// 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 It is a compile-time error to declare an optional parameter in an 
 * operator.
 * @description Checks that a compile-time error is produced if a user-defined
 * operator []= specifies one optional named parameter in addition to the two 
 * required ones.
 * @compile-error
 * @author ilya
 */

class C {
  operator []=(var x, var y, {var o}) {}
}

main() {
  C c = new C();
  c[0] = new C();
}