rnFamily (tydecl@TyFamily {tcdFlavour = flavour,
tcdLName = tycon, tcdTyVars = tyvars})
bindIdxVars =
- do { checkM (isDataFlavour flavour -- for synonyms,
- || not (null tyvars)) $ addErr needOneIdx -- no. of indexes >= 1
- ; bindIdxVars (family_doc tycon) tyvars $ \tyvars' -> do {
+ do { bindIdxVars (family_doc tycon) tyvars $ \tyvars' -> do {
; tycon' <- lookupLocatedTopBndrRn tycon
; return (TyFamily {tcdFlavour = flavour, tcdLName = tycon',
tcdTyVars = tyvars', tcdKind = tcdKind tydecl},
emptyFVs)
} }
- where
- isDataFlavour DataFamily = True
- isDataFlavour _ = False
rnFamily d _ = pprPanic "rnFamily" (ppr d)
family_doc :: Located RdrName -> SDoc
family_doc tycon = text "In the family declaration for" <+> quotes (ppr tycon)
-needOneIdx :: SDoc
-needOneIdx = text "Type family declarations requires at least one type index"
-
-- Rename associated type declarations (in classes)
--
-- * This can be family declarations and (default) type instances
; idx_tys <- doptM Opt_TypeFamilies
; checkTc idx_tys $ badFamInstDecl tc_name
- -- Check for no type indices
- ; checkTc (not (null tvs)) (noIndexTypes tc_name)
-
; tycon <- buildSynTyCon tc_name tvs' (OpenSynTyCon kind Nothing) kind Nothing
; return [ATyCon tycon]
}
; idx_tys <- doptM Opt_TypeFamilies
; checkTc idx_tys $ badFamInstDecl tc_name
- -- Check for no type indices
- ; checkTc (not (null tvs)) (noIndexTypes tc_name)
-
; tycon <- buildAlgTyCon tc_name final_tvs []
mkOpenDataTyConRhs Recursive False True Nothing
; return [ATyCon tycon]
quotes (ppr tc_name)
, nest 2 (parens $ ptext (sLit "Use -XKindSignatures to allow kind signatures")) ]
-noIndexTypes :: Name -> SDoc
-noIndexTypes tc_name
- = ptext (sLit "Type family constructor") <+> quotes (ppr tc_name)
- <+> ptext (sLit "must have at least one type index parameter")
-
badFamInstDecl :: Outputable a => a -> SDoc
badFamInstDecl tc_name
= vcat [ ptext (sLit "Illegal family instance for") <+>