STINNER Victor added the comment:

> Hm. If the problem is most prominent with 3.3, why mark the issue as 3.6?

Well, I plan to implement this feature in "asyncio", so for 3.3-3.6 in fact.

> Do you have an implementation already?

Nope, it's more a TODO task for myself :-)

> Maybe it can be a 3rd party package rather than integrated in asyncio debug 
> mode?

Hum, I'm not sure. My idea is to add code in Future.set_exception() because I 
will probably need a reference to the exception object (and maybe to the Future 
object). Currently, it's not possible to replace the Future class (whereas we 
have BaseEventLoop.set_task_factory and BaseEventLoop.create_task). I don't 
think that it's worth to make it possible to replace/hook this class. I don't 
expect a huge complex code to detect reference cycles.

Please give me some weeks to investigate this issue. It will be easier to 
discuss with a working patch.

I opened the issue as a reminder for myself, but also to colaborate on it.

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<http://bugs.python.org/issue24598>
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