#![allow(dead_code, deprecated, unused_variables, unused_mut)]
use std::ops::RemAssign;
struct CookieJar {
    cookies: u32,
}
impl RemAssign<u32> for CookieJar {
    fn rem_assign(&mut self, piles: u32) {
        self.cookies %= piles;
    }
}
fn main() {
    let mut jar = CookieJar { cookies: 31 };
    let piles = 4;
    println!("Splitting up {} cookies into {} even piles!", jar.cookies, piles);
    jar %= piles;
    println!("{} cookies remain in the cookie jar!", jar.cookies);
}