The ticket page is here: https://code.djangoproject.com/ticket/16774

I previously said people trying to resolve URLs in their code may have 
difficulty because the DoesNotResolve exception is not raised until the 
view is run. Just now I thought how it would be done. I think changing 
resolver.url_patterns to return an iterator to a generator maybe the way to 
go?

resolver = urlresolvers.RegexURLResolver(r'^/', urlconf)
url_patterns = (pattern for pattern in resolver.url_patterns)
resolver = urlresolvers.RegexURLResolver(r'^/', url_patterns)

while response is None:
  callback, callback_args, callback_kwargs = resolver.resolve(
          request.path_info)
  try:
      response = callback(request, *callback_args, **callback_kwargs)
  except urlresolvers.DoesNotResolve:
      # Continue resolve URLs if the view raises 
      # urlresolvers.DoesNotResolve exception to indicate
      # the url pattern does not match.
      continue

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