docs: def context(self, async_context):
          """\
          Opens the given asynchronous contest manager on the event loop.
          For a context manager that would be called like this::
  
              async with ctx as value:
                  body
  
          This method allows a call like this::
  
              with event_loop_thread.context(ctx) as value:
                  body
  
          The asynchronous work of the context manager is run on the dedicated thread.
          """
  
          exit = type(async_context).__aexit__
          value = self.run_coroutine(type(async_context).__aenter__(async_context)).result()
          exc = True
          try:
              try:
                  yield value
              except:
                  exc = False
                  if not self.run_coroutine(exit(async_context, *sys.exc_info())).result():
                      raise
          finally:
              if exc:
                  self.run_coroutine(exit(async_context, None, None, None)).result()