Scala 2.12.5 is now out! Highlights: the backend can now process classes in parallel (experimental), a Java 9 style -release flag, performance improvements.
Details: https://github.com/scala/scala/releases/tag/v2.12.5
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There is a regression in 2.12.5 when running on Java 9 and 10: https://github.com/scala/scala-dev/issues/480 . The 2.12.5 release notes were updated to mention the regression.
We’ll be releasing 2.12.6 soon to address it. In the meantime, stick with 2.12.4 if you want to use Java 9 or 10.
You can track progress on 2.12.6 at https://contributors.scala-lang.org/t/scala-2-12-6-coming-soon/1729/3