Get the kind (tag) of a amb?-expr/tyname structure.
(amb?-expr/tyname-kind x) → kind
Function:
(defun amb?-expr/tyname-kind$inline (x) (declare (xargs :guard (amb?-expr/tyname-p x))) (let ((__function__ 'amb?-expr/tyname-kind)) (declare (ignorable __function__)) (mbe :logic (cond ((or (atom x) (eq (car x) :expr)) :expr) ((eq (car x) :tyname) :tyname) (t :ambig)) :exec (car x))))
Theorem:
(defthm amb?-expr/tyname-kind-possibilities (or (equal (amb?-expr/tyname-kind x) :expr) (equal (amb?-expr/tyname-kind x) :tyname) (equal (amb?-expr/tyname-kind x) :ambig)) :rule-classes ((:forward-chaining :trigger-terms ((amb?-expr/tyname-kind x)))))