545a942424a26c4163e1f959ac6130984fc3fb41,pandas/tests/reshape/concat/test_datetimes.py,TestDatetimeConcat,test_concat_multiindex_datetime_object_index,#TestDatetimeConcat#,131

Before Change

            index=MultiIndex.from_arrays(
                [
                    [1, 2],
                    Index([dt.date(2013, 1, 1), dt.date(2015, 1, 1)], dtype="object"),
                ],
                names=["first", "second"],
            ),

After Change

            index=MultiIndex.from_arrays(
                [
                    [1, 2],
                    idx[:-1],
                ],
                names=["first", "second"],
            ),

Instances