Type of an item in an event control list.
Any particular atom in the event control list might have a
This is an ordinary defenum.
Function:
(defun vl-evatomtype-p (x) (declare (xargs :guard t)) (or (eq x ':vl-noedge) (eq x ':vl-edge) (eq x ':vl-posedge) (eq x ':vl-negedge)))
Theorem: type-when-vl-evatomtype-p
(defthm type-when-vl-evatomtype-p (implies (vl-evatomtype-p x) (if (symbolp x) (if (not (equal x 't)) (not (equal x 'nil)) 'nil) 'nil)) :rule-classes :compound-recognizer)