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• Position

Positionp

Recognizer for position structures.

Signature

(positionp x) → *

Definitions and Theorems

Function: positionp

(defun positionp (x)
  (declare (xargs :guard t))
  (and (consp x)
       (b* ((line (car x)) (column (cdr x)))
         (and (posp line) (natp column)))))

Theorem: consp-when-positionp

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