tree 66e94a1ee027a077370df1bbd986a9c0730deba2
parent 57d4624c7ed43f313a6d2a0eb1fc2bf7241fa44a
author Paul J. Davis <paul.joseph.davis@gmail.com> 1561043771 -0500
committer Paul J. Davis <paul.joseph.davis@gmail.com> 1561064413 -0500

Mark futures as cancelled

This allows callers to cancel futures without having to worry about
receiving a `ready` message if the future completes before the
cancellation is applied.

Its possible that a message for this already in the callers message
queue. In which case you can call `cancel(Future, [flush])` to remove
that message.