testing nil channel

testnilchannel.go

package main

import (
        "fmt"
        "time"
)

func main() {
        var ch chan int

        go func() {
                for {
                        select {
                        case ch <- 10:
                                fmt.Println("Send successful.")
                        default:
                                time.Sleep(1 * time.Second)
                                fmt.Println("Waiting ...")
                        }
                }

        }()
        time.Sleep(2 * time.Second)
        ch = make(chan int)
        time.Sleep(4 * time.Second)
}