From 320b39158ebfd63f25eb5f10dd65792334445eda Mon Sep 17 00:00:00 2001
From: Antoine Pitrou <solipsis@pitrou.net>
Date: Wed, 18 Dec 2013 00:28:36 +0100
Subject: Issue #20006: Fix sporadic failures in test_weakset.

---
 Lib/_weakrefset.py | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'Lib/_weakrefset.py')

diff --git a/Lib/_weakrefset.py b/Lib/_weakrefset.py
index 6a98b88e33..7f9923c634 100644
--- a/Lib/_weakrefset.py
+++ b/Lib/_weakrefset.py
@@ -60,6 +60,8 @@ class WeakSet:
             for itemref in self.data:
                 item = itemref()
                 if item is not None:
+                    # Caveat: the iterator will keep a strong reference to
+                    # `item` until it is resumed or closed.
                     yield item
 
     def __len__(self):
-- 
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