#![allow(dead_code, deprecated, unused_variables, unused_mut)]
use std::net::Ipv6Addr;
fn main() {
    assert_eq!(Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0x7f00, 0x1).is_loopback(), false);
    assert_eq!(
        Ipv6Addr::new(0, 0, 0, 0, 0, 0xffff, 0x7f00, 0x1).to_canonical().is_loopback(),
        true
    );
}