new
BitModifier(colonPunctuator: RequiredNode<Token>,bitKeyword: RequiredNode<Token>,openParenthesisPunctuator: RequiredNode<Token>,length: RequiredNode<NumberLiteral>,closeParenthesisPunctuator: RequiredNode<Token>,identifier: OptionalNode<Identifier>,assignmentOperator: OptionalNode<Token>,classId: RequiredNode<AbstractClassId>,children: Array<AbstractNode>,)