def METHOD_NAME(self):
    s = arith_expr.Slice.CreateNull(alloc_lists=True)
    s.a = arith_expr.Var('foo')
    self.assertEqual(None, s.begin)
    self.assertEqual(None, s.end)
    self.assertEqual(None, s.stride)
    print(s)
    func = arith_expr.FuncCall.CreateNull(alloc_lists=True)
    func.name = 'f'
    self.assertEqual([], func.args)
    print(func)