3.4.0-RC3

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

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

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

• _ type wildcards #18813
• private[this] #18819
• var x = _ #18821
• with as a type operator #18837
• xs: _* varargs #18872
• trailing _ to force eta expansion #18926

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...

3.3.2-RC1

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

• Add examples taken from reference page #18066
• Test for #18345 #18349

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

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...

3.3.1-RC7

Backported fixes

• Tweak selection from self types #18467
• Revert "Add reflect defn.FunctionClass overloads" #18473

Contributors

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

According to git shortlog -sn --no-merges 3.3.1-RC6..3.3.1-RC7 these are:

     3	Paweł Marks
     1	Martin Odersky

3.3.1-RC6

Backported fixes

• Refine infoDependsOnPrefix #18204
• FDo not compute protoFormal if param.tpt is empty #18288
• Revert "Normalize match type usage during implicit lookup" #18440

Contributors

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

According to git shortlog -sn --no-merges 3.3.1-RC5..3.3.1-RC6 these are:

     3	Paweł Marks
     2	Martin Odersky
     1	Nicolas Stucki

3.3.1-RC5

Backported fixes

• Heal stage inconsistent prefixes of type projections #18239
• Fix regression #17245: Overloaded methods with ClassTags #18286
• Disallow taking singleton types of packages again #18232
• A slightly more conservative version of #14218 #18352
• Record failures to adapt application arguments #18269
• Fix regression in exhaustivity of HK types #18303

Contributors

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

According to git shortlog -sn --no-merges 3.3.1-RC4..3.3.1-RC5 these are:

     5 Dale Wijnand
     2 Martin Odersky
     2 Paweł Marks
     1 Jan Chyb
     1 Nicolas Stucki

3.3.1-RC4

Backported fixes

• Revert "Include top-level symbols from same file in outer ambiguity error" #17438

Contributors

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

According to git shortlog -sn --no-merges 3.3.1-RC3..3.3.1-RC4 these are:

     2 Paweł Marks
     1 Nicolas Stucki

3.3.1-RC3

Backported fixes

• Add clause for protected visibility from package objects #18134

Contributors

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

According to git shortlog -sn --no-merges 3.3.1-RC2..3.3.1-RC3 these are:

     2 Paweł Marks
     1 Martin Odersky