// 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 positional parameter in addition to the 
/// two required ones.
/// @author rodionov


class C {
  operator []=(var x, var y, [var o]) {}
//         ^
// [analyzer] unspecified
// [cfe] unspecified
}

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