Consider the following code:

import asyncio

q = asyncio.Queue()

async def main():
    await asyncio.gather(q.put(1), q.get(1))

asyncio.run(main())


This code just hangs since run() creates a loop but queue is bound with another (default) event loop.

The error is confusing and hard-to-debug.

We should raise a warning at least for the case; start from DeprecationWarning and make the system stricter later.

asyncio/locks.py is also affected since it has first-class classes (classes that instantiated by a user directly without factories).