| // Copyright (c) 2024, 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 pattern on the left side of an assignment expression is used to |
| /// destructure the assigned value. We extend expression: |
| /// |
| /// expression ::= patternAssignment |
| /// | // Existing productions... |
| /// |
| /// patternAssignment ::= outerPattern '=' expression |
| /// |
| /// This syntax allows chaining pattern assignments and mixing them with other |
| /// assignments, but does not allow patterns to the left of a compound |
| /// assignment operator. |
| /// |
| /// @description Check that pattern assignments may be chained. Test record |
| /// pattern |
| /// @author sgrekhov22@gmail.com |
| |
| import '../../Utils/expect.dart'; |
| |
| void main() { |
| var y = 0; |
| var z1 = (y,) = (y,) = (y,) = (1,); |
| Expect.equals(1, y); |
| Expect.equals((1,), z1); |
| |
| var z2 = (y: y) = (y: y) = (y: y); |
| Expect.equals(1, y); |
| Expect.equals((y: 1), z2); |
| } |