[3.0.0beta1] Crash on allSucceded

[piercifani]

Hey guys!

I'm experiencing a crash on allSucceded where it's crashing on calling adoptChild(_:orphaned:pendingCount:) on NSProgress. The exception states that the reason is: NSProgress 0x60000032fbe0 was already the child of another progress 0x60800032abe0'

I can reproduce it 100% of the time on my code but I couldn't make it crash using a simpler project.

[zwaldowski]

Investigating, thanks! allSucceeded was intended to avoid this precise scenario, but might have a minor syntax screw-up somewhere. Could you describe how you're what the Tasks involved are doing prior to allSucceeded? (i.e., an andThen or something.)

[piercifani]

I was able to create a gist with this issue, let me know if that helps!

EDIT: on my real code, I create the tasks with a cancellation handler, but this seems to generate the same crash.

[zwaldowski]

It helped a lot, thanks! See the swift-3_0 branch. I hope to cut a tag soon.