code: def test_concat_mixed_list_types_error(s1, s2):
      s1, s2 = gd.Series(s1), gd.Series(s2)
  
      with pytest.raises(NotImplementedError):
          gd.concat([s1, s2], ignore_index=True)
  
imports: from decimal import Decimal
  import numpy
  import pandas
  import pytest
  import cudf
  from cudf.api.types import is_categorical_dtype
  from cudf.core._compat import PANDAS_GE_150, PANDAS_LT_140
  from cudf.core.dtypes import Decimal32Dtype, Decimal64Dtype, Decimal128Dtype
  from cudf.testing._utils import assert_eq, assert_exceptions_equal
label_desc: Use image node_id 50 for calling a global function with example usage: test_concat_mixed_list_types_error(s1, s2) without return types