lineSeparator are only used in toList/toPlain.

Language/Haskell/GhcMod/Lint.hs

@@ -2,7 +2,6 @@ module Language.Haskell.GhcMod.Lint where
 
 import Control.Applicative ((<$>))
 import Language.Haskell.GhcMod.Types
-import Language.Haskell.GhcMod.Utils (replace)
 import Language.Haskell.HLint (hlint)
 
 -- | Checking syntax of a target file using hlint.
@@ -12,6 +11,5 @@ lintSyntax :: Options
            -> IO String
 lintSyntax opt file = pack <$> hlint (file : "--quiet" : hopts)
   where
-    LineSeparator lsep = lineSeparator opt
-    pack = convert opt . map (replace '\n' lsep . init . show)
+    pack = convert opt . map (init . show) -- init drops the last \n.
     hopts = hlintOpts opt