Essentially SF patch 1061679:  add missing __all__ to pickletools.py.
Harmless.
diff --git a/Misc/NEWS b/Misc/NEWS
index a472fea..1970900 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -26,6 +26,8 @@
   attempt is made to execute the remaining handlers.  The last exception
   raised is re-raised.
 
+- Patch 1061679: Added `__all__` to pickletools.py.
+
 Build
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