Fixed #25466 -- Added backwards compatibility aliases for LoaderOrigin and StringOrigin.

Thanks Simon Charette for the DeprecationInstanceCheck class.

1 files changed, 11 insertions, 1 deletions

diff --git a/django/utils/deprecation.py b/django/utils/deprecation.py
index 33c384d1f8..905bbc4f6d 100644
--- a/django/utils/deprecation.py
+++ b/django/utils/deprecation.py
@@ -8,7 +8,8 @@ class RemovedInDjango20Warning(PendingDeprecationWarning):
     pass
 
 
-RemovedInNextVersionWarning = DeprecationWarning
+class RemovedInNextVersionWarning(DeprecationWarning):
+    pass
 
 
 class warn_about_renamed_method(object):
@@ -69,3 +70,12 @@ class RenameMethodsBase(type):
                     setattr(base, old_method_name, wrapper(new_method))
 
         return new_class
+
+
+class DeprecationInstanceCheck(type):
+    def __instancecheck__(self, instance):
+        warnings.warn(
+            "`%s` is deprecated, use `%s` instead." % (self.__name__, self.alternative),
+            self.deprecation_warning, 2
+        )
+        return super(DeprecationInstanceCheck, self).__instancecheck__(instance)