| // Copyright (c) 2024, 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. | |
| typedef Invariant<X> = X Function(X x); | |
| X inferable<X>() => throw 0; | |
| void context<X>(Invariant<X> Function() g) => g(); | |
| test() => context(() => inferable()); |