def find_backwards(self, offset):
        try:
            for _, token_type, token_value in \
                    reversed(self.tokens[self.offset:offset]):
                if token_type in ('comment', 'linecomment'):
                    try:
                        prefix, comment = token_value.split(None, 1)
                    except __HOLE__:
                        continue
                    if prefix in self.comment_tags:
                        return [comment.rstrip()]
            return []
        finally:
            self.offset = offset
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/jinja2-2.6/jinja2/ext.py/_CommentFinder.find_backwards