call site 1 for code.Traceback.__init__
code/testing/test_excinfo.py - line 101
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   def test_traceback_filter(self):
       traceback = self.excinfo.traceback
->     ntraceback = traceback.filter()
       assert len(ntraceback) == len(traceback) - 1
code/traceback2.py - line 150
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   def filter(self, fn=lambda x: not x.ishidden()):
       """ return a Traceback instance with certain items removed
   
               fn is a function that gets a single argument, a TracebackItem
               instance, and should return True when the item should be added
               to the Traceback, False when not
   
               by default this removes all the TracebackItems which are hidden
               (see ishidden() above)
           """
->     return Traceback(filter(fn, self))