Here is the example code I am running:

```
import asyncio

class it:
	async def __aenter__(self):
		return self
	async def __aexit__(self, *_):
		print('EXIT')

async def main():
	async with it():
		await asyncio.sleep(100)

asyncio.get_event_loop().run_until_complete(main())
```


When this gets interrupted by a SIGINT, I would expect this code to display `EXIT` before the `KeyboardInterrupt` stacktrace. But instead the `__aexit__` function is simply not called.

Yes, this is a known limitation of asyncio -- keyboardinterrupt exceptions kills the loop rather abruptly. One way to handle this is to use 'signal.signal' for sigint to raise custom exception instead of keyboardinterrupt.

Ok, thank you. I'm guessing the patch I proposed in the PR is not an option, for my curiosity, why is that?