Get the kind (tag) of a natoption/natoptionlist-result structure.
(natoption/natoptionlist-result-kind x) → kind
Function:
(defun natoption/natoptionlist-result-kind$inline (x) (declare (xargs :guard (natoption/natoptionlist-resultp x))) (let ((__function__ 'natoption/natoptionlist-result-kind)) (declare (ignorable __function__)) (cond ((natoption/natoptionlist-p x) :ok) (t :err))))
Theorem:
(defthm natoption/natoptionlist-result-kind-possibilities (or (equal (natoption/natoptionlist-result-kind x) :ok) (equal (natoption/natoptionlist-result-kind x) :err)) :rule-classes ((:forward-chaining :trigger-terms ((natoption/natoptionlist-result-kind x)))))