| // 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 We say that a type T0 is a subtype of a type T1 (written T0 <: T1) |
| * when: |
| * Right Promoted Variable: if T1 is a promoted type variable X1 & S1 then: |
| * - T0 <: T1 iff T0 <: X1 and T0 <: S1 |
| * @description Check that if type T1 is a promoted type variables X1 & S1 and |
| * T0 <: X1 and T0 <: S1 then T0 is a subtype of T1. |
| * @author sgrekhov@unipro.ru |
| */ |
| class X1 { |
| const X1(); |
| } |
| class S1 extends X1 { |
| const S1(); |
| } |
| |
| class T0 extends S1 {} |
| //# @T0 = T0 |
| //# @T1 = S1 |
| |
| T0 t0Instance = new T0(); |
| X1 t1Instance = new S1(); |
| |
| const t1Default = const S1(); |
| |
| //# <!-- Global variables & classes definition --> |
| |
| main() { |
| X1 t1Instance = new S1(); |
| if (t1Instance is S1) { |
| //# <!-- Test body --> |
| } |
| } |