Function inner

src/trio/_core/_tests/test_run.py:1349–1352

(exc: BaseException)

            raise

    async def inner(exc: BaseException) -> None:
        with suppress(ValueError):
            await sleep_forever()
        assert not_none(sys.exc_info()[1]) is exc

    with pytest.RaisesGroup(
        pytest.RaisesExc(KeyError, check=lambda e: e.__context__ is None)