For all purposes for which an exception has heretofore been necessary in criminal cases, it is sufficient that a party, at the time the ruling or order of the court is made or sought, makes known to the court the action which he desires the court to take or his objection to the action of the court and his grounds therefor. If a party has no opportunity to object to a ruling or order, the absence of an objection does not thereafter prejudice him. [PL 1965, c. 356, §64 (RPR).]