code: def __iter__(self) -> Iterator:
      for x in super().__iter__():
          self.last_item = x
          yield x
      self.last_item = None
  
file_path: datasets/src/datasets/utils/track.py
imports: from collections.abc import Iterator
  from typing import Iterable
label_desc: Use image node_id 2 for calling the tracked_list obj's underlying member method code with example usage: obj.__iter__() without return types