| // Copyright (c) 2022, 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 The new rules are incorporated into the existing productions for |
| /// declaring variables like so: |
| /// |
| /// localVariableDeclaration ::= |
| /// | metadata initializedVariableDeclaration ';' // Existing. |
| /// | metadata patternVariableDeclaration ';' // New. |
| /// |
| /// forLoopParts ::= |
| /// | // Existing productions... |
| /// | metadata ( 'final' | 'var' ) outerPattern 'in' expression // New. |
| /// As with regular for-in loops, it is a compile-time error if the type of |
| /// expression in a pattern-for-in loop is not assignable to Iterable<dynamic>. |
| /// |
| /// @description Check that it is a compile-time error if a final variable is |
| /// assigned in a for-in loop. Test a record pattern |
| /// @author sgrekhov22@gmail.com |
| |
| class Meta { |
| const Meta(); |
| } |
| |
| main() { |
| for (@Meta() final (a1, b1) in [(1, 2)]) { |
| a1 = 3; |
| // ^^ |
| // [analyzer] unspecified |
| // [cfe] unspecified |
| b1 = 4; |
| // ^^ |
| // [analyzer] unspecified |
| // [cfe] unspecified |
| } |
| for (final (num a2, n: String b2) in [(3.14, n: "pi")]) { |
| a2 = 2.71; |
| // ^^ |
| // [analyzer] unspecified |
| // [cfe] unspecified |
| b2 = "e"; |
| // ^^ |
| // [analyzer] unspecified |
| // [cfe] unspecified |
| } |
| for (final (:num n1, :n2) in [(n1: 3.14, n2: "pi")]) { |
| n1 = 2.71; |
| // ^^ |
| // [analyzer] unspecified |
| // [cfe] unspecified |
| n2 = "e"; |
| // ^^ |
| // [analyzer] unspecified |
| // [cfe] unspecified |
| } |
| } |
