JustAnotherArchivist <justanotherarchiv...@riseup.net> added the comment:

As another datapoint, this also broke some of my code on 3.8 because I was 
using `concurrent.futures.CancelledError` rather than `asyncio.CancelledError` 
to handle cancelled futures. And I'm certainly not the only one to have done 
this given that it's mentioned in at least two Stack Overflow answers: 
https://stackoverflow.com/a/38655063 and https://stackoverflow.com/a/36277556

While I understand the rationale behind this change, it would've been good to 
include this inheritance detail in the 3.8 release notes.

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nosy: +JustAnotherArchivist

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<https://bugs.python.org/issue32528>
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