Language/Expressions/Assignment/top_level_assignment_t04.dart

/*
 * 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 Evaluation of an assignment a of the form v = e proceeds as
 * follows:
 * Let d be the innermost declaration whose name is v or v =, if it exists.
 * ...
 * If d is the declaration of a library variable, top level getter or top level
 * setter, the expression e is evaluated to an object o. Then the setter v = is
 * invoked with its formal parameter bound to o. The value of the assignment
 * expression is o.
 * @description Checks that if d is top level setter, then the setter v= is
 * invoked with its formal parameter bound to o and  the value of the assignment
 * expression is o.
 * @author sgrekhov@unipro.ru
 */

import '../../../Utils/expect.dart';

int? _v;

void set v(int val) {
  _v = val;
}

main() {
  Expect.equals(1, v = 1);
  Expect.equals(2, v = 2);
  Expect.equals(1, v = 1);
  Expect.equals(3, v = 1 + 2);
}