[AheadOfTime295]

YMMV. Some features of Scala 2.x have been dropped in Scala 3 (ETA late 2020), others added.

Features we know Scala 3 will have https://dotty.epfl.ch/docs/

A comparison of features across Scala 2.x and Scala 3 is the migration guide https://github.com/scalacenter/scala-3-migration-guide