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// 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();
}