My GoTour Exercise #47 (http://tour.golang.org/#47) solution

gistfile1.go

package main

import "fmt"

// fibonacci is a function that returns
// a function that returns an int.
func fibonacci() func() int {
  curr := 0
  succ := 1
  return func() int {
    curr, succ = succ, curr + succ
    return curr
  }
}

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