Language/07_Classes/4_Abstract_Instance_Members_A07_t05.dart

/*
 * Copyright (c) 2011, 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.
 */
/**
 * @assertion Unless explicitly stated otherwise, all ordinary rules that apply to methods
 * apply to abstract methods.
 * 7.1: It is a static warning if an instance method m1 overrides an instance member m2,
 * the signature of m2 explicitly specifies a default value for a formal parameter p
 * and the signature of m1 specifies a different default value for p.
 * @description Checks that it is a static warning if an abstract method overrides
 * an abstract method and has a different default value for its optional parameter.
 * @static-warning
 * @author msyabro
 * @reviewer rodionov
 * @reviewer kaigorodov
 */

abstract class A {
  foo([x = 1]);
}

abstract class B extends A {
  foo([x = '']); /// static type warning
}

class C extends B {
  foo([x]) { /// static type warning
  }
}

main() {
  new C().foo(1);
}