| // Copyright (c) 2018, 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 We say that a type T0 is a subtype of a type T1 (written T0 <: T1) |
| /// when: |
| /// Left FutureOr: T0 is FutureOr<S0> |
| /// and Future<S0> <: T1 |
| /// and S0 <: T1 |
| /// @description Check that if a type T0 is FutureOr<S0> and Future<S0> and S0 |
| /// are subtypes of a type T1, then a type T0 is a subtype of a type T1. Case |
| /// when an instance of T0 is an instance of S0 type. |
| /// @author ngl@unipro.ru |
| |
| import "dart:async"; |
| |
| class C { |
| const C(); |
| } |
| class S0 extends C {} |
| |
| FutureOr<S0> t0Instance = new S0(); |
| FutureOr<C> t1Instance = new Future<C>.value(new C()); |
| |
| const t1Default = const C(); |
| |
| //# @T0 = FutureOr<S0> |
| //# @T1 = FutureOr<C> |
