struct Abc {
mut:
	x int = 123
}

fn (mut s Abc) close() ? {
	println('> CLOSE 1 s.x: ${s.x}')
	s.x = -1
	println('> CLOSE 2 s.x: ${s.x}')
}

fn opt2() ?int {
	mut s := Abc{}
	dump(s.x)
	defer {
		s.close()?
	}
	return s.x
}

fn main() {
	println(opt2()?)
}