golang fibonacci generator

fibonacci.go

package main

import (
    "fmt"
)

/*
 * fibonacci generator
 */
func fibonacci() func() int64 {
    var x, y, z int64 = 1, 1, 0
    return func() int64 {
        z, x, y = x, y, x+y
        return z
    }
}

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