Thank you!

CI is failing because you need sign the Scala CLA before we could accept this:

Please sign the Scala CLA to contribute to scala/scala-collection-compat
Go to https://www.lightbend.com/contribute/cla/scala

Thanks for guiding me!
I've signed the CLA, but I guess it need some time to process an application. Do I need to trigger the build manually then?

I've restarted CI.

Does this actually work on 2.11 and 2.12, or does providing it merely prevent cross-compilation from failing, like we did for @nowarn?

it should work on 2.11/2.12, l've tested and haven't spotted a warning for unused variable.

Thank you!