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