call site 3 for code.Traceback.recursionindex
code/testing/test_excinfo.py - line 128
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   def test_traceback_no_recursion_index(self):
       def do_stuff():
           raise RuntimeError
       def reraise_me():
           import sys
           exc, val, tb = sys.exc_info()
           raise exc, val, tb
       def f(n):
           try:
               do_stuff()
           except:
               reraise_me()
       excinfo = py.test.raises(RuntimeError, f, 8)
       traceback = excinfo.traceback 
->     recindex = traceback.recursionindex() 
       assert recindex is None