golang 闭包求斐波那契数列

题目是Go指南中的闭包求斐波那契数列

package main

import "fmt"

// 返回一个“返回int的函数”
func fibonacci() func() int {
    var last = 0
    var cur = 1
    var count = 0
    return func() int {
        return func() int {
            switch count {
            case 0:
                count += 1
                return 0
            case 1:
                count += 1
                return 1
            default:
                last, cur = cur, last + cur
                count += 1
                return cur
            }
        }()
    }
}

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