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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))
  (let ((__function__ 'positionp))
    (declare (ignorable __function__))
    (and (mbe :logic (and (alistp x)
                          (equal (strip-cars x) '(line column)))
              :exec (fty::alist-with-carsp x '(line column)))
         (b* ((line (cdr (std::da-nth 0 x)))
              (column (cdr (std::da-nth 1 x))))
           (and (posp line) (natp column))))))

Theorem: consp-when-positionp

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