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Linkage

Linkage-kind

Get the kind (tag) of a linkage structure.

Signature
(linkage-kind x) → kind
Arguments: x — Guard (linkagep x).

Definitions and Theorems

Function: linkage-kind$inline

(defun linkage-kind$inline (x)
  (declare (xargs :guard (linkagep x)))
  (let ((__function__ 'linkage-kind))
    (declare (ignorable __function__))
    (mbe :logic (cond ((or (atom x) (eq (car x) :external))
                       :external)
                      ((eq (car x) :internal) :internal)
                      (t :none))
         :exec (car x))))

Theorem: linkage-kind-possibilities

(defthm linkage-kind-possibilities
  (or (equal (linkage-kind x) :external)
      (equal (linkage-kind x) :internal)
      (equal (linkage-kind x) :none))
  :rule-classes
  ((:forward-chaining :trigger-terms ((linkage-kind x)))))