X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=compiler%2Fmain%2FHeaderInfo.hs;h=c3c78ae59a3188168e5fcca76559ce90a2dd078a;hb=6a944ae7fe1e8e2e456c68717188463263f8978f;hp=0fd62f5a68f3cb26bda4389ccf2ad39018937fa6;hpb=56f147d470b4ea26dd279554eb71cf419579bce4;p=ghc-hetmet.git

diff --git a/compiler/main/HeaderInfo.hs b/compiler/main/HeaderInfo.hs
index 0fd62f5..c3c78ae 100644
--- a/compiler/main/HeaderInfo.hs
+++ b/compiler/main/HeaderInfo.hs
@@ -59,13 +59,16 @@ getImports dflags buf filename source_filename = do
   case unP parseHeader (mkPState buf loc dflags) of
     PFailed span err -> parseError span err
     POk pst rdr_module -> do
-      let ms@(warns, errs) = getMessages pst
-      logWarnings warns
+      let _ms@(_warns, errs) = getMessages pst
+      -- don't log warnings: they'll be reported when we parse the file
+      -- for real.  See #2500.
+          ms = (emptyBag, errs)
+      -- logWarnings warns
       if errorsFound dflags ms
         then liftIO $ throwIO $ mkSrcErr errs
         else
 	  case rdr_module of
-	    L _ (HsModule mb_mod _ imps _ _ _ _) ->
+	    L _ (HsModule mb_mod _ imps _ _ _) ->
 	      let
                 main_loc = mkSrcLoc (mkFastString source_filename) 1 0
 		mod = mb_mod `orElse` L (srcLocSpan main_loc) mAIN_NAME
@@ -234,13 +237,16 @@ languagePragParseError :: SrcSpan -> a
 languagePragParseError loc =
   throw $ mkSrcErr $ unitBag $
      (mkPlainErrMsg loc $
-       text "cannot parse LANGUAGE pragma: comma-separated list expected")
+       vcat [ text "Cannot parse LANGUAGE pragma"
+            , text "Expecting comma-separated list of language options,"
+            , text "each starting with a capital letter"
+            , nest 2 (text "E.g. {-# LANGUAGE RecordPuns, Generics #-}") ])
 
 unsupportedExtnError :: SrcSpan -> String -> a
 unsupportedExtnError loc unsup =
   throw $ mkSrcErr $ unitBag $
     mkPlainErrMsg loc $
-        text "unsupported extension: " <> text unsup
+        text "Unsupported extension: " <> text unsup
 
 
 optionsErrorMsgs :: [String] -> [Located String] -> FilePath -> Messages