Alexandre Vassalotti <alexan...@peadrop.com> added the comment:

> Why do you need all this? Isn't it enough to take a weakref and check
> the callback is triggered?

No, because you would need a weak reference to the instance's __dict__,
which is unavailable for io.StringIO.

Anyway, here's a simplified patch without the fun experimental code. :-)

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Added file: http://bugs.python.org/file14246/fix_refleak_stringio-3.diff

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