ChangeLog.md

2.2.10

Compiler

KT-79276 Dexing fails with “Cannot read field X because is null” with 2.2.0
KT-79442 “Multiple annotations of type kotlin.coroutines.jvm.internal.DebugMetadata”: 2.2.0-Beta1 generates broken code with JVM default suspend methods in interfaces
KT-78815 Symbol not found: __ZNSt3__117bad_function_callD1Ev error on iOS 15.5 simulator in Xcode 16.3 after update to 2.2.0-Beta2
KT-78501 K2: Missing [ABSTRACT_SUPER_CALL] diagnostics for delegated interface method leads to AssertionError: isCompiledToJvmDefault during IR lowering
KT-78479 IR lowering failed / Unexpected null argument for composable call
KT-76477 Kotlin/Native: fix compiler performance reporting in sources->klib and klibs->binary
KT-78736 Missing [NOT_YET_SUPPORTED_IN_INLINE] diagnostics because of incorrect context update
KT-77685 “IllegalArgumentException: Sequence contains more than one matching element”
KT-76365 K2: Missing ABSTRACT_SUPER_CALL
KT-78352 False-positive IDENTITY_SENSITIVE_OPERATIONS_WITH_VALUE_TYPE when comparing with equality operator (==)

Compose compiler

KT-78479 Ensure that default transform affects functions entered through a call
KT-78490 Fix visibility for default wrappers of protected methods
b/408492167 Emit parameter names in Compose source information

JavaScript

KT-79050 KJS / IC: “Unexpected body of primary constructor for processing irClass”
KT-79089 KJS: Could not load reporter / Cannot find module ‘mocha’ when running jsNode tests

Native

KT-79075 Stuck on Kotlin_getSourceInfo_core_symbolication
KT-76178 LLVM Update: symbol ‘__ZnwmSt19__type_descriptor_t’ missing

Native. Runtime. Memory

KT-78925 Crash SIGABRT on Apple Watch after updating Kotlin to 2.2.0

Tools. CLI

KT-77445 UNRESOLVED_REFERENCE when importing classes from kotlin-stdlib
KT-78263 java.lang.NoClassDefFoundError: Could not initialize class com.intellij.psi.impl.PsiSubstitutorImpl
KT-78318 Unresolved reference when compiling kotlin/JS project on fresh master

Tools. Compiler Plugins

KT-78490 “AssertionError: SyntheticAccessorLowering should not attempt to modify other files” when calling protected open composable with default argument
KT-78038 Make jvm-abi-gen compiler plugin output classloader-friendly

Tools. Gradle

KT-77023 Support creating KotlinJvmAndroidCompilation in KotlinBaseApiPlugin

Tools. Gradle. JS

KT-78504 [2.2.0-RC3] NPM Tasks in 2.2 RCs produce broken/unusable build cache entries

Tools. Gradle. Multiplatform

KT-77466 KMP - testFixturesApi and similar configurations do not affect jvmTestFixtures source set
KT-68646 Compose extension's metrics/reports dir should use subdirs based on target

Tools. Gradle. Native

KT-77977 “Unknown hardware platform: riscv64” on JVM project build

Tools. Incremental Compile

KT-78807 Changing ABI fingerprint on non-ABI changes when lambda passed to inlined function

Tools. Kapt

KT-77853 K2 KAPT: backend internal error: exception during IR fake override builder
KT-79138 K2: KAPT Java Stub Gen: Unresolved reference with @kotlin.Metadata in Java in 2.2.0

2.2.0

Analysis API

KT-73337 Migrate analysis sources to new IR parameter API
KT-75880 K2 Mode: Typealias reference resolves to the underlying class in KMP project
KT-74246 KaVisibilityChecker.isVisible is inefficient with multiple calls on the same use-site
KT-57733 Analysis API: Use optimized ModuleWithDependenciesScopes in combined symbol providers
KT-69535 Redesign ‘containingSymbol’
KT-69950 Analysis API: Introduce isSubtypeOf(ClassId)
KT-68393 Analysis API: Rename KaClassLikeSymbol. classIdIfNonLocal to classId
KT-62924 Analysis API: rename KtCallableSymbol.callableIdIfNonLocal -> callableId

Analysis API. Code Compilation

KT-75502 K2: IDEA hangs when evaluating inside kotlin-stdlib modules in the Kotlin project
KT-73077 Evaluation of inline functions is broken inside Kotlin project and Amper module in Idea sources
KT-73936 K2: CyclicInlineDependencyException: Inline functions have a cyclic dependency in evaluator
KT-74582 InterpreterMethodNotFoundError when trying to evaluate simple expressions after recent fixes
KT-74524 Compilation exception with incorrect JvmName annotation arguments
KT-74443 Compilation peer collector ignores inline property accessors

Analysis API. FIR

New Features

KT-73493 Support context parameters

Performance Improvements

KT-75790 Experiment with increasing DEFAULT_LOCKING_INTERVAL time
KT-72159 LLFirCompilerRequiredAnnotationsTargetResolver: consider rewriting it to use honest jumping locks

Fixes

KT-76331 Cleanup FileStructureElement for classes
KT-73117 K2 AA: Exception “Setter is not found” when val has a setter without body
KT-76540 K2: Missing library dependency on Android SDK from androidx.activity-1.8.2 causes LiveEdit failures
KT-73266 K2. “Declaration should have non-local container” with unclosed annotation on top-level function
KT-76432 JavaClassUseSiteMemberScope: Expected FirResolvedTypeRef with ConeKotlinType but was FirUserTypeRefImpl
KT-76217 K2 AA: “No fir element was found for KtParameter” with multiple context parameter lists
KT-74740 Highlighting is broken after the built-in serialization refactoring
KT-76366 ContextCollector: annotations on class members don't have the class as implicit receiver
KT-76352 ContextCollector: wrong class annotation context in BODY mode
KT-76341 ContextCollector: support dangling modifiers
KT-76332 “Declaration should have non-local container” for declaration inside file annotation
KT-76115 Disable FirElementBuilder#getFirForElementInsideAnnotations optimization for files, classes and scripts
KT-76347 ContextCollector: avoid resolution for enum entry annotations
KT-76272 Cleanup AbstractFileStructureTest
KT-75542 K2 AA: “FirDeclaration was not found for class KtNamedFunction, fir is class FirErrorExpressionImpl” for unclosed annotation on member function
KT-73719 K2. “FirDeclaration was not found for class KtDestructuringDeclaration, fir is class FirBlockImpl” on incorrect chain call
KT-72908 K2 Analysis API: “FirDeclaration was not found for class org.jetbrains.kotlin.psi.KtFunctionLiteral” with non-local destructuring declaration without initializer before init block
KT-75532 ContextCollector: scope for an anonymous function type parameter contains regular parameters
KT-74508 FirElementBuilder#findElementInside should reuse logic from KtToFirMapping#getFir
KT-73066 [LL] Enable low-level-api-fir-native even with the disabled native part
KT-75132 Investigate failures of sandbox diagnostic test
KT-75130 Set up LL FIR tests for sandbox test data
KT-73386 Standardize LL FIR test for compiler test data
KT-75125 ISE “Value classes cannot have 0 fields” on instantiating inline class without fields
KT-75179 ContextCollector: support error properties
KT-74632 K2: ISE FirLazyDelegatedConstructorCall should be calculated before accessing
KT-74818 K2 AA: “FirDeclaration was not found for class KtTypeParameter, fir is null” with TYPE_PARAMETERS_NOT_ALLOWED on anonymous function
KT-73183 Support context parameters in ContextCollectorVisitor
KT-60350 K2 IDE: top level destructuring RHS should be resolvable
KT-74794 K2: FirLazyExpression should be calculated before accessing with context parameter and implicit return type
KT-72938 Get rid of KaFirAnnotationListForReceiverParameter
KT-73727 Exception in implicit type resolution

Analysis API. Infrastructure

KT-74917 [Analysis API, Test Framework] Introduce a way to acquire PsiFile for a given TestFile in KtTestModule

Analysis API. Light Classes

KT-73405 Get rid of KtElement#{symbolPointer, symbolPointerOfType} API usages
KT-75391 Reduce the amount of psi-based logic in light classes
KT-70001 SLC adds @Override with zero text offset on override member
KT-75755 K2. False positive red code on vararg parameters in Kotlin class with @JvmOverloads when called from Java
KT-75397 Constructors and functions with non-last vararg parameters are treated as varargs
KT-74868 Support context parameters
KT-74733 SymbolPsiLiteral.text == value for Java constant
KT-74620 Delegated functions with value classes are present in light classes
KT-74595 Static functions with value classes are present in light classes
KT-74284 Synthetic data class methods using value class types present in LC

Analysis API. Providers and Caches

Performance Improvements

KT-62115 Analysis API: Package providers are not cached per search scope
KT-74463 Analysis API: LLNativeForwardDeclarationsSymbolProvider queries its cache even when the ClassId cannot represent a native forward declaration

Fixes

KT-74541 Analysis API: Include files generated by resolve extensions in KaModule content scopes
KT-64236 Analysis API: Introduce a separate module for fallback dependencies of library source modules
KT-74090 Analysis API: Support dumb mode (restricted analysis)
KT-63780 Analysis API: Invalidate resolvable library sessions when binary library modules are modified
KT-72388 KaFirStopWorldCacheCleaner: Control-flow exceptions
KT-74943 Analysis API: Replace KotlinGlobalModificationService with simpler global modification event publishing and listener-based modification trackers
KT-70518 K2: Analysis API: Access indices outside of ConcurrentMap computation in symbol providers
KT-74302 Analysis API: LLFirProvider should disregard self-declarations in getFirClassifierBy*
KT-67868 Analysis API: Improve the architecture of LLFirKotlinSymbolProviders

Analysis API. Standalone

KT-72810 withMultiplatformLightClassSupport is inconvenient in Standalone

Analysis API. Stubs and Decompilation

KT-71787 PsiRawFirBuilder.Visitor#visitStringTemplateExpression forces AST loading
KT-68484 K2 IDE, Analysis API: “We should be able to find a symbol for function” for getting KaType of Iterable<T>.map(transform: (T) -> R) parameter in J2K

Analysis API. Surface

New Features

KT-74475 Add isInline for KaPropertySymbol
KT-75063 KaScopeContext: support context parameters

Performance Improvements

KT-73669 Support psi-based symbol pointer for implicit primary constructors
KT-76008 Provide PSI-based implementation for KaFirNamedClassSymbol#companionObject
KT-70165 Introduce PSI-based KaSymbols for K2

Fixes

KT-72730 K2: “Unexpected owner function: KtNamedFunction” on vararg val parameter in function
KT-75123 K2. KaFirNamedFunctionSymbol should contain a receiver
KT-75894 Cannot build KaFirJavaFieldSymbol for FirFieldImpl
KT-75115 Analysis API: The JavaModuleResolver compiler class is leaked to Analysis API platform implementations
KT-76018 K2: Stop the wold leads to deadlock/freeze
KT-76011 KaFirNamedClassSymbol#companionObject doesn't provide generated objects generated by compiled plugins
KT-72482 “KotlinIllegalArgumentExceptionWithAttachments: Expected all candidates to have same callableId but some of them but was different” on trying to add the import
KT-75586 KaFirPropertyGetterSymbol#isInline and KaFirPropertySetterSymbol#isInline is incorrect for accessors with explicit modifier
KT-58572 Analysis API: Enforcing STATUS resolve in ‘KtFirNamedClassOrObjectSymbol.visibility’ may cause lazy resolve contract violation
KT-75574 Recognize injected code fragment copies
KT-75573 Recognize physical file copies as dangling files
KT-74801 Analysis API: Publish/subscribe to modification events with a single message bus topic
KT-73290 Analysis API: Improve the architecture of content scopes and resolution scopes
KT-68901 Constructor delegation call receiver missing in fir implementation
KT-72639 Support context parameter API
KT-73112 AA: FirExpression.toKtReceiverValue should handle context receivers properly
KT-74905 Cannot find context receiver in FIR declaration
KT-74563 createPointer is overloaded not for all implementations
KT-73722 Analysis API: Automatically check that the API surface is fully documented
KT-65065 Provide KtTypeReference#getShortTypeText()

Backend. Native. Debug

KT-75991 Xcode 16.3: Fix lldb stepping test over an inline function

Backend. Wasm

New Features

KT-59032 Support instantiation of annotation classes on WASM

Fixes

KT-77622 K/Wasm: investigate CMP crash on mobile Safari
KT-76747 [Wasm] Wasm name section absent for wasm structs
KT-76701 K/Wasm: custom formatters are not loaded when a project is built with incremental compilation
KT-66081 K/WASM: 0/0, 5/0 and 5%0throw not ArithmeticException, but RuntimeError
KT-76287 [Wasm] Enable stdlib and kotlin.test tests after compiler bootstrap
KT-75871 [Wasm] Implement new RTTI approach
KT-75872 Wasm / IC: IllegalStateException: IC internal error: can not find library
KT-74441 K/Wasm: incorrect 1e-45.toString()
KT-59118 WASM: floating point toString inconsistencies
KT-68948 Wasm: float from variable is printed with many decimal points
KT-69107 [wasm] Seemingly incorrect rounding
KT-73362 Migrate K/Wasm sources to new IR parameter API

Compiler

New Features

KT-70722 Implement better Kotlin warnings for value classes and JEP 390 (Warnings for Value-Based Classes)
KT-71768 Enable -Xjvm-default=all-compatibility by default to generate JVM default interface methods
KT-54205 Support jakarta Nullability annotations
KT-57919 Store all annotations in Kotlin metadata on JVM under a flag
KT-73255 Change defaulting rule for annotations
KT-74382 Annotating Java record components for @JvmRecord data class
KT-74811 Prohibit usages of @MustUseValue / @IgnorableValue if RV checker is not enabled
KT-74806 Implement feature flag for improved unused return value checker
KT-74809 Support unnamed local variables
KT-73508 Add a warning diagnostic for using kotlin.concurrent.AtomicRef
KT-72941 ANNOTATIONS_ON_BLOCK_LEVEL_EXPRESSION_ON_THE_SAME_LINE missing in K2
KT-74497 Warn about incompatible Kotlin and Java targets in annotations
KT-75061 Support context-sensitive resolution in type position
KT-75315 Support context-sensitive resolution in the call-argument position
KT-75316 Support context-sensitive resolution for expression-position with expected type
KT-76088 Support context-sensitive resolution for annotation arguments
KT-74049 Introduce special override rule to allow overriding T! with T & Any

Performance Improvements

KT-76395 Performance degradation on 28.03.2025
KT-76422 FirJavaFacade#createFirJavaClass: do not compute super type references right away
KT-75957 K2: PsiRawFirBuilder.Visitor#toFirExpression forces AST loading via getSpreadElement
KT-74824 Exponential performance caused by nested flexible types
KT-62855 K2: extra allocation for SAM conversion compared to K1
KT-74977 K/N: support stack array for Array(size) call
KT-74369 Exponential compiler memory usage in specific situations with type inference

Fixes

KT-76606 Enable ‘Indy: Allow lambdas with annotations’ by default
KT-77301 False positive Context Parameter resolution when using DslMarker
KT-74389 K2: False positive NON_EXPORTABLE_TYPE on non-Unit Promise<...> in K/JS
KT-77219 “@Composable annotation is not applicable” on vararg @Composable () -> Unit in Kotlin 2.2.0
KT-76357 K2: a nested class annotation observes member declarations of the outer class
KT-72734 Support new callable reference nodes in Kotlin Native
KT-74421 K2: Missing “val cannot be reassigned” when trying to assign a value to parent's “val”
KT-63720 Coroutine debugger: do not optimise out local variables
KT-74470 NSME on calling in runtime internal constructor of value class with default arg from tests
KT-77640 Context parameters: using ‘contextOf()’ function leads to [NO_CONTEXT_ARGUMENT]
KT-73909 Add an inspection discouraging usage of kotlin.concurrent Native atomics in favor of the new atomics
KT-76583 CCE: suspend lambda attempts to unbox value class parameter twice after lambda suspended
KT-76663 KJS: KotlinNothingValueException caused by expression return since 2.1.20
KT-75457 Native: cache machinery uses stdlib cache with default runtime options even if custom runtime options are supplied when partial linkage is disabled
KT-76615 K2: “IllegalArgumentException: Inline class types should have the same representation: Lkotlin/UByte; != B” for mixed Java/Kotlin code
KT-77220 Annotation with EXPRESSION is not allowed on lambdas in Kotlin 2.2.0
KT-76381 K2: Expected expression ‘FirPropertyAccessExpressionImpl’ to be resolved
KT-74739 Native: “IllegalArgumentException: All constructors should've been lowered: FUNCTION_REFERENCE”
KT-74325 Explicit API mode does not enforce explicit return types for extension properties
KT-77259 Confusing message for ANNOTATION_WILL_BE_APPLIED_ALSO_TO_PROPERTY_OR_FIELD
KT-73771 K2: Infinite compilation caused by buildList without type
KT-61258 Kotlin/Native: CLASS CLASS name: modality:FINAL visibility:local superTypes:[.Base]
KT-75317 Kotlin/Native: segfault in kotlin::gc::Markkotlin::gc::mark::ConcurrentMark::MarkTraits
KT-75965 The iOS app did not run successfully in Release mode
KT-77397 Report UNSUPPORTED_CONTEXTUAL_DECLARATION_CALL when calling declaration with contextual function type in signature
KT-77137 K2: Controversial behavior allows resolving annotation arguments on a companion inside it
KT-77150 Native: compilation fails with an assertion error
KT-51960 ClassCastException: Inline function with both context and extension receiver produces this when invoked
KT-73611 Remove -Xextended-compiler-checks in favor of a deprecation cycle
KT-74649 Deprecate language versions 1.8 and 1.9
KT-77283 Binary compatibility of FirDeclarationChecker
KT-73445 K2: do not report “cannot infer visibility” when inheriting multiple implementations
KT-75945 Indy: Allow lambdas with annotations
KT-76898 K2: ClassCastException when data class shadows supertype's componentX method with wrong type
KT-75992 Xcode 16.3: stacktraces on simulators are not symbolicated
KT-76805 Wrong NPE occurs when assigning synthetic properties with platform types in Kotlin 2.1.20
KT-76171 “KotlinIllegalArgumentExceptionWithAttachments: Expected expression ‘FirSingleExpressionBlock’ to be resolved”
KT-77078 K2: anonymous object is wrongly allowed to implement interfaces by unsafe Delegation
KT-72722 Treat ‘copy’ calls of a data class as explicit constructor usages
KT-77001 Leave ForbidParenthesizedLhsInAssignments as a warning
KT-75828 Store backing field/delegate annotations and extension receiver annotations in metadata
KT-58369 K2: enable DFA warnings
KT-51258 Annotations should go before context receivers
KT-76253 K2 Compiler: Less precise diagnostic COMPONENT_FUNCTION_AMBIGUITY for flexible type
KT-59526 Store annotation default values in metadata on JVM
KT-63850 K2: setter with an annotated parameter has isNotDefault == false flag in metadata
KT-75712 -Wextra: false positive UNUSED_LAMBDA_EXPRESSION on functional type variable assignment with inferred type
KT-4779 Generate default methods for implementations in interfaces
KT-69624 Debugger: Missing local variable in Variables view (inline function)
KT-75518 NO_CONTEXT_ARGUMENT should report the name of the context parameter in addition to the type
KT-76199 Introduce -Xcontext-sensitive-resolution compiler flag
KT-75553 MISSING_DEPENDENCY_SUPERCLASS and MISSING_DEPENDENCY_SUPERCLASS_WARNING is reported at the same time on the same element
KT-76159 Obsolete error “‘@JvmDefaultWithCompatibility’ annotation is only allowed on interfaces” should be removed
KT-76660 False negative RETURN_NOT_ALLOWED in lambda in default argument leads to NoClassDefFoundError: $$$$$NON_LOCAL_RETURN$$$$$
KT-76301 Fail to infer types after syntactical change
KT-74999 K2: KotlinNothingValueException within Extension Function
KT-76675 KIAEWA exception at KaFirDataFlowProvider with non-local return from nested inline call
KT-75756 Backend Internal error: Exception during IR lowering when trying to access variable from providedProperties in class within kotlin custom script
KT-76345 Enhance variable fixation
KT-76578 [FIR, K1/K2 Regression] lateinit is allowed on loop parameters
KT-76448 FirOverrideChecker: class ClsMethodImpl is not a subtype of class KtNamedDeclaration for factory VIRTUAL_MEMBER_HIDDEN
KT-73360 Migrate K/JVM sources to new IR parameter API
KT-74852 Kotlin/Native: allow caches for thread state checker and sanitizers
KT-76130 IR evaluator does not support array literals in annotation parameter default values
KT-76436 Missing K2 checker: non-local return through lambda passed to inline f/o
KT-74326 False negative: no variable must be initialized error though code doesn't compile
KT-76572 FIR_NON_SUPPRESSIBLE_ERROR_NAMES does not contain deprecation errors
KT-75704 Refactor FirWhenSubjectExpression
KT-76284 Flexible captured type is not approximated in receiver position
KT-76192 RETURN_TYPE_MISMATCH with same expected and actual type: nullability of actual type is omitted
KT-75944 Allow using invokedynamic for lambdas with no ‘Runtime’ level retention annotations
KT-76396 FirIntegerConstantOperatorScope: NoSuchElementException: Collection contains no element matching the predicate
KT-76209 CONFLICTING_UPPER_BOUNDS on Nothing bound
KT-59506 Context receivers: Unable to use trailing comma in receiver list
KT-46119 NONE_APPLICABLE instead of NAMED_ARGUMENTS_NOT_ALLOWED with overloaded Java constructor call
KT-75503 Run lazy resolution in CallableCopyTypeCalculator and use withForcedTypeCalculator everywhere in checkers
KT-76485 Don't report EXTENSION_SHADOWED_BY_MEMBER if extension can be called with named arguments
KT-76154 False positive “EXTENSION_SHADOWED_BY_MEMBER” when extension adds default values to parameters
KT-76527 False positive UNSUPPORTED_CONTEXTUAL_DECLARATION_CALL with -Xcontext-receivers and implicit invoke
KT-63246 K2: False positive NOTHING_TO_OVERRIDE in generic property with context receiver in non generic class extending generic class
KT-58534 K2: “Argument type mismatch” with typealias to context receiver functional type
KT-71792 Switch latest stable version in Kotlin project to 2.2
KT-74827 CompilationErrorException : Could not load module in an attempt to find deserializer when trying to evaluate an expression
KT-70352 K2: False-negative CONFLICTING_UPPER_BOUNDS on Nothing bound
KT-71481 K2: drop pre-1.6 language features from compiler code
KT-74454 Support trailing comma in context parameters
KT-74069 False positive UNUSED_EXPRESSION due to Long/Int conversion
KT-74337 Local Delegated properties don‘t preserve their annotations and don’t show up in reflection
KT-55187 Context receivers in function types can have labels
KT-58498 Context receivers: ClassCastException with object and extension function in interface
KT-58165 K2: “IllegalArgumentException: No argument for parameter VALUE_PARAMETER” on overridden contextual property
KT-75234 Add error for callsInPlace contracts on context parameters
KT-73805 K2: Investigate missing diagnostic in implicit invoke call on context function type with receiver from module with disabled context parameters
KT-41934 NI: a type variable for lambda parameter has been inferred to nullable type instead of not null one
KT-75983 Backend Internal error: Exception during IR lowering ‘IllegalStateException: Internal error: cannot convert Any to Int’
KT-75535 Compilation of typealias does not check for clashes
KT-72313 K2 IDE / KMP Debugger: Evaluation of inline functions declared in a common source set causes a crash
KT-76290 False positive UNUSED_EXPRESSION while returning Unit in the when branches
KT-32358 NI: Smart cast doesn't work with inline function after elvis operator
KT-76316 K2: Missing NON_PUBLIC_CALL_FROM_PUBLIC_INLINE on object extending private class in public inline function
KT-76324 Frontend diagnostic says “... this will be an error in Kotlin N.M” but N.M is already released
KT-76058 PCLA: compile-time failure on calling a higher-order function from another module inside a lambda assigned to a variable of a type with a postponed type variable
KT-75571 K2: type mismatch error provides unsubstituted types
KT-31391 ‘Recursive call is not a tail call’ with elvis operator in tailrec function
KT-73420 False-positive NON_TAIL_RECURSIVE_CALL on tailrec function with elvis in the return statement
KT-75815 Disable warnings about different context parameter names in overrides
KT-75169 Unnecessary EXTENSION_SHADOWED_BY_MEMBER on generic declarations
KT-75483 Native: redundant unboxing generated with smart cast
KT-76339 K2: Dangling modifier list is missed for enum entries in PSI mode
KT-75513 Avoid overrides traversal without preinitialization
KT-74587 Report an error when JvmDefaultWithoutCompatibility is used with -Xjvm-default=all
KT-76257 Annotations with class references are not supported when marking IR declarations as visible to metadata
KT-71793 Drop language versions 1.6 and 1.7
KT-59272 Incorrect bytecode generated: wrong line number table after condition
KT-69248 K2: IAE “class KtDotQualifiedExpression is not a subtype of class KtCallExpression for factory ENUM_CLASS_CONSTRUCTOR_CALL” with qualified enum constructor call
KT-73778 Kotlin Debugger: NSFE on accessing private property from dependencies during evaluation
KT-74131 Incorrect line numbers for static initializer with delegated local variable
KT-76320 K2: PsiRawFirBuilder: import alias triggers ast loading
KT-63851 K2: No setterValueParameter in metadata for property setter with an annotated parameter
KT-55083 JVM: AbstractMethodError caused by lambda with sealed base interface and fun sub interface and overridden method
KT-16727 Names for anonymous classes in interfaces are malformed on JDK 8
KT-12466 NoClassDefFoundError: B$DefaultImpls on super interface call through K-J-K inheritance
KT-71002 Possible inheritance from nullable type through typealias
KT-75293 K2: Missing [HAS_NEXT_FUNCTION_TYPE_MISMATCH] diagnostics
KT-75498 Forbid .declarations access from checkers
KT-72335 KotlinIllegalArgumentExceptionWithAttachments when using illegal selector
KT-68375 K2: FirPrimaryConstructorSuperTypeChecker fails on generated superclasses
KT-71718 K2: drop TypePreservingVisibilityWrtHack
KT-75112 FE resolves wrong receivers order for property passed to delegate
KT-75924 K2. Incorrect generic type Inference “R? & Any” appears for “Add explicit type arguments”
KT-75969 java.lang.IllegalArgumentException: source must not be null on red code
KT-75322 ConeDiagnosticToFirDiagnosticKt: source must not be null
KT-73800 Wrong method executed on super call in -Xjvm-default=all/all-compatibility with an extraneous super-interface
KT-38029 Wrong method executed on super call in diamond hierarchy with covariant override
KT-75242 Any use-site target can be applied to a lambda and an expression
KT-73051 incorrect direction of subtyping violation in type mismatch error's message for A<X> </: A<Y> given a Tv <: Rv == C constraint from a lambda return position
KT-75090 Argument type mismatch: actual type is ‘SuspendFunction0’, but ‘SuspendFunction0’ was expected when anonymous function is passed to function expecting suspend function type
KT-74956 K2: No USAGE_IS_NOT_INLINABLE with compiling an inlined function call
KT-76049 K2: drop explicitTypeArgumentIfMadeFlexibleSynthetically creation when DontMakeExplicitJavaTypeArgumentsFlexible is enabled
KT-76055 K2: drop prepareCustomReturnTypeSubstitutorForFunctionCall logic when DontMakeExplicitJavaTypeArgumentsFlexible is enabled
KT-76057 K2: don't do reverse Java overridability checks when DontMakeExplicitJavaTypeArgumentsFlexible is enabled
KT-75197 K2: Missing [COMPARE_TO_TYPE_MISMATCH] diagnostics
KT-75639 Inline context function leads to ClassCastException
KT-75677 K2: change runtime behavior of KT-75649 case in 2.2
KT-75961 K2: PsiRawFirBuilder.Visitor#visitSimpleNameExpressionforces AST loading via getReferencedNameElement().node.text
KT-67869 Make inference for lambda working consistently inside and outside of the call
KT-74885 K2: IAE “source must not be null” in FirCyclicTypeBoundsChecker
KT-75578 K2: False negative [SUPER_CALL_WITH_DEFAULT_PARAMETERS] when calling the upper-class implementation of a method with the default value argument
KT-73954 Generate implementations in classes for inherited non-abstract methods in -Xjvm-default=all-compatibility
KT-75173 Context parameters: KotlinIllegalArgumentExceptionWithAttachments if you override function with value/extension parameter by fun with context
KT-75742 Native: "IllegalArgumentException: unknown pass name '' " when specifying an empty list of LLVM passes
KT-74819 K2: False-positive overload resolution ambiguity for flatMap inside PCLA
KT-75093 K2 IDE: “Unreachable code” highlighting range is confusing
KT-74572 Context parameters: contracts don't work with context parameters
KT-74765 Move K1 lazy IR implementation from ‘ir.tree’ to ‘psi2ir’
KT-71425 IR Inliner: investigate return type of an inlined block
KT-74764 Native: merge init nodes generated within the same LLVM module for the same klib
KT-75561 K/N: place InteropLowering after UpgradeCallableReferences phase
KT-73369 K/N: move interop lowering up the pipeline
KT-75517 K2: Refactor FirCallableSymbol.resolvedContextParameters to return symbols
KT-75821 K2: REPL resolution doesn't take into account the property type when processing its initializer
KT-75705 IllegalArgumentException when isInitialized is used with java field
KT-75334 Java target shouldn‘t be specified if Kotlin target isn’t specified
KT-75157 Missing PARAMETER_NAME_CHANGED_ON_OVERRIDE and DIFFERENT_NAMES_FOR_THE_SAME_PARAMETER_IN_SUPERTYPES for context parameters
KT-75160 Check usages of value parameters in checkers and adapt to context parameters
KT-75729 KtPsiFactory: no type-safe way to create triple-quoted KtStringTemplateExpression
KT-75040 Unify subject and subjectVariable in FirWhenExpression
KT-75323 FirSyntheticProperty: Unexpected status. Expected is FirResolvedDeclarationStatus, but was FirDeclarationStatusImpl
KT-75602 Introduce concept of shared library session in Fir sessions
KT-75509 PARAMETER_NAME_CHANGED_ON_OVERRIDE is reported randomly
KT-75124 IAE “class org.jetbrains.kotlin.psi.KtContextReceiver is not a subtype of class org.jetbrains.kotlin.psi.KtParameter for factory EXPOSED_PARAMETER_TYPE” on private context receiver
KT-73585 K2: ABSTRACT_SUPER_CALL is not reported
KT-75531 K2 REPL: local name doesn't shadow one from implicit receiver
KT-73359 Migrate frontend sources to new IR parameter API
KT-75380 K2: Modality is configured incorrectly for some FirDefaultPropertyAccessor
KT-75526 Regression in K2 scripting: local name doesn't shadow one from the implicit receiver
KT-59379 K2: Missing MIXING_NAMED_AND_POSITIONED_ARGUMENTS
KT-75106 K2: type parameters of anonymous functions are unresolved
KT-73387 Unexpected implicit type during enhancement
KT-72618 Cannot define operator inc/dec in class context
KT-74546 Serialize context parameters to metadata
KT-68768 K2: unsuccessful inference fork with jspecify annotations
KT-75345 Add a test for KT-42271
KT-75012 K2: Compiler crash on dynamic == null
KT-75195 IllegalStateException: No value for annotation parameter when @all meta-target is used with annotation with constructor
KT-75163 WRONG_ANNOTATION_TARGET_WITH_USE_SITE_TARGET for @all meta-target although there are applicable targets
KT-75198 @all meta-target should be forbidden for delegated properties
KT-74958 K2: UNEXPECTED_TRAILING_LAMBDA_ON_A_NEW_LINE isn't reported on accidental trailing closure
KT-74982 Improve UNSUPPORTED message handling
KT-75111 False negative “This declaration needs opt-in” for usage of enum entry with OptIn marker in another module
KT-74924 Infinite recursion in substitution of captured type with recursive supertype
KT-75289 NPE: getParent(...) must not be null
KT-75275 Inline class member inherited from interface is not mangled in ‘-Xjvm-default=all-compatibility’
KT-74340 FIR: folding binary expression chains for psi parser
KT-73831 Do not choose field target in annotation classes
KT-73494 Enable first-only-warn annotation defaulting mode
KT-75174 K2: incorrect influence of return type nullability on required receiver type in KJK hierarchy with property
KT-74920 Overriding T! with T & Any is not allowed to the extension property receiver type
KT-75150 False ambiguous context parameter reported because context is not chosen via generic parameter
KT-74965 CLI compiler doesn't report syntax errors for JS, Metadata backends if light-tree mode is disabled
KT-74303 K2 IDE / Kotlin Debugger: AE “Trying to inline an anonymous object which is not part of the public ABI” on evaluating private inline function with object inside
KT-75177 NoSuchMethodError on suspend default interface method fake override returning inline class in -Xjvm-default=all-compatibility
KT-74718 K/N: Move TestProcessor phase to the top of the pipeline
KT-75015 Context parameters: it is possible to declare anonymous function with modifiers but they don't have any effect
KT-75092 K2: Missing errors for modifiers on anonymous function in statement position
KT-75009 Context parameters: context is unresolved inside anonymous function if passed as an argument
KT-75017 Context parameters: "IllegalStateException: Cannot find variable a: R|kotlin/String| in local storage " when context from another local function is called
KT-75154 Context receiver deprecation warning should depend on langauge version, not on LATEST_STABLE
KT-74979 Context parameters: anonymous functions with a context aren't parsed in complex cases
KT-74673 K2: ClassCastException when passing suspending functional interface with generic
KT-74469 K2: False positive: “Argument type mismatch” during Java interop
KT-75105 K2: False negative NAME_IN_CONSTRAINT_IS_NOT_A_TYPE_PARAMETER for type constraint of anonymous function
KT-74929 False positive TYPE_PARAMETER_OF_PROPERTY_NOT_USED_IN_RECEIVER if it is used with T&Any
KT-74227 K2: “Cannot infer type for this parameter. Please specify it explicitly” caused by lambda in another lambda with a parameterized function type
KT-64558 K2 compiler does not report UNNECESSARY_SAFE_CALL, UNNECESSARY_NOT_NULL_ASSERTION, USELESS_ELVIS, while K2 IDEA does
KT-74728 K2: Java method overriding Kotlin method with receiver loses vararg modifier
KT-70789 CLI error “mixing legacy and modern plugin arguments is prohibited” on using -Xcompiler-plugin unless default scripting plugin is disabled
KT-72829 Forbid ‘entries’ name of enum entry, and deprioritize it in resolve
KT-75037 K2: IrGeneratedDeclarationsRegistrar.registerFunctionAsMetadataVisible doesn't handle extension receivers and context parameters
KT-73149 Annotations support for context parameters
KT-74798 Report error on local contextual properties
KT-74092 Context parameters: it is not possible to declare an anonymous function with a context
KT-52152 K2: Investigate suspicious code at SAM conversions
KT-75016 K2: BackendException when context var property is declared in interface
KT-74474 K2: Report more precise diagnostic when last expression of non-unit lambda is a statement
KT-74478 K2: False negative RETURN TYPE_MISMATCH if the last statement of a lambda is indexed assignment
KT-73685 K2 IDE / Kotlin Debugger: NSME “Method not found” on evaluating function with constant value in @JvmName
KT-74449 Report RETURN_TYPE_MISMATCH instead of ARGUMENT_TYPE_MISMATCH for return expressions in lambdas
KT-74918 FIR: account for K/Wasm diagnostics in generateNonSuppressibleErrorNamesFile
KT-74897 K2: Report UNSUPPORTED_FEATURE instead of TOPLEVEL_TYPEALIASES_ONLY for nested type aliases
KT-74963 K2: Fir2Ir: Avoid a situation when startOffset > endOffset in generated IrBranch
KT-74697 Overriding a method that's both deprecated and non-deprecated should not cause warnings
KT-74928 K2: “IllegalStateException: Cannot find cached type parameter by FIR symbol” in KJK hierarchy with extension property
KT-74630 K2: local class arguments in annotations on types and type parameters are not serialized
KT-74445 Commonize Native Function/Property reference lowerings
KT-74670 Warning message CONTEXT_CLASS_OR_CONSTRUCTOR isn't reported for context receiver on the constructor
KT-74617 Trivial SMAP optimization leads to missing debug info after inline
KT-74812 compile-time failure on a callable reference with an input type inferred to an inaccessible generic type
KT-66195 K2: Java method is not enhanced from overridden's context receivers
KT-74501 Context parameters: ABSTRACT_MEMBER_NOT_IMPLEMENTED if fun with context is implemented in Java in KJK hierarchy
KT-74385 Missing diagnostic on repeated suspend modifier in function type
KT-74749 Provide explanation IR before script compilation
KT-74751 K2: IllegalStateException: Can't apply receivers of FirPropertyAccessExpressionImpl to IrTypeOperatorCallImpl
KT-74729 NPE when suspend lambda has inline class parameter
KT-74336 Not supported: class org.jetbrains.kotlin.fir.types.ConeIntersectionType
KT-74203 K2: False negative NO_ELSE_IN_WHEN of a generic type with star projection <*> bounded by a sealed hierarchy
KT-48085 Kotlin/Native: LLD removes live code with --gc-sections when producing DLL
KT-69164 Native: use lld from bundled LLVM distribution when compiling on Windows for a MinGW target
KT-74081 Context parameters: implicit call resolves to extension when there is a context
KT-74682 Implement internal type exposure via parameter bounds deprecation postponement
KT-74556 K2: “IAE: class KtDestructuringDeclaration is not a subtype of class KtNamedDeclaration for factory REDECLARATION” with two non-local destructuring declarations
KT-73146 Context parameters CLI & diagnostics
KT-72104 Consider enabling check for unbound symbols in JVM before lowerings
KT-74568 Synthetic nested classes missing JVM attributes
KT-73703 [Native] Move KonanIrLinker to serialization.native module
KT-61175 K2: FirReceiverParameter does not extend FirDeclaration
KT-73961 ‘lateinit is unnecessary’ on transient properties should not be reported for serializable classes
KT-73858 Compose / iOS: NullPointerException on building
KT-62953 JVM IR: Use SimpleNamedCompilerPhase instead of NamedCompilerPhase
KT-72929 Consider caching typealiased constructor symbols created by TypeAliasConstructorsSubstitutingScope
KT-74459 K2: false positive MISSING_DEPENDENCY_CLASS for types inside default argument
KT-73705 [Native] Decouple native caches support from KonanIrLinker and KonanPartialModuleDeserializer
KT-74091 K2: @JvmOverloads-produced overloads have generated line number table
KT-69754 Drop -Xuse-k2 compiler flag
KT-73352 K2: false negative ARRAY_EQUALITY_OPERATOR_CAN_BE_REPLACED_WITH_EQUALS
KT-72962 Consider enabling ConsiderForkPointsWhenCheckingContradictions LF earlier
KT-73027 IllegalStateException: Annotation argument value cannot be null: since
KT-74242 Freeze on runCatching call in finally block inside SAM conversion
KT-29222 FIR: consider folding binary expression chains
KT-73760 Cannot implement two Java interfaces with @NotNull-annotated type argument and Kotlin's plain (nullable) type parameter
KT-58933 Applying suggested signature from WRONG_NULLABILITY_FOR_JAVA_OVERRIDE leads to red code
KT-70507 Should parentheses prevent from plus/set operator desugaring?
KT-67520 Change of behaviour of inline function with safe cast on value type
KT-67518 Value classes leak their carrier type implementation details via inlining
KT-72305 K2: Report error when using synthetic properties in case of mapped collections
KT-71226 K2 Evaluator: Code fragment compilation with unresolved classes does not fail with exception
KT-70233 Implement a deprecation error for FIELD-targeted annotations on annotation properties
KT-67517 Value class upcast to Any leaks carrier type interfaces
KT-72814 FIR: don't use function references in FirThisReference
KT-73153 K2: Standalone diagnostics on type arguments are not reported
KT-73011 K2: Allow overloads resolution for callable references based on expected type variable with constraints
KT-70139 Remove dependencies of debugger on K1 and old JVM backend
KT-69223 Drop parallel lowering mode in JVM backend
KT-7461 Forbid using projection modifiers inside top-level Array in annotation's value parameter
KT-53804 Restore old and incorrect logic of generating InnerClasses attributes for kotlin-stdlib
KT-52774 Resolve unqualified enum constants based on expected type

Compose compiler

New features

5f7e5d1 Enabled PausableComposition feature flag by default
e49ba7a Enabled OptimizeNonSkippingGroups feature flag by default

Fixes

b/420729503 Avoid copying @Deprecated annotations on Compose compiler stubs
b/417412949 Emit fake line number for skipToGroupEnd branch
b/412584977 Fix false positive for overriding open functions from older dependencies
b/409238521 Fix crash when searching for ComposableLambda::invoke function on JS
b/408752831 Fix early return with value from key groups
b/388505454 Treat context parameters the same way as extension receiver
b/408013789 Add missing return for the default function wrappers
b/405541364 Realize coalescable children in the body of key call
b/305035807 Add support for @Composable function references with K2
b/401484249 Generate a group around Array constructor call
b/400380396 Fix missing endMovableGroup call with early return in key function
b/397855145 Fix “Unknown file” error in target annotation inference
b/274898109 Fix off-by-one error when calculating changed arg count for lambdas
b/377499888 Allow restarting overridden functions in a final class
b/393400768 Use -1 for .changed call if nullable enum parameter is null
b/390151896 Fix default arguments with varargs in @Composable functions
b/388030459, b/377737816 Prevent usage of transitive captures in lambda memoization
b/310004740 Check vararg parameter length in skipping logic
b/367066334 Add diagnostic to restrict @Composable annotation to function types only
b/388505454 Change order of $changed bits with context parameters
CMP-7873 Native build fails with “e: Compilation failed: Exception during generating code for following declaration”

IDE

KT-54804 Generate synthetic functions for annotations on properties in light classes

IR. Actualizer

KT-70907 Actualize fake override symbols in Ir Actualizer

IR. Inlining

Fixes

KT-76145 Enhance error message about poisoned KLIBs in KLIB-based compilers
KT-70916 IR: Report errors on exposure of private types in non-private inline functions
KT-73155 Move Mapping from LoweringContext back to CommonBackendContext
KT-76186 [IR] Sanitize deserialized IR dump of anonymous classes
KT-75788 IR inliner: Serialize preprocessed inline functions in a separate place inside KLIBs
KT-71416 Perform IR-level visibility diagnostics for inline functions after the first phase of inlining
KT-76224 [IR][Inliner] Dumb file is unsuported in IrSymbolBase.getDescriptor()
KT-75793 IR inliner: Stop injecting the deserialized function body to LazyIR inline function
KT-75791 IR inliner: NonLinkingIrInlineFunctionDeserializer should load inline functions from a separate location in a KLIB
KT-73708 Use some marker in KLIBs produced with IR inliner
KT-76024 [JS][IR Inliner] Partial linkage: No function found for symbol in kotlin package
KT-75733 Reorganize execution of the common prefix at 1st phase of compilation
KT-75986 Add an option to the DumpIrTreeOptions to dump IR signature if available
KT-75951 [IR Inliner] Illegal non-local return reported by the partial linkage engine
KT-75932 Fix a problem with already bound symbol with public IR inline enabled
KT-64812 Investigate and fix remaining owner usages in inliner
KT-74732 IR: Exposure of private type is reported at wrong source location
KT-76007 IR deserialization tests w/ enabled IR inliner: undefined offsets in IrInlinedFunctionBlock.inlinedFunctionSymbol
KT-74734 [Native] Use NativeInliningFacade in new subclass of AbstractFirNativeSerializationTest
KT-73985 KLIB Synthetic Accessors Dump Format: Include local declarations
KT-72594 [JS][Native] Add IrInliningFacade to test runners
KT-74456 SerializedIrDumpHandler: Compare IR dumps with source offsets
KT-73624 [Native] Implement inlining facade
KT-70370 SyntheticAccessorLowering: Turn on mode with narrowing visibility on 1st phase of compilation
KT-70452 OuterThisInInlineFunctionsSpecialAccessorLowering - run it after inlining of private functions
KT-70451 Enable double-inlining in Native & JS backends unconditionally
KT-69681 IR: Report warnings on exposure of private types in non-private inline functions

IR. Interpreter

KT-74581 Support IrRich*Reference in IR interpreter

IR. Tree

Fixes

KT-73189 Migrate compiler sources to new IR parameter API
KT-77508 K/JS and K/Native CompilationException Wrong number of parameters in wrapper
KT-74331 Implement IrElement.copyAttributes as a true attribute map copy
KT-76600 Use a language feature to check error on cross-file IrGetField operations generated by compiler plugins
KT-75628 IR validator: Forbid IrExpressionBody for IrFunction
KT-75679 Extract common invokeFunction in IrRichCallableReference
KT-74799 [Native][IR] Excessive FUNCTION_INTERFACE_CLASS after deserialization
KT-71138 Report error on cross-file IrGetField operations generated by compiler plugins
KT-75196 [IR] Make startOffset and endOffset mutable
KT-73206 Extract common parts from new IrRichFunctionReference/IrRichPropertyReference nodes
KT-73190 Migrate common backend sources to new IR parameter API
KT-73225 Migrate compiler.ir.serialization.common to new IR parameter API
KT-73220 Migrate compiler.ir.tree to new IR parameter API
KT-75189 Add an IR validation for the correspondingPropertySymbol
KT-74275 Adjust IR dump format for context parameters & new parameter API
KT-74269 Drop IrElementVisitor, IrElementVisitorVoid and IrElementTransformer interfaces
KT-72739 Create a lowering to replace old callable reference nodes with new ones
KT-73120 Get rid of Ir class
KT-73045 Fix inconsistency between shapes of IR calls vs callee
KT-69714 [IR] Remove IrErrorDeclaration
KT-73609 Tests: Implement DeserializerFacade for Kotlin/Native
KT-73813 Implement tests for all IR validator checkers
KT-73171 Choose the approach for testing IR serialization/deserialization wrt IR inliner
KT-73430 [IR] Get rid of SymbolFinder usages outside of Symbols hierarchy
KT-74455 IR dump: Support dumping source offsets
KT-73433 [IR] Get rid of some symbols lookup methods

JVM. Reflection

KT-75505 Reflection: use kotlin-metadata-jvm to implement class visibility, modality, modifiers, etc
KT-77663 Reflection: java.util.ServiceConfigurationError: “module kotlin.reflect does not declare uses” when using kotlin-reflect in modular mode
KT-75464 Bundle kotlin-metadata-jvm into kotlin-reflect
KT-71832 kotlin.jvm.internal.ClassReference static overhead is 11,060 bytes

JavaScript

New Features

KT-31493 [Kotlin/JS] Can't put typealias in file marked with JsModule annotation

Performance Improvements

KT-74533 K/JS: avoid number to char calls in charSequenceGet intrinsic

Fixes

KT-77021 CompilationException: Encountered a local class not previously collected on inner classes inside anonymous objects
KT-78073 K/JS: KProperty from local delegate changes after another delegate is invoked
KT-77271 KJS / Serialization: “Cannot set property message of Error which has only a getter”
KT-76235 [JS] Extra invalid line tmp_0.tmp00__1 = Options; in testSuspendFunction()
KT-76234 [JS] Extra invalid line Parent in testNested()
KT-76233 [JS] Extra invalid import line in testJsQualifier()
KT-74839 AssociatedObjectKey metadata doesn't survive incremental compilation
KT-77418 KJS: cannot debug with whole-program granularity
KT-76463 KJS: @JsPlainObject fails in parent count is 8+
KT-75606 KJS: java.lang.AssertionError: Different declarations with the same signatures were detected
KT-69591 KJS / d.ts: Wrong type of SerializerFactory for abstract classes
KT-72437 KJS. Invalid copy method for inherited JSO with type parameters
KT-57192 KJS: “Exported declaration uses non-exportable return type” caused by @JsExport Promise with Unit type
KT-73226 Migrate K/JS to new IR parameter API
KT-75254 KJS: Merge AbstractSuspendFunctionsLowering from Common and JS backends
KT-76440 @JsPlainObject compiles broken code when inlining suspend function and non suspend function
KT-71169 @JsPlainObject copy produces the wrong type when copied property is nullable in parent interface
KT-75772 KJS: NullPointerException caused by reference of private class with @JsExport
KT-73363 Migrate js-plain-objects plugin to new IR parameter API
KT-64927 [JS] TypeError when abstract class with override var property extends an exported abstract class with val property
KT-70623 Kotlin/JS: Incremental compilation fails when granularity is changed
KT-74384 Support new callable reference nodes in JS backend
KT-70652 Kotlin/JS: @JsExport doesn't work with granularity per-file
KT-71365 KJS. File-level export support
KT-68775 Kotlin/JS infinite loop for exception message override that calls super.message
KT-42271 K/JS: isInitialized for not-lateinit property isn't marked as error as in JVM project
KT-70664 Extending a @JsPlainObject interface with a generic type parameter fails with a compile error
KT-71656 K2 JS: “IllegalStateException: Class has no primary constructor: kotlin.ULong”
KT-42305 KJS / IR: “Class constructor is marked as private” @JsExport produces wrong TS code for sealed classes
KT-52563 KJS / IR: Invalid TypeScript generated for class extending base class with private constructor

Klibs

New Features

KT-72296 Use specialized signatures for serialized local fake overrides

Fixes

KT-78168 K/N: “IndexOutOfBoundsException: Index 3 out of bounds for length 3” for iOS build with Kotlin 2.2.0-RC2
KT-74635 KLIBs: Change call serialization scheme to store all arguments in a single list
KT-76061 Add option for suppress warning of missing no-existent transitive klib dependencies
KT-70146 [KLIB Resolve] Don't fail on nonexistent transitive dependency
KT-75624 Don't fail on an attempt to deserialize “unknown” IrStatementOrigin and IrDeclarationOrigin
KT-55808 Support metadata version checks for klibs in the compiler
KT-56062 Support -Xmetadata-version for KLIB-based compilers
KT-76158 Drop “description” from local signatures
KT-75749 KLIB: Fail with error on attempt to serialize/deserialize SpecialFakeOverrideSignature
KT-75941 [IR Inliner] Abstract function is not implemented in non-abstract anonymous object
KT-75867 The CLI argument -Xabi-version allows versions with multiple 0 and -0
KT-75192 KLIB reader tends to extract files from the KLIB archive to a temporary directory even when this is not needed
KT-75013 Make klib reader more flexible: allow empty directories to be omitted
KT-75680 KLIB: Drop obsolete IrPerFileLibraryImpl & IrPerFileWriterImpl
KT-73779 [Native] Context parameters: extension receiver is preferred over context parameters
KT-65375 Clean-up the logic for serialization of error types in metadata and in IR
KT-73826 Deduplicate IrFileEntry that is serialized inside IrInlinedFunctionBlock
KT-75091 Drop targets/$target_name/kotlin directory from klibs
KT-74352 API4ABI: Fix representation of context parameters
KT-71007 Align KLIB ABI version with the language version
KT-73672 Bump KLIB ABI version in 2.2.0
KT-74080 API4ABI: Adapt API for value parameter kinds
KT-74396 Support context parameters in klibs
KT-72931 Support new callable reference nodes in KLIB [de]serializer

Language Design

New Features

KT-2425 Multidollar interpolation: improve handling of $ in string literals
KT-1436 Support non-local break and continue
KT-13626 Guard conditions in when-with-subject
KT-54206 Support local contextual functions

Fixes

KT-53673 Support @DslMarker annotations on contextual receivers
KT-73557 Allow refining expect declarations for platform groups
KT-72417 Annotation with target RECORD_COMPONENT cannot be used on @JvmRecord data class components
KT-67977 Compile results of annotations assigned to JvmRecord properties as in Java
KT-73502 Context parameters: it is not possible to declare local function with a context
KT-73632 Expect class redeclaration is allowed
KT-70002 [LC] Forbid using projection modifiers inside top-level Array in annotation's value parameter

Libraries

New Features

KT-76163 K/N: Hide or remove CreateNSStringFromKString/CreateKStringFromNSString
KT-70456 Base64: Support lineLength parameter for Mime
KT-76394 kotlin.time.TimeSource.asClock missing
KT-31857 Provide easy way to retrieve annotations for kotlinx-metadata
KT-76528 Instant.parseOrNull
KT-74804 Add @MustUseValue and @IgnorableValue / @Discardable to kotlin-stdlib
KT-74422 KotlinWebsiteSampleRewriter should filter individual imports from samples package

Performance Improvements

KT-68860 K/JS: optimize listOf(element)
KT-75647 Optimized sequenceOf(T) overload is missing

Fixes

KT-72138 Stabilize experimental API for 2.2
KT-76831 Atomic types: inconsistent behavior on JS and Wasm targets
KT-76795 RecursiveDeletionTest.deleteRelativeSymbolicLink fails on Windows for unprivileged users
KT-75290 kotlin-metadata: deprecate hasAnnotations flag, add JVM-only hasAnnotationsInBytecode instead
KT-76193 Common Atomics: ‘AtomicArray.compareAndSetAt’ and ‘compareAndExchangeAt’ docs incorrectly suggest they use == when actually they use ===
KT-54077 Consider using SecureDirectoryStream in deleteRecursively even when Path.parent is null
KT-72866 Standard library functions to work with context parameters
KT-76743 Add kotlin-scripting-jvm to projectsUsedInIntelliJKotlinPlugin list
KT-72483 Clean up redundant stdlib code for Kotlin 2.2
KT-76385 Remove suppression from functions to work with context parameters
KT-75337 Remove suppress annotations from @IgnorableReturnValue
KT-72137 Review deprecations in stdlib for 2.2
KT-75491 Non intuitive work of ‘in’ (contains) with String range
KT-75933 Update readLine's KDoc to suggest alternative functions
KT-46360 Type inference fails to infer type for sumOf call with integer literal: “Overload resolution ambiguity TypeVariable(T)) -> Int / Long”
KT-73590 Samplify string.split
KT-75759 Add the serializer for kotlin.time.Instant to the list of standard serializers
KT-71628 Review deprecations in stdlib for 2.1
KT-73726 A link from shuffle's KDoc is not rendered properly
KT-74173 The sample code of lazy on stdlib can not run on playground due to “samples” package import
KT-50081 AbstractList sublist leads to StackOverflow

Native

KT-76992 Native: update llvm for windows targets
KT-56107 Support Enum.entries for C/ObjC interop enums
KT-76552 LLVM Update: rebase the LLVM branch
KT-76662 LLVM 19 update: documentation
KT-76560 LLVM Update: investigate changes in filterStdargH test
KT-76283 LLVM Update: pass all tests
KT-74377 Kotlin Native: release executable crashes with error 139
KT-75829 LLVM Update: port K/N on LLVM 19
KT-76280 LLVM Update: benchmarksAnalyzer build failed
KT-70202 Xcode 16 Linker fails with SIGBUS

Native. Build Infrastructure

KT-77349 Kotlin/Native: default cache for stdlib is unused

Native. C and ObjC Import

KT-75598 Native: fix samples/objc test
KT-76551 LLVM Update: investigate CXFile equality problem further
KT-75781 Xcode 16.3: Fix cinterop tests failing with fatal error: could not build module ‘_stdint’
KT-74549 Native: replace clang_Type_getNumProtocols/clang_Type_getProtocol with standard libclang functions

Native. Platforms

KT-74702 Deprecate Windows 7 support

Native. Runtime

KT-71534 Native: Support Latin-1 encoded strings at runtime
KT-67741 Kotlin/Native: Unify SpecialRef handling

Native. Runtime. Memory

KT-74831 Kotlin/Native: investigate mmap usage in custom allocator
KT-74432 Native: add an option to allocate everything in SingleObjectPage
KT-74975 Enable CMS by default in Swift export
KT-60928 Kotlin/Native: refactor allocator code
KT-50291 Kotlin/Native: remove dependency of mm on gc implementation

Native. Swift Export

KT-75166 Support export of platform libraries types in Swift export
KT-75079 Swift export: add dependency from sir-compiler-bridge to Analysis API
KT-72413 Swift Export: potential memory leak when best-fitting class is different from the formal type
KT-72107 Remove IntoSingleModule stratagy

Tools. Ant

KT-73116 Deprecate Ant support

Tools. BCV

KT-75686 Improve DSL for BCV in KGP
KT-76129 Abi validation filtering functionality for included classes doesn't work
KT-75999 ABI validation filter doesn't apply excluded kotlin files
KT-75981 ABI validation filter not applying excluded classes without package names
KT-71168 Implement a prototype of ABI Validation in Kotlin Gradle Plugin

Tools. Build Tools API

KT-76455 BTA: Compilation is always non-incremental if BTA API >= 2.2.0 is used together with BTA impl < 2.2.0
KT-76060 BTA: Java sources passed for IC may fail compilation in non-incremental mode
KT-74041 Build Tools API: Lower level or remove compiler arguments log

Tools. CLI

New Features

KT-73606 Provide a unified interface for managing the reporting of compiler warnings
KT-24746 Provide ability to exclude specific warnings from compiler option Werror (all warnings as errors)
KT-18783 Option to treat a specific compiler warning as an error
KT-76095 Add JVM target bytecode version 24
KT-73007 Add stable compiler argument -jvm-default instead of -Xjvm-default

Performance Improvements

KT-75641 kotlinc -help spends almost 1 second on Usage.render()

Fixes

KT-77445 UNRESOLVED_REFERENCE when importing classes from kotlin-stdlib
KT-75300 Lenient compiler mode which generates stubs for missing actuals
KT-76829 UnsupportedOperationException when reenabling a taking place warning with -Xwarning-level
KT-75588 [2.1.20-RC] “was compiled by a pre-release version of Kotlin and cannot be loaded by this version of the compiler” warnings despite using the same compiler version
KT-74663 kotlinc-js CLI: not providing -ir-output-dir results in NullPointerException
KT-75967 Implement generation of CLI arguments in compiler using new single representation
KT-75966 Declare all existing CLI arguments using the new DSL
KT-76498 Implement JSON dumper for performance stats
KT-75970 Extract all non-trivial logic from CommonCompilerArguments and its inheritors
KT-73595 Kapt.use.k2=true is ignored silently for language-version 1.9 or less
KT-75043 Migrate Metadata compilation pipeline to the phased structure
KT-75113 TEST_ONLY LanguageFeature doesn't abort the compilation

Tools. CLI. Native

KT-69485 Native: remove adding $llvmDir\bin to PATH on Windows

Tools. Commonizer

KT-74623 Drop metadata version check from KLIB commonizer

Tools. Compiler Plugin API

KT-74640 [FIR] Support setting source in declaration generators

Tools. Compiler Plugins

Fixes

KT-76162 “IllegalStateException: No mapping for symbol: VALUE_PARAMETER INSTANCE_RECEIVER” after updating to 2.1.20
KT-61584 [atomicfu]: prohibit declaration of AtomicReference to the value class in the compiler plugin
KT-70982 Deprecate declaration of atomic properties marked with @PublishedApi with error
KT-73367 Migrate compose plugin to new IR parameter API
KT-76429 Migrate kotlin-dataframe plugin to new IR parameter API
KT-75263 PowerAssert: no additional info is displayed for ‘when’ with subject
KT-75614 PowerAssert: handling of exceptions doesn't work inside assert function
KT-75264 PowerAssert: the diagram for try-catch with boolean expressions isn't clear
KT-75663 PowerAssert: ‘contains’ result for strings is displayed under the first parameter instead of ‘in’
KT-73897 PowerAssert: Implicit argument detection is brittle in a number of cases
KT-74315 Kotlin Lombok: “Unresolved reference” on generating @Builder for static inner class where outer class is also using @Builder
KT-72172 File Leak occurring in Kotlin Daemon
KT-75159 Compose: Missing ‘FunctionKeyMeta’ annotation on lamdas declared in non-composable function
KT-72877 Power-Assert should provide IrExpression transformation API
KT-73871 PowerAssert: Comparison via operator overload results in confusing diagram
KT-73898 PowerAssert: Operator calls with multiple receivers incorrectly aligned
KT-73870 PowerAssert: Object should not be displayed

Tools. Compiler plugins. Serialization

KT-49632 Provide diagnostic when custom serializer for generic type does not have required constructor signature ( ISE Null argument in ExpressionCodegen for parameter VALUE_PARAMETER)

Tools. Gradle

New Features

KT-75823 Resources bundle with XCFrameworks for iOS
KT-73418 Gradle ‘--warning-mode’ value should affect Gradle plugin diagnostics
KT-73906 Improve ToolingDiagnostic CLI rendering
KT-73285 Integrate Gradle Problem API with KGP diagnostics
KT-61649 Add Gradle compiler option for jvm-default
KT-68659 Collect reported Kotlin Gradle Plugin diagnostics into one HTML/Text file report instead of writing it to log

Fixes

KT-75188 Groovy plugin breaks access to internal members of test friendPaths classes in kotlin compilation
KT-54110 Change deprecation level to ERROR for kotlinOptions DSL
KT-74277 KGP / FreeBSD: “TargetSupportException: Unknown operating system: FreeBSD” during the build
KT-75820 Gradle: “ClassNotFoundException: intellij.util.containers.Stack” while parsing compilation warnings with IN_PROCESS execution strategy
KT-64991 Change deprecation level to error for KotlinCompilation.source
KT-75107 Add Gradle property to use new FIR IC runner
KT-66133 Finalize resolution strategy for resources and remove the one that is unused
KT-59632 KotlinCompileTool.setSource() should replace existing sources
KT-62963 Remove “kotlin.incremental.useClasspathSnapshot” property
KT-76137 Compatibility with Gradle 8.14 release
KT-76797 KGP: StdlibDependencyManagementKt.configureStdlibVersionAlignment() triggering eager configuration realization
KT-76282 Add missing Android Gradle plugin versions in tests
KT-77011 Update build regression benchmarks for 2.2.0 release
KT-76138 Compile against Gradle API 8.14
KT-76139 Run integration tests against Gradle 8.14
KT-74007 Not all the DSL features related to kotlinOptions are deprecated
KT-77288 Using ‘KotlinJvmOptions’ is an error - Gradle sync issue when using 2.2.0-Beta2 with Android Gradle Plugin
KT-74887 Compatibility with Gradle 8.13 release
KT-73682 Compatibility with Gradle 8.12 release
KT-77035 A compiler diagnostic isn't reported when its severity is set to warning with Gradle
KT-70620 Raise to error deprecation for KotlinCompilationOutput#resourcesDirProvider
KT-68597 Update KGP deprecations before 2.2
KT-68325 Add to Compiler Types DSL exceptions message possible ways of a solution
KT-76951 ‘distribution-base’ plugin is only applied in Gradle 8.13
KT-73142 Kotlin Gradle plugin: Remove usage of Gradle's internal ExecHandleBuilder
KT-73968 KotlinDependencyManagement tries to mutate configuration after it was resolved
KT-74890 Run Gradle integrations test against Gradle 8.13 release
KT-74889 Compile against Gradle 8.13 API
KT-76052 Support Gradle 8.13 for Problems API
KT-73684 Run integration tests against Gradle 8.12
KT-76377 Add integration tests for Problems API
KT-74551 Improve KGP-IT withDebug for tests with environment variables
KT-74717 Test publication with dependency constraints
KT-75164 Run Gradle incremental compilation tests with FIR runner
KT-72694 Accessing Task.project during execution is being deprecated in Gradle 8.12
KT-76374 Investigate and fix failing tests with configuration cache in KotlinDaemonIT: testDaemonMultiproject and testMultipleCompilations
KT-76379 Gradle: KotlinGradleFinishBuildHandler does not perform cleanup on configuration cache reuse
KT-61911 Gradle: make KGP to depend on fixated version of stdlib
KT-76026 [ToolingDiagnostic] Gradle warning mode=fail: no emoji replacement, title color unchanged
KT-76025 ToolingDiagnostic with FATAL Severity: ANSI escape codes are not rendered properly in the Build tool window in IntelliJ IDEA
KT-70252 Gradle: remove Intellij dependencies from KGP runtime
KT-74333 improve ToolingDiagnosticBuilder
KT-73683 Compile against Gradle API 8.12
KT-75187 Make KotlinToolingDiagnostics internal
KT-75568 Do not use env variables registered as CC inputs
KT-73842 Gradle: AGP failing tests with “Failed to calculate the value of property ‘generalConfigurationMetrics’” using KGP
KT-75262 Gradle test-fixtures plugin apply order breaks the project
KT-75277 FUS statistics: ‘java.lang.IllegalStateException: The value for this property cannot be changed any further’ exception is thrown during project import
KT-75026 Corrupted NonSynchronizedMetricsContainer in parallel Gradle build
KT-73849 Categorize ToolingDiagnostics
KT-74462 Flaky Kotlin Gradle Plugin Tests: IsInIdeaEnvironmentValueSource$Inject not found
KT-72329 Consider bumping apiVersion for projects with compatibility setup
KT-74772 ToolingDiagnostic: title is not displayed on Windows
KT-74485 BuildFinishedListenerService is not thread-safe
KT-74639 Executable binaries for JVM test cannot be created unless an additional suffix is set in Groovy
KT-72187 Gradle tests are using incorrect Kotlin/Native distribution
KT-57653 Explicit API mode is not enabled when free compiler arguments are specified in Gradle project
KT-51378 Gradle ‘buildSrc’ compilation fails when newer version of Kotlin plugin is added to the build script classpath

Tools. Gradle. Compiler plugins

KT-58009 BaseKapt.annotationProcessorOptionProviders should be a List<CommandLineArgumentProvider> instead of List<Any>
KT-61928 Clarify parameter types in KaptArguments and KaptJavacOption

Tools. Gradle. JS

KT-74859 Gradle configuration cache issues related to RootPackageJsonTask
KT-70357 Remove JS/Dce deprecated Gradle DSL
KT-71217 KJS: ‘Per-file’ “Module not found: Error: Can't resolve void.mjs”
KT-77119 KJS: Gradle: Setting custom environment variables in KotlinJsTest tasks no longer works
KT-74735 KGP uses Gradle internal CompositeProjectComponentArtifactMetadata
KT-71879 Notice of upcoming deprecation for Boolean ‘is-’ properties in Gradle Groovy scripts
KT-75863 Wasm/JS: Deprecate phantom-js for Karma
KT-75485 KJS: “Module not found: Error: Can't resolve ‘style-loader’ and ‘css-loader’” in 2.1.20-RC
KT-74869 KJS: jsBrowserProductionWebpack does not minify output with 2.1.20-Beta2

Tools. Gradle. Multiplatform

New Features

KT-60623 Deprecate publishAllLibraryVariants in kotlin-android

Fixes

KT-75161 Deprecate commonization parameters in KGP with an error
KT-74005 Implement a prototype of Unified Klib support in Kotlin Gradle Plugin
KT-61817 Remove support for Legacy Metadata Compilation with support of Compatibility Metadata Variant
KT-71634 KGP: Remove KotlinTarget.useDisambiguationClassifierAsSourceSetNamePrefix and overrideDisambiguationClassifierOnIdeImport
KT-77404 The kotlin-stdlib and annotations are missing from commonTest dependencies with 2.2.0-Beta1
KT-62643 Increase DeprecationLevel to ‘Error’ on deprecated ‘ExtrasProperty.kt’ (Kotlin 2.2)
KT-75605 Dependency resolution fails in commonTest/nativeTest source sets for KMP module when depending on another project due to missing PSM
KT-71698 Remove preset APIs
KT-68015 Remove legacy KMP flags
KT-74727 Dependency resolve from a single target KMP module to another kmp module fails on non-found PSM
KT-75808 KGP: MPP with jvm target and Gradle java-test-fixtures is broken
KT-59315 Improve the readability of KGP diagnostics in CLI build output
KT-58231 Kotlin Gradle Plugin: set deprecation level to Error for KotlinTarget.useDisambiguationClassifierAsSourceSetNamePrefix and overrideDisambiguationClassifierOnIdeImport
KT-66423 Configuration cache false recalculation because of Kotlin Native downloading during the execution phase
KT-74888 Use ‘distribution-base’ plugin in KMP/JVM
KT-76659 Write proper diagnostics for Uklib checks
KT-70493 Improve gray-box testing experience in KGP-IT
KT-71608 Remove ‘android()’ target
KT-75512 Maven-publish: ArtifactId is not correct inpom file with customized withXml
KT-72203 Swift Export: Unclear failure for invalid module name
KT-74278 KSP tasks don't trigger a K/N distribution downloading
KT-74669 Executable binaries for JVM: a jar generated by jvmJar task isn't added to the build/install/testAppName/lib directory
KT-69200 Module ‘intellij.kotlin.gradle.multiplatformTests’ transitively depends on K1/K2 implementation
KT-71454 Remove not compatible with Project Isolation PomDependenciesRewriter
KT-73536 Enable kmp isolated projects support for kotlin-test and patch PSM.json

Tools. Gradle. Native

KT-77067 Kotlin Gradle plugin with the configuration cache passes all platform libraries to the compiler when compiling a binary for the first time
KT-74953 Deprecate kotlinArtifacts with a warning
KT-71069 Remove konanVersion from CInteropProcess
KT-75171 Provide custom freeCompilerArgs to Swift Export's link task
KT-74591 HostManager.isMingw isLinux and isMac are not accessible in groovy scripts
KT-65692 Remove Kotlin Native Performance plugin
KT-74403 :commonizeNativeDistribution fails when configured native targets cannot be built on machine

Tools. Gradle. Xcode

KT-66262 Deprecate and remove support for bitcode embedding from the Kotlin Gradle plugin

Tools. Incremental Compile

KT-62555 Wrong ABI fingerprint for inline function containing a lambda
KT-75883 Follow-up: switch from INSTANCE heuristic to outerClass chain
KT-75276 Test IC issues with first-round failures that might be fixed by Fir runner
KT-76041 Make lenient mode work with IC
KT-75155 Split HistoryFileJvmIncrementalCompilerRunner and the current one
KT-74628 Incremental compilation runner does not check compiler exit code before mapping sources to classes

Tools. JPS

KT-60914 IC misses dependency to recompile when named kt file with JvmField instructed property was replaced with an object with the same name
KT-76495 JPS: delegated Maven builds use embeddable version of kotlin-serialization compiler plugin with non-embeddable Kotlin compiler
KT-76461 Fix “compilation of typealias does not check for clashes” for JPS
KT-75917 Unused imports may lead to inc compilation failure
KT-73379 Review the usage of JavaBuilder.IS_ENABLED inside the KotlinBuilder JSP builder
KT-63707 JPS: “Multiple values are not allowed for” caused by Compose

Tools. Kapt

KT-75936 K2 KAPT: unsupported FIR element kinds in constant evaluation
KT-64385 K2: Enable K2 KAPT by default
KT-76546 Kapt / CLI: ““compile” mode is not supported in Kotlin 2.x” with -version flag
KT-75942 K2 KAPT: underscore not allowed here
KT-40485 -Xjvm-default=all causes private interface methods to be generated in JVM target < 9 which is not supported in annotation processing
KT-75202 K2 kapt: mapped type class literal is converted incorrectly
KT-70797 Remove obsolete K2 kapt implementation based on Analysis API

Tools. Maven

KT-73012 Migrate Kotlin Maven plugin to the Build Tools API
KT-77036 Kotlin Maven plugin: ClassNotFoundException com.google.common.base.Joiner with compiler plugins in debug mode
KT-61285 Remove multiplatform “support” from Maven Plugin

Tools. Performance benchmarks

KT-75563 Fix crash on kotlin compiler server user project related to performance measurements

Tools. REPL

Fixes

KT-75632 Contunue deprecation of the REPL built into kotlinc
KT-76507 [K2 Repl] Delegated properties are not visible in the next snippet
KT-76508 [K2 Repl] Annotations on property accessors are not resolved
KT-75672 [K2 Repl] Serialization plugin crashes compiler backend
KT-76009 [K2 Repl] Kotlin-specific imports does not work if dependency is added to the classpath after 1st snippet
KT-75580 [K2 Repl] Cannot access snippet properties using Kotlin reflection
KT-75616 [K2 Repl] Sealed hierarchies causes a FileAnalysisException
KT-75593 [K2 Repl] Custom Delegates crash code gen
KT-75607 [K2 Repl] ScriptingConfiguration.jvm.jvmTarget is not respected
KT-74607 [K2 Repl] Lambda statement crashes code generation
KT-74615 [K2 REPL] Anonymous objects crash code generation
KT-74856 [K2 Repl] Snippet class files are missing Kotlin metadata
KT-74768 [K2 Repl] refineConfiguration does not update the classpath correctly
KT-74593 [K2 Repl] defaultImports does not work in ScriptCompilationConfiguration

Tools. Scripts

KT-75589 Scripts: “IndexOutOfBoundsException in jdk.internal.util.Preconditions.outOfBounds” when trying to extend a class which uses global variable
KT-76424 Dependencies in main.kts not working with 2.1.20
KT-76296 Kotlin script compiler crashes when secondary constructor calls a function
KT-76430 Migrate scripting plugin to new IR parameter API
KT-74004 “Evaluate expression” fails in scripts

Tools. Wasm

KT-76161 Wasm: “export startUnitTests was not found” after updating to Kotlin 2.1.20
KT-73398 K/Wasm: Separate from JS NPM infrastructure
KT-76948 Wasm: Rename kotlinBinaryenSetup and kotlinD8Setup
KT-74840 Wasm: Binaryen setup per project
KT-76657 K/Wasm: Composite build does not work with wasm tasks
KT-76656 K/Wasm: Change NPM project name of wasm projects
KT-76587 Wasm lock check failure says to run the JS lock upgrade
KT-76330 K/Wasm: update binaryen to 123 or newer
KT-74480 Projects using Compose don't run in Android Studio started from 2.1.20- Kotlin version