| /* |
| * 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 Null: T0 is Null. |
| * @description Check that if type T0 is Null then T0 is a subtype of a type T1. |
| * @author sgrekhov@unipro.ru |
| */ |
| // SharedOptions=--enable-experiment=non-nullable |
| class T1 { |
| const T1(); |
| } |
| |
| Null t0Instance = null; |
| T1? t1Instance = new T1(); |
| |
| const t1Default = const T1(); |
| |
| //# @T0 = Null |
| //# @T1 = T1? |
