| // Copyright (c) 2017, 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. |
| |
| // Tests that `void` accepts any value and won't throw on non-`null` values. |
| // The test is set up in a way that `--trust-type-annotations` and type |
| // propagation must not assume that `void` is `null` either. |
| |
| import 'package:expect/expect.dart'; |
| |
| class A { |
| void foo() { |
| return bar(); |
| } |
| |
| void bar() {} |
| } |
| |
| class B extends A { |
| int bar() => 42; |
| } |
| |
| // Makes the typing cleaner: the return type here is `dynamic` and we are |
| // guaranteed that there won't be any warnings. |
| // Dart2js can still infer the type by itself. |
| @pragma('dart2js:noInline') |
| dynamic callFoo(A a) => a.foo(); |
| |
| main() { |
| var a = new A(); |
| var b = new B(); |
| // The following line is not throwing, even though `a.foo()` (inside |
| // `callFoo`) is supposedly `void`. |
| callFoo(b).abs(); |
| Expect.isNull(callFoo(a)); |
| Expect.equals(42, callFoo(b)); |
| } |