- enum-set-contains? enum-set enumprocedure
Returns #t if enum is a member of enum-set. It is an error if enum does not belong to the same enum type as the members of enum-set.
(enum-set-contains? color-set color-blue) ⇒ #t (enum-set-contains? (enum-set-delete! color-set color-blue) color-blue) ⇒ #f