code: def test_struct_of_struct_loc():
      df = cudf.DataFrame({"col": [{"a": {"b": 1}}]})
      expect = cudf.Series([{"a": {"b": 1}}], name="col")
      assert_eq(expect, df["col"])
  
imports: import numpy
  import pandas
  import pyarrow
  import pytest
  import cudf
  from cudf.core.dtypes import StructDtype
  from cudf.testing._utils import DATETIME_TYPES, TIMEDELTA_TYPES, assert_eq
label_desc: Use image node_id 3 for calling a global function with example usage: test_struct_of_struct_loc() without return types