From: Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com>
Date: Tue, 5 May 2026 15:25:23 +0000 (+0200)
Subject: [3.14] gh-149410: Test that `typing.NoDefault` is final (GH-149411) (#149419)
X-Git-Tag: v3.14.5~15
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=dd41f933200637c4cf7575daa42ed08c369e97f6;p=thirdparty%2FPython%2Fcpython.git

[3.14] gh-149410: Test that `typing.NoDefault` is final (GH-149411) (#149419)

gh-149410: Test that `typing.NoDefault` is final (GH-149411)
(cherry picked from commit bad9296fb0424bc480fa0ecfd2d60f73c33358f5)

Co-authored-by: sobolevn <mail@sobolevn.me>
---

diff --git a/Lib/test/test_typing.py b/Lib/test/test_typing.py
index 2c6a5c746603..2c99b221e52d 100644
--- a/Lib/test/test_typing.py
+++ b/Lib/test/test_typing.py
@@ -10859,6 +10859,10 @@ class NoDefaultTests(BaseTestCase):
         with self.assertRaises(AttributeError):
             type(NoDefault).foo
 
+    def test_no_subclassing(self):
+        with self.assertRaises(TypeError):
+            class Test(type(NoDefault)): ...
+
 
 class AllTests(BaseTestCase):
     """Tests for __all__."""