异步销毁 在Tokio中异步执行的智能指针下降。 基本用法 依存关系 async_destruction = " 0.1 " tokio = { version = ' 1 ' , features = [ " full " ] } # Only used in the current example chrono = " 0.4 " 演示 use async_destruction :: AsyncDestruction; use chrono :: Utc; use std :: {thr