[issue23209] asyncio: break some cycles

[STINNER Victor]

STINNER Victor added the comment:

I noticed that _ProactorBasePipeTransport doesn't clear its reference to the socket when it is closed. I changed this in the following commit (now merged in Python 3.4 & 3.5):
https://code.google.com/p/tulip/source/detail?r=61ce7def97272ab1a6488545dc392160c2fbe316

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<http://bugs.python.org/issue23209>
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