AttributeError: 'generator' object has no attribute 'pend_throw' #244

As of commit 203cc48, I am getting an error in uasyncio.core (line 107) when using the uhttpd library. I have added two print lines for ret and cb, so the error is on actually line 107 as of that commit.

FDUSHIN> ret: <IORead object at 3fff6a10>
FDUSHIN> cb: <generator object 'start_server' at 3fff77d0>
Traceback (most recent call last):
File "main.py", line 14, in
File "neolamp/init.py", line 60, in run
File "uhttpd/init.py", line 70, in run
File "uhttpd/init.py", line 407, in run
File "uasyncio/core.py", line 140, in run_forever
File "uasyncio/core.py", line 109, in run_forever
AttributeError: 'generator' object has no attribute 'pend_throw'

I don't know how esoteric my usage of uasyncio.start_server is -- I am passing in a locally defined function, which is annotated with @asyncio.coroutine:

https://github.com/fadushin/esp8266/blob/master/micropython/uhttpd/uhttpd/__init__.py#L401

If you like, I can try to provide a simpler test case. I would not be surprised if I am abusing the library in some way.

Thank you!