#![allow(dead_code, deprecated, unused_variables, unused_mut)]
#![feature(drop_guard)]
#![allow(unused)]
use std::mem::DropGuard;
fn main() {
    {
        let s = String::from("Chashu likes tuna");
        let mut s = DropGuard::new(s, |s| println!("{s}"));
        s.push_str("!!!");
    }
}