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

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

        let sticker_type = sticker_type

            .parse()

            .map_err(|_| RequestParserError::SyntaxError(1, sticker_type.to_owned()))?;

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

        let uri = uri

            .parse()

            .map_err(|_| RequestParserError::SyntaxError(1, uri.to_owned()))?;

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

        let name = name

            .parse()

            .map_err(|_| RequestParserError::SyntaxError(1, name.to_owned()))?;

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

        let value = value

            .parse()

            .map_err(|_| RequestParserError::SyntaxError(1, value.to_owned()))?;

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

        Ok((Request::StickerSet(sticker_type, uri, name, value), ""))

    }

    fn parse_response(

        parts: ResponseAttributes<'_>,

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

        debug_assert!(parts.is_empty());

        Ok(())

    }