Changelog

Analysis API

• KT-78187 Synthetic properties not to be shown as callables
• KT-72525 K2. red code and KIWA on new-lines in guarded when conditions (with parentheses)
• KT-61728 Analysis API: optimize AllCandidatesResolver.getAllCandidates

Analysis API. Code Compilation

• KT-76457 K2 IDE / KMP Debugger: KISEWA “Cannot compile a common source without a JVM counterpart” on evaluating inline fun from common module inside jvm
• KT-73084 K2 evaluator cannot resolve local variables standing at the closing brace

Analysis API. FIR

Performance Improvements

• KT-78132 Do not check FirElementBuilder#tryGetFirWithoutBodyResolve optimization for already resolved declarations

Fixes

• KT-72357 Implement partial body resolution
• KT-77629 K2: NPE: "org.jetbrains.kotlin.fir.java.declarations.FirJavaTypeParameter.performFirstRoundOfBoundsResolution"
• KT-76855 Analysis API: KaType.asPsiType returns null for a local inner class in dependent analysis tests
• KT-72718 ImplicitReceiverValue.createSnapshot creates invalid FIR if receiver is smart-casted
• KT-76811 Analysis API: resolveToFirSymbol finds a FirPropertySymbol for a KtScript in dependent analysis
• KT-73586 [Analysis API] Add lazyResolveToPhase(STATUS) before accessing modifiers of members
• KT-71135 AA: exception from sealed inheritors checker when analyzeCopy
• KT-75534 K2 AA: "Containing declaration should present for nested declaration class KtNamedFunction" with dangling annotation on top-level anonymous function
• KT-75687 K2: local variable doesn't get to the do-while scope
• KT-56543 LL FIR: rework lazy transformers so transformers modify only declarations they suppose to

Analysis API. Infrastructure

• KT-76809 Analysis API: Dependent analysis tests frequently work with the original element instead of the copied element

Analysis API. Light Classes

• KT-78076 DLC: KotlinDeclarationInCompiledFileSearcher missed accessors if types are boxed
• KT-77569 SLC: annotation missing from generated no-args constructor
• KT-75182 K2 AA. False positive red code "Unresolved reference" to a Kotlin method in Java when Kotlin uses a value class with [@JvmOverloads](https://github.com/JvmOverloads)
• KT-77564 Constructor with JvmOverloads and value class shouldn't mark regular constructors private
• KT-77505 K2: find usages on java accessor methods do not detect kotlin property accessor usages
• KT-76789 Annotation resolve shouldn't search through non-class members
• KT-76907 Wrong equality between repeatable annotation and container

Analysis API. Providers and Caches

• KT-74907 Analysis API: Apply platform-based library module content restrictions consistently
• KT-77578 Analysis API: Performance degradation of KaBaseResolutionScope.contains after introduction of library restriction scopes
• KT-77605 AA: Leaking KaDanglingFileModule through IdeKotlinPackageProvider
• KT-62474 Analysis API: Improve mergeability and performance of custom search scopes
• KT-77022 Get rid of ExpectBuiltinPostProcessor workaround
• KT-77248 Delegation of JavaModuleResolver is restricted to CliJavaModuleResolver
• KT-76850 LLFirLibrarySession cannot be cast to LLFirResolvableModuleSession
• KT-76952 Analysis API: when exhaustiveness analysis fails for sealed classes in dangling files
• KT-72390 Kotlin project full of red code

Analysis API. Stubs and Decompilation

• KT-77496 Support HAS_MUST_USE_RETURN_VALUE metadata flags in FirStubBasedMemberDeserializer
• KT-77778 Function receivers doesn't have annotations
• KT-77777 Receiver annotations shouldn't be present on types
• KT-77538 Support default property accessors with annotations
• KT-77763 Decompiled stubs miss inline modifier for property accessors
• KT-77309 Decompiled property from annotation constructor with default value should have a constant initializer
• KT-77168 Prefer DataInputOutputUtil for serialization/deserialization
• KT-77117 Flaky WRONG_ANNOTATION_TARGET diagnostic
• KT-76791 Function signature types are deserialized inconsistently
• KT-76947 Support functional types with context parameters

Analysis API. Surface

New Features

• KT-77278 Implement psi-based KaFirKotlinPropertyKtPropertyBasedSymbol#hasBackingField
• KT-70770 KaLocalVariableSymbol: support isLateInit

Fixes

• KT-75913 K2: SymbolLightLazyAnnotation evaluates arguments and replaces them with constants
• KT-78278 ISE: FIR element "class org.jetbrains.kotlin.fir.expressions.impl.FirErrorResolvedQualifierImpl" is not supported in constant evaluation at org.jetbrains.uast.kotlin.internal.FirKotlinUastConstantEvaluator.evaluate
• KT-73327 Cover all psi inputs with scope validity assertions
• KT-71876 Support storing parameter names in KaFunctionType
• KT-77738 AA: inconsistent KaType.allSupertypes regarding multiple iterations
• KT-73723 K2 AA, KaFirVisibilityChecker: protected member of superclass is not visible from anonymous object
• KT-78057 [Analysis API, K2] Context parameters are not resolved in KDoc
• KT-73758 K2 Mode: "KaEvaluator.evaluate" does not work for simple arithmetic expressions
• KT-72301 K2 AA. PSI should present for declaration built by Kotlin code on property access syntax of generic Java getter through Kotlin subclass
• KT-77730 K2: Unable to get a light PSI for a nested annotation used with fully-qualified name
• KT-73216 K2: unresolvable references in type parameters
• KT-71794 Analysis API: Types with errors have unresolved qualifiers in lambda parameters position
• KT-65846 Support parameter names in functional type rendering
• KT-76738 K2 AA: rendering constructor of sealed class inserts protected modifier
• KT-77515 KaTypeProvider#receiverType should be more tolerant to an error code
• KT-77333 K2 AA: KaFirTypeProvider.getType: InvalidFirElementTypeException: For TYPE_REFERENCE with text I, unexpected element of type: FirSuperReceiverExpressionImpl found
• KT-76044 K2 AA: isFun is true for restored symbol of Java interface with several methods
• KT-77264 KaTypeProvider#type should be more tolerant to an error code
• KT-77282 KaPropertySymbol: support isDelegatedProperty for libraries
• KT-77254 K2 AA: expectedType doesn't provide anything for parameter default value
• KT-74777 KaVariableSymbol.hasBackingField returns incorrect result for libraries
• KT-77280 Rename KaPropertyAccessorSymbol#isCustom to isNotDefault
• KT-77210 Analysis API: scopeContext shows implicit receiver with a class instance in the class constructor
• KT-77196 Clarify differences between KaPropertyAccessorSymbol#{isDefault, hasBody}
• KT-76577 Guard KaFirStopWorldCacheCleaner from deadlocks via threads waiting
• KT-76580 K2: No expected type for the second+ vararg argument
• KT-76750 K2. internal exception 'Unable to provide inlay hint' on typo in nested lambdas
• KT-73055 Get rid of the deprecated Analysis API API
• KT-70199 K2: ConcurrentModificationException at FirCallCompleter$LambdaAnalyzerImpl.analyzeAndGetLambdaReturnArguments

Backend. Wasm

Performance Improvements

• KT-70097 Optimize shared primitive variables in Native and Wasm

Fixes

• KT-67554 [Wasm] Consider to have reference equals or/and equals for function references
• KT-71521 K/Wasm: incorrect results on equality checks for capturing property references
• KT-71522 K/Wasm: incorrect results on equality checks for function references
• KT-77897 WasmJs: ClassCastException when using star-projection with nullable transformation in generic extension function
• KT-71517 K/Wasm: KClass::qualifiedName for local classes and objects returns non-null value
• KT-68309 WASM: Anonymous class simpleName returns "" instead of null
• KT-77272 K/Wasm: Remove kotlin.wasm.internal.ClosureBox* classes from the standard library
• KT-78036 K/Wasm: generate a message with "expected" and "actual" types in case of CCE
• KT-66106 Wasm: lambda was not invoked in test lambda2.kt
• KT-77855 [Wasm] Improve virtual function calls speed for lambdas
• KT-77501 Wasm: unsigned vararg compiles to invalid Wasm
• KT-76775 [Wasm] Inconsistent FP mod operation
• KT-77464 Wasm: KType.toString() has simple names even with -Xwasm-kclass-fqn
• KT-77465 Wasm: KTypeParamter printed without variance information

Compiler

New Features

• KT-32313 Support contracts for operator functions
• KT-27090 Support contracts in getter and setter for top-level extension properties
• KT-76766 Warning is missing for wrong subclass checking
• KT-45683 Allow generics in contract type assertions
• KT-65688 Generate when-expressions over final classes via invokedynamic typeSwitch + tableswitch on JDK 21+
• KT-54344 Trigger the unused expression warning for interpolated strings, even when the expression may have side effects
• KT-74807 Implement 'full' unused return value checker mode
• KT-77653 K/N: an optimization pass to remove redundant type checks
• KT-64477 Enhance KotlinLightParser to make it able to parse scripts
• KT-73256 Implement all meta-target for annotations

Performance Improvements

• KT-74981 Kotlin/Native: large binary size for iOS target in 2.1.0(LLVM16)
• KT-77838 K2: consider replacing LinkedHashMap with HashMap inside scopes and scope session
• KT-77993 Optimize old PSI/LightTree Kotlin parser
• KT-76698 Android Studio compose preview holds read lock 700ms for KaCompilerFacility API
• KT-68677 Kotlin compilation issue when using EnumMap and Pair

Fixes

• KT-76635 Implement Data-Flow Based Exhaustiveness Support
• KT-76839 False-negative MISSING_DEPENDENCY_CLASS on parameter of data class constructor
• KT-77685 "IllegalArgumentException: Sequence contains more than one matching element"
• KT-76365 K2: Missing ABSTRACT_SUPER_CALL
• KT-77709 Missing diagnostics of accessing less visible objects in inline function
• KT-77577 False positive exposed type warnings
• KT-77095 FIR: Report warnings on exposure of references to invisible references in inline functions
• KT-76981 Move exposed type checker to regular checkers
• KT-76478 FIR: Implement IDE-only checker for types exposed in inline function
• KT-71854 K2 IDE. False positive red code because of external annotation on a generic parameter
• KT-67335 K2: Infers Int instead of Long for an ILT
• KT-77728 Drop controversial experimental checkers
• KT-17417 Loops in delegation: no compilation error on non-abstract class with abstract method that never implemented
• KT-75033 Split JvmBackendPipelinePhase to be able to provide a custom implementation of writeOutputs
• KT-67146 UPPER_BOUND_VIOLATED missing on implicit type arguments
• KT-75268 K2: Implement the new compilation scheme for MPP (compiler part)
• KT-76739 Dubious argument type mismatch "actual type is 'String', but 'String' was expected" caused by wrong number of type arguments
• KT-76872 Anonymous context parameters are not visible in debugger
• KT-74088 Kotlin Debugger: CCE on evaluating private suspend function
• KT-78230 Add more test cases to the holdsIn contracts
• KT-78111 K2: Approximation of captured star projection in function type produces Function1<Nothing?, Unit> in IR
• KT-77273 K/N: Remove the kotlin.native.internal.Ref class from the standard library
• KT-73995 JVM bytecode: Bad name for value class field
• KT-73013 Kotlin Debugger: ISE “No mapping for symbol: VALUE_PARAMETER” on evaluating callable reference to local function with closure in it
• KT-77485 Add constraints logging to inference
• KT-76504 Find and deprecate actively used parts of K1 API
• KT-75338 K2 Mode: False positive "Redundant assignment" diagnostic on variable captured by local function
• KT-77648 K2: False negative DSL_SCOPE_VIOLATION when using named argument for lambda with annotated function type
• KT-64499 Report error on overloading by order of context parameters
• KT-78084 Unify deprecation warning messages
• KT-76776 [@MustUseReturnValue](https://github.com/MustUseReturnValue) doesn't affect nested scopes
• KT-77545 [@NoInfer](https://github.com/NoInfer) on receiver type leads to false positive type mismatch when generic type is specified explicitly and closest implicit receiver is of incorrect type
• KT-76772 [@NoInfer](https://github.com/NoInfer) on a context parameter's type leads to a false-positive context argument ambiguity error regardless of the closest implicit values' types if there are multiple of them at the call site
• KT-76771 [@NoInfer](https://github.com/NoInfer) on context parameter type leads to a false-positive type mismatch when generic type is specified explicitly and closest implicit value at the call site is of a mismatching type
• KT-77156 INITIALIZATION_BEFORE_DECLARATION is not reported in anonymous object
• KT-78060 UNRESOLVED_REFERENCE in fp-space
• KT-67555 Debug metadata: map the Continuation label to the next executable location in file
• KT-77756 Add experimental language version 2.4
• KT-77723 Refine the message for ArrayEqualityCanBeReplacedWithEquals checker
• KT-75178 Inline functions in conjunction with [@JvmStatic](https://github.com/JvmStatic) may result in bytecode errors
• KT-77390 Prototype lazy loading of stdlib symbols in Native
• KT-77921 False positive EXTENSION_SHADOWED_BY_MEMBER when member has context parameters
• KT-76767 AMBIGUOUS_CONTEXT_ARGUMENT should report the name of the context parameter in addition to the type
• KT-77444 K2: False negative "Unchecked cast" with casting from MutableList to MutableList
• KT-63348 K2: FIR2IR should properly pass expected types
• KT-17460 Diagnostics and intention on suspend function that is overriden with non-suspend one.
• KT-77627 K2: consider getting rid of NEW_INFERENCE_ERROR
• KT-75833 K2: Extra [ANNOTATION_ARGUMENT_MUST_BE_CONST] when passing regex-like strings as annotation arguments
• KT-77547 Native: add a check that the logic looking for stdlib-related bitcode is not used when compiling sources to a klib
• KT-77206 Remove PARAMETER_NAME_CHANGED_ON_OVERRIDE suppression in KMP lexers
• KT-77679 Update syntax-api dependency in KMP Kotlin parser
• KT-77705 K2: Consuming data class compiled with kotlin 1.0.5 breaks the K2 compiler
• KT-77563 False-positive smart cast with captured local in init block causes NPE
• KT-77696 ISE "couldn't find inline method" on kotlin/Result compiled by old Kotlin version
• KT-76931 K2: Annotation on do-while expression captures variables from inside the loop
• KT-77183 Metadata: remove multi-field value class representation
• KT-77678 Apply found optimization to Kotlin KMP parser
• KT-60127 K2: Support scripts with LightTree-based raw FIR building
• KT-77656 K/N: fix the super type for local delegated properties
• KT-75907 Inference/PCLA: consider storing semi-fixed variables in inference session
• KT-77144 Implement KMP Kotlin parser
• KT-77352 Implement KMP Expression parser
• KT-76984 SYNCHRONIZED_BLOCK_ON_JAVA_VALUE_BASED_CLASS isn't reported for primitive wrapper classes instantiated within the scope
• KT-67471 K2: "Unresolved reference" on incorrect term of FQ name
• KT-77269 [K/N] external calls checker crashes when used with caches
• KT-74133 FIR: use EmptyDeprecationsPerUseSite consistently in symbols
• KT-77100 java.lang.Void type is not ignorable
• KT-77491 K2: No SUPERTYPE_IS_EXTENSION_FUNCTION_TYPE when using typealias
• KT-77490 Report error on contextual function type in supertype
• KT-77431 Functional type with a context is allowed as an upper-bound
• KT-77432 Context isn't passed properly when functional type with a context is used as a type argument
• KT-77417 There is no TYPE_VARIANCE_CONFLICT_ERROR when 'out' type is used in context
• KT-62631 Improve expect-actual "checking" incompatibilities reporting
• KT-77481 Support ExpectRefinement feature in HMPP compilation scheme
• KT-77268 Make sure that -Xreturn-value-checker also enables -XX:UnnamedLocalVariables
• KT-65719 K1/K2: Nullness defaults from subclass unsoundly applied to method in superclass
• KT-53836 In type-parameter declarations, recognize JSpecify annotations only on bounds
• KT-73658 JSpecify [@NonNull](https://github.com/NonNull) annotation on type-parameter bound prevents type-variable usages from being platform types
• KT-77000 Leave ForbidInferOfInvisibleTypeAsReifiedOrVararg as a warning
• KT-74084 K2: False negative [NO_ELSE_IN_WHEN]
• KT-77451 FirLazyResolveContractViolationException for test with overridden delegate
• KT-77257 Report compilation error when in generated JVM bytecode there is a need for CHECKCAST of the conditional expression to the inaccessible interface
• KT-77256 Report compilation error when in generated JVM bytecode there is a need for CHECKCAST of the functional call result to the inaccessible interface
• KT-76356 K2 evaluation fails on evaluating inline methods if there is an inline with AutoCloseable
• KT-73786 Evaluator: cannot evaluate inline methods with reified parameter
• KT-77204 Native: XCode strip command causes flaky tests
• KT-77351 Implement KMP KDoc parser
• KT-76597 False negative opt-in required on delegated constructor call
• KT-76667 Mark the class implementation of interface function with ACC_BRIDGE in the class file
• KT-77181 K2: a nested typealias annotation observes member declarations of the outer class
• KT-77180 K2: Wrong scope for annotation arguments in the constructor header
• KT-77287 Try enforcing source != null when origin == Source
• KT-76135 K2: drop pre-1.8 language features from compiler code
• KT-77231 Reflection: CCE on resuming coroutine after callSuspend if result is a generic inline class substituted with primitive
• KT-77031 Investigate the actual need of deduplicating provider in HMPP compilation scheme
• KT-77050 Implement KMP KDoc lexer
• KT-77048 Implement KMP Kotlin lexer
• KT-77044 Consolidate, refine and update jFlex dependency
• KT-77252 It is impossible to declare an unnamed variable in a script
• KT-58137 K2: ISE "Usage of default value argument for this annotation is not yet possible" when instantiating Kotlin annotation with default parameter from another module
• KT-77140 Protect ConstraintSystemCompletionMode.UNTIL_FIRST_LAMBDA with opt-in
• KT-75695 Bogus "Assigned value is never read" warning for prefix ++ operator
• KT-52706 Bad signature for generic value classes with substituted type parameter
• KT-77149 IllegalArgumentException: source must not be null
• KT-76806 K2: AIOOBE in FirEqualityCompatibilityChecker
• KT-72391 KJS: (a * b).toDouble_ygsx0s_k$ is not a function
• KT-76950 K2: "IllegalArgumentException: Inline class types should have the same representation: Lkotlin/UByte; != B" with nullable UByte
• KT-64731 K2: Annotation on inline function or inside inline function is hit by debugger
• KT-76043 Native: NotImplementedError: Generation of stubs for class org.jetbrains.kotlin.ir.symbols.impl.IrFieldSymbolImpl is not supported yet
• KT-77126 Transitive dependency mismatch between Kotlin Gradle Plugin and Scripting dependencies
• KT-65440 K2: Mark all potential implementations of List.getFirst()/getLast() as deprecated independently of JDK
• KT-72831 ANNOTATION_USED_AS_ANNOTATION_ARGUMENT missing in some cases in K2
• KT-73707 Remove dependency on ":compiler:backend.jvm" from Native
• KT-75499 CheckerContext#{containingDeclaration, containingFile} in checkers should return symbols
• KT-76548 False positive TYPE_MISMATCH when resolving an expression with the expected type from the upper bound
• KT-76142 K2: [@RequiresOptIn](https://github.com/RequiresOptIn) warning does not display the custom message when using concatenated strings.
• KT-68699 Kotlin Debugger: UPAE “lateinit property parent has not been initialized” on trying evaluate enumValues(), enumEntries() from inlined function with reified parameter
• KT-63267 K2: incorrect line numbers after smart cast of an extension receiver
• KT-71309 Kotlin Debugger: UnsupportedOperationException on calling method with reified type parameter
• KT-74912 K2: Investigate irrelevant ARGUMENT_TYPE_MISMATCH on top-level lambdas
• KT-74569 K2: Linenumber of annotation is present in constructor's LVT
• KT-74657 K2: Linenumber for annotation on local variable is present in LVT
• KT-74570 K2: Linenumber for annotation on property is present in LVT
• KT-76749 NONE_APPLICABLE message is unreadable for stdlib context function
• KT-74932 Investigate false-negative ARGUMENT_TYPE_MISMATCH on a nested anonymous function
• KT-74545 Redundant TYPE_MISMATCH in variable initializer with call
• KT-76774 K2: Simplify ResolutionMode.WithExpectedType contracts
• KT-76689 Unnamed local variable with type and without initializer is allowed
• KT-76746 ClassCastException: class org.jetbrains.kotlin.fir.types.impl.FirUserTypeRefImpl cannot be cast to class
• KT-76754 K2: Compiler doesn't check annotations on array literals (as annotation arguments)
• KT-76674 The function isn't called from unnamed local variable initializer
• KT-73348 AssertionError from isCompiledToJvmDefault on super call of suspend function with composable function parameter
• KT-73527 Prohibit (via a deprecation warning) accessing nested class through generic outer class
• KT-59886 K2: Disappeared ERROR_IN_CONTRACT_DESCRIPTION
• KT-57949 FIR: SignatureEnhancement: mutation of java enum entry
• KT-57911 K2: Contracts are not inherited by substitution overrides
• KT-47398 'null' EnhancedNullability value in String-based 'when' might produce different behavior depending on whether 'when' is "optimized" or not

Compose compiler

Fixes

• b/394891628 Allow specifying target version of Compose runtime
• b/424454512 Recreate FirApplierInferencer for each check
• b/417406922 Restrict references to [@Composable](https://github.com/Composable) properties
• b/282135108, b/349866442 [Compose] Enable applier checking when using FIR
• b/408492167 Emit parameter names in Compose source information
• b/307592552 Add BigInteger and BigDecimal to the list of known stable classes
• b/414547195 Unwrap type casts when inferring [@Composable](https://github.com/Composable) call arguments

IR. Inlining

Fixes

• KT-76425 Do not store signatures of preprocessed inline functions in KLIBs
• KT-76763 [Inliner] Don't use attributeOwnerId to pass info from Inliner to non-JVM backends
• KT-72464 [Native][JS][Wasm] Non-local return through suspend conversion breaks the IR inliner
• KT-77102 [Inliner] Expression uses unlinked type parameter symbol
• KT-77079 IR: Report warnings on exposure of references to invisible declarations in inline functions
• KT-69797 [references] Accessors for private function/constructor/property references are not generated
• KT-76454 Investigate erasure of class type parameters during inliner
• KT-72593 [K/N] Add NativeIrInliningFacade to CrossCompilationIdentityTest
• KT-70969 IR Inliner: Ensure that common prefix at 1st phase does not affect KLIB signatures
• KT-75937 [IR Inliner] Umbrella for failing tests due to public inliner
• KT-77295 Improve Diagnostic Message Formatting for Private API Exposure in Inline Functions
• KT-77047 Ir Ininler: crash on fake override in private class from more visible class
• KT-77336 [references] Synthetic accessor test for private top-level function accessed via reference fails with No function found for symbol
• KT-76761 [Inliner] non-JVM IR Inliner incorrectly uses K/JVM-specific code
• KT-76712 [Inliner] No function found for symbol '/|?'
• KT-76711 [Inliner] Reference to function 'privateMethod' can not be evaluated

IR. Tree

• KT-76813 IR validator: not all symbols/references are visited

JVM. Reflection

• KT-74529 Context parameters support in reflection
• KT-52170 Reflection: typeOf<Array> gives classifier LongArray

JavaScript

New Features

• KT-70486 K/JS: exported exception types should extend Error
• KT-19016 Define accessors as enumerable

Fixes

• KT-55256 KJS: non-exported subclass with a no-parameter function overload doesn't compile
• KT-76034 passProcessArgvToMainFunction contains the node path and script path
• KT-78169 KJS: [NON_EXPORTABLE_TYPE] with @JsExport class if @JsStatic companion method returns an out type
• KT-70295 KLIB stdlib: Unify intrinsics for boxing captured variables in lambdas across non-JVM backends
• KT-76093 Support new callable reference nodes in partial linkage in Kotlin/JS
• KT-77320 KJS: Big.js times() is compiled to multiply (*) operator
• KT-77430 K/JS: Remove sharedBox* intrinsics from the standard library
• KT-69297 Deprecate referencing inlineable lambdas in js() calls
• KT-73267 KJS: IC: "FileNotFoundException": Build failures with Kotlin 2.1-RC and RC2
• KT-76912 KJS: [@JsStatic](https://github.com/JsStatic) can't be used for companion objects implementing external interfaces
• KT-77242 Kotlin/JS & Kotlin/Wasm backends: Artificially apply reverse topo-order after IR linkage
• KT-77649 KJS: es-arrow-functions requires explicit opt-in when target is ES2015
• KT-77372 KJS: NullPointerException at JsIntrinsics$JsReflectionSymbols
• KT-77620 Fix failing IC tests on Windows
• KT-77190 Migrate JS diagnostic tests to the new CLI-based test facades (1st phase only)
• KT-77371 [K/N][K/JS][K/Wasm] Unify visibility rules for generated default argument stubs
• KT-77148 KJS: "Uncaught TypeError: (intermediate value).l(...).m is not a function" during production build run
• KT-77193 Migrate JS irText tests to the new CLI-based test facades (1st phase only)
• KT-77192 Migrate JS ABI reader tests to the new CLI-based test facades (1st phase only)
• KT-77187 Migrate JS box tests to the new CLI-based test facades (1st phase only)
• KT-77027 Migrate 1st phase facades to the phased CLI infrastructure in JS tests
• KT-76027 KJS: "ReferenceError: entries is not defined": Accessing entries of an enum arbitrarily fails with println()
• KT-76232 Suspend contextual function with extension receiver results in wrong values at runtime in JS

Klibs

• KT-75980 [Klib] Reduce serialized size of IrFileEntries for sparse usage of another source files
• KT-75766 PL: Error on building fake override with multiple overridden members with unbound symbols in return type
• KT-75757 PL: Error on building fake overrides with unbound symbols in value parameters
• KT-76827 KLIB cross-compilation tests: Don't use IR hashes and metadata hashes in test data
• KT-76266 Move trigger of :tools:binary-compatibility-validator:check to native/native.tests/klib-ir-inliner
• KT-74815 KLIB resolver can't consume metadata klibs between source sets when abi_versions diverge
• KT-76725 KLIB ABI export in older version: Restore legacy directories
• KT-76471 Partial linkage: add an attribute if a class is invalid

Language Design

• KT-32993 Contract to specify that a function parameter is always true inside lambda
• KT-8889 Contracts: if a given function parameter is not null, the result is not null

Libraries

• KT-76389 Provide update functions for common atomics
• KT-34132 Contract for ClosedRange.contains(T?) operator
• KT-78242 Move IrLinkageError to the common non-JVM part of the standard library
• KT-73853 Provide vararg constructors for Atomic Arrays
• KT-76773 stdlib: contextOf's type argument can be inferred via contextOf's context argument
• KT-67819 Document collection interfaces contracts

Native

• KT-74662 Consider providing a way to enable stack canaries for Kotlin/Native binaries
• KT-76178 LLVM Update: symbol '__ZnwmSt19__type_descriptor_t' missing
• KT-77378 [macos] Loading libraries with non resolved paths runs XProtectService
• KT-61549 Kotlin/Native: remove kotlin-native/Interop/JsRuntime
• KT-76563 LLVM Update: numerous "was built for newer 'macOS' version" warnings

Native. C and ObjC Import

• KT-71400 Fix disabled -fmodules testing for stdarg.h

Native. ObjC Export

• KT-76974 Include conflicting element in objc export warnings
• KT-78034 ObjCExport: primitive type extension translated as static method
• KT-77781 ObjCExport: support [@ObjCName](https://github.com/ObjCName) for function parameters and receiver parameters
• KT-77592 KMP plugin uses incorrect Swift name from ObjCName annotation
• KT-77625 ObjCExport: ObjCName annotation adds kotlin name swift_name
• KT-77484 KotlinConf app: Invalid identifiers in ObjCHeader.render
• KT-77500 IllegalStateException during generating ObjC header stubs
• KT-76338 Native, ObjCExport: Replace name mangling of special method families

Native. Runtime. Memory

• KT-63143 Kotlin/Native: execute Cleaners on the finalizer thread

Native. Swift Export

• KT-77650 Swift export execution tests fail with caches enabled
• KT-77634 K/N: swift export tests started failing after hyper-existentials
• KT-77290 Transitive Export on swift export can duplicate declarations

Tools. CLI

• KT-77030 Implement setup of HMPP sessions for KLib-based compilers
• KT-75812 Basic DSL for compiler arguments representation
• KT-76828 Warning doesn't exist error with -Xwarning-level when the source file has no code
• KT-76957 Incorrect error message when severity is set with -Xsuppress-warning and -Xwarning-level for the same diagnostic
• KT-76111 kotlinc warns about org.fusesource.jansi.internal.JansiLoader call to System.load
• KT-76447 Remove -Xjps compiler argument

Tools. Compiler Plugin API

• KT-77157 Cannot create a symbol pointer for local class generated by FirFunctionCallRefinementExtension

Tools. Compiler Plugins

• KT-75876 PowerAssert: don't display results for assertion operator
• KT-75514 [JS][Native] Add IrPreSerializationLoweringFacade to Atomicfu test runners
• KT-77719 Remove suppress INVISIBLE_REFERENCE from DataFrame plugin
• KT-77691 Kotlin DataFrame plugin: IR and FIR anonymous functions have inconsistent receivers
• KT-77339 Update kotlin dataframe dependency to 1.0.0-dev-6925
• KT-77455 kotlin-dataframe plugin throws NoClassDefFoundError in IDE
• KT-77437 Kotlin DataFrame: Add configuration key to disable top level properties generator
• KT-74366 Delete kotlin-android-extensions compiler plugin
• KT-73364 Migrate atomicfu sources to new IR parameter API

Tools. Compiler plugins. Serialization

• KT-73365 Migrate kotlinx-serialization sources to new IR parameter API

Tools. Gradle

• KT-77546 Implement basic support for HMPP compilation scheme support in KGP
• KT-77107 Introduce Kotlin ecosystem plugin
• KT-63383 Add compiler performance metrics to Native build reports
• KT-75921 Make Swift Export available by default
• KT-67291 Enable Project Isolation AND/OR Configuration Cache mode for Gradle Integration tests
• KT-77785 Add -fmodules option to CocoaPod dependency by default
• KT-76353 Handle migration to stable -jvm-default in KGP: replace deprecated option and suppress warnings
• KT-77163 Migrate Swift Export IT to injections
• KT-76740 Use Problems API for warning introduced in KT-75808

Tools. Gradle. Compiler plugins

• KT-66728 Deprecate kapt.use.k2 property

Tools. Gradle. JS

• KT-77073 generateTypeScriptDefinitions() does not add generated .d.ts file to package.json automatically

Tools. Gradle. Multiplatform

• KT-77414 KMP dependencies in detached source sets cause IDE resolution to write error logs: "kotlin-project-structure-metadata.json (No such file or directory)"
• KT-76200 TestModuleProperties.productionModuleName for JVM module isn't present with 2.1.20-RC

Tools. Gradle. Native

• KT-68256 Reduce commonizer max heap size to default 3g and allow users to configure it
• KT-77977 "Unknown hardware platform: riscv64" on JVM project build

Tools. Incremental Compile

• KT-60653 IC does not handle changes in inline functions objects/lambdas correctly
• KT-69075 Incremental compilation: smartcast is impossible on field with [@JvmName](https://github.com/JvmName)

Tools. JPS

• KT-75460 Adding [@PurelyImplements](https://github.com/PurelyImplements) annotation to a List does not cause incremental recompile of affected files
• KT-50594 Fix org.jetbrains.kotlin.arguments.CompilerArgumentsContentProspectorTest

Tools. Kapt

• KT-77853 K2 KAPT: backend internal error: exception during IR fake override builder
• KT-73322 Migrate FirKaptAnalysisHandlerExtension compilation pipeline to the phased structure

Tools. Maven. Compiler plugins

• KT-77511 Add maven plugin for Kotlin DataFrame plugin

Tools. REPL

• KT-77470 [K2 Repl] Lazy Properties crash code generation

Tools. Scripts

• KT-78378 "Explain" feature of the kotlin script fails on hidden variables

Tools. Wasm

• KT-75714 Wasm: Move tooling NPM dependencies outside user project
• KT-76838 K/Wasm: No possible to set downloadBaseUrl to null for D8 and Binaryen

Changelog

Analysis API

• KT-78187 Synthetic properties not to be shown as callables
• KT-72525 K2. red code and KIWA on new-lines in guarded when conditions (with parentheses)
• KT-61728 Analysis API: optimize AllCandidatesResolver.getAllCandidates

Analysis API. Code Compilation

• KT-76457 K2 IDE / KMP Debugger: KISEWA “Cannot compile a common source without a JVM counterpart” on evaluating inline fun from common module inside jvm
• KT-73084 K2 evaluator cannot resolve local variables standing at the closing brace

Analysis API. FIR

Performance Improvements

• KT-78132 Do not check FirElementBuilder#tryGetFirWithoutBodyResolve optimization for already resolved declarations

Fixes

• KT-72357 Implement partial body resolution
• KT-77629 K2: NPE: "org.jetbrains.kotlin.fir.java.declarations.FirJavaTypeParameter.performFirstRoundOfBoundsResolution"
• KT-76855 Analysis API: KaType.asPsiType returns null for a local inner class in dependent analysis tests
• KT-72718 ImplicitReceiverValue.createSnapshot creates invalid FIR if receiver is smart-casted
• KT-76811 Analysis API: resolveToFirSymbol finds a FirPropertySymbol for a KtScript in dependent analysis
• KT-73586 [Analysis API] Add lazyResolveToPhase(STATUS) before accessing modifiers of members
• KT-71135 AA: exception from sealed inheritors checker when analyzeCopy
• KT-75534 K2 AA: "Containing declaration should present for nested declaration class KtNamedFunction" with dangling annotation on top-level anonymous function
• KT-75687 K2: local variable doesn't get to the do-while scope
• KT-56543 LL FIR: rework lazy transformers so transformers modify only declarations they suppose to

Analysis API. Infrastructure

• KT-76809 Analysis API: Dependent analysis tests frequently work with the original element instead of the copied element

Analysis API. Light Classes

• KT-78076 DLC: KotlinDeclarationInCompiledFileSearcher missed accessors if types are boxed
• KT-77569 SLC: annotation missing from generated no-args constructor
• KT-75182 K2 AA. False positive red code "Unresolved reference" to a Kotlin method in Java when Kotlin uses a value class with [@JvmOverloads](https://github.com/JvmOverloads)
• KT-77564 Constructor with JvmOverloads and value class shouldn't mark regular constructors private
• KT-77505 K2: find usages on java accessor methods do not detect kotlin property accessor usages
• KT-76789 Annotation resolve shouldn't search through non-class members
• KT-76907 Wrong equality between repeatable annotation and container

Analysis API. Providers and Caches

• KT-74907 Analysis API: Apply platform-based library module content restrictions consistently
• KT-77578 Analysis API: Performance degradation of KaBaseResolutionScope.contains after introduction of library restriction scopes
• KT-77605 AA: Leaking KaDanglingFileModule through IdeKotlinPackageProvider
• KT-62474 Analysis API: Improve mergeability and performance of custom search scopes
• KT-77022 Get rid of ExpectBuiltinPostProcessor workaround
• KT-77248 Delegation of JavaModuleResolver is restricted to CliJavaModuleResolver
• KT-76850 LLFirLibrarySession cannot be cast to LLFirResolvableModuleSession
• KT-76952 Analysis API: when exhaustiveness analysis fails for sealed classes in dangling files
• KT-72390 Kotlin project full of red code

Analysis API. Stubs and Decompilation

• KT-77496 Support HAS_MUST_USE_RETURN_VALUE metadata flags in FirStubBasedMemberDeserializer
• KT-77778 Function receivers doesn't have annotations
• KT-77777 Receiver annotations shouldn't be present on types
• KT-77538 Support default property accessors with annotations
• KT-77763 Decompiled stubs miss inline modifier for property accessors
• KT-77309 Decompiled property from annotation constructor with default value should have a constant initializer
• KT-77168 Prefer DataInputOutputUtil for serialization/deserialization
• KT-77117 Flaky WRONG_ANNOTATION_TARGET diagnostic
• KT-76791 Function signature types are deserialized inconsistently
• KT-76947 Support functional types with context parameters

Analysis API. Surface

New Features

• KT-77278 Implement psi-based KaFirKotlinPropertyKtPropertyBasedSymbol#hasBackingField
• KT-70770 KaLocalVariableSymbol: support isLateInit

Fixes

• KT-75913 K2: SymbolLightLazyAnnotation evaluates arguments and replaces them with constants
• KT-78278 ISE: FIR element "class org.jetbrains.kotlin.fir.expressions.impl.FirErrorResolvedQualifierImpl" is not supported in constant evaluation at org.jetbrains.uast.kotlin.internal.FirKotlinUastConstantEvaluator.evaluate
• KT-73327 Cover all psi inputs with scope validity assertions
• KT-71876 Support storing parameter names in KaFunctionType
• KT-77738 AA: inconsistent KaType.allSupertypes regarding multiple iterations
• KT-73723 K2 AA, KaFirVisibilityChecker: protected member of superclass is not visible from anonymous object
• KT-78057 [Analysis API, K2] Context parameters are not resolved in KDoc
• KT-73758 K2 Mode: "KaEvaluator.evaluate" does not work for simple arithmetic expressions
• KT-72301 K2 AA. PSI should present for declaration built by Kotlin code on property access syntax of generic Java getter through Kotlin subclass
• KT-77730 K2: Unable to get a light PSI for a nested annotation used with fully-qualified name
• KT-73216 K2: unresolvable references in type parameters
• KT-71794 Analysis API: Types with errors have unresolved qualifiers in lambda parameters position
• KT-65846 Support parameter names in functional type rendering
• KT-76738 K2 AA: rendering constructor of sealed class inserts protected modifier
• KT-77515 KaTypeProvider#receiverType should be more tolerant to an error code
• KT-77333 K2 AA: KaFirTypeProvider.getType: InvalidFirElementTypeException: For TYPE_REFERENCE with text I, unexpected element of type: FirSuperReceiverExpressionImpl found
• KT-76044 K2 AA: isFun is true for restored symbol of Java interface with several methods
• KT-77264 KaTypeProvider#type should be more tolerant to an error code
• KT-77282 KaPropertySymbol: support isDelegatedProperty for libraries
• KT-77254 K2 AA: expectedType doesn't provide anything for parameter default value
• KT-74777 KaVariableSymbol.hasBackingField returns incorrect result for libraries
• KT-77280 Rename KaPropertyAccessorSymbol#isCustom to isNotDefault
• KT-77210 Analysis API: scopeContext shows implicit receiver with a class instance in the class constructor
• KT-77196 Clarify differences between KaPropertyAccessorSymbol#{isDefault, hasBody}
• KT-76577 Guard KaFirStopWorldCacheCleaner from deadlocks via threads waiting
• KT-76580 K2: No expected type for the second+ vararg argument
• KT-76750 K2. internal exception 'Unable to provide inlay hint' on typo in nested lambdas
• KT-73055 Get rid of the deprecated Analysis API API
• KT-70199 K2: ConcurrentModificationException at FirCallCompleter$LambdaAnalyzerImpl.analyzeAndGetLambdaReturnArguments

Backend. Wasm

Performance Improvements

• KT-70097 Optimize shared primitive variables in Native and Wasm

Fixes

• KT-67554 [Wasm] Consider to have reference equals or/and equals for function references
• KT-71521 K/Wasm: incorrect results on equality checks for capturing property references
• KT-71522 K/Wasm: incorrect results on equality checks for function references
• KT-77897 WasmJs: ClassCastException when using star-projection with nullable transformation in generic extension function
• KT-71517 K/Wasm: KClass::qualifiedName for local classes and objects returns non-null value
• KT-68309 WASM: Anonymous class simpleName returns "" instead of null
• KT-77272 K/Wasm: Remove kotlin.wasm.internal.ClosureBox* classes from the standard library
• KT-78036 K/Wasm: generate a message with "expected" and "actual" types in case of CCE
• KT-66106 Wasm: lambda was not invoked in test lambda2.kt
• KT-77855 [Wasm] Improve virtual function calls speed for lambdas
• KT-77501 Wasm: unsigned vararg compiles to invalid Wasm
• KT-76775 [Wasm] Inconsistent FP mod operation
• KT-77464 Wasm: KType.toString() has simple names even with -Xwasm-kclass-fqn
• KT-77465 Wasm: KTypeParamter printed without variance information

Compiler

New Features

• KT-32313 Support contracts for operator functions
• KT-27090 Support contracts in getter and setter for top-level extension properties
• KT-76766 Warning is missing for wrong subclass checking
• KT-45683 Allow generics in contract type assertions
• KT-65688 Generate when-expressions over final classes via invokedynamic typeSwitch + tableswitch on JDK 21+
• KT-54344 Trigger the unused expression warning for interpolated strings, even when the expression may have side effects
• KT-74807 Implement 'full' unused return value checker mode
• KT-77653 K/N: an optimization pass to remove redundant type checks
• KT-64477 Enhance KotlinLightParser to make it able to parse scripts
• KT-73256 Implement all meta-target for annotations

Performance Improvements

• KT-74981 Kotlin/Native: large binary size for iOS target in 2.1.0(LLVM16)
• KT-77838 K2: consider replacing LinkedHashMap with HashMap inside scopes and scope session
• KT-77993 Optimize old PSI/LightTree Kotlin parser
• KT-76698 Android Studio compose preview holds read lock 700ms for KaCompilerFacility API
• KT-68677 Kotlin compilation issue when using EnumMap and Pair

Fixes

• KT-76635 Implement Data-Flow Based Exhaustiveness Support
• KT-76839 False-negative MISSING_DEPENDENCY_CLASS on parameter of data class constructor
• KT-77685 "IllegalArgumentException: Sequence contains more than one matching element"
• KT-76365 K2: Missing ABSTRACT_SUPER_CALL
• KT-77709 Missing diagnostics of accessing less visible objects in inline function
• KT-77577 False positive exposed type warnings
• KT-77095 FIR: Report warnings on exposure of references to invisible references in inline functions
• KT-76981 Move exposed type checker to regular checkers
• KT-76478 FIR: Implement IDE-only checker for types exposed in inline function
• KT-71854 K2 IDE. False positive red code because of external annotation on a generic parameter
• KT-67335 K2: Infers Int instead of Long for an ILT
• KT-77728 Drop controversial experimental checkers
• KT-17417 Loops in delegation: no compilation error on non-abstract class with abstract method that never implemented
• KT-75033 Split JvmBackendPipelinePhase to be able to provide a custom implementation of writeOutputs
• KT-67146 UPPER_BOUND_VIOLATED missing on implicit type arguments
• KT-75268 K2: Implement the new compilation scheme for MPP (compiler part)
• KT-76739 Dubious argument type mismatch "actual type is 'String', but 'String' was expected" caused by wrong number of type arguments
• KT-76872 Anonymous context parameters are not visible in debugger
• KT-74088 Kotlin Debugger: CCE on evaluating private suspend function
• KT-78230 Add more test cases to the holdsIn contracts
• KT-78111 K2: Approximation of captured star projection in function type produces Function1<Nothing?, Unit> in IR
• KT-77273 K/N: Remove the kotlin.native.internal.Ref class from the standard library
• KT-73995 JVM bytecode: Bad name for value class field
• KT-73013 Kotlin Debugger: ISE “No mapping for symbol: VALUE_PARAMETER” on evaluating callable reference to local function with closure in it
• KT-77485 Add constraints logging to inference
• KT-76504 Find and deprecate actively used parts of K1 API
• KT-75338 K2 Mode: False positive "Redundant assignment" diagnostic on variable captured by local function
• KT-77648 K2: False negative DSL_SCOPE_VIOLATION when using named argument for lambda with annotated function type
• KT-64499 Report error on overloading by order of context parameters
• KT-78084 Unify deprecation warning messages
• KT-76776 [@MustUseReturnValue](https://github.com/MustUseReturnValue) doesn't affect nested scopes
• KT-77545 [@NoInfer](https://github.com/NoInfer) on receiver type leads to false positive type mismatch when generic type is specified explicitly and closest implicit receiver is of incorrect type
• KT-76772 [@NoInfer](https://github.com/NoInfer) on a context parameter's type leads to a false-positive context argument ambiguity error regardless of the closest implicit values' types if there are multiple of them at the call site
• KT-76771 [@NoInfer](https://github.com/NoInfer) on context parameter type leads to a false-positive type mismatch when generic type is specified explicitly and closest implicit value at the call site is of a mismatching type
• KT-77156 INITIALIZATION_BEFORE_DECLARATION is not reported in anonymous object
• KT-78060 UNRESOLVED_REFERENCE in fp-space
• KT-67555 Debug metadata: map the Continuation label to the next executable location in file
• KT-77756 Add experimental language version 2.4
• KT-77723 Refine the message for ArrayEqualityCanBeReplacedWithEquals checker
• KT-75178 Inline functions in conjunction with [@JvmStatic](https://github.com/JvmStatic) may result in bytecode errors
• KT-77390 Prototype lazy loading of stdlib symbols in Native
• KT-77921 False positive EXTENSION_SHADOWED_BY_MEMBER when member has context parameters
• KT-76767 AMBIGUOUS_CONTEXT_ARGUMENT should report the name of the context parameter in addition to the type
• KT-77444 K2: False negative "Unchecked cast" with casting from MutableList to MutableList
• KT-63348 K2: FIR2IR should properly pass expected types
• KT-17460 Diagnostics and intention on suspend function that is overriden with non-suspend one.
• KT-77627 K2: consider getting rid of NEW_INFERENCE_ERROR
• KT-75833 K2: Extra [ANNOTATION_ARGUMENT_MUST_BE_CONST] when passing regex-like strings as annotation arguments
• KT-77547 Native: add a check that the logic looking for stdlib-related bitcode is not used when compiling sources to a klib
• KT-77206 Remove PARAMETER_NAME_CHANGED_ON_OVERRIDE suppression in KMP lexers
• KT-77679 Update syntax-api dependency in KMP Kotlin parser
• KT-77705 K2: Consuming data class compiled with kotlin 1.0.5 breaks the K2 compiler
• KT-77563 False-positive smart cast with captured local in init block causes NPE
• KT-77696 ISE "couldn't find inline method" on kotlin/Result compiled by old Kotlin version
• KT-76931 K2: Annotation on do-while expression captures variables from inside the loop
• KT-77183 Metadata: remove multi-field value class representation
• KT-77678 Apply found optimization to Kotlin KMP parser
• KT-60127 K2: Support scripts with LightTree-based raw FIR building
• KT-77656 K/N: fix the super type for local delegated properties
• KT-75907 Inference/PCLA: consider storing semi-fixed variables in inference session
• KT-77144 Implement KMP Kotlin parser
• KT-77352 Implement KMP Expression parser
• KT-76984 SYNCHRONIZED_BLOCK_ON_JAVA_VALUE_BASED_CLASS isn't reported for primitive wrapper classes instantiated within the scope
• KT-67471 K2: "Unresolved reference" on incorrect term of FQ name
• KT-77269 [K/N] external calls checker crashes when used with caches
• KT-74133 FIR: use EmptyDeprecationsPerUseSite consistently in symbols
• KT-77100 java.lang.Void type is not ignorable
• KT-77491 K2: No SUPERTYPE_IS_EXTENSION_FUNCTION_TYPE when using typealias
• KT-77490 Report error on contextual function type in supertype
• KT-77431 Functional type with a context is allowed as an upper-bound
• KT-77432 Context isn't passed properly when functional type with a context is used as a type argument
• KT-77417 There is no TYPE_VARIANCE_CONFLICT_ERROR when 'out' type is used in context
• KT-62631 Improve expect-actual "checking" incompatibilities reporting
• KT-77481 Support ExpectRefinement feature in HMPP compilation scheme
• KT-77268 Make sure that -Xreturn-value-checker also enables -XX:UnnamedLocalVariables
• KT-65719 K1/K2: Nullness defaults from subclass unsoundly applied to method in superclass
• KT-53836 In type-parameter declarations, recognize JSpecify annotations only on bounds
• KT-73658 JSpecify [@NonNull](https://github.com/NonNull) annotation on type-parameter bound prevents type-variable usages from being platform types
• KT-77000 Leave ForbidInferOfInvisibleTypeAsReifiedOrVararg as a warning
• KT-74084 K2: False negative [NO_ELSE_IN_WHEN]
• KT-77451 FirLazyResolveContractViolationException for test with overridden delegate
• KT-77257 Report compilation error when in generated JVM bytecode there is a need for CHECKCAST of the conditional expression to the inaccessible interface
• KT-77256 Report compilation error when in generated JVM bytecode there is a need for CHECKCAST of the functional call result to the inaccessible interface
• KT-76356 K2 evaluation fails on evaluating inline methods if there is an inline with AutoCloseable
• KT-73786 Evaluator: cannot evaluate inline methods with reified parameter
• KT-77204 Native: XCode strip command causes flaky tests
• KT-77351 Implement KMP KDoc parser
• KT-76597 False negative opt-in required on delegated constructor call
• KT-76667 Mark the class implementation of interface function with ACC_BRIDGE in the class file
• KT-77181 K2: a nested typealias annotation observes member declarations of the outer class
• KT-77180 K2: Wrong scope for annotation arguments in the constructor header
• KT-77287 Try enforcing source != null when origin == Source
• KT-76135 K2: drop pre-1.8 language features from compiler code
• KT-77231 Reflection: CCE on resuming coroutine after callSuspend if result is a generic inline class substituted with primitive
• KT-77031 Investigate the actual need of deduplicating provider in HMPP compilation scheme
• KT-77050 Implement KMP KDoc lexer
• KT-77048 Implement KMP Kotlin lexer
• KT-77044 Consolidate, refine and update jFlex dependency
• KT-77252 It is impossible to declare an unnamed variable in a script
• KT-58137 K2: ISE "Usage of default value argument for this annotation is not yet possible" when instantiating Kotlin annotation with default parameter from another module
• KT-77140 Protect ConstraintSystemCompletionMode.UNTIL_FIRST_LAMBDA with opt-in
• KT-75695 Bogus "Assigned value is never read" warning for prefix ++ operator
• KT-52706 Bad signature for generic value classes with substituted type parameter
• KT-77149 IllegalArgumentException: source must not be null
• KT-76806 K2: AIOOBE in FirEqualityCompatibilityChecker
• KT-72391 KJS: (a * b).toDouble_ygsx0s_k$ is not a function
• KT-76950 K2: "IllegalArgumentException: Inline class types should have the same representation: Lkotlin/UByte; != B" with nullable UByte
• KT-64731 K2: Annotation on inline function or inside inline function is hit by debugger
• KT-76043 Native: NotImplementedError: Generation of stubs for class org.jetbrains.kotlin.ir.symbols.impl.IrFieldSymbolImpl is not supported yet
• KT-77126 Transitive dependency mismatch between Kotlin Gradle Plugin and Scripting dependencies
• KT-65440 K2: Mark all potential implementations of List.getFirst()/getLast() as deprecated independently of JDK
• KT-72831 ANNOTATION_USED_AS_ANNOTATION_ARGUMENT missing in some cases in K2
• KT-73707 Remove dependency on ":compiler:backend.jvm" from Native
• KT-75499 CheckerContext#{containingDeclaration, containingFile} in checkers should return symbols
• KT-76548 False positive TYPE_MISMATCH when resolving an expression with the expected type from the upper bound
• KT-76142 K2: [@RequiresOptIn](https://github.com/RequiresOptIn) warning does not display the custom message when using concatenated strings.
• KT-68699 Kotlin Debugger: UPAE “lateinit property parent has not been initialized” on trying evaluate enumValues(), enumEntries() from inlined function with reified parameter
• KT-63267 K2: incorrect line numbers after smart cast of an extension receiver
• KT-71309 Kotlin Debugger: UnsupportedOperationException on calling method with reified type parameter
• KT-74912 K2: Investigate irrelevant ARGUMENT_TYPE_MISMATCH on top-level lambdas
• KT-74569 K2: Linenumber of annotation is present in constructor's LVT
• KT-74657 K2: Linenumber for annotation on local variable is present in LVT
• KT-74570 K2: Linenumber for annotation on property is present in LVT
• KT-76749 NONE_APPLICABLE message is unreadable for stdlib context function
• KT-74932 Investigate false-negative ARGUMENT_TYPE_MISMATCH on a nested anonymous function
• KT-74545 Redundant TYPE_MISMATCH in variable initializer with call
• KT-76774 K2: Simplify ResolutionMode.WithExpectedType contracts
• KT-76689 Unnamed local variable with type and without initializer is allowed
• KT-76746 ClassCastException: class org.jetbrains.kotlin.fir.types.impl.FirUserTypeRefImpl cannot be cast to class
• KT-76754 K2: Compiler doesn't check annotations on array literals (as annotation arguments)
• KT-76674 The function isn't called from unnamed local variable initializer
• KT-73348 AssertionError from isCompiledToJvmDefault on super call of suspend function with composable function parameter
• KT-73527 Prohibit (via a deprecation warning) accessing nested class through generic outer class
• KT-59886 K2: Disappeared ERROR_IN_CONTRACT_DESCRIPTION
• KT-57949 FIR: SignatureEnhancement: mutation of java enum entry
• KT-57911 K2: Contracts are not inherited by substitution overrides
• KT-47398 'null' EnhancedNullability value in String-based 'when' might produce different behavior depending on whether 'when' is "optimized" or not

Compose compiler

Fixes

• b/394891628 Allow specifying target version of Compose runtime
• b/424454512 Recreate FirApplierInferencer for each check
• b/417406922 Restrict references to [@Composable](https://github.com/Composable) properties
• b/282135108, b/349866442 [Compose] Enable applier checking when using FIR
• b/408492167 Emit parameter names in Compose source information
• b/307592552 Add BigInteger and BigDecimal to the list of known stable classes
• b/414547195 Unwrap type casts when inferring [@Composable](https://github.com/Composable) call arguments

IR. Inlining

Fixes

• KT-76425 Do not store signatures of preprocessed inline functions in KLIBs
• KT-76763 [Inliner] Don't use attributeOwnerId to pass info from Inliner to non-JVM backends
• KT-72464 [Native][JS][Wasm] Non-local return through suspend conversion breaks the IR inliner
• KT-77102 [Inliner] Expression uses unlinked type parameter symbol
• KT-77079 IR: Report warnings on exposure of references to invisible declarations in inline functions
• KT-69797 [references] Accessors for private function/constructor/property references are not generated
• KT-76454 Investigate erasure of class type parameters during inliner
• KT-72593 [K/N] Add NativeIrInliningFacade to CrossCompilationIdentityTest
• KT-70969 IR Inliner: Ensure that common prefix at 1st phase does not affect KLIB signatures
• KT-75937 [IR Inliner] Umbrella for failing tests due to public inliner
• KT-77295 Improve Diagnostic Message Formatting for Private API Exposure in Inline Functions
• KT-77047 Ir Ininler: crash on fake override in private class from more visible class
• KT-77336 [references] Synthetic accessor test for private top-level function accessed via reference fails with No function found for symbol
• KT-76761 [Inliner] non-JVM IR Inliner incorrectly uses K/JVM-specific code
• KT-76712 [Inliner] No function found for symbol '/|?'
• KT-76711 [Inliner] Reference to function 'privateMethod' can not be evaluated

IR. Tree

• KT-76813 IR validator: not all symbols/references are visited

JVM. Reflection

• KT-74529 Context parameters support in reflection
• KT-52170 Reflection: typeOf<Array> gives classifier LongArray

JavaScript

New Features

• KT-70486 K/JS: exported exception types should extend Error
• KT-19016 Define accessors as enumerable

Fixes

• KT-55256 KJS: non-exported subclass with a no-parameter function overload doesn't compile
• KT-76034 passProcessArgvToMainFunction contains the node path and script path
• KT-78169 KJS: [NON_EXPORTABLE_TYPE] with @JsExport class if @JsStatic companion method returns an out type
• KT-70295 KLIB stdlib: Unify intrinsics for boxing captured variables in lambdas across non-JVM backends
• KT-76093 Support new callable reference nodes in partial linkage in Kotlin/JS
• KT-77320 KJS: Big.js times() is compiled to multiply (*) operator
• KT-77430 K/JS: Remove sharedBox* intrinsics from the standard library
• KT-69297 Deprecate referencing inlineable lambdas in js() calls
• KT-73267 KJS: IC: "FileNotFoundException": Build failures with Kotlin 2.1-RC and RC2
• KT-76912 KJS: [@JsStatic](https://github.com/JsStatic) can't be used for companion objects implementing external interfaces
• KT-77242 Kotlin/JS & Kotlin/Wasm backends: Artificially apply reverse topo-order after IR linkage
• KT-77649 KJS: es-arrow-functions requires explicit opt-in when target is ES2015
• KT-77372 KJS: NullPointerException at JsIntrinsics$JsReflectionSymbols
• KT-77620 Fix failing IC tests on Windows
• KT-77190 Migrate JS diagnostic tests to the new CLI-based test facades (1st phase only)
• KT-77371 [K/N][K/JS][K/Wasm] Unify visibility rules for generated default argument stubs
• KT-77148 KJS: "Uncaught TypeError: (intermediate value).l(...).m is not a function" during production build run
• KT-77193 Migrate JS irText tests to the new CLI-based test facades (1st phase only)
• KT-77192 Migrate JS ABI reader tests to the new CLI-based test facades (1st phase only)
• KT-77187 Migrate JS box tests to the new CLI-based test facades (1st phase only)
• KT-77027 Migrate 1st phase facades to the phased CLI infrastructure in JS tests
• KT-76027 KJS: "ReferenceError: entries is not defined": Accessing entries of an enum arbitrarily fails with println()
• KT-76232 Suspend contextual function with extension receiver results in wrong values at runtime in JS

Klibs

• KT-75980 [Klib] Reduce serialized size of IrFileEntries for sparse usage of another source files
• KT-75766 PL: Error on building fake override with multiple overridden members with unbound symbols in return type
• KT-75757 PL: Error on building fake overrides with unbound symbols in value parameters
• KT-76827 KLIB cross-compilation tests: Don't use IR hashes and metadata hashes in test data
• KT-76266 Move trigger of :tools:binary-compatibility-validator:check to native/native.tests/klib-ir-inliner
• KT-74815 KLIB resolver can't consume metadata klibs between source sets when abi_versions diverge
• KT-76725 KLIB ABI export in older version: Restore legacy directories
• KT-76471 Partial linkage: add an attribute if a class is invalid

Language Design

• KT-32993 Contract to specify that a function parameter is always true inside lambda
• KT-8889 Contracts: if a given function parameter is not null, the result is not null

Libraries

• KT-76389 Provide update functions for common atomics
• KT-34132 Contract for ClosedRange.contains(T?) operator
• KT-78242 Move IrLinkageError to the common non-JVM part of the standard library
• KT-73853 Provide vararg constructors for Atomic Arrays
• KT-76773 stdlib: contextOf's type argument can be inferred via contextOf's context argument
• KT-67819 Document collection interfaces contracts

Native

• KT-74662 Consider providing a way to enable stack canaries for Kotlin/Native binaries
• KT-76178 LLVM Update: symbol '__ZnwmSt19__type_descriptor_t' missing
• KT-77378 [macos] Loading libraries with non resolved paths runs XProtectService
• KT-61549 Kotlin/Native: remove kotlin-native/Interop/JsRuntime
• KT-76563 LLVM Update: numerous "was built for newer 'macOS' version" warnings

Native. C and ObjC Import

• KT-71400 Fix disabled -fmodules testing for stdarg.h

Native. ObjC Export

• KT-76974 Include conflicting element in objc export warnings
• KT-78034 ObjCExport: primitive type extension translated as static method
• KT-77781 ObjCExport: support [@ObjCName](https://github.com/ObjCName) for function parameters and receiver parameters
• KT-77592 KMP plugin uses incorrect Swift name from ObjCName annotation
• KT-77625 ObjCExport: ObjCName annotation adds kotlin name swift_name
• KT-77484 KotlinConf app: Invalid identifiers in ObjCHeader.render
• KT-77500 IllegalStateException during generating ObjC header stubs
• KT-76338 Native, ObjCExport: Replace name mangling of special method families

Native. Runtime. Memory

• KT-63143 Kotlin/Native: execute Cleaners on the finalizer thread

Native. Swift Export

• KT-77650 Swift export execution tests fail with caches enabled
• KT-77634 K/N: swift export tests started failing after hyper-existentials
• KT-77290 Transitive Export on swift export can duplicate declarations

Tools. CLI

• KT-77030 Implement setup of HMPP sessions for KLib-based compilers
• KT-75812 Basic DSL for compiler arguments representation
• KT-76828 Warning doesn't exist error with -Xwarning-level when the source file has no code
• KT-76957 Incorrect error message when severity is set with -Xsuppress-warning and -Xwarning-level for the same diagnostic
• KT-76111 kotlinc warns about org.fusesource.jansi.internal.JansiLoader call to System.load
• KT-76447 Remove -Xjps compiler argument

Tools. Compiler Plugin API

• KT-77157 Cannot create a symbol pointer for local class generated by FirFunctionCallRefinementExtension

Tools. Compiler Plugins

• KT-75876 PowerAssert: don't display results for assertion operator
• KT-75514 [JS][Native] Add IrPreSerializationLoweringFacade to Atomicfu test runners
• KT-77719 Remove suppress INVISIBLE_REFERENCE from DataFrame plugin
• KT-77691 Kotlin DataFrame plugin: IR and FIR anonymous functions have inconsistent receivers
• KT-77339 Update kotlin dataframe dependency to 1.0.0-dev-6925
• KT-77455 kotlin-dataframe plugin throws NoClassDefFoundError in IDE
• KT-77437 Kotlin DataFrame: Add configuration key to disable top level properties generator
• KT-74366 Delete kotlin-android-extensions compiler plugin
• KT-73364 Migrate atomicfu sources to new IR parameter API

Tools. Compiler plugins. Serialization

• KT-73365 Migrate kotlinx-serialization sources to new IR parameter API

Tools. Gradle

• KT-77546 Implement basic support for HMPP compilation scheme support in KGP
• KT-77107 Introduce Kotlin ecosystem plugin
• KT-63383 Add compiler performance metrics to Native build reports
• KT-75921 Make Swift Export available by default
• KT-67291 Enable Project Isolation AND/OR Configuration Cache mode for Gradle Integration tests
• KT-77785 Add -fmodules option to CocoaPod dependency by default
• KT-76353 Handle migration to stable -jvm-default in KGP: replace deprecated option and suppress warnings
• KT-77163 Migrate Swift Export IT to injections
• KT-76740 Use Problems API for warning introduced in KT-75808

Tools. Gradle. Compiler plugins

• KT-66728 Deprecate kapt.use.k2 property

Tools. Gradle. JS

• KT-77073 generateTypeScriptDefinitions() does not add generated .d.ts file to package.json automatically

Tools. Gradle. Multiplatform

• KT-77414 KMP dependencies in detached source sets cause IDE resolution to write error logs: "kotlin-project-structure-metadata.json (No such file or directory)"
• KT-76200 TestModuleProperties.productionModuleName for JVM module isn't present with 2.1.20-RC

Tools. Gradle. Native

• KT-68256 Reduce commonizer max heap size to default 3g and allow users to configure it
• KT-77977 "Unknown hardware platform: riscv64" on JVM project build

Tools. Incremental Compile

• KT-60653 IC does not handle changes in inline functions objects/lambdas correctly
• KT-69075 Incremental compilation: smartcast is impossible on field with [@JvmName](https://github.com/JvmName)

Tools. JPS

• KT-75460 Adding [@PurelyImplements](https://github.com/PurelyImplements) annotation to a List does not cause incremental recompile of affected files
• KT-50594 Fix org.jetbrains.kotlin.arguments.CompilerArgumentsContentProspectorTest

Tools. Kapt

• KT-77853 K2 KAPT: backend internal error: exception during IR fake override builder
• KT-73322 Migrate FirKaptAnalysisHandlerExtension compilation pipeline to the phased structure

Tools. Maven. Compiler plugins

• KT-77511 Add maven plugin for Kotlin DataFrame plugin

Tools. REPL

• KT-77470 [K2 Repl] Lazy Properties crash code generation

Tools. Scripts

• KT-78378 "Explain" feature of the kotlin script fails on hidden variables

Tools. Wasm

• KT-75714 Wasm: Move tooling NPM dependencies outside user project
• KT-76838 K/Wasm: No possible to set downloadBaseUrl to null for D8 and Binaryen