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Add changelog for 3.6.3-RC1
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‎changelogs/3.6.3-RC1.md

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# Highlights of the release
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- Scala 2 forwardport: `-Yprofile-trace` [#19897](https://github.com/scala/scala3/pull/19897)
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# Other changes and fixes
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## Annotations
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- Fix Java parsing of annotations on qualified types [#21867](https://github.com/scala/scala3/pull/21867)
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- Consider all arguments in Annotations.refersToParamOf [#22001](https://github.com/scala/scala3/pull/22001)
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## Backend
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- Flag class file collision as error [#19332](https://github.com/scala/scala3/pull/19332)
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## Compiler Phases
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- Fix #21939: Update names and descriptions for cc and setup phases [#21942](https://github.com/scala/scala3/pull/21942)
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## Experimental: Explicit Nulls
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- Improve warning for wildcard matching only null under the explicit nulls flag (scala#21577) [#21623](https://github.com/scala/scala3/pull/21623)
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- Fix warning message for matching on redundant nulls [#21850](https://github.com/scala/scala3/pull/21850)
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## Experimental: Capture Checking
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- Fix #21868, #21869, and #21870: handle CapsOf in more places [#21875](https://github.com/scala/scala3/pull/21875)
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- Consolidate CC [#21863](https://github.com/scala/scala3/pull/21863)
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- Add path support for capture checking [#21445](https://github.com/scala/scala3/pull/21445)
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## Experimentals
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- Replace symbol traversal with tree traversal when finding top level experimentals [#21827](https://github.com/scala/scala3/pull/21827)
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## Extension Methods
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- Nowarn extension matching nonpublic member [#21825](https://github.com/scala/scala3/pull/21825)
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## Implicits
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- Apply implicit conversion from derived Conversion instance defined as implicit rather than given [#21785](https://github.com/scala/scala3/pull/21785)
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## Imports
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- Allow imports nested in packagings to shadow [#21539](https://github.com/scala/scala3/pull/21539)
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## Inline
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- Avoid using the current denotation in NamedType.disambiguate [#21414](https://github.com/scala/scala3/pull/21414)
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- Drop phase.isTyper use in isLegalPrefix/asf [#21954](https://github.com/scala/scala3/pull/21954)
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- Fix for macro annotation that resolves macro-based implicit crashing the compiler [#20353](https://github.com/scala/scala3/pull/20353)
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- Allow macro annotations to recover from suspension [#21969](https://github.com/scala/scala3/pull/21969)
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## Linting
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- Disallow open modifier on objects [#21922](https://github.com/scala/scala3/pull/21922)
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- Allow discarding "Discarded non-Unit" warnings with `: Unit` [#21927](https://github.com/scala/scala3/pull/21927)
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## Opaque Types
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- Fix pkg obj prefix of opaque tp ext meth [#21527](https://github.com/scala/scala3/pull/21527)
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## Parser
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- Fix: don't consider `into` as a soft-modifier [#21924](https://github.com/scala/scala3/pull/21924)
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## Pattern Matching
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- Drop inaccessible subclasses from refineUsingParent [#21799](https://github.com/scala/scala3/pull/21799)
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- (Re-)Drop inaccessible subclasses from refineUsingParent [#21930](https://github.com/scala/scala3/pull/21930)
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- Fix use of class terms in match analysis [#21848](https://github.com/scala/scala3/pull/21848)
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- Don't project nested wildcard patterns to nullable [#21934](https://github.com/scala/scala3/pull/21934)
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- Fix provablyDisjoint handling enum constants with mixins [#21876](https://github.com/scala/scala3/pull/21876)
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- Do not consider uninhabited constructors when performing exhaustive match checking [#21750](https://github.com/scala/scala3/pull/21750)
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## Presentation Compiler
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- Update mtags to 1.4.1 and backport remaining changes [#21859](https://github.com/scala/scala3/pull/21859)
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- Backport changes for the presentation compiler from Metals [#21756](https://github.com/scala/scala3/pull/21756)
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## Pickling
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- Avoid orphan param from default arg [#21824](https://github.com/scala/scala3/pull/21824)
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- Make sure definition tree has the defined symbol [#21851](https://github.com/scala/scala3/pull/21851)
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## REPL
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- Allow top-level opaque type definitions in REPL [#21753](https://github.com/scala/scala3/pull/21753)
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## Scaladoc
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- Fix scaladoc TastyInspector regressions [#21716](https://github.com/scala/scala3/pull/21716)
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- Bring back the fix for scaladoc TastyInspector regressions [#21929](https://github.com/scala/scala3/pull/21929)
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## Standard Library
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- Combine cases of `Tuple.Zip` disjoint from `(h1 *: t1, h2 *: t2)` [#21287](https://github.com/scala/scala3/pull/21287)
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## Quotes
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- Fix #20471: owners of top-level symbols in cached quoted code being incorrect [#21945](https://github.com/scala/scala3/pull/21945)
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## Reporting
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- Do not warn about expected missing positions in quotes.reflect.Symbol [#21677](https://github.com/scala/scala3/pull/21677)
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- Add missing error messages to asserts in QuotesImpl [#21852](https://github.com/scala/scala3/pull/21852)
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- Don't point to the compiler backlog when a compiler plugin phase crashes [#21887](https://github.com/scala/scala3/pull/21887)
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- Better error message for polytypes wrapping capturing types [#21843](https://github.com/scala/scala3/pull/21843)
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- Pretty-print lambdas [#21846](https://github.com/scala/scala3/pull/21846)
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## Scala.js
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- Shade scalajs.ir under dotty.tools [#21765](https://github.com/scala/scala3/pull/21765)
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## Scaladoc
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- Fix scaladoc graph highlight background color in dark mode [#21814](https://github.com/scala/scala3/pull/21814)
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## SemanticDB
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- Extract semanticDB for lifted definitions [#21856](https://github.com/scala/scala3/pull/21856)
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## Transform
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- Fix enclosingClass from returning refinement classes [#21411](https://github.com/scala/scala3/pull/21411)
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- Attempt to beta reduce only if parameters and arguments have same shape [#21970](https://github.com/scala/scala3/pull/21970)
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- Drop copied parent refinements before generating bytecode [#21733](https://github.com/scala/scala3/pull/21733)
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## Tooling
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- Ensure to escape characters before constructing JSON profile trace [#21872](https://github.com/scala/scala3/pull/21872)
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## Tuples
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- Fix tupleTypeFromSeq for XXL tuples [#21782](https://github.com/scala/scala3/pull/21782)
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## Typer
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- Do not crash when typing a closure with unknown type, since it can occur for erroneous input [#21178](https://github.com/scala/scala3/pull/21178)
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- Revert SAM condition to what it was before [#21684](https://github.com/scala/scala3/pull/21684)
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- Fix ctx implicits under case unapplySeq [#21748](https://github.com/scala/scala3/pull/21748)
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- Avoid erasure/preErasure issues around Any in transformIsInstanceOf [#21647](https://github.com/scala/scala3/pull/21647)
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# Contributors
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Thank you to all the contributors who made this release possible 🎉
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According to `git shortlog -sn --no-merges 3.6.2..3.6.3-RC1` these are:
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```
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30 Dale Wijnand
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30 Kacper Korban
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27 Wojciech Mazur
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14 noti0na1
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10 Eugene Flesselle
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10 Hamza Remmal
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10 HarrisL2
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9 Martin Odersky
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8 Matt Bovel
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7 Jan Chyb
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6 Tomasz Godzik
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4 Jamie Thompson
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2 Friendseeker
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2 Pascal Weisenburger
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2 Seth Tisue
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2 Sébastien Doeraene
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1 Adrien Piquerez
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1 Alden Torres
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1 Alexander
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1 Fengyun Liu
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1 Georgi Krastev
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1 Jentsch
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1 Lunfu Zhong
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1 Michał Pałka
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1 Natsu Kagami
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1 dependabot[bot]
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1 friendseeker
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1 tgodzik
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```

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