Warn about creating global variables by __setattr__ that shadow builtin
names. Unfortunately, this is not bulletproof since the module
dictionary can be modified directly.
diff --git a/Misc/NEWS b/Misc/NEWS
index 6c9f5e5..35b35b8 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -43,6 +43,12 @@
instead of going through __getitem__. If __getitem__ access is
preferred, then __iter__ can be overriden.
+- Creating an attribute on a module (i.e. a global variable created by
+ __setattr__) that causes a builtin name to be shadowed now raises a
+ DeprecationWarning. In future versions of Python the effect may be
+ undefined (in order to allow for optimization of global and builtin
+ name lookups).
+
Extension modules
-----------------