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Vl-stream

Vl-leftright-p

The direction for streaming operators: :left for << or :right for >>.

This is an ordinary defenum.

Function: vl-leftright-p

(defun vl-leftright-p (x)
  (declare (xargs :guard t))
  (or (eq x ':left) (eq x ':right)))

Theorem: type-when-vl-leftright-p

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