go_concurrency.say_hello_6.main.go

package main

import (
	"fmt"
	"sync"
)

func main() {
	wg := sync.WaitGroup{}
	wg.Add(1)

	greet := "Hello world!" // We have moved the "Hello world!" string to a variable, greet

	go func(){
		fmt.Println(greet)

		wg.Done()
	}()

	greet = "こんにちは世界!" // We are changing the value of greet, before wg.Wait()
	wg.Wait()
}