fn main() {
    let mut x = 0;
    let x_ref = &x;
    println!("{}", *x_ref);
    x = 1337;
    println!("{}", *x_ref);

    {
        let y = 42;
        let y_ref = &y;
        println!("{}", *y_ref);
    }
    println!("{}", *y_ref);
j