| // Copyright (c) 2023, 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. |
| |
| abstract class A { |
| A get a; |
| } |
| |
| class B implements A { |
| @override |
| C get a => C(); |
| } |
| |
| class C implements A { |
| @override |
| B get a => B(); |
| } |
| |
| class D implements B, C { |
| @override |
| H get a => H(); |
| } |
| |
| class E implements B, C { |
| @override |
| H get a => H(); |
| } |
| |
| class F implements B, C { |
| @override |
| H get a => H(); |
| } |
| |
| class G implements B, C { |
| @override |
| H get a => H(); |
| } |
| |
| class H implements B, C { |
| @override |
| H get a => H(); |
| } |
| |
| void foo(int n, A a) { |
| if (n > 0) { |
| foo(n - 1, E()); |
| foo(n - 1, F()); |
| foo(n - 1, G()); |
| foo(n - 1, a.a); |
| } |
| } |
| |
| void main() { |
| B(); |
| C(); |
| foo(2, D()); |
| } |