code: def future_add_done_callback(
      future: "Future[_T]", callback: Callable[["Future[_T]"], None]
  ) -> None:
      pass
  
imports: import asyncio
  from concurrent import futures
  import functools
  import sys
  import types
  from tornado.log import app_log
  import typing
  from typing import Any, Callable, Optional, Tuple, Union
label_desc: Use image node_id 8 for calling a global function with example usage: future_add_done_callback(future, callback) without return types