HLint: use == and redundant maybe

.hlint.yaml

@@ -2,7 +2,7 @@
 - ignore: {name: "Avoid NonEmpty.unzip"} # 1 hint
 - ignore: {name: "Avoid lambda"} # 50 hints
 - ignore: {name: "Avoid lambda using `infix`"} # 23 hints
-- ignore: {name: "Eta reduce"} # 136 hints
+- ignore: {name: "Eta reduce"} # 137 hints
 - ignore: {name: "Evaluate"} # 10 hints
 - ignore: {name: "Functor law"} # 10 hints
 - ignore: {name: "Fuse concatMap/map"} # 3 hints
@@ -19,27 +19,25 @@
 - ignore: {name: "Redundant guard"} # 2 hints
 - ignore: {name: "Redundant if"} # 6 hints
 - ignore: {name: "Redundant lambda"} # 19 hints
-- ignore: {name: "Redundant maybe"} # 2 hints
 - ignore: {name: "Redundant multi-way if"} # 1 hint
-- ignore: {name: "Redundant return"} # 10 hints
+- ignore: {name: "Redundant return"} # 9 hints
 - ignore: {name: "Replace case with fromMaybe"} # 4 hints
 - ignore: {name: "Replace case with maybe"} # 10 hints
 - ignore: {name: "Use $>"} # 5 hints
 - ignore: {name: "Use ++"} # 4 hints
-- ignore: {name: "Use :"} # 28 hints
+- ignore: {name: "Use :"} # 29 hints
 - ignore: {name: "Use <$"} # 2 hints
-- ignore: {name: "Use <$>"} # 87 hints
+- ignore: {name: "Use <$>"} # 86 hints
 - ignore: {name: "Use <&>"} # 16 hints
 - ignore: {name: "Use <=<"} # 4 hints
 - ignore: {name: "Use =<<"} # 7 hints
-- ignore: {name: "Use =="} # 2 hints
 - ignore: {name: "Use >=>"} # 3 hints
 - ignore: {name: "Use Down"} # 3 hints
 - ignore: {name: "Use bimap"} # 7 hints
 - ignore: {name: "Use camelCase"} # 96 hints
 - ignore: {name: "Use catMaybes"} # 4 hints
 - ignore: {name: "Use concatMap"} # 2 hints
-- ignore: {name: "Use const"} # 37 hints
+- ignore: {name: "Use const"} # 36 hints
 - ignore: {name: "Use fmap"} # 23 hints
 - ignore: {name: "Use fold"} # 1 hint
 - ignore: {name: "Use fromMaybe"} # 5 hints

Cabal/src/Distribution/Simple/Configure.hs

@@ -2816,7 +2816,7 @@ checkRelocatable verbosity pkg lbi =
 
     -- Check if the Compiler support relocatable builds
     checkCompiler =
-      unless (compilerFlavor comp `elem` [GHC]) $
+      unless (compilerFlavor comp == GHC) $
         dieWithException verbosity $
           NoCompilerSupport (show comp)
       where
@@ -2857,7 +2857,7 @@ checkRelocatable verbosity pkg lbi =
       traverse_ (doCheck $ getSymbolicPath pkgr) ipkgs
       where
         doCheck pkgr ipkg
-          | maybe False (== pkgr) (IPI.pkgRoot ipkg) =
+          | Just pkgr == IPI.pkgRoot ipkg =
               for_ (IPI.libraryDirs ipkg) $ \libdir -> do
                 -- When @prefix@ is not under @pkgroot@,
                 -- @shortRelativePath prefix pkgroot@ will return a path with

Cabal/src/Distribution/Simple/SrcDist.hs

@@ -512,10 +512,7 @@ createArchive verbosity pkg_descr tmpDir targetPref = do
   let tarBallFilePath = targetPref </> tarBallName pkg_descr <.> "tar.gz"
   (tarProg, _) <- requireProgram verbosity tarProgram defaultProgramDb
   let formatOptSupported =
-        maybe False (== "YES") $
-          Map.lookup
-            "Supports --format"
-            (programProperties tarProg)
+        Just "YES" == Map.lookup "Supports --format" (programProperties tarProg)
   runProgram verbosity tarProg $
     -- Hmm: I could well be skating on thinner ice here by using the -C option
     -- (=> seems to be supported at least by GNU and *BSD tar) [The

cabal-install/src/Distribution/Client/Init/Types.hs

@@ -501,7 +501,7 @@ checkInvalidPath :: String -> a -> PurePrompt a
 checkInvalidPath path act =
   -- The check below is done this way so it's easier to append
   -- more invalid paths in the future, if necessary
-  if path `elem` ["."]
+  if path == "."
     then throwPrompt $ BreakException $ "Invalid path: " ++ path
     else return act