code: def call(corofunc, *args, **kwargs):
      
      corofunc = _ensure_coroutine_function(corofunc)
      def f(seed_tuple):
          return corofunc(seed_tuple, *args, **kwargs)
      return f
docs: :return:
          a delegator function that returns a coroutine object by calling
          ``corofunc(seed_tuple, *args, **kwargs)``.