3.3.4

Highlights of the release

• Error when reading class file with unknown newer jdk version #18618
• Add support for xsbti.compile.CompileProgress #18739
• Add support for @deprecatedInheritance #19082
• Bump JLine 3.19.0 -> 3.24.1 & sbt 1.9.7 -> 1.9.9 #19744
• Repl - method signatures in autocomplete #19917
• Upgrade Scala 2 to 2.13.14 (was 2.13.12) #20902

Notable changes

• Backport of #20463 corrects generic signatures emitted in the JVM bytecode for value classes and aligns it with Scala 2.13 semantics. The previously generated signatures for value classes were invalid - they contained underlying value class type instead of boxed type. This change would lead to MiMa errors when signature checks are enabled and could lead to issues when trying to refer to value class methods using reflection API. It would not affect the normal usage of value classes in Scala code compiled with the previous version of the compiler.

Other changes and fixes

Annotations

• Attempt implicit search for old style implicit parameters in Application matchArgs #19737

Artifacts

• Add versionLine marker to pom.xml #19986
• Avoid duplications of properties in pom.xml #20020

Backend

• Parallelise JVM backend - Scala 2 port #15392
• Fix Closure span assignment in makeClosure #15841
• Count size of parameters for platform limit check #18464
• Opt: Get rid of the LiftTry phase; instead handle things in the back-end. #18619
• Update asm to 9.6 #18712
• 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(#17255): cannot find Scala companion module from Java #19773
• Change isStatic to isStaticOwner in hasLocalInstantiation #19803
• Emit switch bytecode when matching unions of a switchable type #20411
• Fix EnclosingMethod for lifted anonfun #20558
• Fix deterministically adding additional interfaces #20593

Coverage

• Correctly prettify names in coverage info #18542
• Port coverage filter options for packages and files #19727

Default parameters

• Lift all non trivial prefixes for default parameters #19739
• Fix default args lookup for given classes #20256
• Fix implicit search failure reporting #20261

Derivation

• Fix infinite loop in Mirror synthesis of unreducible match type #20133

Desugaring

• Make apply proxies work with overloaded ctors #19464
• Fix possible crash in Desugar #19567
• Add explanation to checkCaseClassInheritanceInvariant error msg #20141

Documentation

• [spec] remove implementation details from enum spec #18579
• [spec] some fixes to tuples #18582
• [spec] Cosmetic changes in the lexical syntax chapter #18608
• Spec: Update the list of tokens that can start/end statements. #18611
• Update syntax.md #18648
• Sync main with language-reference-stable #18718
• Completion assert diffs will now show completion source #18890
• Fix Export Doc #18952
• reference doc: fix incorrect syntax production #19017
• State all known limitations of right-associative extension methods #19210
• Update explicit-nulls.md #19327
• update old issues.scala-lang.org url #19606
• Update syntax.md #19670
• Clear the not-backported documentation changes queue #19699
• remove implementation from asInstanceOf #19753
• Port tailrec spec and adjustments to annotations section #19978
• Optimize the documentation JS files #20075
• Optimize main.js #20093
• Improve documentation of implicit conversions #20103
• Update Quotes.scala #20174
• Supplement structural givens doc #20327
• Fix three dead links in spec Types doc chapter #20337
• Avoid jpath in example #20775

Erasure

• Make eraseInfo work for classes with EmptyScopes #19550
• Don't re-balance AndTypes arising from supertypes #20400

Exports

• Do not propagate @tailrec to exported methods #19509
• Fix retained flags in exports #19636
• Add annotations in parameters for exports #20140
• Fix isAliasType #20195

GADTs

• Only cache base types when gadt state is empty #19562

Implicits

• Tweak convertible implicits fix #18727
• Run CheckStatic after UncacheGivenAliases #19318
• Add tests to verify that crash is fixed elsewhere. Fixes #19328 #19329
• Don't search for implicit conversions to NoType #19563
• Prefer extensions over conversions for member selection #19717
• Adjust owner in Interactive.contextOfPath causing crash in ImplicitSearch #19875
• Improve ConstraintHandling of SkolemTypes #20175
• Better error diagnostics under -explain-cyclic #20251
• Bring back ambiguity filter when we report an implicit not found error #20368
• Avoid stacked thisCall contexts #20488

Incremental Compilation

• Fix undercompilation upon ctor change #19911
• Retain default parameters with export #20167

Inferencing

• Adapt toInstantiate in interpolateTypeVars to consider #20399 #20426

Infrastructure

• Fix listing release versions for bisect script. #19356
• Make tests resilient to exceptions thrown while reporting exceptions #19566
• Move CI management from lampepfl/dotty-ci #19697
• Switch to Java 17 in the CI #19703
• [regression] Publish nightly releases and releases using Java 8 #19722
• Bump scalacenter/sbt-dependency-submission from 2 to 3 #20440

Inline

• Fix regression: inline match crash when rhs uses private inlined methods #18595
• Add structural classes of dynamicApply before inlining #18766
• Inline transparent implicit parameters when typing Unapply trees #19646
• Specialized retained inline FunctionN apply methods #19801
• Restore pre-3.3.2 behavior of inline implicit def #19877
• Avoid crash after StopMacroExpansion #19883
• Check deprecation of inline methods #19914
  ...

3.3.4-RC4

Reverted changes

• Revert "Reduce projections of type aliases with class type prefixes" in LTS #21609

Contributors

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

According to git shortlog -sn --no-merges 3.3.4-RC3..3.3.4-RC4 these are:

     4  Wojciech Mazur

3.5.2-RC1

Highlights of the release

• Add the -Wall option that enables all warnings (Plan B) #20577
• Add origin filter to WConf, DeprecationWarning #21404

Other changes and fixes

Implicits

• Streamline tryNormalize with underlyingMatchType #20268

Infer

• Fix #20521: Optimise caching for computing atoms and widened in OrTypes #21223

Infrastructure

• Add the project's icon for Intellij #21188
• Add the link to scala's security policy #21220
• Add _spec to dependabot #21227
• Bump redcarpet from 3.5.1 to 3.6.0 in /docs/_spec #21231
• Bump webrick from 1.7.0 to 1.8.1 in /docs/_spec #21232
• Bump VirtusLab/scala-cli-setup from 1.4.0 to 1.4.1 #21233
• Bump VirtusLab/scala-cli-setup from 1.4.1 to 1.4.3 #21371
• Bump VirtusLab/scala-cli-setup from 1.4.3 to 1.5.0 #21441
• Update ScAS #21283
• Bump hamzaremmal/sdkman-release-action from 4cb6c8cf99cfdf0ed5de586d6b38500558737e65 to 1f2d4209b4f5a38721d4ae20014ea8e1689d869e #21440

JVM Backend

• Update asm to patched 9.7 #20144

Overloading

• Report only non-overridden unimplemented members #21337

Parser

• SimplePattern errors should now be recovered as wildcard instead of unimplemented expr #21438

Pattern matching

• Fix a bundle of patmat issues #21000

Positions

• Fix trailing comma Ident's span #20445

Presentation Compiler

• fix: don't use color codes for pattern match code action #21120
• fix: don't add suffix if brackets already present #21259
• Backport from metals #21196
• change mock symbol search #21296
• fix: completions when parenthesis already provided #21299
• Weekly metals backport #21343
• Help implement Metals' infer expected type feature #21390
• feat: Implement completions for named tuple fields #21202

Runner

• Wrap the arguments passed to the scalac task between " #21322

REPL

• Allow JLine to fall back to a dumb terminal #21330

Semantic DB

• fix: semanticdb symbol creation when targetName set #20950

Tasty Format

• add child to parent in completion context #21214

Transform

• Fix #20856: Serialize Waiting and Evaluating as if null. #21243

Typeclass Derivation

• Revert "Compensate loss of transitivity" #21356

Typer

• Avoid forcing ctors & parents which caused cycles #17086
• Fix isomorphism tests of AndOrTypes under non-empty BinderPairs #21017
• Fail when a poly function value has a different number of type params than the expected poly function #21248
• Fail early & more clearly on shaded-broken classfiles #21262
• A tweak to type improvement #21312
• Fix #20897: Make Nothing ⋔ Nothing, as per spec. #21241

Experimental Changes

Modularity

• fix: Only implement a deferred given in a class if its parent won't implement it #21206

Named Tuples

• Re-use isConcrete checking in match types for NamedTuple.From #20947
• fix: Dealias NamedTuple's name types when resolving NamedTuple's element types #21331

Safe Global Initialization

• Fix exception on sequence matching with drop #21281
• Fix uninitializing fields when evaluating a cached constructor call in global initialization checker #21403

Contributors

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

According to git shortlog -sn --no-merges 3.5.1..3.5.2-RC1 these are:

  21  Dale Wijnand
  12  Eugene Flesselle
  11  Katarzyna Marek
    6  dependabot[bot]
    5  Wojciech Mazur
    4  Hamza REMMAL
    4  Kacper Korban
    4  Martin Odersky
    4  Som Snytt
    4  Yichen Xu
    4  kasiaMarek
    3  Jamie Thompson
    2  EnzeXing
    2  Hamza Remmal
    2  Sébastien Doeraene
    1  Jan Chyb
    1  Jędrzej Rochala
    1  Kavin Satheeskumar
    1  Martin Duhem
    1  Matt Bovel
    1  Raphael Jolly
    1  noti0na1
    1  philippus

3.5.1

Highlights of the release

• Add sources of synthetic classes to sources jar #20904

Other changes and fixes

Annotations

• Preventing compilation of a @tailrec method when it does not rewrite, but an inner method does #20143
• #20145 - bugfix when a return tailrec is called inside a val def. #20652

Backend

• Fix EnclosingMethod for lifted anonfun #20558
• Emit switch bytecode when matching unions of a switchable type #20411
• Fix deterministically adding additional interfaces #20593
• Emit generatedNonLocalClass in backend when callback is not enabled #21186

Documentation

• Avoid jpath in example #20775
• Chore: Fix doc link in clauseInterleaving docstring #20590
• Chore: fix doc link in namedTuples docstring #20770

Erasure

• Don't re-balance AndTypes arising from supertypes #20400

GADTs

• Harden GADT constraint handling to survive illegal F-bounds #20325

Inferencing

• Adapt toInstantiate in interpolateTypeVars to consider #20399 #20426

Infrastructure

• Update addToBackportingProject.scala #20461
• Simple scripts to run non-bootstrapped compiler after 'sbt buildQuick' #19894
• Bump from 3.4.0 to 3.5.0-RC1 for MiMA #20404
• Set reference version to 3.5.0-RC4 #21175
• Bring back windows performance improvements #20423
• Bump scalacenter/sbt-dependency-submission from 2 to 3 #20440
• Fix incorrect paths to sha256 check sum files in release workflow #20709
• Bump VirtusLab/scala-cli-setup from 1.3.2 to 1.4.0 #20906

Inline

• Mark genSJSIR as disabled (rather than non-runnable) when no -scalajs. #20815
• Map over refs of ImportTypes in TypeMap #20837

Initialization

• More principled filtering of abstract values in initialization check #20548

Match Types

• TryCompiletimeConstantFold in disjointnessBoundary #20168

Pattern Matching

• Fix #20372: Check pattern match exhaustivity in inlined code #20403

Presentation Compiler

• Add pattern completion for unapply contexts #20274
• Bugfix: Exclude newer LSP4j, which is built on JDK 11 #20771
• Chore: Bump mtags to latest stable #20442
• Weekly metals backport #20542
• Port pc find references from metals #20544

Quotes

• Add regression test for issue 20309 #20387

REPL

• Only consider methods with 0 parameters in valueOf #20543

Reflection

• Fix erasure crash for Inlined rhs of a context function closure #20398
• Fix #20458: do not expose ClassInfo in quotes reflect widenTermRefByName #20468

Reporting

• Fix error message on setter with wrong type #20444
• Add a specific error message for local final defs #20557
• Explain unresolvable references better #20477
• Add error code to diagnostics about unused code #19780
• Better error diagnostics for illegal match cases #20905

Runner

• Bump scala-cli to 1.4.1 + drop old cli management #21234
• Bump scala-cli to 1.4.3 #21338

Scaladoc

• Fix handling of right associative extension methods across scaladoc and printers #20467

Specification

• Add binary lits to syntax summaries #19551

Settings

• Enhance help message for language flag #20247
• Accept legacy language features #20454
• Set default source version to 3.5 #20435

Tooling

• Improve source positions emited for synthetic unit in if-conditions #20431
• Adjust the API name entry for nested classes #20279
• Fix declaring product of straight-to-jar compilation #20592

Transform

• Correct Java signature for value classes appearing in type arguments #20463

Typer

• Retry constraint.replace after constraint.updateEntry #20399
• Add special handling for comparisons with Singleton types #20474
• Reinstantiate restriction to transparent inline methods #20371
• Add regression test for #20288 fixed in #20527 #20857
• Fix isEffectivelySingleton #20486
• Fall back to direct subtype comparison at the end in dropIfSuper and dropIfSub #20523
• Mark AppliedType cachedSuper valid Nowhere when using provisional args #20527
• Fix healAmbiguous to compareAlternatives with disambiguate = true #21372

Experimentqal Changes

Capture Checking

• Fix soundness hole of forgotten reach capabilities #20524
• Drop @capability annotations #20396
• Fix symbol reference retrivial for scala.caps.Caps #20493
• Refactor adaptBoxed #20525
• Fix error related to reaches when using scala2-library-cc-tasty #20528

Named tuples

• Make NamedTuple.Empty an alias to NamedTuple #20502
• Move NamedTuple methods to separate scope. re-export #20504
• WidenDealias before extracting namedTupleElementTypes #20505
• Improve type inference for literal named tuples #20497
• Fix issue #20267 with regression test #20506
• Only set AppliedType#validSuper after AppliedType#cachedSuper #20553
• Fix NamedTuple selection on an unstable prefix #20455
• Allow apply adaptation on Selectable with Fields #20489

Contributors

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

According to git shortlog -sn --no-merges 3.5.0..3.5.1 these are:

    82  Martin Odersky
    29  Wojciech Mazur
    22  Hamza REMMAL
    16  Jamie Thompson
    15  Eugene Flesselle
    14  Hamza Remmal
    13  noti0na1
     9  Katarzyna Marek
     7  Fengyun Liu
     7  Jan Chyb
     6  Dale Wijnand
     6  Guillaume Martres
     5  Som Snytt
     4  dependabot[bot]
     3  Adrien Piquerez
     3  Derek Wickern
     3  Matt Bovel
     3  OlegYch
     2  Florian3k
     2  Kacper Korban
     2  Lucy Martin
     2  Paweł Marks
     2  Tomasz Godzik
     1  Arnout Engelen
     1  Eugene Yokota
     1  João Ferreira
     1  Kasper Kondzielski
     1  Lucas Nouguier
     1  Lukas Rytz
     1  Mikołaj Fornal
     1  Nafer Sanabria
     1  Natsu Kagami
     1  Seth Tisue
     1  Sébastien Doeraene

3.3.4-RC3

Reverted changes

• Revert pattern matching improvements introducing regressions in 3.3.4 #21573

Contributors

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

According to git shortlog -sn --no-merges 3.3.4-RC2..3.3.4-RC3 these are:

     4  Wojciech Mazur

3.3.4-RC2

Backported fixes

• Fix a bundle of patmat issues #21000
• Fixed false positive unreachable local object #21532
• Reimplement support for type aliases in SAM types #18317
• Allow SAM types to contain match alias refinements #20092
• Allow SAM types to contain multiple refinements #20172

Contributors

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

According to git shortlog -sn --no-merges 3.3.4-RC1..3.3.4-RC2 these are:

    11  Dale Wijnand
     7  Wojciech Mazur
     1  Guillaume Martres

3.4.3

Highlights of the release

• Revert "Approximate MatchTypes with lub of case bodies, if non-recursive" in 3.4.3 #21268

Contributors

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

According to git shortlog -sn --no-merges 3.4.2..3.4.3 these are:

    8  Wojciech Mazur

3.5.1-RC2

Backported fixes

• Update MiMa and Reference Version to 3.5.0 #21374
• Fix healAmbiguous to compareAlternatives with disambiguate = true #21372
• Bump scala-cli to 1.4.1 + drop old cli management #21234
• Bump scala-cli to 1.4.3 #21338
• Emit generatedNonLocalClass in backend when callback is not enabled #21186

Reverted changes

• Heal member-select on opaque reference #21340
• Approximate MatchTypes with lub of case bodies, if non-recursive #21267

Contributors

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

According to git shortlog -sn --no-merges 3.5.1-RC1..3.5.1-RC2 these are:

    8  Wojciech Mazur
    5  Hamza REMMAL
    5  Martin Odersky
    2  Eugene Flesselle
    2  Jamie Thompson
    1  Dale Wijnand

3.5.0

Highlights of the release

• Bundle scala-cli in scala command #20351
• Introduce Best Effort compilation options #17582
• Add support for Pipelined builds #18880
• Add support for var in refinements #19982
• Implement SIP-42 - Support for binary integer literals #19405

Note

Installation of a new Scala runner using Coursier requires it to be updated or reinstalled to Coursier 2.1.10 or above. Earlier versions did not support installing native packages, defaulted to the old runner JAR.

Other changes and fixes

Backend

• Fix Closure span assignment in makeClosure #15841

Default parameters

• Fix default args lookup for given classes #20256
• Fix implicit search failure reporting #20261

Derivation

• Fix infinite loop in Mirror synthesis of unreducible match type #20133

Desugaring

• Add explanation to checkCaseClassInheritanceInvariant error msg #20141

Exports

• Add annotations in parameters for exports #20140
• Fix isAliasType #20195

Implicits

• Fix implicitNotFound message for type aliases #19343
• Normalize types before collecting parts determining implicit scope #20077
• Better error diagnostics under -explain-cyclic #20251
• Update unreducible match types error reporting #19954
• Improve ConstraintHandling of SkolemTypes #20175

Incremental Compilation

• Retain default parameters with export #20167

Inline

• Fix by-name parameter in beta-reduction #20096
• Add warning for anonymous inline classes (#16723) #20291
• Avoid conversion of Unit type into () term #20295
• Type desugared transparent inline def unapply call in the correct mode #20108
• Regression: fix compilation performance on Windows #20193
• Fix inline match on blocks with multiple statements #20125
• Inline unapplys in the inlining phase #19382
• Fix outerSelect in Inliner #20313

Linting

• Fix #20146: attach the original name if there is an import selection for an indent #20163
• Add regression test for issue 18632 #20308

Match Types

• Make aliases of MatchAliases normal TypeAliases #19871
• Fix #19746: Do not follow param term refs in isConcrete. #20015
• Do match type reduction atPhaseNoLater than ElimOpaque #20017
• Do not flag match types as Deferred and amend #20077 #20147
• Always use baseType when constraining patternTp with scrutineeTp #20032
• Use MirrorSource.reduce result for companionPath #20207
• Regression: Fix match type extraction of a MatchAlias #20111
• Revert "Approximate MatchTypes with lub of case bodies, if non-recursive" in 3.5.0 #21266

Polyfunctions

• Discard poly-functions when trying to resolve overloading #20181

Presentation Compiler

• Stabilise returned completions by improving deduplication + extra completions for constructors #19976
• Fix active param index for empty param lists #20142
• Delias type members in hover #20173
• Interactive: handle context bounds in extension construct workaround #20201
• Fix: prefer non-export definition locations #20252
• Don't show enum completions in new keyword context #20304
• Chore: Backport changes for presentation compiler #20345
• Add custom matchers for completions (fuzzy search for presentation compiler) #19850

Quotes

• Fix TermRef prefixes not having their type healed #20102
• Improve reporting in staging about the possible use of an incorrect class loader #20137
• Introduce MethodTypeKind to quotes reflection API #20249
• Add quote ASTs to TASTy #20165

Reflection

• Allow to beta reduce curried function applications in quotes reflect #18121
• Set the inlining phase in the Context used for checking macro trees #20087
• Add Symbol.isSuperAccessor to reflection API #13388
• Stabilize reflect SymbolMethods.isSuperAccessor #20198

Repl

• Fix validity period of derived SingleDenotations #19983
• Fix #18383: Never consider top-level imports as unused in the repl. #20310

Reporting

• Warn if extension receiver already has member #17543
• Deprecation of case class elements #17911
• Support src filter in -WConf (Closes #17635) #18783
• Add note about type mismatch in automatically inserted apply argument #20023
• Make error reporting resilient to exception thrown while reporting #20158
• Remove duplicate comma from Matchable selector warning #20159
• Generalize warnings for top-level calls to Any or AnyRef methods #20312
• Make CheckUnused not slow. #20321
• Bring back ambiguity filter when we report an implicit not found error #20368
• Treat 3.5-migration the same as 3.5 for a warning about implicit priority change #20436
• Priority warning fix alternative #20487
• Use final result type to check selector bound #20989
• Refine implicit priority change warnings #21045
• Backport "Fix healAmbiguous to compareAlternatives with disambiguate = true" to 3.5.0 #21344

Rewrites

• Patch indentation when removing braces (and other bug fixes in -indent -rewrite) #17522
• Extra check to avoid converting block expressions on the rhs of an in… #20043

Scaladoc

• Fix scaladoc crash on Windows - illegal path character #20311
• Scaladoc: improve refined function types rendering #20333
• Relax font-weight reset #20348

Scala JS

• Optimize main.js #20093

Settings

• Lift Scala Settings from experimental to stabilized #20199

Tooling

• Detect macro dependencies that are missing from the classloader #20139
• Write pipelined tasty in parallel. #20153
• ConsoleReporter sends INFO to stdout #20328
• Bundle scala-cli in scala command #20351
• Adapt the workflow to release on SDKMAN! #20535
• Adapt the release workflow to SIP-46 #20565
• Release .zip instead of .tar.gz for windows in sdkman #20630
• SIP 46 - read classpath from file, remove lib directory in distribution #20631
  .gz for windows in sdkman #20630
• Bump scala-cli to 1.4.0 [#20859](h...

3.5.0-RC7

Backported fixes

• Backport "Fix healAmbiguous to compareAlternatives with disambiguate = true" to 3.5.0 #21344

Contributors

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

According to git shortlog -sn --no-merges 3.5.0-RC6..3.5.0-RC7 these are:

     5  Martin Odersky
     4  Wojciech Mazur
     2  Eugene Flesselle