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# BSD 3-Clause License; see https://github.com/scikit-hep/awkward/blob/main/LICENSE
from __future__ import annotations
import numpy as np
import pytest # noqa: F401
import awkward as ak
def test():
index_of_index = ak.highlevel.Array(
ak.contents.IndexedOptionArray.simplified(
ak.index.Index64(np.r_[0, 1, 2, -1]),
ak.contents.IndexedOptionArray(
ak.index.Index64(np.r_[0, -1, 2, 3]),
ak.contents.NumpyArray(np.r_[1, 2, 3, 4]),
),
)
)
mask = ak.operations.is_none(index_of_index)
assert mask.to_list() == [False, True, False, True]
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