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dotty v3.0.0-M2 Release Notes

• Notable Changes

  Platform

  • ⬆️ The standard library was upgraded to Scala 2.13.4, JDK 14 and 15 are now supported. (#10392)

  Syntax

  • The @infix annotation was replaced by an infix modifier, the @mixin annotation was replaced by transparent (#10458)
  • The @alpha annotation was renamed to @targetName and can now be used to define overloads that would normally result in a double definition error (#10149)

  Reflection

  💥 Breaking changes

  • QuoteContext has been renamed Quotes (#10432)
  • Instead of importing qctx.tasty._, import quotes.reflect._ (#10442)
  • rootPosition is now Position.ofMacroExpansion (#10467)
  • Owners are now explicit in the reflection API (#10406)
  • compiletime.code has been replaced with compiletime.codeOf (#10313)
  • The syntax for type variables in quoted patterns has changed (#10125)

  ➕ Additions

  • 🆕 new API: TypeTest for safe type tests at runtime (#7555)

  Scala.js

  • ⬆️ Upgrade to Scala.js 1.3.1 (#10423)
  • Implement the -scalajs-mapSourceURI option (#10439)
  • Implement JS exports (#10164)
  • 👍 Scala.js is now 100% supported

  Scala3doc

  • 📚 Numerous improvements over many PRs, Scala3doc is still not the default documentation tool (this requires setting useScala3doc := true), but it is now used to generate the https://dotty.epfl.ch/ website.
  • 👀 For more information on Scala3doc see https://contributors.scala-lang.org/t/scala3doc-doctool-for-scala-3/4477

Previous changes from v3.0.0-M1

• Notable Changes

  Syntax

  🛠 Fix #9829: Allow as in place of @ for pattern bindings #9837
  🔄 Change wildcard given selectors #9949
  Keep @Alpha optional #10093

  Scala.js

  Scala.js: Implement non-native JS classes. #9774
  Scala.js: Implement the PrepJSInterop phase, minus exports handling. #9725

  Optimization

  📜 Port classfile parsing improvements #10037
  Semanticdb usability enhancements #9768
  ⚡️ Optimize core and frontend #9867

  Contributors

  🚀 Thank you to all the contributors who made this release possible 🎉

  🔀 According to git shortlog -sn --no-merges 0.27.0-RC1..3.0.0-M1 these are:

     171 Martin Odersky
      94 Nicolas Stucki
      75 Liu Fengyun
      62 Aleksander Boruch-Gruszecki
      50 Filip Zybała
      35 Krzysztof Romanowski
      34 Anatolii Kmetiuk
      32 Sébastien Doeraene
      31 Guillaume Martres
      28 Jamie Thompson
      20 bishabosha
      19 Guillaume Raffin
      16 Krzysztof Romanwoski
      12 Ruslan Shevchenko
       9 Tom Grigg
       6 Som Snytt
       5 odersky
       5 Andrzej Ratajczak
       4 Michał Pałka
       3 Adrien Piquerez
       3 Tudor Voicu
       3 noti0na1
       2 Krzysztof Bochenek
       2 Tudor
       2 Raphael Jolly
       2 Miles Sabin
       1 Vasil Vasilev
       1 ansvonwa
       1 Greg Zoller
       1 felher
       1 gzoller
       1 zgrybus
       1 Fengyun Liu
       1 Philippus Baalman
       1 Krzysiek Bochenek
       1 Tomasz Godzik
       1 ysthakur
  

  Reporting Bugs

  🍱 If you encounter a bug, please open an issue! 🙏

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