[issue15578] Crash when modifying sys.modules during import

[R. David Murray]

R. David Murray added the comment:

If I remember correctly there were non-trivial improvements made to the way modules are finalized in 2.7 compared to earlier versions.  That could be what exposed the bug.  The pre-2.7 code might have been leaving another reference alive because of your more complex real world example, whereas the simplified example doesn't.

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nosy: +r.david.murray

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<http://bugs.python.org/issue15578>
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