#![allow(dead_code, deprecated, unused_variables, unused_mut)]
fn main() {
    let v = &[10, 40, 30];
    assert_eq!(v.strip_prefix(& [10]), Some(& [40, 30] [..]));
    assert_eq!(v.strip_prefix(& [10, 40]), Some(& [30] [..]));
    assert_eq!(v.strip_prefix(& [10, 40, 30]), Some(& [] [..]));
    assert_eq!(v.strip_prefix(& [50]), None);
    assert_eq!(v.strip_prefix(& [10, 50]), None);
    let prefix: &str = "he";
    assert_eq!(b"hello".strip_prefix(prefix.as_bytes()), Some(b"llo".as_ref()));
}