Weird error when trying to mock an external function

[keltia]

Rust: stable/1.60 on macOS 14.6 in a Mac Mini.

Hello, I'm trying to mock a function named lookup_addr which belongs to an external crape (dns-lookup) in order to avoid DNS resolution timeouts during tests, etc.

Trying the Trait approach, I get this:

    trait Lookup {
        fn lookup_addr(&self, ip: &IpAddr) -> Result<String, ()>;
    }

    fn lookup_addr(ip: &IpAddr) -> Result<String, ()> {
        let ip = ip.to_string();
        println!("BEEP");
        match ip.as_str() {
            "1.1.1.1" => Ok("one.one.one.one".into()),
            "2606:4700:4700::1111" => Ok("one.one.one.one".into()),
            "192.0.2.1" => Ok("some.host.invalid".into()),
            _ => Ok("blah".into()),
        }
    }

    mock_trait_no_default!(
        MockLookup,
        lookup_addr(&'static IpAddr) -> Result<String, ()>
    );

    impl Lookup for MockLookup {
        mock_method!(lookup_addr(&self, ip: &IpAddr) -> Result<String, ()>);
    }

    #[rstest]
    #[case("1.1.1.1", "one.one.one.one")]
    #[case("2606:4700:4700::1111", "one.one.one.one")]
    #[case("192.0.2.1", "some.host.invalid")]
    fn test_ip_solve(#[case] s: &str, #[case] p: &str) {
        let mock = MockLookup::new(Ok("foo.bar".to_owned()));

        let ptr = Ip::new(s).solve();
        assert_eq!(s.parse::<IpAddr>().unwrap(), ptr.ip);
        assert_eq!(p.to_string(), ptr.name);
    }

and it always barf with this error message:

error[E0308]: mismatched types
   --> src/ip.rs:175:9
    |
175 |         mock_method!(lookup_addr(&self, ip: &IpAddr) -> Result<String, ()>);
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `&std::net::IpAddr`, found enum `std::net::IpAddr`
    |
    = note: this error originates in the macro `mock_method` (in Nightly builds, run with -Z macro-backtrace for more info)

Any idea on what I'm doing wrong?

I also tried with mock_func_no_default!() but my custom function was never called.

Also, if I remove the &'static from the macro call abose, it complains that it expects a named lifetime.

Thx.