Scala 2.12 has been out for more than a year now (it was released back in November 2016).  I would guess that historically Spark has been a big source of new recruits to the Scala world. People who might not necessarily have been interested in discovering a new language started using Spark because it addressed specific problems that they had to deal with and through this they discovered Scala.  So it’s disappointing that Spark, rather than leading the Scala charge, is actively holding up the mov...