bpo-30508: Don't log exceptions if Task/Future "cancel()" method called #2050
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Python bug: http://bugs.python.org/issue30508
The problem is that if a Future or a Task has an exception wrapped into it, even if we explicitly call
.cancel()method, we print a traceback. We shouldn't do so, because callingcancel()is explicitly saying that I don't care about this Future/Task, I'm cancelling it to forget about it and its result.