*
   * @throws RejectedExecutionException if the task cannot be scheduled for execution
   * @since 23.0
   */
  public static <O extends @Nullable Object> ListenableFuture<O> submitAsync(
      AsyncCallable<O> callable, Executor executor) {
    TrustedListenableFutureTask<O> task = TrustedListenableFutureTask.create(callable);
    executor.execute(task);
    return task;
  }

  /**

    waitUntilClosed(closingFuture);
    assertClosed(closeable1, closeable2);
  }

  public void testSubmitAsync() throws Exception {
    ClosingFuture<TestCloseable> closingFuture =
        ClosingFuture.submitAsync(
            closer -> {
              closer.eventuallyClose(closeable1, closingExecutor);
              return ClosingFuture.submit(
                  new ClosingCallable<TestCloseable>() {

    waitUntilClosed(closingFuture);
    assertClosed(closeable1, closeable2);
  }

  public void testSubmitAsync() throws Exception {
    ClosingFuture<TestCloseable> closingFuture =
        ClosingFuture.submitAsync(
            closer -> {
              closer.eventuallyClose(closeable1, closingExecutor);
              return ClosingFuture.submit(
                  new ClosingCallable<TestCloseable>() {