Get the char field from a char+position.
(char+position->char x) → char
This is an ordinary field accessor created by fty::defprod.
Function:
(defun char+position->char$inline (x) (declare (xargs :guard (char+position-p x))) (declare (xargs :guard t)) (let ((__function__ 'char+position->char)) (declare (ignorable __function__)) (mbe :logic (b* ((x (and t x))) (nfix (cdr (std::da-nth 0 x)))) :exec (cdr (std::da-nth 0 x)))))
Theorem:
(defthm natp-of-char+position->char (b* ((char (char+position->char$inline x))) (natp char)) :rule-classes :rewrite)
Theorem:
(defthm char+position->char$inline-of-char+position-fix-x (equal (char+position->char$inline (char+position-fix x)) (char+position->char$inline x)))
Theorem:
(defthm char+position->char$inline-char+position-equiv-congruence-on-x (implies (char+position-equiv x x-equiv) (equal (char+position->char$inline x) (char+position->char$inline x-equiv))) :rule-classes :congruence)