*     such index exists.
   */
  public static int lastIndexOf(short[] array, short target) {
    return lastIndexOf(array, target, 0, array.length);
  }

  // TODO(kevinb): consider making this public
  private static int lastIndexOf(short[] array, short target, int start, int end) {
    for (int i = end - 1; i >= start; i--) {
      if (array[i] == target) {

   *     such index exists.
   */
  public static int lastIndexOf(short[] array, short target) {
    return lastIndexOf(array, target, 0, array.length);
  }

  // TODO(kevinb): consider making this public
  private static int lastIndexOf(short[] array, short target, int start, int end) {
    for (int i = end - 1; i >= start; i--) {
      if (array[i] == target) {

   *     such index exists.
   */
  public static int lastIndexOf(double[] array, double target) {
    return lastIndexOf(array, target, 0, array.length);
  }

  // TODO(kevinb): consider making this public
  private static int lastIndexOf(double[] array, double target, int start, int end) {
    for (int i = end - 1; i >= start; i--) {
      if (array[i] == target) {

    assertThat(iia.lastIndexOf(1)).isEqualTo(1);
    assertThat(iia.lastIndexOf(8)).isEqualTo(5);
    assertThat(iia.lastIndexOf(4)).isEqualTo(-1);
    assertThat(ImmutableIntArray.of(13).lastIndexOf(13)).isEqualTo(0);
    assertThat(ImmutableIntArray.of().lastIndexOf(21)).isEqualTo(-1);
    assertThat(iia.subArray(1, 5).lastIndexOf(1)).isEqualTo(0);
  }

  public void testContains() {

    }
    return -1;
  }

  /**
   * Returns the largest index for which {@link #get} returns {@code target}, or {@code -1} if no
   * such index exists. Equivalent to {@code asList().lastIndexOf(target)}.
   */
  public int lastIndexOf(long target) {
    for (int i = end - 1; i >= start; i--) {
      if (array[i] == target) {
        return i - start;
      }
    }
    return -1;
  }

  /**

    }
    return -1;
  }

  /**
   * Returns the largest index for which {@link #get} returns {@code target}, or {@code -1} if no
   * such index exists. Equivalent to {@code asList().lastIndexOf(target)}.
   */
  public int lastIndexOf(int target) {
    for (int i = end - 1; i >= start; i--) {
      if (array[i] == target) {
        return i - start;
      }
    }
    return -1;
  }

  /**

  public void testLastIndexOf() {
    assertThat(Longs.lastIndexOf(EMPTY, 1L)).isEqualTo(-1);
    assertThat(Longs.lastIndexOf(ARRAY1, 2L)).isEqualTo(-1);
    assertThat(Longs.lastIndexOf(ARRAY234, 1L)).isEqualTo(-1);
    assertThat(Longs.lastIndexOf(new long[] {-1L}, -1L)).isEqualTo(0);
    assertThat(Longs.lastIndexOf(ARRAY234, 2L)).isEqualTo(0);
    assertThat(Longs.lastIndexOf(ARRAY234, 3L)).isEqualTo(1);

  }

  public void testLastIndexOf() {
    assertThat(Shorts.lastIndexOf(EMPTY, (short) 1)).isEqualTo(-1);
    assertThat(Shorts.lastIndexOf(ARRAY1, (short) 2)).isEqualTo(-1);
    assertThat(Shorts.lastIndexOf(ARRAY234, (short) 1)).isEqualTo(-1);
    assertThat(Shorts.lastIndexOf(new short[] {(short) -1}, (short) -1)).isEqualTo(0);
    assertThat(Shorts.lastIndexOf(ARRAY234, (short) 2)).isEqualTo(0);

    assertThat(iia.lastIndexOf(1)).isEqualTo(1);
    assertThat(iia.lastIndexOf(8)).isEqualTo(5);
    assertThat(iia.lastIndexOf(4)).isEqualTo(-1);
    assertThat(ImmutableDoubleArray.of(13).lastIndexOf(13)).isEqualTo(0);
    assertThat(ImmutableDoubleArray.of().lastIndexOf(21)).isEqualTo(-1);
    assertThat(iia.subArray(1, 5).lastIndexOf(1)).isEqualTo(0);
  }

  public void testContains() {

        }

        @Override
        public int indexOf(final Object o) {
            return parent.indexOf(o);
        }

        @Override
        public int lastIndexOf(final Object o) {
            return parent.lastIndexOf(o);
        }

        @Override
        public ListIterator<E> listIterator() {
            return parent.listIterator();
        }

        @Override