Failed example of accessible immutable ref from Nickel.rs

gistfile1.rs

#[macro_use]
extern crate nickel;

use nickel::Nickel;

struct MyObject;

impl MyObject {
    fn foo(&self) {}
}

fn serve(obj: &MyObject) {
    let mut server = Nickel::new();

    server.utilize(router! {
        get "/foo" => |_req, _res| {
            obj.foo();
        }
    });

    server.listen("127.0.0.1:6767");
}

fn main() {
    let obj: MyObject;
    serve(&obj);
}