Please don't post flamebait to Hacker News.

Foursquare lib migration to Scala 2.12, open since one year, we can't upgrade to 2.12 because of that dependency,

https://github.com/foursquare/fsqio/issues/37

They don't upgrade the open source version because their internal version depends on that open source version and they don't can't upgrade internally to 2.12.

They can't upgrade because of several dependencies of their own, the last one Finagle.

All of those although "cross compiles are no problem" as the default answer from the Scala development team on these issues.

I don’t know is this is a good troll because I’m replying or a bad troll because it’s so obvious.

There are Many people who work at many companies doing real development with Scala that goes all the way to production, handling real user traffic.

Yes we use Scala in production for >6 years.

But I wonder how many companies would make the same decision again after their experience with Scala.