#![allow(dead_code, deprecated, unused_variables, unused_mut)]
use std::net::{Ipv4Addr, Ipv6Addr};
fn main() {
    assert_eq!(Ipv6Addr::new(0xff00, 0, 0, 0, 0, 0, 0, 0).to_ipv4_mapped(), None);
    assert_eq!(
        Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0xc00a, 0x2ff).to_ipv4_mapped(),
        Some(Ipv4Addr::new(192, 10, 2, 255))
    );
    assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1).to_ipv4_mapped(), None);
}