BUG: loc for ea index raising with oob slice end (#50170)

Author: phofl

doc/source/whatsnew/v2.0.0.rst

@@ -836,6 +836,7 @@ Indexing
 - Bug in :meth:`DataFrame.__setitem__` raising when indexer is a :class:`DataFrame` with ``boolean`` dtype (:issue:`47125`)
 - Bug in :meth:`DataFrame.reindex` filling with wrong values when indexing columns and index for ``uint`` dtypes (:issue:`48184`)
 - Bug in :meth:`DataFrame.loc` coercing dtypes when setting values with a list indexer (:issue:`49159`)
+- Bug in :meth:`Series.loc` raising error for out of bounds end of slice indexer (:issue:`50161`)
 - Bug in :meth:`DataFrame.loc` raising ``ValueError`` with ``bool`` indexer and :class:`MultiIndex` (:issue:`47687`)
 - Bug in :meth:`DataFrame.__setitem__` raising ``ValueError`` when right hand side is :class:`DataFrame` with :class:`MultiIndex` columns (:issue:`49121`)
 - Bug in :meth:`DataFrame.reindex` casting dtype to ``object`` when :class:`DataFrame` has single extension array column when re-indexing ``columns`` and ``index`` (:issue:`48190`)

pandas/core/indexes/base.py

@@ -6158,6 +6158,11 @@ def _maybe_cast_slice_bound(self, label, side: str_t):
         # We are a plain index here (sub-class override this method if they
         # wish to have special treatment for floats/ints, e.g. Float64Index and
         # datetimelike Indexes
+        # Special case numeric EA Indexes, since they are not handled by NumericIndex
+
+        if is_extension_array_dtype(self.dtype) and is_numeric_dtype(self.dtype):
+            return self._maybe_cast_indexer(label)
+
         # reject them, if index does not contain label
         if (is_float(label) or is_integer(label)) and label not in self:
             self._raise_invalid_indexer("slice", label)

pandas/tests/series/indexing/test_indexing.py

@@ -10,6 +10,7 @@
 from pandas import (
     NA,
     DataFrame,
+    Index,
     IndexSlice,
     MultiIndex,
     Series,
@@ -366,6 +367,14 @@ def test_loc_setitem_nested_data_enlargement():
     tm.assert_series_equal(ser, expected)
 
 
+def test_loc_ea_numeric_index_oob_slice_end():
+    # GH#50161
+    ser = Series(1, index=Index([0, 1, 2], dtype="Int64"))
+    result = ser.loc[2:3]
+    expected = Series(1, index=Index([2], dtype="Int64"))
+    tm.assert_series_equal(result, expected)
+
+
 def test_getitem_bool_int_key():
     # GH#48653
     ser = Series({True: 1, False: 0})