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Feat-bits

Feat-bitsp

Recognizer for feat-bits structures.

Signature
(feat-bitsp x) → *

Definitions and Theorems

Function: feat-bitsp

(defun feat-bitsp (x)
  (declare (xargs :guard t))
  (let ((__function__ 'feat-bitsp))
    (declare (ignorable __function__))
    (and (consp x)
         (cond ((or (atom x) (eq (car x) :|32|))
                (and (true-listp (cdr x))
                     (eql (len (cdr x)) 0)
                     (b* nil t)))
               (t (and (eq (car x) :|64|)
                       (and (true-listp (cdr x))
                            (eql (len (cdr x)) 0))
                       (b* nil t)))))))

Theorem: consp-when-feat-bitsp

(defthm consp-when-feat-bitsp
  (implies (feat-bitsp x) (consp x))
  :rule-classes :compound-recognizer)