Changelog

Analysis. API

Fixes

• KT-65417 K2 IDE: KTOR false positive expect-actual matching error on enum class because of implicit clone() in non-JVM source sets
• KT-68882 Analysis API: Refactor KaSymbols
• KT-68689 LL API: support analysis from builtins module
• KT-67775 Analysis API: expose only interfaces/abstract classes for the user surface
• KT-68009 K2: lowering transformers of Compose compiler plugin access AbstractFir2IrLazyFunction modality, which results in null point exception
• KT-68918 collectCallCandidates works incorrectly for parenthesis invoke
• KT-68462 Analysis API: Integrate project-structure module into analysis-api and analysis-api-platform-interface
• KT-69131 AA: "provideDelegate" operator is not resolved from the delegation reference in FIR implementation
• KT-69055 Analysis API: Stabilize KaScopes
• KT-68959 Introduce KaSeverity
• KT-68846 Mark KaFirReference and all implementations with internal modifier
• KT-68845 Move KaSymbolBasedReference to resolution package
• KT-68844 Move KaTypeProjection to types package
• KT-65849 K2: Rename 'high-level-api' family of JARs to 'analysis-api'
• KT-62540 Remove uses of TypeInfo.fromString and TypeInfo.createTypeText from Kotlin plugin
• KT-68155 Analysis API: Add PSI validity check to analyze
• KT-62936 Analysis API: NativeForwardDeclarationsSymbolProvider is not supported for Kotlin/Native

Analysis. Light Classes

• KT-68261 SLC: Constructors of sealed classes should be private
• KT-68696 Drop DecompiledPsiDeclarationProvider-related stuff
• KT-68404 SLC: wrong binary resolution to declaration with [@JvmName](https://github.com/JvmName)

Backend. Native. Debug

• KT-67567 Native: after updating to LLVM 16 lldb hangs when smooth stepping

Backend. Wasm

• KT-68828 Wasm test failure. expect-actual. private constructor in expect

Compiler

New Features

• KT-58310 Consider non-functional type constraints for type variable which is an expected type for lambda argument
• KT-57872 Improve "Public-API inline function cannot access non-public-API" check

Fixes

• KT-65546 K2. implement extended checker for unused anonymous parameter in lambda
• KT-60445 K2/Java: investigate possible symbol clash while enhancing Java class type parameter bounds
• KT-68358 [@EnhancedNullability](https://github.com/EnhancedNullability) is missing on value parameter type after inheritance by delegation with strict JSpecify enabled
• KT-67791 False negative "Synchronizing by Meters is forbidden" with inline value classes
• KT-69495 k2: inconsistent output of unsigned number in string templates
• KT-67693 Implement checkers for K1 compiler which will check the usage of K2 new features and report that they are not supported in K1 compiler
• KT-44139 Don't report overload resolution ambiguities if arguments contain an error type
• KT-69282 K2: equality of unsigned types with nullability works incorrectly
• KT-69619 K2. JAVA_TYPE_MISMATCH when Kotlin out generic type used in Java
• KT-68996 K2: "Not enough information to infer type argument" caused by typealias annotation with fixed generic argument
• KT-69563 trying to call .source on FirPackageFragmentDescriptor results in exception
• KT-69611 Internal annotation FlexibleArrayElementVariance is written to output jar
• KT-69463 K2: false negative SUPER_CALL_WITH_DEFAULT_PARAMETERS with expect/actual declarations
• KT-68556 K2: false negative PROPERTY_WITH_NO_TYPE_NO_INITIALIZER on uninitialized property without type
• KT-68997 K2: "No accessor found" for an inline value class when query the value of a delegated class by reflection
• KT-68724 K2: "ABSTRACT_MEMBER_NOT_IMPLEMENTED" caused by open modifier on interface
• KT-68667 K2: Compiler hangs on mapNotNull and elvis inside lambda
• KT-68747 K2: Long compilation time because of constraint solving when using typealias in different modules
• KT-68940 K2: "IllegalArgumentException: All variables should be fixed to something"
• KT-69182 K2: OptIn on enum companion blocks enum constants
• KT-69191 K2: "Unresolved reference" caused by nested data objects
• KT-68797 K2 / Native: "java.lang.IllegalStateException: FIELD" caused by enabled caching
• KT-69569 Wrong paths when one type has multiple annotated arguments
• KT-63871 K2: different value of isNotDefault flag for property inherited from delegate
• KT-63828 K2: Missing signature metadata for accessors of properties inherited from delegate
• KT-68669 K2: Generate inherited delegated members after actualization
• KT-69402 FirSupertypeResolverVisitor: ConcurrentModificationException
• KT-68449 K2: "when" expression returns Unit
• KT-67072 K2: inconsistent stability of open vals on receivers of final type
• KT-68570 K2: "Unresolved reference" in call with lambda argument and nested lambda argument
• KT-69476 False negative NO_ELSE_IN_WHEN on when over intersection type with expect enum/sealed class
• KT-67069 K2: Delegated member calls interface method instead of fake override
• KT-63864 K2: Missing abbreviated type in metadata
• KT-69421 K2: Resolve changed from delegated function to java default function
• KT-69392 K2: "UNSAFE_CALL": when with some variable subjects does not smartcast the variable
• KT-69159 K2: KotlinNothingValueException in Exposed
• KT-69053 K2: Unsupported intersection overrides for fields
• KT-69227 K2: "Argument type mismatch" caused by generic typealias and upper bound
• KT-31371 NOT_YET_SUPPORTED_IN_INLINE: incorrect error message for local inline function
• KT-49473 PROTECTED_CALL_FROM_PUBLIC_INLINE_ERROR: specialize error message for 'inline' property
• KT-49474 NON_PUBLIC_CALL_FROM_PUBLIC_INLINE: specialize error message for 'inline' property
• KT-49503 SUPER_CALL_FROM_PUBLIC_INLINE_ERROR: specialize error message for 'inline' property
• KT-11302 On inapplicable '[@JvmStatic](https://github.com/JvmStatic)' annotation, highlight only the annotation, not the function signature
• KT-59510 K2: do not render annotations in the deprecation diagnostic
• KT-68532 "This code uses error suppression for 'INAPPLICABLE_JVM_NAME'. While it might compile and work, the compiler behavior is UNSPECIFIED and WON'T BE PRESERVED"
• KT-68859 K2: unable to suppress only "JAVA_MODULE_DOES_NOT_EXPORT_PACKAGE"
• KT-68623 K2: "Only safe or null-asserted calls are allowed" on safe call
• KT-68364 JVM: ISE "Bad exception handler end" on a non-local break/continue inside try with finally
• KT-68469 [K2] MISSING_DEPENDENCY_CLASS caused by redundant @file:JvmName
• KT-68999 K2: Unify the style of FIR generator with IR and SIR tree-generators
• KT-66061 Kotlin/Native - building shared module for iOS - Argument list too long
• KT-67804 removeFirst and removeLast return type with Java 21
• KT-49420 Suspicious behaviour of frontend in case of DefinitelyNotNull type overload
• KT-59752 K2: "Conflicting overloads" if function with same signature added to different contexts
• KT-68618 K1: Unresolved reference for qualified this in implicit type
• KT-25341 NOT_YET_SUPPORTED_IN_INLINE reported over anonymous object border
• KT-69044 Destructuring declaration shouldn't be possible in declaration in when
• KT-69028 K2: FirJvmActualizingBuiltinSymbolProvider returns null on builtins declarations if common source-set is not presented
• KT-67119 Migration warning from context receivers to context parameters
• KT-15704 Rethink usage of term "type annotation" in error messages
• KT-68970 K2. Argument type mismatch caused by out projection in inferred type from if - else
• KT-68727 K2: "Null argument in ExpressionCodegen for parameter VALUE_PARAMETER" caused by an enum class with default parameter in a different module
• KT-68626 K2: "Conflicting Overloads" for function if inherited from generic type
• KT-68800 K2: Delete ConeAttributes.plus method
• KT-59389 K2: Missing AMBIGUOUS_LABEL
• KT-68803 K2: Smart cast fails with "Unresolved reference" when [@Suppress](https://github.com/Suppress)("UNCHECKED_CAST") used in statement
• KT-68968 K2: Missing ILLEGAL_SUSPEND_FUNCTION_CALL diagnostic in initialization code of a local class inside suspend function
• KT-68489 K2: WRONG_ANNOTATION_TARGET with Java and Kotlin [@Target](https://github.com/Target) annotation positions
• KT-68517 "IrSimpleFunctionSymbolImpl is unbound" for actual class containing non-actual functions
• KT-59678 K2: Investigate ConeKotlinType.unCapture()
• KT-64193 K2: No smartcast with two boolean expressions in a row
• KT-69058 K2: Java-defined property annotations not persisted
• KT-69027 K2: Initialize FirStdlibBuiltinSyntheticFunctionInterfaceProvider in library session
• KT-62818 K2: improve VAR_OVERRIDDEN_BY_VAL diagnostic message
• KT-68214 Rename TypeApproximatorConfiguration properties for clarity
• KT-64515 K2 IDE: [NEW_INFERENCE_ERROR] in a build.gradle.kts script while applying "jvm-test-suite" plugin and then configuring targets for test suites
• KT-68093 Implement deprecation of smartcasts on class-delegated properties
• KT-67270 Native: report more performance metrics from the compiler
• KT-68621 DATA_CLASS_INVISIBLE_COPY_USAGE false negative for inline fun
• KT-68575 K2: [@ParameterName](https://github.com/ParameterName) annotation is not erased when inferring the type of it in lambdas
• KT-69000 Can't render constructor of intersection type
• KT-68401 K2: "IllegalAccessError: failed to access class" caused by package private super Java type, when inferencing a common super type of if or when branches on JVM
• KT-68806 K/Wasm RuntimeError: unreachable on Sequence::toList
• KT-68849 K2: "ClassCastException: cannot be cast to kotlin.jvm.functions.Function2" caused by passing lambda to SAM constructor results
• KT-68455 K2: False negative UPPER_BOUND_VIOLATED_BASED_ON_JAVA_ANNOTATIONS
• KT-61744 Native: -Xsave-llvm-ir-after fails to check errors from LLVMPrintModuleToFile
• KT-68874 Types with different captured types as type arguments are rendered incorrectly
• KT-67103 Support AbbreviatedTypeAttribute for aliased types from the source code
• KT-65038 K2: Type alias from indirect dependency causes MISSING_DEPENDENCY_CLASS error
• KT-63921 K2: different representation of recursive type aliases
• KT-68538 KJS/K2: using while with break inside inline lambdas leads to an endless cycle
• KT-68679 K2: "Override has incorrect nullability in its signature compared to the overridden declaration" caused by subclass of Android HashMap
• KT-68734 K2: enum class in KMP: Expect declaration MMKVLogLevel is incompatible with actual MMKVLogLevel because modality is different
• KT-68820 K2: "Unresolved reference" on calling function with "contract" name
• KT-68230 K2: FirMissingDependencyClassChecker: Not supported: ConeFlexibleType
• KT-68531 K2: False-negative error on assignment to enum entry
• KT-68571 K2: "IllegalStateException: Fake override should have at least one overridden descriptor" caused by exceptions and when statement
• KT-68523 K2: FileAnalysisException when using Definitely non-nullable types
• KT-68339 K2: "Enum entry * is uninitialized here" caused by lazy property with enum in when expression
• KT-68678 K2: Drop using FirBuiltinSymbolProvider while compiling JVM stdlib
• KT-68585 Implement new rules for CFA about enum entries
• KT-68110 K2: "Java type mismatch" caused by spring.Nullable
• KT-68613 K2: False positive CONFLICTING_PROJECTION after fixing KT-67764
• KT-67764 K2: False negative: Projection problem is not reported in is expression
• KT-68542 K2: Fix referecing to [@ExtensionFunctionType](https://github.com/ExtensionFunctionType) if it's declared in source
• KT-68188 K2: Properly support FunctionN creation for stdlib compilation
• KT-67946 K2: Crash on red code: Instead use FirErrorTypeRef for ERROR CLASS: Cannot infer argument for type parameter T
• KT-68617 K2: Secondary constructors in a sealed class have private visibility instead of protected in the generated IR
• KT-63920 K2: Private secondary sealed class constructor is private in metadata, but protected in K1
• KT-68207 K2: Investigate if losing ConeIntersectionType.upperBoundForApproximation during approximation leads to any issues
• KT-51433 FE 1.0: implement warnings about label resolve changes

Compose compiler

New features

• 192e556 Strong skipping is now enabled by default
• 842a9e8 Add support for default parameters in abstract and open [@Composable](https://github.com/Composable) functions b/165812010

Fixes

• e207b05 Fixes group generation for if statements when nonSkippingGroupOptimization is enabled b/346821372
• f64fc3a Fixes endToMarker generation in early return from inline lambdas that caused start/end imbalance b/346808602
• d6ac8a5 Stop memoizing lambdas with captured property delegates b/342557697
• f38d5a3 Stop capturing parameter meta across crossinline boundary b/343801379
• 770fe8d Propagate annotations from inferred function types when serializing b/345261077
• 3c67cda Fix memoization of captureless lambdas when K2 compiler is used b/340582180
• 3281e53 Allow memoizing lambdas in composable inline functions b/340606661

IR. Actualizer

• KT-68830 Compiler crash on missing actual class
• KT-69024 K2: Children of expect annotation with [@OptionalExpectation](https://github.com/OptionalExpectation) should be actualized
• KT-68742 Allow expect protected to Java protected actualization
• KT-66436 K2. Actualizing modCount property with a field in AbstractMutableList
• KT-68741 Support actualization of AbstractMutableList.modCount
• KT-68801 Crash on access of fake override of function actualized by fake override

IR. Inlining

• KT-68100 Run IR validation in the beginning and the end of the common prefix
• KT-69171 Introduce a temporary -X CLI parameter that enables double-inlining
• KT-69006 Enable IR visibility checks after IR inlining
• KT-69183 IR inlining: properly handle defaults that depends on previous value parameters
• KT-68558 Move InlineCallableReferenceToLambdaPhase into ir.inline module

IR. Tree

• KT-68784 Support validating visibility of referenced declarations in IrValidator
• KT-68174 Delete the IrMessageLogger interface
• KT-67082 Introduce attributes on IrElement
• KT-67695 ForLoopsLowering fails to handle a loop over an imprecise typed iterable
• KT-68716 DeepCopyIrTreeWithSymbols.visitConst should remap const type

JavaScript

• KT-66898 KJS: Reserved keywords not escaped when -Xir-generate-inline-anonymous-functions is enabled
• KT-69400 Use correct type for references on local functions when transforming them into lambda
• KT-68554 Legalize marker interface as parent for JSO (interface marked with [@JsPlainObject](https://github.com/JsPlainObject))
• KT-68891 [@JsPlainObject](https://github.com/JsPlainObject) fails to compile when encountering reserved keywords as interface properties
• KT-69023 KJS / IR: globalThis is mandatory, breaking older browsers support
• KT-68641 KJS: 'export was not found' with per-file mode on case-insensitive filesystem
• KT-68632 K2: allow JS_NAME_CLASH suppression
• KT-68620 [wasm] [js] Default param in inner class method fails if we are referring generic extension property

Klibs

• KT-66605 [KLIB] Excessive creation of BaseKotlinLibrary during resolving libs
• KT-68824 API 4 ABI: Don't show sealed class constructors

Language Design

• KT-68636 Incorrect private_to_this visibility for data class with a private constructor

Libraries

• KT-31880 UUID functionality to fix Java bugs as well as extend it
• KT-60787 Cannot ignore alpha when formatting with HexFormat
• KT-66129 Minor issues with HexFormat
• KT-57998 implement Base64.withoutPadding
• KT-67511 provide equals() and hashCode() implementations for kotlinx.metadata.KmType
• KT-68240 stdlib: proper expects for internal API used in intermediate shared source sets
• KT-68840 atomicfu-runtime: annotate some internal functions with [@PublishedApi](https://github.com/PublishedApi)
• KT-68839 Annotate kotlin.js.VOID property with [@PublishedApi](https://github.com/PublishedApi)

Native

• KT-69206 Native: updating to LLVM 16 breaks debugging in lldb on Linux
• KT-68640 Native: updating to LLVM 16 changes behavior of used attribute in C/C++ code
• KT-58097 Kotlin/Native: improve the error message if Xcode is not properly configured

Native. ObjC Export

• KT-57496 linkReleaseFrameworkIosArm64: e: Compilation failed: An operation is not implemented

Native. Runtime. Memory

• KT-68871 Native: Unexpected barriers phase during STW: weak-processing

Native. Swift Export

• KT-69469 Exporting object twice causing crash
• KT-69251 Get rid of context receivers from ./native/.../lazyWithSessions.kt
• KT-68865 Move config into test-directives

Native. Testing

• KT-69235 Incorrect handling of friend dependencies in Native test infra
• KT-67436 Native: support CLI tests

Reflection

• KT-69433 KotlinReflectionInternalError on non-reified type parameter in typeOf inside an inline lambda
• KT-68675 K2: KotlinReflectionInternalError on non-reified type parameter in typeOf inside a lambda

Tools. Build Tools API

• KT-68555 BTA test infra: top level declarations are invisible across modules

Tools. CLI

• KT-68838 OutOfMemory when compiling in CLI
• KT-68743 Extract common CLI arguments for all KLIB-based backends
• KT-68450 CLI: errors related to module-info are reported even if there are no Kotlin source files

Tools. CLI. Native

• KT-66952 Native: konanc fails when KONAN_HOME is under path with spaces

Tools. Commonizer

• KT-68835 Command line length overflow on Linux/Windows while invoking commonizer via :commonizeDistribution

Tools. Compiler Plugins

• KT-69401 Kotlin power assert plugin doesn't work correctly with safe cast operator
• KT-69290 PowerAssert: implicit receivers included in power-assert generated diagram
• KT-68511 Power Assert kotlinx.assertEquals message display problem
• KT-68807 Power-Assert crashes the Kotlin compiler when if expression used as assertion parameter
• KT-68557 K2. Supertypes resolution of KJK hierarchy fails in presence of allopen plugin

Tools. Compiler plugins. Serialization

• KT-68931 JS/Native + serialization: partial linkage error
• KT-69039 FIR: Implement IDE-only checker for kotlinx.serialization compiler plugin to report IDE-only diagnostics
• KT-68752 Serializable annotation on Java class is not taken into account in K2 checker

Tools. Daemon

• KT-68297 KGP 2.0 regression: JAVA_TOOL_OPTIONS is not considered in Kotlin daemon creation

Tools. Fleet. ObjC Export

• KT-68887 ObjCExport: K1 text fixture [@Deprecated](https://github.com/Deprecated) support
• KT-68841 ObjCExport: [@Deprecated](https://github.com/Deprecated) support
• KT-68826 ObjCExport: SerializersModuleBuilder

Tools. Gradle

New Features

• KT-68651 Compose: provide a single place in extension to configure all compose flags

Performance Improvements

• KT-61861 Gradle: Kotlin compilations depend on packed artifacts

Fixes

• KT-69330 KotlinCompile friendPathsSet property is racy due causing build cache invalidation
• KT-69444 Don't warn about missing Compose Compiler Gradle plugin in some cases
• KT-65271 Gradle: "Mutating dependency DefaultExternalModuleDependency after it has been finalized has been deprecated " with gradle 8.6-rc-3
• KT-69026 Mark AGP 8.5.0 as compatible with KGP
• KT-67822 Deprecate JVM history files based incremental compilation
• KT-67771 Compatibility with Gradle 8.8 release
• KT-65820 Compatibility with Gradle 8.7 release
• KT-64378 Compatibility with Gradle 8.6 release
• KT-68661 Move ExperimentalWasmDsl to kotlin-gradle-plugin-annotations
• KT-69291 Compose Gradle plugin: Enable strong skipping by default
• KT-65528 Migrate rest of Gradle integration tests to new Test DSL
• KT-68306 Project isolation for FUS statistics: Cannot access project ':' from project ':app' at org.jetbrains.kotlin.gradle.report.BuildMetricsService$ Companion.initBuildScanExtensionHolder
• KT-67395 Add new plugins to collector kotlin gradle performance
• KT-67766 Build against Gradle API 8.7
• KT-67890 Compile against Gradle 8.8 API artifact
• KT-68773 Kotlin 2.0.0 with Gradle 8.8: ConcurrentModificationException on BuildFusService configurationMetrics
• KT-67889 Run tests against Gradle 8.8 release
• KT-69078 Gradle: Add option to disable FUS Service
• KT-68308 Project isolation for FUS statistics: An error is thrown at org.gradle.configurationcache.ProblemReportingCrossProjectModelAccess$ProblemReportingProject.getLayout
• KT-58280 org.jetbrains.kotlin.jvm Gradle plugin contributes build directories to the test compile classpath

Tools. Gradle. Kapt

• KT-61928 Clarify parameter types in KaptArguments and KaptJavacOption

Tools. Gradle. Multiplatform

• KT-69310 w: KLIB resolver: The same 'unique_name=...' found in more than one library for diamond source set structures
• KT-66568 w: KLIB resolver: The same 'unique_name=...' found in more than one library
• KT-69406 Deprecate combinations of KMP plugin with some Gradle Java plugins
• KT-66209 Accessing the source sets by name is confusing
• KT-56566 Consider pre-generating DSL accessors for source sets with names corresponding to the default target hierarchy
• KT-69129 KGP: stdlib version alignment for JS and Wasm
• KT-62368 Kotlin 1.9.X fails to detect kotlin.test.Test annotation reference on commonTest source set when targeting JVM+Android
• KT-67110 Usage of BuildOperationExecutor.getCurrentOpeartion internal Gradle API
• KT-68248 kotlin multiplatform project fail to build on Fedora with corretto

Tools. Gradle. Native

• KT-68638 KGP 2.0 breaks native test with api dependencies and configuration cache

Tools. Kapt

• KT-68171 K2KAPT: boxed return types in overridden methods changed to primitives
• KT-68145 K2 KAPT: missing $annotations methods for const properties and private properties without accessors

Tools. Scripts

• KT-69296 scripting dependency resolution does not authenticate towards maven mirrors
• KT-68681 K2 / CLI / Script: "NullPointerException: getService(...) must not be null" caused by [@DependsOn](https://github.com/DependsOn)

Tools. Wasm

• KT-69245 K/Wasm: Remove warning of working-in-progress
• KT-69154 K/Wasm: wasmJsBrowserProductionRun flaky crash with "WebAssembly.instantiate(): Import ... function import requires a callable"
• KT-67980 Wasm: Incorrect "Please choose a JavaScript environment to build distributions and run tests" when WASM is not configured