[issue29655] Certain errors during IMPORT_STAR can leak a reference

[Serhiy Storchaka]

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


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nosy: +serhiy.storchaka
stage:  -> needs patch
type: behavior -> resource usage
versions: +Python 2.7, Python 3.5, Python 3.6

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29655>
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