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We fixed our bug days ago, but I would have expected [*gen] to have triggered an exception before it even got to gather().
The real code was something like:
>>> l = (ensure_awaitable(callable_obj) for callable_obj in callable_list)
>>> gather(*l)
ensure_awaitable() is just using inspect to turn coroutine functions into coroutines, and wraps non coroutine callables with asyncio.coroutine(callable)().
In the end, ensure_awaitable did raise TypeError if the argument passed was not a callable.