| /* |
| * 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: |
| * Left Null: if T0 is Null then: |
| * - if T1 is a type variable (promoted or not) the query is false |
| * - If T1 is FutureOr<S> for some S, then the query is true iff Null <: S. |
| * - If T1 is Null, S? or S* for some S, then the query is true. |
| * - Otherwise, the query is false |
| * @description Check that if type T0 is Null and If T1 is S* then T0 is |
| * subtype of T1 |
| * @author sgrekhov@unipro.ru |
| */ |
| /** |
| * @description Check that if type T0 is a subtype of a type T1, then instance |
| * of T0 can be be used as a return value of type T1 |
| * @author sgrekhov@unipro.ru |
| */ |
| /* |
| * This test is generated from left_null_A06.dart and |
| * return_value_x01.dart. |
| * Don't modify it. If you want to change this file, change one of the files |
| * above and then run generator.dart to regenerate the tests. |
| */ |
| |
| |
| // Requirements=nnbd-weak |
| import "../../utils/legacy_lib.dart"; |
| |
| Null t0Instance = null; |
| X? t1Instance = new X(); |
| |
| const t1Default = const X(); |
| |
| |
| |
| |
| X? returnValueFunc() => t0Instance; |
| |
| class ReturnValueTest { |
| static X? staticTestMethod() => t0Instance; |
| |
| X? testMethod() => t0Instance; |
| |
| X? get testGetter => t0Instance; |
| } |
| |
| main() { |
| X? returnValueLocalFunc() => t0Instance; |
| |
| returnValueFunc(); |
| returnValueLocalFunc(); |
| |
| ReturnValueTest.staticTestMethod(); |
| |
| new ReturnValueTest().testMethod(); |
| new ReturnValueTest().testGetter; |
| |
| } |