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Discovery from a module importing main doesn't make sense (although from a *script* importing main it does).
So long as "python -m unittest -v" continues to launch discovery, and the "positional argument" form of discovery still works, then the new patch looks good. I'll try it out and confirm.
In general I agree with Antoine, the best way to improve the implementation of unittest.main is to provide a new discovery script (with supporting code that is then much easier to extend).