#Rust https://doc.rust-jp.rs/book-ja/ch10-03-lifetime-syntax.html#%E6%A7%8B%E9%80%A0%E4%BD%93%E5%AE%9A%E7%BE%A9%E3%81%AE%E3%83%A9%E3%82%A4%E3%83%95%E3%82%BF%E3%82%A4%E3%83%A0%E6%B3%A8%E9%87%88