; return (TypeSig new_v new_ty) }
renameSig mb_names sig@(GenericSig v ty)
- = do { new_v <- lookupSigOccRn mb_names sig v
+ = do { generics_on <- xoptM Opt_Generics
+ ; unless generics_on (addErr (genericSigErr sig))
+ ; new_v <- lookupSigOccRn mb_names sig v
; new_ty <- rnHsSigType (quotes (ppr v)) ty
; return (GenericSig new_v new_ty) } -- JPM: ?
= addErrAt loc $
sep [ptext (sLit "Misplaced") <+> hsSigDoc sig <> colon, ppr sig]
+genericSigErr :: Sig RdrName -> SDoc
+genericSigErr sig = vcat [ hang (ptext (sLit "Unexpected generic default signature:"))
+ 2 (ppr sig)
+ , ptext (sLit "Use -XGenerics to enable generic default signatures") ]
+
methodBindErr :: HsBindLR RdrName RdrName -> SDoc
methodBindErr mbind
= hang (ptext (sLit "Pattern bindings (except simple variables) not allowed in instance declarations"))
nonStdGuardErr guards
= hang (ptext (sLit "accepting non-standard pattern guards (use -XPatternGuards to suppress this message)"))
4 (interpp'SP guards)
+
\end{code}