Following is a dangerous error-prone technique. If you use it in you program,
most likely you have a hidden bug, that will appear in high concurrency
situation.
```
func wait(c chan T) T {
v := <-c
c <- v;
return v;
}
```
I had proposal for future primitive: https://github.com/golang/go/issues/17466
, but looks like community doesn't agree with my intention.
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