DNCallSpec(..), DNKind(..), CLabelString )
import OccName ( srcDataName, varName, isDataOcc, isTcOcc,
occNameString )
+import PrelNames ( forall_tv_RDR )
import SrcLoc
import OrdList ( OrdList, fromOL )
import Bag ( Bag, emptyBag, snocBag, consBag, foldrBag )
| isTcOcc (rdrNameOcc tc)
= return (L loc (setRdrNameSpace tc srcDataName))
| otherwise
- = parseError loc (showSDoc (text "Not a constructor:" <+> quotes (ppr tc)))
+ = parseErrorSDoc loc (msg $$ extra)
+ where
+ msg = text "Not a data constructor:" <+> quotes (ppr tc)
+ extra | tc == forall_tv_RDR
+ = text "Perhaps you intended to use -XExistentialQuantification"
+ | otherwise = empty
----------------------------------------------------------------------------
-- Various Syntactic Checks
extractTyVars :: [LHsType RdrName] -> P [LHsTyVarBndr RdrName]
extractTyVars tvs = collects tvs []
where
- -- Collect all variables (1st arg serves as an accumulator)
+ -- Collect all variables (2nd arg serves as an accumulator)
+ collect :: LHsType RdrName -> [LHsTyVarBndr RdrName]
+ -> P [LHsTyVarBndr RdrName]
collect (L l (HsForAllTy _ _ _ _)) =
const $ parseError l "Forall type not allowed as type parameter"
collect (L l (HsTyVar tv))
-> P (HsBind RdrName)
checkFunBind lhs_loc fun is_infix pats opt_sig (L rhs_span grhss)
| isQual (unLoc fun)
- = parseError (getLoc fun) ("Qualified name in function definition: " ++
- showRdrName (unLoc fun))
+ = parseErrorSDoc (getLoc fun)
+ (ptext SLIT("Qualified name in function definition:") <+> ppr (unLoc fun))
| otherwise
= do ps <- checkPatterns pats
let match_span = combineSrcSpans lhs_loc rhs_span
parse2 _ _ [] = d'oh
parse2 isStatic kind (('[':x):xs) =
case x of
+ [] -> d'oh
vs | last vs == ']' -> parse3 isStatic kind (init vs) xs
_ -> d'oh
parse2 isStatic kind xs = parse3 isStatic kind "" xs
showRdrName r = showSDoc (ppr r)
parseError :: SrcSpan -> String -> P a
-parseError span s = failSpanMsgP span s
+parseError span s = parseErrorSDoc span (text s)
+
+parseErrorSDoc :: SrcSpan -> SDoc -> P a
+parseErrorSDoc span s = failSpanMsgP span s
\end{code}