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Keyword-uscores

Keyword-uscores-p

Recognizer for keyword-uscores structures.

Signature
(keyword-uscores-p x) → *

Definitions and Theorems

Function: keyword-uscores-p

(defun keyword-uscores-p (x)
  (declare (xargs :guard t))
  (and (consp x)
       (cond ((or (atom x) (eq (car x) :none))
              (and (eq (cdr x) nil) (b* nil t)))
             ((eq (car x) :start)
              (and (eq (cdr x) nil) (b* nil t)))
             (t (and (eq (car x) :both)
                     (and (eq (cdr x) nil))
                     (b* nil t))))))

Theorem: consp-when-keyword-uscores-p

(defthm consp-when-keyword-uscores-p
  (implies (keyword-uscores-p x)
           (consp x))
  :rule-classes :compound-recognizer)