}
          };
      ClosingFuture<V> derived =
          new ClosingFuture<>(futureCombiner().callAsync(asyncCallable, executor));
      derived.closeables.add(closeables, directExecutor());
      return derived;
    }

    private FutureCombiner<@Nullable Object> futureCombiner() {
      return allMustSucceed
          ? Futures.whenAllSucceed(inputFutures())