| // 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: |
| /// Right FutureOr: T1 is FutureOr<S1> and |
| /// either T0 <: Future<S1> |
| /// or T0 <: S1 |
| /// or T0 is X0 and X0 has bound S0 and S0 <: T1 |
| /// or T0 is X0 & S0 and S0 <: T1 |
| /// @description Check that if a type T1 is FutureOr<S1> and a type T0 is a |
| /// subtype of a type S1, then a type T0 is a subtype of a type T1. |
| /// @author ngl@unipro.ru |
| |
| import "dart:async"; |
| |
| class S1 { |
| const S1(); |
| } |
| class T0 extends S1 {} |
| |
| T0 t0Instance = new T0(); |
| FutureOr<S1> t1Instance = new Future.value(new S1()); |
| |
| const t1Default = const S1(); |
| |
| //# @T0 = T0 |
| //# @T1 = FutureOr<S1> |
