#6990: clear threading.local's key only after its thread state is removed:
fixes local subclasses leaving old state around after a ref cycle GC which
could be recycled by new locals
(backported from r75123)
diff --git a/Misc/NEWS b/Misc/NEWS
index 6b256b6..fff00dd 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -9,6 +9,12 @@
*Release date: XX-XXX-20XX*
+Core and builtins
+-----------------
+
+- Issue #6990: Fix threading.local subclasses leaving old state around
+ after a reference cycle GC which could be recycled by new locals.
+
Library
-------