Refs #25466 -- Removed unused DeprecationInstanceCheck.

Unused since ff419de263138e905dff44c5cb806310c70f32aa.

2 files changed, 1 insertions, 27 deletions

diff --git a/django/utils/deprecation.py b/django/utils/deprecation.py
index 9d3c628f66..d690dc5d56 100644
--- a/django/utils/deprecation.py
+++ b/django/utils/deprecation.py
@@ -83,16 +83,6 @@ class RenameMethodsBase(type):
         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().__instancecheck__(instance)
-
-
 class MiddlewareMixin:
     sync_capable = True
     async_capable = True
diff --git a/tests/deprecation/tests.py b/tests/deprecation/tests.py
index b64691eb55..5548e90285 100644
--- a/tests/deprecation/tests.py
+++ b/tests/deprecation/tests.py
@@ -1,12 +1,7 @@
 import warnings
 
 from django.test import SimpleTestCase
-from django.utils.deprecation import (
-    DeprecationInstanceCheck,
-    RemovedAfterNextVersionWarning,
-    RemovedInNextVersionWarning,
-    RenameMethodsBase,
-)
+from django.utils.deprecation import RemovedAfterNextVersionWarning, RenameMethodsBase
 
 
 class RenameManagerMethods(RenameMethodsBase):
@@ -166,14 +161,3 @@ class RenameMethodsTests(SimpleTestCase):
         self.assertTrue(
             issubclass(RemovedAfterNextVersionWarning, PendingDeprecationWarning)
         )
-
-
-class DeprecationInstanceCheckTest(SimpleTestCase):
-    def test_warning(self):
-        class Manager(metaclass=DeprecationInstanceCheck):
-            alternative = "fake.path.Foo"
-            deprecation_warning = RemovedInNextVersionWarning
-
-        msg = "`Manager` is deprecated, use `fake.path.Foo` instead."
-        with self.assertWarnsMessage(RemovedInNextVersionWarning, msg):
-            isinstance(object, Manager)