Kotlin 2.1.20-RC3

Changelog

Compiler

• KT-75578 K2: False negative [SUPER_CALL_WITH_DEFAULT_PARAMETERS] when calling the upper-class implementation of a method with the default value argument
• KT-75965 The iOS app did not run successfully in Release mode

Native

• KT-75807 CMP caching fails for iOS with Kotlin 2.1.20-RC2

Kotlin 2.1.20-RC2

Changelog

Compiler

• KT-75649 K2: NPE on assigning platform type value to non-nullable lateinit var
• KT-75483 Native: redundant unboxing generated with smart cast
• KT-75526 Regression in K2 scripting: local name doesn't shadow one from the implicit receiver
• KT-75444 Contradictions in the constraint system are ignored in case of multiple constraints from forking points
• KT-75111 False negative "This declaration needs opt-in" for usage of enum entry with OptIn marker in another module
• KT-74764 Native: merge init nodes generated within the same LLVM module for the same klib

Compose compiler

• CMP-7571 1.8.0-alpha03 incompatible with Compose based on k1
• b/397855145 Fix "Unknown file" error in target annotation inference

JavaScript

• KT-75606 KJS: java.lang.AssertionError: Different declarations with the same signatures were detected
• KT-72437 KJS. Invalid copy method for inherited JSO with type parameters

Klibs

• KT-75393 Non-JVM artifacts from Kotlin 2.1.20-RC fail on 2.1.x releases due to IMPLICIT_ARGUMENT

Native

• KT-70202 Xcode 16 Linker fails with SIGBUS

Tools. Compiler Plugins

• KT-73897 PowerAssert: Implicit argument detection is brittle in a number of cases

Tools. Gradle

• KT-73842 Gradle: AGP failing tests with "Failed to calculate the value of property 'generalConfigurationMetrics'" using KGP
• KT-74394 KGP + isolated projects: "Something has been appended to this collector already"
• KT-75262 Gradle test-fixtures plugin apply order breaks the project
• KT-75277 FUS statistics: 'java.lang.IllegalStateException: The value for this property cannot be changed any further' exception is thrown during project import

Tools. Gradle. JS

• KT-75485 KJS: "Module not found: Error: Can't resolve 'style-loader' and 'css-loader'" in 2.1.20-RC

Kotlin 2.1.20-RC

Changelog

Compiler

• KT-74929 False positive TYPE_PARAMETER_OF_PROPERTY_NOT_USED_IN_RECEIVER if it is used with T&Any
• KT-74227 K2: "Cannot infer type for this parameter. Please specify it explicitly" caused by lambda in another lambda with a parameterized function type
• KT-74474 K2: Report more precise diagnostic when last expression of non-unit lambda is a statement
• KT-74478 K2: False negative RETURN TYPE_MISMATCH if the last statement of a lambda is indexed assignment
• KT-74203 K2: False negative NO_ELSE_IN_WHEN of a generic type with star projection <*> bounded by a sealed hierarchy

Compose compiler

• b/377499888 Allow restarting overridden functions in a final class
• b/390151896 Fix default arguments with varargs in @Composable functions
• b/388030459 Prevent usage of transitive captures in lambda memoization
• b/310004740 Check vararg parameter length in skipping logic
• b/393400768 Use -1 for .changed call if nullable enum parameter is null

Native

• KT-74377 Kotlin Native: release executable crashes with error 139

Tools. Compiler Plugins

• KT-74102 "Lambda cannot be cast to class kotlin.jvm.functions.Function0" in 2.1.20-Beta1 with Compose
• KT-75159 Compose: Missing 'FunctionKeyMeta' annotation on lamdas declared in non-composable function

Tools. Gradle

• KT-74997 Unexpected KGP warnings about kotlin scripting plugin
• KT-75026 Corrupted NonSynchronizedMetricsContainer in parallel Gradle build
• KT-74846 Gradle Configuration Cache miss on second build with 2.1.20-Beta2
• KT-74462 Flaky Kotlin Gradle Plugin Tests: IsInIdeaEnvironmentValueSource$Inject not found

Tools. Gradle. JS

• KT-74869 KJS: jsBrowserProductionWebpack does not minify output with 2.1.20-Beta2
• KT-74859 Gradle configuration cache issues related to RootPackageJsonTask

Tools. Gradle. Multiplatform

• KT-74669 Executable binaries for JVM: a jar generated by jvmJar task isn't added to the build/install/testAppName/lib directory
• KT-66542 Gradle: JVM target with withJava() produces a deprecation warning
• KT-37964 Gradle application/distribution plugin does not copy and name jar files correctly when using installDist task for multiplatform project
• KT-30878 It's impossible to have .java sources in a Multiplatform Gradle Project with Android, because android() and jvm { withJava() } targets can not be applied to one and the same Gradle Project
• KT-66962 Kapt with Kotlin Multiplatform: Cannot query the value of this provider because it has no value available
• KT-71074 Optimize Granular Metadata Dependencies Transformation for Import after adding support for Project Isolation
• KT-74727 Dependency resolve from a single target KMP module to another kmp module fails on non-found PSM
• KT-74832 Relax JVM target validation diagnostic in KMP/Jvm projects

Tools. Gradle. Native

• KT-74403 :commonizeNativeDistribution fails when configured native targets cannot be built on machine

Tools. Kapt

• KT-75202 K2 kapt: mapped type class literal is converted incorrectly

Kotlin 2.1.20-Beta2

Changelog

Analysis API

• KT-73156 AA: type retrieval for erroneous typealias crashes
• KT-68198 Analysis API: Support application service registration in plugin XMLs
• KT-69630 KAPT User project builds with KAPT4 enabled fail with Metaspace overflow

Analysis API. FIR

Performance Improvements

• KT-74012 Redundant FirAbstractBodyResolveTransformerDispatcher.<init> CPU consumption
• KT-73900 ContextCollectorVisitor#computeContext may spend significant time on createSnapshot
• KT-73665 FirElementFinder is inefficient in large files
• KT-73330 Remove bodies from functions without contracts after the CONTRACTS phase

Fixes

• KT-74097 ISE: Recursive update at org.jetbrains.kotlin.analysis.low.level.api.fir.caches.FirCaffeineCache.getValue
• KT-74098 ISE: Recursive update at org.jetbrains.kotlin.analysis.low.level.api.fir.caches.FirCaffeineCache.getValue
• KT-73079 K2: Internal compiler error when conflicting type aliases are present
• KT-73456 Expected FirResolvedContractDescription but FirRawContractDescriptionImpl found for FirSimpleFunctionImpl
• KT-73259 Expected FirResolvedContractDescription but FirLegacyRawContractDescriptionImpl found for FirSimpleFunctionImpl
• KT-72740 FirDanglingModifierList: lazyResolveToPhase(STATUS) cannot be called from a transformer with a phase STATUS
• KT-69671 TYPES phase contract violation through JavaSymbolProvider

Analysis API. Light Classes

• KT-73492 K2. FP error in Java file when using @JvmSuppressWildcards annotation without arguments

Analysis API. Providers and Caches

• KT-69247 Analysis API: Invalidate sessions after builtins modification events
• KT-72704 ISE: No 'org.jetbrains.kotlin.fir.scopes.impl.FirDelegatedMembersFilter'(53) in array owner: LLFirBuiltinsAndCloneableSession for Builtins for JS/wasm-js (JS)
• KT-67148 Analysis API: Introduce a weak reference cache for the original KtSymbol in KtSymbolPointer

Analysis API. Standalone

• KT-73776 Analysis API Standalone: Application services are missing registrations in tests and Dokka

Analysis API. Surface

New Features

• KT-73414 Analysis API: Support typealiased constructors in KaConstructorSymbol

Performance Improvements

• KT-74112 UI freeze: AnyThreadWriteThreadingSupport.getWritePermit
• KT-73942 Extend resolveToSymbols cache to all references
• KT-73622 Cache resolveToSymbols result
• KT-72684 Drop explicit resolve from KaFirJavaInteroperabilityComponent#asPsiTypeElement

Fixes

• KT-70114 K2: Analysis API: do not lazy resolve declarations without deprecation to get it deprecation
• KT-73406 [Analysis API] Allow extending KaModule resolution scope for all KaModules
• KT-65850 Cover Analysis API with KDocs
• KT-73662 KotlinIllegalArgumentExceptionWithAttachments: Expected FirResolvedTypeRef with ConeKotlinType but was FirUserTypeRefImpl
• KT-70108 Analysis API: "KaScopeProvider.scopeContext" provides scopes from implicit companion objects with inaccessible classifiers
• KT-68954 Remove JAR publications with old artifact names (high-level-api family)
• KT-70134 Analysis API: Port API documentation from the guide to KDoc
• KT-72973 Introduce KaSymbolOrigin.TYPE_ALIAS_CONSTRUCTOR

Backend. Wasm

• KT-71645 [Wasm] Check wasm test runner for groupByPackage=true case
• KT-73907 Wasm: Duplication of files in browser distribution
• KT-71868 K/Wasm: support generating debug information in DWARF format

Compiler

New Features

• KT-74049 Introduce special override rule to allow overriding T! with T & Any
• KT-61447 Support context receivers overloads in Kotlin multiplatform
• KT-73255 Change defaulting rule for annotations
• KT-73256 Implement all meta-target for annotations

Performance Improvements

• KT-73434 Slow / infinite compile involving ConeInferenceContext
• KT-73328 Do not spill this to a local variable in coroutines
• KT-69995 K2: Slow compilation when star projecting mutually recursive bounds from java
• KT-73687 Inefficient KtCommonFile#getFileAnnotationList

Fixes

• KT-70789 CLI error "mixing legacy and modern plugin arguments is prohibited" on using -Xcompiler-plugin unless default scripting plugin is disabled
• KT-74024 K2: Prohibit declaring local type aliases
• KT-73858 Compose / iOS: NullPointerException on building
• KT-73864 [Native] Decouple IrType.computePrimitiveBinaryTypeOrNull from backend.native
• KT-73122 Move the upgrade references lowering to be first one in Native pipeline
• KT-73608 K2: "Initializer type mismatch" with map and typealias to object
• KT-74104 Native: SynchronizedLazyImpl produces NPE on 2.1.20-Beta1 on mingwX64
• KT-74147 K2: False negative INCONSISTENT_TYPE_PARAMETER_VALUES
• KT-73454 K2: Fix type parameters mapping for typealiases with inner RHS
• KT-73043 K2 Compiler does not allow references to inner constructors with typealiases
• KT-74040 Compilation of inner class usage does not check the visibility of parent class during compilation in different rounds
• KT-74195 Fully qualified names in error messages make them complicated
• KT-74221 Make FirSupertypesChecker a platform checker
• KT-72962 Consider enabling ConsiderForkPointsWhenCheckingContradictions LF earlier
• KT-74242 Freeze on runCatching call in finally block inside SAM conversion
• KT-73903 Design 'replaceWith' / 'test-only' kinds for the 'LanguageFeature' class
• KT-29222 FIR: consider folding binary expression chains
• KT-73760 Cannot implement two Java interfaces with @NotNull-annotated type argument and Kotlin's plain (nullable) type parameter
• KT-58933 Applying suggested signature from WRONG_NULLABILITY_FOR_JAVA_OVERRIDE leads to red code
• KT-74107 K2: Calling type alias constructor with inner RHS in static scope causes runtime crash
• KT-74244 Context parameters: context isn't checked for expect/actual property declaration
• KT-74276 Update ASM from 9.0 to 9.6.1
• KT-72295 K2: Generated accessors for delegated property should have property source
• KT-73150 Investigate/test approximation of context parameter type in completion
• KT-73862 [Native] Decouple NativePreSerializationLoweringContext from backend.native
• KT-72677 K2 IDE / Kotlin Debugger: “Couldn't find virtual file for p1/MainKt$foo$iface$1” on evaluating inline function from another module
• KT-72672 K2 ...

Kotlin 2.1.10

Changelog

Compiler

• KT-73858 Compose / iOS: NullPointerException on building
• KT-73454 K2: Fix type parameters mapping for typealiases with inner RHS
• KT-73043 K2 Compiler does not allow references to inner constructors with typealiases
• KT-74040 Compilation of inner class usage does not check the visibility of parent class during compilation in different rounds
• KT-73339 K2: "VerifyError: Bad type on operand stack" because of missing implicit cast on generic field receiver with star projection
• KT-72585 K2: Compilation failure when upgrading to Kotlin 2.0.20+: Cannot replace top-level type with star projection: S
• KT-73399 compile-time JVM codegen failure on a KProperty argument of a KSuspendFunction parameter
• KT-72725 KMP: Unsupported actualization of inherited java field in expect class
• KT-73153 K2: Standalone diagnostics on type arguments are not reported

Compose compiler

• CMP-5680 Compose compiler: unexpected stability warnings for classes compiled with 2.0.10
• b/381407900 Avoid adding Compose annotations on synthetic classes

IR. Inlining

• KT-73981 [2.1.10] Suppress checkIncorrectCrossFileDeclarationAccess warning for Compose <class>$stable field access

JavaScript

• KT-70778 Kotlin Js companion is undefined in production build
• KT-73130 KJS: Missed break for do/while in generated JS code
• KT-58797 Optimize the code generated for objects on JS and Wasm backends

Klibs

• KT-70146 [KLIB Resolve] Don't fail on nonexistent transitive dependency
• KT-73951 Workaround for "Partial linkage engine may not patch some discrepancies in IR when compiling Kotlin/Native static caches" in 2.1.10

Native

• KT-73559 K/Native: AndroidNativeArm64 linking fails starting from Kotlin 2.1.0

Tools. CLI

• KT-73967 JDK 25: "IllegalArgumentException: 25-ea" with EA builds

Tools. Daemon

• KT-73311 "Unable to release compile session, maybe daemon is already down" flakiness

Tools. Gradle

• KT-73728 'generatePomFileForMavenPublication' creates pom with dependencies with 'unspecified' version

Tools. Gradle. Multiplatform

• KT-73620 KMP 2.1.0: Transitive dependency is broken when setting publication groupId

Tools. Gradle. Native

• KT-73572 [Gradle] kotlin.native.cacheKind=none doesn't work anymore
• KT-71419 Light bundle KGP IT run against a stable K/N version

Kotlin 2.1.10-RC2

Changelog

Compiler

• KT-73858 Compose / iOS: NullPointerException on building
• KT-74040 Compilation of inner class usage does not check the visibility of parent class during compilation in different rounds

Compose compiler

• b/381407900 Avoid adding Compose annotations on synthetic classes
• CMP-5680 Compose compiler: unexpected stability warnings for classes compiled with 2.0.10

Kotlin 2.1.10-RC

Changelog

Compiler

• KT-73454 K2: Fix type parameters mapping for typealiases with inner RHS
• KT-73043 K2 Compiler does not allow references to inner constructors with typealiases
• KT-73339 K2: "VerifyError: Bad type on operand stack" because of missing implicit cast on generic field receiver with star projection
• KT-72585 K2: Compilation failure when upgrading to Kotlin 2.0.20+: Cannot replace top-level type with star projection: S
• KT-73399 compile-time JVM codegen failure on a KProperty argument of a KSuspendFunction parameter
• KT-72725 KMP: Unsupported actualization of inherited java field in expect class
• KT-73153 K2: Standalone diagnostics on type arguments are not reported

Compose compiler

• CMP-5680 Compose compiler: unexpected stability warnings for classes compiled with 2.0.10

IR. Inlining

• KT-73981 Cherry-pick the fix for KT-73482 to 2.1.10

JavaScript

• KT-58797 Optimize the code generated for objects on JS and Wasm backends
• KT-70778 Kotlin Js companion is undefined in production build
• KT-73130 KJS: Missed break for do/while in generated JS code

Klibs

• KT-73951 Workaround for "Partial linkage engine may not patch some discrepancies in IR when compiling Kotlin/Native static caches" in 2.1.10

Native

• KT-73559 K/Native: AndroidNativeArm64 linking fails starting from Kotlin 2.1.0

Tools. CLI

• KT-73967 JDK 25: "IllegalArgumentException: 25-ea" with EA builds

Tools. Daemon

• KT-73311 "Unable to release compile session, maybe daemon is already down" flakiness

Tools. Gradle

• KT-73728 'generatePomFileForMavenPublication' creates pom with dependencies with 'unspecified' version

Tools. Gradle. Multiplatform

• KT-73620 KMP 2.1.0: Transitive dependency is broken when setting publication groupId

Tools. Gradle. Native

• KT-73572 [Gradle] kotlin.native.cacheKind=none doesn't work anymore
• KT-62826 Show a warning when KGP and K/N versions mismatch
• KT-71419 Light bundle KGP IT run against a stable K/N version

Kotlin 2.1.20-Beta1

Changelog

Analysis API

• KT-71907 K2 debugger evaluator failed when cannot resolve unrelated annotation
• KT-57733 Analysis API: Use optimized ModuleWithDependenciesScopes in combined symbol providers
• KT-69128 K2 IDE: "Unresolved reference in KDoc" reports existing Java class in reference to its own nested class
• KT-71613 KaFirPsiJavaTypeParameterSymbol cannot be cast to KaFirTypeParameterSymbol
• KT-71741 K2 IDE. Classifier was found in KtFile but was not found in FirFile in libraries/tools/kotlin-gradle-plugin-integration-tests/build.gradle.kts in kotlin.git and broken analysis
• KT-71942 Need to rethrow Intellij Platform exceptions, like ProcessCanceledException
• KT-70949 Analysis API: "containingDeclaration" does not work on nested Java classes in K2 implementation
• KT-69736 K2 IDE: False positive resolution from KDoc for value
• KT-69047 Analysis API: Unresolved KDoc reference to extensions with the same name
• KT-70815 Analysis API: Implement stop-the-world session invalidation

Analysis API. Code Compilation

• KT-71263 K2 evaluator: Error in evaluating self property with extension receiver

Analysis API. FIR

Performance Improvements

• KT-73017 Analysis API: FirReferenceResolveHelper.getSymbolsByResolvedImport searches for classes even when the selected FqName is a known package
• KT-72025 FileStructureElement: reduce redundant resolve

Fixes

• KT-72148 K2: KISEWA: Expected FirResolvedArgumentList for FirAnnotationCallImpl of FirValueParameterImpl(DataClassMember) but FirArgumentListImpl found
• KT-66132 K2: FirRegularClass expected, but FirFileImpl found | Containing declaration is not found
• KT-72196 K2. KMP. IllegalStateException: expect-actual matching is only possible for code with sources
• KT-72652 FirProvider#getContainingClass should support FirDanglingModifierSymbol
• KT-73105 Lazy resolve contract violation (BODY_RESOLVE from BODY_RESOLVE)
• KT-66261 K2: Analysis API: "FirDeclaration was not found for class org.jetbrains.kotlin.psi.KtProperty, fir is null" with MULTIPLE_LABELS_ARE_FORBIDDEN K2 error
• KT-72315 K2. KIWA on usage of always-true OR in guard condition
• KT-65707 K2 IDE: unresolved calls of callables imported with typealias as qualifier
• KT-61516 K2: Provide an LL FIR implementation for getContainingClassSymbol (in FirHelpers)
• KT-72853 Expected FirResolvedArgumentList for FirAnnotationCallImpl of FirContextReceiverImpl(Source) but FirArgumentListImpl found
• KT-64215 K2: do not resolve type annotations of receiver if it is used as an implicit return type
• KT-64248 K2: do not resolve type annotations of context receiver if it is used as an implicit return type
• KT-72821 Add assertion to diagnostic tests to check that all declarations have BODY_RESOLVE phase at the end
• KT-64056 K2: K2: FirLazyBodiesCalculator shouldn't calculate annotation arguments on type phase
• KT-71651 K2 IDE: False positive NON_LOCAL_SUSPENSION_POINT in suspend function call
• KT-72164 K2. IllegalArgumentException when pre and post increment are used simultaneously in assignment
• KT-71174 Illegal scope used
• KT-72407 FirImplementationByDelegationWithDifferentGenericSignatureChecker: FirLazyExpression should be calculated before accessing
• KT-72228 K2: Reformat doesn't work in project with Kotlin 2.0.21
• KT-72308 getOrBuildFir returns null for this expression for plusAssign operator
• KT-71348 K2: KotlinIllegalStateExceptionWithAttachments: 'By now the annotations argument mapping should have been resolved' during code inspection
• KT-72024 FirClassVarianceChecker: Expected FirResolvedTypeRef with ConeKotlinType but was FirImplicitTypeRefImplWithoutSource
• KT-71746 K2 IDE. ISE: Zero or multiple overrides found for descriptor in FirRegularClassSymbol serializing/ExternalSerializer and red code on @Serializer(forClass) ` usage

Analysis API. Infrastructure

• KT-72922 KotlinFakeClsStubsCache project leakage
• KT-71988 Improve scripts test coverage by LL FIR
• KT-64687 K2: Analysis API: migrate AbstractFirLibraryModuleDeclarationResolveTest to kotlin repo

Analysis API. Light Classes

• KT-66763 K2: Get rid of context receivers in Analysis API and LL API
• KT-71781 SLC: migrate SLC from KotlinModificationTrackerService to KotlinModificationTrackerFactory
• KT-67963 K2: PsiInvalidElementAccessException on redeclaration of class with constructor
• KT-71407 K2: Do not report @JvmField default value as PsiField initializer in K2
• KT-72078 K2 PSI change for constructor parameter with value class type

Analysis API. Providers and Caches

• KT-73395 Analysis API: JavaElementPsiSourceWithSmartPointer contains strong references to PSI
• KT-72390 Kotlin project full of red code
• KT-72388 KaFirStopWorldCacheCleaner: Control-flow exceptions
• KT-72644 "PSI has changed since creation" reason is misleading

Analysis API. Standalone

• KT-70346 Analysis API Standalone: Remove the custom class loader option in Standalone session creation

Analysis API. Stubs and Decompilation

• KT-69398 K2 IDE: SOE on editing top level private variable name
• KT-72897 Analysis API: Smart PSI element pointers for KtEnumEntry stubs cannot be restored
• KT-71565 KtClassOrObject should use isLocal from greenStub

Analysis API. Surface

New Features

• KT-70301 Analysis API: 'KaSamConstructorSymbol' does not allow to find the constructed SAM type
• KT-68236 Analysis API: add isExternal property for KtPropertySymbol
• KT-68598 Analysis API: missed getClassLikeSymbolByClassId API

Performance Improvements

• KT-60486 Analysis API: optimize KaExpressionTypeProvider.returnType for simple cases

Fixes

• KT-72099 Analysis API: implement an API to retrieve default imports
• KT-70356 analyzeCopy with IGNORE_SELF cannot find private members
• KT-66783 Analysis API: KtFirSymbolProvider creates symbols when given PSI from unrelated modules
• KT-72937 Migrate KaFirReceiverParameterSymbol to KaFirSymbol/KaFirKtBasedSymbol
• KT-70243 K2 IDE: PsiMethod.callableSymbol returns null for constructor
• KT-66608 Support OperatorFunctionChecks#isOperator in AA
• KT-73068 Analysis API: A KaFirJavaFieldSymbol for a static Java field is open instead of final
• KT-73055 Get rid of the deprecated Analysis API API
• KT-65065 Provide KtTypeReference#getShortTypeText()
• KT-63800 AA: this reference shortener doesn't simplify label
• KT-72793 Analysis API: 'expressionType' returns raw type for typealiased constructors calls
• [KT-72658...

Kotlin 2.1.0

Changelog

Analysis API

New Features

• KT-68603 KotlinDirectInheritorsProvider: add an option to ignore non-kotlin results

Performance Improvements

• KT-70757 Performance problem in KaFirVisibilityChecker for KaFirPsiJavaClassSymbol

Fixes

• KT-70437 Class reference is not resolvable
• KT-57733 Analysis API: Use optimized ModuleWithDependenciesScopes in combined symbol providers
• KT-72389 K2: False positive "Redundant 'protected' modifier" for protected property inside protected constructor from private or internal class
• KT-69190 K2: False-positive "redundant private modifier"
• KT-64984 Analysis API: Support Wasm target
• KT-70375 K2: NPE at org.jetbrains.kotlin.analysis.api.fir.symbols.KaFirNamedClassSymbolBase.createPointer
• KT-71259 K2 evaluator: Invalid smart cast info collecting for Code Fragments
• KT-69360 Lack of implicit receiver for the last statement under lambda in scripts
• KT-70890 Analysis API: Experiment with weak references to LL FIR/analysis sessions in session caches
• KT-70657 Analysis API: Inner types from classes with generics are incorrectly represented by the compiled jars
• KT-71055 Suspend calls inside 'analyze()' break the block guarantees
• KT-70815 Analysis API: Implement stop-the-world session invalidation
• KT-69819 K2 IDE: LHS type in callable references is unresolved when it has type arguments and is qualified
• KT-68761 Analysis API: Experiment with limited-size cache in KaFirSessionProvider
• KT-70384 Analysis API Standalone: The same class in the same two renamed jars is unresolved
• KT-71067 Exceptions from references cancel Find Usages
• KT-69535 Redesign 'containingSymbol'
• KT-71025 K2 IDE: Scopes in "importingScopeContext" have reversed ordering and "indexInTower" values
• KT-67483 K2 IDE: Serializable plugin causes infinite resolve recursion when there is a star import from a class with annotation call
• KT-69416 K2 IDE / Completion: “No classifier found” on simple value creating
• KT-70257 CCE: class kotlin.UInt cannot be cast to class java.lang.Number
• KT-70376 K2 IDE / Kotlin Debugger: IAE “Only componentN functions should be cached this way, but got: toString” on evaluating toString() method for value class
• KT-70264 AA: service registration via XML fails with AbstractMethodError in Lint CLI
• KT-69950 Analysis API: Introduce isSubtypeOf(ClassId)
• KT-68625 K2: “lazyResolveToPhase(STATUS) cannot be called from a transformer with a phase STATUS.”
• KT-67665 K2: contract violation for value class with a constructor parameter with an implicit type
• KT-67009 Analysis API: Add abbreviated type tests for type aliases from source modules
• KT-69977 KaFirFunctionalType#getAbbreviation is always null
• KT-68341 Analysis API: Expanded function types from libraries don't have an abbreviated type
• KT-68857 Analysis API: Refactor annotations
• KT-70386 Do not filter out overloads from different libraries in dangling files
• KT-65552 K2: CANNOT_CHECK_FOR_ERASED in KtTypeCodeFragment
• KT-65803 K2: Analysis API: KtFirTypeProvider#getSubstitutedSuperTypes throws an exception in the case of "Wrong number of type arguments"
• KT-68896 Support VirtualFile binary dependency inputs to Analysis API modules
• KT-69395 K2 IDE: incorrect overload selection from binary dependencies in a shared native source set
• KT-68573 ISE: "Unexpected constant value (kotlin/annotation/AnnotationTarget, CLASS)" at Kt1DescUtilsKt.toKtConstantValue()
• KT-69576 Analysis API: FIR implementation of "isImplicitReferenceToCompanion" returns false for companion references in implicit invoke operator calls
• KT-69568 Analysis API: FIR implementation of "isImplicitReferenceToCompanion" returns true for non-companion references in qualified calls
• KT-69436 Analysis API Platform: Encapsulate LLFirDeclarationModificationService as an engine service
• KT-63004 K2: Analysis API: Design API for querying declarations generated by compiler plugins (similar to indices)
• KT-69452 AA FIR: wrong source PSI after compile-time evaluation
• KT-69598 AA: definitely not-null type at receiver position should be wrapped in parenthesis
• KT-60484 Analysis API: add support for KtType pointers similar to KtSymbolPointer
• KT-68884 Analysis API: Rename/deprecate/remove declarations as part of Stabilization
• KT-69453 AA FIR: miss to handle expected type of lambda with explicit label
• KT-69533 Protect implementation parts of Analysis API with opt-in annotations

Analysis API. FIR

Performance Improvements

• KT-71566 FirElementBuilder#getFirForNonKtFileElement should iterate a Psi file over and over
• KT-71224 Analysis API: FirElementFinder.collectDesignationPath relies on naive iteration through FIR files

Fixes

• KT-70327 Analysis API: Batch inspection causes deadlock in ValueWithPostCompute
• KT-69070 Analysis API: Querying declared member scope for Java symbols results in exception in some use cases
• KT-68268 LLSealedInheritorsProvider: reduce scope to kotlin files
• KT-69671 TYPES phase contract violation through JavaSymbolProvider
• KT-70624 Declaration symbols from code fragments are treated as not local
• KT-70662 NPE: FirLazyBodiesCalculatorKt.calculateLazyBodyForProperty
• KT-70859 Do not fail highlighting due to resolution problems
• KT-70474 FirLazyResolveContractViolationException from JavaSymbolProvider
• KT-70323 FirLazyResolveContractViolationException: lazyResolveToPhase(TYPES) cannot be called from a transformer with a phase TYPES
• KT-71567 LLFirCompilerRequiredAnnotationsTargetResolver should calculate annotation arguments on demand
• KT-71584 getNonLocalContainingOrThisDeclaration treats KtParameter from functional type as non-local

Analysis API. Light Classes

Performance Improvements

• KT-69998 Drop redundant cache from ClassInnerStuffCache

Fixes

• KT-69833 Support value classes
• KT-71693 Wrong name mangling for JvmField class property and companion property clash
• KT-71469 KtLightClassForDecompiledDeclaration: missed kotlinOrigin
• KT-70710 Provide light classes for KMP modules in Android Lint
• KT-70548 SLC: text of class object access expression is not the same as raw text
• KT-70572 SLC: missing isInheritor implementation for type parameter
• KT-70491 SLC: inconsistent source PSI of no-arg constructor for all default values
• [KT-70458](https://youtrack.jetbrains.co...

Kotlin 2.1.0-RC2

Changelog

Compiler

• KT-72345 K2: Method 'get' without @Override annotation not called
• KT-73065 CCE with context receivers
• KT-72996 false-positive unresolved reference error on an overloaded callable reference in a lambda return position on the left-hand size of an elvis operator

Compose compiler

• CMP-6926 iOS compilation failure: Unresolved reference 'copy'

IR. Inlining

• KT-72884 Internal error in body lowering: IllegalStateException: Can't inline given reference, it should've been lowered

JavaScript

• KT-70533 KJS: changed string concatenation behavior in 2.0
• KT-14013 JS toString produces different result for nullable/non-nullable ref to the same array
• KT-43567 KJS: toString() method and string interpolation of variable produce different code
• KT-72732 KJS / ES6: "SyntaxError: 'super' keyword unexpected here" with enabled -Xir-generate-inline-anonymous-functions and disabled arrow functions

Klibs

• KT-72965 Ignore subclassOptInRequired constructor warning

Tools. Compiler Plugins

• KT-72804 Regression in Kotlin 2.1.0: compilation fails when building iOS
• KT-72824 Kotlin power-assert plugin StringIndexOutOfBoundsException

Tools. Gradle

• KT-47897 Official Kotlin Gradle plugin api
• KT-58858 Add KDoc documentation for Kotlin Gradle plugin API
• KT-73076 Kotlin Gradle Plugin API Reference: adjust settings
• KT-70543 Gradle: create migration guide for those who are using Kotlin compiler classes indirectly available in buildscripts