org.jetbrains.kotlin:kotlin-build-statistics

Changelog

Analysis. API

Performance Improvements

• KT-64987 Analysis API: 50GB memory allocation on creating empty kotlinx.collections.immutable.persistentMapOf

Fixes

• KT-65268 K2: Checking the presence of the delegated constructor call forces AST loading
• KT-63330 Analysis API: Stub-based deserialized symbol providers provide unresolved enum entry annotation arguments
• KT-65418 Analysis API: LLFirAbstractSessionFactory loads anchor module sessions eagerly
• KT-64718 Analysis API: do not expose SealedClassInheritorsProvider and FirRegularClass to IDE Plugin
• KT-65075 K2: getContainingDeclaration() is broken for declarations inside code fragments
• KT-61332 Support KtTypeCodeFragment in PsiRawFirBuilder
• KT-65150 AA: incorrect result from KtTypeProvider#getReceiverTypeForDoubleColonExpression for Java static method
• KT-55750 LL FIR: Implement multi-threaded resolve
• KT-56551 LL FIR: implement parallel resolve for jumping phases
• KT-65223 Psi: avoid KtFile usages
• KT-65307 Analysis API FE10: support KtFe10AnalysisSessionProvider.getAnalysisSessionByUseSiteKtModule
• KT-62695 K2 IDE: Unresolved extension functions in KDoc
• KT-65152 Analysis API: KDoc references to packages are not fully resolved
• KT-64988 K2 IDE: Navigation from the named argument in safe call does not work
• KT-64074 K2: Investigate LL divergence for Script.testTopLevelPropertyInitialization
• KT-64921 K2 IDE: references in platform code resolve to expect classifier instead of actual
• KT-62441 K2: IDE K2: "No dangling modifier found"
• KT-64528 K2 IDE: MPP: unregistered component 'org.jetbrains.kotlin.fir.scopes.impl.FirDelegatedMembersFilter'
• KT-64993 Analysis API: KtExpressionTypeProvider.getExpectedType works incorrectly for arguments of safe calls
• KT-64883 Allow direct creation of KtCommonFile
• KT-64646 K2: properly forbid ast loading during raw fir phase in tests
• KT-64862 Psi: missed parenthesis in type reference presentation
• KT-62893 K2 IDE. FP 'when' expression must be exhaustive with Java sealed interface from library
• KT-63795 K2: lazyResolveToPhase(BODY_RESOLVE) cannot be called from a transformer with a phase BODY_RESOLVE from SealedClassInheritorsProviderIdeImpl

Analysis. Light Classes

• KT-65425 K2 IDE: Seeing a reference to the class generated by compiler plugin exposed from Java code caused NPE from light classes
• KT-64937 SLC: internal setters are not mangled

Apple Ecosystem

• KT-63212 podInstall task fails without a proper diagnostic when xcodeproj gem is outdated

Backend. Wasm

• KT-63939 Kotlin/Wasm Support lazy associated object initialisation
• KT-64803 K/Wasm: non-capturing lambdas are not singleton unlike same lambdas in jvm
• KT-64449 K2: Implement K1WasmWasiCodegenBoxTestGenerated for K2
• KT-64829 K/Wasm: division remainder has a wrong sign
• KT-65009 Generate TypeScript definitions for the @JsExport declarations in K/Wasm

Compiler

New Features

• KT-63670 Implement platform specific declaration clash diagnostics across all backends
• KT-62547 Introduce a language feature flag for smartcasts based on "memory" variables

Fixes

• KT-63344 K2: False positive ABSTRACT_CLASS_MEMBER_NOT_IMPLEMENTED
• KT-58845 K2: SAM checker can run incorrectly in presence of an expect supertype
• KT-61843 K2: Missing TYPE_MISMATCH for nested array literals
• KT-61798 K2 incorrectly calculates modality of property accessors
• KT-65255 K2 / KJS: "IllegalArgumentException: Candidate is not successful, but system has no contradiction"
• KT-65341 K2: "Cannot find cached type parameter by FIR symbol" caused by not-null assertion operator inside string in throw
• KT-49283 Support contribution type info from a nested builder inference call
• KT-64077 K2: Builder inference ignores constraints from nested builder inference
• KT-49160 Couldn't infer a type argument through several builder inference calls broken by a local class
• KT-61310 K2: "Not enough information to infer type variable R" for transformLatest
• KT-63733 Builder-style type inference can't resolve to extension overloads when they're more applicable than member ones
• KT-57707 K1: inconsistent TYPE_MISMATCH in builder inference
• KT-55057 Builder inference changes behaviour sporadically based on BI annotation on unrelated call
• KT-60663 Builder inference does not work inside a nested unrelated builder inference lambda
• KT-53639 TYPE_MISMATCH: compiler can't infer the list's type when using buildList {} builder or Collection#isNotEmpty
• KT-60291 K2: "IllegalStateException: Cannot serialize error type: ERROR CLASS: Cannot infer argument for type parameter T" during FIR serialization
• KT-65033 K2: Fir2LazyIr: Lazy type aliases not supported
• KT-57709 Inconsistent extension function call resolution in builder inference
• KT-53740 Builder inference with multiple lambdas leads to unsound type
• KT-60877 Builder inference from the null literal results in Nothing instead of Nothing? for producing positions of the postponed type variable
• KT-53553 Builder inference: inconsistent types in different lambda scopes
• KT-54400 K2: builder inference does not work with assignments of literals to member properties
• KT-53109 CompilationErrorException generateUnboundSymbolsAsDependencies with builder inference and lambdas
• KT-52757 Type inference for builders fails if inferred from a function
• KT-63840 Builder inference fails on calls to identity-shaped functions with postponed type variables inside select-constructions
• KT-64276 [K/N][K2] K2 behaviorial difference with inconsistent inheritance of ObjCName
• KT-59782 K2: Forbid local delegated properties with private accessors in public inline functions
• KT-65482 K2: NoSuchFieldError due to using unboxed type
• KT-63208 K2: Implement deprecation cycle and fix missing errors for error-level nullable arguments of warning-level Java types
• KT-64891 K2: consider supporting/forbidding foo.(bar)() syntax
• KT-62134 K2: handle non-simple types during FirStatusResolver.isPrivateToThis check
• KT-65290 K2: No override for FUN DEFAULT_PROPERTY_ACCESSOR
• KT-65111 K2: Java star imports don't work in KJK interdependencies
• KT-59012 K2: Support inferring types based on self upper bounds
• KT-65373 K2: there is a crash in KJK hierarchy with an extension member property
• KT-65277 IrFakeOverrideBuilder: NPE from IrJavaIncompatibilityRulesOverridabilityCondition.doesJavaOverrideHaveIncompatibleValueParameterKinds
• KT-62884 K2: different signature of delegate object for generic extension property
• KT-59630 K2: Implement running FIR Blackbox tests on different JDKs
• KT-64944 Can't assign null after early return smart cast with typed destructive assignment
• KT-64910 K2: AA FIR: KtCall's argument mapping misses SAM conversion argument
• KT-64846 K2: false negative CONFLICTING_JVM_DECLARATIONS on inheritance from Java collection subclass with a conflicting override
• KT-60732 K2 Scripting: TeamCity DSL test
• KT-65165 K2: "ClassCastException: class java.lang.String cannot be cast to class SampleClass"
• KT-64982 K2: false negative FUNCTION_CALL_EXPECTED
• KT-64872 K2: do-while condition able to access uninitialized variable
• KT-65318 K2: Substitution stackoverflow on jspecify @NullMarked superclass
• KT-65010 Kotlin/Native: code generation for a static field is failing
• KT-59921 K2: Disappeared NULL_FOR_NONNULL_TYPE
• KT-57299 K2: VerifyError due to overriding final method size on a subclass of Collection and Set
• KT-57300 K2: subclass of MutableCollection with primitive element type has methods with boxed type
• KT-58279 K2. False-negative Smart cast to is impossible, because is a public API property declared in different module for Java static field
• KT-64706 K2: Type inference cannot resolve nullable @Composable lambda
• KT-65058 K2: Protected function call from public-API inline function is prohibited in anonymous object
• KT-53629 K2: forbid multiple labels per statement
• KT-65316 K2: False positive USAGE_IS_NOT_INLINABLE for expression labeled with illegal label
• KT-57268 K2: extra methods remove and/or getOrDefault are generated for Map subclasses with JDK 1.6 in dependencies
• KT-63151 K2: Assignment within function lambda should invalidate contract DFA implications
• KT-63351 K2. No smart cast with not-null assertion operator after a safe call
• KT-65324 atomicfu-plugin: top-level delegated properties cause NPE
• KT-60246 K2: origin is not set for getting array element operator
• KT-64387 K2: Missing POSTFIX_INC/DEC origin for array element inc/dec
• KT-61891 K2: POSTFIX_{INCR|DECR} of global misses an origin
• KT-65019 K2: unexpected exception when executing inc/dec in finally block on WASM
• KT-64392 Factor out KLIB serialization logic from the backend.native module
• KT-65270 K2: Missing ACTUAL_WITHOUT_EXPECT when expect is fake-override
• KT-60367 K2: Support EXPECT_AND_ACTUAL_IN_THE_SAME_MODULE diagnostics
• KT-62704 Absent testrunner FirLightTreeDiagnosticTestSpecGenerated
• KT-65044 K2 compiler crash on unresolved delegated extention receiver
• KT-65021 K2: Missing error and miscompilation in destructuring declaration delegation
• KT-63899 K2: Vararg parameter misses annotation in metadata
• KT-60175 JVM IR inline: accidental reification of typeOf type argument
• KT-60174 JVM IR inline: accidental reification in various cases
• KT-65103 K2: IllegalArgumentException: IrErrorCallExpressionImpl(5388, 5392, "Unresolved reference: R?C|<local>/cont|") found but error code is not allowed
• KT-64635 K2: "KotlinIllegalArgumentExceptionWithAttachments: Expected expression 'FirAnonymousFunctionExpressionImpl' to be resolved" when provideDelegate is extension of function with receiver
• KT-63434 K2. False positive Cannot access with protected nested classifiers references inside anonymous object inherited from containing class
• KT-64314 K2: Rename FirConstExpression to FirLiteralExpression
• KT-63577 K2: false-positive "wrong number of type arguments" error on callable reference to member of generic function's local class
• KT-64975 FIR: Deserialize enum entry annotation arguments from binary libraries with lookup tags instead of symbols
• KT-61626 K2: Module "com.soywiz.korlibs.kmem:kmem" has a reference to symbol korlibs.memory/Buffer|null[1]
• KT-64268 K2: Data-flow from nested lambda not passed to outer lambda
• KT-59729 K2: Investigate CFG buildings for inner lambdas in case of double-lambda builder inference
• KT-64841 K2: argument type mismatch with type parameter with recursive bound
• KT-62554 K2: incorrect "inherits multiple implementations" error when base Java method takes a parameter of primitive wrapper type
• KT-65093 K2: Super constructor call able to access uninitialized object fields
• KT-56489 K2 allows reading uninitialized variable in object declaration
• KT-59987 K2: Disappeared REIFIED_TYPE_FORBIDDEN_SUBSTITUTION
• KT-36786 Smartcast doesn't work in case of property infix call
• KT-65056 IrFakeOverrideBuilder: ISE "No override for FUN" on package-private Java method in K-J-K hierarchy
• KT-62045 IrFakeOverrideBuilder: incorrectly merged fake overrides for Java methods accepting wrapper Double and primitive double
• KT-57640 [K2/N] Investigate behaviour for intersection overrides for properties that have incompatible types
• KT-59682 K2: Use proper source for vararg arguments
• KT-63781 K2: Generated blocks appear in the IR
• KT-63779 K2: Regression for locations of 'if' statements
• KT-63624 K2: incompatible declaration because of different visibility
• KT-64400 K2: allow to use simple boolean expressions as constants
• KT-59972 K2: Disappeared EXPRESSION_EXPECTED_PACKAGE_FOUND
• KT-63256 K2: NOT_IDENTITY operator call is illegal in contract description
• KT-63529 K2: Compiler does not detect tailrec call with nullable type
• KT-65012 IR Evaluator: NoSuchFieldException when evaluating protected/private fields of superclasses
• KT-64871 IrFakeOverrideBuilder: ISE "no override for <get-size>" on HashMap subclass
• KT-60262 Support for inter-module interaction for @SubclassOptInRequired
• KT-58739 K2: Rewrite CallableId.classId to be thread-safe
• KT-64979 K2: Missing REDUNDANT_TYPE_PARCELER when using type alias
• KT-60019 K2: Introduced PARCELER_TYPE_INCOMPATIBLE
• KT-62500 K2: origin=GET_PROPERTY is wrongly set to GET_FIELD of backing field inside property's own getter
• KT-64743 K2: Non-expanded type serialized in metadata
• KT-64405 K2: Implement CompileJavaAgainstKotlinTestGenerated for K2
• KT-64837 K2: NPE in fir2ir when generic transitive dependency class is missing
• KT-60258 Support java-kotlin interop for @SubclassOptInRequired
• KT-60260 K2: Implicit coercion to unit is not generated in adapted function reference
• KT-60858 Remove redundant createDeprecatedAnnotation necessary to workaround kotlinx-serialization compilation with native
• KT-64432 Unbound symbol access in Fir2Ir fake override builder
• KT-64466 K2: Delegated method annotations are not copied in IR
• KT-63589 K1: Unsound type inference for unbound callable reference to star-projected class's generic mutable property
• KT-61032 K2: False positive “Unused variable” for function callable reference
• KT-64832 K2: False positive "Unused variable" checker report on suspend functional types, on overloaded functional types and on custom invoke operator types
• KT-64609 K2: INAPPLICABLE_TARGET_PROPERTY_IMMUTABLE diagnostic is missed for primary constructor properties
• KT-61937 K2: implicit script receiver from ScriptDefinition are not visible for invoke
• KT-27936 Write InnerClasses attribute for all class names used in a class file
• KT-31367 IllegalStateException: Concrete fake override public open fun (...) defined in TheIssue[PropertyGetterDescriptorImpl@1a03c376] should have exactly one concrete super-declaration: []

Docs & Examples

• KT-63001 K2: Organize team-wide talks about new FIR2IR & PCLA

IR. Actualizer

• KT-65274 IrFakeOverrideBuilder: ISE: "IrFieldPublicSymbolImpl is already bound"
• KT-65236 IrFakeOverrideBuilder: ISE: "should not be called"
• KT-65116 K2: IrFakeOverrideBuilder: "No override for FUN" if the function has already been overridden by another class in K <- J<- K <- J hierarchy
• KT-65499 IrFakeOverrideBuilder: ISE IrSimpleFunctionPublicSymbolImpl is already bound for irrelevant 'remove' clashing with a function from Java collection subclass
• KT-64150 IrFakeOverrideBuilder: Fake overrides for static java functions are not generated
• KT-65432 IrFakeOverrideBuilder - No override for FUN IR_EXTERNAL_JAVA_DECLARATION_STUB name:elementData
• KT-64895 K2:IrActualizer corrupts attributeOwnerId value

IR. Inlining

• KT-64868 [K/N] Inlined assert is later not removed, even without -ea

IR. Tree

• KT-64974 Consolidate visibility checks in IrFakeOverrideBuilder

JavaScript

• KT-34995 JS: List, Map, and Set types are hard to use from JS because of mangled member names
• KT-64548 KJS / K2: "Cannot find delegated constructor call" caused by external classes constructors
• KT-63359 K2: support new ways to declare TestResult in JS TestGenerator lowering
• KT-44871 Add @JsExport and @JsName annotations to stdlib classes (especially collections) to avoid method name mangling and improve Kotlin usability from JS
• KT-64867 K2 JS: Name clash between constructors with same JsName but in different classes
• KT-64463 KJS / K2: "Name contains illegal chars that cannot appear in JavaScript identifier" caused by non-ASCII character
• KT-65168 Introduce an ability to create type-safe JS objects

KMM Plugin

• KT-59270 Update wizards in KMM AS plugin after 1.9.20 release

Klibs

• KT-65063 Clashing KLIB signatures from different modules result in an exception
• KT-61143 [klib tool] Dump IR with unbound symbols

Language Design

• KT-58881 K2: Run checkers in common code against platform session
• KT-64187 K2: False positive ABSTRACT_NOT_IMPLEMENTED caused by the fact that common code sees platform code of its dependencies
• KT-62959 Value of captured type is not a subtype of the same captured type
• KT-64739 Mark @SubclassOptInRequired as an experimental

Libraries

• KT-63397 kotlin-test should declare runtime dependency on "org.junit.platform:junit-platform-launcher"
• KT-65242 Update transitive dependencies of JVM test frameworks in kotlin-test
• KT-63355 Detect concurrent modifications in ArrayDeque
• KT-57150 Consider introducing Common protected property AbstractMutableList.modCount
• KT-64956 Implement optimized removeRange for ArrayDeque
• KT-57151 Consider introducing Common protected function AbstractMutableList.removeRange
• KT-58039 Wasm: Implement unsigned numbers using wasm builtin capabilities
• KT-63714 K2: kotlinx-benchmarks fails with "Unable to find method ''org.gradle.api.tasks.TaskProvider" with register("js")

Native

• KT-64249 Native: Implicit cache directory search is O(n^2)

Native. C and ObjC Import

• KT-64105 [K2/N] cannot access Objective-C forward declared class used only in a dependent lib

Native. Runtime

• KT-65170 Kotlin/Native: deprecate -Xworker-exception-handling=legacy with error

Native. Runtime. Memory

• KT-63423 Kotlin/Native: huge dispose-on-main overhead
• KT-64313 Kotlin Native: Seg Fault during Garbage Collection on 1.9.21 (observed on iOS)

Reflection

• KT-57972 Reflection: "KotlinReflectionInternalError" when using callBy with overridden function in inline class

Tools. CLI

• KT-64608 K2: Wrong end position of compiler diagnostics

Tools. Commonizer

• KT-64376 Commonizer incorrectly retains UnsafeNumber annotation in target sets where it shouldn't

Tools. Compiler Plugins

• KT-64591 Data class' copy method is never stripped from ABI
• KT-59074 K2: false-positive MUST_BE_INITIALIZED_OR_FINAL_OR_ABSTRACT if allOpen plugin is used and a val is defined with init {} block
• KT-64589 jvm-abi-gen: Order of class members affects ABI jar
• KT-65072 jvm-abi-gen: SourceDebugExtension annotation isn't stripped along with corresponding attribute
• KT-64971 Exception is thrown when compiling kotlinx.coroutines to Native because of the new signature clash diagnostics
• KT-54025 [K2] [NONE_APPLICABLE] compiler error in case @ AllArgConstructor annotation is used together with a static field
• KT-54054 [Lombok] An extra unneeded constructor parameter is expected by compiler if java class annotated with @ AllArgsConstructor and has private final initialized field

Tools. Daemon

• KT-64283 Configure correct JVM arguments when starting the daemon

Tools. Fleet. ObjC Export

• KT-65108 ObjCExport: Tests: Check if 'requirePlatformLibs' is necessary
• KT-65281 ObjCExport: AA: Run already passing Unit Tests on CI
• KT-65080 ObjCExport: Analysis-Api: error handling
• KT-64952 ObjCExport: Analysis-Api: object
• KT-64869 ObjCExport: Analysis-Api: Support 'MustBeDocumented' annotations
• KT-64839 ObjCExport: Enable tests on CI for aggregate
• KT-64888 ObjCExport: Analysis Api: Support exporting KDoc

Tools. Gradle

• KT-62639 Compatibility with Gradle 8.4 release
• KT-65143 Use the new ConfigurationContainer dependencyScope method to create dependency declaration configurations
• KT-64848 Log K/Native compiler arguments with log level specified for compiler arguments
• KT-65213 Collect logic for FUS metrics calculation in one place
• KT-61698 Compiler options configured inside metadata {} target set up all targets in a project
• KT-59024 Compatibility with Gradle 8.3 release
• KT-60664 Gradle 8.3: KGP eagerly creates compile task

Tools. Gradle. JS

• KT-64119 K/JS: Migrate package manager from Yarn onto NPM
• KT-65295 Gradle: K/N and K/JS tests may produce unrequested TeamCity service messages

Tools. Gradle. Multiplatform

• KT-61943 Mark the checkKotlinGradlePluginConfigurationErrors as UP-TO-DATE when possible
• KT-61559 Include stdlib and platform dependencies to KotlinNativeCompilation.compileDependencyFiles API
• KT-65196 Add high-level DSL to configure compiler options in the multiplatform project
• KT-61430 K2/KMP: metadata compilation fails with Unresolved reference for property in actual class

Tools. Gradle. Native

• KT-49268 Only download Kotlin/Native Compiler when there are valid targets
• KT-52567 Use Gradle dependency management for downloading Kotlin/Native compiler when compiling with Gradle
• KT-64903 Add maven repo with dev versions into IT
• KT-51255 Kotlin/Native should not download compiler artifacts when not necessary
• KT-58303 Kotlin multiplatform Gradle plugin downloads Kotlin/Native compiler during configuration

Tools. JPS

• KT-65043 JPS dumb mode should respect maps needed for the compiler

Tools. Kapt

• KT-65684 KAPT: (Re)enable fallback to K1 KAPT and make it default
• KT-61080 Kapt: investigate suspicious check for KMutableMap.Entry in KaptTreeMaker
• KT-64479 Kapt4 + Compose. Error: scoping construct cannot be annotated with type-use annotation: @androidx.compose.runtime.Composable

Tools. Wasm

• KT-64851 Wasm. Support Gradle configuration cache

Changelog

Analysis. API

Fixes

• KT-62895 K2 IDE. FP 'when' expression must be exhaustive with sealed interface from library
• KT-64805 Analysis API: introduce common entry point for multi-file test cases
• KT-64714 K2: Analysis API: CollectionsKt.map doesn't resolves from Java in kotlin repo
• KT-64647 K2: Allow to calculate decompiled inheritors for sealed classes in tests
• KT-64595 AA: stackoverflow while simplifying a type with a recursive type parameter
• KT-64825 Analysis API. Cannot compute containing PSI for unknown source kind 'org.jetbrains.kotlin.KtFakeSourceElementKind$DefaultAccessor' exception on getContainingSymbol call for default setter parameter
• KT-64080 K2: Analysis API: On-air resolve does not trigger resolution of delegated super call arguments
• KT-64243 K2: proper lazy resolution for fake overrides
• KT-62891 K2 IDE. FP [EXPOSED_FUNCTION_RETURN_TYPE] on overriding library method which returns protected type
• KT-61890 Analysis API: Migrate KtFirScopeProvider to ContextCollector instead of onAirResolve
• KT-64197 K2: Code fragments are only supported in JVM
• KT-64604 K2: IDE K2: "Modules are inconsistent during performance tests"
• KT-62357 K2 IDE. False positive on generated component methods and false negative on getter of @JvmRecord classes in Java
• KT-62892 K2 IDE. Java outer class from other module is not resolved when nested class is accessed with fq name in a type position
• KT-62888 K2 IDE. IDE infers reference to KMutableProperty as reference to just KProperty
• KT-64584 K2: StubBasedFirDeserializedSymbolProvider: support deserialization of delegated declarations
• KT-60324 K2 IDE: "NoSuchElementException: List is empty at JavaOverrideChecker#buildErasure"
• KT-62896 K2 IDE. FP ABSTRACT_MEMBER_NOT_IMPLEMENTED on inheriting class from library which implements interface by delegation
• KT-62947 Analysis API: Error while resolving FirPropertyImpl
• KT-64468 Analysis API: Implement mixed multi-module tests which support different kinds of KtModules
• KT-63547 K2 IDE. False Positive AMBIGUOUS_ANNOTATION_ARGUMENT
• KT-62832 K2: ClassCastException: FirDeclarationStatusImpl cannot be cast to FirResolvedDeclarationStatus
• KT-64205 Analysis API: Do not import non-top-level callables by default
• KT-63056 K2: Cannot mutate an immutable ImplicitReceiverValue on FirCodeFragment analysis
• KT-64108 K2: KtFirSymbolDeclarationOverridesProvider shouldn't provide fake overrides
• KT-63752 K2: java.lang.StackOverflowError FirFieldSymbol.getHasInitializer
• KT-63718 Analysis API: Stub-based dependency symbol providers of library source sessions compute the wrong package name sets
• KT-64186 Analysis API: ContextCollector provides incorrect scopes for anonymous objects
• KT-63979 K2 IDE: presentation of types in completion is too verbose
• KT-63681 K2: LL FIR: Improve isResolved check coverage of after lazy resolution

Analysis. Light Classes

• KT-63087 K2 IDE: in .java source reference to JvmName names on unsigned type / value class are unresolved
• KT-64605 K2 IDE: usage of @Repeatable annotation in Java: false positive "Duplicate annotation"
• KT-64795 SLC: distinguish last v.s. non-last vararg value parameter type during binary resolution
• KT-61605 K2 IDE: Light elements do not obey platform contracts
• KT-57536 SLC: no need to populate members with expect modifier
• KT-63949 K2 IDE. Analyze hang on @Autowired constructor analysis
• KT-64320 Decouple kotlin psi from java PSI
• KT-64282 Decouple KotlinIconProviderService from java PSI

Apple Ecosystem

• KT-63821 Copy framework to BUILT_PRODUCTS_DIR in the embedAndSign task

Backend. Wasm

• KT-58852 WASM: two methods with different varargs: Class korlibs.template.dynamic.DynamicShape has 2 methods with the same signature [register(kotlin.Array<T of kotlin.Array>)

Compiler

New Features

• KT-4113 Smart casts for properties to not-null functional types at invoke calls

Fixes

• KT-64261 K2 / WASM: Extension function with star projection throws "RuntimeError: unreachable"
• KT-64877 K2: PCLA doesn't allow infer types from value parameter having TV type
• KT-63932 K2/Native codegen test failures around builder inference
• KT-64222 K2: "return type is not a subtype of the return type of the overridden member"
• KT-57094 K1: wrong type inferred for an instance of a local class inside a generic property
• KT-62069 K2: ASSIGNMENT_TYPE_MISMATCH is reported in addition to NO_ELSE_IN_WHEN
• KT-62776 FirLazyResolveContractViolationException: "lazyResolveToPhase(STATUS) cannot be called from a transformer with a phase TYPES" on Java annotation usage
• KT-60056 K2: Introduced UNRESOLVED_REFERENCE
• KT-59791 K2: Implement partially constrained lambda analysis
• KT-42020 Psi2ir: IllegalStateException: "IrSimpleFunctionPublicSymbolImpl for public [...] is already bound" on generic function whose substitution leads to IdSignature clash
• KT-64771 Investigate subtle FIR_DUMP difference for reversed order analysis
• KT-62584 K2: different signature in subclass of local class declared in extension value getter
• KT-64615 Inconsistent error messages for platform type nullability assertions
• KT-59938 K2: Disappeared AMBIGUOUS_ACTUALS
• KT-64501 K2: False-positive WRONG_INVOCATION_KIND when using default arguments
• KT-64640 Prevent mutating SequenceCollection methods from JDK 21 be available on read-only collections
• KT-63644 K2: Create special IR symbols for fake-overrides in fir2ir in mode with IR f/o generator
• KT-62476 K2: Enable building fake overrides by ir on non-JVM targets
• KT-63638 K2: Compiler crashes with "Inline class types should have the same representation"
• KT-36220 NI: false positive NON_APPLICABLE_CALL_FOR_BUILDER_INFERENCE if one use cannot resolve
• KT-64121 K2: Actual modifier is missed on override fun toString() fro value class in native
• KT-63703 K2: Eliminate call to Candidate.usesSAM and samResolver.getFunctionTypeForPossibleSamType in AbstractConeCallConflictResolver.toTypeWithConversion
• KT-64435 K2: FIR2IR: Source offsets for data class members are inconsistent with PSI2IR
• KT-64090 K2: false-positive new inference error on invoking from another module a generic function on Java list type with wildcard type argument bounded by raw-typed Java inner class
• KT-64044 K2: Java mapped method should have a source from Java method, not from mapped Kotlin source class
• KT-46674 ClassCastException with smartcast if plus operator returns a different type
• KT-59369 K2: Missing BUILDER_INFERENCE_STUB_RECEIVER
• KT-64644 K2: Compiler crash in FirTypeParameterBoundsChecker
• KT-64312 K2: FirPropertySymbol.hasBackingField() always returns true for properties from other modules
• KT-64420 K2: Wrong module descriptor for builtin classes
• KT-64127 K2: incorrect resolution of inherited members on Java classes inheriting classes from different packages in the presence of identically named classes in the same packages
• KT-63446 IrFakeOverrideBuilder: AbstractMethodError due to missing bridge for generic method in a Java superclass
• KT-63441 IrFakeOverrideBuilder: "accidental override" when implementing a Java function taking an array parameter
• KT-63867 K2: Smartcast is allowed inside changing lambda with cycles
• KT-63414 K2 / Contracts: false positive "Result has wrong invocation kind" when invoking a function returning a value with contract InvocationKind.EXACTLY_ONCE and try/finally
• KT-63777 K2: Smartcast is allowed inside changing lambda with bounds
• KT-64059 K2: CYCLIC_INHERITANCE_HIERARCHY while using nested annotation in an outer class declaration
• KT-63528 K2: Missing UNNECESSARY_SAFE_CALL for warning level annotated java declarations
• KT-64607 K2: extension functions on UInt and Number lead to JVM ClassCastException
• KT-62816 K2: Annotation use site targets printing could be improved in diagnostics' messages
• KT-62815 K2: FIR renderings leak through some diagnostics' message
• KT-35289 Confusing warning message "Duplicate label in when"
• KT-49084 Contracts: error message is unclear
• KT-63228 K2: Upper bound violation diagnostic renders compiler internals about SourceAttribute
• KT-62386 K2: Proofread quotes in diagnostic messages
• KT-64081 K2: Incorrect smartcast candidate calculation in MemberScopeTowerLevel
• KT-63994 K2: Investigate K2 failures in IntelliJ-Rust plugin
• KT-58767 Inheritance opt-in enforcement via @SubclassOptInRequired can be avoided with type aliases
• KT-63941 K2: "IllegalStateException: Unsupported compile-time value STRING_CONCATENATION" caused by class reference in string expression as annotation parameter
• KT-59818 K2: Explore the TODO about suspend functions overridden in Java in FirHelpers
• KT-63233 K2 : false negative Class is not abstract and does not implement abstract member with abstract suspend function
• KT-63379 K2. Argument type mismatch on creating functional interface instance with function literal as an argument with in type projection
• KT-64308 K2: prefer call with Unit conversion at lower level to one without Unit conversion at upper level
• KT-64307 K2: prefer function with default arguments at lower level to one without them at upper level during callable reference resolve
• KT-64306 K2: prefer SAM at lower level to a functional type at upper level
• KT-63827 K2: Array += desugaring doesn't have origin
• KT-64341 Kotlin/JVM: Missing line number generation for intrinsic comparisons
• KT-64238 Add proper documentation to the IdeCodegenSettings class
• KT-63667 K2/KMP: exception when expect property matched to java field
• KT-63563 K2: False negative RETURN_TYPE_MISMATCH with empty return
• KT-62525 K2: IllegalStateException: Can't find KotlinType in IrErrorType: IrErrorType(null)
• KT-57427 Fix inconsistencies in name manglers that use different declaration representations
• KT-57755 K2/JVM: Fix computing a "signature" mangled name for the main function
• KT-63645 K2: Replace special f/o symbols with normal ones after actualization
• KT-63076 K2: change in behavior for synthetic properties in Kotlin-Java hierarchy
• KT-63723 Frontend manglers improperly handle error type
• KT-63738 K2: Some declarations are missing in the hierarchy of overridden symbols
• KT-62242 K2: Uniformly treat enum entries as anonymous objects
• KT-62281 K2: build DuckDuckGo Android user project and pass it to CI
• KT-60266 K2: origin is not set for FOR_LOOP_ITERATOR
• KT-59875 K2: Disappeared UNRESOLVED_REFERENCE_WRONG_RECEIVER
• KT-62715 K2: Missing WASM_IMPORT_EXPORT_UNSUPPORTED_PARAMETER_TYPE
• KT-62723 K2: Missing WASM_IMPORT_ON_NON_EXTERNAL_DECLARATION
• KT-62722 K2: Missing NESTED_WASM_IMPORT
• KT-62721 K2: Missing WASM_EXPORT_ON_EXTERNAL_DECLARATION
• KT-62720 K2: Missing JS_AND_WASM_EXPORTS_ON_SAME_DECLARATION
• KT-62719 K2: Missing NESTED_WASM_EXPORT
• KT-62718 K2: Missing WASM_IMPORT_EXPORT_UNSUPPORTED_RETURN_TYPE
• KT-62717 K2: Missing WASM_IMPORT_EXPORT_PARAMETER_DEFAULT_VALUE
• KT-62716 K2: Missing WASM_IMPORT_EXPORT_VARARG_PARAMETER
• KT-60225 K2: compiler FIR symbol resolution crash on a call to an extension function whose receiver contains a type parameter with a recursive upper bound
• KT-63530 K2: Disable passing data flow info from in-place lambdas
• KT-60958 K2: smart cast does not work with definite return from if block
• KT-60090 K2: Introduced DEPRECATED_PARCELER
• KT-59949 K2: Disappeared DEPRECATED_PARCELER
• KT-61768 Wrong bytecode index in LineNumberTable when there is an incremental operation
• KT-64045 K2: "Expect declaration * is incompatible with actual" when function parameter names are different
• KT-62018 K2: prohibit suspend-marked anonymous function declarations in statement positions
• KT-63973 K2: "NoSuchElementException: Array is empty" with vararg used within tail recursive function
• KT-63612 K2: Class is not abstract and does not implement abstract member
• KT-61792 KMP: Backend error on @Deprecated usage with DeprecationLevel.HIDDEN in K2
• KT-63709 K2: Argument smartcasting impacting receiver and call resolution for implicit invoke
• KT-57788 Fix computing mangled names of types with @EnhancedNullability from IR-based declaration descriptors
• KT-63249 K2: change in annotation resolve when ambiguous
• KT-63514 ISE “Inline class types should have the same representation: [I != I” during compilation on submitting UIntArray to vararg
• KT-62553 K2: Add topLevelClassifierPackageNames to symbol name providers
• KT-64148 K2: class cast exception org.jetbrains.kotlin.fir.types.ConeStarProjection
• KT-63665 K2: "NullPointerException" caused by class with the companion object and extra curly brace
• KT-59715 K2: Check behaviour of property + operator in operator position
• KT-62347 Prohibit using property+invoke convention for delegated properties
• KT-59421 K2: Missing CONTEXT_RECEIVERS_WITH_BACKING_FIELD
• KT-59903 K2: Disappeared DELEGATE_SPECIAL_FUNCTION_NONE_APPLICABLE
• KT-62926 K2: IR has missing receivers during expect-actual matching
• KT-62565 K2 cannot infer type parameters in case of expected functional type
• KT-63328 K2: Top-level properties in scripts can be used while uninitialized
• KT-59683 K2: Add control flow graph to FirScript
• KT-63524 K2: "Not enough information to infer type argument"
• KT-63835 K2: metadata compilation with constants is falling for Native
• KT-60251 K2: delegated method are delegating to different methods in hierarchy compared to K1
• KT-63695 JVM: Don't use plugin extensions when compiling code fragment
• KT-63574 K2: "IllegalStateException: IrFieldPublicSymbolImpl for java.nio/ByteOrder.LITTLE_ENDIAN"
• KT-60504 K2: difference between LL FIR and FIR in enhanced return type with annotation
• KT-64147 K2: Generate FIR diagnostics with explicit types
• KT-63042 K2: proper processing of propagated annotations
• KT-59368 K2: Missing SUBTYPING_BETWEEN_CONTEXT_RECEIVERS
• KT-64083 K2: "KotlinIllegalArgumentExceptionWithAttachments: Unexpected returnTypeRef. Expected is FirResolvedTypeRef, but was FirJavaTypeRef"
• KT-37308 No smart cast when the null check is performed on a child property through a function with a contract
• KT-59894 K2: Disappeared ANNOTATION_ARGUMENT_MUST_BE_CONST
• KT-63329 K2: difference in SAM-conversion casts generation
• KT-64062 K2 IDE. NPE on typing nullable parameter in return
• KT-58579 K2: false-positive new inference error on invoking a generic function on Java wildcard type bounded by raw-typed Java inner class
• KT-64031 K2: Revise naming in FirBuilderInferenceSession
• KT-50453 Improve builder inference diagnostics with type mismatch due to chosen inapplicable overload
• KT-56949 K2: Builder inference violates upper bound
• KT-63648 K2: values of postponed type variable don't introduce type constraints in extension receiver positions during builder-style type inference
• KT-64028 K2: Investigate questionable condition in FirBuilderInfernceSession
• KT-63848 ReflectiveAccessLowering does not count arguments of super-calls
• KT-61920 K2: False negative CONST_VAL_WITH_NON_CONST_INITIALIZER when initializer is Java field
• KT-63508 K2: "IllegalArgumentException: Not FirResolvedTypeRef (String) in storeResult" caused by @Deprecated Java function and typo
• KT-63522 K2: wrong context for delegated field type
• KT-53308 TYPE_MISMATCH: Contracts on boolean expression has no effect on referential equality to null
• KT-51160 Type mismatch with contracts on narrowing sealed hierarchy fail to smart cast
• KT-49696 Smart cast to non-null with inline non-modifying closures sometimes doesn't work
• KT-46586 SMARTCAST_IMPOSSIBLE when assigning value inside lambda instead of if expression
• KT-41728 False positive no smart cast with unreachable code after return in if expression
• KT-22904 Incorrect bytecode generated for withIndex iteration on Array<Int>

IR. Actualizer

• KT-58861 K2: Improve the new pipeline of FIR2IR conversion, IR actualization and fake-override generation
• KT-63347 K2: Fix overridden symbols inside LazyDeclarations
• KT-62535 K2: FakeOverrideRebuilder can't handle f/o without overridden symbols

JavaScript

• KT-61929 KJS: "IllegalStateException: No dispatch receiver parameter for FUN LOCAL_FUNCTION_FOR_LAMBDA" caused by run function in init block
• KT-64366 KJS / K2: Exported declaration uses non-exportable return type: 'kotlin.<X>?'
• KT-64426 K2: Implement JsIrLineNumberTestGenerated for K2
• KT-64422 K2: Implement IrJsSteppingTestGenerated for K2
• KT-64364 K2 / KJS: @JSExports generates clashing declarations for companion objects that extends its own class
• KT-63038 Compilation of suspend functions into ES2015 generators

Klibs

• KT-64085 Different klib signatures for K1/K2 for overridden properties assigned in init block
• KT-64395 API for ABI: Add a check for the file's existence to KLIB ABI Reader
• KT-63573 K2: Dependency problems with dependencies with same artifact id
• KT-64082 Different klib signatures in K1/K2 for the same locally used constant declaration
• KT-63931 [K/N] Relative path to klib option of cinterop tool doesn't work
• KT-60390 KLIBs: Wrong IrSymbol is used for deserialized expect property's backing field & accessors

Libraries

• KT-61969 Migrate kotlin-test to the current Kotlin Multiplatform Plugin
• KT-64361 Optimization opportunity in Int.sign
• KT-63157 Make sure that all deprecation levels are raised to ERROR for declarations intended for removal from kotlinx-metadata
• KT-64230 Prohibit writing versions of metadata that are too high

Native

• KT-61695 [K/N] Empty list error in FakeOverridesActualizer with K2
• KT-64508 IndexOutOfBoundsException in Konan StaticInitializersOptimization

Native. C and ObjC Import

• KT-63049 NPE in BackendChecker.visitDelegatingConstructorCall compiling ObjC-interop class
• KT-59597 [K\N] Usage of instancetype in block return type crashes

Native. ObjC Export

• KT-62091 KMP for iOS framework with private api : __NSCFBoolean
• KT-64076 ObjCExport: Do not retain descriptors in stubs
• KT-64168 ObjCExport: Split header generator module into K1 and Analysis Api
• KT-64227 ObjCExport: Extract Header Generation to base module

Native. Runtime. Memory

• KT-62689 Native: generate signposts for GC performance debugging

Native. Testing

• KT-64256 IR_DUMP directive doesn't enforce FIR_IDENTICAL when it is possible
• KT-62157 Native: Migrate FileCheck tests to new native test infra

Tools. CLI

• KT-64013 CLI REPL: "com.sun.jna.LastErrorException: [14] Bad address" on invoking kotlinc from CLI on ARM Mac

Tools. Compiler Plugin API

• KT-64444 K2: IrGeneratedDeclarationsRegistrar.addMetadataVisibleAnnotationsToElement doesn't work for declarations in common module

Tools. Compiler Plugins

• KT-33020 Support stripping debug information in the jvm-abi-gen plugin
• KT-64707 K2: Parcelize ignores @TypeParceler set for typealias

Tools. Compiler plugins. Serialization

• KT-64447 K2: Implement Serialization...IrBoxTestGenerated for K2
• KT-64124 Different klib signatures in K1/K2 for a serializable class

Tools. Gradle

• KT-64653 Add Kotlin DslMarker into Gradle plugin DSL
• KT-64251 KGP: Cannot re-use tooling model cache with Project Isolation due to "~/.gradle/kotlin-profile" changing
• KT-58768 Support configuration cache and project isolation for FUS statistics
• KT-64379 Remove kotlin.useK2 gradle property
• KT-62527 Gradle: get rid of the Project.buildDir usages
• KT-55322 Kotlin daemon: Cannot perform operation, requested state: Alive > actual: LastSession

Tools. Gradle. Cocoapods

• KT-57650 Gradle Cocoapods: use pod install --repo-update instead of pod install

Tools. Gradle. JS

• KT-64561 K/JS tests are not executed after upgrade to 1.9.22
• KT-63435 KJS: Get rid of deprecated outputFileProperty of Kotlin2JsCompile

Tools. Gradle. Multiplatform

• KT-56440 TCS: Gradle Sync: Add API to populate extras only during sync
• KT-63226 KGP Multiplatform Ide Dependency Resolution: Use gradle variants instead/in addition of ArtifactResolutionQuery

Tools. Gradle. Native

• KT-62745 iOS application build is failing if script sandboxing option is enabled in Xcode
• KT-62800 CInteropProcess should not require .def file to exist
• KT-62795 CInteropProcess task resolves cinterop def file eagerly, breaking Gradle task dependencies

Tools. Incremental Compile

• KT-63837 Implement baseline fix for common sources getting access to platform declarations
• KT-64513 Simplify adding configuration properties to incremental compilation
• KT-21534 IC doesn't recompile file with potential SAM-adapter usage
• KT-63839 Measure impact of rebuilding common sources, using nightly IC benchmarks
• KT-64228 K2: After switching to LV20 branch incremental tests are not running on PSI anymore
• KT-46743 Incremental compilation doesn't process usages of Java property in Kotlin code if getter is removed
• KT-60522 Incremental compilation doesn't process usages of Java property in Kotlin code if return type of getter changes

Tools. JPS

• KT-55393 JPS: Java synthetic properties incremental compilation is broken

Tools. Kapt

• KT-64719 K2 KAPT Stub genertaion doesn't fail on files with syntax errors
• KT-64680 Kapt: remove the flag to enable old JVM backend
• KT-64639 KAPT+JVM_IR: erased error types in JvmStatic and JvmOverloads
• KT-64389 K2 KAPT generates invalid code for multiple generic constraints
• KT-61776 K2: KAPT tasks fail with parallel gradle
• KT-64021 Kapt3 + Kapt4. NullPointerException: processingEnv must not be null
• KT-64303 K2 KAPT: Kapt doesn't dispose resources allocated by standalone analysis API
• KT-64301 K2 KAPT: Kapt doesn't report invalid enum value names to log
• KT-64297 K2 KAPT: Deprecated members are not marked with @java.lang.Deprecated

Tools. REPL

• KT-18355 REPL doesn't quit on the first line after pressing Ctrl+D or typing :quit

Changelog

Analysis. API

Fixes

• KT-62982 K2: Cannot get a PSI element for 'Enum.values'
• KT-59732 FirLazyResolveContractViolationException: lazyResolveToPhase(IMPORTS) cannot be called from a transformer with a phase IMPORTS from serialisation plugin
• KT-61757 K2 IDE: resolution to buitlins does not work for from common module
• KT-62676 K2 IDE: Reference shortener does not recoginize redundant this references
• KT-63627 K2 IDE: shorten reference shortens required qualifier
• KT-62675 K2 IDE: Reference shortener does not recoginize redundant labels
• KT-63771 fe10: KtNamedClassOrObjectSymbol#isInline does not cover value classes
• KT-62947 Analysis API: Error while resolving FirPropertyImpl
• KT-60327 K2 IDE. "IllegalArgumentException: source must not be null" during delegation declaration
• KT-63700 K2: "FirLazyExpression should be calculated before accessing" in the case of secondary constructor
• KT-62111 K2 IDE. IllegalArgumentException on for loop with iterator declaration attempt
• KT-63538 Analysis API: Removing a contract statement via PsiElement.delete() does not trigger an out-of-block modification
• KT-63694 K1/K2 IDE. "RuntimeException: Broken stub format, most likely version of kotlin.FILE (kotlin.FILE) was not updated after serialization changes" exception on incorrect class name
• KT-63560 Analysis API: Modifiable PSI tests cannot rely on the cached application environment to allow write access
• KT-62980 Implement KtFirSimpleNameReference#getImportAlias
• KT-63130 Analysis API: No receiver found for broken code during commit document
• KT-60170 K2 IDE: CCE from KtFirCallResolver on invalid code with wrong implicit invoke
• KT-61783 K2: Analyze 'KtCodeFragment' in a separate session
• KT-62010 K2: IDE K2: "ConeClassLikeTypeImpl is not resolved to symbol for on-error type"
• KT-62957 Analysis API: NullPointerException on call resolution when builtins are not available
• KT-62899 K2 IDE. IDE ignores @Suppress annotation for errors
• KT-62935 Analysis API: kotlin.Cloneable should not be available in Kotlin/Native sources
• KT-62910 Analysis API: create AbstractFirPsiNativeDiagnosticsTest for LL FIR
• KT-63096 K2: Analysis API: KotlinAnnotationsResolver for IDE is created with incorrect scope
• KT-63282 K2 Script: annotation arguments phase should resolve propagated annotations
• KT-63223 Analysis API: reference to declarations with kotlin* package are not resolved
• KT-63195 AA: incorrect results from KtTypeProvider#getReceiverTypeForDoubleColonExpression

Analysis. Light Classes

• KT-63552 Symbol Light Classes don't support arrayOf and similar without parameters in property initializers and default parameter values
• KT-63486 SLC: a lot of RAM is allocated in org.jetbrains.kotlin.asJava.LightClassUtil.isMangled

Backend. Wasm

• KT-62863 Execution failed for task ':kotlinx-serialization-properties:wasmJsD8Test' in serialization in the K2 QG

Compiler

New Features

• KT-22004 Allow to resolve CONFLICTING_OVERLOADS with Deprecated(HIDDEN)
• KT-61955 Support more wider actual member visibility, if the expect member is effectively final

Fixes

• KT-63695 JVM: Don't use plugin extensions when compiling code fragment
• KT-59903 K2: Disappeared DELEGATE_SPECIAL_FUNCTION_NONE_APPLICABLE
• KT-62961 K2 / KMP: NO_ACTUAL_CLASS_MEMBER_FOR_EXPECTED_CLASS with expect enum class and typealias
• KT-59369 K2: Missing BUILDER_INFERENCE_STUB_RECEIVER
• KT-53749 Support builder inference restriction in FIR
• KT-59390 K2: Missing BUILDER_INFERENCE_MULTI_LAMBDA_RESTRICTION
• KT-59887 K2: Disappeared ACTUAL_MISSING
• KT-62885 Introduce a language feature entry for expect actual classes for easier configuration of MPP projects
• KT-62589 K2: Investigate need of non-nullable IdSignature in Fir2IrLazyDeclarations
• KT-63329 K2: difference in SAM-conversion casts generation
• KT-64062 K2 IDE. NPE on typing nullable parameter in return
• KT-63761 K2: False positive "Unresolved reference" caused by object's parameter in enum class which is passed as annotation parameter
• KT-55252 Backend Internal error during psi2ir in native compile tasks (NPE in getKlibModuleOrigin)
• KT-50453 Improve builder inference diagnostics with type mismatch due to chosen inapplicable overload
• KT-56949 K2: Builder inference violates upper bound
• KT-64028 K2: Investigate questionable condition in FirBuilderInfernceSession
• KT-60031 K2: Introduced NO_ACTUAL_CLASS_MEMBER_FOR_EXPECTED_CLASS
• KT-63646 K2: "IllegalStateException: Return type of provideDelegate is expected to be one of the type variables of a candidate, but D was found"
• KT-59881 K2: Disappeared UNSUPPORTED
• KT-64136 K2: NSME with Anvil compiler plugin
• KT-63448 K2: CONFLICTING_INHERITED_JVM_DECLARATIONS with @JvmField
• KT-63865 K2: "IllegalArgumentException: Failed requirement." caused by lambda parameters with different type in init block
• KT-62609 K2. Type argument inference changed for object of Java class with several common parents
• KT-63081 Optimize new native caches: CachedLibraries.computeVersionedCacheDirectory()
• KT-63580 "AssertionError: access of const val: GET_FIELD" caused by const value and variable with delegation
• KT-63567 "NoSuchMethodError" on getting value of lazily initialized property by companion's const value
• KT-63540 Restrict the CONFLICTING_OVERLOADS + DeprecatedLevel.HIDDEN ignore to final callables
• KT-30369 Smartcasts from safe call + null check don't work if explicit true/false check is used
• KT-30376 Smartcasts don't propagate to the original variable when use not-null assertion or cast expression
• KT-30868 Unsound smartcast if smartcast source and break is placed inside square brackets (indexing expression)
• KT-31053 Nothing? type check isn't equivalent to null check is some places
• KT-29935 Smartcasts don't work if explicit annotated true/false check is used
• KT-30903 Smartcast to null doesn't affect computing of exhaustiveness
• KT-62847 K2: Introduce FIR node for SAM conversion
• KT-63564 K/Wasm: CompilationException with 2.0.0-Beta1
• KT-63345 K2: FIR2IR chooses an incorrect type for smartcast in case of SAM conversion
• KT-63848 ReflectiveAccessLowering does not count arguments of super-calls
• KT-61920 K2: False negative CONST_VAL_WITH_NON_CONST_INITIALIZER when initializer is Java field
• KT-63649 K2: Wild card in superclass confuses EXPANSIVE_INHERITANCE checker
• KT-63569 K2: "IllegalStateException: ?!id:1" caused by private function call
• KT-63842 K2: some arguments of annotations on local declarations are unresolved
• KT-63832 K2: missed context during annotation argument resolution for a type alias, init and property receiver
• KT-62559 KMP, K2: prevent reporting ACTUAL_ANNOTATIONS_NOT_MATCH_EXPECT twice in CLI
• KT-24652 Elvis with 'break' can produce unsound smartcasts in while-true loop
• KT-28508 Possible unsound smartcast in class initializer
• KT-28759 No not-null smartcast from direct assignment if it's split into declaration and value assignment
• KT-28760 No not-null smartcast from direct assignment of this
• KT-29878 Smartcasts from type check or null check don't work if explicit true check as reference equality is used
• KT-29936 Smartcasts don't work if comparing with return value of some function and explicit true/false check is used
• KT-30317 Smartcast doesn't work if smartcast source is used as an operand of the reference equality
• KT-63071 K2 supports calling functions with the dynamic receiver over Nothing?
• KT-59896 K2: Disappeared WRONG_ANNOTATION_TARGET
• KT-56849 Implement K/Wasm K1 diagnostics in K2
• KT-31636 Expect-actual matching doesn't work for inner/nested classes with explicit constructor using typealiases
• KT-63361 K2: Expected FirResolvedTypeRef for return type of FirDefaultPropertyGetter(SubstitutionOverride(DeclarationSite)) but FirImplicitTypeRefImplWithoutSource found
• KT-63377 K2: conflict between type parameter and nested class
• KT-62913 Convert DEFAULT_ARGUMENTS_IN_EXPECT_ACTUALIZED_BY_FAKE_OVERRIDE to checking incompatibility
• KT-63550 K2: fake-override in expect covariant override in actual. Move diagnostics from backend to frontend
• KT-63443 IrFakeOverrideBuilder: ISE "No new fake override recorded" when Java superclass declares abstract toString
• KT-58933 Applying suggested signature from WRONG_NULLABILITY_FOR_JAVA_OVERRIDE leads to red code
• KT-63600 K2: Duplicate WRONG_NULLABILITY_FOR_JAVA_OVERRIDE
• KT-63508 K2: "IllegalArgumentException: Not FirResolvedTypeRef (String) in storeResult" caused by @Deprecated Java function and typo
• KT-63656 K2: "IllegalArgumentException: Local com/example/<anonymous> should never be used to find its corresponding classifier"
• KT-63459 K2: OPT_IN_USAGE_ERROR is absent when calling the enum primary constructor
• KT-59582 OPT_IN_MARKER_CAN_ONLY_BE_USED_AS_ANNOTATION_OR_ARGUMENT_IN_OPT_IN on an annotation import
• KT-63732 K1: False positive OUTER_CLASS_ARGUMENTS_REQUIRED inside anonymous object
• KT-60614 K2: Conflicting INVISIBLE_REFERENCE and UNRESOLVED_REFERENCE reported depending on FIR test for transitive friend module dependencies
• KT-59983 K2: Disappeared IMPLEMENTATION_BY_DELEGATION_IN_EXPECT_CLASS
• KT-57044 K2 LL Tests: false-positive 'Overload resolution ambiguity between candidates: [@Override() fun test(): Unit , fun test(): Unit]'
• KT-58028 K2: False-positive TYPE_PARAMETER_IS_NOT_AN_EXPRESSION
• KT-62560 K2: KAPT4: annotation @ReplaceWith is missing a default value for the element 'imports'
• KT-63068 K2 supports typeRef-name labels
• KT-63642 JVM_IR: don't generate reflective access to getter/setter without property
• KT-62212 K2: require matching of suspend status for override check
• KT-63597 JVM_IR: Properly handle type parameters of outer declaration in code fragment
• KT-61282 K2: Incorrect overridden function for java.nio.CharBuffer.get
• KT-63317 K2: Disallow generic types in contract type assertions
• KT-59922 K2: Disappeared CANNOT_CHECK_FOR_ERASED
• KT-63241 IJ monorepo K2 QG: backward-incompatible compiler ABI change leads to run-time failures of Fleet's kotlinc plugins
• KT-59988 K2: Disappeared TYPE_ARGUMENTS_NOT_ALLOWED
• KT-59936 K2: Disappeared ARGUMENT_PASSED_TWICE
• KT-63522 K2: wrong context for delegated field type
• KT-63454 Properly check that inline fun is in the same module as callee in IrSourceCompilerForInline
• KT-59951 K2: Disappeared NO_TYPE_ARGUMENTS_ON_RHS
• KT-63535 K2: Apply DFA implications for nullable Nothing to both sides
• KT-62727 K2: Missing JSCODE_UNSUPPORTED_FUNCTION_KIND
• KT-62726 K2: Missing JSCODE_WRONG_CONTEXT
• KT-62725 K2: Missing JSCODE_INVALID_PARAMETER_NAME
• KT-62314 Make usages of JavaTypeParameterStack safe
• KT-60924 FIR2IR: Get rid of all unsafe usages of IrSymbol.owner
• KT-57949 FIR: SignatureEnhancement: mutation of java enum entry
• KT-59908 K2: Disappeared RECURSIVE_TYPEALIAS_EXPANSION
• KT-62724 K2: Missing WRONG_JS_FUN_TARGET
• KT-62856 K2: Don't create IR declaration when its symbol is accessed in fir2ir
• KT-61329 K2: Review for diagnostic messages reported by CLI arguments processing
• KT-60604 K2: introduced NON_PUBLIC_CALL_FROM_PUBLIC_INLINE, @PublishedApi needed for constants in annotations
• KT-63286 K2: Top-level properties in scripts are missing initialization checks
• KT-62711 Incorrect ParsedCodeMetaInfo instances
• KT-63122 K2: Improve 'EVALUATION_ERROR' messages
• KT-63164 K2/JVM: compiler codegen crash on invisible property IllegalStateException: Fake override should have at least one overridden descriptor
• KT-62352 jspecify NonNull annotation seems not supported
• KT-56614 K2: Incorrect overload resolution with SAM types
• KT-62783 K2: False positive CAST_NEVER_SUCCEEDS when casting nullable expression to it's non-nullable generic base class
• KT-47931 FIR DFA: smartcast not working for if (x!=null || x!=null && x!=null) {}
• KT-62735 K2: Disappeared EXTERNAL_CLASS_CONSTRUCTOR_PROPERTY_PARAMETER
• KT-62733 K2: Disappeared WRONG_EXTERNAL_DECLARATION
• KT-62734 K2: Disappeared INLINE_EXTERNAL_DECLARATION
• KT-62618 K2: Fix the ensureAllMessagesPresent test
• KT-60312 K2: CCE “class [I cannot be cast to class java.lang.Number ([I and java.lang.Number are in module java.base of loader 'bootstrap')” on using IntArray as vararg
• KT-61362 K2: Properties/fields are missing from system libraries
• KT-52432 Using the IDE compiled with K2 (useFir) throws VerifyError exception
• KT-59825 K2: Fix the TODO about wasExperimentalMarkerClasses in FirSinceKotlinHelpers
• KT-26045 False positive DUPLICATE_LABEL_IN_WHEN for safe calls
• KT-63094 K2: Exception from fir2ir during conversion data class with property of dynamic type
• KT-59822 K2: Fix the TODO in FirConstChecks
• KT-59493 Definitely non-nullable types have type inference issues with extension functions
• KT-63396 K2: property from companion object are unresolved as an annotation argument in type parameter
• KT-62925 K2: Disappeared EXPOSED_FUNCTION_RETURN_TYPE for package-private and type args
• KT-63430 IrFakeOverrideBuilder: VerifyError on calling a function with a context receiver from a superclass
• KT-62420 K2: Remove ConeClassifierLookupTag from ConeTypeVariableTypeConstructor
• KT-59998 K2: Disappeared OPT_IN_MARKER_CAN_ONLY_BE_USED_AS_ANNOTATION_OR_ARGUMENT_IN_OPT_IN
• KT-53308 TYPE_MISMATCH: Contracts on boolean expression has no effect on referential equality to null
• KT-51160 Type mismatch with contracts on narrowing sealed hierarchy fail to smart cast
• KT-49696 Smart cast to non-null with inline non-modifying closures sometimes doesn't work
• KT-46586 SMARTCAST_IMPOSSIBLE when assigning value inside lambda instead of if expression
• KT-41728 False positive no smart cast with unreachable code after return in if expression
• KT-57529 K1/K2: "IllegalStateException: not identifier: <no name provided>" with hard keywords in angle brackets
• KT-59401 K2: Missing ADAPTED_CALLABLE_REFERENCE_AGAINST_REFLECTION_TYPE
• KT-63147 K2: False negative DSL_SCOPE_VIOLATION when member is annotated with @LowPriorityInOverloadResolution
• KT-63172 K2: Java vararg setter should not be used as property accessor
• KT-62306 K2: Compiler internal error for incorrect call on ILT
• KT-61592 kt57320.kt weird diagnostic range for NO_ACTUAL_FOR_EXPECT
• KT-60294 K2: lambda inside object capturing this, when not in K1
• KT-62590 Split expect/actual matcher-checker machinery in two separate components: matcher and checker
• KT-62120 K2: "NoSuchMethodError: java.lang.String" at runtime on class delegating to Java type
• KT-36976 FIR: Provide exact smart casting type
• KT-62628 K2: FirErrorTypeRefImpl doesn't have annotations
• KT-62447 K2. "Replacing annotations in FirErrorTypeRefImpl is not supported" compiler error when annotation is used as variable type or return type
• KT-62541 K2: Missed type mismatch error
• KT-37591 Deprecate cases in FE 1.0 when companion property is prioritized against enum entry

Docs & Examples

• KT-58295 Create a separate page for https://kotl.in/wasm_help
• KT-6259 Docs: add information about default constructor for class

IDE

• KT-55788 [SLC] Declarations with value classes are leaked into light classes

IDE. Gradle. Script

• KT-60813 Scripts: NoSuchMethodError: 'void org.slf4j.Logger.error(java.lang.String, java.lang.Object)' when dependency uses Slf4j API

IDE. JS

• KT-61257 Analysis API:"KotlinIllegalArgumentExceptionWithAttachments: Invalid FirDeclarationOrigin DynamicScope" exception on unsupported JS dynamic usage in scope

IDE. Multiplatform

• KT-45513 Run c-interop generation in parallel during project import
• KT-63126 K2: Analysis API Standalone: IllegalStateException from Kotlin/Native klib

IDE. Script

• KT-61267 K2 Scripts: dependency issues

IR. Actualizer

• KT-62292 K2: Extract IrActualizer into separate module
• KT-63442 IrFakeOverrideBuilder: ISE "Multiple overrides" error when function signatures differ only in the type parameter upper bound

IR. Interpreter

• KT-62683 K2: FIR2IR: IrConst*Transformer doesn't evaluate an expression for const val initializer

IR. Tree

• KT-61970 Refactor IR and FIR tree generators to reuse common logic
• KT-61703 Drop the dependency on kotlinpoet for IR tree generation
• KT-63437 IrFakeOverrideBuilder: ISE "Captured Type does not have a classifier" on complex Java hierarchy

JavaScript

Fixes

• KT-61117 Migrate remaining legacy IC tests to IR
• KT-63808 compileTestDevelopmentExecutableKotlinJs failed in JsIntrinsicTransformers
• KT-61523 KJS: Call main function in per-file mode
• KT-63543 KJS / K2: Exported declaration uses non-exportable return type type: 'kotlin.Unit'
• KT-63089 KJS / K2 : "IllegalArgumentException: source must not be null " for inner class and interface as type
• KT-62077 KJS: TypeError: str.charCodeAt is not a function
• KT-63436 K/JS: Eliminate names for synthetic classes in setMetadataFor()
• KT-61929 KJS: "IllegalStateException: No dispatch receiver parameter for FUN LOCAL_FUNCTION_FOR_LAMBDA" caused by run function in init block
• KT-63013 KJS: requireNotNull not working correctly in JS tests with Kotlin 1.9.20
• KT-63207 KMP / JS: "TypeError: <mangled_name> is not a function" with 1.9.20
• KT-16981 js: Command line arguments passed to main() are always empty
• KT-61525 KJS: Test functions are not invoked in per-file mode

Klibs

• KT-62259 KLIB ABI reader: add information about a backing field to AbiProperty
• KT-62515 Interop klib of concurrent version is not accepted when building dependent project: "The library versions don't match"

Language Design

• KT-62138 K1: false positive (?) NO_SET_METHOD for += resolved as a combination of Map.get and plus
• KT-61573 Emit the compilation warning on expect/actual classes. The warning must mention that expect/actual classes are in Beta

Libraries

• KT-62346 Sublists of ListBuilder does not correctly detect ConcurrentModification
• KT-59441 Design reading and writing future versions of Kotlin metadata
• KT-57922 kotlinx-metadata-jvm does not take into account strict semantics flag
• KT-63341 K2: JVM StringBuilder has no corresponding members for expected class members
• KT-51058 Avoid byte array allocation in File.writeText when possible
• KT-63447 K2: stdlib buildscript error: file included in two modules

Native

• KT-63789 Native: Incremental compilation problem with compose
• KT-50547 [Commonizer] K/N echoServer sample fails with multiple "Unresolved reference" errors on Windows

Native. Build Infrastructure

• KT-63905 Extract ObjC Export Header generation from K/N backend
• KT-63220 [K/N] Unable to specify custom LLVM distribution

Native. C and ObjC Import

• KT-63287 [K/N] Create test model for building/executing C-Interop tests
• KT-63048 K2 ObjC interop: Fields are not supported for Companion of subclass of ObjC type

Native. ObjC Export

• KT-63153 Native: implement a flag to emit compiler warnings on ObjCExport name collisions

Reflection

• KT-60708 Reflection: Not supported ) (parentheses in backticks)

Tools. Compiler Plugins

• KT-53861 K2. Report SERIALIZER_TYPE_INCOMPATIBLE on specific type argument in kotlinx.serialization
• KT-63086 K2: "Parcelable should be a class"
• KT-61432 K2 Parcelize. RawValue is not recognized if parameter is annotated via typealias

Tools. Compiler plugins. Serialization

• KT-63591 K2: "KotlinReflectionInternalError: Could not compute caller for function" on generated internal constructor
• KT-63570 K2 / Serialization: "Class * which is serializer for type * is applied here to type *. This may lead to errors or incorrect behavior."
• KT-63402 K2 / Serialization: "SyntheticAccessorLowering should not attempt to modify other files!" caused by sealed base with generic derived class in separate files

Tools. Gradle

New Features

• KT-61975 Re-purpose kotlin.experimental.tryK2

Performance Improvements

• KT-63005 Avoid registering KMP related compatibility/disambiguration rules for pure JVM/Android projects

Fixes

• KT-60733 Allow specify log level for compiler arguments used to compile sources
• KT-63697 The warning is still presented in terminal after suppressing it with -Xexpect-actual-classes flag
• KT-63491 Restore access to top-level DSL to configure compiler options in MPP
• KT-55322 Kotlin daemon: Cannot perform operation, requested state: Alive > actual: LastSession
• KT-63369 Fix: "The org.gradle.api.plugins.BasePluginConvention type has been deprecated."
• KT-63368 Fix "The automatic loading of test framework implementation dependencies has been deprecated. "
• KT-63601 Fetching Gradle compiler DSL objects using raw strings is inconvenient in the Groovy DSL
• KT-62758 Gradle: make precise task outputs backup enabled by default
• KT-62955 Missing static accessors for Wasm targets in Kotlin Gradle plugin DSL:
• KT-62962 Remove COMPILE_INCREMENTAL_WITH_ARTIFACT_TRANSFORM system property
• KT-63499 Gradle: Source sets conventions are still registered
• KT-52976 Remove deprecated Gradle conventions usages
• KT-62939 Bump minimal supported AGP version to 7.1
• KT-58223 Kotlin Gradle plugin shouldn't store data in project cache directory
• KT-62131 Could not isolate value org.jetbrains.kotlin.gradle.plugin.statistics.BuildFlowService$Parameters_Decorated@63fddc4b of type BuildFlowService.Parameters
• KT-62264 Send build type report metric to FUS
• KT-62617 Update report configuration project FUS metrics

Tools. Gradle. Cocoapods

• KT-63331 CocoaPods plugin noPodspec() causes "property * specifies file * which doesn't exist."

Tools. Gradle. JS

• KT-62780 K/JS: Deprecate node-specific properties in NodeJsRootExtension
• KT-63544 KGP: JS - KotlinJsIrLink is not compatible with Gradle CC starting 8.4
• KT-63312 KJS: Apply IR flags for JS compilations unconditionally
• KT-62633 wasmWasi/JsNodeTest tasks are always not up-to-date
• KT-63040 K/JS: Rework outputs of webpack and distribution task

Tools. Gradle. Multiplatform

• KT-63315 Wasm gradle plugin DSL is invalid for parameterless wasmWasi method
• KT-63338 [KMP] metadata task fails to find cinterop classes from dependency projects
• KT-63197 After using Kotlin 1.9.20 on Windows 11, the gradle sync failed
• KT-63044 KGP: Multiplatform - 8.4 configuration cache support
• KT-63011 Apple Framework Artifacts is not connected to KotlinNativeTask

Tools. Gradle. Native

• KT-56455 Gradle: remove enableEndorsedLibs from codebase

Tools. Incremental Compile

• KT-56963 Add MPP/Jvm incremental compilation tests for both K1 and K2 modes
• KT-63876 Move useful utilities from KmpIncrementalITBase.kt to KGPBaseTest and/or common utils
• KT-63010 Build reports may contain incorrect measurements for "Total size of the cache directory"
• KT-59178 With language version = 2.0 incremental compilation of JVM, JS fails on matching expect and actual declarations

Tools. JPS

• KT-63549 Add compiler performance metrics to JPS build reports
• KT-64026 Maven. JVM target is imported as 1.6(deprecated) if an invalid parameter value specified in pom.xml
• KT-63594 ClassCastException in JPS statistics
• KT-63799 Make plugin classpath serialization path agnostic

Tools. Kapt

• KT-60821 [KAPT4] Make sure that KAPT produces correct JCTree; if that's not possible, investigate using JavaPoet as an alternative
• KT-57389 KAPT3 uses a Javac API for JCImport which will break in JDK 21

Tools. Maven

• KT-63322 Add tests for KTIJ-21742

Tools. Scripts

• KT-58367 Remove script-util from the repo
• KT-54819 Scripts: Not able to use slf4j in .main.kts
• KT-63352 Scripting dependencies resolver logs "file not found" even if the artefact is retrieved

Tools. Wasm

• KT-63417 KMP hierarchy DSL. Split withWasm() into withWasmJs() and withWasmWasi()

Checksums

Changelog

Analysis. API

Performance Improvements

• KT-61789 K2: optimize getFirForNonKtFileElement for references inside super type reference
• KT-59498 K2: getOnAirGetTowerContextProvider took too much time due to on air resolve
• KT-61728 Analysis API: optimize AllCandidatesResolver.getAllCandidates

Fixes

• KT-61252 K2: IDE K2: "By now the annotations argument mapping should have been resolved"
• KT-62310 K2 IDE. False positives errors with external annotations
• KT-62397 K2 IDE. FP Error in the editor on RequiresOptIn annotation from the lib despite the warning level
• KT-62705 K2: "lazyResolveToPhase(IMPORTS) cannot be called..." from light classes
• KT-62626 IllegalStateException: Cannot build symbol for class org.jetbrains.kotlin.psi.KtScriptInitializer
• KT-62693 K2: IDE K2: "PSI should present for declaration built by Kotlin code"
• KT-62674 K2: "Scope for type ConeClassLikeTypeImpl" is null from transitive dependencies
• KT-61889 Analysis API: Migrate KtFirReferenceShortener to ContextCollector instead of FirResolveContextCollector
• KT-62772 Analysis API: No 'org.jetbrains.kotlin.fir.java.FirSyntheticPropertiesStorage'(31) in array owner: LLFirSourcesSession when analysing builtins in a context of common code
• KT-61296 K2: do not resolve the entire file on lazyResolve call if FirFile is passed
• KT-60319 K2 IDE: "Stability for initialized variable always should be computable"
• KT-62859 K2 IDE: "Evaluate expression" throws exception when calling "Any?.toString()"
• KT-62421 K2: IDE K2: "lazyResolveToPhase(BODY_RESOLVE) cannot be called from a transformer with a phase BODY_RESOLVE."
• KT-63058 K2 IDE: Code completion unexpectedly imports static/companion object method
• KT-62588 getExpectedType should not calculate type of the expression
• KT-61990 K2: Unexpected returnTypeRef for FirSyntheticProperty
• KT-62625 K2: 'FirLazyExpression should be calculated before accessing' for unresolved super type
• KT-62071 Analysis API: KtFirScopeProvider.getScopeContextForPosition throws exception when ImplicitReceiverValue.implicitScope is null
• KT-62691 K2: optimize getFirForNonKtFileElement for references inside 'where'
• KT-62587 K2 IDE. FP unresolved reference on accessing nested class in annotation argument
• KT-62834 K2: missing file node level in control flow builder
• KT-62768 Analysis API: No 'org.jetbrains.kotlin.fir.scopes.impl.FirDelegatedMembersFilter'(44) in array owner: LLFirSourcesSession exception on analysing common code
• KT-62874 K2: FirLazyExpression should be calculated before accessing
• KT-62407 Analysis API: resolve [this] in KDoc to extension receiver
• KT-61204 K2: "FirLazyExpression should be calculated before accessing in ktor HttpBinApplication"
• KT-61901 Analysis API: Declared member scopes for Java classes are missing static members
• KT-61800 Analysis API: Provide separate declared member scopes for non-static and static callables
• KT-61255 Analysis API: Get rid of valueOf, values and entries from a declared member scope
• KT-62466 Expected type for functional expression should include inferred types
• KT-61203 IDE K2: "Expected FirResolvedArgumentList for FirAnnotationCallImpl of FirRegularClassImpl(Source) but FirArgumentListImpl found"
• KT-61791 Analysis API: Implement combined getPackage for combined Kotlin symbol providers
• KT-62437 K2 IDE. Resolution does not work inside lambda expression in constructor argument in supertypes
• KT-62244 K2: Analysis API Standalone: Resolving klib dependencies from binary roots terminates application
• KT-62897 K2 IDE. Unresolved declarations from libraries which are doubled in intellij project libraries
• KT-61615 K2: No 'org.jetbrains.kotlin.fir.analysis.js.checkers.FirJsModuleKind' in array owner: LLFirSourcesSession
• KT-59334 K2: LLFirImplicitTypesLazyResolver problems
• KT-62038 K2: Nested classes are missing in symbol light class structure tests for libraries
• KT-61788 Analysis API: Symbol for FirAnonymousInitializer cannot be null
• KT-62139 Analysis API: KtFe10AnalysisSession.createContextDependentCopy does not need validity check
• KT-62090 Analysis API: introduce an API to get a substitution formed by class inheritance
• KT-62268 K2 IDE. No autocompletion and IllegalStateException for Pair
• KT-62302 Support PsiType -> KtType conversion
• KT-60325 K2 IDE. "IllegalArgumentException: source must not be null" on throw usage attempt
• KT-61431 K2: KtPropertyAccessorSymbolPointer pointer already disposed for $$result script property
• KT-60957 K2: Analysis API: Reference shortener does not work correctly with invoke function calls on properties
• KT-58490 K2: LLFirTypeLazyResolver problems
• KT-58494 K2: LLFirAnnotationArgumentsLazyResolver problems
• KT-58492 K2: LLFirBodyLazyResolver problems
• KT-58769 K2: LL FIR: implement platform-dependent session factories
• KT-60343 K2 IDE. IllegalArgumentException on passing incorrect type parameter to function
• KT-61383 K2: 'KtCompilerFacility' fails on code fragment compilation in library sources with duplicated dependencies
• KT-61842 K2: reduce number of "in-block modification" events
• KT-62012 K2: "KtReadActionConfinementLifetimeToken is inaccessible: Called outside analyse method"
• KT-61371 K2: Analysis API standalone: register compiler symbol provider for libraries in standalone mode
• KT-61422 K2 IDE: "No array element type for vararg value parameter: org.jetbrains.kotlin.fir.declarations.impl.FirValueParameterImpl"
• KT-60611 K2: reduce number of "in-block modification" events
• KT-61425 Analysis API: Provide a way to get a declared member scope for an enum entry's initializing anonymous object
• KT-61405 Analysis API: An enum entry should not be a KtSymbolWithMembers
• KT-60904 K2: IDE K2: "For DESTRUCTURING_DECLARATION_ENTRY with text _, one of element types expected, but FirValueParameterSymbol found"
• KT-61260 K2 Scripts: Containing function should be not null for KtParameter
• KT-61568 FIR Analysis API: collectCallCandidates gives presence to the top level functions in the presence of more suitable overrides
• KT-60610 K2 IDE: move "out of block" processing logic into LL FIR
• KT-61597 Analysis API: KotlinIllegalStateExceptionWithAttachments: expected as maximum one expect for the actual on errorneous code with multiple expects
• KT-59793 K2: class org.jetbrains.kotlin.fir.declarations.impl.FirErrorImportImpl cannot be cast to class org.jetbrains.kotlin.fir.declarations.FirResolvedImport
• KT-61599 K2: ContextCollector: Support smart cast collection
• KT-61689 Analysis API: ContextCollector provides incorrect context in scripts
• KT-61683 Analysis API: resolve ambiguities in kotlin project
• KT-61245 Analysis API: ContextCollector provides incorrect context for supertype constructor calls
• KT-60384 K2: Opening @JvmName source in IDEA: NPE at PsiRawFirBuilder$Visitor.toFirConstructor()
• KT-60918 K2 IDE: "FirDeclaration was not found for class org.jetbrains.kotlin.psi.KtDestructuringDeclarationEntry, fir is null"
• KT-61013 K2 Scripts: LLFirReturnTypeCalculatorWithJump: No designation of local declaration
• KT-59517 K2 IDE: KotlinExceptionWithAttachments: Modules are inconsistent
• KT-61331 K2: add cache restoring in case of existing context
• KT-61408 K2: IDE K2: "Inconsistency in the cache. Someone without context put a null value in the cache"

Backend. Native. Debug

• KT-57365 [Native] Incorrect debug info on inline function call site

Backend. Wasm

• KT-62147 [Kotlin/Wasm] Nothing typed when expression cause a backend error
• KT-61958 Update SpiderMonkey and return its usage in box tests when they switch to the final opcodes for GC and FTR proposals
• KT-60828 K/Wasm: return br_on_cast_fail usages
• KT-59720 K/Wasm: update to final opcodes
• KT-59084 WASM: "RuntimeError: illegal cast" caused by inline class and JsAny
• KT-60700 [WASM] test FirWasmCodegenBoxTestGenerated.testSuspendUnitConversion failed after KT-60259

Compiler

New Features

• KT-62239 Allow enum entries without parentheses uniformly
• KT-22004 Allow to resolve CONFLICTING_OVERLOADS with Deprecated(HIDDEN)
• KT-11712 Smart cast is not applied for invisible setter
• KT-61077 Support provideDelegate inference from var property type
• KT-59504 K2 compiler does not require resolved 'componentX' functions for the placeholder ('_') variables in the destructuring declarations

Performance Improvements

• KT-62619 FIR: Checker performance regression due to MISSING_DEPENDENCY checkers
• KT-62044 Do not add nullability annotations to the methods of anonymous class
• KT-62706 Optimize KtSourceElement.findChild()
• KT-62513 Do not add nullability annotations to the methods of local classes
• KT-61991 K2: avoid redundant full body resolution for properties during implicit type phase
• KT-61604 [K/N] Bitcode dependency linking is slow for large compilations
• KT-39054 Optimize delegated properties which call get/set on the given KProperty instance on JVM
• KT-61635 K2: getConstructorKeyword call in PsiRawFirBuilder.toFirConstructor forces AST load
• KT-57616 K2: Consider optimizing reversed versions of persistent lists in FirTowerDataContext

Fixes

• KT-63257 K2: FIR2IR inserts incorrect implicit cast for smartcasted variable
• KT-61459 K2: type parameters cannot be parameterized with type arguments
• KT-61959 K2: Type parameters from outer class leak to nested class
• KT-61384 IrFakeOverrideBuilder incorrectly checks visibility for friend modules
• KT-62032 K2: Render flexible types as A..B instead of cryptic ft<A, B> in diagnostic messages
• KT-59940 K2: Disappeared ACTUAL_ANNOTATION_CONFLICTING_DEFAULT_ARGUMENT_VALUE
• KT-61243 K2: Always use declaredMemberScope-s in FirConflictsHelpers instead of declarations
• KT-59430 K2: Missing CALLABLE_REFERENCE_RESOLUTION_AMBIGUITY
• KT-56683 K2: No control flow analysis for top-level properties
• KT-62334 K2: FIR should not generate delegated functions for methods from java interface with default implementation
• KT-59590 JVM IR: NotImplementedError during rendering of conflicting JVM signatures diagnostic
• KT-62607 K2: "Overload resolution ambiguity between candidates"
• KT-55096 K2: false-positive smartcast after equals check with reassignment in RHS of ==
• KT-62590 Split expect/actual matcher-checker machinery in two separate components: matcher and checker
• KT-62120 K2: "NoSuchMethodError: java.lang.String" at runtime on class delegating to Java type
• KT-62916 K2: False positive INCOMPATIBLE_MATCHING
• KT-62752 expect-actual matcher/checker: return type must be "checking" incompatibility
• KT-62137 Compiler fails on null tracking (inference) for safe call
• KT-59744 K2: false negative VAL_REASSIGNMENT in case of reassignment inside custom setter
• KT-58531 K2: "Property must be initialized" compile error
• KT-62404 K2 Scripting for gradle: unresolved name errors on implicit imports
• KT-62305 K2: Missing Fir metadata serialization support for scripts
• KT-62197 K2 and Apache Commons's MutableLong: Overload resolution ambiguity between candidates
• KT-53551 suspend functional type with context receiver causes ClassCastException
• KT-61491 K2 AA: Multiple FIR declarations for the same delegated property
• KT-55965 K2: NPE via usage of functions that return Nothing but have no return expressions
• KT-60942 K2: Transitive dependency IR is not deserialized correctly
• KT-55319 K2: False negative NON_LOCAL_RETURN_NOT_ALLOWED for non-local returns example
• KT-62151 K2. overload resolution ambiguity for calls of Java record compact constructors
• KT-62944 K2: Symbols with context receiver shouldn't be rendered with line break
• KT-62394 K2: Synthetic property scope doesn't consider java classes in the hierarchy
• KT-60117 K2: ISE “Cannot serialize error type: ERROR CLASS: Cannot infer variable type without initializer / getter / delegate” on compiling lateinit property without initialization
• KT-61039 False positive ABSTRACT_MEMBER_NOT_IMPLEMENTED in K1 when expect actual super types scopes don't match
• KT-60042 K2: Introduced PRIMARY_CONSTRUCTOR_REQUIRED_FOR_DATA_CLASS
• KT-59402 K2: Missing EXPANSIVE_INHERITANCE and EXPANSIVE_INHERITANCE_IN_JAVA
• KT-62467 K2: Result type of elvis operator should be flexible if rhs is flexible
• KT-62126 KJS / K2: "InterpreterError: VALUE_PARAMETER" caused by reflection, delegation and languageVersion = 1.9
• KT-62679 K2: drop ARGUMENTS_OF_ANNOTATIONS phase
• KT-56615 K2: False-negative USELESS_CAST after double smartcast
• KT-59820 K2: Investigate the TODO in FirCastDiagnosticsHelpers
• KT-61100 K2: wrong type for "value" parameter of java annotation constructor
• KT-62491 K2. No 'when' expression must be exhaustive error when Java sealed class inheritors are not listed in permits clause
• KT-60095 K2: Introduced INCOMPATIBLE_TYPES
• KT-61598 K2: report IR_WITH_UNSTABLE_ABI_COMPILED_CLASS
• KT-59561 K2/MPP reports INCOMPATIBLE_MATCHING when an actual annotation declaration with vararg property is typealias with @Suppress
• KT-60123 K2: PROPERTY_WITH_NO_TYPE_NO_INITIALIZER isn't working in IDE for lateinit property without a type
• KT-59935 K2: Disappeared PROPERTY_WITH_NO_TYPE_NO_INITIALIZER
• KT-58455 K2(LT). Internal compiler error "UninitializedPropertyAccessException: lateinit property identifier has not been initialized" on missing type parameter in "where" constraint
• KT-60714 K2: Implement resolve to private members from Evaluator in K2
• KT-59577 K2. Enum constant name is not specified in error text
• KT-60003 K2: Disappeared INVALID_CHARACTERS_NATIVE_ERROR
• KT-62099 K2: "Type arguments should be specified for an outer class" error about typealias
• KT-60983 K2: "Argument type mismatch: actual type is android/view/View.OnApplyWindowInsetsListener but androidx/core/view/OnApplyWindowInsetsListener? was expected"
• KT-60111 K2: Location regressions for operators
• KT-59399 K2: Missing JSCODE_NO_JAVASCRIPT_PRODUCED
• KT-59388 K2: Missing JSCODE_ERROR
• KT-59435 K2: Missing JSCODE_ARGUMENT_SHOULD_BE_CONSTANT
• KT-60601 K2 / Maven: Overload resolution ambiguity between candidates inline method
• KT-60778 K2: implement MISSING_DEPENDENCY_CLASS(_SUPERCLASS) errors
• KT-62581 K2: Difference in kind flag in metadata
• KT-59956 K2: Disappeared INAPPLICABLE_OPERATOR_MODIFIER
• KT-35913 Diagnostic error VAL_REASSIGNMENT is not reported multiple times
• KT-60059 K2: Introduced VAL_REASSIGNMENT
• KT-59945 K2: Disappeared ANONYMOUS_FUNCTION_WITH_NAME
• KT-62573 K2: incorrect parsing behavior with named functions as expressions
• KT-56629 K2: an instance of USELESS_CAST was not moved under EnableDfaWarningsInK2 language feature
• KT-58034 Inconsistent resolve for nested objects in presence of a companion object property with the same name
• KT-59864 K2: Bad locations with delegates
• KT-59584 K2: Bad startOffset for 'this'
• KT-61388 K2: ISE "Annotations are resolved twice" from CompilerRequiredAnnotationsComputationSession on nested annotation
• KT-62027 "java.lang.IndexOutOfBoundsException: Empty list doesn't contain element at index 0" caused by ClassicExpectActualMatchingContext.kt when annotation @AllowDifferentMembersInActual used
• KT-61055 K2: Investigate if usage of toResolvedCallableSymbol is correct at FirDataFlowAnalyzer#processConditionalContract
• KT-61688 K2: FIR renderings of type annotations leak through the diagnostics' messages
• KT-61794 FIR: MergePostponedLambdaExitsNode.flow remains uninitialized after resolve
• KT-61068 Bounds of type parameters are not enforced during inheritance of inner classes with generic outer classes
• KT-61065 K2: @Suppress annotation is ignored inside preconditions of when-clauses
• KT-61937 K2: implicit script receiver from ScriptDefinition are not visible for invoke
• KT-61076 K2: false-positive conflicting overloads error on suspending function and private Java method from a supertype
• KT-61075 K2: type inference for delegate expressions with complexly bounded type variables fails on properties with annotated accessors
• KT-58579 K2: false-positive new inference error on invoking a generic function on Java wildcard type bounded by raw-typed Java inner class
• KT-62671 K2: fir2ir generates a duplicate of delegated function for class from a common module
• KT-60682 K2: Disappeared DEPRECATION
• KT-62143 Error: Identity equality for arguments of types 'kotlin/Int?' and 'kotlin/Nothing?' is prohibited
• KT-61517 K2: FirModuleDescriptor should correctly provide dependencies from FirModuleData
• KT-62578 K2: @NoInfer annotation doesn't work for deserialized functions
• KT-59916 K2: Disappeared REPEATED_ANNOTATION
• KT-62450 K2: Disappeared OPT_IN_USAGE_ERROR for a data class property during the destructuring declaration
• KT-59997 K2: Disappeared OPT_IN_USAGE_ERROR
• KT-62393 K2: FIR doesn't count visibility when creating synthetic property override
• KT-61208 EnumEntries mappings are generated incorrectly in the face of incremental compilation
• KT-61786 K2: Remove type enhancement on java final fields
• KT-57811 K2: make java static string and int fields not null
• KT-62531 InvalidProtocolBufferException on reading module metadata compiled by K2 from compilers earlier than 1.8.20 with -Xskip-metadata-version-check
• KT-59371 K2: Missing MISSING_DEPENDENCY_CLASS
• KT-61511 IrFakeOverride builder: objc overridability condition is not supported
• KT-62316 K2: CONFLICTING_INHERITED_JVM_DECLARATIONS on List subclass inheriting remove/removeAt from Java superclass
• KT-60671 KMP: check other annotation targets in expect and actual annotations compatibility checker
• KT-62451 K2: Disappeared OPT_IN_USAGE_ERROR for typealias
• KT-62452 K2: Violation of OPT_IN_USAGE_ERROR non-propagating opt-in rules for typealias
• KT-59927 K2: Disappeared INVISIBLE_REFERENCE
• KT-60104 K2: Introduced FUNCTION_CALL_EXPECTED
• KT-57513 K2: Bound smart casts don't work with Strings
• KT-62146 K2: @Suppress does not work with named argument
• KT-62475 K2: IrExternalModuleFragments contains incorrect data in Fir2Ir
• KT-61983 K2: *fir.kt.txt dump uses different naming approach for local vars
• KT-59970 K2: Disappeared NULLABLE_TYPE_IN_CLASS_LITERAL_LHS
• KT-58216 K2 (2.0): when is not checked for exhaustiveness with Java sealed class
• KT-62036 KMP: consider prohibiting actual fake-override when the corresponding expect class has default arguments
• KT-61205 Compose Compiler K2/ios: No file for /App|App(){}[0] when running linkPodDebugFrameworkIosX64
• KT-58240 Support running irText compiler tests against the Native backend
• KT-59565 K2. Internal error "IndexOutOfBoundsException: Index -1 out of bounds for length 0" on incorrect usage of annotation in type parameter
• KT-59393 K2: Missing TYPE_ARGUMENTS_FOR_OUTER_CLASS_WHEN_NESTED_REFERENCED
• KT-59954 K2: Disappeared REPEATED_MODIFIER
• KT-62127 "NoSuchFieldError: TRUE$delegate" on referencing companion's variable in submodule
• KT-57100 K2 does not report Conflicting overloads and backend crashes with Exception during IR lowering on conflict overloading with suspend function
• KT-62129 K2: Verification error on calling an extension from an env with 2+ context receivers
• KT-59955 K2: Disappeared INCOMPATIBLE_MODIFIERS
• KT-61572 [K2/N] Missing diagnostic SUPER_CALL_WITH_DEFAULT_PARAMETERS in test for MPP supercall with default params
• KT-59514 K2: New inference error with jspecify and Java interop
• KT-62263 Turn "different expect/actual members" error into a warning
• KT-62262 [K2/N] tests/samples/uikit compilation fails with NPE in checkCanGenerateOverrideInit
• KT-52213 Context receivers: "No mapping for symbol: VALUE_PARAMETER" caused by contextual suspending function type with receiver
• KT-62114 K2: Unresolved reference for smart cast inside when (but not if)
• KT-59373 K2: Missing INVISIBLE_MEMBER
• KT-61844 K2: "Expression * of type * cannot be invoked as a function" caused by private property
• KT-60581 K2 fails with New inference error for assertThat under strange circumstances
• KT-61735 [FIR] Assignment to val with flexible type dispatch receiver causes crash
• KT-59942 K2: Disappeared ANNOTATION_PARAMETER_DEFAULT_VALUE_MUST_BE_CONSTANT
• KT-62058 K2: use PRE_RELEASE flag until 2.0-RC
• KT-59931 K2: Disappeared CLASS_LITERAL_LHS_NOT_A_CLASS
• KT-59377 K2: Missing CALL_TO_JS_MODULE_WITHOUT_MODULE_SYSTEM
• KT-61645 K2/KMP: Set stdlib-native before stdlib-commonMain in dependencies for shared native metadata compilation
• KT-61974 K2: "ClassCastException: class cannot be cast to class java.lang.Void" in test
• KT-61637 K2: Store all IR declarations inside Fir2IrDeclarationStorage
• KT-61924 Native: problem with abstract fake override from Any
• KT-60921 K2: IndexOutOfBoundsException on attempt to cast an element to inner class with type parameter
• KT-61933 K2: "Argument type mismatch: actual type is 'Foo<kotlin/Function0<kotlin/Unit>>' but 'Foo<kotlin/coroutines/SuspendFunction0<kotlin/Unit>>' was expected"
• KT-59429 K2: Missing ABBREVIATED_NOTHING_RETURN_TYPE
• KT-59420 K2: Missing ABBREVIATED_NOTHING_PROPERTY_TYPE
• KT-59965 K2: Disappeared CANNOT_ALL_UNDER_IMPORT_FROM_SINGLETON
• KT-61732 K2: Analysis API: resolve ambiguities in kotlin project
• KT-60499 K2: Order of synthetic fields is different from K1's order
• KT-61773 K2 Native: support reporting PRE_RELEASE_CLASS
• KT-61578 [FIR] Resolution to private companion objects does not produce INVISIBLE_REFERENCE diagnostic
• KT-62031 K2: Render k2-specific flexible types in a more compact way in diagnostic messages
• KT-62030 K2: Render dot-separated FQNs instead of slash-separated ones in diagnostics
• KT-59950 K2: Disappeared ILLEGAL_ESCAPE
• KT-61827 K2: Fix rendering of NO_ACTUAL_CLASS_MEMBER_FOR_EXPECTED_CLASS message
• KT-61386 IrFakeOverrideBuilder: wrong dispatch receiver type
• KT-59907 K2: Disappeared RETURN_TYPE_MISMATCH
• KT-62056 K2: Drop FIR_COMPILED_CLASS error in K1
• KT-61824 K2: Don't render internal compiler type annotations in diagnostic messages
• KT-61826 K2: Fix rendering of SUSPENSION_POINT_INSIDE_CRITICAL_SECTION message
• KT-57858 @PlatformDependent annotation should be considered in JS and Native
• KT-61876 K2: FirCommonSessionFactory does not register visibility checker for a library session
• KT-60264 K2: while loop body block sometimes replaced with single expression
• KT-58542 K2: Store abbreviated types in deserialized declarations as attributes for rendering
• KT-62008 K2: Java getter function may be enhanced twice
• KT-61921 K2: Check for false positive/negative diagnostics caused by wrong handling of typealiases
• KT-41997 False positive "Value class cannot have properties with backing fields" inside expect class
• KT-62017 K2: ISE "No real overrides for FUN FAKE_OVERRIDE" on calling package-private Java method through anonymous object
• KT-58247 Incorrect inference of nullable types inside Optional
• KT-61309 K2: Only named arguments are available for Java annotations
• KT-61366 IrFakeOverrideBuilder ignores package-private visibility
• KT-59899 K2: Disappeared EXPECTED_DECLARATION_WITH_BODY
• KT-59980 K2: Disappeared EXPECTED_ENUM_CONSTRUCTOR
• KT-59982 K2: Disappeared EXPECTED_CLASS_CONSTRUCTOR_PROPERTY_PARAMETER
• KT-61499 K2: False positive "Const 'val' initializer should be a constant value" when using typealias
• KT-62005 K2: No conflicting declarations error for constructors of nested classes and member functions
• KT-61972 K2: FIR2IR crashes on converting data classes in MPP setup
• KT-60105 K2: Introduced UNDERSCORE_USAGE_WITHOUT_BACKTICKS
• KT-61443 K2: Return typeId -1 during JS compilation
• KT-60075 K2: Introduced ACTUAL_WITHOUT_EXPECT
• KT-61668 Put expect/actual diagnostics introduced in 1.9.20 release under 1.9 Language Version
• KT-61751 IrFakeOverrideBuilder: keep flexible type annotations when remapping/substituting types
• KT-61778 K2: Overload resolution ambiguity between expect and non-expect in native build
• KT-61367 K2: Introduce OptIn for FirExpression.coneTypeOrNull
• KT-61802 K2: infinite recursion in constant evaluator causing StackOverflowError
• KT-60043 K2: Introduced PROPERTY_AS_OPERATOR
• KT-61691 K2: This annotation is not applicable to target 'local variable'
• KT-59915 K2: Disappeared TOO_MANY_ARGUMENTS
• KT-59925 K2: Disappeared VIRTUAL_MEMBER_HIDDEN
• KT-61173 K2: FirProperty.hasBackingField is true for an expect val
• KT-61696 K2: Cannot override method of interface if superclass has package-protected method with same signature
• KT-59370 K2: Missing JS_NAME_CLASH
• KT-36056 [FIR] Fix implementation of try/catch/finally in DFA
• KT-61719 K2. Invisible reference is shown for whole type reference instead of single name reference
• KT-60248 K2: Type abbreviations are not stored in IR
• KT-59251 KMP/JS: forbid matching actual callable with dynamic return type to expect callable with non-dynamic return type
• KT-61510 K2: internal declarations are invisible in cyclically dependent modules
• KT-60048 K2: Introduced MISSING_EXCEPTION_IN_THROWS_ON_SUSPEND
• KT-59425 K2: Missing JS_FAKE_NAME_CLASH
• KT-61060 K2: Rewrite delegate inference
• KT-59529 K2: "property delegate must have" caused by class hierarchy
• KT-55471 K2. Unresolved reference for nested type is shown instead of outer class
• KT-58896 K2: Higher priority expect overload candidates in common code lose in overload resolution to non-expects
• KT-58476 Context receivers: "No mapping for symbol: VALUE_PARAMETER" with context-receiver inside suspended lambda calling another suspended function
• KT-60780 K2: missing PRE_RELEASE_CLASS
• KT-59855 K2: Replace FirExpression.typeRef with coneType
• KT-59391 K2: Missing JS_BUILTIN_NAME_CLASH
• KT-59392 K2: Missing NAME_CONTAINS_ILLEGAL_CHARS
• KT-59110 K2. "NotImplementedError: An operation is not implemented." error on incorrect @Target annotation
• KT-53565 K2: no WRONG_ANNOTATION_TARGET on when subject
• KT-54568 K2: Type variables leak into implicit it parameter of lambdas
• KT-60892 K2: Implement diagnostics around @OptionalExpectation
• KT-61029 K2: Duplicates when processing direct overridden callables
• KT-60917 K2: "Unresolved reference" for operator for array value
• KT-59367 K2: Missing MIXING_SUSPEND_AND_NON_SUSPEND_SUPERTYPES
• KT-60268 K2: lazy annotation classes have wrong modality
• KT-61129 K2: Implement error suppression warning
• KT-60536 K2: FIR2IR Crash when resolving to companion of internal class with Suppress("INVISIBLE_REFERENCE")
• KT-55196 K2: False-negative CONST_VAL_WITH_NON_CONST_INITIALIZER on boolean .not() call
• KT-60292 K2: annotations on local delegated properties are lost
• KT-59418 K2: Missing DUPLICATE_PARAMETER_NAME_IN_FUNCTION_TYPE
• KT-59422 K2: Missing NON_SOURCE_ANNOTATION_ON_INLINED_LAMBDA_EXPRESSION
• KT-57963 K2: MPP: Annotation calls should be actualized
• KT-61407 K2: java.lang.IllegalArgumentException: Stability for initialized variable always should be computable
• KT-59186 K2: False negative CONFLICTING_OVERLOADS in nested functions
• KT-54390 K2: ClassId for local classes do not match with specification
• KT-61277 K2: Expand the MIXING_SUSPEND_AND_NON_SUSPEND_SUPERTYPES check to other function kinds
• KT-61548 Compiler crashes with StackOverflowError when mapping types
• KT-56757 Drop IGNORE_BACKEND_K2_LIGHT_TREE directive
• KT-61330 K2: No BinarySourceElement for system libraries
• KT-61166 Inherited platform declaration clash & accidental override
• KT-58764 [K2] Make FirResolvedDeclarationStatus.modality not nullable
• KT-61576 [FIR] Private type alias for public class constructor is always visible
• KT-60531 K2/JS: Report diagnostics before running FIR2IR
• KT-59900 K2: Disappeared NESTED_CLASS_NOT_ALLOWED
• KT-59344 K2: implement deprecation warnings from KT-53153
• KT-61067 K2. No Assignments are not expressions
• KT-61144 FIR2IR: Fix field access for class context receiver from debugger evaluator in K2
• KT-59914 K2: Disappeared RETURN_NOT_ALLOWED
• KT-60136 Wrong IR is generated for spread call in annotation call when annotation has a vararg parameter
• KT-56872 K2: not all reassignments, operator assignments, increments, decrements are tracked in DFA for try/catch expressions
• KT-60397 K2/MPP: don't perform enhancement twice when Java method is called from different modules
• KT-61640 K2: Share declarations from JvmMappedScope between sessions in MPP scenario
• KT-59051 "ISE: IrSimpleFunctionSymbolImpl is already bound" when implementing multiple interfaces by delegation where one of them overrides equals/hashCode
• KT-60380 K2: IAE: class org.jetbrains.kotlin.psi.KtLambdaArgument is not a subtype of class org.jetbrains.kotlin.psi.KtExpression for factory TYPECHECKER_HAS_RUN_INTO_RECURSIVE_PROBLEM
• KT-60795 K2: missing INCOMPATIBLE_CLASS and corresponding CLI error
• KT-59650 K2: Get rid of FirNoReceiverExpression
• KT-60555 K2. FirJavaClass source field is null
• KT-61045 K2: Missing return from DELEGATED_PROPERTY_ACCESSOR setter
• KT-60636 KMP: K2 handling of actual typealiases to nullable types
• KT-59815 K2: Avoid recomputing argumentVariables
• KT-61409 Kotlin/Native: crash in kmm-production-sample (compose-app) with escape analysis enabled
• KT-61348 K2: Refactor FIR2IR declaration storages
• KT-61249 Move fir-related code from backend.native module
• KT-59478 K2: StackOverflowError on invalid code with nullable unresolved
• KT-59893 K2: Disappeared WRONG_NUMBER_OF_TYPE_ARGUMENTS
• KT-60450 K2: IOOBE from analyzeAndGetLambdaReturnArguments
• KT-61442 K2: Consider stricter filtering on implicit integer coercion
• KT-61441 K2: Wrong overload is chosen with ImplicitIntegerCoercion enabled
• KT-57076 K2 does not report 'More than one overridden descriptor declares a default value'
• KT-55672 K2. Operator name message instead of "Unresolved reference" when operator isn't defined for type
• KT-60252 K2: Supertype argument is not substituted in fake override receivers and value parameters
• KT-60687 K2: Introduced UNEXPECTED_SAFE_CALL
• KT-59664 Inline modifier can be added to a constructor parameter, but it does not have any effect
• KT-61312 K2: Remove FirExpression.typeRef completely when Compose was migrated
• KT-60602 Fix scripting tests in 2.0 branch
• KT-60771 K2: "Conflicting declarations". Unable to re-declare variable if the first one comes from a destructured element
• KT-60760 K2: Every FirFunctionCall has an implicit type reference which points to the return type declaration
• KT-59944 K2: Disappeared NON_MEMBER_FUNCTION_NO_BODY
• KT-60936 KMP: check annotations compatibility on members inside expect and actual class scopes
• KT-60668 KMP: check expect and actual annotations match when actual method is fake override
• KT-60250 K2: origin is set too many times for elvis operator
• KT-60254 K2: Extra unset type argument on Java field reference
• KT-60245 K2: Extra return is generated in always throwing function
• KT-59407 K2: Missing MISSING_CONSTRUCTOR_KEYWORD
• KT-57681 Request review for all FIR diagnostic messages
• KT-57738 K2: unresolved class fields and methods in kotlin scripts
• KT-60885 K2: Fix testSelfUpperBoundInference test in LV 2.0 branch
• KT-59957 K2: Missing UNSUPPORTED_SEALED_FUN_INTERFACE
• KT-60000 K2: Missing UNSUPPORTED_INHERITANCE_FROM_JAVA_MEMBER_REFERENCING_KOTLIN_FUNCTION
• KT-60886 K2: Fix testDirectoryWithRelativePath in LV 2.0 branch
• KT-60002 K2: Missing UNSUPPORTED_SUSPEND_TEST
• KT-59419 K2: Missing MULTIPLE_DEFAULTS_INHERITED_FROM_SUPERTYPES_WHEN_NO_EXPLICIT_OVERRIDE
• KT-60297 K2: finally block is not coerced to unit
• KT-59416 K2: Missing EXTERNAL_INTERFACE_AS_REIFIED_TYPE_ARGUMENT
• KT-59417 K2: Missing CALL_FROM_UMD_MUST_BE_JS_MODULE_AND_JS_NON_MODULE
• KT-59381 K2: Missing CALL_TO_JS_NON_MODULE_WITH_MODULE_SYSTEM
• KT-59384 K2: Missing DYNAMIC_NOT_ALLOWED
• KT-59406 K2: Missing PROPERTY_DELEGATION_BY_DYNAMIC
• KT-57223 K2: false-negative INAPPLICABLE_JVM_NAME on non-final properties outside interfaces
• KT-59413 K2: Missing VALUE_CLASS_CANNOT_HAVE_CONTEXT_RECEIVERS
• KT-59387 K2: Missing NO_CONSTRUCTOR
• KT-57803 K2. "Kotlin: Only the Kotlin standard library is allowed to use the 'kotlin' package" error missing in 2.0

IDE

Fixes

• KT-62777 K2 IDE: False positive MISSING_DEPENDENCY_SUPERCLASS for built-ins in non-JVM modules
• KT-61195 UAST modeling of implicit it is inconsistent for Enum.entries
• KT-62757 SLC: incorrect nullability annotation on aliased type
• KT-60318 K2: disable SLC for non-JVM platforms
• KT-62440 On the fly resolve with light method context doesn't resolve method type parameters
• KT-50241 Make Symbol Light Classes consistent with Ultra Light Classes
• KT-56546 LL FIR: fix lazy resolve contract violation in Symbol Light Classes
• KT-57550 K2: AA: incorrect constant value in file-level annotation
• KT-61460 SLC: unnecessary upper bound wildcards (w/ type alias)
• KT-61377 K2: SLC: wrong retention counterpart for AnnotationRetention.BINARY
• KT-60603 K2: Investigate intellij tests failures in branch 2.0
• KT-60590 Fix light classes related tests in branch 2.0

IDE. Gradle Integration

• KT-45775 Improve quality of Import

IDE. Multiplatform

• KT-63007 K2: Analysis API Standalone: klibs are not resovled from common code
• KT-61520 Sources.jar is not imported for common and intermediate source-sets from the MPP library

IDE. Script

• KT-60418 K2 scripting: highlighting sometimes fails
• KT-60987 K2: Analysis API: make build.gradle.kts resolution work on build scripts from kotlin projects

IR. Actualizer

• KT-62623 K2: Ir actualizer leaves inconsistent module links from files

IR. Tree

• KT-61934 Decouple building fake overrides from symbol table and build scheduling
• KT-60923 IR: Mark IrSymbol.owner with OptIn

JavaScript

• KT-61795 KJS: Incremental Cache is not invalidated if useEsClasses compiler argument was changed
• KT-62425 K/JS: Implement K2 and K1 diagnostics for checking argument passing to js()
• KT-58685 KJS: "IllegalStateException: Not locked" cused by "unlock" called twice
• KT-56818 KJS: "TypeError: Class constructor * cannot be invoked without 'new'" when extending external class
• KT-61710 K/JS: Implement JS_NAME_CLASH check for top level declarations
• KT-61886 K/JS: Prepare K/JS tests for JS IR BE diagnostics
• KT-60829 Fix JS Incremental tests in 2.0 branch
• KT-60785 KJS: Destructured value class in suspend function fails with Uncaught TypeError: can't convert to primitive type error
• KT-60635 K/JS: Class internal methods may clash with child methods from other module that have the same name
• KT-60846 Fix IncrementalJsKlibCompilerWithScopeExpansionRunnerTestGenerated test in 2.0 branch

KMM Plugin

• KT-60169 Generate gradle version catalog in KMM AS plugin
• KT-59269 Update wizards in KMM AS plugin after 1.9.0 release

Klibs

• KT-61767 [K/N] Header klibs should keep private underlying properties of value classes
• KT-60807 [klib] Add an option to write out header klibs
• KT-61097 [PL] Don't create an executable if there were errors in PL

Language Design

• KT-58921 K1/K2: difference in Enum.values resolve priority
• KT-61573 Emit the compilation warning on expect/actual classes. The warning must mention that expect/actual classes are in Beta
• KT-62138 K1: false positive (?) NO_SET_METHOD for += resolved as a combination of Map.get and plus
• KT-22841 Prohibit different member scopes for non-final expect and its actual

Libraries

• KT-62785 Drop unnecessary suppresses in stdlib after bootstrap update
• KT-58588 Optimizations for sequence functions distinct, flatten
• KT-62004 Drop legacy JS compilations of stdlib and kotlin-test
• KT-61614 WASM: Enum hashCode is not final

Native

• KT-61642 [K/N] Serialize full IdSignatures to caches
• KT-62803 Konanc has print statement "Produced library API in..." that should be deleted or properly logged at INFO level
• KT-61248 [K/N] Extract native manglers out of backend.native module

Native. Runtime. Memory

• KT-57773 Kotlin/Native: track memory in big chunks in the GC scheduler
• KT-61093 Kotlin/Native: enable concurrent weak processing by default

Native. Stdlib

• KT-60514 Add llvm filecheck tests for atomic intrinsics

Native. Testing

• KT-62157 Native: Migrate FileCheck tests to new native test infra

Reflection

• KT-60984 K2: java.lang.ClassNotFoundException: kotlin.Array in runtime with Spring Boot test
• KT-60709 Reflection: Not recognized bound receiver in case of 'equals' always returning true
• KT-61304 Reflection: Calling data class copy method via reflection (callBy) fails when the data class has exactly 64 fields

Tools. CLI

• KT-62644 Don't enable in progressive mode bug-fix features without target version
• KT-62350 CLI: no color output on Apple silicon Macs
• KT-61156 K2: do not try to run compilation if there were errors during calculation of Java module graph
• KT-48026 Add the compiler X-flag to enable self upper bound type inference

Tools. Compiler Plugin API

• KT-61872 K2: Adding annotations to metadata from backend plugin doesn't work in the presence of comments on annotated declaration

Tools. Compiler Plugins

• KT-60849 jvm-abi-gen: do not treat hasConstant property flag as a part of ABI for non-const properties
• KT-53926 K2. Don't check serializable properties from supertypes

Tools. Compiler plugins. Serialization

• KT-62215 Serialization / Native: "IllegalArgumentException: No container found for type parameter" caused by serializing generic classes with a field that uses generics
• KT-62522 K2 + kotlinx.serialization + Native: NPE when generic base class has inheritor in other module

Tools. Gradle

New Features

• KT-59627 FUS base plugin
• KT-62025 K/Wasm: Support binaryen for wasi

Performance Improvements

• KT-62318 Android Studio sync memory leak in 1.9.20-Beta

Fixes

• KT-62650 Gradle: Return the usage of kotlin-compiler-embeddable back
• KT-61295 KotlinTestReport captures Project.buildDir too early
• KT-62987 Add tests for statistics plugin in Aggregate build
• KT-62964 Build Gradle plugin against Gradle 8.4 API
• KT-61896 Gradle: compilation via build tools API doesn't perform Gradle side output backups
• KT-61918 Removal of an associated compilation from a build script doesn't lead to full recompilation
• KT-59826 Update SimpleKotlinGradleIT#testProjectIsolation to run on Gradle 8
• KT-61401 The reported language version value for KotlinNativeLink tasks in build reports and build scans is inaccurate
• KT-62024 K/Wasm: Binaryen modifying compiler output
• KT-61950 K/Wasm: Add warning about changed sourceSets
• KT-61895 KotlinTopLevelExtension.useCompilerVersion is not marked as experimental
• KT-56574 Implement a prototype of Kotlin JVM compilation pipeline via the build tools API
• KT-61206 Build system classes may leak into the Build Tools API classloader
• KT-61737 GradleStyleMessageRenderer.render misses a space between the file and the message when location is (line:column = 0:0)
• KT-61457 Kotlin Gradle Plugin should not use internal deprecated StartParameterInternal.isConfigurationCache

Tools. Gradle. JS

• KT-41382 NI / KJS / Gradle: TYPE_MISMATCH caused by compilations.getting delegate
• KT-53077 KJS / Gradle: Remove redundant gradle js log on kotlin build
• KT-61992 KJS / Gradle: KotlinJsTest using KotlinMocha should not show output, and should not run a dry-run every time.
• KT-56300 KJS / Gradle: plugin should not add repositories unconditionally
• KT-55620 KJS / Gradle: plugin doesn't support repositoriesMode
• KT-56465 MPP: Import with npm dependency fails with "UninitializedPropertyAccessException: lateinit property fileHasher has not been initialized" if there is no selected JavaScript environment for JS target
• KT-41578 Kotlin/JS: contiuous mode: changes in static resources do not reload browser page

Tools. Gradle. Kapt

• KT-22261 Annotation Processor - in gradle, kapt configuration is missing extendsFrom
• KT-62518 kapt processing is skipped when all annotation processors are indirect dependencies

Tools. Gradle. Multiplatform

• KT-62601 AS/IntelliJ exception after updating a KMP project with a macos target to Kotlin 1.9.20-RC
• KT-60734 Handle the migration from ios shortcut and source set with getting
• KT-59042 "Cannot build 'KotlinProjectStructureMetadata' during project configuration phase" when configuration cache enabled
• KT-62029 Kotlin 1.9.20-Beta fails to detect some transitive dependency references in JVM+Android source set
• KT-61652 MPP ConcurrentModificationException on transformCommonMainDependenciesMetadata
• KT-61622 Upgrading to Kotlin 1.9 prevents commonMain sourceset classes from being processed by kapt/ksp (dagger/Hilt)
• KT-61540 K2: KMP/K2: Metadata compilations: Discriminate expect over actual by sorting compile path using refines edges
• KT-59020 1.9.0 Beta Kotlin plugin Gradle sync fails with intermediate JVM + Android source set
• KT-60860 K2: Fix KotlinNativeCompileArgumentsTest in 2.0 branch
• KT-61463 KMP: Remove unused 'kpm' code

Tools. Gradle. Native

• KT-51553 Migrate all Kotlin Gradle plugin/Native tests to new test DSL and add CI configuration to run them
• KT-61657 KonanTarget should implement equals or custom serialization
• KT-62907 Turn on downloading Kotlin Native from maven by default
• KT-61700 Native: linkDebugExecutableNative has duplicated freeCompilerArgs

Tools. Incremental Compile

• KT-61865 Add support for incremental compilation within the in-process execution strategy in the build tools api
• KT-61590 K2/KMP: Expect actual matching is breaking on the incremental compilation
• KT-60831 Fix IncrementalMultiplatformJvmCompilerRunnerTestGenerated in 2.0 branch

Tools. JPS

• KT-60737 Investigate/fix JPS-related tests in 2.0 migration branch

Tools. Kapt

• KT-60507 Kapt: "IllegalAccessError: superclass access check failed" using java 21 toolchain
• KT-62438 Change experimental K2 kapt diagnostic message
• KT-61916 K2 KAPT. Kapt doesn't generate fully qualified names for annotations used as arguments to other annotations
• KT-61879 K2 Kapt: java.lang.NoSuchMethodError during stub generation
• KT-61729 K2: KAPT 4: Compiler crash during compilation of Sphinx for Android
• KT-61333 K2 Kapt: support REPORT_OUTPUT_FILES compiler mode
• KT-61761 Kapt4ToolIntegrationTestGenerated should not use Kapt3ComponentRegistrar

Tools. Maven

• KT-54868 Stop publishing kotlin-archetype-js
• KT-26156 Maven Kotlin Plugin should not WARN when no sources found
• KT-60859 K2: Fix maven IncrementalCompilationIT tests in 2.0 branch

Tools. Parcelize

• KT-57685 Support ImmutableCollections in Parcelize plugin

Tools. Scripts

• KT-62400 K2: Missing annotation resolving for scripts
• KT-61727 Scripts: Maven artifacts resolution is slow

Tools. Wasm

• KT-61973 K/Wasm: wasmWasiNodeRun is missed
• KT-61971 K/Wasm: wasmWasiTest should depends on kotlinNodeJsSetup

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