[issue34970] Protect tasks weak set manipulation in asyncio.all_tasks()

[Ned Deily]

Ned Deily <nad at python.org> added the comment:

Released in 3.7.1

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priority: release blocker -> 
resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue34970>
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