diff options
Diffstat (limited to 'compiler/typecheck/TcUnify.hs')
| -rw-r--r-- | compiler/typecheck/TcUnify.hs | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/compiler/typecheck/TcUnify.hs b/compiler/typecheck/TcUnify.hs index 3ca6aa3bfa..ca3347861b 100644 --- a/compiler/typecheck/TcUnify.hs +++ b/compiler/typecheck/TcUnify.hs @@ -381,8 +381,11 @@ matchExpectedTyConApp tc orig_ty -- because that'll make types that are utterly ill-kinded. -- This happened in Trac #7368 defer - = do { (_subst, args) <- tcInstBinders (tyConBinders tc) - ; co <- unifyType noThing (mkTyConApp tc args) orig_ty + = do { (_, arg_tvs) <- newMetaTyVars (tyConTyVars tc) + ; traceTc "mtca" (ppr tc $$ ppr (tyConTyVars tc) $$ ppr arg_tvs) + ; let args = mkTyVarTys arg_tvs + tc_template = mkTyConApp tc args + ; co <- unifyType noThing tc_template orig_ty ; return (co, args) } ---------------------- @@ -1458,7 +1461,7 @@ checkTauTvUpdate dflags origin t_or_k tv ty defer_me (TyVarTy tv') = tv == tv' || defer_me (tyVarKind tv') defer_me (TyConApp tc tys) = isTypeFamilyTyCon tc || any defer_me tys || not (impredicative || isTauTyCon tc) - defer_me (ForAllTy bndr t) = defer_me (binderType bndr) || defer_me t + defer_me (ForAllTy bndr t) = defer_me (binderKind bndr) || defer_me t || not impredicative defer_me (FunTy fun arg) = defer_me fun || defer_me arg defer_me (AppTy fun arg) = defer_me fun || defer_me arg |