rust slice pat

slice.rs

fn main() {
    #[derive(PartialEq, Debug)]
    struct X(u8);
    let xs: Vec<X> = vec![X(0), X(1), X(2)];

    if let [start @ .., end] = &*xs {
        //              --- bind on last element, assuming there is one.
        //  ---------- bind the initial elements, if there are any.
        assert_eq!(start, &[X(0), X(1)] as &[X]);
        assert_eq!(end, &X(2));
        let _: &[X] = start;
        let _: &X = end;
    }
}