Golang: Wait group, channels, blocking operation

channels_blocking.go

package main

import (
	"fmt"
	"sync"
)

func main() {
	ch := make(chan int)
	wg := sync.WaitGroup{}
	go func() {
		for i := range ch {
			fmt.Println(i)
			fmt.Println("call")
			wg.Done()
		}
		fmt.Println("exit")
		wg.Done()
	}()
	wg.Add(3)
	ch <- 1
	ch <- 2
	close(ch)
	wg.Wait()
}