#![allow(dead_code, deprecated, unused_variables, unused_mut)]
use std::cell::RefCell;
fn main() {
    let x = RefCell::new(1);
    let mut mutable_borrow = x.borrow_mut();
    *mutable_borrow = 1;
    drop(mutable_borrow);
    let borrow = x.borrow();
    println!("{}", * borrow);
}