Highlights of the release

• Scala 2 forwardport: -Yprofile-trace #19897

Other changes and fixes

Annotations

• Fix Java parsing of annotations on qualified types #21867
• Consider all arguments in Annotations.refersToParamOf #22001

Backend

• Flag class file collision as error #19332

Compiler Phases

• Fix #21939: Update names and descriptions for cc and setup phases #21942

Experimental: Explicit Nulls

• Improve warning for wildcard matching only null under the explicit nulls flag (scala#21577) #21623
• Fix warning message for matching on redundant nulls #21850

Experimental: Capture Checking

• Fix #21868, #21869, and #21870: handle CapsOf in more places #21875
• Consolidate CC #21863
• Add path support for capture checking #21445

Experimentals

• Replace symbol traversal with tree traversal when finding top level experimentals #21827

Extension Methods

• Nowarn extension matching nonpublic member #21825

Implicits

• Apply implicit conversion from derived Conversion instance defined as implicit rather than given #21785

Imports

• Allow imports nested in packagings to shadow #21539

Inline

• Avoid using the current denotation in NamedType.disambiguate #21414
• Drop phase.isTyper use in isLegalPrefix/asf #21954
• Fix for macro annotation that resolves macro-based implicit crashing the compiler #20353
• Allow macro annotations to recover from suspension #21969

Linting

• Disallow open modifier on objects #21922
• Allow discarding "Discarded non-Unit" warnings with : Unit #21927

Opaque Types

• Fix pkg obj prefix of opaque tp ext meth #21527

Parser

• Fix: don't consider into as a soft-modifier #21924

Pattern Matching

• Drop inaccessible subclasses from refineUsingParent #21799
• (Re-)Drop inaccessible subclasses from refineUsingParent #21930
• Fix use of class terms in match analysis #21848
• Don't project nested wildcard patterns to nullable #21934
• Fix provablyDisjoint handling enum constants with mixins #21876
• Do not consider uninhabited constructors when performing exhaustive match checking #21750

Presentation Compiler

• Update mtags to 1.4.1 and backport remaining changes #21859
• Backport changes for the presentation compiler from Metals #21756

Pickling

• Avoid orphan param from default arg #21824
• Make sure definition tree has the defined symbol #21851

REPL

• Allow top-level opaque type definitions in REPL #21753

Scaladoc

• Fix scaladoc TastyInspector regressions #21716
• Bring back the fix for scaladoc TastyInspector regressions #21929

Standard Library

• Combine cases of Tuple.Zip disjoint from (h1 *: t1, h2 *: t2) #21287

Quotes

• Fix #20471: owners of top-level symbols in cached quoted code being incorrect #21945

Reporting

• Do not warn about expected missing positions in quotes.reflect.Symbol #21677
• Add missing error messages to asserts in QuotesImpl #21852
• Don't point to the compiler backlog when a compiler plugin phase crashes #21887
• Better error message for polytypes wrapping capturing types #21843
• Pretty-print lambdas #21846

Scala.js

• Shade scalajs.ir under dotty.tools #21765

Scaladoc

• Fix scaladoc graph highlight background color in dark mode #21814

SemanticDB

• Extract semanticDB for lifted definitions #21856

Transform

• Fix enclosingClass from returning refinement classes #21411
• Attempt to beta reduce only if parameters and arguments have same shape #21970
• Drop copied parent refinements before generating bytecode #21733

Tooling

• Ensure to escape characters before constructing JSON profile trace #21872

Tuples

• Fix tupleTypeFromSeq for XXL tuples #21782

Typer

• Do not crash when typing a closure with unknown type, since it can occur for erroneous input #21178
• Revert SAM condition to what it was before #21684
• Fix ctx implicits under case unapplySeq #21748
• Avoid erasure/preErasure issues around Any in transformIsInstanceOf #21647

Contributors

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

According to git shortlog -sn --no-merges 3.6.2..3.6.3-RC1 these are:

  30 Dale Wijnand
  30 Kacper Korban
  27 Wojciech Mazur
  14 noti0na1
  10 Eugene Flesselle
  10 Hamza Remmal
  10 HarrisL2
    9 Martin Odersky
    8 Matt Bovel
    7 Jan Chyb
    6 Tomasz Godzik
    4 Jamie Thompson
    2 Friendseeker
    2 Pascal Weisenburger
    2 Seth Tisue
    2 Sébastien Doeraene
    1 Adrien Piquerez
    1 Alden Torres
    1 Alexander
    1 Fengyun Liu
    1 Georgi Krastev
    1 Jentsch
    1 Lunfu Zhong
    1 Michał Pałka
    1 Natsu Kagami
    1 dependabot[bot]
    1 friendseeker
    1 tgodzik