| // Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| /** |
| * @assertion |
| * NORM(T?) = |
| * let S be NORM(T) |
| * if S is a top type then S |
| * if S is Never then Null |
| * if S is Never* then Null |
| * if S is Null then Null |
| * if S is FutureOr<R> and R is nullable then S |
| * if S is FutureOr<R>* and R is nullable then FutureOr<R> |
| * if S is R? then R? |
| * if S is R* then R? |
| * else S? |
| * |
| * @description Checks that if NORM(T) is FutureOr<R> and R is not nullable then |
| * NORM(T?) != FutureOr<R> |
| * |
| * @author sgrekhov@unipro.ru |
| */ |
| |
| import 'dart:async'; |
| class A<X> {} |
| class B1<X> implements A<X> {} |
| |
| class C1 extends B1<FutureOr<String>?> implements A<FutureOr<String>> {} |
| // ^^ |
| // [analyzer]unspecified |
| // [cfe] unspecified |
| main() { |
| new C1(); |
| } |
