From 29cb1d737e575f6441da1e8a3371ea2312fe5182 Mon Sep 17 00:00:00 2001
From: Guido van Rossum <guido@python.org>
Date: Fri, 14 Jun 2002 02:37:00 +0000
Subject: [PATCH] Test for the bug in recurse_down_subclasses() that I just
 fixed.

---
 Lib/test/test_descr.py | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/Lib/test/test_descr.py b/Lib/test/test_descr.py
index 5ef3f8c41a49..a526ad4769ff 100644
--- a/Lib/test/test_descr.py
+++ b/Lib/test/test_descr.py
@@ -2705,6 +2705,16 @@ def subclasspropagation():
     else:
         raise TestFailed, "d.foo should be undefined now"
 
+    # Test a nasty bug in recurse_down_subclasses()
+    import gc
+    class A(object):
+        pass
+    class B(A):
+        pass
+    del B
+    gc.collect()
+    A.__setitem__ = lambda *a: None # crash
+
 def buffer_inherit():
     import binascii
     # SF bug [#470040] ParseTuple t# vs subclasses.
-- 
2.47.3