call site 20 for code.Traceback.cut
code/testing/test_excinfo.py - line 96
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   def test_traceback_cut(self):
       co = py.code.Code(f)
       path, firstlineno = co.path, co.firstlineno 
       traceback = self.excinfo.traceback 
       newtraceback = traceback.cut(path=path, firstlineno=firstlineno)
       assert len(newtraceback) == 1
->     newtraceback = traceback.cut(path=path, lineno=firstlineno+2)
       assert len(newtraceback) == 1