struct Dumb {
mut:
	v []int
}

fn main() {
	a := Dumb{[1, 2, 3]}
	mut b := a.v // I expect a compiler error
	for _ in 0 .. 100 {
		b << [4, 5, 6]
	}
	println(a) // prints [4,5,6] in this case, but I've also seen crashes
}