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