[issue2705] incompatible change to warnings.showwarning

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

Is it a theoretical case or are you thinking about a specific library Y? 

Also, seeing some things break when a new Python version is released is
not new as you certainly know : see
http://twistedmatrix.com/trac/ticket/1867

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