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Vls-commandtype-p

This is an ordinary defenum.

Function: vls-commandtype-p

(defun vls-commandtype-p (x)
  (declare (xargs :guard t))
  (or (eq x ':json) (eq x ':html)))

Theorem: type-when-vls-commandtype-p

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