public TreeSet<Integer> getImpl() {
      return Sets.newTreeSet(INT_COMPARATOR);
    }

    @GwtIncompatible @J2ktIncompatible private static final long serialVersionUID = 0;
  }

  public void testNewSortedSetMultimap() {
    CountingSupplier<TreeSet<Integer>> factory = new SortedSetSupplier();
    Map<Color, Collection<Integer>> map = Maps.newEnumMap(Color.class);