call site 16 for test.raises
code/testing/test_excinfo.py - line 109
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   def test_traceback_recursion_index(self):
       def f(n):
           if n < 10:
               n += 1
           f(n)
->     excinfo = py.test.raises(RuntimeError, f, 8)
       traceback = excinfo.traceback 
       recindex = traceback.recursionindex() 
       assert recindex == 3