def _format_callable_summary (self, callable_, return_value, function_name,
            is_callable, is_pointer):
        if self.__gi_extension.language in ["python", "javascript"]:
            is_pointer = False
            return_value = None
        elif self.__gi_extension.language in ['c']:
            if not return_value:
                return_value = 'void'

        return HtmlFormatter._format_callable_summary (self, callable_, return_value,
                function_name, is_callable, is_pointer)