Language/Expressions/Constants/identical_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 A constant expression is an expression whose value can never
 * change, and that can be evaluated entirely at compile time.
 * A constant expression is one of the following:
 * . . .
 * • An expression of the form identical(e1, e2) where e1 and e2 are constant
 *   expressions and identical is statically bound to the predefined dart
 *   function identical() discussed above.
 * @description Checks that various expressions of the specified forms can be
 * used in a constant list literal and are, therefore, constant expressions.
 * @author iefremov
 */

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

final constList = const [
  identical("a", "b"),
  !identical(true, false),
  identical("a", false),
  identical(((1 == 2) != ("" == "b")), (false != true)),
  identical(null, ''),
  identical(1, null),
  identical(null, null)
];

main() {
  Expect.isTrue(constList is List);
}