fn smallest(v: &[i32]) -> &i32 {
    let mut s = &v[0];
    for r in &v[1..] {
        if *r < *s {
            s = r;
        }
    }
    s
}

fn main() {
    let s;
    {
        let v = [2,1,3];
        s = smallest(&v);
    }
    println!("{}", *s)
}