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"""Backports from newer versions of the typing module.
We backport these features here so that Python can still build
while using an older Python version for PYTHON_FOR_REGEN.
"""
from typing import NoReturn
def assert_never(obj: NoReturn) -> NoReturn:
"""Statically assert that a line of code is unreachable.
Backport of typing.assert_never (introduced in Python 3.11).
"""
raise AssertionError(f"Expected code to be unreachable, but got: {obj}")
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