func print_i64[x: I64] : I64
    printf("%ld\n", x)

func I64.to_string[n: I64] : String
    let x: String = malloc(21)
    sprintf(x, "%ld", n)
    return x

func main[] : I64
    let s: String = I64.to_string(58394)
    print_i64(strlen(s))
    free(s)