code: def test_getitem_ambiguous_keyerror(indexer_sl):
      ser = Series(range(10), index=list(range(0, 20, 2)))
      with pytest.raises(KeyError, match=r"^1$"):
          indexer_sl(ser)[1]
  
imports: from datetime import timedelta
  import re
  import numpy
  import pytest
  from pandas.errors import IndexingError
  from pandas import NA, DataFrame, Index, IndexSlice, MultiIndex, NaT, Series, Timedelta, Timestamp, concat, date_range, isna, period_range, timedelta_range
  import pandas._testing
label_desc: Use image node_id 11 for calling a global function with example usage: test_getitem_ambiguous_keyerror(indexer_sl) without return types