X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=compiler%2Fmain%2FHeaderInfo.hs;h=d21eeac860f3b6a7a6d06e70575dbd4b5e82abad;hb=0e6ff027979263c36703f26da836a784fe1606a2;hp=e16c2ce562b07e7b25acd3b274ad06cefe5165b5;hpb=4917397e279b0aa755eb09e1ca62913237132895;p=ghc-hetmet.git

diff --git a/compiler/main/HeaderInfo.hs b/compiler/main/HeaderInfo.hs
index e16c2ce..d21eeac 100644
--- a/compiler/main/HeaderInfo.hs
+++ b/compiler/main/HeaderInfo.hs
@@ -57,7 +57,7 @@ getImports :: GhcMonad m =>
               -- ^ The source imports, normal imports, and the module name.
 getImports dflags buf filename source_filename = do
   let loc  = mkSrcLoc (mkFastString filename) 1 1
-  case unP parseHeader (mkPState buf loc dflags) of
+  case unP parseHeader (mkPState dflags buf loc) of
     PFailed span err -> parseError span err
     POk pst rdr_module -> do
       let _ms@(_warns, errs) = getMessages pst
@@ -228,6 +228,9 @@ getOptions' toks
           parseToks (open:xs)
               | ITlanguage_prag <- getToken open
               = parseLanguage xs
+          parseToks (x:xs)
+              | ITdocCommentNext _ <- getToken x
+              = parseToks xs
           parseToks _ = []
           parseLanguage (L loc (ITconid fs):rest)
               = checkExtension (L loc fs) :
@@ -263,8 +266,7 @@ checkExtension (L l ext)
 -- Checks if a given extension is valid, and if so returns
 -- its corresponding flag. Otherwise it throws an exception.
  =  let ext' = unpackFS ext in
-    if ext' `elem` supportedLanguages
-       || ext' `elem` (map ("No"++) supportedLanguages)
+    if ext' `elem` supportedLanguagesAndExtensions
     then L l ("-X"++ext')
     else unsupportedExtnError l ext'
 
@@ -281,7 +283,9 @@ unsupportedExtnError :: SrcSpan -> String -> a
 unsupportedExtnError loc unsup =
   throw $ mkSrcErr $ unitBag $
     mkPlainErrMsg loc $
-        text "Unsupported extension: " <> text unsup
+        text "Unsupported extension: " <> text unsup $$
+        if null suggestions then empty else text "Perhaps you meant" <+> quotedListWithOr (map text suggestions)
+  where suggestions = fuzzyMatch unsup supportedLanguagesAndExtensions
 
 
 optionsErrorMsgs :: [String] -> [Located String] -> FilePath -> Messages