// 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. // Dart test program to test arithmetic operations. class I {} class A implements I {} class B implements I {} /*@compile-error=unspecified*/ class C extends A implements B {} main() { new C(); }