call site 18 for code.ExceptionInfo.__init__
code/testing/test_excinfo.py - line 19
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   def test_excinfo_getstatement():
       def g():
           raise ValueError
       def f():
           g()
       try:
           f()
       except ValueError:
->         excinfo = py.code.ExceptionInfo()
       linenumbers = [f.func_code.co_firstlineno-1+3,
                      f.func_code.co_firstlineno-1+1,
                      g.func_code.co_firstlineno-1+1,]
       l = list(excinfo.traceback)
       foundlinenumbers = [x.lineno for x in l]
       print l[0].frame.statement
       assert foundlinenumbers == linenumbers