| // 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 The definitions of least and greatest closure are changed in null |
| /// safe libraries to substitute [Never] in positions where previously [Null |
| /// would have been substituted, and [Object?] in positions where previously |
| /// [Object] or [dynamic] would have been substituted. |
| /// @description Check that correct type is substituted for [typedef check<X> = |
| /// void Function({required X x})]. |
| /// @note Read more about the least and greatest closure test template: |
| /// https://github.com/dart-lang/co19/issues/575#issuecomment-613542349 |
| /// |
| /// @Issue 44161 |
| /// @author iarkh@unipro.ru |
| |
| // Requirements=nnbd-strong |
| |
| import "../../../../Utils/expect.dart"; |
| |
| typedef check<X> = void Function({required X x}); |
| typedef expected = void Function({required Never x}); |
| |
| void main() { |
| void f<X>(check<X> Function() g) => g(); |
| Expect.throws(() { f(() => captureTypeArgument()); }); |
| Expect.equals(expected, capturedTypeArgument); |
| } |