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• Syntax

Vl-casekey-p

This is an ordinary defenum.

Function: vl-casekey-p

(defun vl-casekey-p (x)
  (declare (xargs :guard t))
  (or (eq x ':inside)
      (eq x ':matches)
      (eq x 'nil)))

Theorem: type-when-vl-casekey-p

(defthm type-when-vl-casekey-p
  (implies (vl-casekey-p x)
           (if (if (symbolp x)
                   (if (not (equal x 't))
                       (not (equal x 'nil))
                     'nil)
                 'nil)
               't
             (equal x 'nil)))
  :rule-classes :compound-recognizer)