}
  }

  private static class ImmediateScheduledFuture<V> extends SimpleForwardingListenableFuture<V>
      implements ListenableScheduledFuture<V> {
    static <V> ListenableScheduledFuture<V> of(V value) {
      return new ImmediateScheduledFuture<>(immediateFuture(value));
    }

    static <V> ListenableScheduledFuture<V> failed(Throwable t) {
      return new ImmediateScheduledFuture<>(immediateFailedFuture(t));
    }