| // 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. |
| |
| // @dart = 2.9 |
| |
| /// @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 cannot be used to |
| /// initialize a constant variable if e2 is string. |
| /// @author iefremov |
| |
| |
| const m = 1 - "1"; |
| // ^ |
| // [analyzer] unspecified |
| // [cfe] unspecified |
| |
| main() { |
| try { |
| print(m); |
| } catch (x) {} |
| } |