Recognizer for format-string structures.
(format-stringp x) → *
Function:
(defun format-stringp (x) (declare (xargs :guard t)) (let ((__function__ 'format-stringp)) (declare (ignorable __function__)) (and (consp x) (eq (car x) :format-string) (mbe :logic (and (alistp (cdr x)) (equal (strip-cars (cdr x)) '(elements))) :exec (fty::alist-with-carsp (cdr x) '(elements))) (b* ((elements (cdr (std::da-nth 0 (cdr x))))) (and (char/container-listp elements) (char/container-list-no-open/close-brace-p elements))))))
Theorem:
(defthm consp-when-format-stringp (implies (format-stringp x) (consp x)) :rule-classes :compound-recognizer)