this is how we closure

closure.go

package main

func main() {
	var test closure

	test = foo
	for {
		test = test()
	}
}

type closure func() closure

func foo() closure {
	i := 0
	var bar closure
	bar = func() closure {
		print(i)
		i = i + 1
		if i > 3000 {
			return foo
		}
		return bar
	}
	return bar
}