// 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.

// @dart = 2.9

/// @assertion If no default is explicitly specified for an optional parameter,
/// an implicit default of null is provided.
/// @description Checks that an implicit default value of null is provided
/// if default value is not specified explicitly.
/// @author msyabro
/// @reviewer iefremov
/// @reviewer rodionov

import "../../../../Utils/expect.dart";

f([var x, var y]) {
  Expect.equals(null, x);
  Expect.equals(null, y);
}

f2({var x, var y}) {
  Expect.equals(null, x);
  Expect.equals(null, y);
}

main() {
  f();
  f(null);

  f2();
  f2(y: null);
  f2(x: null);
}