import static com.google.common.util.concurrent.Futures.scheduleAsync;
import static com.google.common.util.concurrent.Futures.submit;
import static com.google.common.util.concurrent.Futures.submitAsync;
import static com.google.common.util.concurrent.Futures.successfulAsList;
import static com.google.common.util.concurrent.Futures.transform;
import static com.google.common.util.concurrent.Futures.transformAsync;

import static com.google.common.util.concurrent.Futures.scheduleAsync;
import static com.google.common.util.concurrent.Futures.submit;
import static com.google.common.util.concurrent.Futures.submitAsync;
import static com.google.common.util.concurrent.Futures.successfulAsList;
import static com.google.common.util.concurrent.Futures.transform;
import static com.google.common.util.concurrent.Futures.transformAsync;

    @SuppressWarnings({"unused", "nullness"})
    Future<?> possiblyIgnoredError = serializer.submitAsync(firstCallable, directExecutor());
    TestCallable secondCallable = new TestCallable(immediateVoidFuture());
    @SuppressWarnings({"unused", "nullness"})
    Future<?> possiblyIgnoredError1 = serializer.submitAsync(secondCallable, directExecutor());
    assertThat(firstCallable.called).isTrue();

    @SuppressWarnings({"unused", "nullness"})
    Future<?> possiblyIgnoredError = serializer.submitAsync(firstCallable, directExecutor());
    TestCallable secondCallable = new TestCallable(immediateVoidFuture());
    @SuppressWarnings({"unused", "nullness"})
    Future<?> possiblyIgnoredError1 = serializer.submitAsync(secondCallable, directExecutor());
    assertThat(firstCallable.called).isTrue();

   *
   * @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>() {

   *
   * @throws java.util.concurrent.RejectedExecutionException if the task cannot be scheduled for
   *     execution
   * @since 30.1
   */
  public static <V extends @Nullable Object> ClosingFuture<V> submitAsync(
      AsyncClosingCallable<V> callable, Executor executor) {
    checkNotNull(callable);
    CloseableList closeables = new CloseableList();
    TrustedListenableFutureTask<V> task =