weird thing that happens when you try to create immutable arg function

wtf_args.go

package main

import (
	"os"
	"fmt"
)

func Args() []string{
	args := make([]string, len(os.Args), 100)
	fmt.Printf("os.Args: %v\n", os.Args)
	fmt.Printf("args: %v\n", args)
	fmt.Printf("copy: %v\n", copy(args, os.Args))
	fmt.Printf("os.Args: %v\n", os.Args)
	fmt.Printf("args: %v\n", args)
	os.Args = nil
	return args
}
func init() {
	_ = Args()
}

func main() {
	fmt.Printf("os.Args: %v\n", os.Args)
	fmt.Printf("Args(): %v\n", Args())
}