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Frame

Framep

Recognizer for frame structures.

Signature
(framep x) → *

Definitions and Theorems

Function: framep

(defun framep (x)
  (declare (xargs :guard t))
  (let ((__function__ 'framep))
    (declare (ignorable __function__))
    (and (consp x)
         (eq (car x) :frame)
         (true-listp (cdr x))
         (eql (len (cdr x)) 2)
         (b* ((term (std::da-nth 0 (cdr x)))
              (binding (std::da-nth 1 (cdr x))))
           (and (ttermp term)
                (bindingp binding))))))

Theorem: consp-when-framep

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