[issue22988] No error when yielding from `finally`

[Ethan Furman]

Changes by Ethan Furman <ethan at stoneleaf.us>:


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nosy: +ethan.furman, giampaolo.rodola, gvanrossum, haypo, pitrou, yselivanov

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue22988>
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