请教一个 Rust 问题,提前祝大家中秋节快乐

最近接触 rust，心血来潮想写一个 rdb 解析工具，目前 aux 部分解析完成, 但是每次解析出来的值都会覆盖掉之前的值，导致最后结果为空, 以下是代码，跪求各位大佬解答 orz:

impl ParserFactory {pub fn parse(rdb_context: &[u8]) -> Result {let mut cursor = Cursor::new(rdb_context);
        let base_info = BaseInfo::parse(&mut cursor)?;
        let rdb_version:usize = base_info.rdb_version.parse().expect("Not a valid number");
        let mut aux_info = None;
        let mut db_info=  None;



        // aux 只有 rdb 版本大于等于 7 才引入
        if rdb_version < 7 {aux_info = None};

        loop {
            // 读取标志位
            let mut flag_byte = [0;1];
            if cursor.read_exact(&mut flag_byte).is_err(){break}
            match flag_byte[0] {FA => {aux_info = Some(AuxInfo::parse(&mut cursor)?);
                }
                FE => {db_info = Some(DbInfo::parse(&mut cursor)?);
                }

                FF => {println!("parse done.");
                    break
                }
                _ =>{continue;}
            }
        }

        // 组合 RDBInfo
        let rdb_info = RDBInfo {
            base_info,
            aux_info: aux_info.unwrap_or_else(|| AuxInfo {redis_server_version: String::new(),
                used_mem:0,
            }),
        };

        Ok(rdb_info)
    }

}

impl Parser for AuxInfo {fn parse(cursor: &mut Cursor<&[u8]>) -> Result {
        let mut aux_info = AuxInfo {redis_server_version: String::new(),
            used_mem: 0,
        };
        let aux_name = parser_aux_name(cursor)?;

        match aux_name.as_str() {"redis-ver" => {aux_info.redis_server_version = parser_aux_value(cursor)?;
            }
            "used-mem" => {aux_info.used_mem = parser_aux_value(cursor)?.parse::().expect("Failed to parse used-mem");
            }

            _ => {}}
        Ok(aux_info)
    }
}