>>> import _zoneinfo
>>> with open("tzif_invalid_trans_idx", "rb") as f:
...     _zoneinfo.ZoneInfo.from_file(f)
...     
python: ./Modules/_zoneinfo.c:1152: load_data: Assertion `ttinfo_idx < self->num_ttinfos' failed.
Aborted                    (core dumped) /home/stan/dev/cpython/python

>>> import _zoneinfo
>>> with open("tzif_invalid_lookahead", "rb") as f:
...     _zoneinfo.ZoneInfo.from_file(f)
...     
Segmentation fault         (core dumped) /home/stan/dev/cpython/python