assertThrows(
        IllegalArgumentException.class,
        () -> {
          Set<Set<Integer>> unused = powerSet(ContiguousSet.closed(0, Integer.MAX_VALUE / 2));
        });

    assertThrows(NullPointerException.class, () -> powerSet(singleton(null)));
  }

  public void testPowerSetEqualsAndHashCode_verifyAgainstHashSet() {
    ImmutableList<Integer> allElements =
        ImmutableList.of(

   * @return {@code ImmutableListMultimap} mapping the result of evaluating the function {@code
   *     keyFunction} on each value in the input collection to that value
   * @throws NullPointerException if any element of {@code values} is {@code null}, or if {@code
   *     keyFunction} produces {@code null} for any key
   */
  public static <K, V> ImmutableListMultimap<K, V> index(

   * @return {@code ImmutableListMultimap} mapping the result of evaluating the function {@code
   *     keyFunction} on each value in the input collection to that value
   * @throws NullPointerException if any element of {@code values} is {@code null}, or if {@code
   *     keyFunction} produces {@code null} for any key
   */
  public static <K, V> ImmutableListMultimap<K, V> index(

     * change). To access the renamed file it is necessary to construct a
     * new {@code SmbFile}</i>.
     *
     * @param  dest  An <code>SmbFile</code> that represents the new pathname
     * @throws NullPointerException
     *         If the <code>dest</code> argument is <code>null</code>
     * @throws SmbException if an error occurs during the rename operation
     */