#![allow(dead_code, deprecated, unused_variables, unused_mut)]
use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};
fn main() {
    let localhost_v4 = IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1));
    let localhost_v6 = IpAddr::V6(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1));
    assert_eq!("127.0.0.1".parse(), Ok(localhost_v4));
    assert_eq!("::1".parse(), Ok(localhost_v6));
    assert_eq!(localhost_v4.is_ipv6(), false);
    assert_eq!(localhost_v4.is_ipv4(), true);
}