[issue1061] ABC caches should use weak refs

[Guido van Rossum]

Guido van Rossum added the comment:

On 8/30/07, Thomas Wouters <report at bugs.python.org> wrote:
>
> Thomas Wouters added the comment:
>
> Here's a working version of that idea, with a WeakSet implementation I
> had lying around (but never really used.) It seems to work, and fixes
> the refcount issues, but the WeakSet could do with some extra tests ;-)

I was torturing the WeakSet implementation, but didn't get very far:

Python 3.0x (py3k, Aug 30 2007, 09:27:35)
[GCC 4.0.3 (Ubuntu 4.0.3-1ubuntu5)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from weakref import WeakSet as WS
[40407 refs]
>>> a = WS([1, 2, 3])
Fatal Python error: Cannot recover from stack overflow.
Aborted

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<http://bugs.python.org/issue1061>
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