[issue32528] Change base class for futures.CancelledError

[Gustavo J. A. M. Carneiro]

Gustavo J. A. M. Carneiro <gjcarneiro at gmail.com> added the comment:

What a shame, I've seen this error many times as well.

Surely making it BaseException will not break that much code?...

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nosy: +gustavo

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