fn my_fn() {
	a := 1
	f1 := fn [a] () {
		a++
		println(a)
	}
	f2 := fn [mut a] () {
		a++
		println(a)
	}
	mut b := 2
	f3 := fn [b] () {
		b++
		println(b)
	}
	f1()
	f2()
	f3()
}