diff --git a/compiler/rustc_ast/src/ptr.rs b/compiler/rustc_ast/src/ptr.rs
index 0140fb752bf92..6cc6d3526d65c 100644
--- a/compiler/rustc_ast/src/ptr.rs
+++ b/compiler/rustc_ast/src/ptr.rs
@@ -28,7 +28,8 @@ use std::{slice, vec};
 use rustc_serialize::{Decodable, Decoder, Encodable, Encoder};
 
 use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
-/// An owned smart pointer.
+
+/// An owned smart pointer. 
 pub struct P<T: ?Sized> {
     ptr: Box<T>,
 }
diff --git a/library/core/src/str/mod.rs b/library/core/src/str/mod.rs
index 27178328be5c1..7357205ca052d 100644
--- a/library/core/src/str/mod.rs
+++ b/library/core/src/str/mod.rs
@@ -119,7 +119,7 @@ fn slice_error_fail_rt(s: &str, begin: usize, end: usize) -> ! {
     // 2. begin <= end
     assert!(
         begin <= end,
-        "begin <= end ({} <= {}) when slicing `{}`{}",
+        "begin should be <= end ({} is not <= {}) when slicing `{}`{}",
         begin,
         end,
         s_trunc,