Get the enclosing field from a class-type-nested.
(class-type-nested->enclosing x) → enclosing
This is an ordinary field accessor created by fty::defprod.
Function:
(defun class-type-nested->enclosing$inline (x) (declare (xargs :guard (class-typep x))) (declare (xargs :guard (equal (class-type-kind x) :nested))) (let ((__function__ 'class-type-nested->enclosing)) (declare (ignorable __function__)) (mbe :logic (b* ((x (and (equal (class-type-kind x) :nested) x))) (class-type-fix (std::da-nth 0 (cdr x)))) :exec (std::da-nth 0 (cdr x)))))
Theorem:
(defthm class-typep-of-class-type-nested->enclosing (b* ((enclosing (class-type-nested->enclosing$inline x))) (class-typep enclosing)) :rule-classes :rewrite)
Theorem:
(defthm class-type-nested->enclosing$inline-of-class-type-fix-x (equal (class-type-nested->enclosing$inline (class-type-fix x)) (class-type-nested->enclosing$inline x)))
Theorem:
(defthm class-type-nested->enclosing$inline-class-type-equiv-congruence-on-x (implies (class-type-equiv x x-equiv) (equal (class-type-nested->enclosing$inline x) (class-type-nested->enclosing$inline x-equiv))) :rule-classes :congruence)
Theorem:
(defthm class-type-nested->enclosing-when-wrong-kind (implies (not (equal (class-type-kind x) :nested)) (equal (class-type-nested->enclosing x) (class-type-fix nil))))