Fibonacci closure in Golang

fibonacci_closure.go

package main

import "fmt"

// fibonacci is a function that returns
// a function that returns an int.
func fibonacci() func() int {
	n_1, n := -1, 1
	return func() int {
		tmp := n
		n = n_1 + n
		n_1 = tmp

		return n
	}
}

func main() {
	f := fibonacci()
	for i := 0; i < 10; i++ {
		fmt.Println(f())
	}
}