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Fix when yield from was made of an AnyType #8

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Fix when yield from was made of an AnyType #8

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@o11c o11c commented Oct 13, 2015

@rockneurotiko
Fix when yield from was made of an AnyType (python#868, the generic e…
45ff97a 
…xample

that @nierob reported in python#836)

Now don't crash in:

```
import asyncio

@asyncio.coroutine
def example_coro():
    q = asyncio.Queue()
    msg = yield from q.get()

if __name__ == '__main__':
    loop = asyncio.get_event_loop()
    loop.run_until_complete(example_coro())
```

But that example is because don't infer asyncio.Queue type properly as
is appointed in python#836, so q is AnyType

and

```
import asyncio
import typing

@asyncio.coroutine
def foo(a):
   b = yield from a
   return b
```
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@o11c @rockneurotiko