[issue24091] Use after free in Element.extend (1)

[Serhiy Storchaka]

Changes by Serhiy Storchaka <storchaka at gmail.com>:


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components: +Extension Modules, XML
nosy: +eli.bendersky, scoder, serhiy.storchaka

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue24091>
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