// Populate the results list with null initially.
    for (int i = 0; i < futures.size(); ++i) {
      values.add(null);
    }

    this.values = values;
  }

  @Override
  final void collectOneValue(int index, @ParametricNullness V returnValue) {
    @RetainedLocalRef List<@Nullable Present<V>> localValues = values;
    if (localValues != null) {
      localValues.set(index, new Present<>(returnValue));
    }
  }

      Callable<V> callable) {
    super(futures, allMustSucceed, false);
    this.task = new CallableInterruptibleTask(callable, listenerExecutor);
    init();
  }

  @Override
  void collectOneValue(int index, @Nullable Object returnValue) {}

  @Override
  void handleAllCompleted() {
    @RetainedLocalRef CombinedFutureInterruptibleTask<?> localTask = task;
    if (localTask != null) {
      localTask.execute();