- = do { arg_names <- newIfaceNames (map mkVarOccFS arg_strs)
- ; let (tyvar_strs, id_strs) = splitAtList (dataConTyVars con) arg_strs
- ; tyvar_names <- mapM (newIfaceName . mkTyVarOcc) tyvar_strs
- ; id_names <- mapM (newIfaceName . mkVarOccFS) id_strs
- ; let ex_tvs = [ mkTyVar name (tyVarKind tv)
- | (name,tv) <- tyvar_names `zip` dataConExTyVars con ]
- arg_tys = dataConInstArgTys con (inst_tys ++ mkTyVarTys ex_tvs)
- arg_ids = ASSERT2( equalLength id_names arg_tys,
- ppr (con, tyvar_names++id_names, rhs) $$ ppr ex_tvs $$ ppr arg_tys )
- zipWith mkLocalId id_names arg_tys
-
- ; rhs' <- extendIfaceTyVarEnv ex_tvs $
+ = do { us <- newUniqueSupply
+ ; let uniqs = uniqsFromSupply us
+ ; let (ex_tvs, co_tvs, arg_ids)
+ = dataConRepFSInstPat arg_strs uniqs con inst_tys
+ all_tvs = ex_tvs ++ co_tvs
+
+ ; rhs' <- extendIfaceTyVarEnv all_tvs $