tests/language/syncstar_yield_test.dart

// Copyright (c) 2015, 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.

import "package:expect/expect.dart";

Iterable<int> foo1() sync* {
  yield 1;
}

Iterable<int> foo2(p) sync* {
  bool t = false;
  yield null;
  while (true) {
    a:
    for (int i = 0; i < p; i++) {
      if (!t) {
        for (int j = 0; j < 3; j++) {
          yield -1;
          t = true;
          break a;
        }
      }
      yield i;
    }
  }
}

// p is copied to all Iterators from the Iterable returned by foo3.
// Also each iterator will have its own i.
Iterable<int> foo3(int p) sync* {
  int i = 0;
  i++;
  p++;
  yield p + i;
}

main() {
  Expect.listEquals([1], foo1().toList());
  Expect.listEquals(
      [null, -1, 0, 1, 2, 3, 0, 1, 2, 3], foo2(4).take(10).toList());
  Iterable t = foo3(0);
  Iterator it1 = t.iterator;
  Iterator it2 = t.iterator; //# copyParameters: ok
  it1.moveNext();
  it2.moveNext(); //# copyParameters: continued
  Expect.equals(2, it1.current);
  // TODO(sigurdm): Check up on the spec here.
  Expect.equals(2, it2.current); // //# copyParameters: continued
  Expect.isFalse(it1.moveNext());
  // Test that two `moveNext()` calls are fine.
  Expect.isFalse(it1.moveNext());
  Expect.isFalse(it2.moveNext()); //# copyParameters: continued
  Expect.isFalse(it2.moveNext()); //# copyParameters: continued
}