Why don't you rewrite that in rust?

    use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};
    let localhost_v6 = IpAddr::V6(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1));
    assert_eq!("::1".parse(), Ok(localhost_v6));