nextComplementRangeLowerBound = positiveRange.upperBound;
          } else {
            negativeRange = Range.create(nextComplementRangeLowerBound, Cut.<C>aboveAll());
            nextComplementRangeLowerBound = Cut.aboveAll();
          }
          return Maps.immutableEntry(negativeRange.lowerBound, negativeRange);
        }
      };
    }

    @Override