Notable Changes

• Support for implicit conversions on singleton types #4738
• The REPL now uses JLine3 under the hood which means support for Windows, better completions and multi-line editing #4680
• Documentation support in the IDE #4461, #4648
• Drop requirement that implicit functions must be non-empty #4549
• Improved auto-completion in the REPL #4398
• An experimental stream library built using quotes and splices #4317
• A step toward tree inspection in macros #4279
• Optimise applyOrElse for partial function literals #4245
• Emit feature warnings for implicit conversions #4229
• Optimise s and raw interpolators #3961
• Support for compiler plugins #3438

As well as many bug fixes and stability work

Contributors

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

According to git shortlog -sn --no-merges 0.8.0..0.9.0-RC1 these are:

 200 Nicolas Stucki
 155 Martin Odersky
 71 Allan Renucci
 42 Paolo G. Giarrusso
 27 Aggelos Biboudis
 25 Guillaume Martres
 22 Martin Duhem
 10 Sebastian Nadorp
 10 Wojtek Swiderski
 6 Olivier Blanvillain
 5 benkobalog
 4 Ingar Abrahamsen
 3 Ankit Soni
 2 Liu Fengyun
 2 Olivier ROLAND
 2 Fabian Page
 1 Roberto Bonvallet
 1 Fengyun Liu
 1 Zoltán Elek
 1 benkbalog
 1 Glavo
 1 dieutth
 1 fschueler
 1 mentegy

Reporting Bugs

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

Notable Changes

• sbt 1 support #3872
• Unchecked warnings #4045
• Kind Polymorphism #4108
• Improved support for SAM type #4152

Contributors

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

According to git shortlog -sn --no-merges 0.7.0..0.8.0-RC1 these are:

 95 Martin Odersky
 91 liu fengyun
 91 Nicolas Stucki
 84 Allan Renucci
 73 Guillaume Martres
 67 Martin Duhem
 18 Jendrik Wenke
 16 Paolo G. Giarrusso
 8 Robert Stoll
 6 Thierry Treyer
 4 Aggelos Biboudis
 1 tokkiyaa
 1 Rajesh Veeranki
 1 Maxime Kjaer
 1 Saurabh Rawat
 1 Joan
 1 Jorge Vicente Cantero
 1 Jasper Moeys
 1 Piotr Gabara

Reporting Bugs

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

Notable Changes

• Enum Simplification #4003
• Erased terms #3342
• Improved IDE support #3960
• Improved GADT support #3918, #3990, #4034

Contributors

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

According to git shortlog -sn --no-merges 0.6.0..0.7.0-RC1 these are:

 182 Martin Odersky
 94 Nicolas Stucki
 48 Olivier Blanvillain
 38 liu fengyun
 16 Allan Renucci
 15 Guillaume Martres
 11 Aggelos Biboudis
 5 Abel Nieto
 5 Paolo G. Giarrusso
 4 Fengyun Liu
 2 Georg Schmid
 1 Jonathan Skowera
 1 Fedor Shiriaev
 1 Alexander Slesarenko
 1 benkobalog
 1 Jimin Hsieh

Reporting Bugs

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

Notable Changes

The main portion of this release is constituted of bug fixes and stability work. We closed more than 200 issues since our last release!

This release also includes a prototype implementation of the new Principled Meta Programming framework.

Contributors

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

According to git shortlog -sn --no-merges 0.5.0-RC1..0.6.0-RC1 these are:

 210 Martin Odersky
 101 Nicolas Stucki
 42 Guillaume Martres
 30 Allan Renucci
 9 liu fengyun
 7 Olivier Blanvillain
 3 k0ala
 2 Oron Port
 2 Fengyun Liu
 2 Vitor Vieira
 2 Wojtek Swiderski
 1 odersky
 1 Simon Popugaev
 1 Yevgen Nerush

Reporting Bugs

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

Notable Changes

• Reworked implicit search: #3421
• Dependent function types: #3464
• Tasty Frontend improvements and bug fixes: #3436, #3492, #3512, #3519
• Generic java signatures: #3234
• Support for compiling to jar: #3382

Contributors

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

According to git shortlog -sn --no-merges 0.4.0-RC1..0.5.0-RC1 these are:

Nicolas Stucki
Martin Odersky
Allan Renucci
Guillaume Martres
Martin Duhem
liu fengyun
Miron Aseev
Matt D'Souza
Raphael Bosshard
k0ala
Vitor Vieira
Fengyun Liu
Michal Gutowski
Robert Soeldner
Aurélien Richez
rsoeldner
Hermes Espínola González
Jean Detoeuf
Karol Chmist
Olivier Blanvillain
William Narmontas
Yevgen Nerush
gan74
gosubpl

Release notes

• Fix a regression in the support for Scala 2 libraries: #3066