}

    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

      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