admin crashes on edit form pages since r6342

[sjulean@…]

Only r6327 of the newforms-admin is usable for me right now. Since r6342, attempting to edit an object results in the following error:

Traceback (most recent call last):
File "/home/sjulean/projects/django/django/core/handlers/base.py" in _real_get_response
  81. response = callback(request, *callback_args, **callback_kwargs)
File "/home/sjulean/projects/django/django/contrib/admin/sites.py" in root
  136. return self.model_page(request, *url.split('/', 2))
File "/home/sjulean/projects/django/django/contrib/admin/sites.py" in model_page
  153. return admin_obj(request, rest_of_url)
File "/home/sjulean/projects/django/django/contrib/admin/options.py" in __call__
  245. return self.add_view(request)
File "/home/sjulean/projects/django/django/contrib/admin/options.py" in add_view
  474. form = ModelForm(initial=request.GET)
File "/home/sjulean/projects/django/django/newforms/forms.py" in __init__
  81. self.fields = self.base_fields.copy()
File "/home/sjulean/projects/django/django/newforms/forms.py" in copy
  34. return SortedDictFromList([(k, copy.deepcopy(v)) for k, v in self.items()])
File "/home/sjulean/projects/django/django/newforms/fields.py" in __deepcopy__
  107. result.widget = copy.deepcopy(self.widget, memo)

  TypeError at /admin/auth/user/add/
  instancemethod expected at least 2 arguments, got 0

I can always reproduce this error by simply starting a new project, enabling the admin interface from settings and urls, doing a syncdb, and opening /admin/auth/user/add/.

[James Bennett]

Duplicate of #5505.