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Modifying constructor for event-advance structures.
(change-event-advance x
[:validator <validator>])
This is an often useful alternative to make-event-advance.
We construct a new event-advance structure that is a copy of
This is an ordinary
Macro:
(defmacro change-event-advance (x &rest args) (std::change-aggregate 'event-advance x args '((:validator . event-advance->validator)) 'change-event-advance 'nil))