def test_nan(self, space):
        w_res = space.execute("return 1.0.nan?")
        assert w_res in space.w_false
        w_res = space.execute("return Float::NAN.nan?")
        assert w_res is space.w_true
dataset/ETHPy150Open topazproject/topaz/tests/objects/test_floatobject.py/TestFloatObject.test_nan/operator `is` -> `in`