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

        let channel_name = parts.next().ok_or(RequestParserError::UnexpectedEOF)?;

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

        Ok((Request::Unsubscribe(channel_name.to_string()), ""))

    }

    fn parse_response(

        parts: ResponseAttributes<'_>,

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

        debug_assert!(parts.is_empty());

        Ok(())

    }