Scala Soundness scenario 10 to check for cancellation using relent()

[jackgene]

This is per propensive/parasite#18

However it is not working, so leaving it as a draft PR while I address with @propensive. I think this might be related to the other TODOs pertaining to loser tasks not cancelling properly in a race().

[propensive]

Looks like you've done a lot of great work to get most of these scenarios working with Soundness, especially given the limited documentation available! I'll take a closer look over the next couple of days to see if I can help resolve the failures, and offer any other improvements.

But once we get there, these examples put me in a much better position to announce and release a first version of Parasite. So thank you for the work so far!

[jackgene]

Looks like you've done a lot of great work to get most of these scenarios working with Soundness, especially given the limited documentation available! I'll take a closer look over the next couple of days to see if I can help resolve the failures, and offer any other improvements.

But once we get there, these examples put me in a much better position to announce and release a first version of Parasite. So thank you for the work so far!

Thank you! I'll open an issue under Parasite with more details with my findings as well.