weakrefs and avoiding bad gc cycles

[Aaron Bentley]

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On 11-06-13 05:57 PM, Martin Pool wrote:
> When we want to for instance
> assert that something is definitely closed before the end of a test,
> there are better deterministic ways to do it without involving gc.

For objects where we do want to warn about failure to clean up, perhaps
they should register themselves with a singleton, and unregister on
cleanup?  Then we can ask the singleton whether any items still need
cleanup.

Aaron
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