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16 lines
467 B
Python
16 lines
467 B
Python
import enum
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from typing import Any, NoReturn
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class _Impossible(enum.Enum):
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pass
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def assert_impossible(arg: NoReturn) -> NoReturn:
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raise Exception(f"unexpected arg received: {type(arg)} {arg}")
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# mypy is not yet smart enough to do exhaustiveness checking on literal types,
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# so this will fail at runtime instead of typecheck time :-(
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def assert_impossible_literal(arg: Any) -> NoReturn:
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raise Exception(f"unexpected arg received: {type(arg)} {arg}")
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