[issue23209] asyncio: break some cycles

[Martin Richard]

Changes by Martin Richard <martius at martiusweb.net>:


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components: +asyncio
nosy: +gvanrossum, haypo, yselivanov
type:  -> performance
versions: +Python 3.4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue23209>
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