code: def test_setitem_ambiguous_keyerror(indexer_sl):
      s = Series(range(10), index=list(range(0, 20, 2)))
  
      # equivalent of an append
      s2 = s.copy()
      indexer_sl(s2)[1] = 5
      expected = concat([s, Series([5], index=[1])])
      tm.assert_series_equal(s2, expected)
  
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 13 for calling a global function with example usage: test_setitem_ambiguous_keyerror(indexer_sl) without return types