* Returns a newly-created {@code ImmutableList} based on the contents of the {@code Builder},
     * sorted according to the specified comparator.
     */
    @SuppressWarnings("unchecked")
    ImmutableList<E> buildSorted(Comparator<? super E> comparator) {
      // Currently only used by ImmutableListMultimap.Builder.orderValuesBy.
      // In particular, this implies that the comparator can never get "removed," so this can't

      contents.addAll(builder.contents);
      return this;
    }

    @Override
    public ImmutableList<E> build() {
      return copyOf(contents);
    }

    ImmutableList<E> buildSorted(Comparator<? super E> comparator) {
      Collections.sort(contents, comparator);
      return copyOf(contents);
    }
  }

     * Returns a newly-created {@code ImmutableList} based on the contents of the {@code Builder},
     * sorted according to the specified comparator.
     */
    @SuppressWarnings("unchecked")
    ImmutableList<E> buildSorted(Comparator<? super E> comparator) {
      // Currently only used by ImmutableListMultimap.Builder.orderValuesBy.
      // In particular, this implies that the comparator can never get "removed," so this can't