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Scala releases: 2.12.3 and 2.13.0-M2

Jason Zaugg Compiler Engineer, Lightbend, Inc.

We are happy to announce two new Scala releases: 2.12.3 improves compiler performance and fixes a variety of bugs and 2.13.0-M2 brings these changes along with a refactored REPL implementation pre-release branch of Scala 2.13. Many thanks to everyone who contributed!

Scala 2.12.3 improves compiler performance, adds more fine grained configuration for the optimiser, improves the presentation compiler, and fixes a varety of other issues.

Scala 2.13.0-M2 includes an internal refactoring of the REPL to better separate its UI from the compiler and improve the presentation of error messages. This cleanup sets the stage for work on new features such as syntax highlighting. All the improvements changes in 2.12.3 are avaiable in this release, too. As a reminder, our full 2.13 roadmap is available for review on GitHub.

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