See the thread starting at https://mail.gna.org/public/relax-devel/2007-02/msg00003.html
(Message-id: <45DACFEA.7020108@...>) for a discussion of the issue.
The following varibles have been shifted from __builtin__ to the global namespace of the 'io' module
as only this module was accessing them:
bz2_module
bz2_module_message
devnull_import
devnull_import_message
