Never fails. If there's a valid
(vl-parse-optional-drive-strength &key (tokstream 'tokstream) (config 'config)) → (mv errmsg? value new-tokstream)
Function:
(defun vl-parse-optional-drive-strength-fn (tokstream config) (declare (xargs :stobjs (tokstream))) (declare (xargs :guard (vl-loadconfig-p config))) (declare (ignorable config)) (let ((__function__ 'vl-parse-optional-drive-strength)) (declare (ignorable __function__)) (b* ((backup (vl-tokstream-save)) ((mv erp val tokstream) (vl-parse-drive-strength)) ((unless erp) (mv erp val tokstream)) (tokstream (vl-tokstream-restore backup))) (mv nil nil tokstream))))
Theorem:
(defthm vl-parse-optional-drive-strength-never-fails (not (mv-nth 0 (vl-parse-optional-drive-strength))))
Theorem:
(defthm vl-parse-optional-drive-strength-result (implies (and (not (mv-nth 0 (vl-parse-optional-drive-strength))) (and t)) (vl-maybe-gatestrength-p (mv-nth 1 (vl-parse-optional-drive-strength)))))
Theorem:
(defthm vl-parse-optional-drive-strength-count-strong-on-value (and (<= (vl-tokstream-measure :tokstream (mv-nth 2 (vl-parse-optional-drive-strength))) (vl-tokstream-measure)) (implies (mv-nth 1 (vl-parse-optional-drive-strength)) (< (vl-tokstream-measure :tokstream (mv-nth 2 (vl-parse-optional-drive-strength))) (vl-tokstream-measure)))) :rule-classes ((:rewrite) (:linear)))