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