code: def _get_activated_tasks(self, my_task, destination):
          
          task = destination._find_ancestor(self.thread_starter)
          return self.thread_starter._get_activated_tasks(task, destination)
docs: Returns the list of tasks that were activated in the previous
          call of execute(). Only returns tasks that point towards the
          destination task, i.e. those which have destination as a
          descendant.
  
          my_task -- the task of this TaskSpec
          destination -- the child task