if (this instanceof Trusted) {
      return state == State.FAILURE ? throwable : null;
    }
    return null;
  }

  final void maybePropagateCancellationTo(@Nullable Future<?> related) {
    if (related != null & isCancelled()) {
      related.cancel(wasInterrupted());
    }
  }

  @Override
  public String toString() {
    StringBuilder builder = new StringBuilder().append(super.toString()).append("[status=");

   * the given future (if available).
   */
  final void maybePropagateCancellationTo(@CheckForNull Future<?> related) {
    if (related != null & isCancelled()) {
      related.cancel(wasInterrupted());
    }
  }

  /** Releases all threads in the {@link #waiters} list, and clears the list. */
  private void releaseWaiters() {