module main

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

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

struct Ship implements IGameObject {
    GameObject
    speed f32
}

fn test_main() {
    mut world := &GameObject{
        name: 'world'
    }
    mut ship := &Ship{
        name:   'ship'
        parent: world
    }
    assert '${ship}' == "&Ship{
    GameObject: GameObject{
        name: 'ship'
        parent: &Option(IGameObject(GameObject{
            name: 'world'
            parent: &Option(none)
        }))
    }
    speed: 0.0
}"
}