| // 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. | |
| // SharedOptions=--enable-experiment=non-nullable | |
| main() {} | |
| extension E<T> on T? { | |
| T foo() => throw 0; | |
| } | |
| void f(int? a) { | |
| a.foo(); | |
| } |