		Search-engine friendly clone of the ACL2 documentation.

Const

Constp

Recognizer for const structures.

Signature
(constp x) → *

Definitions and Theorems

Function: constp

(defun constp (x)
  (declare (xargs :guard t))
  (and (consp x)
       (cond ((or (atom x) (eq (car x) :int))
              (and (b* ((unwrap (cdr x)))
                     (iconstp unwrap))))
             ((eq (car x) :float)
              (and (b* ((unwrap (cdr x)))
                     (fconstp unwrap))))
             ((eq (car x) :enum)
              (and (b* ((unwrap (cdr x)))
                     (identp unwrap))))
             (t (and (eq (car x) :char)
                     (and)
                     (b* ((unwrap (cdr x)))
                       (cconstp unwrap)))))))

Theorem: consp-when-constp

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