Struggling to convert Java code that uses Retrolambda/Java 8, due to type loss.

Wait what?

it was a quote we had in there ^^ a bunch of them included the issues that have already been fixed, but people still faced in the past.

"Kotlin doesn't let enums contain constants." what does it mean exactly?

It means annotation class body currently must be empty

you can definitely give it vals in its primary constructor...