message: Issue ARRAY_SLICE for LISTs
  Remove unused variable.
diff: @@ -36,7 +36,6 @@ int64_t ValueLength(const string_t &value) {
  template <typename INPUT_TYPE, typename INDEX_TYPE>
  bool ClampIndex(INDEX_TYPE &index, const INPUT_TYPE &value) {
  - const auto offset = ValueOffset<INPUT_TYPE, INDEX_TYPE>(value);
  const auto length = ValueLength<INPUT_TYPE, INDEX_TYPE>(value);
  if (index < 0) {
  if (-index > length) {
  