prunes Primus leave events on abnormal evaluation #1003
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Before this PR we were emitting the `leave-*` events even when a term didn't evaluate normally (but instead raised an exception). As a result event handlers were invoked in the context where the term was partially (if at all evaluate), while they were expecting that the evaluation was successful. This led to a few undefined variables and other errors. Even worse, since the `leave-*` events were posted in the exception handler, it was possible for the event handler to raise an exception on its own, which was escaping the original exception handler and breaking havoc and significantly affecting performance.
ivg
approved these changes
Oct 21, 2019
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Before this PR we were emitting the
leave-*events even when a termdidn't evaluate normally (but instead raised an exception). As a result
event handlers were invoked in the context where the term was partially
(if at all evaluate), while they were expecting that the evaluation was
successful. This led to a few undefined variables and other errors.
Even worse, since the
leave-*events were posted in the exceptionhandler, it was possible for the event handler to raise an exception on
its own, which was escaping the original exception handler and breaking
havoc and significantly affecting performance.