'Option list item.'

def option_marker(self, match, context, next_state):

    try:
        (option_list_item, blank_finish) = self.option_list_item(match)
    except MarkupError as (message, lineno):
        self.invalid_input()
    self.parent += option_list_item
    self.blank_finish = blank_finish
    return ([], next_state, [])
