[issue21435] Segfault with cyclic reference and asyncio.Future

[Antoine Pitrou]

Antoine Pitrou added the comment:

Tim's analysis is spot on, and finalize3.patch looks good to me (there's some strange commenting style there - do the carets "^" mean something special?).

Still, I hope we can find a way to write a test case.

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<http://bugs.python.org/issue21435>
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