* {@link #lastIndexOf} to forward to this implementation.
   *
   * @since 7.0
   */
  protected int standardLastIndexOf(@CheckForNull Object element) {
    return Lists.lastIndexOfImpl(this, element);
  }

  /**
   * A sensible default implementation of {@link #iterator}, in terms of {@link #listIterator()}. If

   * {@link #lastIndexOf} to forward to this implementation.
   *
   * @since 7.0
   */
  protected int standardLastIndexOf(@CheckForNull Object element) {
    return Lists.lastIndexOfImpl(this, element);
  }

  /**
   * A sensible default implementation of {@link #iterator}, in terms of {@link #listIterator()}. If

  private void checkLastIndexOf(List<?> toTest, int[] expected) {
    int index = 0;
    for (Object obj : toTest) {
      String name = "toTest[" + index + "] (" + obj + ")";
      assertWithMessage(name).that(Lists.lastIndexOfImpl(toTest, obj)).isEqualTo(expected[index]);
      index++;
    }
  }

  @SafeVarargs
  @SuppressWarnings("varargs")
  private final <T> List<T> createList(Class<T> listType, T... contents) {

    return (object == null) ? -1 : Lists.indexOfImpl(this, object);
  }

  @Override
  public int lastIndexOf(@Nullable Object object) {
    return (object == null) ? -1 : Lists.lastIndexOfImpl(this, object);
  }

  public final boolean addAll(int index, Collection<? extends E> newElements) {
    throw new UnsupportedOperationException();
  }

  public final E set(int index, E element) {

  private void checkLastIndexOf(List<?> toTest, int[] expected) {
    int index = 0;
    for (Object obj : toTest) {
      String name = "toTest[" + index + "] (" + obj + ")";
      assertWithMessage(name).that(Lists.lastIndexOfImpl(toTest, obj)).isEqualTo(expected[index]);
      index++;
    }
  }

  @SafeVarargs
  @SuppressWarnings("varargs")
  private final <T> List<T> createList(Class<T> listType, T... contents) {

    return (object == null) ? -1 : Lists.indexOfImpl(this, object);
  }

  @Override
  public int lastIndexOf(@CheckForNull Object object) {
    return (object == null) ? -1 : Lists.lastIndexOfImpl(this, object);
  }

  @Override
  public boolean contains(@CheckForNull Object object) {
    return indexOf(object) >= 0;
  }

  // constrain the return type to ImmutableList<E>

  /**

    return (object == null) ? -1 : Lists.indexOfImpl(this, object);
  }

  @Override
  public int lastIndexOf(@CheckForNull Object object) {
    return (object == null) ? -1 : Lists.lastIndexOfImpl(this, object);
  }

  @Override
  public boolean contains(@CheckForNull Object object) {
    return indexOf(object) >= 0;
  }

  // constrain the return type to ImmutableList<E>

  /**

        if (element.equals(list.get(i))) {
          return i;
        }
      }
    }
    return -1;
  }

  /** An implementation of {@link List#lastIndexOf(Object)}. */
  static int lastIndexOfImpl(List<?> list, @CheckForNull Object element) {
    if (list instanceof RandomAccess) {
      return lastIndexOfRandomAccess(list, element);
    } else {