// ref: https://users.rust-lang.org/t/ref-keyword-versus/18818/4


fn main() {
    let ref x = 1;
    let x2 = &1;

    let &y = x;
    let y2 = *x2;


    println!("{} {}", x, x2);
    println!("{} {}", y, y2);

    let s = "S".to_owned();


    match &s {
        ss => println!("{}", ss),
    }

    match s {
        ref ss => println!("{}", ss),
    }
}