2.0.0-Beta2

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/ 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: ” 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()

2.0.0-Beta1

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

1.9.21

Compiler

• KT-62885 Introduce a language feature entry for expect actual classes for easier configuration of MPP projects
• KT-63081 Optimize new native caches: CachedLibraries.computeVersionedCacheDirectory()

Docs & Examples

• KT-55619 Document String.format function

IDE. Gradle Integration

• KT-62877 Artifact files collecting for project configuration was finished. Resolution for configuration configuration X will be skipped

IDE. Gradle. Script

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

JavaScript

• KT-60785 KJS: Destructured value class in suspend function fails with Uncaught TypeError: can't convert to primitive type error
• KT-63207 KMP / JS: “TypeError: <mangled_name> is not a function” with 1.9.20
• KT-62778 package.json “main” field has .js extension when the result files have .mjs extension
• KT-61795 KJS: Incremental Cache is not invalidated if useEsClasses compiler argument was changed
• KT-61957 KJS: “Uncaught ReferenceError: entries is not defined” caused by enum class with @JsExport and Enum.entries call
• KT-62444 KJS with commonJS modules should re-export in 1.9.20
• KT-63184 KJS / Serialization: JsExport on serializable interface creates erroneous TypeScript
• KT-62190 KJS: “IllegalStateException: Expect to have either super call or partial linkage stub inside constructor” caused by Compose and useEsModules()
• KT-58685 KJS: “IllegalStateException: Not locked” cused by “unlock” called twice

Klibs

• KT-62515 Interop klib of concurrent version is not accepted when building dependent project: “The library versions don't match”

Tools. CLI

• KT-63139 Incorrect kotlin implementation version (1.9.255-SNAPSHOT) in metadata info

Tools. Gradle

• KT-63499 Gradle: Source sets conventions are still registered

Tools. Gradle. JS

• KT-59523 MPP / KJS: ESM modules uses incorrect file extension on package.json (.mjs)

Tools. Gradle. Kapt

• KT-63366 Kapt processing fails with custom source sets

Tools. Gradle. Multiplatform

• KT-32608 Create JUnit-XML result file in multiplatform gradle build
• 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-63044 KGP: Multiplatform - 8.4 configuration cache support
• KT-63011 Apple Framework Artifacts is not connected to KotlinNativeTask
• KT-62601 AS/IntelliJ exception after updating a KMP project with a macos target to Kotlin 1.9.20-RC

Tools. Incremental Compile

• KT-61590 K2/KMP: Expect actual matching is breaking on the incremental compilation

Tools. JPS

• KT-63594 ClassCastException in JPS statistics
• KT-63651 Fix NPE in Kotlin JPS after enabling graph implementation of JPS

Tools. Kapt

• KT-57389 KAPT3 uses a Javac API for JCImport which will break in JDK 21
• KT-60507 Kapt: “IllegalAccessError: superclass access check failed” using java 21 toolchain

Tools. Scripts

• KT-54819 Scripts: Not able to use slf4j in .main.kts
• KT-61727 Scripts: Maven artifacts resolution is slow

1.9.20

Analysis. API

New Features

• KT-58834 Analysis API: Add source shadowing feature to resolve extensions

Performance Improvements

• KT-57515 LL FIR: Performance bottleneck in CompositeModificationTracker.getModificationCount
• KT-59266 K2: optimize FirElementBuilder.getOrBuildFir for elements outside body
• KT-59454 K2: drop resolve from org.jetbrains.kotlin.analysis.api.fir.components.KtFirVisibilityChecker#collectContainingDeclarations
• KT-59453 K2: completion regression from org.jetbrains.kotlin.analysis.api.fir.components.KtFirVisibilityChecker#collectContainingDeclarations
• KT-59189 Analysis API: KtFirKDocReference.resolveToSymbols is slow
• KT-58125 K2: LL FIR: KtToFirMapping.getElement is slow for KtUserTypes due to on-air resolution of types

Fixes

• KT-59240 K2: FirLazyResolveContractViolationException: lazyResolveToPhase(IMPORTS) cannot be called from a transformer with a phase IMPORTS from superTypes
• KT-58499 K2: FirLazyBlock should be calculated before accessing
• KT-57966 K2: Analysis API: Reference Shortener does not work correctly when called on entire file
• KT-60954 K2: Analysis API: Reference shortener does not work correctly with variable assignments
• KT-60940 K2: Analysis API: Reference shortener incorrectly handles types in vararg parameters declarations
• KT-60488 Analysis API: forbid providing custom KtLifetimeToken for every analyze call
• KT-60728 K2: proper support for scripts in LL FIR transformers
• KT-59159 K2 IDE: declaration is not found exception
• KT-59297 K2: exception from body resolve leads to corrupted state and broken analysis
• KT-59077 KtFirExpressionTypeProvider behaviour for KtSimpleNameReferences in function calls
• KT-60586 K2: forbid analyze from write action
• KT-57743 K2 IDE: StackOverflowError from LLFirSessionCache for simple JPS project with cyclic dependencies
• KT-61026 K2 Scripts: FirLazyExpression should be calculated before accessing from on-air resolve
• KT-61009 K2 Scripts: KtFirExpressionTypeProvider: Expected FirResolvedTypeRef with ConeKotlinType but was FirImplicitTypeRefImplWithoutSource
• KT-60357 K2 IDE. Reified types parameters are not resolved in a function body
• KT-60317 K2 IDE. IAE “This method will only work on compiled declarations, but this declaration is not compiled” on invoking Find Usages for enum method in library
• KT-60706 K2 IDE: FirJvmTypeMapper is not found for kotlin.kotlin-stdlib-common
• KT-60552 K2: merge StateKeeper and lazy body calculator for ANNOTATIONS_ARGUMENTS_MAPPING transformer
• KT-60641 Analysis API: Scope for class org.jetbrains.kotlin.fir.types.impl.ConeClassLikeTypeImpl not found exception when stdlib is missing
• KT-60638 K2: Expected FirResolvedTypeRef with ConeKotlinType but was FirImplicitTypeRefImplWithoutSource
• KT-54846 Analysis API: add isExpect/isActual to KtSymbol
• KT-60448 FirLazyResolveContractViolationException: lazyResolveToPhase(COMPILER_REQUIRED_ANNOTATIONS) cannot be called from a transformer with a phase COMPILER_REQUIRED_ANNOTATIONS from AllOpen plugin
• KT-59342 K2 IDE. FirLazyResolveContractViolationException: lazyResolveToPhase(TYPES) cannot be called from a transformer with a phase TYPES
• KT-59687 K2: Implement proper body update for in-block modifications
• KT-59329 Resolve Extensions reference resolution breaks Find Usages
• KT-60295 K2: move checkIsResolved for annotations from LLFirAnnotationArgumentsLazyResolver to LLFirTypeLazyResolver
• KT-59758 K2: Expected is FirResolvedTypeRef, but was FirImplicitTypeRefImplWithoutSource from ReturnTypeCalculatorWithJump
• KT-60377 K2 IDE: This method will only work on compiled declarations, but this declaration is not compiled
• KT-59685 K2: rewrite on-air resolution
• KT-60132 K2: properties and functions without a name should be re-analyzable as well
• KT-59199 K2 IDE: PSI changes which do not cause OOB modifications can be unseen from the FIR elements
• KT-59667 Analysis API: PsiInvalidElementAccessException from JavaClassifierTypeImpl.substitutor
• KT-59705 KotlinExceptionWithAttachments: No fir element was found for getter
• KT-59697 AA standalone: JRT module paths are not properly populated in Windows
• KT-59505 K2: implicit type lazy resolution doesn't work for delegated declaration from other module
• KT-56426 K2 IDE: Typealised functional types cannot be rendered
• KT-59598 AA: stackoverflow while simplifying a type with a recursive type parameter
• KT-58497 K2: Expected FirResolvedTypeRef for initializer type of FirPropertyImpl(Source) but FirImplicitTypeRefImplWithoutSource found
• KT-59511 AA standalone mode creates Application Environment for tests
• KT-58161 Analysis API: Make methods in KtCallResolverMixIn more distinctive based on their receiver/return type
• KT-59093 Do not throw exception on KtCall resolution, KtCallElement.resolveCall should return null on unknown cases
• KT-59243 K2: FirLazyResolveContractViolationException: lazyResolveToPhase(IMPORTS) cannot be called from a transformer with a phase IMPORTS from permits types
• KT-58194 K2: Low Level API: use smart pointers to store references to PSI from FIR declarations for JavaElement
• KT-59133 K2: java.lang.IllegalStateException: Fir is not initialized for FirRegularClassSymbol
• KT-58174 K2: LL FIR: Invalid type reference for T & Any type
• KT-52615 LL FIR: build RAW FIR only by stubs
• KT-55053 K2: Exception “lateinit property diagnostic has not been initialized” in FirBuilder
• KT-58580 K2: LL FIR: Declarations provided by resolve extensions from a dependency module are not visible through LLFirCombinedKotlinSymbolProvider
• KT-58992 Analysis API: move org.jetbrains.kotlin.analysis.api.fir.utils.addImportToFile out of Analysis API
• KT-58727 K2: AA FIR: implicit type in delegated function treated as error
• KT-58653 K2: Analysis API: add functions for KtScope members access by name
• KT-57559 K2 IDE: KotlinExceptionWithAttachments: Modules are inconsistent on intellij project
• KT-58262 Analysis API: Declarations from Analysis API Resolve Extensions are not seen from completion
• KT-57455 LL FIR: Combine AbstractFirDeserializedSymbolProviders in session dependencies (optimization)
• KT-57207 LL FIR: Combine JavaSymbolProviders in session dependencies (optimization)
• KT-58546 K2: LL FIR: support name collision in a designation path
• KT-58495 K2: Lazy calculation is redundant
• KT-58500 K2: null cannot be cast to non-null type org.jetbrains.kotlin.fir.FirPureAbstractElement
• KT-58493 K2: Expected FirResolvedTypeRef for default value type of FirValueParameterImpl(Source) but FirUserTypeRefImpl found
• KT-58496 K2: Expected FirNamedReference, FirErrorNamedReference or FirFromMissingDependenciesNamedReference, but FirExplicitSuperReference found
• KT-58491 K2: Expected FirResolvedTypeRef or FirImplicitTypeRef for return type of FirDefaultPropertyBackingField(Synthetic) but FirUserTypeRefImpl found
• KT-56550 LL FIR: implement parallel resolve for non-jumping phases
• KT-58503 Analysis API: KtFirNamedClassOrObjectSymbol.visibility/modality do not trigger STATUS resolve
• KT-57623 K2 IDE: ConcurrentModificationException from getSuperConeTypes
• KT-58083 K2: LL FIR: implement FakeOverrideTypeCalculator

Android

• KT-27170 Android lint tasks fails in Gradle with MPP dependency

Backend. Native. Debug

• KT-61131 Virtual functions trampolines have invalid debug info

Backend. Wasm

Fixes

• KT-60244 K/Wasm: make the compiler compatible with Wasm GC phase 4 (Final) specification
• KT-61262 K/Wasm: add a way to turn on k2 in wasm examples that don't use compose
• KT-61343 K/Wasm: add a wasi example to kotlin-wasm-examples
• KT-62147 [Kotlin/Wasm] Nothing typed when expression cause a backend error
• KT-59720 K/Wasm: update to final opcodes
• KT-60834 K/Wasm: investigate consequences of stopping using br_on_cast_fail
• KT-59294 WASM: localStorage Cannot read properties of undefined (reading ‘length’)
• KT-60835 K/Wasm: fix compatibility with Node.js 20.*
• KT-60113 K/Wasm: illegal cast when using 1.9.20-dev
• KT-60496 Compose-web Wasm crashes on remember { null } calls
• KT-58746 K/Wasm: Make Arrays' constructors with size and lambda inline (similar to other implementations)
• KT-58993 [K/Wasm] Fix w3c declarations with lambda parameters
• KT-59722 K/Wasm: Support new encoding with flags for br_on_cast and br_on_cast_fail instructions
• KT-59713 K/Wasm: Implement enumEntries intrinsic
• KT-59082 WASM: NullPointerException caused by companion with String type constants
• KT-58941 WASM Hang with extension delegate inside a Class
• KT-60200 K/Wasm: generate types without supertypes properly
• KT-52178 IR dump doesn't seem to work for Kotlin/WASM phases
• KT-59556 Wasm: critical dependency when using with webpack
• KT-58681 K/Wasm: division remainder has a wrong sign
• KT-56711 Wasm: IllegalStateException caused by dynamic type

Compiler

New Features

• KT-58551 KMP: check all annotation from expect declaration are present on actual
• KT-58554 KMP: restrict expect opt-in annotations and actual typealiases to annotations with special meaning
• KT-58545 KMP: prohibit implicit actualization via Java
• KT-58536 KMP: prohibit expect tailrec / expect external
• KT-59764 Make a frontend checker that reports cast to forward declaration as unchecked
• KT-60528 Updates for JVM/IR backend of kotlin-atomicfu-compiler-plugin
• KT-59558 Add support for creating annotation instances with type parameters
• KT-52367 Devirtualization algorithm improvement
• KT-58652 Native: Implement frontend checkers for HiddenFromObjC on classes

Performance Improvements

• KT-59600 K2: CFG: do not add edges to nested classes and functions
• KT-57860 K/N: Functions with default arguments of value/inline class types have poor performance due to value class boxing

Fixes

• KT-60387 K2: IDE K2: “org.jetbrains.kotlin.fir.expressions.impl.FirArgumentListImpl cannot be cast to class org.jetbrains.kotlin.fir.expressions.impl.FirResolvedArgumentList”
• KT-61228 False positive MUST_BE_INITIALIZED_OR_FINAL_OR_ABSTRACT_WARNING for effectively final properties
• KT-61643 “Argument type mismatch” for mixed Java/Kotlin Project with Java 21
• KT-62389 JDK 21: Cannot access class ‘TimeUnit’. Check your module classpath for missing or conflicting dependencies
• KT-56768 K2. No error description on incomplete try catch declaration
• KT-52220 FIR + LightTree - Consider building a single tree on parsing into LightTree
• KT-60601 K2 / Maven: Overload resolution ambiguity between candidates inline method
• KT-62027 “java.lang.IndexOutOfBoundsException: Empty list doesn't contain element at index 0” caused by ClassicExpectActualMatchingContext.kt when annotation @AllowDifferentMembersInActual used
• KT-62747 Wrong warning message when overriding vararg with Array during actualization
• KT-62655 Don't report a warning when new members and new supertypes are added to open expect actualization
• KT-62313 Kotlin/Native Compiler crash: ClassCastException in IntrinsicGenerator
• KT-60902 visibility vs upper bound expect actual matching conflict
• KT-61095 K2: “IAE: source must not be null” from FirMultipleDefaultsInheritedFromSupertypesChecker
• KT-47567 ‘Val cannot be reassigned’ error not reported in unreachable code
• KT-59468 K2: build realm-kotlin
• KT-62026 KMP: Correctly handle a case when annotation on expect declaration is unresolved
• KT-59476 K2: build ClashForAndroid
• KT-59487 K2: build KSP-playground
• KT-47409 K1/K2: Investigate and align inference for equality (==) operator
• KT-59393 K2: Missing TYPE_ARGUMENTS_FOR_OUTER_CLASS_WHEN_NESTED_REFERENCED
• KT-62127 “NoSuchFieldError: TRUE$delegate” on referencing companion's variable in submodule
• KT-62335 Improve debuggability of code generator crashes
• KT-61165 More than one overridden descriptor declares a default value for ‘cause: Throwable?’. As the compiler can not make sure these values agree, this is not allowed
• KT-62263 Turn “different expect/actual members” error into a warning
• KT-59969 K2: Disappeared UNSUPPORTED_CONTEXTUAL_DECLARATION_CALL
• KT-61616 K2: IrBuiltIns.extensionToString fails during native compilation
• 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-61924 Native: problem with abstract fake override from Any
• KT-61933 K2: “Argument type mismatch: actual type is 'Foo<kotlin/Function0<kotlin/Unit>>' but 'Foo<kotlin/coroutines/SuspendFunction0<kotlin/Unit>>' was expected”
• KT-59471 K2: build multiplatform-settings
• KT-56077 K2: build kotlinx.atomicfu
• KT-59465 K2: build kotlinx-datetime
• KT-60824 K2 IDE: FirSyntheticCallGenerator: IAE: List has more than one element
• KT-61856 K2: “KotlinIllegalArgumentExceptionWithAttachments” on usage of javax.validation.constraints.Email.List
• KT-54792 Store program order of properties inside @kotlin.Metadata
• KT-56083 K2: build ktor
• KT-23861 Expect annotation should not be applicable wider than the actual one
• KT-59466 K2: build kotlinx-benchmark
• KT-60830 KMP, K2: expect actual annotation IR checker doesn't unwrap actual typealiases to annotations
• KT-61668 Put expect/actual diagnostics introduced in 1.9.20 release under 1.9 Language Version
• KT-61725 KMP: Annotation matching requirement for expect/actual leads to errors for annotations with @OptionalExpectation
• KT-47892 False negative BREAK_OR_CONTINUE_OUTSIDE_A_LOOP with continue in init block inside for
• KT-61784 KMP: [DEFAULT_ARGUMENTS_IN_EXPECT_WITH_ACTUAL_TYPEALIAS] checker missed for companion functions
• KT-61173 K2: FirProperty.hasBackingField is true for an expect val
• KT-59743 K2: erroneous binding of typealias with two type parameters to a class with one type parameter
• KT-60650 KMP: prohibit problematic actual typealiases
• KT-61461 K2: Kotlin native metadata compilation breaks when stdlib is present in -libraries
• KT-61270 Enabling Kotlin/Native caching causes 65K warnings from dsymutil when building Compose iOS app
• KT-58229 K2/MPP/JVM: compiler codegen crash on call of inherited generic class's method with actual-typealias as value parameter
• KT-47702 Support call of Java annotation constructor without specifying a default value
• KT-56460 K2: Do not re-run DiagnosticCollectorVisitor from FirInlineDeclarationChecker.checkChildrenWithCustomVisitor
• KT-55933 K2: False negative Overload resolution ambiguity for call functions with named parameters if one of params is vararg
• KT-59548 FIR2IR: inconsistent generation of dispatch receiver for object methods
• KT-55072 K2: False positive “suspension point is inside a critical section”
• KT-58778 JVM IR inline: add fake variables for debugger
• KT-59404 K2: Missing EXPECT_TYPE_IN_WHEN_WITHOUT_ELSE
• KT-59830 K2. False negative [FINAL_SUPERTYPE] on extending final class through type alias
• KT-60580 K2: Not supported: class org.jetbrains.kotlin.fir.types.ConeFlexibleType
• KT-59391 K2: Missing JS_BUILTIN_NAME_CLASH
• KT-59392 K2: Missing NAME_CONTAINS_ILLEGAL_CHARS
• KT-58360 Intrinsics for atomic update of array elements
• KT-59165 K2: Prohibit class literals with empty left-hand side
• KT-60427 K2 @Metadata annotations contain outerType/outerTypeId information for non-inner nested classes
• KT-59376 K2: Missing TYPECHECKER_HAS_RUN_INTO_RECURSIVE_PROBLEM_ERROR
• KT-55221 K2: No error reported for self-referencing local function with inferred return type
• KT-59586 K2: support JVM backend diagnostics in light tree mode
• KT-57780 K2: Calling a constructor through a deprecated typealias doesn't report a deprecation
• KT-59110 K2. “NotImplementedError: An operation is not implemented.” error on incorrect @Target annotation
• KT-59249 K2: Empty varargs are not serialized to KLIB
• KT-55373 K2. Unresolved reference error for type mismatch with callable references
• KT-55955 K2: callable references are not properly resolved when in conflict with expected type
• KT-60144 JVM IR inline: backport primitive boxing in class literals
• KT-60779 K2: missing INTERFACE_CANT_CALL_DEFAULT_METHOD_VIA_SUPER
• KT-60587 K2: Implement warning NO_REFLECTION_IN_CLASS_PATH
• KT-61145 False negative NOTHING_TO_OVERRIDE when context receivers don't match
• KT-59378 K2: Missing FINITE_BOUNDS_VIOLATION and FINITE_BOUNDS_VIOLATION_IN_JAVA
• KT-61163 Default params on actual check and inheritance by delegation compilation error
• KT-60800 [atomicfu-K/N]: turn on the tests for the K/N part of the compiler plugin
• KT-61029 K2: Duplicates when processing direct overridden callables
• KT-55196 K2: False-negative CONST_VAL_WITH_NON_CONST_INITIALIZER on boolean .not() call
• KT-60862 Kotlin Scripting: NoSuchMethodError for ExternalDependenciesResolver.addRepository
• KT-57963 K2: MPP: Annotation calls should be actualized
• KT-60854 K2: IrActualizer incorrectly generates fake overrides for synthetic java properties
• KT-59665 ACTUAL_FUNCTION_WITH_DEFAULT_ARGUMENTS isn't reported for actual typealias and fake-override actualization
• KT-61039 False positive ABSTRACT_MEMBER_NOT_IMPLEMENTED in K1 when expect actual super types scopes don't match
• KT-61166 Inherited platform declaration clash & accidental override
• KT-60531 K2/JS: Report diagnostics before running FIR2IR
• KT-32275 Embedding kotlin-compiler-embeddable into a Java EE App leads to CDI related deployment error
• KT-57845 K2. Unresolved reference error on calling Java references with fully qualified name
• KT-58757 K2: False-positive NON_PUBLIC_CALL_FROM_PUBLIC_INLINE error in case an inline fun is protected and is a part of an internal abstract class declaration
• KT-59736 kotlinx.serialization + K2 + JS: e: java.lang.IllegalStateException: Symbol for kotlinx.serialization.json.internal/FormatLanguage.|-547215418288530576[1] is unbound
• KT-59071 K2/MPP: internal declarations from common module are invisible in dependent source sets if there is more that one intermediate source set between
• KT-61167 Runtime failure: ReferenceError: MyPromise is not defined
• KT-59408 K2: Missing MULTIPLE_DEFAULTS_INHERITED_FROM_SUPERTYPES
• KT-61409 Kotlin/Native: crash in kmm-production-sample (compose-app) with escape analysis enabled
• KT-57329 K/N IR linkage issues due to the combination of static caches w/ Lazy IR & Compose compiler plugin
• KT-59247 Kapt+JVM_IR: AssertionError on anonymous object in enum super constructor call
• KT-58576 K2: IR actualization problems in MPP scenario
• KT-61442 K2: Consider stricter filtering on implicit integer coercion
• KT-61441 K2: Wrong overload is chosen with ImplicitIntegerCoercion enabled
• KT-59328 K2: property with compound getter and without explicit type: compilation failure, IAE “List has more than one element” at FirDeclarationsResolveTransformer.transformFunctionWithGivenSignature()
• KT-61159 K2: OVERLOAD_RESOLUTION_AMBIGUITY between private top-level property in same file and top-level property in different module
• KT-59233 K2: false-negative diagnostic on creating a callable reference to a function with free type variables
• KT-61418 k2: ImplicitIntegerCoercion to List leads to “IllegalStateException: Cannot find cached type parameter by FIR symbol”
• KT-61373 False positive: “The opt-in annotation is redundant: no matching experimental API is used” with multiplatform code.
• KT-58884 K2: NotAMockException for mock testing with lambda expression with Maven
• KT-58893 K2: MockitoException for mock testing with lambda expression with Gradle
• KT-59483 K2: Build a Native app
• KT-57738 K2: unresolved class fields and methods in kotlin scripts
• KT-59449 K2: Diagnostic messages contain debugging-style rendered FIR
• KT-59849 K2: IllegalArgumentException: List has more than one element
• KT-57553 Implement deprecation for open val with backing field and deferred initialization in K1
• KT-57230 Support Kotlin/Wasm in the K2 platform
• KT-59409 K2: Missing DEFAULT_VALUE_NOT_ALLOWED_IN_OVERRIDE
• KT-59058 Companion object is not initialized on class constructor call
• KT-61017 K2: intermediate expect/actual class results in expected class has no actual declaration in module
• KT-60181 K2: “NotImplementedError: An operation is not implemented” with Spring
• KT-59472 K2: build Reaktive
• KT-54786 MPP: “LazyTypeAliasDescriptor cannot be cast to class org.jetbrains.kotlin.descriptors.ClassDescriptor” caused by expected non-constant function argument on iOS if class is type aliased
• KT-59753 K2: NotImplementedError when using annotation with vararg with default value from other module
• KT-60883 K2: Fix testRequireKotlinCompilerVersion in LV 2.0 branch
• KT-59747 K2: cannot actualize expect class to Unit via typealias
• KT-61054 K2: “IAE: source must not be null” with -no-reflect on calling property getter with implicit invoke
• KT-57126 [KLIB Reproducibility] Manifest is written using os-dependent line separators
• KT-60850 K2: FIR2IR generates incorrect signature for fake overrides for common declaration if it called from a platform module
• KT-59218 K2: return types of calls to @PolymorphicSignature methods inside try-expressions don't resolve to void when required
• KT-60002 K2: Missing UNSUPPORTED_SUSPEND_TEST
• KT-61011 K2 Scripts: FirRecursiveProblemChecker: Expected FirResolvedTypeRef with ConeKotlinType but was FirImplicitTypeRefImplWithoutSource
• KT-58906 K2. “Backend Internal error: Exception during IR lowering” instead of CANNOT_INFER_PARAMETER_TYPE error when parameter type missing in lambda
• KT-59490 K2: build km-shop
• KT-60163 K2: vararg annotation argument value is serialized not as an array
• KT-59355 K2: Allow to actual classifier have wider visibility than the corresponding expect class
• KT-56179 [K2/N] interop_objc_tests/multipleInheritanceClash.kt test failed
• KT-59411 K2: Missing ENUM_CLASS_CONSTRUCTOR_CALL
• KT-59410 K2: Missing TYPEALIAS_EXPANDED_TO_MALFORMED_TYPE
• KT-59382 K2: Missing PROTECTED_CONSTRUCTOR_NOT_IN_SUPER_CALL
• KT-59901 K2: Disappeared API_NOT_AVAILABLE
• KT-60474 K2: False negative type mismatch for array literal with wrong numeric literal
• KT-59610 K2: Calls to annotations with default values are serialized differently in K1 and K2
• KT-60139 K2: Refactor handling of implicitly actual declarations (annotation & inline class constructors and property of inline class)
• KT-60793 K2: IllegalStateException: Expected FirResolvedTypeRef with ConeKotlinType but was FirJavaTypeRef
• KT-60735 K2: lateinit property diagnostic has not been initialized
• KT-60137 K2: Quite complicated redeclaration error description is displayed for data classes
• KT-60639 K2: IllegalStateException: Unsupported compile-time value GET_CLASS type=kotlin.reflect.KClass<p1.A>
• KT-56888 CFA: Valid green in K1 -> red in K2. catch_end -> finally -> after_try
• KT-60723 K2: Nested finally block has extra jump edge if surrounding try block jumps
• KT-60573 K2: False positive/negative CONFLICTING_OVERLOADS for main functions
• KT-60124 K2: Conflicting declarations on extension properties with different upper-bounded type parameter
• KT-60259 K2: Reflection target is missing on adapted function refernces
• KT-59036 InstantiationError when instantiating annotation with a parameter type as a default parameter of another annotation
• KT-59094 K2: Fix Scripting K2 tests
• KT-59711 K/N: Implement enumEntries intrinsic
• KT-59748 K2: Return type mismatch: expected Unit, actual Any? for when with an assignment in branch
• KT-60154 K2: Expected some types error
• KT-58139 K2/MPP/metadata: compiler FIR serialization crash on complex expression as annotation argument
• KT-59485 K2: build Anki-Android
• KT-59415 K2: Missing DATA_CLASS_OVERRIDE_DEFAULT_VALUES_ERROR
• KT-59710 K/JVM: Implement enumEntries intrinsic
• KT-57984 K2/JS fails with IdSignature clash for inherited expect/actual function
• KT-59398 K2: Missing NOT_SUPPORTED_INLINE_PARAMETER_IN_INLINE_PARAMETER_DEFAULT_VALUE
• KT-60645 Native: dynamic caches are broken on Linux
• KT-50221 FIR: handle enhanced/flexible nullability inside withNullability properly
• KT-59281 JVM IR inline: incorrect type of created array
• KT-59507 JVM IR inline: invocation of arrayOfNulls by function reference results in exception
• KT-58359 Allow volatile intrinsics on inline function constant arguments
• KT-60598 K2: add OptIn checkers for command line arguments
• KT-59766 K2: ISE: Cannot find cached type parameter by FIR symbol during the coroutines library build
• KT-59644 K2: the companion object in an expect class requires to be explicitly defined for compileNativeMainKotlinMetadata
• KT-59640 K2: expect constructor requires calling this or super but didn't use to
• KT-58883 K2: False negative type mismatch for generic annotation in collection literal
• KT-59581 K2: Initializer type mismatch: expected Array<KClass<*>>, actual Array<KClass> in annotation parameter default value using array literal
• KT-59069 K2 does not report EXPECTED_CLASS_CONSTRUCTOR_DELEGATION_CALL
• 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-60247 K2: order of data class generated member differs in IR
• KT-57223 K2: false-negative INAPPLICABLE_JVM_NAME on non-final properties outside interfaces
• KT-60183 K2: INAPPLICABLE_JVM_NAME on private methods with all-open plugin
• KT-60120 K2 can't get a default parameter value of expect annotation
• KT-57240 K2 MPP: Actualization doesn't work for flexible types
• KT-60436 K2: investigate possible FirJavaTypeRef equals parameter in FirDataFlowAnalyzer.hasEqualsOverride
• KT-60299 K2: when a typealias to Unit is returned, an explicit return is now required
• KT-58005 K2: Unsupported compile-time value BLOCK for Repeatable annotations
• KT-60223 K2: Wrong import with import alias
• KT-54854 K2. Unresolved reference for not imported declaration when it is already imported as an import alias is absent in K2
• KT-59738 K2: NoSuchElementException from JvmValueClassLoweringDispatcher in MPP environment
• KT-59708 K2: “Property must be initialized or be abstract” occurs due to constructors order
• KT-58483 K2. -Xmulti-platform flag isn't working
• KT-53490 FIR: Refactor augmented assignment resolving code - fix lhs-related problems and combine similar code in array and assign operator handling
• KT-59673 K2: incorrect error message
• KT-58578 K2: Commonize expect-actual logic between FIR and IR actualizer
• KT-54989 FIR2IR: fragile code in postfix op detection
• KT-59464 K2: Investigate cases of implicit type refs in Fir2IrImplicitCastInserter
• KT-53898 K2: False negative VAL_REASSIGNMENT on member vals
• KT-57641 K2: “java.lang.NoSuchFieldException: INSTANCE” in kotlin-reflect for KClass.objectInstance on an anonymous object
• KT-59299 [K2] ISE in IrBindablePublicSymbolBase.bind on equals function from companion of serializable class
• KT-58844 Incorrect type mismatch error: “actual type is kotlin/Int but kotlin/Int was expected”
• KT-59413 K2: Missing VALUE_CLASS_CANNOT_HAVE_CONTEXT_RECEIVERS
• KT-56173 FIR: IrGenerationExtensions cannot see default values from expect declarations
• KT-59611 FIR2IR: Unsupported callable reference for enum entry with clashing name
• KT-59858 Kotlin Native: Compilation failed: Sequence contains more than one matching element, org.jetbrains.kotlin.backend.konan.lower.FunctionReferenceLowering$FunctionReferenceBuilder.buildClass(FunctionReferenceLowering.kt:644)
• KT-58539 [K2] Ir actualization fails to match expect/actual declarations that use custom function types
• KT-59775 ‘toString()’ on Object returns different result with concatenation
• KT-59737 K2: Actual class ‘actual class FastArrayList : AbstractMutableList, MutableListEx, RandomAccess’ has no corresponding members for expected class members because of different parameter names in Java
• KT-59613 K2: Unhandled intrinsic in ExpressionCodegen exception in for expect function with default value in parameter
• KT-59216 K2. Unhelpful unresolved reference when inheriting from interface with constructor call (K1 reports NO_CONSTRUCTOR instead)
• KT-59057 Revise muted tests for native backend
• KT-57377 K2/MPP: internal declarations from common module are inivisible for intermediate modules during metadata compilation
• KT-59693 MPP: linkReleaseExecutableLinux fails with IllegalStateException: Drains have not been painted properly
• KT-59362 K2/MPP: .toByte() conversion for const val causes SourceCodeAnalysisException: java.lang.NullPointerException: null
• KT-51670 FIR: questionable behavior for deprecated String constructors
• KT-35314 StackOverflowError with nested try-finally and function with contracts
• KT-53460 False positive smartcast warning in if block after if block
• KT-40851 False MUST_BE_INITIALIZED_OR_BE_ABSTRACT error for a property which is initialised in the init block
• KT-59695 K2: false negative NON_PUBLIC_CALL_FROM_PUBLIC_INLINE
• KT-41198 False positive “Variable must be initialized” with assignment in scope function and safe call
• KT-58901 K2. Value parameter default values are not checked for type mismatch
• KT-48115 Member functions with type parameter and contract don't produce smartcasts
• KT-59541 K2: Type checking has run into a recursive problem on code that was compiling with Language 1.9
• KT-58943 K2: Incorrect with K1 priority of “invokeExtension + implicit receiver” candidate
• KT-37375 [FIR] Incorrect invoke resolution
• KT-59789 K2: self-reference does not compile anymore
• KT-59286 JVM IR inline: local property not found
• KT-58823 K2: Android app crashes right after start: java.lang.NoSuchMethodError: No virtual method findViewById(I)Landroid/view/View
• KT-57754 K2: No public signature built for the synthesized delegate field
• KT-58533 K2: “Not enough information to infer type variable T” for generic call in throw expression
• KT-34846 FIR Java: enhance type parameter bounds properly
• KT-52043 FIR: FirValueParameter with SubstitutionOverride does not reference the original FIR declaration
• KT-59291 JVM IR inline: unexpected result of apiVersionIsAtLeast invocation
• KT-59550 K2: synthetic property isn't seen through Java
• KT-59038 [K2] IllegalStateException in mixed Java/Kotlin inheritance
• KT-59489 K2: builld spring-petclinic-kotlin
• KT-58908 K2. Internal error “kotlin.UninitializedPropertyAccessException: lateinit property firType has not been initialized” on incomplete is
• KT-56755 K2: Investigate failures related to line numbers with LT compilation enabled
• KT-56139 K2: consider adding source element for implicit receivers
• KT-57489 K2: Incorrectly generated line numbers in companion object access inside class
• KT-58947 Run all existing codegen box tests with kapt stub generation
• KT-58827 K2 reports ACTUAL_WITHOUT_EXPECT on the whole class
• KT-54917 K2: ILT leak from a completed generic call
• KT-56187 K2: type parameter's upper bound is ignored in callable references
• KT-56186 K2: lack of type arguments in type constructor is ignored in callable references
• KT-59356 K2: Restrict rules for matching of expect supertypes for actual class
• KT-57217 K2: NoSuchMethodError on toChar call on java inheritor of java.lang.Number
• KT-58356 K2: StackOverflowError with OptIn and Deprecated, while compiling Kotlin project
• KT-57954 K2. Auto-generated “entries” member of enum class has higher priority than user-declared companion object with same name when language version is set to 2.0
• KT-59508 K2: Make sure that warnings-severity nullability annotations are not perceived as reasons for nullability errors
• KT-53820 FIR: mismatching error message for invisible reference/member
• KT-58641 K2: PublishedApi has no effect when internal fun used in the test source set
• KT-59461 K2: Erroneous null check when returning not-null typealias to nullable type
• KT-58980 K2: Import of java field from companion's base breaks the compiler
• KT-59140 K2: “Symbol public final static field is invisible” caused by java static field called in kotlin code
• KT-59501 Escape analysis constructs arrays of negative size
• KT-59452 apiVersionIsAtLeast calls in body of stdlib inline function may be evaluated on compile-time
• KT-53967 [PL] Classifiers: Turning interface from fun to non-fun + adding member function causes Kotlin/JS fail: IAE: “Sequence contains more than one matching element”
• KT-59346 Not working breakpoints on not initialized variables
• KT-55993 Wrong current pointer: strange behaviour of debugger or compiler when two IFs and an uninitialized variable between them
• KT-58335 K2: Exposed typealias from implementation dependency produces type mismatch in dependent module
• KT-58719 K2: false-positive INVISIBLE_REFERENCE error in case of importing an internal abstract class
• KT-57694 K2: False positive [NOTHING_TO_OVERRIDE] for a class overriding ‘sort’ method from the List collection
• KT-58460 K2. return without argument became allowed for functions with return type Any
• KT-49249 Incorrect nullability inferred for Throwable
• KT-57429 K2: Fix computing a mangled name for members of a generic class that reference the class's type parameters in their signature
• KT-57566 K2: Fix name mangling for functions that have dynamic type in their signature
• KT-57818 K2: Fix FirMangleComputer to not include the “special” package name into mangled names of property accessors on non-JVM platforms
• KT-57777 K2: Fix computing a mangled name for the synthesized entries property getter of an enum class
• KT-57433 K2: Fix computing a mangled name for top-level functions and properties
• KT-58553 k2: Annotation type arguments are lost in FIR2IR
• KT-58184 K2: False negative INVISIBLE_MEMBER on destructuring declaration
• KT-58637 K2: False negative ABSTRACT_MEMBER_NOT_IMPLEMENTED on Entry of Enum with abstract member declaration
• KT-54952 JvmSerializationBindings does not work with K2
• KT-54844 FIR/Analysis API: create stubs for equals/hashCode/toString for data classes in FIR
• KT-58555 K2: Generic property reference inside delegation misses type argument
• KT-57648 FIR: move deprecation calculation on COMPILER_REQUIRED_ANNOTATIONS phase
• KT-57049 K2 generates duplicates of symbols/declarations
• KT-55723 K2: deprecations for enum entries are not resolved on the TYPES phase
• KT-59033 Doesn’t support vararg parameter in annotation instantiation with empty arguments
• KT-58780 JVM IR inline: local property delegation is not working for K2
• KT-58779 JVM IR inline: correctly process special inlined block in value class lowering
• KT-58720 Generate full InnerClass attributes for the standard library
• KT-58215 K2: JVM IR produces line numbers for delegation bridges that are not marked with ACC_BRIDGE
• KT-42696 JVM IR generates line numbers for all bridges leading to extra steps in the debugger
• KT-57228 K2: annotations for interface member properties implemented by delegation are copied
• KT-57216 K2: non-trivial enum declaration does not have ACC_FINAL in the bytecode
• KT-55866 K2: Constant as parameter of @JvmName: BE: “Unsupported compile-time value CALL private final fun ”
• KT-58717 Object on the left-hand side of callable reference is not initialized if KCallable.name optimization is used
• KT-59211 Kapt+JVM_IR: AssertionError on delegating to anonymous object
• KT-57251 K2: weird error message when trying to instantiate an expect class without explicit constructor
• KT-58623 Language version 2.0: compiling into common, Native does not report “Protected function call from public-API inline function is prohibited”, while JVM, JS do
• KT-55945 NoSuchMethodError when calling method with value class parameter on java class inherited from kotlin class
• KT-58840 K1/K2: false positive EXPOSED_FUNCTION_RETURN_TYPE related to protected lower bound
• KT-57243 K2: no warning or error reported on expect class in CLI, and JVM backend tries to generate it to a .class file
• KT-57833 K2 reports NO_ACTUAL_FOR_EXPECT for inherited properties with the same name
• KT-58153 K2/MPP/JVM&Native: cannot override Any::toString when an expect-supertype has Any::toString override in actual-class
• KT-58124 K2: FIR2IR compiler crash with MPP (Fir2IrSimpleFunctionSymbol is already bound)
• KT-58346 k2: false negative MUST_BE_INITIALIZED for deferred initialization
• KT-57803 K2. “Kotlin: Only the Kotlin standard library is allowed to use the ‘kotlin’ package” error missing in 2.0
• KT-57504 [K2/N] Wrong coercion of ILT: 7 to kotlinx.cinterop.COpaquePointer causes Cannot adapt kotlin.Int to kotlinx.cinterop.CPointer during autoboxing
• KT-57484 K2: false positive OVERLOAD_RESOLUTION_AMBIGUITY with ImplicitIntegerCoercion
• KT-57971 K1/K2: False positive “Redundant ‘suspend’ modifier” warning on declaration site when suspend function is also argument
• KT-56779 Checkers false negative: AbstractMethodError when accessing setter via an interface where the member is defined as var, but it's val in implementation
• KT-51793 FIR: Investigate property+invoke resolution priorities
• KT-57003 FIR: missing annotation on parameter of data class' synthetic copy
• KT-57269 K2: collection stub for sort is not generated for custom List subclasses
• KT-54748 K2: incomprehensible errors when type parameter has the same name as a class
• KT-50703 FIR: Improve reporting UPPER_BOUND_VIOLATED for type arguments of typealias constructor calls
• KT-57622 Fix incorrect metadata for data class generated methods
• KT-54887 K2: fix behavior of references to value classes equals/hashCode/toString
• KT-58937 K2: Annotation vararg arguments are incorrectly serialized
• KT-58621 K2: Private class shadows public function defined in the same package
• KT-59041 K2. “IllegalStateException: Expected FirResolvedTypeRef with ConeKotlinType but was FirImplicitTypeRefImplWithoutSource ” on incorrect collection declaration
• KT-58665 K2: Optional.of incorrectly accepts nullable String
• KT-58938 K2. Abstract class can be invoked using member reference :: operator
• KT-50798 FIR: False negative UPPER_BOUND_VIOLATED_IN_TYPEALIAS_EXPANSION
• KT-58944 K2. StackOverflowError on incorrect intersection types
• KT-59241 K2: broken inference of DNN types
• KT-58294 K2 compiler crashes with OOM on deserializing annotation applied to itself with a enum outer/nested parameter
• KT-58972 K2: Error message of PRIVATE_CLASS_MEMBER_FROM_INLINE doesn't mention class members
• KT-58989 K2: Forbid suspend operator get/setValue and provideDelegate
• KT-59177 K2: Report NAMED_ARGUMENTS_NOT_ALLOWED for named parameters in lambdas
• KT-57028 K2: “NSEE: Sequence contains no element matching the predicate” with stream related Java api
• KT-58007 K2: Unsupported compile-time value GET_FIELD FIELD PROPERTY_BACKING_FIELD when const value is default for annotation
• KT-58472 Secondary constructor breaks MUST_BE_INITIALIZED check
• KT-59022 Make is and as behaviour consistent in Native
• KT-58902 K2: Calls to overridden method with default parameter are not compiled
• KT-58549 K2: variable type is infered to non-existing interface
• KT-58613 K2: ConcurrentModificationException from FirSignatureEnhancement.performFirstRoundOfBoundsResolution
• KT-55552 K2. False negative TYPE_MISMATCH in implementation via delegation
• KT-57436 Fix computing mangled names of generic properties from IR-based declaration descriptors
• KT-58543 [K2/N] Rewrite native MPP tests to avoid expect actual in same module
• KT-57701 Unify selection of inherited callable with default implementation among multiple candidates in JVM, Native & JS backends
• KT-58444 K2/MPP/metadata: compiler FIR2IR crash on constant with intrinsic initializer from common source set in Native-shared source set
• KT-57756 K2: Missing syntax errors when light tree parsing is used
• KT-57435 Fix computing mangled names for functions with context receivers
• KT-57219 K2: incorrect relative order of normal and use-site-targeted annotations on property getter in the resulting bytecode
• KT-57955 K2: “ClassCastException: class org.jetbrains.kotlin.ir.declarations.impl.IrExternalPackageFragmentImpl cannot be cast to class org.jetbrains.kotlin.ir.declarations.IrDeclaration” with property delegate
• KT-58583 K2: false-positive invisible reference error on nested anonymous object literal extending a protected nested class
• KT-57425 K2: False-positive smartcast on property accessed through a property from another module
• KT-57844 K2. Not relevant errors when accessing Java member which have private overloads with argument type mismatch
• KT-58584 K2: “UninitializedPropertyAccessException: lateinit property packageFqName has not been initialized”
• KT-58529 K2: “Extension function type is not allowed as supertypes” compile error
• KT-58379 K2: NEW_INFERENCE_ERROR in sortedBy call with exception in branch
• KT-58284 K2: False negative ITERATOR_MISSING
• KT-55078 K2 IDE: Infinite recursion in org.jetbrains.kotlin.fir.java.JavaScopeProvider#findJavaSuperClass
• KT-58080 K2: False-positive TYPECHECKER_HAS_RUN_INTO_RECURSIVE_PROBLEM on annotated const val
• KT-58674 K2: No expected type for while loop condition
• KT-56523 K2 should report MANY_INTERFACES_MEMBER_NOT_IMPLEMENTED
• KT-58238 Support dumping signatures and mangled names in irText tests
• KT-58456 K2: Custom function type metadata breaks Compose library compatibility
• KT-58267 K/N: do not reference hidden Array.content* functions from the compiler
• KT-57791 Native: Method returning String? leads to exception: Unexpected receiver type: kotlin.String
• KT-58437 K2: Do not use descriptors in KonanSymbols
• KT-57432 K2: Don't create default getters and setters in case when they are not needed
• KT-46047 FIR: incorrect type of integer literals
• KT-57487 [K2/N] Stdlib ArraysTest fails with Class found but error nodes are not allowed
• KT-56951 K2: False negative error on compound assignment for property of type Byte
• KT-57222 K2: compiler FIR serialization crash on two functions with captured type and object literal
• KT-58224 K2: deprecation on field is not detected properly
• KT-55662 K2. Incorrect type mismatch error “inferred type is IOT” instead of “inferred type is Int”
• KT-55668 K2. ‘in’ modifier became applicable to star projection
• KT-57064 K2: hidden internals of dealing with type-aliased primitive types are exposed to user
• KT-58252 K2: Symbol already bound for backing field during building resulting JS artifact for MPP project
• KT-56940 K/Wasm: report compiler errors for unsupported external declarations
• KT-56943 K/Wasm: implement @WasmImport diagnostics
• KT-55903 K2: False negative CANNOT_CHECK_FOR_ERASED on is-check for type with reified type arguments
• KT-56944 K/Wasm: implement @JsFun diagnostics
• KT-58329 K2: False-positive suspend conversion for anonymous functions
• KT-58028 K2: False-positive TYPE_PARAMETER_IS_NOT_AN_EXPRESSION

Docs & Examples

• KT-60545 Documentation change on Interoperability with Swift/Objective-C: highlight that it is not normal to suppress errors
• KT-50927 Kotlin / Docs: Delete all the information about old Kotlin/Wasm
• KT-61398 Advertise hierarchy templates in 1.9.20-Beta what's new

IDE

New Features

• KTIJ-23199 K2 IDE: Improve Import quick fix description
• KTIJ-26056 Support highlighting of KNM files

Performance Improvements

• KTIJ-26688 UAST: optimize methodNameCanBeOneOf

Fixes

• KTIJ-26782 Internal error while highlighting “AndroidHighlighterExtension does not define or inherit highlightDeclaration”
• KTIJ-27188 Bundled DevKit plugin + 1.9.20-Beta* constantly throws exceptions when opening another plugin codebase
• KTIJ-25220 Kotlin not configured dialog does not show if Kotlin stdlib is anywhere on classpath
• KTIJ-25563 Failed cinterop task becomes UP-TO-DATE and successfully passes on the second import
• KTIJ-26536 IDE in Java file resolves to property with the same name instead of method in the nested class from library
• KTIJ-25126 K2 IDE. No import quickfix for Java static members
• KT-60341 K2 IDE: “UnsupportedOperationException: Unknown type CapturedType(*)?”
• KTIJ-25960 K2 IDE: KDoc references to static java methods are not resolved
• KTIJ-7642 HMPP, IDE: False positive ‘‘suspend’ modifier is not allowed on a single abstract member’ for common code if JVM target present
• KTIJ-25745 K2 IDE: “Type info” intention shows the return type of a functional type instead of the functional type itself
• KTIJ-26501 K2: IDE K2: False positive unused import when declaration used for vararg parameter type
• KTIJ-26661 K2 IDE. PIEAE “Element class CompositeElement of type FUN” after removing/putting back function with operator modifier
• KTIJ-26672 K2 IDE: false positive in optimize import for ambiguity calls
• KTIJ-26760 K2 IDE: OVERLOAD_RESOLUTION_AMBIGUITY false positive
• KTIJ-26867 K2 IDE: rename refactoring doesn't rename subclasses if they are used in import directives
• KTIJ-26848 K2 IDE: index inconsistency in case of “” name
• KTIJ-26666 K2 IDE: changed FirFile is treated as fully resolved after in-block modification
• KT-59836 Symbol Light Classes: Type parameters from the parent interface aren't copied to DefaultImpls methods
• KT-28611 MPP: Gradle -> IDE: settings provided via compilations DSL are not imported into common modules facets
• KTIJ-25448 When project JDK is less than one defines in jvmToolchain block, run with Idea fails with has been compiled by a more recent version of the Java Runtime
• KT-60603 K2: Investigate intellij tests failures in branch 2.0
• KTIJ-25364 K2 IDE: References to Java records are red: OVERLOAD_RESOLUTION_AMBIGUITY, UNRESOLVED_REFERENCE
• KTIJ-24390 Kotlin assignment plugin: Imports are not recognized in build logic .kt files for Gradle build
• KT-60590 Fix light classes related tests in branch 2.0
• KT-60530 K2 scripting: exception on .gradle.kts opening
• KT-60539 K2: “KtInaccessibleLifetimeOwnerAccessException: org.jetbrains.kotlin.analysis.api.lifetime.KtReadActionConfinementLifetimeToken@3ce52fd9 is inaccessible: Using KtLifetimeOwner from previous analysis” at highlighting
• KTIJ-26276 K2 IDE: Optimize import drops used import alias
• KT-60518 K2 IDE. False positive [NON_MEMBER_FUNCTION_NO_BODY] when completing function with Complete current statement
• KT-60323 K2 IDE. “KotlinExceptionWithAttachments: Unexpected returnTypeRef. Expected is FirResolvedTypeRef, but was FirImplicitTypeRefImpl” exception on contract return type
• KT-60352 K2 IDE. Support Java Records
• KT-56503 K2 IDE: FIR tree is incorrect in a case of ProcessCancelledException was thrown during phase execution
• KTIJ-25653 K2 IDE. “KotlinExceptionWithAttachments: Containing function should be not null for KtParameter” exception on incorrect derived class declaration
• KT-59843 SLC: KotlinAsJavaSupport.packageExists (via KotlinStaticPackageProvider) said ROOT package doesn't exist if no KtFiles are given
• KTIJ-26206 Support retrieving KtType from annotation constructor calls on getters and setters
• KT-59445 Recursion detected on input: JavaAnnotationImpl
• KTIJ-26066 K2 IDE. “KotlinExceptionWithAttachments: Unexpected returnTypeRef. Expected is FirResolvedTypeRef, but was FirImplicitTypeRefImpl” on attempt to set contract
• KTIJ-26085 K2 IDE: treat psi modification of a contact inside a body as OOBM
• KTIJ-25869 K2 IDE. Expected FirResolvedTypeRef for return type of FirValueParameterImpl(Source) but FirImplicitTypeRefImplWithoutSource was found
• KTIJ-24272 K2 IDE: “Expected some types”
• KTIJ-24730 K2 IDE. IllegalStateException on absence of opening bracket in main() function
• KT-59533 AA/SLC: anonymous object appears during PsiType conversion, resulting in IllegalArgumentException:KtFirPsiTypeProviderKt.asPsiTypeElement
• KT-59563 Symbol Light Classes: Incorrect type erasure in $annotations methods for extension properties with generic parameters
• KT-57567 SLC: missing final modifier on enum (non-synthetic) members
• KT-59537 SLC: SymbolLightClassForAnonymousObject with null parent
• KTIJ-24121 K2 IDE. “failed to convert element KtLightField” when trying to declare property after function that has return with type mismatch
• KTIJ-25335 K2 IDE. “failed to convert element KtLightField:” on attempt to set property in class with constructor
• KT-59293 Symbol Light Classes: DefaultImpls methods must be static and have an additional $this parameter
• KTIJ-25976 K2 IDE: Fix “Unsupported compiled declaration of type” for type parameters
• KT-59325 Symbol Light Classes: Non-existing fields for properties from companion objects
• KT-57579 SLC: unboxed type argument as method return type
• KT-54804 Generate synthetic functions for annotations on properties in light classes
• KT-56200 Kotlin FIR reference resolve exception leaks user code
• KT-58448 K2 / IDE / SLC: findAttributeValue for attribute w/ default value raises ClassCastException

IDE. Completion

Fixes

• KTIJ-26518 K2 IDE: Code completion does not insert import when completing a type in the vararg position
• KTIJ-26713 K2 IDE: Code completion does not insert import when completing a type inside a functional type
• KTIJ-26597 K2 IDE: “Change return type” quick fix adds full qualified name to anonymous function
• KTIJ-26384 K2 IDE: Extension functions completion should recognize context receivers
• KTIJ-26419 K2 IDE: Completion in anonymous function inside when branch expression does not account for smart cast
• KTIJ-26629 K2 IDE: Completion of types in anonymous function return is not shortened
• KTIJ-26599 K2 IDE: Typing do ... while statement: InvalidFirElementTypeException: “For DO_WHILE with text... FirExpression expected, but FirDoWhileLoopImpl found”
• KTIJ-26113 K2 IDE: Completion in when branch does not account for smart casts if else branch is present
• KT-60451 K2 IDE: FirDeclaration was not found for class org.jetbrains.kotlin.psi.KtProperty, fir is class org.jetbrains.kotlin.fir.expressions.impl.FirBlockImpl
• KTIJ-21103 FIR IDE: implement completion In Kdoc
• KTIJ-24096 K2 IDE: Completion should insert the fully-qualified class name when the short class name clashes with a name from scope
• KTIJ-25116 K2 IDE: Name shortening in constructor's parameters affects constructor
• KTIJ-19863 Bad completion variants inside annotations

IDE. Decompiler, Indexing, Stubs

• KTIJ-26706 Bytecode viewer: “IllegalStateException: Couldn't find declaration file” for a file with a delegated property with inline accessor in another module
• KTIJ-25465 IDE hangs when indexing Kotlin project
• KTIJ-25979 K2 IDE: ‘java.lang.IllegalStateException: Attempt to load decompiled text, please use stubs instead’ exception if navigate to the decompiled KGP sources
• KTIJ-25985 Stub mismatch for names with special characters

IDE. Gradle Integration

• KTIJ-25334 Gradle 8.1: Unresolved references in IDE for build.gradle.kts
• KT-61777 Explicit API mode isn't reflected in IDE settings unless every task is configured with Gradle
• KTIJ-26306 apiLevel (API version) for Kotlin/Native modules is set to 1.8 with KGP 1.9 and IDE Plugin 1.9.0-XXX, if the compiler bundled to IDE Plugin is still 1.8
• KT-61172 MPP: Stacktraces of diagnostics are always printed during IDEA sync
• KT-48554 [Multiplatform Import] Ensure consistency between GradleImportProperties and PropertiesProvider
• KT-36677 MPP Gradle plugin doesn't respect manually set compiler arg -opt-in
• KT-58696 MPP + IDEA: tryK2 does not affect LV value of common facets
• KT-53875 Warn users about erroneously adding dependsOn from test to main
• KTIJ-23890 Gradle to IDEA import: “You are currently using the Kotlin/JS Legacy toolchain” balloon is shown when I actually use IR

IDE. Gradle. Script

• KTIJ-25523 Scripts: support for standalone configuration flag
• KTIJ-25910 Scripts: transition to GistStorage
• KTIJ-26778 Gradle 8.3: some parts of build.gradle.kts look unresolved
• KTIJ-26308 IAE “Unable to find script compilation configuration for the script KtFile: build.gradle.kts” on reopening project with build.gradle.kts
• KT-60171 K2 IDE: scripting freeze on kotlin project build.gradle.kts file
• KT-60236 K2 scripting: completion fails with exception
• KT-59801 K2 IDE: Adding of an import with a task name to a build script leads to unresolved references
• KT-60749 Scripting: default definition as a fallback
• KT-60199 K2 scripting: exception on script opening
• KT-60193 K2 scripts: configuration discovery fails silently from time to time

IDE. Hints. Parameter Info

• KTIJ-26824 K2 IDE: “Parameter Info” shows incorrect overload as selected

IDE. Inspections and Intentions

New Features

• KTIJ-26302 K2 IDE: Support adding a @OptIn annotation and suggesting to propagate opt-in requirement in quickFixes
• KTIJ-25002 Provide a quick fix to migrate use-site ‘get’ annotations on getters

Fixes

• KTIJ-24832 K2 IDE: ‘Redundant qualifier name’ false positive for nested classes from supertypes on the outside of a class
• KTIJ-26103 K2 IDE: False positive in redundant qualifier inspection
• KTIJ-26024 K2 IDE: False positive “Redundant qualifier” inspection on a nested class which extends its outer class
• KTIJ-26576 K2 IDE: “Redundant qualifier” false positive with referring parent's subclass in type constraint
• KTIJ-26785 K2 IDE: False positive “Redundant qualifier” inspection in extension function for Java interface with nested interface
• KTIJ-26695 K2 IDE. False negative “Redundant qualifier” directive for invoke function from object
• KTIJ-26627 K2 IDE: False positive “Redundant qualifier” inspection on extension property called on object when other ‘this’ is present in scope
• KTIJ-23407 K2 IDE. False positive unused import directive for invoke function from object
• KTIJ-26808 K2 IDE. “Redundant qualifier” inspection on the receiver of static method from Java may change semantic when receiver is not direct parent
• KTIJ-26840 K2 IDE. False positive “Redundant qualifier” inspection when accessing companion object member inside anonymous object and there is a name clash
• KTIJ-26498 KMP: Create expect-actual dialog selects incorrect path on Windows
• KTIJ-24877 K2 IDE. False negative unused import directive when declaration is available in file indirectly
• KTIJ-25368 K2 IDE. Specify type explicitly intention does not work with Java records

IDE. JS

• KTIJ-25023 K/JS: Remove balloon warning about migration to IR backend

IDE. Libraries

• KTIJ-13660 MPP library: No gutters for expect and actual symbols

IDE. Misc

• KT-60053 IdeaKotlinBinaryCoordinates doesn't respect capabilities and classifier attributes

IDE. Multiplatform

Fixes

• KTIJ-26700 KMP: false positive report of non matching expect and actual annotations if annotation is actual typealias
• KTIJ-25997 KotlinMPPGradleTestTasksProvider: Support jvm targets with other names (such as android)
• KT-61686 Check and update places in compiler and IDE where we are saying that MPP is experimental/Beta/Alpha
• KTIJ-27058 Wizard's KMM application failed to build in 232 AS
• KT-59760 [BUG] Use bundled version of Kotlin IDE Plugin in KMM Tests instead of custom
• KT-61520 Sources.jar is not imported for common and intermediate source-sets from the MPP library
• KTIJ-25842 MPP: New create expect/actual dialog uses deprecated location for android instrumented actual counterpart
• KTIJ-25746 MPP: Unable to distinguish android unit and instrumented tests in new create expect/actual dialog if instrumented tests are depends on common
• KT-60410 Add minimum supported KGP version in intellij.git infrastructure
• KT-59794 Bump used KGP in multiplatform intellij.git tests after release 1.9.0
• KT-59518 Cherry-pick old-import tests into 231-1.9.0/master
• KT-56736 Investigate how-to run multiplatform tests on real devices
• KT-59519 Bump AGP versions in intellij.git tests in master
• KTIJ-25591 MPP: Create expect/actual dialog doesn't allow selecting all targets
• KT-56684 Adopt KMM UI tests to be used with IDEA
• KT-50952 MPP: Commonized cinterops doesn't attach/detach to source set on configuration changes

IDE. Navigation

• KT-61894 Navigation from java sources leads to Kotlin decompiled code in case of suspend function
• KTIJ-27053 Value parameters documentation of expect isn't shown in actuals
• KTIJ-26292 Documentation for expect/actual comes from a random actual
• KTIJ-26441 K2 IDE: navigation doesn't work when type parameters are missed in annotation call
• KTIJ-26566 K2 IDE: don't show no-name parameters in presentations
• KTIJ-25366 K2 IDE. Go to declaration of Java record shows record and constructor

IDE. Refactorings. Rename

• KTIJ-25762 K2 IDE. label rename doesn‘t change it’s name in usages after rename refactoring

IDE. Script

• KTIJ-25989 java.lang.NullPointerException: Cannot invoke “com.intellij.openapi.vfs.VirtualFile.getPath()” because the return value of “java.lang.ThreadLocal.get()” is null
• KT-60519 Analysis API: scripts are not invalidated on PCE
• KTIJ-26670 K2 Scripts: We should be able to find a symbol for
• KTIJ-25731 KtAssignResolutionPresenceService is not available as a service in 231-1.9.20
• KT-60307 K2 IDE. KotlinExceptionWithAttachments in script file

IDE. Wizards

• KTIJ-27005 Wizards 232: Fix generated kotlin version for 1.9.20-Beta
• KTIJ-26846 Adjust compatibility data for 1.9.20 release
• KTIJ-26479 1.9.20: Update versions in wizards
• KT-59347 Rename Compose Multiplatform wizard to Compose for Desktop

IR. Interpreter

• KT-60467 “InternalError: Companion object * cannot be interpreted” caused by java's package name
• KT-60744 Restore binary compatibility of toIrConst function

IR. Tree

• KT-59771 Restore compatibility of IdSignature.CommonSignature
• KT-59772 Restore compatibility of IrFactory#createFunction
• KT-59308 Auto-generate the IrFactory interface

JS. Tools

• KT-44838 Kotlin/JS source-map-loader slow performance since 1.4.0

JavaScript

New Features

• KT-58684 KJS: ES15 classes — creating instance by class

Performance Improvements

• KT-58187 KJS / IR: Huge performance bottleneck while generating sourceMaps (getCannonicalFile)

Fixes

• KT-60425 Kotlin/JS compiler incorrect behavior for object singleton with CompleteableDeferred
• KT-62790 java.lang.ClassCastException in compiler when ::class is used
• KT-60495 K2: Make JS CliTestGenerated working with K2
• KT-6168 Ability to generate one JS file for each Kotlin source file
• KT-60667 K2 / KJS: jsTest fails with “SyntaxError: Unexpected token ‘}’” on runtime
• KT-61581 KJS: generate separate imports for useEsModules()
• KT-56737 K2: build Space JS
• KT-59001 K/JS: Use open-addressing hash map in JS stdlib
• KT-60131 KJS: Interference between @JsExport and final implementation of properties
• KT-59712 K/JS: Implement enumEntries intrinsic
• KT-60202 JsExport.Ignored internal extension still has “JavaScript name () generated for this declaration clashes with another declaration”
• KT-51333 KJS: some KType equals Nothing's KType throws an exception, breaking its symmetry
• KT-58857 KJS/IR: js file is not generated when source is stored in /var folder
• KT-53482 KJS: Inheritance from JS class fails in ES6, because constructor is not called with new
• KT-58891 K/JS: non-local return in lambda may leave an unreachable JS code after return
• KT-49077 KJS / IR: Wrong method called when using overloaded methods and class with the same name
• KT-59718 K/JS: Concatenating a String with a Char can lead to boxing of the Char
• KT-59717 K/JS: a redundant boxing of a returned Char from an inline function
• KT-39506 Kotlin/JS browser application using JS IR and React fails in runtime with “TypeError: _this__0._set_name__2 is not a function”
• KT-59151 K2 / KJS: NullPointerException in Fir2IrClassifierStorage.preCacheBuiltinClasses
• KT-59335 K/JS ES6 classes: A child constructor, when using parent secondary constructor super call, creates a parent object
• KT-58797 Optimize the code generated for objects on JS and Wasm backends
• KT-52339 FIx failing JS tests after bootstrap update
• KT-46643 KJS / IR: Setter of overridden var of external val is removed
• KT-55315 IR: can't access the stack property of Throwable
• KT-59204 Automatically generate NATIVE directive in tests for IR signatures
• KT-59239 K/JS: Bridge not generated for checking parameter type in generic class override
• KT-57347 KJS: BE IR Incremental cache invalidation doesn't work after inserting Partial Linkage stub
• KT-58599 KJS: Adding an override method to open class does not rebuild children JS code
• KT-58003 K2/MPP/JS: compiler IR serialization crash on multiple calls to inherited expect-function
• KT-38017 KJS: tests generate invalid code depending on file names
• KT-25796 KJS: Top-level constructs are put in an incorrect order
• KT-58396 KJS / IR: “IllegalStateException: Validation failed in file” with Enum.entries and inheritance

KMM Plugin

• KTIJ-27158 Import is failing after creation of new module if project don't use versionCatalog
• KT-59492 KMM AS plugin for Canary 231 reports error

Klibs

• KT-58877 [klib tool] add ability to dump klib ir
• KT-54402 Programmatic API to dump public signatures from KLibs
• KT-60576 Keep supported IR signature versions in manifest
• KT-59136 [PL] Lower the default PL engine messages log level down to INFO
• KT-59486 klib: Serialize mangled names along with signatures

Language Design

• KT-22841 Prohibit different member scopes for non-final expect and its actual
• KT-49175 Inconsistency with extension super-type allowance between suspend / non-suspend function types
• KT-61573 Emit the compilation warning on expect/actual classes. The warning must mention that expect/actual classes are in Beta
• KT-57614 KMP: consider prohibiting actual typealias when the corresponding expect class has default arguments
• KT-27750 Reverse reservation of ‘yield’ as keyword

Libraries

New Features

• KT-59440 Rework Flags API in kotlinx-metadata-jvm

Fixes

• KT-62381 K/Wasm: (re)publish libraries with 1.9.20-Beta2 (or newer if available)
• KT-62656 Drop @AllowDifferentMembersInActual from stdlib
• KT-58887 Reflection: “IllegalArgumentException: argument type mismatch” when using reflection to invoke a value class returning function that suspends
• KT-61507 Native: enum hashcode is not final
• KT-56106 Migrate stdlib to current Kotlin Multiplatform Plugin
• KT-58402 Migrate Vector128 from kotlin.native to kotlinx.cinterop
• KT-60911 Compatibility publishing of kotlin-stdlib-common
• KT-53154 Deprecate enumValues and replace it with enumEntries in standard library
• KT-58123 Update deprecations in native atomic classes for 1.9.20
• KT-60444 transformJvmMainAtomicfu fails with java.lang.NoSuchMethodError: ‘kotlin.Metadata kotlinx.metadata.jvm.KotlinClassMetadata.getAnnotationData()’
• KT-61342 kotlin-test-wasm-* artifacts include test code
• KT-61315 Publish common sources in kotlin-test-js sources jar
• KT-56608 WASI Preview1 version of Kotlin/Wasm stdlib
• KT-55765 Review and stabilize stdlib surface available in K/N
• KT-55297 kotlin-stdlib should declare constraints on kotlin-stdlib-jdk8 and kotlin-stdlib-jdk7
• KT-57838 Native: raise ExperimentalNativeApi opt-in requirement level to ERROR
• KT-61028 Behavioural changes to the Native stdlib API
• KT-61024 Native: Mark the kotlin.native.CName annotation with ExperimentalNativeApi
• KT-61025 Native: Deprecate HashSet.getElement() with WARNING
• KT-53791 Publish standard library as a multiplatform artifact with Gradle metadata
• KT-57363 Remove reified constraint from Array constructors in platforms where Array type parameter is not required to be reified
• KT-57401 Native: Regex matching zero length should split surrogate pairs
• KT-57359 Provide Common StringBuilder.append/insert with primitive type arguments
• KT-58264 K2: republish kotlinx.metadata to support LV 2.0
• KT-57710 Native: Internalize @Retain and @RetainForTarget annotations
• KT-57720 Native: Consider strictening NativeRuntimeApi opt-in requirement level to ERROR
• KT-57837 Deprecate kotlin.native.SharedImmutable and kotlin.native.concurrent.SharedImmutable
• KT-58126 Wasm: Consider removing Primitive.equals(Primitive) overload on primitive types
• KT-53327 Migrate all usages of ‘Enum.values’ to ‘Enum.entries’ in standard library
• KT-59366 Deprecate KmModule.annotations
• KT-59365 Get rid of two-stage parsing in KotlinClassMetadata
• KT-35116 Enum.valueOf throws inconsistent exception across multiple platforms
• KT-59223 Native Enum.hashCode should return identity hash code, similar to JVM
• KT-56637 Native: ‘String.indexOf’ matches byte sequences not on the char boundary, which also makes the result of ‘split’ and ‘replace’ operation incorrect
• KT-59192 Align behavior of collection constructors across platforms

Native

New Features

• KT-50463 Native: Provide a way to control the KONAN_DATA_DIR by the Gradle mechanisms
• KT-59448 K2: IR and FIR signatures are not same for composable functions

Fixes

• KT-60230 Native: “unknown options: -ios_simulator_version_min -sdk_version” with Xcode 15 beta 3
• KT-62532 Support Xcode 15.0 frameworks as Kotlin/Native platform libraries
• KT-61382 Linking XCFramework fails with error: Invalid record (Producer: ‘LLVM11.1.0’ Reader: ‘LLVM APPLE_1_1300.0.29.30_0’)
• KT-61417 Native: string and array variables are not properly displayed in lldb when compiling with caches with Xcode 15
• KT-60758 Native: Building for ‘iOS-simulator’, but linking in dylib built for ‘iOS’ in Xcode 15 beta 4
• KT-59149 Native: check compiler compatibility with Xcode 15 beta 1
• KT-58537 iOS project fails to build with rootProject.name = “Contains Space”
• KT-59073 Native: don't include kotlinx.cli endorsed library into compiler distribution
• KT-58707 [K/N] Compiler crash building generics with redundant cast
• KT-58654 Compiler error from kotlin.collections.Map : “Invalid phi record”, while compiling for kotlin native

Native. C Export

• KT-56182 [K2/N] C export doesn't work for non-root packages with K2

Native. C and ObjC Import

• KT-59642 Remove ability to import forward declaration by library package name
• KT-59643 K2: Disable merging of forward declaration with real declaration class
• KT-52882 MPP / Native: expect/actual mechanism broken when base contract is NSObjectProtocol
• KT-55578 Custom user message for linker error
• KT-58585 [K2/N] Fix interop issues
• KT-56041 [K2/N] Fix broken __builtin_nanf(String)
• KT-57716 [K2/N] Validation failed in file smoke.kt : unexpected type: expected platform.objc.Protocol?, got objcnames.classes.Protocol?
• KT-56028 [K2/N] cnames.structs.Foo does not resolve
• KT-59645 Cast to objective C forward declaration crashes compiler
• KT-58793 [K2/N] Package separators after mangling are different for IR and FIR

Native. ObjC Export

• KT-56090 [K2/N] Emit DocString klib extensions for ObjCExport

Native. Runtime. Memory

• KT-61914 Kotlin/Native: massive increase in memory usage
• KT-61092 Kotlin/Native: Adjust initial values for expected heap size
• KT-61091 Kotlin/Native: GC scheduler pauses mutators too aggressively
• KT-61741 Kotlin/Native: tsan error in parallel mark
• KT-57773 Kotlin/Native: track memory in big chunks in the GC scheduler
• KT-61089 Kotlin/Native: fix concurrent weak processing for new allocations
• KT-55364 Implement custom allocator for Kotlin/Native
• KT-57772 Kotlin/Native: concurrently process weak references in GC
• KT-57771 Kotlin/Native: parallel mark in GC

Native. Stdlib

• KT-60608 Introduce AtomicArrays API in K/N stdlib
• KT-59120 Native: Rewrite stdlib AtomicReference with Volatile instead of custom C++ code

Reflection

• KT-47973 Reflection: “IllegalArgumentException: argument type mismatch” when using callSuspend to call a function returning value class over primitive
• KT-41373 “KotlinReflectionInternalError: Unresolved class” when inspecting anonymous Java class
• KT-61304 Reflection: Calling data class copy method via reflection (callBy) fails when the data class has exactly 64 fields
• KT-52071 Continue gracefully when the system property check “kotlin.ignore.old.metadata” fails

Tools. CLI

• KT-60662 Add JVM target bytecode version 21
• KT-58183 ParseCommandLineArgumentsKt.parseCommandLineArguments takes ~500ms
• KT-58690 OutOfMemory when compiling in CLI
• KT-58065 K2: Enable light tree instead of PSI for CLI compilation of JS and Native by default

Tools. CLI. Native

• KT-59245 [K1/N] Compile sources to native binary in two stages
• KT-56855 [K2/N] Command-line compiler doesn't support compiling sources directly to a native binary (without intermediate klib) with -language-version 2.0
• KT-58979 [K2/N] FIR frontend cannot resolve symbols from resolved klib having non-normalized path

Tools. Commonizer

• KT-59302 Commonizer: make sure that opt-in annotation generated by cinterop made it into commonized artifact
• KT-62028 False positive “Unnecessary ‘@OptIn’ Annotation” for ExperimentalForeignApi
• KT-55757 kotlinx.cinterop.UnsafeNumber: empty opt-in message
• KT-59859 Change the OptIn Level to Error for kotlinx.cinterop.UnsafeNumber
• KT-59132 K2/Native/CInterop: [UPPER_BOUND_VIOLATED] Type argument is not within its bounds: should be subtype of ‘kotlinx/cinterop/CPointed’
• KT-58822 Kotlin Gradle Plugin: migrate tests off native deprecated targets
• KT-47641 Enabled cInterop commonization triggers native compilation during Gradle sync in IDE

Tools. Compiler Plugin API

• KT-58638 K2: Annotations generated by IR plugins are not included into metadata
• KT-61872 K2: Adding annotations to metadata from backend plugin doesn't work in the presence of comments on annotated declaration
• KT-61833 K2: annotations added via addMetadataVisibleAnnotationsToElement to declarations from common sourceset in MPP project are invisible
• KT-60051 K2: Support metadata serialization of primitive const annotation arguments generated by IR plugins

Tools. Compiler Plugins

• KT-61550 [atomicfu-compiler-plugin]: check that atomic properties are declared as private or internal val
• KT-58079 K2/atomicfu: JVM IR transformer crash on atomic extension functions
• KT-61293 Usage of atomicfu compiler plugin leads to UnsupportedClassVersionError if Gradle runs on JVM <11
• KT-55876 K2. “[Internal Error] java.lang.NoClassDefFoundError: org/jetbrains/kotlin/com/intellij/openapi/util/UserDataHolderBase” when project with languageVersion 2.0 is Built and Run using Intelij IDEA
• KT-58049 K2: Smartcast of nullable property fails when Spring compiler plugin is present
• KT-57468 Kotlin assignment plugin: operation name cannot be found for reference

Tools. Compiler plugins. Serialization

• KT-58501 K2/MPP/serialization: several classifier kinds seem to miss generated serializer functions when compiled to K/JS and K/Native targets
• KT-59768 kotlinx.serialization + K2 + JS/Native: Support meta-annotations on sealed interfaces with user-defined companions

Tools. Gradle

New Features

• KT-59000 Default standard library dependency should use the single artifact for all targets
• KT-57398 Add ability to run compilation via build-tools-api
• KT-34901 Gradle testFixtures don't have friendPaths set
• KT-44833 Gradle DSL: Add languageSettings accessor to kotlin extension that applies to all source sets
• KT-58315 Add build metrics for Kotlin/Native task

Performance Improvements

• KT-62318 Android Studio sync memory leak in 1.9.20-Beta
• KT-62496 Configuration time regression with KGP 1.9.20-Beta caused by loading of properties
• KT-61426 Enabling compilation via the build tools API may cause high metaspace usage

Fixes

• KT-61359 “Unresolved reference: platform” when enabling Gradle configuration cache
• KT-59826 Update SimpleKotlinGradleIT#testProjectIsolation to run on Gradle 8
• KT-57565 Add ability to capture classpath snapshots via the build-tools-api
• KT-51964 Optimize kotlin.incremental.useClasspathSnapshot feature to improve incremental Kotlin compilation
• KT-61368 Native compiler option ‘module-name’ isn't available within the compilerOptions extension for native target while configuring it inside compilations
• KT-61355 freeCompilerArgs arguments and its values are passed to the compiler 5 times if added through target-level compilerOptions{} extension inside compilations
• KT-61273 KGP: TaskOutputsBackup.createSnapshot was failed by IOException sometimes
• KT-58987 Use some available JVM target if there's no JvmTarget for the inferred toolchain version
• KT-58234 Kotlin Gradle Plugin: Deprecate and remove KotlinCompilation.source API
• KT-61401 The reported language version value for KotlinNativeLink tasks in build reports and build scans is inaccurate
• KT-54231 Compatibility with Gradle 8.0 release
• KT-61950 K/Wasm: Add warning about changed sourceSets
• KT-61895 KotlinTopLevelExtension.useCompilerVersion is not marked as experimental
• KT-61303 The module-name value stays unchanged when configuring it through compiler options extension specific to the android target
• KT-61194 MPP compiler options: part of JsCompilerOptions set up using js { compilerOptions {} } extension is lost
• KT-61253 CompileExecutableKotlinJs task is skipped while configuring LV either using sourceSets.all {} or both js compiler options extension and base multiplatform compiler options extension
• KT-59588 Upgrade max gradle version to max supported in kapt connected tests
• KT-61292 Gradle: compilation tasks may capture wrong build directory when build directory is changed after task configuration
• KT-61193 Flag kotlin.experimental.tryK2 doesn't set LV 2.0 for tasks of kotlin-js gradle plugin
• KT-60541 Possibility to create a custom usable KotlinCompile task without using internals
• KT-59451 [K2][1.9.0-Beta] “Errors were stored into ...” log files never actually exist
• KT-48898 Can't suppress warnings by Optin() in KMM build.gradle.kts or IDEA settings
• KT-60660 konan.data.dir property not provided for K/N Gradle project build (on Linux or Mac) with a dependency from a Maven
• KT-56959 K2: Set up Ktor repo performance benchmarks with K2 enabled
• KT-56178 Compatibility with Gradle 8.1 release
• KT-61457 Kotlin Gradle Plugin should not use internal deprecated StartParameterInternal.isConfigurationCache
• KT-60718 Kotlin Gradle Plugin's incremental compilation violates Project Isolation by accessing the tasks in the task graph that were produced by other projects
• KT-60717 Kotlin Gradle Plugin violates Project Isolation restrictions by dynamically looking up properties in the project
• KT-54232 Don't check if file exists in task file inputs configuration
• KT-61066 [KMP] iOS “Unkown Kotlin JVM target 20”
• KT-54160 New KGP API using lazy properties to add compiler plugin options may remove options with the same pluginId
• KT-60839 KGP provides incorrect default value “ENABLED” for -Xpartial-linkage
• KT-15370 Gradle DSL: add module-level kotlin options
• KT-57645 build_scan failed in testBuildScanReportSmokeTestForConfigurationCache test with Gradle 8.0.2
• KT-59827 Update configuration to validate plugin inputs
• KT-59799 Validate Gralde Integrations tests has only one tag
• KT-59117 Add gradle integration tests for explicit api mode in Android projects
• KT-59587 Upgrade max gradle version to max supported in jvmToolchain connected tests
• KT-56636 Bump max Gradle version for integration tests to 8.0
• KT-58353 Support reporting of diagnostics after projects are evaluated
• KT-53822 Upgrade the gradle-download-task dependency of the Kotlin Gradle plugin
• KT-58162 Kotlin Gradle Plugin: Remove kotlinx.coroutines from classpath of KGP
• KT-58104 Check values for MPP_PLATFORMS
• KT-58569 Bump language version for Gradle plugins dependencies to 1.5

Tools. Gradle. Cocoapods

• KT-59263 Add diagnostic that a dummy framework is not present when build is triggered from Xcode
• KT-57741 KMP importing an iOS project with Xcode 14.3 fails when importing a pod that depends on libarclite_iphoneos
• KT-60050 Log reason why podInstall task is skipped
• KT-49430 Stop invalidating iOS framework generated by KMM module on each Gradle Sync
• KT-59522 Set the required environment for cocoapods invocations
• KT-59313 Elevate to error deprecation of useLibraries
• KT-58775 If the pod has a declared dependency on itself, then it will cause StackOverFlow exception while importing of a project

Tools. Gradle. JS

New Features

• KT-49789 KJS / Gradle: Add npm style repository option for YarnRootExtension - and/or don't register github repository when download=false

Fixes

• KT-60469 KJS: “Could not serialize value of type Build_gradle” caused by changed name in packageJson task
• KT-61623 K/Wasm: Error with project dependency between modules with both wasmJs and wasmWasi targets
• KT-61326 K/JS: rootPackageJson fails with NLP when testPackageJson skipped and main packageJson up-to-date
• KT-60218 K/JS reports reports deprecation for non-Action dsl params in regular kotlin dsl
• KT-56933 Add Kotlin/JS incremental tests with K2 enabled
• KT-58970 browserTest gradle task fails if karma is used and gradle configuration cache is enabled
• KT-42520 Add a way to setup generating separate js files for each module inside gradle
• KT-32086 Gradle, JS: runTask.enabled = false has no effect on npm dependencies
• KT-48358 KJS: Circular dependency when multiple second-level Gradle modules have the same name
• KT-50530 Kotlin/JS: enabling kotlin.js.ir.output.granularity=whole-program does not remove superfluous .js output files
• KT-50442 KJS / Gradle: webpack plugin errors not logged
• KT-46003 KJS / IR: Should provide single distributions folder for production and development similarly to Legacy
• KT-47319 KJS: Error when project contains two modules with same name
• KT-46010 KJS / Gradle: Can't find a file on building on Windows
• KT-48923 KJS / Gradle: No Webpack error messages when Node.js process exits unexpected
• KT-51942 KJS / Gradle: fails with two projects with the same name, but different paths
• KT-51372 Kotlin/JS: Gradle compileKotlinJs processes directory just excluded from source set
• KT-52134 KJS: the default generated JS module name in a Gradle project with multiple subprojects is incomplete, which might cause duplicate names and build conflicts
• KT-52776 KJS / Gradle: Webpack version update despite yarn.lock breaks Kotlin/JS build
• KT-39173 Kotlin/JS: kotlinNpmInstall fails with Gradle plugin 1.4-M2 and transitive dependency to 1.4-M1
• KT-55216 KJS / IR: Transitive NPM dependencies between projects are not included in jsPublicPackageJsonTask
• KT-54182 MPP / JS: StackOverflowError when in a Gradle multi-project and Kotlin Multiplatform build with the JS IR target which depends on another with the same subproject name via a renamed published Maven artifact
• KT-58250 The NodeJsExec tasks are not compatible with Gradle configuration cache
• KT-58256 The D8Exec tasks are not compatible with Gradle configuration cache

Tools. Gradle. Multiplatform

New Features

• KT-60441 KGP based dependency resolution: Support ‘idea.gradle.download.sources’ flag

Fixes

• KT-59316 Deprecate multiple ‘same’ targets
• KT-59042 “Cannot build ‘KotlinProjectStructureMetadata’ during project configuration phase” when configuration cache enabled
• KT-58029 Emit warning when using experimental artifacts DSL
• KT-60763 Evaluate user feedback after switch to java-base plugin for KotlinJvmTarget.withJava
• 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-59321 Deprecate targets.presets
• KT-58759 Deprecate platform, enforcedPlatform and other related to Gradle DependencyHandler methods in KotlinDependencyHandler
• KT-60579 Multiplatform;Composite Builds: prepareKotlinIdeaImport called by wrong path for nested build, causing sync fail
• KT-61540 K2: KMP/K2: Metadata compilations: Discriminate expect over actual by sorting compile path using refines edges
• KTIJ-26340 Bump Kotlin Gradle Plugin version to ‘1.9.20-dev-6845’
• KT-59020 1.9.0 Beta Kotlin plugin Gradle sync fails with intermediate JVM + Android source set
• KT-60198 Stop publishing the org.jetbrains.kotlin.multiplatform.pm20
• KT-60596 Return targetHierarchy with deprecation to kotlin dsl for smooth migration
• KT-59595 KotlinJvmTarget.withJava: Switch implementation from java to java-base plugin
• KT-58800 Add some cocoapods will cause Xcode preview into build loop since Xcode 14.3
• KT-58489 MPP: Add an error if SourceLayoutV1 is used
• KT-59774 MPP: Print stacktraces of diagnostics only when --stacktrace (or higher) is used
• KT-60158 KotlinJvmTarget.withJava: Ensure java source sets are created eagerly
• KT-58316 Gradle 8: ‘:podDebugFrameworkIosFat’ and [configuration ‘:debugFrameworkIosFat’] contain identical attribute sets
• KT-59615 renderReportedDiagnostics: Rename ‘isVerbose’ to ‘renderForTests’
• KT-60943 K2/KMP: compileCommonMainKotlinMetadata fails with resolution ambiguity between candidates from stdlib
• KT-60491 KMP: Add documentation link to the warning message w: The Default Kotlin Hierarchy was not applied to
• KT-57521 MPP: Compiler options declared in places other than languageSettings don't reach shared source sets
• KT-58676 Enable default Kotlin Target Hierarchy by default
• KT-61056 Native-shared source sets don't receive dependency on a commonMain of 1.9.20 stdlib
• KT-58712 Enable commonization by default if the CocoaPods plugin provided the dependencies that should be commonized
• KT-59317 Deprecate ios() preset in favor of target hierarchy
• KT-47144 [Multiplatform] Warn about setting *Test.dependsOn(*Main)
• KT-59733 Make KotlinDefaultHierarchyFallbackIllegalTargetNames to check target names disregarding the case
• KT-55787 Deprecate dependsOn edges ending at declared source sets of platform compilations
• KT-58872 MPP: kotlin-test library reported as published in the legacy mode
• KT-59863 pluginManagement.includeBuild doesn't work when kotlin(“multiplatform”) applied to one of subprojects of included build
• KT-58729 Investigate failures in KMM UI tests
• KT-59661 Bump kotlin.git AGP version in tests to 8
• KT-58753 Add Hedgehog AS in KMM UI tests
• KT-58731 Fix failues in Mac tests in kt-master, kt-231-1.9.0 and kt-223-1.9.0
• KT-59248 Fix failures in Mac tests and Android Tests in kt-223-master and kt-231-master
• KT-58732 Run kt-master Mac tests on cloud Mac
• KT-57686 Fix KMM UI tests again
• KT-60134 MPP: Include user attributes to host-specific metadata dependency configurations
• KT-60233 Investigate publication of TargetJvmEnivornment on Kotlin configuration
• KT-59311 Elevate to Error commonMain.dependsOn(anything)
• KT-59320 Elevate to Error usage of jvmWithJava
• KT-45877 MPP / Gradle: “GradleException: Please initialize at least one Kotlin target” isn't user-friendly
• KT-59844 KGP-based import: Reduce ‘red wall of errors’ on dependency resolution failures
• KT-60462 jvm().withJava(): Zombie instance returned for compilations created after withJava call
• KT-58471 Kotlin Multiplatform plugin resolves configurations during configuration
• KT-59578 External Android Target: Implement integration tests
• KT-58737 Develop tests for old import in new intellij.git test infra
• KT-59268 Run multiplatform tests in intellij.git with XCode 15.0 manually
• KT-58220 Kotlin Gradle Plugin: Kotlin 1.9 release grooming
• KT-58305 Investigate KotlinAndroidMppIT.testCustomAttributesInAndroidTargets: being broken for AGP 7.0.4
• KT-58255 Kotlin Gradle Plugin Lifecycle: Remove LifecycleAwareProperty
• KT-55312 Replace “ALL_COMPILE_DEPENDENCIES_METADATA” configuration with set of metadata dependencies configurations associated per set
• KT-54825 TCS: Gradle Sync: Dependency resolution in KGP

Tools. Gradle. Native

• KT-54362 Support Gradle Configuration caching in Xcode integration tasks and in CocoaPods plugin
• KT-61700 Native: linkDebugExecutableNative has duplicated freeCompilerArgs
• KT-58519 Migrate Xcode/CocoaPods warnings to the new diagnostics infra
• KT-61154 NativeCompilerDownloader adds .konan/kotlin-native-prebuilt-linux-x86_64-1.9.0/konan/lib/kotlin-native-compiler-embeddable.jar as configuration cache input
• KT-59252 Support configuration cache in Xcode/CocoaPods tasks with Gradle 8.1

Tools. Incremental Compile

• KT-61852 Kotlin 1.9.20-Beta: incremental compilation fails with files outside of the project folder
• KT-19745 After konverting java to kotlin, kapt3 throws duplicate class exception
• KT-58547 “has several compatible actual declarations in , ”

Tools. JPS

• KT-58026 Add basic JPS build performance metrics
• KT-57039 K2 IDE. Cannot compile gradle project with LV=2.0 via JPS with NoClassDefFoundError: org/jetbrains/kotlin/com/intellij/openapi/util/UserDataHolderBase
• KT-58314 kotlin-build-statistics is missing for kotlin-jps-plugin

Tools. Kapt

Fixes

• KT-62438 Change experimental K2 kapt diagnostic message
• KT-61879 K2 Kapt: java.lang.NoSuchMethodError during stub generation
• KT-58326 KAPT / Gradle: argument changes are ignored
• KT-61114 K2 Kapt: add a Gradle property kapt.use.k2 to enable K2 Kapt
• KT-57594 K2: Investigate the Kapt features used in the quality gates projects
• KT-59754 K2: KAPT4 generates non-compilable code for nested data classes, annotated by Moshi's @JsonClass
• KT-60270 K2: KAPT4 tries to generate metadata for local variables
• KT-60293 K2: KAPT4 fails to generate metadata for const vals
• KT-59704 KAPT4 does not support Dagger's @Inject lateinit properties
• KT-59745 K2: KAPT4: ISE when passing moshi's @JsonClass to Class
• KT-59756 K2: KAPT4 with Moshi generates @Transient fields
• KT-59757 K2: KAPT4: Generic interfaces with default methods lead to static usage of type parameters
• KT-59703 KAPT4 generates old metadata version

Tools. Maven

• KT-26156 Maven Kotlin Plugin should not WARN when no sources found

Tools. Parcelize

• KT-57795 Add for-ide support for Parcelize K2 jars

Tools. Scripts

• KT-57877 K2 / Script: “IllegalArgumentException: source must not be null” during compilation
• KT-58817 K2: support for .kts highlighting and completion

Tools. Wasm

• KT-62128 Wasm tests (still) do not work on Kotlin 1.9.20-Beta2
• KT-61973 K/Wasm: wasmWasiNodeRun is missed
• KT-61971 K/Wasm: wasmWasiTest should depends on kotlinNodeJsSetup
• KT-60654 Wasm: split wasm target into wasm-js and wasm-wasi
• KT-57058 Do not require a return value for DOM event listeners with Kotlin/Wasm
• KT-59062 WASM: Report errors when calling WebAssembly.instantiateStreaming in tests
• KTIJ-25207 Collect stats about Kotlin/Wasm usage

1.9.0

Analysis API

New Features

• KT-57930 Analysis API: provide an API for extending Kotlin resolution
• KT-57636 K2: Add the return type of K2 reference shortener AA ShortenCommand::invokeShortening() e.g., ShorteningResultInfo to allow callers to access the shortening result PSI

Fixes

• KT-58249 Analysis API: Disable error logging for FE10 implementation of resolveCall when resolve is not successful
• KT-55626 Impossible to restore symbol by psi from script file
• KT-57314 LL FIR: Combine LLFirProvider$SymbolProviders in session dependencies (optimization)
• KT-55527 K2 IDE: Rewrite KtScopeContext class to allow to handle each scope separately
• KT-55329 LL FIR: Unexpected ACTUAL_WITHOUT_EXPECT error on constructor and function declaration
• KT-50732 LL API: fix compiler based tests
• KT-57850 K2: contract violation due to SymbolLightAccessorMethod.propertyAccessorSymbol
• KT-56543 LL FIR: rework lazy transformers so transformers modify only declarations they suppose to
• KT-56721 K2: FirExtensionDeclarationsSymbolProvider: java.lang.IllegalStateException: Recursive update
• KT-50253 Analysis API: Solve issues with ProcessCancelledException
• KT-56800 K2 IDE: optimize deprecation calculation for symbols
• KT-55006 Analysis API does not transform Java type refs for callable symbol return types
• KT-57256 AA FIR: Reduce lazy resolve phase for deprecation status
• KT-57619 K2: CFG for class initializer is not correctly built in reversed resolve mode
• KT-58141 K2: AA FIR: impossible to restore symbol for declaration with annotation with argument inside type
• KT-57462 Symbol Light Classes: SymbolLightFieldForProperty should retrieve annotations not from KtPropertySymbol, but from the corresponding backing field
• KT-54864 Analysis API: add function to get expect KtSymbol list by actual KtSymbol
• KT-56763 Analysis API: .KtSourceModuleImpl is missing in the map. on symbol restore when symbol cannot be seen from the use-site module
• KT-56617 Analysis API: optimize KtFirSymbolProviderByJavaPsi.getNamedClassSymbol
• KT-54430 K2: .getAllOverriddenSymbols() returns invalid results

Backend. Native. Debug

• KT-55440 Kotlin/Native debugger: inline function parameters are not visible during debugging

Backend. Wasm

• KT-58293 Wasm: ReferenceError: e is not defined in kotlin.test.jsThrow
• KT-58931 Wasm tests are failing to start on Kotlin 1.9.0-Beta
• KT-58188 Restore binary compatibility of PlatformDiagnosticSuppressor.shouldReportUnusedParameter
• KT-57136 K/Wasm: Restrict non-external types in JS interop
• KT-57060 Clarify the lack of support for dynamic in Kotlin/Wasm
• KT-56955 K/Wasm: Support restricted version of K/JS js(code)
• KT-57276 Wasm: “Body not found for function” error when compiling konform library with Kotlin/Wasm support
• KT-56976 K/Wasm bug with calling override of external function with default parameters

Compiler

New Features

• KT-55333 Allow secondary constructors in value classes with bodies
• KT-54944 @Volatile support in native
• KT-54746 Deprecate with ERROR JvmDefault annotation and old -Xjvm-default modes
• KT-47902 Do not propagate method deprecation through overrides
• KT-29378 K2: rework warnings/errors for equality/identity operators on incompatible types
• KT-57477 False-positive overload resolution ambiguity in case of lambda without arguments
• KT-57010 Kotlin/Native: make it possible to compile bitcode in a separate compiler invocation
• KT-55691 K2: Avoid inferring Nothing? in presence of other constraints (beside type parameter bounds)
• KT-46288 Unexpected behavior of extension function on lambda with suspend receiver
• KT-24779 Inconsistent smart cast behavior for bound data flow values

Performance Improvements

• KT-23397 Optimize out field for property delegate when it's safe (JVM)
• KT-56906 FIR: Use cached instance of FirImplicitTypeRefImpl in FIR builders
• KT-56276 LanguageVersion.getVersionString() allocates 5k objects on project opening

Fixes

• KT-57784 “NullPointerException: Parameter specified as non-null is null:” with enum, companion object, ‘entries’ and map
• KT-55217 K2: support callable reference conversions on top-level expressions
• KT-57232 K2: build Space JVM (master)
• KT-59079 “AE: SyntheticAccessorLowering should not attempt to modify other files!” with callable reference to constructor with value class parameter
• KT-58837 Partial linkage fails to report any compiler message on Windows when launched through Gradle plugin
• KT-57602 K2: Rework member scope of types having projection arguments for covariant parameters
• KT-55171 Put new contracts syntax under a feature flag
• KT-58719 K2: false-positive INVISIBLE_REFERENCE error in case of importing an internal abstract class
• KT-56030 [K2/N] Support Objective-C overloading by param names only
• KT-57510 K2: Data class equals/hashCode/toString methods are not written to Klib metadata
• KT-56331 K2: compiler backend crash on usage of expected function with default arguments
• KT-53846 K2 / Context receivers: ClassCastException on secondary constructor of class with context receiver
• KT-58621 K2: Private class shadows public function defined in the same package
• KT-59102 K2: constant evaluator does not provide Long type on shl
• KT-59066 [K2] delegation leads to “IllegalStateException: Expected some types”
• KT-56074 K2: build Space JVM (snapshot 2022.3)
• KT-58787 KAPT: “NullPointerException: null cannot be cast to non-null type” with delegate
• KT-57022 K2 IllegalStateException in signature computation
• KT-56792 K2: build kotlinpoet
• KT-57373 K2: FIR properties synthesized when implementing interface by delegation don't have accessors
• KT-56583 K1: Implement opt-in for integer cinterop conversions
• KT-59030 [PL] Workaround for broken @Deprecated annotations in c-interop KLIBs
• KT-58618 K2: Local property delegates cannot infer generic return type
• KT-36770 Prohibit unsafe calls with expected @NotNull T and given Kotlin generic parameter with nullable bound
• KT-56739 K2: build Space iOS
• KT-57131 K2: stdlib test compilation fails on ListTest.kt in FirJvmMangleComputer
• KT-58137 K2: ISE “Usage of default value argument for this annotation is not yet possible” when instantiating Kotlin annotation with default parameter from another module
• KT-58897 K2: False positive unresolved reference with same-named enum class and its entry
• KT-40903 Forbid actual member in expect class
• KT-30905 Expect var property with default public setter matches with actual var property with private setter
• KT-56172 K2: Fix reporting of PRIVATE_CLASS_MEMBER_FROM_INLINE error
• KT-56171 Implement deprecation warning for missing PRIVATE_CLASS_MEMBER_FROM_INLINE error
• KT-27261 Contracts for infix functions don't work (for receivers and parameters)
• KT-56927 Enum with secondary constructor can't be compiled with K2 using JS/Native backend
• KT-53568 Partial linkage: absent class as type parameter bound causes failure of compileProductionExecutableKotlinJs
• KT-53608 Partial linkage: Kotlin/JS fails with IllegalStateException: “Validation failed in file” when overridden declaration was visible, but now private
• KT-53663 Partial linkage: usage of property which becomes abstract: no IrLinkageError, but AssertionError in Native backend instead
• KT-56013 K2. a set of errors about local properties are missing
• KT-53939 Partial linkage: with turning object into class linkNative and jsTest tasks fail
• KT-53938 Partial linkage: with turning interface into class and using as second parent Native build fails
• KT-53941 Partial linkage: with turning class into object accessing member via parameterless constructor does not fail
• KT-53970 Partial linkage: on turning nested class into inner JS tasks are successful, Native build fails
• KT-53971 Partial linkage: turning inner class into nested: without usage in executable Native is successful, JavaScript fails
• KT-53972 Partial linkage: turning inner class into nested: with usage in executable Native fails with NPE in backend
• KT-54045 Partial linkage: turning class into type alias + calculating implicit function type: build fails with UninitializedPropertyAccessException: “lateinit property parent has not been initialized”
• KT-54046 Partial linkage: turning type alias into class + using it as type: build fails with AssertionError: “Expected exactly one delegating constructor call but none encountered”
• KT-53887 Partial linkage: turning from enum to regular class + reference to enum contant causes compileProductionExecutableKotlinJs fail with IllegalStateException
• KT-54047 Partial linkage: reference to removed enum const causes JS fail with “IllegalStateException: Validation failed in file”
• KT-54048 Partial linkage: reference to removed enum const in runtime causes Native fail with IllegalStateException at IrBindablePublicSymbolBase.getOwner()
• KT-53995 Partial linkage: on turning class to abstract and direct constructor call Naive fails, JavaScript is successful
• KT-43527 @ExtensionFunctionType is allowed on function types with no parameters and leads to backend exception
• KT-55316 K2. IllegalStateException on incorrect import directive name
• KT-57570 Remove source code excerpts from platform type nullability assertion exceptions
• KT-56073 K2: build Exposed
• KT-47932 Report errors on cycles in annotation parameter types
• KT-38871 Kotlin Gradle DSL, MPP: UNUSED_VARIABLE when configuring a sourceset with delegated property
• KT-46344 No error for a super class constructor call on a function interface in supertypes list
• KT-56609 K2: False positive NULL_FOR_NONNULL_TYPE with -Xjsr305=strict and @Nullable annotation Java parameter
• KT-56656 K1/K2: inconsistent NOTHING_TO_OVERRIDE with complex nullable annotations
• KT-58332 K2: local fun with suspend type is not marked as suspend in IR
• KT-57991 K2: Modifier ‘suspend’ is not applicable to ‘anonymous function’
• KT-54294 K2: “Not all type variables found” in builder inference with type parameters inferred through a union of two branches
• KT-58564 [PL] Annotations with unlinked parameters are not removed
• KT-52597 Provide Alpha Support for Multiplatform in the K2 platform
• KT-58523 K2: reference is resolved to imported type-alias instead of identically named top-level property
• KT-57098 Native: avoid object initialization while accessing const val
• KT-57973 32-th default value in inline classes override function is not used
• KT-57714 “IllegalStateException: <B::!>” using reified generics
• KT-57810 toString of object erroneously considered as constant function in string concatenation
• KT-58076 K2: Incorrect inference of type of labeled receiver
• KT-57929 K2: Arguments of annotations are not calculated in a lot of strange locations
• KT-54874 K2. No compilation error with incorrect Comparator invocation
• KT-55388 Consider enabling ProhibitUsingNullableTypeParameterAgainstNotNullAnnotated
• KT-53041 NPE in Kotlin 1.7.0 when using RxJava Maybe.doOnEvent with anonymous parameters
• KT-54829 Cleanup local types approximation logic
• KT-58577 K2: private Kotlin property prevents use of Java set-method from Java-Kotlin-Java hierarchy in another module
• KT-58587 MUST_BE_INITIALIZED must take into account effectivelly final
• KT-58524 K2: false-positive overload resolution ambiguity error on invoking a generic class's member function with id-shaped function-typed parameter on intersection-typed receiver
• KT-53929 Enum.entries: consider changing scope behavior in K1
• KT-58520 K2: FIR2IR: ISE during const evaluation of operator times with exposed
• KT-57905 K1: resolution to base class‘s Java field instead of derived class’s Kotlin property is not deprecated in case of different types
• KT-56662 K1: false negative INVISIBLE_SETTER for a var with internal setter accessed from a derived class
• KT-57770 K2: Support generation of serializer if base class for serializable class declared in different module
• KT-58375 Kapt: “wrong number of type arguments. required 1” when more than 22 type arguments
• KT-48870 [FIR] Different behavior for explicit receiver resolution inside delegated constructors
• KT-58013 K2: “Not enough information to infer type variable T” when using assert non-null (!!) and delegation
• KT-58365 K2: Fix stub types leakage in builder inference caused by implicit receiver type update with partially resolved calls (IGNORE_LEAKED_INTERNAL_TYPES for stub types)
• KT-58214 Continuation parameter only exists in lowered suspend functions, but function origin is LOCAL_FUNCTION_FOR_LAMBDA
• KT-58030 K2/MPP/JVM: compiler backend crash on super-call to indirectly inherited Java method
• KT-58135 K2: Priority of extension property is lower than ordinary property
• KT-57181 [K1/N, K2/N] Expect and Actual funs have different IdSignature.CommonSignature, if Expect has default argument
• KT-58219 K2/MPP/metadata: false-positive invisible reference error in Native-shared source set
• KT-58145 K2/MPP/metadata: compiler FIR crash on inheritance of a generic class with property by actual-class from Native-shared source set
• KT-56023 Constant operations (e.g. division) are not constant in K2 (JS, Native)
• KT-57354 In suspend function default arguments are sometimes not deleted in IR
• KT-55242 K2/MPP: basic build/link functionality
• KT-57979 K2: Unresolved reference error when assigning to Java synthetic property with a different nullability getter
• KT-57543 K2 reports DELEGATE_SPECIAL_FUNCTION_NONE_APPLICABLE
• KT-58142 K2: val parameter with more specific type is lower priority
• KT-48546 Missed TYPECHECKER_HAS_RUN_INTO_RECURSIVE_PROBLEM error at plus-assign
• KT-57854 RECEIVER_TYPE_MISMATCH on synthetic property from mutually recursive Java generics with disabled ProperTypeInferenceConstraintsProcessing
• KT-54518 False negative NON_PUBLIC_CALL_FROM_PUBLIC_INLINE when calling internal method of super class
• KT-58025 K2: Argument type mismatch when using Springs HandlerMethodArgumentResolver
• KT-58259 Unexpected unresolved function call with obvious invoke-convention desugaring
• KT-57135 K2: Fir should take into account an annotation's allowed targets as well as the use-site target when deciding whether it applies to a property, a field, or a constructor parameter
• KT-57069 K2: Method kind in metadata is DECLARATION when DELEGATION is used in K1
• KT-57958 K2: Initializer type mismatch when using extension property on type with star projection
• KT-58149 K2: New inference error with buildList
• KT-58008 K2: “Cannot find cached type parameter by FIR symbol: T” on suspend function with generic and nested class
• KT-57835 K2: compiler crash on lambda with dynamic receiver
• KT-57601 K2: Builtin function extensionToString can't be accessed
• KT-57655 K2: ImplicitIntegerCoercion is not working for named arguments
• KT-58143 K2: overload resolution ambiguity inside dynamic lambda
• KT-58132 K2: Implicit int constant to long converion crashes FirSerializer
• KT-57378 Partial linkage: Run codegen box tests for Native & JS with enabled PL
• KT-58207 K2: Handle result of completion of synthetic call with callable reference argument
• KT-56549 K2: Reference to Java sealed class fails to compile
• KT-57994 K2: Type inference failed on function reference
• KT-58099 interop0 test fails with error “type kotlin.String? is not supported here: doesn't correspond to any C type”
• KT-57671 Synthetic $EntriesMappings declaration is public and generated even for enums from current module on IC
• KT-56517 K2: Reference to Java record fails to compile: “unresolved reference”, “Overload resolution ambiguity between candidates”
• KT-58163 FIR: deserialized default property setter and getter must have FirResolvePhase.ANALYZED_DEPENDENCIES phase
• KT-55646 K2: Report definitely non-nullable as reified error
• KT-58043 k2: Expect call is not removed from IR with nullability-based overload
• KT-56442 K2: Make sure K2 has the same behavior for defaults with overrides as K1 has
• KT-55904 Fix tests for volatile annotation on K2
• KT-57928 K2: Arguments of annotations on constructor value parameter are not calculated
• KT-57814 K2: Argument type mismatch with delegating property
• KT-56490 Implement deprecation for an anonymous type exposed from inline functions with type argument
• KT-57781 K2: Generated serializer is invisible in a non-JVM test source set
• KT-57807 K2: Symbol already bound exception for arrayOf function from IrBuiltInsOverFir
• KT-57962 K2: No set method providing array access on dynamic
• KT-57353 K2: unresolved reference when using fully qualified object declaration name as an expression, when a declaration package is from another klib and has at least two name segments
• KT-57899 K2: compiler FIR2IR crash on anonymous object with inheritance by delegation to value of smart-casted type parameter
• KT-57988 K2: compiler exception on get operator on dynamic this
• KT-57960 K2: incorrect type inference in lambda with dynamic receiver
• KT-57923 K2: Optional expectation annotation crashes const evaluator
• KT-56511 K1: false negative SMARTCAST_IMPOSSIBLE when alien constructor property is accessed from a private class
• KT-58033 K2 reports Constructor must be private or protected in sealed class in actual sealed class if its constructor has own actual declaration
• KT-58061 K2: false-positive unsupported feature error on callable references to Java methods from annotation interfaces
• KT-55079 Refactor DiagnosticReporterByTrackingStrategy and fix some “diagnostic into black hole” problems
• KT-57889 K2: false-positive lack of information for inline function‘s type parameter in case of builder-style inference from caller function’s return expression
• KT-57961 K2: Unresolved reference using dynamic lambda parameter
• KT-57911 K2: Contracts are not inherited by substitution overrides
• KT-57880 K2: false-positive argument type mismatch due to lambda receiver shadowing labeled outer lambda receiver when assigning lambda to variable
• KT-57986 K2: NPE on building Space
• KT-57873 K2: compiler FIR serialization crash on builder-style inference from lambda's return type
• KT-57941 K2: Assertion error on loading serializable class with non-serializable property compiled with K1 compiler
• KT-57947 K2: Incorrect resolution results when property type for invokeExtension is not inferred
• KT-58002 K2: compiler FIR serialization crash on platform type with type-targeted Java annotation with Java enum as argument
• KT-57263 K2/MPP/JVM: compiler codegen crash on expect-property as default argument for expect-function's parameter
• KT-56942 K2: False-negative NO_ELSE_IN_WHEN if subject is flexible type
• KT-56687 Unexpected behaviour with enum entries when using outdated stdlib
• KT-56398 K2/MPP: compiler backend crash on inheritance from expected interface
• KT-57806 K2: string interpolation as annotation parameter causes error
• KT-57611 K2: Annotation arguments are not evaluated
• KT-56190 [K2/N] Const initializers are not serialized to klib
• KT-57843 K2: Missing diagnostic when calling constructor through typealias whose expansion has a deprecation
• KT-57350 FIR: deprecation diagnostic is not reported on a super class call
• KT-57532 K2: IrActualizer doesn't handle properties overloaded by extension receiver correctly
• KT-57776 K2: Suppressing “INVISIBLE_REFERENCE” leads to AssertionError: Unexpected IR element found during code generation
• KT-57769 [K2] Load properties in proper order for classes compiled with kotlinx.serialization and LV < 2.0
• KT-57879 K2: compiler FIR serialization crash on passing Java constants as arguments to type-targeted annotations
• KT-57893 K1/K2 inconsistency on smart casts of internally visible properties in friend modules
• KT-57876 K2: stack overflow in compiler FIR deserialization on nested type-target annotation class used in enclosing class
• KT-57839 K2: Compiler crash on lambda returning anonymous object with implemented lambda
• KT-57822 K2: Can't refer to external interface from class literal
• KT-57809 K2: No value passed for parameter of external class
• KT-56383 Build intellij master with LV 1.9
• KT-57735 K2: MPP: K2 reports hides member of supertype and needs ‘override’ modifier for the function with @PlatformDependent annotation when there is an empty linux target in project
• KT-55056 Builder inference causes incorrect type inference result in related call
• KT-57689 K2: Unresolved reference to nested typealias in KLIB
• KT-57665 K2: incorrect resolution of dynamic type
• KT-57381 K2/MPP/Native: impossible to override Any::equals with non-external function
• KT-57654 K2: Lambda with receiver deserialized as lambda without receiver during metadata compilation
• KT-57662 K2: The error message is poorly formatted and not precise in case of NO_ACTUAL_CLASS_MEMBER_FOR_EXPECTED_CLASS error and @Suppress is used
• KT-57763 FirExtensionRegistrar extension point broken
• KT-57312 K2: IR interpreter fails on string interpolation with const val from a klib involved
• KT-57768 Don't decompile code to search for annotation arguments
• KT-55628 Diagnostics for kotlin.concurrent.Volatile annotation applicability
• KT-55860 K2. [CONFLICTING_INHERITED_MEMBERS] for inheritor of a class with overloaded generic function
• KT-53491 K2: Implement “Operator ‘==’ cannot be applied to ‘Long’ and ‘Int’” error
• KT-55804 K2: UNSAFE_CALL Non-nullable generic marked as nullable even if non-null asserted
• KT-57682 K2: Incorrect composing of signatures for calls on dynamic types
• KT-55405 K2: false-negative INVISIBLE_REFERENCE in import directives
• KT-54781 K2: no error on unresolved import statement with more than one package
• KT-57635 K2/MPP: Expect constructors are not considered as expect during metadata deserialization
• KT-57376 K2/MPP: false-positive K/JS diagnostic in absence of K/JS target when sharing a source set between K/JVM and K/Native
• KT-55902 K2: Support ImplicitIntegerCoercion annotation
• KT-56577 Migrate Native KLIB ABI compatibility tests to K2
• KT-56603 [K2/N] Segfault invoking fun from binary compatible klib
• KT-57457 K2: the error message is not quite informative in case of EXPOSED_PROPERTY_TYPE_IN_CONSTRUCTOR_ERROR
• KT-57568 K2: K2, Native reports overload resolution ambiguity
• KT-57446 K2: Adapter function reference is not generated inside when expression
• KT-54894 K2: False positive RETURN_TYPE_MISMATCH on function which returns a functional type with @UnsafeVariance argument
• KT-57001 K2 compilation fails due to nullabillity subtyping not working properly
• KT-57271 Delay forbidding inference to an empty intersection to version 2.0
• KT-57209 K2: type parameters are available in companion object scope
• KT-50550 False positive NO_ELSE_IN_WHEN with annotated when branch condition
• KT-57431 K2 MPP JS: Compiler crash on transitive common dependencies
• KT-57456 K2 reports uninitializied variable in enum class when variable is used in lambda and defined in companion object
• KT-57583 K2/MPP/JS&Native: FIR2IR compiler crash on reference to Any method inherited by expect-classifier
• KT-56336 [K2/N] Multiplatform test fails with unexpected “actual declaration has no corresponding expected declaration” compiler error
• KT-57556 K2: Rename error ‘This API is not available after FIR’
• KT-23447 Integer.toChar compiles to missing method
• KT-46465 Deprecate and make open Number.toChar()
• KT-49017 Forbid usages of super or super if in fact it accesses an abstract member
• KT-56119 BinaryVersion.isCompatible binary compatibility is broken
• KT-57369 K2/MPP: supertypes established in actual-classifiers from other source sets are not visible
• KT-55469 [K2/N] equals(Double,Double) and equals(Boolean,Boolean) are not found
• KT-57250 K2: the metadata is serialized for an expect class even if the actual class is present when compiling to klib
• KT-56660 K2/MPP: compiler backend crash on invoking a K/Common constructor in K/JS code
• KT-55055 K1: Builder inference violates upper bound
• KT-57316 Initialize Enum.entries eagerly: avoid using invokedynamics
• KT-57491 Kotlin synthetic parameter looks ordinary
• KT-56846 K2: incorrect line & symbol numbers in exception reporting
• KT-56368 K2/MPP: compiler backend crash on missing actual declaration
• KT-57104 K2: false-positive conflicting inherited JVM declarations error despite use of @JvmName in another module
• KT-56747 [K2/N] Return type for lambda: (Any) -> Any which returns Unit is different for K1 and K2 and return statement is missing with K2
• KT-57211 K2: incorrect “error: an annotation argument must be a compile-time constant” on unsigned array in annotation argument
• KT-57302 K2 fails with IllegalStateException on reading inherited property of Java enum
• KT-57424 K2 IDE: “By now the annotations argument mapping should have been resolved” exception
• KT-57241 K2 MPP: Actualization doesn't work for actual enum that has primary constructor with arguments
• KT-57210 K2 MPP: Support of arguments with dynamic type
• KT-57182 K2 MPP: Actualization doesn't work for nested objects
• KT-56344 K2: Implement correct errors reporting of IrActualizer
• KT-54405 K2 compiler allows val redeclaration
• KT-54531 [K2] Uncaught Runtime exception is thrown instead of user friendly error messages with details in case -no-jdk option set to true
• KT-56926 K2: incorrect line number generated for class constructor or method with default parameter when comment before
• KT-56913 K2: Incorrect line numbers in overriden field getters and setters
• KT-56982 K2: Incorrect line number start in when expression
• KT-56720 K2: false positive MANY_IMPL_MEMBER_NOT_IMPLEMENTED in case of delegation in diamond inheritance
• KT-57175 K2: false-positive INVALID_TYPE_OF_ANNOTATION_MEMBER on type aliases
• KT-25694 Fix reporting of uninitialized parameter in default values of parameters
• KT-57198 K2: false-positive type mismatch error on inherited raw-typed class with type parameters in upper bounds of other type parameters
• KT-15470 Inconsistency: use-site ‘set’ target is a compilation error, use-site ‘get’ target is ok
• KT-57179 FIR: preserve prefix increment behavior like in K1 by calling getter twice
• KT-57405 K2. Function call ambiguity error when nullable String is passed to function with Spring @Nullable annotation in signature
• KT-57284 K2: compiler codegen crash at property initialization in constructor after smartcast of dispatch receiver to indirectly derived type
• KT-57221 K2: compiler FIR2IR crash on function's unavailable cached type parameter
• KT-57036 Unresolved reference: with inferred type of class constructor with extension parameter
• KT-56177 K2: FIR should not generate annotation on both property and parameter
• KT-54990 NI: Type mismatch when encountering bounded type parameter and projections
• KT-57065 K2: overload resolution ambiguity between type-aliased constructor and identically named function
• KT-49653 Deprecate and remove Enum.declaringClass synthetic property
• KT-57190 K2: false-positive unsafe call error on safe call on type-aliased nullable receiver in SAM-conversion
• KT-57166 K2: false-positive val reassignment error when synthetic property with implicitly typed overridden getter is called from implicitly typed member that is declared earlier
• KT-55828 [K2/N]: Fix test fails in OPT mode : Internal compiler error: no implementation found ... when building itable/vtable
• KT-56169 False negative deprecation warning about future inference error with builder inference
• KT-56657 K1/K2: inconsistent behavior in nullability mismatch (Guava hash set/map)
• KT-57105 K2: compiler codegen crash at property initialization in constructor after smartcast
• KT-56379 K2: build tests for the Kotlin standard library
• KT-56079 K2: build YouTrack 2022.3
• KT-57092 K2: false-positive multiple inherited implementations error
• KT-56696 K2: Allow to access uninitialized member properties in non-inPlace lambdas in class initialization
• KT-56354 K2/MPP: unresolved references to library entities
• KT-57095 K2: false-positive lack of type arguments error on raw cast of Base<*> to Derived: Base<T?>
• KT-56630 FIR: ClassCastException on compilation hierarchy with a raw type
• KT-57171 K2: Implement bytecode tests
• KT-57214 K2: compiler FIR crash on annotation usage before annotation class declaration
• KT-57204 K2: callable reference to mutable property of inherited by delegation superinterface isn't properly resolved
• KT-57195 K2: false-positive VAR_TYPE_MISMATCH_ON_OVERRIDE on changing property's platform type to non-nullable type when overriding
• KT-56814 K2. PsiElement is null inside IrClass. As a result ClassBuilder defineClass gets null as origin
• KT-54758 Deprecate ClassBuilderInterceptorExtension.interceptClassBuilderFactory and provide another method without dependency on K1
• KT-57253 K2: clean up callable reference logic in FIR2IR
• KT-56225 K2. “BackendException: Backend Internal error: Exception during IR lowering” error on incorrect constructor in inline class
• KT-56769 K2. Annotation applicability is ignored during compilation when there's use-site @target
• KT-56616 K2: cannot infer Java array type properly
• KT-57247 K2: false-positive INVALID_TYPE_OF_ANNOTATION_MEMBER on type-aliased vararg property
• KT-57206 K2: false-positive val reassignment error on synthetic property from generic class with overridden getter but not setter
• KT-56519 K2: Compiler crash on a function reference on companion receiver that inherits from outer class
• KT-56506 K1/K2 inconsistency: VAL_REASSIGNMENT on synthetic setter with different nullability
• KT-56877 K2: false-positive UNRESOLVED_LABEL for labeled this-expression in contract description
• KT-56863 K2: false-positive property initialization analysis errors after smartcast
• KT-56864 K2: Unexpected behavior with default parameter inheritance and function reference
• KT-56665 K2: false positive RECURSIVE_TYPEALIAS_EXPANSION
• KT-53966 K2 does not support SAM conversions with condition into Java/Kotlin functional interfaces
• KT-56659 FIR: Increment operator on object leads to exception from resolve
• KT-56771 FIR: Increment operator on qualified expressions leads to exception from resolve
• KT-56759 K2: False-positive UNRESOLVED_REFERENCE on labeled desctructuring declaration in LT mode
• KT-56548 K2: false positive overload resolution ambiguity for Java record constructor
• KT-56476 K2: false positive NO_RETURN_IN_FUNCTION_WITH_BLOCK_BODY at inline fun use-site
• KT-56138 K2: Illegal conversion of lambda with parameters to ExtensionFunction expected type
• KT-56448 K2: False-positive unsafe call due to incorrect inference of smartcasted type
• KT-55966 K2: Not enough information to infer type variable K if smartcast is used
• KT-57168 K2: compiler FIR2IR crash on synthetic property from generic class with overridden getter but not setter
• KT-56876 K2: false-positive UNRESOLVED_REFERENCE for name of nested class in contract description
• KT-57194 K2: overload resolution doesn't prioritize Double over Float
• KT-57067 Warning about expect/aсtual in the same module doesn't take into account absence of ‘actual’ modifier
• KT-56954 K2: function literals can be passed as arguments to parameters with kotlin.reflect function types
• KT-55423 K2: Implement CONTRACT_NOT_ALLOWED
• KT-56923 K2: no line number in bytecode when ASTORE exception in catch
• KT-56829 K2: compiler FIR2IR crash on passing to function a callable reference to nested class's constructor with default arguments
• KT-57029 Per-file caches fail on local inline function in an inline function
• KT-57085 K2: @Suppress is sensitive to its argument's case
• KT-57103 K1: AssertionError: Mismatching type arguments: 0 vs 1 + 0 when calling inline function with callable reference to generic synthetic property
• KT-57033 Make KtClassLiteralExpression stub based
• KT-57035 Make KtCollectionLiteralExpression stub based
• KT-40857 Invalid parameterized types for extension function on parameterized receiver when javaParameters=true
• KT-56154 Compiler backend crash on reference to Java synthetic property from generic class
• KT-56692 StackOverflow in PrivateInlineFunctionsReturningAnonymousObjectsChecker
• KT-55879 Modularized tests: fir.bench.language.version is used as API version, not language version
• KT-51821 ClassCastException on anonymous fun interface implementation when unrelated vararg is used
• KT-56820 K2: compiler FIR crash on Java field access after smartcast
• KT-56579 [K2/N] IR actualizer crashed with K2 on expect annotation marked with @OptionalExpectation, without actual.
• KT-56750 K2: “IllegalArgumentException: No argument for parameter VALUE_PARAMETER” when calling typealias method reference
• KT-55614 K2: consider serializing static enum members (values/valueOf/entries) to match K1 behavior
• KT-30507 Unsound smartcast if null assignment inside index place and plusAssign/minusAssign is used
• KT-56646 K2: “IllegalStateException: No single implementation found for: FUN FAKE_OVERRIDE” when compiling a functional interface
• KT-56334 K2: can't call expected function with default arguments
• KT-56514 K2 should report ACTUAL_TYPE_ALIAS_NOT_TO_CLASS
• KT-56522 K2 should report ACTUAL_FUNCTION_WITH_DEFAULT_ARGUMENTS
• KT-56910 Exception during IR lowering: Cannot determine lineNumber of element FUN name:cancelProgress
• KT-56542 K2: false positive TOO_MANY_ARGUMENTS in VarHandle.set call
• KT-56861 FIR: test FirPluginBlackBoxCodegenTestGenerated.testClassWithAllPropertiesConstructor is failing with runtime error
• KT-56234 K2: “ISE: Expected value generated with NEW” with inline property setter and noinline parameter
• KT-56722 K2: cannot resolve component call after smart cast
• KT-56875 K2: isOperator flag is incorrectly set for java methods
• KT-56714 K2: wrong argument mapping in DSL
• KT-56723 K2: lambda accidentally returns Unit? instead of Unit
• KT-55877 K2: Secondary constructor without call to parent: no frontend error, ISE: “Null argument in ExpressionCodegen for parameter VALUE_PARAMETER”
• KT-56386 K2: Make possible to access Java field which is shadowed by Kotlin invisible property`
• KT-56862 Compatibility problem with using Kotlin in Intellij 223 or higher because of missing particular trove4j dependency
• KT-55088 JS, Native compilation fail with internal error on SomeEnum.entries reference when SomeEnum is from klib compiled with disabled EnumEntries language feature
• KT-40904 No warning when declare actual in the same target (module) as expect
• KT-56707 K2: Unexpected TYPECHECKER_HAS_RUN_INTO_RECURSIVE_PROBLEM where only getter type specified explicitly
• KT-56508 Context receivers: Internal compiler error when compiling code containing a class with a secondary constructor
• KT-56706 K2: False-positive ARGUMENT_TYPE_MISMATCH for generic nested types from library
• KT-56505 K2: Missing NO_EXPLICIT_VISIBILITY_IN_API_MODE errors on various declarations
• KT-56682 K2: False-negative UNINITIALIZED_VARIABLE on access to delegated property
• KT-56678 K2: False-negative UNINITIALIZED_VARIABLE if corresponding variable has initializer
• KT-56612 K2: false positive NO_TYPE_ARGUMENTS_ON_RHS on raw cast with type alias based argument
• KT-56445 K2: False-positive unresolved reference to callable reference to function with default argument
• KT-55024 K2: overload resolution ambiguity/unresolved reference if variable is smart-casted to an invisible internal class
• KT-55722 K2: Incorrect OVERLOAD_RESOLUTION_AMBIGUITY with smart cast on dispatch receiver (simple)
• KT-56563 Inference within if stops working when changing expected type from Any to a different type
• KT-55936 K2: Support proper resolution of callable references as last statements in lambda
• KT-45989 FIR: wrong callable reference type inferred
• KT-55169 K2: False-negative NO_ELSE_IN_WHEN
• KT-55932 K2. No compiler error when elvis operator returns not matched type
• KT-53987 K2: False negative “TYPE_MISMATCH” with if statement return
• KT-41038 NI: TYPE_MISMATCH when passing constructor of nested class
• KT-42449 Can not resolve property for value of type Any even after casting type to a type with star projection
• KT-52934 StackOverflow from PseudocodeTraverserKt.collectDataFromSubgraph with if inside finally
• KT-52860 StackOverflowError when casting involving recursive generics and star projection
• KT-52424 ClassCastException: Wrong smartcast to Nothing? with if-else in nullable lambda parameter
• KT-52262 TYPE_MISMATCH: Nonnull smartcasting fails with non-exhaustive when
• KT-52502 Forbid extension calls on inline functional parameters
• KT-51045 SETTER_PROJECTED_OUT: Star projected nullable property can't be set to null
• KT-40480 [FIR] Support hasStableParameterName from metadata
• KT-50134 NI: Type inference regression in java streams groupingBy
• KT-50160 False positive “USELESS_CAST” caused by indexed access operator
• KT-42715 Unable to use implicit lambda param it for overloaded methods
• KT-49045 False positive USELESS_CAST in generic type with nullable type parameter
• KT-49024 AssertionError: Variance conflict: type parameter variance ‘out’ and projection kind ‘in’ cannot be combined
• KT-48975 Type mismatch: inferred type is X but Nothing! was expected with the AssertJ latest version
• KT-47870 INVISIBLE_MEMBER: Kotlin class can't access protected annotation defined in Java parent class
• KT-47495 ReenteringLazyValueComputationException on invalid code
• KT-47490 Missed diagnostic for incorrect callable reference in finally
• KT-47484 “Recursion detected in a lazy value under LockBasedStorageManager” on invalid code
• KT-46301 Combining branches with sealed interfaces in when breaks type inference
• KT-44392 False negative: redundant nullability/not null check on cast with as operator
• KT-43936 Recursion detected on input: ANNOTATION_ENTRY with annotation on star-imported nested class
• KT-43846 No smart cast when returning function closures with captured smart-cast variable
• KT-43603 False positive USELESS_CAST leads to TYPECHECKER_HAS_RUN_INTO_RECURSIVE_PROBLEM on “when” with smart cast and extension property
• KT-43553 JVM / IR: “AssertionError: Unbound symbols not allowed” caused by annotation class with TYPE target
• KT-42169 False negative CAST_NEVER_SUCCEEDS for incompatible types with generic parameter and star projection
• KT-42136 NI: False positive [USELESS_CAST] when list serves to create a mutable list
• KT-41721 SAM conversion fails on varargs with type approximated to Nothing
• KT-38288 Unresolved reference for type parameter upper bound of nested class when outer class extends it with star projected type argument
• KT-37490 NULL_FOR_NONNULL_TYPE: “Null can not be a value of a non-null type Nothing” when null is passed to nullable argument of type projected method
• KT-37365 NPE from ReflectionReferencesGenerator.generateCallableReference with inner class function reference and wrong parenthesis
• KT-36958 NI: missed unresolved on parenthesized callable reference passing through call (back-ends throw an exception)
• KT-30756 No smartcast if elvis operator as a smartcast source in while or do-while is used as the last statement
• KT-24737 Report an error on invalid this-expression with angle brackets on left-hand side of a callable reference
• KT-21463 Compiler doesn't take into accout a type parameter upper bound if a corresponding type argument is in projection
• KT-6822 Smart cast doesn't work inside local returned expression in lambda
• KT-55840 Inconsistency between members of enums in bytecode between FE 1.0 + JVM IR and FIR + JVM IR
• KT-47815 JVM: “Recursion detected in a lazy value under LockBasedStorageManager” when trying to inherit interface from a class with non-trivial function
• KT-17817 No error reported on invalid LHS for class literal
• KT-47373 Missed diagnostics on/after non-null assertion (!!) on generic class class use with class literal
• KT-51143 Wrong Unit-requiring at if/when branch with stub types
• KT-53671 False-positive diagnostic reported on OptIn annotation import from root package
• KT-53494 Mistaken type inference in compound ‘if’ expression with nullability check and covariant type
• KT-28668 “AssertionError: Unrelated types in SAM conversion for index variable” if lambda argument of ‘[...]’ in LHS of augmented assignment is used as an implementation for different SAM interfaces
• KT-55931 Inference for callable reference inside synthetic calls for if/when/try/etc stops working when brought into lambda for a call
• KT-20223 Inline access check ignores operator calls to invoke()
• KT-54478 @NoInfer causes CONFLICTING_OVERLOADS
• KT-56472 K2: Add stack of all FIR elements to CheckerContext
• KT-41126 [FIR] Inconsistency of a compiler behaviour at init block for an enum entry with and without a qualifier name
• KT-54931 Annotations defined in nested classes cannot be instantiated directly
• KT-52338 “IncompatibleClassChangeError: Expected non-static field” with Kotlin class with same-named companion object property as base Java class field
• KT-24901 No smart cast for when with early return
• KT-53086 “Cannot access ‘’ before superclass constructor has been called” with inner class secondary constructor
• KT-55137 Callable references with conversion are incorrectly allowed to be promoted to KFunction
• KT-30497 EXACTLY_ONCE contract doesn't work in a function with vararg parameter
• KT-47074 Front-end Internal error: Failed to analyze declaration State / java.lang.IllegalStateException: Should not be called! when try to add Parcelize
• KT-24503 Return-as-expression is allowed as this/super constructor parameter
• KT-55379 False positive NO_ELSE_IN_WHEN with smartcast to Boolean
• KT-47750 False positive NO_ELSE_IN_WHEN in presence of smartcast to sealed interface
• KT-53819 False positive UNINITIALIZED_VARIABLE with secondary constructor and custom property getter in local class
• KT-56457 JVM: Enum.entries are not annotated with @NotNull
• KT-56072 K2. “IllegalStateException: Fir2IrSimpleFunctionSymbol for is already bound” when trying to access java synthetic property of inherited class
• KT-50082 Kotlin non-overriding property of subclass doesn't shadow same-named Java field from base class
• KT-55822 False positive ABSTRACT_CLASS_MEMBER_NOT_IMPLEMENTED with raw types and mixed overridden members
• KT-55666 K2: label on local function is rejected: “Target label does not denote a function”
• KT-56283 False-positive INVISIBLE_MEMBER on overridden member of more specific type after smart cast
• KT-51969 [FIR] Compilation for expect value class fails with “Fir2IrSimpleFunctionSymbol for [declaration] is already bound”
• KT-56329 K2: compiler backend crash on two expected functions with similar signatures
• KT-56361 K2/MPP: receiver isn't available in lambda literals with receiver
• KT-55295 K2/MPP: JS build functionality
• KT-55909 [K2/N] IndexOutOfBoundsException for a reference to a function defined in companion object superclass
• KT-55664 K2: eliminate ClassId.isSame call from FirClass.isSubclassOf
• KT-56353 K2. False negative “Unresolved reference” in default value of secondary constructor's parameter
• KT-56381 K2: Function type kind not extracted from lambda literal in generic call
• KT-55747 K2. “Convention for ‘mod’ is forbidden. Use ‘rem’” error is missing
• KT-56104 Unnecessary inner classes attributes in class files for subclasses
• KT-55570 K2: ACTUAL_WITHOUT_EXPECT error is not reported on a simple actual class
• KT-56176 [K2/N] “IllegalStateException: actual type is kotlin.Int, expected kotlin.Long” when expected type uses typealias
• KT-56229 K2: IllegalStateException (already bound) for triangle-like dependencies scheme with MPP scenario
• KT-56199 K2 + MPP + kotlinx.serialization: java.lang.VerifyError: Bad type on operand stack in aaload
• KT-56212 K2: Exception when compiling extension function declaration with illegally chained type parameter receiver
• KT-55503 K2: “Argument type mismatch” caused by using the wrong “this”
• KT-56050 K2: inconsistency regarding visibility of synthetic properties with protected getter and public setter
• KT-49663 FIR: Support @kotlin.jvm.PurelyImplements for java collections
• KT-55468 [K2/N] Crash with debuginfo caused by changed tree using IMPLICIT_COERCION_TO_UNIT
• KT-56269 [K2/N] Don't test “Tailrec is not allowed on open members” in K2
• KT-54647 K2: Function call with Lambda on LHS of assignment leads to KotlinExceptionWithAttachments: FirDeclaration was not found for class org.jetbrains.kotlin.psi.KtFunctionLiteral
• KT-54648 K2: Function call on left side of erroneous assignment isn't resolved
• KT-55699 K2. False Negative “Type parameter T is not an expression”
• KT-56132 Restore ‘JvmBackendContext’ constructor signature for compatibility
• KT-55973 K2: Exception from UnusedChecker on an unused destructuring
• KT-56275 K2 IDE: Missed error for enum super type
• KT-54775 K2. “IllegalStateException: Expected FirResolvedTypeRef with ConeKotlinType but was FirImplicitTypeRefImpl ” exception on incorrect code
• KT-55528 K2: CFA for property initialization analysis is not run for class initialization graphs
• KT-54410 K2: Deprecation warning instead of “this declaration is only available since Kotlin X” when language version in project are below required to use language feature
• KT-55186 K2: No compilation error on calling exception without constructor
• KT-36776 Treat special constructions (if, when, try) as a usual calls when there is expected type
• KT-50947 False negative: FE 1.0 doesn't report type variance conflict error on an inner type
• KT-39041 Collection literals should not be allowed inside annotation classes
• KT-54694 Consider enabling BooleanElvisBoundSmartCasts in K1 or K2
• KT-54587 K2. CCE on compilation when some operator fun is needed and it is implemented as an extension function for another class
• KT-52774 Resolve unqualified enum constants based on expected type

Docs & Examples

• KT-53643 Update coding style conventions to include rangeUntil operator
• KT-57902 Create migration tutorial from kotlin-js to kotlin-multiplatform gradle plugin
• KT-58381 [Docs][Libraries] Document Path.createParentDirectories

IDE

Performance Improvements

• KTIJ-23501 Make main run configuration detection lighter
• KT-56613 Reduce memory consumption of light classes

Fixes

• KTIJ-25855 Infinite “Analyzing...” on .kt files from native source-set
• KTIJ-25448 When project JDK is less than one defines in jvmToolchain block run with Idea fails with has been compiled by a more recent version of the Java Runtime
• KTIJ-25673 Temporarily switch off adding jvmToolchain to new/converted Kotlin projects
• KTIJ-25719 K/Wasm: Fix import of wasm projects with Kotlin 1.9.0
• KTIJ-24136 Files with actual declarations are not highlighted in kotlinx.coroutines project
• KTIJ-24390 Kotlin assignment plugin: Imports are not recognized in build logic .kt files for Gradle build
• KTIJ-24695 Default Kotlin project can not be synced on Mac M1
• KTIJ-25302 Wrong variant of serialization plugins is passed to JPS build if the project was imported from Gradle
• KTIJ-25416 “Add import” works incorrectly without formatting the code for root package
• KT-57849 K2: contract violation due to implicit java type with annotation
• KTIJ-24666 Store annotation arguments in cls
• KTIJ-24667 Store constant expressions in cls
• KTIJ-24665 Store contracts in cls
• KTIJ-24543 An option to configure kotlin with JavaScript is available at Tools -> Kotlin menu
• KT-57857 LC: FakeFileForLightClass: Read access is allowed from inside read-action
• KTIJ-25172 Store flexible types in cls
• KT-57578 SLC: incorrect upper bound wildcards
• KT-57917 Analysis API: decompiled value parameters are not resolved
• KT-56046 K2 IDE: Avoid redundant resolve from annotations
• KT-57569 SLC: incorrect visibility for lateinit var with private setter
• KT-57547 SLC: non-last vararg value parameter type mismatch
• KTIJ-25034 K2 IDE: unresolved import treated as unused
• KT-57548 SLC: incorrect inheritance list for Comparator
• KT-56843 Light classes: certain kinds of constant values in property initializers aren't supported
• KTIJ-24676 Enum.entries is red if it's called on enum class from JDK or module without stdlib in dependencies
• KT-56868 SLC: IncorrectOperationException on enum annotation arguments that are not valid Java identifiers
• KTIJ-25048 K2: IDE K2: “Unexpected scope FirNameAwareCompositeScope”
• KTIJ-24895 K2 IDE: “Invalid FirDeclarationOrigin Synthetic” exception for synthetic “WHEN_CALL” function during highlighting
• KT-56833 Light classes: Accessors to lateinit properties don't have @NotNull annotations
• KTIJ-24768 IDE K2: “IllegalArgumentException Failed requirement at FirJvmTypeMapper”
• KT-56845 Light classes: Overridden property accessors don't have @Override annotation
• KT-56441 K2 IDE: reference from Java to ObjectName.INSTANCE of private object is red in IDE, but compiled successfully
• KT-56891 Symbol Classes: DefaultImpls classes contain methods without default implementation
• KTIJ-24742 K2 IDE: InvalidFirElementTypeException
• KTIJ-24067 K2 IDE: references from .java source to top-level Kotlin members from dependencies are unresolved
• KT-56842 Light Classes: Primitive-backed context receiver parameters shouldn't be marked with @NotNull
• KT-56835 Light classes: Underlying fields for delegated properties should be marked as final and @NotNull
• KT-56840 Light Classes: Inline classes backed by Java primitives shouldn't be marked with @NotNull
• KT-56728 K2 IDE. False positive not applicable to for kotlin annotation with target annotating Java element
• KTIJ-24610 K2: Exception from import optimizer: “Unexpected qualifier ‘10’ of type 'KtConstantExpression`”
• KTIJ-24476 Make application services to be classes instead of objects
• KTIJ-24574 K2 IDE: “No fir element was found for” from inspections
• KT-55815 SLC: Keep annotations on type when converting to PsiType
• KT-55669 K2 IDE: INRE from light classes
• KTIJ-24530 K2 IDE: status resolution fails with CCE
• KTIJ-23937 K2: No ‘JavaSymbolProvider’ in array owner: Source session for module
• KTIJ-24087 K2: Type parameter bounds found not analyzed during call inference
• KTIJ-24344 K2 IDE: Object reference incorrectly resolves to ‘invoke’ operator function
• KTIJ-24107 K2 IDE: Unresolved call for qualified companion invoke()
• KTIJ-24385 K2 IDE: KtCallExpression(KtCallExpression) should always resolve to a KtCallInfo

IDE. Code Style, Formatting

• KTIJ-24928 Organize imports puts imports in one line if Formatter option is used

IDE. Completion

• KTIJ-25108 K2 IDE: Code completion in Java context for Kotlin top level members: “Slow operations are prohibited on EDT” through KtAnalysisScopeProviderImpl.canBeAnalysed()
• KTIJ-24989 K2 IDE: completion should show information about expanded types for type alias parameters
• KTIJ-24992 K2 IDE: completion shows return type with incorrect nullability when type is stub type
• KTIJ-24948 K2 IDE: “ERROR: class org.jetbrains.kotlin.fir.types.jvm.FirJavaTypeRef cannot be cast to class org.jetbrains.kotlin.fir.types.FirResolvedTypeRef” during completion of inner classes' constructors
• KTIJ-24256 K2 IDE: Angle brackets are missing in completion of function with type parameters
• KTIJ-24083 K2, Completion: Exception on adding a type parameter receiver to a function
• KTIJ-23963 K2 IDE: Completion in Kotlin suggests overriding a Java field; fails with “Unknown member to override”
• KTIJ-22359 K2 IDE: no completion for Java synthetic properties from super class
• KTIJ-23880 Completion doesn't work for Java synthetic property reference

IDE. Decompiler, Indexing, Stubs

• KTIJ-25152 Kotlin Bytecode tool window: ISE Symbol with IrSimpleFunctionSymbolImpl is unbound on actual callable with argument in mpp project with IR
• KTIJ-24475 Migrate kotlin index extension implementation from object to classes
• KTIJ-24335 Kotlin Bytecode tool window: NoSuchElementException caused by duplicate Boolean type descriptor in JvmSharedVariablesManager.getProvider
• KTIJ-24206 Kotlin Bytecode tool window: “Unhandled intrinsic in ExpressionCodegen” when compiling a source file with an expect function
• KTIJ-15764 IR by default in Kotlin bytecode tool window

IDE. Gradle Integration

• KT-59034 MPP build failed with “Factory type is not known for plugin variants” in kt-231-*
• KT-56671 KGP import: K/N distribution libraries should'n be resolved for IDE by KGP with package names
• KTIJ-24573 KGP-based import: commonized cinterop libraries don't include source set targets, unsupported by host
• KTIJ-25757 KJS: 1.9.0-Beta fails to run when running in Android Studio
• KTIJ-24701 KGP import: JVM+Android shared source sets don't receive a correct default stdlib dependency
• KTIJ-24745 IDE sync of kotlin(“js”) projects with js(BOTH) set fails with exception because of the new MPP IDE import
• KTIJ-24567 Enable KGP dependency resolution by default
• KTIJ-24729 KotlinMPPGradleProjectResolverKt must not be requested from main classloader on project import
• KTIJ-11978 IDE does not recognize the sources JAR of a published to mavenLocal MPP library

IDE. Inspections and Intentions

• KTIJ-24684 K2 IDE: ‘Redundant qualifier name’ false positive in type specification in extension function
• KTIJ-24662 K2 IDE: False positive “Redundant qualifier name” inspection for nested class from base interface
• KTIJ-25232 K2 IDE: “Redundant qualifier name” inspection false positive with object referenced via property
• KTIJ-25447 Make Enum.entries and RangeUntil inspections don't check for opt-in when APIs become stable
• KTIJ-23588 K2 IDE. False positive unused import directive for extension function of an object
• KTIJ-25112 K2 IDE: False positive “Actual value of parameter ‘b’ is always ‘null’”
• KTIJ-24485 Explicit API mode: false positive “redundant ‘public’ modifier”
• KTIJ-24453 Unsuccessfull resolve error from OperatorToFunctionIntention on recursive property declaration

IDE. JS

• KT-58427 Kotlin Gradle Plugin ignores language version value for Kotlin/JS sources

IDE. Libraries

• KTIJ-25096 K2 IDE: Library sessions are garbage collected between performance test runs with enabled library caches
• KTIJ-24413 Cannot navigate to enum of the Kotlin library via entries call

IDE. Misc

• KT-58763 K2 IDE: NoSuchMethodError: KtPsiFactory$Companion.contextual
• KTIJ-25304 Move IDE Extension Points from compiler.xml to the IDE repository
• KTIJ-24893 K2 IDE: Serializable plugin causes infinite resolve recursion

IDE. Multiplatform

• KTIJ-25859 MPP: Library wizard with android target uses deprecated androidTest source set
• KTIJ-25479 Compiler options is not imported correctly for js source sets
• KTIJ-24011 MPP: Native tests are missing run gutters

IDE. Navigation

• KTIJ-23073 K2 IDE: Navigation doesn't work from library sources to another library sources
• KTIJ-24819 K2 IDE: support compiler reference index
• KTIJ-24697 K2 IDE: handling PresistenceMap in LLFirSessionsCache takes a lot of time
• KTIJ-24373 K2 IDE: Qualified generic type is not fully resolved

IDE. Run Configurations

• KTIJ-25046 K2 IDE. Junit5 test method with internal modifier can't be launched using gutter

IDE. Wizards

• KTIJ-25932 Turn off the adding new targets in Kotlin Multiplatform Wizard
• KTIJ-26022 Project module not selected in a second page of “New Project” window in KMP wizard
• KTIJ-24834 Set default for “kotlin.mpp.experimental” flag for K/JS features to true

JavaScript

New Features

• KT-12784 JS: generate ES2015 compatible modules
• KT-48154 KJS / IR: Inline members support for external types
• KT-51582 FIR: support basic compile-time evaluation for JS backend

Fixes

• KT-43490 KJS / IR: “Cannot set property message of Error which has only a getter” caused by class that is child of Throwable
• KT-57690 K2/MPP: compileProductionLibraryKotlinJs fails with Module has a reference to symbol kotlin/arrayOf|3204918726020768747[0]. Neither the module itself nor its dependencies contain such declaration
• KT-56911 K2/MPP: Compile K/JS fails for @Serializable annotation with class IrDeclarationOrigin$GeneratedByPlugin cannot be cast to class IrDeclarationOriginImpl
• KT-56950 Support KLIB IC with K2
• KT-58570 KJS: ES6 classes + PL throw java.lang.NullPointerException
• KT-58835 K2/JS: Fix incremental compilation klib tests
• KT-58794 KJS / K2: Assertion failed with Space build
• KT-51706 Partial linkage: in case of absent symbol referred from declaration Native compiler is successful, JavaScript fails
• KT-54452 Kotlin/JS libraries with “joined” legacy+IR content: publish IR sources for them
• KT-53180 Kotlin/JS: generated TypeScript constructor can have “TS1016: A required parameter cannot follow an optional parameter” error with certain properties order
• KT-39650 KJS IR: provide a way to enable ES2015 class generation
• KT-57990 KJS/IR. Invalid super call for final parent methods (ES classes)
• KT-58246 KJS: ES15 classses — duplicated code in class constructor
• KT-57479 KJS: Add an annotation for a function parameter which checks that a passed argument has an external type
• KT-58201 Unknown statement type when building with ES modules
• KT-30810 values and valueOf are miscompiled for external enum classes
• KT-57024 Ugly TypeScript definitions for declarations with both @JsExport and @Serializable
• KT-56237 KJS + IC: Adding or removing interface default implementation doesn‘t invalidate children and doesn’t update JS code
• KT-54638 K2/JS: Fir2ir - implement and use JS-specific mangler
• KT-54028 Native / JS: Using private object implementing a sealed interface causes a linker error
• KT-57423 KJS: Add an annotation for external interfaces which allows to be inherited only by other external interfaces, classes or objects
• KT-57711 K2: Native & JS fail to compile a KLIB that uses const val from a dependency KLIB
• KT-57078 JS IC: Unbound symbol left in SymbolTable in JsIr[ES6]InvalidationTestGenerated.testBreakKlibBinaryCompatibilityWithVariance tests
• KT-57254 Deprecate external enum declarations
• KT-57002 KJS: “JsParserException: missing name after . operator” when a js(...) block contains an interpolated constant
• KT-56961 JS IR: serializedIrFileFingerprints in klib manifest has a wrong format
• KT-56282 KJS: Invalidate incremental cache in case of compiler internal errors

KMM Plugin

• KT-55402 “Framework not found SQLCipher”: after selection of “Regular framework” as “iOS framework distribution” and installing SqlCihper through CocoaPods
• KT-55988 KN debugger in KMM plugin for Android Studio can't recognize the source code

Language Design

New Features

• KT-48872 Provide modern and performant replacement for Enum.values()
• KT-15613 Introduce special syntax for the until operator
• KT-4107 Design and implement a solution for toString, equals and hashCode on objects (data object)

Fixes

• KT-28850 Prohibit protected visibility in final expected classes
• KT-39362 Expect fun interface must have actual fun interface counterpart
• KT-48994 Prohibit type unsound java fields assignments
• KT-58791 Prolongate PROGRESSION_CHANGE_RESOLVE diagnostics to 2.x
• KT-53778 Release stdlib API about “rangeUntil” operator in 1.9
• KT-53653 Export Enum.entries to Objective-C and Swift
• KT-55177 Deprecate declaration of expect and actual counterparts of same class in one module
• KT-49110 Prohibit access to members of companion of enum class from initializers of entries of this enum
• KT-47986 Forbid implicit inferring a type variable into an upper bound in the builder inference context
• KT-57395 Delay ForbidInferringPostponedTypeVariableIntoDeclaredUpperBound feature to LV 2.0
• KT-55082 Bump KLib version for Enum.entries
• KT-49264 Deprecate infix function calls of functions named “suspend” with dangling function literal

Libraries

New Features

• KT-58046 Stabilize remaining kotlin.time API: time sources, time marks, measureTime
• KT-58074 Stabilization of Atomics API in K/N
• KT-55268 Mutiplatform @Volatile annotation
• KT-51908 Provide common function for getting regex capture group by name
• KT-53263 Path.createParentDirectories
• KT-7637 Add toString() to standard delegates classes (NotNullVar, LazyVal, BlockingLazyVal, ...)
• KT-40728 Add AssertionError constructor with cause: Throwable parameter to common stdlib
• KT-57298 Avoid FileAlreadyExistsException from Path.createParentDirectories in case of parent is symlink

Performance Improvements

• KT-54739 build method in collection builders (Set, Map, List) should return a single instance for empty collections
• KT-42589 Provide common listOf(value) overload to avoid allocation of the vararg
• KT-55091 Stdlib: Sequence.toSet() and Sequence.toList() may create the collection twice
• KT-57617 Optimize ReversedListReadOnly iterator
• KT-57607 KJS: Bad performance for ArrayList.addAll

Fixes

• KT-58841 Serialization: NPE when obtaining a serializer of a sealed base class with a self-referencing property
• KT-57728 Explicitly specify level of stability of programmatically-accessible interoperability API
• KT-58985 Update KClass.isData KDoc
• KT-57762 Introduce HexFormat for formatting and parsing hexadecimals
• KT-55612 Stabilize experimental API for 1.9
• KT-58548 Stabilize standard library API for Enum.entries
• KT-56400 Disable compilation of atomicfu-runtime with legacy JS backend
• KT-58276 Deprecate redundant public declarations in kotlin.native.concurrent
• KT-35973 Extract org.w3c declarations from stdlib-js
• KT-58073 JS/Legacy compiler blocks compilation of kotlinx.atomicfu with K2
• KT-57317 Repack EnumEntries from stdlib into the compiler
• KT-54702 Native: mark Worker and related APIs as obsolete
• KT-55610 Deprecate kotlin.jvm.Volatile annotation in platforms except JVM
• KT-57404 Native: Support AnnotationTarget.TYPE_PARAMETER
• KT-57318 Change EnumEntries stdlib implementation to be eager
• KT-57137 Native: Consider removing ArrayAsList
• KT-56661 Missing EnumEntries-related bytecode in kotlin-stdlib-1.9.255-SNAPSHOT.jar
• KT-51579 PlatformImplementations loading is not compatible with graalvm native-image --no-fallback

Native

• KT-54098 Decommission and remove ‘enableEndorsedLibs’ flag from Gradle setup
• KT-52594 Provide Alpha support for Native in the K2 platform
• KT-56071 K2/MPP: Native build functionality
• KT-56218 [K2/N] Receiver annotations for properties are not serialized
• KT-56326 [K2/N] RemoveRedundantCallsToStaticInitializersPhase removes important static initializer
• KT-27002 lateinit intrinsics frontend checkers aren't applied on Native

Native. Build Infrastructure

• KT-58160 Native: performance build configuration fails with NoSuchMethodError: ‘boolean kotlinx.coroutines.CompletableDeferredKt.completeWith(kotlinx.coroutines.CompletableDeferred, java.lang.Object)’

Native. C and ObjC Import

• KT-54610 Kotlin Native can't call objc_direct functions
• KT-57918 [K2/N] Support typealiases in FirClassSymbol<*>.selfOrAnySuperClass()
• KT-58651 Native c-interop tool generates broken @Deprecated annotations
• KT-57541 Compilation fails without explicit cast on cinterop code
• KT-54805 KMP ios memory leak when using CA Layer
• KT-57490 [K/N] Duplicate package names for cinterop klibs with objc protocols fails to link

Native. ObjC Export

• KT-58839 K/N: Exception during HiddenFromObjC marked class extension function compiling
• KT-56464 K/N: Allow HiddenFromObjC for classes
• KT-57507 K2: Set of Objc exported declarations is different between K1 and K2

Native. Runtime

• KT-58441 Kotlin/Native: @ObjCAction @ObjCOutlet generate bridges without switching state
• KT-57091 Align Native and Java file/class initialization behavior

Native. Runtime. Memory

• KT-56233 [Kotlin/Native] Crash when enum values are accessed in multiple threads
• KT-58130 Implement preview of custom allocator for Kotlin/Native
• KT-56402 Native: if a Kotlin peer for an Obj-C object is created on the main thread, then Kotlin runtime should run objc_release for it on the main thread

Native. Stdlib

• KT-57344 Try to remove strange .equals overload on primitive types
• KT-57592 Native: Remove the default parameter value for AtomicLong constructor

Native. Testing

• KT-57349 Enable more K2 MPP codegen/box tests for Kotlin/Native
• KT-57026 K2: Fix Native test infrastructure for MPP

Reflection

• KT-54833 Reflection: Incorrect behaviour for Field.kotlinProperty function in companion objects
• KT-56650 ArrayStoreException from InlineClassAwareCaller.call with an array of inline class
• KT-56093 Metaspace leak in a Gradle plugin built with Kotlin 1.8.0
• KT-55937 Optimize implementation of kotlinFunction/kotlinProperty

Specification

• KT-58932 Specify the priority between candidates with type and value receivers when doing callable reference inference
• KT-54254 Specify that an annotation type cannot have itself as a nested element
• KT-53427 Specify @SubclassOptInRequired
• KT-53323 Add Enum.entries to Kotlin specification, KEEP-283
• KT-54255 Specify extension receivers are effectively noinline
• KT-53646 Incorporate rangeUntil (..<) operator into specification

Tools. CLI

• KT-57495 Add JVM target bytecode version 20
• KT-57154 Incorrect version of JDK is provided through CoreJrtFs
• KT-56209 Add CLI support for HMPP in K2
• KT-58351 Confusing error message when using removed -Xjvm-default mode value
• KT-57535 K2: Kotlin command line compiler doesn't see class files on the class path in 2.0
• KT-57644 K2: Prohibit passing HMPP module structure with CLI arguments to metadata compiler
• KT-56351 Reduce memory usage spent on compiler settings

Tools. Commonizer

• KT-57796 NoSuchFileException in :module-B:commonizeCInterop with Kotlin 1.8.20
• KT-56207 Investigate failing tests in ClassifierCommonizationFromSourcesTest

Tools. Compiler Plugins

Fixes

• KT-57821 K2: Compiler calls declaration generation plugins twice for classes in the common source set
• KT-57406 FIR Compiler plugins: Assignment plugin incorrectly recognizes qualified names of annotations
• KT-57626 K2: SERIALIZER_NOT_FOUND for serializable class from another module
• KT-57400 FIR Compiler Plugins: annotated predicate does not work with Java classes
• KT-57140 K2: Implement backwards compatibility for FirFunctionTypeKindExtension
• KT-56685 K2: ArrayIndexOfBound during session creation if compiler plugins are enabled
• KT-55375 Remove “legacy” mode of jvm-abi-gen plugin
• KT-53470 FIR: pass MemberGenerationContext to all methods of FirDeclarationGenerationExtension
• KT-51092 Lombok @Value causes IllegalAccessError
• KT-55885 K2 plugin API: Backend-only declarations are not visible from other modules
• KT-55584 K2: Improve registration of session components from compiler plugins
• KT-55843 FIR Plugin API: metaAnnotated predicate returns meta-annotation itself as well
• KT-53874 Optimize checking for plugin applicability and redesign DeclarationPredicates

Tools. Compiler plugins. Serialization

Fixes

• KT-58954 Serialization: NPE at run time when accessing a delegating property of a deserialized object
• KT-56537 Serialization: Presence of (transient) delegated field in the serialized class breaks deserialization
• KT-58918 Serialization: NPE at run time obtaining a serializer for a sealed class with a generic self-referencing property
• KT-59113 Serialization: NPE at run time when accessing a delegating property of a deserialized object
• KT-57647 Serialization: “IllegalAccessError: Update to static final field” caused by serializable value class
• KT-57704 K2/serialization: false-positive SERIALIZER_NOT_FOUND when compiling against 1.7.20 binary with enum class
• KT-57083 K2/serialization: can't resolve serializers for classes from other modules
• KT-56480 K2: false-positive warning about incompatible serializer type when using type aliases
• KT-56594 K2/serialization reports SERIALIZER_NOT_FOUND over aliased String or primitive types
• KT-56553 Support ‘serialization plugin intrinsics’ feature in K2
• KT-56244 kotlinx.serialization compiler intrinsic does not work with encodeToString function in 1.8.0

Tools. Daemon

• KT-50846 Remove “new” Kotlin daemon from codebase

Tools. Gradle

New Features

• KT-56971 Expose jvmTargetValidationMode property in KotlinCompile Gradle task
• KT-57159 Add project level compiler options for Kotlin/JVM plugin

Performance Improvements

• KT-57052 Gradle: Stop using exceptions for flow control
• KT-57757 Reduce classpath snapshotter memory consumption
• KT-56052 Implement an in-memory wrapper for PersistentHashMap to avoid applying changes to IC caches before successful compilation

Fixes

• KT-55624 Update KGP integration tests that use removed in Gradle 8 getClassifier method
• KT-59589 Gradle: ‘java.lang.NoClassDefFoundError: com/gradle/scan/plugin/BuildScanExtension’ on 1.9.0-RC when applying Enterprise Plugin from initscript
• KT-59063 Explicit API mode broken in Kotlin 1.9.0-Beta
• KT-57653 Explicit API mode is not enabled when free compiler arguments are specified in Gradle project
• KT-59256 [1.9.0-Beta] ServiceLoader does not pick up classes defined in the same project
• KT-58662 Gradle 8.1 + Configuration Cache: custom values data is missing from build report
• KT-58280 org.jetbrains.kotlin.jvm Gradle plugin contributes build directories to the test compile classpath
• KT-59191 Actual compilation failure exception might be hidden in the case of a Kotlin daemon crash
• KT-56211 Improve Kotlin build reports
• KT-57767 Gradle: “ZipException: invalid entry size” with 1.8.20
• KT-57736 K2: Introduce an easy way to try K2 compiler in Gradle user projects
• KT-59056 FreeCompilerArgs options added using ‘subprojects’ extension override module-level freeCompilerArgs options
• KT-55740 Gradle 8: Listener registration using Gradle.addBuildListener() has been deprecated
• KT-37652 Support explicit mode for Android projects
• KT-58251 Build Statistics. Kotlin-specific tags are missing in build scans if projects use Gradle 8+
• KT-57224 Add an indicator into build metrics report to show whether K1 or K2 compiler was used to compile the code
• KT-58571 ExplicitApi mode should not apply for test compilations
• KT-42718 Test and AndroidTest sources should be excluded from explicit API requirements for libraries
• KT-58916 [1.9.0-Beta] PLUGIN_CLASSPATH_CONFIGURATION_NAME and NATIVE_COMPILER_PLUGIN_CLASSPATH_CONFIGURATION_NAME should stay public or offer an alternative API
• KT-58869 K2, Gradle: Improve message “100% (2/2) tasks have compiled with Kotlin 2”
• KT-52811 Kotlin Serialization metadata issue due to incompatibility between Gradle Kotlin embedded version and Kotlin Gradle Plugin version
• KT-57330 Provide collection of usage statistics for the Dokka
• KT-57393 jvm-target value set through ‘android.kotlinOptions’ is ignored and overwritten with the default 1.8 value
• KT-58745 KaptGenerateStubs task should also be configured with the same compiler plugin options
• KT-58682 Explicit api mode does not apply in MPP projects
• KT-52976 Remove deprecated Gradle conventions usages
• KT-58530 Compiler plugin unbundling changes should be backward compatible with Kotlin plugin
• KT-36904 Adding folders to sourceSets.resources.srcDir() in Gradle script does not work
• KT-58313 An exception in console if no task is executed and file build reports are enabled
• KT-58619 Move all pm20 interfaces into Gradle plugin codebase
• KT-58320 Kotlin daemon OOM help message is missing on OOM in Kotlin Daemon itself
• KT-53923 Add ‘progressive’ compiler argument to Gradle compiler options
• KT-53924 Add ‘optIn’ compiler arguments to Gradle compiler options
• KT-53748 Remove KotlinCompile setClasspath/getClasspath methods
• KT-56454 Bump minimal support AGP version to 4.2.2
• KT-57397 Add infrastructure to use the build-tools-api to run compilation from Gradle
• KT-56946 Switch incremental Gradle tests for K2 to use language version 2.0
• KT-57782 Disable daemon fallback strategy for Gradle integration tests by default
• KT-57142 Split org.jetbrains.kotlin.gradle.tasks/Tasks.kt into several source files
• KT-54447 Remove usage of deprecated internal Gradle field in Kotlin Gradle Plugin, replace with equivalent in public API
• KT-49785 Avoid creating task output backups until really needed
• KT-56047 False positive message about full recompilation is displayed while restoring from build cache and then making a syntax error
• KT-56421 Gradle: plugin should not use BasePluginExtension deprecated properties
• KT-55241 Gradle: the VariantImplementationFactories build service state is not persistent making impossible to access factories with configuration cache lazily
• KT-56357 Gradle: “DefaultTaskCollection#configureEach(Action) on task set cannot be executed in the current context” because of VariantImplementationFactories
• KT-56352 Make build scan reports more readable
• KT-55972 Gradle: Add an assertion to all integration tests if warningMode is not FAIL, but the build doesn't produce any warnings

Tools. Gradle. Cocoapods

• KT-38749 Support reusing generated C-interop between dependant pods
• KT-54161 Support adding extra code to generated Podfile from the Kotlin gradle plugin
• KT-56162 Provide granular Gradle warnings suppression for CocoaPodsIT

Tools. Gradle. JS

New Features

• KT-48791 KJS: Support for Power(ppc64le) and Z(s390x)
• KT-32209 org.jetbrains.kotlin.js does not respect Gradle's archivesBaseName
• KT-52646 KJS / Gradle: make “KotlinCompilationNpmResolver already closed” a warning
• KT-52647 KJS / Gradle: Make “Projects must be configuring” a warning
• KT-56158 KJS: Support implementation dependencies

Fixes

• KT-59604 Unresolved reference: useKarma in convention plugin
• KT-57604 JS, Space: Circular dependency between tasks
• KT-59116 K/JS npm dependcies are not resolved properly on Kotlin 1.9
• KT-54731 KJS / Gradle: “There are multiple versions of “kotlin” used in nodejs build: 1.6.21, 1.7.20.” with kotlin-dsl in buildSrc
• KT-58970 browserTest gradle task fails if karma is used and gradle configuration cache is enabled
• KT-59004 Kotlin JS 1.9.0-Beta, yarn.lock is unstable in multi module project
• KT-56458 KJS / Gradle: Unnecessary and confusing “There are multiple versions of “kotlin” used in nodejs build” generated from YarnImportedPackagesVersionResolver
• KT-57985 K/JS: packageJson Gradle configurations don't inherit unique attributes from JsTarget DSL
• KT-57817 JS: executables for couple of JS targets builds in the same directory
• KT-58199 K/JS: Remove useCoverage method
• KT-57116 KJS / Gradle: commonWebpackConfig not applied if called after binaries.executable()
• KT-58522 K/JS: Upgrade NPM dependency versions
• KT-57629 K/JS: Change default destination of JS production distribution
• KT-57480 K/JS: Use IR compiler by default without explicit choosing of js compiler
• KT-58345 K/JS: Webpack task skipped with ES modules because files have mjs extension
• KT-58071 KJS / Gradle: jsNodeTest task is not incremental
• KT-43809 KJS: browserProductionExecutableDistributeResources tasks deletes distributions directory
• KT-56690 Kotlin2JsCompiler friendDependencies cannot be configured through friendPaths
• KT-57920 K/JS: Make imported NPM package not considering dev dependencies
• KT-56025 KJS / Gradle: Gradle 8.0 jsBrowserProductionWebpack uses the output of another project's jsProductionExecutableCompileSync
• KT-57630 K/JS: webpack updating twice on one change of kt sources
• KT-47351 KJS / IR: :jsTestPackageJson is unable to find nested included builds under composite build
• KT-44754 K/JS: browserRun --continuous keeps rebuilding without any changes
• KT-49774 KJS / Gradle: Errors during NPM dependencies resolution in parallel build lead to unfriendly error messages like “Projects must be closed”
• KT-57387 Remove support of webpack 4
• KT-57386 Kotlin/JS upgrade npm dependencies
• KT-56705 KJS / Gradle: Module name starting with ‘@’ isn't properly set when FUS is disabled
• KT-46428 KJS / IR: Composing build failed “Failed to create MD5 hash for package.json”
• KT-53687 Don't trigger npm and yarn related tasks if it not relevant for assemble
• KT-49915 KJS / Gradle: Gradle build cache miss because of absolute path in KotlinJsIrLink.filteredArgumentsMap
• KT-56192 KJS: In browser testing no original sources in stacktrace
• KT-42395 Kotlin/JS: Gradle DSL: PackageJson.customField() does not accept null
• KT-43305 Support Node.JS downloading for Ubuntu
• KT-48631 KJS: Unconditionally uses linux/x86 binaries
• KT-38015 NodeJS installation does not extract symlinks correctly (npm and npx)

Tools. Gradle. Multiplatform

New Features

• KT-34662 Provide an option for Android targets to compile & run commonTest tests as unit tests only, instrumented tests only, or both
• KT-55881 Add possibility to enable/disable sources publication similar to Java Gradle Plugin API

Fixes

• KT-59446 MPP: transformCommonMainDependenciesMetadata failing for api java dependency in shared jvm source set with Future was not completed yet
• KT-55751 MPP / Gradle: Consumable configurations must have unique attributes
• KT-57688 MPP: compileDebugKotlinAndroid task fails with llegalArgumentException: ‘moduleName’ is null!
• KT-56210 Pass module structure to CLI of K2 if K2 enabled
• KT-57531 KotlinNativeLink: StackOverflowError when consuming library with dependency cycles (from constraints)
• KT-58281 Kotlin Gradle Plugin: Enable Kotlin/Android SourceSetLayout v2 by default
• KT-57903 Prepare for migration to the pluggable android target plugin
• KT-49933 Support Gradle Configuration caching with HMPP
• KTIJ-25644 KGP import: ‘KotlinRunConfiguration’ won't be able to infer correct runtime classpath
• KT-58661 KGP: KotlinJvmTarget: Implement ‘run’ carrier task
• KT-59055 KotlinJvmRun not respecting jvmToolchain setting
• KT-57959 Module-name value can't be changed for the android target of a multiplatform project
• KT-55506 TCS: Gradle Sync: kotlin-stdlib-common is not filtered from JVM + Android source sets
• KTIJ-25732 Flaky: KotlinMultiplatformSmokeTests .testJvmAndNative
• KTIJ-25039 New import can add unresolved dependency as empty
• KT-57652 Don't expose sourcesElements for project2project dependencies
• KT-58601 Finalise “ExternalKotlinTargetApi” shape for initial 1.9 release
• KT-58710 External Target Api: Add API to control SourceSetTree
• KT-58488 Add a diagnostic message to KGP in case of val androidTest by getting usage
• KT-57482 cleanNativeDistributionCommonization is not compatible with configuration cache with gradle 8.0
• KT-58062 Commonizer configuration cache not compatible with Gradle 8.1
• KT-58086 Warn about using MPP libraries published in the legacy mode
• KTIJ-24254 KotlinProjectArtifactDependencyResolver returning too early
• KT-56439 TCS: Gradle Sync: IdeBinaryResolver: Add componentFilter API for compilations/configurations
• KT-57023 Cryptic Gradle task descriptions for compile tasks
• KT-58470 Warning about using MPP libraries published in the legacy mode is not reported if the dependency is declared in an intermediate source set
• KT-58466 K2 Gradle: non *.kt files are passed to -Xfragment-sources
• KT-58319 kotlin.git: ProjectMetadataProviderImpl “Unexpected source set ‘commonMain’”
• KT-51940 HMPP resolves configurations during configuration
• KT-58261 Link kotlin native binary framework tasks fails when configuration cache is enabled
• KT-41506 UnknownDomainObjectException: “KotlinSourceSet with name not found” when creating custom compilations after applying withJava to an MPP JVM target
• KT-58209 Do not use the term ‘Module’ in KotlinTargetHierarchy
• KT-56153 When the dependency is unresolved, import fails and don't import anything instead of degrading gracefully
• KT-56571 New import broke apiVersion for commonMain, commonTest and jvmAndAndroidMain modules
• KTIJ-24552 TCS: KotlinMppGradleProjectResolverExtension: Add ‘afterProjectResolved’ API
• KTIJ-24368 Multiplatform;Composite Builds: prepareKotlinIdeaImport not executed on included builds
• KTIJ-24377 Multiplatform;Composite Builds: Unresolved symbols from a root project of included build
• KT-56712 Multiplatform;Composite Builds: Classpath isolation: .MppDependencyProjectStructureMetadataExtractorFactory cannot be cast to class *MppDependencyProjectStructureMetadataExtractorFactory
• KT-56461 MPP: resolvableMetadataConfiguration: Ensure consistent resolution across all compile dependencies
• KT-56841 MPP: Module-to-module dependencies don't work inside included build in included build
• KT-42748 Project that transitively depends on composite build of multimodule multiplatform library cannot resolve dependencies properly
• KT-52356 MPP / Gradle: Missing common classes on KMM project integrated via Gradle included build into an Android application
• KT-51293 Unresolved references with hierarchical project structure when building KotlinMetadata from native-common source set
• KTIJ-24771 Multiplatform: Composite builds do not resolve in IDEA when rootProject.name != buildIdentifier.name
• KT-56700 V2 MPP Source Set layout warnings should include link to docs
• KT-55926 TCS: Gradle Sync: Import Extras on KotlinSourceSet and KotlinTarget
• KTIJ-24364 KotlinProjectArtifactDependencyResolver: Extend API to include information about ‘requesting source set’
• KTIJ-24365 KotlinMPPGradleProjectResolver: Create extension points for other plugins (Android)
• KT-55730 MPP / Gradle: compileKotlinMetadata fails to resolve symbols in additional source sets

Tools. Gradle. Native

• KT-58838 KGP/Multiplatform: 1.9.0-Beta with custom cinterops: IllegalStateException: Could not create domain object ‘jni’ (DefaultCInteropSettings)
• KT-57823 KotlinNativeCompileOptions.moduleName value is ignored and replaced with the default one if to set up using compilations
• KT-57815 KotlinNativeCompileOptions.moduleName isn't accessible if to configure using compilerOptions.configure {}
• KT-57944 K2: K2, MPP, Native: K2 reports “Source does not belong to any module” for native sources
• KT-53108 Expose Kotlin/Native compiler options as Gradle DSL
• KT-58063 Kotlin/Native tasks configuration cache are not compatible with Gradle 8.1
• KT-38317 Kotlin/Native: NSURLConnection HTTPS requests fail in iOS tests due to --standalone simctl flag
• KT-56280 Gradle: freeCompilerArgs are no longer propagated from compilations to Native binaries

Tools. Incremental Compile

• KT-58289 IC fails to detect a change to class annotations
• KT-58986 New IC: ISE “The following LookupSymbols are not yet converted to ProgramSymbols: LookupSymbol(name=$$delegatedProperties, ...)”
• KT-56197 If use classpathSnapshot, the invoke place of subclass's super function who has default parameters will not recompiled if it is incremental build
• KT-56886 K2: Changes to Java sources used in Kotlin project do not trigger a rebuild if a previous build was successful

Tools. JPS

• KTIJ-25384 JPS plugin: serialization plugin is not applied to modules
• KT-56438 Add minimal statistic report for JPS build
• KT-58314 kotlin-build-statistics is missing for kotlin-jps-plugin
• KT-55696 JPS IC K2 - fix new failing tests with Java interop
• KT-57102 SCE: DefaultErrorMessages$Extension: DefaultErrorMessagesWasm not a subtype after adding WASM error messages

Tools. Kapt

• KT-54468 KAPT Gradle plugin causes eager task creation
• KT-59521 Kapt maven plugin require version of annotation processor
• KT-58301 K2: Compile Kotlin task failure for the generated by Kapt sources : 'Source NameOfTheGenerated.kt does not belong to any module
• KT-57598 K2: Support a fallback mode executing Kapt with K1 even when the compiler is run with languageVersion=2.0
• KT-58226 KAPT: “org.jetbrains.kotlin.psi2ir.generators.ErrorExpressionException: null: KtNameReferenceExpression” with enum with secondary constructor

Tools. Maven

• KTIJ-25445 Maven. JVM target is imported as 1.6 when no target specified in pom.xml

Tools. Parcelize

• KT-59112 K2: “IllegalStateException: Function has no body with @Parcelize” on nested sealed class hierarchies

Tools. Scripts

• KT-58366 The obsolete kotlin-script-util jar is still published and contains broken JSR-223 implementation

Tools. Wasm

• KT-56585 Change wasmBrowserRun Browser Executable to System Default
• KT-56159 Running (karma) tests doesn't work in a project generated by wizard “Browser Application for Kotlin/Wasm”
• KT-57203 Update Kotlin/Wasm to support Gradle 8

Recent ChangeLogs:

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ChangeLog-1.5.X

ChangeLog-1.4.X

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ChangeLog-1.2.X

ChangeLog-1.1.X

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