#[derive(Debug)]
struct S<'a> {
    v: Vec<&'a usize>
}

impl<'a> S<'a> {
    pub fn new() -> S<'a> {
        S {
            v: Vec::new(),
        }
    }
}

fn main() {
    let mut arr = [0usize; 10];
    let mut s = S::new();
    for i in 0..10 {
        arr[i] = i;
    }
    s.v.extend(&arr);
    println!("arr: {:?}", arr);
    println!("s: {:?}", s);
}