Language/07_Classes/4_Abstract_Instance_Members_A07_t08.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 there are no static warnings if an abstract method
 * overrides an instance method and overridden method does not
 * explicitly specify a default value for its optional parameter.
 * @static-clean
 * @author msyabro
 * @reviewer rodionov
 */

class C {
  foo([x]) {}
}

abstract class A implements C {
  foo([x = 1]);
  factory A() = D;
}

class D implements A {
  foo([x = 1]) {}
}

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