| // 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. | |
| // @dart=2.9 | |
| class A {} | |
| class B {} | |
| extension on A { | |
| void foo(A a, B b) {} | |
| } | |
| void main() { | |
| dynamic a = A(); | |
| dynamic b = B(); | |
| A().foo(a, b); | |
| } |