* the given future (if available).
   */
  @SuppressWarnings("nullness") // TODO(b/147136275): Remove once our checker understands & and |.
  final void maybePropagateCancellationTo(@Nullable Future<?> related) {
    if (related != null & isCancelled()) {
      related.cancel(wasInterrupted());
    }
  }

  /**