fn parse_request(mut parts: std::str::SplitWhitespace<'_>) -> RequestParserResult<'_> {

        let result = match parts.next() {

            Some("0") => Ok((Request::Pause(Some(false)), "")),

            Some("1") => Ok((Request::Pause(Some(true)), "")),

            Some(s) => Err(RequestParserError::SyntaxError(0, s.to_string())),

            None => Ok((Request::Pause(None), "")),

        debug_assert!(parts.next().is_none());

        result

    }

    fn parse_response(

        parts: ResponseAttributes<'_>,

    ) -> Result<Self::Response, ResponseParserError> {

        debug_assert!(parts.is_empty());

        Ok(())

    }