Step to reproduce:

$ echo 'file("/some/file")' | python `which 2to3` -

(replace python with whichever python executable version you wish to
use, e.g. ~/python-trunk/python or /usr/local/bin/python3.2 )

Expected result:
Anything referring to the fact that the "file" type no longer exists in
python 3.x, whether it be a warning or a refactoring.

Actual result:
RefactoringTool: No files need to be modified.

Just a report for now, I don't have the time to write a patch.