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