// 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. | |
abstract class I { | |
foo([a]); | |
} | |
abstract class A { | |
foo() {} | |
} | |
abstract class B extends A implements I {} | |
class C extends B { | |
foo([a]) {} | |
} | |
void main() {} |