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gen.with_timeout: Don't log CancelledError after timeout - #2681
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python/cpython#13528 broke us in two ways: asyncio.CancelledError is no longer an alias for concurrent.futures.CancelledError and it's now a BaseException. Fixes tornadoweb#2677 Closes tornadoweb#2681
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Hello!
I'm not very familiar with Tornado, but I'm investigating the failure on Python 3.8 (#2677).
From commit a237a99, it seems that CancelledError should also be ignored in
tornado.gen.with_timeout'serror_callback. Is that right?This fixed tests on Python 3.8.0b1 for me.