[1.10.x] Fixed #24931 -- Made namespaced RegexURLResolvers populate callback strings.

Fixed a regression in 2f16ff5a6cbd71fc6c50e88e4087f3657222e90e.

Thanks Tim Graham for the review.

Backport of 625b8e9295d79650208bfb3fca8bf9e6aaf578e4 from master

1 files changed, 25 insertions, 0 deletions

diff --git a/tests/urlpatterns_reverse/nested_urls.py b/tests/urlpatterns_reverse/nested_urls.py
new file mode 100644
index 0000000000..f41b1449a8
--- /dev/null
+++ b/tests/urlpatterns_reverse/nested_urls.py
@@ -0,0 +1,25 @@
+from django.conf.urls import include, url
+from django.views import View
+
+
+def view1(request):
+    pass
+
+
+def view2(request):
+    pass
+
+
+class View3(View):
+    pass
+
+
+nested = ([
+    url(r'^view1/$', view1, name='view1'),
+    url(r'^view3/$', View3.as_view(), name='view3'),
+], 'backend')
+
+urlpatterns = [
+    url(r'^some/path/', include(nested, namespace='nested')),
+    url(r'^view2/$', view2, name='view2'),
+]