Passing channel over channel to do request & get response

channel.go

package main

import "fmt"

var queue = make(chan int)
var c = make(chan chan error)

func request() {
	for i := 0; i < 4; i++ {
		queue <- i
	}
	rsp := make(chan error)
	c <- rsp
	fmt.Printf("request: %v", <-rsp)
}

func response() {
	for {
		select {
		case val := <-queue:
			fmt.Printf("response: %v\n", val)
		case rsp := <-c:
			rsp <- fmt.Errorf("stop signal recieved")
			return
		}
	}
}

func main() {
	go response()
	request()
}