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Char-format

Char-formatp

Recognizer for char-format structures.

Signature
(char-formatp x) → *

Definitions and Theorems

Function: char-formatp

(defun char-formatp (x)
  (declare (xargs :guard t))
  (let ((__function__ 'char-formatp))
    (declare (ignorable __function__))
    (and (mbe :logic (and (alistp x)
                          (equal (strip-cars x) '(signedp)))
              :exec (fty::alist-with-carsp x '(signedp)))
         (b* ((signedp (cdr (std::da-nth 0 x))))
           (booleanp signedp)))))

Theorem: consp-when-char-formatp

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