Deadlock on exception in call_later callback, during sleeping

[Alexey Shamrin]

The following deadlocks:

    @pytest.mark.trio
    async def test_raise_sleeping(self, loop):
        def raise_exc():
            raise Exception()

        async def raise_sleeping():
            loop.call_later(0.1, raise_exc)
            await asyncio.sleep(0.2)

        await trio_asyncio.aio_as_trio(raise_sleeping, loop=loop)()

It gets stuck in run_aio_future on wait_task_rescheduled after it hits abort_cb callback:

trio-asyncio/trio_asyncio/_util.py

Lines 34 to 45 in b93c320

 def abort_cb(raise_cancel_arg): 
     # Save the cancel-raising function 
     nonlocal raise_cancel 
     raise_cancel = raise_cancel_arg 
     # Attempt to cancel our future 
     future.cancel() 
     # Keep waiting 
     return trio.lowlevel.Abort.FAILED 
  
 try: 
     res = await trio.lowlevel.wait_task_rescheduled(abort_cb) 
     return res 

The problem exist at least since release 0.11.0.

#88 is potential similar.

(Extracted from #103.)