call site 3 for test.collect.Function.__ne__
test/testing/test_collect.py - line 398
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   def test_check_random_inequality():
       tmp = py.test.ensuretemp("ineq")
       tmp.ensure("test_x.py").write(py.code.Source("""def test_one():
           pass
       """))
       col = py.test.collect.Directory(tmp)
       fn = col._tryiter().next()
->     assert fn != 3
       assert fn != col
       assert fn != [1,2,3]
       assert [1,2,3] != fn
       assert col != fn