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// Copyright (c) 2018, 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.
// Check that class finalizer correctly marks supertypes of superinterfaces
// as implemented.
import 'package:expect/expect.dart';
abstract class A {
String method();
abstract class B extends A {}
class D extends A {
String method() => "D";
class C implements B {
String method() => "C";
String invoke(A a) {
return a.method();
void main(List<String> args) {
Expect.equals("C", invoke(args.contains('--use-d') ? new D() : new C()));