Language/Expressions/Function_Invocation/sync_generator_invokation_t02.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 If f is marked sync*, then a fresh instance i implementing
 * the built-in class Iterable is associated with the invocation and
 * immediately returned.
 *    A Dart implementation will need to provide a specific implementation of
 *  Iterable that will be returned by sync* methods. A typical strategy would
 *  be to produce an instance of a subclass of class IterableBase defined in
 *  dart:core. The only method that needs to be added by the Dart
 *  implementation in that case is iterator.
 *
 * @description Check that body of sync generator function is not executed
 * before Iterable instance is returned.
 *
 * @author a.semenov@unipro.ru
 */

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

bool bodyExecuted = false;

Iterable test() sync* {
  bodyExecuted = true;
  yield 1;
}

main() {
  for (var i = 0; i < 10; i++) {
    test();
    Expect.isFalse(bodyExecuted);
  }
}