| // 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); |
| Expect.runtimeIsType<String>(m); |
| } |