X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=compiler%2Fmain%2FHeaderInfo.hs;h=c3c78ae59a3188168e5fcca76559ce90a2dd078a;hb=6a944ae7fe1e8e2e456c68717188463263f8978f;hp=926288440f36e6e9dd8b2367810a334226d43e93;hpb=63489d40bdee972656ff115ab2309b809c0e39fc;p=ghc-hetmet.git

diff --git a/compiler/main/HeaderInfo.hs b/compiler/main/HeaderInfo.hs
index 9262884..c3c78ae 100644
--- a/compiler/main/HeaderInfo.hs
+++ b/compiler/main/HeaderInfo.hs
@@ -237,13 +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