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C-char

C-char-p

Recognizer for c-char structures.

Signature
(c-char-p x) → *

Definitions and Theorems

Function: c-char-p

(defun c-char-p (x)
  (declare (xargs :guard t))
  (and (consp x)
       (cond ((or (atom x) (eq (car x) :char))
              (and (b* ((code (cdr x))) (natp code))))
             (t (and (eq (car x) :escape)
                     (and)
                     (b* ((escape (cdr x)))
                       (escapep escape)))))))

Theorem: consp-when-c-char-p

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