Notable Changes

Language

• New proposal for extension methods #5114
• Refinements to realizability #5568
• Propagate dependencies through implicit parameters #5601
• Add SIP 23 ValueOf #5647
• Tests to Explore Typeclass Derivation #5497
• Gadt unification #5611
• Add SIP compliant by-name implicits #5461
• Fix #5526: Better type inference for dependent function types #5631
• Fix #5411: varargs with intersection type elements #5632
• Fix #5556: Check SAM types for realizability #5623
• Fix #5527: Fix companion module for hk opaque type aliases #5628
• Fix #4678: Create single Typed tree with multiple type annotations #5714
• Fixes #5640 Typer crash on 0 arity tuple #5660
• Memoize SourceFile creation #5642
• Fix #5350: Fix purity of local lazy vals #5703
• Rewrite typer.TermRefSet #5593
• Revive the Scala.js backend. #5143

Meta-programming

• Add typeOf to TASTy reflection #5569
• Allow macros calling inherited methods on modules #5575
• Move TASTy Reflect decorators to top level #5589
• Improve showExpr example #5562
• Add minimal prototype for f interpolator macro #5532
• Add List[Expr[T]] to Expr[List[T]] conversion in the library #5543
• Remove TASTy Reflect Select signature from extractor #5542
• Rename reflect/reify and make them plain methods #5474
• Add tasty seal methods #5603
• Add TASTy reflect constructors #5438
• Decompiler: final, duplicate type args, default initialiser #5728
• Add missing TASTy Reflect type API #5529
• Add tasty.reflect.utils #5685
• Tasty add flag constructors #5670

Tooling

• Fix race condition in worksheet output #5552
• Run worksheets after willSave instead of didSave #5553
• Fix #3979: Completion for renamed imports #4977
• Support multi-project rename #5462
• Small improvements to workspace/symbol #5443
• Decompile .tasty files with VS Code Extension #5513
• Fix #4713: Fixing sidebar auto-collapse issue #5654
• worsksheet: clarify where the hidden output is #5605
• Rework multi-line output handling in the worksheet #5582

As well as many bug fixes and other improvements!

Contributors

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

According to git shortlog -sn --no-merges 0.11.0-RC1..0.12.0-RC1 these are:

    109  Martin Odersky
    64  Nicolas Stucki
    34  Martin Duhem
    25  Allan Renucci
    16  Guillaume Martres
    12  Aleksander Boruch-Gruszecki
    11  Tobias Bordenca
    10  Miles Sabin
    10  Liu Fengyun
     7  Aggelos Biboudis
     7  Jaemin Hong
     5  Paolo G. Giarrusso
     3  duanebester
     3  Dotty CI
     2  Sébastien Doeraene
     2  Saurabh Rawat
     2  Vlastimil Dort
     1  tOverney
     1  Denis Buzdalov
     1  Hermes Espínola González
     1  Ivan Youroff
     1  João Pedro de Carvalho
     1  Neeraj Jaiswal
     1  Olivier Blanvillain
     1  poechsel
     1  Abel Nieto

Reporting Bugs

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