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Chars+exprs

Chars+exprs-p

Recognizer for chars+exprs structures.

Signature
(chars+exprs-p x) → *

Definitions and Theorems

Function: chars+exprs-p

(defun chars+exprs-p (x)
  (declare (xargs :guard t))
  (let ((__function__ 'chars+exprs-p))
    (declare (ignorable __function__))
    (and (consp x)
         (eq (car x) :chars+exprs)
         (mbe :logic (and (alistp (cdr x))
                          (equal (strip-cars (cdr x))
                                 '(chars exprs)))
              :exec (fty::alist-with-carsp (cdr x)
                                           '(chars exprs)))
         (b* ((chars (cdr (std::da-nth 0 (cdr x))))
              (exprs (cdr (std::da-nth 1 (cdr x)))))
           (and (char-listp chars)
                (expression-listp exprs))))))

Theorem: consp-when-chars+exprs-p

(defthm consp-when-chars+exprs-p
  (implies (chars+exprs-p x) (consp x))
  :rule-classes :compound-recognizer)