if (i1.hasNext()) {
                            res1 = i1.next();
                        } else {
                            done = true;
                        }
                    }
                } else {
                    // move on to next in r1
                    if (i1.hasNext()) {
                        res1 = i1.next();
                    } else {

    // Test data
    List<String> list = new ArrayList<>(asList("a", "b"));

    // Test & Verify
    Iterator<String> i1 = Iterables.consumingIterable(list).iterator();
    Iterator<String> i2 = Iterables.consumingIterable(list).iterator();

    i1.next();
    assertThrows(ConcurrentModificationException.class, () -> i2.next());
  }

  public void testConsumingIterable_queue_iterator() {

    // Test data
    List<String> list = new ArrayList<>(asList("a", "b"));

    // Test & Verify
    Iterator<String> i1 = Iterables.consumingIterable(list).iterator();
    Iterator<String> i2 = Iterables.consumingIterable(list).iterator();

    i1.next();
    assertThrows(ConcurrentModificationException.class, () -> i2.next());
  }

  public void testConsumingIterable_queue_iterator() {

	encOff = encCumulativeSum + startPkgNum*sseDAREEncPackageBlockSize
	// Locate the part containing the end of the required range
	endOffset := off + length - 1
	for i1, size := range sizes[partStart:] {
		i := partStart + i1
		if endOffset < cumulativeSum+size {
			partEnd = i
			break
		}
		cumulativeSum += size
		encPartSize, _ := sio.EncryptedSize(uint64(size))