* executor promptly, or else the returned {@code ListenableFuture} may fail to work. The task's
   * execution consists of blocking until the input future is {@linkplain Future#isDone() done}, so
   * each call to this method may claim and hold a thread for an arbitrary length of time. Use of
   * bounded executors or other executors that may fail to execute a task promptly may result in
   * deadlocks.
   *

    try {
      getList().subList(1, 0);
      fail("subList(1, 0) should throw");
    } catch (IndexOutOfBoundsException expected) {
    } catch (IllegalArgumentException expected) {
      /*
       * The subList() docs claim that this should be an
       * IndexOutOfBoundsException, but many JDK implementations throw
       * IllegalArgumentException:
       * http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4506427
       */
    }
  }

  private class Itr implements Iterator<E> {
    /** Index of element to be returned by next, or a negative number if no such. */
    private int nextIndex;

    /**
     * nextItem holds on to item fields because once we claim that an element exists in hasNext(),
     * we must return it in the following next() call even if it was in the process of being removed
     * when hasNext() was called.
     */
    private @Nullable E nextItem;

    try {
      getList().subList(1, 0);
      fail("subList(1, 0) should throw");
    } catch (IndexOutOfBoundsException expected) {
    } catch (IllegalArgumentException expected) {
      /*
       * The subList() docs claim that this should be an
       * IndexOutOfBoundsException, but many JDK implementations throw
       * IllegalArgumentException:
       * http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4506427
       */
    }
  }

  private class Itr implements Iterator<E> {
    /** Index of element to be returned by next, or a negative number if no such. */
    private int nextIndex;

    /**
     * nextItem holds on to item fields because once we claim that an element exists in hasNext(),
     * we must return it in the following next() call even if it was in the process of being removed
     * when hasNext() was called.
     */
    private @Nullable E nextItem;