call site 6 for code.ExceptionInfo.exconly
magic/testing/test_assertion.py - line 35
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   def test_assert_within_finally():
       class A:
           def f():
               pass
       excinfo = py.test.raises(TypeError, """
           try:
               A().f()
           finally:
               i = 42
       """)
->     s = excinfo.exconly() 
       assert s.find("takes no argument") != -1