call site 16 for code.Traceback.__getitem__
code/testing/test_excinfo.py - line 86
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   def test_traceback_entry_getsource_in_construct(self):
       source = py.code.Source("""\
               def xyz():
                   try:
                       raise ValueError
                   except somenoname:
                       pass
               xyz()
           """) 
       try: 
           exec source.compile()
       except NameError: 
           tb = py.code.ExceptionInfo().traceback 
           print tb[-1].getsource()
->         s = str(tb[-1].getsource())
           assert s.startswith("def xyz():\n    try:")
           assert s.endswith("except somenoname:")