checkMDo, -- [Stmt] -> P [Stmt]
checkValDef, -- (SrcLoc, HsExp, HsRhs, [HsDecl]) -> P HsDecl
checkValSig, -- (SrcLoc, HsExp, HsRhs, [HsDecl]) -> P HsDecl
+ checkDoAndIfThenElse,
parseError,
parseErrorSDoc,
) where
split (L _ (HsAppTy t u)) ts = split t (u : ts)
split (L l (HsTyVar tc)) ts = do data_con <- tyConToDataCon l tc
return (data_con, mk_rest ts)
- split (L l _) _ = parseError l "parse error in data/newtype declaration"
+ split (L l _) _ = parseErrorSDoc l (text "parse error in constructor in data/newtype declaration:" <+> ppr ty)
mk_rest [L _ (HsRecTy flds)] = RecCon flds
mk_rest ts = PrefixCon ts
checkValSig (L l (HsVar v)) ty
| isUnqual v && not (isDataOcc (rdrNameOcc v))
= return (TypeSig (L l v) ty)
-checkValSig lhs@(L l _) _
- | looks_like_foreign lhs
- = parseError l "Invalid type signature; perhaps you meant to use -XForeignFunctionInterface?"
- | otherwise
- = parseError l "Invalid type signature: should be of form <variable> :: <type>"
+checkValSig lhs@(L l _) ty
+ = parseErrorSDoc l ((text "Invalid type signature:" <+>
+ ppr lhs <+> text "::" <+> ppr ty)
+ $$ text hint)
where
+ hint = if looks_like_foreign lhs
+ then "Perhaps you meant to use -XForeignFunctionInterface?"
+ else "Should be of form <variable> :: <type>"
-- A common error is to forget the ForeignFunctionInterface flag
-- so check for that, and suggest. cf Trac #3805
-- Sadly 'foreign import' still barfs 'parse error' because 'import' is a keyword
looks_like_foreign _ = False
foreign_RDR = mkUnqual varName (fsLit "foreign")
+
+checkDoAndIfThenElse :: LHsExpr RdrName
+ -> Bool
+ -> LHsExpr RdrName
+ -> Bool
+ -> LHsExpr RdrName
+ -> P ()
+checkDoAndIfThenElse guardExpr semiThen thenExpr semiElse elseExpr
+ | semiThen || semiElse
+ = do pState <- getPState
+ unless (dopt Opt_DoAndIfThenElse (dflags pState)) $ do
+ parseErrorSDoc (combineLocs guardExpr elseExpr)
+ (text "Unexpected semi-colons in conditional:"
+ $$ nest 4 expr
+ $$ text "Perhaps you meant to use -XDoAndIfThenElse?")
+ | otherwise = return ()
+ where pprOptSemi True = semi
+ pprOptSemi False = empty
+ expr = text "if" <+> ppr guardExpr <> pprOptSemi semiThen <+>
+ text "then" <+> ppr thenExpr <> pprOptSemi semiElse <+>
+ text "else" <+> ppr elseExpr
\end{code}