Check if an optional token may start an initializer optionally preceded by a designation.
(token-designation?-initializer-start-p token?) → yes/no
Since the designation is optional, we put together the starts of initializers and designations.
Function:
(defun token-designation?-initializer-start-p (token?) (declare (xargs :guard (token-optionp token?))) (let ((__function__ 'token-designation?-initializer-start-p)) (declare (ignorable __function__)) (or (token-designation-start-p token?) (token-initializer-start-p token?))))
Theorem:
(defthm booleanp-of-token-designation?-initializer-start-p (b* ((yes/no (token-designation?-initializer-start-p token?))) (booleanp yes/no)) :rule-classes :rewrite)
Theorem:
(defthm non-nil-when-token-designation?-initializer-start-p (implies (token-designation?-initializer-start-p token?) token?) :rule-classes :compound-recognizer)