Fix parallel_map::execute_cancellation test #637
Merged
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As discovered in #635, the test here is racy. After resolving the
wait_for
it never actually executes cancellable work and so it might just finish computation without cancelling (the only place where it was able to cancel was when calling theinput.field(db)
call. This brings the test more in line with howparallel_execute
does it.