#![feature(nll)]

struct X {
    x: i32, // read-only, will never change
    y: i32, // writeable
}

impl X {
    fn add(&mut self) {
        let x = &self.x;
        //let _ = x + 1;

        self.add2();

        println!("{}", &x);

        //let x = &self.x; // borrow No 2
        //let _ = x + 2;
    }

    fn add2(&mut self) {
        self.x += 123;
    }
}


fn main() {
    let mut s = X { x: 1, y: 2 };
    s.add();
    s.add2();
}