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