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

        let state = match parts.next() {

            Some("0") => false,

            Some("1") => true,

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

            None => return Err(RequestParserError::UnexpectedEOF),

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

        Ok((Request::Repeat(state), ""))

    }

    fn parse_response(

        parts: ResponseAttributes<'_>,

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

        debug_assert!(parts.is_empty());

        Ok(())

    }