[6.0.x] Fixed #36903 -- Fixed further NameErrors when inspecting functions with deferred annotations.

Provide a wrapper for safe introspection of user functions on Python 3.14+.

Follow-up to 601914722956cc41f1f2c53972d669ddee6ffc04.
Backport of 56ed37e17e5b1a509aa68a0c797dcff34fcc1366 from main.

3 files changed, 47 insertions, 0 deletions

diff --git a/tests/check_framework/test_security.py b/tests/check_framework/test_security.py
index d5cc8a9ad6..0f03845c15 100644
--- a/tests/check_framework/test_security.py
+++ b/tests/check_framework/test_security.py
@@ -1,4 +1,6 @@
 import itertools
+import unittest
+from typing import TYPE_CHECKING
 
 from django.conf import settings
 from django.core.checks.messages import Error, Warning
@@ -6,8 +8,12 @@ from django.core.checks.security import base, csrf, sessions
 from django.core.management.utils import get_random_secret_key
 from django.test import SimpleTestCase
 from django.test.utils import override_settings
+from django.utils.version import PY314
 from django.views.generic import View
 
+if TYPE_CHECKING:
+    from django.http.request import HttpRequest
+
 
 class CheckSessionCookieSecureTest(SimpleTestCase):
     @override_settings(
@@ -613,6 +619,12 @@ def failure_view_with_invalid_signature():
     pass
 
 
+if PY314:
+
+    def failure_view_with_deferred_annotations(request: HttpRequest, reason: str):
+        pass
+
+
 good_class_based_csrf_failure_view = View.as_view()
 
 
@@ -653,6 +665,15 @@ class CSRFFailureViewTest(SimpleTestCase):
     def test_failure_view_valid_class_based(self):
         self.assertEqual(csrf.check_csrf_failure_view(None), [])
 
+    @unittest.skipUnless(PY314, "Deferred annotations are Python 3.14+ only")
+    @override_settings(
+        CSRF_FAILURE_VIEW=(
+            "check_framework.test_security.failure_view_with_deferred_annotations"
+        ),
+    )
+    def test_failure_view_valid_deferred_annotations(self):
+        self.assertEqual(csrf.check_csrf_failure_view(None), [])
+
 
 class CheckCrossOriginOpenerPolicyTest(SimpleTestCase):
     @override_settings(
diff --git a/tests/check_framework/test_urls.py b/tests/check_framework/test_urls.py
index a3b219f3a4..5164fe7671 100644
--- a/tests/check_framework/test_urls.py
+++ b/tests/check_framework/test_urls.py
@@ -1,3 +1,5 @@
+import unittest
+
 from django.conf import settings
 from django.core.checks.messages import Error, Warning
 from django.core.checks.urls import (
@@ -10,6 +12,7 @@ from django.core.checks.urls import (
 )
 from django.test import SimpleTestCase
 from django.test.utils import override_settings
+from django.utils.version import PY314
 
 
 class CheckUrlConfigTests(SimpleTestCase):
@@ -323,6 +326,14 @@ class CheckCustomErrorHandlersTests(SimpleTestCase):
         result = check_custom_error_handlers(None)
         self.assertEqual(result, [])
 
+    @unittest.skipUnless(PY314, "Deferred annotations are Python 3.14+ only")
+    @override_settings(
+        ROOT_URLCONF="check_framework.urls.good_error_handler_deferred_annotations",
+    )
+    def test_good_function_based_handlers_deferred_annotations(self):
+        result = check_custom_error_handlers(None)
+        self.assertEqual(result, [])
+
     @override_settings(
         ROOT_URLCONF="check_framework.urls.good_class_based_error_handlers",
     )
diff --git a/tests/check_framework/urls/good_error_handler_deferred_annotations.py b/tests/check_framework/urls/good_error_handler_deferred_annotations.py
new file mode 100644
index 0000000000..8b4ead5566
--- /dev/null
+++ b/tests/check_framework/urls/good_error_handler_deferred_annotations.py
@@ -0,0 +1,15 @@
+from typing import TYPE_CHECKING
+
+if TYPE_CHECKING:
+    from django.http.request import HttpRequest
+
+urlpatterns = []
+
+handler400 = __name__ + ".good_handler_deferred_annotations"
+handler403 = __name__ + ".good_handler_deferred_annotations"
+handler404 = __name__ + ".good_handler_deferred_annotations"
+handler500 = __name__ + ".good_handler_deferred_annotations"
+
+
+def good_handler_deferred_annotations(request: HttpRequest, exception=None):
+    pass