ChangeLog.md

1.6.20-RC

Compiler

KT-51302 Kotlin/Native 1.6.20-M1 compiler fails because of assertion in NativeAnnotationImplementationTransformer
KT-51148 “AssertionError: At this stage there should be no remaining variables with proper constraints” caused by two type parameters
KT-50970 Kotlin/Native: use arm instruction set instead of thumb-2 for iosArm32 and watchosArm32 targets
KT-50843 Kotlin/Native: LLVM constant merge pass does not work for Kotlin constants
KT-51157 JVM / IR: “IndexOutOfBoundsException: Index: 1, Size: 1” caused by interface hierarchy and UInt method parameter
KT-50498 Exception after analysing an erroneous lambda
KT-51062 Progressions resolve changing warning isn't reported for Java methods
KT-51040 Type inference fails on 1.6: “Cannot use ‘CapturedType(*)’ as reified type parameter” with EnumSet and elvis operator
KT-51022 Fix error messages for resolution ambiguity with stub types

Native

KT-51359 Native: the compiler doesn't work on macOS 12.3 Beta

Native. Runtime. Memory

KT-50879 Kotlin/Native: Stabilize Concurrent Sweep GC
KT-50948 Kotlin/Native: Concurrent Sweep GC hangs on Windows in GCStateHolder::waitEpochFinished/waitScheduled

Tools. Android Extensions

KT-50784 kotlin-android-extensions produces unbound symbol under _$_findViewCache

Tools. CLI

KT-51309 Add JVM target bytecode version 18
KT-51025 JVM CLI compiler takes class file from classpath instead of input java source file

Tools. Daemon

KT-47522 Provide reasonable resolution strategy for OutOfMemoryError during compilation
KT-51116 OOM user-friendly message isn't displayed if there is main exception caused by out of memory

Tools. Gradle

KT-51177 After updating from KGP 1.5.30 to 1.6.10, KotlinCompile is non-incremental given an Android resource change
KT-50719 Kotlin Gradle Plugin may hang on writing statistics
KT-48849 Cache miss due to empty directories in KotlinCompile inputs

Tools. Gradle. JS

KT-51060 KJS / IR: Incorrect order of libraries with IC
KT-50930 KJS / IR: Incremental compilation cache building not consider multiple artifacts

Tools. Gradle. Multiplatform

KT-50592 [Gradle][MPP] Mitigate isolated KGP classpath issues
KT-51176 CInteropCommonization: Warn users about disabled cinterop commonization when cinterops are present in hmpp

Tools. Gradle. Native

KT-49330 commonizeNativeDistribution: “ClassCastException: KotlinJvmProjectExtension_Decorated cannot be cast to class org.jetbrains.kotlin.gradle.dsl.KotlinProjectExtension”

Tools. Kapt

KT-48402 Kapt throws “Fatal Error: Unable to find package java.lang in classpath or bootclasspath” with JDK 16 and Kotlin 1.5.30
KT-48450 Allow to configure additional jvm arguments for 'KaptWithoutKotlincTask`
KT-41456 Kotlin compilation failure after successful kapt causes invalid incremental builds

1.6.20-M1

Compiler

New Features

KT-48217 Add an annotation JvmDefaultWithCompatibility to allow generating DefaultImpls classes if -Xjvm-default=all option is used
KT-49857 Require Xcode 13 for building Kotlin/Native compiler
KT-47701 Support instantiation of annotation classes on Native
KT-46085 Support experimental parallel compilation of a single module in the JVM backend
KT-46603 Generate SAM-conversions to Java interfaces extending ‘java.io.Serializable’ as serializable using java.lang.invoke.LambdaMetafactory

Performance Improvements

KT-50156 HMPP: Slow frontend/ide performance in OKIO (ExpectActualDeclarationChecker)
KT-50073 Performance regression in adapted function references
KT-50076 Performance regression in super call to an interface member in $DefaultImpls
KT-50080 Performance regression in string template with generic property with primitive upper bound
KT-50084 Performance regression in concatenation with ‘String?’
KT-50078 Performance regression in for-in-array loop
KT-50039 Performance regression in inner class constructor call with default parameters
KT-48784 An anonymous class has fields for variables that are only used in the constructor
KT-42010 Generate IINC instruction for postfix increment in JVM_IR
KT-48433 JVM_IR don't generate null check on ‘this$0’ parameter of inner class constructor
KT-48435 JVM_IR ConstForLoopBenchmark performance regression
KT-48507 JVM_IR ForLoopBenchmark regressions
KT-48640 Performance regression in ‘longDownToLoop’ benchmarks
KT-29822 Generate specialized bytecode for loops withIndex over unsigned arrays
KT-48669 Generate optimizable counter loop for loops over indices of unsigned arrays
KT-49444 Possible performance degradation with UInt downTo loop
KT-48944 Possible performance regression with comparison of local KFunctions
KT-17111 Eliminate redundant store/load instructions when the value stored is simple
KT-36837 Generate more compact code for for-in-range loop in JVM_IR
KT-48947 JVM / IR Possible performance regression with string templates
KT-48931 JVM / IR: Performance degradation with string concatenation
KT-36654 Generate more compact bytecode for safe call in JVM_IR

Fixes

KT-48544 JVM / IR: “UnsupportedOperationException: Unknown structure of ADAPTER_FOR_CALLABLE_REFERENCE” with callable reference ::arrayOf
KT-49658 NI: False negative TYPE_MISMATCH on nullable type with when
KT-50978 [Native] Error while building static cache: NoSuchElementException at IrTypeInlineClassesSupport.getInlinedClassUnderlyingType(InlineClasses.kt:341)
KT-50977 [Native] Error while building static cache: IllegalStateException: Class CLASS ENUM_ENTRY is not found at KonanIrlinkerKt.findClass(KonanIrlinker.kt:229)
KT-50976 [Native] Error while building static cache: IllegalStateException: No descriptor found at DescriptorByIdSignatureFinder.findDescriptorForPublicSignature(DescriptorByIdSignatureFinder.kt:157)
KT-51080 Line number in mapping for the first instruction is lost
KT-49526 JVM IR: Function reference with non-denotable intersection type argument is not inlined and is incorrectly approximated
KT-50399 Error: unexpected variance in super type argument: out @0
KT-50649 JVM IR: ClassCastException when returning Result as generic type
KT-50617 JVM IR: java.lang.IndexOutOfBoundsException “Empty list doesn't contain element at index 0” when class and interface have the same name and extension function is used
KT-45693 False negative INCOMPATIBLE_TYPES with when with generic subject
KT-50797 Implement fix for false negative UPPER_BOUND_VIOLATED with generic typealias using not all type parameters as arguments for underlying type
KT-43493 NI: @BuilderInference prevents compilation error of “Operator ‘==’ cannot be applied to ‘Long’ and ‘Int’”
KT-48945 JVM IR: special bridge for get is not generated in a Map subclass
KT-49829 Wrong “cast can never succeed” diagnostic with builder inference
KT-49828 Improve builder inference diagnostics with overload resolution ambiguity
KT-50989 CCE cause by EmptySubstitutor in ResolutionWithStubTypesChecker
KT-48899 Report warnings on overrides with wrong types nullability
KT-49461 Implement prohibitation of access to members of companion of enum class from initializers of entries of this enum
KT-49754 Kotlin/JS: @JsExport on enum class reports NON_EXPORTABLE_TYPE warning
KT-49598 Misleading error message “Using @JvmRecord is only allowed with -jvm-target 15 and -Xjvm-enable-preview flag enabled”
KT-44133 Inline classes: class literal in annotation arguments uses underlying type
KT-47703 ClassCastException: Programmatically created annotation can't hold Array<KClass<*>>
KT-47549 JVM / IR: Null argument in ExpressionCodegen for parameter VALUE_PARAMETER CONTINUATION_CLASS caused by suspend function inside “fun interface” in another file
KT-50120 HMPP: False positive [NO_VALUE_FOR_PARAMETER] for expect function usages
KT-48499 Interface call with an inline/value parameter generates AbstractMethodError after rebuilding the module, but NOT the file.
KT-49864 JVM IR: NoSuchMethodError calling default interface method with inline class return type in -Xjvm-default=all mode
KT-49812 JVM / IR: “java.lang.VerifyError: Bad return type” when using Result type attribute + extension function with same name
KT-49936 Extension property in a data class with the same name as the constructor parameter leads to incorrect component function being resolved and generated
KT-48181 “ISE: Null argument in ExpressionCodegen for parameter VALUE_PARAMETER” on creating instance of kotlin.Metadata
KT-50215 VerifyError caused by missing cast after is check in when
KT-49977 “Parameter specified as non-null is null” when inline class implements interface method with default parameters
KT-50385 DUPLICATE_LABEL_IN_WHEN is reported on incorrect branches
KT-49092 JVM: ArrayIndexOutOfBoundsException on compiling call with if expression and TODO() arguments
KT-48987 JVM / IR: Smartcast, which never succeed, crashes the compiler
KT-49998 JVM: missing default value for annotation parameter of an unsigned type
KT-50277 Invalid bytecode generated for inline lambda in suspend function
KT-44561 FIR DFA: extract non-null info from comparison against variable with initial constant value
KT-44560 FIR DFA: propagate non-null info to original variables in not-null assertion or cast expression
KT-50258 equals() returns false on the same enum instances if we check it for the second time in when
KT-47483 JVM IR: “NoSuchElementException: Sequence contains no element matching the predicate” on compiling Array instantiation with TODO
KT-49765 JVM: ClassCastException when trying to add object to EmptyList
KT-46879 “AssertionError: Stack should be spilled before suspension call” with Flow and reified type
KT-50172 “AssertionError: Not a callable reflection type” on local function reference with the same name as local variable
KT-49443 JVM IR, Script: “IllegalStateException: No mapping for symbol: VALUE_PARAMETER INSTANCE_RECEIVER” with constructor call of class that has a top-level extension function call
KT-50193 Garbage collection is not working the same way after jvm-ir-backend change
KT-19424 Compilation exception for script with property delegate calling operator invoke on an object
KT-43995 Script: “IllegalStateException: No mapping for symbol: VALUE_PARAMETER INSTANCE_RECEIVER” if companion object initializer calls method on list
KT-30616 Script: “Don't know how to generate outer expression” for top-level variable reference from static context (companion object, enum)
KT-47000 Allow graceful migration to -Xjvm-default=all-compatibility by allowing to inherit from interfaces even in the old (-Xjvm-default=disable) mode
KT-50171 JVM IR: “UninitializedPropertyAccessException: Parent not initialized: IrVariableImpl” on SAM-converted property setter reference with Double parameter inside lambda
KT-50140 Internal error on explicit string concatenation of generic type value with ‘String’ upper bound
KT-49992 Anonymous object should not have access to private members from supertypes
KT-49973 Check existing of default error message for all diagnostics
KT-50019 Property delegated to callable reference: “ISE: Local class should have its name computed in InventNamesForLocalClasses” with -Xno-optimized-callable-references
KT-49645 JVM / IR: “IllegalStateException: Local class should have its name computed” caused by default suspend function in interface and value class
KT-50028 Incorrect implicit casts from Unit
KT-49615 JVM / IR: “Exception during IR lowering” with list of value classes with non-trivial constructor inside suspend lambda
KT-49127 FIR: smart cast is not performed after comparison
KT-48708 Incorrect cast from Unit to Int
KT-48376 FIR: False positive UNITIALIZED_VARIABLE after try/finally with return from try
KT-48113 FIR: (false) positive EQUALITY_NOT_APPLICABLE for intersection with platform type
KT-48305 FIR: incorrect raw type cast
KT-48378 FIR: synthetic accessor lowering should not attempt to modify other files
KT-48634 FIR: false property-setter-function resolve cycle
KT-48621 FIR: SyntheticAccessorLowering should not attempt to modify other files for protected JvmField
KT-48381 Invalid LLVM module: verification failure of createInlineClassInArgumentPosition.kt
KT-48527 Native: top-level properties in files with @Test functions are initialized eagerly even if lazy initialization is enabled
KT-48559 IllegalArgumentException: Unexpected super type argument: * @ 0 during IR lowering
KT-48687 IR dump mismatch after deep copy with symbols in IR text test
KT-44811 [FIR] Exception in body resolve of new contracts
KT-48363 FIR behaves differently in case of resolution between classifier and top-level property
KT-48801 “AssertionError: Stack should be spilled before suspension call” with Flow and crossinline
KT-46389 JVM / IR: “ClassCastException: class IrGetValueImpl cannot be cast to class IrConst” with inheritance of supertypes member functions with similar signatures
KT-47797 Regression during migration to 1.6 in compiler
KT-47987 Can't infer a postponed type variable based on callable reference receiver type
KT-48446 “IllegalStateException: IrErrorType (getErasedUpperBound)” caused by suspend function reference
KT-48651 Collect intermediate annotations during type expanding
KT-48754 JVM IR: in EnclosingMethod leads to IncompatibleClassChangeError on Android 5.0
KT-45034 Use the new type inference for top-level callable references
KT-49001 OptIn marker should spread from class to its members, taking into account real dispatch receiver type
KT-49038 Generics are discriminated during callable references resolution (false negative)
KT-48954 JVM IR: IllegalAccessError when using Java method reference in constructor
KT-48284 JVM / IR: “IllegalStateException: Function has no body: FUN STATIC_INLINE_CLASS_REPLACEMENT” caused by inline member toString of value class and string interpolation
KT-49053 JVM / IR: “AssertionError: Unbound symbols not allowed” on inheriting a protected Java method that returns a package private class from a differently-named file
KT-49106 JVM: infinite recursion with overridden default suspend interface method where override calls super
KT-45345 FIR DFA: FirDataFlowAnalyzer seems to add wrong type constraints for type parameters
KT-44513 FIR DFA: extract non-null info from x?.y!!
KT-44559 FIR DFA: propagate non-null info from not-null assertion (!!)
KT-49073 FIR: REDUNDANT_MODIFIER and DEPRECATED_MODIFIER_PAIR should be warnings
KT-46371 FIR: Investigate FunctionType -> ExtensionFunctionType coercion
KT-49078 FIR: false positive TYPE_VARIANCE_CONFLICT
KT-47135 FIR: local class references does not compile
KT-48600 NON_TAIL_RECURSIVE_CALL missing for calls inside lambda
KT-48602 NON_TAIL_RECURSIVE_CALL missing for calls with explicit dispatch receiver to a singleton
KT-48982 JVM / IR: KotlinNothingValueException caused by function with local object
KT-49087 FIR: false positive REPEATED_ANNOTATION
KT-48648 JVM IR: “AssertionError: Should be primitive or nullable primitive type” with @JvmField generic property with Number upper bound
KT-49069 FIR: False positive INAPPLICABLE_JVM_NAME on getter
KT-49203 JVM IR: “AssertionError: Unbound symbols not allowed” with lateinit var and plusAssign operator convention call
KT-48993 JVM / IR: “IllegalStateException: Validation failed in file <multi-file facade ...>” using @JvmMultifileClass and one of the symbols in the file exposes a @JvmInline value class
KT-48938 FIR: Investigate how priorities should work in case SAM-conversion + type parameters
KT-49129 FIR: false positive of INNER_CLASS_OF_GENERIC_THROWABLE_SUBCLASS
KT-49076 FIR: false positive “An annotation argument must be compile-time constant” on array of imports
KT-49222 FIR: StackOverflow in MethodSignatureMapper
KT-49083 FIR erroneously requires default value parameters for override calls when imported from object
KT-49135 FIR: ambiguity between type alias and function
KT-49134 FIR makes no difference between lambda with empty parameter list and without explicit parameter list
KT-49301 FIR: Unresolved reference: for object inherited from inner class
KT-49070 FIR: ABSTRACT_CLASS_MEMBER_NOT_IMPLEMENTED with type parameter / class conflict
KT-49133 FIR: protected java.lang.Throwable constructor is not available
KT-49407 JVM / IR: “java.lang.VerifyError: Bad local variable type” with “Int.mod” inside “Long.mod” and non-trivial argument
KT-44975 SUBCLASS_CANT_CALL_COMPANION_PROTECTED_NON_STATIC: confusing error message
KT-38698 MANY_INTERFACES_MEMBER_NOT_IMPLEMENTED error message: interface is called a “class”
KT-45001 Confusing warning message “This class can only be used with the compiler argument” for @OptIn annotation
KT-49411 JVM / IR: NullPointerException during IR lowering with @JvmField property in loop range
KT-49260 FIR: make FirBasedSymbol hierarchy to correspond FirDeclaration hierarchy
KT-49289 FIR: false positive “return required” for if/else with inlined return in branch
KT-49316 JVM / IR: “AssertionError: SyntheticAccessorLowering should not attempt to modify other files!” caused by unreachable code which try to modify val from the other package
KT-45915 NoDescriptorForDeclarationException: Descriptor wasn't found for declaration FUN with circular module dependencies in JPS
KT-49288 FIR2IR: consider generating all fake override calls properly
KT-42784 FIR2IR: first create fake overrides, then bind overridden to them
KT-48816 Kotlin/Native Symbol for public platform.darwin/NSObject|null[100] is unbound
KT-49372 JVM / IR: Incorrect work of the loop optimization for mutable variable
KT-49356 Native: UnsupportedOperationException: RETURNABLE_BLOCK caused by nested return with boxing and inline
KT-49659 JVM IR: Missing value class mangling in SAM wrappers for fun interfaces from different modules
KT-47101 Incorrect scope for supertypes in companion objects
KT-49360 Invalid LLVM module: “inlinable function call in a function with debug info must have a !dbg location”
KT-48430 JVM: ClassCastException with inline class as generic argument for type parameter used in a function type
KT-49575 IllegalArgumentException: Unhandled intrinsic in ExpressionCodegen with circular module dependencies in JPS
KT-47669 IR inliner doesn't handle inner class functions referring outer this
KT-48668 JVM IR: “ISE: Value at CLASS must not be null for CLASS” for modules with a dependency cycle
KT-49370 JVM / IR: “java.lang.VerifyError: Bad local variable type” with “fun Long.mod” and non-trivial argument
KT-46744 Memory Leaks in Kotlin daemon
KT-48806 False-negative USED_AS_EXPRESSION for unreachable catch clauses
KT-45972 FIR: type is incorrectly resolved to private
KT-46968 Remove FirCompositeScope from type resolve
KT-49072 FIR: accidental resolve to private-in-file type
KT-34822 FIR scopes: deal with nested / inner classes and type parameter priority
KT-49702 Exception from RENDER_WHEN_MISSING_CASES diagnostic on malformed sealed class inheritor
KT-49860 [FIR] Add smartcast expression to synthetic subj access
KT-49836 Inference fails on lambda and adjacent function expressions with receiver
KT-49832 Inference fails on lambda for function types with extension parameter
KT-49793 JVM: IncompatibleClassChangeError: Expected non-static field when property delegation uses receiver of another delegated property
KT-44022 Excessive diagnostics range for DECLARATION_CANT_BE_INLINED
KT-48690 VERSION_REQUIREMENT_DEPRECATION_ERROR message: use current compiler version instead of language version
KT-49609 Incorrect grammar in DATA_CLASS_NOT_PROPERTY_PARAMETER error message
KT-49600 Misspelled error message for non-constructor properties with backing fields in @JvmRecord class
KT-49339 Warn about synchronizing on value classes
KT-49950 Compilation failed: An operation is not implemented: IrBasedTypeParameterDescriptor
KT-23890 Default arguments are not transferred from expect generic member functions
KT-48811 Expect/actual class with default constructor argument values can not be instantiated from a shared source set without passing arguments (with HMPP enabled)
KT-48106 FIR: incorrect type inference in provideDelegate receiver
KT-48325 Safe call operator prevents object from being garbage collected before leaving function
KT-48104 FIR does not see NotNull/Nullable annotations on type arguments
KT-46812 [FIR] Make FIR diagnostics not related to Diagnostics from FE 1.0
KT-37374 [FIR] Add CheckInfixModifier resolution stage
KT-38351 FIR: Support CheckOperatorModifier resolution stage
KT-39614 [FIR] Fix building CFG for different candidates of plus assign call
KT-40197 [FIR] Strange Behaviour of Type Arguments
KT-40362 [FIR] Match type arguments with type parameters of corresponding qualifier
KT-40375 FIR: No transformation implicit type -> error type for function value parameters
KT-40585 [FIR] Incorrect type for 1/1.0
KT-42525 [FIR] Incorrect IR produced for java.lang.Byte.MAX_VALUE
KT-43359 FIR: Check applicability type for callable reference with unbound receiver
KT-43378 FIR: Support or prohibit via call checker callable references to member extensions
KT-43289 FIR: Correctly load irrelevant override for special built-ins
KT-44558 Annotation arguments const expr support is missing in FIR
KT-45223 [FIR] Ambiguity between explicit and synthetic removeAt
KT-42215 FIR: callable reference resolution with type constraints at call-sites
KT-45520 FIR: NONE_APPLICABLE for unsafe call to function with overloads instead of UNSAFE_CALL
KT-46410 [FIR] Transform of FirAugmentedArraySetCall leaves erroneous nodes in control flow graph
KT-46421 FIR: Investigate builder-inference cases
KT-43948 FIR: hidden unresolved callable reference
KT-46558 FIR DFA: run once contract is not considered when analyzing lambda
KT-47125 FIR: Do not avoid trivial constraints if they aren't from upper bounds
KT-43691 FIR: false positive VARIABLE_INITIALIZER_IS_REDUNDANT with usage in try...finally
KT-37311 [FIR] Support inference of callable references with type variable as expected type
KT-31972 Error type encountered: org.jetbrains.kotlin.types.ErrorUtils$UninferredParameterTypeConstructor@1f5b38c2 (ErrorType).
KT-48761 Report NO_TAIL_CALLS_FOUND on ‘tailrec’ modifier, not on the whole function header
KT-47647 NI: Function reference to Java static method can't compile if passed directly as KFunction1 parameter
KT-46995 Fix setters implicit types only resolved on full body resolve
KT-46359 Kotlin 1.5 lambda is not Java-serializable by default
KT-49282 FIR: suspend conversion does not work inside suspend lambda
KT-48953 FIR: implement diagnostic DELEGATE_USES_EXTENSION_PROPERTY_TYPE_PARAMETER
KT-38813 FIR: Report INSTANCE_ACCESS_BEFORE_SUPER_CALL diagnostic on receiver usages in secondary constructors headers
KT-49657 FIR: accidental override with get:JvmName
KT-49655 FIR: smart cast is not performed after update of var to not-null value in branch

IDE

KT-42194 OOME: Java heap space from incremental compilation

IDE. Gradle Integration

KT-47570 MPP, IDE: kotlin-test-common leaks into dependencies of platform-specific source sets

JavaScript

New Features

KT-43224 KJS: Allow using inline classes in external types
KT-35100 Make Char inline class in K/JS
KT-47525 KJS / IR: Support protected members in d.ts generation
KT-44494 KJS / IR: Allow enum classes to be exported
KT-50110 KJS / IR: Enable properties lazy initialization by default

Performance Improvements

KT-43644 KJS / IR: Avoid creating lambda classes

Fixes

KT-50934 KJS / IR: Re-export all JS-exports from the main module for the multi-module mode
KT-45620 KJS / IR: Remainder of division of Int.MIN_VALUE by -1 is negative zero (-0)
KT-46225 KJS IR: tailrec function with capturing lambda in default parameter value leads to UninitializedPropertyAccessException at compile time
KT-50512 KJS / IR: IC failed with const val in inline fun
KT-49738 Ensure that @AfterTest is invoked after the @Test function completes for asynchronous tests
KT-45542 KJS / IR: “IllegalStateException” for method with default argument in expect class
KT-50464 KJS IR: Functions with optional parameters and stable names are exported without @JsExport
KT-43374 KJS / IR: “class org.jetbrains.kotlin.js.backend.ast.JsIf cannot be cast to class org.jetbrains.kotlin.js.backend.ast.JsExpressionStatement” caused by if-else expression inside when
KT-20791 ushr Behavior differs in Javascript and Java targets
KT-37916 KJS: .d.ts generation not working for enum classes
KT-49844 KJS / IR: “IllegalStateException: IrSimpleFunctionSymbolImpl is already bound” with callable reference
KT-46961 KJS / IR: “IllegalStateException: Can't find name for declaration” when external object contains enum class
KT-43191 KJS / IR: static companion field is not static in d.ts
KT-39891 [KJS / IR] String interpolation and byte shift round Long value
KT-50040 JS IR: “Function must be an accessor of corresponding property” exception on private properties with getter in an exported class
KT-49878 Kotlin/JS, IR: incremental compilation fails with CCE: “class StageController cannot be cast to class WholeWorldStageController”
KT-46202 KJS / IR: “IllegalStateException” on exported value class
KT-42039 KJS / IR: JsQualifier annotation can cause conflicts with built-in functions
KT-39364 KJS: Can't export sealed class/object with subclasses inside the body to typescript definition
KT-47360 KJS / IR: js() function with string val
KT-47376 KJS / IR: Incorrect d.ts generation for sealed classes
KT-47767 KJS / IR: “IllegalStateException” with inline function with several lambda invocation declared through typealias
KT-47342 KJS / IR: “StackOverflowError” on InlinerTypeRemapper.remapTypeArguments
KT-46218 KJS / IR: Incorrect result for local tailrec function called from capturing inline lambda
KT-45056 KJS / IR: Inconsistent ordinal property value for enum classes
KT-47096 KJS / IR: Console.log introduces spaces between each character
KT-47516 KJS / IR: Wrong behavior when trying to access property in enum entry
KT-47806 KJS / IR: “IllegalStateException” with invocation of extension function with generic and lambda parameter on String.Companion
KT-49225 KJS: Default value for value class parameter is not considered
KT-49326 KJS / IR: Overridden properties should not be exported
KT-49363 KJS / IR: Nested declarations inside exported object are not exported
KT-49300 KJS: Source map generator leaks source files descriptors when source embedding is enabled
KT-50197 KJS IR: using APIs in different packages but with same method name generates clashes
KT-50203 JS IR BE: new IC for lowerings
KT-43250 KJS / IR: “Can't find name for declaration FUN” with Json#encodeToString as function reference
KT-46992 KJS / IR: Incorrect boxing of inline classes returned by crossinline suspend lambdas
KT-49776 KJS / IR: inliner doesn't handle inner class functions referring outer this
KT-49849 KJS / IR: Access of exported member properties should be by its stable name
KT-49850 KJS / IR: Member properties in exported class should be getter/setter in d.ts

Language Design

KT-48385 Deprecate confusing grammar in when-with-subject
KT-50251 Support language version 1.3 in Kotlin 1.6.20
KT-19423 Script: reference from class to script top-level member is incompilable
KT-17765 Ambiguity between SAM adapters when one SAM interface is sub type of another
KT-10926 False overload resolution ambiguity when both vararg and collection match
KT-41214 JDK 17: Emit PermittedSubclasses attribute when compiling sealed classes

Libraries

KT-44089 Java version checking doesn't work on Android
KT-50033 Some packages of kotlin-stdlib with public API are not exported in module-info
KT-48367 Using synchronized on captured object leads to slow JVM execution
KT-49721 KJS: Regex(“\b”).findAll yields infinite sequence when a zero length match is found before a surrogate pair (e.g. emoji)

Native

KT-49348 KONAN_NO_64BIT_ATOMIC does not guard Kotlin_AtomicLong_addAndGet
KT-42500 KLIB: K/N compiler cannot link with a library with incorrect symbol in the name or the path
KT-49395 K/N: After 1.5.20, compiling code including KSuspendFunction3 to framework leads to “Assertion failed at parametersAssociated”
KT-49967 Kotlin iOS regex issue
KT-49873 Native does not sort Strings correctly
KT-49347 androidNativeArm32 binaries crash when using atomic operations
KT-49144 Kotlin/Native executable early segmentation fault
KT-49463 --dry-run flag for llvm_builder/package.py
KT-49597 Kotlin/Native: Exporting the Arrow library into the framework causes StackOverflowError in the Devirtualization phase
KT-49790 “Undefined symbols” error when linking project with kotest 5.0.0.RC and Kotlin 1.6

Native. Build Infrastructure

KT-48625 Native: distribution doesn't contain sources for kotlin.test

Native. C Export

KT-47828 Kotlin/Native: Kotlin exception is not filtered out on interop border when producing a dynamic library with compiler caches enabled

Native. C and ObjC Import

KT-35059 Better “could not build module” cinterop report
KT-49768 Kotlin/Native: Add -Xoverride-konan-properties to cinterop.

Native. ObjC Export

KT-47399 Kotlin Native - Objective-C with Swift 5.5 Async Function Needs Returning KotlinUnit
KT-48282 Kotlin sealed class roots and abstract classes within sealed hierarchies have their constructors exposed to Objective-C/Swift
KT-46866 Memory consumption / performance of Kotlin classes with String property in KMP project on iOS Swift

Native. Platform Libraries

KT-50045 Kotlin/Native: Re-enable disabled Hypervisor framework
KT-47331 Kotlin/Native: support Xcode 13 SDKs

Native. Runtime

KT-50491 Kotlin/Native: Deadlock in the Ktor server tests with the new memory manager

Native. Runtime. Memory

KT-49497 iOS Swift “runtime assert: Must be positive” and “runtime assert: cycle collector shall only work with single object containers”
KT-50026 Kotlin/Native: Make AtomicReference behave like FreezableAtomicReference with the new MM
KT-49013 Kotlin/Native: Correctly switch thread state to native for spin locks

Native. Testing

KT-48561 Test sideEffectInTopLevelInitializerMultiModule fails with new MM

Reflection

KT-50198 Reflection: NPE from kotlin.jvm.internal.Intrinsics.areEqual with Spock

Tools. Android Extensions

KT-50627 NullPointerException when using kotlin-android-extensions synthetic after updating Kotlin to 1.6.10
KT-50887 kotlin-android-extensions plugin breaks when package attribute missing from AndroidManifest.xml

Tools. CLI

KT-46329 Deprecated -Xjvm-default values are not reported
KT-48027 “Module ... cannot be found in the module graph” with module-info in META-INF/versions
KT-48417 CLI: boolean -X arguments accept a value after ‘=’ which is ignored
KT-11164 Allow running class files with ‘.class’ extension in ‘kotlin’ script
KT-46171 NoClassDefFoundError produced when running kotlin script

Tools. Commonizer

KT-48856 MPP: Unable to resolve c-interop dependency for test compilation in an intermediate source set with the only platform
KT-46257 MPP: Stdlib included more than once for an enabled hierarchical commonization
KT-48288 [Commonizer] platform.posix.timespec.tv_sec not commonized in OKIO
KT-47574 [Commonizer] TypeAliasTypeCommonization: Properly substitute underlying type arguments
KT-48221 MPP: Too few targets specified if platform test source set depends on main
KT-47100 [Commonizer] Commonize underlying type-alias types

Tools. Compiler Plugins

KT-50718 Unable to serialize an object with a generic field
KT-50764 Kotlin 1.6.10 custom serializers for a generic type receive the unit serializer on jvm
KT-46444 JVM IR, serialization: “AssertionError: No such value argument slot in IrConstructorCallImpl: 0” with KSerializer of ClosedRange

Tools. Gradle

New Features

KT-41689 Support statistics for Configuration Cache
KT-49299 Add more flexible way for defining Kotlin compiler execution strategy
KT-21056 Kotlin Gradle Plugin tasks execution should be parallelized by default

Performance Improvements

KT-50664 Compile speed regression going from Kotlin 1.5.31 to 1.6.10 for incremental changes when Java class in a dependent child module w/ kapt is modified w/o a method/class signature change
KT-48884 Configuration performance regression in Kotlin Gradle plugin 1.5.30
KT-49782 Improve compilation task outputs snapshot performance

Fixes

KT-48134 Debug log level causes build cache miss
KT-49014 Disable Explicit API is not possible
KT-48408 Build may fail with strict JVM target validation mode when project has no Kotlin sources
KT-50620 Gradle Kotlin Plugin crashes in CI due to hostname resolving issue
KT-49921 Setup basic release performance regression tests
KT-50369 Deprecate kotlin.experimental.coroutines Gradle DSL option and kotlin.coroutines property
KT-48046 Gradle Throws Exception From Kotlin Plugin: destinationDir must not be null
KT-50037 Kotlin compile task registers more than one task action and their order of execution is counter-intuitive
KT-49772 Kotlin in-process compilation does not release file handles
KT-47215 KJS: “UninitializedPropertyAccessException: lateinit property fileHasher has not been initialized” when running kotlinNpmInstall or rootPackageJson locally
KT-46406 Remove ‘kotlin.parallel.tasks.in.project’ build property

Tools. Gradle. JS

KT-49253 KJS / Gradle: Error while evaluating property ‘filteredArgumentsMap’ of task ‘:compileProductionExecutableKotlinJs’
KT-49037 KJS / Gradle: Configuration cache usage on large projects lead to high memory consumption by Gradle daemon
KT-49902 Kotlin/JS: Gradle: with --debug it still runs yarn without --ignore-scripts
KT-49808 KJS / Gradle: NPE when running node.js Mocha tests with configuration cache reuse
KT-49530 KJS: Update Node.JS and Yarn
KT-49445 KJS / IR: “AssertionError: Built-in class kotlin.Unit is not found” 1.5.31 fails on consuming artifacts built with 1.6.0

Tools. Gradle. Multiplatform

KT-49089 An annotation class annotated with @OptionalExpectation can not be used in another module with HMPP enabled
KT-48818 False positive warning about used enableDependencyPropagation flag with enabled hierarchical mpp by default
KT-49596 Composite Metadata Jar: Read location of cinterops from KotlinProjectStructureMetadata file
KT-41823 Default arguments not work in iosMain metadata with enableGranularSourceSetsMetadata
KT-50574 Only enable cinterop metadata transformation when ‘kotlin.mpp.enableCInteropCommonization’ is set

Tools. Gradle. Native

New Features

KT-47633 Accept version when configuring cocoapods for kotlin/native
KT-42630 CocoaPods Gradle plugin: Allow customization of podspec properties
KT-48553 Kotlin/Native: use Gradle Shared Build Service to read konan.properties
KT-47529 Read list of opt-in cacheable native targets from konan.properties

Fixes

KT-49484 Kotlin/Native: XCFramework should include dSYM files for release artifacts
KT-47768 Gradle MPP plugin: K/N targets break task configuration avoidance for assemble task
KT-49971 Make ‘embedAndSignAppleFrameworkForXcode’ task visible for users
KT-43815 [CocoaPods Plugin] Pod name cannot be changed
KT-42105 Multiplatform Cocoapod kotlin plugin doesn't support repo distribution
KT-48808 XCFramework task fails when using static debug frameworks
KT-42755 Cocoapods plugin using backslashes on Windows

Tools. JPS

KT-49177 JPS: Kotlin compiler doesn't recompile file that references Java constant in class body
KT-46506 JPS: Kotlin compiler doesn't recompile file that references Java constant
KT-47909 UtilsKt.recordPackageLookup is slow
KT-47857 Class loaders clash when building kotlin project with FIR with JPS without daemon

Tools. Kapt

KT-32596 kapt replaces class generated by annotation processor with error.NonExistentClass when the class is used as an annotation
KT-48617 Cache miss due to empty directories in KaptGenerateStubsTask inputs
KT-48826 Deprecate ‘kapt.use.worker.api’ property
KT-47002 Kapt: warning mentions non-effective property kapt.includeCompileClasspath

Tools. Maven

KT-50306 Configured plugin dependencies should be available in kotlin-maven-plugin scripts

Tools. Parcelize

KT-19853 Parcelize: CREATOR field should be available from code

Tools. REPL

KT-20488 REPL: java.lang.InternalError: “Enclosing constructor not found” for class reference on an anonymous object literal

Tools. Scripts

KT-40497 “Cannot inline bytecode built with JVM target 1.8 into bytecode that is being built with JVM target 1.6.” for running script without specified jvm-target
KT-49329 Kotlin scripts are compiled with jvmTarget 1.8 by default and in many scenarios there is no way to redefine it, which lead to inlining errors e.g. with JDK 17

1.6.10

Android

KT-49798 [MPP] [Android] AGP 7.1.0+ android target publications leak ‘AgpVersionAttr’ attribute

Compiler

Performance Improvements

KT-49821 Optimize LazyClassMemberScope#getContributedDescriptors: use nameFilter

Fixes

KT-49833 java.lang.NullPointerException caused by accidental newline in package directive
KT-49838 Type inference fails on 1.6.0: Cannot use ‘CapturedType(*)’ as reified type parameter
KT-49752 Regression in method return type inference: “IllegalStateException: Expected some types”
KT-49876 Kotlin/Native: cross-compilation of Linux static library is broken in Windows in 1.6.0
KT-49792 Atomicfu: “standalone invocation of kotlinx.atomicfu.AtomicInt::compareAndSet that was not traced to previous field load” with suspend function
KT-49834 Coroutine method transformer generates invalid locals table.
KT-49441 Support friend modules in Kotlin Native
KT-49248 K/N: Symbol with IrSimpleFunctionSymbolImpl is unbound after 1.5.30
KT-49651 Inconsistent compiler APIs for repeatable annotations
KT-49168 JVM IR: IndexOutOfBoundsException with fun interface + suspend function as SAM method
KT-49573 No annotated types, compiler emits “Annotated types are not supported in typeOf”
KT-47192 Build Fake Overrides for internal members of classes from friend module
KT-48673 IR: IllegalStateException for usage of internal member declared in a superclass in another module

JavaScript

KT-47811 KJS / IR: “ClassCastException” when using suspend function in console.log

Language Design

KT-49868 Support language version 1.3 in Kotlin 1.6.10

Libraries

KT-50173 Different behavior of Regex escapeReplacement function in JVM and JS

Tools. Android Extensions

KT-49799 NullPointerException when using kotlin-android-extensions synthetic after update to Kotlin 1.6.0

Tools. Compiler Plugins

KT-50005 jvm-abi-gen plugin: do not change the declaration order in generated jars
KT-49726 JVM/IR: “IllegalArgumentException: Null argument in ExpressionCodegen for parameter VALUE_PARAMETER”: Serialization with sealed class as type parameter

Tools. Gradle

KT-49835 Android consumers can't resolve Android debug variants of published MPP libraries published with Kotlin 1.6.0 & Gradle 7.0+
KT-49910 Incremental compilation speed regression in 1.6.0 for Android projects

Tools. Gradle. JS

KT-49109 KJS / Gradle: Configuration failed: Could not find node-14.17.0-darwin-arm64.tar.gz (org.nodejs:node:14.17.0)
KT-50135 KJS: Problem with Yarn install with scripts on Windows
KT-34014 Gradle, JS: Ability to persist / reuse yarn.lock
KT-49505 KJS / IR: Installation of NPM dependencies should be with ignore-scripts

Tools. Gradle. Native

KT-49931 Kotlin Multiplatform Fails in Windows after 1.6.0 upgrade - Cannot run program “pod”
KT-49771 podInstall task is not executed after adding a pod dependency to the shared module

Tools. Incremental Compile

KT-49822 Incremental compilation state is modified when the build fails in Kotlin 1.6
KT-49340 “IllegalStateException: @NotNull method org/jetbrains/kotlin/com/intellij/openapi/application/AsyncExecutionService.getService must not return null” with Anvil plugin and incremental compilation

1.6.0

Android

KT-48019 Bundle Kotlin Tooling Metadata into apk artifacts
KT-47733 JVM / IR: Android Synthetic don't generate _findCachedViewById function

Compiler

New Features

KT-47984 In-place arguments inlining for @InlineOnly functions
KT-12794 Allow runtime retention repeatable annotations when compiling under Java 8
KT-43714 Support annotations on class type parameters (AnnotationTarget.TYPE_PARAMETER)
KT-45949 Kotlin/Native: Improve bound check elimination
KT-43919 Support loading Java annotations on base classes and implementing interfaces' type arguments
KT-48194 Try to resolve calls where we don't have enough type information, using the builder inference despite the presence of the annotation
KT-47736 Support conversion from regular functional types to suspending ones in JVM IR
KT-39055 Support property delegate created via synthetic method instead of field

Performance Improvements

KT-45185 FIR2IR: get rid of IrBuiltIns usages
KT-47918 JVM / IR: Performance degradation with const-bound for-cycles
KT-33835 Bytecode including unnecessary null checks for safe calls where left-hand side is non-nullable
KT-41510 Compilation of kotlin html DSL is still too slow
KT-48211 We spend a lot of time in ExpectActual declaration checker when there is very small amount of actual/expect declaration
KT-39054 Optimize delegated properties which call get/set on the given KProperty instance on JVM
KT-46615 Don't generate nullability assertions in methods for directly invoked lambdas

Fixes

KT-49613 JVM / IR: “Exception during IR lowering” with java fun interface and it's non-trivial usage
KT-49548 “ClassCastException: java.util.ArrayList$Itr cannot be cast to kotlin.collections.IntIterator” with Iterable inside let
KT-22562 Deprecate calls to “suspend” named functions with single dangling lambda argument
KT-47120 JVM IR: NoClassDefFoundError when there are an extension and a regular function with the same name
KT-49477 Has ran into recursion problem with two interdependant delegates
KT-49442 ClassCastException on reporting [EXPOSED_FROM_PRIVATE_IN_FILE] Deprecation: private-in-file class should not expose ‘private-in-class’
KT-49371 JVM / IR: “NoSuchMethodError” with multiple inheritance
KT-44843 PSI2IR: “org.jetbrains.kotlin.psi2ir.generators.ErrorExpressionException: null: KtCallExpression” with delegate who has name or parameter with the same name as a property
KT-49294 Turning FlowCollector into ‘fun interface’ leads to AbstractMethodError
KT-18282 Companion object referencing it's own method during construction compiles successfully but fails at runtime with VerifyError
KT-25289 Prohibit access to class members in the super constructor call of its companion and nested object
KT-32753 Prohibit @JvmField on property in primary constructor that overrides interface property
KT-43433 Suspend conversion is disabled message in cases where it is not supported and quickfix to update language version is suggested
KT-49399 Building repeatable annotation with Container nested class fails with ISE: “Repeatable annotation class should have a container generated”
KT-49209 Default upper bound for type variables should be non-null
KT-49335 NPE in RepeatedAnnotationLowering.wrapAnnotationEntriesInContainer when using @Repeatable annotation from different file
KT-48876 java.lang.UnsupportedOperationException: org.jetbrains.kotlin.ir.expressions.impl.IrReturnableBlockImpl@4a729df2
KT-48131 IAE “Repeatable annotation container value must be a class reference” on using Kotlin-repeatable annotation from dependency
KT-49322 Postpone promoting warnings to errors for ProperTypeInferenceConstraintsProcessing feature
KT-49285 Exception on nested builder inference calls
KT-49101 IllegalArgumentException: ClassicTypeSystemContext couldn't handle: Captured(out Number)
KT-41378 Compilation failed: Deserializer for declaration public kotlinx.coroutines/SingleThreadDispatcher|null[0] is not found
KT-47285 IR deserialization exception when dependency KLIB has class instead of typealias
KT-46697 IllegalStateException: IrTypeAliasSymbol expected: Unbound public symbol for public kotlinx.coroutines/CancellationException|null[0] compiling KMM module for Kotlin/Native with Kotlin 1.5
KT-36399 Gradually support TYPE_USE nullability annotations read from class-files
KT-11454 Load annotations on TYPE_USE/TYPE_PARAMETER positions from Java class-files
KT-18768 @Notnull annotation from Java does not work with varargs
KT-24392 Nullability of Java arrays is read incorrectly if @Nullable annotation has both targets TYPE_USE and VALUE_PARAMETER
KT-48157 FIR: incorrect resolve with built-in names in use
KT-46409 FIR: erroneous resolve to qualifier instead of extension
KT-44566 FirConflictsChecker do not check for conflicting overloads across multiple files
KT-37318 FIR: Discuss treating flexible bounded constraints in inference
KT-45989 FIR: wrong callable reference type inferred
KT-46058 [FIR] Remove state from some checkers
KT-45973 FIR: wrong projection type inferred
KT-43083 [FIR] False positive ‘HIDDEN’ on internal
KT-48794 Breaking change in 1.5.30: Builder inference lambda contains inapplicable calls so {1} cant be inferred
KT-46727 Report warning on contravariant usages of star projected argument from Java
KT-40668 FIR: Ambiguity on qualifier when having multiple different same-named objects in near scopes
KT-37081 [FIR] errors NO_ELSE_IN_WHEN and INCOMPATIBLE_TYPES absence
KT-48162 NON_VARARG_SPREAD isn't reported on *toTypedArray() call
KT-45118 ClassCastException caused by parent and child class in if-else
KT-47605 Kotlin/Native: switch to LLD linker for MinGW targets
KT-48912 K/N Symbol with IrSimpleFunctionSymbolImpl is unbound and JS Validation failed in file shaders.kt
KT-44436 Support default not null annotations to enhance T into T!!
KT-49190 Increase stub versions
KT-48261 “overload resolution ambiguity” for JSpecify+jsr305-annotated Java List implementation
KT-48778 -Xtype-enhancement-improvements-strict-mode not respecting @NonNull annotation for property accesses?
KT-48606 [1.6] Instantiated annotations do not implement hashCode correctly/consistently
KT-49157 Tail-call optimization miss with cast to type parameter
KT-46437 NI: “Throwable: Resolution error of this type shouldn't occur for resolve if as a call” caused by reflectively accessing private property inside “if/else” or “when” expression
KT-48590 IllegalArgumentException: ClassicTypeSystemContext couldn't handle: Captured(*) reified type class reference
KT-48633 Can‘t infer builder inference’s type argument across local class
KT-49136 JVM IR: NPE with safe call chain and property set to null by reflection
KT-48570 OptIn marker should not spread from class to its members
KT-48928 Prohibit using old JVM backend with language version >= 1.6
KT-41978 NI: Kotlin fails to infer type of function argument
KT-48101 Smart cast on base class property is impossible if base class is from another module
KT-48732 JVM / IR: MalformedParameterizedTypeException is thrown when a Spring Bean of suspending function type is registered
KT-47841 Turning LV to 1.6 breaks some diagnostics based on jspecify annotations
KT-48498 JVM IR: IllegalAccessError with inline function call and property delegation from different module
KT-48319 JVM / IR: AssertionError: FUN caused by suspend lambda inside anonymous function
KT-48835 Psi2ir: vararg parameter value is lost when translating adapted function reference to base class member
KT-46908 JVM / IR: do not wrap fun interface implementation into another SAM adapter if it inherits from a functional type
KT-48927 JVM IR: “VerifyError: Bad invokespecial instruction: current class isn't assignable to reference class” when up-casting and read a base class‘s private property that has a custom getter in the base class’s public function
KT-48992 Postpone migration to new operator resolution scheme for integer literals
KT-48290 Type bounds warning based on Java annotations not issues with language level 1.6
KT-47920 There is no warning on violated nullability of type parameter in accordance with java nullability annotation
KT-41664 Remove the “runtime JAR files in the classpath should have the same version” warning
KT-48851 Keep using warn mode for jspecify in 1.6
KT-46829 IR: NullPointerException caused by setting scoped generic extension var
KT-42972 Forbid protected constructor calls from public inline functions
KT-45378 Prohibit super calls in public-api inline functions
KT-48515 JSpecify: If a class has a @Nullable type-parameter bound, Kotlin should still treat unbounded wildcards like platform types
KT-48825 JVM IR: NPE with delegated property “by this” to base class
KT-48535 Make EXPERIMENTAL_ANNOTATION_ON_OVERRIDE warning
KT-47928 Prohibit declarations of repeatable annotation classes whose container annotation violates JLS
KT-47971 Report error on declaration of a repeatable annotation class with nested class named Container
KT-48478 JVM IR: Coroutines 1.5.1 + Kotlin 1.5.30 - ClassCastException: CompletedContinuation cannot be cast to DispatchedContinuation
KT-48523 Kotlin/Native: cross-compilation from Linux to MinGW not working when platform.posix is used
KT-48671 JVM / IR: “AssertionError: Primitive array expected: CLASS IR_EXTERNAL_DECLARATION_STUB CLASS”
KT-46181 JVM IR: private @JvmStatic function is generated in the outer class instead of companion object, which breaks existing calls via JNI or reflection (e.g. JUnit @MethodSource)
KT-48736 JVM IR: assert in SyntheticAccessorLowering when inline function attempts to access package-private field from Java
KT-48653 Warnings on non-exhaustive when statements missing in some cases with 1.6
KT-48394 JVM: Invalid locals caused by unboxing bytecode optimization
KT-20542 IllegalAccessError on calling private function with default parameters from internal inline function used in another package
KT-48331 JVM / IR: “VerifyError: Bad access to protected data in invokevirtual” when a sealed class uses another sealed class in its same hierarchy level as a constructor parameter
KT-48380 kotlin.RuntimeException: Unexpected receiver type
KT-47855 Kotlin/Native: compilation fails due to Escape Analysis
KT-48291 False positive [ACTUAL_MISSING] Declaration must be marked with ‘actual’ when implementing actual interface
KT-48445 “IAE: Top level call context should not be null to analyze coroutine-lambda” when compiling Kotlin with language version 1.6
KT-48618 Enable by default “suspend conversion” feature in 1.6
KT-47638 Drop EXPERIMENTAL_IS_NOT_ENABLED diagnostic
KT-48589 KotlinTypeRefiner is lost, leading to TYPE_MISMATCH and OVERLOAD_RESOLUTION_AMBIGUITY issues with MPP projects
KT-48615 Inconsistent behavior with integer literals overflow (Implementation)
KT-47937 Implement deprecation of computing constant values of complex boolean expressions in when condition branches and conditions of loops
KT-48391 JVM / IR: “AssertionError: SyntheticAccessorLowering should not attempt to modify other files!” caused by class which inherits interface which has default function with default argument from companion const val
KT-48552 Kotlin/Native: iosArm64 debug build fails in 1.6.0-M1-139
KT-46182 Native: prohibit using dots in identifiers
KT-46230 JVM IR: “IllegalArgumentException: Null argument in ExpressionCodegen for parameter VALUE_PARAMETER MOVED_DISPATCH_RECEIVER” with value class overriding function with default parameter
KT-48302 FIR: Investigate not-null assertion on generic Java method
KT-48350 JVM IR: NPE from LocalDeclarationsLowering on property reference with field from outer class used as receiver (1.6.0-M1 regression)
KT-48500 AE: “Last parameter type of suspend function must be Continuation, but it is kotlin.coroutines.experimental.Continuation” for kotlin-stdlib-common library
KT-48469 Problem with properties lazy initialization while using kotlinx.serialization plugin
KT-48432 Regression in IntRange.contains (and probably other ranges too) when used in-place
KT-44855 “AssertionError: SyntheticAccessorLowering should not attempt to modify other files” on smart cast of protected field owner
KT-47542 Incorrect ABSTRACT_CLASS_MEMBER_NOT_IMPLEMENTED after migration to 1.6 on class indirectly extending RuntimeException
KT-48166 FIR: incorrect common supertype for PSI elements hierarchy
KT-47499 JVM / IR: java.lang.VerifyError: Bad access to protected data in invokevirtual when trying to clone the result of lambda invocation that is “this” in an extension function
KT-46451 JVM Debugging: stepping on finally block end brace line before stepping into finally code
KT-48329 It's impossible to infer a type variables based on several builder inference lambdas
KT-48193 Don't use the builder inference for calls which can be resolved without it
KT-46450 JVM Debugging: some break statements in catch blocks have no line numbers and you cannot set breakpoints on them
KT-48298 FIR: incorrect deserialized annotations in back-end
KT-48234 FIR: false positive NON_INTERNAL_PUBLISHED_API for primary constructor property
KT-48174 IR interpreter: unsupported compile-time call
KT-48158 FIR: false positive ASSIGNMENT_TYPE_MISMATCH as a result of wrong type inference around callable references
KT-48109 FIR: incorrect type inference for generic argument of intersection type
KT-48161 FIR: false positive ARGUMENT_TYPE_MISMATCH for bounded type parameter VS Java not-null
KT-48159 FIR: erroneous scope order during type resolve of constructor return type
KT-48165 FIR: false positive “initializer should be a constant value” on String.length
KT-48175 FIR: exception for JvmField on local class property
KT-48164 FIR: false positive OVERRIDING_FINAL_MEMBER in enum entry
KT-48116 FIR: false positive NOT_A_LOOP_LABEL
KT-48102 FIR: false positive ABSTRACT_MEMBER_NOT_IMPLEMENTED with mapped stdlib functions
KT-47911 Native compiler on ios_arm64 target generates movi.2d instructions, which are mishandled by Apple hardware
KT-48105 FIR: generic/specific callable reference ambiguity
KT-14392 Repeated annotation with use site target is not detected for getter and setter
KT-47493 Missed frontend diagnostic in try/catch
KT-48058 “No type for expression” compiler exception on calls with unused lambda
KT-47597 JVM IR: if statement doesn't eval correctly on 1.5.20 possible nullable type differences.
KT-47922 False negative type mismatch on empty when as last statement of lambda
KT-34594 Do not generate fake debugger variables initialization for @InlineOnly functions
KT-47749 Incorrect scope of a local variable inside the coroutine
KT-47527 JVM / IR ClassCastException: “kotlin.Unit cannot be cast to java.lang.String”
KT-47840 JVM / IR: “IllegalStateException: No mapping for symbol: VALUE_PARAMETER name: x” in nested local functions with recursive calls
KT-46448 JVM Debugging: Locals in finally blocks not always duplicated when the finally block is
KT-47716 JVM / IR: NoSuchMethodError when trying to get MAX_VALUE from ULong in non-trivial try/finally context
KT-47762 JVM / IR: Properties with the same signatures in inline class and its companion object crashes the compiler with NullPointerException
KT-47741 JVM / IR: VerifyError: Bad type on operand stack with iterator and invoking method reference to IntIterator
KT-43696 ClassFormatError on @JvmStatic external fun in interface companion object
KT-47715 JVM / IR, R8: External getter cannot be represented in dex format
KT-47684 Add warning on is checks which are always false
KT-47685 False positive CAST_NEVER_SUCCEEDS on variable of intersection type
KT-32188 NI: False positive “This cast can never succeed”
KT-35687 NI: Poor cast can never succeed [CAST_NEVER_SUCCEEDS]
KT-41331 False negative USELESS_IS_CHECK with null
KT-47609 JVM IR: “AssertionError: Unexpected number of type arguments” when compiling an extension property with annotation and it extends a value class with a generic parameter
KT-47413 FIR: Rework FirDelegatedScope
KT-47492 Illegal use of DUP

Docs & Examples

KT-48534 Wrong compiler argument for RequiresOptIn

IDE

KT-48604 MISSING_DEPENDENCY_CLASS in test source sets with kotlin.mpp.enableGranularSourceSetsMetadata=true

IDE. Debugger

KT-47970 AE: “Either library or explicit name have to be provided ” in IR debugger tests

IDE. Gradle Integration

KT-46273 MPP: Don't fail import for case of missed platform in source set structure
KT-48823 Improve error reporting on import when configuration phase in Gradle failed
KT-48504 MPP: UninitializedPropertyAccessException on import if new hierarchical mpp flag conflicts with other flags
KT-47463 MPP: Import fails with Task 'runCommonizer' not found in root project if Kotlin configured only in module

IDE. Multiplatform

KT-47604 kotlin-stdlib-common leaks into dependencies of Android-specific source sets

JavaScript

KT-43783 KJS / IR: companion object and nested objects are not exported
KT-47524 KJS / IR: Treat protected members as part of exported API
KT-48132 KJS / IR: “IllegalStateException” when interface methods don't have default implementation
KT-47700 Support instantiation of annotation classes on JS
KT-48317 KJS / IR: “TypeError: ... is not a function” on running code with suspend function inheritors
KT-48344 KJS / IR: incorrect call with vararg argument from suspend function
KT-47751 Kotlin/JS: IR + IC: “argument has no effect without source map” warnings on build

Libraries

New Features

KT-46423 infix extension fun Comparable.compareTo
KT-47421 Stabilize collection builders
KT-48584 Introduce JVM readln() and readlnOrNull() top-level functions

Performance Improvements

KT-45438 Remove brittle ‘contains’ optimization in minus/removeAll/retainAll

Fixes

KT-28378 Different behavior of Regex replace function in JVM and JS when replacement string contains group reference
KT-46785 Get rid of !! after readLine() in the standard library
KT-46784 Stabilize Duration API in the standard library
KT-46229 Bring back Duration factory extension properties
KT-27738 Make JS Regex.replace not inline
KT-48607 Stabilize experimental API for 1.6
KT-47304 Random#nextLong generates value outside provided range
KT-47706 System property that controls the brittle contains optimization
KT-48999 Align behavior of some JS functions with their JVM counterpart
KT-46243 Typography.leftGuillemete and Typography.rightGuillemete are named inconsistent with standard
KT-46101 Review deprecations in stdlib for 1.6
KT-48456 Introduce Common (multi-platform) readln() and readlnOrNull() top-level functions
KT-48587 Deprecate some of JS-only stdlib API
KT-39328 Make builder collection implementations serializable
KT-47676 K/JS: MatchResult.next() returns no expected next match if called after matchEntire
KT-39166 Nothing is silently mapped to Void in arguments of the type passed to typeOf
KT-39330 Migrate declarations from kotlin.dom and kotlin.browser packages to kotlinx.*
KT-28753 Comparing floating point values in array/list operations ‘contains’, ‘indexOf’, ‘lastIndexOf’: IEEE 754 or total order
KT-38854 Gradually change the return type of collection min/max functions to non-nullable
KT-38754 Deprecate appendln in favor of appendLine

Native

KT-48807 Cinterop: cannot create bindings for a framework when Xcode 13 RC is installed
KT-49384 Kotlin/Native: Unexpected variance in super type argument: out @0
KT-47424 StackOverflowError in IR hashCode() methods compiling KMM module for Kotlin/Native with Kotlin 1.5.0+
KT-49234 SIGSEGV using the new memory manager in release in Kotlin 1.6.0-RC in MacosX64
KT-48566 ExceptionInInitializerError when configuring Gradle project with kotlin-multiplatform plugin on a host unsupported by Kotlin/Native
KT-48039 Native: support shaded (aka embeddable) compiler jar in Gradle plugin
KT-42693 Remove dependency on ncurses5 library

Native. C Export

KT-47209 kotlin-native fails to generate valid C header if a setter takes anonymous parameter (_)

Native. C and ObjC Import

KT-48074 Native: cinterop: __flexarr support

Native. ObjC Export

KT-47809 Kotlin/Native: ObjC-export module name usage in klib compilation

Native. Platforms

KT-43024 Kotlin/Native: Windows as cross-compilation target

Native. Runtime

KT-48452 Kotlin/Native: Support thread state switching in termination handlers for the new MM

Native. Runtime. Memory

KT-48143 Kotlin/Native: test fails with assert with new MM and state checker
KT-48364 Uninitialized top-level properties in new MM
KT-44283 staticCFunction with CValue parameter crashes when invoked off the main thread

Native. Stdlib

KT-47662 [Native, All platforms] Incorrect parsing of long strings to Float and Double

Reflection

KT-45066 Support flexible types (nullability, mutability, raw) in typeOf
KT-35877 typeOf<MutableList<>> cannot be distinguished from typeOf<List<>> in Kotlin/JVM

Tools. CLI

KT-49007 Support three previous API versions
KT-48622 Introduce compiler X-flag to use the builder inference for all calls by default
KT-32376 “no main manifest attribute” on running the jar for cli-compiled Kotlin objects with main function
KT-48026 Add the compiler X-flag to enable self upper bound type inference
KT-47640 CLI: support -option=value format as for -Xoption=value
KT-47099 Add a stable compiler argument for opt-in requirements as soon as they are stable

Tools. Commonizer

New Features

KT-48455 [Commonizer] Optimistic number commonization
KT-48459 [Commonizer] Add opt-in annotation to optimistically commonized numbers

Fixes

KT-47430 [Commonizer] ‘platform.posix.DIR’ not implementing ‘CPointed’ when commonized for “unixMain”
KT-48567 [Commonizer] pthread_self function is not commonized in atomicfu
KT-48287 [Commonizer] platform.posix.mkdir not commonized in OKIO
KT-48286 [Commonizer] platform.posix.ftruncate not commonized in OKIO
KT-47523 MPP: Unable to resolve c-interop dependency if platform is included in an intermediate source set with the only target
KT-48278 [Commonizer] platform.posix.usleep not commonized in sqliter
KT-46691 MPP: Type mismatch for hierarchically commonized typealiases
KT-47221 C-interop commonization fails if few targets reuse same source set
KT-47775 Commonizer don't run for shared native code if test source set depends on main
KT-47053 MPP: Unable to resolve c-interop commonized code from shared test source set
KT-48118 Commonized c-interop lib is not attached to common main source set
KT-47641 Enabled cInterop commonization triggers native compilation during Gradle sync in IDE
KT-47056 MPP: Change naming for folder with commonized c-interop libraries

Tools. Compiler Plugins

KT-48842 Compiler crash: Symbol with IrFieldSymbolImpl is unbound
KT-48117 Kotlin AllOpen Plugin should open private methods
KT-40340 jvm-abi-gen plugin: failure with Android D8 (Dexer) tool
KT-40133 jvm-abi-gen plugin: fails for inline function containing apply block with anonymous object
KT-28704 jvm-abi-gen plugin: avoid calling codegen twice per module
KT-48111 JVM / IR: “IllegalAccessError: tried to access method” with NoArg plugin and sealed class

Tools. Gradle

Performance Improvements

KT-49159 KotlinGradleBuildServices leaks Gradle instance when configuration cache is enabled

Fixes

KT-45504 Deprecate Gradle option KotlinJvmOptions.useIR since 1.5
KT-49189 In Gradle, dependencies on an MPP with Android+JVM fail to resolve in pure-Java projects
KT-48830 Change deprecation level to ‘ERROR’ for ‘KotlinGradleSubplugin’
KT-48264 Cannot write Kotlin build report unless directory exists
KT-48745 JVM target compatibility check should be disabled when Java sources are empty
KT-49066 Setting kotlinOptions.modulePath in an android project breaks incremental compilation
KT-48847 Remove deprecated kotlin options marked for removal after 1.5
KT-48245 KGP makes compileOnly configuration resolvable
KT-38010 Invalid warning “Runtime JAR files in the classpath should have the same version.” with java-gradle-plugin
KT-48768 Misleading ‘jdkHome’ deprecation message
KT-46719 Remove ‘kotlin.useFallbackCompilerSearch’ build option
KT-47792 KGP should ignore ProjectDependency when customize kotlin Dependencies
KT-47867 Replace usages of IncrementalTaskInputs with InputChanges
KT-46972 Migrate Kotlin repo to use Gradle toolchain feature

Tools. Gradle. JS

KT-49124 KJS / Gradle: Unable to load ‘@webpack-cli/serve’ command
KT-49201 KJS / Gradle: NPM dependencies resolution may fail on parallel builds
KT-48241 KJS / Gradle: NPM test dependency may break Gradle configuration cache
KT-32071 Possibility to disable downloading of Node.js and Yarn
KT-48332 Make NodeJsSetupTask and YarnSetupTask not cacheable
KT-37895 KJS: NPM Post-install Scripts sometimes print “node: not found”
KT-34985 kotlin-gradle-plugin: Should align ways NodeJs and Yarn are downloaded

Tools. Gradle. Multiplatform

KT-48709 MPP: Task compileKotlinMacosX64 fails on matching native variants if ktlint presented
KT-48919 Gradle multiplatform plugin 1.6.0-M1 does not accept apiVersion = “1.7”
KT-46343 [Commonizer] Use lockfile for NativeDistributionCommonizationCache
KT-48427 Execution failed for task ‘:commonizeNativeDistribution’. > java.io.FileNotFoundException lock (No such file or directory)
KT-48513 Commonized platform libraries are unresolved in modules for new hierarchical MPP flag
KT-48138 CInteropCommonizer: Missing commonization request if test source set has different targets than associated main
KT-35832 Gradle: MPP plugin operates with -Xuse-experimental and not with -Xopt-in

Tools. Gradle. Native

KT-48729 Test-source sets receive extra unnecessary granular dependencies to more common source sets when depending on MPP-library
KT-37511 CocoaPods Gradle plugin: Support incremental task execution when switching between Xcode and terminal
KT-47362 Cocoapods plugin: add error reporting for case when pod is not installed on user machine
KT-37513 CocoaPods Gradle plugin: Support building tests from terminal for projects depending on pods

Tools. Kapt

KT-45545 Kapt is not compatible with JDK 16+
KT-47853 KaptWithoutKotlincTask eagerly resolves dependencies during construction/configuration and can cause deadlocks
KT-47934 KaptJavaLog is unable to map stub back to the kotlin source
KT-48195 Kapt causes dead lock in DefaultFileLockManager

Tools. Scripts

KT-49400 Script resolver options can't take values with special symbols (/, , $, :, .) in them
KT-49012 Compiling .kts script with inner class declaration fails with Backend Internal Error caused by AE: “Local class constructor can't have dispatch receiver”
KT-47927 Script: memory leak with new engines
KT-48025 JVM / IR / Script: IllegalStateException: No mapping for symbol: VALUE_PARAMETER INSTANCE_RECEIVER caused by method tnat returns outer function
KT-48303 main.kts script fails to detect vanished dependencies if run from the cache
KT-48177 Scripts: OutOfMemoryException with circular @file:Import
KT-46645 Scripts: “IllegalStateException: No mapping for symbol: VALUE_PARAMETER INSTANCE_RECEIVER” caused by get accessor