How to use the awkward1.layout.ListOffsetArray64 function in awkward1

def descend(layout, depth):
            islistarray = isinstance(
                layout,
                (awkward1.layout.ListOffsetArray32, awkward1.layout.ListOffsetArray64,),
            )
            if islistarray and layout.content.parameter("collection_name") is not None:
                return lambda: layout

def nestedindex():
            # idx = awkward1.concatenate([idx[:, None] for idx in indexers], axis=1)
            n = len(indexers)
            out = numpy.empty(n * len(indexers[0]), dtype="int64")
            for i, idx in enumerate(indexers):
                out[i::n] = idx
            offsets = numpy.arange(0, len(out) + 1, n, dtype=numpy.int64)
            return awkward1.layout.ListOffsetArray64(
                awkward1.layout.Index64(offsets), awkward1.layout.NumpyArray(out),
            )