| /* |
| * 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 S1 and a type T0 is X0 and X0 has |
| * bound S0 and S0 <: S1, then a type T0 is a subtype of a type T1. |
| * @author ngl@unipro.ru |
| */ |
| import "dart:async"; |
| |
| class S1 {} |
| class S0 extends S1 { |
| } |
| class X0 extends S0 { |
| } |
| |
| X0 t0Instance = new X0(); |
| FutureOr<S1> t1Instance = new S1(); |
| |
| //# @T0 = X0 |
| //# @T1 = FutureOr<S1> |
