1.8.0-Beta

Android

KT-53013 Increase AGP compile version in KGP to 4.1.3
KT-53709 MPP, Android SSL2: Conflicting warnings for androidTest/kotlin source set folder

Backend. Native. Debug

KT-53561 Invalid LLVM module: "inlinable function call in a function with debug info must have a !dbg location"

Compiler

New Features

KT-53916 Support Xcode 14 and new Objective-C frameworks in Kotlin/Native compiler
KT-54460 Implementation of non-local break and continue
KT-32208 Generate method annotations into bytecode for suspend lambdas (on invokeSuspend)
KT-53438 Introduce a way to get SourceDebugExtension attribute value via JVMTI for profiler and coverage

Performance Improvements

KT-53347 Get rid of excess allocations in parser
KT-53689 JVM: Optimize equality on class literals

Fixes

KT-52974 "IllegalStateException: Symbol with IrSimpleFunctionSymbolImpl is unbound" compiling native targets of MPP project
KT-48678 Coroutine debugger: disable "was optimised out" compiler feature
KT-54745 Restore KtToken constructors without tokenId parameter to preserve back compatibility
KT-54650 Binary incompatible ABI change in Kotlin 1.7.20
KT-52786 Frontend / K2: IndexOutOfBoundsException when opting in to K2
KT-54004 Builder type inference does not work correctly with variable assignment and breaks run-time
KT-54581 JVM: "VerifyError: Bad type on operand stack" with generic inline function and when inside try-catch block
KT-52913 JVM / IR: "IllegalArgumentException: Inline class types should have the same representation" when trying to down cast cast a value class
KT-54600 NPE on passing nullable Kotlin lambda as Java's generic SAM interface with super type bound
KT-54463 Delegating to a field with a platform type causes java.lang.NoSuchFieldError: value$delegate
KT-54509 Ir Interpreter: unable to evaluate string concatenation with "this" as argument
KT-54393 Change in behavior from 1.7.10 to 1.7.20 for java field override.
KT-54615 JVM: Internal error in file lowering: java.lang.AssertionError: Error occurred while optimizing an expression
KT-53146 JVM IR: unnecessary checkcast of null leads to NoClassDefFoundError if the type isn't available at runtime
KT-51868 JVM / IR: Inconsistent behaviour between lambda expression and SAM interface conversion for the same interface
KT-53947 IllegalStateException: No mapping for symbol: VALUE_PARAMETER INSTANCE_RECEIVER
KT-53712 Add mode to prevent generating JVM 1.8+ annotation targets (TYPE_USE, TYPE_PARAMETER)
KT-48532 Remove old JVM backend
KT-35187 NullPointerException on compiling suspend inline fun with typealias to suspend function type
KT-54275 K2: "IllegalArgumentException: KtParameter is not a subtype of class KtAnnotationEntry for factory REPEATED_ANNOTATION"
KT-47475 "IncompatibleClassChangeError: disagree on InnerClasses attribute": cross-module inlined WhenMappings has mismatched InnerClasses
KT-53197 K2: 'init' hides member of supertype 'UIComponent' and needs 'override' modifier
KT-53867 K2: @JvmRecord does not compile to a java record
KT-53964 K2 is unable to work with Java records
KT-53349 K2: TYPE_MISMATCH caused by non-local return
KT-54100 "Type variable TypeVariable(P) should not be fixed" crash in code with errors
KT-49017 Forbid usages of super or super if in fact it accesses an abstract member
KT-54192 Warn about unsupported feature on generic inline class parameters
KT-53723 Friend modules aren't getting passed to cache build during box tests
KT-53873 K2: Duplicated diagnostics reported from user type ref checkers
KT-50909 "VerifyError: Bad type on operand stack" caused by smartcasting for nullable inline class property in class
KT-48031 "IllegalStateException: Type variable TypeVariable(T) should not be fixed!"
KT-54115 Restore Psi2IrTranslator constructor from 1.7.20
KT-53908 K2: Self-referencing generics in Java class causes New Inference Error (IE: class Foo<T extends Foo>)
KT-53193 K2: compile error on project that compiles fine with normal 1.7.10
KT-53953 Forbid usages of super or super if in fact it accesses an abstract member
KT-47473 NI: Missed UPPER_BOUND_VIOLATED diagnostics if use type aliases with type parameters
KT-54049 K2: false positive MANY_IMPL_MEMBER_NOT_IMPLEMENTED
KT-30054 Wrong approximation if nullable anonymous object with implemented interface is used
KT-53751 Postpone IgnoreNullabilityForErasedValueParameters feature
KT-53324 Implement Enum.entries lowering on K/N
KT-44441 K2: report redeclaration error if there is a Java class with the same name as the Kotlin class
KT-53493 K2: val on function parameter counts as just warning
KT-53435 K2: "IllegalArgumentException: class KtValueArgument is not a subtype of class KtExpression for factory ANNOTATION_ARGUMENT_MUST_BE_CONST" if string in nested annotation is concatenated
KT-52927 AssertionError: LambdaKotlinCallArgumentImpl
KT-53922 Make Enum.entries unstable feature to poison binaries
KT-53783 Exception during psi2ir when declaring expect data object
KT-41670 JVM IR: AbstractMethodError when using inheritance for fun interfaces
KT-53178 K2: implement diagnostics for serialization plugin
KT-53465 Unnecessary checkcast to array of reified type is not optimized since Kotlin 1.6.20
KT-52970 Default value constant in companion object works on JVM and JS, but fails on native
KT-27936 Write InnerClasses attribute for all class names used in a class file
KT-53007 JVM: "Bad invokespecial instruction: current class isn't assignable to reference class" when call superclass of outer class method from inner class
KT-53261 Evaluate effect from inline for primitive types
KT-39492 Kotlin.Metadata's packageName field cannot be an empty string
KT-53664 Ir Interpreter: unable to evaluate name of function reference marked with JvmStatic from another module
KT-52478 [Native] Partial linkage: Building native binary from cached KLIBs fails if one library depends on removed nested callable member from another one
KT-53667 Compiler crashes on attempt to alloc a string on the stack in new MM
KT-48822 CompilationException: Back-end (JVM) Internal error: Failed to generate expression: KtProperty - ConcurrentModificationException
KT-50281 IllegalStateException: unsupported call of reified inlined function
KT-53480 Internal error in file lowering: java.lang.ClassNotFoundException: com.android.systemui.R$string
KT-50083 Different error messages in android and JVM (Intrinsics.checkNotNullParameter).
KT-53270 K1: implement synthetic Enum.entries property
KT-41017 FIR: should we support smartcast after null check
KT-52823 Cannot access class Thread.State after upgrading to 1.7 from 1.6.1 using -Xjdk-release=1.8
KT-53257 FIR: Improper context receiver argument is chosen when there are two extension receiver candidates
KT-53090 Anonymous function and extension function literals are generated as classes even with -Xlambdas=indy
KT-53208 K2: Cannot get annotation for default interface method parameter when compiled with -Xuse-k2
KT-53184 K2: NoSuchMethodError on KProperty1.get() referenced via nullable typealias
KT-53198 K2: Return type mismatch: expected kotlin/Unit, actual kotlin/Unit?
KT-53100 Optimization needed: (CONSTANT_PRIMITIVE(x: T?)) => x
KT-49875 [FIR] Support infering PRIVATE_TO_THIS visibility
KT-53024 Refactor FIR renderer to composable architecture
KT-29168 Prohibit upper bounds violation with generic typealias using not all type parameters as arguments for underlying type in supertypes
KT-53148 K1: introduce warning for inline virtual member in enum
KT-53041 NPE in Kotlin 1.7.0 when using RxJava Maybe.doOnEvent with anonymous parameters
KT-49847 Devirtualization fails to eliminate boxing in function reference context
KT-52875 Extension function literal creation with -Xlambdas=indy fails with incorrect arguments
KT-53072 INVALID_IF_AS_EXPRESSION error isn't shown in the IDE (LV 1.8)
KT-52985 Native: a function with type T? returned a kotlin.Unit instead of null
KT-52020 FIR warning message includes internal rendering
KT-50835 Inline functions with suspend lambdas break the tail-call optimization
KT-54802 "VerifyError: Bad type on operand stack" for inline functions on arrays

IDE

KT-48773 Investigate the possibility of removing dependency on old JVM backend in light classes
KT-51101 FIR IDE: Exception on "Show Type Info" action
KT-51656 FIR IDE: ProgressCancelled exception is masked in the compiler during resolve
KT-51315 FIR IDE: move out base modules from fe10 plugin to reuse in k2 plugin
KT-53097 Extract common part of light classes to another module

IDE. Debugger

KT-51755 Compilation exception with scripting compilation during debug session

IDE. Gradle Integration

KT-53514 HMPP: False positive for None of the following functions can be called with the arguments supplied. with Enum in common module
KT-48135 In the IDE import, reuse dependency granular source set KLIBs across multi-project build to avoid duplicate external libraries
KT-51583 Gradle 7.4+ | SamplesVariantRule interference: Could not resolve all files for configuration ':kotlinKlibCommonizerClasspath'

IDE. Inspections and Intentions

KT-49643 Intentions: "Implement members" fails when base type function declaration uses unresolved generic types

IDE. Navigation

KT-51314 FIR IDE: show Kotlin declarations in search symbol

IDE. Script

KT-54325 .settings.gradle.kts and .init.gradle.kts are reported as standalone scripts

IDE. Tests Support

KT-50269 FIR IDE: Allow running tests via gutter

JavaScript

Fixes

KT-53931 KJS / Gradle: Regression with 1.7.20-RC: ReferenceError: println is not defined
KT-54520 KJS / IR Allow IdSignature clashes
KT-54686 KJS / IR: Incorrect generation of signatures when one of argument is nested class
KT-54479 KJS / IR + IC: Adding or removing companion fields leads java.lang.IllegalStateException in the compiler IC infrastructure
KT-54382 KJS / IR: Wrong type check for inheritors of suspend functions
KT-54323 KJS / IR + IC: Intrinsics from stdlib may lose their dependencies in incremental rebuild
KT-53361 KJS / IR: No debug info is generated for in-line js code
KT-53321 Implement Enum.entries lowering on JS/IR
KT-53112 KJS IR turn on IC infra by default
KT-50503 Kotlin/JS: IR + IC: compileTestDevelopmentExecutableKotlinJs fails with ISE: "Could not find library" after removing module dependency
KT-54120 JS IR + IC: pointless invalidation of dependent code after modifying companions
KT-54011 JS IR + IC: EnumEntries don't work well when IC is enabled
KT-54010 JS IR + IC: Force IC cache invalidation after updating language version or features
KT-53672 KJS / IR: "IndexOutOfBoundsException: Index 0 out of bounds for length 0" caused by function reference to extension function of reified type variable
KT-43455 KJS: IR. Incremental compilation problem with unbound symbols
KT-53539 KJS: Exported class inherited non-exported class shows warning
KT-53443 KJS/IR: NullPointerException caused by anonymous objects inside lambdas
KT-52795 K/JS and K/Native IR-validation/compilation errors for a valid kotlin code
KT-52805 KJS/IR: Invalid call of inline function in also block
KT-51151 KJS / IR: Wrong overloaded generic method with receiver is called
KT-52830 KJS/IR: Sourcemap disabling doesn't work
KT-52968 KJS / IR: Buggy generation of overridden methods
KT-53063 KJS / IR + IC: undefined cross module reference for implemented interface functions
KT-51099 KJS / IR + IC: Cache invalidation doesn't check generic class variance annotations (in, out)
KT-51090 KJS / IR + IC: Cache invalidation doesn't check suspend qualifier
KT-51088 KJS / IR + IC: Cache invalidation doesn't check class qualifiers (data, inline)
KT-51083 KJS / IR + IC: Cache invalidation doesn't check inline function which was non inline initially
KT-51896 KJS / IR + IC: Cache invalidation doesn't trigger rebuild for fake overridden inline functions

Language Design

KT-41886 Ability to require opt-in for interface implementation, but not for usage
KT-34943 OVERLOAD_RESOLUTION_AMBIGUITY inconsistent with the equivalent Java code
KT-49110 Prohibit access to members of companion of enum class from initializers of entries of this enum

Libraries

New Features

KT-21007 Provide Kotlin OSGI Bundle with extensions for JRE8 (and JRE7)
KT-54082 Comparable and subtractible TimeMarks
KT-50484 Extensions for java.util.Optional in stdlib
KT-52928 Provide copyToRecursively and deleteRecursively extension functions for java.nio.file.Path
KT-52932 Open-ended ranges in the standard library
KT-49425 Update OptIn documentation to reflect latest design changes
KT-54005 Allow calling declaringJavaClass on Enum
KT-52933 rangeUntil members in built-in types

Performance Improvements

KT-53508 Cache typeOf-related KType instances when kotlin-reflect is used

Fixes

KT-51907 Switch JVM target of the standard libraries to 1.8
KT-53277 Stabilize experimental API for 1.8
KT-53864 Review deprecations in stdlib for 1.8
KT-47707 Remove the system property and the brittle contains optimization code itself
KT-52336 Different behavior on JVM and Native in stringBuilder.append(charArray, 0, 1)
KT-53927 Remove deprecation from ConcurrentModificationException constructors
KT-53134 stdlib > object Charsets > not thread safe lazy initialization
KT-51063 Gradle project with JPS runner: "JUnitException: Failed to parse version" JUnit runner internal error with JUnit
KT-52908 Native: setUnhandledExceptionHook swallows exceptions

Native

KT-51043 Kotlin Native: ObjC-Interop: kotlin.ClassCastException: null cannot be cast to kotlin.Function2
KT-50786 Native: prohibit suspend calls inside autoreleasepool {}
KT-53346 MPP project with kotlinx-serialization-json:1.4.0-RC is not built
KT-52834 Implement test infrastructure for K2/Native

Native. C Export

KT-36878 Reverse C Interop: incorrect headers generation for primitive unassigned type arrays
KT-53599 [Reverse C Interop] Provide box/unbox API for unsigned primitive types
KT-41904 Kotlin/Native : error: duplicate member for interface and function with the same name
KT-42830 [Reverse C Interop] Add API to get value of boxed primitives
KT-39496 K/N C: optional unsigned types as function parameters crash the compiler
KT-39015 Cannot compile native library with nullable inline class

Native. C and ObjC Import

KT-54738 Cocoapods cinterop: linking platform.CoreGraphics package
KT-54001 Kotlin/Native: support header exclusion in cinterop def files
KT-53151 Native: Custom declarations in .def don't work with modules, only headers

Native. ObjC Export

KT-53680 Obj-C refinement annotations
KT-54119 Native: runtime assertion failed due to missing thread state switch
KT-42641 Don't export generated component* methods from Kotlin data classes to Obj-C header

Native. Platform Libraries

KT-39747 Why is there no WinHttp API in Kotlin/Native's Windows API?

Native. Runtime

KT-49228 Kotlin/Native: Allow to unset unhandled exception hook
KT-27305 Fix FILE macro inside RuntimeCheck and RuntimeAssert

Native. Runtime. Memory

KT-54498 Deprecation message of 'FreezingIsDeprecated' is not really helpful
KT-53182 New memory manager: Unexpected memory usage on IOS

Native. Stdlib

KT-52429 Small Usability Improvements for Worker API

Reflection

KT-54611 KTypeImpl does not take into account class loader from the classifier property
KT-48136 Make Reflection.getOrCreateKotlinPackage use cache when kotlin-reflect is used
KT-50705 Use ClassValue to cache KClass objects in kotlin-reflect
KT-53454 Properly cache the same class's KClass when it's loaded by multiple classloaders in getOrCreateKotlinClass

Specification

KT-53646 Incorporate rangeUntil (..<) operator into specification

Tools. CLI

KT-54116 Add JVM target bytecode version 19
KT-53278 Support values 6 and 8 for -Xjdk-release
KT-46312 CLI: Kotlin runner should use platform class loader to load JDK modules on Java 9+

Tools. Commonizer

KT-54310 Commonizer fails on 1.8.0-dev K/N distributions
KT-48576 [Commonizer] platform.posix.pselect not commonized in Ktor

Tools. Compiler Plugins

KT-46959 Kotlin Lombok: Support generated builders (@builder)
KT-53647 [K2] Unresolved reference compilation error occurs if a field is annotated with @ Singular and has type Iterable<>

Tools. Compiler plugins. Serialization

KT-53157 Recursion detected in a lazy value under LockBasedStorageManager in kotlinx.serialization
KT-49660 kotlinx.serialization: IndexOutOfBoundsException for parameterized sealed class
KT-43910 JS IR: Serialization with base class: "IndexOutOfBoundsException: Index 0 out of bounds for length 0"

Tools. Daemon

KT-52622 Kotlin/JS, Kotlin/Common compilations start Kotlin daemon incompatible with Kotlin/JVM compilation on JDK 8

Tools. Gradle

KT-54703 Stdlib substitution does not work with JPMS modules

New Features

KT-53357 Change single build metrics property
KT-34464 Kotlin build report path not clickable in the IDE

Performance Improvements

KT-52520 Remove usage of reflection from CompilerArgumentsGradleInput
KT-53118 Fully up-to-date builds are slower with Kotlin 1.7.0

Fixes

KT-54136 Duplicated classes cause build failure if a dependency to kotlin-stdlib specified in an android project
KT-51923 Improve usability of errors and warnings by being able to click on them
KT-54439 Project failed to sync Native LaguageSettings to compiler options in afterEvaluate
KT-54399 Undeprecate 'kotlinOptions' DSL
KT-54306 Change the naming of newly added Compiler*Options classes and interfaces
KT-53885 Bump minimal supported Gradle version to 6.8.3
KT-53773 Protect and system properties can contain sensitive data
KT-53732 Add custom values limits for build scan reports
KT-52624 Compatibility with Gradle 7.3 release
KT-51831 Gradle: remove kotlin.compiler.execution.strategy system property
KT-51679 Change deprecation level to error for KotlinCompile setClasspath/getClasspath methods
KT-48843 Add ability to disable Kotlin daemon fallback strategy
KT-53617 KotlinCompilerExecutionStrategy value is ignored by depending modules if configure once for all project modules using allProjects {}
KT-53823 Kotlin Gradle Plugin uses deprecated Gradle API: Provider.forUseAtConfigurationTime()
KT-54142 Increase Kotlin Gradle plugin Gradle target API to 7.5
KT-50161 Android variant filter breaks KotlinCompile cache compatibility
KT-54113 LanguageSettings to KotlinNativeLink.toolOptions sync are executed on the wrong context
KT-54112 Missing target input on KotlinNativeLink task
KT-45879 Documentation: Wrong kotlin languageVersion "1.6 (EXPERIMENTAL)"
KT-54103 Remove JvmTarget.JVM_1_6 from generated Gradle compiler type
KT-50598 MULTIPLE_KOTLIN_PLUGINS_SPECIFIC_PROJECTS_WARNING is only shown on first build
KT-52209 Corrupted cache and non-incremental build if produce caches "in process" and restore then compiling with kotlin daemon
KT-41642 "TaskDependencyResolveException: Could not determine the dependencies" when trying to apply stdlib
KT-53390 Drop usage of -Xjava-source-roots when passing java sources required for Kotlin compilation
KT-38622 Non-incremental compilation because of R.jar with Android Gradle plugin 3.6
KT-53615 Gradle: Fix deprecation warnings in CleanableStoreImpl
KT-38576 AnalysisResult.RetryWithAdditionalRoots crashes during incremental compilation with java classes in classpath
KT-53244 Report from gradle about compiler plugins
KT-45747 Add basic JUnit 5 Kotlin Gradle Plugin Android tests setup
KT-52839 Warn in Gradle log why incremental compilation failed

Tools. Gradle. Cocoapods

KT-54314 Cocoapods: Signing pod dependency for Xcode 14
KT-54060 Xcode 14: disable bitcode embedding for Apple frameworks
KT-53127 Cocoapod plugin ignores pod version
KT-53340 Change default linking type for frameworks registered by cocoapods plugin
KT-53392 Deprecate and delete downloading pod dependencies by direct link
KT-53695 Build of macOS application fails if a framework is integrated via Cocoapods plugin
KT-53174 CocoaPods: Synthetic Podfile does not specify platform

Tools. Gradle. JS

KT-53374 KJS / Gradle: Implement IDEA sync detection logic via ValueSource to improve configuration cache support
KT-53788 KJS / Gradle: Disable Gradle build cache for KotlinJsDce when development mode is enabled
KT-53614 Kotlin/JS upgrade npm dependencies
KT-52950 KJS: Report if yarn.lock was updated during built
KT-53367 KJS: Migrate cssSupport API
KT-45789 KJS / IR: Transitive NPM dependencies are not included in PublicPackageJsonTask output

Tools. Gradle. Multiplatform

New Features

KT-53396 Support 'implementation platform()' by gradle kotlin mpp plugin for JVM target
KT-40489 MPP / Gradle: support BOM (enforcedPlatform) artifacts in source set dependencies DSL

Fixes

KT-27292 MPP: jvm { withJava() }: Gradle build: Java source under Kotlin root is resolved while building, but does not produce output class files
KT-34650 Naming clash in MPP+Android: androidTest vs androidAndroidTest
KT-54387 Remove MPP alpha stability warning
KT-31468 Targets disambiguation doesn't work if a depending multiplatform module uses withJava() mode
KT-35916 Gradle MPP plugin: Configurations for a main compilation and its default source set have different naming
KT-54090 Take an Apple test device from the device list
KT-53256 Implement K/N compiler downloading for KPM
KT-45412 KotlinCompilation: Make sure .kotlinSourceSets and .allKotlinSourceSets include the default source set
KT-54071 MPP/AGP compatibility: Bump maxSupportedVersion to 7.3.0

Tools. Gradle. Native

KT-53191 Native cinterop sync problem with gradle
KT-54583 watchosDeviceArm64 target shouldn't register test tasks
KT-53107 Add arm64 support for watchOS targets (Xcode 14)
KT-52303 Gradle / Native: Build tasks ignore project.buildDir
KT-47355 Support macos target for FatFramework task
KT-53339 MPP / CocoaPods: The static framework fails to install on a real iOS device
KT-31573 Missing description for Native Gradle tasks
KT-53131 Gradle Sync: "NoSuchElementException: Array contains no element matching the predicate" with CocoaPods
KT-53686 Task assembleReleaseXCFramework fails with "error: the path does not point to a valid framework" if project name contains a dash

Tools. Incremental Compile

KT-53266 Increment Compilation: "IllegalStateException: The following LookupSymbols are not yet converted to ProgramSymbols" when changing companion object constant field
KT-53871 New IC: "IllegalStateException: The following LookupSymbols are not yet converted to ProgramSymbols" when changing an inline property accessor
KT-53231 New IC reports build failures for missing classpath snapshots
KT-19804 Relocatable IC caches
KT-52946 CompileKotlinJs task is executed non-incrementally if there were changes made to the dependant module

KT-53266 Increment Compilation: "IllegalStateException: The following LookupSymbols are not yet converted to ProgramSymbols" when changing companion object constant field

KT-53871 New IC: "IllegalStateException: The following LookupSymbols are not yet converted to ProgramSymbols" when changing an inline property accessor

KT-53231 New IC reports build failures for missing classpath snapshots

KT-19804 Relocatable IC caches

KT-52946 CompileKotlinJs task is executed non-incrementally if there were changes made to the dependant module

KT-53266 Increment Compilation: "IllegalStateException: The following LookupSymbols are not yet converted to ProgramSymbols" when changing companion object constant field
KT-53871 New IC: "IllegalStateException: The following LookupSymbols are not yet converted to ProgramSymbols" when changing an inline property accessor
KT-53231 New IC reports build failures for missing classpath snapshots
KT-19804 Relocatable IC caches
KT-52946 CompileKotlinJs task is executed non-incrementally if there were changes made to the dependant module

Tools. JPS

KT-45474 False positive NO_ELSE_IN_WHEN on sealed class with incremental compilation
KT-54228 Switching abstract to sealed classes causes incremental issue
KT-38483 JPS: Stopping compilation causes IDE CompilationCanceledException
KT-50310 False positive NO_ELSE_IN_WHEN on incremental build when adding sealed classes
KT-48813 Move cache version to compiler

Tools. Kapt

KT-54187 JVM IR + kapt: incorrect modifier final is generated for nested enum in interface
KT-48827 Remove 'kapt.use.worker.api' property
KT-52761 Kotlin 1.7.0 breaks kapt processing for protobuf generated java sources

Tools. Scripts

KT-54355 Scripts: Internal compiler error (languageVersion=1.9)
KT-53009 Scripting: NDFDE “Descriptor wasn't found for declaration SCRIPT” on using script definition with kotlin from master

Kotlin

Kotlin Logo

External resources

Project members

Technical information