[issue34136] Del on class __annotations__ regressed, failing test

[Serhiy Storchaka]

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


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nosy: +Mark.Shannon, gvanrossum, levkivskyi

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue34136>
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