How to use the vine.Thenable.register function in vine

class Headers(dict):
    """Represents a mapping of HTTP headers."""

    # TODO: This is just a regular dict and will not perform normalization
    # when looking up keys etc.

    #: Set when all of the headers have been read.
    complete = False

    #: Internal attribute used to keep track of continuation lines.
    _prev_key = None


@Thenable.register
@python_2_unicode_compatible
class Request(object):
    """A HTTP Request.

    Arguments:
        url (str): The URL to request.
        method (str): The HTTP method to use (defaults to ``GET``).

    Keyword Arguments:
        headers (Dict, ~kombu.asynchronous.http.Headers): Optional headers for
            this request
        body (str): Optional body for this request.
        connect_timeout (float): Connection timeout in float seconds
            Default is 30.0.
        timeout (float): Time in float seconds before the request times out
            Default is 30.0.

reset_value = task_join_will_block()
    _set_task_join_will_block(True)
    try:
        yield
    finally:
        _set_task_join_will_block(reset_value)


class ResultBase(object):
    """Base class for results."""

    #: Parent result (if part of a chain)
    parent = None


@Thenable.register
@python_2_unicode_compatible
class AsyncResult(ResultBase):
    """Query task state.

    Arguments:
        id (str): See :attr:`id`.
        backend (Backend): See :attr:`backend`.
    """

    app = None

    #: Error raised for timeouts.
    TimeoutError = TimeoutError

    #: The task's UUID.
    id = None