[go-nuts] How to drop old value in a channel salety

[陶青云]

```
// c  is buffered channel
select {
case c <- result:
default:
     // full, drop old one
      <-c
      c <- result
 }
```

I have a code like this,  but there may be a race condition in the default 
case. I enconter a
deadlock that the goroutine block on  'c<'.


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