[Twisted-Python] Raising exception from a Deferred canceller.

[Terry Jones]

JP writes:

On Thu, Aug 29, 2013 at 1:00 PM, <exarkun at twistedmatrix.com> wrote:

> What about a third option - if a cancellation function raises an
> exception, fail the Deferred with that exception.


I really like this idea, but it wont work if the cancel function has
already fired the deferred.

Terry
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