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Decdig/uscore

Decdig/uscore-kind

Get the kind (tag) of a decdig/uscore structure.

Signature
(decdig/uscore-kind x) → kind
Arguments: x — Guard (decdig/uscore-p x).

Definitions and Theorems

Function: decdig/uscore-kind$inline

(defun decdig/uscore-kind$inline (x)
  (declare (xargs :guard (decdig/uscore-p x)))
  (let ((__function__ 'decdig/uscore-kind))
    (declare (ignorable __function__))
    (mbe :logic (cond ((or (atom x) (eq (car x) :digit))
                       :digit)
                      (t :underscore))
         :exec (car x))))

Theorem: decdig/uscore-kind-possibilities

(defthm decdig/uscore-kind-possibilities
  (or (equal (decdig/uscore-kind x) :digit)
      (equal (decdig/uscore-kind x)
             :underscore))
  :rule-classes
  ((:forward-chaining :trigger-terms ((decdig/uscore-kind x)))))