docs: def check_return(callable_name: str, r: typing.Any,
                   hints: typing.Mapping[str, type]) -> None:
      """Check return type, raise :class:`TypeError` if return type is not
      expected type.
  
      :param str callable_name: callable name of :func:`~.typechecked` checked
      :param r: returned result
      :param hints: assumed type of given ``r``
  
      """
      correct = True
      if 'return' not in hints:
          return
      _, correct = check_type(r, hints['return'])
      if not correct:
          raise TypeError(
              'Incorrect return type `{}`, expected {}. for: {}'.format(
                  type(r), hints.get('return'), callable_name
              )
          )