}
      ImmutableList<Range<C>> mergedRanges = mergedRangesBuilder.build();
      if (mergedRanges.isEmpty()) {
        return of();
      } else if (mergedRanges.size() == 1
          && Iterables.getOnlyElement(mergedRanges).equals(Range.all())) {
        return all();
      } else {
        return new ImmutableRangeSet<>(mergedRanges);
      }
    }
  }