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Golangで順列

package main

import "fmt"

func perm(head []int, rest []int) {
    if len(rest) == 0 {
        fmt.Println(head)

    } else {
        for i, v := range rest {

            restx := make([]int, len(rest))
            copy(restx, rest)

            restx = append(restx[:i], restx[i+1:]...)
            headx := append(head, v)

            perm(headx, restx)
        }
    }
}

func main() {
    perm([]int{}, []int{1, 2, 3})
}