select_result::send_error() is not used anywhere. We need to investigate that to understand whether it was intentional (and the method can be removed), or not (and we now have bugs because of that).
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send_error() was only used to send the error message to the end user (with my_error()).
In allmost all cases this is just a wrapper for my_message()
It looks like we take care of the error handling in all send_eof() methods and we don't call send_error() anywhere, so it should be safe to remove this method.
(I did take a quick look at all send_eof() and send_error() methods and don't see any reason why we can't remove it)