module main

@[heap]
interface IGameObject {
mut:
    name       string
    parent     ?&IGameObject
    next       ?&IGameObject
    child      ?&IGameObject
    last_child ?&IGameObject
}

@[heap]
struct GameObject implements IGameObject {
mut:
    name       string
    parent     ?&IGameObject
    next       ?&IGameObject
    child      ?&IGameObject
    last_child ?&IGameObject
}

fn test_main() {
    mut v1 := &GameObject{
        name: 'v1'
    }
    v1.next = &GameObject{
        name: 'v2'
    }

    mut next := v1.next
    for {
        if mut next != none {
            eprintln(next.name)
            assert next.name == 'v2'
            next = next.next
        } else {
            break
        }
    }
    assert next == none
}