Rust std::process::Child kill on drop

kill_on_drop.rs

use std::{
    ops::{Deref, DerefMut},
    process::{Child, Command},
};

struct KillOnDrop(Child);

impl Drop for KillOnDrop {
    fn drop(&mut self) {
        let _ = self.0.kill();
        let _ = self.0.wait();
    }
}

impl Deref for KillOnDrop {
    type Target = Child;

    fn deref(&self) -> &Self::Target {
        &self.0
    }
}

impl DerefMut for KillOnDrop {
    fn deref_mut(&mut self) -> &mut Self::Target {
        &mut self.0
    }
}

fn main() {
    let sleep = Command::new("sleep")
        .arg("1000")
        .spawn()
        .map(KillOnDrop)
        .unwrap();
    println!("sleep: {}", sleep.id());
}