[go-nuts] Is there any way to produce etcd watch chan be closed

[袁成若]

I met a problem about etcd watch channel. seems that be closed,  but i can 
not reproduce it.

like this: 

```
for {
     ach := etcdClientV3.Watch(context.Background(), "/test", 
clientv3.WithPrefix())
     for {
          select {
             case wch := <- ach {
                   fmt.Println("recv chan")    
             }
          }
     }
}
```
the program print recv chan all the time. but I cannot reproduce  it , Is 
there any way to reproduce it

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