[Go]Fibonacci closure

Version #2 "Go" Version

package main

import "fmt"

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

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

Version #1 "Java" Version
package main

import "fmt"

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

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