Language/Expressions/Constants/math_operators_t07.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 e1 + e2 where e1 and e2 are constant expressions
 *   that evaluate to a numeric or string value or to null.
 * • An expression of one of the forms −e, e1 - e2, e1 * e2, e1 / e2, e1 ˜/ e2,
 *   e1 > e2, e1 < e2, e1 >= e2, e1 <= e2 or e1 % e2, where e, e1 and e2 are
 *   constant expressions that evaluate to a numeric value or to null.
 * @description Checks that an expression of the form e1 + e2 can be used to
 * initialize a constant variable if e1 and e2 are strings.
 * @author ngl@unipro.ru
 */

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

const m = "ab" + "cd";

main() {
  Expect.isTrue(m is String);
}