Changelog

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