;;; Rehash the sset when the proportion of free cells in the set is
;;; lower than this.
-(defconstant +sset-rehash-threshold+ 1/4)
+(eval-when (:compile-toplevel :load-toplevel :execute)
+ (defconstant +sset-rehash-threshold+ 1/4))
;;; Destructively add ELEMENT to SET. If ELEMENT was not in the set,
;;; then we return true, otherwise we return false.