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Char-value

Char-valuep

Recognizer for char-value structures.

Signature
(char-valuep x) → *

Definitions and Theorems

Function: char-valuep

(defun char-valuep (x)
  (declare (xargs :guard t))
  (let ((__function__ 'char-valuep))
    (declare (ignorable __function__))
    (and (consp x)
         (eq (car x) :char)
         (true-listp (cdr x))
         (eql (len (cdr x)) 1)
         (b* ((nat (std::da-nth 0 (cdr x))))
           (ubyte16p nat)))))

Theorem: consp-when-char-valuep

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