Remove redudant import warning (#651)

haddock-api/src/Haddock/Interface.hs

@@ -49,20 +49,21 @@ import qualified Data.Set as Set
 import Distribution.Verbosity
 import System.Directory
 import System.FilePath
-import System.IO
 import Text.Printf
 
 import Digraph
 import DynFlags hiding (verbosity)
 import Exception
 import GHC hiding (verbosity)
+import HscTypes
+import FastString (unpackFS)
+import MonadUtils (liftIO)
+
 #if defined(mingw32_HOST_OS)
+import System.IO
 import GHC.IO.Encoding.CodePage (mkLocaleEncoding)
 import GHC.IO.Encoding.Failure (CodingFailureMode(TransliterateCodingFailure))
 #endif
-import HscTypes
-import FastString (unpackFS)
-import MonadUtils (liftIO)
 
 -- | Create 'Interface's and a link environment by typechecking the list of
 -- modules using the GHC API and processing the resulting syntax trees.