diff options
Diffstat (limited to 'compiler/GHC/Rename/Bind.hs')
| -rw-r--r-- | compiler/GHC/Rename/Bind.hs | 15 |
1 files changed, 10 insertions, 5 deletions
diff --git a/compiler/GHC/Rename/Bind.hs b/compiler/GHC/Rename/Bind.hs index a2566220b6..bb4a3c1b76 100644 --- a/compiler/GHC/Rename/Bind.hs +++ b/compiler/GHC/Rename/Bind.hs @@ -955,7 +955,7 @@ renameSig _ (IdSig _ x) renameSig ctxt sig@(TypeSig _ vs ty) = do { new_vs <- mapM (lookupSigOccRn ctxt sig) vs ; let doc = TypeSigCtx (ppr_sig_bndrs vs) - ; (new_ty, fvs) <- rnHsSigWcType doc ty + ; (new_ty, fvs) <- rnHsSigWcType doc Nothing ty ; return (TypeSig noExtField new_vs new_ty, fvs) } renameSig ctxt sig@(ClassOpSig _ is_deflt vs ty) @@ -963,16 +963,21 @@ renameSig ctxt sig@(ClassOpSig _ is_deflt vs ty) ; when (is_deflt && not defaultSigs_on) $ addErr (defaultSigErr sig) ; new_v <- mapM (lookupSigOccRn ctxt sig) vs - ; (new_ty, fvs) <- rnHsSigType ty_ctxt TypeLevel ty + ; (new_ty, fvs) <- rnHsSigType ty_ctxt TypeLevel inf_msg ty ; return (ClassOpSig noExtField is_deflt new_v new_ty, fvs) } where (v1:_) = vs ty_ctxt = GenericCtx (text "a class method signature for" <+> quotes (ppr v1)) + inf_msg = if is_deflt + then Just (text "A default type signature cannot contain inferred type variables") + else Nothing renameSig _ (SpecInstSig _ src ty) - = do { (new_ty, fvs) <- rnHsSigType SpecInstSigCtx TypeLevel ty + = do { (new_ty, fvs) <- rnHsSigType SpecInstSigCtx TypeLevel inf_msg ty ; return (SpecInstSig noExtField src new_ty,fvs) } + where + inf_msg = Just (text "Inferred type variables are not allowed") -- {-# SPECIALISE #-} pragmas can refer to imported Ids -- so, in the top-level case (when mb_names is Nothing) @@ -988,7 +993,7 @@ renameSig ctxt sig@(SpecSig _ v tys inl) ty_ctxt = GenericCtx (text "a SPECIALISE signature for" <+> quotes (ppr v)) do_one (tys,fvs) ty - = do { (new_ty, fvs_ty) <- rnHsSigType ty_ctxt TypeLevel ty + = do { (new_ty, fvs_ty) <- rnHsSigType ty_ctxt TypeLevel Nothing ty ; return ( new_ty:tys, fvs_ty `plusFV` fvs) } renameSig ctxt sig@(InlineSig _ v s) @@ -1005,7 +1010,7 @@ renameSig ctxt sig@(MinimalSig _ s (L l bf)) renameSig ctxt sig@(PatSynSig _ vs ty) = do { new_vs <- mapM (lookupSigOccRn ctxt sig) vs - ; (ty', fvs) <- rnHsSigType ty_ctxt TypeLevel ty + ; (ty', fvs) <- rnHsSigType ty_ctxt TypeLevel Nothing ty ; return (PatSynSig noExtField new_vs ty', fvs) } where ty_ctxt = GenericCtx (text "a pattern synonym signature for" |