Class ExitCM

Lib/test/test_contextlib_async.py:597–603

            self.assertIsNone(exc)
            self.assertIsNone(exc_tb)
        class ExitCM(object):
            def __init__(self, check_exc):
                self.check_exc = check_exc
            async def __aenter__(self):
                self.fail("Should not be called!")
            async def __aexit__(self, *exc_details):
                await self.check_exc(*exc_details)

        async with self.exit_stack() as stack:
            stack.push_async_exit(_expect_ok)