- Each of the ``repoze.bfg.view.render_view``,

  ``repoze.bfg.view.render_view_to_iterable``,
  ``repoze.bfg.view.render_view_to_response``,
  ``repoze.bfg.view.append_slash_notfound_view``,
  ``repoze.bfg.view.default_notfound_view``,
  ``repoze.bfg.view.default_forbidden_view``, and the
  ``repoze.bfg.configuration.rendered_response`` functions now expects
  to be called with a request object that has a ``registry`` attribute
  which represents the current ZCA registry.  This should only be a
  problem when passing a custom request object to code which ends up
  calling these functions in a unit test.  To retrofit tests that end
  up calling these functions which expect to be able to use a
  non-registry-aware request object, use the
  ``repoze.bfg.threadlocal.get_current_request`` API in the test to
  create the request; this will return a
  ``repoze.bfg.testing.DummyRequest`` that has the current registry as
  its ``registry`` attribute.  Alternatively, use the
  ``repoze.bfg.threadlocal.get_current_registry`` API: call this
  function and add an attribute to your unit test request object named
  ``registry`` with the result.

- The ``repoze.bfg.view.derive_view`` callable has been removed.  Use
  ``repoze.bfg.configuration.Configurator.derive_view`` instead (still
  not an API, however).

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