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• Set

Sfix

Fixer for sets.

Signature

(sfix set) → set$

Arguments

set — Guard (setp set).

Returns

set$ — Type (setp set$).

Definitions and Theorems

Function: sfix

(defun sfix (set)
  (declare (xargs :guard (setp set)))
  (let ((__function__ 'sfix))
    (declare (ignorable __function__))
    (mbe :logic (if (setp set) set nil)
         :exec (the (or cons null) set))))

Theorem: setp-of-sfix

(defthm setp-of-sfix
  (b* ((set$ (sfix set))) (setp set$))
  :rule-classes :rewrite)