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