What is the purpose of the second nested <-done case in the code snippet
below?
Wouldn't the first <-done case handle the cancellation?
orDone := func(done, c <-chan interface{}) <-chan interface{} {
valStream := make(chan interface{})
go func() {
defer close(valStream)
for {
select {
case <-done: // first <-done case
return
case v, ok := <-c:
if ok == false {
return
}
select {
case valStream <- v:
case <-done: // why the second nested <-done case?
}
}
}
}
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