#![allow(dead_code, deprecated, unused_variables, unused_mut)]
use std::net::{Ipv4Addr, Ipv6Addr};
fn main() {
    assert_eq!(
        Ipv4Addr::new(192, 0, 2, 255).to_ipv6_mapped(), Ipv6Addr::new(0, 0, 0, 0, 0,
        0xffff, 0xc000, 0x2ff)
    );
}