code: def test_can_hold_identifiers(idx):
      key = idx[0]
      assert idx._can_hold_identifiers_and_holds_name(key) is True
  
imports: import re
  import numpy
  import pytest
  from pandas._libs import index
  from pandas.core.dtypes.cast import construct_1d_object_array_from_listlike
  import pandas
  from pandas import Index, IntervalIndex, MultiIndex, RangeIndex
  import pandas._testing
label_desc: Use image node_id 12 for calling a global function with example usage: test_can_hold_identifiers(idx) without return types