Check if an optional token may start an initializer.
(token-initializer-start-p token?) → yes/no
An initializer is either an expression or something between curly braces.
Function:
(defun token-initializer-start-p (token?) (declare (xargs :guard (token-optionp token?))) (let ((__function__ 'token-initializer-start-p)) (declare (ignorable __function__)) (or (token-expression-start-p token?) (token-punctuatorp token? "{"))))
Theorem:
(defthm booleanp-of-token-initializer-start-p (b* ((yes/no (token-initializer-start-p token?))) (booleanp yes/no)) :rule-classes :rewrite)
Theorem:
(defthm non-nil-when-token-initializer-start-p (implies (token-initializer-start-p token?) token?) :rule-classes :compound-recognizer)