How to call a rust struct method in a Function?

[Phoenixkaze]

I'm holding a Lua instance in a struct. I want to call a method when a Function defined in rust is called in Lua.

I tried:

struct S {
    lua: Lua,
    // ...
}

impl S {
    fn new() -> S {
        let lua = Lua::new();
        let function = lua.create_function(|_, ()| {
            // do stuff
            // how to call self.f here?
            Ok(())
        }).unwrap();
        lua.globals.set("foo", function).unwrap();
        S { lua, ... }
    }
    fn f(&mut self) {
        // do stuff
    }
}

How to do this? Or any better way to do similar things ?