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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 (mbe :logic (and (alistp x)
                          (equal (strip-cars x)
                                 '(function scopes)))
              :exec (fty::alist-with-carsp x '(function scopes)))
         (b* ((function (cdr (std::da-nth 0 x)))
              (scopes (cdr (std::da-nth 1 x))))
           (and (identp function)
                (scope-listp scopes)
                (consp scopes))))))

Theorem: consp-when-framep

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