X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=compiler%2Frename%2FRnNames.lhs;h=803744957f28a0367961a5fab78cb497be3c4e89;hb=623e6139a5a3834bb1eb0582763c464549f7b918;hp=1052db68480412999232a51b8aae25de6a230e1b;hpb=651dd121a65827884eea23605026d16e26d4301c;p=ghc-hetmet.git

diff --git a/compiler/rename/RnNames.lhs b/compiler/rename/RnNames.lhs
index 1052db6..8037449 100644
--- a/compiler/rename/RnNames.lhs
+++ b/compiler/rename/RnNames.lhs
@@ -38,8 +38,8 @@ import FastString
 import ListSetOps
 import Data.List        ( partition, (\\), delete )
 import qualified Data.Set as Set
-import IO		( openFile, IOMode(..) )
-import Monad		( when, mplus )
+import System.IO
+import Control.Monad
 \end{code}
 
 
@@ -893,6 +893,7 @@ exports_from_avail (Just rdr_items) rdr_env imports this_mod
 
 	| otherwise
 	= do { implicit_prelude <- doptM Opt_ImplicitPrelude
+             ; warnDodgyExports <- doptM Opt_WarnDodgyExports
              ; let { exportValid = (mod `elem` imported_modules)
                             || (moduleName this_mod == mod)
                    ; gres = filter (isModuleExported implicit_prelude mod)
@@ -901,7 +902,7 @@ exports_from_avail (Just rdr_items) rdr_env imports this_mod
                    }
 
              ; checkErr exportValid (moduleNotImported mod)
-	     ; warnIf (exportValid && null gres) (nullModuleExport mod)
+	     ; warnIf (warnDodgyExports && exportValid && null gres) (nullModuleExport mod)
 
 	     ; addUsedRdrNames (concat [ [mkRdrQual mod occ, mkRdrUnqual occ]
                                        | occ <- map nameOccName names ])
@@ -955,12 +956,14 @@ exports_from_avail (Just rdr_items) rdr_env imports this_mod
                                 Nothing -> mkRdrUnqual
                                 Just (modName, _) -> mkRdrQual modName
              addUsedRdrNames $ map (mkKidRdrName . nameOccName) kids
-	     when (null kids)
-		  (if (isTyConName name) then addWarn (dodgyExportWarn name)
-				-- This occurs when you export T(..), but
-				-- only import T abstractly, or T is a synonym.  
-		   else addErr (exportItemErr ie))
-			
+             warnDodgyExports <- doptM Opt_WarnDodgyExports
+             when (null kids) $
+                  if isTyConName name
+                  then when warnDodgyExports $ addWarn (dodgyExportWarn name)
+                  else -- This occurs when you export T(..), but
+                       -- only import T abstractly, or T is a synonym.  
+                       addErr (exportItemErr ie)
+
              return (IEThingAll name, AvailTC name (name:kids))
 
     lookup_ie ie@(IEThingWith rdr sub_rdrs)
@@ -1472,11 +1475,11 @@ nullModuleExport mod
 moduleWarn :: ModuleName -> WarningTxt -> SDoc
 moduleWarn mod (WarningTxt txt)
   = sep [ ptext (sLit "Module") <+> quotes (ppr mod) <> ptext (sLit ":"), 
-          nest 4 (ppr txt) ]
+          nest 2 (vcat (map ppr txt)) ]
 moduleWarn mod (DeprecatedTxt txt)
   = sep [ ptext (sLit "Module") <+> quotes (ppr mod)
                                 <+> ptext (sLit "is deprecated:"), 
-          nest 4 (ppr txt) ]
+          nest 2 (vcat (map ppr txt)) ]
 
 implicitPreludeWarn :: SDoc
 implicitPreludeWarn