ChangeLog.md

CHANGELOG

1.5.30

Backend. Native. Debug

• KT-47405 Incorrect path from inlined method in stacktrace on iOS-simulator ARM64
• KT-47408 Incorrect line number of inlined method on iOS-simulator ARM64

Compiler

New Features

• KT-44261 Support RxJava 3 nullability annotations
• KT-32443 Experimental declarations should be contagious even when they are not explicitly used
• KT-45844 Forbid using experimental markers on override declarations
• KT-45845 Forbid using experimental markers on getter
• KT-46644 Resolve overrides for IrProperty on deserialization
• KT-46967 Support class type parameters annotations in FIR
• KT-47402 Native: optimize access to object declarations that have only const vals and no init blocks
• KT-47709 Make when statements with enum, sealed, and Boolean subjects exhaustive by default
• KT-47699 Support programmatic creation of class annotations and corresponding feature flag on JVM

Performance Improvements

• KT-45103 Direct invoke optimization
• KT-47785 Compilation time increased when trying to compile AssertJ DB expression in 1.5.21

Fixes

• KT-48361 INTEGER_OPERATOR_RESOLVE_WILL_CHANGE is not reported in some positions
• KT-48180 JVM / IR: AssertionError: "Lambda with offset already exists" caused by calling inline function with default lambda parameter
• KT-47328 JVM / IR: NoSuchFieldError with missing CHECKCAST
• KT-48172 "IllegalStateException: Cannot serialize error type: [ERROR : ]" in 1.5.21 with java kotlin interop
• KT-48230 JVM IR: CCE for multiple receivers case
• KT-48262 "Inconsistent type" with JSpecify @NullMarked
• KT-48167 JVM / IR: If Map#entrySet is implemented in an interface, Kotlin compiler generates incorrect code for its implementation
• KT-47988 JVM / IR: "VerifyError: Bad type on operand stack" when invoking apply with a local method reference
• KT-48163 JVM / IR: "VerifyError: Bad type on operand stack" when throwing result of smartcast
• KT-47833 False positive "Type argument is not within its bounds " with upcasting in 1.5.30-M1
• KT-47830 Some code doesn't compile with unrestricted builder inference
• KT-39883 Deprecate computing constant values if complex boolean expressions in when condition branches and conditions of loops
• KT-47037 Eliminate builder inference restrictions
• KT-46726 IR + BuilderInference: AssertionError: Unbound private symbol on usage of this in a BuilderInference lambda
• KT-43855 Support gradual introduction of new nullability annotations
• KT-43142 FIR: Check UPPER_BOUND_VIOLATED for type alias constructors properly
• KT-45228 Leaking builder inference type variables though callable references
• KT-42270 NI: NEW_INFERENCE_NO_INFORMATION_FOR_PARAMETER for BuilderInference with extension functions
• KT-46029 JVM / IR: "Unbound private symbol: " when trying to save SequenceScope in property
• KT-45258 Wrong CST between types which contain stub type
• KT-45224 Type safety problem through leaking of the builder inference scope
• KT-22852 Report diagnostics on implicit usages of experimental API
• KT-22941 Experimental marker annotation with SOURCE retention is compiled without error
• KT-24993 Inference for buildSequence/yield doesn't work for labeled lambdas
• KT-31728 Incorrect EXPERIMENTAL_OVERRIDE_ERROR for override of experimental function in anonymous object
• KT-33364 Kotlin/Native debugger: execution stops only at next line for breakpoint at when expression without parameter
• KT-42139 NI: NEW_INFERENCE_NO_INFORMATION_FOR_PARAMETER for emptyList / listOf (with no arguments) / emptyMap / mapOf (with no arguments) inside if block inside sequence block
• KT-44241 NI: BuilderInference regression
• KT-44372 FIR: KClass::java cannot be resolved as callable reference
• KT-44547 Native: wrong RTTI when overriding functions with equal signatures but different type arguments
• KT-44571 Segfault on unnecessary int unboxing
• KT-45083 Problem with property reference in builder inference
• KT-45315 Deprecate (V)::a reference resolution to companion in FE 1.0
• KT-46393 AE: "1 trailing arguments were found in Any type" for private function with implicit anonymous return type inside generic class
• KT-46661 FIR: Investigate inference issue with self-types and star projection
• KT-46775 [Native] [IR] Support multiple suspend lambdas as class supertypes
• KT-46836 Error: Invalid LLVM module on inlineClasses external tests
• KT-46838 NullPointerException: Parameter specified as non-null is null in CollectionsKt.joinToString()
• KT-46896 Native IR: NPE when using irBuiltIns.suspendFunction
• KT-46996 FIR: INFERENCE_NO_INFORMATION_FOR_PARAMETER on type aliases with non-trivial expansions
• KT-47034 KtValueArgument.getArgumentExpression could lead to StubBasedPsiElementBase.notBoundInExistingAst
• KT-47052 BuilderInference case with flatMapTo doesn't work properly
• KT-47082 Stub type variable is leaked (reproduces with K/N during deserialization)
• KT-47143 ClassicTypeSystemContext couldn't handle: Captured(*) in Kotlin 1.5.0
• KT-47148 Type mismatch: inferred type is Any? but T? was expected
• KT-47180 Forbid using OptIn markers on local variable, value parameter or field
• KT-47181 Forbid using OptIn markers on types or type parameters
• KT-47183 Segfault on int unboxing
• KT-47208 Backend Internal error: Exception during IR lowering: assert at IrOverridingUtilKt.buildFakeOverrideMember
• KT-47276 Nullability annotations without target are ignored if type enhancement improvements are enabled
• KT-47450 StackOverflowException in psi2ir with many chained binary expressions
• KT-47462 K/N: AssertionError: Unbound private symbol org.jetbrains.kotlin.ir.symbols.impl.IrClassSymbolImpl@6cb748db (NON-PUBLIC API): deserialized class Companion
• KT-47941 "IllegalStateException: Expected some types" on a call with several excepted type constraints
• KT-47854 "IllegalArgumentException: Type is inconsistent" with Android's @Nullable annotation starting in Kotlin 1.5.20
• KT-47899 "AssertionError: Intersection type should not be marked nullable" with 1.5.21
• KT-47846 Stack overflow when handling enhanced recursive type parameter
• KT-47747 Introduce specific error for calls which could be resolved only with unrestricted builder inference
• KT-47739 JVM / IR: NoSuchFieldError with generic sealed classes
• KT-47422 -Xjspecify-annotations: If a class has a @Nullable type-parameter bound, Kotlin should still treat some users' type arguments as platform types
• KT-47437 Type inference failure with raw types under -Xjspecify-annotations=strict
• KT-47396 <?> in @NullMarked code should permit nullable types
• KT-47729 False positive INTEGER_OPERATOR_RESOLVE_WILL_CHANGE warning: "expression will be resolved to Int in future releases"
• KT-47333 Xcode 13: Compilation for iOS simulator fails
• KT-47772 False negative WRONG_ANNOTATION_TARGET on type argument to function call
• KT-47467 JVM / IR: "AssertionError: Annotation class expected: deserialized class Array" caused by java annotation as a parameter of another annotation
• KT-47744 UninitializedPropertyAccessException compiler exception on nested builder inference calls
• KT-47724 Type inference: False positive "Returning type parameter has been inferred to Nothing implicitly"
• KT-47660 JVM / IR: Mockito verification fails when named parameters are ordered differently
• KT-47589 Using RequiresOptIn annotation on constructor property results in error even if the annotation has no VALUE_PARAMETER target

Docs & Examples

• KT-47649 Important note about KJS IR compiler and stdlib compatibility in 1.5.30

IDE

• KT-44643 ISE: Could not generate LightClass for some declared in on initialisation by lazy in a JVM module of a multiplatform project
• KT-47947 Add language version 1.6 to the compiler configuration preferences

IDE. Gradle Integration

• KT-47163 KJS / Gradle: Could not resolve <artifact> despite being resolvable & project buildable

IDE. JS

• KT-46548 KJS: Create an IDE plugin to help with migration to and keeping compatibility with JS IR BE
• KT-47557 KJS: With NPM dependency IDEA import fails when performed before Gradle build

JavaScript

• KT-46204 KJS / IR: Support SuspendFunctionN as super type
• KT-38363 JS IR BE: support IC for lowerings
• KT-41651 JS IR BE: DCE removes render method from react components passed to the kotlinx.react
• KT-46520 KJS / IR: ISE "Can't find name for declaration FUN name:CharArray_init_$Create$" on callable reference to Array constructor
• KT-45738 KJS / IR: Wrong generated code for when statement
• KT-46551 KJS / IR: Add a basic sourcemap generation

Libraries

• KT-47477 Could not resolve kotlin-test during project import in case of multiplatform with only JVM target platform
• KT-47675 Converting Double to Duration may expose inexactness
• KT-47419 Remove method of the MapBuilder iterator throws IOOBE instead of IllegalStateException
• KT-47211 Kotlin Native - AbstractMutableList.addAll (with index) does not throw IndexOutOfBoundsException if elements is empty
• KT-23351 Regex.splitToSequence, CharSequence.splitToSequence(Regex)
• KT-42851 kotlin.time.Duration toString() shows wrong result for seconds
• KT-45325 Parsing Duration from String
• KT-34021 Regex.matchAt / matchesAt

Native

• KT-35001 warning: linking module flags 'SDK Version': IDs have conflicting values ('[2 x i32] [i32 13, i32 2]'
• KT-43475 Kotlin/Native compiler: Including a static C library increased cross-compilation time from 3.5minutes to 1 hour 40 minutes
• KT-44148 Escape analysis failure: Heap space out of memory

Native. C and ObjC Import

• KT-46711 platform.windows._LARGE_INTEGER cannot be passed by value

Native. ObjC Export

• KT-43780 Improve Swift/Obj-C ergonomics for object and companion object
• KT-46431 KMP accessing a property of an anonymous inner class that inherits from an abstract class causes a 'NSGenericException', reason: '[Shared_kobjcc0 ] is abstract' exception.
• KT-47042 Kotlin/Native: Concurrency Interoperability with Objective-C (Swift 5.5)

Native. Stdlib

• KT-47915 Kotlin/Native: Provide access to test cases generated by the compiler

Native. Platforms

• KT-44321 Support Apple Silicon without Rosetta 2

Reflection

• KT-18277 InvalidProtocolBufferException: Stream closed on multithreaded access to built-ins data in reflection
• KT-44977 Reflection: ClassCastException caused by annotations with "AnnotationTarget.TYPE" usage on array attributes access
• KT-47650 KClass::nestedClasses throws ClassCastException for script classes with type aliases

Tools. CLI

• KT-47623 Deprecate -Xuse-experimental
• KT-30778 kotlin-compiler.jar contains shaded but not relocated kotlinx.coroutines
• KT-40979 CLI: Executing "kotlinc.bat" at a root path, errors are not reported with a correct filepath
• KT-40994 CLI: Add documentation for -J argument in kotlinc -help
• KT-46764 CLI: Java record defined in a single file root is not resolved

Tools. Commonizer

• KT-47433 [Commonizer] Commonize functions/properties with TA/Class types in signature
• KT-47691 [Commonizer] Commonize var and val properties
• KT-47434 [Commonizer] Commonize parameterized (type-alias + class) types
• KT-47432 [Commonizer] Commonize (type-alias + class) types used in functions
• KT-45992 [Commonizer] Allow commonization of TypeAlias and Class with same name
• KT-46716 [Commonizer] Analyze leaf source sets with original platform libraries
• KT-46957 [Commonizer] Unresolved classifier: platform/posix/ptrdiff_t for linuxMips32
• KT-47133 Forbid cinterop commonization with hierarchical commonization turned off
• KT-47301 [Commonizer] Associative commonization

Tools. Compiler Plugins

• KT-46723 Kotlin Lombok: JPS: config file is searched in directory relative to compiler daemon
• KT-46739 @SerialInfo NPE with default parameter

Tools. Daemon

• KT-47152 Incremental Compilation with Kotlin compile daemon and JDK 17 fails with IllegalAccessException

Tools. Gradle

New Features

• KT-45757 Add an easier way to explicitly set Kotlin daemon jvm arguments

Fixes

• KT-47940 Kotlin JVM toolchain breaks configuration cache
• KT-46626 kotlin-android plugin with kotlin-dsl: Extension with name 'android' does not exist. Currently registered extension names: [ext, kotlin, kotlinTestRegistry]
• KT-47754 “'compileDebugUnitTestJavaWithJavac' task (current target is 1.8)” during build android project without specified target and with jvmToolchain = JDK 11
• KT-47520 Kotlin and Java target compatibility check produces false positive on using Gradle toolchains
• KT-46978 Duplicate resource errors on gradle 7 with multi-module multiplatform project with withJava
• KT-27687 Empty directories in source set causes gradle cache miss for KotlinCompile task
• KT-47635 Kotlin version conflict on using 'noarg' Gradle plugin
• KT-47636 Kotlin version conflict on using 'sam-with-receiver' Gradle plugin
• KT-47354 Kotlin version conflict on using 'allopen' Gradle plugin
• KT-45202 Kapt crashes with java.io.UTFDataFormatException
• KT-13258 Kotlin compiler doesn't respect Gradle's "sourceCompatibility" and "targetCompatibility"
• KT-43095 Add support for Java Toolchain to the Gradle plugin
• KT-45611 KGP should declare JDK version as input
• KT-47185 Migrate Gradle Integration tests to use cache redirector
• KT-48226 Kotlin toolchain does not set 'jvmTarget' for Kotlin tasks on configuration cache reuse
• KT-44279 Kotlin-Android Gradle Plugin (KGP) should react to application of AGP rather than assume it was applied first
• KT-44041 PersistentEnumeratorBase$CorruptedException: PersistentEnumerator storage corrupted

Tools. Gradle. JS

• KT-47436 KJS / IR: Compiler plugins not provided to link task
• KT-46693 KJS: Update node.js version used inside gradle to latest 14.x
• KT-47559 KJS / Gradle: Run task created using eager API and breaks task configuration avoidance
• KT-47176 KJS: Actualize NPM dependencies
• KT-47154 KJS / Gradle: Compile task reads dependencies metadata from filesystem too long on large projects
• KT-47114 KJS / IR: Could not resolve coroutines-core-js
• KT-43379 KJS / Gradle: On windows, an invalid regex is generated for Webpack ProgressPlugin

Tools. Gradle. Multiplatform

• KT-47210 [Commonizer] Avoid commonization of test source set hierarchy if possible
• KT-46279 [Commonizer] Gradle 7.0 will emit warning for metadata compilation in multimodule builds
• KT-47126 ios() target shortcuts should not include Apple Silicon by default
• KT-38111 Gradle DSL: rename useExperimentalAnnotation function
• KT-47126 ios() target shortcuts should not include Apple Silicon by default
• KT-47612 Task :buildKotlinToolingMetadata is incompatible with Gradle configuration cache
• KT-47611 Task :generateMetadataFileForKotlinMultiplatformPublication is incompatible with Gradle configuration cache

Tools. Gradle. Native

• KT-42023 Kotlin Native Cocoapods plugin fails when Xcode project has custom CONFIGURATION names
• KT-47653 Support multi arch build via embedAndSign task
• KT-47078 Support Apple Silicon in cocoapods gradle plugin
• KT-47077 Support Apple Silicon in embedAndSign task

Tools. Incremental Compile

• KT-27660 JS Incremental compilation fails with java.io.IOException: java.lang.ArrayIndexOutOfBoundsException: Array index out of range: 0
• KT-36865 IC: "ArrayIndexOutOfBoundsException: Array index out of range: 0"
• KT-35532 Incremental compilation often fails on @JVMMultifileClass
• KT-19806 IncrementalPackagePartProvider cache corruption causes frontend exception

Tools. JPS

• KT-47753 JPS: "IndexOutOfBoundsException: Index 0 out of bounds for length 0": Rebuild triggered due to IOOBE in kotlin.incremental.LookupStorage.<init>
• KT-46804 Slow Kotlin incremental build: LookupStorage operations
• KT-45763 Failing tests in KotlinIDE

Tools. Maven

• KT-45689 JDK-16: kotlin-maven-plugin fails with IllegalAccessError: class com.intellij.util.io.FileChannelUtil when using incremental compilation

Tools. Scripts

• KT-43917 Gradle dependency conflict with resolutionStrategy failOnVersionConflict and kotlin 1.4
• KT-46646 Scripts: ArrayIndexOutOfBoundsException on an empty script running

Tools. REPL

• KT-47783 REPL: Keywords completion appears after numeric and string literals

Tools. kapt

• KT-47583 KaptJavaLog fails on Java 17 due to removed constructor in com.sun.tools.javac.util.Log
• KT-47347 KAPT: Stub generation in Gradle cache is not consistently relocatable
• KT-46651 KAPT: "Source file or directory not found" - kaptGenerateStubsDebugKotlin task does not track source files properly with configuration cache enabled

1.5.30-RC

Backend. Native. Debug

• KT-47405 Incorrect path from inlined method in stacktrace on iOS-simulator ARM64
• KT-47408 Incorrect line number of inlined method on iOS-simulator ARM64

Compiler

New Features

• KT-47709 Make when statements with enum, sealed, and Boolean subjects exhaustive by default
• KT-47699 Support programmatic creation of class annotations and corresponding feature flag on JVM

Performance Improvements

• KT-47785 Compilation time increased when trying to compile AssertJ DB expression in 1.5.21

Fixes

• KT-47941 "IllegalStateException: Expected some types" on a call with several excepted type constraints
• KT-47854 "IllegalArgumentException: Type is inconsistent" with Android's @Nullable annotation starting in Kotlin 1.5.20
• KT-47899 "AssertionError: Intersection type should not be marked nullable" with 1.5.21
• KT-47846 Stack overflow when handling enhanced recursive type parameter
• KT-47747 Introduce specific error for calls which could be resolved only with unrestricted builder inference
• KT-47739 JVM / IR: NoSuchFieldError with generic sealed classes
• KT-47422 -Xjspecify-annotations: If a class has a @Nullable type-parameter bound, Kotlin should still treat some users' type arguments as platform types
• KT-47437 Type inference failure with raw types under -Xjspecify-annotations=strict
• KT-47396 <?> in @NullMarked code should permit nullable types
• KT-47729 False positive INTEGER_OPERATOR_RESOLVE_WILL_CHANGE warning: "expression will be resolved to Int in future releases"
• KT-47333 Xcode 13: Compilation for iOS simulator fails
• KT-47772 False negative WRONG_ANNOTATION_TARGET on type argument to function call
• KT-47467 JVM / IR: "AssertionError: Annotation class expected: deserialized class Array" caused by java annotation as a parameter of another annotation
• KT-47744 UninitializedPropertyAccessException compiler exception on nested builder inference calls
• KT-47724 Type inference: False positive "Returning type parameter has been inferred to Nothing implicitly"
• KT-47660 JVM / IR: Mockito verification fails when named parameters are ordered differently
• KT-47589 Using RequiresOptIn annotation on constructor property results in error even if the annotation has no VALUE_PARAMETER target

IDE

• KT-47947 Add language version 1.6 to the compiler configuration preferences

Libraries

• KT-23351 Regex.splitToSequence, CharSequence.splitToSequence(Regex)
• KT-42851 kotlin.time.Duration toString() shows wrong result for seconds
• KT-45325 Parsing Duration from String
• KT-34021 Regex.matchAt / matchesAt

Native. Stdlib

• KT-47915 Kotlin/Native: Provide access to test cases generated by the compiler

Reflection

• KT-47650 KClass::nestedClasses throws ClassCastException for script classes with type aliases

Tools. CLI

• KT-47623 Deprecate -Xuse-experimental
• KT-30778 kotlin-compiler.jar contains shaded but not relocated kotlinx.coroutines

Tools. Commonizer

• KT-47433 [Commonizer] Commonize functions/properties with TA/Class types in signature
• KT-47691 [Commonizer] Commonize var and val properties
• KT-47434 [Commonizer] Commonize parameterized (type-alias + class) types
• KT-47432 [Commonizer] Commonize (type-alias + class) types used in functions

Tools. Daemon

• KT-47152 Incremental Compilation with Kotlin compile daemon and JDK 17 fails with IllegalAccessException

Tools. Gradle

New Features

• KT-45757 Add an easier way to explicitly set Kotlin daemon jvm arguments

Fixes

• KT-47940 Kotlin JVM toolchain breaks configuration cache
• KT-46626 kotlin-android plugin with kotlin-dsl: Extension with name 'android' does not exist. Currently registered extension names: [ext, kotlin, kotlinTestRegistry]
• KT-47754 “'compileDebugUnitTestJavaWithJavac' task (current target is 1.8)” during build android project without specified target and with jvmToolchain = JDK 11
• KT-47520 Kotlin and Java target compatibility check produces false positive on using Gradle toolchains
• KT-46978 Duplicate resource errors on gradle 7 with multi-module multiplatform project with withJava
• KT-27687 Empty directories in source set causes gradle cache miss for KotlinCompile task
• KT-47635 Kotlin version conflict on using 'noarg' Gradle plugin
• KT-47636 Kotlin version conflict on using 'sam-with-receiver' Gradle plugin
• KT-47354 Kotlin version conflict on using 'allopen' Gradle plugin
• KT-45202 Kapt crashes with java.io.UTFDataFormatException

Tools. Gradle. JS

• KT-47559 KJS / Gradle: Run task created using eager API and breaks task configuration avoidance

Tools. Gradle. Multiplatform

• KT-38111 Gradle DSL: rename useExperimentalAnnotation function
• KT-47612 Task :buildKotlinToolingMetadata is incompatible with Gradle configuration cache
• KT-47611 Task :generateMetadataFileForKotlinMultiplatformPublication is incompatible with Gradle configuration cache

Tools. Gradle. Native

• KT-47653 Support multi arch build via embedAndSign task
• KT-47078 Support Apple Silicon in cocoapods gradle plugin
• KT-47077 Support Apple Silicon in embedAndSign task

Tools. Maven

• KT-45689 JDK-16: kotlin-maven-plugin fails with IllegalAccessError: class com.intellij.util.io.FileChannelUtil when using incremental compilation

Tools. Scripts

• KT-43917 Gradle dependency conflict with resolutionStrategy failOnVersionConflict and kotlin 1.4

1.5.30-M1

Compiler

New Features

• KT-32443 Experimental declarations should be contagious even when they are not explicitly used
• KT-45844 Forbid using experimental markers on override declarations
• KT-45845 Forbid using experimental markers on getter
• KT-46644 Resolve overrides for IrProperty on deserialization
• KT-46967 Support class type parameters annotations in FIR
• KT-47402 Native: optimize access to object declarations that have only const vals and no init blocks

Fixes

• KT-22852 Report diagnostics on implicit usages of experimental API
• KT-22941 Experimental marker annotation with SOURCE retention is compiled without error
• KT-24993 Inference for buildSequence/yield doesn't work for labeled lambdas
• KT-31728 Incorrect EXPERIMENTAL_OVERRIDE_ERROR for override of experimental function in anonymous object
• KT-33364 Kotlin/Native debugger: execution stops only at next line for breakpoint at when expression without parameter
• KT-42139 NI: NEW_INFERENCE_NO_INFORMATION_FOR_PARAMETER for emptyList / listOf (with no arguments) / emptyMap / mapOf (with no arguments) inside if block inside sequence block
• KT-44241 NI: BuilderInference regression
• KT-44372 FIR: KClass::java cannot be resolved as callable reference
• KT-44547 Native: wrong RTTI when overriding functions with equal signatures but different type arguments
• KT-44571 Segfault on unnecessary int unboxing
• KT-45083 Problem with property reference in builder inference
• KT-45315 Deprecate (V)::a reference resolution to companion in FE 1.0
• KT-46393 AE: "1 trailing arguments were found in Any type" for private function with implicit anonymous return type inside generic class
• KT-46661 FIR: Investigate inference issue with self-types and star projection
• KT-46775 [Native] [IR] Support multiple suspend lambdas as class supertypes
• KT-46836 Error: Invalid LLVM module on inlineClasses external tests
• KT-46838 NullPointerException: Parameter specified as non-null is null in CollectionsKt.joinToString()
• KT-46896 Native IR: NPE when using irBuiltIns.suspendFunction
• KT-46996 FIR: INFERENCE_NO_INFORMATION_FOR_PARAMETER on type aliases with non-trivial expansions
• KT-47034 KtValueArgument.getArgumentExpression could lead to StubBasedPsiElementBase.notBoundInExistingAst
• KT-47052 BuilderInference case with flatMapTo doesn't work properly
• KT-47082 Stub type variable is leaked (reproduces with K/N during deserialization)
• KT-47143 ClassicTypeSystemContext couldn't handle: Captured(*) in Kotlin 1.5.0
• KT-47148 Type mismatch: inferred type is Any? but T? was expected
• KT-47180 Forbid using OptIn markers on local variable, value parameter or field
• KT-47181 Forbid using OptIn markers on types or type parameters
• KT-47183 Segfault on int unboxing
• KT-47208 Backend Internal error: Exception during IR lowering: assert at IrOverridingUtilKt.buildFakeOverrideMember
• KT-47276 Nullability annotations without target are ignored if type enhancement improvements are enabled
• KT-47450 StackOverflowException in psi2ir with many chained binary expressions
• KT-47462 K/N: AssertionError: Unbound private symbol org.jetbrains.kotlin.ir.symbols.impl.IrClassSymbolImpl@6cb748db (NON-PUBLIC API): deserialized class Companion

IDE

• KT-44643 ISE: Could not generate LightClass for some declared in on initialisation by lazy in a JVM module of a multiplatform project

IDE. Gradle Integration

• KT-47163 KJS / Gradle: Could not resolve <artifact> despite being resolvable & project buildable

IDE. JS

• KT-47557 KJS: With NPM dependency IDEA import fails when performed before Gradle build

JavaScript

• KT-38363 JS IR BE: support IC for lowerings
• KT-45738 KJS / IR: Wrong generated code for when statement
• KT-46520 KJS / IR: ISE "Can't find name for declaration FUN name:CharArray_init_$Create$" on callable reference to Array constructor
• KT-46551 KJS / IR: Add a basic sourcemap generation

Libraries

• KT-47477 Could not resolve kotlin-test during project import in case of multiplatform with only JVM target platform

Native

• KT-35001 warning: linking module flags 'SDK Version': IDs have conflicting values ('[2 x i32] [i32 13, i32 2]'
• KT-43475 Kotlin/Native compiler: Including a static C library increased cross-compilation time from 3.5minutes to 1 hour 40 minutes
• KT-44148 Escape analysis failure: Heap space out of memory

Native. C and ObjC Import

• KT-46711 platform.windows._LARGE_INTEGER cannot be passed by value

Native. ObjC Export

• KT-43780 Improve Swift/Obj-C ergonomics for object and companion object
• KT-46431 KMP accessing a property of an anonymous inner class that inherits from an abstract class causes a 'NSGenericException', reason: '[Shared_kobjcc0 ] is abstract' exception.
• KT-47042 Kotlin/Native: Concurrency Interoperability with Objective-C (Swift 5.5)

Native. Platforms

• KT-44321 Support Apple Silicon without Rosetta 2

Reflection

• KT-18277 InvalidProtocolBufferException: Stream closed on multithreaded access to built-ins data in reflection
• KT-44977 Reflection: ClassCastException caused by annotations with "AnnotationTarget.TYPE" usage on array attributes access

Tools. CLI

• KT-40979 CLI: Executing "kotlinc.bat" at a root path, errors are not reported with a correct filepath
• KT-40994 CLI: Add documentation for -J argument in kotlinc -help
• KT-46764 CLI: Java record defined in a single file root is not resolved

Tools. Commonizer

• KT-45992 [Commonizer] Allow commonization of TypeAlias and Class with same name
• KT-46716 [Commonizer] Analyze leaf source sets with original platform libraries
• KT-46957 [Commonizer] Unresolved classifier: platform/posix/ptrdiff_t for linuxMips32
• KT-47133 Forbid cinterop commonization with hierarchical commonization turned off
• KT-47301 [Commonizer] Associative commonization

Tools. Compiler Plugins

• KT-46723 Kotlin Lombok: JPS: config file is searched in directory relative to compiler daemon
• KT-46739 @SerialInfo NPE with default parameter

Tools. Gradle

• KT-13258 Kotlin compiler doesn't respect Gradle's "sourceCompatibility" and "targetCompatibility"
• KT-43095 Add support for Java Toolchain to the Gradle plugin
• KT-45611 KGP should declare JDK version as input
• KT-47185 Migrate Gradle Integration tests to use cache redirector

Tools. Gradle. JS

• KT-47176 KJS: Actualize NPM dependencies
• KT-47154 KJS / Gradle: Compile task reads dependencies metadata from filesystem too long on large projects
• KT-47114 KJS / IR: Could not resolve coroutines-core-js
• KT-43379 KJS / Gradle: On windows, an invalid regex is generated for Webpack ProgressPlugin

Tools. Gradle. Multiplatform

• KT-47126 ios() target shortcuts should not include Apple Silicon by default

Tools. Gradle. Native

• KT-42023 Kotlin Native Cocoapods plugin fails when Xcode project has custom CONFIGURATION names

Tools. Incremental Compile

• KT-27660 JS Incremental compilation fails with java.io.IOException: java.lang.ArrayIndexOutOfBoundsException: Array index out of range: 0

Tools. JPS

• KT-45763 Failing tests in KotlinIDE

Tools. Scripts

• KT-46646 Scripts: ArrayIndexOutOfBoundsException on an empty script running

1.5.21

Compiler

• KT-47320 "StringConcatException: Mismatched number of concat arguments" String concatenation fails when template contains special character
• KT-47445 "definitely not null type parameters is only available since language version 1.6" error in cast expression
• KT-47446 Improve warning message INTEGER_OPERATOR_RESOLVE_WILL_CHANGE
• KT-47447 False positive INTEGER_OPERATOR_RESOLVE_WILL_CHANGE warning: "expression will be resolved to Int in future releases"
• KT-47449 JVM / IR: ClassCastException IrStarProjectionImpl cannot be cast to IrTypeProjection
• KT-47459 "IndexOutOfBoundsException: Index 0 out of bounds for length 0" caused by MarkertManager dependency
• KT-47480 StackOverflowError: Recursion on erasion of raw type with interdependent type parameters

Tools. Compiler Plugins

• KT-47161 Serializable class can't be inherited from serializable class in other module with: e: org.jetbrains.kotlin.codegen.CompilationException: Back-end (JVM) Internal error: Couldn't transform method node: write$Self
• KT-47455 Kotlin lombok plugin NullPointerException
• KT-47513 Lombok compiler plugin failed with 'Recursion detected in a lazy value under LockBasedStorageManager@1c21db60 (TopDownAnalyzer for JVM)'

Tools. Gradle

• KT-47444 Gradle Plugin: Publishing project with "maven-publish" fails when dependency versions are omitted (NPE in MppDependencyRewritingUtilsKt.associateDependenciesWithActualModuleDependencies)

Tools. kapt

• KT-47416 Kapt Gradle DSL ignores javaCompilerOptions in 1.5.20

1.5.20

Compiler

New Features

• KT-43262 No error for Java generic class @NotNull type parameter used in Kotlin with nullable type argument
• KT-44373 FIR: support error / warning suppression
• KT-45189 Support nullability annotations at module level
• KT-45284 Emit warnings based on jspecify annotations
• KT-45525 Allow to omit JvmInline annotation for expect value classes
• KT-46545 Emit annotations on function type parameters into bytecode for -jvm-target 1.8 and above

Performance Improvements

• KT-36646 Don't box primitive values in equality comparison with objects in JVM_IR

Fixes

• KT-8325 Unresolved annotation should be an error
• KT-19455 Type annotation unresolved on a type parameter of a supertype in anonymous object expression
• KT-24643 Prohibit using a type parameter declared for an extension property inside delegate
• KT-25876 Annotations on return types and supertypes are not analyzed
• KT-28449 Annotation target is not analyzed in several cases for type annotations
• KT-36770 Prohibit unsafe calls with expected @NotNull T and given Kotlin generic parameter with nullable bound
• KT-36880 K/N IR: Reference to expect property in actual declaration is not remapped
• KT-38325 IllegalStateException: No parameter with index 0-0 when iterating Scala 2.12.11 List
• KT-38342 FIR: Consider renaming diagnostic from AMBIGUITY to OVERLOAD_RESOLUTION_AMBIGUITY
• KT-38476 [FIR] Forgotten type approximation
• KT-38540 Kotlin/Native Set.contains fails with specific enum setup
• KT-40425 IrGenerationExtension. Support simple reporting to compiler output (for development/debug)
• KT-41620 ClassCastException: Class cannot be cast to java.lang.Void
• KT-41679 NI: TYPE_MISMATCH wrong type inference of collection with type Any and integer literal
• KT-41818 NI: False positive IMPLICIT_NOTHING_TYPE_ARGUMENT_IN_RETURN_POSITION leads to NothingValueException on delegated properties
• KT-42239 IR: Report compilation error instead of throwing an exception (effectively crash compiler) when some declaration wasn't found while deserialization
• KT-42631 ArrayIndexOutOfBoundsException was thrown during IR lowering
• KT-43258 NI: False positive "Suspend function 'invoke' should be called only from a coroutine or another suspend function" when calling suspend operator fun on object property from last expression of a crossinlined suspend lambda
• KT-44036 Enum initialization order
• KT-44511 FIR DFA: smartcast after if (nullable ?: boolean)
• KT-44554 RAW FIR: NPE in RawFirBuilder
• KT-44682 raw FIR: incorrect source for qualified access
• KT-44695 *_TYPE_MISMATCH_ON_OVERRIDE checkers do not work for anonymous objects
• KT-44699 FIR: incorrect lambda return type (led to a false alarm: PROPERTY_TYPE_MISMATCH_ON_OVERRIDE)
• KT-44802 FIR bootstrap: trying to access package private class
• KT-44813 FIR bootstrap: various errors in collection-like classes
• KT-44814 FIR bootstrap: incorrect cast in when branch
• KT-44942 [FIR] ClassCastException in boostrap tests
• KT-44995 FIR: false positive for ANNOTATION_ARGUMENT_MUST_BE_CONST
• KT-45010 FIR: lambda arguments of inapplicable call is not resolved
• KT-45048 FIR bootstrap: VerifyError on KtUltraLightClass
• KT-45052 FIR bootstrap: inapplicable candidate in GenerateSpecTests.kt
• KT-45121 FIR IDE: redundant vararg parameter type transformation
• KT-45136 Native: dividing Int.MIN_VALUE by -1 crashes or hangs
• KT-45236 JVM / IR: "IllegalStateException: Symbol with IrTypeParameterSymbolImpl is unbound" caused by contracts and sealed class
• KT-45308 Psi2ir: "AssertionError: TypeAliasDescriptor expected" caused by using typealias from one module as a type in another module without a transitive dependency
• KT-45316 [FIR] Ambiguity between two implicit invokes with receiver
• KT-45344 FIR: Wrong inferred type for nullable type parameter
• KT-45385 FIR: false positive MUST_BE_INITIALIZED_OR_BE_ABSTRACT after rethrow
• KT-45475 [FIR] No smartcast after throw in if inside try block
• KT-45508 False negative ABSTRACT_CLASS_MEMBER_NOT_IMPLEMENTED on a fake override with an abstract super class member
• KT-45578 REPL: Unresolved imports are cached for the subsequent compilations
• KT-45685 JVM IR: capturing a variable into crossinline suspend lambda makes the function inside inline function no longer unbox Result
• KT-45584 [FIR] Fix overriding property and java function in java class
• KT-45697 JVM IR: ISE "Function has no body" on getter of private field in a class present both in sources and dependencies
• KT-45842 Compiler doesn't allow a shared class to inherit a platform-specific sealed class
• KT-45848 False negative [SEALED_INHERITOR_IN_DIFFERENT_MODULE] error in compiler for a platform-specific inheritor of a shared sealed class
• KT-45931 There is no warning based on nullability java annotation
• KT-45998 JVM IR: AE when an accessor to a protected companion object member is being generated in child class
• KT-46048 Enum entries init order in companion object
• KT-46074 FIR: private-in-file fun interface is considered invisible in this file
• KT-46173 No error reporting on annotations on target type of as expression in return
• KT-46235 JVM IR: Stack overflow error on large expressions
• KT-46270 [FIR] Support @PublishedAPI in inline checker
• KT-46539 Generate annotations on type parameters bounds in bytecode
• KT-46578 JVM IR: IllegalAccessError accessing property delegated to java super class protected field reference
• KT-46597 JVM IR: AssertionError: SyntheticAccessorLowering should not attempt to modify other files - crossinline accessor
• KT-46601 JVM / IR: IllegalStateException: "Can't find method 'invokeinvoke`" when default lambda takes inline class parameters
• KT-46670 StackOverflowError on inheritance from raw type where class has protobuf-like recursive generics
• KT-46715 JVM / IR: "AssertionError: Unbound symbols not allowed IrConstructorSymbolImpl" with enum classes with the same name in test and src folders
• KT-46759 JVM IR: CCE in LateinitUsageLowering on @JvmStatic lateinit property in object
• KT-46777 [Native] [IR] Support suspend function as super type
• KT-46802 JVM / IR: "UnsupportedOperationException: Unknown structure of ADAPTER_FOR_CALLABLE_REFERENCE" caused by function reference on @JvmStatic function with unused default parameters
• KT-46813 JVM / IR: "ClassCastException: Integer cannot be cast to class Result" with Flow and fold method
• KT-46822 JVM IR: StackOverflowError on compiling a large data class
• KT-46837 Backend Internal error: Exception during IR lowering: assert at IrOverridingUtilKt.buildFakeOverrideMember
• KT-46921 JVM / IR: "IndexOutOfBoundsException: Cannot pop operand off an empty stack" caused by crossinline parameter and label return
• KT-46984 Type parameter bounds aren't used to report corresponding mismatch warnings
• KT-46985 There aren't warnings by java nullability annotations
• KT-46986 There aren't warnings by java nullability annotations
• KT-46989 There aren't warnings by java nullability annotations
• KT-46990 There aren't warnings by java nullability annotations on method's violated type arguments
• KT-47019 K/N: IrProperty.overriddenSymbols can't be used in common IR backend modules yet because it doesn't fully work in Native

Docs & Examples

• KT-33783 Document when a range created with rangeTo is empty

IDE

• KT-44638 clone() call is unresolved in JVM module of a multiplatform project
• KT-45629 [ULC] KtUltraLightFieldForSourceDeclaration.nameIdentifier returns null
• KT-44825 Can't open Kotlin compiler settings in newly created project
• KT-45908 Reproduciable 'org.jetbrains.kotlin.idea.caches.resolve.KotlinIdeaResolutionException: Kotlin resolution encountered a problem while analyzing KtNameReferenceExpression'

IDE. FIR

• KT-45175 FIR IDE: Exception with local property in init block
• KT-45199 FIR IDE: Error while collecting diagnostic on stale element after replacing element in quickfix
• KT-45312 FIR IDE: FIR plugin throws exception on synthetic function

IDE. Gradle Integration

• KT-34401 KotlinGradleModelBuilder builds models for non-kotlin modules and always trigger full task configuration.
• KT-45277 Wrong jvm target in gradle module in IDEA
• KT-46488 Import of a multiplatform project with MPP module depending on Kotlin/JVM one fails

IDE. Inspections and Intentions

• KT-45075 Inspection: Redundant creation of Json format
• KT-45347 Sealed interfaces: quickfix to move to package/module of sealed class/interface should not be shown in case of read-only declaration
• KT-45348 Sealed interfaces: show error for usage of sealed class/interface from a library in Java source code
• KT-46063 In multiplatform code, suggest to generate remaining when branches at least for shared sealed classes

IDE. Refactorings

• KT-44431 Quickfix to move class/interface to proper location: it is allowed to choose test source in JPS project while compiler does not allow it

IDE. Native

• KT-39320 [Commonizer] Reduce memory consumption

JavaScript

• KT-40235 KJS: IR. Broken support for external interface companion
• KT-40689 KJS / IR: strange and slow code for kotlin.math.max and kotlin.math.min for Double
• KT-44138 KJS / IR: Constant folding works incorrectly with unsigned arithmetic
• KT-44394 KJS / IR: null companion object for existed stdlib interfaces NodeFilter and SVGUnitTypes
• KT-44950 KJS / IR: "IllegalStateException: Can't find name for declaration" in case of extending export declared class without @JsExport annotation
• KT-45057 KJS / IR: "ClassCastException" when using js function in init block
• KT-45361 KJS / IR: IrConstructorCall representing annotation always returns Unit
• KT-46608 KJS: "Could not load content..." for source maps
• KT-45655 KJS: "REINTERPRET_CAST" is not copyable
• KT-45866 Default parameter with generic in expect-actual declarations
• KT-46859 Exception during IR lowering: NullPointerException was thrown at: optimizations.FoldConstantLowering.tryFoldingUnaryOps

KMM Plugin

• KT-43899 KMM: Fix "stale framework" usage by XCode & AppCode in default build script

Libraries

• KT-43701 Stdlib: Expand KDoc of inc() and dec() for operators
• KT-46002 Support all Unicode digit chars in digitToInt (JS and Native)
• KT-46183 Add default value for ignoreCase in K/N String.replace/replaceFirst
• KT-46184 Equivalize isLowerCase and isUpperCase behavior in all platforms

Native

• KT-33175 IR: String constants with incorrect surrogate pairs aren't preserved during serialization/deserialization
• KT-44799 Different behavior with functional interfaces in Kotlin/Native on iOS

Native. C Export

• KT-42796 [Reverse C Interop] Package with no public methods generate empty struct in the header, leading to an error

Native. ObjC Export

• KT-38600 Kotlin MP iOS Target doesn't contain kdoc comments
• KT-45127 KMM: hard to pass an error to Kotlin code from implementation of Kotlin method in Swift code

Native. Runtime. Memory

• KT-45063 Profiling indicates that a lot of time is spent on updateHeapRef on Apple platforms when running KMP code

Reflection

• KT-10838 Provide sensible toString() for property accessors in reflection
• KT-13490 Equality doesn't work for KProperty.Accessor implementations

Tools. CLI

• KT-14772 ISE (FNFE "Not a directory") on compilation with destination argument clashing with an existing file which is not a directory
• KT-18184 CompileEnvironmentException: Invalid jar path on "-d" with .jar in non-existing directory
• KT-40977 Report a readable diagnostic on empty -J argument in CLI

Tools. Commonizer

• KT-45497 [Commonizer] c-interop commonization: Dependency commonization
• KT-46077 [Commonizer] Add commonizer_target to commonized klib's manifest
• KT-46107 [Commonizer] CInteropCommonizerTask receives faulty dependencies in multi module projects containing multiple c-interops
• KT-46248 MPP: Compile KotlinMetadata fails with Unresolved reference if only one native platform from shared source set is available
• KT-46856 [Commonizer] Many targets can fail with 'filename too long'

Tools. Compiler Plugins

• KT-7112 Support calling Lombok-generated methods within same module
• KT-45538 Serialization, JVM IR: "AssertionError: No such type argument slot in IrConstructorCallImpl" with inner classes
• KT-45541 JVM / IR / Serialization: NullPointerException caused by "Serializable" annotation and local data class
• KT-46469 Kotlin Lombok: accessors with AccessLevel.MODULE fail to resolve
• KT-46529 Kotlin Lombok: with @Accessors without explicit prefix the prefix from lombok.config is not taken into account
• KT-46531 Kotlin Lombok: lombok.getter.noIsPrefix is processed depending on character case
• KT-46920 NullPointerException in CodeGeneratorVisitor when packing for xcode

Tools. Gradle

• KT-24533 Kapt should not run when annotation processors are not configured
• KT-43988 Enable plugin validation during build
• KT-45301 Gradle: Empty build/kotlin dir with custom build directory
• KT-45519 loadAndroidPluginVersion() impacts performance negatively and noticeably in multimodule Android build
• KT-45744 Create Kotlin Gradle Plugin JUnit5 basic test setup
• KT-45834 Gradle Plugin read system property related to kotlinCompilerClasspath breaks use of configuration cache
• KT-46401 Deprecate 'kotlin.parallel.tasks.in.project' build property
• KT-46820 Gradle: kotlinc (1.5.0) race condition causes a NullPointerException
• KT-47317 Restore 'kotlinPluginVersion' property in 'KotlinBasePluginWrapper'

Tools. Gradle. JS

• KT-42911 Support Gradle configuration cache for K/JS tasks
• KT-45294 KJS / Gradle: Number of modules in project affects JS tasks configuration cache state size
• KT-45754 KJS / IR: Remove adding option of source maps in Gradle plugin
• KT-46178 KJS / Dukat: Added as a dependency always without condition
• KT-46976 KJS: Broken support for dynamically created webpack.config.d
• KT-47045 [Gradle, JS] Task requirements are added to all compilations with same name

Tools. Gradle. Multiplatform

• KT-36679 MPP Gradle plugin: Improve messaging for the commonizer
• KT-45832 CInteropCommonization: Filter out illegal dependencies
• KT-46394 Multiplatform: Gradle 7 support
• KT-46517 Add kotlin-project-model as api dependency to kotlin-gradle-plugin-api

Tools. Gradle. Native

• KT-27240 MPP Gradle plugin: Provide a framework packing task for Kotlin/Native
• KT-39016 Missing stdlib when the downloading process was aborted
• KT-40907 Xcode error after switching between device and simulator: Building for iOS, but the linked and embedded framework was built for iOS Simulator.
• KT-44059 iosSimTest tasks are never up-to-date
• KT-45801 compileIosMainKotlinMetadata compilation property of gradle task is not initialized and fails with Execution failed for task ':shared:generateProjectStructureMetadata'
• KT-46680 Register concrete "embedAndSign" tasks instead umbrella
• KT-46892 Kotlin Multiplatform Gradle Plugin: EmbedAndSign task always contains a default framework name

Tools. Incremental Compile

• KT-44741 Incremental compilation: inspectClassesForKotlinIC doesn't determine changes with imported constant

Tools. JPS

• KT-34351 KotlinTargetsIndex creation takes too long even if project doesn't have any kotlin
• KT-45191 [JPS] Marking method as "default" in Java SAM interface doesn't affect dependencies
• KT-46242 Support Lombok kotlin plugin in JPS and maven

Tools. kapt

Performance Improvements

• KT-28901 Consider caching annotation processors classloaders

Fixes

• KT-27123 kapt: missing space in error log makes location non-clickable
• KT-29929 [Kapt] Stub generator uses constant value in method annotation instead of constant name 2.
• KT-31146 kapt: executableElement.getAnnotation(JvmOverloads::class.java) returns null
• KT-32202 Gradle task kaptKotlin fails: "module not found" in Java 11 modular application
• KT-34838 Kapt: 'cannot find symbol' for a top-level property with anonymous delegate
• KT-35104 Support @JvmStatic in KAPT stubs
• KT-35167 Kapt Gradle plugin doesn't handle --module-path javac argument
• KT-37586 KAPT: When delegated property use an unknown type (to-be-generated class), correctTypeError will mess up the $delegate field type
• KT-39060 Kapt: correctErrorTypes don't retain return type of getter in Java stub
• KT-39715 KaptGenerateStubsTask resolves annotation processor options too early (before execution time)
• KT-41581 Kapt doesn't have line breaks between warnings
• KT-43804 Kapt fails to preserve parameter names in open suspend functions
• KT-43686 KaptWithoutKotlincTask should use @CompileClasspath for kotlinStdlibClasspath for cache relocateability.
• KT-45032 Kapt: NullPointerException: insnList.first must not be null
• KT-46176 Kapt: "java.lang.IndexOutOfBoundsException: Index -1 out of bounds for length 3" with delegation and property reference

1.5.10

Compiler

Fixes

• KT-41078 Incorrect type substitution in contracts with type parameters
• KT-44770 JVM / IR: "IllegalArgumentException: Unrecognized Type: [null]" Jackson doesn't recognize type
• KT-45084 JVM IR: "NoSuchElementException: Sequence contains no element matching the predicate" when inline class is passed to lambda with >22 parameters
• KT-45779 JVM / IR: java.lang.NoSuchMethodError: 'int java.lang.Integer.plus(int)' caused by function reference
• KT-45941 JVM IR: local functions use generic type parameters of the outer class in the bytecode, which breaks Bytebuddy and MockK
• KT-46149 Generate synthetic classes for SAM adapters with erased instead of generic supertype
• KT-46189 JVM IR: tailrec function with capturing lambda in default parameter value leads to NoSuchMethodError at runtime
• KT-46214 JVM / IR: "IllegalStateException: No mapping for symbol: VALUE_PARAMETER INSTANCE_RECEIVER" on a suspend function in an inner class
• KT-46238 JVM IR: BootstrapMethodError in JDK 11+ on intersection type passed in arguments of SAM adapter where SAM interface's type parameter has a non-trivial upper bound
• KT-46259 JVM IR: local function for adapted function reference is not declared as ACC_SYNTHETIC
• KT-46284 JVM IR: "Unbound private symbol IrClassSymbol" on class reference to script class
• KT-46402 IllegalAccessError: "CapturedLambdaInterpreter (in unnamed module @0x71b06418) cannot access class jdk.internal.org.objectweb.asm.Type" caused by inline function with a suspend parameter in Maven project
• KT-46408 JVM IR: BootstrapMethodError due to missing bridge for subclass of generic Java interface
• KT-46426 JVM IR: Corrupted .class file when passing Array constructor reference as (inline) lambda
• KT-46455 OOM on parsing invalid code with string interpolation
• KT-46503 JVM IR: "AssertionError: Unexpected variance in super type argument: out @1"
• KT-46505 JVM IR: NullPointerException caused by a callable reference with nullable inline value class parameter
• KT-46512 JVM / IR: NoSuchMethodError on SAM conversion of a function reference
• KT-46515 IndexOutOfBoundsException: "Empty list doesn't contain element at index 0." on bad variable name in 1.5.0
• KT-46516 JVM IR: "AnalyzerException: Expected I, but found R" on subclassing AbstractMutableList
• KT-46524 Cannot use unsigned literals with api-version < 1.5 even with opt-in
• KT-46537 JVM / IR: "IllegalStateException: No noarg super constructor for CLASS" caused by "No-arg" plugin with annotation on child class
• KT-46540 JVM / IR: AnalyzerException: Expected an object reference, but found J caused by java.function.Supplier
• KT-46554 JVM IR: "IllegalStateException: No mapping for symbol: VAR IR_TEMPORARY_VARIABLE" with value class constructor delegation call
• KT-46555 JVM IR: IllegalAccessError when using Java method reference
• KT-46562 Kotlin 1.5.0 generates non-serializable lambdas when they should be serializable
• KT-46568 JVM IR: "AssertionError: IrCall expected inside JvmStatic wrapper" on compiling protected static function with return type Nothing inside companion object of abstract class
• KT-46574 JVM / IR: ClassCastException caused by runBlocking awaiting call while returning Kotlin.Result type.
• KT-46579 JVM IR: "IllegalArgumentException: Sequence contains more than one matching element" for Java enum with overloaded values() static method
• KT-46584 JVM IR: Intrinsics.needClassReification (UnsupportedOperationException thrown). Property delegate provider crossinline lambda inlining/reification issue
• KT-46751 JVM / IR:"ClassCastException: java.lang.String cannot be cast to java.lang.Void" in extension function in Kotlin 1.5

IDE

• KT-45981 failed to analyze: java.lang.AssertionError: diagnostic callback has been already registered: Code analysis get stuck in AS 2020.3.1.14 & Kotlin v1.5.0-M2
• KT-46622 60+ second freezes with Kotlin plugin 1.5.0: GetModuleInfoKt.findJvmStdlibAcrossDependencies

IDE. Gradle Integration

• KT-46417 [UNRESOLVED_REFERENCE] For project to project dependencies of native platform test source sets

Libraries

• KT-46280 JvmRecord annotation missing constructor in common

Middle-end. IR

• KT-44013 NPE: When calling constructor of a function type while inheriting from it, despite it's an interface

Tools. Android Extensions

• KT-46590 Kotlin Android Extensions 1.5.0 generates bad writeToParcel() method for nullable Array types

Tools. Gradle

• KT-41142 Kotlin version conflict when using Kotlin Gradle plugins in pre-compiled script plugin
• KT-46353 Optimizations disabled in Gradle 7 for KAPT when generating sources
• KT-46368 Memory leak with 1.5.0-RC when building with Gradle
• KT-46689 Track -Xuse-old-backend flag usage

Tools. Gradle. JS

• KT-46006 KJS \ Gradle: Task without declaring an explicit or implicit dependency on jsGenerateExternalsIntegrated in Gradle 7
• KT-46162 KJS: Exported items unavailable on dev server
• KT-46331 KJS: With kotlin.js.webpack.major.version=4 browserXRun tasks fail

Tools. Parcelize

• KT-46567 Kotlin 1.5.0 parcelize compilation fails in new backend when using TypeParceller with nested generics

Tools. kapt

• KT-45532 Do not create Kapt stubs directory during configuration time

1.5.0

Backend. Native

• KT-42053 Support compiler caches for linux_x64
• KT-43690 Support compiler caches for ios_arm64

Backend. IR

• KT-42684 StackOverflowError on recursive inline arguments in inline fun

Compiler

New Features

• KT-28791 Kotlin serialization with inline classes
• KT-30222 Support JVM target version selection in Kotlin bytecode tool window
• KT-41884 Support 'file' target for JvmSynthetic annotation
• KT-43677 Support for Java records
• KT-43920 Support loading binary Java annotations on fields
• KT-44278 Generate SAM-converted lambdas and function references using 'invokedynamic' on JDK 1.8+
• KT-44650 Deprecate JVM target version 1.6
• KT-44787 Suspend functions in fun interfaces
• KT-44865 Allow to declare protected constructors in sealed classes
• KT-44869 Compiling sealed interface with version less than 1.5: error message from future could be provided

Performance Improvements

• KT-6336 Optimize generation of local functions
• KT-7307 Optimize infix call of String.plus
• KT-18692 Optimize '<optimizable_range> step x' for-in loop
• KT-19978 Inefficient bytecode generated for function references undergoing Java SAM conversion
• KT-23565 OperationsMapGenerated.kt generates unreasonable amount of bytecode
• KT-23825 Tail suspend call utilizing elvis operator does not take advantage of suspend tail call optimization
• KT-23826 A suspend function on the right side of a returned || condition is not tail call optimized
• KT-25348 No compile time unsigned integer conversion when using hex literal
• KT-26060 Support a compiler mode to compile lambda expressions using invokedynamic instruction
• KT-26590 Do not generate create method for suspend lambdas if its arity >= 2
• KT-27427 Optimize nullable check introduced with 'as' cast
• KT-28246 Redundant boxing/unboxing isn't eliminated by the compiler in case of inline classes and javaClass intrinsic
• KT-30605 Constant folding doesn't evaluate inv() function
• KT-36845 Generate enum-based TABLESWITCH/LOOKUPSWITCH on a value with smart cast to enum in JVM_IR
• KT-39585 JVM BE generates redundant accessor calls when accessing static final field lifted from companion
• KT-40886 Old JVM BE unspills ACONST_NULL from continuation
• KT-42621 Kotlin binary size considerably larger for code extensively using stream API
• KT-44153 NI: Low Memory and IntelliJ hangs when quotes in split() are missed
• KT-45410 JVM / IR: Extreme performance regression on arithmetic operations inside a loop

Fixes

• KT-6007 Support changed return type of inlined generic function when lambda returns anonymous object
• KT-6055 Failed invoke plus assign on array element accessed via several args through local get/set convention extensions
• KT-6879 CompilationException when local classes hierarchy is placed within other local or inner declaration
• KT-8120 NoSuchMethodError on local class constructor call inside a local class
• KT-8199 "Cannot pop operand off an empty stack" for local class using a captured variable as default value for constructor parameter
• KT-10835 "AssertionError: Non-outer parameter incorrectly mapped to outer" when inlining object literal extending inner class
• KT-12790 Don't generate synthetic accessors for private inline function/properties
• KT-13213 IllegalArgumentException in ByteVector.putUTF8 on attempt to compile file with moderately long string literal
• KT-14628 "UnsupportedOperationException: Don't know how to generate outer expression" for nested class inheriting from inner class with a companion object
• KT-14833 JVM internal error: Augment assignment and increment are not supported for local delegated properties and inline properties
• KT-15403 Suspend operator get wrong code generated by BE (NoSuchMethodError)
• KT-15404 Suspend operator set wrong code generated
• KT-16084 Proguard can't find enclosing class of let closure inside apply closure
• KT-16151 Internal compiler error when using plusAssign operator with mutable map
• KT-16221 Support in/!in suspend operators
• KT-16282 "Cannot pop operand off an empty stack" for plusAssign with default parameters in setter operator
• KT-16445 java.lang.VerifyError: Bad type on operand stack when delegating an interface through a private reified function inside an object
• KT-16520 Invalid bytecode semantics for set call by convention with default parameters
• KT-16567 Inliner creates redundant objects on source inlining
• KT-16752 Delegating function interface to function reference does not work
• KT-17554 Incorrect cast to Unit generated on annotated when-expression with a single-branch if inside
• KT-17738 Java cannot extend class implementing kotlin.collections.Map
• KT-17753 Strange behavior of if and return statements
• KT-18583 "ISE: Recursive call in a lazy value" for generic sealed class with nested subclass in a when(this) with inferred return type
• KT-19861 "IllegalStateException: Label wasn't found during iterating through instructions" for plusAssign with safe call
• KT-20306 Make 'when' over an 'expect' enum class non-exhaustive
• KT-20869 kotlin.jvm.internal.DefaultConstructorMarker should be public
• KT-20996 IllegalStateException: Cannot get FQ name of local class: class in metadata serialization for common code
• KT-21014 Incorrect bytecode generated for 'PrimitiveArray::size'
• KT-21092 Reference javaClass for generic property: "couldn't transform method node: get()"
• KT-21778 "IllegalStateException: Couldn't build context" for inline function inside an anonymous object
• KT-21900 VerifyError on equals on generic primitive type
• KT-22098 "UnsupportedOperationException: Don't know how to generate outer expression" on extension function call inside lambda in anonymous object super constructor call
• KT-22488 Bad line numbers generated for '&&' expression
• KT-22972 A compiler bug(?) in Number class descendants
• KT-23619 Transform stateless singleton lambda during inline
• KT-23881 Declaration of lambda in inlined apply block holds reference to superfluous references causing leak
• KT-24135 Calling invoke on crossinline suspend lambda leads to no state-machine
• KT-24193 NoClassDefFoundError: java/lang/Cloneable$DefaultImpls on inheritance from Cloneable through an interface
• KT-24305 ClassNotFoundException when using Java reflection on local class in an inlined lambda
• KT-24564 Custom operator fun set on ByteArray resolves properly but is miscompiled
• KT-25400 "NoClassDefFoundError: kotlin/KotlinPackage" with Turkish system locale on macOS
• KT-26130 Incorrect method signature for a generic function with inline class as a type parameter upper bound
• KT-26360 "Method from super interface has a different signature" for Interface that extends both interfaces with and without @JvmDefault
• KT-26473 Error on compiling inline class with calls of super methods equals(), hashCode(), toString()
• KT-26474 VE “Bad type on operand stack” at runtime on calling toString() method of inline class with calls of super methods (toString(), equals(), hashCode()) inside
• KT-26592 Do not generate private suspend functions as synthetic package-private
• KT-27449 NoSuchMethodError for local suspend function with suspend lambda parameter with default value
• KT-27469 "Cannot pop operand off an empty stack" for compound assignment (plusAssign) with a vararg operator get
• KT-27825 Gradually prohibit non-abstract classes containing abstract members invisible from that classes (internal/package-private)
• KT-27830 "Incompatible stack heights" with suspend inline function in do while loop that executes suspend lambda
• KT-28042 "Cannot pop operand off an empty stack" for a bound callable reference of lambda inside inline function
• KT-28166 "Argument 1: expected I, but found R" for generic method with generic parameter or receiver with inline class upper bound
• KT-28331 Consider generating accessors for lateinit properties to avoid assertion on each call
• KT-28573 Inliner does not update references to transformed object
• KT-29331 "AnalyzerException: Argument 1: expected R, but found I" with local generic extension property called on Int receiver
• KT-29595 NoClassDefFoundError with inline reified function with lambda argument returning anonymous object
• KT-29802 Incorrect reification when the same type parameter name is used for different reified types
• KT-30041 "AnalyzerException: Expected an object reference, but found ." on nested suspend function calls outer suspend function
• KT-30066 Consider adding annotations to ConeKotlinType
• KT-30280 Inline class class literal gets unwrapped in annotation arguments
• KT-30402 Constant folding works incorrectly with unsigned arithmetics
• KT-30548 "java.lang.IndexOutOfBoundsException: Cannot pop operand off an empty stack" while compiling access to a private lateinit companion field
• KT-30629 java.lang.VerifyError: Bad type on operand stack when using a function reference to a generic property
• KT-30933 Inline function produces IllegalAccessError on property reference from different package
• KT-31136 "AnalyzerException: Argument 1: expected R, but found I" on x::javaClass when x is inline class object built around primitive type
• KT-31227 Prohibit using array based on non-reified type parameters as reified type arguments on JVM
• KT-31592 NoSuchMethodException when inlining public function accessing a protected static Java class member
• KT-31727 Object expression captures all variables used in constructor
• KT-32023 "AnalyzerException: Expected I, but found R" with inline suspend function used with callable reference
• KT-32115 NPE during initialization of enum class with delegated property
• KT-32153 "AnalyzerException: Expected an object reference, but found ." with recursive suspend local function
• KT-32351 ClassNotFoundException for anonymous object implementing interface inside a lambda with data class and inline methods
• KT-32384 Safe cast to generic type argument with inline class upper-bound throws NPE instead of ClassCastException
• KT-32579 java.lang.VerifyError: Bad type on operand stack on calling inner class of inherited class in super class when casting to inherited class
• KT-32749 "VerifyError: Call to wrong method" with inline function and accessing class field from anonymous object
• KT-32793 Generated code crashes by ClassCastException with local suspend function and inline class
• KT-32812 "AnalyzerException: Argument 1: expected R, but found I" invoking function with default parameter inherited by inline class
• KT-32821 Missing unboxing of inline class for complex hierarchy of suspend calls
• KT-33155 ClassNotFoundException for qualified this in anonymous object and as a result of inline function call
• KT-33173 Internal error: "AnalyzerException: Expected I, but found R" for supercall inside inline lambda from HashSet.remove implementation
• KT-33577 NoSuchFieldError with nested anonymous objects accessing outer instance property
• KT-33836 Wrong code generated for a local tailrec suspend function.
• KT-33873 ClassCastException invoking UByte setter function via reflection
• KT-34018 "Cannot pop operand off an empty stack" with inline lambda with callable reference
• KT-34186 JDK11: class file contains malformed variable arity method for vararg sealed class constructor
• KT-34202 IllegalAccessError on callable reference of function from multifile facade from standard library
• KT-34255 @JvmStatic tailrec function: "Cannot pop operand off an empty stack"
• KT-34507 Incorrect generated code for mutable collection stub methods in case of presence of functions with similar signature
• KT-34665 Possible index overflow in optimized "for" loop over withIndex()
• KT-34754 Flow builder: "AnalyzerException: Expected an object reference, but found ." with recursive suspend local function
• KT-34816 "AnalyzerException: Expected an object reference, but found I" on "this" in inline class member extension suspend function
• KT-34841 ClassNotFoundException when invoke param function inside anonymous object method
• KT-35008 "AnalyzerException: Expected an object reference, but found I" in inline class companion calling private constructor
• KT-35166 NoSuchMethodError at runtime with local property delegate on anonymous object referencing another anonymous object
• KT-35224 It's possible to pass non-spread arrays after arguments with SAM-conversion
• KT-35301 MethodInliner fails with "AssertionError: call doesn't correspond to object transformation info" for qualified this in SAM constructor used as parameter of anonymous object inside inline lambda
• KT-35419 Failed to generate expression: KtNamedFunction for local suspend tailrec function with receiver
• KT-35511 VerifyError: "Bad type on operand stack" after reification
• KT-35553 Kotlin compiler generates methods that always have line number 1 for Inline Classes
• KT-35725 "AssertionError: Couldn't find a context for a super-call" for super member call in property initializer of companion object
• KT-36420 ClassCastException with inline class Foo extending generic Comparable
• KT-36713 AnalyzerException: "Incompatible stack heights" with suspend and inline suspend functions
• KT-36794 Move $assertionsDisabled field to the top-level class
• KT-36853 IR: UninitializedPropertyAccessException on tailrec with object expression in default argument
• KT-36875 "RuntimeException: Trying to access skipped parameter" on synthetic local variable access from inline function
• KT-36916 AnalyzerException: Argument 1: expected I, but found R when using inline class with rxjava
• KT-36957 Exception during codegen: cannot pop operand off an empty stack (Nothing variable in string interpolation)
• KT-36984 SAM adapter classes should be generated as anonymous inner classes in JVM_IR
• KT-37704 Incorrect SMAP syntax
• KT-37716 "AssertionError: call doesn't correspond to object transformation info" with inline reified type parameter, anonymous object and lambda in constructor call
• KT-37972 IllegalAccessError on initializing property reference for a property declared in JvmMultifileClass with -Xmultifile-parts-inherit
• KT-38100 Support local delegated properties (not inlined) in new JVM default modes
• KT-38833 JVM: java.lang.ClassCastException when loop variable is nullable in for loop over unsigned progression
• KT-38849 Read-only variable initialized in non-inline lambda using contract callsInPlace EXACTLY_ONCE is not captured correctly in nested lambdas
• KT-38869 JVM BE produces invalid bytecode when inheriting from AbstractList and declaring methods that look like MutableList implementors (but they aren't)
• KT-38965 "UnsupportedOperationException: Don't know how to generate outer expression: Closure" with reference to local variable in block argument of anonymous object by delegation
• KT-39289 CCE in if-else inside annotated 'if' statement
• KT-39425 AbstractMethodError: "Receiver class does not define or inherit an implementation of the resolved method" using classes with complex Java and Kotlin inheritance hierarchies.
• KT-39434 IllegalAccessError with local delegated property in lambda in inlined function
• KT-39687 "Couldn't find captured this" when more than 3 inline functions are nested
• KT-39784 "IndexOutOfBoundsException: Cannot pop operand off an empty stack" caused by JvmOverloads annotation inside an inline class
• KT-40165 ClassCastException caused by SAM conversion used on a functional interface with suspended function
• KT-40179 "VerifyError: Bad type on operand stack" with parent class get extension function and child class set extension function which used inside child class plusAssign extension function
• KT-40277 Fix generic types in special bridge methods
• KT-40308 NoSuchFieldError for multiple delegated extension properties with the same name in a companion object
• KT-40338 NoSuchFieldError on property without backing field that is called as function reference
• KT-40392 Deprecate JvmDefault annotation and old -Xjvm-default modes
• KT-40396 NI: Exceptions when ambiguous type argument and generic invoke
• KT-40510 "AssertionError: DELEGATION slice must override something" for ByteBuffer delegation
• KT-40601 VerifyError: "interface method reference is in an indirect superinterface" when calling @JvmDefault suspend method
• KT-40809 "Couldn't find captured field" compiler error with local function with recursive call through method reference
• KT-41056 Increase stub version due to new "contract" keyword
• KT-41105 IllegalStateException: 'Couldn't find declaration file ' with inline delegate declared in another file
• KT-41165 "IllegalStateException: Concrete fake override public final fun" when an enum class inherits an interface with a variable 'name' or 'ordinal'
• KT-41222 "IllegalStateException: Concrete fake override public final fun" when a class property is inherited as merged 'var' from 'val' and 'var' from parent abstract class and interface properties
• KT-41255 JDK 11: "VerifyError: Bad type on operand stack" with long function body with annotated when expression
• KT-41427 NoSuchMethodError caused by implementation by delegation to function reference
• KT-41508 ClassNotFoundException caused by object with overridden function inside a lambda with safe cast receiver
• KT-41750 Inline classes: ClassCastExceptionError when calling .withIndex() on Iterator over Array
• KT-41758 Deprecate kotlin.Metadata.bytecodeVersion and avoid using it in the compiler
• KT-41770 AssertionError: "Asm parameter types should be the same length as Kotlin parameter types" cause by fun interface
• KT-41874 "IllegalStateException: Couldn't obtain compiled function body" on extension delegated property with inline operator getValue in a different file
• KT-41917 [FIR] Incorrect calculating property type for override from intersection scope
• KT-42012 IllegalAccess to protected field instead of getter
• KT-42017 "AssertionError: Unsigned type expected: UInt?" during codegen when a variable of nullable unsigned type is checking for presence in the range
• KT-42032 "AnalyzerException: Expected I, but found R" while using Flow.reduce() with suspend function reference
• KT-42034 ArrayIndexOutOfBoundsException in PopBackwardPropagationTransformer on external override of function in inline class
• KT-42064 "Parameter specified as non-null is null" with default value of the parameter in operator fun
• KT-42069 JVM IR: -Xreport-output-files doesn't report any source files for META-INF/*.kotlin_module files
• KT-42083 AbstractMethodError when 'remove' with irrelevant generic parameter but matching JVM signature is present in Kotlin collection class
• KT-42092 JVM / IR: "AnalyzerException: Argument 1: expected R, but found J" when trying to add to ArrayList the result of a function applied to int
• KT-42175 Psi2ir: "AssertionError: Undefined parameter referenced: " on augmented assignment on this in a BuilderInference lambda
• KT-42179 Platform declaration clash when extending abstract Java class implementing 'java.util.Collection' by abstract Kotlin class implementing Kotlin Set or List
• KT-42321 JVM IR: do not cast integer value based on the type of a literal receiver of an operator call
• KT-42337 NoSuchMethodError in JVM backend with inheritance of private functions in the interface
• KT-42404 "Supertypes of the following classes cannot be resolved" in Rider project
• KT-42472 No TYPE_INFERENCE_UPPER_BOUND_VIOLATED for Delegated Properties do not check types (in Kotlin 1.4.10)
• KT-42487 "IndexOutOfBoundsException: Cannot pop operand off an empty stack" caused by USELESS_IS_CHECK of Double type
• KT-42533 (N until MIN_VALUE).reversed() should be an empty progression in for loops
• KT-42588 "IllegalStateException: Concrete fake override public open fun" caused by val override with var with delegation.
• KT-42634 Different bridges and abstract stubs behavior in abstract class implementing Map<K, String> in JVM and JVM_IR
• KT-42635 ClassCastException with inline class in for loop
• KT-42662 AbstractMethodError when using partially specialized generic Map class
• KT-42694 @get:Synchronized causes the JVM getter method not to be generated
• KT-42753 "VerifyError: Bad invokespecial instruction: interface method reference is in an indirect superinterface" with jvm-default=all
• KT-42879 JVM: Declaration clash in fun interface implementation returning an inline class
• KT-42900 "VerifyError: Bad return type" incorrect bytecode when a property and an extension property in inline class have the same names
• KT-42946 FIR2IR: Fix super-calls to Java overrides of special built-in
• KT-42971 JVM: "AssertionError: Unsigned type expected: T" with UInt loop range
• KT-42990 "AssertionError: Next value after NEW should be one generated by DUP" caused by extension properties with accessors annotataed as @JvmStatic
• KT-43034 AssertionError: Compiler fails with complicated tailrec + inline case
• KT-43048 JVM_IR: Implement coroutines state clearing
• KT-43050 JVM IR: incorrect mangling for method with type parameter with inline class bound in the signature
• KT-43059 Different bridges behavior in class implementing Map<String, String> in JVM and JVM_IR
• KT-43063 Redundant DefaultImpls delegate is generated in old JVM backend on explicit "duplicate" inheritance from interface
• KT-43069 JVM: incorrect generic signature for method with implicit return type Nothing overriding a method from Collection
• KT-43099 Tailrec call in not tail-call position leads to internal compiler error
• KT-43106 JVM: custom remove in Iterator subclass results in a synthetic bridge
• KT-43120 JVM: "Expected an object reference, but found ." caused by function which is passed as reference to suspend parameter
• KT-43167 JVM IR, serialization: "No mapping for symbol: VALUE_PARAMETER INSTANCE_RECEIVER" with data class containing property defined in body
• KT-43255 Verify error when inheriting from an abstract class implementing Collection with stub-like method in superclass
• KT-43303 NI: False negative TYPE_INFERENCE_UPPER_BOUND_VIOLATED when inferred type argument is not a subtype of type parameter upper bound
• KT-43333 AbstractMethodError when calling 'toArray' from Java on a Kotlin Collection with custom internal 'toArray'
• KT-43334 AbstractMethodError when calling 'remove' from Java on a Kotlin Collection with custom internal 'remove'
• KT-43342 [FIR2IR] No getter or backing field found for delegated member call
• KT-43347 [FIR] Synthetic setter with unmatched parameter type isn't found
• KT-43401 JVM_IR. Additional synchronized flag on JvmOverloads-generated adapter for Synchronized function
• KT-43405 Turkish locale, Linux Mint: "NoSuchMethodError: 'int[] kotlin.jvm.internal.Intrinsics$Kotlin.intArrayOf(int[])'" with intArrayOf function call
• KT-43460 JVM: redundant private setter is generated in case of multifile facade
• KT-43473 "VerifyError: Bad type on operand stack" caused by operator get with optional argument in superclass when called via square brackets on subclass
• KT-43518 JVM_IR. Additional strictfp flag on JvmOverloads-generated adapter for Strictfp function
• KT-43569 FIR: inapplicable candidate(s): kotlin/collections/set
• KT-43616 [FIR] Nullable type parameter-based type after merge in if
• KT-43669 FIR: No real overrides for FUN IR_EXTERNAL_DECLARATION_STUB
• KT-43682 Inline extension method of a multifile library inline class not found
• KT-43687 FIR: UnusedChecker does not take annotation arguments into account
• KT-43688 FIR: unused checker doesn't handle invokes properly
• KT-43749 "UnsupportedOperationException: Don't know how to generate outer expression: Closure" caused by Flow and collect method with function reference as a parameter
• KT-43812 JVM IR: SAM wrapper class with generic supertype mentions missing type parameter in the signature
• KT-43832 JVM IR: missing bridges for inheritance of class from interface in a complex generic diamond hierarchy
• KT-43851 JVM IR: function call returning object instance is removed during constant propagation
• KT-43864 JVM: "Assertion error after mandatory stack transformations: incorrect bytecode" with lateinit property of type T, which has a primitive type upperbound
• KT-43887 Problem with FunctionReferenceLowering$FunctionReferenceBuilder in kotlin native
• KT-43912 JVM internal error: Augment assignment and increment are not supported for local delegated properties and inline properties
• KT-43915 Back-end (JVM) Internal error: wrong bytecode generated for default method
• KT-43938 NSME when calling 'kotlin.Number' methods on instance of Java class extending Kolin abstract class extending 'kotlin.Number'
• KT-43942 org.jetbrains.kotlin.codegen.CompilationException: Back-end (JVM) Internal error: Failed to generate function
• KT-43949 FIR: unresolved callable reference as lambda return
• KT-43983 IllegalStateException: "Couldn't obtain compiled function body for public final suspend inline fun" after moving inline extension function to library
• KT-43984 FIR: recursion in overridden symbols
• KT-43984 FIR: recursion in overridden symbols
• KT-44010 FIR: Inapplicable constructor due to an unresolved reference
• KT-44030 FIR2IR: uncached type parameters in delegated property
• KT-44032 FIR2IR: uncached type parameters in Java field
• KT-44050 FIR: anonymous object as IR parent
• KT-44054 FIR2IR: incorrect IR origin for substituted override function
• KT-44058 CompilationException: open suspend fun with @JvmStatic in open class companion
• KT-44069 please remove deprecated usages
• KT-44066 FIR Java: override ambiguity with vararg value type
• KT-44114 CompilationException when inlining a extension suspend function declared in interface companion with 'this' reference to extension receiver
• KT-44131 "UnsupportedOperationException: Don't know how to generate outer expression: Closure" when using suspend lambda and a function reference
• KT-44140 JVM IR: compilation of kotlin.Result crashes with IOOBE while generating toString-impl
• KT-44141 JVM IR: "ISE: There should be underlying type for inline class type" on usage of type parameter with Result upper bound inside a lambda
• KT-44192 Allow a greater number of constants in an enum class
• KT-44202 "ClassCastException" when getting delegated property with inline class and Any/Any? type
• KT-44210 KJS / IR: "AssertionError: Undefined parameter referenced: defined" caused by plus assign operators in build blocks
• KT-44233 [IR] Collection Stub generation not correctly considering java.util Collection iterators
• KT-44234 Private companion property with explicit setter generates invalid bytecode
• KT-44269 "[TAILREC_ON_VIRTUAL_MEMBER_ERROR] Tailrec is not allowed on open members" with Spring annotation and private tailrec function
• KT-44284 Make Kotlin binaries publicly unavailable (set KotlinCompilerVersion.IS_PRE_RELEASE = true)
• KT-44316 ReenteringLazyValueComputationException when analyzing complex lazy delegate
• KT-44347 Back-end (JVM) Internal error: Couldn't transform method node for suspend function with wrong local for Continuation
• KT-44368 "IllegalStateException: Error type encountered" when inlining 'invoke' operator without enough information on type variable
• KT-44412 JVM IR backend fails to compile break in condition of do while
• KT-44420 False NULLABILITY_MISMATCH_BASED_ON_JAVA_ANNOTATION with 1.4.30-RC
• KT-44429 JVM IR: unnecessary integer unboxing leads to NPE when using mockito-kotlin
• KT-44439 Type inference of generic types failing java interop
• KT-44440 Too many Nothings in inferred type
• KT-44471 Fix failing script tests after switching to 1.5
• KT-44474 Compiler expects sealed type inheritors from platform specific source-sets in when expression in common source-set
• KT-44483 JVM IR: CCE on calling generic vararg function reference with Array expected type
• KT-44527 Suspend function with kotlin.Result: ClassCastException class kotlin.Result cannot be cast to class ...
• KT-44529 Inline class calls wrong iterator method in for loop
• KT-44533 JVM IR: ClassFormatError on synthetic $suspendImpl method generated in interface for a @JvmDefault function
• KT-44540 Regression in 1.4.30 in intellij-community: type mismatch for generic function call with generic Java class
• KT-44546 NI: changed variable fixation order (that can lead to changed resolution)
• KT-44550 KotlinBinaryClassCache leaks Kotlin plugin classloader on plugin unload
• KT-44563 Type Inference loosing type annotations in lambda type expectation for function calls with block parameters
• KT-44583 "Supertypes of the following classes cannot be resolved" error message gives no context
• KT-44627 JVM IR: ACCIDENTAL_OVERRIDE when overriding a generic field where the type parameter has a primitive bound
• KT-44631 "IndexOutOfBoundsException: Cannot pop operand off an empty stack" caused by a default param in inner class constructor which uses method or field from receiver
• KT-44647 "IllegalAccessError: class TestKt tried to access private method" with String Builder get and inc operator
• KT-44651 JVM / IR: "IllegalStateException: Illegal type substitutor" with if-else inside class constructor argument inside another if-else
• KT-44660 Internal inline functions in companion object with inline class return type fails compilation
• KT-44671 JVM_IR: ClassCastException: Result$Failure cannot be cast to Result with multithreaded coroutines
• KT-44703 JVM / IR: "IllegalStateException: Unhandled special name in mangledNameFor" caused by a reference to inline class inside interface's companion with lazy initialization
• KT-44712 JVM / IR: Behavior change after enabling with Mockito
• KT-44714 Debugger / Coroutines: Local variables are trimmed out too aggressively
• KT-44722 JVM IR: ClassCastException with inline class, let and bound function reference
• KT-44726 JVM IR: Incorrect KType nullability for platform type reified as non-null
• KT-44781 JVM IR: java.lang.NoSuchFieldError: $noName_0 when calling a crossinline lambda within a suspending lambda
• KT-44798 JVM IR: Inherited platform declarations clash for class implementing both List and Set
• KT-44801 1.4.30 JVM IR: Unbound symbols not allowed with anonymous object
• KT-44803 FIR bootstrap: incorrect nullability is set for type alias-based type
• KT-44827 Non-existing outer class is written in anonymous class for SAM wrapper in inline lambda with capture
• KT-44837 JVM / IR: ClassCastException with Result object when it is used by a generic method in a suspend call
• KT-44875 JVM_IR. hashCode call is generated on interface target in fun interface equality
• KT-44878 JVM_IR: "IllegalStateException: Unexpected types" when checking non-nullable variable is in range between nullable ones with smart-cast
• KT-44926 MPP: Actual typealias to compiled inline class incompatible with expect inline class
• KT-44947 Sealed interfaces: Sealed fun interface leads to "NoWhenBranchMatchedException"
• KT-44993 JVM IR: VerifyError on getfield with Kotlin generic field and elvis operator
• KT-45008 JVM IR: hashCode is generated as invokeinterface if smart cast to interface is present
• KT-45011 JVM / IR: "AssertionError: Unbound symbols not allowed"
• KT-45022 IR: "AssertionError: Undefined variable referenced" from psi2ir caused by plusAssign operator of object
• KT-45064 JVM IR: "java.lang.AssertionError: SyntheticAccessorLowering should not attempt to modify other files!" with member reference to property in another file with private setter
• KT-45067 "IllegalArgumentException: Wildcard mast have a bound for annotation of WILDCARD_BOUND position" with BEAM SDK 2.27
• KT-45069 JVM / IR: New SAM conversions mode fails when converting from Unit to Any
• KT-45131 JVM / IR: "RuntimeException: Lambda, SAM or anonymous object should have only one constructor" caused by inline class that type cast to reified type parameter inside lambda in inline function
• KT-45139 Inline class: AssertionError: Expected top level inline class
• KT-45166 JVM / IR: "AbstractMethodError: Receiver class does not define or inherit an implementation of the resolved method of interface" caused by interface with suspend function
• KT-45187 JVM / IR: ClassCastException caused by substituting generic type of vararg parameter with java.lang.Void
• KT-45195 JVM IR: annotation methods are generated as default interface methods if allopen is used
• KT-45243 "IllegalStateException: Lambdas shouldn't be visited by ESExpressionVisitor" caused by lambda inside kotlin.test.assertNotNull
• KT-45259 JVM: ClassCastException caused by Result as lambda parameter type
• KT-45292 AssertionError with recursive inline extension property
• KT-45300 Deprecate super calls in public-api inline functions
• KT-45409 Rename jspecify annotations’ package and default not null annotation
• KT-45446 JVM / IR: NullPointerException caused by unreachable code and comparison
• KT-45721 JVM / IR: "Unbound symbols not allowed" caused by class reference in sequence lambda
• KT-45853 JVM / IR: "Accidental override" caused by inheriting Throwable.getCause from Java interface
• KT-45861 Turning warnings into errors for calls with type parameters annotated by @OnlyInputTypes
• KT-45865 JVM IR: "VerifyError: Bad type on operand stack" with enumValueOf on a value from a list of strings
• KT-45868 JVM IR: ClassCastException with SAM function in init block when SAM is generated via invokedynamic
• KT-45920 JVM IR: "Accidental override" on redefining get() in custom Map class
• KT-45934 JVM IR: "java.lang.IllegalStateException: Function has no body" for class implementing interface by delegation
• KT-45945 JVM / IR: "AssertionError: Unexpected variance in super type argument" with contravariance and intersection types
• KT-45963 JVM / IR: "AbstractMethodError: Receiver class does not define or inherit an implementation of the resolved method" in Dokka tests
• KT-45967 JVM IR: "IllegalAccessError" with invokedynamic to Java SAM over callable reference to private function
• KT-45982 Wrong subtyping result on captured types with postponed type variables
• KT-46007 JVM / IR: "ClassCastException: kotlin.Unit cannot be cast to java.lang.String" caused by default suspend function in interface
• KT-46060 JVM IR: NullPointerException from RangeContainsLowering when contains is a @JvmStatic function in object
• KT-46069 JVM IR: unbound type parameter on generic bound adapted function reference
• KT-46092 JVM IR: AssertionError "Array type expected: @[FlexibleNullability] kotlin.CharArray?" on super call to Java constructor with primitive vararg
• KT-46104 The message on inline -> value class migration should not say that inline classes are deprecated
• KT-46131 Kotlin 1.5.0-RC errors when reading class file
• KT-46160 JVM IR: IllegalAccessException at runtime for member reference to JvmMultifileClass member from stdlib
• KT-46186 Type inference regression in Kotlin 1.5 with constrained generic return types

Docs & Examples

• KT-45884 Incorrect description for JVM toUpperCase method

IDE

• KT-33233 Use dependency of library to build built-ins in IDE, instead of loading them from the current classloader
• KT-34023 kotlin.KotlinNullPointerException at org.jetbrains.kotlin.backend.common.FunctionsFromAnyGenerator.getPrimaryConstructorProperties(FunctionsFromAnyGenerator.kt:66)
• KT-35947 KFunctionN.call is unresolved in IDE in Kotlin/JVM project
• KT-37702 Code analysis speed: on-the-fly analysis diagnostics reporting
• KT-41048 [FIR-IDE] Properly implement methods in KtFirPackageScope
• KT-41671 Missing nullability information in properties using type inference from get()
• KT-43824 KtLightClassForSourceDeclaration#isInheritor works in a different way than java implementation
• KT-44128 IDE: Kotlin JVM record has incorrect property accessors as seen from Java
• KT-44487 MPP, IDE: No error in IDE when sealed class inheritor from common source-set is not used in exhaustive when expression in platform source-set
• KT-45254 Highlighting for files with certain errors appears only on second opening
• KT-46097 Light classes: Incomplete nullability information for a getter method of a kotlin property defined in private constructor

IDE. Decompiler, Indexing, Stubs

• KT-43699 IDE: Unresolved extension method from Java code for simple class with typealias and generics (IllegalStateException: Unknown type parameter)
• KT-44756 Infinite "UpToDateStubIndexMismatch: PSI and index do not match." with IDEA 2021.1 EAP upon attempt to open "org.gradle.configurationcache" even they seem to be the same

IDE. Gradle Integration

• KT-37127 Implement precise importing of platforms of root source sets (commonMain/commonTest) when hierarchical multiplatform support is enabled
• KT-42048 KJS / Gradle integration: Could not determine the dependencies of task ':webApp:testPackageJson' in Android Studio 4.2 Canary 11

IDE. Gradle. Script

• KT-46215 Dead lock on closing project during the import in IJ211 through ScriptDefinitionsManager

IDE. Inspections and Intentions

• KT-23824 Return lifted out of if condition causes suspend tail call optimization to no longer apply
• KT-38155 Lift assignment out of 'if' produces type mismatch without manually adding a semicolon
• KT-44821 IDE: False positive NO_ELSE_IN_WHEN caused by sealed class and when in another module
• KT-46088 [IDEA] Incorrect behavior of replace inline class with value class intention

IDE. Misc

• KT-44675 Incorrect reference to resource into 202 plugin

IDE. Refactorings

• KT-44079 Sealed Interfaces: Move refactoring should warn about violation of hierarchy restrictions
• KT-44839 Sealed interfaces: move refactoring warnings works with "more freedom for sealed classes" rules for language level < 1.5

IDE. Script

• KT-43288 Allow push notifications about script configuration /dependencies changes via the ScriptDefinitionsProvider EP

JavaScript

• KT-39272 KJS / IR: Can't use javascript keywords as JsName
• KT-41650 JS IR BE: default should be a reserved identifier
• KT-42176 KJS / IR: Interface default method in sub-interface not resolved correctly from extension on super-interface
• KT-44103 [JSIR] TypeError when bumping from 1.4.20 to 1.4.30-M1
• KT-44180 KJS / IR: NPE in ConstTransformer of compileDevelopmentExecutableKotlinJs/compileProductionExecutableKotlinJs tasks
• KT-44415 Kotlin/JS with IR and kotlin-react: "too much recursion" error in runtime in browser
• KT-44433 KJS IR: support function interfaces with suspend member
• KT-44469 KJS / IR: Incorrect export functions with bridges
• KT-44718 MPP/ KJS: "IllegalStateException: Unsupported operation" with serialization plugin and incremental compilation
• KT-44796 KJS / IR: default parameter of function with @JsName leads to "RangeError: Maximum call stack size exceeded"
• KT-45059 KJS / IR: Add possibility for runtime diagnostics of DCE result

Libraries

• KT-12109 Add stdlib method that combines mapNotNull() and first/firstOrNull()
• KT-25571 Make random implementations serializable
• KT-26234 Floored division and remainder function for numeric types
• KT-32996 kotlin.test: add assertContentEquals for comparing content of arrays, iterables, sequences
• KT-39177 Make CharCategory available in common multiplatform code
• KT-40225 Support adding kotlin-test as a single dependency, as it should be with a multiplatform library
• KT-42071 Strict version of String.toBoolean()
• KT-42720 Kotlin ArrayDeque on JVM: provide optimized toArray method
• KT-42840 Commonize and generalize String.contentEquals that is currently JVM-only
• KT-43772 Kotlin/Native unfinished workers detected.
• KT-44168 Prevent storing NaN and negative zero in kotlin.time.Duration
• KT-44369 Commonize Char.titlecaseChar() and Char.titlecase() that are currently JVM-only
• KT-44783 Add IS_VALUE flag for value classes to kotlinx-metadata-jvm
• KT-44815 Remove kotlin-annotations-android and JVM compiler support for @ParameterName/@DefaultValue/@DefaultNull
• KT-45213 Update Unicode version used in K/N for Char and String case conversion functions

Middle-end. IR

• KT-43831 Compilation failed, IrSimpleFunctionPublicSymbolImpl is already bound
• KT-44100 KJS / IR: Top level declarations added in IR plugin are not referenceable from other modules
• KT-45170 IR: "AssertionError: Single expression value for GET_OBJECT" caused by inc operator of field inside scope function inside object

Native

• KT-42446 Native: SIGSEGV in Kotlin_Array_get on linuxArm64
• KT-43502 [K/N] relocation R_X86_64_PC32 cannot be used against symbol __environ; recompile with -fPIC
• KT-44295 1.4.21 Kotlin native ndk compiler crash
• KT-44774 ld fails with CALL16 reloc at 0x48f00 not against global symbol (Linux MIPS)
• KT-44746 Different hashCode() results for Kotlin/Native stdlib

Native. C and ObjC Import

• KT-44824 cinterop tool no longer appends .klib to produced klibs

Native. C Export

• KT-36639 MPP: Build ios "staticLib" or "sharedLib" binary failed if interface contains member extension function
• KT-41725 Dynamic library doesn't load on raspberrypi

Native. ObjC Export

• KT-44549 In the Xcode debug session, call stack is missing a frame when the iOS app fails

Native. Platforms

• KT-45094 Fail to compile Kotlin Native sources under Oracle Linux 7

Reflection

• KT-44594 Avoid using unnecessary array types reflection in kotlin-reflect
• KT-44782 Add KClass.isValue to kotlin-reflect

Tools. Ant

• KT-16227 Ant task: do not include runtime by default if destination is a jar
• KT-44293 Support fork mode in kotlinc Ant task

Tools. CLI

• KT-17344 Include kotlin-reflect to resulting jar if "-include-runtime" is specified
• KT-43220 -include-runtime should add .kotlin_builtins to the output
• KT-43704 Illegal reflective access by com.intellij.util.ReflectionUtil to method java.util.ResourceBundle.setParent(java.util.ResourceBundle)
• KT-44078 Do not include module-info.class of kotlin-stdlib.jar to the resulting jar with -include-runtime
• KT-44232 CLI: do not pass -noverify to java process starting from JDK 13
• KT-45566 JDK 16 - e: java.lang.NoClassDefFoundError: Could not initialize class org.jetbrains.kotlin.com.intellij.pom.java.LanguageLevel

Tools. CLI. Native

• KT-43874 Native / CLI: provide a way to show difference between Jvm and Native compilers

Tools. Compiler Plugins

• KT-45783 Serialization: "AnalyzerException: Expected an object reference, but found I" caused by JvmInline and Serializable annotations

Tools. Gradle

• KT-31027 java.lang.NoSuchMethodError: No static method hashCode(Z)I in class Ljava/lang/Boolean; or its super classes (declaration of 'java.lang.Boolean' appears in /system/framework/core-libart.jar)
• KT-43605 Kotlin Gradle Plugin 1.4.20 undeclared system property reads cause problems with Gradle configuration cache enabled
• KT-44204 Kotlin Gradle Plugin 1.4.21 makes impossible to use ANTLR in other plugins
• KT-44361 Gradle: deprecate options includeRuntime, noStdlib, noReflect
• KT-44462 Kotlin Gradle plugin creates compile configuration with Gradle 7.0
• KT-44834 Gradle Kotlin DSL: Add languageSettings configuration lambda without apply call
• KT-44949 Compatibility with Gradle 7.0
• KT-44957 gradle - target.compilations seems to be deprecated
• KT-45340 Update minimal supported version of Kotlin Gradle Plugin to 6.1

Tools. Gradle. JS

• KT-43237 KJS: -jsLegacy Naming Convention is incompatible with NPM
• KT-43869 Error in webpack configuration not displayed
• KT-44614 Update Node.JS and Yarn versions
• KT-44616 Kotlin/JS: IR backend with React: "Uncaught TypeError: _this__0 is undefined" runtime error in browser
• KT-45574 Sync Kotlin/JS compile tasks into one folder (build/js/packages//kotlin)

Tools. Gradle. Multiplatform

• KT-42098 Commonizer is re-launched for every included Gradle build
• KT-43116 Merge together MultiplatformHighlightingTest and MultiplatformAnalysisTest
• KT-44322 KotlinTargetComponent maintenance for -sources.jar
• KT-44900 Support gradle configuration cache with kotlin.multiplatform plugin

Tools. Gradle. Native

• KT-46122 kotlinx-serialization and kotlinx-datetime can't be built with 1.5.0-RC

Tools. JPS

• KT-13631 Compilation fails on Turkish locale because of locale-sensitive uppercasing
• KT-44644 Mark all @JvmMultifileClass parts compiled in the previous round as dirty in the JPS plugin, similarly to how it’s done in the Gradle plugin

Tools. Scripts

• KT-45194 KT: Generate Kotlin Entities script: it doesn't work
• KT-44580 Scripts: Unable to set new file annotation hooks after first snippet compilation

Tools. kapt

• KT-43686 KaptWithoutKotlincTask should use @CompileClasspath for kotlinStdlibClasspath for cache relocateability.
• KT-44130 KAPT changes field order in 1.4.30-M1
• KT-44909 Kapt: ReenteringLazyValueComputationException without stacktrace caused by when expression with sealed class function without explicit return type
• KT-45168 KAPT: Java stubs generated for Kotlin files generated by annotation processors

Recent ChangeLogs:

ChangeLog-1.4.X

ChangeLog-1.3.X

ChangeLog-1.2.X

ChangeLog-1.1.X

ChangeLog-1.0.X