Get the value field from a data-item.
(data-item->value x) → value
This is an ordinary field accessor created by fty::defprod.
Function:
(defun data-item->value$inline (x) (declare (xargs :guard (data-item-p x))) (declare (xargs :guard t)) (let ((__function__ 'data-item->value)) (declare (ignorable __function__)) (mbe :logic (b* ((x (and t x))) (data-value-fix (cdr (std::da-nth 1 (cdr x))))) :exec (cdr (std::da-nth 1 (cdr x))))))
Theorem:
(defthm data-value-p-of-data-item->value (b* ((value (data-item->value$inline x))) (data-value-p value)) :rule-classes :rewrite)
Theorem:
(defthm data-item->value$inline-of-data-item-fix-x (equal (data-item->value$inline (data-item-fix x)) (data-item->value$inline x)))
Theorem:
(defthm data-item->value$inline-data-item-equiv-congruence-on-x (implies (data-item-equiv x x-equiv) (equal (data-item->value$inline x) (data-item->value$inline x-equiv))) :rule-classes :congruence)