#![allow(dead_code, deprecated, unused_variables, unused_mut)]
fn main() {
    let v = [10, 40, 30];
    assert!(v.starts_with(& [10]));
    assert!(v.starts_with(& [10, 40]));
    assert!(v.starts_with(& v));
    assert!(! v.starts_with(& [50]));
    assert!(! v.starts_with(& [10, 50]));
}