From e7f3e24eebd88a563d1dfaf6d6ac38a906abb4cb Mon Sep 17 00:00:00 2001
From: Guido van Rossum <guido@python.org>
Date: Fri, 14 Jun 2002 02:35:45 +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 1168106f89c7..852115be2164 100644
--- a/Lib/test/test_descr.py
+++ b/Lib/test/test_descr.py
@@ -2773,6 +2773,16 @@ def __getattr__(self, name):
     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.