function = null;
    }

    /*
     * If set()/setValue() throws an Error, we let it propagate. Why? The most likely Error is a
     * StackOverflowError (from deep transform(..., directExecutor()) nesting), and calling
     * setException(stackOverflowError) would fail:
     *
     * - If the stack overflowed before set()/setValue() could even store the result in the output

    }

    this.mayInterruptIfRunning = mayInterruptIfRunning;
    state = State.CANCELLED;
    notifyAndClearListeners();

    if (delegate != null) {
      // TODO(lukes): consider adding the StackOverflowError protection from the server version
      delegate.cancel(mayInterruptIfRunning);
    }

    return true;
  }

  protected void interruptTask() {}

  @Override

          String message = "Timed out";
          // This try-finally block ensures that we complete the timeout future, even if attempting
          // to produce the message throws (probably StackOverflowError from delegate.toString())
          try {
            if (timer != null) {
              long overDelayMs = Math.abs(timer.getDelay(TimeUnit.MILLISECONDS));

      prev.setFuture(curr);
      prev = curr;
    }
    // prev represents the 'innermost' future
    prev.set("done");
    assertTrue(orig.isDone());
  }

  // Verify that StackOverflowError in a long chain of SetFuture doesn't cause the entire toString
  // call to fail
  @J2ktIncompatible
  @GwtIncompatible
  @AndroidIncompatible
  public void testSetFutureToString_stackOverflow() {

   * stack-overflow tests work. It must depend on the exact place the error occurs.
   */
  @AndroidIncompatible
  @J2ktIncompatible
  @GwtIncompatible // StackOverflowError
  public void testTransform_StackOverflow() throws Exception {
    {
      /*
       * Initialize all relevant classes before running the test, which may otherwise poison any

      prev.setFuture(curr);
      prev = curr;
    }
    // prev represents the 'innermost' future
    prev.set("done");
    assertTrue(orig.isDone());
  }

  // Verify that StackOverflowError in a long chain of SetFuture doesn't cause the entire toString
  // call to fail
  @J2ktIncompatible
  @GwtIncompatible
  @AndroidIncompatible
  public void testSetFutureToString_stackOverflow() {

   * stack-overflow tests work. It must depend on the exact place the error occurs.
   */
  @AndroidIncompatible
  @J2ktIncompatible
  @GwtIncompatible // StackOverflowError
  public void testTransform_StackOverflow() throws Exception {
    {
      /*
       * Initialize all relevant classes before running the test, which may otherwise poison any

    return outputFuture;
  }

  enum RunningState {
    NOT_RUN,
    CANCELLED,
    STARTED,
  }

  /**
   * This class helps avoid a StackOverflowError when large numbers of tasks are submitted with
   * {@link MoreExecutors#directExecutor}. Normally, when the first future completes, all the other

      builder.append("]");
    } else {
      String pendingDescription;
      try {
        pendingDescription = Strings.emptyToNull(pendingToString());
      } catch (Exception | StackOverflowError e) {
        // Any Exception is either a RuntimeException or sneaky checked exception.
        //
        // Don't call getMessage or toString() on the exception, in case the exception thrown by the

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