GeezerVison

import asyncio.staggered

async def main():
    async def asyncfn():
        pass

    await asyncio.staggered.staggered_race([asyncfn, asyncfn], delay=None)

main().__await__().send(None)

./python demo.py
Traceback (most recent call last):
  File "/home/graingert/projects/cpython/demo.py", line 9, in <module>
    main().__await__().send(None)
    ~~~~~~~~~~~~~~~~~~~~~~~^^^^^^
  File "/home/graingert/projects/cpython/demo.py", line 7, in main
    await asyncio.staggered.staggered_race([asyncfn, asyncfn], delay=None)
  File "/home/graingert/projects/cpython/Lib/asyncio/staggered.py", line 66, in staggered_race
    loop = loop or events.get_running_loop()
                   ~~~~~~~~~~~~~~~~~~~~~~~^^
RuntimeError: no running event loop

import asyncio.staggered

async def main(loop):
    async def asyncfn():
        print("hello")

    await asyncio.staggered.staggered_race([asyncfn, asyncfn], delay=None, loop=loop)
    return "world"

loop = asyncio.EventLoop()
coro = main(loop).__await__()
f = coro.send(None)
loop.run_until_complete(f)
try:
    coro.send(None)
except StopIteration as e:
    print(e.value)

./python demo.py
hello
world