3.3.8 LTS

Highlights of the release

• Support for JDK 26 #24430
• Multiple coverage improvement to make it on par with Scala 2 support including
  // $COVERAGE-OFF$ and // $COVERAGE-ON$ markers.
• New @uncheckedOverride annotation for definitions that may override.
  #24545
• Trap Ctrl-C in the REPL: if no command is running clear the prompt, if some
  command is running ask for confirmation before exiting.
  #24127
• Numerous linting and presentation compiler improvements and fixes.
• New '-Yfuture-lazy-vals' options that allows to compile with new lazy val
  implementation compatible with all JDK 9+
  #637

Other changes and fixes

Access modifiers

• Check protected parent constructor accesses only occurs in child constructors
  #25511
• Fix protected constructor access
  #25523

Annotations

• Improve ref check of constructors
  #24342
• Also copy param annots at mixin
  #24916
• Named arg may be deprecatedName
  #21588
• Fix: emit deprecation warnings when a symbol is annotated by a deprecated
  annotation #23906
• Fix #20063: Java leading annotation parsing
  #25503
• Accommodate adapted Scala 2 annotation value
  #17516
• Regression test for #3403 #25521
• Fix: do not allow @targetName on primary constructor too
  #24682
• Add @uncheckedOverride annotation for definitions that may override
  #24545

Backend

• Chore: add regression test for #4528
  #24663
• Cast inline call results to result type, not method type
  #25111
• Regression tests for #25 #25536
• Enforce JVM UTF-8 string limits in the backend
  #25300
• Do not simplify isInstanceOf if unrelated types might be subtypes at run-time
  #25535
• Adjust purity of trait with lazy member
  #23788
• Use Objects.equals in translating ==
  #25314
• Fix generic signatures for mixin forwarders conflicting type parameter names
  #24567
• No mixin forwarder when ancestor is sealed
  #23482
• Simplify JVM interface list emission, remove a mini-phase
  #25203
• Chore: optimize lazy val with power of two
  #22428
• Fix infinite loop with bad section ends in TastyHeaderUnpickler
  #25676
• Fix TastyPrinter's JAR-walking logic to include subdirectories
  #25678

Classpath

• Skip module-info.class files during REPL tab-completion
  #24838
• Fix for #22461 Empty ClassPath attribute in one or more classpath jars causes
  crash #22462

Coverage

• Make coverage more similar to the one in Scala 2
  #23722
• Fix #25555: Preserve singleton precision during scoverage lifting
  #25556
• Fixes #25482: Ensure package transformation properly handles language imports
  in InstrumentCoverage #25546
• Bugfix: Fix issues with Scala JS and coverage
  #24769
• Make coverage support incremental compilation
  #24773
• Add support for local coverage on and off with // $COVERAGE-OFF$ and
  // $COVERAGE-ON$ #24486
• Improvement: Try to optimize coverage phase
  #24925
• Scoverage: do not instrument erased values
  #25298

Default parameters

• Fix named arguments evaluation order with by-name parameters
  #25161

Documentation

• Docs: Enforce links checks in the generated docs
  #25425
• Improve the contributing guide
  #25384
• Extend copyright into 2026
  #24927
• Update README: This is Scala 3
  #25424
• Explain implicit vs default args
  #25311
• Fix some scaladoc in compiler
  #24166
• Docs: fix task name for scaladoc/testOnly
  #23678
• Replace internal tab char in comment in Synthesizer.scala
  #23691

Enums

• Fix Java enum forwarders to pull from companion on initialization
  #24361
• Make enum apply ascriptions inferred types
  #25562

Exports

• Fix: look at the underlying of a TermRef for a getter
  #24565

Extension Methods

• Accept using right associative parameters
  #24766
• Add ctor proxies before exports
  #24884
• Fix pkg obj prefix of opaque tp ext meth
  #21527
• Better handling of illegal trees in extension
  #25368
• Fix LiftToAnchors for higher-kinded type applications
  #23672
• Prevent crash when extension not found
  #18830

GADTs

• Also trust TypeTest when there is a Bind
  #24568

Implicits

• Only check seen for LazyRef for TypeSizeAccumulator
  #20459
• Chore: add regression test for #8581
  #24666
• Fix "Regression in zio/zio-schema for typer/implicit resolution"
  #24156
• Fix implicit scope liftToAnchors for parameter lower bounds
  #23679

Inference

• Tweak type for tryParameterless
  #24716

Initialization

• Refine parameter adaptation logic for arrays
  #23591

Infrastructure

• Tweak tests to not fail under jdk 25
  #25148
• Bump actions/upload-artifact from 6 to 7
  #25423
• Bump actions/download-artifact from 7 to 8
  #25420
• Bump VirtusLab/scala-cli-setup from 1.12.2 to 1.12.3
  #25422
• Bump coursier/cache-action from 7 to 8
  #25220
• Bump actions/upload-artifact from 5 to 6
  #24758
• Bump actions/download-artifact from 6 to 7
  #24759
• Bump actions/checkout from 5 to 6
  #24517
• Bump actions/upload-artifact from 4 to 5
  #24268
• Bump actions/download-artifact from 5 to 6
  #24271
• Bump actions/download-artifact from 4 to 5
  #23711
• Bump actions/checkout from 4 to 5
  #23710
• Chore: bump sbt to 1.11.5 #23805
• Chore(deps): bump actions/setup-java from 4 to 5
  #23812
• Chore: Use numberOfWorkers instead
  #24338
• Improvement: Additional way of defining ENABLE_BSP_ALL_PROJECTS
  #24122
• Formatting: Format presentation-compiler with scalafmt
  #24977
• Ensure mistakes in CI inputs are caught early
  #25677

Inline

• Chore: add regression test for #22575
  #25337
• Ensure the inline match scrutinee type conforms to the recalculated type
  #24988
• Make containsOuterRefsAnywhere follow aliases
  #25214
• Find annotation args in inline expansion
  #24895
• Chore: add regression test for #10343
  #24668
• Improve the test for creating protected method accessors fo...

3.9.0-RC1

Highlights of the release

• Long Term Support
• Make into type and modifier stable #26184
• Remove automatic collection of entry points #25215
• Scaladoc: support expectations in snippets #25713
• Restore Automatic-Module-Name in standard library's manifest #26218

Other changes and fixes

Annotations

• Unify annotation handling for thread-safe & -unsafe lazy vals #24907

Backend

• Use IndexOutOfBoundsException constructor with Int #24764
• Emit acceptable Java generic signatures for HKTs #25540
• Unwrap refined types for Java generic signatures #25626
• Fix Java signatures for arrays of value classes #25631
• Fix Java generic signatures for context functions #25632
• Handle HKT bounds in Java generic signatures #25744
• Emit nested module classes as static inner classes #26137

Constructors

• Lambda-owned param ref in ctor incurs no field #23286

Coverage

• Fix #25624: Scoverage and separation checking failures #25625
• Scoverage: do not instrument methods that have too large bodies #25629
• Scoverage & CC interaction: exempt CC nested symbols from @experimental check #25687
• Coverage + Experimental nested match cases interaction fix #25913
• Scoverage: fix broken warnings related to tail recursion and infinite loop detection #25941
• Scoverage: correctly detect curried constructor applications #26048
• Scoverage: correctly lift wildcard and singleton types #26049
• Scoverage: refrain from lifting closures for capture calculus compatibility #26067
• Scoverage: fix lifted type computation for parameterless methods #26069
• Scoverage: Fix coverage parameterless select qualifier casts #26087

Documentation

• Sys, concurrent, runtime (1): fill in missing @param, @tparam, and @return tags in Scaladoc comments #25371
• Collection mutable (2): fill in missing @param, @tparam, and @return tags in Scaladoc comments #25372
• Collection immutable (3): fill in missing @param, @tparam, and @return tags in Scaladoc comments #25373
• Collection core (4): fill in missing @param, @tparam, and @return tags in Scaladoc comments #25374
• Numeric types (5): fill in missing @param, @tparam, and @return tags in Scaladoc comments #25375
• Array, IArray, Predef, Option (6): fill in missing @param, @tparam, and @return tags in Scaladoc comments #25376
• Math (7): fill in missing @param, @tparam, and @return tags in Scaladoc comments #25377
• Quoted, compiletime (8): fill in missing @param, @tparam, and @return tags in Scaladoc comments #25378
• Jdk (9): fill in missing @param, @tparam, and @return tags in Scaladoc comments #25379
• Util, io, ref (10): fill in missing @param, @tparam, and @return tags in Scaladoc comments #25380
• Improve sizeCompare doc #25696
• Function, Tuple, Product (12): fill in missing @param, @tparam, and @return tags in Scaladoc comments (V2) #25996
• Improve Scaladoc for Tuple#map #26060
• Fixed broken URL links. #26064
• Enable sc:compile for stdlib package scala.annotation #25836
• Enable sc:compile for stdlib package scala.beans #25837
• Enable sc:compile for stdlib package scala.collection #25838
• Enable sc:compile for stdlib package scala.collection.convert #25839
• Fix secondary constructor capture checking #25841
• Enable sc:compile for stdlib package scala.collection.generic #25845
• Enable sc:compile for stdlib package scala.collection.immutable #25855
• Enable sc:compile for stdlib package scala.collection.mutable #25860
• Enable sc:compile for stdlib package scala.collection.compat #25861
• Enable sc:compile for stdlib package scala.compiletime #25862
• Enable sc:compile for stdlib package scala.concurrent #25867
• Enable sc:compile for stdlib package scala.io #25868
• Enable sc:compile for stdlib package scala.jdk #25870
• Enable sc:compile for stdlib package scala.math #25878
• Enable sc:compile for stdlib package scala.quoted #25912
• Enable sc:compile for stdlib package scala.reflect #25915

Enums

• Adjust error on bad enum #23080
• Preserve Java enum semantics for explicit java.lang.Enum inheritance #25658

Erasure

• Preserve erased flags on synthetic context-function parameters #25751
• Fix #24653: Erase aliases of Unit as result type to void. #26192

Expression Compiler

• Fix expression evaluation in debugger under -old-syntax #26096

Extension Methods

• Fix: #24765 SAM conversion for extension method from self-based types #25637

Implicits

• Fixes #24914 Treat equivalent candidates as divergent in implicit search #25910
• Disallow implicit conversion to AnyRef again. #26210

Incremental Compilation

• Support zinc invalidation for type arguments in macro calls #23900
• Ignore annotations no longer on the classpath in ExtractAPI #25889
• Fixes #21383 enable Mode.ReadPositions when reading annotation trees #25911

Inline

• [OpenCB Project Fix] Fixes #26015: Start of NoSpan in adaptToArgs fallBack #26017

Lambda Lift

• Fixes #25943: Track super-calls as call edges in LambdaLift #26029

Linting

• Improve unused check of variable in assignment body #24685
• Warn about dollars in names of definitions unless backticked #24690
• Use precise type for x in case x @ (_: A, _: B), take 2 #26161

Opaque Types

• Fix crash on invalid opaque type in package #26118

Parser

• Fix span of xml literal #15635
• Warn if name of empty template has trailing colon #23907
• Warn dubious negative literal syntax #24163
• Fix "Compiler crashes when illegal signature of applyDynamic is used " #24974
• Check ascription in valdef pattern #25597
• Parse Java annotations on wildcard type arguments #26187

Pattern Matching

• Make sealed abstract java classes exhaustive checkable #25788

Pickling

• Fixes #25801: Handle TypeDefs in ensureHasSym #26011

Presentation Compiler

• Bugfix: Fix issue with empty name throwing exceptions #25752
• Improvement: improve perfomance of the presentation compiler #25769
• Bugfix: Don't add square braces in context bounds #25798
• Bugfix: Show hover on derives clause [#25804](#2...

3.8.4

Highlights of the release

• Allow :help syntax for all settings #26052
• feature: Add logical package parsing for sourcepath #25446
• Upgrade Scala CLI to 1.14.0
  • https://github.com/VirtusLab/scala-cli/releases/tag/v1.12.5
    • --cross support for run, package and doc sub-commands (experimental)
    • Global --offline config key
    • Local .m2 in publish local (experimental)
  • https://github.com/VirtusLab/scala-cli/releases/tag/v1.13.0
    • Support for Scala.js 1.21.0
    • Ammonite REPL deprecated & scheduled for removal
    • java-test-runner for pure Java tests
    • GraalVM native-image packaging: packaging.graalvmJvmId and packaging.graalvmArgs
  • https://github.com/VirtusLab/scala-cli/releases/tag/v1.14.0
    • Support for .test.java
    • A toggle to turn auto-IDE-setup off

Other changes and fixes

Annotations

• Also copy param annots at mixin #24916
• Named arg may be deprecatedName #21588
• Use dealiasKeepRefiningAnnots in AvoidMap #25609

Backend

• Do not simplify isInstanceOf if unrelated types might be subtypes at run-time #25535
• Port more Scala2 tests + some mixin improvements #25573
• Use Objects.equals in translating == #25314

Compiler Phases

• Harden Period creation and use of Run/PhaseId #25484
• Make Phase.run protected #25366

Context Functions

• Fix crash when processing path dependent context functions using HKTs #25530

Coverage

• Fix #25555: Preserve singleton precision during scoverage lifting #25556
• Fixes #25482: Ensure package transformation properly handles language imports in InstrumentCoverage #25546
• Scoverage: do not instrument erased values. #25298

Default parameters

• Fix named arguments evaluation order with by-name parameters #25161
• Typer: remove by-name lifting and replace default-getter args with fresh syms #25502

Documentation

• Error mentions bad _1 selector #25616
• Document Scala compiler error codes #24734
• Fix capture checking doc links in language.scala #25498
• Docs: apply snippet compiler on new types reference docs #19513
• Remove outdated comment in value classes #25428
• Update IsIterable scaladoc #24692

Enums

• Make enum apply ascriptions inferred types #25562

Extension Methods

• Accept using right associative parameters #24766
• Better handling of illegal trees in extension #25368

GADTs

• Also trust TypeTest when there is a Bind #24568

Implicits

• Deprecation when inferring implicit from non-accessible companion #25516
• Fix missing deprecation warning for implicit in non-accessible companion #25608
• Update migration message #25627

Inline

• Ensure the inline match scrutinee type conforms to the recalculated type #24988
• Do not update Symbol defTrees when retyping after Inlining #23870
• Inlines: decide sealing against original target, while using widened type as cast destination #25448
• Do not generate access proxies for locally defined protected defs #25056
• Avoid useless scrutinee proxy vals in inline match reduction #25279
• Improve the test for creating protected method accessors for inlines #25865

Linting

• Match apply in PolyFunction for override #25505
• Value discard checks inline call for exemption #25554
• Introduce error message ids for shadow warnings #25101
• Warn if for with many vals and overloaded map #25090

Match Types

• Restore MatchTypeNoCases warning with correct source position #25470

Named Tuples

• Fix Ycheck crash from singleton tuple selects after specialization #25331
• Fix #23621: make named tuples exhaustive checkable #25267

Nullability

• Patch to allow interop with XMLBuilder and -Yexplicit-nulls #25221
• Be honest about the nullability of ConsoleReporter.reader and SourcePosition.outer. #25561

Opaque Types

• Treat synthetic casts as pure #25126

Overloading

• Pretype args before skipping clause of overloaded application #23012

Parser

• Fix #20063: Java leading annotation parsing #25503
• Observe outdent also for type cases and type blocks in quotes #25519
• Fix: import resolution for Java #25537
• Fix #25456: parser crash on polymorphic context bound #25623
• Accept primitive.class in annotations #25363
• InCase has indent width of case #25295
• Don't automatically insert OUTDENT before COMMA #25501
• Add "did you mean to use parentheses/a block" when finding a complex expression on the RHS of an infix operator #25099
• Pat var must be isVarPattern #25701
• Don't pop outermost region when skipping #25738
• Context bound always has a span #25809
• Don't lookahead from interpolation #25834

Pattern Matching

• Clean desugaring of simple tuple assignments #25010
• Extend caching in the space engine beyond local context #23483
• Prevent from getting children in case of non-sealed private #25359
• Use MatchCaseUnreachable #24829
• Fix wrong exhaustive check with sequence wildcard on case class with custom unapply #24260
• Try expanding case class to the product of its fields #25454
• Fix false-positive pat mat unreachable case warning #25978

Positions

• Preserve span of this during statification of trait constructors #25354

Presentation Compiler

• Improvement: Add fallbacks in non critical places for presentation compiler #25483
• Improvement: Use method type if it's available #25641
• Bugfix: Fix wrong type in InferredType code action #25469
• Fix & feat: improvements in selection ranges #25290
• Fix: ignore implicit apply for signature help #25294
• Bugfix: remove stale top-level symbols between runs #25317
• feature: Improve the logical sources provider #26079

Quotes

• Fix crashing for context bound type variables in quoted patterns #25286
• Remove redundant mapOver in fixThisTypeModuleClassReferences #25440
• Improve LambdaTypes handling in Quotes reflect memberType #25786

Reflection

• Fix Select.copy in reflect API losing DerivedName for default getters #25269
• Do not expose ClassInfo in memberType in reflect API #24922

Reporting

• Force conditional warnings when configured #25552
• Suppressions before finalize #25576
• Use dollar-free...

3.3.8-RC2

Backported fixes

• Backport: Retry backporting #23665
  (#910)
• Backport "Do not overwrite the supertype of non-trait super in Erasure" to 3.3
  LTS (#909)
• Backport "feature: Improve the logical sources provider" to 3.3 LTS
  (#908)
• Backport "feature: Add logical package parsing for sourcepath" to 3.3 LTS
  (#907)
• Backport "Don't lookahead from interpolation" to 3.3 LTS
  (#905)
• Backport "Fix infinite loop with bad section ends in TastyHeaderUnpickler" to
  3.3 LTS (#904)
• Backport "Context bound always has a span" to 3.3 LTS
  (#903)
• Backport "Parse HTML properly in Scaladoc" to 3.3 LTS
  (#902)
• Backport "Don't pop outermost region when skipping" to 3.3 LTS
  (#901)
• Backport "Fix TastyPrinter's JAR-walking logic to include subdirectories" to
  3.3 LTS (#900)
• Backport "Ensure mistakes in CI inputs are caught early" to 3.3 LTS
  (#899)
• Backport "Delete dead code in io/Path" to 3.3 LTS
  (#898)

Contributors

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

According to git shortlog -sn --no-merges 3.3.8-RC1..3.3.8-RC2 these are:

    16  Tomasz Godzik
     2  Solal Pirelli
     2  Som Snytt

3.8.4-RC3

Backported PRs

• Bump Scala CLI to v1.14.0 (was v1.13.0) #26065
• Bump coursier to 2.1.25-M25 (was 2.1.25-M24) #26057
• Allow :help syntax for all settings #26052
• feature: Improve the logical sources provider #26079
• Add ErrorMessageID to -Winfer-union warnings (#25073) #25249
• Warn if for with many vals and overloaded map #25090
• Recognize Nullable annotations in explicit nulls #25237
• Fix false-positive pat mat unreachable case warning #25978
• Make type arguments to default methods InferredTypeTrees #25852
• Do not overwrite the supertype of non-trait super in Erasure #26081
• Move process parse exceptions to sys.error instead of a custom exception #25675
• Ensure mistakes in CI inputs are caught early #25677
• Fix TastyPrinter's JAR-walking logic to include subdirectories #25678
• Don't pop outermost region when skipping #25738
• Parse HTML properly in Scaladoc #25681
• Context bound always has a span #25809
• Fix infinite loop with bad section ends in TastyHeaderUnpickler #25676
• Don't lookahead from interpolation #25834

Contributors

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

According to git shortlog -sn --no-merges 3.8.4-RC2..3.8.4-RC3 these are:

     8	Solal Pirelli
     4	Wojciech Mazur
     3	Som Snytt
     2	Piotr Chabelski
     1	Martin Odersky
     1	Tomasz Godzik

3.3.8-RC1

Highlights of the release

• Support for JDK 26 #24430
• Multiple coverage improvement to make it on par with Scala 2 support including
  // $COVERAGE-OFF$ and // $COVERAGE-ON$ markers
• New @uncheckedOverride annotation for definitions that may override
  #24545
• Trap Ctrl-C in the REPL: if no command is running clear the prompt, if some
  command is running ask for confirmation before exiting
  #24127
• Numerous linting and presentation compiler improvements and fixes

Other changes and fixes

Access modifiers

• Check protected parent constructor accesses only occurs in child constructors
  #25511
• Fix protected constructor access
  #25523

Annotations

• Improve ref check of constructors
  #24342
• Also copy param annots at mixin
  #24916
• Named arg may be deprecatedName
  #21588
• Fix: emit deprecation warnings when a symbol is annotated by a deprecated
  annotation #23906
• Fix #20063: Java leading annotation parsing
  #25503
• Accommodate adapted Scala 2 annotation value
  #17516
• Regression test for #3403 #25521
• Fix: do not allow @targetName on primary constructor too
  #24682
• Add @uncheckedOverride annotation for definitions that may override
  #24545

Backend

• Chore: add regression test for #4528
  #24663
• Cast inline call results to result type, not method type
  #25111
• Regression tests for #25 #25536
• Enforce JVM UTF-8 string limits in the backend
  #25300
• Do not simplify isInstanceOf if unrelated types might be subtypes at run-time
  #25535
• Adjust purity of trait with lazy member
  #23788
• Use Objects.equals in translating ==
  #25314
• Fix generic signatures for mixin forwarders conflicting type parameter names
  #24567
• No mixin forwarder when ancestor is sealed
  #23482
• Simplify JVM interface list emission, remove a mini-phase
  #25203
• Chore: optimize lazy val with power of two
  #22428

Classpath

• Skip module-info.class files during REPL tab-completion
  #24838
• Fix for #22461 Empty ClassPath attribute in one or more classpath jars causes
  crash #22462

Coverage

• Make coverage more similar to the one in Scala 2
  #23722
• Fix #25555: Preserve singleton precision during scoverage lifting
  #25556
• Fixes #25482: Ensure package transformation properly handles language imports
  in InstrumentCoverage #25546
• Bugfix: Fix issues with Scala JS and coverage
  #24769
• Make coverage support incremental compilation
  #24773
• Add support for local coverage on and off with // $COVERAGE-OFF$ and
  // $COVERAGE-ON$ #24486
• Improvement: Try to optimize coverage phase
  #24925
• Scoverage: do not instrument erased values
  #25298

Default parameters

• Fix named arguments evaluation order with by-name parameters
  #25161

Documentation

• Docs: Enforce links checks in the generated docs
  #25425
• Improve the contributing guide
  #25384
• Extend copyright into 2026
  #24927
• Update README: This is Scala 3
  #25424
• Explain implicit vs default args
  #25311
• Fix some scaladoc in compiler
  #24166
• Docs: fix task name for scaladoc/testOnly
  #23678
• Replace internal tab char in comment in Synthesizer.scala
  #23691

Enums

• Fix Java enum forwarders to pull from companion on initialization
  #24361
• Make enum apply ascriptions inferred types
  #25562

Exports

• Fix: look at the underlying of a TermRef for a getter
  #24565

Extension Methods

• Accept using right associative parameters
  #24766
• Add ctor proxies before exports
  #24884
• Fix pkg obj prefix of opaque tp ext meth
  #21527
• Better handling of illegal trees in extension
  #25368
• Fix LiftToAnchors for higher-kinded type applications
  #23672
• Prevent crash when extension not found
  #18830

GADTs

• Also trust TypeTest when there is a Bind
  #24568

Implicits

• Only check seen for LazyRef for TypeSizeAccumulator
  #20459
• Chore: add regression test for #8581
  #24666
• Fix "Regression in zio/zio-schema for typer/implicit resolution"
  #24156
• Fix implicit scope liftToAnchors for parameter lower bounds
  #23679

Inference

• Tweak type for tryParameterless
  #24716

Initialization

• Refine parameter adaptation logic for arrays
  #23591

Infrastructure

• Tweak tests to not fail under jdk 25
  #25148
• Bump actions/upload-artifact from 6 to 7
  #25423
• Bump actions/download-artifact from 7 to 8
  #25420
• Bump VirtusLab/scala-cli-setup from 1.12.2 to 1.12.3
  #25422
• Bump coursier/cache-action from 7 to 8
  #25220
• Bump actions/upload-artifact from 5 to 6
  #24758
• Bump actions/download-artifact from 6 to 7
  #24759
• Bump actions/checkout from 5 to 6
  #24517
• Bump actions/upload-artifact from 4 to 5
  #24268
• Bump actions/download-artifact from 5 to 6
  #24271
• Bump actions/download-artifact from 4 to 5
  #23711
• Bump actions/checkout from 4 to 5
  #23710
• Chore: bump sbt to 1.11.5 #23805
• Chore(deps): bump actions/setup-java from 4 to 5
  #23812
• Chore: Use numberOfWorkers instead
  #24338
• Improvement: Additional way of defining ENABLE_BSP_ALL_PROJECTS
  #24122
• Formatting: Format presentation-compiler with scalafmt
  #24977

Inline

• Chore: add regression test for #22575
  #25337
• Ensure the inline match scrutinee type conforms to the recalculated type
  #24988
• Make containsOuterRefsAnywhere follow aliases
  #25214
• Find annotation args in inline expansion
  #24895
• Chore: add regression test for #10343
  #24668
• Improve the test for creating protected method accessors for inlines
  #25865
• Do not update Symbol defTrees when retyping after Inlining
  #23870
• Prevent opaque types leaking from transparent inline methods
  #23792
• Chore: add regression test for #8194
  #24655
• Also substitute symbols in case bindings symbols
  #24849
• Inlines: decide seali...

3.8.4-RC2

Backported changes

• Revert #24431 #25703
• Bump Scala CLI to v1.13.0 (was v1.12.5) #25810
• Bump jackson-* to 3.1.2 (was 2.15.1) #25785
• Reject scala.runtime's mutable refs in safe mode #25749
• Tweak SafeRefs allow list for java.util classes #25783
• Tune SafeRefs allow list for scala.util classes #25787
• Require explicit types in assumeSafe definitions in the empty package #25795
• Skip checkSafeAnnots for synthetic symbols #25773
• Reject News with unsupported Java classes #25761
• Improve LambdaTypes handling in Quotes reflect memberType #25786
• Pat var must be isVarPattern #25701
• Do not warn for package object at the top level #25826
• Fix -Ymagic-offset-header for DoubleDefinition error and implicitNotFound errors, and remove global unmanaged cache #25706
• Fix #25691: scalaXml Elem rendering in repl #25781
• Fix Ctrl+C handling in the REPL #25782
• Fix "Scala 3.8.3 compiling covariant overrides with separate compilation causes AbstractMethodError at runtime" #25659
• Fix "Fix Ctrl-C Handling in the REPL" #25835
• Improve the test for creating protected method accessors for inlines #25865
• feature: Add logical package parsing for sourcepath #25446

Contributors

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

According to git shortlog -sn --no-merges 3.8.4-RC1..3.8.4-RC2 these are:

     5	Wojciech Mazur
     4	Martin Odersky
     4	Piotr Chabelski
     3	Matt Bovel
     2	Jan Chyb
     2	Li Haoyi
     2	Solal Pirelli
     2	noti0na1
     1	Jakub Warchoł
     1	Som Snytt
     1	Tomasz Godzik
     1	Yichen Xu

3.8.4-RC1

Highlights of the release

• Bump Scala CLI to 1.12.5 and Coursier to 2.1.25-M24 #25592

Other changes and fixes

Annotations

• Also copy param annots at mixin #24916
• Named arg may be deprecatedName #21588
• Use dealiasKeepRefiningAnnots in AvoidMap #25609

Backend

• Do not simplify isInstanceOf if unrelated types might be subtypes at run-time #25535
• Port more Scala2 tests + some mixin improvements #25573
• Use Objects.equals in translating == #25314

Compiler Phases

• Harden Period creation and use of Run/PhaseId #25484
• Make Phase.run protected #25366

Context Functions

• Fix crash when processing path dependent context functions using HKTs #25530

Coverage

• Fix #25555: Preserve singleton precision during scoverage lifting #25556
• Fixes #25482: Ensure package transformation properly handles language imports in InstrumentCoverage #25546
• Scoverage: do not instrument erased values. #25298

Default parameters

• Fix named arguments evaluation order with by-name parameters #25161
• Typer: remove by-name lifting and replace default-getter args with fresh syms #25502

Documentation

• Error mentions bad _1 selector #25616
• Document Scala compiler error codes #24734
• Fix capture checking doc links in language.scala #25498
• Docs: apply snippet compiler on new types reference docs #19513
• Remove outdated comment in value classes #25428
• Update IsIterable scaladoc #24692

Enums

• Make enum apply ascriptions inferred types #25562

Experimental: Capture Checking

• Distribute capture set into and-type on RHS of comparison #25509
• Fix global capabilities support in scaladoc #25563
• Improve capture-error precision for lambdas #25583
• Make result types of hoisted superArg defs InferredTypes #25577
• Transform result any to fresh in Setup.transformSym #25584
• Propagate expected types when rechecking match return expressions #25580
• Drop assertion in toFunctionType #25628
• Delay normalization of capture sets of vals and defs #25640
• Fluidify explicit self types for non-CC classes #25639
• Add missing TypeMap in Setup: FreshCapToResult #25648
• Fixes for capture checking case class methods #25278
• Don't add capture variables for type arguments with pure upper bounds #25316
• Two fixes for #25251 #25488
• Fixed #25430: Add missing CaptureChecked flag during ExpandSAMs #25443
• Fix accessibility check for any's in static objects #25582
• Disallow type parameters in OnlyCapability annotations #25496
• Capture check Try #25072
• Make Capability types have implied capture sets for new #25346

Experimental: Safe Mode

• Enhance safe mode #25638
• Fixes to Safe Mode Checking #25603

Extension Methods

• Accept using right associative parameters #24766
• Better handling of illegal trees in extension #25368

GADTs

• Also trust TypeTest when there is a Bind #24568

Implicits

• Deprecation when inferring implicit from non-accessible companion #25516
• Fix missing deprecation warning for implicit in non-accessible companion #25608
• Update migration message #25627

Inline

• Enhance constant-folding during inlining #24431
• Ensure the inline match scrutinee type conforms to the recalculated type #24988
• Do not update Symbol defTrees when retyping after Inlining #23870
• Inlines: decide sealing against original target, while using widened type as cast destination #25448
• Do not generate access proxies for locally defined protected defs #25056
• Avoid useless scrutinee proxy vals in inline match reduction #25279

Linting

• Match apply in PolyFunction for override #25505
• Value discard checks inline call for exemption #25554
• Introduce error message ids for shadow warnings #25101

Match Types

• Restore MatchTypeNoCases warning with correct source position #25470

Named Tuples

• Fix Ycheck crash from singleton tuple selects after specialization #25331
• Fix #23621: make named tuples exhaustive checkable #25267

Nullability

• Patch to allow interop with XMLBuilder and -Yexplicit-nulls #25221
• Be honest about the nullability of ConsoleReporter.reader and SourcePosition.outer. #25561

Opaque Types

• Treat synthetic casts as pure #25126

Overloading

• Pretype args before skipping clause of overloaded application #23012

Parser

• Fix #20063: Java leading annotation parsing #25503
• Observe outdent also for type cases and type blocks in quotes #25519
• Fix: import resolution for Java #25537
• Fix #25456: parser crash on polymorphic context bound #25623
• Accept primitive.class in annotations #25363
• InCase has indent width of case #25295
• Don't automatically insert OUTDENT before COMMA #25501
• Add "did you mean to use parentheses/a block" when finding a complex expression on the RHS of an infix operator #25099

Pattern Matching

• Clean desugaring of simple tuple assignments #25010
• Extend caching in the space engine beyond local context #23483
• Prevent from getting children in case of non-sealed private #25359
• Use MatchCaseUnreachable #24829
• Fix wrong exhaustive check with sequence wildcard on case class with custom unapply #24260
• Try expanding case class to the product of its fields #25454

Positions

• Preserve span of this during statification of trait constructors #25354

Presentation Compiler

• Improvement: Add fallbacks in non critical places for presentation compiler #25483
• Improvement: Use method type if it's available #25641
• Bugfix: Fix wrong type in InferredType code action #25469
• Fix & feat: improvements in selection ranges #25290
• Fix: ignore implicit apply for signature help #25294
• Bugfix: remove stale top-level symbols between runs #25317

Quotes

• Fix crashing for context bound type variables in quoted patterns #25286
• Remove redundant mapOver in fixThisTypeModuleClassReferences [#25440](#254...

3.8.3

Release highlights

• Add support for local coverage on and off with // $COVERAGE-OFF$ and // $COVERAGE-ON$ #24486
• Deprecate for removal -print-lines compiler setting #25330
• Add safe mode capture checking extension #25307
• Port the Scala2 JVM backend optimizer #25165

Other changes and fixes

Desugaring

• Fix #24997: Avoid unnecessary CHECKCAST in untupled function parameters #25085

Documentation

• Fix little errors in the API documentation #25241
• CC Language Reference: Rename cap to any/fresh #25057

Enums

• Deprecate override class, improve checks #24828
• Fix Java enum forwarders to pull from companion on initialization #24361

Experimental: Capture Checking

• Rename caps.cap to caps.any #24923
• Track global capabilities #24883
• Treat local mutable vars as capabilities #24815
• Fix Crashes when Capture-set Parameters Conflict with Terms #25029
• Replace "cannot be included in" by "cannot flow into" in error messages #25155
• CC: Add field captures to self-type constraints #24984
• Add uses clauses for templates #24857
• Drop special code paths for objects #24881
• Do not consider generated getters to be update def #24906
• Under cc, mark inferred type arguments to inline methods with an @inferred annotation #25175
• Handle call-by-name types in bad locations under cc #25154
• Fixes for global capabilities #25123
• Warn if reach capability in result will likely cause leakage #24860
• Make <fluid> decorations replace existing capture sets #25012
• Make TypeMaps in Setup work correctly for fresh #24985
• For a limited time, also recognize caps.cap #25076
• Fix closure typing #25014
• Map class capture sets via as-seen-from with prefix of created types #24830
• Drop SafeMode attribute in Tasty #25357
• Fix @assumeSafe addition in safe mode #25364
• Disallow @assumeSafe under safe mode #25462

Experimental: Modularity

• Fix nested desugaring of applied constructor types #25288

Exports

• Add ctor proxies before exports #24884

Inline

• Make containsOuterRefsAnywhere follow aliases #25214
• Find annotation args in inline expansion #24895
• Also substitute symbols in case bindings symbols #24849

JDK

• Skip over JEP 445 compact compilation units #23247
• Handle MissingType during Erasure phase #24817

JVM Backend

• Simplify JVM interface list emission, remove a mini-phase #25203
• Don't generate bridge methods for inaccessible Java package-private methods #25166
• Revise isLocalToCompilationUnit #24856
• Enforce JVM UTF-8 string limits in the backend #25300
• Fix class super-call invokespecial owner #25437

Linting

• Extension check handles hiBound of opaque type #25172
• Distrust tree pos for patvar lint #25043
• Move second CheckUnused after pattern matcher #25114
• Unused lint ignores args to ctor of enclosing class #24768
• Check inline expansion for exclusion #23019

Metaprogramming

• Fix: Fix incremental compilation of (some unquoted) macros #24969

Named Tuples

• Don't try checking for ambiguous single-element tuples when in types #24910
• Fix "NamedTuple type in match is parsed as named pattern" #24929
• Fix "Named pattern matching doesn't work in val statements or for generators" #24928
• Fix false exhaustivity warning for pattern returning NamedTuple #23362

Overloading

• Prefer non-extension to extension #24943

Parser

• Check seen for TypeParamRef in TypeSizeAccumulator #25264
• End of new expr never shrinks #25253
• Use toVector for XML literal sequences #23221

Pattern Matching

• Emit unchecked warnings for trait patterns #24962

Presentation Compiler

• Bugfix: inline value false-positive shadowing with lambda params #25140
• Test hover on backticked identifiers with whitespace #25142
• Inlining interpolated variables #25144
• Bugfix: treat self types as parent types #25167
• Feat(pc): add closing labels inlay hints #25178
• Coursier dependency imports should have lexicographic ordering #21592
• Bugfix: Fix various minor presentation compiler issues #25256
• Fix negative activeParameter in signature help #24945
• Closes #7532: Parameter hints not working for functions #23854
• Fix opaque types displayed as Nothing & Any in hover and signature help #24921

REPL

• Skip module-info.class files during REPL tab-completion #24838
• Fix REPL usage of macros loaded via :dep and :jar #25312
• Make REPL type echo-ing use partially qualified names where made possible by imports #24850
• Force REPL to not evaluate LazyList #25444

Reporting

• Check -Werror on summarize #25096
• Fixes #24233: Remove misleading JDK compatibility hint for TASTy errors #25171
• Ignore resetting if preferPrevious #24991
• Enhance WInferUnion to not warn propagated explicit union types #25280
• Improve diagnostic message for unnecessary trailing underscore in eta-expansion #25285
• More descriptive "not found" message when type/term exists with the expected term/type name #24959
• Warn on Scala 2 auto-apply if loosely nullary #24811
• Fix printing references to nested objects #25086
• Add error note for type mismatch involving blocks without last expression #25181
• Drop -print-lines option #24905
• Don't suggest invisible members of root imports #24999

Runner

• Bump Scala CLI to v1.12.3 (was v1.12.2) #25365
• Bump Scala CLI to 1.12.4 (was 1.12.3) #25434

Rewrites

• Accommodate ArrowAssoc in infix named arg migration #25255

Scaladoc

• Init MacroClassLoader in scaladoc #25141
• Scaladoc Overload Method Link Fix #25156
• Fix duplicate member entries in Scaladoc generation #24712
• Scaladoc Tests for CC #25277
• Skip generation of API pages when building reference docs #25153
• Docs: Enfo...

3.8.3-RC3

Backported chnages

• Fix issues with Scala JS and the presentation compiler #25550
• Enforce JVM UTF-8 string limits in the backend #25300
• Fix class super-call invokespecial owner #25437
• Port the Scala2 optimizer #25165

Contributors

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

According to git shortlog -sn --no-merges 3.8.3-RC2..3.8.3-RC3 these are:

    49  Solal Pirelli
     3  Wojciech Mazur
     1  Rikito Taniguchi
     1  Tomasz Godzik