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Releases: scala/scala3

3.4.0

29 Feb 15:39
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Highlights of the release

  • Make polymorphic functions more efficient and expressive #17548
  • SIP-56: Better foundations for match types #18262
  • Make SIP 54 (Multi-Source Extension Overloads) a standard feature #17441
  • Value parameter inference for polymorphic lambdas #18041
  • Add @publicInBinary annotation and -WunstableInlineAccessors linting flag #18402
  • Stabilize Quotes defn.PolyFunction #18480
  • Stabilize Quotes Flags.AbsOverride #18482
  • Add -experimental compiler flags #18571
  • Stabilize SIP-53 (quote pattern explicit type variable syntax) #18574
  • Add reflect TypeRepr.dealiasKeepOpaques #18583
  • Add attributes section to TASTy and use it for Stdlib TASTy #18599
  • Error when reading class file with unknown newer jdk version #18618
  • Add support for xsbti.compile.CompileProgress #18739
  • Improve type inference for functions like fold #18780
  • Improve error message for mismatched tasty versions, allow configuration of header unpickler #18828
  • In 3.4 make refutable patterns in a for comprehension an error #18842
  • Disallow use of PolyFunction in user code #18920
  • Store source file in TASTY attributes #18948
  • First step to pipelining support - enable reading Java symbols from TASTy #19074
  • Activate constrainResult fix in 3.4 #19253
  • Parallelise JVM backend - Scala 2 port #15392
  • Avoid generating given definitions that loop #19282

Deprecation warnings for old syntax

  • _ type wildcards #18813
  • private[this] #18819
  • var x = _ #18821
  • with as a type operator #18837
  • xs: _* varargs #18872
  • trailing _ to force eta expansion #18926
  • Make explicit arguments for context bounds an error from 3.5 #19316

Other changes and fixes

Backend

  • Count size of parameters for platform limit check #18464
  • Don't emit line number for synthetic unit value #18717
  • Avoid too eager transform of $outer for lhs & accessor rhs #18949
  • Make more anonymous functions static #19251
  • Fix deadlock in initialization of CoreBTypes using Lazy container #19298
  • Fix #18769: Allow HK type args in Java signatures. #18883
  • Loading symbols from TASTy files directly #17594
  • Use dedicated equals method for univerval equality of chars #18770

Erasure

  • Get generic signature of fields entered after erasure from their accessor #19207
  • Detect case where two alternatives are the same after widening ExprTypes #18787
  • Improve erased params logic #18433

Experimental: Capture Checking

  • Fix capture set variable installation in Setup #18885
  • Don't follow opaque aliases when transforming sym info for cc #18929
  • Reset comparersInUse to zero in ContextState.reset #18915
  • Special handling of experimental.captureChecking import #17427
  • Change handling of curried function types in capture checking #18131
  • Fix #18246: correctly compute capture sets in TypeComparer.glb #18254
  • New capture escape checking based on levels #18463
  • A more robust scheme for resetting denotations after Recheck #18534
  • A more flexible scheme for handling the universal capability #18699
  • Fix potential soundness hole when adding references to a mapped capture set #18758
  • Alternative scheme for cc encapsulation #18899
  • Make reach refinement shallow #19171

F-bounds

  • Don't check bounds of Java applications in Java units #18054

GADTs

  • Avoid embedding SelectionProtos in Conversions #17755
  • Freeze constraints while calculating GADT full bounds #18222

Implicits

  • Followup fix to transparent inline conversion #18130
  • Select local implicits over name-imported over wildcard imported #18203
  • Fix how implicit candidates are combined #18321
  • Improve error message about missing type of context function parameter #18788
  • Support implicit arguments before extractor method #18671
  • Tweak convertible implicits fix #18727
  • Turn given loop prevention on for -source future #19392
  • Fix algorithm to prevent recursive givens #19411
  • Handle default implicits to context parameters under -3.4-migration [#19512] (#19512)

Incremental Compilation

  • Make incremental compilation aware of synthesized mirrors #18310

Inference

  • Honour hard unions in lubbing and param replacing #18680

Infrastructure

  • Use -Yscala2-library-tasty to add Scala 2 lib TASTY to scalac (internal only) #18613
  • Rename stdlib-bootstrapped-tasty to scala2-library-tasty #18615
  • Fix #19286: Freeze rubygems-update at < 3.5.0. #19288

Initialization

  • Fix #17997: Handle intersection type as this type of super type #18069
  • Add test for issue #17997 affecting the global object initialization checker #18141
  • Fix i18624 and add test case for it #18859
  • Treat new Array(0) as immutable #19192
  • Fix #18407: Ignore Quote/Slice in init checker #18848
  • Check safe initialization of static objects #16970
  • Pattern match support in checking global objects #18127
  • Fix crash in global object initialization checker when select target has no source #18627
  • Fix warning underlining in global init checker #18668
  • Fix i18629 #18839
  • I18628 #18841
  • Make safe init checker skip global objects #18906
  • Handle local lazy vals properly #18998

Inline

  • Fix regression: inline match crash when rhs uses private inlined methods #18595
  • Add structural classes of dynamicApply before inlining #18766
  • Set missing expansion span for copied inlined node #18229
  • Fix callTrace of inlined methods #18738

Linting

  • Keep tree of type ascriptions of quote pattern splices #18412
  • Fix false positive in WUnused for renamed path-dependent imports #18468
  • Fix false positive in WUnused for renamed path-dependent imports (2) #18617
  • Fix w...
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Scala 3.3.2

29 Feb 15:38
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Notice

Summary: please skip this release and wait for 3.3.3

Unfortunately, a subtle bug in the TASTy reader managed to survive the Release Candidate (RC) process. The bug caused 3.3.2 to emit TASTy files incompatible with previous releases in the LTS line, namely 3.3.1 and 3.3.0. This means that, should a library author release a new version using 3.3.2, all users still based on older 3.3.x releases will encounter issues. While a simple workaround exists - users can bump their patch version in the LTS line, which is safe and recommended - we regard compatibility in the LTS as paramount. Therefore, we have decided to abandon the 3.3.2 release completely. New testing measures will be introduced to avoid such situations in the future and to guarantee that LTS line remains internally consistent in all cases.

Highlights of the release

  • Improvements to the Coverage (detailed list below)
  • Add Stable Presentation Compiler #17528

Other changes and fixes

Backend

  • Make sure synthetic apply methods are generated in deterministic order #18210

Coverage

  • Only lift inner expressions when lifting repeated Typed arguments #18424
  • Fix: scoverage statement's line number should be 1-base #18932
  • Do not lift applications of context functions #18498
  • Don't lift the argument of a synchronized block in scoverage #16941
  • Fix the issue with coverage inside of a TypeApply #18420
  • Coverage: mark case bodies as branches; don't ignore branches with synthetic spans #18437

Documentation

  • Compiler plugin Scaladoc: document phase requirement #18394

Exports

  • Refine override exclude criterion for export forwarders #17590

Incremental Compilation

  • Fix overcompilation due to unstable context bound desugaring #18280

Inline

  • Don't generate a super accessor for an inline method call #17598

Linting

  • Wunused: Only use type treverser for checking refinements in refined type trees #17929

Parser

Pattern Matching

  • Properly refine type of inlined unapply pattern #18292

Presentation Compiler

  • Bugfix: suggest correct arg name completions for lambda expressions #18379
  • Improvement: print better bracket suffix in completion item label #18380
  • Fix presentation compiler autoimports, update presentation compiler dependencies #18264
  • Update scala3-presentation-compiler to 39e349e #18296
  • Update presentation compiler with changes from PR 5287 #18301
  • Update presentation compiler to a829a6a #18347
  • Bugfix: highlight enum cases correctly #18362

Quotes

  • Do not beta-reduce/eta-expand pattern splices with contextual function types #18198
  • XcheckMacro types of Block expression and Apply/TypeApply function #18242
  • Fix owner of splices in class statements #18359
  • Handle macro dependencies through class of this #18396
  • Add missing span in QuoteMatcher #18178
  • Fix stale symbol crashes in some path depended types in macro contexts #18077
  • Simplify avoidance of local types of Hole #17571

Reporting

  • Detail "not a constant type" message #17626
  • Suggest imports for the expected type of the underlying implicit not found error #17976
  • Fix: report correct location on a repeat modifier #17982
  • Warn when calling synchronized on AnyVal #18021
  • Fix compile error message in wildcard exports #18189
  • Improve parameter type inference error messaging #18190
  • Don't report warnings in migration when performing rewrites #15589
  • Fix crash reporter, units and phases #17754
  • Omit more prefixes in non-package module printing #17758
  • Fix pretty printer to handle using and erased modifier #17952
  • Add -Yprint-tasty compiler flag #17986
  • Add actionable item to PatternMatchExhaustivity diagnostic #18314

Scaladoc

  • Fix: -no-link-warnings does not work #17028
  • Fix: Validation for API link #17099
  • Scaladoc: type rendering fixes and improvements #17213
  • Feat: Add a custom icon #17241
  • Fix: Correction of the siteRoot path #17297
  • Fix: Correct the navigation to anchor #17910
  • Fix: Style for wiki syntax #18079
  • Fix NoSuchElementException in scaladoc #18184
  • Update jsoup dependency of Scaladoc to 7.2 #19584

SemanticDB

  • Check for primary constructor in namePresentInSource #18325
  • Add -semanticdb-text compiler option #18307

Typer

  • Fix pattern generation in "ordinal" mirror method #17570
  • Fix superType of SuperType #17574
  • Avoid crash in erasure when reference cannot be emitted #18056
  • Disallow overloading from breaking stable patterns #18327
  • Fix widen types before checking an implicit view exists #18719
  • Properly handle SAM types with wildcards #18201
  • Handle recursion in collectParts #18214
  • Allow eta-expansion of inline defs #18249
  • Stable names for lambda lifted methods #18281
  • Fix expandParam's use of argForParam/isArgPrefixOf. #19412

Contributors

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

According to git shortlog -sn --no-merges 3.3.1..3.3.2 these are:

    42	Paweł Marks
    38	Nicolas Stucki
    28	Chris Kipp
    15	Sébastien Doeraene
    13	Lucas Leblanc
    13	Martin Odersky
    12	Guillaume Martres
    11	Dale Wijnand
    10	Jamie Thompson
     8	ghostbuster91
     6	Florian3k
     5	Kacper Korban
     4	Jan Chyb
     4	Jędrzej Rochala
     4	Katarzyna Marek
     4	Quentin Bernet
     4	Seth Tisue
     3	Lucas
     3	Matt Bovel
     2	Julien Richard-Foy
     2	Wojciech Mazur
     1	Aleksey Troitskiy
     1	Arnout Engelen
     1	Bjorn Regnell
     1	Eugene Yokota
     1	Fabián Heredia Montiel
     1	Justin Reardon
     1	Kisaragi
     1	Martin Kučera
     1	Matthew Rooney
     1	Matthias Kurz
     1	Ondrej Lhotak
     1	Rikito Taniguchi
     1	Stefan Wachter
     1	Yuito Murase
     1	rochala

3.4.0-RC4

05 Feb 11:53
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3.4.0-RC4 Pre-release
Pre-release

Backported fixes

  • Update jsoup dependency of Scaladoc to 7.2 #19584

Contributors

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

According to git shortlog -sn --no-merges 3.4.0-RC3..3.4.0-RC4 these are:

     2	Paweł Marks
     1	Fabián Heredia Montiel

3.3.2-RC3

05 Feb 11:53
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3.3.2-RC3 Pre-release
Pre-release

Backported fixes

  • Update jsoup dependency of Scaladoc to 7.2 #19584

Contributors

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

According to git shortlog -sn --no-merges 3.3.2-RC2..3.3.2-RC3 these are:

     2	Paweł Marks
     1	Fabián Heredia Montiel

3.3.2-RC2

05 Feb 11:53
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3.3.2-RC2 Pre-release
Pre-release

Backported fixes

  • Update Scala Library to 2.13.12 #19454
  • Fix expandParam's use of argForParam/isArgPrefixOf. #19412

Contributors

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

According to git shortlog -sn --no-merges 3.3.2-RC1..3.3.2-RC2 these are:

     2	Paweł Marks
     1	Dale Wijnand
     1	Jan Chyb
     1	Nicolas Stucki
     1	Seth Tisue


3.4.0-RC3

05 Feb 11:53
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3.4.0-RC3 Pre-release
Pre-release

Backported fixes

  • Sync language.scala with main and backport "Add tests for context bounds migration" #19515
  • Handle default implicits to context parameters under -3.4-migration #19512

Contributors

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

According to git shortlog -sn --no-merges 3.4.0-RC2..3.4.0-RC3 these are:

     4	Paweł Marks
     1	Martin Odersky
     1	Nicolas Stucki

3.4.0-RC2

23 Jan 13:22
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3.4.0-RC2 Pre-release
Pre-release

Backported fixes

  • Fix expandParam's use of argForParam/isArgPrefixOf. #19412
  • Remove ascriptionVarargsUnpacking as we never used it #19399
  • Make explicit arguments for context bounds an error from 3.5 #19316
  • Avoid generating given definitions that loop #19282
  • Turn given loop prevention on for -source future #19392
  • Fix algorithm to prevent recursive givens #19411

Contributors

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

According to git shortlog -sn --no-merges 3.4.0-RC1..3.4.0-RC2 these are:

    15	Martin Odersky
     4	Nicolas Stucki
     3	Paweł Marks
     1	Dale Wijnand
     1	Jan Chyb

3.4.0-RC1

22 Dec 15:25
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3.4.0-RC1 Pre-release
Pre-release

Highlights of the release

  • Make polymorphic functions more efficient and expressive #17548
  • SIP-56: Better foundations for match types #18262
  • Make SIP 54 (Multi-Source Extension Overloads) a standard feature #17441
  • Value parameter inference for polymorphic lambdas #18041
  • Add @publicInBinary annotation and -WunstableInlineAccessors linting flag #18402
  • Stabilize Quotes defn.PolyFunction #18480
  • Stabilize Quotes Flags.AbsOverride #18482
  • Add -experimental compiler flags #18571
  • Stabilize SIP-53 (quote pattern explicit type variable syntax) #18574
  • Add reflect TypeRepr.dealiasKeepOpaques #18583
  • Add attributes section to TASTy and use it for Stdlib TASTy #18599
  • Error when reading class file with unknown newer jdk version #18618
  • Add support for xsbti.compile.CompileProgress #18739
  • Improve type inference for functions like fold #18780
  • Improve error message for mismatched tasty versions, allow configuration of header unpickler #18828
  • In 3.4 make refutable patterns in a for comprehension an error #18842
  • Disallow use of PolyFunction in user code #18920
  • Store source file in TASTY attributes #18948
  • First step to pipelining support - enable reading Java symbols from TASTy #19074
  • Activate constrainResult fix in 3.4 #19253
  • Parallelise JVM backend - Scala 2 port #15392

Deprecation warnings for old syntax

Other changes and fixes

Backend

  • Count size of parameters for platform limit check #18464
  • Don't emit line number for synthetic unit value #18717
  • Avoid too eager transform of $outer for lhs & accessor rhs #18949
  • Make more anonymous functions static #19251
  • Fix deadlock in initialization of CoreBTypes using Lazy container #19298
  • Fix #18769: Allow HK type args in Java signatures. #18883
  • Loading symbols from TASTy files directly #17594
  • Use dedicated equals method for univerval equality of chars #18770

Erasure

  • Get generic signature of fields entered after erasure from their accessor #19207
  • Detect case where two alternatives are the same after widening ExprTypes #18787
  • Improve erased params logic #18433

Experimental: Capture Checking

  • Fix capture set variable installation in Setup #18885
  • Don't follow opaque aliases when transforming sym info for cc #18929
  • Reset comparersInUse to zero in ContextState.reset #18915
  • Special handling of experimental.captureChecking import #17427
  • Change handling of curried function types in capture checking #18131
  • Fix #18246: correctly compute capture sets in TypeComparer.glb #18254
  • New capture escape checking based on levels #18463
  • A more robust scheme for resetting denotations after Recheck #18534
  • A more flexible scheme for handling the universal capability #18699
  • Fix potential soundness hole when adding references to a mapped capture set #18758
  • Alternative scheme for cc encapsulation #18899
  • Make reach refinement shallow #19171

F-bounds

  • Don't check bounds of Java applications in Java units #18054

GADTs

  • Avoid embedding SelectionProtos in Conversions #17755
  • Freeze constraints while calculating GADT full bounds #18222

Implicits

  • Followup fix to transparent inline conversion #18130
  • Select local implicits over name-imported over wildcard imported #18203
  • Fix how implicit candidates are combined #18321
  • Improve error message about missing type of context function parameter #18788
  • Support implicit arguments before extractor method #18671
  • Tweak convertible implicits fix #18727

Incremental Compilation

  • Make incremental compilation aware of synthesized mirrors #18310

Inference

  • Honour hard unions in lubbing and param replacing #18680

Infrastructure

  • Use -Yscala2-library-tasty to add Scala 2 lib TASTY to scalac (internal only) #18613
  • Rename stdlib-bootstrapped-tasty to scala2-library-tasty #18615
  • Fix #19286: Freeze rubygems-update at < 3.5.0. #19288

Initialization

  • Fix #17997: Handle intersection type as this type of super type #18069
  • Add test for issue #17997 affecting the global object initialization checker #18141
  • Fix i18624 and add test case for it #18859
  • Treat new Array(0) as immutable #19192
  • Fix #18407: Ignore Quote/Slice in init checker #18848
  • Check safe initialization of static objects #16970
  • Pattern match support in checking global objects #18127
  • Fix crash in global object initialization checker when select target has no source #18627
  • Fix warning underlining in global init checker #18668
  • Fix i18629 #18839
  • I18628 #18841
  • Make safe init checker skip global objects #18906
  • Handle local lazy vals properly #18998

Inline

  • Fix regression: inline match crash when rhs uses private inlined methods #18595
  • Add structural classes of dynamicApply before inlining #18766
  • Set missing expansion span for copied inlined node #18229
  • Fix callTrace of inlined methods #18738

Linting

  • Keep tree of type ascriptions of quote pattern splices #18412
  • Fix false positive in WUnused for renamed path-dependent imports #18468
  • Fix false positive in WUnused for renamed path-dependent imports (2) #18617
  • Fix wunused false positive on CanEqual #18641
  • Implement -Xlint:private-shadow, type-parameter-shadow #17622
  • Fix: reversed wconf parsing order to mirror scala 2 #18503
  • Revert Fix false positive in WUnused for renamed path-dependent imports #18514

Macro Annotations

  • Enter missing symbols generated by the MacroAnnotation expansion [#18826](https://git...
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3.3.2-RC1

19 Dec 16:05
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3.3.2-RC1 Pre-release
Pre-release

Highlights of the release

  • Improvements to code coverage (detailed list below)
  • Add Stable Presentation Compiler #17528

Other changes and fixes

Backend

  • Make sure synthetic apply methods are generated in deterministic order #18210

Coverage

  • Only lift inner expressions when lifting repeated Typed arguments #18424
  • Fix: scoverage statement's line number should be 1-base #18932
  • Do not lift applications of context functions #18498
  • Don't lift the argument of a synchronized block in scoverage #16941
  • Fix the issue with coverage inside of a TypeApply #18420
  • Coverage: mark case bodies as branches; don't ignore branches with synthetic spans #18437

Documentation

  • Compiler plugin Scaladoc: document phase requirement #18394

Exports

  • Refine override exclude criterion for export forwarders #17590

Incremental Compilation

  • Fix overcompilation due to unstable context bound desugaring #18280

Inline

  • Don't generate a super accessor for an inline method call #17598

Linting

  • Wunused: Only use type treverser for checking refinements in refined type trees #17929

Parser

Pattern Matching

  • Properly refine type of inlined unapply pattern #18292

Presentation Compiler

  • Bugfix: suggest correct arg name completions for lambda expressions #18379
  • Improvement: print better bracket suffix in completion item label #18380
  • Fix presentation compiler autoimports, update presentation compiler dependencies #18264
  • Update scala3-presentation-compiler to 39e349e #18296
  • Update presentation compiler with changes from PR 5287 #18301
  • Update presentation compiler to a829a6a #18347
  • Bugfix: highlight enum cases correctly #18362

Quotes

  • Do not beta-reduce/eta-expand pattern splices with contextual function types #18198
  • XcheckMacro types of Block expression and Apply/TypeApply function #18242
  • Fix owner of splices in class statements #18359
  • Handle macro dependencies through class of this #18396
  • Add missing span in QuoteMatcher #18178
  • Fix stale symbol crashes in some path depended types in macro contexts #18077
  • Simplify avoidance of local types of Hole #17571

Reporting

  • Detail "not a constant type" message #17626
  • Suggest imports for the expected type of the underlying implicit not found error #17976
  • Fix: report correct location on a repeat modifier #17982
  • Warn when calling synchronized on AnyVal #18021
  • Fix compile error message in wildcard exports #18189
  • Improve parameter type inference error messaging #18190
  • Don't report warnings in migration when performing rewrites #15589
  • Fix crash reporter, units and phases #17754
  • Omit more prefixes in non-package module printing #17758
  • Fix pretty printer to handle using and erased modifier #17952
  • Add -Yprint-tasty compiler flag #17986
  • Add actionable item to PatternMatchExhaustivity diagnostic #18314

Scaladoc

  • Fix: -no-link-warnings does not work #17028
  • Fix: Validation for API link #17099
  • Scaladoc: type rendering fixes and improvements #17213
  • Feat: Add a custom icon #17241
  • Fix: Correction of the siteRoot path #17297
  • Fix: Correct the navigation to anchor #17910
  • Fix: Style for wiki syntax #18079
  • Fix NoSuchElementException in scaladoc #18184

SemanticDB

  • Check for primary constructor in namePresentInSource #18325
  • Add -semanticdb-text compiler option #18307

Typer

  • Fix pattern generation in "ordinal" mirror method #17570
  • Fix superType of SuperType #17574
  • Avoid crash in erasure when reference cannot be emitted #18056
  • Disallow overloading from breaking stable patterns #18327
  • Fix widen types before checking an implicit view exists #18719
  • Properly handle SAM types with wildcards #18201
  • Handle recursion in collectParts #18214
  • Allow eta-expansion of inline defs #18249
  • Stable names for lambda lifted methods #18281

Contributors

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

According to git shortlog -sn --no-merges 3.3.1..3.3.2-RC1 these are:

    37 Nicolas Stucki
    36 Paweł Marks
    28 Chris Kipp
    15 Sébastien Doeraene
    13 Lucas Leblanc
    13 Martin Odersky
    12 Guillaume Martres
    10 Dale Wijnand
    10 Jamie Thompson
     8 ghostbuster91
     6 Florian3k
     5 Kacper Korban
     4 Jędrzej Rochala
     4 Katarzyna Marek
     4 Quentin Bernet
     3 Jan Chyb
     3 Lucas
     3 Matt Bovel
     3 Seth Tisue
     2 Julien Richard-Foy
     2 Wojciech Mazur
     1 Aleksey Troitskiy
     1 Arnout Engelen
     1 Bjorn Regnell
     1 Eugene Yokota
     1 Justin Reardon
     1 Kisaragi
     1 Martin Kučera
     1 Matthew Rooney
     1 Matthias Kurz
     1 Ondrej Lhotak
     1 Rikito Taniguchi
     1 Stefan Wachter
     1 Yuito Murase
     1 rochala

3.3.1

07 Sep 21:35
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Highlights of the release

  • Support records in JavaParsers #16762
  • Port JVM backend refactor from Scala 2 #15322

Other changes and fixes

Backend

  • Disallow mixins where super calls bind to vals #16908
  • Fix #15107: Avoid re-emitting a LineNumber after only LabelNodes. #16813

Coverage

  • Fix #17042: Preserve the shape of secondary ctors in instrumentCoverage. #17111

Default parameters

  • Dupe fix when finding default arg getters #17058

Documentation

  • Fix: ensure syntax blocks for ebnf are marked as such #16837

Erasure

  • Handle @companionClass and @companionMethod meta-annotations #17091

Extension Methods

  • Support extension methods imported from different objects #17050

GADTs

  • Fix tuple member selection so it works with GADT healing #16766
  • Fix upper bound constraints, that are higher-kinded #16744
  • Split out immutable GadtConstraint #16602

Implicits

  • Improve subtyping check for not yet eta-expanded higher kinded types #17139
  • Harden tpd.Apply/TypeApply in case of errors #16887
  • Try to be more subtle when inferring type parameters of class parents #16896
  • Include P in the implicit scope of P.this.type #17088

Incremental Compilation

  • Fix under-compilation when the method type in a SAM changes #16996

Infrastructure

  • Set reference version to 3.3.0-RC6 #17504
  • Fix #17119: Download Coursier from GitHub directly #17141

Inline

  • Remove NamedArg from inlined arguments #17228
  • Don't generate a Select for a TermRef with NoPrefix #16754
  • Prepare bodies of inline forwarders eagerly #16757
  • Do not remove inline method implementations until PruneErasedDefs #17408

Java Interop

  • ClassfileParser: allow missing param names (for JDK 21) #17536

Linting

  • Improve -Wunused: locals, privates with unset vars warning #16639 #17160
  • Fix wunused false positive when deriving alias type #17157
  • Port -Wnonunit-statement setting for dotty #16936

Match Types

  • Normalize match type usage during implicit lookup #17457
  • Fix #13757: Explicitly disallow higher-kinded scrutinees of match types. #17322
  • Fix match type reduction with wildcard type arguments #17065
  • Fix check whether classtag can be generated for match types #16708

Parser

  • Allow lines starting with . to fall outside previous indentation widths #17056

Pattern Matching

  • Fix #11541: Specialize ClassTag[T] in exhaustivity check #17385
  • Check outer class prefixes in type projections when pattern matching #17136
  • Make unchecked cases non-@unchecked and non-unreachable #16958
  • Fix #16899: Better handle X instanceOf P where X is T1 | T2 #17382

Pickling

  • ClassfileParser: Avoid cycle when accessing companion in inner class lookup #16882

Polyfunctions

  • Fix type aliases in beta-reduction of polyfunctions #17054

Quotes

  • Register paramProxy and thisProxy in Quote type #17541
  • Only check newVal/newMethod privateWithin on -Xcheck-macros #17437
  • Unencode quote and splice trees #17342
  • Correctly type Expr.ofTupleFromSeq for arity > 22 #17261
  • Use TermRef to distinguish distinct Type[T] instances #17205
  • Check level consistency of SingletonTypeTree as a type #17209
  • Fix splice type variable pattern detection #17048
  • Avoid creation of @SplicedType quote local refrences #17051
  • Dealias type references when healing types in quotes #17049
  • Replace quoted type variables in signature of HOAS pattern result #16951
  • Beta-reduce directly applied PolymorphicFunction #16623
  • Use Object.toString for quoted.{Expr, Type} #16663
  • Fix Splicer.isEscapedVariable #16838
  • Fix references to class members defined in quotes #17107
  • Handle pickled forward references in pickled expressions #16855
  • Fix #16615 - crashes of path dependent types in spliced Type.of #16773
  • Disallow local term references in staged types #16362
  • Refactor level checking / type healing logic #17082
  • Dealias quoted types when staging #17059
  • Fix quotes with references to path dependent types #17081
  • Make arguments order in quote hole deterministic #17405
  • Only transform the body of the quote with QuoteTransformer #17451
  • Place staged type captures in Quote AST #17424
  • Add SplicePattern AST to parse and type quote pattern splices #17396

Reflection

  • -Xcheck-macros: add hint when a symbol in created twice #16733
  • Assert that symbols created using reflect API have correct privateWithin symbols #17352
  • Fix reflect.LambdaType type test #16972
  • Improve New/Select -Ycheck message #16746
  • Improve error message for CyclicReference in macros #16749
  • Add reflect defn.FunctionClass overloads #16849

REPL

  • Always load REPL classes in macros including the output directory #16866

Reporting

  • Improve missing argument list error #17126
  • Improve implicit parameter error message with aliases #17125
  • Improve "constructor proxy shadows outer" handling #17154
  • Clarify ambiguous reference error message #16137
  • Hint about forbidden combination of implicit values and conversions #16735
  • Attach explanation message to diagnostic message #16787
  • Propagate implicit search errors from implicit macros #16840
  • Detail UnapplyInvalidReturnType error message #17167
  • Add way to debug -Xcheck-macros tree checking #16973
  • Enrich and finesse compiler crash reporting #17031
  • Allow @implicitNotFound messages as explanations #16893
  • Include top-level symbols from same file in outer ambiguity error #17033
  • Do not issue deprecation warnings when declaring deprecated case classes #17165

Scala-JS

  • Fix #17344: Make implicit references to this above dynamic imports explicit. #17357
  • Fix #12621: Better error message for JS trait ctor param. #16811
  • Fix #16801: Handle Closure's of s.r.FunctionXXL. #16809
  • Fix #17549: Unify...
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