src: drop unused DeriveDataTypeable

src/GHCMod.hs

@@ -48,7 +48,7 @@ optionUsage :: (String -> String) -> [OptDescr a] -> [String]
 optionUsage indent opts = concatMap optUsage opts
  where
    optUsage (Option so lo dsc udsc) =
-       [ concat $ intersperse ", " $ addLabel `map` allFlags
+       [ intercalate ", " $ addLabel `map` allFlags
        , indent $ udsc
        , ""
        ]

src/GHCModi.hs

@@ -1,4 +1,4 @@
-{-# LANGUAGE ScopedTypeVariables, DeriveDataTypeable #-}
+{-# LANGUAGE ScopedTypeVariables #-}
 
 -- | WARNING
 -- This program is deprecated, use `ghc-mod legacy-interactive` instead.

src/Misc.hs

@@ -1,4 +1,4 @@
-{-# LANGUAGE DeriveDataTypeable, CPP #-}
+{-# LANGUAGE CPP #-}
 
 module Misc (
     SymDbReq