allocaして欲しかった.go

package main

import(
    "fmt"
    "math/rand"
    "time"
)

func main() {
    rand.Seed(time.Now().UnixNano())
    var l = rand.Intn(10)
    a := make([]int, l)
    a[l-1] = 3
    fmt.Printf("Hello world\n")
}