Get the fty::val field from a lexeme-option-some.
(lexeme-option-some->val x) → fty::val
This is an ordinary field accessor created by fty::defprod.
Function:
(defun lexeme-option-some->val$inline (x) (declare (xargs :guard (lexeme-optionp x))) (declare (xargs :guard x)) (let ((__function__ 'lexeme-option-some->val)) (declare (ignorable __function__)) (mbe :logic (b* ((x (and x x))) (lexeme-fix x)) :exec x)))
Theorem:
(defthm lexemep-of-lexeme-option-some->val (b* ((fty::val (lexeme-option-some->val$inline x))) (lexemep fty::val)) :rule-classes :rewrite)
Theorem:
(defthm lexeme-option-some->val$inline-of-lexeme-option-fix-x (equal (lexeme-option-some->val$inline (lexeme-option-fix x)) (lexeme-option-some->val$inline x)))
Theorem:
(defthm lexeme-option-some->val$inline-lexeme-option-equiv-congruence-on-x (implies (lexeme-option-equiv x x-equiv) (equal (lexeme-option-some->val$inline x) (lexeme-option-some->val$inline x-equiv))) :rule-classes :congruence)
Theorem:
(defthm lexeme-option-some->val-when-wrong-kind (implies (not x) (equal (lexeme-option-some->val x) (lexeme-fix nil))))