// cancellation can interleave in 3 ways
        // 1. prior to setFuture
        // 2. after setFuture before set() on the future assigned
        // 3. after setFuture and set() are called but before the listener completes.
        if (!setFutureSetSuccess.get() || !setFutureCompletionSuccess.get()) {
          // If setFuture fails or set on the future fails then it must be because that future was
          // cancelled

    SettableFuture<String> nested = SettableFuture.create();
    assertTrue(future.setFuture(nested));
    // Later attempts to set the future should return false.
    assertFalse(future.set("x"));
    assertFalse(future.setException(new Exception("bar")));
    assertFalse(future.setFuture(SettableFuture.create()));
    // Check that the future has been set properly.
    assertFalse(future.isDone());

    assertCancelled(future, true);
  }

  public void testSetFuturePending() throws Exception {
    assertThat(future.setFuture(delegate)).isTrue();
    assertSetAsynchronously(future);
  }

  public void testSetFutureThenCancel() throws Exception {
    assertThat(future.setFuture(delegate)).isTrue();
    assertThat(future.cancel(false /* mayInterruptIfRunning */)).isTrue();
    assertCancelled(future, false);

    SettableFuture<String> nested = SettableFuture.create();
    assertTrue(future.setFuture(nested));
    // Later attempts to set the future should return false.
    assertFalse(future.set("x"));
    assertFalse(future.setException(new Exception("bar")));
    assertFalse(future.setFuture(SettableFuture.create()));
    // Check that the future has been set properly.
    assertFalse(future.isDone());

        // cancellation can interleave in 3 ways
        // 1. prior to setFuture
        // 2. after setFuture before set() on the future assigned
        // 3. after setFuture and set() are called but before the listener completes.
        if (!setFutureSetSuccess.get() || !setFutureCompletionSuccess.get()) {
          // If setFuture fails or set on the future fails then it must be because that future was
          // cancelled

        () -> {
          if (taskFuture.isDone()) {
            // Since the value of oldFuture can only ever be immediateVoidFuture() or setFuture of a
            // future that eventually came from immediateVoidFuture(), this doesn't leak throwables
            // or completion values.
            newFuture.setFuture(oldFuture);
          } else if (outputFuture.isCancelled() && taskExecutor.trySetCancelled()) {

            executor.execute(runnable);
          }
        };
    Future<?> future = newFutureInstance();
    future
        .getClass()
        .getMethod(
            "setFuture",
            future.getClass().getClassLoader().loadClass(ListenableFuture.class.getName()))
        .invoke(future, badFuture);
    CancellationException expected = assertThrows(CancellationException.class, () -> future.get());

        () -> {
          if (taskFuture.isDone()) {
            // Since the value of oldFuture can only ever be immediateVoidFuture() or setFuture of a
            // future that eventually came from immediateVoidFuture(), this doesn't leak throwables
            // or completion values.
            newFuture.setFuture(oldFuture);
          } else if (outputFuture.isCancelled() && taskExecutor.trySetCancelled()) {

    public void run() {
      // This prevents cancellation from propagating because we don't call setFuture(delegate) until
      // delegate is already done, so calling cancel() on this future won't affect it.
      @RetainedLocalRef ListenableFuture<V> localDelegate = delegate;
      if (localDelegate != null) {
        setFuture(localDelegate);
      }
    }

    @Override
    protected @Nullable String pendingToString() {

   *   <li>{@link Cancellation} terminal state, {@code cancel} was called.
   *   <li>{@link Failure} terminal state, {@code setException} was called.
   *   <li>{@link DelegatingToFuture} intermediate state, {@code setFuture} was called.
   *   <li>{@link #NULL} terminal state, {@code set(null)} was called.
   *   <li>Any other non-null value, terminal state, {@code set} was called with a non-null
   *       argument.
   * </ul>
   */