A Go program that will panic

mul-chan.go

package main

import (
	"strconv"
	"sync"
)

func main() {
	channel := make(chan string, 20)
	wg := sync.WaitGroup{}
	wg.Add(3)
	go writeA(channel, &wg)
	go writeB(channel, &wg)
	go read(channel, &wg)
	wg.Wait()
}

func writeA(channel chan<- string, wg *sync.WaitGroup) {
	for i := 0; i < 10; i++ {
		channel <- strconv.Itoa(i) + " sent from A"
	}
	close(channel)
	wg.Done()
}

func writeB(channel chan<- string, wg *sync.WaitGroup) {
	for i := 0; i < 10; i++ {
		channel <- strconv.Itoa(i) + " sent from B"
	}
	close(channel)
	wg.Done()
}

func read(channel <-chan string, wg *sync.WaitGroup) {
	for str := range channel {
		print(str, "\n")
	}
	wg.Done()
}