| // 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(FutureOr<T>) = |
| * let S be NORM(T) |
| * if S is a top type then S |
| * if S is Object then S |
| * if S is Object* then S |
| * if S is Never then Future<Never> |
| * if S is Null then Future<Null>? |
| * else FutureOr<S> |
| * |
| * @description Checks that if NORM(T) is Null then |
| * NORM(FutureOr<T>) = Future<Null>? |
| * |
| * @author sgrekhov@unipro.ru |
| */ |
| // Requirements=nnbd-strong |
| import 'dart:async'; |
| |
| class A<X> {} |
| class B<X> implements A<X> {} |
| |
| class C extends B<FutureOr<Null>> implements A<Future<Null>?> {} |
| |
| main() { |
| new C(); |
| } |
