Kotlin 2.1.20

Changelog

Analysis API

Fixes

• KT-68198 Analysis API: Support application service registration in plugin XMLs
• KT-57733 Analysis API: Use optimized ModuleWithDependenciesScopes in combined symbol providers
• KT-73156 AA: type retrieval for erroneous typealias crashes
• KT-71907 K2 debugger evaluator failed when cannot resolve unrelated annotation
• 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
• KT-69630 KAPT User project builds with KAPT4 enabled fail with Metaspace overflow

Analysis API. Code Compilation

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

Analysis API. FIR

Performance Improvements

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

Fixes

• KT-72308 getOrBuildFir returns null for this expression for plusAssign operator
• KT-72660 ISE: Recursive update at org.jetbrains.kotlin.analysis.low.level.api.fir.caches.FirCaffeineCache.getValue
• 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-72148 K2: KISEWA: Expected FirResolvedArgumentList for FirAnnotationCallImpl of FirValueParameterImpl(DataClassMember) but FirArgumentListImpl found
• 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-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-69671 TYPES phase contract violation through JavaSymbolProvider
• 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-73492 K2. FP error in Java file when using @JvmSuppressWildcards annotation without arguments
• 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-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
• 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-73776 Analysis API Standalone: Application services are missing registrations in tests and Dokka
• 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-73414 Analysis API: Support typealiased constructors in KaConstructorSymbol
• 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-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
• KT-60486 Analysis API: optimize KaExpressionTypeProvider.returnType for simple cases

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-72099 Analysis API: implement an API to retrieve default imports
• 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
• 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 resolveToCall doesn't work for KtSafeQualifiedExpression
• KT-69930 K2 IDE: Kotlin/JS project: ISE: "Unsupported type DYNAMIC_TYPE"
• KT-71373 Make KaSessionProvider the internal API
• KT-71869 KaClassSymbol.superTypes for kotlin.Any contains kotlin.Any itself (K1-only)
• KT-64190 K2 IDE: Analysis API: KDoc link leads to a function instead of interface
• KT-72075 defaultType should be available for KaClassifierSymbol instead of KaNamedClassSymbol
• KT-72002 Analysis API: psi KaTypeParameterSymbol for default Java constructor is null

Backend. Native. Debug

• KT-73306 Native: add a way to specify a dir for the debug compilation unit file
• KT-68536 Native: bridges and trampolines affect stepping in the debugger
• KT-72398 Native: use DW_AT_trampoline for objc2kotlin_* functions instead of KonanHook in konan_lldb.py

Backend. Wasm

• KT-71868 K/Wasm: support generating debug information in DWARF format
• KT-71645 [Wasm] Check wasm test runner for groupByPackage=true case
• KT-72232 Wasm, IC: Compilation exception on renaming of file
• KT-73907 Wasm: Duplication of files in browser distribution
• KT-72223 Compiler generates an invalid glue-code for externals with backquoted identifiers
• KT-73015 [Wasm, IC] Implement possibility for readonly IC cache
• KT-71763 K/Wasm: compiler generates incorrect code for is check on JsAny
• KT-72156 custom-formatters.js exists in JAR after publishToMavenLocal but not in the published artifact in Maven public
• KT-71037 [Wasm, IC] Investigate how make kotlin.test not fully loaded in IC

Compiler

New Features

• KT-74049 Introduce special override rule to allow overriding T! with T & Any
• KT-73256 Implement all meta-target for annotations
• KT-73255 Change defaulting rule for annotations
• KT-61447 Support context receivers overloads in Kotlin multiplatform
• KT-67034 Warning when a property hides a Java field from superclass
• KT-71092 Native: Write out used dependencies
• KT-71094 Kotlin/Native incremental compilation: fail compilation if cache build failed
• KT-71569 Improve diagnostic precision for OPT_IN_ARGUMENT_IS_NOT_MARKER

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
• KT-45452 K/N optimization: inline simple functions that aren't marked with inline keyword
• KT-64898 K2: toFirProperty call in PsiRawFirBuilder forces AST loading
• KT-71673 Consider making EnhancementSymbolsCache. enhancedFunctions using simple cache
• KT-71973 KtPsiUtil#getEnclosingElementForLocalDeclaration shouldn't iterate over directories

Fixes

• KT-75965 The iOS app did not run successfully in Release mode
• KT-57696 Deprecate JvmDefault annotation with level HIDDEN
• 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-74764 Native: merge init nodes generated within the same LLVM module for the same klib
• KT-75444 Contradictions in the constraint system are ignored in case of multiple constraints from forking points
• KT-75649 K2: NPE on assigning platform type value to non-nullable lateinit var
• KT-75483 Native: redundant unboxing generated with smart cast
• KT-73028 K2. FileAnalysisException on private property in Context
• KT-73937 Context parameters: IllegalArgumentException: source must not be null on lateinit var with a context
• KT-74104 Native: SynchronizedLazyImpl produces NPE on 2.1.20-Beta1 on mingwX64
• KT-71752 K2: Absent non-null check for platform types in assignments
• KT-75526 Regression in K2 scripting: local name doesn't shadow one from the implicit receiver
• KT-68131 K2: build Grazie monorepo main branch
• KT-72618 Cannot define operator inc/dec in class context
• KT-74739 Native: "IllegalArgumentException: All constructors should've been lowered: FUNCTION_REFERENCE"
• KT-68768 K2: unsuccessful inference fork with jspecify annotations
• KT-71943 K2: IAE "source must not be null" in FirJvmModuleAccessibilityQualifiedAccessChecker
• KT-75111 False negative "This declaration needs opt-in" for usage of enum entry with OptIn marker in another module
• KT-73831 Do not choose field target in annotation classes
• KT-73494 Enable first-only-warn annotation defaulting mode
• 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-70789 CLI error "mixing legacy and modern plugin arguments is prohibited" on using -Xcompiler-plugin unless default scripting plugin is disabled
• KT-73903 Design 'replaceWith' / 'test-only' kinds for the 'LanguageFeature' class
• 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-67480 K/N: a separate inlining phase after the lowerings
• KT-72154 Dokka fails with not array: KClass<out Annotation> on Kotlin 2.1.20-dev with @SubclassOptInRequired
• KT-72040 Extra checkers: false-positive unused parameter warnings on anonymous lambda parameters
• KT-74203 K2: False negative NO_ELSE_IN_WHEN of a generic type with star projection <*> bounded by a sealed hierarchy
• KT-63720 Coroutine debugger: do not optimise out local variables
• KT-74024 K2: Prohibit declaring local type aliases
• KT-73146 Context parameters CLI & diagnostics
• KT-73251 Warn users about removal of context classes and constructors
• KT-72222 Context parameters parsing & resolution part 1
• KT-61175 K2: FirReceiverParameter does not extend FirDeclaration
• 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-73691 DCE removes static initializer function, which is actually called
• 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-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-72737 Avoid function references creation in lowerings after FunctionReferenceLowering
• 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-70507 Should parentheses prevent from plus/set operator desugaring?
• 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 IDE / Kotlin Debugger: “Couldn't find virtual file” on evaluating inline function for enum class entries from test module
• KT-73912 Cannot evaluate inline methods from another module in KMP project
• KT-73765 K2: Prohibit nested type aliases with inner RHS when it captures type parameters implicitly
• KT-73869 [Native] Move KonanSymbols out of backend.native
• KT-73823 Kotlin/Native: IndexOutOfBounds for java.util.Map::getOrDefault
• KT-73755 K2: type mismatch error contains unsubstituted type parameter types
• KT-72837 ERROR_IN_CONTRACT_DESCRIPTION message contains compiler internals
• KT-73771 K2: Infinite compilation caused by buildList without type
• KT-67520 Change of behaviour of inline function with safe cast on value type
• KT-67518 Value classes leak their carrier type implementation details via inlining
• KT-71767 Generate default compatibility bridges in -Xjvm-default=all/all-compatibility mode
• KT-73716 Context parameters expose visibility
• KT-73671 Context parameters: val/var on context parameter on a property is possible
• KT-73510 Context parameters: It is possible to declare a context for init block
• KT-72305 K2: Report error when using synthetic properties in case of mapped collections
• KT-72429 StackOverflowError when compiling large files
• KT-72500 K2 Debugger: NSME on evaluating lambda with a call to internal class field
• KT-73845 K2: IllegalArgumentException during FIR2IR transformation when processing nested default values in annotations
• KT-73538 K2 IDE / Kotlin Debugger: ISE “couldn't find inline method" on evaluating internal inline function with default arg from main module in test module
• KT-73347 K2: Expected is FirResolvedDeclarationStatus
• KT-71226 K2 Evaluator: Code fragment compilation with unresolved classes does not fail with exception
• KT-73902 Clean-up code around lateinit inline/value classes
• KT-73693 K2: DslMarker checker doesn't report violation for callable reference with bound receiver
• KT-73667 K2: DslMarker checker ignores function type annotations for invokeExtension
• KT-72797 K2 IDE / Kotlin Debugger: AE “No such value argument slot in IrCallImpl” on evaluating inc()-operator for private field
• KT-68388 Compiler crash on convesion to fun interface with extension receiver
• KT-73801 False positive CONFLICTING_OVERLOADS between base suspend fun and derived property
• KT-62833 K2: Run smoke FP tests with SLOW_ASSERTIONS enabled
• KT-54068 Context receivers with lambda nesting result in Type mismatch
• KT-51383 Lambdas with context receivers do not accept context receivers from scope
• KT-73331 Context parameters implicit invoke
• KT-73650 Implement DIFFERENT_NAMES_FOR_THE_SAME_PARAMETER_IN_SUPERTYPES for K2
• KT-73745 Migrate modularized tests to the latest stable version
• KT-70233 Implement a deprecation error for FIELD-targeted annotations on annotation properties
• 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
• KT-73791 Forbid using inline and value class modifiers together
• KT-73704 [Native] Decouple KonanIrLinker from cinterop deserialization
• KT-73641 Context parameters DSL marker support
• KT-59880 K2: Disappeared CONFLICTING_OVERLOADS
• 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-59443 K2: Implement missing K1 diagnostics
• KT-67517 Value class upcast to Any leaks carrier type interfaces
• KT-73527 Prohibit (via a deprecation warning) accessing nested class through generic outer class
• KT-72852 JAVA_CLASS_ON_COMPANION compiler warning missing in K2
• KT-71704 K2: subAtom already initialized
• KT-73399 compile-time JVM codegen failure on a KProperty argument of a KSuspendFunction parameter
• KT-72281 K/N: "Failed to wait for cache to be built"
• KT-73049 Kotlin Debugger: CNFE on evaluating local function inside lambda
• KT-72725 KMP: Unsupported actualization of inherited java field in expect class
• KT-73476 K2: Visibility of nested type aliases is not respected if RHS is inner
• KT-72957 K2: Don't use offsets for mapping annotations from IR plugins injected into metadata
• KT-72814 FIR: don't use function references in FirThisReference
• KT-73143 Context parameters resolution leftovers
• KT-71649 K2: Put operator on mutableMap<T?, V>() causes crashes on null key
• KT-72832 Erroneous implicit cast inserted by smartcast
• KT-72930 K2 IDE / Kotlin Debugger: ISE “couldn't find inline method” on evaluating internal inline function from main module in test module
• KT-73095 K2: "Failed to find functional supertype for ConeIntersectionType"
• KT-70366 K2: "KotlinIllegalArgumentExceptionWithAttachments: Failed to find functional supertype for class "
• KT-73260 Rename context receivers to context parameters in frontend
• KT-73375 K2/JVM: -Xuse-type-table generates incorrect metadata for local delegated properties
• KT-72470 Annotations on effect declarations are unresolved
• KT-72409 False negative "Type parameter is forbidden for catch parameter"
• KT-72723 K2: Replace unused FIR properties required by inheritence with computed properties
• KT-72246 Exception from FirReceiverAccessBeforeSuperCallChecker on red code
• KT-47289 No error on companion object inside inner class in enum constructor call
• KT-46120 No error reported when Java interface method is implemented by delegation to Java class where corresponding method has different generic signature
• KT-72746 K2: No IR overriddens generated for Nothing.toString
• KT-70389 K2: StackOverflowError at org.jetbrains.kotlin.fir.resolve.calls.CreateFreshTypeVariableSubstitutorStage.shouldBeFlexible
• KT-72537 [FIR Analysis] 'IllegalArgumentException: source must not be null' when typing '++++' (four pluses)
• KT-73010 K2: Refactor DispatchReceiverMemberScopeTowerLevel.processMembers
• KT-72924 Extension property declaration shouldn't be possible in when
• KT-72826 UNUSED_LAMBDA_EXPRESSION compiler warning missing in K2
• KT-25513 Report compilation error when in generated JVM bytecode there is a need for CHECKCAST to inaccessible interface
• KT-73153 K2: Standalone diagnostics on type arguments are not reported
• KT-71252 JVM: Set the proper visibility to backing fields of lateinit properties
• KT-73213 K2: Initialize outer type parameter refs for inner (local) type aliases during FIR building
• KT-73215 Set up isInner property for inner type aliases during FIR building
• KT-73088 K2: Introduce NestedTypeAliases experimental feature
• KT-73192 K2: FirJavaField has incorrect modality
• KT-60310 K2: introduce FirErrorContractDescription to distinguish unresolved contract from error one
• KT-73008 K2: Resolve nested type aliases in derived classes
• KT-73009 K2: Treat nested type aliases as classes during supertypes resolution (they are not inner by default)
• KT-59886 K2: Disappeared ERROR_IN_CONTRACT_DESCRIPTION
• KT-72839 Rewrite processConstraintStorageFromExpression using resolution atoms
• KT-73147 Context parameters FIR2IR support
• KT-72789 Fix inconsistent IR produced by ScriptsToClassesLowering for script instance feature
• KT-66711 K2: INITIALIZER_TYPE_MISMATCH is reported on the whole lambda instead of RETURN_TYPE_MISMATCH on each return expression
• KT-73011 K2: Allow overloads resolution for callable references based on expected type variable with constraints
• KT-73031 K2: Callable reference unresolved inside elvis with a complex function type
• KT-66161 K2: False-positive REDUNDANT_VISIBILITY_MODIFIER for protected modifier in private class
• KT-73065 CCE with context receivers
• KT-72345 K2: Method 'get' without @Override annotation not called
• KT-69981 K2: Refactor ResolutionMode.WithExpectedType.expectedType to be a ConeKotlinType
• KT-68363 ABSTRACT_MEMBER_NOT_IMPLEMENTED diagnostic reported only for the first not implemented function
• KT-72105 JVM: typeOf() result is sometimes incorrectly optimized to null in bytecode
• KT-72813 FIR: fix containing declaration for annotations of a receiver parameter
• KT-72552 AutoboxingTransformer fails on during linkage on nested lambdas with cinteroped types
• KT-71751 K2: Skipping code in last statement of lambda
• KT-72863 K2: failed compilation for a context receiver with an annotated type
• KT-68984 K2: Typealiased SAM constructors resolve to the expanded interface
• KT-57471 K2: Wrong diagnostics for named lambda arguments
• KT-69560 Tidy up test data that affected by PrioritizedEnumEntries or ProperUninitializedEnumEntryAccessAnalysis features
• KT-72894 "Placeholder projection cannot be mapped." error from resolve when using placeholder in a typealias
• KT-70886 FIR/AA: Reduce strong memory footprint of cached symbol names providers
• KT-72238 Argument type mismatch in builder inside extension function after ?:
• KT-72738 Simplify naming scheme for function references
• KT-72340 K1/K2 difference in de-duplication of OPT_IN_USAGE and OPT_IN_TO_INHERITANCE
• KT-61272 Frontend: error message "feature ... is experimental and should be enabled explicitly" does not explain how to do it
• KT-72664 K2: Function type kind is not propagated for parameters of incomplete calls
• KT-64247 K2: FirContextReceiver does not extend FirDeclaration
• KT-67383 Incorrect optimisation when optimising for loop with UByte
• KT-70975 K2: Confusing INVISIBLE_REFERENCE message when accessing nested class in private-in-file class
• KT-72743 CCE in FirUninitializedEnumChecker: FirPropertySymbol cannot be cast to FirEnumEntrySymbol
• KT-71708 False negative UNSUPPORTED for collection literals as trailing return value
• KT-67707 K2: CCE "ArrayMapImpl cannot be cast to class OneElementArrayMap" from FIR evaluator
• KT-71966 Seemingly bug in SupertypeComputationSession#breakLoopFor
• KT-17455 Confusing error message "There's a cycle in the inheritance hierarchy for this type" when outer class inherits nested class
• KT-71119 K2: "AssertionError: Should be primitive or nullable primitive type" caused by comparing Double/Float and Any successor type
• KT-57527 K1/K2: "IllegalArgumentException: Some properties have the same names" with inline class
• KT-57851 Wrong ValueClassRepresentation inside value class
• KT-67998 K2: CANNOT_INFER_PARAMETER_TYPE on incomplete call inside if in a Java SAM
• KT-71961 K2 debugger evaluation ClassCastException in IrElementsCreationUtilsKt#createFilesWithBuiltinsSyntheticDeclarationsIfNeeded
• KT-72504 Optimize KotlinLocalVirtualFile.isDirectory for parent virtual files
• KT-71399 Kotlin Script: NPE on type resolve
• KT-69283 Incorrect synthetic line numbers when inlining suspend funs
• KT-52929 Java cannot extend instantiations of generic Kotlin collections in the presence of instantiated Kotlin subclasses
• KT-71885 K2: confusing message when lateinit var is assigned once
• KT-69920 K2: java.lang.IllegalArgumentException: FirNamedArgumentExpressionImpl.replaceConeTypeOrNull() during Space project compilation
• KT-55894 NI: Compile errors for out-projected types are more cryptic than previously
• KT-72231 K2: NONE_APPLICABLE instead of NAMED_ARGUMENTS_NOT_ALLOWED for non-Kotlin functions with overloads
• KT-72422 KMP: False-positive report of ACTUAL_ANNOTATIONS_NOT_MATCH_EXPECT on SublcassOptInRequired
• KT-72257 'javaClass' method cannot be evaluated in Kotlin project itself
• KT-72408 Introduce new TYPE_VARIANCE_CONFLICT diagnostics
• KT-71508 JAVA_CLASS_INHERITS_KT_PRIVATE_CLASS isn't reported when java class is inherited from an effectively private class
• KT-72177 K2: Argument type mismatch when using star projection
• KT-72245 K2: When Java source roots are passed by file, fully qualified deep packages are unresolved
• KT-63923 Confusing error messages for TYPE_MISMATCH from inference
• KT-57708 Unclear TYPE_MISMATCH messages in certain situations with generics
• KT-72178 K2: "Unexpected FirPlaceholderProjectionImpl" exception when using "_" as key type in EnumMap
• KT-62455 "NullPointerException" with 'multi-field value class'
• KT-72302 K2: no error on type operator in annotation parameter default value
• KT-72212 [Scripting] Guava dependency is not packaged correctly
• KT-71662 PCLA: a type variable is not fixed on demand to a type containing a not-fixed type variable
• KT-72229 K2: Change LV of ProhibitConstructorAndSupertypeOnTypealiasWithTypeProjection to 2.2
• KT-70256 K2: Check for MISSING_BUILT_IN_DECLARATION not only for JVM but for all platforms
• KT-72173 K2: simple object names from root package are resolved without imports in non-root packages when used as values
• KT-71480 JAVA_CLASS_INHERITS_KT_PRIVATE_CLASS isn't reported while java object isn't created
• KT-60034 K2: Introduced NO_GET_METHOD
• KT-72199 K1: Match the shape of references to synthetic Java properties to the shape of their getters
• KT-15672 Improve diagnostics for accessing Enum companion object from enum constructor
• KT-71321 K2: ClassCastException caused by missed type mismatch when passing a method reference
• KT-72041 Extra checkers: false-positive unused parameter warnings on implicit lambda parameters
• KT-71959 NO_VALUE_FOR_PARAMETER should use actual lambda parameter name
• KT-69985 K2: simple classifier names from root package are resolved without imports in non-root packages
• KT-70139 Remove dependencies of debugger on K1 and old JVM backend
• KT-72142 PSI: unrelated enums are treated as equivalent
• KT-57358 False positive "Const 'val' initializer should be a constant value" caused by equality with literals
• KT-71753 PCLA: false-negative operator ambiguity error on fixing a type variable on demand for an operator assignment
• KT-70844 K2 IDE: deprecated marker shouldn't highlight not deprecated type argument
• KT-70854 K2 IDE: annotation on delegation causes illegal argument exception
• KT-56901 NI: Missing error on passing star-projection to reified type argument
• KT-70856 K2: IllegalStateException: Non-empty unresolved argument list
• KT-71897 K2: Don't erase in projections in SAM conversion if -Xsam-conversion=class like in K1
• KT-66464 Introduce isInlineable parameter for FunctionTypeKind
• KT-71590 K2: false alarm from UselessCallOnNotNullChecker
• KT-71919 Wrapped ProcessCanceledException in GenerationState#loadClassBuilderInterceptors
• KT-70922 PSI for KtPropertyAccessor is inconsistent with KtNamedFunction
• KT-28598 Type is inferred incorrectly to Any on a deep generic type with out projection
• KT-71490 K2: missing REDUNDANT_ELSE_IN_WHEN
• KT-36107 Remove deprecated mod operator convention
• KT-71166 Generic synthetic property is unresolved when parameterized with Unit
• KT-71738 K2: False negative REDECLARATION inside object expression
• KT-59908 K2: Disappeared RECURSIVE_TYPEALIAS_EXPANSION
• KT-69937 Define & enforce user-friendly terminology for extended checkers
• KT-68834 Parentheses don't influence calls of any convention operators (except invoke operator) after safe navigation operator
• KT-58437 K2: Do not use descriptors in KonanSymbols
• KT-18563 Do not generate inline reified functions as private in bytecode

Compose compiler

• b/397855145 Fix "Unknown file" error in target annotation inference
• b/377499888 Allow restarting overridden functions in a final class
• b/390151896 Fix default arguments with varargs in @Composable functions
• b/388030459 Kotlin compiler backend exception when lambda with anonymous object is memoized
• b/310004740 Check vararg parameter length in skipping logic
• b/393400768 Use -1 for .changed call if nullable enum parameter is null
• b/388505454 Change order of $changed bits with context parameters
• b/165812010 Support default values in open @Composable functions (K2 only)
• b/285336821 Use stability of parent class in stability inference
• b/353744956 Fix context receiver/parameter handling in Compose
• b/195200551 Call Enum#ordinal on enum values passed to Composer#changed
• b/378697545 Avoid using ComposableSingletons inside public inline functions
• b/376148043 Use remember function source key for intrinsic remember
• b/345204571 Remove IR offsets for conditions generated by Compose compiler
• b/376058538 Fix stack overflow when inferring stability of indirect generic loop
• b/339322843 Transform @Composable property delegate references
• CMP-7571 1.8.0-alpha03 incompatible with Compose based on k1

IDE

• KT-59445 Recursion detected on input: JavaAnnotationImpl

IR. Actualizer

• KT-68830 Compiler crash on missing actual class
• KT-71809 Kotlin-to-Java direct actualization: the property isn't actualized by overridden getter
• KT-71817 Actualization of static members is broken for non-JVM platforms

IR. Inlining

Fixes

• KT-69681 IR: Report warnings on exposure of private types in non-private inline functions
• KT-72776 [JS] Add lowerings around inlining of private functions to the common prefix at the 1st phase of compilation
• KT-72775 [JS] Add lowerings up to "cache private inline functions" to the common prefix at the 1st phase of compilation
• KT-72440 [Native] Add lowerings around inlining of private functions to the common prefix at the 1st phase of compilation
• KT-72439 [Native] Add lowerings up to "cache private inline functions" to the common prefix at the 1st phase of compilation
• KT-74039 IR proto: Rename properties of IrInlinedFunctionBlock
• KT-73987 Cherry-pick the fix for KT-73482 to 2.1.20-Beta1
• KT-73475 Fix validation errors for sharedBox... methods
• KT-73588 Support serialization/deserialization of IrReturnableBlock and IrInlinedFunctionBlock
• KT-69009 Merge -Xverify-ir-visibility-after-inlining and -Xverify-ir-visibility CLI flags
• KT-72915 Use LoweringContext instead of CommonBackendContext for the first stage of compilation
• KT-73101 Try to unbound JsIntrinsic from JsIrBackendContext
• KT-73110 Unbind JS version of Symbols from SymbolTable
• KT-73108 Unbind JS version of Symbols from context
• KT-71864 [JS] Run IrValidator as the first lowering in 1st compilation phase
• KT-73103 Switch InlineCallableReferenceToLambdaPhase to use LoweringContext
• KT-73098 Use LoweringContext for NativeInlineFunctionResolver
• KT-73096 Change LateinitLowering to use LoweringContext instead of CommonBackendContext
• KT-71141 Merge lateinit-related lowerings
• KT-73099 Use BackendContext for the JsCodeOutliningLowering
• KT-73097 Try to use BackendContext for LocalDeclarationsLowering
• KT-73035 Remove field of type SymbolTable from Symbols
• KT-72919 Move JsCommonBackendContext.coroutineSymbols into Symbols
• KT-72916 Drop symbolTable reference from BuiltinSymbolsBase
• KT-72912 Rewrite andAllOuterClasses located in FunctionInlining
• KT-72910 Move isSideEffectFree to the Symbols
• KT-72907 Extract SharedVariablesManager from BackendContext
• KT-72905 Unbind KonanSharedVariablesManager from KonanBackendContext
• KT-70961 [K/N] Test IR inliner on 1st stage with box tests
• KT-72884 Internal error in body lowering: IllegalStateException: Can't inline given reference, it should've been lowered
• KT-72920 Drop context parameter from JsCommonCoroutineSymbols
• KT-72906 Unbind JsSharedVariablesManager from JsIrBackendContext
• KT-67298 Write tests for deserialization/serialization of unbound IR
• KT-72521 Kotlin/Native: java.lang.AssertionError: kfun:androidx.compose.runtime#access$<get-androidx_compose_runtime_ProvidedValue$stable>$p$tComposerKt(){}kotlin.Int
• KT-67220 Drop caching of deserialized/lowered inline functions
• KT-72623 Don't generate synthetic accessors in files other than the one being lowered
• KT-71859 [K/N] Run IrValidator as the first lowering in 1st compilation phase
• KT-67292 Handling assertions before the IR inliner
• KT-70423 KLIB: SyntheticAccessorLowering - generate static factory functions instead of synthetic constructors
• KT-69765 Add language feature to enable IR inliner in K2 1st phase

IR. Interpreter

• KT-72356 K2 Native: IllegalStateException when annotation has the same source range as a constant in another file
• KT-71903 [K/N] Find a way to set up a synchronization point for the IR interpreter
• KT-66450 IR interpreter can't handle entries of lowered enums
• KT-71971 K2 evaluator error on casting object of value type

IR. Tree

Performance Improvements

• KT-74496 8% performance regression in lowerings
• KT-72211 Refactor IrValidator to speed up

Fixes

• KT-73553 [Native] Create testrunners for serialization tests
• KT-73224 Migrate compiler.ir.interpreter to new IR parameter API
• KT-73179 Drop IrAttributeContainer
• KT-67545 Autogenerate DeepCopyIrTreeWithSymbols
• KT-73222 Migrate compiler.ir.inline to new IR parameter API
• KT-72735 Add new IR nodes for callable references
• KT-73248 Merge FileValidator and CheckIrElementVisitor into IrValidator
• KT-73221 Migrate compiler.ir.actualization to new IR parameter API
• KT-73219 Migrate compiler.tests-compiler-utils to new IR parameter API
• KT-73194 [IR] Consider moving platform-independent funs from SymbolLookupUtils to SymbolFinder
• KT-73218 Migrate compiler.tests-common-new to new IR parameter API
• KT-73227 Migrate js:js.tests to new IR parameter API
• KT-73258 [IR] Separate new lookup functionality from IrBuiltins
• KT-73063 [JS][Wasm] Simplify ExpectDeclarationsRemoveLowering
• KT-73350 Migrate :native.tests:klib-ir-inliner to new IR parameter API
• KT-68992 Fix IR serializer to handle IR with unbound symbols
• KT-64866 Support deserializing and serializing unbound IR
• KT-72619 [IR] Steer checks for vararg types with new test directive
• KT-69498 [IR] Merge two IrTypeUtils.kt sources
• KT-72376 Disable vararg types checking in org.jetbrains.kotlin.fir.pipeline.ConvertToIrKt#runMandatoryIrValidation
• KT-69454 [IR] Check vararg types in IrValidator
• KT-68314 Remove IrBuiltins from IrModule
• KT-71944 Move IR lowering phase descriptions to kdoc
• KT-71826 stdlib fails to compile with -Xserialize-ir=all

JavaScript

Performance Improvements

• KT-16379 KotlinJs - ArrayList get is now slow
• KT-71199 K/JS: charSequenceGet intrinsic should bypass Char range checks
• KT-73759 KJS: do not fillArrayVal if using an Array init function
• KT-72180 Fix problems with memory spikes during JS Codegen/Box tests

Fixes

• KT-70987 KJS: @JsExport: NullPointerException with private data class
• KT-75606 KJS: java.lang.AssertionError: Different declarations with the same signatures were detected
• KT-58797 Optimize the code generated for objects on JS and Wasm backends
• KT-48468 KJS / IR: "StackOverflowError" when long and complex js used
• KT-72437 KJS. Invalid copy method for inherited JSO with type parameters
• KT-72974 KJS / ESModules: EagerInitialization annotation has no effect on unused properties
• KT-71788 KJS: NPE when use @JsExport with @JsPlainObject
• KT-43567 KJS: toString() method and string interpolation of variable produce different code
• KT-70778 Kotlin Js companion is undefined in production build
• KT-73130 KJS: Missed break for do/while in generated JS code
• KT-68067 KJS: Overriding methods with default parameters doesn't work
• KT-71656 K2 JS: "IllegalStateException: Class has no primary constructor: kotlin.ULong"
• KT-72598 KJS: Nested @JsPlainObject does not work
• KT-70078 @JsPlainObject compiles broken code when inlining suspend function
• KT-68904 @JsPlainObject breaks when inside a file with @file:JsQualifier
• KT-74067 KJS: ES class constructor is generated with 'return this'
• KT-72883 [JS] AbstractSuspendFunctionsLowering crashes on private top level suspend fun
• KT-70533 KJS: changed string concatenation behavior in 2.0
• KT-71949 K/JS: investigate test failures in MPP codegen tests with friend dependencies
• KT-71857 [JS] Add new step to codegen tests for IR inliner invocation
• KT-14013 JS toString produces different result for nullable/non-nullable ref to the same array
• KT-70803 Investigate generating call with invalid argument count in Js Backend
• KT-72200 Remove legacy JS test executors
• KT-68332 Remove legacy Nashorn script engine
• KT-39337 KJS: remove LabeledBlockToDoWhileTransformation and related things
• KT-72732 KJS / ES6: "SyntaxError: 'super' keyword unexpected here" with enabled -Xir-generate-inline-anonymous-functions and disabled arrow functions
• KT-71821 K/JS tests are failing with coroutines flow and turbine on timeout
• KT-70227 Remove JS from the org.jetbrains.kotlin.test.TargetBackend enum
• KT-71855 ES6ConstructorLowering sets extensionReceiver to a function without extension receiver
• KT-70226 Delete JS tests that were only run with the legacy JS backend

KMM Plugin

• KT-66458 KMM Wizards: Get rid of deprecated 'kotlinOptions'

Klibs

Fixes

• KT-70146 [KLIB Resolve] Don't fail on nonexistent transitive dependency
• KT-75393 Non-JVM artifacts from Kotlin 2.1.20-RC fail on 2.1.x releases due to IMPLICIT_ARGUMENT
• KT-74045 Context parameters: conflicting signatures for properties with/without context on the non-JVM backends
• KT-74050 Kotlin 2.1.0 with K1 throws a signature mismatch of Ir and Descriptor for Composable lambda
• KT-73589 Design & implement signatures for context parameters
• KT-73721 NativeLibraryAbiReaderWithManifestTest - move to Common BE tests
• KT-73855 [Klibs] Changing function body causes change to header klib
• KT-73474 Create NonLinkingIrInlineFunctionDeserializer directly inside inline function resolver
• KT-72627 IrInstanceInitializer is always deserialized having kotlin/Unit type
• KT-71500 Improve "incompatible ABI version" error message
• KT-72965 Ignore subclassOptInRequired constructor warning
• KT-69309 Separate pure KLIB tests from Kotlin/Native tests
• KT-71917 [JS] Make it possible to run IR lowerings before serializing to KLIBs
• KT-67474 K2: Missing @ExtensionFunctionType in metadata in KLIBs
• KT-68756 [K/N] Make it possible to run IR lowerings before serializing to KLIBs
• KT-72333 Ensure KLIBs with old local signatures (< 2.1.20) are mutually compatible with KLIBs with new local signatures (>= 2.1.20)
• KT-71633 [2.1.0] Suspicious "Argument type mismatch" error
• KT-71333 KLIB cross-compilation: Add additional tests

Libraries

New Features

• KT-72480 Move Instant and Clock from kotlinx-datetime to stdlib
• KT-31880 UUID functionality to fix Java bugs as well as extend it
• KT-54606 Print program name in Kotlin/Native executables

Performance Improvements

• KT-72492 Improve String.toFloatOrNull performance
• KT-70695 Float/Double.isFinite can be optimized

Fixes

• KT-73654 Remove org.w3c packages from stdlib documentation
• KT-62423 Consider providing Common atomic types
• KT-28492 Merge sources when building kotlin-osgi-bundle
• KT-74173 The sample code of lazy on stdlib can not run on playground due to "samples" package import
• KT-73695 PublishedApi KDoc's link to inline functions page is not rendered properly
• KT-73817 Part 1. Moving Atomics to kotlin.concurrent.atomics: bootstrap updates
• KT-73743 UninitializedPropertyAccessException on AtomicReference initialization
• KT-73820 Part 2. Moving Atomics to kotlin.concurrent.atomics: move the API to the new package
• KT-73816 Moving common Atomics to kotlin.concurrent.atomics package
• KT-73747 AtomicBoolean.asJavaAtomic() and AtomicBoolean.asKotlinAtomic() have unnecessary type parameter
• KT-74641 k.t.Clock: bypass thread state validation for std::chrono::system_clock::now()
• KT-74676 Wasm: common atomic API actualizations are annotated with wrong experimental annotation
• KT-74600 Common atomic types could be used without explicit opt-in
• KT-73291 Uuid.random() requires security context in WasmJs
• KT-69575 kotlin.uuid.Uuid is not Comparable
• KT-54859 kotlin.repeat should document behavior in the case of negative arguments
• KT-74294 Make the Uuid.parse function able to parse multiple formats
• KT-74279 Introduce Uuid.parseHexDash() and toHexDashString()
• KT-74272 Introduce Uuid.fromUByteArray and toUByteArray
• KT-74314 Reduce bitwise operations on Longs in Uuid implementation
• KT-73391 Provide samples for common atomics API
• KT-73890 Add kotlin-metadata-jvm to .zip compiler distribution
• KT-71099 Mention that selector for maxBy/minBy family is not invoked for 1-element collections
• KT-71762 ReplaceWith properties kdoc is rendered with extra spaces
• KT-73740 Unresolved reference 'AtomicBoolean' in 2.1.20-Beta1
• KT-73762 Warn about @Transient being not sound to use with non-nullable types
• KT-50395 Stdlib documentation for StringBuilder.removeRange is unclear
• KT-36863 Specify which element is returned from max/min functions if multiple elements are equal to min/max
• KT-71606 Provide Atomic and AtomicArray builtins in a bootstrap compiler
• KT-73064 Samplification of the Optional extensions documentation
• KT-69545 Kotlin/Native: Deprecate API marked with FreezingIsDeprecated to error
• KT-61184 Drop redundant @Suppress from some classes in stdlib. After stdlib migration to K2
• KT-72380 Incorrect Duration parsing with extra leading zeros in components and multiple signs
• KT-72278 Clean up redundant stdlib code for Kotlin 2.1
• KT-49026 Add Regex.replace/replaceFirst samples

Native

• KT-75807 CMP caching fails for iOS with Kotlin 2.1.20-RC2
• KT-70202 Xcode 16 Linker fails with SIGBUS
• KT-74377 Kotlin Native: release executable crashes with error 139
• KT-73559 K/Native: AndroidNativeArm64 linking fails starting from Kotlin 2.1.0
• KT-71976 [Native][KLIB Resolve]: compilation error if libraries have the same unique_name and the strategy is allow-all-with-warning or allow-first-with-warning

Native. Build Infrastructure

• KT-72063 Jars using native in their name are incompatible with JPMS
• KT-70990 Kotlin/Native: fix stdlib building task
• KT-71820 Update the coroutines version used in kotlin-native build infrastructure
• KT-71261 Kotlin/Native: enable gradle caching for runtime building tasks

Native. C and ObjC Import

• KT-74043 Drop obsolete parts of Skia (aka ad-hoc C++) import

Native. ObjC Export

• KT-72673 Native: objc2kotlin "virtual" bridges have no debug info

Native. Swift Export

• KT-73623 Swift Export: Interfaces: Add protocol printing
• KT-72703 Translate valueOf into static func
• KT-72102 Create test infra for swift export in IDE
• KT-72096 Create module for swift-export-in-ide
• KT-71898 Swift Export: support List in overrides

Test Infrastructure

• KT-67281 [Tests] Introduce an obligatory diagnostics test directive to choose a test runner
• KT-62472 Remove suppressions of warnings which are presented only in K2 but not in K1 compiler in Kotlin project
• KT-72094 K2: switch DEBUG_INFO_EXPRESSION_TYPE to regular FIR infrastructure for type rendering

Tools. CLI

• KT-73319 Migrate the main JVM CLI pipeline to the phased structure
• KT-74099 Add CLI argument to enable nested type aliases feature
• KT-69384 Add a way to force colored compiler diagnostic output
• KT-73320 Migrate the main JS CLI pipeline to the phased structure
• KT-73922 CompileEnvironmentUtil.writeToJar is unbuffered
• KT-73967 JDK 25: "IllegalArgumentException: 25-ea" with EA builds
• KT-72927 Combine FlexiblePhaseConfig and PhaseConfig
• KT-73244 :compiler:cli-base depends on :compiler:ir.serialization.jvm to read a single property
• KT-70179 K2: Building a file with kotlin-test-junit without junit does not include annotations
• KT-41756 Sanitize stack trace in 'kotlin' runner CLI script

Tools. Commonizer

• KT-74623 Drop metadata version check from KLIB commonizer

Tools. Compiler Plugin API

• KT-71212 Allow compiler plugins to write custom data to declarations metadata

Tools. Compiler Plugins

New Features

• KT-53563 Kotlin Lombok: Support @SuperBuilder
• KT-71547 Lombok Compiler Plugin Does Not Support @Builder on Constructors

Fixes

• KT-73897 PowerAssert: Implicit argument detection is brittle in a number of cases
• KT-74315 Kotlin Lombok: "Unresolved reference" on generating @Builder for static inner class where outer class is also using @Builder
• 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
• KT-58695 Lombok Builders's subclassing leads to 'Unresolved reference'
• KT-73871 PowerAssert: Comparison via operator overload results in confusing diagram
• KT-73898 PowerAssert: Operator calls with multiple receivers incorrectly aligned
• KT-73870 PowerAssert: Object should not be displayed
• KT-73895 jvm-abi-gen: $serializer class name is written incorrectly to InnerClasses attribute
• KT-73349 Migrate power-assert sources to new IR parameter API
• KT-73366 Migrate parcelize sources to new IR parameter API
• KT-72824 Kotlin power-assert plugin StringIndexOutOfBoundsException

Tools. Compiler plugins. Serialization

• KT-71072 KxSerialization: KeepGeneratedSerializer and sealed class in Map causes initialization-error
• KT-73830 [Kotlin/Wasm] CompileError: WebAssembly.Module(): Compiling function #10198:"kotlinx.serialization.$serializer.serialize" failed

Tools. Daemon

• KT-73311 "Unable to release compile session, maybe daemon is already down" flakiness
• KT-70556 Add support for SourcesChanges.ToBeCalculated
• KT-72530 The daemon has terminated unexpectedly on startup attempt #1 with error code: Unknown
• KT-72373 Fix naming for the new daemon symbols added after KT-69929

Tools. Fleet. ObjC Export

• KT-73237 ObjCExport: immutable property translated as mutable

Tools. Gradle

New Features

• KT-41409 Gradle: Support binaries.executable for jvm targets
• KT-58830 Expose AdhocComponentWithVariants API on KGP generated component
• KT-72320 Gradle Plugin Diagnostics Reporter: add emojis to increase visibility

Performance Improvements

• KT-69613 Remove usages of getCanonicalPath and getCanonicalFile in plugins code
• KT-68136 Gradle: improve classloaders cache eviction

Fixes

• 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
• KT-75026 Corrupted NonSynchronizedMetricsContainer in parallel Gradle build
• KT-74997 Unexpected KGP warnings about kotlin scripting plugin
• KT-74322 Enable source information by default in Compose compiler gradle plugin
• KT-72337 kotlin-android-extensions plugin should fail the build on apply
• KT-72967 Remove deprecated KotlinPlatformJsPlugin
• 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
• KT-74415 Make composeCompiler.includeSourceInformation true by default
• KT-73782 KGP diagnostics reporter: emojis added to KGP warning/errors are displayed broken on Windows
• KT-74095 Make ToolingDiagnosticBuilder internal API
• KT-74124 Gradle: error message regression of incompatible Gradle version usage
• KT-74639 Executable binaries for JVM test cannot be created unless an additional suffix is set in Groovy
• KT-73728 'generatePomFileForMavenPublication' creates pom with dependencies with 'unspecified' version
• KT-73974 Configuration cache when run Xcode tasks without xcode's environment
• KT-74476 KGP uses internal Gradle API, DefaultArtifactPublicationSet
• KT-62273 Use new FUS plugin in Kotlin
• KT-72963 Remove deprecated KotlinPlatformAndroidPlugin
• KT-74017 Remove kotlin.androidExtensionsPlugin.enabled flag
• KT-73749 KGP diagnostics reporter: emojis are duplicated if a gradle task is executed from the IDEA UI
• KT-72467 kotlin.sourceSets extension not added for KotlinBaseApiPlugin.createKotlinAndroidExtension()
• KT-74143 Gradle: Add workaround for gradle/gradle#31881
• KT-72384 Run Gradle Integration tests against Gradle 8.11
• KT-70150 Android Kotlin Compile Task has ClassPath Backwards
• KT-72495 Warn about kotlin-compiler-embeddable loaded along KGP
• KT-71549 K2: NoSuchMethodError: org.jetbrains.kotlin.incremental.storage.ExternalizersKt.saveToFile with dependency locking
• KT-67277 Gradle: decommission properties to disable precise task outputs backup
• KT-73795 Fix failing checkNodeJsSetup test on Windows
• KT-72383 Compatibility with Gradle 8.11 release
• KT-72394 ProjectDependency.getDependencyProject() is deprecated in Gradle 8.11
• KT-72385 Compile against Gradle API 8.11
• KT-71711 KGP: Kotlin Stdlib is leaking when KGP is applied in buildSrc
• KT-73128 Apply Kotlinlang template for partial HTMLs
• KT-58858 Add KDoc documentation for Kotlin Gradle plugin API
• KT-73076 Kotlin Gradle Plugin API Reference: adjust settings
• KT-72651 Unable to use target for KotlinBaseApiPlugin.createKotlin(Jvm/Android)Extension()
• KT-72303 KGP 2.1.0-Beta2 broke compatibility with KSP
• KT-71405 Compose compiler gradle plugin: project.layout.file can't be used as a value of the 'stabilityConfigurationFiles' option
• KT-71948 KotlinJvmFactory : get rid of replaces with TODO()
• KT-72092 Gradle: use packed klib variant as the default when no packaging attribute is present

Tools. Gradle. JS

• KT-75485 KJS: "Module not found: Error: Can't resolve 'style-loader' and 'css-loader'" in 2.1.20-RC
• KT-74869 KJS: jsBrowserProductionWebpack does not minify output with 2.1.20-Beta2
• KT-74859 Gradle configuration cache issues related to RootPackageJsonTask
• KT-72175 JS, Wasm: Deprecate non-Provider API in JS infrastructure extensions
• KT-66388 KJS / Gradle: Allow using an insecure protocol to download Node.js/Yarn when setting up project using Gradle >= 7
• KT-73614 org.jetbrains.kotlin.gradle.targets.jsAbstractSetupTask.destinationProvider should be public
• KT-72027 JS target build fails on ARM64 Windows
• KT-71362 KGP/JS: moduleName is not compatible with convention plugins
• KT-72874 KJS: NodeJsRootExtension: "'download: Boolean' is deprecated. Use download from NodeJsExtension (not NodeJsRootExtension) instead You can find this extension after applying NodeJsPlugin. This will be removed in 2.2"
• KT-72872 Js, Wasm: downloadBaseUrl in NodeJsEnvSpec could not be disabled

Tools. Gradle. Multiplatform

Performance Improvements

• KT-71888 Default Target Hierarchy results in very large heap usage/OoM when resolving IDE dependencies in larger projects

Fixes

• KT-66542 Gradle: JVM target with withJava() produces a deprecation warning
• KT-71074 Optimize Granular Metadata Dependencies Transformation for Import after adding support for Project Isolation
• KT-74669 Executable binaries for JVM: a jar generated by jvmJar task isn't added to the build/install/testAppName/lib directory
• 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-74898 The wording for the warning about incompatible 'application' plugin should be updated to suggest using the new binaries DSL
• KT-72488 Unify freeCompilerArgs property in swiftExport and compilerArgs
• KT-74727 Dependency resolve from a single target KMP module to another kmp module fails on non-found PSM
• KT-75062 Remove usage of deprecated ProjectDependency.getDependencyProject
• KT-71130 Enable Isolated Projects support by default for KMP
• KT-74832 Relax JVM target validation diagnostic in KMP/Jvm projects
• KT-57280 Expose Kotlin Project Structure metadata via consumable configurations instead of accessing all gradle projects directly
• KT-72130 Gradle Project Isolation Violation in build.gradle due to KGP
• KT-74298 Incorrect DSL for swift export settings under the export node
• KT-73620 KMP 2.1.0: Transitive dependency is broken when setting publication groupId
• KT-72112 KotlinNativeLink task fetches configuration that might not exist
• KT-49155 MPP, Gradle: Cannot use test-retry-gradle-plugin with Kotlin multiplatform tests
• KT-61816 Remove Legacy Multiplatform Gradle Plugin
• KT-72068 Distribution for klib cross-compilation is not downloaded during compile tasks
• KT-64998 Granular Metadata Dependencies Transformation is not compatible with Project Isolation
• KT-72454 Revert changes made in KT-69899 i.e. make kotlin.android.buildTypeAttribute.keep = false by default again
• KT-70380 KMM App failed to consume android binary lib
• KT-71529 Deprecate targetFromPreset API with an error

Tools. Gradle. Native

• KT-71398 kotlinNativeBundleConfiguration should not contain dependencies on unsupported platforms
• KT-74403 :commonizeNativeDistribution fails when configured native targets cannot be built on machine
• KT-62826 Show a warning when KGP and K/N versions mismatch
• KT-73572 [Gradle] kotlin.native.cacheKind=none doesn't work anymore
• KT-71722 kotlinNativeBundleConfiguration present in JVM-only Gradle project
• KT-72686 Add warning about Kotlin native home conflict declaration
• KT-71419 Light bundle KGP IT run against a stable K/N version
• KT-70558 False positive up-to-date status for CInterop tasks after changes in .h files

Tools. Gradle. Xcode

• KT-71535 embedSwiftExportForXcode doesn't report configuration error about missed dependency
• KT-72485 Swift Export DSL exposes unused options in binaries section
• KT-66894 XCFramework task fails when name passed to xcframework DSL is different from framework's name
• KT-65675 XCFrameworkTask produces an xcframework with mismatched casing in embedded frameworks

Tools. Incremental Compile

• KT-69333 Remove built-in ABI snapshot implementation
• KT-55940 Kotlin 1.8.0 compiler hangs indefinitely
• KT-29860 Incremental compilation looping or incorrect results

Tools. JPS

• KT-73688 Make it possible to build and run JPS locally
• KT-73607 JPS incremental compilation is broken after KT-71549
• KT-68565 K2: IllegalStateException: Source classes should be created separately before referencing

Tools. Kapt

• KT-75202 K2 kapt: mapped type class literal is converted incorrectly
• KT-64385 K2: Enable K2 KAPT by default
• KT-71154 Kapt tests: EXPECTED_ERROR directive is checked incorrectly
• KT-71776 K2 Kapt in 2.1.0-Beta1 fails with e: java.lang.IllegalStateException: FIR symbol "class org.jetbrains.kotlin.fir.symbols.impl.FirValueParameterSymbol" is not supported in constant evaluation

Tools. Maven

• KT-69231 PowerAssert: Create maven plugin for power-assert

Tools. Scripts

• KT-72277 Legacy REPL implementation is still based on the old backend

Tools. Wasm

• KT-72157 Turn on custom formatters feature by default in development builds
• KT-71361 [Wasm] Make all production-mode binaries optimised with binaryen