code: def invoke(self, fn, scheduler):
      # type: (Callable, Any) -> None
      if self.trampoline_enabled:
          self._async_invoke(fn, scheduler)
      else:
          scheduler.call(fn)
  
imports: from collections import deque
  from threading import local
label_desc: Use image node_id 9 for calling the Async obj's underlying member method code with example usage: obj.invoke(fn, scheduler) without return types