Changelog

Analysis API

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

Analysis API. FIR

Performance Improvements

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

Fixes

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

Analysis API. Light Classes

• KT-73492 K2. FP error in Java file when using [@JvmSuppressWildcards](https://github.com/JvmSuppressWildcards) annotation without arguments

Analysis API. Providers and Caches

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

Analysis API. Standalone

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

Analysis API. Surface

New Features

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

Performance Improvements

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

Fixes

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

Backend. Wasm

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

Compiler

New Features

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

Performance Improvements

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

Fixes

• KT-70789 CLI error "mixing legacy and modern plugin arguments is prohibited" on using -Xcompiler-plugin unless default scripting plugin is disabled
• KT-74024 K2: Prohibit declaring local type aliases
• KT-73858 Compose / iOS: NullPointerException on building
• KT-73864 [Native] Decouple IrType.computePrimitiveBinaryTypeOrNull from backend.native
• KT-73122 Move the upgrade references lowering to be first one in Native pipeline
• KT-73608 K2: "Initializer type mismatch" with map and typealias to object
• KT-74104 Native: SynchronizedLazyImpl produces NPE on 2.1.20-Beta1 on mingwX64
• KT-74147 K2: False negative INCONSISTENT_TYPE_PARAMETER_VALUES
• KT-73454 K2: Fix type parameters mapping for typealiases with inner RHS
• KT-73043 K2 Compiler does not allow references to inner constructors with typealiases
• KT-74040 Compilation of inner class usage does not check the visibility of parent class during compilation in different rounds
• KT-74195 Fully qualified names in error messages make them complicated
• KT-74221 Make FirSupertypesChecker a platform checker
• KT-72962 Consider enabling ConsiderForkPointsWhenCheckingContradictions LF earlier
• KT-74242 Freeze on runCatching call in finally block inside SAM conversion
• KT-73903 Design 'replaceWith' / 'test-only' kinds for the 'LanguageFeature' class
• KT-29222 FIR: consider folding binary expression chains
• KT-73760 Cannot implement two Java interfaces with [@NotNull](https://github.com/NotNull)-annotated type argument and Kotlin's plain (nullable) type parameter
• KT-58933 Applying suggested signature from WRONG_NULLABILITY_FOR_JAVA_OVERRIDE leads to red code
• KT-74107 K2: Calling type alias constructor with inner RHS in static scope causes runtime crash
• KT-74244 Context parameters: context isn't checked for expect/actual property declaration
• KT-74276 Update ASM from 9.0 to 9.6.1
• KT-72295 K2: Generated accessors for delegated property should have property source
• KT-73150 Investigate/test approximation of context parameter type in completion
• KT-73862 [Native] Decouple NativePreSerializationLoweringContext from backend.native
• KT-72677 K2 IDE / Kotlin Debugger: “Couldn't find virtual file for p1/MainKt$foo$iface$1” on evaluating inline function from another module
• KT-72672 K2 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-73937 Context parameters: IllegalArgumentException: source must not be null on lateinit var with a context
• 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-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-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-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-73494 Enable first-only-warn annotation defaulting mode
• KT-59880 K2: Disappeared CONFLICTING_OVERLOADS
• 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-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-72832 Erroneous implicit cast inserted by smartcast
• KT-57358 False positive "Const 'val' initializer should be a constant value" caused by equality with literals
• KT-58437 K2: Do not use descriptors in KonanSymbols
• KT-18563 Do not generate inline reified functions as private in bytecode

Compose compiler

• b/388505454 Change order of $changed bits with context parameters
• b/165812010 Support default values in open [@Composable](https://github.com/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

IR. Inlining

• 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-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

IR. Interpreter

• KT-72356 K2 Native: IllegalStateException when annotation has the same source range as a constant in another file

IR. Tree

• KT-74496 8% performance regression in lowerings
• KT-73224 Migrate compiler.ir.interpreter to new IR parameter API
• KT-73179 Drop IrAttributeContainer
• KT-73222 Migrate compiler.ir.inline to new IR parameter API
• KT-73553 [Native] Create testrunners for serialization tests
• KT-72735 Add new IR nodes for callable references
• KT-73248 Merge FileValidator and CheckIrElementVisitor into IrValidator

JavaScript

Performance Improvements

• KT-71199 K/JS: charSequenceGet intrinsic should bypass Char range checks
• KT-73759 KJS: do not fillArrayVal if using an Array init function

Fixes

• 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-70987 KJS: [@JsExport](https://github.com/JsExport): NullPointerException with private data class
• KT-72974 KJS / ESModules: EagerInitialization annotation has no effect on unused properties
• KT-71788 KJS: NPE when use [@JsExport](https://github.com/JsExport) with [@JsPlainObject](https://github.com/JsPlainObject)
• KT-72598 KJS: Nested [@JsPlainObject](https://github.com/JsPlainObject) does not work
• KT-70078 [@JsPlainObject](https://github.com/JsPlainObject) compiles broken code when inlining suspend function
• KT-68904 [@JsPlainObject](https://github.com/JsPlainObject) breaks when inside a file with [@file](https://github.com/file):JsQualifier
• KT-74067 KJS: ES class constructor is generated with 'return this'
• KT-72883 [JS] AbstractSuspendFunctionsLowering crashes on private top level suspend fun

Klibs

• KT-74050 Kotlin 2.1.0 with K1 throws a signature mismatch of Ir and Descriptor for Composable lambda
• KT-70146 [KLIB Resolve] Don't fail on nonexistent transitive dependency
• KT-74045 Context parameters: conflicting signatures for properties with/without context on the non-JVM backends
• 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-67474 K2: Missing [@ExtensionFunctionType](https://github.com/ExtensionFunctionType) in metadata in KLIBs

Libraries

New Features

• KT-72480 Move Instant and Clock from kotlinx-datetime to stdlib

Fixes

• KT-28492 Merge sources when building kotlin-osgi-bundle
• KT-62423 Consider providing Common atomic types
• 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-69575 kotlin.uuid.Uuid is not Comparable
• KT-74173 The sample code of lazy on stdlib can not run on playground due to "samples" package import
• 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-73747 AtomicBoolean.asJavaAtomic() and AtomicBoolean.asKotlinAtomic() have unnecessary type parameter
• KT-73816 Moving common Atomics to kotlin.concurrent.atomics package
• KT-73820 Part 2. Moving Atomics to kotlin.concurrent.atomics: move the API to the new package
• KT-73654 Remove org.w3c packages from stdlib documentation
• KT-71762 ReplaceWith properties kdoc is rendered with extra spaces
• KT-73743 UninitializedPropertyAccessException on AtomicReference initialization
• KT-73740 Unresolved reference 'AtomicBoolean' in 2.1.20-Beta1
• KT-73817 Part 1. Moving Atomics to kotlin.concurrent.atomics: bootstrap updates
• KT-54859 kotlin.repeat should document behavior in the case of negative arguments
• KT-73762 Warn about [@Transient](https://github.com/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-73695 PublishedApi KDoc's link to inline functions page is not rendered properly
• KT-71628 Review deprecations in stdlib for 2.1
• KT-69545 Kotlin/Native: Deprecate API marked with FreezingIsDeprecated to error

Native

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

Native. C and ObjC Import

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

Native. Swift Export

• KT-73623 Swift Export: Interfaces: Add protocol printing

Tools. CLI

• KT-74099 Add CLI argument to enable nested type aliases feature
• 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-73319 Migrate the main JVM CLI pipeline to the phased structure
• KT-73244 :compiler:cli-base depends on :compiler:ir.serialization.jvm to read a single property

Tools. Commonizer

• KT-74623 Drop metadata version check from KLIB commonizer

Tools. Compiler Plugins

• KT-74315 Kotlin Lombok: "Unresolved reference" on generating [@Builder](https://github.com/Builder) for static inner class where outer class is also using [@Builder](https://github.com/Builder)
• KT-73871 PowerAssert: Comparison via operator overload results in confusing diagram
• KT-73897 PowerAssert: Implicit argument detection is brittle in a number of cases
• 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

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

Tools. Gradle

New Features

• KT-41409 Gradle: Support binaries.executable for jvm targets
• KT-58830 Expose AdhocComponentWithVariants API on KGP generated component

Fixes

• KT-74124 Gradle: error message regression of incompatible Gradle version usage
• KT-74095 Make ToolingDiagnosticBuilder internal API
• KT-74322 Enable source information by default in Compose compiler gradle plugin
• KT-73974 Configuration cache when run Xcode tasks without xcode's environment
• KT-74415 Make composeCompiler.includeSourceInformation true by default
• KT-74476 KGP uses internal Gradle API, DefaultArtifactPublicationSet
• 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-73782 KGP diagnostics reporter: emojis added to KGP warning/errors are displayed broken on Windows
• KT-72337 kotlin-android-extensions plugin should fail the build on apply
• KT-74143 Gradle: Add workaround for https://github.com/gradle/gradle/issues/31881
• KT-72384 Run Gradle Integration tests against Gradle 8.11
• KT-67277 Gradle: decommission properties to disable precise task outputs backup

Tools. Gradle. JS

• 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

Tools. Gradle. Multiplatform

• 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-70493 Improve gray-box testing experience in KGP-IT
• KT-49155 MPP, Gradle: Cannot use test-retry-gradle-plugin with Kotlin multiplatform tests
• KT-71888 Default Target Hierarchy results in very large heap usage/OoM when resolving IDE dependencies in larger projects

Tools. Gradle. Native

• KT-73572 [Gradle] kotlin.native.cacheKind=none doesn't work anymore
• KT-71722 kotlinNativeBundleConfiguration present in JVM-only Gradle project
• KT-71398 kotlinNativeBundleConfiguration should not contain dependencies on unsupported platforms

Tools. Incremental Compile

• 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