usayncio: TypeError: exceptions must derive from BaseException

I have written some code that uses the asyncio module. The entrypoint point to my code looks like this:

try:
    control.main()
except KeyboardInterrupt:
    pass
except Exception as exc:
    sys.print_exception(exc)
    print('* resetting in 10 seconds')
    time.sleep(10)
    machine.reset()

And control.main looks like:

def main():
    [...]

    try:
        loop.run_forever()
        loop.close()
    finally:
        for task in tasklist:
            task.close()

I just upgraded to the version in micropython-lib as of 9e21d6e, and now when I interrupt my code with ^C I see the following error:

Traceback (most recent call last):
  File "snakecharmer/main.py", line 10, in <module>
  File "snakecharmer/control.py", line 52, in main
  File "uasyncio/__init__.py", line 246, in start_server
TypeError: exceptions must derive from BaseException

That seems to correspond to the following line in uasyncio/__init__.py:

yield IORead(s)

What's going on here?

Inizia da uasyncio/init.py alla riga 246 indicata, quindi segui il modo in cui control.py:main e snakecharmer/main.py gestiscono Ctrl-C. Confronta il comportamento prima e dopo la revisione 9e21d6e di micropython-lib. Il lavoro è completato quando hai spiegato perché l'interruzione raggiunge questo errore e hai identificato la modifica o la correzione interessata.