Highlights of the release

• Partial Fix #21242: Add REPL init script setting #22206
• Update asm to patched 9.7.1 #22250
• REPL: Add back :silent command #22248
• Do not lift annotation arguments #22035 and #22046
• Scala 2 forwardport: -Yprofile-trace #19897

Other changes and fixes

Annotations

• Make sure symbols in annotation trees are fresh before pickling #22002
• Fix Java parsing of annotations on qualified types #21867
• Rename InlineCopier to ConservativeTreeCopier, use it in TypeMaps #21941
• Consider all arguments in Annotations.refersToParamOf #22001

Backend

• Flag class file collision as error #19332
• Backend computes line number from source of position #21763

CI

• In CI, use new standard scala/cla-checker action #22203
• Cancel stale CI executions when CI is re-triggered in the same branch/PR #21974
• Drop support for old experimental in community-build #21729

Coverage

• Fix coverage serialization when encountering macro suspension #22303

Dependencies

• Sbt 1.10.5 (was 1.9.9) #20157
• Scala 2.13.16 (was .15) #22386

Desugaring

• Fix #22051: only trust the type application part for case class unapplies #22099

Documentation

• Fix: typo in documentation for Tuple.zip #22313
• Copyright 2025 #22326
• Documentation only: update Example code linked to obsolete content in macros-spec.md #22256
• Doc fix, removed repeated use of the word with #21915
• Fix typos #21913

Enums

• Add type parameters derived from enum to default param getters of enum cases #22157

Extension Methods

• Add regression test for #22320 #22321
• Tweak ExtensionNullifiedByMember #22268

Infrastructure

• Improve, document and group versioning code in Build.scala #21837
• Fix: drop jackson-module-scala from CB #22353
• Fix inductive-implicits benchmark #22007
• Remove tests/pos-with-compiler-cc from VSCode ignored files #22198
• Bump webrick from 1.8.2 to 1.9.1 in /docs/_spec #22066
• Fix Windows OS detection in TraceNameManglingTest #21937
• Don't warn for deprecated Thread.getId() calls in ChromeTrace #21831
• Improvement: Remove workaround for Bloop and update docs #21842
• Ensure ChromeTraceTest event timestamps are emitted in correct invervals #21911
• Remove tests/pos-with-compiler-cc #21956
• Shade scalajs.ir under dotty.tools #21765

Implicits

• Rollback constraints in compareAppliedTypeParamRef #22339
• Apply implicit conversion from derived Conversion instance defined as implicit rather than given #21785

Imports

• Allow imports nested in packagings to shadow #21539

Inline

• Fix inline reduction for CaseDef guards with asInstanceOf #22305
• Avoid using the current denotation in NamedType.disambiguate #21414

Linting

• Append instead of prepending import selectors for the current scope when collecting them in CheckUnused #22314
• Allow discarding "Discarded non-Unit" warnings with : Unit #21927
• Disallow open modifier on objects #21922
• Only count associated files of direct members of package objects in dropStale #22190

Metaprogramming

• Rethrow SuspendExceptions caught in CodeGen phase #22009
• Extend compiletime.testing.typechecks with certain transform phases #21185

Match Types

• Fix #21841: Check more that an unapplySeq on a NonEmptyTuple is valid. #22366
• Type avoidance in MT bound inference #22142

Nullability

• Fix #21619: Refactor NotNullInfo to record every reference which is retracted once. #21624

Parser

• Fix: don't consider into as a soft-modifier #21924
• Fix: Allow as as an infix type in non context bound types #21849
• Undo patch of double-block apply #21982

Pattern Matching

• (Re-)Drop inaccessible subclasses from refineUsingParent #21930
• Fix #21914: Don't project nested wildcard patterns to nullable #21934
• Fix use of class terms in match analysis #21848
• Fix provablyDisjoint handling enum constants with mixins #21876
• Do not consider uninhabited constructors when performing exhaustive match checking #21750

Pickling

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

Presentation Compiler

• Use new infer expected type for singleton complations #21421
• Fix presentation compiler testcases #22253
• Fix match error in keyword completions #22138
• Add test cases project for presentation compiler #22101
• Improvement: Update mtags to 1.4.1 and backport remaining changes #21859
• Backport changes for the presentation compiler from Metals #21756

Quotes

• Fix tupleTypeFromSeq for XXL tuples #21782
• Do not bring forward symbols created in transform and backend phases #21865
• Fix #20471: owners of top-level symbols in cached quoted code being incorrect #21945
• Fix for macro annotation that resolves macro-based implicit crashing the compiler #20353
• Allow macro annotations to recover from suspension #21969

REPL

• REPL: JLine: follow recommendation to use JNI, not JNA; also JLine 3.27.1 (was 3.27.0) #22205
• Fix #9879: allow top-level opaque type definitions in REPL #21753

Reflection

• Do not return java outline dummy constructor in primaryConstructor #22104

Reporting

• Normalise the types for Type Mismatch Error (E007) #22337
• 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
• Nowarn extension matching nonpublic member #21825
• Fix: better error messages when an enum derives from AnyVal #22236

Scaladoc

• [ISSUE-#19208] If scaladocs on file protocol don't do SPA routing. #22013
• Fix scaladoc graph highlight background color in dark mode #21814

SemanticDB

• Extract semanticDB for lifted definitions #21856

Specification

• Align the spec to allow the marker #22323
• Fix #20271: Bring for comprehension spec up to date. #21702
• Spec: Integrate the specification for match types. #22164

Settings

• Limit exposure to ConcurrentModificationException when sys props are replaced or mutated #22180

Tooling

• Connect the input to the compiler in sbt #22336
• Ensure to escape characters before constructing JSON profile trace #21872
• Fix: correctly print literal types in the refined printer #22351

Transform

• Attempt to beta reduce only if parameters and arguments have same shape #21970
• Fix enclosingClass from returning refinement classes #21411
• Fix #22226: Use classOf[BoxedUnit] for Unit array in ArrayConstructors. #22238
• Fix typo in allTermArguments #21836

Typer

• Fixes for isLegalPrefix change #22241
• Resolve name when named imp is behind wild imps #21888
• Do not crash when typing a closure with unknown type, since it can occur for erroneous input #21178
• Allow autotupling if fn's param is a type param #21741
• Fix ctx implicits under case unapplySeq #21748
• Avoid using ExplainingTypeComparer in regular code #21583
• Avoid erasure/preErasure issues around Any in transformIsInstanceOf #21647
• Remove tvars introduced while testing normalizedCompatible #21466

Miscellaneous

• Replace deprecated AnyRefMap #22230

Contributors

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

According to git shortlog -sn --no-merges 3.3.5..3.3.6-RC1 these are:

    63  Tomasz Godzik
    30  Dale Wijnand
    26  Wojciech Mazur
    20  noti0na1
    15  Hamza Remmal
    15  Matt Bovel
    10  Jan Chyb
     9  Kacper Korban
     6  Som Snytt
     4  Sébastien Doeraene
     3  HarrisL2
     3  Jamie Thompson
     3  Martin Odersky
     3  Seth Tisue
     3  kasiaMarek
     2  Friendseeker
     2  João Ferreira
     2  Kenji Yoshida
     2  Natsu Kagami
     2  Pascal Weisenburger
     2  dependabot[bot]
     1  Adrien Piquerez
     1  Alden Torres
     1  Alexander
     1  Georgi Krastev
     1  Guillaume Martres
     1  Jentsch
     1  Lunfu Zhong
     1  Mathias
     1  Michał Pałka
     1  Oleg Zenzin
     1  Oliver Bračevac
     1  friendseeker
     1  philippus
     1  tgodzik
     1  xiaoshihou