Having an asyncio enabled repr where a top-level "await" possible would be a huge productivity boost.  Using asyncio.run() in a REPL is hard, and besides it spawns a new event loop on every call.

The big idea: we want users to be able to do this:

    $ python -m asyncio

    >>> await asyncio.sleep(10, return='hello')
    # after 10 seconds
    hello