Guido van Rossum added the comment:

I'm afraid I no longer have all the details of this design in my head, and I 
have no idea what the fix does (and no time to read up on everything).

The OP says "If you do not await gather" -- what happens if you *do* await it? 
Do the tasks then get killed?

It seems strange to both cancel the task *and* set its exception.

The docstring for gather() seems to be pretty clear that cancellation and 
failure of one task should not affect other tasks. So this argues against the 
PR.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue31452>
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