Language/Expressions/Equality/not_equal_equivalent_t01.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 An equality expression of the form e1 != e2 is equivalent to the
/// expression !(e1 == e2).
/// @description Checks that expression of the form e1 != e2 is equivalent to the
/// expression !(e1 == e2).
/// @author msyabro


import '../../../Utils/expect.dart';

class A{
  operator ==(var val) {
    return identical(this, val);
  }
}

main() {
  A a = new A();
  A b = new A();
  Expect.equals(a != a, !(a == a));
  Expect.equals(a != b, !(a == b));
}