struct Test2 {}

struct Test3 {}

type Test = Test2 | Test3

fn (f Test) test(t ?Test) {
	$dbg;
}

fn (f Test) test2(t ?&Test) {
	$dbg;
}

fn test_int(a ?int) {
	$dbg;
}

fn main() {
	mut a := ?Test(Test2{})
	a?.test(a)

	test_int(?int(none))
	test_int(?int(1))

	b := ?&Test(none)
	a?.test2(b)
}