code: def test_oo_optimized_datetime_index_unpickle():
      # GH 42866
      subprocess.check_call(
          [
              sys.executable,
              "-OO",
              "-c",
              (
                  "import pandas as pd, pickle; "
                  "pickle.loads(pickle.dumps(pd.date_range('2021-01-01', periods=1)))"
              ),
          ]
      )
  
imports: import array
  from functools import partial
  import subprocess
  import sys
  import numpy
  import pytest
  from pandas.errors import IntCastingNaNError
  import pandas
  from pandas import DataFrame, DatetimeIndex, Series, TimedeltaIndex
  import pandas._testing
  from pandas.core.arrays import DatetimeArray, TimedeltaArray
label_desc: Use image node_id 8 for calling a global function with example usage: test_oo_optimized_datetime_index_unpickle() without return types