ChangeLog.md

2.3.0

Analysis API

KT-80082 K2. False positive “Cannot resolve method” for self-bounded generic with wildcard return type in Java interop
KT-80303 Move :native:analysis-api-klib-reader to :libraries:tools

Analysis API. Code Compilation

KT-70860 K2 IDE / Kotlin Debugger: CCE “java.lang.String cannot be cast to java.lang.Void” on evaluating not-null variable on the line with assigning null to that var
KT-78554 K2 IDE / Kotlin Debugger: ISE “No override for FUN IR_EXTERNAL_DECLARATION_STUB” on calling toString() for local class instance during evaluation
KT-73201 K2 IDE: Error while evaluating expressions with local classes

Analysis API. FIR

KT-81378 Expected expression ‘FirFunctionCallImpl’ to be resolved caused by suspend {}
KT-80473 Add events for tracking LL activities
KT-46375 Analysis API: Support cross-file class redeclaration checks using indices
KT-80471 Analysis API: Deduplicate equivalent call candidates in resolveToCallCandidates
KT-79653 [Analysis API] ContextCollector: BODY context of enum classes doesn't contain enum entries
KT-75858 K2 AA: False positive ‘property must be initialized’ on incremental analysis with ‘field’ usage and semicolon in setter
KT-80231 AnnotationArgumentsStateKeepers doesn't restore the initial annotation in some cases
KT-80233 Pull mutation out of AnnotationArgumentsStateKeepers
KT-71466 LLFirBuiltinsSessionFactory uses createCompositeSymbolProvider
KT-76432 JavaClassUseSiteMemberScope: Expected FirResolvedTypeRef with ConeKotlinType but was FirUserTypeRefImpl

Analysis API. Infrastructure

KT-80717 Support IntelliJ Bazel build in the Kotlin Coop development mode

Analysis API. Light Classes

KT-80656 Duplicate no-args constructor in PSI
KT-60490 Symbol Light Classes: Property accessors from a delegated interface don't present in the delegating class
KT-79689 SymbolLightClassForClassLike.toString() causes PSI tree loading
KT-80690 Private interface functions are not present in light classes
KT-80256 K2: Certain actions in JPA code causes infinite PIEAE: “Element class CompositeElement of type REFERENCE_EXPRESSION (class KtNameReferenceExpressionElementType)”
KT-79012 Add a high-level overview of light classes

Analysis API. Providers and Caches

Fixes

KT-81476 Analysis API: AlreadyDisposedException from low-memory cache cleanup
KT-80911 Analysis API: Execute session invalidation in a non-cancelable section
KT-81242 Analysis API: Add UUID/lifetime properties to LL FIR session structure logging
KT-80622 Analysis API: Visualise LL FIR session structure & weight
KT-80904 Analysis API: “Invalid dangling file module” exception during session invalidation
KT-78882 K2 AA: Calling containingSymbol on getProgressionLastElement causes exception
KT-58325 Analysis API: Combine LLKotlinStubBasedLibrarySymbolProviders in session dependencies (optimization)
KT-77825 Analysis API: CheckersComponent consumes a lot of memory while being unused in LL FIR sessions
KT-76526 Incorrect built-in module is provided for non-JVM sources in Standalone
KT-62549 Analysis API: Cache callables in combined Kotlin symbol providers
KT-70721 LL FIR: investigate possibility of moving LLFirFirClassByPsiClassProvider . getClassByPsiClass (PsiClass) to symbol providers
KT-72998 Analysis API: Introduce getClassLikeSymbolByPsi to LL FIR symbol providers

Analysis API. Standalone

KT-81108 AA: java.lang.ClassCastException: class org.jetbrains.kotlin.fir.FirBinaryDependenciesModuleData cannot be cast to class org.jetbrains.kotlin.analysis.low.level.api.fir.projectStructure.LLFirModuleData
KT-80573 Potential performance issue on class ID computation
KT-80559 Try to optimize KotlinStandaloneDeclarationProviderFactory startup for tests
KT-71706 Analysis API Standalone: StandaloneProjectFactory.createSearchScopeByLibraryRoots creates inefficient file-based search scopes

Analysis API. Stubs and Decompilation

Performance Improvements

KT-77097 Support ReplaceWith deprecation annotation argument via stubs

Fixes

KT-80350 Drop K1 decompiler
KT-77082 StackOverflowError in CreateFreshTypeVariableSubstitutorStage.shouldBeFlexible
KT-80798 Improve stubs tests coverage
KT-75318 Read context parameter fields from metadata in CallableClsStubBuilder
KT-77874 AA disagrees with the compiler on descriptions of context parameters from binaries in messages for context argument ambiguity errors
KT-80276 Implement native coping for stubs
KT-79780 Decompiled MultifileClass has Facade kind
KT-79398 isClsStubCompiledToJvmDefaultImplementation flag is inconsistent for compiled and decompiled stubs
KT-79798 Prettify stub usages in LL stub-based deserializer
KT-78949 AbstractLLStubBasedResolutionTest: tests against real stub-based files
KT-80251 Inconsistent decompiled and compiled stub for properties with an initializer and a delegate
KT-74547 Implement decompiler for K2
KT-79555 Move KotlinFileStubImpl serialization/deserialization to the Analysis API
KT-79487 “null DefinitelyNotNullType for ‘T’” from decompiler
KT-60764 Stub Builder: fix differences between K1 and K2 stub building on decompiled files
KT-79484 An empty enum class with a member decompiles with a synthetic error
KT-79730 Decompiled files have an extra Kt suffix
KT-79483 data modifier is not present on object modifier
KT-75398 Local classes from scripts have ClassId in stubs
KT-79412 Context parameters with type annotations cause inconsistency errors while building stubs

Analysis API. Surface

New Features

KT-80084 Provide endpoints for Analysis API to understand when the context sensitive resolution is used
KT-64340 Analysis API: no way to get a type of vararg parameter
KT-68387 AA: provide context for type approximations

Performance Improvements

KT-80713 Optimize KaDeclarationSymbol#visibility for class-like symbols
KT-79097 KaFirNamedFunctionSymbol#isSuspend shouldn't trigger resolution
KT-79095 isOverride shouldn't trigger resolution if not compiler plugins present

Fixes

KT-80234 Incorrect value of isActual for the implicitly actual constructor of annotation class
KT-81132 Use KaSession instead of a particular KaSessionComponent for context parameter bridges
KT-81129 K2: KaSymbolInformationProvider#importableFqName: should return null for dynamic declarations
KT-81128 K2: KaSymbolInformationProvider#importableFqName: should return null for error destructuring declarations
KT-81127 K2: KaSymbolInformationProvider#importableFqName: should return null for anonymous functions
KT-81126 K2: KaSymbolInformationProvider#importableFqName: should return null for enum entry initializer constructors
KT-81125 K2: KaSymbolInformationProvider#importableFqName: should return null for property accessors
KT-81124 K2: KaSymbolInformationProvider#importableFqName: type alias constructor should have a reference to the type alias and not to the underlying class
KT-70127 Analysis API: ‘KaFirReceiverParameterSymbol’ does not implement ‘KaFirSymbol’; leads to exception from importableFqName
KT-81123 Reimplement KaFirSymbolInformationProvider#importableFqName
KT-81122 Drop KaImportOptimizer
KT-78093 Add bridges for context parameters
KT-79772 Migrate from ‘validityAsserted’ to ‘withValidityAssertion’
KT-79328 K2 AA, isUsedAsExpression: Unhandled Non-KtExpression parent of KtExpression: class org.jetbrains.kotlin.psi.KtImportDirective
KT-80366 IllegalStateException from KaFirStopWorldCacheCleaner
KT-80274 Merge AbstractMultiModuleSymbolByPsiTest to AbstractSymbolByPsiTest
KT-80352 KaBaseResolutionScope.contains(PsiElement) always returns false for Android light classes (e.g. synthetic R.java classes)
KT-80178 Incorrect modality for an abstract interface function with a redundant open modifier
KT-79129 [Analysis API] KaFe10TypeCreator.buildClassType cannot build builtin types by class ids
KT-79143 AA: argumentMapping contains an expression that is not an argument
KT-59857 KaExpressionTypeProvider#returnType shouldn't throw an exception for class like declarations
KT-79667 Enable resolve on java record components in standalone mode
KT-73050 KaFirSymbolRelationProvider#expectsForActual: suspicius logic for KaReceiverParameterSymbol
KT-78904 KaBaseWriteActionStartedChecker throws when no additional WA was done
KT-79281 Add KDoc to KaTypePointer#restore
KT-78597 KaUseSiteVisibilityChecker returns false for internal functions exposed via implicit receiver
KT-71705 FIR api impl: Postfix increment expression's expressionType is Unit when incrementing array element
KT-75057 Analysis API: Reference to object through typealias in invoke operator call leads to original type

Backend. Native. Debug

KT-79848 Flaky debugger tests in opt.debug/cache.*/GC.CMS/GC.sch.ad/alloc.custom configuration

Backend. Wasm

New Features

KT-59032 Support instantiation of annotation classes on WASM

Fixes

KT-76204 K/Wasm: support generating a wasm module per kotlin module/klib
KT-79357 K/Wasm: store data for string literals in utf8 for Latin1
KT-82075 K/Wasm: kotlin.wasm.internal.getSimpleName crashes on iOS Safari older than 26
KT-79244 [Wasm] Drop K1-specific tests, testrunners and test directives
KT-69621 K/Wasm: Consider enabling support for KClass.qualifiedName by default
KT-80397 K/Wasm: turn on by default using a new version of the exception handling proposal for wasm-wasi target
KT-81372 K/Wasm: JsException: Exception was thrown while running JavaScript code on Safari 18.2/18.3
KT-80018 K/Wasm: exceptions don't work properly in JavaScriptCore (vm inside Safari, WebKit)
KT-66072 K/Wasm: improve how exceptions work in JS interop
KT-80106 devServer in Kotlin/Wasm overwrites defaults, causing missing static paths
KT-80210 Wasm: “Unexpected non-external class: kotlin.Nothing” caused by JsExport with JsPromise
KT-80555 WASM IC: Can't link symbol on kotlinx.coroutines on fresh master
KT-80415 WasmJs Number Elvis Operator Crash
KT-76509 WasmJS: ReferenceError: Temporal is not defined caused by “Redundant reference to unused external results”
KT-79317 [Wasm] Do not throw CCE for ExcludedFromCodegen declarations
KT-78036 K/Wasm: generate a message with “expected” and “actual” types in case of CCE

Compiler

New Features

KT-80461 K2: false positive NO_ELSE_IN_WHEN for complex sealed hierarchy
KT-77676 K/N: enable typechecks and the casts optimization pass in debug mode by default
KT-79185 Support local type aliases
KT-80837 Warn about extension function with a context shadowed by member
KT-80768 Warning on overloading by a superset of context parameters in class context
KT-80031 Check spotbugs‘s @CheckReturnValue in Kotlin’s unused return value checker
KT-79380 Native: add performance measurement for the rest of backend phases
KT-79381 Native: add performance measurement of LLVM phases
KT-80222 Implement the prohibition of always-false is checks for definitely incompatible types
KT-79295 Parse and build raw FIR from new short and full forms of positional destructuring with square brackets
KT-74810 Support typealiased/mapped Java types in unused return value checker
KT-71244 Incorporate existing @CheckReturnValue annotation(s) into Kotlin's unused return value checker
KT-79922 Record ‘MustUse/ExplicitlyIgnorable’ state for overrides even in disabled RVC mode
KT-79920 Store ‘Explicitly ignorable’ state of function/property in the metadata
KT-79690 Implement a USELESS_ELVIS_LEFT_IS_NULL with elvis expression
KT-79296 Implement/adapt diagnostics for new destructuring
KT-79298 Report errors on new destructuring syntax in K1

Performance Improvements

KT-81617 Native: casts optimizations pass explodes on deep nested loops
KT-80554 Kotlin/Native: investigate performance hit from always-on llvm pass profiling
KT-81340 K/N: severe compilation time degradation after turning on casts optimization pass
KT-80370 Add NO_INLINE attribute to some of runtime functions
KT-80167 K/N: condense the nodes and edges in DevirtualizationAnalysis constraint graph
KT-79535 Revert incorrect SAM conversion enhancements brought to K2

Fixes

KT-79979 K2: ClassCastException when overriding extension property with delegation
KT-82590 ClassCastException when instantiating class with generics implemented by fun interface and lambda
KT-78881 K2: False positive “Assigned value is never read” in composable function
KT-79276 Dexing fails with “Cannot read field X because is null” with 2.2.0
KT-79547 “UnsupportedOperationException: Not supported” with inlining and value classes
KT-79442 “Multiple annotations of type kotlin.coroutines.jvm.internal.DebugMetadata”: 2.2.0-Beta1 generates broken code with JVM default suspend methods in interfaces
KT-80744 Kotlin failure on lambda with type parameter
KT-81618 “Number of arguments should not be less than number of parameters” on JVM on Kotlin 2.3.0-Beta1
KT-82869 Green-to-Red change in 2.3 after prioritizing non-suspend-function-type overloads
KT-79611 “IllegalStateException: couldn't find inline method”: Exception during incremental compilation
KT-78895 Consider dropping isLocalInFunction and FirClassLikeDeclaration.isLocal
KT-82040 Native: ClassCastException: PointerInputChange
KT-81924 K2: “Cannot infer type for this parameter”, “Overload resolution ambiguity between candidates”
KT-80864 K2: Missing Val cannot be reassigned diagnostic for Java final fields (crashes in runtime with IllegalAccessError)
KT-71420 Report error when reified type parameter is inferred to intersection type
KT-79451 Rework approach to recursive types approximation
KT-78413 Kotlin Debugger: value classes as context parameters have incorrect names in Variables View during debugging
KT-82138 Debugger: Cannot evaluate JvmInline value class parameter
KT-82381 ArrayIndexOutOfBoundsException while FirDiagnosticsCompilerResultsReporter tries to print code as part of a warning log
KT-81068 Corrupted Unicode paths passed or used in the compiler
KT-79783 KDoc parser: Links aren't rendered if the line has an indent of 4 or more
KT-80549 Call of Java method with type parameter bounds: Expected FirResolvedTypeRef with ConeKotlinType but was FirJavaTypeRef
KT-82132 False-positive type mismatch with -language-version 2.2
KT-81988 K2: Any?.toString() causes NPE inside lambda with Java
KT-81652 Native: ClassCastException: ApplicationForegroundStateListener.Companion
KT-76479 Backend. JVM: Report errors on exposure of types in inline functions
KT-82022 K/N: Unexpected “Annotation @JvmInline is missing on actual declaration” warning with value classes
KT-80250 ISE: flow for PostponedLambdaExitNode not initialized - traversing nodes in wrong order?
KT-76344 Drop language version 1.9 for non-JVM platforms
KT-76343 Drop language version 1.8
KT-80330 K2: NPE at org.jetbrains.kotlin.fir.resolve.calls.FirCallResolver.createResolvedNamedReference
KT-80400 K2: AbstractMethodError on fun interface implementation inheriting from an interface compiled with -jvm-default=disable
KT-9111 Improve diagnostic for call with access to outer class from nested class
KT-78280 Implement the sourceless KtDiagnostics
KT-74999 K2: KotlinNothingValueException within Extension Function
KT-81254 “AssertionError: There should be at least one non-stub type to compute common supertype”: Parser issue during generic type inference
KT-53237 NI: Frontend ignores generic bound when inferring types
KT-81186 Only allow local type aliases in REPL/scripts until full stabilization
KT-80929 IC Native: Undefined symbols on ktor
KT-81657 K2: put warning about “exposing package-private in internal” under experimental language feature
KT-81241 Konanc exit while lowering org.jetbrains.kotlin.ir.util.IrUtilsKt.remapTypeParameters
KT-74819 K2: False-positive overload resolution ambiguity for flatMap inside PCLA
KT-81547 Stabilize DFA-based exhaustiveness
KT-79274 Frontend implementation of name-based destructuring
KT-79506 Contract for getter and setter doesn't work if a property is called from another module
KT-58988 K2: Deprecate exposing package-private parameter of internal method
KT-80711 IC Native: NPE during link on ktor
KT-77727 Move some of the extra checkers to the default list
KT-76136 Switch latest stable version in Kotlin project to 2.3
KT-81257 Native: “Unexpected boolean predicate” when generating ‘static_cache’
KT-81525 Report REDUNDANT_SPREAD_OPERATOR on (*) instead of argument expression
KT-81522 Fix Light Tree SPREAD_OPERATOR diagnostic positioning
KT-77008 K2: Incorrectly force casting to a wrong type
KT-78127 K2: Too precise inference for if/when with expected type in assignment
KT-80208 K2: ClassCastException: “class java.util.ArrayList cannot be cast to class java.lang.Void” type inference picks Void for generic function
KT-75797 Native: find a way to handle generates C bridges in inline functions
KT-78819 K2: False positive ABSTRACT_MEMBER_NOT_IMPLEMENTED in KJK hierarchy
KT-80003 Kotlin/Native: deprecate eager GlobalData initialization
KT-79231 Inconsistent InnerClass entry flags for abstract inner enum
KT-20677 Improve diagnostic about implicit default constructor absence for expected annotation class
KT-81385 Missing error of nullable expression in class literal in case of reified type parameter
KT-81251 Smartcast doesn't work for an effectively private inline function
KT-81245 Automatic smart cast on properties with EBF is allowed on inlined property accessors
KT-81222 Custom getter is allowed on a property with redundant EBF
KT-80795 Wrong type cast is added for IMPLICIT_COERCION_TO_UNIT
KT-81141 Fix FirUnsupportedArrayLiteralChecker to forbid array literals inside non-annotation contexts
KT-81383 Return type of anonymous function used as run argument is incorrectly inferred to Nothing
KT-80577 “Return type mismatch” for self-referential types used as generic parameters
KT-75215 KDoc: references from @param tag are rendered as plain text
KT-79887 K2 Compiler Internal Error in ‘FirFakeOverrideGenerator.checkStatusIsResolved’ Method
KT-78125 false-negative shadowed contextual overload warning on local declarations
KT-81198 Move type and type parameter annotations from jvm_metadata.proto to metadata.proto
KT-81057 Wrong handling of boxing during redundant casts optimization
KT-81191 K2: “null cannot be cast to non-null type ConeTypeParameterLookupTag” with invalid code
KT-80285 IJ monorepo: broken compilation after 2.2.20-RC update
KT-81115 Allow converting lambda with explicit parameter when assigning to variable of an extension function type
KT-74588 Redundant checkNotNull intrinsics instructions for Java generic methods
KT-78390 Unmute FusStatisticsIT.testKotlinxPlugins() after AtomicFU updates kotlin-metadata-jvm
KT-79369 Forbid typealiasing for all compiler-required annotations
KT-69294 K2: Report CONSTRUCTOR_OR_SUPERTYPE_ON_TYPEALIAS_WITH_TYPE_PROJECTION_ERROR instead of EXPANDED_TYPE_CANNOT_BE_INHERITED after switching to LV 2.2
KT-81064 Wrong safe call null check handling during redundant casts optimization
KT-80871 StackOverflowError on AnnotationTarget.TYPE
KT-80908 K2: Compiling type annotation with self-annotated vararg fail with exception
KT-81018 ISE “IR class for Foo not found” on missing dependency when lowering SAM constructor
KT-80936 NON_PUBLIC_CALL_FROM_PUBLIC_INLINE : @PublishedApi doesn't work for fun interfaces
KT-75748 StackOverflowError when reading array from metadata annotations
KT-80606 KotlinIllegalArgumentExceptionWithAttachments when using property itself in explicit backing field initialization
KT-80940 K2: Exception in FIR2IR with AnnotationTarget.TYPE with self-annotated non-vararg default argument and usage in child module
KT-80538 KaFirDiagnostic.EmptyRange doesn't work in most of the cases
KT-80524 Class is not abstract and does not implement abstract member when compiling with kotlinc-jklib
KT-80597 Apply fix for CVE-2024-7254 to our fork of protobuf 2.6.1
KT-80849 K2: ConstValueProviderImpl doesn't distinguish files with same name and package
KT-80602 Exhaustiveness checker improvements for 2.3
KT-80735 Support || return/throw shortcut in unsed return value checker
KT-79651 Report a warning about an unused return value only on the function name
KT-80719 False positive: “Redundant visibility modifier”: when overriding protected methods as “public”
KT-80434 K2: DSL marker doesn't work with lambda fields
KT-80383 Getter without a body is allowed on a property with an explicit backing field
KT-80446 Explicit visibility modifiers are allowed on EBF
KT-80378 ClassCastException on callable reference to a property with EBF
KT-80377 Fir2Ir: “Cannot determine expected receiver type” for callable reference to a property with EBF outside of class
KT-80455 K2: StackOverflowError in when exhaustiveness checker on red code
KT-72862 [Native caches] Umbrella for failing codegen/box tests for corner cases in synthetic accessors
KT-20278 NO_TYPE_ARGUMENTS_ON_RHS: Confusing diagnostic for inner class of generic outer class
KT-80418 Property with EBF with functional type isn't resolved if its type is Any
KT-80469 Functional type from property is always used for explicit backing field
KT-80535 Missing INITIALIZER_TYPE_MISMATCH for EBF
KT-80445 Private visibility is possible for a property with EBF
KT-80164 Move name generation for unnamed context parameters to frontend
KT-80684 Line breaks are lost in multi-line diagnostic messages since 2.3.0
KT-78112 RETURN_VALUE_NOT_USED is reported for local function even if it isn't marked with annotation in CHECKER mode
KT-48311 Incorrect LINENUMBER after if with a suspend call
KT-80688 Bad SourceDebugExtension caused by enhanced coroutines debugging
KT-73851 Native: compilation fails with ClassCastException with genericSafeCasts=true
KT-77593 Add a warning when @IgnorableReturnValue is inconsistent between expect/actual functions
KT-79386 Confusing error message when named parameters are used for java method calls
KT-80600 K2: Private and final modifiers are allowed on setter of open delegated property
KT-77101 Invoke on callable reference is considered ignorable
KT-79923 Remove lookup of @IgnorableReturnValue annotation from FirReturnValueOverrideChecker
KT-80517 Synthetic kotlin.Any members in data classes are missing @MustUseReturnValue
KT-80194 VAR_TYPE_MISMATCH_ON_OVERRIDE: doesn't mention the inferred type
KT-80484 K2: ClassCastException due to fake source for implicit lambda parameter (RedundantNullableChecker)
KT-80592 UninitializedPropertyAccessException when anayzing annotations on members of anonymous classes
KT-80399 Anonymous Kotlin class incorrectly warns about deprecated java override despite ‘@Deprecated’ annotation
KT-79610 Adding CocoaPod to Kotlin/Native MPP triggers IR serialization failure and commonizer errors
KT-79951 Infinite loop in parsing incomplete full form destructuring
KT-79866 kotlinc 2.2.0 silently emits ‘NonExistentClass’ instead of reporting an error
KT-79777 Argument type mismatch on value of complex type with a captured raw type argument
KT-78664 False positive VARIABLE_NEVER_READ and ASSIGNED_VALUE_IS_NEVER_READ on function type variable with splited declaration and assignment
KT-79496 False positive “when must be exhaustive” in triangle interface/class hierarchy
KT-79774 KtDestructuringDeclaration.getLPar & getRPar are broken
KT-80391 K2: Only one context parameter is mentioned in the [NO_CONTEXT_ARGUMENT] diagnostic
KT-79785 ktypew:kotlin.collections.List already exists error using Swift Export
KT-78879 “Sealed types cannot be instantiated”: Can't instantiate Java-defined sealed Class from Kotlin
KT-21598 Extension is shadowed by member should not be reported when member is deprecated with HIDDEN level
KT-79622 FUNCTION_EXPECTED: Misleading ‘expression cannot be invoked as a function’ when inaccessible with private lambda
KT-80255 [EXTENSION_FUNCTION_IN_EXTERNAL_DECLARATION] can be attached to the receiver type of a functional type
KT-79816 Java Interfaces implemented by delegation have non-null return checks
KT-80177 Improve message of RECEIVER_SHADOWED_BY_CONTEXT_PARAMETER in case of member extension
KT-79770 There is no RECEIVER_SHADOWED_BY_CONTEXT_PARAMETER if the usage of fun is from inside the class
KT-79430 False positive EXTENSION_SHADOWED_BY_MEMBER on overridden member extension
KT-62934 Incorrect line mapping inside inline lambda after non-local return
KT-79545 K2: no error on crossinline lambda usage in anonymous object base constructor call
KT-79643 HAS_NEXT_FUNCTION_AMBIGUITY and NEXT_AMBIGUITY diagnostics are always ignored in favor of HAS_NEXT_FUNCTION_NONE_APPLICABLE and NEXT_NONE_APPLICABLE
KT-79327 Modifier ‘private’ is not applicable to ‘value parameter’ is reported for context parameters
KT-76453 K2 IDE: autocomplete freeze
KT-77182 A function in a file annotated with @file:MustUseReturnValue doesn't produce a warning when it is used from compiled code
KT-78541 Jspecify: Unsound platform type despite @NullMarked for an override with a generic-subclass return type
KT-79672 ‘when expression must be exhaustive’ even after using ‘require()’
KT-71306 K2 IDE / Kotlin Debugger: “Cannot find local variable ‘block’ with type kotlin.jvm.functions.Function0” on evaluating lambda arg inside inline function
KT-76991 K2 IDE / Kotlin Debugger: ISE “Couldn't find declaration file for” on evaluating local fun when the scope has also inline fun from another file call
KT-79877 K2 IDE / Kotlin Debugger: failed evaluations of a code fragment capturing local data class
KT-77401 [FIR] ParameterNameTypeAttribute.name doesn't support @ParameterName with compile-time constant property argument
KT-79682 Fix partially uninitialized locals after coroutine spills insertion
KT-79562 NPE when passing non-lambda argument of nullable non-suspend function type into function that accepts nullable suspend function type
KT-79693 NotImplementedError: An operation is not implemented: Unknown file with KMP separate compilation
KT-79662 Unused return value checker doesn't work for com.google.errorprone.annotations.CheckReturnValue
KT-79781 Missing MISSING_DEPENDENCY_CLASS when using type alias with inaccessible RHS
KT-77772 Only report exposed type on qualifier if it's resolved to an object
KT-79765 K2. Do not report ignore return value for unresolved reference
KT-79017 False negative REDECLARATION on private nested class
KT-79519 Nested type alias is unreachable from another module
KT-72039 StackOverflowError on calling keySet on a Kotlin subclass of Java subclass of ConcurrentHashMap
KT-75843 K2: incorrect line numbers in an if-expression with a super-call
KT-77504 Add a warning when @IgnorableReturnValue is inconsistent on overrides
KT-78389 Perform version 2.3 boostrapping
KT-79092 Crash on default argument in function in fun interface
KT-77729 Package-level @NullMarked does not work when kotlinc sees .java source files
KT-79013 False negative NOT_YET_SUPPORTED_IN_INLINE on inline local functions inside inline functions
KT-79139 False positive CONFLICTING_OVERLOADS for context parameters instead of receivers
KT-35305 Address the overload conflict resolution between unsigned and non-primitive types
KT-42096 No diagnostic reported on inline modifier on an enum entry
KT-79355 Failed to fix the problem of desugared inc with new reverse implies returns contract
KT-79277 Implies returns contract doesn't affect the return type of the function if it is in the argument position
KT-79271 Implies returns contract doesn't impact exhaustiveness
KT-79218 SMARTCAST_IMPOSSIBLE for top‑level extension‑property getter despite returnsNotNull contract
KT-79220 returnsNotNull contract ignored on extension function with nullable receiver
KT-79354 IllegalStateException: Debug metadata version mismatch. Expected: 1, got 2 with compiler 2.2.20-Beta1 and stdlib 2.2.0
KT-77986 K2: False negative: “Local classes are not yet supported in inline functions”
KT-79456 Redeclaration conflict checks of private top-level classifiers rely on an incorrect containing file
KT-79125 RVC full mode: delegated interfaces are not checked
KT-63720 Coroutine debugger: do not optimise out local variables
KT-78595 type variable leak on a generic property as a call argument given an unstable smart cast
KT-79076 ‘IllegalStateException: Cannot serialize error type: ERROR CLASS: Uninferred type’ with Exposed column using recursive generic type
KT-59807 K2: Replicate the MUST_BE_LATEINIT logic from K1
KT-76782 K2: Incorrect resolve into unrelated invoke operator with wrong diagnostic
KT-78066 TYPE_PARAMETER_OF_PROPERTY_NOT_USED_IN_RECEIVER error message does not account for context parameters
KT-76065 Drop JavaTypeParameterDefaultRepresentationWithDNN feature
KT-77808 Inference: recheck the code about DNN-related hacks
KT-24202 NOTHING_TO_OVERRIDE if super-class reference misses generic arguments
KT-78909 K2: Missing diagnostics [CYCLIC_INHERITANCE_HIERARCHY] for recursive class inheritance leads to StackOverflowError
KT-75969 java.lang.IllegalArgumentException: source must not be null on red code
KT-76902 Omit type-use annotations from diagnostics
KT-17460 Diagnostics and intention on suspend function that is overriden with non-suspend one.
KT-56665 K2: false positive RECURSIVE_TYPEALIAS_EXPANSION
KT-78932 Contracts are allowed for open and overridden property accessors
KT-77203 FIR: Consider adding destructured type to all COMPONENT_FUNCTION_* diagnostics
KT-77685 “IllegalArgumentException: Sequence contains more than one matching element”
KT-78452 Drop redundant frontend structures after fir2ir conversion
KT-70507 Should parentheses prevent from plus/set operator desugaring?

Compose compiler

New features

98d3907 Introduce a compose group analysis module that produces a proguard/R8 mapping from group keys in bytecode.

Fixes

b/419049140 Disabled memoization in try blocks
KT-81081 Generate Compose-specific proguard mappings when Compose compiler plugin is applied.
b/431025881 [Compose] Clean up runtime version checker
b/365922168 Add java.util.Locale to the list of known stable classes
b/407549020 Introduce a registry of known stable markers
b/417989445 Added a diagnostic to restrict usages of runCatching in @Composable functions
KT-80294 Fix crash with inline @Composable function reference
b/430140896 Fix IrSourcePrinter output for when branch check and typechecks
CMP-9167 iOS: Platform declaration clash: The following functions have the same IR signature

IDE. Gradle Integration

KT-46273 MPP: Don't fail import for case of missed platform in source set structure
KT-46417 [UNRESOLVED_REFERENCE] For project to project dependencies of native platform test source sets
KT-44845 After update to Kotlin 1.4.30 all external dependencies is unresolved in IDE with kotlin.mpp.enableGranularSourceSetsMetadata=true
KT-46142 K/N distribution is unavailable from IDE with multiplatform hierarchical project structure enabled

IR. Actualizer

KT-77337 IrNoExpectSymbolsHandler finds expect class reference after enabling annotation traversal in IR
KT-80002 Investigate the need for map copying in IrCommonToPlatformDependencyExtractor.kt
KT-80131 KMP Separate Compilation: No override for FUN IR_EXTERNAL_DECLARATION_STUB name:
KT-80064 KMP Separate Compilation: ClassCastException: class org.jetbrains.kotlin.ir.symbols.impl.IrTypeAliasSymbolImpl cannot be cast to class org.jetbrains.kotlin.ir.symbols.IrClassSymbol
KT-80051 KMP Separate Compilation: Actualization of common dependencies failed on ‘PROPERTY FAKE_OVERRIDE name:modCount visibility:protected modality:FINAL [fake_override,var]’
KT-79998 KMP Separate Compilation: java.lang.IllegalStateException: No override for FUN IR_EXTERNAL_DECLARATION_STUB name:

IR. Inlining

New Features

KT-70360 KLIBs: Uniformly handletypeOf() calls at 1st/2nd stages of compilation

Performance Improvements

KT-69497 Crossinline lambda is allocated on K/N & JS

Fixes

KT-78673 Make fakeOverrideLocalGenericBase not using red code
KT-78537 [Inliner] Incorrect KFunction.name of a reference to inlined local function
KT-74892 Investigate passing inline lambda as argument of another inline function
KT-81673 False warnings about ABI change in dependencies in library mode in 2.3.0-Beta1
KT-81713 [Inliner] Compilation of inline function with recursive call applied to TODO() fails with an internal error
KT-80653 [IR Inliner] Space: “Local declarations should've been popped out by this point”
KT-78392 CommonPrefix: Add a way of stopping execution when one of the phases is unsuccessful
KT-80927 [Native] Review intrinsics with PublishedApi
KT-81070 [Inliner] kotlin/Any is unbound
KT-80628 KLIB inliner: Not enough information about the “full” mode
KT-69516 Double-inlining for Native: Enable visibility checks after 1st phase of inlining
KT-79334 Unify intrinsics used on 1st phase of IR inliner in KLIB-based compilers
KT-80610 KLIB inliner: Always apply cross-module inlining to pre-processed inline functions
KT-80565 KLIB Inliner: Add a special annotation to prohibit inlining of marked inline functions in stdlib on 1st compilation phase
KT-80883 [Inliner] Run pre-serialization lowerings in all testrunners
KT-77876 IrVisibilityChecker: Different set of exceptions for 1st and 2nd compilation stages
KT-80693 [IC] Split IC invalidation tests for cross-module IR Inliner
KT-79718 KLIB inliner: Emit warning on generation of public synthetic accessor when running in “explicit API mode”
KT-80226 [IR Inliner] Generate constructor accessors as constructors, not static functions
KT-80692 [IC] Split IC invalidation tests for intra-module IR Inliner
KT-77103 [Inliner] IrLocalDelegatedProperty was not serialized, while its symbol and IrRichPropertyReference were.
KT-80537 The expected error is not emitted from FirJsKlibSyntheticAccessorsTestGenerated and NativeKlibSyntheticAccessorsTestGenerated
KT-78903 Unify codegen/boxInline tests with codegen/box
KT-78989 Add missing PL tests for inline functions/property accessors
KT-79771 kotlinx-coroutines-core: Public synthetic accessor generated with enabled KLIB IR inliner
KT-79680 IrConstructorSymbolImpl is unbound in lambdaWithoutNonLocalControlflow.kt
KT-70849 Ensure correct debug info for intra-module IR inlining on the first compilation phase
KT-79800 JS BE errors with default values when IR inliner is enabled
KT-79352 Remove excessive validations from ValidateAfterAll... on the first stage
KT-76599 Migrate IrValidationAfterInliningAllFunctionsPhase to the first stage of compilation
KT-78245 Synthetic Accessors incorrectly copies default values
KT-72594 [JS][Native] Add IrInliningFacade to test runners

IR. Interpreter

KT-72356 K2 Native: IllegalStateException when annotation has the same source range as a constant in another file
KT-72881 K2: incorrect empty array as annotation argument when parameter has default value

IR. Tree

Fixes

KT-79371 Fix handling of broken SAM conversion in PL with enabled Rich References
KT-81952 “IllegalStateException: Callable reference with vararg should not appear at this stage” for callable references to functions with generic vararg parameters
KT-79739 Static synthetic accessors inside generic classes access its type parameters
KT-78100 Track and annotate internal annotations with @PublishedApi to enable annotation visibility validation
KT-80825 Drop IrSerializationSettings.reuseExistingSignaturesForSymbols setting
KT-79807 Broken IR tree invariants in IrReplSnippet after FIR2IR
KT-77819 [IR] Fine-tune IrValidator's run after Fir2IR and IR plugins
KT-70160 Remove IrDeclaration.parents after Anvil update
KT-80454 LocalDeclarationsLowering: Clean-up the dead code
KT-80819 Rework IrFileValidator to use Hashmap instead of ClassValue
KT-80516 Kotlin-like IR dump: Don't render tailrec as lateinit
KT-78856 Refactor LocalDeclarationsLowering to split it in smaller parts
KT-79439 KLIB stdlib symbols loading: Split the result of merging of IrBuiltins with BuiltinSymbolsBase hierarchy into two parts (for 1st & 2nd phases)
KT-79437 KLIB stdlib symbols loading: Drop loading functions from IrBuiltins and migrate usages to SymbolFinder functions and lazy filtering
KT-79569 Unexpected error during DFG phase in Native due to PL issue with SAM conversion represented by rich reference
KT-76601 IrValidatorConfig should have all checks disabled by default
KT-69662 Deduplicate function createTemporaryVariable
KT-79440 KLIB stdlib symbols loading: Drop BuiltinSymbolsBase from plugin API
KT-78960 [FO] Limit static fake overrides generation for static functions
KT-76813 IR validator: not all symbols/references are visited

JVM. Reflection

KT-79020 Suspend lambdas return type is shown as ??? in reflection
KT-81967 isSubtypeOf: ClassCastException: CapturedKType cannot be cast to class AbstractKType
KT-76521 Reflection: change KType representation to avoid dependency on K1
KT-81619 Reflection: Function supertype of a FunctionN class has flexible type in new implementation
KT-74529 Context parameters support in reflection
KT-80901 Reflection: incorrect translation of raw types in the new implementation
KT-74624 Reflection: KClassifier.createType(...) ignores annotations parameter
KT-80203 Reflection: provide a way to use legacy K1-based implementation
KT-80236 Reflection: KType.toString for raw types no longer renders “(raw)”
KT-79206 Reflection: suspend functional type classifier is null

JavaScript

New Features

KT-80401 Kotlin/JS support for default export in generated JavaScript
KT-79284 Use BigInt64Array for LongArray
KT-79222 K/JS: Allow using Long in exported declarations
KT-79394 Add the possibility to write common external declarations between JS and WasmJS targets

Performance Improvements

KT-57128 KJS: Use BigInt to represent Long values in ES6 mode

Fixes

KT-79928 Allow JsModule/JsNonModule/JsQualifier invocation on per-entity level
KT-79514 java.lang.IllegalStateException: IrClassSymbolImpl is unbound. Signature: kotlin.js/Promise|null[0] on running jsBrowserTest
KT-82005 KJS: “TypeError: callAgent.jsonRpcCall_ij3z26_k$ is not a function” after code change in 2.3.0-Beta1/2
KT-79359 Kotlin/JS: Suspending function doesn’t return Unit on es2015
KT-79089 KJS: Could not load reporter / Cannot find module ‘mocha’ when running jsNode tests
KT-56281 KJS: Can't export suspend functions
KT-79926 Wrong export of interfaces with companions with ES Modules
KT-80168 Allow @JsStatic inside interface companions
KT-70222 Remove legacy JS BE-related CLI flags
KT-81424 Kotlin/JS: Cannot Get / in a simple running application
KT-80873 KJS: Stdlib requires ES2020-compatible JS engine due to BigInt type literal
KT-81066 Wasm, JS: Remove redundant logging in compiler output
KT-72833 KJS: Source maps have incorrect sources paths in per-file
KT-74055 KJS: @JsPlainObject adds JS code even if marked interface is not used
KT-72474 KJS: @JsPlainObject doesn't honour -XXLanguage:+JsAllowInvalidCharsIdentifiersEscaping
KT-79644 BigInt enabled for ES 2015 despite being an ES 2020 feature
KT-52771 KJS: Pair should be exported to JavaScript
KT-79704 Unify variance rendering between JS and other backends
KT-69297 Deprecate referencing inlineable lambdas in js() calls
KT-80086 [k/js] Resolving imported string literals
KT-79066 [Kotlin/JS] jsNodeTest fails with SyntaxError when a test file has @file:JsExport and useEsModules() is enabled
KT-77385 Investigate partial linkage problems for JS HMPP tests
KT-79628 Remove IR nodes from ExportModel
KT-79916 K/JS: “Uncaught TypeError” when using ‘Xes-long-as-bigint’ in compose-html
KT-79050 KJS / IC: “Unexpected body of primary constructor for processing irClass”
KT-79977 KJS: Long.rotateLeft returns incorrect result when BigInts are enabled
KT-78831 AbstractFunctionReferencesLowering: fragile fake override generation
KT-52230 KSJ IR: Applying identity equality operator to Longs always returns false
KT-6675 KotlinJS: toInt() on external Long throws error
KT-79184 K/JS: Further intrinsify BigInt-backed Long operations

Klibs

New Features

KT-80761 K2: [K/N] Should reported klib usage include inheritance

Performance Improvements

KT-80861 [Klib] Deduplicate IrFileEntry.name
KT-80866 [Klib] Optimize size of IrFileEntry.line_start_offset
KT-80438 Uncached KlibMetadataClassDataFinder.findClassData

Fixes

KT-64237 Klib metadata: migrate to using the common annotations instead of klib-specific extensions in the compiler
KT-80099 KLIB resolver: Could not find file because of missing klib extension in resolved symlink path
KT-80999 Reuse existing IrKotlinLibraryLayout in KotlinLibrary for reading pre-processed functions
KT-80290 Remove if and TODO in countInAsInlinedLambdaArgumentWithPermittedNonLocalReturns
KT-80298 K/N: one-stage compilation is broken
KT-79958 KLIB tool fails to render IR if there is IrErrorType in a lirbrary
KT-75241 Move ExperimentalLibraryAbiReader to a publishable artifact
KT-76260 Make IrRichCallableReferencesInKlibs lang feature stable in LV=2.3
KT-61552 [PL] IndexOutOfBoundsException in SAM conversion with substituted function
KT-74417 Deduce the metadata version based on LV in KLIB-based backends
KT-75980 [Klib] Reduce serialized size of IrFileEntries for sparse usage of another source files
KT-73826 Deduplicate IrFileEntry that is serialized inside IrInlinedFunctionBlock

Language Design

KT-76926 Allow return in expression bodies if return type is specified explicitly
KT-78866 Show an error for implicit receiver shadowed by context parameter
KT-81561 Update nested type aliases KEEP to reflect local type aliases support
KT-81015 Stabilize nested type aliases
KT-32619 JS: return Promise when continuation is not provided
KT-78976 Decide if K2 should support local functions inside of local inline functions
KT-79308 Ability to actualize empty interfaces as Any
KT-48872 Provide modern and performant replacement for Enum.values()
KT-28850 Prohibit protected visibility in final expected classes

Libraries

New Features

KT-81092 Uuid: support generation of version 7 uuids with a given timestamp
KT-78463 Annotate wasm and JS targets of kotlin-stdlib with @IgnorableReturnValue when appropriate
KT-74444 EnumEntries type should implement RandomAccess
KT-78462 Annotate kotlin-stdlib-jvm with @IgnorableReturnValue where appropriate

Performance Improvements

KT-72111 Change Duration.parseOrNull logic to not throw exceptions internally

Fixes

KT-82901 Long.MIN_VALUE.milliseconds produces invalid denormalized Duration
KT-81995 K/N: CMP: Undefined symbol _kfun:kotlin.time.Duration.kotlin.time.Duration
KT-56822 Deprecate Number.toChar() with error deprecation level
KT-81078 Increase kotlin.io.createTempDir and createTempFile deprecation level to ERROR
KT-74493 Deprecate String.subSequence(start, end) with error and drop it in the future
KT-79192 Increase InputStream.readBytes(Int) deprecation level to HIDDEN
KT-80778 Stabilize kotlin.time.Clock and kotlin.time.Instant
KT-81043 String.toBigDecimalOrNull rejects strings accepted by String.toBigDecimal
KT-81477 Uuid.Companion.generateV* are missing SinceKotlin annotation
KT-81478 FileTreeWalkTest.withDirectoryFilter fails on Windows
KT-74411 Introduce Uuid.generateV4() and generateV7()
KT-80530 Annotate Kotlin/Native stdlib with must-use value/@IgnorableReturnValue when appropriate
KT-79791 Duration.parse incorrectly handles negative decimal seconds in ISO-8601 format
KT-80619 [KLIBs] Enable intra-module inliner in stdlib & kotlin-test
KT-76773 stdlib: contextOf‘s type argument can be inferred via contextOf’s context argument
KT-71822 Intersection with (subtraction from) an identity set may produce incorrect results
KT-80431 Remove suppression of “ACTUAL_ANNOTATIONS_NOT_MATCH_EXPECT” from stdlib
KT-80605 Rename MustUseReturnValue -> MustUseReturnValues
KT-69947 KLIB stdlib: All intrinsics that can be used in KLIBs with inlined IR must be included in stdlib ABI dump
KT-59044 Improve various aspects of TimeSource documentation
KT-80544 Mark controversial path extensions (like .deleteRecursively()) as ignorable
KT-80603 K/N and K/Wasm: \p{N} category is not supported
KT-80661 ArrayDeque.lastIndexOf may return -1 for an element present in the deque
KT-80390 ArrayDeque.indexOf(null) wrongly returns 0 after removals
KT-79094 Change signature of assertFailsWith or make lambda excluded otherwise
KT-72028 Incorrect parameters order in IndexedValue documentation
KT-80130 [stdlib] Commonize AssociatedObjects in commonNonJvmMain
KT-80107 [stdlib] Move CancellationException to commonNonJvmMain
KT-80179 Investigate why StringBuilder.length is not enhanced automatically
KT-80046 Increase test coverage of Duration.parse[IsoString][OrNull] methods
KT-76459 Remove comments about sorting stability in unsigned-type arrays
KT-79489 Generate Stdlib API reference for webMain source set
KT-78243 Drop JS- and Wasm-specific IrLinkageError classes
KT-79108 Remove the default argument for linkageError from kotlin.js.getPropertyCallableRef
KT-79130 K/JS: Remove bodies from intrinsified Long methods
KT-79239 K/Wasm: elementAt extension function of Array/PrimitiveArray/UnsignedArray does not throw IndexOutOfBoundException on incorrect index
KT-79256 K/Wasm: MatchResult.groups raises a trap on invalid group index
KT-57317 Repack EnumEntries from stdlib into the compiler

Native

KT-80620 Bump minimal iOS and tvOS supported versions to 14.0
KT-80624 Bump minimal watchOS supported versions to 7.0
KT-79384 K/N: Application Not Responding: Thread Deadlock
KT-80536 Native: DependencyDownloader seems to have no timeout

Native. Build Infrastructure

KT-80147 Set proper LV and AV for kotlin-native/performance/buildSrc
KT-79474 Kotlin/Native: fix breakpad build
KT-79215 Kotlin/Native: fix distInvalidateStaleCaches on windows

Native. C and ObjC Import

KT-79752 Native: make cinterop generate CCall.Direct annotations
KT-79753 Native: support CCall.Direct calls in the compiler
KT-81312 Native: when -Xccall-mode direct is used, mark unsupported declarations with unresolvable symbol name instead of @Deprecated(ERROR)
KT-79571 Xcode 26 beta 4: CInteropKT39120TestGenerated.testForwardEnum failed
KT-80838 Cinterop fails with an error when Compilation works fine
KT-49034 Kotlin/Native: cnames.structs.Foo resolves into wrong declaration

Native. ObjC Export

KT-81906 Normalize CFBundleIdentifier when producing Apple framework
KT-78810 [ObjCExport] Enable explicit ObjC block parameter names by default
KT-80271 ObjC/Swift Export: Remove Native platform Cloneable checks
KT-78604 Consider not inheriting KlibScope from KaScope
KT-79767 ObjCExport: private companion must not be exposed
KT-79724 ObjCExport: extensions order
KT-79548 ObjCExport: mangling difference between K1 and K2 when translating KotlinDurationCompanion
KT-79475 ObjCExport: invalid property getter translation
KT-79346 ObjCExport: Any method overrides
KT-78871 ObjCExport: translation of keyword release with parameter generates invalid header

Native. Runtime. Memory

KT-75918 Native: Deprecate -Xallocator=std
KT-80678 Native: pagedAllocator=false sweep is slow
KT-75916 Native: Enable sanitizer support with pagedAllocator=false

Native. Swift Export

Fixes

KT-81355 Swift Export: Introduce a flag to turn off coroutines export
KT-80969 Swift Export: Call suspend function as async on swift side
KT-80111 Swift Export Build Fails Due to Errors in KotlinStdlib.swift
KT-80884 Swift Export: support async in SIR
KT-80185 Swift Export: IllegalArgumentException – Collection contains more than one matching element
KT-79889 K/N: swift-export fails under several different conditions
KT-79518 Swift export: represent kotlin.Any as swift.any
KT-78603 Do not inherit SirAndKaSession from KaSession
KT-79227 Swift Export: Fix First Release Issues
KT-79521 ‘_CoroutineScope’ is inaccessible due to ‘internal’ protection level
KT-79181 Swift Export Fails When Using T: Comparable Generic Constraint in Kotlin Classes

Tools. Ant

KT-75875 Remove Ant support

Tools. BCV

KT-80313 Add ability to generate dump from jar files [ABI Tools]

Tools. Build Tools API

New Features

KT-78194 BTA: port the JVM prototype to the new design
KT-79409 BTA: Support removed compiler arguments properly
KT-78193 BTA: Implement core infrastructure according to the new design
KT-78196 BTA: implement API adapter for the prototype implementation
KT-77999 BTA: Generate BTA options from compiler arguments descriptions

Fixes

KT-75357 CompilationService.loadImplementation(loader) Expects a ClassLoader, but Fails if its not a URLClassLoader
KT-73090 Gradle 8.11 kotlin compilation fails when run with -Pkotlin.compiler.runViaBuildToolsApi=true
KT-81321 Deprecate old BTA prototype API
KT-81602 BTA: rename KotlinToolchains.jvm @JvmName for a more Java-friendly API
KT-75356 Failing to pass a -d argument causes Build Tools API to NPE
KT-81130 BTA: using KotlinVersion from stdlib in the API breaks when using isolated classloader
KT-78195 BTA: migrate the test infrastructure from the prototype to the new design

Tools. CLI

KT-81077 Add JVM target bytecode version 25
KT-79867 CompilerConfiguration.configureSourceRoots puts obfuscated file paths instead of ones passed on classpath to CLIConfigurationKeys.CONTENT_ROOTS
KT-80348 Expose ‘XXLanguage’ compiler argument as a normal argument
KT-80428 KMP Separate Compilation: Handle friend dependencies
KT-74590 Deprecate -Xjvm-default in favor of -jvm-default
KT-80349 KMP Separate Compilation is enabled on non-KMP compilations
KT-79982 Fix description of -Xjspecify-annotations
KT-79403 Improve generator for deprecated CLI arguments
KT-75968 Set proper lifecycle for all existing compiler arguments
KT-79293 Create Language Features and compiler argument with parameter for new destructuring features

Tools. Commonizer

KT-49735 [Commonizer] :commonizeNativeDistribution fails for projects with two or more same native targets
KT-47523 MPP: Unable to resolve c-interop dependency if platform is included in an intermediate source set with the only target
KT-48118 Commonized c-interop lib is not attached to common main source set
KT-46248 MPP: Compile KotlinMetadata fails with Unresolved reference if only one native platform from shared source set is available

Tools. Compiler Plugin API

KT-82563 Improve compiler error messages to identify incompatible plugins causing compilation failures
KT-55300 Provide a mechanism to describe ordering and dependencies for compiler plugins
KT-82099 Compiler plugin ordering has no effect
KT-74867 LLFirIdePredicateBasedProvider matches local classes when it shouldn't
KT-52665 Deprecate ComponentRegistrar
KT-75865 Provide an API for setting the file name for the file with top-level declarations generated by a plugin

Tools. Compiler Plugins

New Features

KT-81091 [DataFrame] Receivers from FirExpressionResolutionExtension are not resolved in CodeFragment

Fixes

KT-64339 Symbol Light Classes: No Arg compiler plugin generates synthethic constructor which is not seen from light classes
KT-80429 Power Assert with “Run test using: IntelliJ”: NoClassDefFoundError (org.jetbrains.kotlin.kotlinx.collections.immutable.ExtensionsKt) during compilation
KT-79319 Lombok: NullPointerException on mvn compile when importing Java constants
KT-81348 Incorrect bytecode mentioning error class/package is generated by kotlinx-serialization when private serializer in another module is not accessible
KT-80944 FirUserTypeRefImpl cannot be cast to class FirResolvedTypeRef in maven project
KT-80815 NoArg compiler plugin: Promote NO_NOARG_CONSTRUCTOR_IN_SUPERCLASS diagnostic from warning to error
KT-80822 False positive NO_NOARG_CONSTRUCTOR_IN_SUPERCLASS reported for a class with explicit noargs constructor already present
KT-53122 Constructors generated with NoArg have no @Metadata and are invisible for the frontend
KT-74687 Kotlin Lombok: False positive when calling builder on Java record
KT-80419 Remove bundled jetbrains annotations from kotlin-dataframe-compiler-plugin
KT-79245 [AtomicFU] Drop K1/JS- and K1/Native-specific testrunners
KT-79197 DataFrame: Cannot find local variable ‘this@df’ with type Scope0
KT-73865 Incorrect type is generated for irPropertyReference during K/N transformation

Tools. Compiler plugins. Serialization

KT-70345 Promote COMPANION_OBJECT_IS_SERIALIZABLE_INSIDE_SERIALIZABLE_CLASS diagnostic to error
KT-79695 Serialization does not exclude field-less properties in 2.2.20-Beta2
KT-79246 [Serialization] Drop K1-specific testrunners

Tools. Gradle

New Features

KT-78199 Gradle: Migrate JVM compilation in KGP to the new BTA
KT-45161 Gradle: Support registering generated sources with the Kotlin model
KT-71602 Introduce KotlinTopLevelExtension

Fixes

KT-67290 Deprecate usage of HasKotlinDependencies inside KotlinCompilation
KT-80950 KGP breaks configuration cache when signing plugin with GnuPG is applied
KT-64211 Provide support for the kotlin.internal.compiler.arguments.log.level property while running via build tools api
KT-81719 Do not register swift export related configurations when it's not required
KT-78741 Add FUS analytics for klib cross-compilation
KT-75449 Update deprecation of KotlinJsTestFramework#createTestExecutionSpec
KT-64273 Gradle: remove symbols deprecated after KT-54312
KT-74915 Make ExtrasProperty.kt internal
KT-64992 Remove KotlinCompilation.source
KT-82068 Workaround iOS Simulator start failure in IT
KT-79482 Report webMain / webTest usage in FUS metrics
KT-81199 Deprecate “org.jetbrains.kotlin.android” plugin
KT-82244 Conflicting warnings when using AGP 9.0.0-alpha with built-in Kotlin disabled
KT-81161 Gradle plugin api reference: compiler arguments types are not available
KT-70251 Gradle: hide compiler symbols in KGP
KT-81837 Run integration tests against AGP 8.13
KT-77457 Compile against Gradle API 9.0
KT-79238 Bump minimal supported AGP version to 8.2.2
KT-75869 KGP JS - Update deprecated constructors
KT-76720 Raise deprecation level to error for Kotlin*Options properties
KT-79047 Gradle compileKotlin fails with configuration cache
KT-81415 BTA: Duplicate daemons when compiling JVM + JS in KGP
KT-80763 Add redirect link to error message when ‘org.jetbrains.kotlin.android’ plugin is used with built-in Kotlin
KT-81038 Gradle: remove support for properties disabling precise task outputs backup
KT-80808 Warning from kotlin-dsl with kotlin(“jvm”) on Gradle < 9.0 doesn’t suggest updating Gradle
KT-80875 Gradle: runToolInSeparateProcess may fail on Windows with too long command line
KT-79851 Emit an actionable warning/error on unsupported AV/LV configured by kotlin-dsl
KT-77458 Run Gradle integration tests against Gradle 9.0
KT-80172 Error message changes depending on the order of applying ‘org.jetbrains.kotlin.android’ and ‘AGP’ 9.0+ with built-in Kotlin plugin
KT-76177 Remove deprecated classpath snapshot task inputs
KT-79339 Remove additionalMetadata from compiler options DSL
KT-73478 Add module level description
KT-80083 KGP IT: fix tests on Windows
KT-79034 Automatically disable cross compilation if it's not supported on the host
KT-79408 A lot of errors files are created when compile Kotlin
KT-78827 Rewrite Gradle compiler options DSL generator

Tools. Gradle. BCV

KT-80687 Add description to Gradle tasks [ABI Validation]
KT-80621 Move Gradle tasks into suitable groups [ABI Validation]
KT-78625 Kotlin's built-in BCV generates empty .api files

Tools. Gradle. Compiler plugins

KT-81827 Add a switch for mapping file tasks in Compose Gradle plugin

Tools. Gradle. JS

Fixes

KT-79921 Web Tooling Gradle API does not respect webpack reconfiguration
KT-81009 K/JS, Wasm: Promote deprecation of NPM and Yarn package manager internal functions
KT-76019 Wasm/JS: Promote phantom-js for Karma deprecation to ERROR
KT-81005 K/JS, Wasm: Promote deprecation of ExperimentalWasmDsl to Error
KT-81010 K/JS, Wasm: Promote deprecation of internal JS functions to Error
KT-81008 K/JS, Wasm: Promote deprecation of ExperimentalDceDsl to Error
KT-81007 K/JS, Wasm: Promote deprecation of public constructors of JS declarations to Error
KT-81006 K/JS, Wasm: Promote wasm declarations in “js” package deprecation to Error
KT-81004 K/JS, Wasm: promote deprecation NodeJsExec.create to Error
KT-75621 KJS / Gradle: Disable npm in --offline mode
KT-79910 Wasm, JS: Upgrade NPM versions
KT-76996 Wasm: js tasks triggers wasm subtasks
KT-79237 Upgrade NPM dependencies versions

Tools. Gradle. Multiplatform

New Features

KT-76446 Add kotlin-level dependency block to work the same way as commonMain/commonTest dependencies blocks

Fixes

KT-61127 Remove scoped resolvable and intransitive DependenciesMetadata configurations used in the pre-IdeMultiplatformImport IDE import
KT-81980 KGP warning gives incorrect suggestion for AGP application compatibility
KT-81601 With android.builtInKotlin=false AGP 9.0+, using kotlin-multiplatform plugin will fail with aClass Cast Exception
KT-81060 KMP stores common compilation dependency resolution in Configuration cache leading to error when deserializing (Android only)
KT-80720 Gradle import of multiplatform project fails: “Failed to invoke getAssociateWith on KotlinJvmCompilation_Decorated”
KT-81200 Deprecate ‘androidTarget’
KT-74005 Implement a prototype of Unified Klib support in Kotlin Gradle Plugin
KT-77367 [uklib] Project dependency to kotlin-jvm module leads to failure in transform during IDE import
KT-80785 With android.builtInKotlin=false and android.newDsl=true, using kotlin-android plugin will fail with ClassCastException
KT-81434 [uklib] androidCompileClasspath resolves java compatibility variant instead of android for uklib library
KT-81469 [uklib] kmpPublicationStrategy affects resolution during import for androidTarget
KT-81249 Kotlin 2.2.20 broke KMP implementation of Parcelize
KT-77066 Promote kotlinArtifacts deprecation to an error
KT-74955 Remove resources resolution strategy completely
KT-62614 Remove legacy kotlin-gradle-plugin-model
KT-79559 AGP complains about configurations resolved at configuration time due to KMP partially resolved dependencies diagnostic
KT-78993 The value for property ‘*’ property ‘dependencies’ is final and cannot be changed any further
KT-76200 TestModuleProperties.productionModuleName for JVM module isn't present with 2.1.20-RC
KT-55312 Replace “ALL_COMPILE_DEPENDENCIES_METADATA” configuration with set of metadata dependencies configurations associated per set
KT-52216 HMPP / KTOR: False positive “TYPE_MISMATCH” with Throwable descendant
KT-54312 TCS: Replace CompilationDetails abstract class hierarchy by composable implementation
KT-55230 Remove metadata dependencies transformation for runtimeOnly scope

Tools. Gradle. Native

KT-80675 Commonized cinterops between “test” compilations produce an import failure
KT-77732 commonizeCInterop failed with “Unresolved classifier: platform/posix/size_t”
KT-81510 commonizeCInterop exception with ‘kotlinNativeBundleConfiguration’ not found
KT-81134 Native: Gradle configuration failure likely related to Klibs cross-compilation
KT-77486 Remove bitcode DSL
KT-64107 Kotlin Gradle plugin allows native binaries to have both debuggable and optimized flags set to true
KT-74910 Bump destinationDir in CInteropProcess to hidden
KT-74911 Promote CInteropProcess.konanVersion to hidden
KT-74864 Enable exporting KDocs by default to ObjC
KT-72705 K/N: compile task cache can not be used due to ‘artifactVersion’ input property

Tools. Gradle. Swift Export

KT-81465 Swift Export package is build with wrong target
KT-81460 [KGP] Crash in SwiftExportRunner due to older stdlib
KT-79524 NoSuchMethodError: 'java.lang.String org.gradle.api.artifacts.ProjectDependency.getPath() for swift export with dependency export fro gradle < 8.11

Tools. Incremental Compile

KT-75864 Implement a conservative mechanism of the IC with compiler plugins generated top-level declarations
KT-55982 K2: Consider global lookups from plugins in incremental compilation
KT-79504 Implement an API to provide IC lookups from backend plugins
KT-75657 Fix difference in incremental compilation scenarios in BTA in-process vs daemon compilation mode
KT-79541 Refactor tracking of files relation in IC
KT-74628 Incremental compilation runner does not check compiler exit code before mapping sources to classes

Tools. JPS

KT-77347 Support file-less compatible IC approach

Tools. Kapt

KT-79138 K2: KAPT Java Stub Gen: Unresolved reference with @kotlin.Metadata in Java in 2.2.0
KT-79133 K2 kapt: class literal with typealias is not expanded
KT-79305 K2 kapt: ISE “Cannot evaluate IR expression in annotation” on typealias with unresolved expansion
KT-79136 K2 kapt: unresolved nested class references in annotation arguments are generated without outer class names
KT-71786 K2Kapt: Stubs generation does not fail on files with declaration errors
KT-80843 K2: KAPT: Crash on any data class with duplicate properties: “Sequence contains more than one matching element”
KT-73411 Remove kapt.use.k2 property and code which allows to use K2 with K1 kapt
KT-79641 Kapt: too much information is printed in verbose mode

Tools. Maven

KT-82180 kotlin-maven-plugin: IC succeeds after dependent source deletion
KT-78201 Maven: migrate JVM compilation to the new BTA
KT-81414 2.2.20 regression: OOM (Compressed class space) when in-process
KT-81435 Maven: Improve BTA classloader reusage
KT-81681 Maven: “NoClassDefFoundError” on a second test run
KT-81218 Kotlin Maven Plugin 2.2.20: Java classes not resolved with enabled incremental compilation without daemon

Tools. Performance benchmarks

KT-79709 Add -Xdetailed-perf CLI flag to control verbosity of performance logs
KT-79226 [K/N] Add performance measurement for native backend lowerings

Tools. REPL

KT-80062 ReplSnippetLowering sometimes produces IrConstructorCall with too many arguments

Tools. Scripts

KT-80071 Kotlin script mode produces invalid IR: “value that is not available in the current scope”

Tools. Statistics (FUS)

KT-77407 Add performance measurement for prefix lowerings
KT-79455 [FUS] Collect KSP plugin version
KT-79090 Integrate dynamic stats into MarkdownReportRenderer

Tools. Wasm

KT-82365 K/Wasm: NodeRun tasks in Wasi depend on kotlinWasmToolingSetup
KT-81313 K/Wasm: update Node.js to 24.x
KT-81315 K/Wasm: update Node.js to 25.x
KT-80582 Multiple reloads when using webpack dev server after 2.2.20-Beta2
KT-80896 K/Wasm: debug tests only once
KT-78921 K/Wasm: don't generate empty yarn.lock file