* input futures, if all succeed.
   *
   * <p>The list of results is in the same order as the input list.
   *
   * <p>This differs from {@link #successfulAsList(ListenableFuture[])} in that it will return a
   * failed future if any of the items fails.
   *
   * <p>Canceling this future will attempt to cancel all the component futures, and if any of the