| // Copyright (c) 2016, 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 for statement of the form for (finalConstVarOrType? id in e) s |
| /// is equivalent to the following code: |
| /// var n0 = e.iterator; |
| /// while (n0.moveNext()) { |
| /// finalConstVarOrType? id = n0.current; |
| /// s |
| /// } |
| /// where n0 is an identifier that does not occur anywhere in the program, except |
| /// that for purposes of static typechecking, it is checked under the assumption |
| /// that n0 is declared to be of type T, where T is the static type of e.iterator. |
| /// @description Checks that a loop variable in for-in statement may be declared |
| /// final. |
| /// @author ngl@unipro.ru |
| |
| import '../../../../Utils/expect.dart'; |
| |
| main() { |
| List<int> e = [1, 2, 3, 4, 5, 6, 7, 8]; |
| int sum1 = 0; |
| for (final int id in e) { |
| sum1 = sum1 * 2 + id; |
| } |
| |
| var n = e.iterator; |
| int sum2 = 0; |
| while (n.moveNext()) { |
| final int id = n.current; |
| sum2 = sum2 * 2 + id; |
| } |
| |
| int sum3 = 0; |
| for (final id in e) { |
| sum3 = sum3 * 2 + id; |
| } |
| |
| Expect.equals(sum1, sum2); |
| Expect.equals(sum3, sum2); |
| } |