
+    T_RPAREN | T_COMMA => Reduce(2, NT_parameter, yy_action_459)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_712(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_720(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -40272,22 +41212,22 @@ fn yy_state_712(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_type_ => Shift(yy_state_713)
+    NT_type_ => Shift(yy_state_721)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_713(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_721(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_EQUAL => Shift(yy_state_714)
-    T_RPAREN | T_COMMA => Reduce(4, NT_parameter, yy_action_448)
+    T_EQUAL => Shift(yy_state_722)
+    T_RPAREN | T_COMMA => Reduce(4, NT_parameter, yy_action_458)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_714(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_722(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_multiline_string => Shift(yy_state_2)
     T_MULTILINE_INTERP => Shift(yy_state_4)
@@ -40341,28 +41281,28 @@ fn yy_state_714(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    T_POST_LABEL => Shift(yy_state_528)
-    T_LIDENT => Shift(yy_state_530)
-    NT_expr => Shift(yy_state_715)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_POST_LABEL => Shift(yy_state_530)
+    T_LIDENT => Shift(yy_state_532)
+    NT_expr => Shift(yy_state_723)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_715(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(6, NT_parameter, yy_action_447)
+fn yy_state_723(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(6, NT_parameter, yy_action_457)
 }
 
 ///|
-fn yy_state_716(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_724(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_multiline_string => Shift(yy_state_2)
     T_MULTILINE_INTERP => Shift(yy_state_4)
@@ -40416,28 +41356,28 @@ fn yy_state_716(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    T_POST_LABEL => Shift(yy_state_528)
-    T_LIDENT => Shift(yy_state_530)
-    NT_expr => Shift(yy_state_717)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_POST_LABEL => Shift(yy_state_530)
+    T_LIDENT => Shift(yy_state_532)
+    NT_expr => Shift(yy_state_725)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_717(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(4, NT_parameter, yy_action_446)
+fn yy_state_725(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(4, NT_parameter, yy_action_456)
 }
 
 ///|
-fn yy_state_718(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_726(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -40446,27 +41386,27 @@ fn yy_state_718(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_type_ => Shift(yy_state_719)
+    NT_type_ => Shift(yy_state_727)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_719(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_parameter, yy_action_445)
+fn yy_state_727(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(3, NT_parameter, yy_action_455)
 }
 
 ///|
-fn yy_state_720(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_728(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_721)
-    T_RPAREN | T_COMMA => Reduce(1, NT_parameter, yy_action_444)
+    T_COLON => Shift(yy_state_729)
+    T_RPAREN | T_COMMA => Reduce(1, NT_parameter, yy_action_454)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_721(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_729(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -40475,50 +41415,50 @@ fn yy_state_721(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_type_ => Shift(yy_state_722)
+    NT_type_ => Shift(yy_state_730)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_722(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_parameter, yy_action_443)
+fn yy_state_730(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(3, NT_parameter, yy_action_453)
 }
 
 ///|
-fn yy_state_723(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_list_commas_parameter_, yy_action_442)
+fn yy_state_731(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_list_commas_parameter_, yy_action_452)
 }
 
 ///|
-fn yy_state_724(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_732(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RPAREN => Shift(yy_state_725)
+    T_RPAREN => Shift(yy_state_733)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_725(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_parameters, yy_action_440)
+fn yy_state_733(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(3, NT_parameters, yy_action_450)
 }
 
 ///|
-fn yy_state_726(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_optional_bang, yy_action_439)
+fn yy_state_734(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_optional_bang, yy_action_449)
 }
 
 ///|
-fn yy_state_727(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_735(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(
     1,
     NT_list_commas_with_trailing_info_record_defn_single_,
-    yy_action_438,
+    yy_action_448,
   )
 }
 
 ///|
-fn yy_state_728(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_736(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_multiline_string => Shift(yy_state_2)
     T_MULTILINE_INTERP => Shift(yy_state_4)
@@ -40572,100 +41512,100 @@ fn yy_state_728(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    T_POST_LABEL => Shift(yy_state_528)
-    T_LIDENT => Shift(yy_state_530)
-    NT_expr => Shift(yy_state_729)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_POST_LABEL => Shift(yy_state_530)
+    T_LIDENT => Shift(yy_state_532)
+    NT_expr => Shift(yy_state_737)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_729(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_737(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COMMA => Shift(yy_state_730)
-    T_RBRACE => Shift(yy_state_736)
+    T_COMMA => Shift(yy_state_738)
+    T_RBRACE => Shift(yy_state_744)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_730(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_738(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_record_defn_single => Shift(yy_state_134)
     T_LIDENT => Shift(yy_state_139)
-    NT_non_empty_list_commas_rev_record_defn_single_ => Shift(yy_state_731)
-    NT_non_empty_list_commas_record_defn_single_ => Shift(yy_state_733)
-    NT_list_commas_record_defn_single_ => Shift(yy_state_734)
-    T_RBRACE => Reduce(0, NT_list_commas_record_defn_single_, yy_action_437)
+    NT_non_empty_list_commas_rev_record_defn_single_ => Shift(yy_state_739)
+    NT_non_empty_list_commas_record_defn_single_ => Shift(yy_state_741)
+    NT_list_commas_record_defn_single_ => Shift(yy_state_742)
+    T_RBRACE => Reduce(0, NT_list_commas_record_defn_single_, yy_action_447)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_731(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_739(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_COMMA => Shift(yy_state_137)
-    NT_option_COMMA_ => Shift(yy_state_732)
-    T_RBRACE => Reduce(0, NT_option_COMMA_, yy_action_865)
+    NT_option_COMMA_ => Shift(yy_state_740)
+    T_RBRACE => Reduce(0, NT_option_COMMA_, yy_action_877)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_732(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_740(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(
     2,
     NT_non_empty_list_commas_record_defn_single_,
-    yy_action_436,
+    yy_action_446,
   )
 }
 
 ///|
-fn yy_state_733(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_list_commas_record_defn_single_, yy_action_435)
+fn yy_state_741(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_list_commas_record_defn_single_, yy_action_445)
 }
 
 ///|
-fn yy_state_734(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_742(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RBRACE => Shift(yy_state_735)
+    T_RBRACE => Shift(yy_state_743)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_735(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(8, NT_simple_expr, yy_action_433)
+fn yy_state_743(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(8, NT_simple_expr, yy_action_443)
 }
 
 ///|
-fn yy_state_736(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(6, NT_simple_expr, yy_action_431)
+fn yy_state_744(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(6, NT_simple_expr, yy_action_441)
 }
 
 ///|
-fn yy_state_737(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_745(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RBRACE => Shift(yy_state_738)
+    T_RBRACE => Shift(yy_state_746)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_738(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(5, NT_simple_expr, yy_action_430)
+fn yy_state_746(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(5, NT_simple_expr, yy_action_440)
 }
 
 ///|
-fn yy_state_739(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_747(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_multiline_string => Shift(yy_state_2)
     T_MULTILINE_INTERP => Shift(yy_state_4)
@@ -40706,13 +41646,13 @@ fn yy_state_739(_lookahead : YYSymbol) -> YYDecision {
     NT_prefix_expr => Shift(yy_state_198)
     NT_range_expr => Shift(yy_state_209)
     NT_postfix_expr => Shift(yy_state_382)
-    NT_infix_expr => Shift(yy_state_740)
+    NT_infix_expr => Shift(yy_state_748)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_740(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_748(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_BARBAR => Shift(yy_state_384)
     T_AMPERAMPER => Shift(yy_state_386)
@@ -40725,33 +41665,33 @@ fn yy_state_740(_lookahead : YYSymbol) -> YYDecision {
     T_INFIX2 => Shift(yy_state_400)
     T_INFIX3 => Shift(yy_state_402)
     T_INFIX4 => Shift(yy_state_404)
-    T_ELSE => Shift(yy_state_741)
-    T_SEMI | T_RBRACE => Reduce(2, NT_guard_statement, yy_action_429)
+    T_ELSE => Shift(yy_state_749)
+    T_SEMI | T_RBRACE => Reduce(2, NT_guard_statement, yy_action_439)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_741(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_749(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LBRACE => Shift(yy_state_124)
-    NT_block_expr => Shift(yy_state_742)
+    NT_block_expr => Shift(yy_state_750)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_742(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(4, NT_guard_statement, yy_action_428)
+fn yy_state_750(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(4, NT_guard_statement, yy_action_438)
 }
 
 ///|
-fn yy_state_743(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_statement, yy_action_427)
+fn yy_state_751(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_statement, yy_action_437)
 }
 
 ///|
-fn yy_state_744(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_752(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_multiline_string => Shift(yy_state_2)
     T_MULTILINE_INTERP => Shift(yy_state_4)
@@ -40793,166 +41733,166 @@ fn yy_state_744(_lookahead : YYSymbol) -> YYDecision {
     NT_range_expr => Shift(yy_state_209)
     NT_postfix_expr => Shift(yy_state_382)
     NT_infix_expr => Shift(yy_state_383)
-    NT_pipe_expr => Shift(yy_state_745)
+    NT_pipe_expr => Shift(yy_state_753)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_745(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_753(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_PIPE => Shift(yy_state_448)
-    T_SEMI | T_RBRACE => Reduce(2, NT_statement, yy_action_426)
+    T_SEMI | T_RBRACE => Reduce(2, NT_statement, yy_action_436)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_746(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_statement, yy_action_425)
+fn yy_state_754(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_statement, yy_action_435)
 }
 
 ///|
-fn yy_state_747(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_755(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_optional_bang => Shift(yy_state_48)
-    T_EXCLAMATION => Shift(yy_state_726)
-    T_LIDENT => Shift(yy_state_748)
-    T_LPAREN => Reduce(0, NT_optional_bang, yy_action_851)
+    T_EXCLAMATION => Shift(yy_state_734)
+    T_LIDENT => Shift(yy_state_756)
+    T_LPAREN => Reduce(0, NT_optional_bang, yy_action_863)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_748(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_756(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_EXCLAMATION => Shift(yy_state_726)
-    NT_optional_bang => Shift(yy_state_749)
-    T_LPAREN => Reduce(0, NT_optional_bang, yy_action_851)
+    T_EXCLAMATION => Shift(yy_state_734)
+    NT_optional_bang => Shift(yy_state_757)
+    T_LPAREN => Reduce(0, NT_optional_bang, yy_action_863)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_749(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_757(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LPAREN => Shift(yy_state_148)
-    NT_parameters => Shift(yy_state_750)
+    NT_parameters => Shift(yy_state_758)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_750(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_758(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_error_annotation => Shift(yy_state_50)
     T_THIN_ARROW => Shift(yy_state_51)
     T_NORAISE => Shift(yy_state_83)
     T_RAISE => Shift(yy_state_84)
-    NT_func_return_type => Shift(yy_state_751)
-    T_LBRACE => Reduce(0, NT_func_return_type, yy_action_850)
+    NT_func_return_type => Shift(yy_state_759)
+    T_LBRACE => Reduce(0, NT_func_return_type, yy_action_862)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_751(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_759(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LBRACE => Shift(yy_state_124)
-    NT_block_expr => Shift(yy_state_752)
+    NT_block_expr => Shift(yy_state_760)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_752(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(6, NT_statement, yy_action_424)
+fn yy_state_760(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(6, NT_statement, yy_action_434)
 }
 
 ///|
-fn yy_state_753(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_761(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_FN => Shift(yy_state_754)
+    T_FN => Shift(yy_state_762)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_754(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_762(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_optional_bang => Shift(yy_state_144)
-    T_EXCLAMATION => Shift(yy_state_726)
-    T_LIDENT => Shift(yy_state_755)
-    T_LPAREN => Reduce(0, NT_optional_bang, yy_action_851)
+    T_EXCLAMATION => Shift(yy_state_734)
+    T_LIDENT => Shift(yy_state_763)
+    T_LPAREN => Reduce(0, NT_optional_bang, yy_action_863)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_755(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_763(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_EXCLAMATION => Shift(yy_state_726)
-    NT_optional_bang => Shift(yy_state_756)
-    T_LPAREN => Reduce(0, NT_optional_bang, yy_action_851)
+    T_EXCLAMATION => Shift(yy_state_734)
+    NT_optional_bang => Shift(yy_state_764)
+    T_LPAREN => Reduce(0, NT_optional_bang, yy_action_863)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_756(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_764(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LPAREN => Shift(yy_state_148)
-    NT_parameters => Shift(yy_state_757)
+    NT_parameters => Shift(yy_state_765)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_757(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_765(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_error_annotation => Shift(yy_state_50)
     T_THIN_ARROW => Shift(yy_state_51)
     T_NORAISE => Shift(yy_state_83)
     T_RAISE => Shift(yy_state_84)
-    NT_func_return_type => Shift(yy_state_758)
-    T_LBRACE => Reduce(0, NT_func_return_type, yy_action_850)
+    NT_func_return_type => Shift(yy_state_766)
+    T_LBRACE => Reduce(0, NT_func_return_type, yy_action_862)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_758(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_766(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LBRACE => Shift(yy_state_124)
-    NT_block_expr => Shift(yy_state_759)
+    NT_block_expr => Shift(yy_state_767)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_759(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(7, NT_statement, yy_action_423)
+fn yy_state_767(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(7, NT_statement, yy_action_433)
 }
 
 ///|
-fn yy_state_760(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_768(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LIDENT => Shift(yy_state_761)
+    T_LIDENT => Shift(yy_state_769)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_761(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_769(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_762)
-    T_EQUAL => Shift(yy_state_783)
+    T_COLON => Shift(yy_state_770)
+    T_EQUAL => Shift(yy_state_791)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_762(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_770(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -40961,36 +41901,36 @@ fn yy_state_762(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_type_ => Shift(yy_state_763)
+    NT_type_ => Shift(yy_state_771)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_763(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_771(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_EQUAL => Shift(yy_state_764)
+    T_EQUAL => Shift(yy_state_772)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_764(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_772(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_FN => Shift(yy_state_47)
     T_ASYNC => Shift(yy_state_142)
-    T_UNDERSCORE => Shift(yy_state_765)
-    T_LIDENT => Shift(yy_state_766)
-    T_LPAREN => Shift(yy_state_767)
-    NT_letand_func => Shift(yy_state_769)
-    NT_anony_fn => Shift(yy_state_778)
-    NT_arrow_fn_expr => Shift(yy_state_779)
+    T_UNDERSCORE => Shift(yy_state_773)
+    T_LIDENT => Shift(yy_state_774)
+    T_LPAREN => Shift(yy_state_775)
+    NT_letand_func => Shift(yy_state_777)
+    NT_anony_fn => Shift(yy_state_786)
+    NT_arrow_fn_expr => Shift(yy_state_787)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_765(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_773(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_FAT_ARROW => Shift(yy_state_407)
     _ => Error
@@ -40998,78 +41938,78 @@ fn yy_state_765(_lookahead : YYSymbol) -> YYDecision {
 }
 
 ///|
-fn yy_state_766(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_774(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_FAT_ARROW => Shift(yy_state_531)
+    T_FAT_ARROW => Shift(yy_state_533)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_767(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_775(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_UNDERSCORE => Shift(yy_state_421)
     T_LIDENT => Shift(yy_state_428)
-    NT_arrow_fn_prefix => Shift(yy_state_632)
-    T_RPAREN => Shift(yy_state_768)
+    NT_arrow_fn_prefix => Shift(yy_state_640)
+    T_RPAREN => Shift(yy_state_776)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_768(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_776(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_FAT_ARROW => Shift(yy_state_630)
+    T_FAT_ARROW => Shift(yy_state_638)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_769(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_777(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_and_func => Shift(yy_state_770)
-    T_AND => Shift(yy_state_772)
-    NT_list_and_func_ => Shift(yy_state_782)
-    T_SEMI | T_RBRACE => Reduce(0, NT_list_and_func_, yy_action_422)
+    NT_and_func => Shift(yy_state_778)
+    T_AND => Shift(yy_state_780)
+    NT_list_and_func_ => Shift(yy_state_790)
+    T_SEMI | T_RBRACE => Reduce(0, NT_list_and_func_, yy_action_432)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_770(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_778(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_and_func => Shift(yy_state_770)
-    NT_list_and_func_ => Shift(yy_state_771)
-    T_AND => Shift(yy_state_772)
-    T_SEMI | T_RBRACE => Reduce(0, NT_list_and_func_, yy_action_422)
+    NT_and_func => Shift(yy_state_778)
+    NT_list_and_func_ => Shift(yy_state_779)
+    T_AND => Shift(yy_state_780)
+    T_SEMI | T_RBRACE => Reduce(0, NT_list_and_func_, yy_action_432)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_771(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_list_and_func_, yy_action_421)
+fn yy_state_779(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(2, NT_list_and_func_, yy_action_431)
 }
 
 ///|
-fn yy_state_772(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_780(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LIDENT => Shift(yy_state_773)
+    T_LIDENT => Shift(yy_state_781)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_773(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_781(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_774)
-    T_EQUAL => Shift(yy_state_780)
+    T_COLON => Shift(yy_state_782)
+    T_EQUAL => Shift(yy_state_788)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_774(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_782(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -41078,107 +42018,107 @@ fn yy_state_774(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_type_ => Shift(yy_state_775)
+    NT_type_ => Shift(yy_state_783)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_775(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_783(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_EQUAL => Shift(yy_state_776)
+    T_EQUAL => Shift(yy_state_784)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_776(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_784(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_FN => Shift(yy_state_47)
     T_ASYNC => Shift(yy_state_142)
-    T_UNDERSCORE => Shift(yy_state_765)
-    T_LIDENT => Shift(yy_state_766)
-    T_LPAREN => Shift(yy_state_767)
-    NT_letand_func => Shift(yy_state_777)
-    NT_anony_fn => Shift(yy_state_778)
-    NT_arrow_fn_expr => Shift(yy_state_779)
+    T_UNDERSCORE => Shift(yy_state_773)
+    T_LIDENT => Shift(yy_state_774)
+    T_LPAREN => Shift(yy_state_775)
+    NT_letand_func => Shift(yy_state_785)
+    NT_anony_fn => Shift(yy_state_786)
+    NT_arrow_fn_expr => Shift(yy_state_787)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_777(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(6, NT_and_func, yy_action_420)
+fn yy_state_785(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(6, NT_and_func, yy_action_430)
 }
 
 ///|
-fn yy_state_778(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_letand_func, yy_action_419)
+fn yy_state_786(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_letand_func, yy_action_429)
 }
 
 ///|
-fn yy_state_779(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_letand_func, yy_action_418)
+fn yy_state_787(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_letand_func, yy_action_428)
 }
 
 ///|
-fn yy_state_780(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_788(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_FN => Shift(yy_state_47)
     T_ASYNC => Shift(yy_state_142)
-    T_UNDERSCORE => Shift(yy_state_765)
-    T_LIDENT => Shift(yy_state_766)
-    T_LPAREN => Shift(yy_state_767)
-    NT_anony_fn => Shift(yy_state_778)
-    NT_arrow_fn_expr => Shift(yy_state_779)
-    NT_letand_func => Shift(yy_state_781)
+    T_UNDERSCORE => Shift(yy_state_773)
+    T_LIDENT => Shift(yy_state_774)
+    T_LPAREN => Shift(yy_state_775)
+    NT_anony_fn => Shift(yy_state_786)
+    NT_arrow_fn_expr => Shift(yy_state_787)
+    NT_letand_func => Shift(yy_state_789)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_781(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(4, NT_and_func, yy_action_417)
+fn yy_state_789(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(4, NT_and_func, yy_action_427)
 }
 
 ///|
-fn yy_state_782(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(7, NT_statement, yy_action_416)
+fn yy_state_790(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(7, NT_statement, yy_action_426)
 }
 
 ///|
-fn yy_state_783(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_791(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_FN => Shift(yy_state_47)
     T_ASYNC => Shift(yy_state_142)
-    T_UNDERSCORE => Shift(yy_state_765)
-    T_LIDENT => Shift(yy_state_766)
-    T_LPAREN => Shift(yy_state_767)
-    NT_anony_fn => Shift(yy_state_778)
-    NT_arrow_fn_expr => Shift(yy_state_779)
-    NT_letand_func => Shift(yy_state_784)
+    T_UNDERSCORE => Shift(yy_state_773)
+    T_LIDENT => Shift(yy_state_774)
+    T_LPAREN => Shift(yy_state_775)
+    NT_anony_fn => Shift(yy_state_786)
+    NT_arrow_fn_expr => Shift(yy_state_787)
+    NT_letand_func => Shift(yy_state_792)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_784(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_792(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_and_func => Shift(yy_state_770)
-    T_AND => Shift(yy_state_772)
-    NT_list_and_func_ => Shift(yy_state_785)
-    T_SEMI | T_RBRACE => Reduce(0, NT_list_and_func_, yy_action_422)
+    NT_and_func => Shift(yy_state_778)
+    T_AND => Shift(yy_state_780)
+    NT_list_and_func_ => Shift(yy_state_793)
+    T_SEMI | T_RBRACE => Reduce(0, NT_list_and_func_, yy_action_432)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_785(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(5, NT_statement, yy_action_415)
+fn yy_state_793(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(5, NT_statement, yy_action_425)
 }
 
 ///|
-fn yy_state_786(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_794(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_AMPER => Shift(yy_state_18)
     NT_qual_ident_ty => Shift(yy_state_24)
@@ -41204,31 +42144,31 @@ fn yy_state_786(_lookahead : YYSymbol) -> YYDecision {
     T_PACKAGE_NAME => Shift(yy_state_300)
     NT_range_pattern => Shift(yy_state_303)
     NT_or_pattern => Shift(yy_state_306)
-    T_MUTABLE => Shift(yy_state_787)
-    NT_pattern => Shift(yy_state_795)
+    T_MUTABLE => Shift(yy_state_795)
+    NT_pattern => Shift(yy_state_803)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_787(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_795(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LIDENT => Shift(yy_state_788)
+    T_LIDENT => Shift(yy_state_796)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_788(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_796(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_789)
-    T_EQUAL => Shift(yy_state_793)
+    T_COLON => Shift(yy_state_797)
+    T_EQUAL => Shift(yy_state_801)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_789(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_797(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -41237,21 +42177,21 @@ fn yy_state_789(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_type_ => Shift(yy_state_790)
+    NT_type_ => Shift(yy_state_798)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_790(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_798(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_EQUAL => Shift(yy_state_791)
+    T_EQUAL => Shift(yy_state_799)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_791(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_799(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_multiline_string => Shift(yy_state_2)
     T_MULTILINE_INTERP => Shift(yy_state_4)
@@ -41305,28 +42245,28 @@ fn yy_state_791(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    T_POST_LABEL => Shift(yy_state_528)
-    T_LIDENT => Shift(yy_state_530)
-    NT_expr => Shift(yy_state_792)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_POST_LABEL => Shift(yy_state_530)
+    T_LIDENT => Shift(yy_state_532)
+    NT_expr => Shift(yy_state_800)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_792(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(7, NT_statement, yy_action_414)
+fn yy_state_800(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(7, NT_statement, yy_action_424)
 }
 
 ///|
-fn yy_state_793(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_801(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_multiline_string => Shift(yy_state_2)
     T_MULTILINE_INTERP => Shift(yy_state_4)
@@ -41380,38 +42320,38 @@ fn yy_state_793(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    T_POST_LABEL => Shift(yy_state_528)
-    T_LIDENT => Shift(yy_state_530)
-    NT_expr => Shift(yy_state_794)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_POST_LABEL => Shift(yy_state_530)
+    T_LIDENT => Shift(yy_state_532)
+    NT_expr => Shift(yy_state_802)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_794(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(5, NT_statement, yy_action_413)
+fn yy_state_802(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(5, NT_statement, yy_action_423)
 }
 
 ///|
-fn yy_state_795(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_803(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_AS => Shift(yy_state_308)
-    T_COLON => Shift(yy_state_796)
-    T_EQUAL => Shift(yy_state_800)
+    T_COLON => Shift(yy_state_804)
+    T_EQUAL => Shift(yy_state_808)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_796(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_804(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -41420,21 +42360,21 @@ fn yy_state_796(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_type_ => Shift(yy_state_797)
+    NT_type_ => Shift(yy_state_805)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_797(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_805(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_EQUAL => Shift(yy_state_798)
+    T_EQUAL => Shift(yy_state_806)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_798(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_806(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_multiline_string => Shift(yy_state_2)
     T_MULTILINE_INTERP => Shift(yy_state_4)
@@ -41488,28 +42428,28 @@ fn yy_state_798(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    T_POST_LABEL => Shift(yy_state_528)
-    T_LIDENT => Shift(yy_state_530)
-    NT_expr => Shift(yy_state_799)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_POST_LABEL => Shift(yy_state_530)
+    T_LIDENT => Shift(yy_state_532)
+    NT_expr => Shift(yy_state_807)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_799(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(6, NT_statement, yy_action_412)
+fn yy_state_807(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(6, NT_statement, yy_action_422)
 }
 
 ///|
-fn yy_state_800(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_808(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_multiline_string => Shift(yy_state_2)
     T_MULTILINE_INTERP => Shift(yy_state_4)
@@ -41563,70 +42503,70 @@ fn yy_state_800(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    T_POST_LABEL => Shift(yy_state_528)
-    T_LIDENT => Shift(yy_state_530)
-    NT_expr => Shift(yy_state_801)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_POST_LABEL => Shift(yy_state_530)
+    T_LIDENT => Shift(yy_state_532)
+    NT_expr => Shift(yy_state_809)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_801(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(4, NT_statement, yy_action_411)
+fn yy_state_809(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(4, NT_statement, yy_action_421)
 }
 
 ///|
-fn yy_state_802(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_list_semis_rev_statement_, yy_action_410)
+fn yy_state_810(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_list_semis_rev_statement_, yy_action_420)
 }
 
 ///|
-fn yy_state_803(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_811(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RBRACE => Shift(yy_state_804)
+    T_RBRACE => Shift(yy_state_812)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_804(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_block_expr, yy_action_409)
+fn yy_state_812(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(3, NT_block_expr, yy_action_419)
 }
 
 ///|
-fn yy_state_805(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_list_commas_map_expr_elem_, yy_action_408)
+fn yy_state_813(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_list_commas_map_expr_elem_, yy_action_418)
 }
 
 ///|
-fn yy_state_806(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_814(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_SEMI => Shift(yy_state_128)
-    NT_option_SEMI_ => Shift(yy_state_807)
-    T_RBRACE => Reduce(0, NT_option_SEMI_, yy_action_800)
+    NT_option_SEMI_ => Shift(yy_state_815)
+    T_RBRACE => Reduce(0, NT_option_SEMI_, yy_action_812)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_807(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_815(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(
     2,
     NT_none_empty_list_semis_rev_with_trailing_info_statement_,
-    yy_action_407,
+    yy_action_417,
   )
 }
 
 ///|
-fn yy_state_808(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_816(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_INFIX1
     | T_INFIX2
@@ -41657,40 +42597,40 @@ fn yy_state_808(_lookahead : YYSymbol) -> YYDecision {
     | T_RANGE_INCLUSIVE_REV
     | T_RANGE_EXCLUSIVE_REV
     | T_IS
-    | T_LEXMATCH_QUESTION => Reduce(1, NT_atomic_expr, yy_action_874)
-    T_COLON => Reduce(1, NT_map_syntax_key, yy_action_654)
+    | T_LEXMATCH_QUESTION => Reduce(1, NT_atomic_expr, yy_action_886)
+    T_COLON => Reduce(1, NT_map_syntax_key, yy_action_666)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_809(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_817(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RBRACE => Shift(yy_state_810)
+    T_RBRACE => Shift(yy_state_818)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_810(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_simple_expr, yy_action_406)
+fn yy_state_818(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(3, NT_simple_expr, yy_action_416)
 }
 
 ///|
-fn yy_state_811(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_819(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RBRACE => Shift(yy_state_812)
+    T_RBRACE => Shift(yy_state_820)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_812(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_simple_expr, yy_action_404)
+fn yy_state_820(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(3, NT_simple_expr, yy_action_414)
 }
 
 ///|
-fn yy_state_813(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_821(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_multiline_string => Shift(yy_state_2)
     T_MULTILINE_INTERP => Shift(yy_state_4)
@@ -41744,76 +42684,76 @@ fn yy_state_813(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    T_POST_LABEL => Shift(yy_state_528)
-    T_LIDENT => Shift(yy_state_530)
-    NT_expr => Shift(yy_state_814)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_POST_LABEL => Shift(yy_state_530)
+    T_LIDENT => Shift(yy_state_532)
+    NT_expr => Shift(yy_state_822)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_814(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_822(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COMMA => Shift(yy_state_815)
-    T_RBRACE => Shift(yy_state_818)
+    T_COMMA => Shift(yy_state_823)
+    T_RBRACE => Shift(yy_state_826)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_815(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_823(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_record_defn_single => Shift(yy_state_134)
     T_LIDENT => Shift(yy_state_139)
-    NT_non_empty_list_commas_rev_record_defn_single_ => Shift(yy_state_731)
-    NT_non_empty_list_commas_record_defn_single_ => Shift(yy_state_733)
-    NT_list_commas_record_defn_single_ => Shift(yy_state_816)
-    T_RBRACE => Reduce(0, NT_list_commas_record_defn_single_, yy_action_437)
+    NT_non_empty_list_commas_rev_record_defn_single_ => Shift(yy_state_739)
+    NT_non_empty_list_commas_record_defn_single_ => Shift(yy_state_741)
+    NT_list_commas_record_defn_single_ => Shift(yy_state_824)
+    T_RBRACE => Reduce(0, NT_list_commas_record_defn_single_, yy_action_447)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_816(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_824(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RBRACE => Shift(yy_state_817)
+    T_RBRACE => Shift(yy_state_825)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_817(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(6, NT_simple_expr, yy_action_403)
+fn yy_state_825(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(6, NT_simple_expr, yy_action_413)
 }
 
 ///|
-fn yy_state_818(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(4, NT_simple_expr, yy_action_401)
+fn yy_state_826(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(4, NT_simple_expr, yy_action_411)
 }
 
 ///|
-fn yy_state_819(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_827(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RBRACE => Shift(yy_state_820)
+    T_RBRACE => Shift(yy_state_828)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_820(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_simple_expr, yy_action_400)
+fn yy_state_828(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(3, NT_simple_expr, yy_action_410)
 }
 
 ///|
-fn yy_state_821(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_829(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_multiline_string => Shift(yy_state_2)
     T_MULTILINE_INTERP => Shift(yy_state_4)
@@ -41849,15 +42789,15 @@ fn yy_state_821(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_188)
     T_PACKAGE_NAME => Shift(yy_state_189)
     T_LIDENT => Shift(yy_state_192)
-    T_FLOAT => Shift(yy_state_822)
-    T_DOUBLE => Shift(yy_state_823)
-    T_INT => Shift(yy_state_824)
+    T_FLOAT => Shift(yy_state_830)
+    T_DOUBLE => Shift(yy_state_831)
+    T_INT => Shift(yy_state_832)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_822(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_830(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_INFIX1
     | T_INFIX2
@@ -41888,14 +42828,14 @@ fn yy_state_822(_lookahead : YYSymbol) -> YYDecision {
     | T_RANGE_INCLUSIVE_REV
     | T_RANGE_EXCLUSIVE_REV
     | T_IS
-    | T_LEXMATCH_QUESTION => Reduce(1, NT_simple_constant, yy_action_884)
-    T_COLON => Reduce(2, NT_map_syntax_key, yy_action_657)
+    | T_LEXMATCH_QUESTION => Reduce(1, NT_simple_constant, yy_action_896)
+    T_COLON => Reduce(2, NT_map_syntax_key, yy_action_669)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_823(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_831(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_INFIX1
     | T_INFIX2
@@ -41926,14 +42866,14 @@ fn yy_state_823(_lookahead : YYSymbol) -> YYDecision {
     | T_RANGE_INCLUSIVE_REV
     | T_RANGE_EXCLUSIVE_REV
     | T_IS
-    | T_LEXMATCH_QUESTION => Reduce(1, NT_simple_constant, yy_action_883)
-    T_COLON => Reduce(2, NT_map_syntax_key, yy_action_656)
+    | T_LEXMATCH_QUESTION => Reduce(1, NT_simple_constant, yy_action_895)
+    T_COLON => Reduce(2, NT_map_syntax_key, yy_action_668)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_824(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_832(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_INFIX1
     | T_INFIX2
@@ -41964,20 +42904,20 @@ fn yy_state_824(_lookahead : YYSymbol) -> YYDecision {
     | T_RANGE_INCLUSIVE_REV
     | T_RANGE_EXCLUSIVE_REV
     | T_IS
-    | T_LEXMATCH_QUESTION => Reduce(1, NT_simple_constant, yy_action_882)
-    T_COLON => Reduce(2, NT_map_syntax_key, yy_action_655)
+    | T_LEXMATCH_QUESTION => Reduce(1, NT_simple_constant, yy_action_894)
+    T_COLON => Reduce(2, NT_map_syntax_key, yy_action_667)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_825(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_833(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_QUESTION => Shift(yy_state_193)
-    T_FAT_ARROW => Shift(yy_state_531)
-    T_COLON => Shift(yy_state_826)
-    T_COMMA => Shift(yy_state_831)
-    T_AUGMENTED_ASSIGNMENT | T_EQUAL => Reduce(1, NT_qual_ident, yy_action_536)
+    T_FAT_ARROW => Shift(yy_state_533)
+    T_COLON => Shift(yy_state_834)
+    T_COMMA => Shift(yy_state_839)
+    T_AUGMENTED_ASSIGNMENT | T_EQUAL => Reduce(1, NT_qual_ident, yy_action_549)
     T_INFIX1
     | T_INFIX2
     | T_INFIX3
@@ -42006,13 +42946,13 @@ fn yy_state_825(_lookahead : YYSymbol) -> YYDecision {
     | T_RANGE_INCLUSIVE_REV
     | T_RANGE_EXCLUSIVE_REV
     | T_IS
-    | T_LEXMATCH_QUESTION => Reduce(1, NT_qual_ident_simple_expr, yy_action_757)
+    | T_LEXMATCH_QUESTION => Reduce(1, NT_qual_ident_simple_expr, yy_action_769)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_826(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_834(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_multiline_string => Shift(yy_state_2)
     T_MULTILINE_INTERP => Shift(yy_state_4)
@@ -42066,228 +43006,228 @@ fn yy_state_826(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    T_POST_LABEL => Shift(yy_state_528)
-    T_LIDENT => Shift(yy_state_530)
-    NT_expr => Shift(yy_state_827)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_POST_LABEL => Shift(yy_state_530)
+    T_LIDENT => Shift(yy_state_532)
+    NT_expr => Shift(yy_state_835)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_827(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_835(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COMMA => Shift(yy_state_828)
-    NT_option_COMMA_ => Shift(yy_state_830)
-    T_RBRACE => Reduce(0, NT_option_COMMA_, yy_action_865)
+    T_COMMA => Shift(yy_state_836)
+    NT_option_COMMA_ => Shift(yy_state_838)
+    T_RBRACE => Reduce(0, NT_option_COMMA_, yy_action_877)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_828(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_836(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_record_defn_single => Shift(yy_state_134)
     NT_non_empty_list_commas_rev_record_defn_single_ => Shift(yy_state_135)
     T_LIDENT => Shift(yy_state_139)
     NT_non_empty_list_commas_with_trailing_info_record_defn_single_ =>
-      Shift(yy_state_829)
-    T_RBRACE => Reduce(1, NT_option_COMMA_, yy_action_863)
+      Shift(yy_state_837)
+    T_RBRACE => Reduce(1, NT_option_COMMA_, yy_action_875)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_829(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(5, NT_record_defn, yy_action_399)
+fn yy_state_837(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(5, NT_record_defn, yy_action_409)
 }
 
 ///|
-fn yy_state_830(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(4, NT_record_defn, yy_action_397)
+fn yy_state_838(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(4, NT_record_defn, yy_action_407)
 }
 
 ///|
-fn yy_state_831(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_839(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_record_defn_single => Shift(yy_state_134)
     NT_non_empty_list_commas_rev_record_defn_single_ => Shift(yy_state_135)
     T_LIDENT => Shift(yy_state_139)
     NT_non_empty_list_commas_with_trailing_info_record_defn_single_ =>
-      Shift(yy_state_727)
-    NT_list_commas_with_trailing_info_record_defn_single_ => Shift(yy_state_832)
+      Shift(yy_state_735)
+    NT_list_commas_with_trailing_info_record_defn_single_ => Shift(yy_state_840)
     T_RBRACE =>
       Reduce(
         0,
         NT_list_commas_with_trailing_info_record_defn_single_,
-        yy_action_795,
+        yy_action_807,
       )
     _ => Error
   }
 }
 
 ///|
-fn yy_state_832(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_record_defn, yy_action_395)
+fn yy_state_840(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(3, NT_record_defn, yy_action_405)
 }
 
 ///|
-fn yy_state_833(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_spreadable_elem, yy_action_394)
+fn yy_state_841(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_spreadable_elem, yy_action_404)
 }
 
 ///|
-fn yy_state_834(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_list_commas_spreadable_elem_, yy_action_393)
+fn yy_state_842(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_list_commas_spreadable_elem_, yy_action_403)
 }
 
 ///|
-fn yy_state_835(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_843(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RBRACKET => Shift(yy_state_836)
+    T_RBRACKET => Shift(yy_state_844)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_836(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_simple_expr, yy_action_392)
+fn yy_state_844(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(3, NT_simple_expr, yy_action_402)
 }
 
 ///|
-fn yy_state_837(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_845(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_EOF => Shift(yy_state_838)
+    T_EOF => Shift(yy_state_846)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_838(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_expression, yy_action_391)
+fn yy_state_846(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(2, NT_expression, yy_action_401)
 }
 
 ///|
-fn yy_state_839(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_847(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_structure => Shift(yy_state_840)
-    NT_structure_item => Shift(yy_state_841)
-    T_ATTRIBUTE => Shift(yy_state_845)
-    T_ENUM => Shift(yy_state_847)
-    T_STRUCT => Shift(yy_state_861)
-    T_SUBERROR => Shift(yy_state_864)
-    T_TYPE => Shift(yy_state_866)
-    T_USING => Shift(yy_state_869)
-    T_ENUMVIEW => Shift(yy_state_894)
-    T_IMPL => Shift(yy_state_951)
-    T_TEST => Shift(yy_state_1053)
-    T_TRAITALIAS => Shift(yy_state_1059)
-    T_TYPEALIAS => Shift(yy_state_1078)
-    T_TRAIT => Shift(yy_state_1087)
-    T_FNALIAS => Shift(yy_state_1154)
-    NT_declare_fun_header => Shift(yy_state_1191)
-    NT_fun_header => Shift(yy_state_1192)
-    NT_extern_fun_header => Shift(yy_state_1200)
-    NT_val_header => Shift(yy_state_1205)
-    NT_enum_header => Shift(yy_state_1208)
-    NT_struct_header => Shift(yy_state_1213)
-    NT_suberror_header => Shift(yy_state_1222)
-    NT_type_header => Shift(yy_state_1230)
-    T_CONST => Shift(yy_state_1237)
-    T_LET => Shift(yy_state_1241)
-    T_EXTERN => Shift(yy_state_1245)
-    T_FN => Shift(yy_state_1261)
-    T_DECLARE => Shift(yy_state_1268)
-    NT_non_empty_list_attribute_ => Shift(yy_state_1365)
-    T_PUB => Shift(yy_state_1738)
-    T_PRIV => Shift(yy_state_1828)
-    NT_fun_header_generic => Shift(yy_state_1917)
-    T_ASYNC => Shift(yy_state_1920)
-    NT_non_empty_list_semis_structure_item_ => Shift(yy_state_1928)
-    NT_list_semis_structure_item_ => Shift(yy_state_1929)
-    T_EOF => Reduce(0, NT_list_semis_structure_item_, yy_action_390)
+    NT_structure => Shift(yy_state_848)
+    NT_structure_item => Shift(yy_state_849)
+    T_ATTRIBUTE => Shift(yy_state_853)
+    T_ENUM => Shift(yy_state_855)
+    T_STRUCT => Shift(yy_state_869)
+    T_SUBERROR => Shift(yy_state_872)
+    T_TYPE => Shift(yy_state_874)
+    T_USING => Shift(yy_state_877)
+    T_ENUMVIEW => Shift(yy_state_902)
+    T_IMPL => Shift(yy_state_959)
+    T_TEST => Shift(yy_state_1061)
+    T_TRAITALIAS => Shift(yy_state_1067)
+    T_TYPEALIAS => Shift(yy_state_1086)
+    T_TRAIT => Shift(yy_state_1095)
+    T_FNALIAS => Shift(yy_state_1162)
+    NT_declare_fun_header => Shift(yy_state_1199)
+    NT_fun_header => Shift(yy_state_1200)
+    NT_extern_fun_header => Shift(yy_state_1208)
+    NT_val_header => Shift(yy_state_1213)
+    NT_enum_header => Shift(yy_state_1216)
+    NT_struct_header => Shift(yy_state_1221)
+    NT_suberror_header => Shift(yy_state_1270)
+    NT_type_header => Shift(yy_state_1278)
+    T_CONST => Shift(yy_state_1285)
+    T_LET => Shift(yy_state_1289)
+    T_EXTERN => Shift(yy_state_1293)
+    T_FN => Shift(yy_state_1309)
+    T_DECLARE => Shift(yy_state_1316)
+    NT_non_empty_list_attribute_ => Shift(yy_state_1413)
+    T_PUB => Shift(yy_state_1786)
+    T_PRIV => Shift(yy_state_1876)
+    NT_fun_header_generic => Shift(yy_state_1965)
+    T_ASYNC => Shift(yy_state_1968)
+    NT_non_empty_list_semis_structure_item_ => Shift(yy_state_1976)
+    NT_list_semis_structure_item_ => Shift(yy_state_1977)
+    T_EOF => Reduce(0, NT_list_semis_structure_item_, yy_action_400)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_840(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_848(_lookahead : YYSymbol) -> YYDecision {
   Accept
 }
 
 ///|
-fn yy_state_841(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_849(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_option_SEMI_ => Shift(yy_state_842)
-    T_SEMI => Shift(yy_state_843)
-    T_EOF => Reduce(0, NT_option_SEMI_, yy_action_800)
+    NT_option_SEMI_ => Shift(yy_state_850)
+    T_SEMI => Shift(yy_state_851)
+    T_EOF => Reduce(0, NT_option_SEMI_, yy_action_812)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_842(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_non_empty_list_semis_structure_item_, yy_action_389)
+fn yy_state_850(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(2, NT_non_empty_list_semis_structure_item_, yy_action_399)
 }
 
 ///|
-fn yy_state_843(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_851(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_structure_item => Shift(yy_state_841)
-    NT_non_empty_list_semis_structure_item_ => Shift(yy_state_844)
-    T_ATTRIBUTE => Shift(yy_state_845)
-    T_ENUM => Shift(yy_state_847)
-    T_STRUCT => Shift(yy_state_861)
-    T_SUBERROR => Shift(yy_state_864)
-    T_TYPE => Shift(yy_state_866)
-    T_USING => Shift(yy_state_869)
-    T_ENUMVIEW => Shift(yy_state_894)
-    T_IMPL => Shift(yy_state_951)
-    T_TEST => Shift(yy_state_1053)
-    T_TRAITALIAS => Shift(yy_state_1059)
-    T_TYPEALIAS => Shift(yy_state_1078)
-    T_TRAIT => Shift(yy_state_1087)
-    T_FNALIAS => Shift(yy_state_1154)
-    NT_declare_fun_header => Shift(yy_state_1191)
-    NT_fun_header => Shift(yy_state_1192)
-    NT_extern_fun_header => Shift(yy_state_1200)
-    NT_val_header => Shift(yy_state_1205)
-    NT_enum_header => Shift(yy_state_1208)
-    NT_struct_header => Shift(yy_state_1213)
-    NT_suberror_header => Shift(yy_state_1222)
-    NT_type_header => Shift(yy_state_1230)
-    T_CONST => Shift(yy_state_1237)
-    T_LET => Shift(yy_state_1241)
-    T_EXTERN => Shift(yy_state_1245)
-    T_FN => Shift(yy_state_1261)
-    T_DECLARE => Shift(yy_state_1268)
-    NT_non_empty_list_attribute_ => Shift(yy_state_1365)
-    T_PUB => Shift(yy_state_1738)
-    T_PRIV => Shift(yy_state_1828)
-    NT_fun_header_generic => Shift(yy_state_1917)
-    T_ASYNC => Shift(yy_state_1920)
-    T_EOF => Reduce(1, NT_option_SEMI_, yy_action_798)
+    NT_structure_item => Shift(yy_state_849)
+    NT_non_empty_list_semis_structure_item_ => Shift(yy_state_852)
+    T_ATTRIBUTE => Shift(yy_state_853)
+    T_ENUM => Shift(yy_state_855)
+    T_STRUCT => Shift(yy_state_869)
+    T_SUBERROR => Shift(yy_state_872)
+    T_TYPE => Shift(yy_state_874)
+    T_USING => Shift(yy_state_877)
+    T_ENUMVIEW => Shift(yy_state_902)
+    T_IMPL => Shift(yy_state_959)
+    T_TEST => Shift(yy_state_1061)
+    T_TRAITALIAS => Shift(yy_state_1067)
+    T_TYPEALIAS => Shift(yy_state_1086)
+    T_TRAIT => Shift(yy_state_1095)
+    T_FNALIAS => Shift(yy_state_1162)
+    NT_declare_fun_header => Shift(yy_state_1199)
+    NT_fun_header => Shift(yy_state_1200)
+    NT_extern_fun_header => Shift(yy_state_1208)
+    NT_val_header => Shift(yy_state_1213)
+    NT_enum_header => Shift(yy_state_1216)
+    NT_struct_header => Shift(yy_state_1221)
+    NT_suberror_header => Shift(yy_state_1270)
+    NT_type_header => Shift(yy_state_1278)
+    T_CONST => Shift(yy_state_1285)
+    T_LET => Shift(yy_state_1289)
+    T_EXTERN => Shift(yy_state_1293)
+    T_FN => Shift(yy_state_1309)
+    T_DECLARE => Shift(yy_state_1316)
+    NT_non_empty_list_attribute_ => Shift(yy_state_1413)
+    T_PUB => Shift(yy_state_1786)
+    T_PRIV => Shift(yy_state_1876)
+    NT_fun_header_generic => Shift(yy_state_1965)
+    T_ASYNC => Shift(yy_state_1968)
+    T_EOF => Reduce(1, NT_option_SEMI_, yy_action_810)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_844(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_non_empty_list_semis_structure_item_, yy_action_388)
+fn yy_state_852(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(3, NT_non_empty_list_semis_structure_item_, yy_action_398)
 }
 
 ///|
-fn yy_state_845(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_853(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_ATTRIBUTE => Shift(yy_state_845)
-    NT_non_empty_list_attribute_ => Shift(yy_state_846)
+    T_ATTRIBUTE => Shift(yy_state_853)
+    NT_non_empty_list_attribute_ => Shift(yy_state_854)
     T_LIDENT
     | T_UIDENT
     | T_PUB
@@ -42310,200 +43250,200 @@ fn yy_state_845(_lookahead : YYSymbol) -> YYDecision {
     | T_TEST
     | T_SUBERROR
     | T_ENUMVIEW
-    | T_DECLARE => Reduce(1, NT_non_empty_list_attribute_, yy_action_387)
+    | T_DECLARE => Reduce(1, NT_non_empty_list_attribute_, yy_action_397)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_846(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_non_empty_list_attribute_, yy_action_385)
+fn yy_state_854(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(2, NT_non_empty_list_attribute_, yy_action_395)
 }
 
 ///|
-fn yy_state_847(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_855(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_848)
+    T_UIDENT => Shift(yy_state_856)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_848(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_856(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACKET => Shift(yy_state_849)
-    NT_optional_type_parameters_no_constraints => Shift(yy_state_859)
+    T_LBRACKET => Shift(yy_state_857)
+    NT_optional_type_parameters_no_constraints => Shift(yy_state_867)
     NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__ =>
-      Shift(yy_state_860)
+      Shift(yy_state_868)
     T_LBRACE =>
       Reduce(
         0,
         NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__,
-        yy_action_384,
+        yy_action_394,
       )
     _ => Error
   }
 }
 
 ///|
-fn yy_state_849(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_857(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_type_decl_binder => Shift(yy_state_850)
-    NT_non_empty_list_commas_id_type_decl_binder__ => Shift(yy_state_851)
-    NT_non_empty_list_commas_rev_id_type_decl_binder__ => Shift(yy_state_853)
-    T_UNDERSCORE => Shift(yy_state_856)
-    T_UIDENT => Shift(yy_state_857)
+    NT_type_decl_binder => Shift(yy_state_858)
+    NT_non_empty_list_commas_id_type_decl_binder__ => Shift(yy_state_859)
+    NT_non_empty_list_commas_rev_id_type_decl_binder__ => Shift(yy_state_861)
+    T_UNDERSCORE => Shift(yy_state_864)
+    T_UIDENT => Shift(yy_state_865)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_850(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_858(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(
     1,
     NT_non_empty_list_commas_rev_id_type_decl_binder__,
-    yy_action_383,
+    yy_action_393,
   )
 }
 
 ///|
-fn yy_state_851(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_859(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RBRACKET => Shift(yy_state_852)
+    T_RBRACKET => Shift(yy_state_860)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_852(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_860(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(
     3,
     NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__,
-    yy_action_381,
+    yy_action_391,
   )
 }
 
 ///|
-fn yy_state_853(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_861(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COMMA => Shift(yy_state_854)
-    NT_option_COMMA_ => Shift(yy_state_858)
-    T_RBRACKET => Reduce(0, NT_option_COMMA_, yy_action_865)
+    T_COMMA => Shift(yy_state_862)
+    NT_option_COMMA_ => Shift(yy_state_866)
+    T_RBRACKET => Reduce(0, NT_option_COMMA_, yy_action_877)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_854(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_862(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_type_decl_binder => Shift(yy_state_855)
-    T_UNDERSCORE => Shift(yy_state_856)
-    T_UIDENT => Shift(yy_state_857)
-    T_RBRACKET => Reduce(1, NT_option_COMMA_, yy_action_863)
+    NT_type_decl_binder => Shift(yy_state_863)
+    T_UNDERSCORE => Shift(yy_state_864)
+    T_UIDENT => Shift(yy_state_865)
+    T_RBRACKET => Reduce(1, NT_option_COMMA_, yy_action_875)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_855(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_863(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(
     3,
     NT_non_empty_list_commas_rev_id_type_decl_binder__,
-    yy_action_379,
+    yy_action_389,
   )
 }
 
 ///|
-fn yy_state_856(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_type_decl_binder, yy_action_378)
+fn yy_state_864(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_type_decl_binder, yy_action_388)
 }
 
 ///|
-fn yy_state_857(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_type_decl_binder, yy_action_377)
+fn yy_state_865(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_type_decl_binder, yy_action_387)
 }
 
 ///|
-fn yy_state_858(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_866(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(
     2,
     NT_non_empty_list_commas_id_type_decl_binder__,
-    yy_action_376,
+    yy_action_386,
   )
 }
 
 ///|
-fn yy_state_859(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_enum_header, yy_action_375)
+fn yy_state_867(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(3, NT_enum_header, yy_action_385)
 }
 
 ///|
-fn yy_state_860(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_868(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(
     1,
     NT_optional_type_parameters_no_constraints,
-    yy_action_374,
+    yy_action_384,
   )
 }
 
 ///|
-fn yy_state_861(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_869(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_862)
+    T_UIDENT => Shift(yy_state_870)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_862(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_870(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACKET => Shift(yy_state_849)
+    T_LBRACKET => Shift(yy_state_857)
     NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__ =>
-      Shift(yy_state_860)
-    NT_optional_type_parameters_no_constraints => Shift(yy_state_863)
+      Shift(yy_state_868)
+    NT_optional_type_parameters_no_constraints => Shift(yy_state_871)
     T_LPAREN | T_LBRACE =>
       Reduce(
         0,
         NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__,
-        yy_action_384,
+        yy_action_394,
       )
     _ => Error
   }
 }
 
 ///|
-fn yy_state_863(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_struct_header, yy_action_373)
+fn yy_state_871(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(3, NT_struct_header, yy_action_383)
 }
 
 ///|
-fn yy_state_864(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_872(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_865)
+    T_UIDENT => Shift(yy_state_873)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_865(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_suberror_header, yy_action_372)
+fn yy_state_873(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(2, NT_suberror_header, yy_action_382)
 }
 
 ///|
-fn yy_state_866(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_874(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_867)
+    T_UIDENT => Shift(yy_state_875)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_867(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_875(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACKET => Shift(yy_state_849)
+    T_LBRACKET => Shift(yy_state_857)
     NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__ =>
-      Shift(yy_state_860)
-    NT_optional_type_parameters_no_constraints => Shift(yy_state_868)
+      Shift(yy_state_868)
+    NT_optional_type_parameters_no_constraints => Shift(yy_state_876)
     T_UIDENT
     | T_EOF
     | T_DERIVE
@@ -42517,419 +43457,419 @@ fn yy_state_867(_lookahead : YYSymbol) -> YYDecision {
       Reduce(
         0,
         NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__,
-        yy_action_384,
+        yy_action_394,
       )
     _ => Error
   }
 }
 
 ///|
-fn yy_state_868(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_type_header, yy_action_371)
+fn yy_state_876(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(3, NT_type_header, yy_action_381)
 }
 
 ///|
-fn yy_state_869(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_877(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_PACKAGE_NAME => Shift(yy_state_870)
+    T_PACKAGE_NAME => Shift(yy_state_878)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_870(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_878(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACE => Shift(yy_state_871)
+    T_LBRACE => Shift(yy_state_879)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_871(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_879(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_using_binder => Shift(yy_state_872)
-    NT_non_empty_list_commas_rev_using_binder_ => Shift(yy_state_873)
-    T_TRAIT => Shift(yy_state_877)
-    T_TYPE => Shift(yy_state_881)
-    T_UIDENT => Shift(yy_state_885)
-    T_LIDENT => Shift(yy_state_888)
-    NT_non_empty_list_commas_using_binder_ => Shift(yy_state_891)
-    NT_list_commas_using_binder_ => Shift(yy_state_892)
-    T_RBRACE => Reduce(0, NT_list_commas_using_binder_, yy_action_370)
+    NT_using_binder => Shift(yy_state_880)
+    NT_non_empty_list_commas_rev_using_binder_ => Shift(yy_state_881)
+    T_TRAIT => Shift(yy_state_885)
+    T_TYPE => Shift(yy_state_889)
+    T_UIDENT => Shift(yy_state_893)
+    T_LIDENT => Shift(yy_state_896)
+    NT_non_empty_list_commas_using_binder_ => Shift(yy_state_899)
+    NT_list_commas_using_binder_ => Shift(yy_state_900)
+    T_RBRACE => Reduce(0, NT_list_commas_using_binder_, yy_action_380)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_872(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_880(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(
     1,
     NT_non_empty_list_commas_rev_using_binder_,
-    yy_action_369,
+    yy_action_379,
   )
 }
 
 ///|
-fn yy_state_873(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_881(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_option_COMMA_ => Shift(yy_state_874)
-    T_COMMA => Shift(yy_state_875)
-    T_RBRACE => Reduce(0, NT_option_COMMA_, yy_action_865)
+    NT_option_COMMA_ => Shift(yy_state_882)
+    T_COMMA => Shift(yy_state_883)
+    T_RBRACE => Reduce(0, NT_option_COMMA_, yy_action_877)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_874(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_non_empty_list_commas_using_binder_, yy_action_368)
+fn yy_state_882(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(2, NT_non_empty_list_commas_using_binder_, yy_action_378)
 }
 
 ///|
-fn yy_state_875(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_883(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_using_binder => Shift(yy_state_876)
-    T_TRAIT => Shift(yy_state_877)
-    T_TYPE => Shift(yy_state_881)
-    T_UIDENT => Shift(yy_state_885)
-    T_LIDENT => Shift(yy_state_888)
-    T_RBRACE => Reduce(1, NT_option_COMMA_, yy_action_863)
+    NT_using_binder => Shift(yy_state_884)
+    T_TRAIT => Shift(yy_state_885)
+    T_TYPE => Shift(yy_state_889)
+    T_UIDENT => Shift(yy_state_893)
+    T_LIDENT => Shift(yy_state_896)
+    T_RBRACE => Reduce(1, NT_option_COMMA_, yy_action_875)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_876(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_884(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(
     3,
     NT_non_empty_list_commas_rev_using_binder_,
-    yy_action_367,
+    yy_action_377,
   )
 }
 
 ///|
-fn yy_state_877(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_885(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_878)
+    T_UIDENT => Shift(yy_state_886)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_878(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_886(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_AS => Shift(yy_state_879)
-    T_COMMA | T_RBRACE => Reduce(2, NT_using_binder, yy_action_366)
+    T_AS => Shift(yy_state_887)
+    T_COMMA | T_RBRACE => Reduce(2, NT_using_binder, yy_action_376)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_879(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_887(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_880)
+    T_UIDENT => Shift(yy_state_888)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_880(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(4, NT_using_binder, yy_action_365)
+fn yy_state_888(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(4, NT_using_binder, yy_action_375)
 }
 
 ///|
-fn yy_state_881(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_889(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_882)
+    T_UIDENT => Shift(yy_state_890)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_882(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_890(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_AS => Shift(yy_state_883)
-    T_COMMA | T_RBRACE => Reduce(2, NT_using_binder, yy_action_364)
+    T_AS => Shift(yy_state_891)
+    T_COMMA | T_RBRACE => Reduce(2, NT_using_binder, yy_action_374)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_883(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_891(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_884)
+    T_UIDENT => Shift(yy_state_892)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_884(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(4, NT_using_binder, yy_action_363)
+fn yy_state_892(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(4, NT_using_binder, yy_action_373)
 }
 
 ///|
-fn yy_state_885(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_893(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_AS => Shift(yy_state_886)
-    T_COMMA | T_RBRACE => Reduce(1, NT_using_binder, yy_action_362)
+    T_AS => Shift(yy_state_894)
+    T_COMMA | T_RBRACE => Reduce(1, NT_using_binder, yy_action_372)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_886(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_894(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_887)
+    T_UIDENT => Shift(yy_state_895)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_887(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_using_binder, yy_action_361)
+fn yy_state_895(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(3, NT_using_binder, yy_action_371)
 }
 
 ///|
-fn yy_state_888(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_896(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_AS => Shift(yy_state_889)
-    T_COMMA | T_RBRACE => Reduce(1, NT_using_binder, yy_action_360)
+    T_AS => Shift(yy_state_897)
+    T_COMMA | T_RBRACE => Reduce(1, NT_using_binder, yy_action_370)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_889(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_897(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LIDENT => Shift(yy_state_890)
+    T_LIDENT => Shift(yy_state_898)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_890(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_using_binder, yy_action_359)
+fn yy_state_898(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(3, NT_using_binder, yy_action_369)
 }
 
 ///|
-fn yy_state_891(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_list_commas_using_binder_, yy_action_358)
+fn yy_state_899(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_list_commas_using_binder_, yy_action_368)
 }
 
 ///|
-fn yy_state_892(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_900(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RBRACE => Shift(yy_state_893)
+    T_RBRACE => Shift(yy_state_901)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_893(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(5, NT_structure_item, yy_action_357)
+fn yy_state_901(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(5, NT_structure_item, yy_action_367)
 }
 
 ///|
-fn yy_state_894(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_902(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_type_parameters => Shift(yy_state_895)
-    NT_optional_type_parameters => Shift(yy_state_896)
-    NT_option_type_parameters_ => Shift(yy_state_935)
-    T_LBRACKET => Shift(yy_state_936)
-    T_UIDENT => Reduce(0, NT_option_type_parameters_, yy_action_356)
+    NT_type_parameters => Shift(yy_state_903)
+    NT_optional_type_parameters => Shift(yy_state_904)
+    NT_option_type_parameters_ => Shift(yy_state_943)
+    T_LBRACKET => Shift(yy_state_944)
+    T_UIDENT => Reduce(0, NT_option_type_parameters_, yy_action_366)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_895(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_option_type_parameters_, yy_action_355)
+fn yy_state_903(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_option_type_parameters_, yy_action_365)
 }
 
 ///|
-fn yy_state_896(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_904(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_897)
+    T_UIDENT => Shift(yy_state_905)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_897(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_905(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACE => Shift(yy_state_898)
+    T_LBRACE => Shift(yy_state_906)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_898(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_906(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_ATTRIBUTE => Shift(yy_state_845)
-    NT_enum_constructor => Shift(yy_state_899)
-    NT_non_empty_list_attribute_ => Shift(yy_state_903)
-    T_UIDENT => Shift(yy_state_923)
-    NT_non_empty_list_semis_enum_constructor_ => Shift(yy_state_926)
-    NT_list_semis_enum_constructor_ => Shift(yy_state_927)
-    T_RBRACE => Reduce(0, NT_list_semis_enum_constructor_, yy_action_354)
+    T_ATTRIBUTE => Shift(yy_state_853)
+    NT_enum_constructor => Shift(yy_state_907)
+    NT_non_empty_list_attribute_ => Shift(yy_state_911)
+    T_UIDENT => Shift(yy_state_931)
+    NT_non_empty_list_semis_enum_constructor_ => Shift(yy_state_934)
+    NT_list_semis_enum_constructor_ => Shift(yy_state_935)
+    T_RBRACE => Reduce(0, NT_list_semis_enum_constructor_, yy_action_364)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_899(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_907(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_option_SEMI_ => Shift(yy_state_900)
-    T_SEMI => Shift(yy_state_901)
-    T_RBRACE => Reduce(0, NT_option_SEMI_, yy_action_800)
+    NT_option_SEMI_ => Shift(yy_state_908)
+    T_SEMI => Shift(yy_state_909)
+    T_RBRACE => Reduce(0, NT_option_SEMI_, yy_action_812)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_900(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_non_empty_list_semis_enum_constructor_, yy_action_353)
+fn yy_state_908(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(2, NT_non_empty_list_semis_enum_constructor_, yy_action_363)
 }
 
 ///|
-fn yy_state_901(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_909(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_ATTRIBUTE => Shift(yy_state_845)
-    NT_enum_constructor => Shift(yy_state_899)
-    NT_non_empty_list_semis_enum_constructor_ => Shift(yy_state_902)
-    NT_non_empty_list_attribute_ => Shift(yy_state_903)
-    T_UIDENT => Shift(yy_state_923)
-    T_RBRACE => Reduce(1, NT_option_SEMI_, yy_action_798)
+    T_ATTRIBUTE => Shift(yy_state_853)
+    NT_enum_constructor => Shift(yy_state_907)
+    NT_non_empty_list_semis_enum_constructor_ => Shift(yy_state_910)
+    NT_non_empty_list_attribute_ => Shift(yy_state_911)
+    T_UIDENT => Shift(yy_state_931)
+    T_RBRACE => Reduce(1, NT_option_SEMI_, yy_action_810)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_902(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_non_empty_list_semis_enum_constructor_, yy_action_352)
+fn yy_state_910(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(3, NT_non_empty_list_semis_enum_constructor_, yy_action_362)
 }
 
 ///|
-fn yy_state_903(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_911(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_904)
+    T_UIDENT => Shift(yy_state_912)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_904(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_912(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LPAREN => Shift(yy_state_905)
+    T_LPAREN => Shift(yy_state_913)
     NT_option_delimited_LPAREN_non_empty_list_commas_constructor_param__RPAREN__ =>
-      Shift(yy_state_919)
+      Shift(yy_state_927)
     T_EQUAL | T_SEMI | T_RBRACE =>
       Reduce(
         0,
         NT_option_delimited_LPAREN_non_empty_list_commas_constructor_param__RPAREN__,
-        yy_action_351,
+        yy_action_361,
       )
     _ => Error
   }
 }
 
 ///|
-fn yy_state_905(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_913(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_constructor_param => Shift(yy_state_906)
-    NT_non_empty_list_commas_constructor_param_ => Shift(yy_state_907)
-    NT_non_empty_list_commas_rev_constructor_param_ => Shift(yy_state_909)
-    T_MUTABLE => Shift(yy_state_913)
-    NT_option_MUTABLE_ => Shift(yy_state_914)
+    NT_constructor_param => Shift(yy_state_914)
+    NT_non_empty_list_commas_constructor_param_ => Shift(yy_state_915)
+    NT_non_empty_list_commas_rev_constructor_param_ => Shift(yy_state_917)
+    T_MUTABLE => Shift(yy_state_921)
+    NT_option_MUTABLE_ => Shift(yy_state_922)
     T_UIDENT
     | T_POST_LABEL
     | T_ASYNC
     | T_LPAREN
     | T_UNDERSCORE
     | T_AMPER
-    | T_PACKAGE_NAME => Reduce(0, NT_option_MUTABLE_, yy_action_350)
+    | T_PACKAGE_NAME => Reduce(0, NT_option_MUTABLE_, yy_action_360)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_906(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_914(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(
     1,
     NT_non_empty_list_commas_rev_constructor_param_,
-    yy_action_349,
+    yy_action_359,
   )
 }
 
 ///|
-fn yy_state_907(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_915(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RPAREN => Shift(yy_state_908)
+    T_RPAREN => Shift(yy_state_916)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_908(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_916(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(
     3,
     NT_option_delimited_LPAREN_non_empty_list_commas_constructor_param__RPAREN__,
-    yy_action_347,
+    yy_action_357,
   )
 }
 
 ///|
-fn yy_state_909(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_917(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_option_COMMA_ => Shift(yy_state_910)
-    T_COMMA => Shift(yy_state_911)
-    T_RPAREN => Reduce(0, NT_option_COMMA_, yy_action_865)
+    NT_option_COMMA_ => Shift(yy_state_918)
+    T_COMMA => Shift(yy_state_919)
+    T_RPAREN => Reduce(0, NT_option_COMMA_, yy_action_877)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_910(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_918(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(
     2,
     NT_non_empty_list_commas_constructor_param_,
-    yy_action_346,
+    yy_action_356,
   )
 }
 
 ///|
-fn yy_state_911(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_919(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_constructor_param => Shift(yy_state_912)
-    T_MUTABLE => Shift(yy_state_913)
-    NT_option_MUTABLE_ => Shift(yy_state_914)
+    NT_constructor_param => Shift(yy_state_920)
+    T_MUTABLE => Shift(yy_state_921)
+    NT_option_MUTABLE_ => Shift(yy_state_922)
     T_UIDENT
     | T_POST_LABEL
     | T_ASYNC
     | T_LPAREN
     | T_UNDERSCORE
     | T_AMPER
-    | T_PACKAGE_NAME => Reduce(0, NT_option_MUTABLE_, yy_action_350)
-    T_RPAREN => Reduce(1, NT_option_COMMA_, yy_action_863)
+    | T_PACKAGE_NAME => Reduce(0, NT_option_MUTABLE_, yy_action_360)
+    T_RPAREN => Reduce(1, NT_option_COMMA_, yy_action_875)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_912(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_920(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(
     3,
     NT_non_empty_list_commas_rev_constructor_param_,
-    yy_action_345,
+    yy_action_355,
   )
 }
 
 ///|
-fn yy_state_913(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_option_MUTABLE_, yy_action_344)
+fn yy_state_921(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_option_MUTABLE_, yy_action_354)
 }
 
 ///|
-fn yy_state_914(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_922(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -42938,22 +43878,22 @@ fn yy_state_914(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    T_POST_LABEL => Shift(yy_state_915)
-    NT_type_ => Shift(yy_state_918)
+    T_POST_LABEL => Shift(yy_state_923)
+    NT_type_ => Shift(yy_state_926)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_915(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_923(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_916)
+    T_COLON => Shift(yy_state_924)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_916(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_924(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -42962,89 +43902,27 @@ fn yy_state_916(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_type_ => Shift(yy_state_917)
-    _ => Error
-  }
-}
-
-///|
-fn yy_state_917(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(4, NT_constructor_param, yy_action_343)
-}
-
-///|
-fn yy_state_918(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_constructor_param, yy_action_342)
-}
-
-///|
-fn yy_state_919(_lookahead : YYSymbol) -> YYDecision {
-  match _lookahead {
-    T_EQUAL => Shift(yy_state_920)
-    NT_option_eq_int_tag_ => Shift(yy_state_922)
-    T_SEMI | T_RBRACE => Reduce(0, NT_option_eq_int_tag_, yy_action_341)
-    _ => Error
-  }
-}
-
-///|
-fn yy_state_920(_lookahead : YYSymbol) -> YYDecision {
-  match _lookahead {
-    T_INT => Shift(yy_state_921)
-    _ => Error
-  }
-}
-
-///|
-fn yy_state_921(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_option_eq_int_tag_, yy_action_339)
-}
-
-///|
-fn yy_state_922(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(4, NT_enum_constructor, yy_action_338)
-}
-
-///|
-fn yy_state_923(_lookahead : YYSymbol) -> YYDecision {
-  match _lookahead {
-    T_LPAREN => Shift(yy_state_905)
-    NT_option_delimited_LPAREN_non_empty_list_commas_constructor_param__RPAREN__ =>
-      Shift(yy_state_924)
-    T_EQUAL | T_SEMI | T_RBRACE =>
-      Reduce(
-        0,
-        NT_option_delimited_LPAREN_non_empty_list_commas_constructor_param__RPAREN__,
-        yy_action_351,
-      )
-    _ => Error
-  }
-}
-
-///|
-fn yy_state_924(_lookahead : YYSymbol) -> YYDecision {
-  match _lookahead {
-    T_EQUAL => Shift(yy_state_920)
-    NT_option_eq_int_tag_ => Shift(yy_state_925)
-    T_SEMI | T_RBRACE => Reduce(0, NT_option_eq_int_tag_, yy_action_341)
+    NT_type_ => Shift(yy_state_925)
     _ => Error
   }
 }
 
 ///|
 fn yy_state_925(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_enum_constructor, yy_action_337)
+  ReduceNoLookahead(4, NT_constructor_param, yy_action_353)
 }
 
 ///|
 fn yy_state_926(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_list_semis_enum_constructor_, yy_action_336)
+  ReduceNoLookahead(2, NT_constructor_param, yy_action_352)
 }
 
 ///|
 fn yy_state_927(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RBRACE => Shift(yy_state_928)
+    T_EQUAL => Shift(yy_state_928)
+    NT_option_eq_int_tag_ => Shift(yy_state_930)
+    T_SEMI | T_RBRACE => Reduce(0, NT_option_eq_int_tag_, yy_action_351)
     _ => Error
   }
 }
@@ -43052,13 +43930,75 @@ fn yy_state_927(_lookahead : YYSymbol) -> YYDecision {
 ///|
 fn yy_state_928(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_FOR => Shift(yy_state_929)
+    T_INT => Shift(yy_state_929)
     _ => Error
   }
 }
 
 ///|
 fn yy_state_929(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(2, NT_option_eq_int_tag_, yy_action_349)
+}
+
+///|
+fn yy_state_930(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(4, NT_enum_constructor, yy_action_348)
+}
+
+///|
+fn yy_state_931(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_LPAREN => Shift(yy_state_913)
+    NT_option_delimited_LPAREN_non_empty_list_commas_constructor_param__RPAREN__ =>
+      Shift(yy_state_932)
+    T_EQUAL | T_SEMI | T_RBRACE =>
+      Reduce(
+        0,
+        NT_option_delimited_LPAREN_non_empty_list_commas_constructor_param__RPAREN__,
+        yy_action_361,
+      )
+    _ => Error
+  }
+}
+
+///|
+fn yy_state_932(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_EQUAL => Shift(yy_state_928)
+    NT_option_eq_int_tag_ => Shift(yy_state_933)
+    T_SEMI | T_RBRACE => Reduce(0, NT_option_eq_int_tag_, yy_action_351)
+    _ => Error
+  }
+}
+
+///|
+fn yy_state_933(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(3, NT_enum_constructor, yy_action_347)
+}
+
+///|
+fn yy_state_934(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_list_semis_enum_constructor_, yy_action_346)
+}
+
+///|
+fn yy_state_935(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_RBRACE => Shift(yy_state_936)
+    _ => Error
+  }
+}
+
+///|
+fn yy_state_936(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_FOR => Shift(yy_state_937)
+    _ => Error
+  }
+}
+
+///|
+fn yy_state_937(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -43067,294 +44007,294 @@ fn yy_state_929(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_type_ => Shift(yy_state_930)
+    NT_type_ => Shift(yy_state_938)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_930(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_938(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_WITH => Shift(yy_state_931)
+    T_WITH => Shift(yy_state_939)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_931(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_939(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LIDENT => Shift(yy_state_932)
+    T_LIDENT => Shift(yy_state_940)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_932(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_940(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LPAREN => Shift(yy_state_148)
-    NT_parameters => Shift(yy_state_933)
+    NT_parameters => Shift(yy_state_941)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_933(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_941(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LBRACE => Shift(yy_state_124)
-    NT_block_expr => Shift(yy_state_934)
+    NT_block_expr => Shift(yy_state_942)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_934(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(12, NT_structure_item, yy_action_335)
+fn yy_state_942(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(12, NT_structure_item, yy_action_345)
 }
 
 ///|
-fn yy_state_935(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_optional_type_parameters, yy_action_334)
+fn yy_state_943(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_optional_type_parameters, yy_action_344)
 }
 
 ///|
-fn yy_state_936(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_944(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_tvar_binder => Shift(yy_state_937)
-    NT_non_empty_list_commas_rev_id_tvar_binder__ => Shift(yy_state_938)
-    T_UIDENT => Shift(yy_state_941)
-    NT_non_empty_list_commas_id_tvar_binder__ => Shift(yy_state_949)
+    NT_tvar_binder => Shift(yy_state_945)
+    NT_non_empty_list_commas_rev_id_tvar_binder__ => Shift(yy_state_946)
+    T_UIDENT => Shift(yy_state_949)
+    NT_non_empty_list_commas_id_tvar_binder__ => Shift(yy_state_957)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_937(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_945(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(
     1,
     NT_non_empty_list_commas_rev_id_tvar_binder__,
-    yy_action_333,
+    yy_action_343,
   )
 }
 
 ///|
-fn yy_state_938(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_946(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COMMA => Shift(yy_state_939)
-    NT_option_COMMA_ => Shift(yy_state_948)
-    T_RBRACKET => Reduce(0, NT_option_COMMA_, yy_action_865)
+    T_COMMA => Shift(yy_state_947)
+    NT_option_COMMA_ => Shift(yy_state_956)
+    T_RBRACKET => Reduce(0, NT_option_COMMA_, yy_action_877)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_939(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_947(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_tvar_binder => Shift(yy_state_940)
-    T_UIDENT => Shift(yy_state_941)
-    T_RBRACKET => Reduce(1, NT_option_COMMA_, yy_action_863)
+    NT_tvar_binder => Shift(yy_state_948)
+    T_UIDENT => Shift(yy_state_949)
+    T_RBRACKET => Reduce(1, NT_option_COMMA_, yy_action_875)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_940(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_948(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(
     3,
     NT_non_empty_list_commas_rev_id_tvar_binder__,
-    yy_action_331,
+    yy_action_341,
   )
 }
 
 ///|
-fn yy_state_941(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_949(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_942)
-    T_COMMA | T_RBRACKET => Reduce(1, NT_tvar_binder, yy_action_330)
+    T_COLON => Shift(yy_state_950)
+    T_COMMA | T_RBRACKET => Reduce(1, NT_tvar_binder, yy_action_340)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_942(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_950(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_PACKAGE_NAME => Shift(yy_state_20)
     T_UIDENT => Shift(yy_state_23)
-    NT_tvar_constraint => Shift(yy_state_943)
-    NT_qual_ident_ty => Shift(yy_state_946)
-    NT_separated_nonempty_list_PLUS_tvar_constraint_ => Shift(yy_state_947)
+    NT_tvar_constraint => Shift(yy_state_951)
+    NT_qual_ident_ty => Shift(yy_state_954)
+    NT_separated_nonempty_list_PLUS_tvar_constraint_ => Shift(yy_state_955)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_943(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_951(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_PLUS => Shift(yy_state_944)
+    T_PLUS => Shift(yy_state_952)
     T_COMMA | T_RBRACKET | T_LBRACE =>
-      Reduce(1, NT_separated_nonempty_list_PLUS_tvar_constraint_, yy_action_329)
+      Reduce(1, NT_separated_nonempty_list_PLUS_tvar_constraint_, yy_action_339)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_944(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_952(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_PACKAGE_NAME => Shift(yy_state_20)
     T_UIDENT => Shift(yy_state_23)
-    NT_tvar_constraint => Shift(yy_state_943)
-    NT_separated_nonempty_list_PLUS_tvar_constraint_ => Shift(yy_state_945)
-    NT_qual_ident_ty => Shift(yy_state_946)
+    NT_tvar_constraint => Shift(yy_state_951)
+    NT_separated_nonempty_list_PLUS_tvar_constraint_ => Shift(yy_state_953)
+    NT_qual_ident_ty => Shift(yy_state_954)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_945(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_953(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(
     3,
     NT_separated_nonempty_list_PLUS_tvar_constraint_,
-    yy_action_328,
+    yy_action_338,
   )
 }
 
 ///|
-fn yy_state_946(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_tvar_constraint, yy_action_327)
+fn yy_state_954(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_tvar_constraint, yy_action_337)
 }
 
 ///|
-fn yy_state_947(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_tvar_binder, yy_action_326)
+fn yy_state_955(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(3, NT_tvar_binder, yy_action_336)
 }
 
 ///|
-fn yy_state_948(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_non_empty_list_commas_id_tvar_binder__, yy_action_325)
+fn yy_state_956(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(2, NT_non_empty_list_commas_id_tvar_binder__, yy_action_335)
 }
 
 ///|
-fn yy_state_949(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_957(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RBRACKET => Shift(yy_state_950)
+    T_RBRACKET => Shift(yy_state_958)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_950(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_type_parameters, yy_action_323)
+fn yy_state_958(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(3, NT_type_parameters, yy_action_333)
 }
 
 ///|
-fn yy_state_951(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_959(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_type_parameters => Shift(yy_state_895)
-    NT_option_type_parameters_ => Shift(yy_state_935)
-    T_LBRACKET => Shift(yy_state_936)
-    NT_optional_type_parameters => Shift(yy_state_952)
+    NT_type_parameters => Shift(yy_state_903)
+    NT_option_type_parameters_ => Shift(yy_state_943)
+    T_LBRACKET => Shift(yy_state_944)
+    NT_optional_type_parameters => Shift(yy_state_960)
     T_UIDENT | T_AMPER | T_PACKAGE_NAME =>
-      Reduce(0, NT_option_type_parameters_, yy_action_356)
+      Reduce(0, NT_option_type_parameters_, yy_action_366)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_952(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_960(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_AMPER => Shift(yy_state_18)
     T_PACKAGE_NAME => Shift(yy_state_20)
     T_UIDENT => Shift(yy_state_23)
     NT_qual_ident_ty => Shift(yy_state_24)
-    NT_type_name => Shift(yy_state_953)
+    NT_type_name => Shift(yy_state_961)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_953(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_961(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_WITH => Shift(yy_state_954)
-    T_FOR => Shift(yy_state_1045)
+    T_WITH => Shift(yy_state_962)
+    T_FOR => Shift(yy_state_1053)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_954(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_962(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LIDENT => Shift(yy_state_955)
+    T_LIDENT => Shift(yy_state_963)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_955(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_963(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_EXCLAMATION => Shift(yy_state_726)
-    NT_optional_bang => Shift(yy_state_956)
-    T_LPAREN => Reduce(0, NT_optional_bang, yy_action_851)
+    T_EXCLAMATION => Shift(yy_state_734)
+    NT_optional_bang => Shift(yy_state_964)
+    T_LPAREN => Reduce(0, NT_optional_bang, yy_action_863)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_956(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_964(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LPAREN => Shift(yy_state_148)
-    NT_parameters => Shift(yy_state_957)
+    NT_parameters => Shift(yy_state_965)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_957(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_965(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_error_annotation => Shift(yy_state_50)
     T_THIN_ARROW => Shift(yy_state_51)
     T_NORAISE => Shift(yy_state_83)
     T_RAISE => Shift(yy_state_84)
-    NT_func_return_type => Shift(yy_state_958)
-    T_EQUAL | T_LBRACE => Reduce(0, NT_func_return_type, yy_action_850)
+    NT_func_return_type => Shift(yy_state_966)
+    T_EQUAL | T_LBRACE => Reduce(0, NT_func_return_type, yy_action_862)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_958(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_966(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_impl_body => Shift(yy_state_959)
-    T_EQUAL => Shift(yy_state_960)
-    NT_block_expr_with_local_types => Shift(yy_state_962)
-    T_LBRACE => Shift(yy_state_963)
+    NT_impl_body => Shift(yy_state_967)
+    T_EQUAL => Shift(yy_state_968)
+    NT_block_expr_with_local_types => Shift(yy_state_970)
+    T_LBRACE => Shift(yy_state_971)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_959(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(9, NT_structure_item, yy_action_322)
+fn yy_state_967(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(9, NT_structure_item, yy_action_332)
 }
 
 ///|
-fn yy_state_960(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_968(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_STRING => Shift(yy_state_961)
+    T_STRING => Shift(yy_state_969)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_961(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_impl_body, yy_action_321)
+fn yy_state_969(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(2, NT_impl_body, yy_action_331)
 }
 
 ///|
-fn yy_state_962(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_impl_body, yy_action_320)
+fn yy_state_970(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_impl_body, yy_action_330)
 }
 
 ///|
-fn yy_state_963(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_971(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_multiline_string => Shift(yy_state_2)
     T_MULTILINE_INTERP => Shift(yy_state_4)
@@ -43408,74 +44348,74 @@ fn yy_state_963(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    T_POST_LABEL => Shift(yy_state_528)
-    NT_expr => Shift(yy_state_533)
-    NT_left_value => Shift(yy_state_534)
-    T_ELLIPSIS => Shift(yy_state_539)
-    T_RAISE => Shift(yy_state_540)
-    T_PACKAGE_NAME => Shift(yy_state_542)
-    T_LIDENT => Shift(yy_state_544)
-    NT_expr_statement_no_break_continue_return => Shift(yy_state_599)
-    T_RETURN => Shift(yy_state_600)
-    T_CONTINUE => Shift(yy_state_603)
-    T_BREAK => Shift(yy_state_612)
-    T_GUARD => Shift(yy_state_739)
-    NT_expr_statement => Shift(yy_state_743)
-    T_DEFER => Shift(yy_state_744)
-    NT_guard_statement => Shift(yy_state_746)
-    T_FN => Shift(yy_state_747)
-    T_ASYNC => Shift(yy_state_753)
-    T_LETREC => Shift(yy_state_760)
-    T_LET => Shift(yy_state_786)
-    NT_non_empty_list_semis_rev_statement_ => Shift(yy_state_802)
-    NT_local_types_and_stmts => Shift(yy_state_964)
-    NT_list_semis_rev_statement_ => Shift(yy_state_966)
-    NT_local_type_decl => Shift(yy_state_967)
-    T_TYPE => Shift(yy_state_970)
-    T_ENUM => Shift(yy_state_988)
-    T_STRUCT => Shift(yy_state_994)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
-    T_RBRACE => Reduce(0, NT_list_semis_rev_statement_, yy_action_802)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_POST_LABEL => Shift(yy_state_530)
+    NT_expr => Shift(yy_state_535)
+    NT_left_value => Shift(yy_state_536)
+    T_ELLIPSIS => Shift(yy_state_541)
+    T_RAISE => Shift(yy_state_542)
+    T_PACKAGE_NAME => Shift(yy_state_544)
+    T_LIDENT => Shift(yy_state_546)
+    NT_expr_statement_no_break_continue_return => Shift(yy_state_601)
+    T_RETURN => Shift(yy_state_602)
+    T_CONTINUE => Shift(yy_state_605)
+    T_BREAK => Shift(yy_state_614)
+    T_GUARD => Shift(yy_state_747)
+    NT_expr_statement => Shift(yy_state_751)
+    T_DEFER => Shift(yy_state_752)
+    NT_guard_statement => Shift(yy_state_754)
+    T_FN => Shift(yy_state_755)
+    T_ASYNC => Shift(yy_state_761)
+    T_LETREC => Shift(yy_state_768)
+    T_LET => Shift(yy_state_794)
+    NT_non_empty_list_semis_rev_statement_ => Shift(yy_state_810)
+    NT_local_types_and_stmts => Shift(yy_state_972)
+    NT_list_semis_rev_statement_ => Shift(yy_state_974)
+    NT_local_type_decl => Shift(yy_state_975)
+    T_TYPE => Shift(yy_state_978)
+    T_ENUM => Shift(yy_state_996)
+    T_STRUCT => Shift(yy_state_1002)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
+    T_RBRACE => Reduce(0, NT_list_semis_rev_statement_, yy_action_814)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_964(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_972(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RBRACE => Shift(yy_state_965)
+    T_RBRACE => Shift(yy_state_973)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_965(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_block_expr_with_local_types, yy_action_319)
+fn yy_state_973(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(3, NT_block_expr_with_local_types, yy_action_329)
 }
 
 ///|
-fn yy_state_966(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_local_types_and_stmts, yy_action_318)
+fn yy_state_974(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_local_types_and_stmts, yy_action_328)
 }
 
 ///|
-fn yy_state_967(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_975(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_SEMI => Shift(yy_state_968)
-    T_RBRACE => Reduce(1, NT_local_types_and_stmts, yy_action_317)
+    T_SEMI => Shift(yy_state_976)
+    T_RBRACE => Reduce(1, NT_local_types_and_stmts, yy_action_327)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_968(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_976(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_multiline_string => Shift(yy_state_2)
     T_MULTILINE_INTERP => Shift(yy_state_4)
@@ -43529,60 +44469,60 @@ fn yy_state_968(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    T_POST_LABEL => Shift(yy_state_528)
-    NT_expr => Shift(yy_state_533)
-    NT_left_value => Shift(yy_state_534)
-    T_ELLIPSIS => Shift(yy_state_539)
-    T_RAISE => Shift(yy_state_540)
-    T_PACKAGE_NAME => Shift(yy_state_542)
-    T_LIDENT => Shift(yy_state_544)
-    NT_expr_statement_no_break_continue_return => Shift(yy_state_599)
-    T_RETURN => Shift(yy_state_600)
-    T_CONTINUE => Shift(yy_state_603)
-    T_BREAK => Shift(yy_state_612)
-    T_GUARD => Shift(yy_state_739)
-    NT_expr_statement => Shift(yy_state_743)
-    T_DEFER => Shift(yy_state_744)
-    NT_guard_statement => Shift(yy_state_746)
-    T_FN => Shift(yy_state_747)
-    T_ASYNC => Shift(yy_state_753)
-    T_LETREC => Shift(yy_state_760)
-    T_LET => Shift(yy_state_786)
-    NT_non_empty_list_semis_rev_statement_ => Shift(yy_state_802)
-    NT_list_semis_rev_statement_ => Shift(yy_state_966)
-    NT_local_type_decl => Shift(yy_state_967)
-    NT_local_types_and_stmts => Shift(yy_state_969)
-    T_TYPE => Shift(yy_state_970)
-    T_ENUM => Shift(yy_state_988)
-    T_STRUCT => Shift(yy_state_994)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
-    T_RBRACE => Reduce(0, NT_list_semis_rev_statement_, yy_action_802)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_POST_LABEL => Shift(yy_state_530)
+    NT_expr => Shift(yy_state_535)
+    NT_left_value => Shift(yy_state_536)
+    T_ELLIPSIS => Shift(yy_state_541)
+    T_RAISE => Shift(yy_state_542)
+    T_PACKAGE_NAME => Shift(yy_state_544)
+    T_LIDENT => Shift(yy_state_546)
+    NT_expr_statement_no_break_continue_return => Shift(yy_state_601)
+    T_RETURN => Shift(yy_state_602)
+    T_CONTINUE => Shift(yy_state_605)
+    T_BREAK => Shift(yy_state_614)
+    T_GUARD => Shift(yy_state_747)
+    NT_expr_statement => Shift(yy_state_751)
+    T_DEFER => Shift(yy_state_752)
+    NT_guard_statement => Shift(yy_state_754)
+    T_FN => Shift(yy_state_755)
+    T_ASYNC => Shift(yy_state_761)
+    T_LETREC => Shift(yy_state_768)
+    T_LET => Shift(yy_state_794)
+    NT_non_empty_list_semis_rev_statement_ => Shift(yy_state_810)
+    NT_list_semis_rev_statement_ => Shift(yy_state_974)
+    NT_local_type_decl => Shift(yy_state_975)
+    NT_local_types_and_stmts => Shift(yy_state_977)
+    T_TYPE => Shift(yy_state_978)
+    T_ENUM => Shift(yy_state_996)
+    T_STRUCT => Shift(yy_state_1002)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
+    T_RBRACE => Reduce(0, NT_list_semis_rev_statement_, yy_action_814)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_969(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_local_types_and_stmts, yy_action_316)
+fn yy_state_977(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(3, NT_local_types_and_stmts, yy_action_326)
 }
 
 ///|
-fn yy_state_970(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_978(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_971)
+    T_UIDENT => Shift(yy_state_979)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_971(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_979(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -43591,108 +44531,108 @@ fn yy_state_971(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_type_ => Shift(yy_state_972)
+    NT_type_ => Shift(yy_state_980)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_972(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_980(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_DERIVE => Shift(yy_state_973)
-    NT_deriving_directive_list => Shift(yy_state_987)
-    T_SEMI | T_RBRACE => Reduce(0, NT_deriving_directive_list, yy_action_315)
+    T_DERIVE => Shift(yy_state_981)
+    NT_deriving_directive_list => Shift(yy_state_995)
+    T_SEMI | T_RBRACE => Reduce(0, NT_deriving_directive_list, yy_action_325)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_973(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_981(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LPAREN => Shift(yy_state_974)
+    T_LPAREN => Shift(yy_state_982)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_974(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_982(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_AMPER => Shift(yy_state_18)
     T_PACKAGE_NAME => Shift(yy_state_20)
     T_UIDENT => Shift(yy_state_23)
     NT_qual_ident_ty => Shift(yy_state_24)
-    NT_deriving_directive => Shift(yy_state_975)
-    NT_non_empty_list_commas_rev_deriving_directive_ => Shift(yy_state_976)
-    NT_type_name => Shift(yy_state_980)
-    NT_non_empty_list_commas_deriving_directive_ => Shift(yy_state_984)
-    NT_list_commas_deriving_directive_ => Shift(yy_state_985)
-    T_RPAREN => Reduce(0, NT_list_commas_deriving_directive_, yy_action_314)
+    NT_deriving_directive => Shift(yy_state_983)
+    NT_non_empty_list_commas_rev_deriving_directive_ => Shift(yy_state_984)
+    NT_type_name => Shift(yy_state_988)
+    NT_non_empty_list_commas_deriving_directive_ => Shift(yy_state_992)
+    NT_list_commas_deriving_directive_ => Shift(yy_state_993)
+    T_RPAREN => Reduce(0, NT_list_commas_deriving_directive_, yy_action_324)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_975(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_983(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(
     1,
     NT_non_empty_list_commas_rev_deriving_directive_,
-    yy_action_313,
+    yy_action_323,
   )
 }
 
 ///|
-fn yy_state_976(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_984(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_option_COMMA_ => Shift(yy_state_977)
-    T_COMMA => Shift(yy_state_978)
-    T_RPAREN => Reduce(0, NT_option_COMMA_, yy_action_865)
+    NT_option_COMMA_ => Shift(yy_state_985)
+    T_COMMA => Shift(yy_state_986)
+    T_RPAREN => Reduce(0, NT_option_COMMA_, yy_action_877)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_977(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_985(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(
     2,
     NT_non_empty_list_commas_deriving_directive_,
-    yy_action_312,
+    yy_action_322,
   )
 }
 
 ///|
-fn yy_state_978(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_986(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_AMPER => Shift(yy_state_18)
     T_PACKAGE_NAME => Shift(yy_state_20)
     T_UIDENT => Shift(yy_state_23)
     NT_qual_ident_ty => Shift(yy_state_24)
-    NT_deriving_directive => Shift(yy_state_979)
-    NT_type_name => Shift(yy_state_980)
-    T_RPAREN => Reduce(1, NT_option_COMMA_, yy_action_863)
+    NT_deriving_directive => Shift(yy_state_987)
+    NT_type_name => Shift(yy_state_988)
+    T_RPAREN => Reduce(1, NT_option_COMMA_, yy_action_875)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_979(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_987(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(
     3,
     NT_non_empty_list_commas_rev_deriving_directive_,
-    yy_action_311,
+    yy_action_321,
   )
 }
 
 ///|
-fn yy_state_980(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_988(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LPAREN => Shift(yy_state_981)
-    T_RPAREN | T_COMMA => Reduce(1, NT_deriving_directive, yy_action_310)
+    T_LPAREN => Shift(yy_state_989)
+    T_RPAREN | T_COMMA => Reduce(1, NT_deriving_directive, yy_action_320)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_981(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_989(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_multiline_string => Shift(yy_state_2)
     T_MULTILINE_INTERP => Shift(yy_state_4)
@@ -43750,130 +44690,130 @@ fn yy_state_981(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    T_POST_LABEL => Shift(yy_state_639)
-    T_LIDENT => Shift(yy_state_642)
-    NT_list_commas_argument_ => Shift(yy_state_982)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
-    T_RPAREN => Reduce(0, NT_list_commas_argument_, yy_action_780)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_POST_LABEL => Shift(yy_state_647)
+    T_LIDENT => Shift(yy_state_650)
+    NT_list_commas_argument_ => Shift(yy_state_990)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
+    T_RPAREN => Reduce(0, NT_list_commas_argument_, yy_action_792)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_982(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_990(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RPAREN => Shift(yy_state_983)
+    T_RPAREN => Shift(yy_state_991)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_983(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(4, NT_deriving_directive, yy_action_309)
+fn yy_state_991(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(4, NT_deriving_directive, yy_action_319)
 }
 
 ///|
-fn yy_state_984(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_list_commas_deriving_directive_, yy_action_308)
+fn yy_state_992(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_list_commas_deriving_directive_, yy_action_318)
 }
 
 ///|
-fn yy_state_985(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_993(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RPAREN => Shift(yy_state_986)
+    T_RPAREN => Shift(yy_state_994)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_986(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(4, NT_deriving_directive_list, yy_action_307)
+fn yy_state_994(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(4, NT_deriving_directive_list, yy_action_317)
 }
 
 ///|
-fn yy_state_987(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(4, NT_local_type_decl, yy_action_306)
+fn yy_state_995(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(4, NT_local_type_decl, yy_action_316)
 }
 
 ///|
-fn yy_state_988(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_996(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_989)
+    T_UIDENT => Shift(yy_state_997)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_989(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_997(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACE => Shift(yy_state_990)
+    T_LBRACE => Shift(yy_state_998)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_990(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_998(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_ATTRIBUTE => Shift(yy_state_845)
-    NT_enum_constructor => Shift(yy_state_899)
-    NT_non_empty_list_attribute_ => Shift(yy_state_903)
-    T_UIDENT => Shift(yy_state_923)
-    NT_non_empty_list_semis_enum_constructor_ => Shift(yy_state_926)
-    NT_list_semis_enum_constructor_ => Shift(yy_state_991)
-    T_RBRACE => Reduce(0, NT_list_semis_enum_constructor_, yy_action_354)
+    T_ATTRIBUTE => Shift(yy_state_853)
+    NT_enum_constructor => Shift(yy_state_907)
+    NT_non_empty_list_attribute_ => Shift(yy_state_911)
+    T_UIDENT => Shift(yy_state_931)
+    NT_non_empty_list_semis_enum_constructor_ => Shift(yy_state_934)
+    NT_list_semis_enum_constructor_ => Shift(yy_state_999)
+    T_RBRACE => Reduce(0, NT_list_semis_enum_constructor_, yy_action_364)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_991(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_999(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RBRACE => Shift(yy_state_992)
+    T_RBRACE => Shift(yy_state_1000)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_992(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1000(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_DERIVE => Shift(yy_state_973)
-    NT_deriving_directive_list => Shift(yy_state_993)
-    T_SEMI | T_RBRACE => Reduce(0, NT_deriving_directive_list, yy_action_315)
+    T_DERIVE => Shift(yy_state_981)
+    NT_deriving_directive_list => Shift(yy_state_1001)
+    T_SEMI | T_RBRACE => Reduce(0, NT_deriving_directive_list, yy_action_325)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_993(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(6, NT_local_type_decl, yy_action_305)
+fn yy_state_1001(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(6, NT_local_type_decl, yy_action_315)
 }
 
 ///|
-fn yy_state_994(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1002(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_995)
+    T_UIDENT => Shift(yy_state_1003)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_995(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1003(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LPAREN => Shift(yy_state_996)
-    T_LBRACE => Shift(yy_state_1000)
+    T_LPAREN => Shift(yy_state_1004)
+    T_LBRACE => Shift(yy_state_1008)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_996(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1004(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -43884,147 +44824,147 @@ fn yy_state_996(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_non_empty_list_commas_type__ => Shift(yy_state_997)
+    NT_non_empty_list_commas_type__ => Shift(yy_state_1005)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_997(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1005(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RPAREN => Shift(yy_state_998)
+    T_RPAREN => Shift(yy_state_1006)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_998(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1006(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_DERIVE => Shift(yy_state_973)
-    NT_deriving_directive_list => Shift(yy_state_999)
-    T_SEMI | T_RBRACE => Reduce(0, NT_deriving_directive_list, yy_action_315)
+    T_DERIVE => Shift(yy_state_981)
+    NT_deriving_directive_list => Shift(yy_state_1007)
+    T_SEMI | T_RBRACE => Reduce(0, NT_deriving_directive_list, yy_action_325)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_999(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(6, NT_local_type_decl, yy_action_304)
+fn yy_state_1007(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(6, NT_local_type_decl, yy_action_314)
 }
 
 ///|
-fn yy_state_1000(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1008(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_ATTRIBUTE => Shift(yy_state_845)
-    T_MUTABLE => Shift(yy_state_913)
-    NT_record_decl_field => Shift(yy_state_1001)
-    NT_non_empty_list_attribute_ => Shift(yy_state_1005)
-    T_PUB => Shift(yy_state_1026)
-    T_PRIV => Shift(yy_state_1032)
-    NT_option_MUTABLE_ => Shift(yy_state_1037)
-    NT_non_empty_list_semis_record_decl_field_ => Shift(yy_state_1041)
-    NT_list_semis_record_decl_field_ => Shift(yy_state_1042)
-    T_RBRACE => Reduce(0, NT_list_semis_record_decl_field_, yy_action_303)
-    T_LIDENT => Reduce(0, NT_option_MUTABLE_, yy_action_350)
+    T_ATTRIBUTE => Shift(yy_state_853)
+    T_MUTABLE => Shift(yy_state_921)
+    NT_record_decl_field => Shift(yy_state_1009)
+    NT_non_empty_list_attribute_ => Shift(yy_state_1013)
+    T_PUB => Shift(yy_state_1034)
+    T_PRIV => Shift(yy_state_1040)
+    NT_option_MUTABLE_ => Shift(yy_state_1045)
+    NT_non_empty_list_semis_record_decl_field_ => Shift(yy_state_1049)
+    NT_list_semis_record_decl_field_ => Shift(yy_state_1050)
+    T_RBRACE => Reduce(0, NT_list_semis_record_decl_field_, yy_action_313)
+    T_LIDENT => Reduce(0, NT_option_MUTABLE_, yy_action_360)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1001(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1009(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_option_SEMI_ => Shift(yy_state_1002)
-    T_SEMI => Shift(yy_state_1003)
-    T_RBRACE => Reduce(0, NT_option_SEMI_, yy_action_800)
+    NT_option_SEMI_ => Shift(yy_state_1010)
+    T_SEMI => Shift(yy_state_1011)
+    T_RBRACE => Reduce(0, NT_option_SEMI_, yy_action_812)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1002(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1010(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(
     2,
     NT_non_empty_list_semis_record_decl_field_,
-    yy_action_302,
+    yy_action_312,
   )
 }
 
 ///|
-fn yy_state_1003(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1011(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_ATTRIBUTE => Shift(yy_state_845)
-    T_MUTABLE => Shift(yy_state_913)
-    NT_record_decl_field => Shift(yy_state_1001)
-    NT_non_empty_list_semis_record_decl_field_ => Shift(yy_state_1004)
-    NT_non_empty_list_attribute_ => Shift(yy_state_1005)
-    T_PUB => Shift(yy_state_1026)
-    T_PRIV => Shift(yy_state_1032)
-    NT_option_MUTABLE_ => Shift(yy_state_1037)
-    T_LIDENT => Reduce(0, NT_option_MUTABLE_, yy_action_350)
-    T_RBRACE => Reduce(1, NT_option_SEMI_, yy_action_798)
+    T_ATTRIBUTE => Shift(yy_state_853)
+    T_MUTABLE => Shift(yy_state_921)
+    NT_record_decl_field => Shift(yy_state_1009)
+    NT_non_empty_list_semis_record_decl_field_ => Shift(yy_state_1012)
+    NT_non_empty_list_attribute_ => Shift(yy_state_1013)
+    T_PUB => Shift(yy_state_1034)
+    T_PRIV => Shift(yy_state_1040)
+    NT_option_MUTABLE_ => Shift(yy_state_1045)
+    T_LIDENT => Reduce(0, NT_option_MUTABLE_, yy_action_360)
+    T_RBRACE => Reduce(1, NT_option_SEMI_, yy_action_810)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1004(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1012(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(
     3,
     NT_non_empty_list_semis_record_decl_field_,
-    yy_action_301,
+    yy_action_311,
   )
 }
 
 ///|
-fn yy_state_1005(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1013(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_MUTABLE => Shift(yy_state_913)
-    T_PUB => Shift(yy_state_1006)
-    T_PRIV => Shift(yy_state_1017)
-    NT_option_MUTABLE_ => Shift(yy_state_1022)
-    T_LIDENT => Reduce(0, NT_option_MUTABLE_, yy_action_350)
+    T_MUTABLE => Shift(yy_state_921)
+    T_PUB => Shift(yy_state_1014)
+    T_PRIV => Shift(yy_state_1025)
+    NT_option_MUTABLE_ => Shift(yy_state_1030)
+    T_LIDENT => Reduce(0, NT_option_MUTABLE_, yy_action_360)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1006(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1014(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_pub_attr => Shift(yy_state_1007)
-    T_LPAREN => Shift(yy_state_1012)
-    T_LIDENT | T_MUTABLE => Reduce(0, NT_pub_attr, yy_action_300)
+    NT_pub_attr => Shift(yy_state_1015)
+    T_LPAREN => Shift(yy_state_1020)
+    T_LIDENT | T_MUTABLE => Reduce(0, NT_pub_attr, yy_action_310)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1007(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1015(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_MUTABLE => Shift(yy_state_913)
-    NT_option_MUTABLE_ => Shift(yy_state_1008)
-    T_LIDENT => Reduce(0, NT_option_MUTABLE_, yy_action_350)
+    T_MUTABLE => Shift(yy_state_921)
+    NT_option_MUTABLE_ => Shift(yy_state_1016)
+    T_LIDENT => Reduce(0, NT_option_MUTABLE_, yy_action_360)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1008(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1016(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LIDENT => Shift(yy_state_1009)
+    T_LIDENT => Shift(yy_state_1017)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1009(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1017(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_1010)
+    T_COLON => Shift(yy_state_1018)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1010(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1018(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -44033,79 +44973,79 @@ fn yy_state_1010(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_type_ => Shift(yy_state_1011)
+    NT_type_ => Shift(yy_state_1019)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1011(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(7, NT_record_decl_field, yy_action_299)
+fn yy_state_1019(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(7, NT_record_decl_field, yy_action_309)
 }
 
 ///|
-fn yy_state_1012(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1020(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LIDENT => Shift(yy_state_1013)
-    T_READONLY => Shift(yy_state_1015)
+    T_LIDENT => Shift(yy_state_1021)
+    T_READONLY => Shift(yy_state_1023)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1013(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1021(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RPAREN => Shift(yy_state_1014)
+    T_RPAREN => Shift(yy_state_1022)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1014(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_pub_attr, yy_action_298)
+fn yy_state_1022(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(3, NT_pub_attr, yy_action_308)
 }
 
 ///|
-fn yy_state_1015(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1023(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RPAREN => Shift(yy_state_1016)
+    T_RPAREN => Shift(yy_state_1024)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1016(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_pub_attr, yy_action_297)
+fn yy_state_1024(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(3, NT_pub_attr, yy_action_307)
 }
 
 ///|
-fn yy_state_1017(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1025(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_MUTABLE => Shift(yy_state_913)
-    NT_option_MUTABLE_ => Shift(yy_state_1018)
-    T_LIDENT => Reduce(0, NT_option_MUTABLE_, yy_action_350)
+    T_MUTABLE => Shift(yy_state_921)
+    NT_option_MUTABLE_ => Shift(yy_state_1026)
+    T_LIDENT => Reduce(0, NT_option_MUTABLE_, yy_action_360)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1018(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1026(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LIDENT => Shift(yy_state_1019)
+    T_LIDENT => Shift(yy_state_1027)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1019(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1027(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_1020)
+    T_COLON => Shift(yy_state_1028)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1020(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1028(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -44114,34 +45054,34 @@ fn yy_state_1020(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_type_ => Shift(yy_state_1021)
+    NT_type_ => Shift(yy_state_1029)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1021(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(6, NT_record_decl_field, yy_action_296)
+fn yy_state_1029(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(6, NT_record_decl_field, yy_action_306)
 }
 
 ///|
-fn yy_state_1022(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1030(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LIDENT => Shift(yy_state_1023)
+    T_LIDENT => Shift(yy_state_1031)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1023(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1031(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_1024)
+    T_COLON => Shift(yy_state_1032)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1024(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1032(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -44150,54 +45090,54 @@ fn yy_state_1024(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_type_ => Shift(yy_state_1025)
+    NT_type_ => Shift(yy_state_1033)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1025(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(5, NT_record_decl_field, yy_action_295)
+fn yy_state_1033(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(5, NT_record_decl_field, yy_action_305)
 }
 
 ///|
-fn yy_state_1026(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1034(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LPAREN => Shift(yy_state_1012)
-    NT_pub_attr => Shift(yy_state_1027)
-    T_LIDENT | T_MUTABLE => Reduce(0, NT_pub_attr, yy_action_300)
+    T_LPAREN => Shift(yy_state_1020)
+    NT_pub_attr => Shift(yy_state_1035)
+    T_LIDENT | T_MUTABLE => Reduce(0, NT_pub_attr, yy_action_310)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1027(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1035(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_MUTABLE => Shift(yy_state_913)
-    NT_option_MUTABLE_ => Shift(yy_state_1028)
-    T_LIDENT => Reduce(0, NT_option_MUTABLE_, yy_action_350)
+    T_MUTABLE => Shift(yy_state_921)
+    NT_option_MUTABLE_ => Shift(yy_state_1036)
+    T_LIDENT => Reduce(0, NT_option_MUTABLE_, yy_action_360)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1028(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1036(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LIDENT => Shift(yy_state_1029)
+    T_LIDENT => Shift(yy_state_1037)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1029(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1037(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_1030)
+    T_COLON => Shift(yy_state_1038)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1030(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1038(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -44206,44 +45146,44 @@ fn yy_state_1030(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_type_ => Shift(yy_state_1031)
+    NT_type_ => Shift(yy_state_1039)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1031(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(6, NT_record_decl_field, yy_action_294)
+fn yy_state_1039(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(6, NT_record_decl_field, yy_action_304)
 }
 
 ///|
-fn yy_state_1032(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1040(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_MUTABLE => Shift(yy_state_913)
-    NT_option_MUTABLE_ => Shift(yy_state_1033)
-    T_LIDENT => Reduce(0, NT_option_MUTABLE_, yy_action_350)
+    T_MUTABLE => Shift(yy_state_921)
+    NT_option_MUTABLE_ => Shift(yy_state_1041)
+    T_LIDENT => Reduce(0, NT_option_MUTABLE_, yy_action_360)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1033(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1041(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LIDENT => Shift(yy_state_1034)
+    T_LIDENT => Shift(yy_state_1042)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1034(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1042(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_1035)
+    T_COLON => Shift(yy_state_1043)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1035(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1043(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -44252,34 +45192,34 @@ fn yy_state_1035(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_type_ => Shift(yy_state_1036)
+    NT_type_ => Shift(yy_state_1044)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1036(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(5, NT_record_decl_field, yy_action_293)
+fn yy_state_1044(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(5, NT_record_decl_field, yy_action_303)
 }
 
 ///|
-fn yy_state_1037(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1045(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LIDENT => Shift(yy_state_1038)
+    T_LIDENT => Shift(yy_state_1046)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1038(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1046(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_1039)
+    T_COLON => Shift(yy_state_1047)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1039(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1047(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -44288,46 +45228,46 @@ fn yy_state_1039(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_type_ => Shift(yy_state_1040)
+    NT_type_ => Shift(yy_state_1048)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1040(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(4, NT_record_decl_field, yy_action_292)
+fn yy_state_1048(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(4, NT_record_decl_field, yy_action_302)
 }
 
 ///|
-fn yy_state_1041(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_list_semis_record_decl_field_, yy_action_291)
+fn yy_state_1049(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_list_semis_record_decl_field_, yy_action_301)
 }
 
 ///|
-fn yy_state_1042(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1050(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RBRACE => Shift(yy_state_1043)
+    T_RBRACE => Shift(yy_state_1051)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1043(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1051(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_DERIVE => Shift(yy_state_973)
-    NT_deriving_directive_list => Shift(yy_state_1044)
-    T_SEMI | T_RBRACE => Reduce(0, NT_deriving_directive_list, yy_action_315)
+    T_DERIVE => Shift(yy_state_981)
+    NT_deriving_directive_list => Shift(yy_state_1052)
+    T_SEMI | T_RBRACE => Reduce(0, NT_deriving_directive_list, yy_action_325)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1044(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(6, NT_local_type_decl, yy_action_290)
+fn yy_state_1052(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(6, NT_local_type_decl, yy_action_300)
 }
 
 ///|
-fn yy_state_1045(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1053(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -44336,522 +45276,522 @@ fn yy_state_1045(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_type_ => Shift(yy_state_1046)
+    NT_type_ => Shift(yy_state_1054)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1046(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1054(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_WITH => Shift(yy_state_1047)
-    T_EOF | T_SEMI => Reduce(5, NT_structure_item, yy_action_289)
+    T_WITH => Shift(yy_state_1055)
+    T_EOF | T_SEMI => Reduce(5, NT_structure_item, yy_action_299)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1047(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1055(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LIDENT => Shift(yy_state_1048)
+    T_LIDENT => Shift(yy_state_1056)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1048(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1056(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_EXCLAMATION => Shift(yy_state_726)
-    NT_optional_bang => Shift(yy_state_1049)
-    T_LPAREN => Reduce(0, NT_optional_bang, yy_action_851)
+    T_EXCLAMATION => Shift(yy_state_734)
+    NT_optional_bang => Shift(yy_state_1057)
+    T_LPAREN => Reduce(0, NT_optional_bang, yy_action_863)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1049(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1057(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LPAREN => Shift(yy_state_148)
-    NT_parameters => Shift(yy_state_1050)
+    NT_parameters => Shift(yy_state_1058)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1050(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1058(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_error_annotation => Shift(yy_state_50)
     T_THIN_ARROW => Shift(yy_state_51)
     T_NORAISE => Shift(yy_state_83)
     T_RAISE => Shift(yy_state_84)
-    NT_func_return_type => Shift(yy_state_1051)
-    T_EQUAL | T_LBRACE => Reduce(0, NT_func_return_type, yy_action_850)
+    NT_func_return_type => Shift(yy_state_1059)
+    T_EQUAL | T_LBRACE => Reduce(0, NT_func_return_type, yy_action_862)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1051(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1059(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_EQUAL => Shift(yy_state_960)
-    NT_block_expr_with_local_types => Shift(yy_state_962)
-    T_LBRACE => Shift(yy_state_963)
-    NT_impl_body => Shift(yy_state_1052)
+    T_EQUAL => Shift(yy_state_968)
+    NT_block_expr_with_local_types => Shift(yy_state_970)
+    T_LBRACE => Shift(yy_state_971)
+    NT_impl_body => Shift(yy_state_1060)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1052(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(11, NT_structure_item, yy_action_288)
+fn yy_state_1060(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(11, NT_structure_item, yy_action_298)
 }
 
 ///|
-fn yy_state_1053(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1061(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_STRING => Shift(yy_state_1054)
-    NT_option_loced_string_ => Shift(yy_state_1055)
-    T_LPAREN | T_LBRACE => Reduce(0, NT_option_loced_string_, yy_action_287)
+    T_STRING => Shift(yy_state_1062)
+    NT_option_loced_string_ => Shift(yy_state_1063)
+    T_LPAREN | T_LBRACE => Reduce(0, NT_option_loced_string_, yy_action_297)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1054(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_option_loced_string_, yy_action_285)
+fn yy_state_1062(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_option_loced_string_, yy_action_295)
 }
 
 ///|
-fn yy_state_1055(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1063(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LPAREN => Shift(yy_state_148)
-    NT_parameters => Shift(yy_state_1056)
-    NT_option_parameters_ => Shift(yy_state_1057)
-    T_LBRACE => Reduce(0, NT_option_parameters_, yy_action_284)
+    NT_parameters => Shift(yy_state_1064)
+    NT_option_parameters_ => Shift(yy_state_1065)
+    T_LBRACE => Reduce(0, NT_option_parameters_, yy_action_294)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1056(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_option_parameters_, yy_action_283)
+fn yy_state_1064(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_option_parameters_, yy_action_293)
 }
 
 ///|
-fn yy_state_1057(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1065(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACE => Shift(yy_state_963)
-    NT_block_expr_with_local_types => Shift(yy_state_1058)
+    T_LBRACE => Shift(yy_state_971)
+    NT_block_expr_with_local_types => Shift(yy_state_1066)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1058(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(4, NT_structure_item, yy_action_282)
+fn yy_state_1066(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(4, NT_structure_item, yy_action_292)
 }
 
 ///|
-fn yy_state_1059(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1067(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1060)
-    NT_batch_type_alias_target_UIDENT_ => Shift(yy_state_1063)
-    T_PACKAGE_NAME => Shift(yy_state_1064)
-    NT_batch_type_alias_targets => Shift(yy_state_1077)
+    T_UIDENT => Shift(yy_state_1068)
+    NT_batch_type_alias_target_UIDENT_ => Shift(yy_state_1071)
+    T_PACKAGE_NAME => Shift(yy_state_1072)
+    NT_batch_type_alias_targets => Shift(yy_state_1085)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1060(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1068(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_AS => Shift(yy_state_1061)
+    T_AS => Shift(yy_state_1069)
     T_EOF | T_RPAREN | T_COMMA | T_SEMI =>
-      Reduce(1, NT_batch_type_alias_target_UIDENT_, yy_action_281)
+      Reduce(1, NT_batch_type_alias_target_UIDENT_, yy_action_291)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1061(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1069(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1062)
+    T_UIDENT => Shift(yy_state_1070)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1062(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_batch_type_alias_target_UIDENT_, yy_action_280)
+fn yy_state_1070(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(3, NT_batch_type_alias_target_UIDENT_, yy_action_290)
 }
 
 ///|
-fn yy_state_1063(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_batch_type_alias_targets, yy_action_279)
+fn yy_state_1071(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_batch_type_alias_targets, yy_action_289)
 }
 
 ///|
-fn yy_state_1064(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1072(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_DOT_UIDENT => Shift(yy_state_1065)
-    T_DOT_LPAREN => Shift(yy_state_1068)
-    NT_batch_type_alias_target_DOT_UIDENT_ => Shift(yy_state_1076)
+    T_DOT_UIDENT => Shift(yy_state_1073)
+    T_DOT_LPAREN => Shift(yy_state_1076)
+    NT_batch_type_alias_target_DOT_UIDENT_ => Shift(yy_state_1084)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1065(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1073(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_AS => Shift(yy_state_1066)
+    T_AS => Shift(yy_state_1074)
     T_EOF | T_SEMI =>
-      Reduce(1, NT_batch_type_alias_target_DOT_UIDENT_, yy_action_278)
+      Reduce(1, NT_batch_type_alias_target_DOT_UIDENT_, yy_action_288)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1066(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1074(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1067)
+    T_UIDENT => Shift(yy_state_1075)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1067(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_batch_type_alias_target_DOT_UIDENT_, yy_action_277)
+fn yy_state_1075(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(3, NT_batch_type_alias_target_DOT_UIDENT_, yy_action_287)
 }
 
 ///|
-fn yy_state_1068(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1076(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1060)
-    NT_batch_type_alias_target_UIDENT_ => Shift(yy_state_1069)
+    T_UIDENT => Shift(yy_state_1068)
+    NT_batch_type_alias_target_UIDENT_ => Shift(yy_state_1077)
     NT_non_empty_list_commas_rev_batch_type_alias_target_UIDENT__ =>
-      Shift(yy_state_1070)
+      Shift(yy_state_1078)
     NT_non_empty_list_commas_batch_type_alias_target_UIDENT__ =>
-      Shift(yy_state_1074)
+      Shift(yy_state_1082)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1069(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1077(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(
     1,
     NT_non_empty_list_commas_rev_batch_type_alias_target_UIDENT__,
-    yy_action_276,
+    yy_action_286,
   )
 }
 
 ///|
-fn yy_state_1070(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1078(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COMMA => Shift(yy_state_1071)
-    NT_option_COMMA_ => Shift(yy_state_1073)
-    T_RPAREN => Reduce(0, NT_option_COMMA_, yy_action_865)
+    T_COMMA => Shift(yy_state_1079)
+    NT_option_COMMA_ => Shift(yy_state_1081)
+    T_RPAREN => Reduce(0, NT_option_COMMA_, yy_action_877)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1071(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1079(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1060)
-    NT_batch_type_alias_target_UIDENT_ => Shift(yy_state_1072)
-    T_RPAREN => Reduce(1, NT_option_COMMA_, yy_action_863)
+    T_UIDENT => Shift(yy_state_1068)
+    NT_batch_type_alias_target_UIDENT_ => Shift(yy_state_1080)
+    T_RPAREN => Reduce(1, NT_option_COMMA_, yy_action_875)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1072(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1080(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(
     3,
     NT_non_empty_list_commas_rev_batch_type_alias_target_UIDENT__,
-    yy_action_275,
+    yy_action_285,
   )
 }
 
 ///|
-fn yy_state_1073(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1081(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(
     2,
     NT_non_empty_list_commas_batch_type_alias_target_UIDENT__,
-    yy_action_274,
+    yy_action_284,
   )
 }
 
 ///|
-fn yy_state_1074(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1082(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RPAREN => Shift(yy_state_1075)
+    T_RPAREN => Shift(yy_state_1083)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1075(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(4, NT_batch_type_alias_targets, yy_action_273)
+fn yy_state_1083(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(4, NT_batch_type_alias_targets, yy_action_283)
 }
 
 ///|
-fn yy_state_1076(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_batch_type_alias_targets, yy_action_272)
+fn yy_state_1084(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(2, NT_batch_type_alias_targets, yy_action_282)
 }
 
 ///|
-fn yy_state_1077(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_structure_item, yy_action_271)
+fn yy_state_1085(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(2, NT_structure_item, yy_action_281)
 }
 
 ///|
-fn yy_state_1078(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1086(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
     T_AMPER => Shift(yy_state_58)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_batch_type_alias_target_UIDENT_ => Shift(yy_state_1063)
-    T_UIDENT => Shift(yy_state_1079)
-    T_PACKAGE_NAME => Shift(yy_state_1080)
-    NT_type_ => Shift(yy_state_1082)
-    NT_batch_type_alias_targets => Shift(yy_state_1086)
+    NT_batch_type_alias_target_UIDENT_ => Shift(yy_state_1071)
+    T_UIDENT => Shift(yy_state_1087)
+    T_PACKAGE_NAME => Shift(yy_state_1088)
+    NT_type_ => Shift(yy_state_1090)
+    NT_batch_type_alias_targets => Shift(yy_state_1094)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1079(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1087(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LBRACKET => Shift(yy_state_68)
-    T_AS => Shift(yy_state_1061)
-    T_QUESTION => Reduce(1, NT_simple_type, yy_action_841)
+    T_AS => Shift(yy_state_1069)
+    T_QUESTION => Reduce(1, NT_simple_type, yy_action_853)
     T_EOF | T_SEMI =>
-      Reduce(1, NT_batch_type_alias_target_UIDENT_, yy_action_281)
+      Reduce(1, NT_batch_type_alias_target_UIDENT_, yy_action_291)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1080(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1088(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_DOT_LIDENT => Shift(yy_state_105)
-    T_DOT_LPAREN => Shift(yy_state_1068)
-    NT_batch_type_alias_target_DOT_UIDENT_ => Shift(yy_state_1076)
-    T_DOT_UIDENT => Shift(yy_state_1081)
+    T_DOT_LPAREN => Shift(yy_state_1076)
+    NT_batch_type_alias_target_DOT_UIDENT_ => Shift(yy_state_1084)
+    T_DOT_UIDENT => Shift(yy_state_1089)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1081(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1089(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LBRACKET => Shift(yy_state_62)
-    T_AS => Shift(yy_state_1066)
+    T_AS => Shift(yy_state_1074)
     T_EOF | T_SEMI =>
-      Reduce(1, NT_batch_type_alias_target_DOT_UIDENT_, yy_action_278)
-    T_QUESTION => Reduce(2, NT_simple_type, yy_action_844)
+      Reduce(1, NT_batch_type_alias_target_DOT_UIDENT_, yy_action_288)
+    T_QUESTION => Reduce(2, NT_simple_type, yy_action_856)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1082(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1090(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_AS => Shift(yy_state_1083)
+    T_AS => Shift(yy_state_1091)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1083(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1091(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1084)
+    T_UIDENT => Shift(yy_state_1092)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1084(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1092(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACKET => Shift(yy_state_849)
+    T_LBRACKET => Shift(yy_state_857)
     NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__ =>
-      Shift(yy_state_860)
-    NT_optional_type_parameters_no_constraints => Shift(yy_state_1085)
+      Shift(yy_state_868)
+    NT_optional_type_parameters_no_constraints => Shift(yy_state_1093)
     T_EOF | T_SEMI =>
       Reduce(
         0,
         NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__,
-        yy_action_384,
+        yy_action_394,
       )
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1085(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(5, NT_structure_item, yy_action_270)
+fn yy_state_1093(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(5, NT_structure_item, yy_action_280)
 }
 
 ///|
-fn yy_state_1086(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_structure_item, yy_action_269)
+fn yy_state_1094(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(2, NT_structure_item, yy_action_279)
 }
 
 ///|
-fn yy_state_1087(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1095(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1088)
+    T_UIDENT => Shift(yy_state_1096)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1088(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1096(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_1089)
+    T_COLON => Shift(yy_state_1097)
     NT_option_preceded_COLON_separated_nonempty_list_PLUS_tvar_constraint___ =>
-      Shift(yy_state_1091)
+      Shift(yy_state_1099)
     T_LBRACE =>
       Reduce(
         0,
         NT_option_preceded_COLON_separated_nonempty_list_PLUS_tvar_constraint___,
-        yy_action_268,
+        yy_action_278,
       )
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1089(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1097(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_PACKAGE_NAME => Shift(yy_state_20)
     T_UIDENT => Shift(yy_state_23)
-    NT_tvar_constraint => Shift(yy_state_943)
-    NT_qual_ident_ty => Shift(yy_state_946)
-    NT_separated_nonempty_list_PLUS_tvar_constraint_ => Shift(yy_state_1090)
+    NT_tvar_constraint => Shift(yy_state_951)
+    NT_qual_ident_ty => Shift(yy_state_954)
+    NT_separated_nonempty_list_PLUS_tvar_constraint_ => Shift(yy_state_1098)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1090(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1098(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(
     2,
     NT_option_preceded_COLON_separated_nonempty_list_PLUS_tvar_constraint___,
-    yy_action_266,
+    yy_action_276,
   )
 }
 
 ///|
-fn yy_state_1091(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1099(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACE => Shift(yy_state_1092)
+    T_LBRACE => Shift(yy_state_1100)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1092(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1100(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_ATTRIBUTE => Shift(yy_state_845)
-    NT_trait_method_decl => Shift(yy_state_1093)
-    NT_non_empty_list_attribute_ => Shift(yy_state_1097)
-    T_LIDENT => Shift(yy_state_1134)
-    T_ASYNC => Shift(yy_state_1142)
-    NT_non_empty_list_semis_trait_method_decl_ => Shift(yy_state_1151)
-    NT_list_semis_trait_method_decl_ => Shift(yy_state_1152)
-    T_RBRACE => Reduce(0, NT_list_semis_trait_method_decl_, yy_action_265)
+    T_ATTRIBUTE => Shift(yy_state_853)
+    NT_trait_method_decl => Shift(yy_state_1101)
+    NT_non_empty_list_attribute_ => Shift(yy_state_1105)
+    T_LIDENT => Shift(yy_state_1142)
+    T_ASYNC => Shift(yy_state_1150)
+    NT_non_empty_list_semis_trait_method_decl_ => Shift(yy_state_1159)
+    NT_list_semis_trait_method_decl_ => Shift(yy_state_1160)
+    T_RBRACE => Reduce(0, NT_list_semis_trait_method_decl_, yy_action_275)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1093(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1101(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_option_SEMI_ => Shift(yy_state_1094)
-    T_SEMI => Shift(yy_state_1095)
-    T_RBRACE => Reduce(0, NT_option_SEMI_, yy_action_800)
+    NT_option_SEMI_ => Shift(yy_state_1102)
+    T_SEMI => Shift(yy_state_1103)
+    T_RBRACE => Reduce(0, NT_option_SEMI_, yy_action_812)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1094(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1102(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(
     2,
     NT_non_empty_list_semis_trait_method_decl_,
-    yy_action_264,
+    yy_action_274,
   )
 }
 
 ///|
-fn yy_state_1095(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1103(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_ATTRIBUTE => Shift(yy_state_845)
-    NT_trait_method_decl => Shift(yy_state_1093)
-    NT_non_empty_list_semis_trait_method_decl_ => Shift(yy_state_1096)
-    NT_non_empty_list_attribute_ => Shift(yy_state_1097)
-    T_LIDENT => Shift(yy_state_1134)
-    T_ASYNC => Shift(yy_state_1142)
-    T_RBRACE => Reduce(1, NT_option_SEMI_, yy_action_798)
+    T_ATTRIBUTE => Shift(yy_state_853)
+    NT_trait_method_decl => Shift(yy_state_1101)
+    NT_non_empty_list_semis_trait_method_decl_ => Shift(yy_state_1104)
+    NT_non_empty_list_attribute_ => Shift(yy_state_1105)
+    T_LIDENT => Shift(yy_state_1142)
+    T_ASYNC => Shift(yy_state_1150)
+    T_RBRACE => Reduce(1, NT_option_SEMI_, yy_action_810)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1096(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1104(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(
     3,
     NT_non_empty_list_semis_trait_method_decl_,
-    yy_action_263,
+    yy_action_273,
   )
 }
 
 ///|
-fn yy_state_1097(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1105(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LIDENT => Shift(yy_state_1098)
-    T_ASYNC => Shift(yy_state_1125)
+    T_LIDENT => Shift(yy_state_1106)
+    T_ASYNC => Shift(yy_state_1133)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1098(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1106(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_EXCLAMATION => Shift(yy_state_726)
-    NT_optional_bang => Shift(yy_state_1099)
-    T_LPAREN | T_LBRACKET => Reduce(0, NT_optional_bang, yy_action_851)
+    T_EXCLAMATION => Shift(yy_state_734)
+    NT_optional_bang => Shift(yy_state_1107)
+    T_LPAREN | T_LBRACKET => Reduce(0, NT_optional_bang, yy_action_863)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1099(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1107(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_type_parameters => Shift(yy_state_895)
-    NT_option_type_parameters_ => Shift(yy_state_935)
-    T_LBRACKET => Shift(yy_state_936)
-    NT_optional_type_parameters => Shift(yy_state_1100)
-    T_LPAREN => Reduce(0, NT_option_type_parameters_, yy_action_356)
+    NT_type_parameters => Shift(yy_state_903)
+    NT_option_type_parameters_ => Shift(yy_state_943)
+    T_LBRACKET => Shift(yy_state_944)
+    NT_optional_type_parameters => Shift(yy_state_1108)
+    T_LPAREN => Reduce(0, NT_option_type_parameters_, yy_action_366)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1100(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1108(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LPAREN => Shift(yy_state_1101)
+    T_LPAREN => Shift(yy_state_1109)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1101(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1109(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -44860,48 +45800,48 @@ fn yy_state_1101(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_trait_method_param => Shift(yy_state_1102)
-    NT_non_empty_list_commas_rev_trait_method_param_ => Shift(yy_state_1103)
-    T_POST_LABEL => Shift(yy_state_1107)
-    T_LIDENT => Shift(yy_state_1110)
-    NT_type_ => Shift(yy_state_1116)
-    NT_non_empty_list_commas_trait_method_param_ => Shift(yy_state_1117)
-    NT_list_commas_trait_method_param_ => Shift(yy_state_1118)
-    T_RPAREN => Reduce(0, NT_list_commas_trait_method_param_, yy_action_262)
+    NT_trait_method_param => Shift(yy_state_1110)
+    NT_non_empty_list_commas_rev_trait_method_param_ => Shift(yy_state_1111)
+    T_POST_LABEL => Shift(yy_state_1115)
+    T_LIDENT => Shift(yy_state_1118)
+    NT_type_ => Shift(yy_state_1124)
+    NT_non_empty_list_commas_trait_method_param_ => Shift(yy_state_1125)
+    NT_list_commas_trait_method_param_ => Shift(yy_state_1126)
+    T_RPAREN => Reduce(0, NT_list_commas_trait_method_param_, yy_action_272)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1102(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1110(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(
     1,
     NT_non_empty_list_commas_rev_trait_method_param_,
-    yy_action_261,
+    yy_action_271,
   )
 }
 
 ///|
-fn yy_state_1103(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1111(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_option_COMMA_ => Shift(yy_state_1104)
-    T_COMMA => Shift(yy_state_1105)
-    T_RPAREN => Reduce(0, NT_option_COMMA_, yy_action_865)
+    NT_option_COMMA_ => Shift(yy_state_1112)
+    T_COMMA => Shift(yy_state_1113)
+    T_RPAREN => Reduce(0, NT_option_COMMA_, yy_action_877)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1104(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1112(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(
     2,
     NT_non_empty_list_commas_trait_method_param_,
-    yy_action_260,
+    yy_action_270,
   )
 }
 
 ///|
-fn yy_state_1105(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1113(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -44910,34 +45850,34 @@ fn yy_state_1105(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_trait_method_param => Shift(yy_state_1106)
-    T_POST_LABEL => Shift(yy_state_1107)
-    T_LIDENT => Shift(yy_state_1110)
-    NT_type_ => Shift(yy_state_1116)
-    T_RPAREN => Reduce(1, NT_option_COMMA_, yy_action_863)
+    NT_trait_method_param => Shift(yy_state_1114)
+    T_POST_LABEL => Shift(yy_state_1115)
+    T_LIDENT => Shift(yy_state_1118)
+    NT_type_ => Shift(yy_state_1124)
+    T_RPAREN => Reduce(1, NT_option_COMMA_, yy_action_875)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1106(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1114(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(
     3,
     NT_non_empty_list_commas_rev_trait_method_param_,
-    yy_action_259,
+    yy_action_269,
   )
 }
 
 ///|
-fn yy_state_1107(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1115(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_1108)
+    T_COLON => Shift(yy_state_1116)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1108(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1116(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -44946,35 +45886,35 @@ fn yy_state_1108(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_type_ => Shift(yy_state_1109)
+    NT_type_ => Shift(yy_state_1117)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1109(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_trait_method_param, yy_action_258)
+fn yy_state_1117(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(3, NT_trait_method_param, yy_action_268)
 }
 
 ///|
-fn yy_state_1110(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1118(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_QUESTION => Shift(yy_state_1111)
-    T_COLON => Shift(yy_state_1114)
+    T_QUESTION => Shift(yy_state_1119)
+    T_COLON => Shift(yy_state_1122)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1111(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1119(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_1112)
+    T_COLON => Shift(yy_state_1120)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1112(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1120(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -44983,18 +45923,18 @@ fn yy_state_1112(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_type_ => Shift(yy_state_1113)
+    NT_type_ => Shift(yy_state_1121)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1113(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(4, NT_trait_method_param, yy_action_257)
+fn yy_state_1121(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(4, NT_trait_method_param, yy_action_267)
 }
 
 ///|
-fn yy_state_1114(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1122(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -45003,96 +45943,30 @@ fn yy_state_1114(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_type_ => Shift(yy_state_1115)
-    _ => Error
-  }
-}
-
-///|
-fn yy_state_1115(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_trait_method_param, yy_action_256)
-}
-
-///|
-fn yy_state_1116(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_trait_method_param, yy_action_255)
-}
-
-///|
-fn yy_state_1117(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_list_commas_trait_method_param_, yy_action_254)
-}
-
-///|
-fn yy_state_1118(_lookahead : YYSymbol) -> YYDecision {
-  match _lookahead {
-    T_RPAREN => Shift(yy_state_1119)
-    _ => Error
-  }
-}
-
-///|
-fn yy_state_1119(_lookahead : YYSymbol) -> YYDecision {
-  match _lookahead {
-    NT_error_annotation => Shift(yy_state_50)
-    T_THIN_ARROW => Shift(yy_state_51)
-    T_NORAISE => Shift(yy_state_83)
-    T_RAISE => Shift(yy_state_84)
-    NT_func_return_type => Shift(yy_state_1120)
-    T_EQUAL | T_SEMI | T_RBRACE => Reduce(0, NT_func_return_type, yy_action_850)
-    _ => Error
-  }
-}
-
-///|
-fn yy_state_1120(_lookahead : YYSymbol) -> YYDecision {
-  match _lookahead {
-    T_EQUAL => Shift(yy_state_1121)
-    NT_option_preceded_EQUAL_wildcard__ => Shift(yy_state_1124)
-    T_SEMI | T_RBRACE =>
-      Reduce(0, NT_option_preceded_EQUAL_wildcard__, yy_action_253)
-    _ => Error
-  }
-}
-
-///|
-fn yy_state_1121(_lookahead : YYSymbol) -> YYDecision {
-  match _lookahead {
-    NT_wildcard => Shift(yy_state_1122)
-    T_UNDERSCORE => Shift(yy_state_1123)
+    NT_type_ => Shift(yy_state_1123)
     _ => Error
   }
 }
 
-///|
-fn yy_state_1122(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_option_preceded_EQUAL_wildcard__, yy_action_251)
-}
-
 ///|
 fn yy_state_1123(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_wildcard, yy_action_250)
+  ReduceNoLookahead(3, NT_trait_method_param, yy_action_266)
 }
 
 ///|
 fn yy_state_1124(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(9, NT_trait_method_decl, yy_action_249)
+  ReduceNoLookahead(1, NT_trait_method_param, yy_action_265)
 }
 
 ///|
 fn yy_state_1125(_lookahead : YYSymbol) -> YYDecision {
-  match _lookahead {
-    T_LIDENT => Shift(yy_state_1126)
-    _ => Error
-  }
+  ReduceNoLookahead(1, NT_list_commas_trait_method_param_, yy_action_264)
 }
 
 ///|
 fn yy_state_1126(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_EXCLAMATION => Shift(yy_state_726)
-    NT_optional_bang => Shift(yy_state_1127)
-    T_LPAREN | T_LBRACKET => Reduce(0, NT_optional_bang, yy_action_851)
+    T_RPAREN => Shift(yy_state_1127)
     _ => Error
   }
 }
@@ -45100,11 +45974,12 @@ fn yy_state_1126(_lookahead : YYSymbol) -> YYDecision {
 ///|
 fn yy_state_1127(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_type_parameters => Shift(yy_state_895)
-    NT_option_type_parameters_ => Shift(yy_state_935)
-    T_LBRACKET => Shift(yy_state_936)
-    NT_optional_type_parameters => Shift(yy_state_1128)
-    T_LPAREN => Reduce(0, NT_option_type_parameters_, yy_action_356)
+    NT_error_annotation => Shift(yy_state_50)
+    T_THIN_ARROW => Shift(yy_state_51)
+    T_NORAISE => Shift(yy_state_83)
+    T_RAISE => Shift(yy_state_84)
+    NT_func_return_type => Shift(yy_state_1128)
+    T_EQUAL | T_SEMI | T_RBRACE => Reduce(0, NT_func_return_type, yy_action_862)
     _ => Error
   }
 }
@@ -45112,7 +45987,10 @@ fn yy_state_1127(_lookahead : YYSymbol) -> YYDecision {
 ///|
 fn yy_state_1128(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LPAREN => Shift(yy_state_1129)
+    T_EQUAL => Shift(yy_state_1129)
+    NT_option_preceded_EQUAL_wildcard__ => Shift(yy_state_1132)
+    T_SEMI | T_RBRACE =>
+      Reduce(0, NT_option_preceded_EQUAL_wildcard__, yy_action_263)
     _ => Error
   }
 }
@@ -45120,68 +45998,41 @@ fn yy_state_1128(_lookahead : YYSymbol) -> YYDecision {
 ///|
 fn yy_state_1129(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_ASYNC => Shift(yy_state_52)
-    T_UNDERSCORE => Shift(yy_state_57)
-    T_AMPER => Shift(yy_state_58)
-    T_PACKAGE_NAME => Shift(yy_state_60)
-    T_UIDENT => Shift(yy_state_67)
-    T_LPAREN => Shift(yy_state_71)
-    NT_simple_type => Shift(yy_state_100)
-    NT_trait_method_param => Shift(yy_state_1102)
-    NT_non_empty_list_commas_rev_trait_method_param_ => Shift(yy_state_1103)
-    T_POST_LABEL => Shift(yy_state_1107)
-    T_LIDENT => Shift(yy_state_1110)
-    NT_type_ => Shift(yy_state_1116)
-    NT_non_empty_list_commas_trait_method_param_ => Shift(yy_state_1117)
-    NT_list_commas_trait_method_param_ => Shift(yy_state_1130)
-    T_RPAREN => Reduce(0, NT_list_commas_trait_method_param_, yy_action_262)
+    NT_wildcard => Shift(yy_state_1130)
+    T_UNDERSCORE => Shift(yy_state_1131)
     _ => Error
   }
 }
 
 ///|
 fn yy_state_1130(_lookahead : YYSymbol) -> YYDecision {
-  match _lookahead {
-    T_RPAREN => Shift(yy_state_1131)
-    _ => Error
-  }
+  ReduceNoLookahead(2, NT_option_preceded_EQUAL_wildcard__, yy_action_261)
 }
 
 ///|
 fn yy_state_1131(_lookahead : YYSymbol) -> YYDecision {
-  match _lookahead {
-    NT_error_annotation => Shift(yy_state_50)
-    T_THIN_ARROW => Shift(yy_state_51)
-    T_NORAISE => Shift(yy_state_83)
-    T_RAISE => Shift(yy_state_84)
-    NT_func_return_type => Shift(yy_state_1132)
-    T_EQUAL | T_SEMI | T_RBRACE => Reduce(0, NT_func_return_type, yy_action_850)
-    _ => Error
-  }
+  ReduceNoLookahead(1, NT_wildcard, yy_action_260)
 }
 
 ///|
 fn yy_state_1132(_lookahead : YYSymbol) -> YYDecision {
-  match _lookahead {
-    T_EQUAL => Shift(yy_state_1121)
-    NT_option_preceded_EQUAL_wildcard__ => Shift(yy_state_1133)
-    T_SEMI | T_RBRACE =>
-      Reduce(0, NT_option_preceded_EQUAL_wildcard__, yy_action_253)
-    _ => Error
-  }
+  ReduceNoLookahead(9, NT_trait_method_decl, yy_action_259)
 }
 
 ///|
 fn yy_state_1133(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(10, NT_trait_method_decl, yy_action_248)
+  match _lookahead {
+    T_LIDENT => Shift(yy_state_1134)
+    _ => Error
+  }
 }
 
 ///|
 fn yy_state_1134(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_EXCLAMATION => Shift(yy_state_726)
+    T_EXCLAMATION => Shift(yy_state_734)
     NT_optional_bang => Shift(yy_state_1135)
-    T_LPAREN | T_LBRACKET => Reduce(0, NT_optional_bang, yy_action_851)
+    T_LPAREN | T_LBRACKET => Reduce(0, NT_optional_bang, yy_action_863)
     _ => Error
   }
 }
@@ -45189,11 +46040,11 @@ fn yy_state_1134(_lookahead : YYSymbol) -> YYDecision {
 ///|
 fn yy_state_1135(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_type_parameters => Shift(yy_state_895)
-    NT_option_type_parameters_ => Shift(yy_state_935)
-    T_LBRACKET => Shift(yy_state_936)
+    NT_type_parameters => Shift(yy_state_903)
+    NT_option_type_parameters_ => Shift(yy_state_943)
+    T_LBRACKET => Shift(yy_state_944)
     NT_optional_type_parameters => Shift(yy_state_1136)
-    T_LPAREN => Reduce(0, NT_option_type_parameters_, yy_action_356)
+    T_LPAREN => Reduce(0, NT_option_type_parameters_, yy_action_366)
     _ => Error
   }
 }
@@ -45216,14 +46067,14 @@ fn yy_state_1137(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_trait_method_param => Shift(yy_state_1102)
-    NT_non_empty_list_commas_rev_trait_method_param_ => Shift(yy_state_1103)
-    T_POST_LABEL => Shift(yy_state_1107)
-    T_LIDENT => Shift(yy_state_1110)
-    NT_type_ => Shift(yy_state_1116)
-    NT_non_empty_list_commas_trait_method_param_ => Shift(yy_state_1117)
+    NT_trait_method_param => Shift(yy_state_1110)
+    NT_non_empty_list_commas_rev_trait_method_param_ => Shift(yy_state_1111)
+    T_POST_LABEL => Shift(yy_state_1115)
+    T_LIDENT => Shift(yy_state_1118)
+    NT_type_ => Shift(yy_state_1124)
+    NT_non_empty_list_commas_trait_method_param_ => Shift(yy_state_1125)
     NT_list_commas_trait_method_param_ => Shift(yy_state_1138)
-    T_RPAREN => Reduce(0, NT_list_commas_trait_method_param_, yy_action_262)
+    T_RPAREN => Reduce(0, NT_list_commas_trait_method_param_, yy_action_272)
     _ => Error
   }
 }
@@ -45244,7 +46095,7 @@ fn yy_state_1139(_lookahead : YYSymbol) -> YYDecision {
     T_NORAISE => Shift(yy_state_83)
     T_RAISE => Shift(yy_state_84)
     NT_func_return_type => Shift(yy_state_1140)
-    T_EQUAL | T_SEMI | T_RBRACE => Reduce(0, NT_func_return_type, yy_action_850)
+    T_EQUAL | T_SEMI | T_RBRACE => Reduce(0, NT_func_return_type, yy_action_862)
     _ => Error
   }
 }
@@ -45252,23 +46103,25 @@ fn yy_state_1139(_lookahead : YYSymbol) -> YYDecision {
 ///|
 fn yy_state_1140(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_EQUAL => Shift(yy_state_1121)
+    T_EQUAL => Shift(yy_state_1129)
     NT_option_preceded_EQUAL_wildcard__ => Shift(yy_state_1141)
     T_SEMI | T_RBRACE =>
-      Reduce(0, NT_option_preceded_EQUAL_wildcard__, yy_action_253)
+      Reduce(0, NT_option_preceded_EQUAL_wildcard__, yy_action_263)
     _ => Error
   }
 }
 
 ///|
 fn yy_state_1141(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(8, NT_trait_method_decl, yy_action_247)
+  ReduceNoLookahead(10, NT_trait_method_decl, yy_action_258)
 }
 
 ///|
 fn yy_state_1142(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LIDENT => Shift(yy_state_1143)
+    T_EXCLAMATION => Shift(yy_state_734)
+    NT_optional_bang => Shift(yy_state_1143)
+    T_LPAREN | T_LBRACKET => Reduce(0, NT_optional_bang, yy_action_863)
     _ => Error
   }
 }
@@ -45276,9 +46129,11 @@ fn yy_state_1142(_lookahead : YYSymbol) -> YYDecision {
 ///|
 fn yy_state_1143(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_EXCLAMATION => Shift(yy_state_726)
-    NT_optional_bang => Shift(yy_state_1144)
-    T_LPAREN | T_LBRACKET => Reduce(0, NT_optional_bang, yy_action_851)
+    NT_type_parameters => Shift(yy_state_903)
+    NT_option_type_parameters_ => Shift(yy_state_943)
+    T_LBRACKET => Shift(yy_state_944)
+    NT_optional_type_parameters => Shift(yy_state_1144)
+    T_LPAREN => Reduce(0, NT_option_type_parameters_, yy_action_366)
     _ => Error
   }
 }
@@ -45286,25 +46141,13 @@ fn yy_state_1143(_lookahead : YYSymbol) -> YYDecision {
 ///|
 fn yy_state_1144(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_type_parameters => Shift(yy_state_895)
-    NT_option_type_parameters_ => Shift(yy_state_935)
-    T_LBRACKET => Shift(yy_state_936)
-    NT_optional_type_parameters => Shift(yy_state_1145)
-    T_LPAREN => Reduce(0, NT_option_type_parameters_, yy_action_356)
+    T_LPAREN => Shift(yy_state_1145)
     _ => Error
   }
 }
 
 ///|
 fn yy_state_1145(_lookahead : YYSymbol) -> YYDecision {
-  match _lookahead {
-    T_LPAREN => Shift(yy_state_1146)
-    _ => Error
-  }
-}
-
-///|
-fn yy_state_1146(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -45313,85 +46156,111 @@ fn yy_state_1146(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_trait_method_param => Shift(yy_state_1102)
-    NT_non_empty_list_commas_rev_trait_method_param_ => Shift(yy_state_1103)
-    T_POST_LABEL => Shift(yy_state_1107)
-    T_LIDENT => Shift(yy_state_1110)
-    NT_type_ => Shift(yy_state_1116)
-    NT_non_empty_list_commas_trait_method_param_ => Shift(yy_state_1117)
-    NT_list_commas_trait_method_param_ => Shift(yy_state_1147)
-    T_RPAREN => Reduce(0, NT_list_commas_trait_method_param_, yy_action_262)
+    NT_trait_method_param => Shift(yy_state_1110)
+    NT_non_empty_list_commas_rev_trait_method_param_ => Shift(yy_state_1111)
+    T_POST_LABEL => Shift(yy_state_1115)
+    T_LIDENT => Shift(yy_state_1118)
+    NT_type_ => Shift(yy_state_1124)
+    NT_non_empty_list_commas_trait_method_param_ => Shift(yy_state_1125)
+    NT_list_commas_trait_method_param_ => Shift(yy_state_1146)
+    T_RPAREN => Reduce(0, NT_list_commas_trait_method_param_, yy_action_272)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1147(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1146(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RPAREN => Shift(yy_state_1148)
+    T_RPAREN => Shift(yy_state_1147)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1148(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1147(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_error_annotation => Shift(yy_state_50)
     T_THIN_ARROW => Shift(yy_state_51)
     T_NORAISE => Shift(yy_state_83)
     T_RAISE => Shift(yy_state_84)
-    NT_func_return_type => Shift(yy_state_1149)
-    T_EQUAL | T_SEMI | T_RBRACE => Reduce(0, NT_func_return_type, yy_action_850)
+    NT_func_return_type => Shift(yy_state_1148)
+    T_EQUAL | T_SEMI | T_RBRACE => Reduce(0, NT_func_return_type, yy_action_862)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1149(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1148(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_EQUAL => Shift(yy_state_1121)
-    NT_option_preceded_EQUAL_wildcard__ => Shift(yy_state_1150)
+    T_EQUAL => Shift(yy_state_1129)
+    NT_option_preceded_EQUAL_wildcard__ => Shift(yy_state_1149)
     T_SEMI | T_RBRACE =>
-      Reduce(0, NT_option_preceded_EQUAL_wildcard__, yy_action_253)
+      Reduce(0, NT_option_preceded_EQUAL_wildcard__, yy_action_263)
     _ => Error
   }
 }
 
+///|
+fn yy_state_1149(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(8, NT_trait_method_decl, yy_action_257)
+}
+
 ///|
 fn yy_state_1150(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(9, NT_trait_method_decl, yy_action_246)
+  match _lookahead {
+    T_LIDENT => Shift(yy_state_1151)
+    _ => Error
+  }
 }
 
 ///|
 fn yy_state_1151(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_list_semis_trait_method_decl_, yy_action_245)
+  match _lookahead {
+    T_EXCLAMATION => Shift(yy_state_734)
+    NT_optional_bang => Shift(yy_state_1152)
+    T_LPAREN | T_LBRACKET => Reduce(0, NT_optional_bang, yy_action_863)
+    _ => Error
+  }
 }
 
 ///|
 fn yy_state_1152(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RBRACE => Shift(yy_state_1153)
+    NT_type_parameters => Shift(yy_state_903)
+    NT_option_type_parameters_ => Shift(yy_state_943)
+    T_LBRACKET => Shift(yy_state_944)
+    NT_optional_type_parameters => Shift(yy_state_1153)
+    T_LPAREN => Reduce(0, NT_option_type_parameters_, yy_action_366)
     _ => Error
   }
 }
 
 ///|
 fn yy_state_1153(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(6, NT_structure_item, yy_action_244)
+  match _lookahead {
+    T_LPAREN => Shift(yy_state_1154)
+    _ => Error
+  }
 }
 
 ///|
 fn yy_state_1154(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1155)
-    T_LIDENT => Shift(yy_state_1157)
-    NT_option_func_alias_type_name_LIDENT_UIDENT__ => Shift(yy_state_1162)
-    T_PACKAGE_NAME => Shift(yy_state_1172)
-    NT_func_alias_type_name_LIDENT_UIDENT_ => Shift(yy_state_1187)
-    NT_func_alias_target_LIDENT_ => Shift(yy_state_1189)
-    NT_func_alias_targets => Shift(yy_state_1190)
-    T_LPAREN =>
-      Reduce(0, NT_option_func_alias_type_name_LIDENT_UIDENT__, yy_action_243)
+    T_ASYNC => Shift(yy_state_52)
+    T_UNDERSCORE => Shift(yy_state_57)
+    T_AMPER => Shift(yy_state_58)
+    T_PACKAGE_NAME => Shift(yy_state_60)
+    T_UIDENT => Shift(yy_state_67)
+    T_LPAREN => Shift(yy_state_71)
+    NT_simple_type => Shift(yy_state_100)
+    NT_trait_method_param => Shift(yy_state_1110)
+    NT_non_empty_list_commas_rev_trait_method_param_ => Shift(yy_state_1111)
+    T_POST_LABEL => Shift(yy_state_1115)
+    T_LIDENT => Shift(yy_state_1118)
+    NT_type_ => Shift(yy_state_1124)
+    NT_non_empty_list_commas_trait_method_param_ => Shift(yy_state_1125)
+    NT_list_commas_trait_method_param_ => Shift(yy_state_1155)
+    T_RPAREN => Reduce(0, NT_list_commas_trait_method_param_, yy_action_272)
     _ => Error
   }
 }
@@ -45399,54 +46268,70 @@ fn yy_state_1154(_lookahead : YYSymbol) -> YYDecision {
 ///|
 fn yy_state_1155(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLONCOLON => Shift(yy_state_1156)
+    T_RPAREN => Shift(yy_state_1156)
     _ => Error
   }
 }
 
 ///|
 fn yy_state_1156(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_func_alias_type_name_LIDENT_UIDENT_, yy_action_242)
+  match _lookahead {
+    NT_error_annotation => Shift(yy_state_50)
+    T_THIN_ARROW => Shift(yy_state_51)
+    T_NORAISE => Shift(yy_state_83)
+    T_RAISE => Shift(yy_state_84)
+    NT_func_return_type => Shift(yy_state_1157)
+    T_EQUAL | T_SEMI | T_RBRACE => Reduce(0, NT_func_return_type, yy_action_862)
+    _ => Error
+  }
 }
 
 ///|
 fn yy_state_1157(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_AS => Shift(yy_state_1158)
-    NT_option_preceded_AS_binder__ => Shift(yy_state_1160)
-    T_COLONCOLON => Shift(yy_state_1161)
-    T_EOF | T_SEMI => Reduce(0, NT_option_preceded_AS_binder__, yy_action_241)
+    T_EQUAL => Shift(yy_state_1129)
+    NT_option_preceded_EQUAL_wildcard__ => Shift(yy_state_1158)
+    T_SEMI | T_RBRACE =>
+      Reduce(0, NT_option_preceded_EQUAL_wildcard__, yy_action_263)
     _ => Error
   }
 }
 
 ///|
 fn yy_state_1158(_lookahead : YYSymbol) -> YYDecision {
-  match _lookahead {
-    T_LIDENT => Shift(yy_state_1159)
-    _ => Error
-  }
+  ReduceNoLookahead(9, NT_trait_method_decl, yy_action_256)
 }
 
 ///|
 fn yy_state_1159(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_option_preceded_AS_binder__, yy_action_239)
+  ReduceNoLookahead(1, NT_list_semis_trait_method_decl_, yy_action_255)
 }
 
 ///|
 fn yy_state_1160(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_func_alias_target_LIDENT_, yy_action_238)
+  match _lookahead {
+    T_RBRACE => Shift(yy_state_1161)
+    _ => Error
+  }
 }
 
 ///|
 fn yy_state_1161(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_func_alias_type_name_LIDENT_UIDENT_, yy_action_237)
+  ReduceNoLookahead(6, NT_structure_item, yy_action_254)
 }
 
 ///|
 fn yy_state_1162(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LPAREN => Shift(yy_state_1163)
+    T_UIDENT => Shift(yy_state_1163)
+    T_LIDENT => Shift(yy_state_1165)
+    NT_option_func_alias_type_name_LIDENT_UIDENT__ => Shift(yy_state_1170)
+    T_PACKAGE_NAME => Shift(yy_state_1180)
+    NT_func_alias_type_name_LIDENT_UIDENT_ => Shift(yy_state_1195)
+    NT_func_alias_target_LIDENT_ => Shift(yy_state_1197)
+    NT_func_alias_targets => Shift(yy_state_1198)
+    T_LPAREN =>
+      Reduce(0, NT_option_func_alias_type_name_LIDENT_UIDENT__, yy_action_253)
     _ => Error
   }
 }
@@ -45454,348 +46339,403 @@ fn yy_state_1162(_lookahead : YYSymbol) -> YYDecision {
 ///|
 fn yy_state_1163(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_func_alias_target_LIDENT_ => Shift(yy_state_1164)
-    NT_non_empty_list_commas_rev_func_alias_target_LIDENT__ =>
-      Shift(yy_state_1165)
-    T_LIDENT => Shift(yy_state_1168)
-    NT_non_empty_list_commas_func_alias_target_LIDENT__ => Shift(yy_state_1170)
+    T_COLONCOLON => Shift(yy_state_1164)
     _ => Error
   }
 }
 
 ///|
 fn yy_state_1164(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(2, NT_func_alias_type_name_LIDENT_UIDENT_, yy_action_252)
+}
+
+///|
+fn yy_state_1165(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_AS => Shift(yy_state_1166)
+    NT_option_preceded_AS_binder__ => Shift(yy_state_1168)
+    T_COLONCOLON => Shift(yy_state_1169)
+    T_EOF | T_SEMI => Reduce(0, NT_option_preceded_AS_binder__, yy_action_251)
+    _ => Error
+  }
+}
+
+///|
+fn yy_state_1166(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_LIDENT => Shift(yy_state_1167)
+    _ => Error
+  }
+}
+
+///|
+fn yy_state_1167(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(2, NT_option_preceded_AS_binder__, yy_action_249)
+}
+
+///|
+fn yy_state_1168(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(2, NT_func_alias_target_LIDENT_, yy_action_248)
+}
+
+///|
+fn yy_state_1169(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(2, NT_func_alias_type_name_LIDENT_UIDENT_, yy_action_247)
+}
+
+///|
+fn yy_state_1170(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_LPAREN => Shift(yy_state_1171)
+    _ => Error
+  }
+}
+
+///|
+fn yy_state_1171(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    NT_func_alias_target_LIDENT_ => Shift(yy_state_1172)
+    NT_non_empty_list_commas_rev_func_alias_target_LIDENT__ =>
+      Shift(yy_state_1173)
+    T_LIDENT => Shift(yy_state_1176)
+    NT_non_empty_list_commas_func_alias_target_LIDENT__ => Shift(yy_state_1178)
+    _ => Error
+  }
+}
+
+///|
+fn yy_state_1172(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(
     1,
     NT_non_empty_list_commas_rev_func_alias_target_LIDENT__,
-    yy_action_236,
+    yy_action_246,
   )
 }
 
 ///|
-fn yy_state_1165(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1173(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COMMA => Shift(yy_state_1166)
-    NT_option_COMMA_ => Shift(yy_state_1169)
-    T_RPAREN => Reduce(0, NT_option_COMMA_, yy_action_865)
+    T_COMMA => Shift(yy_state_1174)
+    NT_option_COMMA_ => Shift(yy_state_1177)
+    T_RPAREN => Reduce(0, NT_option_COMMA_, yy_action_877)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1166(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1174(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_func_alias_target_LIDENT_ => Shift(yy_state_1167)
-    T_LIDENT => Shift(yy_state_1168)
-    T_RPAREN => Reduce(1, NT_option_COMMA_, yy_action_863)
+    NT_func_alias_target_LIDENT_ => Shift(yy_state_1175)
+    T_LIDENT => Shift(yy_state_1176)
+    T_RPAREN => Reduce(1, NT_option_COMMA_, yy_action_875)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1167(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1175(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(
     3,
     NT_non_empty_list_commas_rev_func_alias_target_LIDENT__,
-    yy_action_235,
+    yy_action_245,
   )
 }
 
 ///|
-fn yy_state_1168(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1176(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_AS => Shift(yy_state_1158)
-    NT_option_preceded_AS_binder__ => Shift(yy_state_1160)
+    T_AS => Shift(yy_state_1166)
+    NT_option_preceded_AS_binder__ => Shift(yy_state_1168)
     T_EOF | T_RPAREN | T_COMMA | T_SEMI =>
-      Reduce(0, NT_option_preceded_AS_binder__, yy_action_241)
+      Reduce(0, NT_option_preceded_AS_binder__, yy_action_251)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1169(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1177(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(
     2,
     NT_non_empty_list_commas_func_alias_target_LIDENT__,
-    yy_action_234,
+    yy_action_244,
   )
 }
 
 ///|
-fn yy_state_1170(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1178(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RPAREN => Shift(yy_state_1171)
+    T_RPAREN => Shift(yy_state_1179)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1171(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(4, NT_func_alias_targets, yy_action_233)
+fn yy_state_1179(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(4, NT_func_alias_targets, yy_action_243)
 }
 
 ///|
-fn yy_state_1172(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1180(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_DOT_UIDENT => Shift(yy_state_1173)
-    T_DOT_LIDENT => Shift(yy_state_1175)
-    T_DOT_LPAREN => Shift(yy_state_1178)
-    NT_func_alias_type_name_DOT_LIDENT_DOT_UIDENT_ => Shift(yy_state_1181)
-    NT_func_alias_target_DOT_LIDENT_ => Shift(yy_state_1186)
+    T_DOT_UIDENT => Shift(yy_state_1181)
+    T_DOT_LIDENT => Shift(yy_state_1183)
+    T_DOT_LPAREN => Shift(yy_state_1186)
+    NT_func_alias_type_name_DOT_LIDENT_DOT_UIDENT_ => Shift(yy_state_1189)
+    NT_func_alias_target_DOT_LIDENT_ => Shift(yy_state_1194)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1173(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1181(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLONCOLON => Shift(yy_state_1174)
+    T_COLONCOLON => Shift(yy_state_1182)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1174(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1182(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(
     2,
     NT_func_alias_type_name_DOT_LIDENT_DOT_UIDENT_,
-    yy_action_232,
+    yy_action_242,
   )
 }
 
 ///|
-fn yy_state_1175(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1183(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_AS => Shift(yy_state_1158)
-    T_COLONCOLON => Shift(yy_state_1176)
-    NT_option_preceded_AS_binder__ => Shift(yy_state_1177)
-    T_EOF | T_SEMI => Reduce(0, NT_option_preceded_AS_binder__, yy_action_241)
+    T_AS => Shift(yy_state_1166)
+    T_COLONCOLON => Shift(yy_state_1184)
+    NT_option_preceded_AS_binder__ => Shift(yy_state_1185)
+    T_EOF | T_SEMI => Reduce(0, NT_option_preceded_AS_binder__, yy_action_251)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1176(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1184(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(
     2,
     NT_func_alias_type_name_DOT_LIDENT_DOT_UIDENT_,
-    yy_action_231,
+    yy_action_241,
   )
 }
 
 ///|
-fn yy_state_1177(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_func_alias_target_DOT_LIDENT_, yy_action_230)
+fn yy_state_1185(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(2, NT_func_alias_target_DOT_LIDENT_, yy_action_240)
 }
 
 ///|
-fn yy_state_1178(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1186(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_func_alias_target_LIDENT_ => Shift(yy_state_1164)
+    NT_func_alias_target_LIDENT_ => Shift(yy_state_1172)
     NT_non_empty_list_commas_rev_func_alias_target_LIDENT__ =>
-      Shift(yy_state_1165)
-    T_LIDENT => Shift(yy_state_1168)
-    NT_non_empty_list_commas_func_alias_target_LIDENT__ => Shift(yy_state_1179)
+      Shift(yy_state_1173)
+    T_LIDENT => Shift(yy_state_1176)
+    NT_non_empty_list_commas_func_alias_target_LIDENT__ => Shift(yy_state_1187)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1179(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1187(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RPAREN => Shift(yy_state_1180)
+    T_RPAREN => Shift(yy_state_1188)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1180(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(4, NT_func_alias_targets, yy_action_229)
+fn yy_state_1188(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(4, NT_func_alias_targets, yy_action_239)
 }
 
 ///|
-fn yy_state_1181(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1189(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LIDENT => Shift(yy_state_1168)
-    T_LPAREN => Shift(yy_state_1182)
-    NT_func_alias_target_LIDENT_ => Shift(yy_state_1185)
+    T_LIDENT => Shift(yy_state_1176)
+    T_LPAREN => Shift(yy_state_1190)
+    NT_func_alias_target_LIDENT_ => Shift(yy_state_1193)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1182(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1190(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_func_alias_target_LIDENT_ => Shift(yy_state_1164)
+    NT_func_alias_target_LIDENT_ => Shift(yy_state_1172)
     NT_non_empty_list_commas_rev_func_alias_target_LIDENT__ =>
-      Shift(yy_state_1165)
-    T_LIDENT => Shift(yy_state_1168)
-    NT_non_empty_list_commas_func_alias_target_LIDENT__ => Shift(yy_state_1183)
+      Shift(yy_state_1173)
+    T_LIDENT => Shift(yy_state_1176)
+    NT_non_empty_list_commas_func_alias_target_LIDENT__ => Shift(yy_state_1191)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1183(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1191(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RPAREN => Shift(yy_state_1184)
+    T_RPAREN => Shift(yy_state_1192)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1184(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(5, NT_func_alias_targets, yy_action_228)
+fn yy_state_1192(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(5, NT_func_alias_targets, yy_action_238)
 }
 
 ///|
-fn yy_state_1185(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_func_alias_targets, yy_action_227)
+fn yy_state_1193(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(3, NT_func_alias_targets, yy_action_237)
 }
 
 ///|
-fn yy_state_1186(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_func_alias_targets, yy_action_226)
+fn yy_state_1194(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(2, NT_func_alias_targets, yy_action_236)
 }
 
 ///|
-fn yy_state_1187(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1195(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LIDENT => Shift(yy_state_1168)
-    NT_func_alias_target_LIDENT_ => Shift(yy_state_1188)
+    T_LIDENT => Shift(yy_state_1176)
+    NT_func_alias_target_LIDENT_ => Shift(yy_state_1196)
     T_LPAREN =>
-      Reduce(1, NT_option_func_alias_type_name_LIDENT_UIDENT__, yy_action_225)
+      Reduce(1, NT_option_func_alias_type_name_LIDENT_UIDENT__, yy_action_235)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1188(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_func_alias_targets, yy_action_223)
+fn yy_state_1196(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(2, NT_func_alias_targets, yy_action_233)
 }
 
 ///|
-fn yy_state_1189(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_func_alias_targets, yy_action_221)
+fn yy_state_1197(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_func_alias_targets, yy_action_231)
 }
 
 ///|
-fn yy_state_1190(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_structure_item, yy_action_220)
+fn yy_state_1198(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(2, NT_structure_item, yy_action_230)
 }
 
 ///|
-fn yy_state_1191(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(1, NT_structure_item, yy_action_219)
+fn yy_state_1199(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(1, NT_structure_item, yy_action_229)
 }
 
 ///|
-fn yy_state_1192(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1200(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACE => Shift(yy_state_963)
-    NT_block_expr_with_local_types => Shift(yy_state_1193)
-    T_EQUAL => Shift(yy_state_1194)
+    T_LBRACE => Shift(yy_state_971)
+    NT_block_expr_with_local_types => Shift(yy_state_1201)
+    T_EQUAL => Shift(yy_state_1202)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1193(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_structure_item, yy_action_218)
+fn yy_state_1201(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(2, NT_structure_item, yy_action_228)
 }
 
 ///|
-fn yy_state_1194(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1202(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_MULTILINE_STRING => Shift(yy_state_1195)
-    NT_non_empty_list_MULTILINE_STRING_ => Shift(yy_state_1197)
-    T_STRING => Shift(yy_state_1198)
+    T_MULTILINE_STRING => Shift(yy_state_1203)
+    NT_non_empty_list_MULTILINE_STRING_ => Shift(yy_state_1205)
+    T_STRING => Shift(yy_state_1206)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1195(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1203(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_MULTILINE_STRING => Shift(yy_state_1195)
-    NT_non_empty_list_MULTILINE_STRING_ => Shift(yy_state_1196)
+    T_MULTILINE_STRING => Shift(yy_state_1203)
+    NT_non_empty_list_MULTILINE_STRING_ => Shift(yy_state_1204)
     T_EOF | T_SEMI =>
-      Reduce(1, NT_non_empty_list_MULTILINE_STRING_, yy_action_217)
+      Reduce(1, NT_non_empty_list_MULTILINE_STRING_, yy_action_227)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1196(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(2, NT_non_empty_list_MULTILINE_STRING_, yy_action_216)
+fn yy_state_1204(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(2, NT_non_empty_list_MULTILINE_STRING_, yy_action_226)
 }
 
 ///|
-fn yy_state_1197(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_structure_item, yy_action_215)
+fn yy_state_1205(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(3, NT_structure_item, yy_action_225)
 }
 
 ///|
-fn yy_state_1198(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1206(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_STRING => Shift(yy_state_1199)
-    T_EOF | T_SEMI => Reduce(3, NT_structure_item, yy_action_214)
+    T_STRING => Shift(yy_state_1207)
+    T_EOF | T_SEMI => Reduce(3, NT_structure_item, yy_action_224)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1199(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(4, NT_structure_item, yy_action_213)
+fn yy_state_1207(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(4, NT_structure_item, yy_action_223)
 }
 
 ///|
-fn yy_state_1200(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1208(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_EQUAL => Shift(yy_state_1201)
+    T_EQUAL => Shift(yy_state_1209)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1201(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1209(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_MULTILINE_STRING => Shift(yy_state_1195)
-    NT_non_empty_list_MULTILINE_STRING_ => Shift(yy_state_1202)
-    T_STRING => Shift(yy_state_1203)
+    T_MULTILINE_STRING => Shift(yy_state_1203)
+    NT_non_empty_list_MULTILINE_STRING_ => Shift(yy_state_1210)
+    T_STRING => Shift(yy_state_1211)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1202(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_structure_item, yy_action_212)
+fn yy_state_1210(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(3, NT_structure_item, yy_action_222)
 }
 
 ///|
-fn yy_state_1203(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1211(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_STRING => Shift(yy_state_1204)
-    T_EOF | T_SEMI => Reduce(3, NT_structure_item, yy_action_211)
+    T_STRING => Shift(yy_state_1212)
+    T_EOF | T_SEMI => Reduce(3, NT_structure_item, yy_action_221)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1204(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(4, NT_structure_item, yy_action_210)
+fn yy_state_1212(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(4, NT_structure_item, yy_action_220)
 }
 
 ///|
-fn yy_state_1205(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1213(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_EQUAL => Shift(yy_state_1206)
+    T_EQUAL => Shift(yy_state_1214)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1206(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1214(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_multiline_string => Shift(yy_state_2)
     T_MULTILINE_INTERP => Shift(yy_state_4)
@@ -45849,82 +46789,82 @@ fn yy_state_1206(_lookahead : YYSymbol) -> YYDecision {
     NT_loop_expr => Shift(yy_state_472)
     T_LEXMATCH => Shift(yy_state_473)
     NT_lexmatch_header => Shift(yy_state_479)
-    NT_match_header => Shift(yy_state_488)
-    T_MATCH => Shift(yy_state_492)
-    T_IF => Shift(yy_state_495)
-    T_TRY_EXCLAMATION => Shift(yy_state_501)
-    T_TRY_QUESTION => Shift(yy_state_503)
-    T_TRY => Shift(yy_state_505)
-    NT_loop_label_colon => Shift(yy_state_520)
-    T_POST_LABEL => Shift(yy_state_528)
-    T_LIDENT => Shift(yy_state_530)
-    NT_expr => Shift(yy_state_1207)
-    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_890)
+    NT_match_header => Shift(yy_state_490)
+    T_MATCH => Shift(yy_state_494)
+    T_IF => Shift(yy_state_497)
+    T_TRY_EXCLAMATION => Shift(yy_state_503)
+    T_TRY_QUESTION => Shift(yy_state_505)
+    T_TRY => Shift(yy_state_507)
+    NT_loop_label_colon => Shift(yy_state_522)
+    T_POST_LABEL => Shift(yy_state_530)
+    T_LIDENT => Shift(yy_state_532)
+    NT_expr => Shift(yy_state_1215)
+    T_WHILE | T_LOOP | T_FOR => Reduce(0, NT_loop_label_colon, yy_action_902)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1207(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(3, NT_structure_item, yy_action_209)
+fn yy_state_1215(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(3, NT_structure_item, yy_action_219)
 }
 
 ///|
-fn yy_state_1208(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1216(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACE => Shift(yy_state_1209)
+    T_LBRACE => Shift(yy_state_1217)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1209(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1217(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_ATTRIBUTE => Shift(yy_state_845)
-    NT_enum_constructor => Shift(yy_state_899)
-    NT_non_empty_list_attribute_ => Shift(yy_state_903)
-    T_UIDENT => Shift(yy_state_923)
-    NT_non_empty_list_semis_enum_constructor_ => Shift(yy_state_926)
-    NT_list_semis_enum_constructor_ => Shift(yy_state_1210)
-    T_RBRACE => Reduce(0, NT_list_semis_enum_constructor_, yy_action_354)
+    T_ATTRIBUTE => Shift(yy_state_853)
+    NT_enum_constructor => Shift(yy_state_907)
+    NT_non_empty_list_attribute_ => Shift(yy_state_911)
+    T_UIDENT => Shift(yy_state_931)
+    NT_non_empty_list_semis_enum_constructor_ => Shift(yy_state_934)
+    NT_list_semis_enum_constructor_ => Shift(yy_state_1218)
+    T_RBRACE => Reduce(0, NT_list_semis_enum_constructor_, yy_action_364)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1210(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1218(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RBRACE => Shift(yy_state_1211)
+    T_RBRACE => Shift(yy_state_1219)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1211(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1219(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_DERIVE => Shift(yy_state_973)
-    NT_deriving_directive_list => Shift(yy_state_1212)
-    T_EOF | T_SEMI => Reduce(0, NT_deriving_directive_list, yy_action_315)
+    T_DERIVE => Shift(yy_state_981)
+    NT_deriving_directive_list => Shift(yy_state_1220)
+    T_EOF | T_SEMI => Reduce(0, NT_deriving_directive_list, yy_action_325)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1212(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(5, NT_structure_item, yy_action_208)
+fn yy_state_1220(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(5, NT_structure_item, yy_action_218)
 }
 
 ///|
-fn yy_state_1213(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1221(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LPAREN => Shift(yy_state_1214)
-    T_LBRACE => Shift(yy_state_1218)
+    T_LPAREN => Shift(yy_state_1222)
+    T_LBRACE => Shift(yy_state_1226)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1214(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1222(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -45935,77 +46875,496 @@ fn yy_state_1214(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_non_empty_list_commas_type__ => Shift(yy_state_1215)
+    NT_non_empty_list_commas_type__ => Shift(yy_state_1223)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1215(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1223(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RPAREN => Shift(yy_state_1216)
+    T_RPAREN => Shift(yy_state_1224)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1216(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1224(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_DERIVE => Shift(yy_state_973)
-    NT_deriving_directive_list => Shift(yy_state_1217)
-    T_EOF | T_SEMI => Reduce(0, NT_deriving_directive_list, yy_action_315)
+    T_DERIVE => Shift(yy_state_981)
+    NT_deriving_directive_list => Shift(yy_state_1225)
+    T_EOF | T_SEMI => Reduce(0, NT_deriving_directive_list, yy_action_325)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1217(_lookahead : YYSymbol) -> YYDecision {
-  ReduceNoLookahead(5, NT_structure_item, yy_action_207)
+fn yy_state_1225(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(5, NT_structure_item, yy_action_217)
 }
 
 ///|
-fn yy_state_1218(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1226(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_ATTRIBUTE => Shift(yy_state_845)
-    T_MUTABLE => Shift(yy_state_913)
-    NT_record_decl_field => Shift(yy_state_1001)
-    NT_non_empty_list_attribute_ => Shift(yy_state_1005)
-    T_PUB => Shift(yy_state_1026)
-    T_PRIV => Shift(yy_state_1032)
-    NT_option_MUTABLE_ => Shift(yy_state_1037)
-    NT_non_empty_list_semis_record_decl_field_ => Shift(yy_state_1041)
-    NT_list_semis_record_decl_field_ => Shift(yy_state_1219)
-    T_RBRACE => Reduce(0, NT_list_semis_record_decl_field_, yy_action_303)
-    T_LIDENT => Reduce(0, NT_option_MUTABLE_, yy_action_350)
+    T_ATTRIBUTE => Shift(yy_state_853)
+    T_MUTABLE => Shift(yy_state_921)
+    T_PUB => Shift(yy_state_1034)
+    T_PRIV => Shift(yy_state_1040)
+    NT_option_MUTABLE_ => Shift(yy_state_1045)
+    NT_record_decl_field => Shift(yy_state_1227)
+    NT_non_empty_list_semi_rev_aux_record_decl_field_ => Shift(yy_state_1228)
+    T_FN => Shift(yy_state_1234)
+    T_ASYNC => Shift(yy_state_1241)
+    NT_non_empty_list_attribute_ => Shift(yy_state_1249)
+    NT_record_constr_decl => Shift(yy_state_1265)
+    NT_record_decl_body => Shift(yy_state_1267)
+    T_RBRACE => Reduce(0, NT_record_decl_body, yy_action_216)
+    T_LIDENT => Reduce(0, NT_option_MUTABLE_, yy_action_360)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1219(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1227(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(
+    1,
+    NT_non_empty_list_semi_rev_aux_record_decl_field_,
+    yy_action_215,
+  )
+}
+
+///|
+fn yy_state_1228(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RBRACE => Shift(yy_state_1220)
+    NT_option_SEMI_ => Shift(yy_state_1229)
+    T_SEMI => Shift(yy_state_1230)
+    T_RBRACE => Reduce(0, NT_option_SEMI_, yy_action_812)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1220(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1229(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(2, NT_record_decl_body, yy_action_214)
+}
+
+///|
+fn yy_state_1230(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_DERIVE => Shift(yy_state_973)
-    NT_deriving_directive_list => Shift(yy_state_1221)
-    T_EOF | T_SEMI => Reduce(0, NT_deriving_directive_list, yy_action_315)
+    T_ATTRIBUTE => Shift(yy_state_853)
+    T_MUTABLE => Shift(yy_state_921)
+    T_PUB => Shift(yy_state_1034)
+    T_PRIV => Shift(yy_state_1040)
+    NT_option_MUTABLE_ => Shift(yy_state_1045)
+    NT_record_decl_field => Shift(yy_state_1231)
+    NT_record_constr_decl => Shift(yy_state_1232)
+    T_FN => Shift(yy_state_1234)
+    T_ASYNC => Shift(yy_state_1241)
+    NT_non_empty_list_attribute_ => Shift(yy_state_1249)
+    T_LIDENT => Reduce(0, NT_option_MUTABLE_, yy_action_360)
+    T_RBRACE => Reduce(1, NT_option_SEMI_, yy_action_810)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1221(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1231(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(
+    3,
+    NT_non_empty_list_semi_rev_aux_record_decl_field_,
+    yy_action_213,
+  )
+}
+
+///|
+fn yy_state_1232(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_SEMI => Shift(yy_state_230)
+    NT_option_SEMI_ => Shift(yy_state_1233)
+    T_RBRACE => Reduce(0, NT_option_SEMI_, yy_action_812)
+    _ => Error
+  }
+}
+
+///|
+fn yy_state_1233(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(4, NT_record_decl_body, yy_action_212)
+}
+
+///|
+fn yy_state_1234(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    NT_type_parameters => Shift(yy_state_903)
+    NT_option_type_parameters_ => Shift(yy_state_943)
+    T_LBRACKET => Shift(yy_state_944)
+    NT_optional_type_parameters => Shift(yy_state_1235)
+    T_LIDENT => Reduce(0, NT_option_type_parameters_, yy_action_366)
+    _ => Error
+  }
+}
+
+///|
+fn yy_state_1235(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_LIDENT => Shift(yy_state_1236)
+    _ => Error
+  }
+}
+
+///|
+fn yy_state_1236(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_LPAREN => Shift(yy_state_1237)
+    _ => Error
+  }
+}
+
+///|
+fn yy_state_1237(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_ASYNC => Shift(yy_state_52)
+    T_UNDERSCORE => Shift(yy_state_57)
+    T_AMPER => Shift(yy_state_58)
+    T_PACKAGE_NAME => Shift(yy_state_60)
+    T_UIDENT => Shift(yy_state_67)
+    T_LPAREN => Shift(yy_state_71)
+    NT_simple_type => Shift(yy_state_100)
+    NT_trait_method_param => Shift(yy_state_1110)
+    NT_non_empty_list_commas_rev_trait_method_param_ => Shift(yy_state_1111)
+    T_POST_LABEL => Shift(yy_state_1115)
+    T_LIDENT => Shift(yy_state_1118)
+    NT_type_ => Shift(yy_state_1124)
+    NT_non_empty_list_commas_trait_method_param_ => Shift(yy_state_1125)
+    NT_list_commas_trait_method_param_ => Shift(yy_state_1238)
+    T_RPAREN => Reduce(0, NT_list_commas_trait_method_param_, yy_action_272)
+    _ => Error
+  }
+}
+
+///|
+fn yy_state_1238(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_RPAREN => Shift(yy_state_1239)
+    _ => Error
+  }
+}
+
+///|
+fn yy_state_1239(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    NT_error_annotation => Shift(yy_state_50)
+    T_THIN_ARROW => Shift(yy_state_51)
+    T_NORAISE => Shift(yy_state_83)
+    T_RAISE => Shift(yy_state_84)
+    NT_func_return_type => Shift(yy_state_1240)
+    T_SEMI | T_RBRACE => Reduce(0, NT_func_return_type, yy_action_862)
+    _ => Error
+  }
+}
+
+///|
+fn yy_state_1240(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(7, NT_record_constr_decl, yy_action_211)
+}
+
+///|
+fn yy_state_1241(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_FN => Shift(yy_state_1242)
+    _ => Error
+  }
+}
+
+///|
+fn yy_state_1242(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    NT_type_parameters => Shift(yy_state_903)
+    NT_option_type_parameters_ => Shift(yy_state_943)
+    T_LBRACKET => Shift(yy_state_944)
+    NT_optional_type_parameters => Shift(yy_state_1243)
+    T_LIDENT => Reduce(0, NT_option_type_parameters_, yy_action_366)
+    _ => Error
+  }
+}
+
+///|
+fn yy_state_1243(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_LIDENT => Shift(yy_state_1244)
+    _ => Error
+  }
+}
+
+///|
+fn yy_state_1244(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_LPAREN => Shift(yy_state_1245)
+    _ => Error
+  }
+}
+
+///|
+fn yy_state_1245(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_ASYNC => Shift(yy_state_52)
+    T_UNDERSCORE => Shift(yy_state_57)
+    T_AMPER => Shift(yy_state_58)
+    T_PACKAGE_NAME => Shift(yy_state_60)
+    T_UIDENT => Shift(yy_state_67)
+    T_LPAREN => Shift(yy_state_71)
+    NT_simple_type => Shift(yy_state_100)
+    NT_trait_method_param => Shift(yy_state_1110)
+    NT_non_empty_list_commas_rev_trait_method_param_ => Shift(yy_state_1111)
+    T_POST_LABEL => Shift(yy_state_1115)
+    T_LIDENT => Shift(yy_state_1118)
+    NT_type_ => Shift(yy_state_1124)
+    NT_non_empty_list_commas_trait_method_param_ => Shift(yy_state_1125)
+    NT_list_commas_trait_method_param_ => Shift(yy_state_1246)
+    T_RPAREN => Reduce(0, NT_list_commas_trait_method_param_, yy_action_272)
+    _ => Error
+  }
+}
+
+///|
+fn yy_state_1246(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_RPAREN => Shift(yy_state_1247)
+    _ => Error
+  }
+}
+
+///|
+fn yy_state_1247(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    NT_error_annotation => Shift(yy_state_50)
+    T_THIN_ARROW => Shift(yy_state_51)
+    T_NORAISE => Shift(yy_state_83)
+    T_RAISE => Shift(yy_state_84)
+    NT_func_return_type => Shift(yy_state_1248)
+    T_SEMI | T_RBRACE => Reduce(0, NT_func_return_type, yy_action_862)
+    _ => Error
+  }
+}
+
+///|
+fn yy_state_1248(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(8, NT_record_constr_decl, yy_action_210)
+}
+
+///|
+fn yy_state_1249(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_MUTABLE => Shift(yy_state_921)
+    T_PUB => Shift(yy_state_1014)
+    T_PRIV => Shift(yy_state_1025)
+    NT_option_MUTABLE_ => Shift(yy_state_1030)
+    T_FN => Shift(yy_state_1250)
+    T_ASYNC => Shift(yy_state_1257)
+    T_LIDENT => Reduce(0, NT_option_MUTABLE_, yy_action_360)
+    _ => Error
+  }
+}
+
+///|
+fn yy_state_1250(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    NT_type_parameters => Shift(yy_state_903)
+    NT_option_type_parameters_ => Shift(yy_state_943)
+    T_LBRACKET => Shift(yy_state_944)
+    NT_optional_type_parameters => Shift(yy_state_1251)
+    T_LIDENT => Reduce(0, NT_option_type_parameters_, yy_action_366)
+    _ => Error
+  }
+}
+
+///|
+fn yy_state_1251(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_LIDENT => Shift(yy_state_1252)
+    _ => Error
+  }
+}
+
+///|
+fn yy_state_1252(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_LPAREN => Shift(yy_state_1253)
+    _ => Error
+  }
+}
+
+///|
+fn yy_state_1253(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_ASYNC => Shift(yy_state_52)
+    T_UNDERSCORE => Shift(yy_state_57)
+    T_AMPER => Shift(yy_state_58)
+    T_PACKAGE_NAME => Shift(yy_state_60)
+    T_UIDENT => Shift(yy_state_67)
+    T_LPAREN => Shift(yy_state_71)
+    NT_simple_type => Shift(yy_state_100)
+    NT_trait_method_param => Shift(yy_state_1110)
+    NT_non_empty_list_commas_rev_trait_method_param_ => Shift(yy_state_1111)
+    T_POST_LABEL => Shift(yy_state_1115)
+    T_LIDENT => Shift(yy_state_1118)
+    NT_type_ => Shift(yy_state_1124)
+    NT_non_empty_list_commas_trait_method_param_ => Shift(yy_state_1125)
+    NT_list_commas_trait_method_param_ => Shift(yy_state_1254)
+    T_RPAREN => Reduce(0, NT_list_commas_trait_method_param_, yy_action_272)
+    _ => Error
+  }
+}
+
+///|
+fn yy_state_1254(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_RPAREN => Shift(yy_state_1255)
+    _ => Error
+  }
+}
+
+///|
+fn yy_state_1255(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    NT_error_annotation => Shift(yy_state_50)
+    T_THIN_ARROW => Shift(yy_state_51)
+    T_NORAISE => Shift(yy_state_83)
+    T_RAISE => Shift(yy_state_84)
+    NT_func_return_type => Shift(yy_state_1256)
+    T_SEMI | T_RBRACE => Reduce(0, NT_func_return_type, yy_action_862)
+    _ => Error
+  }
+}
+
+///|
+fn yy_state_1256(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(8, NT_record_constr_decl, yy_action_209)
+}
+
+///|
+fn yy_state_1257(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_FN => Shift(yy_state_1258)
+    _ => Error
+  }
+}
+
+///|
+fn yy_state_1258(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    NT_type_parameters => Shift(yy_state_903)
+    NT_option_type_parameters_ => Shift(yy_state_943)
+    T_LBRACKET => Shift(yy_state_944)
+    NT_optional_type_parameters => Shift(yy_state_1259)
+    T_LIDENT => Reduce(0, NT_option_type_parameters_, yy_action_366)
+    _ => Error
+  }
+}
+
+///|
+fn yy_state_1259(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_LIDENT => Shift(yy_state_1260)
+    _ => Error
+  }
+}
+
+///|
+fn yy_state_1260(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_LPAREN => Shift(yy_state_1261)
+    _ => Error
+  }
+}
+
+///|
+fn yy_state_1261(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_ASYNC => Shift(yy_state_52)
+    T_UNDERSCORE => Shift(yy_state_57)
+    T_AMPER => Shift(yy_state_58)
+    T_PACKAGE_NAME => Shift(yy_state_60)
+    T_UIDENT => Shift(yy_state_67)
+    T_LPAREN => Shift(yy_state_71)
+    NT_simple_type => Shift(yy_state_100)
+    NT_trait_method_param => Shift(yy_state_1110)
+    NT_non_empty_list_commas_rev_trait_method_param_ => Shift(yy_state_1111)
+    T_POST_LABEL => Shift(yy_state_1115)
+    T_LIDENT => Shift(yy_state_1118)
+    NT_type_ => Shift(yy_state_1124)
+    NT_non_empty_list_commas_trait_method_param_ => Shift(yy_state_1125)
+    NT_list_commas_trait_method_param_ => Shift(yy_state_1262)
+    T_RPAREN => Reduce(0, NT_list_commas_trait_method_param_, yy_action_272)
+    _ => Error
+  }
+}
+
+///|
+fn yy_state_1262(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_RPAREN => Shift(yy_state_1263)
+    _ => Error
+  }
+}
+
+///|
+fn yy_state_1263(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    NT_error_annotation => Shift(yy_state_50)
+    T_THIN_ARROW => Shift(yy_state_51)
+    T_NORAISE => Shift(yy_state_83)
+    T_RAISE => Shift(yy_state_84)
+    NT_func_return_type => Shift(yy_state_1264)
+    T_SEMI | T_RBRACE => Reduce(0, NT_func_return_type, yy_action_862)
+    _ => Error
+  }
+}
+
+///|
+fn yy_state_1264(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(9, NT_record_constr_decl, yy_action_208)
+}
+
+///|
+fn yy_state_1265(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_SEMI => Shift(yy_state_230)
+    NT_option_SEMI_ => Shift(yy_state_1266)
+    T_RBRACE => Reduce(0, NT_option_SEMI_, yy_action_812)
+    _ => Error
+  }
+}
+
+///|
+fn yy_state_1266(_lookahead : YYSymbol) -> YYDecision {
+  ReduceNoLookahead(2, NT_record_decl_body, yy_action_207)
+}
+
+///|
+fn yy_state_1267(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_RBRACE => Shift(yy_state_1268)
+    _ => Error
+  }
+}
+
+///|
+fn yy_state_1268(_lookahead : YYSymbol) -> YYDecision {
+  match _lookahead {
+    T_DERIVE => Shift(yy_state_981)
+    NT_deriving_directive_list => Shift(yy_state_1269)
+    T_EOF | T_SEMI => Reduce(0, NT_deriving_directive_list, yy_action_325)
+    _ => Error
+  }
+}
+
+///|
+fn yy_state_1269(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(5, NT_structure_item, yy_action_206)
 }
 
 ///|
-fn yy_state_1222(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1270(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -46014,73 +47373,73 @@ fn yy_state_1222(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_type_ => Shift(yy_state_1223)
-    T_LBRACE => Shift(yy_state_1224)
-    NT_option_type__ => Shift(yy_state_1228)
+    NT_type_ => Shift(yy_state_1271)
+    T_LBRACE => Shift(yy_state_1272)
+    NT_option_type__ => Shift(yy_state_1276)
     T_EOF | T_DERIVE | T_SEMI => Reduce(0, NT_option_type__, yy_action_205)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1223(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1271(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(1, NT_option_type__, yy_action_204)
 }
 
 ///|
-fn yy_state_1224(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1272(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_ATTRIBUTE => Shift(yy_state_845)
-    NT_enum_constructor => Shift(yy_state_899)
-    NT_non_empty_list_attribute_ => Shift(yy_state_903)
-    T_UIDENT => Shift(yy_state_923)
-    NT_non_empty_list_semis_enum_constructor_ => Shift(yy_state_926)
-    NT_list_semis_enum_constructor_ => Shift(yy_state_1225)
-    T_RBRACE => Reduce(0, NT_list_semis_enum_constructor_, yy_action_354)
+    T_ATTRIBUTE => Shift(yy_state_853)
+    NT_enum_constructor => Shift(yy_state_907)
+    NT_non_empty_list_attribute_ => Shift(yy_state_911)
+    T_UIDENT => Shift(yy_state_931)
+    NT_non_empty_list_semis_enum_constructor_ => Shift(yy_state_934)
+    NT_list_semis_enum_constructor_ => Shift(yy_state_1273)
+    T_RBRACE => Reduce(0, NT_list_semis_enum_constructor_, yy_action_364)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1225(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1273(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RBRACE => Shift(yy_state_1226)
+    T_RBRACE => Shift(yy_state_1274)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1226(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1274(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_DERIVE => Shift(yy_state_973)
-    NT_deriving_directive_list => Shift(yy_state_1227)
-    T_EOF | T_SEMI => Reduce(0, NT_deriving_directive_list, yy_action_315)
+    T_DERIVE => Shift(yy_state_981)
+    NT_deriving_directive_list => Shift(yy_state_1275)
+    T_EOF | T_SEMI => Reduce(0, NT_deriving_directive_list, yy_action_325)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1227(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1275(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(5, NT_structure_item, yy_action_203)
 }
 
 ///|
-fn yy_state_1228(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1276(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_DERIVE => Shift(yy_state_973)
-    NT_deriving_directive_list => Shift(yy_state_1229)
-    T_EOF | T_SEMI => Reduce(0, NT_deriving_directive_list, yy_action_315)
+    T_DERIVE => Shift(yy_state_981)
+    NT_deriving_directive_list => Shift(yy_state_1277)
+    T_EOF | T_SEMI => Reduce(0, NT_deriving_directive_list, yy_action_325)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1229(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1277(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(3, NT_structure_item, yy_action_202)
 }
 
 ///|
-fn yy_state_1230(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1278(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -46089,17 +47448,17 @@ fn yy_state_1230(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    T_DERIVE => Shift(yy_state_973)
-    T_EQUAL => Shift(yy_state_1231)
-    NT_type_ => Shift(yy_state_1234)
-    NT_deriving_directive_list => Shift(yy_state_1236)
-    T_EOF | T_SEMI => Reduce(0, NT_deriving_directive_list, yy_action_315)
+    T_DERIVE => Shift(yy_state_981)
+    T_EQUAL => Shift(yy_state_1279)
+    NT_type_ => Shift(yy_state_1282)
+    NT_deriving_directive_list => Shift(yy_state_1284)
+    T_EOF | T_SEMI => Reduce(0, NT_deriving_directive_list, yy_action_325)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1231(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1279(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -46108,65 +47467,65 @@ fn yy_state_1231(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_type_ => Shift(yy_state_1232)
+    NT_type_ => Shift(yy_state_1280)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1232(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1280(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_DERIVE => Shift(yy_state_973)
-    NT_deriving_directive_list => Shift(yy_state_1233)
-    T_EOF | T_SEMI => Reduce(0, NT_deriving_directive_list, yy_action_315)
+    T_DERIVE => Shift(yy_state_981)
+    NT_deriving_directive_list => Shift(yy_state_1281)
+    T_EOF | T_SEMI => Reduce(0, NT_deriving_directive_list, yy_action_325)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1233(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1281(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(4, NT_structure_item, yy_action_201)
 }
 
 ///|
-fn yy_state_1234(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1282(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_DERIVE => Shift(yy_state_973)
-    NT_deriving_directive_list => Shift(yy_state_1235)
-    T_EOF | T_SEMI => Reduce(0, NT_deriving_directive_list, yy_action_315)
+    T_DERIVE => Shift(yy_state_981)
+    NT_deriving_directive_list => Shift(yy_state_1283)
+    T_EOF | T_SEMI => Reduce(0, NT_deriving_directive_list, yy_action_325)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1235(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1283(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(3, NT_structure_item, yy_action_200)
 }
 
 ///|
-fn yy_state_1236(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1284(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(2, NT_structure_item, yy_action_199)
 }
 
 ///|
-fn yy_state_1237(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1285(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1238)
+    T_UIDENT => Shift(yy_state_1286)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1238(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1286(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_1239)
+    T_COLON => Shift(yy_state_1287)
     T_EQUAL => Reduce(2, NT_val_header, yy_action_198)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1239(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1287(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -46175,35 +47534,35 @@ fn yy_state_1239(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_type_ => Shift(yy_state_1240)
+    NT_type_ => Shift(yy_state_1288)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1240(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1288(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(4, NT_val_header, yy_action_197)
 }
 
 ///|
-fn yy_state_1241(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1289(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LIDENT => Shift(yy_state_1242)
+    T_LIDENT => Shift(yy_state_1290)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1242(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1290(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_1243)
+    T_COLON => Shift(yy_state_1291)
     T_EQUAL => Reduce(2, NT_val_header, yy_action_196)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1243(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1291(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -46212,188 +47571,188 @@ fn yy_state_1243(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_type_ => Shift(yy_state_1244)
+    NT_type_ => Shift(yy_state_1292)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1244(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1292(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(4, NT_val_header, yy_action_195)
 }
 
 ///|
-fn yy_state_1245(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1293(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_TYPE => Shift(yy_state_1246)
-    T_STRING => Shift(yy_state_1250)
+    T_TYPE => Shift(yy_state_1294)
+    T_STRING => Shift(yy_state_1298)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1246(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1294(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1247)
+    T_UIDENT => Shift(yy_state_1295)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1247(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1295(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACKET => Shift(yy_state_849)
+    T_LBRACKET => Shift(yy_state_857)
     NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__ =>
-      Shift(yy_state_860)
-    NT_optional_type_parameters_no_constraints => Shift(yy_state_1248)
+      Shift(yy_state_868)
+    NT_optional_type_parameters_no_constraints => Shift(yy_state_1296)
     T_EOF | T_DERIVE | T_SEMI =>
       Reduce(
         0,
         NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__,
-        yy_action_384,
+        yy_action_394,
       )
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1248(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1296(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_DERIVE => Shift(yy_state_973)
-    NT_deriving_directive_list => Shift(yy_state_1249)
-    T_EOF | T_SEMI => Reduce(0, NT_deriving_directive_list, yy_action_315)
+    T_DERIVE => Shift(yy_state_981)
+    NT_deriving_directive_list => Shift(yy_state_1297)
+    T_EOF | T_SEMI => Reduce(0, NT_deriving_directive_list, yy_action_325)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1249(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1297(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(5, NT_structure_item, yy_action_194)
 }
 
 ///|
-fn yy_state_1250(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1298(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_FN => Shift(yy_state_1251)
+    T_FN => Shift(yy_state_1299)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1251(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1299(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_AMPER => Shift(yy_state_18)
     T_PACKAGE_NAME => Shift(yy_state_20)
     T_UIDENT => Shift(yy_state_23)
     NT_qual_ident_ty => Shift(yy_state_24)
-    NT_fun_binder => Shift(yy_state_1252)
-    T_LIDENT => Shift(yy_state_1257)
-    NT_type_name => Shift(yy_state_1258)
+    NT_fun_binder => Shift(yy_state_1300)
+    T_LIDENT => Shift(yy_state_1305)
+    NT_type_name => Shift(yy_state_1306)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1252(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1300(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_EXCLAMATION => Shift(yy_state_726)
-    NT_optional_bang => Shift(yy_state_1253)
+    T_EXCLAMATION => Shift(yy_state_734)
+    NT_optional_bang => Shift(yy_state_1301)
     T_RAISE | T_EQUAL | T_LPAREN | T_LBRACKET | T_THIN_ARROW | T_NORAISE =>
-      Reduce(0, NT_optional_bang, yy_action_851)
+      Reduce(0, NT_optional_bang, yy_action_863)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1253(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1301(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_type_parameters => Shift(yy_state_895)
-    NT_option_type_parameters_ => Shift(yy_state_935)
-    T_LBRACKET => Shift(yy_state_936)
-    NT_optional_type_parameters => Shift(yy_state_1254)
+    NT_type_parameters => Shift(yy_state_903)
+    NT_option_type_parameters_ => Shift(yy_state_943)
+    T_LBRACKET => Shift(yy_state_944)
+    NT_optional_type_parameters => Shift(yy_state_1302)
     T_RAISE | T_EQUAL | T_LPAREN | T_THIN_ARROW | T_NORAISE =>
-      Reduce(0, NT_option_type_parameters_, yy_action_356)
+      Reduce(0, NT_option_type_parameters_, yy_action_366)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1254(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1302(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LPAREN => Shift(yy_state_148)
-    NT_parameters => Shift(yy_state_1056)
-    NT_option_parameters_ => Shift(yy_state_1255)
+    NT_parameters => Shift(yy_state_1064)
+    NT_option_parameters_ => Shift(yy_state_1303)
     T_RAISE | T_EQUAL | T_THIN_ARROW | T_NORAISE =>
-      Reduce(0, NT_option_parameters_, yy_action_284)
+      Reduce(0, NT_option_parameters_, yy_action_294)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1255(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1303(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_error_annotation => Shift(yy_state_50)
     T_THIN_ARROW => Shift(yy_state_51)
     T_NORAISE => Shift(yy_state_83)
     T_RAISE => Shift(yy_state_84)
-    NT_func_return_type => Shift(yy_state_1256)
-    T_EQUAL => Reduce(0, NT_func_return_type, yy_action_850)
+    NT_func_return_type => Shift(yy_state_1304)
+    T_EQUAL => Reduce(0, NT_func_return_type, yy_action_862)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1256(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1304(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(8, NT_extern_fun_header, yy_action_193)
 }
 
 ///|
-fn yy_state_1257(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1305(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(1, NT_fun_binder, yy_action_192)
 }
 
 ///|
-fn yy_state_1258(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1306(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLONCOLON => Shift(yy_state_1259)
+    T_COLONCOLON => Shift(yy_state_1307)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1259(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1307(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LIDENT => Shift(yy_state_1260)
+    T_LIDENT => Shift(yy_state_1308)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1260(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1308(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(3, NT_fun_binder, yy_action_191)
 }
 
 ///|
-fn yy_state_1261(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1309(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_AMPER => Shift(yy_state_18)
     T_PACKAGE_NAME => Shift(yy_state_20)
     T_UIDENT => Shift(yy_state_23)
     NT_qual_ident_ty => Shift(yy_state_24)
-    T_LBRACKET => Shift(yy_state_936)
-    T_LIDENT => Shift(yy_state_1257)
-    NT_type_name => Shift(yy_state_1258)
-    NT_fun_binder => Shift(yy_state_1262)
-    NT_type_parameters => Shift(yy_state_1265)
+    T_LBRACKET => Shift(yy_state_944)
+    T_LIDENT => Shift(yy_state_1305)
+    NT_type_name => Shift(yy_state_1306)
+    NT_fun_binder => Shift(yy_state_1310)
+    NT_type_parameters => Shift(yy_state_1313)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1262(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1310(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_EXCLAMATION => Shift(yy_state_726)
-    NT_optional_bang => Shift(yy_state_1263)
+    T_EXCLAMATION => Shift(yy_state_734)
+    NT_optional_bang => Shift(yy_state_1311)
     T_EOF
     | T_RAISE
     | T_EQUAL
@@ -46402,18 +47761,18 @@ fn yy_state_1262(_lookahead : YYSymbol) -> YYDecision {
     | T_LBRACKET
     | T_LBRACE
     | T_THIN_ARROW
-    | T_NORAISE => Reduce(0, NT_optional_bang, yy_action_851)
+    | T_NORAISE => Reduce(0, NT_optional_bang, yy_action_863)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1263(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1311(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_type_parameters => Shift(yy_state_895)
-    NT_option_type_parameters_ => Shift(yy_state_935)
-    T_LBRACKET => Shift(yy_state_936)
-    NT_optional_type_parameters => Shift(yy_state_1264)
+    NT_type_parameters => Shift(yy_state_903)
+    NT_option_type_parameters_ => Shift(yy_state_943)
+    T_LBRACKET => Shift(yy_state_944)
+    NT_optional_type_parameters => Shift(yy_state_1312)
     T_EOF
     | T_RAISE
     | T_EQUAL
@@ -46421,35 +47780,35 @@ fn yy_state_1263(_lookahead : YYSymbol) -> YYDecision {
     | T_SEMI
     | T_LBRACE
     | T_THIN_ARROW
-    | T_NORAISE => Reduce(0, NT_option_type_parameters_, yy_action_356)
+    | T_NORAISE => Reduce(0, NT_option_type_parameters_, yy_action_366)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1264(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1312(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(4, NT_fun_header_generic, yy_action_190)
 }
 
 ///|
-fn yy_state_1265(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1313(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_AMPER => Shift(yy_state_18)
     T_PACKAGE_NAME => Shift(yy_state_20)
     T_UIDENT => Shift(yy_state_23)
     NT_qual_ident_ty => Shift(yy_state_24)
-    T_LIDENT => Shift(yy_state_1257)
-    NT_type_name => Shift(yy_state_1258)
-    NT_fun_binder => Shift(yy_state_1266)
+    T_LIDENT => Shift(yy_state_1305)
+    NT_type_name => Shift(yy_state_1306)
+    NT_fun_binder => Shift(yy_state_1314)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1266(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1314(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_EXCLAMATION => Shift(yy_state_726)
-    NT_optional_bang => Shift(yy_state_1267)
+    T_EXCLAMATION => Shift(yy_state_734)
+    NT_optional_bang => Shift(yy_state_1315)
     T_EOF
     | T_RAISE
     | T_EQUAL
@@ -46457,62 +47816,62 @@ fn yy_state_1266(_lookahead : YYSymbol) -> YYDecision {
     | T_SEMI
     | T_LBRACE
     | T_THIN_ARROW
-    | T_NORAISE => Reduce(0, NT_optional_bang, yy_action_851)
+    | T_NORAISE => Reduce(0, NT_optional_bang, yy_action_863)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1267(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1315(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(4, NT_fun_header_generic, yy_action_189)
 }
 
 ///|
-fn yy_state_1268(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1316(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_FN => Shift(yy_state_1261)
-    T_SUBERROR => Shift(yy_state_1269)
-    T_TYPE => Shift(yy_state_1271)
-    T_IMPL => Shift(yy_state_1274)
-    T_TRAIT => Shift(yy_state_1279)
-    T_CONST => Shift(yy_state_1285)
-    T_LET => Shift(yy_state_1289)
-    T_PUB => Shift(yy_state_1293)
-    T_PRIV => Shift(yy_state_1326)
-    NT_fun_header_generic => Shift(yy_state_1358)
-    T_ASYNC => Shift(yy_state_1361)
+    T_FN => Shift(yy_state_1309)
+    T_SUBERROR => Shift(yy_state_1317)
+    T_TYPE => Shift(yy_state_1319)
+    T_IMPL => Shift(yy_state_1322)
+    T_TRAIT => Shift(yy_state_1327)
+    T_CONST => Shift(yy_state_1333)
+    T_LET => Shift(yy_state_1337)
+    T_PUB => Shift(yy_state_1341)
+    T_PRIV => Shift(yy_state_1374)
+    NT_fun_header_generic => Shift(yy_state_1406)
+    T_ASYNC => Shift(yy_state_1409)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1269(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1317(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1270)
+    T_UIDENT => Shift(yy_state_1318)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1270(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1318(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(3, NT_suberror_header, yy_action_188)
 }
 
 ///|
-fn yy_state_1271(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1319(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1272)
+    T_UIDENT => Shift(yy_state_1320)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1272(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1320(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACKET => Shift(yy_state_849)
+    T_LBRACKET => Shift(yy_state_857)
     NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__ =>
-      Shift(yy_state_860)
-    NT_optional_type_parameters_no_constraints => Shift(yy_state_1273)
+      Shift(yy_state_868)
+    NT_optional_type_parameters_no_constraints => Shift(yy_state_1321)
     T_UIDENT
     | T_EOF
     | T_DERIVE
@@ -46526,52 +47885,52 @@ fn yy_state_1272(_lookahead : YYSymbol) -> YYDecision {
       Reduce(
         0,
         NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__,
-        yy_action_384,
+        yy_action_394,
       )
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1273(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1321(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(4, NT_type_header, yy_action_187)
 }
 
 ///|
-fn yy_state_1274(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1322(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_type_parameters => Shift(yy_state_895)
-    NT_option_type_parameters_ => Shift(yy_state_935)
-    T_LBRACKET => Shift(yy_state_936)
-    NT_optional_type_parameters => Shift(yy_state_1275)
+    NT_type_parameters => Shift(yy_state_903)
+    NT_option_type_parameters_ => Shift(yy_state_943)
+    T_LBRACKET => Shift(yy_state_944)
+    NT_optional_type_parameters => Shift(yy_state_1323)
     T_UIDENT | T_AMPER | T_PACKAGE_NAME =>
-      Reduce(0, NT_option_type_parameters_, yy_action_356)
+      Reduce(0, NT_option_type_parameters_, yy_action_366)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1275(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1323(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_AMPER => Shift(yy_state_18)
     T_PACKAGE_NAME => Shift(yy_state_20)
     T_UIDENT => Shift(yy_state_23)
     NT_qual_ident_ty => Shift(yy_state_24)
-    NT_type_name => Shift(yy_state_1276)
+    NT_type_name => Shift(yy_state_1324)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1276(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1324(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_FOR => Shift(yy_state_1277)
+    T_FOR => Shift(yy_state_1325)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1277(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1325(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -46580,95 +47939,95 @@ fn yy_state_1277(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_type_ => Shift(yy_state_1278)
+    NT_type_ => Shift(yy_state_1326)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1278(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1326(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(6, NT_structure_item, yy_action_186)
 }
 
 ///|
-fn yy_state_1279(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1327(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1280)
+    T_UIDENT => Shift(yy_state_1328)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1280(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1328(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_1089)
+    T_COLON => Shift(yy_state_1097)
     NT_option_preceded_COLON_separated_nonempty_list_PLUS_tvar_constraint___ =>
-      Shift(yy_state_1281)
+      Shift(yy_state_1329)
     T_LBRACE =>
       Reduce(
         0,
         NT_option_preceded_COLON_separated_nonempty_list_PLUS_tvar_constraint___,
-        yy_action_268,
+        yy_action_278,
       )
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1281(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1329(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACE => Shift(yy_state_1282)
+    T_LBRACE => Shift(yy_state_1330)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1282(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1330(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_ATTRIBUTE => Shift(yy_state_845)
-    NT_trait_method_decl => Shift(yy_state_1093)
-    NT_non_empty_list_attribute_ => Shift(yy_state_1097)
-    T_LIDENT => Shift(yy_state_1134)
-    T_ASYNC => Shift(yy_state_1142)
-    NT_non_empty_list_semis_trait_method_decl_ => Shift(yy_state_1151)
-    NT_list_semis_trait_method_decl_ => Shift(yy_state_1283)
-    T_RBRACE => Reduce(0, NT_list_semis_trait_method_decl_, yy_action_265)
+    T_ATTRIBUTE => Shift(yy_state_853)
+    NT_trait_method_decl => Shift(yy_state_1101)
+    NT_non_empty_list_attribute_ => Shift(yy_state_1105)
+    T_LIDENT => Shift(yy_state_1142)
+    T_ASYNC => Shift(yy_state_1150)
+    NT_non_empty_list_semis_trait_method_decl_ => Shift(yy_state_1159)
+    NT_list_semis_trait_method_decl_ => Shift(yy_state_1331)
+    T_RBRACE => Reduce(0, NT_list_semis_trait_method_decl_, yy_action_275)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1283(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1331(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RBRACE => Shift(yy_state_1284)
+    T_RBRACE => Shift(yy_state_1332)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1284(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1332(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(7, NT_structure_item, yy_action_185)
 }
 
 ///|
-fn yy_state_1285(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1333(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1286)
+    T_UIDENT => Shift(yy_state_1334)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1286(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1334(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_1287)
+    T_COLON => Shift(yy_state_1335)
     T_EQUAL => Reduce(3, NT_val_header, yy_action_184)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1287(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1335(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -46677,35 +48036,35 @@ fn yy_state_1287(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_type_ => Shift(yy_state_1288)
+    NT_type_ => Shift(yy_state_1336)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1288(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1336(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(5, NT_val_header, yy_action_183)
 }
 
 ///|
-fn yy_state_1289(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1337(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LIDENT => Shift(yy_state_1290)
+    T_LIDENT => Shift(yy_state_1338)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1290(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1338(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_1291)
+    T_COLON => Shift(yy_state_1339)
     T_EQUAL => Reduce(3, NT_val_header, yy_action_182)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1291(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1339(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -46714,71 +48073,71 @@ fn yy_state_1291(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_type_ => Shift(yy_state_1292)
+    NT_type_ => Shift(yy_state_1340)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1292(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1340(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(5, NT_val_header, yy_action_181)
 }
 
 ///|
-fn yy_state_1293(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1341(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LPAREN => Shift(yy_state_1012)
-    NT_pub_attr => Shift(yy_state_1294)
+    T_LPAREN => Shift(yy_state_1020)
+    NT_pub_attr => Shift(yy_state_1342)
     T_TRAIT | T_IMPL | T_ASYNC | T_FN | T_LET | T_CONST | T_TYPE | T_SUBERROR =>
-      Reduce(0, NT_pub_attr, yy_action_300)
+      Reduce(0, NT_pub_attr, yy_action_310)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1294(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1342(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_FN => Shift(yy_state_1261)
-    T_SUBERROR => Shift(yy_state_1295)
-    T_TYPE => Shift(yy_state_1297)
-    T_IMPL => Shift(yy_state_1300)
-    T_TRAIT => Shift(yy_state_1305)
-    T_CONST => Shift(yy_state_1311)
-    T_LET => Shift(yy_state_1315)
-    NT_fun_header_generic => Shift(yy_state_1319)
-    T_ASYNC => Shift(yy_state_1322)
+    T_FN => Shift(yy_state_1309)
+    T_SUBERROR => Shift(yy_state_1343)
+    T_TYPE => Shift(yy_state_1345)
+    T_IMPL => Shift(yy_state_1348)
+    T_TRAIT => Shift(yy_state_1353)
+    T_CONST => Shift(yy_state_1359)
+    T_LET => Shift(yy_state_1363)
+    NT_fun_header_generic => Shift(yy_state_1367)
+    T_ASYNC => Shift(yy_state_1370)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1295(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1343(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1296)
+    T_UIDENT => Shift(yy_state_1344)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1296(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1344(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(5, NT_suberror_header, yy_action_180)
 }
 
 ///|
-fn yy_state_1297(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1345(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1298)
+    T_UIDENT => Shift(yy_state_1346)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1298(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1346(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACKET => Shift(yy_state_849)
+    T_LBRACKET => Shift(yy_state_857)
     NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__ =>
-      Shift(yy_state_860)
-    NT_optional_type_parameters_no_constraints => Shift(yy_state_1299)
+      Shift(yy_state_868)
+    NT_optional_type_parameters_no_constraints => Shift(yy_state_1347)
     T_UIDENT
     | T_EOF
     | T_DERIVE
@@ -46792,52 +48151,52 @@ fn yy_state_1298(_lookahead : YYSymbol) -> YYDecision {
       Reduce(
         0,
         NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__,
-        yy_action_384,
+        yy_action_394,
       )
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1299(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1347(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(6, NT_type_header, yy_action_179)
 }
 
 ///|
-fn yy_state_1300(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1348(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_type_parameters => Shift(yy_state_895)
-    NT_option_type_parameters_ => Shift(yy_state_935)
-    T_LBRACKET => Shift(yy_state_936)
-    NT_optional_type_parameters => Shift(yy_state_1301)
+    NT_type_parameters => Shift(yy_state_903)
+    NT_option_type_parameters_ => Shift(yy_state_943)
+    T_LBRACKET => Shift(yy_state_944)
+    NT_optional_type_parameters => Shift(yy_state_1349)
     T_UIDENT | T_AMPER | T_PACKAGE_NAME =>
-      Reduce(0, NT_option_type_parameters_, yy_action_356)
+      Reduce(0, NT_option_type_parameters_, yy_action_366)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1301(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1349(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_AMPER => Shift(yy_state_18)
     T_PACKAGE_NAME => Shift(yy_state_20)
     T_UIDENT => Shift(yy_state_23)
     NT_qual_ident_ty => Shift(yy_state_24)
-    NT_type_name => Shift(yy_state_1302)
+    NT_type_name => Shift(yy_state_1350)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1302(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1350(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_FOR => Shift(yy_state_1303)
+    T_FOR => Shift(yy_state_1351)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1303(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1351(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -46846,95 +48205,95 @@ fn yy_state_1303(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_type_ => Shift(yy_state_1304)
+    NT_type_ => Shift(yy_state_1352)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1304(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1352(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(8, NT_structure_item, yy_action_178)
 }
 
 ///|
-fn yy_state_1305(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1353(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1306)
+    T_UIDENT => Shift(yy_state_1354)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1306(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1354(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_1089)
+    T_COLON => Shift(yy_state_1097)
     NT_option_preceded_COLON_separated_nonempty_list_PLUS_tvar_constraint___ =>
-      Shift(yy_state_1307)
+      Shift(yy_state_1355)
     T_LBRACE =>
       Reduce(
         0,
         NT_option_preceded_COLON_separated_nonempty_list_PLUS_tvar_constraint___,
-        yy_action_268,
+        yy_action_278,
       )
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1307(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1355(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACE => Shift(yy_state_1308)
+    T_LBRACE => Shift(yy_state_1356)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1308(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1356(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_ATTRIBUTE => Shift(yy_state_845)
-    NT_trait_method_decl => Shift(yy_state_1093)
-    NT_non_empty_list_attribute_ => Shift(yy_state_1097)
-    T_LIDENT => Shift(yy_state_1134)
-    T_ASYNC => Shift(yy_state_1142)
-    NT_non_empty_list_semis_trait_method_decl_ => Shift(yy_state_1151)
-    NT_list_semis_trait_method_decl_ => Shift(yy_state_1309)
-    T_RBRACE => Reduce(0, NT_list_semis_trait_method_decl_, yy_action_265)
+    T_ATTRIBUTE => Shift(yy_state_853)
+    NT_trait_method_decl => Shift(yy_state_1101)
+    NT_non_empty_list_attribute_ => Shift(yy_state_1105)
+    T_LIDENT => Shift(yy_state_1142)
+    T_ASYNC => Shift(yy_state_1150)
+    NT_non_empty_list_semis_trait_method_decl_ => Shift(yy_state_1159)
+    NT_list_semis_trait_method_decl_ => Shift(yy_state_1357)
+    T_RBRACE => Reduce(0, NT_list_semis_trait_method_decl_, yy_action_275)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1309(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1357(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RBRACE => Shift(yy_state_1310)
+    T_RBRACE => Shift(yy_state_1358)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1310(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1358(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(9, NT_structure_item, yy_action_177)
 }
 
 ///|
-fn yy_state_1311(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1359(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1312)
+    T_UIDENT => Shift(yy_state_1360)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1312(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1360(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_1313)
+    T_COLON => Shift(yy_state_1361)
     T_EQUAL => Reduce(5, NT_val_header, yy_action_176)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1313(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1361(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -46943,35 +48302,35 @@ fn yy_state_1313(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_type_ => Shift(yy_state_1314)
+    NT_type_ => Shift(yy_state_1362)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1314(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1362(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(7, NT_val_header, yy_action_175)
 }
 
 ///|
-fn yy_state_1315(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1363(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LIDENT => Shift(yy_state_1316)
+    T_LIDENT => Shift(yy_state_1364)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1316(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1364(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_1317)
+    T_COLON => Shift(yy_state_1365)
     T_EQUAL => Reduce(5, NT_val_header, yy_action_174)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1317(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1365(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -46980,129 +48339,129 @@ fn yy_state_1317(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_type_ => Shift(yy_state_1318)
+    NT_type_ => Shift(yy_state_1366)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1318(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1366(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(7, NT_val_header, yy_action_173)
 }
 
 ///|
-fn yy_state_1319(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1367(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LPAREN => Shift(yy_state_148)
-    NT_parameters => Shift(yy_state_1056)
-    NT_option_parameters_ => Shift(yy_state_1320)
+    NT_parameters => Shift(yy_state_1064)
+    NT_option_parameters_ => Shift(yy_state_1368)
     T_EOF | T_RAISE | T_SEMI | T_THIN_ARROW | T_NORAISE =>
-      Reduce(0, NT_option_parameters_, yy_action_284)
+      Reduce(0, NT_option_parameters_, yy_action_294)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1320(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1368(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_error_annotation => Shift(yy_state_50)
     T_THIN_ARROW => Shift(yy_state_51)
     T_NORAISE => Shift(yy_state_83)
     T_RAISE => Shift(yy_state_84)
-    NT_func_return_type => Shift(yy_state_1321)
-    T_EOF | T_SEMI => Reduce(0, NT_func_return_type, yy_action_850)
+    NT_func_return_type => Shift(yy_state_1369)
+    T_EOF | T_SEMI => Reduce(0, NT_func_return_type, yy_action_862)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1321(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1369(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(6, NT_declare_fun_header, yy_action_172)
 }
 
 ///|
-fn yy_state_1322(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1370(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_FN => Shift(yy_state_1261)
-    NT_fun_header_generic => Shift(yy_state_1323)
+    T_FN => Shift(yy_state_1309)
+    NT_fun_header_generic => Shift(yy_state_1371)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1323(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1371(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LPAREN => Shift(yy_state_148)
-    NT_parameters => Shift(yy_state_1056)
-    NT_option_parameters_ => Shift(yy_state_1324)
+    NT_parameters => Shift(yy_state_1064)
+    NT_option_parameters_ => Shift(yy_state_1372)
     T_EOF | T_RAISE | T_SEMI | T_THIN_ARROW | T_NORAISE =>
-      Reduce(0, NT_option_parameters_, yy_action_284)
+      Reduce(0, NT_option_parameters_, yy_action_294)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1324(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1372(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_error_annotation => Shift(yy_state_50)
     T_THIN_ARROW => Shift(yy_state_51)
     T_NORAISE => Shift(yy_state_83)
     T_RAISE => Shift(yy_state_84)
-    NT_func_return_type => Shift(yy_state_1325)
-    T_EOF | T_SEMI => Reduce(0, NT_func_return_type, yy_action_850)
+    NT_func_return_type => Shift(yy_state_1373)
+    T_EOF | T_SEMI => Reduce(0, NT_func_return_type, yy_action_862)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1325(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1373(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(7, NT_declare_fun_header, yy_action_171)
 }
 
 ///|
-fn yy_state_1326(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1374(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_FN => Shift(yy_state_1261)
-    T_SUBERROR => Shift(yy_state_1327)
-    T_TYPE => Shift(yy_state_1329)
-    T_IMPL => Shift(yy_state_1332)
-    T_TRAIT => Shift(yy_state_1337)
-    T_CONST => Shift(yy_state_1343)
-    T_LET => Shift(yy_state_1347)
-    NT_fun_header_generic => Shift(yy_state_1351)
-    T_ASYNC => Shift(yy_state_1354)
+    T_FN => Shift(yy_state_1309)
+    T_SUBERROR => Shift(yy_state_1375)
+    T_TYPE => Shift(yy_state_1377)
+    T_IMPL => Shift(yy_state_1380)
+    T_TRAIT => Shift(yy_state_1385)
+    T_CONST => Shift(yy_state_1391)
+    T_LET => Shift(yy_state_1395)
+    NT_fun_header_generic => Shift(yy_state_1399)
+    T_ASYNC => Shift(yy_state_1402)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1327(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1375(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1328)
+    T_UIDENT => Shift(yy_state_1376)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1328(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1376(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(4, NT_suberror_header, yy_action_170)
 }
 
 ///|
-fn yy_state_1329(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1377(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1330)
+    T_UIDENT => Shift(yy_state_1378)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1330(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1378(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACKET => Shift(yy_state_849)
+    T_LBRACKET => Shift(yy_state_857)
     NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__ =>
-      Shift(yy_state_860)
-    NT_optional_type_parameters_no_constraints => Shift(yy_state_1331)
+      Shift(yy_state_868)
+    NT_optional_type_parameters_no_constraints => Shift(yy_state_1379)
     T_UIDENT
     | T_EOF
     | T_DERIVE
@@ -47116,52 +48475,52 @@ fn yy_state_1330(_lookahead : YYSymbol) -> YYDecision {
       Reduce(
         0,
         NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__,
-        yy_action_384,
+        yy_action_394,
       )
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1331(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1379(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(5, NT_type_header, yy_action_169)
 }
 
 ///|
-fn yy_state_1332(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1380(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_type_parameters => Shift(yy_state_895)
-    NT_option_type_parameters_ => Shift(yy_state_935)
-    T_LBRACKET => Shift(yy_state_936)
-    NT_optional_type_parameters => Shift(yy_state_1333)
+    NT_type_parameters => Shift(yy_state_903)
+    NT_option_type_parameters_ => Shift(yy_state_943)
+    T_LBRACKET => Shift(yy_state_944)
+    NT_optional_type_parameters => Shift(yy_state_1381)
     T_UIDENT | T_AMPER | T_PACKAGE_NAME =>
-      Reduce(0, NT_option_type_parameters_, yy_action_356)
+      Reduce(0, NT_option_type_parameters_, yy_action_366)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1333(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1381(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_AMPER => Shift(yy_state_18)
     T_PACKAGE_NAME => Shift(yy_state_20)
     T_UIDENT => Shift(yy_state_23)
     NT_qual_ident_ty => Shift(yy_state_24)
-    NT_type_name => Shift(yy_state_1334)
+    NT_type_name => Shift(yy_state_1382)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1334(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1382(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_FOR => Shift(yy_state_1335)
+    T_FOR => Shift(yy_state_1383)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1335(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1383(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -47170,95 +48529,95 @@ fn yy_state_1335(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_type_ => Shift(yy_state_1336)
+    NT_type_ => Shift(yy_state_1384)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1336(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1384(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(7, NT_structure_item, yy_action_168)
 }
 
 ///|
-fn yy_state_1337(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1385(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1338)
+    T_UIDENT => Shift(yy_state_1386)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1338(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1386(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_1089)
+    T_COLON => Shift(yy_state_1097)
     NT_option_preceded_COLON_separated_nonempty_list_PLUS_tvar_constraint___ =>
-      Shift(yy_state_1339)
+      Shift(yy_state_1387)
     T_LBRACE =>
       Reduce(
         0,
         NT_option_preceded_COLON_separated_nonempty_list_PLUS_tvar_constraint___,
-        yy_action_268,
+        yy_action_278,
       )
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1339(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1387(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACE => Shift(yy_state_1340)
+    T_LBRACE => Shift(yy_state_1388)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1340(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1388(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_ATTRIBUTE => Shift(yy_state_845)
-    NT_trait_method_decl => Shift(yy_state_1093)
-    NT_non_empty_list_attribute_ => Shift(yy_state_1097)
-    T_LIDENT => Shift(yy_state_1134)
-    T_ASYNC => Shift(yy_state_1142)
-    NT_non_empty_list_semis_trait_method_decl_ => Shift(yy_state_1151)
-    NT_list_semis_trait_method_decl_ => Shift(yy_state_1341)
-    T_RBRACE => Reduce(0, NT_list_semis_trait_method_decl_, yy_action_265)
+    T_ATTRIBUTE => Shift(yy_state_853)
+    NT_trait_method_decl => Shift(yy_state_1101)
+    NT_non_empty_list_attribute_ => Shift(yy_state_1105)
+    T_LIDENT => Shift(yy_state_1142)
+    T_ASYNC => Shift(yy_state_1150)
+    NT_non_empty_list_semis_trait_method_decl_ => Shift(yy_state_1159)
+    NT_list_semis_trait_method_decl_ => Shift(yy_state_1389)
+    T_RBRACE => Reduce(0, NT_list_semis_trait_method_decl_, yy_action_275)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1341(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1389(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RBRACE => Shift(yy_state_1342)
+    T_RBRACE => Shift(yy_state_1390)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1342(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1390(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(8, NT_structure_item, yy_action_167)
 }
 
 ///|
-fn yy_state_1343(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1391(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1344)
+    T_UIDENT => Shift(yy_state_1392)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1344(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1392(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_1345)
+    T_COLON => Shift(yy_state_1393)
     T_EQUAL => Reduce(4, NT_val_header, yy_action_166)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1345(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1393(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -47267,35 +48626,35 @@ fn yy_state_1345(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_type_ => Shift(yy_state_1346)
+    NT_type_ => Shift(yy_state_1394)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1346(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1394(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(6, NT_val_header, yy_action_165)
 }
 
 ///|
-fn yy_state_1347(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1395(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LIDENT => Shift(yy_state_1348)
+    T_LIDENT => Shift(yy_state_1396)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1348(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1396(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_1349)
+    T_COLON => Shift(yy_state_1397)
     T_EQUAL => Reduce(4, NT_val_header, yy_action_164)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1349(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1397(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -47304,270 +48663,270 @@ fn yy_state_1349(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_type_ => Shift(yy_state_1350)
+    NT_type_ => Shift(yy_state_1398)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1350(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1398(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(6, NT_val_header, yy_action_163)
 }
 
 ///|
-fn yy_state_1351(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1399(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LPAREN => Shift(yy_state_148)
-    NT_parameters => Shift(yy_state_1056)
-    NT_option_parameters_ => Shift(yy_state_1352)
+    NT_parameters => Shift(yy_state_1064)
+    NT_option_parameters_ => Shift(yy_state_1400)
     T_EOF | T_RAISE | T_SEMI | T_THIN_ARROW | T_NORAISE =>
-      Reduce(0, NT_option_parameters_, yy_action_284)
+      Reduce(0, NT_option_parameters_, yy_action_294)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1352(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1400(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_error_annotation => Shift(yy_state_50)
     T_THIN_ARROW => Shift(yy_state_51)
     T_NORAISE => Shift(yy_state_83)
     T_RAISE => Shift(yy_state_84)
-    NT_func_return_type => Shift(yy_state_1353)
-    T_EOF | T_SEMI => Reduce(0, NT_func_return_type, yy_action_850)
+    NT_func_return_type => Shift(yy_state_1401)
+    T_EOF | T_SEMI => Reduce(0, NT_func_return_type, yy_action_862)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1353(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1401(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(5, NT_declare_fun_header, yy_action_162)
 }
 
 ///|
-fn yy_state_1354(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1402(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_FN => Shift(yy_state_1261)
-    NT_fun_header_generic => Shift(yy_state_1355)
+    T_FN => Shift(yy_state_1309)
+    NT_fun_header_generic => Shift(yy_state_1403)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1355(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1403(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LPAREN => Shift(yy_state_148)
-    NT_parameters => Shift(yy_state_1056)
-    NT_option_parameters_ => Shift(yy_state_1356)
+    NT_parameters => Shift(yy_state_1064)
+    NT_option_parameters_ => Shift(yy_state_1404)
     T_EOF | T_RAISE | T_SEMI | T_THIN_ARROW | T_NORAISE =>
-      Reduce(0, NT_option_parameters_, yy_action_284)
+      Reduce(0, NT_option_parameters_, yy_action_294)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1356(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1404(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_error_annotation => Shift(yy_state_50)
     T_THIN_ARROW => Shift(yy_state_51)
     T_NORAISE => Shift(yy_state_83)
     T_RAISE => Shift(yy_state_84)
-    NT_func_return_type => Shift(yy_state_1357)
-    T_EOF | T_SEMI => Reduce(0, NT_func_return_type, yy_action_850)
+    NT_func_return_type => Shift(yy_state_1405)
+    T_EOF | T_SEMI => Reduce(0, NT_func_return_type, yy_action_862)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1357(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1405(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(6, NT_declare_fun_header, yy_action_161)
 }
 
 ///|
-fn yy_state_1358(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1406(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LPAREN => Shift(yy_state_148)
-    NT_parameters => Shift(yy_state_1056)
-    NT_option_parameters_ => Shift(yy_state_1359)
+    NT_parameters => Shift(yy_state_1064)
+    NT_option_parameters_ => Shift(yy_state_1407)
     T_EOF | T_RAISE | T_SEMI | T_THIN_ARROW | T_NORAISE =>
-      Reduce(0, NT_option_parameters_, yy_action_284)
+      Reduce(0, NT_option_parameters_, yy_action_294)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1359(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1407(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_error_annotation => Shift(yy_state_50)
     T_THIN_ARROW => Shift(yy_state_51)
     T_NORAISE => Shift(yy_state_83)
     T_RAISE => Shift(yy_state_84)
-    NT_func_return_type => Shift(yy_state_1360)
-    T_EOF | T_SEMI => Reduce(0, NT_func_return_type, yy_action_850)
+    NT_func_return_type => Shift(yy_state_1408)
+    T_EOF | T_SEMI => Reduce(0, NT_func_return_type, yy_action_862)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1360(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1408(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(4, NT_declare_fun_header, yy_action_160)
 }
 
 ///|
-fn yy_state_1361(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1409(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_FN => Shift(yy_state_1261)
-    NT_fun_header_generic => Shift(yy_state_1362)
+    T_FN => Shift(yy_state_1309)
+    NT_fun_header_generic => Shift(yy_state_1410)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1362(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1410(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LPAREN => Shift(yy_state_148)
-    NT_parameters => Shift(yy_state_1056)
-    NT_option_parameters_ => Shift(yy_state_1363)
+    NT_parameters => Shift(yy_state_1064)
+    NT_option_parameters_ => Shift(yy_state_1411)
     T_EOF | T_RAISE | T_SEMI | T_THIN_ARROW | T_NORAISE =>
-      Reduce(0, NT_option_parameters_, yy_action_284)
+      Reduce(0, NT_option_parameters_, yy_action_294)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1363(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1411(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_error_annotation => Shift(yy_state_50)
     T_THIN_ARROW => Shift(yy_state_51)
     T_NORAISE => Shift(yy_state_83)
     T_RAISE => Shift(yy_state_84)
-    NT_func_return_type => Shift(yy_state_1364)
-    T_EOF | T_SEMI => Reduce(0, NT_func_return_type, yy_action_850)
+    NT_func_return_type => Shift(yy_state_1412)
+    T_EOF | T_SEMI => Reduce(0, NT_func_return_type, yy_action_862)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1364(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1412(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(5, NT_declare_fun_header, yy_action_159)
 }
 
 ///|
-fn yy_state_1365(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1413(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_FN => Shift(yy_state_1261)
-    T_ENUM => Shift(yy_state_1366)
-    T_STRUCT => Shift(yy_state_1369)
-    T_SUBERROR => Shift(yy_state_1372)
-    T_TYPE => Shift(yy_state_1374)
-    T_USING => Shift(yy_state_1377)
-    T_ENUMVIEW => Shift(yy_state_1382)
-    T_IMPL => Shift(yy_state_1394)
-    T_TEST => Shift(yy_state_1411)
-    T_TRAITALIAS => Shift(yy_state_1415)
-    T_TYPEALIAS => Shift(yy_state_1417)
-    T_TRAIT => Shift(yy_state_1423)
-    T_FNALIAS => Shift(yy_state_1429)
-    T_CONST => Shift(yy_state_1431)
-    T_LET => Shift(yy_state_1435)
-    T_EXTERN => Shift(yy_state_1439)
-    T_DECLARE => Shift(yy_state_1451)
-    T_PUB => Shift(yy_state_1548)
-    T_PRIV => Shift(yy_state_1638)
-    NT_fun_header_generic => Shift(yy_state_1727)
-    T_ASYNC => Shift(yy_state_1730)
+    T_FN => Shift(yy_state_1309)
+    T_ENUM => Shift(yy_state_1414)
+    T_STRUCT => Shift(yy_state_1417)
+    T_SUBERROR => Shift(yy_state_1420)
+    T_TYPE => Shift(yy_state_1422)
+    T_USING => Shift(yy_state_1425)
+    T_ENUMVIEW => Shift(yy_state_1430)
+    T_IMPL => Shift(yy_state_1442)
+    T_TEST => Shift(yy_state_1459)
+    T_TRAITALIAS => Shift(yy_state_1463)
+    T_TYPEALIAS => Shift(yy_state_1465)
+    T_TRAIT => Shift(yy_state_1471)
+    T_FNALIAS => Shift(yy_state_1477)
+    T_CONST => Shift(yy_state_1479)
+    T_LET => Shift(yy_state_1483)
+    T_EXTERN => Shift(yy_state_1487)
+    T_DECLARE => Shift(yy_state_1499)
+    T_PUB => Shift(yy_state_1596)
+    T_PRIV => Shift(yy_state_1686)
+    NT_fun_header_generic => Shift(yy_state_1775)
+    T_ASYNC => Shift(yy_state_1778)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1366(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1414(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1367)
+    T_UIDENT => Shift(yy_state_1415)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1367(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1415(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACKET => Shift(yy_state_849)
+    T_LBRACKET => Shift(yy_state_857)
     NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__ =>
-      Shift(yy_state_860)
-    NT_optional_type_parameters_no_constraints => Shift(yy_state_1368)
+      Shift(yy_state_868)
+    NT_optional_type_parameters_no_constraints => Shift(yy_state_1416)
     T_LBRACE =>
       Reduce(
         0,
         NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__,
-        yy_action_384,
+        yy_action_394,
       )
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1368(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1416(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(4, NT_enum_header, yy_action_158)
 }
 
 ///|
-fn yy_state_1369(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1417(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1370)
+    T_UIDENT => Shift(yy_state_1418)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1370(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1418(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACKET => Shift(yy_state_849)
+    T_LBRACKET => Shift(yy_state_857)
     NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__ =>
-      Shift(yy_state_860)
-    NT_optional_type_parameters_no_constraints => Shift(yy_state_1371)
+      Shift(yy_state_868)
+    NT_optional_type_parameters_no_constraints => Shift(yy_state_1419)
     T_LPAREN | T_LBRACE =>
       Reduce(
         0,
         NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__,
-        yy_action_384,
+        yy_action_394,
       )
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1371(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1419(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(4, NT_struct_header, yy_action_157)
 }
 
 ///|
-fn yy_state_1372(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1420(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1373)
+    T_UIDENT => Shift(yy_state_1421)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1373(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1421(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(3, NT_suberror_header, yy_action_156)
 }
 
 ///|
-fn yy_state_1374(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1422(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1375)
+    T_UIDENT => Shift(yy_state_1423)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1375(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1423(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACKET => Shift(yy_state_849)
+    T_LBRACKET => Shift(yy_state_857)
     NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__ =>
-      Shift(yy_state_860)
-    NT_optional_type_parameters_no_constraints => Shift(yy_state_1376)
+      Shift(yy_state_868)
+    NT_optional_type_parameters_no_constraints => Shift(yy_state_1424)
     T_UIDENT
     | T_EOF
     | T_DERIVE
@@ -47581,122 +48940,122 @@ fn yy_state_1375(_lookahead : YYSymbol) -> YYDecision {
       Reduce(
         0,
         NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__,
-        yy_action_384,
+        yy_action_394,
       )
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1376(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1424(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(4, NT_type_header, yy_action_155)
 }
 
 ///|
-fn yy_state_1377(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1425(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_PACKAGE_NAME => Shift(yy_state_1378)
+    T_PACKAGE_NAME => Shift(yy_state_1426)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1378(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1426(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACE => Shift(yy_state_1379)
+    T_LBRACE => Shift(yy_state_1427)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1379(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1427(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_using_binder => Shift(yy_state_872)
-    NT_non_empty_list_commas_rev_using_binder_ => Shift(yy_state_873)
-    T_TRAIT => Shift(yy_state_877)
-    T_TYPE => Shift(yy_state_881)
-    T_UIDENT => Shift(yy_state_885)
-    T_LIDENT => Shift(yy_state_888)
-    NT_non_empty_list_commas_using_binder_ => Shift(yy_state_891)
-    NT_list_commas_using_binder_ => Shift(yy_state_1380)
-    T_RBRACE => Reduce(0, NT_list_commas_using_binder_, yy_action_370)
+    NT_using_binder => Shift(yy_state_880)
+    NT_non_empty_list_commas_rev_using_binder_ => Shift(yy_state_881)
+    T_TRAIT => Shift(yy_state_885)
+    T_TYPE => Shift(yy_state_889)
+    T_UIDENT => Shift(yy_state_893)
+    T_LIDENT => Shift(yy_state_896)
+    NT_non_empty_list_commas_using_binder_ => Shift(yy_state_899)
+    NT_list_commas_using_binder_ => Shift(yy_state_1428)
+    T_RBRACE => Reduce(0, NT_list_commas_using_binder_, yy_action_380)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1380(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1428(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RBRACE => Shift(yy_state_1381)
+    T_RBRACE => Shift(yy_state_1429)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1381(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1429(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(6, NT_structure_item, yy_action_154)
 }
 
 ///|
-fn yy_state_1382(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1430(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_type_parameters => Shift(yy_state_895)
-    NT_option_type_parameters_ => Shift(yy_state_935)
-    T_LBRACKET => Shift(yy_state_936)
-    NT_optional_type_parameters => Shift(yy_state_1383)
-    T_UIDENT => Reduce(0, NT_option_type_parameters_, yy_action_356)
+    NT_type_parameters => Shift(yy_state_903)
+    NT_option_type_parameters_ => Shift(yy_state_943)
+    T_LBRACKET => Shift(yy_state_944)
+    NT_optional_type_parameters => Shift(yy_state_1431)
+    T_UIDENT => Reduce(0, NT_option_type_parameters_, yy_action_366)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1383(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1431(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1384)
+    T_UIDENT => Shift(yy_state_1432)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1384(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1432(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACE => Shift(yy_state_1385)
+    T_LBRACE => Shift(yy_state_1433)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1385(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1433(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_ATTRIBUTE => Shift(yy_state_845)
-    NT_enum_constructor => Shift(yy_state_899)
-    NT_non_empty_list_attribute_ => Shift(yy_state_903)
-    T_UIDENT => Shift(yy_state_923)
-    NT_non_empty_list_semis_enum_constructor_ => Shift(yy_state_926)
-    NT_list_semis_enum_constructor_ => Shift(yy_state_1386)
-    T_RBRACE => Reduce(0, NT_list_semis_enum_constructor_, yy_action_354)
+    T_ATTRIBUTE => Shift(yy_state_853)
+    NT_enum_constructor => Shift(yy_state_907)
+    NT_non_empty_list_attribute_ => Shift(yy_state_911)
+    T_UIDENT => Shift(yy_state_931)
+    NT_non_empty_list_semis_enum_constructor_ => Shift(yy_state_934)
+    NT_list_semis_enum_constructor_ => Shift(yy_state_1434)
+    T_RBRACE => Reduce(0, NT_list_semis_enum_constructor_, yy_action_364)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1386(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1434(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RBRACE => Shift(yy_state_1387)
+    T_RBRACE => Shift(yy_state_1435)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1387(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1435(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_FOR => Shift(yy_state_1388)
+    T_FOR => Shift(yy_state_1436)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1388(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1436(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -47705,142 +49064,142 @@ fn yy_state_1388(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_type_ => Shift(yy_state_1389)
+    NT_type_ => Shift(yy_state_1437)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1389(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1437(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_WITH => Shift(yy_state_1390)
+    T_WITH => Shift(yy_state_1438)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1390(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1438(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LIDENT => Shift(yy_state_1391)
+    T_LIDENT => Shift(yy_state_1439)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1391(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1439(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LPAREN => Shift(yy_state_148)
-    NT_parameters => Shift(yy_state_1392)
+    NT_parameters => Shift(yy_state_1440)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1392(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1440(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LBRACE => Shift(yy_state_124)
-    NT_block_expr => Shift(yy_state_1393)
+    NT_block_expr => Shift(yy_state_1441)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1393(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1441(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(13, NT_structure_item, yy_action_153)
 }
 
 ///|
-fn yy_state_1394(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1442(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_type_parameters => Shift(yy_state_895)
-    NT_option_type_parameters_ => Shift(yy_state_935)
-    T_LBRACKET => Shift(yy_state_936)
-    NT_optional_type_parameters => Shift(yy_state_1395)
+    NT_type_parameters => Shift(yy_state_903)
+    NT_option_type_parameters_ => Shift(yy_state_943)
+    T_LBRACKET => Shift(yy_state_944)
+    NT_optional_type_parameters => Shift(yy_state_1443)
     T_UIDENT | T_AMPER | T_PACKAGE_NAME =>
-      Reduce(0, NT_option_type_parameters_, yy_action_356)
+      Reduce(0, NT_option_type_parameters_, yy_action_366)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1395(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1443(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_AMPER => Shift(yy_state_18)
     T_PACKAGE_NAME => Shift(yy_state_20)
     T_UIDENT => Shift(yy_state_23)
     NT_qual_ident_ty => Shift(yy_state_24)
-    NT_type_name => Shift(yy_state_1396)
+    NT_type_name => Shift(yy_state_1444)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1396(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1444(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_WITH => Shift(yy_state_1397)
-    T_FOR => Shift(yy_state_1403)
+    T_WITH => Shift(yy_state_1445)
+    T_FOR => Shift(yy_state_1451)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1397(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1445(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LIDENT => Shift(yy_state_1398)
+    T_LIDENT => Shift(yy_state_1446)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1398(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1446(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_EXCLAMATION => Shift(yy_state_726)
-    NT_optional_bang => Shift(yy_state_1399)
-    T_LPAREN => Reduce(0, NT_optional_bang, yy_action_851)
+    T_EXCLAMATION => Shift(yy_state_734)
+    NT_optional_bang => Shift(yy_state_1447)
+    T_LPAREN => Reduce(0, NT_optional_bang, yy_action_863)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1399(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1447(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LPAREN => Shift(yy_state_148)
-    NT_parameters => Shift(yy_state_1400)
+    NT_parameters => Shift(yy_state_1448)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1400(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1448(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_error_annotation => Shift(yy_state_50)
     T_THIN_ARROW => Shift(yy_state_51)
     T_NORAISE => Shift(yy_state_83)
     T_RAISE => Shift(yy_state_84)
-    NT_func_return_type => Shift(yy_state_1401)
-    T_EQUAL | T_LBRACE => Reduce(0, NT_func_return_type, yy_action_850)
+    NT_func_return_type => Shift(yy_state_1449)
+    T_EQUAL | T_LBRACE => Reduce(0, NT_func_return_type, yy_action_862)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1401(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1449(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_EQUAL => Shift(yy_state_960)
-    NT_block_expr_with_local_types => Shift(yy_state_962)
-    T_LBRACE => Shift(yy_state_963)
-    NT_impl_body => Shift(yy_state_1402)
+    T_EQUAL => Shift(yy_state_968)
+    NT_block_expr_with_local_types => Shift(yy_state_970)
+    T_LBRACE => Shift(yy_state_971)
+    NT_impl_body => Shift(yy_state_1450)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1402(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1450(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(10, NT_structure_item, yy_action_152)
 }
 
 ///|
-fn yy_state_1403(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1451(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -47849,287 +49208,287 @@ fn yy_state_1403(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_type_ => Shift(yy_state_1404)
+    NT_type_ => Shift(yy_state_1452)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1404(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1452(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_WITH => Shift(yy_state_1405)
+    T_WITH => Shift(yy_state_1453)
     T_EOF | T_SEMI => Reduce(6, NT_structure_item, yy_action_151)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1405(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1453(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LIDENT => Shift(yy_state_1406)
+    T_LIDENT => Shift(yy_state_1454)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1406(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1454(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_EXCLAMATION => Shift(yy_state_726)
-    NT_optional_bang => Shift(yy_state_1407)
-    T_LPAREN => Reduce(0, NT_optional_bang, yy_action_851)
+    T_EXCLAMATION => Shift(yy_state_734)
+    NT_optional_bang => Shift(yy_state_1455)
+    T_LPAREN => Reduce(0, NT_optional_bang, yy_action_863)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1407(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1455(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LPAREN => Shift(yy_state_148)
-    NT_parameters => Shift(yy_state_1408)
+    NT_parameters => Shift(yy_state_1456)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1408(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1456(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_error_annotation => Shift(yy_state_50)
     T_THIN_ARROW => Shift(yy_state_51)
     T_NORAISE => Shift(yy_state_83)
     T_RAISE => Shift(yy_state_84)
-    NT_func_return_type => Shift(yy_state_1409)
-    T_EQUAL | T_LBRACE => Reduce(0, NT_func_return_type, yy_action_850)
+    NT_func_return_type => Shift(yy_state_1457)
+    T_EQUAL | T_LBRACE => Reduce(0, NT_func_return_type, yy_action_862)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1409(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1457(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_EQUAL => Shift(yy_state_960)
-    NT_block_expr_with_local_types => Shift(yy_state_962)
-    T_LBRACE => Shift(yy_state_963)
-    NT_impl_body => Shift(yy_state_1410)
+    T_EQUAL => Shift(yy_state_968)
+    NT_block_expr_with_local_types => Shift(yy_state_970)
+    T_LBRACE => Shift(yy_state_971)
+    NT_impl_body => Shift(yy_state_1458)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1410(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1458(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(12, NT_structure_item, yy_action_150)
 }
 
 ///|
-fn yy_state_1411(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1459(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_STRING => Shift(yy_state_1054)
-    NT_option_loced_string_ => Shift(yy_state_1412)
-    T_LPAREN | T_LBRACE => Reduce(0, NT_option_loced_string_, yy_action_287)
+    T_STRING => Shift(yy_state_1062)
+    NT_option_loced_string_ => Shift(yy_state_1460)
+    T_LPAREN | T_LBRACE => Reduce(0, NT_option_loced_string_, yy_action_297)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1412(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1460(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LPAREN => Shift(yy_state_148)
-    NT_parameters => Shift(yy_state_1056)
-    NT_option_parameters_ => Shift(yy_state_1413)
-    T_LBRACE => Reduce(0, NT_option_parameters_, yy_action_284)
+    NT_parameters => Shift(yy_state_1064)
+    NT_option_parameters_ => Shift(yy_state_1461)
+    T_LBRACE => Reduce(0, NT_option_parameters_, yy_action_294)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1413(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1461(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACE => Shift(yy_state_963)
-    NT_block_expr_with_local_types => Shift(yy_state_1414)
+    T_LBRACE => Shift(yy_state_971)
+    NT_block_expr_with_local_types => Shift(yy_state_1462)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1414(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1462(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(5, NT_structure_item, yy_action_149)
 }
 
 ///|
-fn yy_state_1415(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1463(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1060)
-    NT_batch_type_alias_target_UIDENT_ => Shift(yy_state_1063)
-    T_PACKAGE_NAME => Shift(yy_state_1064)
-    NT_batch_type_alias_targets => Shift(yy_state_1416)
+    T_UIDENT => Shift(yy_state_1068)
+    NT_batch_type_alias_target_UIDENT_ => Shift(yy_state_1071)
+    T_PACKAGE_NAME => Shift(yy_state_1072)
+    NT_batch_type_alias_targets => Shift(yy_state_1464)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1416(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1464(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(3, NT_structure_item, yy_action_148)
 }
 
 ///|
-fn yy_state_1417(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1465(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
     T_AMPER => Shift(yy_state_58)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_batch_type_alias_target_UIDENT_ => Shift(yy_state_1063)
-    T_UIDENT => Shift(yy_state_1079)
-    T_PACKAGE_NAME => Shift(yy_state_1080)
-    NT_type_ => Shift(yy_state_1418)
-    NT_batch_type_alias_targets => Shift(yy_state_1422)
+    NT_batch_type_alias_target_UIDENT_ => Shift(yy_state_1071)
+    T_UIDENT => Shift(yy_state_1087)
+    T_PACKAGE_NAME => Shift(yy_state_1088)
+    NT_type_ => Shift(yy_state_1466)
+    NT_batch_type_alias_targets => Shift(yy_state_1470)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1418(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1466(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_AS => Shift(yy_state_1419)
+    T_AS => Shift(yy_state_1467)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1419(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1467(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1420)
+    T_UIDENT => Shift(yy_state_1468)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1420(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1468(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACKET => Shift(yy_state_849)
+    T_LBRACKET => Shift(yy_state_857)
     NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__ =>
-      Shift(yy_state_860)
-    NT_optional_type_parameters_no_constraints => Shift(yy_state_1421)
+      Shift(yy_state_868)
+    NT_optional_type_parameters_no_constraints => Shift(yy_state_1469)
     T_EOF | T_SEMI =>
       Reduce(
         0,
         NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__,
-        yy_action_384,
+        yy_action_394,
       )
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1421(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1469(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(6, NT_structure_item, yy_action_147)
 }
 
 ///|
-fn yy_state_1422(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1470(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(3, NT_structure_item, yy_action_146)
 }
 
 ///|
-fn yy_state_1423(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1471(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1424)
+    T_UIDENT => Shift(yy_state_1472)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1424(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1472(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_1089)
+    T_COLON => Shift(yy_state_1097)
     NT_option_preceded_COLON_separated_nonempty_list_PLUS_tvar_constraint___ =>
-      Shift(yy_state_1425)
+      Shift(yy_state_1473)
     T_LBRACE =>
       Reduce(
         0,
         NT_option_preceded_COLON_separated_nonempty_list_PLUS_tvar_constraint___,
-        yy_action_268,
+        yy_action_278,
       )
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1425(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1473(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACE => Shift(yy_state_1426)
+    T_LBRACE => Shift(yy_state_1474)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1426(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1474(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_ATTRIBUTE => Shift(yy_state_845)
-    NT_trait_method_decl => Shift(yy_state_1093)
-    NT_non_empty_list_attribute_ => Shift(yy_state_1097)
-    T_LIDENT => Shift(yy_state_1134)
-    T_ASYNC => Shift(yy_state_1142)
-    NT_non_empty_list_semis_trait_method_decl_ => Shift(yy_state_1151)
-    NT_list_semis_trait_method_decl_ => Shift(yy_state_1427)
-    T_RBRACE => Reduce(0, NT_list_semis_trait_method_decl_, yy_action_265)
+    T_ATTRIBUTE => Shift(yy_state_853)
+    NT_trait_method_decl => Shift(yy_state_1101)
+    NT_non_empty_list_attribute_ => Shift(yy_state_1105)
+    T_LIDENT => Shift(yy_state_1142)
+    T_ASYNC => Shift(yy_state_1150)
+    NT_non_empty_list_semis_trait_method_decl_ => Shift(yy_state_1159)
+    NT_list_semis_trait_method_decl_ => Shift(yy_state_1475)
+    T_RBRACE => Reduce(0, NT_list_semis_trait_method_decl_, yy_action_275)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1427(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1475(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RBRACE => Shift(yy_state_1428)
+    T_RBRACE => Shift(yy_state_1476)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1428(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1476(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(7, NT_structure_item, yy_action_145)
 }
 
 ///|
-fn yy_state_1429(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1477(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1155)
-    T_LIDENT => Shift(yy_state_1157)
-    NT_option_func_alias_type_name_LIDENT_UIDENT__ => Shift(yy_state_1162)
-    T_PACKAGE_NAME => Shift(yy_state_1172)
-    NT_func_alias_type_name_LIDENT_UIDENT_ => Shift(yy_state_1187)
-    NT_func_alias_target_LIDENT_ => Shift(yy_state_1189)
-    NT_func_alias_targets => Shift(yy_state_1430)
+    T_UIDENT => Shift(yy_state_1163)
+    T_LIDENT => Shift(yy_state_1165)
+    NT_option_func_alias_type_name_LIDENT_UIDENT__ => Shift(yy_state_1170)
+    T_PACKAGE_NAME => Shift(yy_state_1180)
+    NT_func_alias_type_name_LIDENT_UIDENT_ => Shift(yy_state_1195)
+    NT_func_alias_target_LIDENT_ => Shift(yy_state_1197)
+    NT_func_alias_targets => Shift(yy_state_1478)
     T_LPAREN =>
-      Reduce(0, NT_option_func_alias_type_name_LIDENT_UIDENT__, yy_action_243)
+      Reduce(0, NT_option_func_alias_type_name_LIDENT_UIDENT__, yy_action_253)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1430(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1478(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(3, NT_structure_item, yy_action_144)
 }
 
 ///|
-fn yy_state_1431(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1479(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1432)
+    T_UIDENT => Shift(yy_state_1480)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1432(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1480(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_1433)
+    T_COLON => Shift(yy_state_1481)
     T_EQUAL => Reduce(3, NT_val_header, yy_action_143)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1433(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1481(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -48138,35 +49497,35 @@ fn yy_state_1433(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_type_ => Shift(yy_state_1434)
+    NT_type_ => Shift(yy_state_1482)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1434(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1482(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(5, NT_val_header, yy_action_142)
 }
 
 ///|
-fn yy_state_1435(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1483(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LIDENT => Shift(yy_state_1436)
+    T_LIDENT => Shift(yy_state_1484)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1436(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1484(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_1437)
+    T_COLON => Shift(yy_state_1485)
     T_EQUAL => Reduce(3, NT_val_header, yy_action_141)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1437(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1485(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -48175,187 +49534,187 @@ fn yy_state_1437(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_type_ => Shift(yy_state_1438)
+    NT_type_ => Shift(yy_state_1486)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1438(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1486(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(5, NT_val_header, yy_action_140)
 }
 
 ///|
-fn yy_state_1439(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1487(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_TYPE => Shift(yy_state_1440)
-    T_STRING => Shift(yy_state_1444)
+    T_TYPE => Shift(yy_state_1488)
+    T_STRING => Shift(yy_state_1492)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1440(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1488(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1441)
+    T_UIDENT => Shift(yy_state_1489)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1441(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1489(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACKET => Shift(yy_state_849)
+    T_LBRACKET => Shift(yy_state_857)
     NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__ =>
-      Shift(yy_state_860)
-    NT_optional_type_parameters_no_constraints => Shift(yy_state_1442)
+      Shift(yy_state_868)
+    NT_optional_type_parameters_no_constraints => Shift(yy_state_1490)
     T_EOF | T_DERIVE | T_SEMI =>
       Reduce(
         0,
         NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__,
-        yy_action_384,
+        yy_action_394,
       )
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1442(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1490(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_DERIVE => Shift(yy_state_973)
-    NT_deriving_directive_list => Shift(yy_state_1443)
-    T_EOF | T_SEMI => Reduce(0, NT_deriving_directive_list, yy_action_315)
+    T_DERIVE => Shift(yy_state_981)
+    NT_deriving_directive_list => Shift(yy_state_1491)
+    T_EOF | T_SEMI => Reduce(0, NT_deriving_directive_list, yy_action_325)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1443(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1491(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(6, NT_structure_item, yy_action_139)
 }
 
 ///|
-fn yy_state_1444(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1492(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_FN => Shift(yy_state_1445)
+    T_FN => Shift(yy_state_1493)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1445(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1493(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_AMPER => Shift(yy_state_18)
     T_PACKAGE_NAME => Shift(yy_state_20)
     T_UIDENT => Shift(yy_state_23)
     NT_qual_ident_ty => Shift(yy_state_24)
-    T_LIDENT => Shift(yy_state_1257)
-    NT_type_name => Shift(yy_state_1258)
-    NT_fun_binder => Shift(yy_state_1446)
+    T_LIDENT => Shift(yy_state_1305)
+    NT_type_name => Shift(yy_state_1306)
+    NT_fun_binder => Shift(yy_state_1494)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1446(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1494(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_EXCLAMATION => Shift(yy_state_726)
-    NT_optional_bang => Shift(yy_state_1447)
+    T_EXCLAMATION => Shift(yy_state_734)
+    NT_optional_bang => Shift(yy_state_1495)
     T_RAISE | T_EQUAL | T_LPAREN | T_LBRACKET | T_THIN_ARROW | T_NORAISE =>
-      Reduce(0, NT_optional_bang, yy_action_851)
+      Reduce(0, NT_optional_bang, yy_action_863)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1447(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1495(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_type_parameters => Shift(yy_state_895)
-    NT_option_type_parameters_ => Shift(yy_state_935)
-    T_LBRACKET => Shift(yy_state_936)
-    NT_optional_type_parameters => Shift(yy_state_1448)
+    NT_type_parameters => Shift(yy_state_903)
+    NT_option_type_parameters_ => Shift(yy_state_943)
+    T_LBRACKET => Shift(yy_state_944)
+    NT_optional_type_parameters => Shift(yy_state_1496)
     T_RAISE | T_EQUAL | T_LPAREN | T_THIN_ARROW | T_NORAISE =>
-      Reduce(0, NT_option_type_parameters_, yy_action_356)
+      Reduce(0, NT_option_type_parameters_, yy_action_366)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1448(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1496(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LPAREN => Shift(yy_state_148)
-    NT_parameters => Shift(yy_state_1056)
-    NT_option_parameters_ => Shift(yy_state_1449)
+    NT_parameters => Shift(yy_state_1064)
+    NT_option_parameters_ => Shift(yy_state_1497)
     T_RAISE | T_EQUAL | T_THIN_ARROW | T_NORAISE =>
-      Reduce(0, NT_option_parameters_, yy_action_284)
+      Reduce(0, NT_option_parameters_, yy_action_294)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1449(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1497(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_error_annotation => Shift(yy_state_50)
     T_THIN_ARROW => Shift(yy_state_51)
     T_NORAISE => Shift(yy_state_83)
     T_RAISE => Shift(yy_state_84)
-    NT_func_return_type => Shift(yy_state_1450)
-    T_EQUAL => Reduce(0, NT_func_return_type, yy_action_850)
+    NT_func_return_type => Shift(yy_state_1498)
+    T_EQUAL => Reduce(0, NT_func_return_type, yy_action_862)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1450(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1498(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(9, NT_extern_fun_header, yy_action_138)
 }
 
 ///|
-fn yy_state_1451(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1499(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_FN => Shift(yy_state_1261)
-    T_SUBERROR => Shift(yy_state_1452)
-    T_TYPE => Shift(yy_state_1454)
-    T_IMPL => Shift(yy_state_1457)
-    T_TRAIT => Shift(yy_state_1462)
-    T_CONST => Shift(yy_state_1468)
-    T_LET => Shift(yy_state_1472)
-    T_PUB => Shift(yy_state_1476)
-    T_PRIV => Shift(yy_state_1509)
-    NT_fun_header_generic => Shift(yy_state_1541)
-    T_ASYNC => Shift(yy_state_1544)
+    T_FN => Shift(yy_state_1309)
+    T_SUBERROR => Shift(yy_state_1500)
+    T_TYPE => Shift(yy_state_1502)
+    T_IMPL => Shift(yy_state_1505)
+    T_TRAIT => Shift(yy_state_1510)
+    T_CONST => Shift(yy_state_1516)
+    T_LET => Shift(yy_state_1520)
+    T_PUB => Shift(yy_state_1524)
+    T_PRIV => Shift(yy_state_1557)
+    NT_fun_header_generic => Shift(yy_state_1589)
+    T_ASYNC => Shift(yy_state_1592)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1452(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1500(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1453)
+    T_UIDENT => Shift(yy_state_1501)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1453(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1501(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(4, NT_suberror_header, yy_action_137)
 }
 
 ///|
-fn yy_state_1454(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1502(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1455)
+    T_UIDENT => Shift(yy_state_1503)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1455(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1503(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACKET => Shift(yy_state_849)
+    T_LBRACKET => Shift(yy_state_857)
     NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__ =>
-      Shift(yy_state_860)
-    NT_optional_type_parameters_no_constraints => Shift(yy_state_1456)
+      Shift(yy_state_868)
+    NT_optional_type_parameters_no_constraints => Shift(yy_state_1504)
     T_UIDENT
     | T_EOF
     | T_DERIVE
@@ -48369,52 +49728,52 @@ fn yy_state_1455(_lookahead : YYSymbol) -> YYDecision {
       Reduce(
         0,
         NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__,
-        yy_action_384,
+        yy_action_394,
       )
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1456(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1504(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(5, NT_type_header, yy_action_136)
 }
 
 ///|
-fn yy_state_1457(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1505(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_type_parameters => Shift(yy_state_895)
-    NT_option_type_parameters_ => Shift(yy_state_935)
-    T_LBRACKET => Shift(yy_state_936)
-    NT_optional_type_parameters => Shift(yy_state_1458)
+    NT_type_parameters => Shift(yy_state_903)
+    NT_option_type_parameters_ => Shift(yy_state_943)
+    T_LBRACKET => Shift(yy_state_944)
+    NT_optional_type_parameters => Shift(yy_state_1506)
     T_UIDENT | T_AMPER | T_PACKAGE_NAME =>
-      Reduce(0, NT_option_type_parameters_, yy_action_356)
+      Reduce(0, NT_option_type_parameters_, yy_action_366)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1458(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1506(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_AMPER => Shift(yy_state_18)
     T_PACKAGE_NAME => Shift(yy_state_20)
     T_UIDENT => Shift(yy_state_23)
     NT_qual_ident_ty => Shift(yy_state_24)
-    NT_type_name => Shift(yy_state_1459)
+    NT_type_name => Shift(yy_state_1507)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1459(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1507(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_FOR => Shift(yy_state_1460)
+    T_FOR => Shift(yy_state_1508)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1460(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1508(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -48423,95 +49782,95 @@ fn yy_state_1460(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_type_ => Shift(yy_state_1461)
+    NT_type_ => Shift(yy_state_1509)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1461(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1509(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(7, NT_structure_item, yy_action_135)
 }
 
 ///|
-fn yy_state_1462(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1510(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1463)
+    T_UIDENT => Shift(yy_state_1511)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1463(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1511(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_1089)
+    T_COLON => Shift(yy_state_1097)
     NT_option_preceded_COLON_separated_nonempty_list_PLUS_tvar_constraint___ =>
-      Shift(yy_state_1464)
+      Shift(yy_state_1512)
     T_LBRACE =>
       Reduce(
         0,
         NT_option_preceded_COLON_separated_nonempty_list_PLUS_tvar_constraint___,
-        yy_action_268,
+        yy_action_278,
       )
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1464(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1512(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACE => Shift(yy_state_1465)
+    T_LBRACE => Shift(yy_state_1513)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1465(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1513(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_ATTRIBUTE => Shift(yy_state_845)
-    NT_trait_method_decl => Shift(yy_state_1093)
-    NT_non_empty_list_attribute_ => Shift(yy_state_1097)
-    T_LIDENT => Shift(yy_state_1134)
-    T_ASYNC => Shift(yy_state_1142)
-    NT_non_empty_list_semis_trait_method_decl_ => Shift(yy_state_1151)
-    NT_list_semis_trait_method_decl_ => Shift(yy_state_1466)
-    T_RBRACE => Reduce(0, NT_list_semis_trait_method_decl_, yy_action_265)
+    T_ATTRIBUTE => Shift(yy_state_853)
+    NT_trait_method_decl => Shift(yy_state_1101)
+    NT_non_empty_list_attribute_ => Shift(yy_state_1105)
+    T_LIDENT => Shift(yy_state_1142)
+    T_ASYNC => Shift(yy_state_1150)
+    NT_non_empty_list_semis_trait_method_decl_ => Shift(yy_state_1159)
+    NT_list_semis_trait_method_decl_ => Shift(yy_state_1514)
+    T_RBRACE => Reduce(0, NT_list_semis_trait_method_decl_, yy_action_275)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1466(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1514(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RBRACE => Shift(yy_state_1467)
+    T_RBRACE => Shift(yy_state_1515)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1467(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1515(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(8, NT_structure_item, yy_action_134)
 }
 
 ///|
-fn yy_state_1468(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1516(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1469)
+    T_UIDENT => Shift(yy_state_1517)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1469(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1517(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_1470)
+    T_COLON => Shift(yy_state_1518)
     T_EQUAL => Reduce(4, NT_val_header, yy_action_133)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1470(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1518(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -48520,35 +49879,35 @@ fn yy_state_1470(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_type_ => Shift(yy_state_1471)
+    NT_type_ => Shift(yy_state_1519)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1471(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1519(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(6, NT_val_header, yy_action_132)
 }
 
 ///|
-fn yy_state_1472(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1520(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LIDENT => Shift(yy_state_1473)
+    T_LIDENT => Shift(yy_state_1521)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1473(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1521(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_1474)
+    T_COLON => Shift(yy_state_1522)
     T_EQUAL => Reduce(4, NT_val_header, yy_action_131)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1474(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1522(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -48557,71 +49916,71 @@ fn yy_state_1474(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_type_ => Shift(yy_state_1475)
+    NT_type_ => Shift(yy_state_1523)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1475(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1523(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(6, NT_val_header, yy_action_130)
 }
 
 ///|
-fn yy_state_1476(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1524(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LPAREN => Shift(yy_state_1012)
-    NT_pub_attr => Shift(yy_state_1477)
+    T_LPAREN => Shift(yy_state_1020)
+    NT_pub_attr => Shift(yy_state_1525)
     T_TRAIT | T_IMPL | T_ASYNC | T_FN | T_LET | T_CONST | T_TYPE | T_SUBERROR =>
-      Reduce(0, NT_pub_attr, yy_action_300)
+      Reduce(0, NT_pub_attr, yy_action_310)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1477(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1525(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_FN => Shift(yy_state_1261)
-    T_SUBERROR => Shift(yy_state_1478)
-    T_TYPE => Shift(yy_state_1480)
-    T_IMPL => Shift(yy_state_1483)
-    T_TRAIT => Shift(yy_state_1488)
-    T_CONST => Shift(yy_state_1494)
-    T_LET => Shift(yy_state_1498)
-    NT_fun_header_generic => Shift(yy_state_1502)
-    T_ASYNC => Shift(yy_state_1505)
+    T_FN => Shift(yy_state_1309)
+    T_SUBERROR => Shift(yy_state_1526)
+    T_TYPE => Shift(yy_state_1528)
+    T_IMPL => Shift(yy_state_1531)
+    T_TRAIT => Shift(yy_state_1536)
+    T_CONST => Shift(yy_state_1542)
+    T_LET => Shift(yy_state_1546)
+    NT_fun_header_generic => Shift(yy_state_1550)
+    T_ASYNC => Shift(yy_state_1553)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1478(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1526(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1479)
+    T_UIDENT => Shift(yy_state_1527)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1479(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1527(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(6, NT_suberror_header, yy_action_129)
 }
 
 ///|
-fn yy_state_1480(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1528(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1481)
+    T_UIDENT => Shift(yy_state_1529)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1481(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1529(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACKET => Shift(yy_state_849)
+    T_LBRACKET => Shift(yy_state_857)
     NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__ =>
-      Shift(yy_state_860)
-    NT_optional_type_parameters_no_constraints => Shift(yy_state_1482)
+      Shift(yy_state_868)
+    NT_optional_type_parameters_no_constraints => Shift(yy_state_1530)
     T_UIDENT
     | T_EOF
     | T_DERIVE
@@ -48635,52 +49994,52 @@ fn yy_state_1481(_lookahead : YYSymbol) -> YYDecision {
       Reduce(
         0,
         NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__,
-        yy_action_384,
+        yy_action_394,
       )
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1482(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1530(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(7, NT_type_header, yy_action_128)
 }
 
 ///|
-fn yy_state_1483(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1531(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_type_parameters => Shift(yy_state_895)
-    NT_option_type_parameters_ => Shift(yy_state_935)
-    T_LBRACKET => Shift(yy_state_936)
-    NT_optional_type_parameters => Shift(yy_state_1484)
+    NT_type_parameters => Shift(yy_state_903)
+    NT_option_type_parameters_ => Shift(yy_state_943)
+    T_LBRACKET => Shift(yy_state_944)
+    NT_optional_type_parameters => Shift(yy_state_1532)
     T_UIDENT | T_AMPER | T_PACKAGE_NAME =>
-      Reduce(0, NT_option_type_parameters_, yy_action_356)
+      Reduce(0, NT_option_type_parameters_, yy_action_366)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1484(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1532(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_AMPER => Shift(yy_state_18)
     T_PACKAGE_NAME => Shift(yy_state_20)
     T_UIDENT => Shift(yy_state_23)
     NT_qual_ident_ty => Shift(yy_state_24)
-    NT_type_name => Shift(yy_state_1485)
+    NT_type_name => Shift(yy_state_1533)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1485(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1533(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_FOR => Shift(yy_state_1486)
+    T_FOR => Shift(yy_state_1534)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1486(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1534(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -48689,95 +50048,95 @@ fn yy_state_1486(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_type_ => Shift(yy_state_1487)
+    NT_type_ => Shift(yy_state_1535)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1487(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1535(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(9, NT_structure_item, yy_action_127)
 }
 
 ///|
-fn yy_state_1488(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1536(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1489)
+    T_UIDENT => Shift(yy_state_1537)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1489(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1537(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_1089)
+    T_COLON => Shift(yy_state_1097)
     NT_option_preceded_COLON_separated_nonempty_list_PLUS_tvar_constraint___ =>
-      Shift(yy_state_1490)
+      Shift(yy_state_1538)
     T_LBRACE =>
       Reduce(
         0,
         NT_option_preceded_COLON_separated_nonempty_list_PLUS_tvar_constraint___,
-        yy_action_268,
+        yy_action_278,
       )
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1490(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1538(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACE => Shift(yy_state_1491)
+    T_LBRACE => Shift(yy_state_1539)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1491(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1539(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_ATTRIBUTE => Shift(yy_state_845)
-    NT_trait_method_decl => Shift(yy_state_1093)
-    NT_non_empty_list_attribute_ => Shift(yy_state_1097)
-    T_LIDENT => Shift(yy_state_1134)
-    T_ASYNC => Shift(yy_state_1142)
-    NT_non_empty_list_semis_trait_method_decl_ => Shift(yy_state_1151)
-    NT_list_semis_trait_method_decl_ => Shift(yy_state_1492)
-    T_RBRACE => Reduce(0, NT_list_semis_trait_method_decl_, yy_action_265)
+    T_ATTRIBUTE => Shift(yy_state_853)
+    NT_trait_method_decl => Shift(yy_state_1101)
+    NT_non_empty_list_attribute_ => Shift(yy_state_1105)
+    T_LIDENT => Shift(yy_state_1142)
+    T_ASYNC => Shift(yy_state_1150)
+    NT_non_empty_list_semis_trait_method_decl_ => Shift(yy_state_1159)
+    NT_list_semis_trait_method_decl_ => Shift(yy_state_1540)
+    T_RBRACE => Reduce(0, NT_list_semis_trait_method_decl_, yy_action_275)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1492(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1540(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RBRACE => Shift(yy_state_1493)
+    T_RBRACE => Shift(yy_state_1541)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1493(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1541(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(10, NT_structure_item, yy_action_126)
 }
 
 ///|
-fn yy_state_1494(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1542(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1495)
+    T_UIDENT => Shift(yy_state_1543)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1495(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1543(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_1496)
+    T_COLON => Shift(yy_state_1544)
     T_EQUAL => Reduce(6, NT_val_header, yy_action_125)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1496(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1544(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -48786,35 +50145,35 @@ fn yy_state_1496(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_type_ => Shift(yy_state_1497)
+    NT_type_ => Shift(yy_state_1545)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1497(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1545(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(8, NT_val_header, yy_action_124)
 }
 
 ///|
-fn yy_state_1498(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1546(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LIDENT => Shift(yy_state_1499)
+    T_LIDENT => Shift(yy_state_1547)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1499(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1547(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_1500)
+    T_COLON => Shift(yy_state_1548)
     T_EQUAL => Reduce(6, NT_val_header, yy_action_123)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1500(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1548(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -48823,129 +50182,129 @@ fn yy_state_1500(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_type_ => Shift(yy_state_1501)
+    NT_type_ => Shift(yy_state_1549)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1501(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1549(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(8, NT_val_header, yy_action_122)
 }
 
 ///|
-fn yy_state_1502(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1550(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LPAREN => Shift(yy_state_148)
-    NT_parameters => Shift(yy_state_1056)
-    NT_option_parameters_ => Shift(yy_state_1503)
+    NT_parameters => Shift(yy_state_1064)
+    NT_option_parameters_ => Shift(yy_state_1551)
     T_EOF | T_RAISE | T_SEMI | T_THIN_ARROW | T_NORAISE =>
-      Reduce(0, NT_option_parameters_, yy_action_284)
+      Reduce(0, NT_option_parameters_, yy_action_294)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1503(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1551(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_error_annotation => Shift(yy_state_50)
     T_THIN_ARROW => Shift(yy_state_51)
     T_NORAISE => Shift(yy_state_83)
     T_RAISE => Shift(yy_state_84)
-    NT_func_return_type => Shift(yy_state_1504)
-    T_EOF | T_SEMI => Reduce(0, NT_func_return_type, yy_action_850)
+    NT_func_return_type => Shift(yy_state_1552)
+    T_EOF | T_SEMI => Reduce(0, NT_func_return_type, yy_action_862)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1504(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1552(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(7, NT_declare_fun_header, yy_action_121)
 }
 
 ///|
-fn yy_state_1505(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1553(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_FN => Shift(yy_state_1261)
-    NT_fun_header_generic => Shift(yy_state_1506)
+    T_FN => Shift(yy_state_1309)
+    NT_fun_header_generic => Shift(yy_state_1554)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1506(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1554(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LPAREN => Shift(yy_state_148)
-    NT_parameters => Shift(yy_state_1056)
-    NT_option_parameters_ => Shift(yy_state_1507)
+    NT_parameters => Shift(yy_state_1064)
+    NT_option_parameters_ => Shift(yy_state_1555)
     T_EOF | T_RAISE | T_SEMI | T_THIN_ARROW | T_NORAISE =>
-      Reduce(0, NT_option_parameters_, yy_action_284)
+      Reduce(0, NT_option_parameters_, yy_action_294)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1507(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1555(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_error_annotation => Shift(yy_state_50)
     T_THIN_ARROW => Shift(yy_state_51)
     T_NORAISE => Shift(yy_state_83)
     T_RAISE => Shift(yy_state_84)
-    NT_func_return_type => Shift(yy_state_1508)
-    T_EOF | T_SEMI => Reduce(0, NT_func_return_type, yy_action_850)
+    NT_func_return_type => Shift(yy_state_1556)
+    T_EOF | T_SEMI => Reduce(0, NT_func_return_type, yy_action_862)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1508(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1556(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(8, NT_declare_fun_header, yy_action_120)
 }
 
 ///|
-fn yy_state_1509(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1557(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_FN => Shift(yy_state_1261)
-    T_SUBERROR => Shift(yy_state_1510)
-    T_TYPE => Shift(yy_state_1512)
-    T_IMPL => Shift(yy_state_1515)
-    T_TRAIT => Shift(yy_state_1520)
-    T_CONST => Shift(yy_state_1526)
-    T_LET => Shift(yy_state_1530)
-    NT_fun_header_generic => Shift(yy_state_1534)
-    T_ASYNC => Shift(yy_state_1537)
+    T_FN => Shift(yy_state_1309)
+    T_SUBERROR => Shift(yy_state_1558)
+    T_TYPE => Shift(yy_state_1560)
+    T_IMPL => Shift(yy_state_1563)
+    T_TRAIT => Shift(yy_state_1568)
+    T_CONST => Shift(yy_state_1574)
+    T_LET => Shift(yy_state_1578)
+    NT_fun_header_generic => Shift(yy_state_1582)
+    T_ASYNC => Shift(yy_state_1585)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1510(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1558(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1511)
+    T_UIDENT => Shift(yy_state_1559)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1511(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1559(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(5, NT_suberror_header, yy_action_119)
 }
 
 ///|
-fn yy_state_1512(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1560(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1513)
+    T_UIDENT => Shift(yy_state_1561)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1513(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1561(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACKET => Shift(yy_state_849)
+    T_LBRACKET => Shift(yy_state_857)
     NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__ =>
-      Shift(yy_state_860)
-    NT_optional_type_parameters_no_constraints => Shift(yy_state_1514)
+      Shift(yy_state_868)
+    NT_optional_type_parameters_no_constraints => Shift(yy_state_1562)
     T_UIDENT
     | T_EOF
     | T_DERIVE
@@ -48959,52 +50318,52 @@ fn yy_state_1513(_lookahead : YYSymbol) -> YYDecision {
       Reduce(
         0,
         NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__,
-        yy_action_384,
+        yy_action_394,
       )
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1514(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1562(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(6, NT_type_header, yy_action_118)
 }
 
 ///|
-fn yy_state_1515(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1563(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_type_parameters => Shift(yy_state_895)
-    NT_option_type_parameters_ => Shift(yy_state_935)
-    T_LBRACKET => Shift(yy_state_936)
-    NT_optional_type_parameters => Shift(yy_state_1516)
+    NT_type_parameters => Shift(yy_state_903)
+    NT_option_type_parameters_ => Shift(yy_state_943)
+    T_LBRACKET => Shift(yy_state_944)
+    NT_optional_type_parameters => Shift(yy_state_1564)
     T_UIDENT | T_AMPER | T_PACKAGE_NAME =>
-      Reduce(0, NT_option_type_parameters_, yy_action_356)
+      Reduce(0, NT_option_type_parameters_, yy_action_366)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1516(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1564(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_AMPER => Shift(yy_state_18)
     T_PACKAGE_NAME => Shift(yy_state_20)
     T_UIDENT => Shift(yy_state_23)
     NT_qual_ident_ty => Shift(yy_state_24)
-    NT_type_name => Shift(yy_state_1517)
+    NT_type_name => Shift(yy_state_1565)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1517(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1565(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_FOR => Shift(yy_state_1518)
+    T_FOR => Shift(yy_state_1566)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1518(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1566(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -49013,95 +50372,95 @@ fn yy_state_1518(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_type_ => Shift(yy_state_1519)
+    NT_type_ => Shift(yy_state_1567)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1519(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1567(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(8, NT_structure_item, yy_action_117)
 }
 
 ///|
-fn yy_state_1520(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1568(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1521)
+    T_UIDENT => Shift(yy_state_1569)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1521(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1569(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_1089)
+    T_COLON => Shift(yy_state_1097)
     NT_option_preceded_COLON_separated_nonempty_list_PLUS_tvar_constraint___ =>
-      Shift(yy_state_1522)
+      Shift(yy_state_1570)
     T_LBRACE =>
       Reduce(
         0,
         NT_option_preceded_COLON_separated_nonempty_list_PLUS_tvar_constraint___,
-        yy_action_268,
+        yy_action_278,
       )
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1522(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1570(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACE => Shift(yy_state_1523)
+    T_LBRACE => Shift(yy_state_1571)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1523(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1571(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_ATTRIBUTE => Shift(yy_state_845)
-    NT_trait_method_decl => Shift(yy_state_1093)
-    NT_non_empty_list_attribute_ => Shift(yy_state_1097)
-    T_LIDENT => Shift(yy_state_1134)
-    T_ASYNC => Shift(yy_state_1142)
-    NT_non_empty_list_semis_trait_method_decl_ => Shift(yy_state_1151)
-    NT_list_semis_trait_method_decl_ => Shift(yy_state_1524)
-    T_RBRACE => Reduce(0, NT_list_semis_trait_method_decl_, yy_action_265)
+    T_ATTRIBUTE => Shift(yy_state_853)
+    NT_trait_method_decl => Shift(yy_state_1101)
+    NT_non_empty_list_attribute_ => Shift(yy_state_1105)
+    T_LIDENT => Shift(yy_state_1142)
+    T_ASYNC => Shift(yy_state_1150)
+    NT_non_empty_list_semis_trait_method_decl_ => Shift(yy_state_1159)
+    NT_list_semis_trait_method_decl_ => Shift(yy_state_1572)
+    T_RBRACE => Reduce(0, NT_list_semis_trait_method_decl_, yy_action_275)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1524(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1572(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RBRACE => Shift(yy_state_1525)
+    T_RBRACE => Shift(yy_state_1573)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1525(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1573(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(9, NT_structure_item, yy_action_116)
 }
 
 ///|
-fn yy_state_1526(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1574(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1527)
+    T_UIDENT => Shift(yy_state_1575)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1527(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1575(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_1528)
+    T_COLON => Shift(yy_state_1576)
     T_EQUAL => Reduce(5, NT_val_header, yy_action_115)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1528(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1576(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -49110,35 +50469,35 @@ fn yy_state_1528(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_type_ => Shift(yy_state_1529)
+    NT_type_ => Shift(yy_state_1577)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1529(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1577(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(7, NT_val_header, yy_action_114)
 }
 
 ///|
-fn yy_state_1530(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1578(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LIDENT => Shift(yy_state_1531)
+    T_LIDENT => Shift(yy_state_1579)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1531(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1579(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_1532)
+    T_COLON => Shift(yy_state_1580)
     T_EQUAL => Reduce(5, NT_val_header, yy_action_113)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1532(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1580(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -49147,159 +50506,159 @@ fn yy_state_1532(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_type_ => Shift(yy_state_1533)
+    NT_type_ => Shift(yy_state_1581)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1533(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1581(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(7, NT_val_header, yy_action_111)
 }
 
 ///|
-fn yy_state_1534(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1582(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LPAREN => Shift(yy_state_148)
-    NT_parameters => Shift(yy_state_1056)
-    NT_option_parameters_ => Shift(yy_state_1535)
+    NT_parameters => Shift(yy_state_1064)
+    NT_option_parameters_ => Shift(yy_state_1583)
     T_EOF | T_RAISE | T_SEMI | T_THIN_ARROW | T_NORAISE =>
-      Reduce(0, NT_option_parameters_, yy_action_284)
+      Reduce(0, NT_option_parameters_, yy_action_294)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1535(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1583(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_error_annotation => Shift(yy_state_50)
     T_THIN_ARROW => Shift(yy_state_51)
     T_NORAISE => Shift(yy_state_83)
     T_RAISE => Shift(yy_state_84)
-    NT_func_return_type => Shift(yy_state_1536)
-    T_EOF | T_SEMI => Reduce(0, NT_func_return_type, yy_action_850)
+    NT_func_return_type => Shift(yy_state_1584)
+    T_EOF | T_SEMI => Reduce(0, NT_func_return_type, yy_action_862)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1536(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1584(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(6, NT_declare_fun_header, yy_action_110)
 }
 
 ///|
-fn yy_state_1537(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1585(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_FN => Shift(yy_state_1261)
-    NT_fun_header_generic => Shift(yy_state_1538)
+    T_FN => Shift(yy_state_1309)
+    NT_fun_header_generic => Shift(yy_state_1586)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1538(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1586(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LPAREN => Shift(yy_state_148)
-    NT_parameters => Shift(yy_state_1056)
-    NT_option_parameters_ => Shift(yy_state_1539)
+    NT_parameters => Shift(yy_state_1064)
+    NT_option_parameters_ => Shift(yy_state_1587)
     T_EOF | T_RAISE | T_SEMI | T_THIN_ARROW | T_NORAISE =>
-      Reduce(0, NT_option_parameters_, yy_action_284)
+      Reduce(0, NT_option_parameters_, yy_action_294)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1539(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1587(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_error_annotation => Shift(yy_state_50)
     T_THIN_ARROW => Shift(yy_state_51)
     T_NORAISE => Shift(yy_state_83)
     T_RAISE => Shift(yy_state_84)
-    NT_func_return_type => Shift(yy_state_1540)
-    T_EOF | T_SEMI => Reduce(0, NT_func_return_type, yy_action_850)
+    NT_func_return_type => Shift(yy_state_1588)
+    T_EOF | T_SEMI => Reduce(0, NT_func_return_type, yy_action_862)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1540(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1588(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(7, NT_declare_fun_header, yy_action_109)
 }
 
 ///|
-fn yy_state_1541(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1589(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LPAREN => Shift(yy_state_148)
-    NT_parameters => Shift(yy_state_1056)
-    NT_option_parameters_ => Shift(yy_state_1542)
+    NT_parameters => Shift(yy_state_1064)
+    NT_option_parameters_ => Shift(yy_state_1590)
     T_EOF | T_RAISE | T_SEMI | T_THIN_ARROW | T_NORAISE =>
-      Reduce(0, NT_option_parameters_, yy_action_284)
+      Reduce(0, NT_option_parameters_, yy_action_294)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1542(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1590(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_error_annotation => Shift(yy_state_50)
     T_THIN_ARROW => Shift(yy_state_51)
     T_NORAISE => Shift(yy_state_83)
     T_RAISE => Shift(yy_state_84)
-    NT_func_return_type => Shift(yy_state_1543)
-    T_EOF | T_SEMI => Reduce(0, NT_func_return_type, yy_action_850)
+    NT_func_return_type => Shift(yy_state_1591)
+    T_EOF | T_SEMI => Reduce(0, NT_func_return_type, yy_action_862)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1543(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1591(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(5, NT_declare_fun_header, yy_action_108)
 }
 
 ///|
-fn yy_state_1544(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1592(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_FN => Shift(yy_state_1261)
-    NT_fun_header_generic => Shift(yy_state_1545)
+    T_FN => Shift(yy_state_1309)
+    NT_fun_header_generic => Shift(yy_state_1593)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1545(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1593(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LPAREN => Shift(yy_state_148)
-    NT_parameters => Shift(yy_state_1056)
-    NT_option_parameters_ => Shift(yy_state_1546)
+    NT_parameters => Shift(yy_state_1064)
+    NT_option_parameters_ => Shift(yy_state_1594)
     T_EOF | T_RAISE | T_SEMI | T_THIN_ARROW | T_NORAISE =>
-      Reduce(0, NT_option_parameters_, yy_action_284)
+      Reduce(0, NT_option_parameters_, yy_action_294)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1546(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1594(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_error_annotation => Shift(yy_state_50)
     T_THIN_ARROW => Shift(yy_state_51)
     T_NORAISE => Shift(yy_state_83)
     T_RAISE => Shift(yy_state_84)
-    NT_func_return_type => Shift(yy_state_1547)
-    T_EOF | T_SEMI => Reduce(0, NT_func_return_type, yy_action_850)
+    NT_func_return_type => Shift(yy_state_1595)
+    T_EOF | T_SEMI => Reduce(0, NT_func_return_type, yy_action_862)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1547(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1595(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(6, NT_declare_fun_header, yy_action_107)
 }
 
 ///|
-fn yy_state_1548(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1596(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LPAREN => Shift(yy_state_1012)
-    NT_pub_attr => Shift(yy_state_1549)
+    T_LPAREN => Shift(yy_state_1020)
+    NT_pub_attr => Shift(yy_state_1597)
     T_EXTERN
     | T_STRUCT
     | T_ENUM
@@ -49315,123 +50674,123 @@ fn yy_state_1548(_lookahead : YYSymbol) -> YYDecision {
     | T_USING
     | T_TYPE
     | T_SUBERROR
-    | T_ENUMVIEW => Reduce(0, NT_pub_attr, yy_action_300)
+    | T_ENUMVIEW => Reduce(0, NT_pub_attr, yy_action_310)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1549(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1597(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_FN => Shift(yy_state_1261)
-    T_ENUM => Shift(yy_state_1550)
-    T_STRUCT => Shift(yy_state_1553)
-    T_SUBERROR => Shift(yy_state_1556)
-    T_TYPE => Shift(yy_state_1558)
-    T_USING => Shift(yy_state_1561)
-    T_ENUMVIEW => Shift(yy_state_1566)
-    T_IMPL => Shift(yy_state_1578)
-    T_TRAITALIAS => Shift(yy_state_1595)
-    T_TYPEALIAS => Shift(yy_state_1597)
-    T_TRAIT => Shift(yy_state_1603)
-    T_FNALIAS => Shift(yy_state_1609)
-    T_CONST => Shift(yy_state_1611)
-    T_LET => Shift(yy_state_1615)
-    T_EXTERN => Shift(yy_state_1619)
-    NT_fun_header_generic => Shift(yy_state_1631)
-    T_ASYNC => Shift(yy_state_1634)
+    T_FN => Shift(yy_state_1309)
+    T_ENUM => Shift(yy_state_1598)
+    T_STRUCT => Shift(yy_state_1601)
+    T_SUBERROR => Shift(yy_state_1604)
+    T_TYPE => Shift(yy_state_1606)
+    T_USING => Shift(yy_state_1609)
+    T_ENUMVIEW => Shift(yy_state_1614)
+    T_IMPL => Shift(yy_state_1626)
+    T_TRAITALIAS => Shift(yy_state_1643)
+    T_TYPEALIAS => Shift(yy_state_1645)
+    T_TRAIT => Shift(yy_state_1651)
+    T_FNALIAS => Shift(yy_state_1657)
+    T_CONST => Shift(yy_state_1659)
+    T_LET => Shift(yy_state_1663)
+    T_EXTERN => Shift(yy_state_1667)
+    NT_fun_header_generic => Shift(yy_state_1679)
+    T_ASYNC => Shift(yy_state_1682)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1550(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1598(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1551)
+    T_UIDENT => Shift(yy_state_1599)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1551(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1599(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACKET => Shift(yy_state_849)
+    T_LBRACKET => Shift(yy_state_857)
     NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__ =>
-      Shift(yy_state_860)
-    NT_optional_type_parameters_no_constraints => Shift(yy_state_1552)
+      Shift(yy_state_868)
+    NT_optional_type_parameters_no_constraints => Shift(yy_state_1600)
     T_LBRACE =>
       Reduce(
         0,
         NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__,
-        yy_action_384,
+        yy_action_394,
       )
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1552(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1600(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(6, NT_enum_header, yy_action_106)
 }
 
 ///|
-fn yy_state_1553(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1601(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1554)
+    T_UIDENT => Shift(yy_state_1602)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1554(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1602(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACKET => Shift(yy_state_849)
+    T_LBRACKET => Shift(yy_state_857)
     NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__ =>
-      Shift(yy_state_860)
-    NT_optional_type_parameters_no_constraints => Shift(yy_state_1555)
+      Shift(yy_state_868)
+    NT_optional_type_parameters_no_constraints => Shift(yy_state_1603)
     T_LPAREN | T_LBRACE =>
       Reduce(
         0,
         NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__,
-        yy_action_384,
+        yy_action_394,
       )
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1555(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1603(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(6, NT_struct_header, yy_action_105)
 }
 
 ///|
-fn yy_state_1556(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1604(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1557)
+    T_UIDENT => Shift(yy_state_1605)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1557(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1605(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(5, NT_suberror_header, yy_action_104)
 }
 
 ///|
-fn yy_state_1558(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1606(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1559)
+    T_UIDENT => Shift(yy_state_1607)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1559(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1607(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACKET => Shift(yy_state_849)
+    T_LBRACKET => Shift(yy_state_857)
     NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__ =>
-      Shift(yy_state_860)
-    NT_optional_type_parameters_no_constraints => Shift(yy_state_1560)
+      Shift(yy_state_868)
+    NT_optional_type_parameters_no_constraints => Shift(yy_state_1608)
     T_UIDENT
     | T_EOF
     | T_DERIVE
@@ -49445,122 +50804,122 @@ fn yy_state_1559(_lookahead : YYSymbol) -> YYDecision {
       Reduce(
         0,
         NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__,
-        yy_action_384,
+        yy_action_394,
       )
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1560(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1608(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(6, NT_type_header, yy_action_103)
 }
 
 ///|
-fn yy_state_1561(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1609(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_PACKAGE_NAME => Shift(yy_state_1562)
+    T_PACKAGE_NAME => Shift(yy_state_1610)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1562(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1610(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACE => Shift(yy_state_1563)
+    T_LBRACE => Shift(yy_state_1611)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1563(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1611(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_using_binder => Shift(yy_state_872)
-    NT_non_empty_list_commas_rev_using_binder_ => Shift(yy_state_873)
-    T_TRAIT => Shift(yy_state_877)
-    T_TYPE => Shift(yy_state_881)
-    T_UIDENT => Shift(yy_state_885)
-    T_LIDENT => Shift(yy_state_888)
-    NT_non_empty_list_commas_using_binder_ => Shift(yy_state_891)
-    NT_list_commas_using_binder_ => Shift(yy_state_1564)
-    T_RBRACE => Reduce(0, NT_list_commas_using_binder_, yy_action_370)
+    NT_using_binder => Shift(yy_state_880)
+    NT_non_empty_list_commas_rev_using_binder_ => Shift(yy_state_881)
+    T_TRAIT => Shift(yy_state_885)
+    T_TYPE => Shift(yy_state_889)
+    T_UIDENT => Shift(yy_state_893)
+    T_LIDENT => Shift(yy_state_896)
+    NT_non_empty_list_commas_using_binder_ => Shift(yy_state_899)
+    NT_list_commas_using_binder_ => Shift(yy_state_1612)
+    T_RBRACE => Reduce(0, NT_list_commas_using_binder_, yy_action_380)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1564(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1612(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RBRACE => Shift(yy_state_1565)
+    T_RBRACE => Shift(yy_state_1613)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1565(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1613(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(8, NT_structure_item, yy_action_102)
 }
 
 ///|
-fn yy_state_1566(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1614(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_type_parameters => Shift(yy_state_895)
-    NT_option_type_parameters_ => Shift(yy_state_935)
-    T_LBRACKET => Shift(yy_state_936)
-    NT_optional_type_parameters => Shift(yy_state_1567)
-    T_UIDENT => Reduce(0, NT_option_type_parameters_, yy_action_356)
+    NT_type_parameters => Shift(yy_state_903)
+    NT_option_type_parameters_ => Shift(yy_state_943)
+    T_LBRACKET => Shift(yy_state_944)
+    NT_optional_type_parameters => Shift(yy_state_1615)
+    T_UIDENT => Reduce(0, NT_option_type_parameters_, yy_action_366)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1567(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1615(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1568)
+    T_UIDENT => Shift(yy_state_1616)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1568(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1616(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACE => Shift(yy_state_1569)
+    T_LBRACE => Shift(yy_state_1617)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1569(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1617(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_ATTRIBUTE => Shift(yy_state_845)
-    NT_enum_constructor => Shift(yy_state_899)
-    NT_non_empty_list_attribute_ => Shift(yy_state_903)
-    T_UIDENT => Shift(yy_state_923)
-    NT_non_empty_list_semis_enum_constructor_ => Shift(yy_state_926)
-    NT_list_semis_enum_constructor_ => Shift(yy_state_1570)
-    T_RBRACE => Reduce(0, NT_list_semis_enum_constructor_, yy_action_354)
+    T_ATTRIBUTE => Shift(yy_state_853)
+    NT_enum_constructor => Shift(yy_state_907)
+    NT_non_empty_list_attribute_ => Shift(yy_state_911)
+    T_UIDENT => Shift(yy_state_931)
+    NT_non_empty_list_semis_enum_constructor_ => Shift(yy_state_934)
+    NT_list_semis_enum_constructor_ => Shift(yy_state_1618)
+    T_RBRACE => Reduce(0, NT_list_semis_enum_constructor_, yy_action_364)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1570(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1618(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RBRACE => Shift(yy_state_1571)
+    T_RBRACE => Shift(yy_state_1619)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1571(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1619(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_FOR => Shift(yy_state_1572)
+    T_FOR => Shift(yy_state_1620)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1572(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1620(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -49569,142 +50928,142 @@ fn yy_state_1572(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_type_ => Shift(yy_state_1573)
+    NT_type_ => Shift(yy_state_1621)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1573(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1621(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_WITH => Shift(yy_state_1574)
+    T_WITH => Shift(yy_state_1622)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1574(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1622(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LIDENT => Shift(yy_state_1575)
+    T_LIDENT => Shift(yy_state_1623)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1575(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1623(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LPAREN => Shift(yy_state_148)
-    NT_parameters => Shift(yy_state_1576)
+    NT_parameters => Shift(yy_state_1624)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1576(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1624(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LBRACE => Shift(yy_state_124)
-    NT_block_expr => Shift(yy_state_1577)
+    NT_block_expr => Shift(yy_state_1625)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1577(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1625(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(15, NT_structure_item, yy_action_101)
 }
 
 ///|
-fn yy_state_1578(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1626(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_type_parameters => Shift(yy_state_895)
-    NT_option_type_parameters_ => Shift(yy_state_935)
-    T_LBRACKET => Shift(yy_state_936)
-    NT_optional_type_parameters => Shift(yy_state_1579)
+    NT_type_parameters => Shift(yy_state_903)
+    NT_option_type_parameters_ => Shift(yy_state_943)
+    T_LBRACKET => Shift(yy_state_944)
+    NT_optional_type_parameters => Shift(yy_state_1627)
     T_UIDENT | T_AMPER | T_PACKAGE_NAME =>
-      Reduce(0, NT_option_type_parameters_, yy_action_356)
+      Reduce(0, NT_option_type_parameters_, yy_action_366)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1579(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1627(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_AMPER => Shift(yy_state_18)
     T_PACKAGE_NAME => Shift(yy_state_20)
     T_UIDENT => Shift(yy_state_23)
     NT_qual_ident_ty => Shift(yy_state_24)
-    NT_type_name => Shift(yy_state_1580)
+    NT_type_name => Shift(yy_state_1628)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1580(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1628(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_WITH => Shift(yy_state_1581)
-    T_FOR => Shift(yy_state_1587)
+    T_WITH => Shift(yy_state_1629)
+    T_FOR => Shift(yy_state_1635)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1581(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1629(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LIDENT => Shift(yy_state_1582)
+    T_LIDENT => Shift(yy_state_1630)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1582(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1630(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_EXCLAMATION => Shift(yy_state_726)
-    NT_optional_bang => Shift(yy_state_1583)
-    T_LPAREN => Reduce(0, NT_optional_bang, yy_action_851)
+    T_EXCLAMATION => Shift(yy_state_734)
+    NT_optional_bang => Shift(yy_state_1631)
+    T_LPAREN => Reduce(0, NT_optional_bang, yy_action_863)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1583(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1631(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LPAREN => Shift(yy_state_148)
-    NT_parameters => Shift(yy_state_1584)
+    NT_parameters => Shift(yy_state_1632)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1584(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1632(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_error_annotation => Shift(yy_state_50)
     T_THIN_ARROW => Shift(yy_state_51)
     T_NORAISE => Shift(yy_state_83)
     T_RAISE => Shift(yy_state_84)
-    NT_func_return_type => Shift(yy_state_1585)
-    T_EQUAL | T_LBRACE => Reduce(0, NT_func_return_type, yy_action_850)
+    NT_func_return_type => Shift(yy_state_1633)
+    T_EQUAL | T_LBRACE => Reduce(0, NT_func_return_type, yy_action_862)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1585(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1633(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_EQUAL => Shift(yy_state_960)
-    NT_block_expr_with_local_types => Shift(yy_state_962)
-    T_LBRACE => Shift(yy_state_963)
-    NT_impl_body => Shift(yy_state_1586)
+    T_EQUAL => Shift(yy_state_968)
+    NT_block_expr_with_local_types => Shift(yy_state_970)
+    T_LBRACE => Shift(yy_state_971)
+    NT_impl_body => Shift(yy_state_1634)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1586(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1634(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(12, NT_structure_item, yy_action_100)
 }
 
 ///|
-fn yy_state_1587(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1635(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -49713,252 +51072,252 @@ fn yy_state_1587(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_type_ => Shift(yy_state_1588)
+    NT_type_ => Shift(yy_state_1636)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1588(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1636(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_WITH => Shift(yy_state_1589)
+    T_WITH => Shift(yy_state_1637)
     T_EOF | T_SEMI => Reduce(8, NT_structure_item, yy_action_99)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1589(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1637(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LIDENT => Shift(yy_state_1590)
+    T_LIDENT => Shift(yy_state_1638)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1590(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1638(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_EXCLAMATION => Shift(yy_state_726)
-    NT_optional_bang => Shift(yy_state_1591)
-    T_LPAREN => Reduce(0, NT_optional_bang, yy_action_851)
+    T_EXCLAMATION => Shift(yy_state_734)
+    NT_optional_bang => Shift(yy_state_1639)
+    T_LPAREN => Reduce(0, NT_optional_bang, yy_action_863)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1591(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1639(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LPAREN => Shift(yy_state_148)
-    NT_parameters => Shift(yy_state_1592)
+    NT_parameters => Shift(yy_state_1640)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1592(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1640(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_error_annotation => Shift(yy_state_50)
     T_THIN_ARROW => Shift(yy_state_51)
     T_NORAISE => Shift(yy_state_83)
     T_RAISE => Shift(yy_state_84)
-    NT_func_return_type => Shift(yy_state_1593)
-    T_EQUAL | T_LBRACE => Reduce(0, NT_func_return_type, yy_action_850)
+    NT_func_return_type => Shift(yy_state_1641)
+    T_EQUAL | T_LBRACE => Reduce(0, NT_func_return_type, yy_action_862)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1593(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1641(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_EQUAL => Shift(yy_state_960)
-    NT_block_expr_with_local_types => Shift(yy_state_962)
-    T_LBRACE => Shift(yy_state_963)
-    NT_impl_body => Shift(yy_state_1594)
+    T_EQUAL => Shift(yy_state_968)
+    NT_block_expr_with_local_types => Shift(yy_state_970)
+    T_LBRACE => Shift(yy_state_971)
+    NT_impl_body => Shift(yy_state_1642)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1594(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1642(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(14, NT_structure_item, yy_action_98)
 }
 
 ///|
-fn yy_state_1595(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1643(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1060)
-    NT_batch_type_alias_target_UIDENT_ => Shift(yy_state_1063)
-    T_PACKAGE_NAME => Shift(yy_state_1064)
-    NT_batch_type_alias_targets => Shift(yy_state_1596)
+    T_UIDENT => Shift(yy_state_1068)
+    NT_batch_type_alias_target_UIDENT_ => Shift(yy_state_1071)
+    T_PACKAGE_NAME => Shift(yy_state_1072)
+    NT_batch_type_alias_targets => Shift(yy_state_1644)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1596(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1644(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(5, NT_structure_item, yy_action_97)
 }
 
 ///|
-fn yy_state_1597(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1645(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
     T_AMPER => Shift(yy_state_58)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_batch_type_alias_target_UIDENT_ => Shift(yy_state_1063)
-    T_UIDENT => Shift(yy_state_1079)
-    T_PACKAGE_NAME => Shift(yy_state_1080)
-    NT_type_ => Shift(yy_state_1598)
-    NT_batch_type_alias_targets => Shift(yy_state_1602)
+    NT_batch_type_alias_target_UIDENT_ => Shift(yy_state_1071)
+    T_UIDENT => Shift(yy_state_1087)
+    T_PACKAGE_NAME => Shift(yy_state_1088)
+    NT_type_ => Shift(yy_state_1646)
+    NT_batch_type_alias_targets => Shift(yy_state_1650)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1598(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1646(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_AS => Shift(yy_state_1599)
+    T_AS => Shift(yy_state_1647)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1599(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1647(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1600)
+    T_UIDENT => Shift(yy_state_1648)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1600(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1648(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACKET => Shift(yy_state_849)
+    T_LBRACKET => Shift(yy_state_857)
     NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__ =>
-      Shift(yy_state_860)
-    NT_optional_type_parameters_no_constraints => Shift(yy_state_1601)
+      Shift(yy_state_868)
+    NT_optional_type_parameters_no_constraints => Shift(yy_state_1649)
     T_EOF | T_SEMI =>
       Reduce(
         0,
         NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__,
-        yy_action_384,
+        yy_action_394,
       )
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1601(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1649(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(8, NT_structure_item, yy_action_96)
 }
 
 ///|
-fn yy_state_1602(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1650(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(5, NT_structure_item, yy_action_95)
 }
 
 ///|
-fn yy_state_1603(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1651(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1604)
+    T_UIDENT => Shift(yy_state_1652)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1604(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1652(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_1089)
+    T_COLON => Shift(yy_state_1097)
     NT_option_preceded_COLON_separated_nonempty_list_PLUS_tvar_constraint___ =>
-      Shift(yy_state_1605)
+      Shift(yy_state_1653)
     T_LBRACE =>
       Reduce(
         0,
         NT_option_preceded_COLON_separated_nonempty_list_PLUS_tvar_constraint___,
-        yy_action_268,
+        yy_action_278,
       )
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1605(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1653(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACE => Shift(yy_state_1606)
+    T_LBRACE => Shift(yy_state_1654)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1606(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1654(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_ATTRIBUTE => Shift(yy_state_845)
-    NT_trait_method_decl => Shift(yy_state_1093)
-    NT_non_empty_list_attribute_ => Shift(yy_state_1097)
-    T_LIDENT => Shift(yy_state_1134)
-    T_ASYNC => Shift(yy_state_1142)
-    NT_non_empty_list_semis_trait_method_decl_ => Shift(yy_state_1151)
-    NT_list_semis_trait_method_decl_ => Shift(yy_state_1607)
-    T_RBRACE => Reduce(0, NT_list_semis_trait_method_decl_, yy_action_265)
+    T_ATTRIBUTE => Shift(yy_state_853)
+    NT_trait_method_decl => Shift(yy_state_1101)
+    NT_non_empty_list_attribute_ => Shift(yy_state_1105)
+    T_LIDENT => Shift(yy_state_1142)
+    T_ASYNC => Shift(yy_state_1150)
+    NT_non_empty_list_semis_trait_method_decl_ => Shift(yy_state_1159)
+    NT_list_semis_trait_method_decl_ => Shift(yy_state_1655)
+    T_RBRACE => Reduce(0, NT_list_semis_trait_method_decl_, yy_action_275)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1607(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1655(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RBRACE => Shift(yy_state_1608)
+    T_RBRACE => Shift(yy_state_1656)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1608(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1656(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(9, NT_structure_item, yy_action_94)
 }
 
 ///|
-fn yy_state_1609(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1657(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1155)
-    T_LIDENT => Shift(yy_state_1157)
-    NT_option_func_alias_type_name_LIDENT_UIDENT__ => Shift(yy_state_1162)
-    T_PACKAGE_NAME => Shift(yy_state_1172)
-    NT_func_alias_type_name_LIDENT_UIDENT_ => Shift(yy_state_1187)
-    NT_func_alias_target_LIDENT_ => Shift(yy_state_1189)
-    NT_func_alias_targets => Shift(yy_state_1610)
+    T_UIDENT => Shift(yy_state_1163)
+    T_LIDENT => Shift(yy_state_1165)
+    NT_option_func_alias_type_name_LIDENT_UIDENT__ => Shift(yy_state_1170)
+    T_PACKAGE_NAME => Shift(yy_state_1180)
+    NT_func_alias_type_name_LIDENT_UIDENT_ => Shift(yy_state_1195)
+    NT_func_alias_target_LIDENT_ => Shift(yy_state_1197)
+    NT_func_alias_targets => Shift(yy_state_1658)
     T_LPAREN =>
-      Reduce(0, NT_option_func_alias_type_name_LIDENT_UIDENT__, yy_action_243)
+      Reduce(0, NT_option_func_alias_type_name_LIDENT_UIDENT__, yy_action_253)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1610(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1658(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(5, NT_structure_item, yy_action_93)
 }
 
 ///|
-fn yy_state_1611(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1659(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1612)
+    T_UIDENT => Shift(yy_state_1660)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1612(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1660(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_1613)
+    T_COLON => Shift(yy_state_1661)
     T_EQUAL => Reduce(5, NT_val_header, yy_action_92)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1613(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1661(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -49967,35 +51326,35 @@ fn yy_state_1613(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_type_ => Shift(yy_state_1614)
+    NT_type_ => Shift(yy_state_1662)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1614(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1662(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(7, NT_val_header, yy_action_91)
 }
 
 ///|
-fn yy_state_1615(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1663(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LIDENT => Shift(yy_state_1616)
+    T_LIDENT => Shift(yy_state_1664)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1616(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1664(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_1617)
+    T_COLON => Shift(yy_state_1665)
     T_EQUAL => Reduce(5, NT_val_header, yy_action_90)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1617(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1665(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -50004,322 +51363,322 @@ fn yy_state_1617(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_type_ => Shift(yy_state_1618)
+    NT_type_ => Shift(yy_state_1666)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1618(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1666(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(7, NT_val_header, yy_action_89)
 }
 
 ///|
-fn yy_state_1619(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1667(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_TYPE => Shift(yy_state_1620)
-    T_STRING => Shift(yy_state_1624)
+    T_TYPE => Shift(yy_state_1668)
+    T_STRING => Shift(yy_state_1672)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1620(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1668(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1621)
+    T_UIDENT => Shift(yy_state_1669)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1621(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1669(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACKET => Shift(yy_state_849)
+    T_LBRACKET => Shift(yy_state_857)
     NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__ =>
-      Shift(yy_state_860)
-    NT_optional_type_parameters_no_constraints => Shift(yy_state_1622)
+      Shift(yy_state_868)
+    NT_optional_type_parameters_no_constraints => Shift(yy_state_1670)
     T_EOF | T_DERIVE | T_SEMI =>
       Reduce(
         0,
         NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__,
-        yy_action_384,
+        yy_action_394,
       )
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1622(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1670(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_DERIVE => Shift(yy_state_973)
-    NT_deriving_directive_list => Shift(yy_state_1623)
-    T_EOF | T_SEMI => Reduce(0, NT_deriving_directive_list, yy_action_315)
+    T_DERIVE => Shift(yy_state_981)
+    NT_deriving_directive_list => Shift(yy_state_1671)
+    T_EOF | T_SEMI => Reduce(0, NT_deriving_directive_list, yy_action_325)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1623(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1671(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(8, NT_structure_item, yy_action_88)
 }
 
 ///|
-fn yy_state_1624(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1672(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_FN => Shift(yy_state_1625)
+    T_FN => Shift(yy_state_1673)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1625(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1673(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_AMPER => Shift(yy_state_18)
     T_PACKAGE_NAME => Shift(yy_state_20)
     T_UIDENT => Shift(yy_state_23)
     NT_qual_ident_ty => Shift(yy_state_24)
-    T_LIDENT => Shift(yy_state_1257)
-    NT_type_name => Shift(yy_state_1258)
-    NT_fun_binder => Shift(yy_state_1626)
+    T_LIDENT => Shift(yy_state_1305)
+    NT_type_name => Shift(yy_state_1306)
+    NT_fun_binder => Shift(yy_state_1674)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1626(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1674(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_EXCLAMATION => Shift(yy_state_726)
-    NT_optional_bang => Shift(yy_state_1627)
+    T_EXCLAMATION => Shift(yy_state_734)
+    NT_optional_bang => Shift(yy_state_1675)
     T_RAISE | T_EQUAL | T_LPAREN | T_LBRACKET | T_THIN_ARROW | T_NORAISE =>
-      Reduce(0, NT_optional_bang, yy_action_851)
+      Reduce(0, NT_optional_bang, yy_action_863)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1627(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1675(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_type_parameters => Shift(yy_state_895)
-    NT_option_type_parameters_ => Shift(yy_state_935)
-    T_LBRACKET => Shift(yy_state_936)
-    NT_optional_type_parameters => Shift(yy_state_1628)
+    NT_type_parameters => Shift(yy_state_903)
+    NT_option_type_parameters_ => Shift(yy_state_943)
+    T_LBRACKET => Shift(yy_state_944)
+    NT_optional_type_parameters => Shift(yy_state_1676)
     T_RAISE | T_EQUAL | T_LPAREN | T_THIN_ARROW | T_NORAISE =>
-      Reduce(0, NT_option_type_parameters_, yy_action_356)
+      Reduce(0, NT_option_type_parameters_, yy_action_366)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1628(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1676(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LPAREN => Shift(yy_state_148)
-    NT_parameters => Shift(yy_state_1056)
-    NT_option_parameters_ => Shift(yy_state_1629)
+    NT_parameters => Shift(yy_state_1064)
+    NT_option_parameters_ => Shift(yy_state_1677)
     T_RAISE | T_EQUAL | T_THIN_ARROW | T_NORAISE =>
-      Reduce(0, NT_option_parameters_, yy_action_284)
+      Reduce(0, NT_option_parameters_, yy_action_294)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1629(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1677(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_error_annotation => Shift(yy_state_50)
     T_THIN_ARROW => Shift(yy_state_51)
     T_NORAISE => Shift(yy_state_83)
     T_RAISE => Shift(yy_state_84)
-    NT_func_return_type => Shift(yy_state_1630)
-    T_EQUAL => Reduce(0, NT_func_return_type, yy_action_850)
+    NT_func_return_type => Shift(yy_state_1678)
+    T_EQUAL => Reduce(0, NT_func_return_type, yy_action_862)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1630(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1678(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(11, NT_extern_fun_header, yy_action_87)
 }
 
 ///|
-fn yy_state_1631(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1679(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LPAREN => Shift(yy_state_148)
-    NT_parameters => Shift(yy_state_1056)
-    NT_option_parameters_ => Shift(yy_state_1632)
+    NT_parameters => Shift(yy_state_1064)
+    NT_option_parameters_ => Shift(yy_state_1680)
     T_RAISE | T_EQUAL | T_LBRACE | T_THIN_ARROW | T_NORAISE =>
-      Reduce(0, NT_option_parameters_, yy_action_284)
+      Reduce(0, NT_option_parameters_, yy_action_294)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1632(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1680(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_error_annotation => Shift(yy_state_50)
     T_THIN_ARROW => Shift(yy_state_51)
     T_NORAISE => Shift(yy_state_83)
     T_RAISE => Shift(yy_state_84)
-    NT_func_return_type => Shift(yy_state_1633)
-    T_EQUAL | T_LBRACE => Reduce(0, NT_func_return_type, yy_action_850)
+    NT_func_return_type => Shift(yy_state_1681)
+    T_EQUAL | T_LBRACE => Reduce(0, NT_func_return_type, yy_action_862)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1633(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1681(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(6, NT_fun_header, yy_action_86)
 }
 
 ///|
-fn yy_state_1634(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1682(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_FN => Shift(yy_state_1261)
-    NT_fun_header_generic => Shift(yy_state_1635)
+    T_FN => Shift(yy_state_1309)
+    NT_fun_header_generic => Shift(yy_state_1683)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1635(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1683(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LPAREN => Shift(yy_state_148)
-    NT_parameters => Shift(yy_state_1056)
-    NT_option_parameters_ => Shift(yy_state_1636)
+    NT_parameters => Shift(yy_state_1064)
+    NT_option_parameters_ => Shift(yy_state_1684)
     T_RAISE | T_EQUAL | T_LBRACE | T_THIN_ARROW | T_NORAISE =>
-      Reduce(0, NT_option_parameters_, yy_action_284)
+      Reduce(0, NT_option_parameters_, yy_action_294)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1636(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1684(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_error_annotation => Shift(yy_state_50)
     T_THIN_ARROW => Shift(yy_state_51)
     T_NORAISE => Shift(yy_state_83)
     T_RAISE => Shift(yy_state_84)
-    NT_func_return_type => Shift(yy_state_1637)
-    T_EQUAL | T_LBRACE => Reduce(0, NT_func_return_type, yy_action_850)
+    NT_func_return_type => Shift(yy_state_1685)
+    T_EQUAL | T_LBRACE => Reduce(0, NT_func_return_type, yy_action_862)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1637(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1685(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(7, NT_fun_header, yy_action_85)
 }
 
 ///|
-fn yy_state_1638(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1686(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_FN => Shift(yy_state_1261)
-    T_ENUM => Shift(yy_state_1639)
-    T_STRUCT => Shift(yy_state_1642)
-    T_SUBERROR => Shift(yy_state_1645)
-    T_TYPE => Shift(yy_state_1647)
-    T_USING => Shift(yy_state_1650)
-    T_ENUMVIEW => Shift(yy_state_1655)
-    T_IMPL => Shift(yy_state_1667)
-    T_TRAITALIAS => Shift(yy_state_1684)
-    T_TYPEALIAS => Shift(yy_state_1686)
-    T_TRAIT => Shift(yy_state_1692)
-    T_FNALIAS => Shift(yy_state_1698)
-    T_CONST => Shift(yy_state_1700)
-    T_LET => Shift(yy_state_1704)
-    T_EXTERN => Shift(yy_state_1708)
-    NT_fun_header_generic => Shift(yy_state_1720)
-    T_ASYNC => Shift(yy_state_1723)
+    T_FN => Shift(yy_state_1309)
+    T_ENUM => Shift(yy_state_1687)
+    T_STRUCT => Shift(yy_state_1690)
+    T_SUBERROR => Shift(yy_state_1693)
+    T_TYPE => Shift(yy_state_1695)
+    T_USING => Shift(yy_state_1698)
+    T_ENUMVIEW => Shift(yy_state_1703)
+    T_IMPL => Shift(yy_state_1715)
+    T_TRAITALIAS => Shift(yy_state_1732)
+    T_TYPEALIAS => Shift(yy_state_1734)
+    T_TRAIT => Shift(yy_state_1740)
+    T_FNALIAS => Shift(yy_state_1746)
+    T_CONST => Shift(yy_state_1748)
+    T_LET => Shift(yy_state_1752)
+    T_EXTERN => Shift(yy_state_1756)
+    NT_fun_header_generic => Shift(yy_state_1768)
+    T_ASYNC => Shift(yy_state_1771)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1639(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1687(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1640)
+    T_UIDENT => Shift(yy_state_1688)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1640(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1688(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACKET => Shift(yy_state_849)
+    T_LBRACKET => Shift(yy_state_857)
     NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__ =>
-      Shift(yy_state_860)
-    NT_optional_type_parameters_no_constraints => Shift(yy_state_1641)
+      Shift(yy_state_868)
+    NT_optional_type_parameters_no_constraints => Shift(yy_state_1689)
     T_LBRACE =>
       Reduce(
         0,
         NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__,
-        yy_action_384,
+        yy_action_394,
       )
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1641(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1689(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(5, NT_enum_header, yy_action_84)
 }
 
 ///|
-fn yy_state_1642(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1690(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1643)
+    T_UIDENT => Shift(yy_state_1691)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1643(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1691(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACKET => Shift(yy_state_849)
+    T_LBRACKET => Shift(yy_state_857)
     NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__ =>
-      Shift(yy_state_860)
-    NT_optional_type_parameters_no_constraints => Shift(yy_state_1644)
+      Shift(yy_state_868)
+    NT_optional_type_parameters_no_constraints => Shift(yy_state_1692)
     T_LPAREN | T_LBRACE =>
       Reduce(
         0,
         NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__,
-        yy_action_384,
+        yy_action_394,
       )
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1644(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1692(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(5, NT_struct_header, yy_action_83)
 }
 
 ///|
-fn yy_state_1645(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1693(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1646)
+    T_UIDENT => Shift(yy_state_1694)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1646(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1694(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(4, NT_suberror_header, yy_action_82)
 }
 
 ///|
-fn yy_state_1647(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1695(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1648)
+    T_UIDENT => Shift(yy_state_1696)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1648(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1696(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACKET => Shift(yy_state_849)
+    T_LBRACKET => Shift(yy_state_857)
     NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__ =>
-      Shift(yy_state_860)
-    NT_optional_type_parameters_no_constraints => Shift(yy_state_1649)
+      Shift(yy_state_868)
+    NT_optional_type_parameters_no_constraints => Shift(yy_state_1697)
     T_UIDENT
     | T_EOF
     | T_DERIVE
@@ -50333,122 +51692,122 @@ fn yy_state_1648(_lookahead : YYSymbol) -> YYDecision {
       Reduce(
         0,
         NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__,
-        yy_action_384,
+        yy_action_394,
       )
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1649(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1697(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(5, NT_type_header, yy_action_81)
 }
 
 ///|
-fn yy_state_1650(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1698(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_PACKAGE_NAME => Shift(yy_state_1651)
+    T_PACKAGE_NAME => Shift(yy_state_1699)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1651(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1699(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACE => Shift(yy_state_1652)
+    T_LBRACE => Shift(yy_state_1700)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1652(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1700(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_using_binder => Shift(yy_state_872)
-    NT_non_empty_list_commas_rev_using_binder_ => Shift(yy_state_873)
-    T_TRAIT => Shift(yy_state_877)
-    T_TYPE => Shift(yy_state_881)
-    T_UIDENT => Shift(yy_state_885)
-    T_LIDENT => Shift(yy_state_888)
-    NT_non_empty_list_commas_using_binder_ => Shift(yy_state_891)
-    NT_list_commas_using_binder_ => Shift(yy_state_1653)
-    T_RBRACE => Reduce(0, NT_list_commas_using_binder_, yy_action_370)
+    NT_using_binder => Shift(yy_state_880)
+    NT_non_empty_list_commas_rev_using_binder_ => Shift(yy_state_881)
+    T_TRAIT => Shift(yy_state_885)
+    T_TYPE => Shift(yy_state_889)
+    T_UIDENT => Shift(yy_state_893)
+    T_LIDENT => Shift(yy_state_896)
+    NT_non_empty_list_commas_using_binder_ => Shift(yy_state_899)
+    NT_list_commas_using_binder_ => Shift(yy_state_1701)
+    T_RBRACE => Reduce(0, NT_list_commas_using_binder_, yy_action_380)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1653(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1701(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RBRACE => Shift(yy_state_1654)
+    T_RBRACE => Shift(yy_state_1702)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1654(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1702(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(7, NT_structure_item, yy_action_80)
 }
 
 ///|
-fn yy_state_1655(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1703(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_type_parameters => Shift(yy_state_895)
-    NT_option_type_parameters_ => Shift(yy_state_935)
-    T_LBRACKET => Shift(yy_state_936)
-    NT_optional_type_parameters => Shift(yy_state_1656)
-    T_UIDENT => Reduce(0, NT_option_type_parameters_, yy_action_356)
+    NT_type_parameters => Shift(yy_state_903)
+    NT_option_type_parameters_ => Shift(yy_state_943)
+    T_LBRACKET => Shift(yy_state_944)
+    NT_optional_type_parameters => Shift(yy_state_1704)
+    T_UIDENT => Reduce(0, NT_option_type_parameters_, yy_action_366)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1656(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1704(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1657)
+    T_UIDENT => Shift(yy_state_1705)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1657(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1705(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACE => Shift(yy_state_1658)
+    T_LBRACE => Shift(yy_state_1706)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1658(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1706(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_ATTRIBUTE => Shift(yy_state_845)
-    NT_enum_constructor => Shift(yy_state_899)
-    NT_non_empty_list_attribute_ => Shift(yy_state_903)
-    T_UIDENT => Shift(yy_state_923)
-    NT_non_empty_list_semis_enum_constructor_ => Shift(yy_state_926)
-    NT_list_semis_enum_constructor_ => Shift(yy_state_1659)
-    T_RBRACE => Reduce(0, NT_list_semis_enum_constructor_, yy_action_354)
+    T_ATTRIBUTE => Shift(yy_state_853)
+    NT_enum_constructor => Shift(yy_state_907)
+    NT_non_empty_list_attribute_ => Shift(yy_state_911)
+    T_UIDENT => Shift(yy_state_931)
+    NT_non_empty_list_semis_enum_constructor_ => Shift(yy_state_934)
+    NT_list_semis_enum_constructor_ => Shift(yy_state_1707)
+    T_RBRACE => Reduce(0, NT_list_semis_enum_constructor_, yy_action_364)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1659(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1707(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RBRACE => Shift(yy_state_1660)
+    T_RBRACE => Shift(yy_state_1708)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1660(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1708(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_FOR => Shift(yy_state_1661)
+    T_FOR => Shift(yy_state_1709)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1661(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1709(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -50457,142 +51816,142 @@ fn yy_state_1661(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_type_ => Shift(yy_state_1662)
+    NT_type_ => Shift(yy_state_1710)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1662(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1710(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_WITH => Shift(yy_state_1663)
+    T_WITH => Shift(yy_state_1711)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1663(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1711(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LIDENT => Shift(yy_state_1664)
+    T_LIDENT => Shift(yy_state_1712)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1664(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1712(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LPAREN => Shift(yy_state_148)
-    NT_parameters => Shift(yy_state_1665)
+    NT_parameters => Shift(yy_state_1713)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1665(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1713(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LBRACE => Shift(yy_state_124)
-    NT_block_expr => Shift(yy_state_1666)
+    NT_block_expr => Shift(yy_state_1714)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1666(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1714(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(14, NT_structure_item, yy_action_79)
 }
 
 ///|
-fn yy_state_1667(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1715(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_type_parameters => Shift(yy_state_895)
-    NT_option_type_parameters_ => Shift(yy_state_935)
-    T_LBRACKET => Shift(yy_state_936)
-    NT_optional_type_parameters => Shift(yy_state_1668)
+    NT_type_parameters => Shift(yy_state_903)
+    NT_option_type_parameters_ => Shift(yy_state_943)
+    T_LBRACKET => Shift(yy_state_944)
+    NT_optional_type_parameters => Shift(yy_state_1716)
     T_UIDENT | T_AMPER | T_PACKAGE_NAME =>
-      Reduce(0, NT_option_type_parameters_, yy_action_356)
+      Reduce(0, NT_option_type_parameters_, yy_action_366)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1668(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1716(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_AMPER => Shift(yy_state_18)
     T_PACKAGE_NAME => Shift(yy_state_20)
     T_UIDENT => Shift(yy_state_23)
     NT_qual_ident_ty => Shift(yy_state_24)
-    NT_type_name => Shift(yy_state_1669)
+    NT_type_name => Shift(yy_state_1717)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1669(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1717(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_WITH => Shift(yy_state_1670)
-    T_FOR => Shift(yy_state_1676)
+    T_WITH => Shift(yy_state_1718)
+    T_FOR => Shift(yy_state_1724)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1670(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1718(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LIDENT => Shift(yy_state_1671)
+    T_LIDENT => Shift(yy_state_1719)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1671(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1719(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_EXCLAMATION => Shift(yy_state_726)
-    NT_optional_bang => Shift(yy_state_1672)
-    T_LPAREN => Reduce(0, NT_optional_bang, yy_action_851)
+    T_EXCLAMATION => Shift(yy_state_734)
+    NT_optional_bang => Shift(yy_state_1720)
+    T_LPAREN => Reduce(0, NT_optional_bang, yy_action_863)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1672(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1720(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LPAREN => Shift(yy_state_148)
-    NT_parameters => Shift(yy_state_1673)
+    NT_parameters => Shift(yy_state_1721)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1673(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1721(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_error_annotation => Shift(yy_state_50)
     T_THIN_ARROW => Shift(yy_state_51)
     T_NORAISE => Shift(yy_state_83)
     T_RAISE => Shift(yy_state_84)
-    NT_func_return_type => Shift(yy_state_1674)
-    T_EQUAL | T_LBRACE => Reduce(0, NT_func_return_type, yy_action_850)
+    NT_func_return_type => Shift(yy_state_1722)
+    T_EQUAL | T_LBRACE => Reduce(0, NT_func_return_type, yy_action_862)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1674(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1722(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_EQUAL => Shift(yy_state_960)
-    NT_block_expr_with_local_types => Shift(yy_state_962)
-    T_LBRACE => Shift(yy_state_963)
-    NT_impl_body => Shift(yy_state_1675)
+    T_EQUAL => Shift(yy_state_968)
+    NT_block_expr_with_local_types => Shift(yy_state_970)
+    T_LBRACE => Shift(yy_state_971)
+    NT_impl_body => Shift(yy_state_1723)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1675(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1723(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(11, NT_structure_item, yy_action_78)
 }
 
 ///|
-fn yy_state_1676(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1724(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -50601,252 +51960,252 @@ fn yy_state_1676(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_type_ => Shift(yy_state_1677)
+    NT_type_ => Shift(yy_state_1725)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1677(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1725(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_WITH => Shift(yy_state_1678)
+    T_WITH => Shift(yy_state_1726)
     T_EOF | T_SEMI => Reduce(7, NT_structure_item, yy_action_77)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1678(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1726(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LIDENT => Shift(yy_state_1679)
+    T_LIDENT => Shift(yy_state_1727)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1679(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1727(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_EXCLAMATION => Shift(yy_state_726)
-    NT_optional_bang => Shift(yy_state_1680)
-    T_LPAREN => Reduce(0, NT_optional_bang, yy_action_851)
+    T_EXCLAMATION => Shift(yy_state_734)
+    NT_optional_bang => Shift(yy_state_1728)
+    T_LPAREN => Reduce(0, NT_optional_bang, yy_action_863)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1680(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1728(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LPAREN => Shift(yy_state_148)
-    NT_parameters => Shift(yy_state_1681)
+    NT_parameters => Shift(yy_state_1729)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1681(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1729(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_error_annotation => Shift(yy_state_50)
     T_THIN_ARROW => Shift(yy_state_51)
     T_NORAISE => Shift(yy_state_83)
     T_RAISE => Shift(yy_state_84)
-    NT_func_return_type => Shift(yy_state_1682)
-    T_EQUAL | T_LBRACE => Reduce(0, NT_func_return_type, yy_action_850)
+    NT_func_return_type => Shift(yy_state_1730)
+    T_EQUAL | T_LBRACE => Reduce(0, NT_func_return_type, yy_action_862)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1682(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1730(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_EQUAL => Shift(yy_state_960)
-    NT_block_expr_with_local_types => Shift(yy_state_962)
-    T_LBRACE => Shift(yy_state_963)
-    NT_impl_body => Shift(yy_state_1683)
+    T_EQUAL => Shift(yy_state_968)
+    NT_block_expr_with_local_types => Shift(yy_state_970)
+    T_LBRACE => Shift(yy_state_971)
+    NT_impl_body => Shift(yy_state_1731)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1683(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1731(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(13, NT_structure_item, yy_action_76)
 }
 
 ///|
-fn yy_state_1684(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1732(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1060)
-    NT_batch_type_alias_target_UIDENT_ => Shift(yy_state_1063)
-    T_PACKAGE_NAME => Shift(yy_state_1064)
-    NT_batch_type_alias_targets => Shift(yy_state_1685)
+    T_UIDENT => Shift(yy_state_1068)
+    NT_batch_type_alias_target_UIDENT_ => Shift(yy_state_1071)
+    T_PACKAGE_NAME => Shift(yy_state_1072)
+    NT_batch_type_alias_targets => Shift(yy_state_1733)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1685(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1733(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(4, NT_structure_item, yy_action_75)
 }
 
 ///|
-fn yy_state_1686(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1734(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
     T_AMPER => Shift(yy_state_58)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_batch_type_alias_target_UIDENT_ => Shift(yy_state_1063)
-    T_UIDENT => Shift(yy_state_1079)
-    T_PACKAGE_NAME => Shift(yy_state_1080)
-    NT_type_ => Shift(yy_state_1687)
-    NT_batch_type_alias_targets => Shift(yy_state_1691)
+    NT_batch_type_alias_target_UIDENT_ => Shift(yy_state_1071)
+    T_UIDENT => Shift(yy_state_1087)
+    T_PACKAGE_NAME => Shift(yy_state_1088)
+    NT_type_ => Shift(yy_state_1735)
+    NT_batch_type_alias_targets => Shift(yy_state_1739)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1687(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1735(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_AS => Shift(yy_state_1688)
+    T_AS => Shift(yy_state_1736)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1688(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1736(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1689)
+    T_UIDENT => Shift(yy_state_1737)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1689(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1737(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACKET => Shift(yy_state_849)
+    T_LBRACKET => Shift(yy_state_857)
     NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__ =>
-      Shift(yy_state_860)
-    NT_optional_type_parameters_no_constraints => Shift(yy_state_1690)
+      Shift(yy_state_868)
+    NT_optional_type_parameters_no_constraints => Shift(yy_state_1738)
     T_EOF | T_SEMI =>
       Reduce(
         0,
         NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__,
-        yy_action_384,
+        yy_action_394,
       )
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1690(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1738(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(7, NT_structure_item, yy_action_74)
 }
 
 ///|
-fn yy_state_1691(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1739(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(4, NT_structure_item, yy_action_73)
 }
 
 ///|
-fn yy_state_1692(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1740(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1693)
+    T_UIDENT => Shift(yy_state_1741)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1693(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1741(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_1089)
+    T_COLON => Shift(yy_state_1097)
     NT_option_preceded_COLON_separated_nonempty_list_PLUS_tvar_constraint___ =>
-      Shift(yy_state_1694)
+      Shift(yy_state_1742)
     T_LBRACE =>
       Reduce(
         0,
         NT_option_preceded_COLON_separated_nonempty_list_PLUS_tvar_constraint___,
-        yy_action_268,
+        yy_action_278,
       )
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1694(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1742(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACE => Shift(yy_state_1695)
+    T_LBRACE => Shift(yy_state_1743)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1695(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1743(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_ATTRIBUTE => Shift(yy_state_845)
-    NT_trait_method_decl => Shift(yy_state_1093)
-    NT_non_empty_list_attribute_ => Shift(yy_state_1097)
-    T_LIDENT => Shift(yy_state_1134)
-    T_ASYNC => Shift(yy_state_1142)
-    NT_non_empty_list_semis_trait_method_decl_ => Shift(yy_state_1151)
-    NT_list_semis_trait_method_decl_ => Shift(yy_state_1696)
-    T_RBRACE => Reduce(0, NT_list_semis_trait_method_decl_, yy_action_265)
+    T_ATTRIBUTE => Shift(yy_state_853)
+    NT_trait_method_decl => Shift(yy_state_1101)
+    NT_non_empty_list_attribute_ => Shift(yy_state_1105)
+    T_LIDENT => Shift(yy_state_1142)
+    T_ASYNC => Shift(yy_state_1150)
+    NT_non_empty_list_semis_trait_method_decl_ => Shift(yy_state_1159)
+    NT_list_semis_trait_method_decl_ => Shift(yy_state_1744)
+    T_RBRACE => Reduce(0, NT_list_semis_trait_method_decl_, yy_action_275)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1696(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1744(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RBRACE => Shift(yy_state_1697)
+    T_RBRACE => Shift(yy_state_1745)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1697(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1745(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(8, NT_structure_item, yy_action_72)
 }
 
 ///|
-fn yy_state_1698(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1746(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1155)
-    T_LIDENT => Shift(yy_state_1157)
-    NT_option_func_alias_type_name_LIDENT_UIDENT__ => Shift(yy_state_1162)
-    T_PACKAGE_NAME => Shift(yy_state_1172)
-    NT_func_alias_type_name_LIDENT_UIDENT_ => Shift(yy_state_1187)
-    NT_func_alias_target_LIDENT_ => Shift(yy_state_1189)
-    NT_func_alias_targets => Shift(yy_state_1699)
+    T_UIDENT => Shift(yy_state_1163)
+    T_LIDENT => Shift(yy_state_1165)
+    NT_option_func_alias_type_name_LIDENT_UIDENT__ => Shift(yy_state_1170)
+    T_PACKAGE_NAME => Shift(yy_state_1180)
+    NT_func_alias_type_name_LIDENT_UIDENT_ => Shift(yy_state_1195)
+    NT_func_alias_target_LIDENT_ => Shift(yy_state_1197)
+    NT_func_alias_targets => Shift(yy_state_1747)
     T_LPAREN =>
-      Reduce(0, NT_option_func_alias_type_name_LIDENT_UIDENT__, yy_action_243)
+      Reduce(0, NT_option_func_alias_type_name_LIDENT_UIDENT__, yy_action_253)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1699(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1747(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(4, NT_structure_item, yy_action_71)
 }
 
 ///|
-fn yy_state_1700(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1748(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1701)
+    T_UIDENT => Shift(yy_state_1749)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1701(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1749(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_1702)
+    T_COLON => Shift(yy_state_1750)
     T_EQUAL => Reduce(4, NT_val_header, yy_action_70)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1702(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1750(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -50855,35 +52214,35 @@ fn yy_state_1702(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_type_ => Shift(yy_state_1703)
+    NT_type_ => Shift(yy_state_1751)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1703(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1751(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(6, NT_val_header, yy_action_69)
 }
 
 ///|
-fn yy_state_1704(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1752(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LIDENT => Shift(yy_state_1705)
+    T_LIDENT => Shift(yy_state_1753)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1705(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1753(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_1706)
+    T_COLON => Shift(yy_state_1754)
     T_EQUAL => Reduce(4, NT_val_header, yy_action_68)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1706(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1754(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -50892,320 +52251,320 @@ fn yy_state_1706(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_type_ => Shift(yy_state_1707)
+    NT_type_ => Shift(yy_state_1755)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1707(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1755(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(6, NT_val_header, yy_action_67)
 }
 
 ///|
-fn yy_state_1708(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1756(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_TYPE => Shift(yy_state_1709)
-    T_STRING => Shift(yy_state_1713)
+    T_TYPE => Shift(yy_state_1757)
+    T_STRING => Shift(yy_state_1761)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1709(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1757(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1710)
+    T_UIDENT => Shift(yy_state_1758)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1710(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1758(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACKET => Shift(yy_state_849)
+    T_LBRACKET => Shift(yy_state_857)
     NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__ =>
-      Shift(yy_state_860)
-    NT_optional_type_parameters_no_constraints => Shift(yy_state_1711)
+      Shift(yy_state_868)
+    NT_optional_type_parameters_no_constraints => Shift(yy_state_1759)
     T_EOF | T_DERIVE | T_SEMI =>
       Reduce(
         0,
         NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__,
-        yy_action_384,
+        yy_action_394,
       )
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1711(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1759(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_DERIVE => Shift(yy_state_973)
-    NT_deriving_directive_list => Shift(yy_state_1712)
-    T_EOF | T_SEMI => Reduce(0, NT_deriving_directive_list, yy_action_315)
+    T_DERIVE => Shift(yy_state_981)
+    NT_deriving_directive_list => Shift(yy_state_1760)
+    T_EOF | T_SEMI => Reduce(0, NT_deriving_directive_list, yy_action_325)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1712(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1760(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(7, NT_structure_item, yy_action_66)
 }
 
 ///|
-fn yy_state_1713(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1761(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_FN => Shift(yy_state_1714)
+    T_FN => Shift(yy_state_1762)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1714(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1762(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_AMPER => Shift(yy_state_18)
     T_PACKAGE_NAME => Shift(yy_state_20)
     T_UIDENT => Shift(yy_state_23)
     NT_qual_ident_ty => Shift(yy_state_24)
-    T_LIDENT => Shift(yy_state_1257)
-    NT_type_name => Shift(yy_state_1258)
-    NT_fun_binder => Shift(yy_state_1715)
+    T_LIDENT => Shift(yy_state_1305)
+    NT_type_name => Shift(yy_state_1306)
+    NT_fun_binder => Shift(yy_state_1763)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1715(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1763(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_EXCLAMATION => Shift(yy_state_726)
-    NT_optional_bang => Shift(yy_state_1716)
+    T_EXCLAMATION => Shift(yy_state_734)
+    NT_optional_bang => Shift(yy_state_1764)
     T_RAISE | T_EQUAL | T_LPAREN | T_LBRACKET | T_THIN_ARROW | T_NORAISE =>
-      Reduce(0, NT_optional_bang, yy_action_851)
+      Reduce(0, NT_optional_bang, yy_action_863)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1716(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1764(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_type_parameters => Shift(yy_state_895)
-    NT_option_type_parameters_ => Shift(yy_state_935)
-    T_LBRACKET => Shift(yy_state_936)
-    NT_optional_type_parameters => Shift(yy_state_1717)
+    NT_type_parameters => Shift(yy_state_903)
+    NT_option_type_parameters_ => Shift(yy_state_943)
+    T_LBRACKET => Shift(yy_state_944)
+    NT_optional_type_parameters => Shift(yy_state_1765)
     T_RAISE | T_EQUAL | T_LPAREN | T_THIN_ARROW | T_NORAISE =>
-      Reduce(0, NT_option_type_parameters_, yy_action_356)
+      Reduce(0, NT_option_type_parameters_, yy_action_366)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1717(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1765(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LPAREN => Shift(yy_state_148)
-    NT_parameters => Shift(yy_state_1056)
-    NT_option_parameters_ => Shift(yy_state_1718)
+    NT_parameters => Shift(yy_state_1064)
+    NT_option_parameters_ => Shift(yy_state_1766)
     T_RAISE | T_EQUAL | T_THIN_ARROW | T_NORAISE =>
-      Reduce(0, NT_option_parameters_, yy_action_284)
+      Reduce(0, NT_option_parameters_, yy_action_294)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1718(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1766(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_error_annotation => Shift(yy_state_50)
     T_THIN_ARROW => Shift(yy_state_51)
     T_NORAISE => Shift(yy_state_83)
     T_RAISE => Shift(yy_state_84)
-    NT_func_return_type => Shift(yy_state_1719)
-    T_EQUAL => Reduce(0, NT_func_return_type, yy_action_850)
+    NT_func_return_type => Shift(yy_state_1767)
+    T_EQUAL => Reduce(0, NT_func_return_type, yy_action_862)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1719(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1767(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(10, NT_extern_fun_header, yy_action_65)
 }
 
 ///|
-fn yy_state_1720(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1768(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LPAREN => Shift(yy_state_148)
-    NT_parameters => Shift(yy_state_1056)
-    NT_option_parameters_ => Shift(yy_state_1721)
+    NT_parameters => Shift(yy_state_1064)
+    NT_option_parameters_ => Shift(yy_state_1769)
     T_RAISE | T_EQUAL | T_LBRACE | T_THIN_ARROW | T_NORAISE =>
-      Reduce(0, NT_option_parameters_, yy_action_284)
+      Reduce(0, NT_option_parameters_, yy_action_294)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1721(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1769(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_error_annotation => Shift(yy_state_50)
     T_THIN_ARROW => Shift(yy_state_51)
     T_NORAISE => Shift(yy_state_83)
     T_RAISE => Shift(yy_state_84)
-    NT_func_return_type => Shift(yy_state_1722)
-    T_EQUAL | T_LBRACE => Reduce(0, NT_func_return_type, yy_action_850)
+    NT_func_return_type => Shift(yy_state_1770)
+    T_EQUAL | T_LBRACE => Reduce(0, NT_func_return_type, yy_action_862)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1722(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1770(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(5, NT_fun_header, yy_action_64)
 }
 
 ///|
-fn yy_state_1723(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1771(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_FN => Shift(yy_state_1261)
-    NT_fun_header_generic => Shift(yy_state_1724)
+    T_FN => Shift(yy_state_1309)
+    NT_fun_header_generic => Shift(yy_state_1772)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1724(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1772(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LPAREN => Shift(yy_state_148)
-    NT_parameters => Shift(yy_state_1056)
-    NT_option_parameters_ => Shift(yy_state_1725)
+    NT_parameters => Shift(yy_state_1064)
+    NT_option_parameters_ => Shift(yy_state_1773)
     T_RAISE | T_EQUAL | T_LBRACE | T_THIN_ARROW | T_NORAISE =>
-      Reduce(0, NT_option_parameters_, yy_action_284)
+      Reduce(0, NT_option_parameters_, yy_action_294)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1725(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1773(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_error_annotation => Shift(yy_state_50)
     T_THIN_ARROW => Shift(yy_state_51)
     T_NORAISE => Shift(yy_state_83)
     T_RAISE => Shift(yy_state_84)
-    NT_func_return_type => Shift(yy_state_1726)
-    T_EQUAL | T_LBRACE => Reduce(0, NT_func_return_type, yy_action_850)
+    NT_func_return_type => Shift(yy_state_1774)
+    T_EQUAL | T_LBRACE => Reduce(0, NT_func_return_type, yy_action_862)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1726(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1774(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(6, NT_fun_header, yy_action_63)
 }
 
 ///|
-fn yy_state_1727(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1775(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LPAREN => Shift(yy_state_148)
-    NT_parameters => Shift(yy_state_1056)
-    NT_option_parameters_ => Shift(yy_state_1728)
+    NT_parameters => Shift(yy_state_1064)
+    NT_option_parameters_ => Shift(yy_state_1776)
     T_RAISE | T_EQUAL | T_LBRACE | T_THIN_ARROW | T_NORAISE =>
-      Reduce(0, NT_option_parameters_, yy_action_284)
+      Reduce(0, NT_option_parameters_, yy_action_294)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1728(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1776(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_error_annotation => Shift(yy_state_50)
     T_THIN_ARROW => Shift(yy_state_51)
     T_NORAISE => Shift(yy_state_83)
     T_RAISE => Shift(yy_state_84)
-    NT_func_return_type => Shift(yy_state_1729)
-    T_EQUAL | T_LBRACE => Reduce(0, NT_func_return_type, yy_action_850)
+    NT_func_return_type => Shift(yy_state_1777)
+    T_EQUAL | T_LBRACE => Reduce(0, NT_func_return_type, yy_action_862)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1729(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1777(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(4, NT_fun_header, yy_action_62)
 }
 
 ///|
-fn yy_state_1730(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1778(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_FN => Shift(yy_state_1261)
-    T_TEST => Shift(yy_state_1731)
-    NT_fun_header_generic => Shift(yy_state_1735)
+    T_FN => Shift(yy_state_1309)
+    T_TEST => Shift(yy_state_1779)
+    NT_fun_header_generic => Shift(yy_state_1783)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1731(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1779(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_STRING => Shift(yy_state_1054)
-    NT_option_loced_string_ => Shift(yy_state_1732)
-    T_LPAREN | T_LBRACE => Reduce(0, NT_option_loced_string_, yy_action_287)
+    T_STRING => Shift(yy_state_1062)
+    NT_option_loced_string_ => Shift(yy_state_1780)
+    T_LPAREN | T_LBRACE => Reduce(0, NT_option_loced_string_, yy_action_297)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1732(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1780(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LPAREN => Shift(yy_state_148)
-    NT_parameters => Shift(yy_state_1056)
-    NT_option_parameters_ => Shift(yy_state_1733)
-    T_LBRACE => Reduce(0, NT_option_parameters_, yy_action_284)
+    NT_parameters => Shift(yy_state_1064)
+    NT_option_parameters_ => Shift(yy_state_1781)
+    T_LBRACE => Reduce(0, NT_option_parameters_, yy_action_294)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1733(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1781(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACE => Shift(yy_state_963)
-    NT_block_expr_with_local_types => Shift(yy_state_1734)
+    T_LBRACE => Shift(yy_state_971)
+    NT_block_expr_with_local_types => Shift(yy_state_1782)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1734(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1782(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(6, NT_structure_item, yy_action_61)
 }
 
 ///|
-fn yy_state_1735(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1783(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LPAREN => Shift(yy_state_148)
-    NT_parameters => Shift(yy_state_1056)
-    NT_option_parameters_ => Shift(yy_state_1736)
+    NT_parameters => Shift(yy_state_1064)
+    NT_option_parameters_ => Shift(yy_state_1784)
     T_RAISE | T_EQUAL | T_LBRACE | T_THIN_ARROW | T_NORAISE =>
-      Reduce(0, NT_option_parameters_, yy_action_284)
+      Reduce(0, NT_option_parameters_, yy_action_294)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1736(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1784(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_error_annotation => Shift(yy_state_50)
     T_THIN_ARROW => Shift(yy_state_51)
     T_NORAISE => Shift(yy_state_83)
     T_RAISE => Shift(yy_state_84)
-    NT_func_return_type => Shift(yy_state_1737)
-    T_EQUAL | T_LBRACE => Reduce(0, NT_func_return_type, yy_action_850)
+    NT_func_return_type => Shift(yy_state_1785)
+    T_EQUAL | T_LBRACE => Reduce(0, NT_func_return_type, yy_action_862)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1737(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1785(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(5, NT_fun_header, yy_action_59)
 }
 
 ///|
-fn yy_state_1738(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1786(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LPAREN => Shift(yy_state_1012)
-    NT_pub_attr => Shift(yy_state_1739)
+    T_LPAREN => Shift(yy_state_1020)
+    NT_pub_attr => Shift(yy_state_1787)
     T_EXTERN
     | T_STRUCT
     | T_ENUM
@@ -51221,123 +52580,123 @@ fn yy_state_1738(_lookahead : YYSymbol) -> YYDecision {
     | T_USING
     | T_TYPE
     | T_SUBERROR
-    | T_ENUMVIEW => Reduce(0, NT_pub_attr, yy_action_300)
+    | T_ENUMVIEW => Reduce(0, NT_pub_attr, yy_action_310)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1739(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1787(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_FN => Shift(yy_state_1261)
-    T_ENUM => Shift(yy_state_1740)
-    T_STRUCT => Shift(yy_state_1743)
-    T_SUBERROR => Shift(yy_state_1746)
-    T_TYPE => Shift(yy_state_1748)
-    T_USING => Shift(yy_state_1751)
-    T_ENUMVIEW => Shift(yy_state_1756)
-    T_IMPL => Shift(yy_state_1768)
-    T_TRAITALIAS => Shift(yy_state_1785)
-    T_TYPEALIAS => Shift(yy_state_1787)
-    T_TRAIT => Shift(yy_state_1793)
-    T_FNALIAS => Shift(yy_state_1799)
-    T_CONST => Shift(yy_state_1801)
-    T_LET => Shift(yy_state_1805)
-    T_EXTERN => Shift(yy_state_1809)
-    NT_fun_header_generic => Shift(yy_state_1821)
-    T_ASYNC => Shift(yy_state_1824)
+    T_FN => Shift(yy_state_1309)
+    T_ENUM => Shift(yy_state_1788)
+    T_STRUCT => Shift(yy_state_1791)
+    T_SUBERROR => Shift(yy_state_1794)
+    T_TYPE => Shift(yy_state_1796)
+    T_USING => Shift(yy_state_1799)
+    T_ENUMVIEW => Shift(yy_state_1804)
+    T_IMPL => Shift(yy_state_1816)
+    T_TRAITALIAS => Shift(yy_state_1833)
+    T_TYPEALIAS => Shift(yy_state_1835)
+    T_TRAIT => Shift(yy_state_1841)
+    T_FNALIAS => Shift(yy_state_1847)
+    T_CONST => Shift(yy_state_1849)
+    T_LET => Shift(yy_state_1853)
+    T_EXTERN => Shift(yy_state_1857)
+    NT_fun_header_generic => Shift(yy_state_1869)
+    T_ASYNC => Shift(yy_state_1872)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1740(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1788(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1741)
+    T_UIDENT => Shift(yy_state_1789)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1741(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1789(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACKET => Shift(yy_state_849)
+    T_LBRACKET => Shift(yy_state_857)
     NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__ =>
-      Shift(yy_state_860)
-    NT_optional_type_parameters_no_constraints => Shift(yy_state_1742)
+      Shift(yy_state_868)
+    NT_optional_type_parameters_no_constraints => Shift(yy_state_1790)
     T_LBRACE =>
       Reduce(
         0,
         NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__,
-        yy_action_384,
+        yy_action_394,
       )
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1742(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1790(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(5, NT_enum_header, yy_action_58)
 }
 
 ///|
-fn yy_state_1743(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1791(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1744)
+    T_UIDENT => Shift(yy_state_1792)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1744(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1792(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACKET => Shift(yy_state_849)
+    T_LBRACKET => Shift(yy_state_857)
     NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__ =>
-      Shift(yy_state_860)
-    NT_optional_type_parameters_no_constraints => Shift(yy_state_1745)
+      Shift(yy_state_868)
+    NT_optional_type_parameters_no_constraints => Shift(yy_state_1793)
     T_LPAREN | T_LBRACE =>
       Reduce(
         0,
         NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__,
-        yy_action_384,
+        yy_action_394,
       )
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1745(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1793(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(5, NT_struct_header, yy_action_57)
 }
 
 ///|
-fn yy_state_1746(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1794(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1747)
+    T_UIDENT => Shift(yy_state_1795)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1747(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1795(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(4, NT_suberror_header, yy_action_56)
 }
 
 ///|
-fn yy_state_1748(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1796(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1749)
+    T_UIDENT => Shift(yy_state_1797)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1749(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1797(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACKET => Shift(yy_state_849)
+    T_LBRACKET => Shift(yy_state_857)
     NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__ =>
-      Shift(yy_state_860)
-    NT_optional_type_parameters_no_constraints => Shift(yy_state_1750)
+      Shift(yy_state_868)
+    NT_optional_type_parameters_no_constraints => Shift(yy_state_1798)
     T_UIDENT
     | T_EOF
     | T_DERIVE
@@ -51351,122 +52710,122 @@ fn yy_state_1749(_lookahead : YYSymbol) -> YYDecision {
       Reduce(
         0,
         NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__,
-        yy_action_384,
+        yy_action_394,
       )
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1750(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1798(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(5, NT_type_header, yy_action_55)
 }
 
 ///|
-fn yy_state_1751(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1799(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_PACKAGE_NAME => Shift(yy_state_1752)
+    T_PACKAGE_NAME => Shift(yy_state_1800)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1752(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1800(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACE => Shift(yy_state_1753)
+    T_LBRACE => Shift(yy_state_1801)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1753(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1801(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_using_binder => Shift(yy_state_872)
-    NT_non_empty_list_commas_rev_using_binder_ => Shift(yy_state_873)
-    T_TRAIT => Shift(yy_state_877)
-    T_TYPE => Shift(yy_state_881)
-    T_UIDENT => Shift(yy_state_885)
-    T_LIDENT => Shift(yy_state_888)
-    NT_non_empty_list_commas_using_binder_ => Shift(yy_state_891)
-    NT_list_commas_using_binder_ => Shift(yy_state_1754)
-    T_RBRACE => Reduce(0, NT_list_commas_using_binder_, yy_action_370)
+    NT_using_binder => Shift(yy_state_880)
+    NT_non_empty_list_commas_rev_using_binder_ => Shift(yy_state_881)
+    T_TRAIT => Shift(yy_state_885)
+    T_TYPE => Shift(yy_state_889)
+    T_UIDENT => Shift(yy_state_893)
+    T_LIDENT => Shift(yy_state_896)
+    NT_non_empty_list_commas_using_binder_ => Shift(yy_state_899)
+    NT_list_commas_using_binder_ => Shift(yy_state_1802)
+    T_RBRACE => Reduce(0, NT_list_commas_using_binder_, yy_action_380)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1754(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1802(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RBRACE => Shift(yy_state_1755)
+    T_RBRACE => Shift(yy_state_1803)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1755(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1803(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(7, NT_structure_item, yy_action_54)
 }
 
 ///|
-fn yy_state_1756(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1804(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_type_parameters => Shift(yy_state_895)
-    NT_option_type_parameters_ => Shift(yy_state_935)
-    T_LBRACKET => Shift(yy_state_936)
-    NT_optional_type_parameters => Shift(yy_state_1757)
-    T_UIDENT => Reduce(0, NT_option_type_parameters_, yy_action_356)
+    NT_type_parameters => Shift(yy_state_903)
+    NT_option_type_parameters_ => Shift(yy_state_943)
+    T_LBRACKET => Shift(yy_state_944)
+    NT_optional_type_parameters => Shift(yy_state_1805)
+    T_UIDENT => Reduce(0, NT_option_type_parameters_, yy_action_366)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1757(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1805(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1758)
+    T_UIDENT => Shift(yy_state_1806)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1758(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1806(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACE => Shift(yy_state_1759)
+    T_LBRACE => Shift(yy_state_1807)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1759(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1807(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_ATTRIBUTE => Shift(yy_state_845)
-    NT_enum_constructor => Shift(yy_state_899)
-    NT_non_empty_list_attribute_ => Shift(yy_state_903)
-    T_UIDENT => Shift(yy_state_923)
-    NT_non_empty_list_semis_enum_constructor_ => Shift(yy_state_926)
-    NT_list_semis_enum_constructor_ => Shift(yy_state_1760)
-    T_RBRACE => Reduce(0, NT_list_semis_enum_constructor_, yy_action_354)
+    T_ATTRIBUTE => Shift(yy_state_853)
+    NT_enum_constructor => Shift(yy_state_907)
+    NT_non_empty_list_attribute_ => Shift(yy_state_911)
+    T_UIDENT => Shift(yy_state_931)
+    NT_non_empty_list_semis_enum_constructor_ => Shift(yy_state_934)
+    NT_list_semis_enum_constructor_ => Shift(yy_state_1808)
+    T_RBRACE => Reduce(0, NT_list_semis_enum_constructor_, yy_action_364)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1760(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1808(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RBRACE => Shift(yy_state_1761)
+    T_RBRACE => Shift(yy_state_1809)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1761(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1809(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_FOR => Shift(yy_state_1762)
+    T_FOR => Shift(yy_state_1810)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1762(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1810(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -51475,142 +52834,142 @@ fn yy_state_1762(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_type_ => Shift(yy_state_1763)
+    NT_type_ => Shift(yy_state_1811)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1763(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1811(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_WITH => Shift(yy_state_1764)
+    T_WITH => Shift(yy_state_1812)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1764(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1812(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LIDENT => Shift(yy_state_1765)
+    T_LIDENT => Shift(yy_state_1813)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1765(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1813(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LPAREN => Shift(yy_state_148)
-    NT_parameters => Shift(yy_state_1766)
+    NT_parameters => Shift(yy_state_1814)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1766(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1814(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LBRACE => Shift(yy_state_124)
-    NT_block_expr => Shift(yy_state_1767)
+    NT_block_expr => Shift(yy_state_1815)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1767(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1815(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(14, NT_structure_item, yy_action_53)
 }
 
 ///|
-fn yy_state_1768(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1816(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_type_parameters => Shift(yy_state_895)
-    NT_option_type_parameters_ => Shift(yy_state_935)
-    T_LBRACKET => Shift(yy_state_936)
-    NT_optional_type_parameters => Shift(yy_state_1769)
+    NT_type_parameters => Shift(yy_state_903)
+    NT_option_type_parameters_ => Shift(yy_state_943)
+    T_LBRACKET => Shift(yy_state_944)
+    NT_optional_type_parameters => Shift(yy_state_1817)
     T_UIDENT | T_AMPER | T_PACKAGE_NAME =>
-      Reduce(0, NT_option_type_parameters_, yy_action_356)
+      Reduce(0, NT_option_type_parameters_, yy_action_366)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1769(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1817(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_AMPER => Shift(yy_state_18)
     T_PACKAGE_NAME => Shift(yy_state_20)
     T_UIDENT => Shift(yy_state_23)
     NT_qual_ident_ty => Shift(yy_state_24)
-    NT_type_name => Shift(yy_state_1770)
+    NT_type_name => Shift(yy_state_1818)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1770(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1818(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_WITH => Shift(yy_state_1771)
-    T_FOR => Shift(yy_state_1777)
+    T_WITH => Shift(yy_state_1819)
+    T_FOR => Shift(yy_state_1825)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1771(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1819(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LIDENT => Shift(yy_state_1772)
+    T_LIDENT => Shift(yy_state_1820)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1772(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1820(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_EXCLAMATION => Shift(yy_state_726)
-    NT_optional_bang => Shift(yy_state_1773)
-    T_LPAREN => Reduce(0, NT_optional_bang, yy_action_851)
+    T_EXCLAMATION => Shift(yy_state_734)
+    NT_optional_bang => Shift(yy_state_1821)
+    T_LPAREN => Reduce(0, NT_optional_bang, yy_action_863)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1773(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1821(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LPAREN => Shift(yy_state_148)
-    NT_parameters => Shift(yy_state_1774)
+    NT_parameters => Shift(yy_state_1822)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1774(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1822(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_error_annotation => Shift(yy_state_50)
     T_THIN_ARROW => Shift(yy_state_51)
     T_NORAISE => Shift(yy_state_83)
     T_RAISE => Shift(yy_state_84)
-    NT_func_return_type => Shift(yy_state_1775)
-    T_EQUAL | T_LBRACE => Reduce(0, NT_func_return_type, yy_action_850)
+    NT_func_return_type => Shift(yy_state_1823)
+    T_EQUAL | T_LBRACE => Reduce(0, NT_func_return_type, yy_action_862)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1775(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1823(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_EQUAL => Shift(yy_state_960)
-    NT_block_expr_with_local_types => Shift(yy_state_962)
-    T_LBRACE => Shift(yy_state_963)
-    NT_impl_body => Shift(yy_state_1776)
+    T_EQUAL => Shift(yy_state_968)
+    NT_block_expr_with_local_types => Shift(yy_state_970)
+    T_LBRACE => Shift(yy_state_971)
+    NT_impl_body => Shift(yy_state_1824)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1776(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1824(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(11, NT_structure_item, yy_action_52)
 }
 
 ///|
-fn yy_state_1777(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1825(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -51619,252 +52978,252 @@ fn yy_state_1777(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_type_ => Shift(yy_state_1778)
+    NT_type_ => Shift(yy_state_1826)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1778(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1826(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_WITH => Shift(yy_state_1779)
+    T_WITH => Shift(yy_state_1827)
     T_EOF | T_SEMI => Reduce(7, NT_structure_item, yy_action_51)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1779(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1827(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LIDENT => Shift(yy_state_1780)
+    T_LIDENT => Shift(yy_state_1828)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1780(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1828(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_EXCLAMATION => Shift(yy_state_726)
-    NT_optional_bang => Shift(yy_state_1781)
-    T_LPAREN => Reduce(0, NT_optional_bang, yy_action_851)
+    T_EXCLAMATION => Shift(yy_state_734)
+    NT_optional_bang => Shift(yy_state_1829)
+    T_LPAREN => Reduce(0, NT_optional_bang, yy_action_863)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1781(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1829(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LPAREN => Shift(yy_state_148)
-    NT_parameters => Shift(yy_state_1782)
+    NT_parameters => Shift(yy_state_1830)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1782(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1830(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_error_annotation => Shift(yy_state_50)
     T_THIN_ARROW => Shift(yy_state_51)
     T_NORAISE => Shift(yy_state_83)
     T_RAISE => Shift(yy_state_84)
-    NT_func_return_type => Shift(yy_state_1783)
-    T_EQUAL | T_LBRACE => Reduce(0, NT_func_return_type, yy_action_850)
+    NT_func_return_type => Shift(yy_state_1831)
+    T_EQUAL | T_LBRACE => Reduce(0, NT_func_return_type, yy_action_862)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1783(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1831(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_EQUAL => Shift(yy_state_960)
-    NT_block_expr_with_local_types => Shift(yy_state_962)
-    T_LBRACE => Shift(yy_state_963)
-    NT_impl_body => Shift(yy_state_1784)
+    T_EQUAL => Shift(yy_state_968)
+    NT_block_expr_with_local_types => Shift(yy_state_970)
+    T_LBRACE => Shift(yy_state_971)
+    NT_impl_body => Shift(yy_state_1832)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1784(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1832(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(13, NT_structure_item, yy_action_50)
 }
 
 ///|
-fn yy_state_1785(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1833(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1060)
-    NT_batch_type_alias_target_UIDENT_ => Shift(yy_state_1063)
-    T_PACKAGE_NAME => Shift(yy_state_1064)
-    NT_batch_type_alias_targets => Shift(yy_state_1786)
+    T_UIDENT => Shift(yy_state_1068)
+    NT_batch_type_alias_target_UIDENT_ => Shift(yy_state_1071)
+    T_PACKAGE_NAME => Shift(yy_state_1072)
+    NT_batch_type_alias_targets => Shift(yy_state_1834)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1786(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1834(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(4, NT_structure_item, yy_action_49)
 }
 
 ///|
-fn yy_state_1787(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1835(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
     T_AMPER => Shift(yy_state_58)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_batch_type_alias_target_UIDENT_ => Shift(yy_state_1063)
-    T_UIDENT => Shift(yy_state_1079)
-    T_PACKAGE_NAME => Shift(yy_state_1080)
-    NT_type_ => Shift(yy_state_1788)
-    NT_batch_type_alias_targets => Shift(yy_state_1792)
+    NT_batch_type_alias_target_UIDENT_ => Shift(yy_state_1071)
+    T_UIDENT => Shift(yy_state_1087)
+    T_PACKAGE_NAME => Shift(yy_state_1088)
+    NT_type_ => Shift(yy_state_1836)
+    NT_batch_type_alias_targets => Shift(yy_state_1840)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1788(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1836(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_AS => Shift(yy_state_1789)
+    T_AS => Shift(yy_state_1837)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1789(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1837(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1790)
+    T_UIDENT => Shift(yy_state_1838)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1790(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1838(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACKET => Shift(yy_state_849)
+    T_LBRACKET => Shift(yy_state_857)
     NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__ =>
-      Shift(yy_state_860)
-    NT_optional_type_parameters_no_constraints => Shift(yy_state_1791)
+      Shift(yy_state_868)
+    NT_optional_type_parameters_no_constraints => Shift(yy_state_1839)
     T_EOF | T_SEMI =>
       Reduce(
         0,
         NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__,
-        yy_action_384,
+        yy_action_394,
       )
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1791(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1839(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(7, NT_structure_item, yy_action_48)
 }
 
 ///|
-fn yy_state_1792(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1840(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(4, NT_structure_item, yy_action_47)
 }
 
 ///|
-fn yy_state_1793(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1841(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1794)
+    T_UIDENT => Shift(yy_state_1842)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1794(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1842(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_1089)
+    T_COLON => Shift(yy_state_1097)
     NT_option_preceded_COLON_separated_nonempty_list_PLUS_tvar_constraint___ =>
-      Shift(yy_state_1795)
+      Shift(yy_state_1843)
     T_LBRACE =>
       Reduce(
         0,
         NT_option_preceded_COLON_separated_nonempty_list_PLUS_tvar_constraint___,
-        yy_action_268,
+        yy_action_278,
       )
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1795(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1843(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACE => Shift(yy_state_1796)
+    T_LBRACE => Shift(yy_state_1844)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1796(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1844(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_ATTRIBUTE => Shift(yy_state_845)
-    NT_trait_method_decl => Shift(yy_state_1093)
-    NT_non_empty_list_attribute_ => Shift(yy_state_1097)
-    T_LIDENT => Shift(yy_state_1134)
-    T_ASYNC => Shift(yy_state_1142)
-    NT_non_empty_list_semis_trait_method_decl_ => Shift(yy_state_1151)
-    NT_list_semis_trait_method_decl_ => Shift(yy_state_1797)
-    T_RBRACE => Reduce(0, NT_list_semis_trait_method_decl_, yy_action_265)
+    T_ATTRIBUTE => Shift(yy_state_853)
+    NT_trait_method_decl => Shift(yy_state_1101)
+    NT_non_empty_list_attribute_ => Shift(yy_state_1105)
+    T_LIDENT => Shift(yy_state_1142)
+    T_ASYNC => Shift(yy_state_1150)
+    NT_non_empty_list_semis_trait_method_decl_ => Shift(yy_state_1159)
+    NT_list_semis_trait_method_decl_ => Shift(yy_state_1845)
+    T_RBRACE => Reduce(0, NT_list_semis_trait_method_decl_, yy_action_275)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1797(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1845(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RBRACE => Shift(yy_state_1798)
+    T_RBRACE => Shift(yy_state_1846)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1798(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1846(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(8, NT_structure_item, yy_action_46)
 }
 
 ///|
-fn yy_state_1799(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1847(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1155)
-    T_LIDENT => Shift(yy_state_1157)
-    NT_option_func_alias_type_name_LIDENT_UIDENT__ => Shift(yy_state_1162)
-    T_PACKAGE_NAME => Shift(yy_state_1172)
-    NT_func_alias_type_name_LIDENT_UIDENT_ => Shift(yy_state_1187)
-    NT_func_alias_target_LIDENT_ => Shift(yy_state_1189)
-    NT_func_alias_targets => Shift(yy_state_1800)
+    T_UIDENT => Shift(yy_state_1163)
+    T_LIDENT => Shift(yy_state_1165)
+    NT_option_func_alias_type_name_LIDENT_UIDENT__ => Shift(yy_state_1170)
+    T_PACKAGE_NAME => Shift(yy_state_1180)
+    NT_func_alias_type_name_LIDENT_UIDENT_ => Shift(yy_state_1195)
+    NT_func_alias_target_LIDENT_ => Shift(yy_state_1197)
+    NT_func_alias_targets => Shift(yy_state_1848)
     T_LPAREN =>
-      Reduce(0, NT_option_func_alias_type_name_LIDENT_UIDENT__, yy_action_243)
+      Reduce(0, NT_option_func_alias_type_name_LIDENT_UIDENT__, yy_action_253)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1800(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1848(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(4, NT_structure_item, yy_action_45)
 }
 
 ///|
-fn yy_state_1801(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1849(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1802)
+    T_UIDENT => Shift(yy_state_1850)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1802(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1850(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_1803)
+    T_COLON => Shift(yy_state_1851)
     T_EQUAL => Reduce(4, NT_val_header, yy_action_44)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1803(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1851(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -51873,35 +53232,35 @@ fn yy_state_1803(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_type_ => Shift(yy_state_1804)
+    NT_type_ => Shift(yy_state_1852)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1804(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1852(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(6, NT_val_header, yy_action_43)
 }
 
 ///|
-fn yy_state_1805(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1853(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LIDENT => Shift(yy_state_1806)
+    T_LIDENT => Shift(yy_state_1854)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1806(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1854(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_1807)
+    T_COLON => Shift(yy_state_1855)
     T_EQUAL => Reduce(4, NT_val_header, yy_action_42)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1807(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1855(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -51910,322 +53269,322 @@ fn yy_state_1807(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_type_ => Shift(yy_state_1808)
+    NT_type_ => Shift(yy_state_1856)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1808(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1856(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(6, NT_val_header, yy_action_41)
 }
 
 ///|
-fn yy_state_1809(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1857(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_TYPE => Shift(yy_state_1810)
-    T_STRING => Shift(yy_state_1814)
+    T_TYPE => Shift(yy_state_1858)
+    T_STRING => Shift(yy_state_1862)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1810(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1858(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1811)
+    T_UIDENT => Shift(yy_state_1859)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1811(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1859(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACKET => Shift(yy_state_849)
+    T_LBRACKET => Shift(yy_state_857)
     NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__ =>
-      Shift(yy_state_860)
-    NT_optional_type_parameters_no_constraints => Shift(yy_state_1812)
+      Shift(yy_state_868)
+    NT_optional_type_parameters_no_constraints => Shift(yy_state_1860)
     T_EOF | T_DERIVE | T_SEMI =>
       Reduce(
         0,
         NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__,
-        yy_action_384,
+        yy_action_394,
       )
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1812(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1860(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_DERIVE => Shift(yy_state_973)
-    NT_deriving_directive_list => Shift(yy_state_1813)
-    T_EOF | T_SEMI => Reduce(0, NT_deriving_directive_list, yy_action_315)
+    T_DERIVE => Shift(yy_state_981)
+    NT_deriving_directive_list => Shift(yy_state_1861)
+    T_EOF | T_SEMI => Reduce(0, NT_deriving_directive_list, yy_action_325)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1813(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1861(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(7, NT_structure_item, yy_action_40)
 }
 
 ///|
-fn yy_state_1814(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1862(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_FN => Shift(yy_state_1815)
+    T_FN => Shift(yy_state_1863)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1815(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1863(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_AMPER => Shift(yy_state_18)
     T_PACKAGE_NAME => Shift(yy_state_20)
     T_UIDENT => Shift(yy_state_23)
     NT_qual_ident_ty => Shift(yy_state_24)
-    T_LIDENT => Shift(yy_state_1257)
-    NT_type_name => Shift(yy_state_1258)
-    NT_fun_binder => Shift(yy_state_1816)
+    T_LIDENT => Shift(yy_state_1305)
+    NT_type_name => Shift(yy_state_1306)
+    NT_fun_binder => Shift(yy_state_1864)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1816(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1864(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_EXCLAMATION => Shift(yy_state_726)
-    NT_optional_bang => Shift(yy_state_1817)
+    T_EXCLAMATION => Shift(yy_state_734)
+    NT_optional_bang => Shift(yy_state_1865)
     T_RAISE | T_EQUAL | T_LPAREN | T_LBRACKET | T_THIN_ARROW | T_NORAISE =>
-      Reduce(0, NT_optional_bang, yy_action_851)
+      Reduce(0, NT_optional_bang, yy_action_863)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1817(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1865(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_type_parameters => Shift(yy_state_895)
-    NT_option_type_parameters_ => Shift(yy_state_935)
-    T_LBRACKET => Shift(yy_state_936)
-    NT_optional_type_parameters => Shift(yy_state_1818)
+    NT_type_parameters => Shift(yy_state_903)
+    NT_option_type_parameters_ => Shift(yy_state_943)
+    T_LBRACKET => Shift(yy_state_944)
+    NT_optional_type_parameters => Shift(yy_state_1866)
     T_RAISE | T_EQUAL | T_LPAREN | T_THIN_ARROW | T_NORAISE =>
-      Reduce(0, NT_option_type_parameters_, yy_action_356)
+      Reduce(0, NT_option_type_parameters_, yy_action_366)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1818(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1866(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LPAREN => Shift(yy_state_148)
-    NT_parameters => Shift(yy_state_1056)
-    NT_option_parameters_ => Shift(yy_state_1819)
+    NT_parameters => Shift(yy_state_1064)
+    NT_option_parameters_ => Shift(yy_state_1867)
     T_RAISE | T_EQUAL | T_THIN_ARROW | T_NORAISE =>
-      Reduce(0, NT_option_parameters_, yy_action_284)
+      Reduce(0, NT_option_parameters_, yy_action_294)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1819(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1867(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_error_annotation => Shift(yy_state_50)
     T_THIN_ARROW => Shift(yy_state_51)
     T_NORAISE => Shift(yy_state_83)
     T_RAISE => Shift(yy_state_84)
-    NT_func_return_type => Shift(yy_state_1820)
-    T_EQUAL => Reduce(0, NT_func_return_type, yy_action_850)
+    NT_func_return_type => Shift(yy_state_1868)
+    T_EQUAL => Reduce(0, NT_func_return_type, yy_action_862)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1820(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1868(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(10, NT_extern_fun_header, yy_action_39)
 }
 
 ///|
-fn yy_state_1821(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1869(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LPAREN => Shift(yy_state_148)
-    NT_parameters => Shift(yy_state_1056)
-    NT_option_parameters_ => Shift(yy_state_1822)
+    NT_parameters => Shift(yy_state_1064)
+    NT_option_parameters_ => Shift(yy_state_1870)
     T_RAISE | T_EQUAL | T_LBRACE | T_THIN_ARROW | T_NORAISE =>
-      Reduce(0, NT_option_parameters_, yy_action_284)
+      Reduce(0, NT_option_parameters_, yy_action_294)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1822(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1870(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_error_annotation => Shift(yy_state_50)
     T_THIN_ARROW => Shift(yy_state_51)
     T_NORAISE => Shift(yy_state_83)
     T_RAISE => Shift(yy_state_84)
-    NT_func_return_type => Shift(yy_state_1823)
-    T_EQUAL | T_LBRACE => Reduce(0, NT_func_return_type, yy_action_850)
+    NT_func_return_type => Shift(yy_state_1871)
+    T_EQUAL | T_LBRACE => Reduce(0, NT_func_return_type, yy_action_862)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1823(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1871(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(5, NT_fun_header, yy_action_38)
 }
 
 ///|
-fn yy_state_1824(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1872(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_FN => Shift(yy_state_1261)
-    NT_fun_header_generic => Shift(yy_state_1825)
+    T_FN => Shift(yy_state_1309)
+    NT_fun_header_generic => Shift(yy_state_1873)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1825(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1873(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LPAREN => Shift(yy_state_148)
-    NT_parameters => Shift(yy_state_1056)
-    NT_option_parameters_ => Shift(yy_state_1826)
+    NT_parameters => Shift(yy_state_1064)
+    NT_option_parameters_ => Shift(yy_state_1874)
     T_RAISE | T_EQUAL | T_LBRACE | T_THIN_ARROW | T_NORAISE =>
-      Reduce(0, NT_option_parameters_, yy_action_284)
+      Reduce(0, NT_option_parameters_, yy_action_294)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1826(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1874(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_error_annotation => Shift(yy_state_50)
     T_THIN_ARROW => Shift(yy_state_51)
     T_NORAISE => Shift(yy_state_83)
     T_RAISE => Shift(yy_state_84)
-    NT_func_return_type => Shift(yy_state_1827)
-    T_EQUAL | T_LBRACE => Reduce(0, NT_func_return_type, yy_action_850)
+    NT_func_return_type => Shift(yy_state_1875)
+    T_EQUAL | T_LBRACE => Reduce(0, NT_func_return_type, yy_action_862)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1827(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1875(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(6, NT_fun_header, yy_action_36)
 }
 
 ///|
-fn yy_state_1828(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1876(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_FN => Shift(yy_state_1261)
-    T_ENUM => Shift(yy_state_1829)
-    T_STRUCT => Shift(yy_state_1832)
-    T_SUBERROR => Shift(yy_state_1835)
-    T_TYPE => Shift(yy_state_1837)
-    T_USING => Shift(yy_state_1840)
-    T_ENUMVIEW => Shift(yy_state_1845)
-    T_IMPL => Shift(yy_state_1857)
-    T_TRAITALIAS => Shift(yy_state_1874)
-    T_TYPEALIAS => Shift(yy_state_1876)
-    T_TRAIT => Shift(yy_state_1882)
-    T_FNALIAS => Shift(yy_state_1888)
-    T_CONST => Shift(yy_state_1890)
-    T_LET => Shift(yy_state_1894)
-    T_EXTERN => Shift(yy_state_1898)
-    NT_fun_header_generic => Shift(yy_state_1910)
-    T_ASYNC => Shift(yy_state_1913)
+    T_FN => Shift(yy_state_1309)
+    T_ENUM => Shift(yy_state_1877)
+    T_STRUCT => Shift(yy_state_1880)
+    T_SUBERROR => Shift(yy_state_1883)
+    T_TYPE => Shift(yy_state_1885)
+    T_USING => Shift(yy_state_1888)
+    T_ENUMVIEW => Shift(yy_state_1893)
+    T_IMPL => Shift(yy_state_1905)
+    T_TRAITALIAS => Shift(yy_state_1922)
+    T_TYPEALIAS => Shift(yy_state_1924)
+    T_TRAIT => Shift(yy_state_1930)
+    T_FNALIAS => Shift(yy_state_1936)
+    T_CONST => Shift(yy_state_1938)
+    T_LET => Shift(yy_state_1942)
+    T_EXTERN => Shift(yy_state_1946)
+    NT_fun_header_generic => Shift(yy_state_1958)
+    T_ASYNC => Shift(yy_state_1961)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1829(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1877(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1830)
+    T_UIDENT => Shift(yy_state_1878)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1830(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1878(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACKET => Shift(yy_state_849)
+    T_LBRACKET => Shift(yy_state_857)
     NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__ =>
-      Shift(yy_state_860)
-    NT_optional_type_parameters_no_constraints => Shift(yy_state_1831)
+      Shift(yy_state_868)
+    NT_optional_type_parameters_no_constraints => Shift(yy_state_1879)
     T_LBRACE =>
       Reduce(
         0,
         NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__,
-        yy_action_384,
+        yy_action_394,
       )
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1831(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1879(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(4, NT_enum_header, yy_action_35)
 }
 
 ///|
-fn yy_state_1832(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1880(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1833)
+    T_UIDENT => Shift(yy_state_1881)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1833(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1881(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACKET => Shift(yy_state_849)
+    T_LBRACKET => Shift(yy_state_857)
     NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__ =>
-      Shift(yy_state_860)
-    NT_optional_type_parameters_no_constraints => Shift(yy_state_1834)
+      Shift(yy_state_868)
+    NT_optional_type_parameters_no_constraints => Shift(yy_state_1882)
     T_LPAREN | T_LBRACE =>
       Reduce(
         0,
         NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__,
-        yy_action_384,
+        yy_action_394,
       )
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1834(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1882(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(4, NT_struct_header, yy_action_34)
 }
 
 ///|
-fn yy_state_1835(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1883(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1836)
+    T_UIDENT => Shift(yy_state_1884)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1836(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1884(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(3, NT_suberror_header, yy_action_33)
 }
 
 ///|
-fn yy_state_1837(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1885(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1838)
+    T_UIDENT => Shift(yy_state_1886)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1838(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1886(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACKET => Shift(yy_state_849)
+    T_LBRACKET => Shift(yy_state_857)
     NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__ =>
-      Shift(yy_state_860)
-    NT_optional_type_parameters_no_constraints => Shift(yy_state_1839)
+      Shift(yy_state_868)
+    NT_optional_type_parameters_no_constraints => Shift(yy_state_1887)
     T_UIDENT
     | T_EOF
     | T_DERIVE
@@ -52239,122 +53598,122 @@ fn yy_state_1838(_lookahead : YYSymbol) -> YYDecision {
       Reduce(
         0,
         NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__,
-        yy_action_384,
+        yy_action_394,
       )
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1839(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1887(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(4, NT_type_header, yy_action_32)
 }
 
 ///|
-fn yy_state_1840(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1888(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_PACKAGE_NAME => Shift(yy_state_1841)
+    T_PACKAGE_NAME => Shift(yy_state_1889)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1841(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1889(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACE => Shift(yy_state_1842)
+    T_LBRACE => Shift(yy_state_1890)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1842(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1890(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_using_binder => Shift(yy_state_872)
-    NT_non_empty_list_commas_rev_using_binder_ => Shift(yy_state_873)
-    T_TRAIT => Shift(yy_state_877)
-    T_TYPE => Shift(yy_state_881)
-    T_UIDENT => Shift(yy_state_885)
-    T_LIDENT => Shift(yy_state_888)
-    NT_non_empty_list_commas_using_binder_ => Shift(yy_state_891)
-    NT_list_commas_using_binder_ => Shift(yy_state_1843)
-    T_RBRACE => Reduce(0, NT_list_commas_using_binder_, yy_action_370)
+    NT_using_binder => Shift(yy_state_880)
+    NT_non_empty_list_commas_rev_using_binder_ => Shift(yy_state_881)
+    T_TRAIT => Shift(yy_state_885)
+    T_TYPE => Shift(yy_state_889)
+    T_UIDENT => Shift(yy_state_893)
+    T_LIDENT => Shift(yy_state_896)
+    NT_non_empty_list_commas_using_binder_ => Shift(yy_state_899)
+    NT_list_commas_using_binder_ => Shift(yy_state_1891)
+    T_RBRACE => Reduce(0, NT_list_commas_using_binder_, yy_action_380)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1843(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1891(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RBRACE => Shift(yy_state_1844)
+    T_RBRACE => Shift(yy_state_1892)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1844(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1892(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(6, NT_structure_item, yy_action_31)
 }
 
 ///|
-fn yy_state_1845(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1893(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_type_parameters => Shift(yy_state_895)
-    NT_option_type_parameters_ => Shift(yy_state_935)
-    T_LBRACKET => Shift(yy_state_936)
-    NT_optional_type_parameters => Shift(yy_state_1846)
-    T_UIDENT => Reduce(0, NT_option_type_parameters_, yy_action_356)
+    NT_type_parameters => Shift(yy_state_903)
+    NT_option_type_parameters_ => Shift(yy_state_943)
+    T_LBRACKET => Shift(yy_state_944)
+    NT_optional_type_parameters => Shift(yy_state_1894)
+    T_UIDENT => Reduce(0, NT_option_type_parameters_, yy_action_366)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1846(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1894(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1847)
+    T_UIDENT => Shift(yy_state_1895)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1847(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1895(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACE => Shift(yy_state_1848)
+    T_LBRACE => Shift(yy_state_1896)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1848(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1896(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_ATTRIBUTE => Shift(yy_state_845)
-    NT_enum_constructor => Shift(yy_state_899)
-    NT_non_empty_list_attribute_ => Shift(yy_state_903)
-    T_UIDENT => Shift(yy_state_923)
-    NT_non_empty_list_semis_enum_constructor_ => Shift(yy_state_926)
-    NT_list_semis_enum_constructor_ => Shift(yy_state_1849)
-    T_RBRACE => Reduce(0, NT_list_semis_enum_constructor_, yy_action_354)
+    T_ATTRIBUTE => Shift(yy_state_853)
+    NT_enum_constructor => Shift(yy_state_907)
+    NT_non_empty_list_attribute_ => Shift(yy_state_911)
+    T_UIDENT => Shift(yy_state_931)
+    NT_non_empty_list_semis_enum_constructor_ => Shift(yy_state_934)
+    NT_list_semis_enum_constructor_ => Shift(yy_state_1897)
+    T_RBRACE => Reduce(0, NT_list_semis_enum_constructor_, yy_action_364)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1849(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1897(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RBRACE => Shift(yy_state_1850)
+    T_RBRACE => Shift(yy_state_1898)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1850(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1898(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_FOR => Shift(yy_state_1851)
+    T_FOR => Shift(yy_state_1899)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1851(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1899(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -52363,142 +53722,142 @@ fn yy_state_1851(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_type_ => Shift(yy_state_1852)
+    NT_type_ => Shift(yy_state_1900)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1852(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1900(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_WITH => Shift(yy_state_1853)
+    T_WITH => Shift(yy_state_1901)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1853(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1901(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LIDENT => Shift(yy_state_1854)
+    T_LIDENT => Shift(yy_state_1902)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1854(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1902(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LPAREN => Shift(yy_state_148)
-    NT_parameters => Shift(yy_state_1855)
+    NT_parameters => Shift(yy_state_1903)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1855(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1903(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LBRACE => Shift(yy_state_124)
-    NT_block_expr => Shift(yy_state_1856)
+    NT_block_expr => Shift(yy_state_1904)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1856(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1904(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(13, NT_structure_item, yy_action_30)
 }
 
 ///|
-fn yy_state_1857(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1905(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_type_parameters => Shift(yy_state_895)
-    NT_option_type_parameters_ => Shift(yy_state_935)
-    T_LBRACKET => Shift(yy_state_936)
-    NT_optional_type_parameters => Shift(yy_state_1858)
+    NT_type_parameters => Shift(yy_state_903)
+    NT_option_type_parameters_ => Shift(yy_state_943)
+    T_LBRACKET => Shift(yy_state_944)
+    NT_optional_type_parameters => Shift(yy_state_1906)
     T_UIDENT | T_AMPER | T_PACKAGE_NAME =>
-      Reduce(0, NT_option_type_parameters_, yy_action_356)
+      Reduce(0, NT_option_type_parameters_, yy_action_366)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1858(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1906(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_AMPER => Shift(yy_state_18)
     T_PACKAGE_NAME => Shift(yy_state_20)
     T_UIDENT => Shift(yy_state_23)
     NT_qual_ident_ty => Shift(yy_state_24)
-    NT_type_name => Shift(yy_state_1859)
+    NT_type_name => Shift(yy_state_1907)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1859(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1907(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_WITH => Shift(yy_state_1860)
-    T_FOR => Shift(yy_state_1866)
+    T_WITH => Shift(yy_state_1908)
+    T_FOR => Shift(yy_state_1914)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1860(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1908(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LIDENT => Shift(yy_state_1861)
+    T_LIDENT => Shift(yy_state_1909)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1861(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1909(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_EXCLAMATION => Shift(yy_state_726)
-    NT_optional_bang => Shift(yy_state_1862)
-    T_LPAREN => Reduce(0, NT_optional_bang, yy_action_851)
+    T_EXCLAMATION => Shift(yy_state_734)
+    NT_optional_bang => Shift(yy_state_1910)
+    T_LPAREN => Reduce(0, NT_optional_bang, yy_action_863)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1862(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1910(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LPAREN => Shift(yy_state_148)
-    NT_parameters => Shift(yy_state_1863)
+    NT_parameters => Shift(yy_state_1911)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1863(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1911(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_error_annotation => Shift(yy_state_50)
     T_THIN_ARROW => Shift(yy_state_51)
     T_NORAISE => Shift(yy_state_83)
     T_RAISE => Shift(yy_state_84)
-    NT_func_return_type => Shift(yy_state_1864)
-    T_EQUAL | T_LBRACE => Reduce(0, NT_func_return_type, yy_action_850)
+    NT_func_return_type => Shift(yy_state_1912)
+    T_EQUAL | T_LBRACE => Reduce(0, NT_func_return_type, yy_action_862)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1864(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1912(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_EQUAL => Shift(yy_state_960)
-    NT_block_expr_with_local_types => Shift(yy_state_962)
-    T_LBRACE => Shift(yy_state_963)
-    NT_impl_body => Shift(yy_state_1865)
+    T_EQUAL => Shift(yy_state_968)
+    NT_block_expr_with_local_types => Shift(yy_state_970)
+    T_LBRACE => Shift(yy_state_971)
+    NT_impl_body => Shift(yy_state_1913)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1865(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1913(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(10, NT_structure_item, yy_action_29)
 }
 
 ///|
-fn yy_state_1866(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1914(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -52507,252 +53866,252 @@ fn yy_state_1866(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_type_ => Shift(yy_state_1867)
+    NT_type_ => Shift(yy_state_1915)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1867(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1915(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_WITH => Shift(yy_state_1868)
+    T_WITH => Shift(yy_state_1916)
     T_EOF | T_SEMI => Reduce(6, NT_structure_item, yy_action_28)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1868(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1916(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LIDENT => Shift(yy_state_1869)
+    T_LIDENT => Shift(yy_state_1917)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1869(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1917(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_EXCLAMATION => Shift(yy_state_726)
-    NT_optional_bang => Shift(yy_state_1870)
-    T_LPAREN => Reduce(0, NT_optional_bang, yy_action_851)
+    T_EXCLAMATION => Shift(yy_state_734)
+    NT_optional_bang => Shift(yy_state_1918)
+    T_LPAREN => Reduce(0, NT_optional_bang, yy_action_863)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1870(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1918(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LPAREN => Shift(yy_state_148)
-    NT_parameters => Shift(yy_state_1871)
+    NT_parameters => Shift(yy_state_1919)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1871(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1919(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_error_annotation => Shift(yy_state_50)
     T_THIN_ARROW => Shift(yy_state_51)
     T_NORAISE => Shift(yy_state_83)
     T_RAISE => Shift(yy_state_84)
-    NT_func_return_type => Shift(yy_state_1872)
-    T_EQUAL | T_LBRACE => Reduce(0, NT_func_return_type, yy_action_850)
+    NT_func_return_type => Shift(yy_state_1920)
+    T_EQUAL | T_LBRACE => Reduce(0, NT_func_return_type, yy_action_862)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1872(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1920(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_EQUAL => Shift(yy_state_960)
-    NT_block_expr_with_local_types => Shift(yy_state_962)
-    T_LBRACE => Shift(yy_state_963)
-    NT_impl_body => Shift(yy_state_1873)
+    T_EQUAL => Shift(yy_state_968)
+    NT_block_expr_with_local_types => Shift(yy_state_970)
+    T_LBRACE => Shift(yy_state_971)
+    NT_impl_body => Shift(yy_state_1921)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1873(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1921(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(12, NT_structure_item, yy_action_27)
 }
 
 ///|
-fn yy_state_1874(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1922(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1060)
-    NT_batch_type_alias_target_UIDENT_ => Shift(yy_state_1063)
-    T_PACKAGE_NAME => Shift(yy_state_1064)
-    NT_batch_type_alias_targets => Shift(yy_state_1875)
+    T_UIDENT => Shift(yy_state_1068)
+    NT_batch_type_alias_target_UIDENT_ => Shift(yy_state_1071)
+    T_PACKAGE_NAME => Shift(yy_state_1072)
+    NT_batch_type_alias_targets => Shift(yy_state_1923)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1875(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1923(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(3, NT_structure_item, yy_action_26)
 }
 
 ///|
-fn yy_state_1876(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1924(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
     T_AMPER => Shift(yy_state_58)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_batch_type_alias_target_UIDENT_ => Shift(yy_state_1063)
-    T_UIDENT => Shift(yy_state_1079)
-    T_PACKAGE_NAME => Shift(yy_state_1080)
-    NT_type_ => Shift(yy_state_1877)
-    NT_batch_type_alias_targets => Shift(yy_state_1881)
+    NT_batch_type_alias_target_UIDENT_ => Shift(yy_state_1071)
+    T_UIDENT => Shift(yy_state_1087)
+    T_PACKAGE_NAME => Shift(yy_state_1088)
+    NT_type_ => Shift(yy_state_1925)
+    NT_batch_type_alias_targets => Shift(yy_state_1929)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1877(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1925(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_AS => Shift(yy_state_1878)
+    T_AS => Shift(yy_state_1926)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1878(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1926(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1879)
+    T_UIDENT => Shift(yy_state_1927)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1879(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1927(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACKET => Shift(yy_state_849)
+    T_LBRACKET => Shift(yy_state_857)
     NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__ =>
-      Shift(yy_state_860)
-    NT_optional_type_parameters_no_constraints => Shift(yy_state_1880)
+      Shift(yy_state_868)
+    NT_optional_type_parameters_no_constraints => Shift(yy_state_1928)
     T_EOF | T_SEMI =>
       Reduce(
         0,
         NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__,
-        yy_action_384,
+        yy_action_394,
       )
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1880(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1928(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(6, NT_structure_item, yy_action_25)
 }
 
 ///|
-fn yy_state_1881(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1929(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(3, NT_structure_item, yy_action_24)
 }
 
 ///|
-fn yy_state_1882(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1930(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1883)
+    T_UIDENT => Shift(yy_state_1931)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1883(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1931(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_1089)
+    T_COLON => Shift(yy_state_1097)
     NT_option_preceded_COLON_separated_nonempty_list_PLUS_tvar_constraint___ =>
-      Shift(yy_state_1884)
+      Shift(yy_state_1932)
     T_LBRACE =>
       Reduce(
         0,
         NT_option_preceded_COLON_separated_nonempty_list_PLUS_tvar_constraint___,
-        yy_action_268,
+        yy_action_278,
       )
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1884(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1932(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACE => Shift(yy_state_1885)
+    T_LBRACE => Shift(yy_state_1933)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1885(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1933(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_ATTRIBUTE => Shift(yy_state_845)
-    NT_trait_method_decl => Shift(yy_state_1093)
-    NT_non_empty_list_attribute_ => Shift(yy_state_1097)
-    T_LIDENT => Shift(yy_state_1134)
-    T_ASYNC => Shift(yy_state_1142)
-    NT_non_empty_list_semis_trait_method_decl_ => Shift(yy_state_1151)
-    NT_list_semis_trait_method_decl_ => Shift(yy_state_1886)
-    T_RBRACE => Reduce(0, NT_list_semis_trait_method_decl_, yy_action_265)
+    T_ATTRIBUTE => Shift(yy_state_853)
+    NT_trait_method_decl => Shift(yy_state_1101)
+    NT_non_empty_list_attribute_ => Shift(yy_state_1105)
+    T_LIDENT => Shift(yy_state_1142)
+    T_ASYNC => Shift(yy_state_1150)
+    NT_non_empty_list_semis_trait_method_decl_ => Shift(yy_state_1159)
+    NT_list_semis_trait_method_decl_ => Shift(yy_state_1934)
+    T_RBRACE => Reduce(0, NT_list_semis_trait_method_decl_, yy_action_275)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1886(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1934(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_RBRACE => Shift(yy_state_1887)
+    T_RBRACE => Shift(yy_state_1935)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1887(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1935(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(7, NT_structure_item, yy_action_23)
 }
 
 ///|
-fn yy_state_1888(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1936(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1155)
-    T_LIDENT => Shift(yy_state_1157)
-    NT_option_func_alias_type_name_LIDENT_UIDENT__ => Shift(yy_state_1162)
-    T_PACKAGE_NAME => Shift(yy_state_1172)
-    NT_func_alias_type_name_LIDENT_UIDENT_ => Shift(yy_state_1187)
-    NT_func_alias_target_LIDENT_ => Shift(yy_state_1189)
-    NT_func_alias_targets => Shift(yy_state_1889)
+    T_UIDENT => Shift(yy_state_1163)
+    T_LIDENT => Shift(yy_state_1165)
+    NT_option_func_alias_type_name_LIDENT_UIDENT__ => Shift(yy_state_1170)
+    T_PACKAGE_NAME => Shift(yy_state_1180)
+    NT_func_alias_type_name_LIDENT_UIDENT_ => Shift(yy_state_1195)
+    NT_func_alias_target_LIDENT_ => Shift(yy_state_1197)
+    NT_func_alias_targets => Shift(yy_state_1937)
     T_LPAREN =>
-      Reduce(0, NT_option_func_alias_type_name_LIDENT_UIDENT__, yy_action_243)
+      Reduce(0, NT_option_func_alias_type_name_LIDENT_UIDENT__, yy_action_253)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1889(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1937(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(3, NT_structure_item, yy_action_22)
 }
 
 ///|
-fn yy_state_1890(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1938(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1891)
+    T_UIDENT => Shift(yy_state_1939)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1891(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1939(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_1892)
+    T_COLON => Shift(yy_state_1940)
     T_EQUAL => Reduce(3, NT_val_header, yy_action_21)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1892(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1940(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -52761,35 +54120,35 @@ fn yy_state_1892(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_type_ => Shift(yy_state_1893)
+    NT_type_ => Shift(yy_state_1941)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1893(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1941(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(5, NT_val_header, yy_action_20)
 }
 
 ///|
-fn yy_state_1894(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1942(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LIDENT => Shift(yy_state_1895)
+    T_LIDENT => Shift(yy_state_1943)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1895(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1943(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_COLON => Shift(yy_state_1896)
+    T_COLON => Shift(yy_state_1944)
     T_EQUAL => Reduce(3, NT_val_header, yy_action_18)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1896(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1944(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_ASYNC => Shift(yy_state_52)
     T_UNDERSCORE => Shift(yy_state_57)
@@ -52798,330 +54157,330 @@ fn yy_state_1896(_lookahead : YYSymbol) -> YYDecision {
     T_UIDENT => Shift(yy_state_67)
     T_LPAREN => Shift(yy_state_71)
     NT_simple_type => Shift(yy_state_100)
-    NT_type_ => Shift(yy_state_1897)
+    NT_type_ => Shift(yy_state_1945)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1897(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1945(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(5, NT_val_header, yy_action_14)
 }
 
 ///|
-fn yy_state_1898(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1946(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_TYPE => Shift(yy_state_1899)
-    T_STRING => Shift(yy_state_1903)
+    T_TYPE => Shift(yy_state_1947)
+    T_STRING => Shift(yy_state_1951)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1899(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1947(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_UIDENT => Shift(yy_state_1900)
+    T_UIDENT => Shift(yy_state_1948)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1900(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1948(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACKET => Shift(yy_state_849)
+    T_LBRACKET => Shift(yy_state_857)
     NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__ =>
-      Shift(yy_state_860)
-    NT_optional_type_parameters_no_constraints => Shift(yy_state_1901)
+      Shift(yy_state_868)
+    NT_optional_type_parameters_no_constraints => Shift(yy_state_1949)
     T_EOF | T_DERIVE | T_SEMI =>
       Reduce(
         0,
         NT_option_delimited_LBRACKET_non_empty_list_commas_id_type_decl_binder___RBRACKET__,
-        yy_action_384,
+        yy_action_394,
       )
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1901(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1949(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_DERIVE => Shift(yy_state_973)
-    NT_deriving_directive_list => Shift(yy_state_1902)
-    T_EOF | T_SEMI => Reduce(0, NT_deriving_directive_list, yy_action_315)
+    T_DERIVE => Shift(yy_state_981)
+    NT_deriving_directive_list => Shift(yy_state_1950)
+    T_EOF | T_SEMI => Reduce(0, NT_deriving_directive_list, yy_action_325)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1902(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1950(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(6, NT_structure_item, yy_action_13)
 }
 
 ///|
-fn yy_state_1903(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1951(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_FN => Shift(yy_state_1904)
+    T_FN => Shift(yy_state_1952)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1904(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1952(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_AMPER => Shift(yy_state_18)
     T_PACKAGE_NAME => Shift(yy_state_20)
     T_UIDENT => Shift(yy_state_23)
     NT_qual_ident_ty => Shift(yy_state_24)
-    T_LIDENT => Shift(yy_state_1257)
-    NT_type_name => Shift(yy_state_1258)
-    NT_fun_binder => Shift(yy_state_1905)
+    T_LIDENT => Shift(yy_state_1305)
+    NT_type_name => Shift(yy_state_1306)
+    NT_fun_binder => Shift(yy_state_1953)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1905(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1953(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_EXCLAMATION => Shift(yy_state_726)
-    NT_optional_bang => Shift(yy_state_1906)
+    T_EXCLAMATION => Shift(yy_state_734)
+    NT_optional_bang => Shift(yy_state_1954)
     T_RAISE | T_EQUAL | T_LPAREN | T_LBRACKET | T_THIN_ARROW | T_NORAISE =>
-      Reduce(0, NT_optional_bang, yy_action_851)
+      Reduce(0, NT_optional_bang, yy_action_863)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1906(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1954(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    NT_type_parameters => Shift(yy_state_895)
-    NT_option_type_parameters_ => Shift(yy_state_935)
-    T_LBRACKET => Shift(yy_state_936)
-    NT_optional_type_parameters => Shift(yy_state_1907)
+    NT_type_parameters => Shift(yy_state_903)
+    NT_option_type_parameters_ => Shift(yy_state_943)
+    T_LBRACKET => Shift(yy_state_944)
+    NT_optional_type_parameters => Shift(yy_state_1955)
     T_RAISE | T_EQUAL | T_LPAREN | T_THIN_ARROW | T_NORAISE =>
-      Reduce(0, NT_option_type_parameters_, yy_action_356)
+      Reduce(0, NT_option_type_parameters_, yy_action_366)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1907(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1955(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LPAREN => Shift(yy_state_148)
-    NT_parameters => Shift(yy_state_1056)
-    NT_option_parameters_ => Shift(yy_state_1908)
+    NT_parameters => Shift(yy_state_1064)
+    NT_option_parameters_ => Shift(yy_state_1956)
     T_RAISE | T_EQUAL | T_THIN_ARROW | T_NORAISE =>
-      Reduce(0, NT_option_parameters_, yy_action_284)
+      Reduce(0, NT_option_parameters_, yy_action_294)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1908(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1956(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_error_annotation => Shift(yy_state_50)
     T_THIN_ARROW => Shift(yy_state_51)
     T_NORAISE => Shift(yy_state_83)
     T_RAISE => Shift(yy_state_84)
-    NT_func_return_type => Shift(yy_state_1909)
-    T_EQUAL => Reduce(0, NT_func_return_type, yy_action_850)
+    NT_func_return_type => Shift(yy_state_1957)
+    T_EQUAL => Reduce(0, NT_func_return_type, yy_action_862)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1909(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1957(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(9, NT_extern_fun_header, yy_action_12)
 }
 
 ///|
-fn yy_state_1910(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1958(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LPAREN => Shift(yy_state_148)
-    NT_parameters => Shift(yy_state_1056)
-    NT_option_parameters_ => Shift(yy_state_1911)
+    NT_parameters => Shift(yy_state_1064)
+    NT_option_parameters_ => Shift(yy_state_1959)
     T_RAISE | T_EQUAL | T_LBRACE | T_THIN_ARROW | T_NORAISE =>
-      Reduce(0, NT_option_parameters_, yy_action_284)
+      Reduce(0, NT_option_parameters_, yy_action_294)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1911(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1959(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_error_annotation => Shift(yy_state_50)
     T_THIN_ARROW => Shift(yy_state_51)
     T_NORAISE => Shift(yy_state_83)
     T_RAISE => Shift(yy_state_84)
-    NT_func_return_type => Shift(yy_state_1912)
-    T_EQUAL | T_LBRACE => Reduce(0, NT_func_return_type, yy_action_850)
+    NT_func_return_type => Shift(yy_state_1960)
+    T_EQUAL | T_LBRACE => Reduce(0, NT_func_return_type, yy_action_862)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1912(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1960(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(4, NT_fun_header, yy_action_11)
 }
 
 ///|
-fn yy_state_1913(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1961(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_FN => Shift(yy_state_1261)
-    NT_fun_header_generic => Shift(yy_state_1914)
+    T_FN => Shift(yy_state_1309)
+    NT_fun_header_generic => Shift(yy_state_1962)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1914(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1962(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LPAREN => Shift(yy_state_148)
-    NT_parameters => Shift(yy_state_1056)
-    NT_option_parameters_ => Shift(yy_state_1915)
+    NT_parameters => Shift(yy_state_1064)
+    NT_option_parameters_ => Shift(yy_state_1963)
     T_RAISE | T_EQUAL | T_LBRACE | T_THIN_ARROW | T_NORAISE =>
-      Reduce(0, NT_option_parameters_, yy_action_284)
+      Reduce(0, NT_option_parameters_, yy_action_294)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1915(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1963(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_error_annotation => Shift(yy_state_50)
     T_THIN_ARROW => Shift(yy_state_51)
     T_NORAISE => Shift(yy_state_83)
     T_RAISE => Shift(yy_state_84)
-    NT_func_return_type => Shift(yy_state_1916)
-    T_EQUAL | T_LBRACE => Reduce(0, NT_func_return_type, yy_action_850)
+    NT_func_return_type => Shift(yy_state_1964)
+    T_EQUAL | T_LBRACE => Reduce(0, NT_func_return_type, yy_action_862)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1916(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1964(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(5, NT_fun_header, yy_action_9)
 }
 
 ///|
-fn yy_state_1917(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1965(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LPAREN => Shift(yy_state_148)
-    NT_parameters => Shift(yy_state_1056)
-    NT_option_parameters_ => Shift(yy_state_1918)
+    NT_parameters => Shift(yy_state_1064)
+    NT_option_parameters_ => Shift(yy_state_1966)
     T_RAISE | T_EQUAL | T_LBRACE | T_THIN_ARROW | T_NORAISE =>
-      Reduce(0, NT_option_parameters_, yy_action_284)
+      Reduce(0, NT_option_parameters_, yy_action_294)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1918(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1966(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_error_annotation => Shift(yy_state_50)
     T_THIN_ARROW => Shift(yy_state_51)
     T_NORAISE => Shift(yy_state_83)
     T_RAISE => Shift(yy_state_84)
-    NT_func_return_type => Shift(yy_state_1919)
-    T_EQUAL | T_LBRACE => Reduce(0, NT_func_return_type, yy_action_850)
+    NT_func_return_type => Shift(yy_state_1967)
+    T_EQUAL | T_LBRACE => Reduce(0, NT_func_return_type, yy_action_862)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1919(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1967(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(3, NT_fun_header, yy_action_7)
 }
 
 ///|
-fn yy_state_1920(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1968(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_FN => Shift(yy_state_1261)
-    T_TEST => Shift(yy_state_1921)
-    NT_fun_header_generic => Shift(yy_state_1925)
+    T_FN => Shift(yy_state_1309)
+    T_TEST => Shift(yy_state_1969)
+    NT_fun_header_generic => Shift(yy_state_1973)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1921(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1969(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_STRING => Shift(yy_state_1054)
-    NT_option_loced_string_ => Shift(yy_state_1922)
-    T_LPAREN | T_LBRACE => Reduce(0, NT_option_loced_string_, yy_action_287)
+    T_STRING => Shift(yy_state_1062)
+    NT_option_loced_string_ => Shift(yy_state_1970)
+    T_LPAREN | T_LBRACE => Reduce(0, NT_option_loced_string_, yy_action_297)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1922(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1970(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LPAREN => Shift(yy_state_148)
-    NT_parameters => Shift(yy_state_1056)
-    NT_option_parameters_ => Shift(yy_state_1923)
-    T_LBRACE => Reduce(0, NT_option_parameters_, yy_action_284)
+    NT_parameters => Shift(yy_state_1064)
+    NT_option_parameters_ => Shift(yy_state_1971)
+    T_LBRACE => Reduce(0, NT_option_parameters_, yy_action_294)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1923(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1971(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_LBRACE => Shift(yy_state_963)
-    NT_block_expr_with_local_types => Shift(yy_state_1924)
+    T_LBRACE => Shift(yy_state_971)
+    NT_block_expr_with_local_types => Shift(yy_state_1972)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1924(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1972(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(5, NT_structure_item, yy_action_6)
 }
 
 ///|
-fn yy_state_1925(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1973(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     T_LPAREN => Shift(yy_state_148)
-    NT_parameters => Shift(yy_state_1056)
-    NT_option_parameters_ => Shift(yy_state_1926)
+    NT_parameters => Shift(yy_state_1064)
+    NT_option_parameters_ => Shift(yy_state_1974)
     T_RAISE | T_EQUAL | T_LBRACE | T_THIN_ARROW | T_NORAISE =>
-      Reduce(0, NT_option_parameters_, yy_action_284)
+      Reduce(0, NT_option_parameters_, yy_action_294)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1926(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1974(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
     NT_error_annotation => Shift(yy_state_50)
     T_THIN_ARROW => Shift(yy_state_51)
     T_NORAISE => Shift(yy_state_83)
     T_RAISE => Shift(yy_state_84)
-    NT_func_return_type => Shift(yy_state_1927)
-    T_EQUAL | T_LBRACE => Reduce(0, NT_func_return_type, yy_action_850)
+    NT_func_return_type => Shift(yy_state_1975)
+    T_EQUAL | T_LBRACE => Reduce(0, NT_func_return_type, yy_action_862)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1927(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1975(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(4, NT_fun_header, yy_action_2)
 }
 
 ///|
-fn yy_state_1928(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1976(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(1, NT_list_semis_structure_item_, yy_action_1)
 }
 
 ///|
-fn yy_state_1929(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1977(_lookahead : YYSymbol) -> YYDecision {
   match _lookahead {
-    T_EOF => Shift(yy_state_1930)
+    T_EOF => Shift(yy_state_1978)
     _ => Error
   }
 }
 
 ///|
-fn yy_state_1930(_lookahead : YYSymbol) -> YYDecision {
+fn yy_state_1978(_lookahead : YYSymbol) -> YYDecision {
   ReduceNoLookahead(2, NT_structure, yy_action_0)
 }
 
@@ -53355,11 +54714,13 @@ fn error(
         (T_ENUMVIEW, TK_ENUMVIEW),
         (T_DECLARE, TK_DECLARE),
         (T_NORAISE, TK_NORAISE),
+        (T_NOBREAK, TK_NOBREAK),
         (T_WHERE, TK_WHERE),
         (T_TRY_QUESTION, TK_TRY_QUESTION),
         (T_TRY_EXCLAMATION, TK_TRY_EXCLAMATION),
         (T_LEXMATCH, TK_LEXMATCH),
         (T_LEXMATCH_QUESTION, TK_LEXMATCH_QUESTION),
+        (T_PACKAGE, TK_PACKAGE),
       ] : Array[(YYSymbol, TokenKind)]) {
     try_add(term.0, term.1)
   }
@@ -53376,7 +54737,7 @@ pub fn structure(
 ) -> List[Impl] raise ParseError {
   yy_parse(
     tokens,
-    yy_state_839,
+    yy_state_847,
     it => {
       guard it is YYObj_List_Impl_(result)
       result
diff --git a/yacc_parser/parser.mbt.map.json b/yacc_parser/parser.mbt.map.json
index e8feb223..9ba61ab1 100644
--- a/yacc_parser/parser.mbt.map.json
+++ b/yacc_parser/parser.mbt.map.json
@@ -2,21488 +2,22040 @@
   "mappings": [
     {
       "source": "parser.mbty",
-      "original_offset": 11300,
-      "generated_offset": 21511,
+      "original_offset": 11523,
+      "generated_offset": 21751,
       "length": 1
     },
     {
       "source": "parser.mbty",
-      "original_offset": 11303,
-      "generated_offset": 21520,
+      "original_offset": 11526,
+      "generated_offset": 21760,
       "length": 1
     },
     {
       "source": "parser.mbty",
-      "original_offset": 5481,
-      "generated_offset": 21763,
+      "original_offset": 5600,
+      "generated_offset": 22003,
       "length": 1
     },
     {
       "source": "parser.mbty",
-      "original_offset": 5484,
-      "generated_offset": 21772,
+      "original_offset": 5603,
+      "generated_offset": 22012,
       "length": 1
     },
     {
       "source": "parser.mbty",
-      "original_offset": 7584,
-      "generated_offset": 23168,
+      "original_offset": 7703,
+      "generated_offset": 23607,
       "length": 47
     },
     {
       "source": "parser.mbty",
-      "original_offset": 7633,
-      "generated_offset": 23223,
+      "original_offset": 7752,
+      "generated_offset": 23662,
       "length": 37
     },
     {
       "source": "parser.mbty",
-      "original_offset": 7672,
-      "generated_offset": 23268,
+      "original_offset": 7791,
+      "generated_offset": 23707,
       "length": 82
     },
     {
       "source": "parser.mbty",
-      "original_offset": 7756,
-      "generated_offset": 23358,
+      "original_offset": 7875,
+      "generated_offset": 23797,
       "length": 48
     },
     {
       "source": "parser.mbty",
-      "original_offset": 7806,
-      "generated_offset": 23414,
+      "original_offset": 7925,
+      "generated_offset": 23853,
       "length": 27
     },
     {
       "source": "parser.mbty",
-      "original_offset": 7841,
-      "generated_offset": 23481,
+      "original_offset": 7960,
+      "generated_offset": 23920,
       "length": 51
     },
     {
       "source": "parser.mbty",
-      "original_offset": 7894,
-      "generated_offset": 23540,
+      "original_offset": 8013,
+      "generated_offset": 23979,
       "length": 46
     },
     {
       "source": "parser.mbty",
-      "original_offset": 7942,
-      "generated_offset": 23594,
+      "original_offset": 8061,
+      "generated_offset": 24033,
+      "length": 21
+    },
+    {
+      "source": "parser.mbty",
+      "original_offset": 8086,
+      "generated_offset": 24076,
       "length": 10
     },
     {
       "source": "parser.mbty",
-      "original_offset": 19047,
-      "generated_offset": 24770,
+      "original_offset": 19311,
+      "generated_offset": 25252,
       "length": 31
     },
     {
       "source": "parser.mbty",
-      "original_offset": 19080,
-      "generated_offset": 24809,
+      "original_offset": 19344,
+      "generated_offset": 25291,
       "length": 40
     },
     {
       "source": "parser.mbty",
-      "original_offset": 19122,
-      "generated_offset": 24857,
+      "original_offset": 19386,
+      "generated_offset": 25339,
       "length": 17
     },
     {
       "source": "parser.mbty",
-      "original_offset": 19141,
-      "generated_offset": 24882,
+      "original_offset": 19405,
+      "generated_offset": 25364,
       "length": 39
     },
     {
       "source": "parser.mbty",
-      "original_offset": 19182,
-      "generated_offset": 24929,
+      "original_offset": 19446,
+      "generated_offset": 25411,
       "length": 21
     },
     {
       "source": "parser.mbty",
-      "original_offset": 19208,
-      "generated_offset": 24979,
+      "original_offset": 19472,
+      "generated_offset": 25461,
       "length": 17
     },
     {
       "source": "parser.mbty",
-      "original_offset": 19227,
-      "generated_offset": 25004,
+      "original_offset": 19491,
+      "generated_offset": 25486,
       "length": 41
     },
     {
       "source": "parser.mbty",
-      "original_offset": 7584,
-      "generated_offset": 26440,
+      "original_offset": 7703,
+      "generated_offset": 27121,
       "length": 47
     },
     {
       "source": "parser.mbty",
-      "original_offset": 7633,
-      "generated_offset": 26495,
+      "original_offset": 7752,
+      "generated_offset": 27176,
       "length": 37
     },
     {
       "source": "parser.mbty",
-      "original_offset": 7672,
-      "generated_offset": 26540,
+      "original_offset": 7791,
+      "generated_offset": 27221,
       "length": 82
     },
     {
       "source": "parser.mbty",
-      "original_offset": 7756,
-      "generated_offset": 26630,
+      "original_offset": 7875,
+      "generated_offset": 27311,
       "length": 48
     },
     {
       "source": "parser.mbty",
-      "original_offset": 7806,
-      "generated_offset": 26686,
+      "original_offset": 7925,
+      "generated_offset": 27367,
       "length": 27
     },
     {
       "source": "parser.mbty",
-      "original_offset": 7841,
-      "generated_offset": 26753,
+      "original_offset": 7960,
+      "generated_offset": 27434,
       "length": 51
     },
     {
       "source": "parser.mbty",
-      "original_offset": 7894,
-      "generated_offset": 26812,
+      "original_offset": 8013,
+      "generated_offset": 27493,
       "length": 46
     },
     {
       "source": "parser.mbty",
-      "original_offset": 7942,
-      "generated_offset": 26866,
+      "original_offset": 8061,
+      "generated_offset": 27547,
+      "length": 21
+    },
+    {
+      "source": "parser.mbty",
+      "original_offset": 8086,
+      "generated_offset": 27590,
       "length": 10
     },
     {
       "source": "parser.mbty",
-      "original_offset": 7584,
-      "generated_offset": 28273,
+      "original_offset": 7703,
+      "generated_offset": 29196,
       "length": 47
     },
     {
       "source": "parser.mbty",
-      "original_offset": 7633,
-      "generated_offset": 28328,
+      "original_offset": 7752,
+      "generated_offset": 29251,
       "length": 37
     },
     {
       "source": "parser.mbty",
-      "original_offset": 7672,
-      "generated_offset": 28373,
+      "original_offset": 7791,
+      "generated_offset": 29296,
       "length": 82
     },
     {
       "source": "parser.mbty",
-      "original_offset": 7756,
-      "generated_offset": 28463,
+      "original_offset": 7875,
+      "generated_offset": 29386,
       "length": 48
     },
     {
       "source": "parser.mbty",
-      "original_offset": 7806,
-      "generated_offset": 28519,
+      "original_offset": 7925,
+      "generated_offset": 29442,
       "length": 27
     },
     {
       "source": "parser.mbty",
-      "original_offset": 7841,
-      "generated_offset": 28586,
+      "original_offset": 7960,
+      "generated_offset": 29509,
       "length": 51
     },
     {
       "source": "parser.mbty",
-      "original_offset": 7894,
-      "generated_offset": 28645,
+      "original_offset": 8013,
+      "generated_offset": 29568,
       "length": 46
     },
     {
       "source": "parser.mbty",
-      "original_offset": 7942,
-      "generated_offset": 28699,
+      "original_offset": 8061,
+      "generated_offset": 29622,
+      "length": 21
+    },
+    {
+      "source": "parser.mbty",
+      "original_offset": 8086,
+      "generated_offset": 29665,
       "length": 10
     },
     {
       "source": "parser.mbty",
-      "original_offset": 7584,
-      "generated_offset": 30107,
+      "original_offset": 7703,
+      "generated_offset": 31272,
       "length": 47
     },
     {
       "source": "parser.mbty",
-      "original_offset": 7633,
-      "generated_offset": 30162,
+      "original_offset": 7752,
+      "generated_offset": 31327,
       "length": 37
     },
     {
       "source": "parser.mbty",
-      "original_offset": 7672,
-      "generated_offset": 30207,
+      "original_offset": 7791,
+      "generated_offset": 31372,
       "length": 82
     },
     {
       "source": "parser.mbty",
-      "original_offset": 7756,
-      "generated_offset": 30297,
+      "original_offset": 7875,
+      "generated_offset": 31462,
       "length": 48
     },
     {
       "source": "parser.mbty",
-      "original_offset": 7806,
-      "generated_offset": 30353,
+      "original_offset": 7925,
+      "generated_offset": 31518,
       "length": 27
     },
     {
       "source": "parser.mbty",
-      "original_offset": 7841,
-      "generated_offset": 30420,
+      "original_offset": 7960,
+      "generated_offset": 31585,
       "length": 51
     },
     {
       "source": "parser.mbty",
-      "original_offset": 7894,
-      "generated_offset": 30479,
+      "original_offset": 8013,
+      "generated_offset": 31644,
       "length": 46
     },
     {
       "source": "parser.mbty",
-      "original_offset": 7942,
-      "generated_offset": 30533,
+      "original_offset": 8061,
+      "generated_offset": 31698,
+      "length": 21
+    },
+    {
+      "source": "parser.mbty",
+      "original_offset": 8086,
+      "generated_offset": 31741,
       "length": 10
     },
     {
       "source": "parser.mbty",
-      "original_offset": 9744,
-      "generated_offset": 32025,
+      "original_offset": 9942,
+      "generated_offset": 33432,
       "length": 26
     },
     {
       "source": "parser.mbty",
-      "original_offset": 9772,
-      "generated_offset": 32059,
+      "original_offset": 9970,
+      "generated_offset": 33466,
       "length": 37
     },
     {
       "source": "parser.mbty",
-      "original_offset": 9812,
-      "generated_offset": 32105,
+      "original_offset": 10010,
+      "generated_offset": 33512,
       "length": 80
     },
     {
       "source": "parser.mbty",
-      "original_offset": 9894,
-      "generated_offset": 32193,
+      "original_offset": 10092,
+      "generated_offset": 33600,
       "length": 44
     },
     {
       "source": "parser.mbty",
-      "original_offset": 9940,
-      "generated_offset": 32245,
+      "original_offset": 10138,
+      "generated_offset": 33652,
       "length": 21
     },
     {
       "source": "parser.mbty",
-      "original_offset": 9963,
-      "generated_offset": 32274,
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       "source": "parser.mbty",
-      "original_offset": 28378,
-      "generated_offset": 654178,
+      "original_offset": 28642,
+      "generated_offset": 674424,
       "length": 2
     },
     {
       "source": "parser.mbty",
-      "original_offset": 50537,
-      "generated_offset": 654630,
+      "original_offset": 51382,
+      "generated_offset": 674876,
       "length": 19
     },
     {
       "source": "parser.mbty",
-      "original_offset": 50558,
-      "generated_offset": 654657,
+      "original_offset": 51403,
+      "generated_offset": 674903,
       "length": 31
     },
     {
       "source": "parser.mbty",
-      "original_offset": 50594,
-      "generated_offset": 654717,
+      "original_offset": 51439,
+      "generated_offset": 674963,
       "length": 4
     },
     {
       "source": "parser.mbty",
-      "original_offset": 50784,
-      "generated_offset": 655148,
+      "original_offset": 51629,
+      "generated_offset": 675394,
       "length": 33
     },
     {
       "source": "parser.mbty",
-      "original_offset": 50822,
-      "generated_offset": 655210,
+      "original_offset": 51667,
+      "generated_offset": 675456,
       "length": 3
     },
     {
       "source": "parser.mbty",
-      "original_offset": 50827,
-      "generated_offset": 655221,
+      "original_offset": 51672,
+      "generated_offset": 675467,
       "length": 2
     },
     {
       "source": "parser.mbty",
-      "original_offset": 50869,
-      "generated_offset": 655712,
+      "original_offset": 51714,
+      "generated_offset": 675958,
       "length": 30
     },
     {
       "source": "parser.mbty",
-      "original_offset": 50901,
-      "generated_offset": 655750,
+      "original_offset": 51746,
+      "generated_offset": 675996,
       "length": 15
     },
     {
       "source": "parser.mbty",
-      "original_offset": 50921,
-      "generated_offset": 655794,
+      "original_offset": 51766,
+      "generated_offset": 676040,
       "length": 5
     },
     {
       "source": "parser.mbty",
-      "original_offset": 50940,
-      "generated_offset": 656220,
+      "original_offset": 51785,
+      "generated_offset": 676466,
       "length": 31
     },
     {
       "source": "parser.mbty",
-      "original_offset": 50976,
-      "generated_offset": 656280,
+      "original_offset": 51821,
+      "generated_offset": 676526,
       "length": 3
     },
     {
       "source": "parser.mbty",
-      "original_offset": 50981,
-      "generated_offset": 656291,
+      "original_offset": 51826,
+      "generated_offset": 676537,
       "length": 2
     },
     {
       "source": "parser.mbty",
-      "original_offset": 51028,
-      "generated_offset": 656476,
+      "original_offset": 51873,
+      "generated_offset": 676722,
       "length": 12
     },
     {
       "source": "parser.mbty",
-      "original_offset": 51053,
-      "generated_offset": 656673,
+      "original_offset": 51898,
+      "generated_offset": 676919,
       "length": 13
     },
     {
       "source": "parser.mbty",
-      "original_offset": 51078,
-      "generated_offset": 656917,
+      "original_offset": 51923,
+      "generated_offset": 677163,
       "length": 6
     },
     {
       "source": "parser.mbty",
-      "original_offset": 51086,
-      "generated_offset": 656931,
+      "original_offset": 51931,
+      "generated_offset": 677177,
       "length": 2
     },
     {
       "source": "parser.mbty",
-      "original_offset": 51101,
-      "generated_offset": 657168,
+      "original_offset": 51946,
+      "generated_offset": 677414,
       "length": 7
     },
     {
       "source": "parser.mbty",
-      "original_offset": 51110,
-      "generated_offset": 657183,
+      "original_offset": 51955,
+      "generated_offset": 677429,
       "length": 2
     },
     {
       "source": "parser.mbty",
-      "original_offset": 51124,
-      "generated_offset": 657416,
+      "original_offset": 51969,
+      "generated_offset": 677662,
       "length": 6
     },
     {
       "source": "parser.mbty",
-      "original_offset": 51132,
-      "generated_offset": 657430,
+      "original_offset": 51977,
+      "generated_offset": 677676,
       "length": 2
     },
     {
       "source": "parser.mbty",
-      "original_offset": 51145,
-      "generated_offset": 657661,
+      "original_offset": 51990,
+      "generated_offset": 677907,
       "length": 10
     },
     {
       "source": "parser.mbty",
-      "original_offset": 51157,
-      "generated_offset": 657679,
+      "original_offset": 52002,
+      "generated_offset": 677925,
       "length": 2
     },
     {
       "source": "parser.mbty",
-      "original_offset": 51173,
-      "generated_offset": 657916,
+      "original_offset": 52018,
+      "generated_offset": 678162,
       "length": 13
     },
     {
       "source": "parser.mbty",
-      "original_offset": 51188,
-      "generated_offset": 657937,
+      "original_offset": 52033,
+      "generated_offset": 678183,
       "length": 2
     },
     {
       "source": "parser.mbty",
-      "original_offset": 51203,
-      "generated_offset": 658172,
+      "original_offset": 52048,
+      "generated_offset": 678418,
       "length": 12
     },
     {
       "source": "parser.mbty",
-      "original_offset": 51217,
-      "generated_offset": 658192,
+      "original_offset": 52062,
+      "generated_offset": 678438,
       "length": 2
     },
     {
       "source": "parser.mbty",
-      "original_offset": 51233,
-      "generated_offset": 658431,
+      "original_offset": 52078,
+      "generated_offset": 678677,
       "length": 8
     },
     {
       "source": "parser.mbty",
-      "original_offset": 51243,
-      "generated_offset": 658447,
+      "original_offset": 52088,
+      "generated_offset": 678693,
       "length": 2
     },
     {
       "source": "parser.mbty",
-      "original_offset": 50667,
-      "generated_offset": 658700,
+      "original_offset": 51512,
+      "generated_offset": 678946,
       "length": 8
     },
     {
       "source": "parser.mbty",
-      "original_offset": 50677,
-      "generated_offset": 658716,
+      "original_offset": 51522,
+      "generated_offset": 678962,
       "length": 2
     },
     {
       "source": "parser.mbty",
-      "original_offset": 50703,
-      "generated_offset": 659013,
+      "original_offset": 51548,
+      "generated_offset": 679259,
       "length": 26
     },
     {
       "source": "parser.mbty",
-      "original_offset": 50731,
-      "generated_offset": 659047,
+      "original_offset": 51576,
+      "generated_offset": 679293,
       "length": 5
     },
     {
       "source": "parser.mbty",
-      "original_offset": 3758,
-      "generated_offset": 659388,
+      "original_offset": 3877,
+      "generated_offset": 679634,
       "length": 1
     },
     {
       "source": "parser.mbty",
-      "original_offset": 3761,
-      "generated_offset": 659397,
+      "original_offset": 3880,
+      "generated_offset": 679643,
       "length": 5
     },
     {
       "source": "parser.mbty",
-      "original_offset": 3768,
-      "generated_offset": 659410,
+      "original_offset": 3887,
+      "generated_offset": 679656,
       "length": 2
     },
     {
       "source": "parser.mbty",
-      "original_offset": 3710,
-      "generated_offset": 659675,
+      "original_offset": 3829,
+      "generated_offset": 679921,
       "length": 17
     },
     {
       "source": "parser.mbty",
-      "original_offset": 3729,
-      "generated_offset": 659700,
+      "original_offset": 3848,
+      "generated_offset": 679946,
       "length": 2
     },
     {
       "source": "parser.mbty",
-      "original_offset": 31981,
-      "generated_offset": 659872,
+      "original_offset": 32245,
+      "generated_offset": 680118,
       "length": 5
     }
   ]
diff --git a/yacc_parser/parser.mbty b/yacc_parser/parser.mbty
index 73268597..27122b95 100644
--- a/yacc_parser/parser.mbty
+++ b/yacc_parser/parser.mbty
@@ -116,12 +116,17 @@
 %token ENUMVIEW "enumview"
 %token DECLARE         "declare"
 %token NORAISE "noraise"
+%token NOBREAK         "nobreak"
 %token WHERE           "where"
 %token TRY_QUESTION    "try?"
 %token TRY_EXCLAMATION "try!"
 %token LEXMATCH        "lexmatch"
 %token LEXMATCH_QUESTION "lexmatch?"
 
+// Note: this token is only used by `.mbti` parser
+%token PACKAGE         "package"
+
+
 %right BARBAR
 %right AMPERAMPER
 %left BAR
@@ -333,6 +338,7 @@ fun_header -> FunDecl
       vis: $2,
       doc: DocString::empty(),
       attrs: $1,
+      loc : mk_loc($loc)
     }
   }
   ;
@@ -354,6 +360,7 @@ declare_fun_header -> FunDecl
       vis: $3,
       doc: DocString::empty(),
       attrs: $1,
+      loc : mk_loc($loc)
     }
   }
 
@@ -367,7 +374,7 @@ local_type_decl -> LocalTypeDecl
     LocalTypeDecl::{
       tycon : $2,
       tycon_loc : mk_loc($loc($2)),
-      components: Record($4),
+      components: Record(fields = $4, constr_decl = None),
       deriving: $6
     }
   }
@@ -414,6 +421,7 @@ extern_fun_header -> (StringLiteral, FunDecl)
       vis: $2,
       doc: DocString::empty(),
       attrs: $1,
+      loc : mk_loc($loc)
     }
     ($4, fn_decl)
   }
@@ -547,14 +555,15 @@ structure_item -> Impl
       }
     )
   }
-  | struct_header "{" list_semis(record_decl_field) "}" deriving_directive_list {
+  | struct_header "{" record_decl_body "}" deriving_directive_list {
     let (attrs, type_vis, tycon, tycon_loc, params) = $1
+    let (fields, constr_decl) = $3
     TopTypeDef(
       TypeDecl::{
         tycon,
         tycon_loc,
         params,
-        components: Record($3),
+        components: Record(fields~, constr_decl~),
         type_vis,
         doc : DocString::empty(),
         deriving: $5,
@@ -1337,14 +1346,24 @@ lex_case -> LexCase :
     LexCase::{
       pat : $1,
       pat_loc : mk_loc($loc($1)),
+      guard_ : None,
       body : $3
     }
   }
+  | lex_pattern "if" infix_expr "=>" expr_statement {
+    LexCase::{
+      pat : $1,
+      pat_loc : mk_loc($loc($1)),
+      guard_ : Some($3),
+      body : $5
+    }
+  }
   | "..." {
     let pat = @list.singleton(LexTopPattern::Wildcard(loc = mk_loc($sloc)))
     LexCase::{
       pat,
       pat_loc : mk_loc($sloc),
+      guard_ : None,
       body : Hole(loc=mk_loc($sloc), kind=Todo)
     }
   }
@@ -1493,6 +1512,21 @@ simple_try_expr -> Expr
       loc = mk_loc($sloc)
     )
   }
+  | pipe_expr catch_keyword single_pattern_cases "}" else_keyword single_pattern_cases "}" {
+    let (catch_all, catch_loc) = $2
+    let else_loc = $5
+    Try(
+      body = $1,
+      catch_ = $3,
+      catch_all~,
+      try_else = Some($6),
+      has_try = false,
+      try_loc = mk_loc($loc($1)),
+      catch_loc~,
+      else_loc~,
+      loc = mk_loc($sloc)
+    )
+  }
   | pipe_expr { $1 }
   ;
 
@@ -2140,6 +2174,40 @@ record_decl_field -> FieldDecl
   }
   ;
 
+record_constr_decl -> FunDecl
+  : attributes is_async "fn" optional_type_parameters binder "(" list_commas(trait_method_param) ")" func_return_type {
+    let (return_type, error_type) = $9
+    FunDecl::{
+      type_name : None,
+      name : $5,
+      has_error : None,
+      is_async : $2,
+      quantifiers: $4,
+      decl_params: Some($7),
+      params_loc: mk_loc($loc($7)),
+      return_type,
+      error_type,
+      vis: Default,
+      doc: DocString::empty(),
+      attrs: $1,
+      loc : mk_loc($loc)
+    }
+  }
+
+record_decl_body -> (List[FieldDecl], FunDecl?)
+  : record_constr_decl option(SEMI) {
+    (@list.empty(), Some($1))
+  }
+  | {
+    (@list.empty(), None)
+  }
+  | non_empty_list_semi_rev_aux(record_decl_field) SEMI record_constr_decl option(SEMI) {
+    ($1.rev(), Some($3))
+  }
+  | non_empty_list_semi_rev_aux(record_decl_field) option(SEMI) {
+    ($1.rev(), None)
+  }
+
 constructor_param -> ConstrParam
   : option("mut") type_ { 
     ConstrParam::{