kc_con_details (RecCon fields)
= do { fields' <- mappM kc_field fields; return (RecCon fields') }
- kc_field (HsRecField fld bty d) = do { bty' <- kc_larg_ty bty ; return (HsRecField fld bty' d) }
+ kc_field (ConDeclField fld bty d) = do { bty' <- kc_larg_ty bty
+ ; return (ConDeclField fld bty' d) }
kc_larg_ty bty = case new_or_data of
DataType -> kcHsSigType bty
; want_generic <- doptM Opt_Generics
; unbox_strict <- doptM Opt_UnboxStrictFields
; gla_exts <- doptM Opt_GlasgowExts
+ ; gadt_ok <- doptM Opt_GADTs
; is_boot <- tcIsHsBoot -- Are we compiling an hs-boot file?
-- Check that we don't use GADT syntax in H98 world
- ; checkTc (gla_exts || h98_syntax) (badGadtDecl tc_name)
+ ; checkTc (gadt_ok || h98_syntax) (badGadtDecl tc_name)
-- Check that we don't use kind signatures without Glasgow extensions
; checkTc (gla_exts || isNothing mb_ksig) (badSigTyDecl tc_name)
InfixCon bty1 bty2 -> tc_datacon True [] [bty1,bty2]
RecCon fields -> tc_datacon False field_names btys
where
- (field_names, btys) = unzip [ (n, t) | HsRecField n t _ <- fields ]
-
+ field_names = map cd_fld_name fields
+ btys = map cd_fld_type fields
}
tcResultType :: TyCon
-- Return type is (T a b c)
; checkTc (null ex_tvs && null theta) (newtypeExError con)
-- No existentials
+ ; checkTc (not (any isMarkedStrict (dataConStrictMarks con)))
+ (newtypeStrictError con)
+ -- No strictness
}
where
(_univ_tvs, ex_tvs, eq_spec, theta, arg_tys, _res_ty) = dataConFullSig con
badGadtDecl tc_name
= vcat [ ptext SLIT("Illegal generalised algebraic data declaration for") <+> quotes (ppr tc_name)
- , nest 2 (parens $ ptext SLIT("Use -fglasgow-exts to allow GADTs")) ]
+ , nest 2 (parens $ ptext SLIT("Use -X=GADT to allow GADTs")) ]
badStupidTheta tc_name
= ptext SLIT("A data type declared in GADT style cannot have a context:") <+> quotes (ppr tc_name)
= sep [ptext SLIT("A newtype constructor cannot have an existential context,"),
nest 2 $ ptext SLIT("but") <+> quotes (ppr con) <+> ptext SLIT("does")]
+newtypeStrictError con
+ = sep [ptext SLIT("A newtype constructor cannot have a strictness annotation,"),
+ nest 2 $ ptext SLIT("but") <+> quotes (ppr con) <+> ptext SLIT("does")]
+
newtypePredError con
= sep [ptext SLIT("A newtype constructor must have a return type of form T a1 ... an"),
nest 2 $ ptext SLIT("but") <+> quotes (ppr con) <+> ptext SLIT("does not")]
badFamInstDecl tc_name
= vcat [ ptext SLIT("Illegal family instance for") <+>
quotes (ppr tc_name)
- , nest 2 (parens $ ptext SLIT("Use -ftype-families to allow indexed type families")) ]
+ , nest 2 (parens $ ptext SLIT("Use -X=TypeFamilies to allow indexed type families")) ]
badGadtIdxTyDecl tc_name
= vcat [ ptext SLIT("Illegal generalised algebraic data declaration for") <+>