subst-if-not
(subst-if-not new predicate tree &key key)
subst-if over the negated predicate: a subtree is replaced when the predicate REJECTS it. Deprecated by the standard.
(subst-if-not new predicate tree &key key)
subst-if over the negated predicate: a subtree is replaced when the predicate REJECTS it. Deprecated by the standard.