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 {