struct A;

trait T {
    fn f(&self);
    fn g(self);
}

impl T for A {
    fn f(&self) {
        println!("T::f()");
    }

    fn g(self) {
        println!("T::g()");
    }
}

impl T for &A {
    fn f(&self) {
        println!("(&T)::f()");
    }

    fn g(self) {
        println!("(&T)::g()");
    }
}

fn main() {
    let a1 = A;
    a1.f();
    a1.g();
    let a2 = &A;
    a2.f();
    a2.g();
    let a3 = &&A;
    a3.f();
    a3.g();
}