Language/Expressions/Constants/identical_t02.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 if identical() is redefined, its invocation is not
 * a constant expressions.
 * @compile-error
 * @author kaigorodov
 */

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

bool identical(var a, var b) {
  return a.equals(b);
}

final constList = const [
  identical("a", "b"),
];

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