Remove unused showsPrecSDoc

compiler/utils/Outputable.lhs

@@ -45,7 +45,7 @@ module Outputable (
         showSDoc, showSDocOneLine,
         showSDocForUser, showSDocDebug, showSDocDump, showSDocDumpOneLine,
         showPpr,
-        showSDocUnqual, showsPrecSDoc,
+        showSDocUnqual,
         renderWithStyle,
 
         pprInfixVar, pprPrefixVar,
@@ -385,9 +385,6 @@ showSDocUnqual :: DynFlags -> SDoc -> String
 showSDocUnqual _ d
  = show (runSDoc d (initSDocContext (mkUserStyle neverQualify AllTheWay)))
 
-showsPrecSDoc :: Int -> SDoc -> ShowS
-showsPrecSDoc p d = showsPrec p (runSDoc d (initSDocContext defaultUserStyle))
-
 showSDocDump :: DynFlags -> SDoc -> String
 showSDocDump _ d
  = Pretty.showDocWith PageMode (runSDoc d (initSDocContext defaultDumpStyle))