		Search-engine friendly clone of the ACL2 documentation.

File

Filep

Recognizer for file structures.

Signature
(filep x) → *

Definitions and Theorems

Function: filep

(defun filep (x)
  (declare (xargs :guard t))
  (let ((__function__ 'filep))
    (declare (ignorable __function__))
    (and (consp x)
         (eq (car x) :file)
         (mbe :logic (and (alistp (cdr x))
                          (equal (strip-cars (cdr x)) '(declons)))
              :exec (fty::alist-with-carsp (cdr x)
                                           '(declons)))
         (b* ((declons (cdr (std::da-nth 0 (cdr x)))))
           (ext-declon-listp declons)))))

Theorem: consp-when-filep

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