[issue9323] trace.py bug with the main file being traced

[Florent Xicluna]

Florent Xicluna <florent.xicluna at gmail.com> added the comment:

I've made the wrong assumption that test.regrtest.__file__ is always absolute.

Here is a patch which should fix it.

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nosy: +ezio.melotti
Added file: http://bugs.python.org/file18870/issue9323_regrtest.diff

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