module main

pub struct Message {
pub mut:
	text string = 'Init'
	m2   ?&Message
}

pub fn (mut m Message) update_text(new_text string) {
	m.text = new_text
}

pub fn (mut m Message) update_ext_text(new_text string) ? {
	m.m2?.text = new_text
}

type LocalMessageType = Message

interface IMessage {
mut:
	text string
	update_text(new_text string)
}

struct App {
mut:
	message &IMessage
}

pub fn (mut m LocalMessageType) update_text_externally(new_text string) {
	m.text = new_text
}

fn print_message(mut mdef IMessage) {
	if mut mdef is Message {
		mut a := LocalMessageType(*mdef)
		mut b := &LocalMessageType(mdef)
		mut c := LocalMessageType(mdef)

		dump(a)
		dump(b)
		dump(c)
	}
}

fn test_main() {
	mut m2 := &Message{
		text: 'Init External'
	}
	mut mdef := &Message{
		text: 'Init'
		m2:   m2
	}
	mut app := &App{
		message: mdef
	}
	print_message(mut app.message)
}