I'm not so sure. The bug was that when an exception occurred while select was blocked then select did not properly clean up after itself. But no code in select

I'm not so sure. The bug was that when an exception occurred while select was blocked then select did not properly clean up after itself. But no code in select actually dealt with exceptions at all, so handling it doesn't really make sense. Without exceptions the possible control flow is entirely explicit. It would have at least been obvious that cleanup wasn't properly handled in the select function for all cases.