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• Char+position

Char+position-p

Recognizer for char+position structures.

Signature

(char+position-p x) → *

Definitions and Theorems

Function: char+position-p

(defun char+position-p (x)
  (declare (xargs :guard t))
  (and (consp x)
       (b* ((char (car x)) (position (cdr x)))
         (and (natp char)
              (positionp position)))))

Theorem: consp-when-char+position-p

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