Changelog

Compiler

New Features

• KT-48217 Add an annotation JvmDefaultWithCompatibility to allow generating DefaultImpls classes if -Xjvm-default=all option is used
• KT-49929 [FIR] Support programmatic creation of annotation class instances
• KT-49276 Warn about potential overload resolution change if Range/Progression starts implementing Collection
• KT-47902 Do not propagate method deprecation through overrides
• 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-24643 Prohibit using a type parameter declared for an extension property inside delegate
• KT-51747 Make KtCallableDeclaration.getContextReceivers default to preserve compatibility
• KT-49658 NI: False negative TYPE_MISMATCH on nullable type with when
• KT-43493 NI: @BuilderInference prevents compilation error of "Operator '==' cannot be applied to 'Long' and 'Int'"
• KT-51649 Kotlin/Native: reduce binary size of watchosArm32 and iosArm32 targets by limiting inlining of runtime functions
• KT-48626 JVM IR: incorrect behavior for captured for-loop parameter since 1.6.20-dev-723
• KT-51036 JVM / IR: "NullPointerException: Parameter specified as non-null is null" with synchronized and companion object
• KT-51471 Native: incorrect debug information when inheriting suspend fun invoke implementation
• KT-51352 "ClassCastException: class ScopeCoroutine cannot be cast to class Iterable" caused by coroutines and context receivers
• KT-51271 "ArrayIndexOutOfBoundsException: Index 3 out of bounds for length 3" with inlining of context function
• KT-47084 JVM IR: "AssertionError: inconsistent parent function for CLASS LAMBDA_IMPL" with tailrec function default parameter nested inline lambda
• KT-30616 Script: "Don't know how to generate outer expression" for top-level variable reference from static context (companion object, enum)
• KT-50520 "NPE: containingDeclaration.ac…lDeclarationType.REGULAR) must not be null" with implicit type on self-referencing lambda in a builder
• KT-51353 IncompatibleClassChangeError: Expected non-static field com.soywiz.korim.color.Colors.BLACK
• KT-48945 JVM IR: special bridge for get is not generated in a Map subclass
• KT-48499 Interface call with an inline/value parameter generates AbstractMethodError after rebuilding the module, but NOT the file.
• KT-49998 JVM: missing default value for annotation parameter of an unsigned type
• KT-49793 JVM: IncompatibleClassChangeError: Expected non-static field when property delegation uses receiver of another delegated property
• 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-50258 equals() returns false on the same enum instances if we check it for the second time in when
• KT-51062 Progressions resolve changing warning isn't reported for Java methods
• KT-48544 JVM / IR: "UnsupportedOperationException: Unknown structure of ADAPTER_FOR_CALLABLE_REFERENCE" with callable reference ::arrayOf
• 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-51040 Type inference fails on 1.6: "Cannot use 'CapturedType(*)' as reified type parameter" with EnumSet and elvis operator
• 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](https://github.com/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-50856 SAM conversion generates invalid bytecode for generics
• KT-45693 False negative INCOMPATIBLE_TYPES with when with generic subject
• KT-49903 JVM IR: InlineOnly optimization leads to behavior change for println with mutating System.out
• KT-51022 Fix error messages for resolution ambiguity with stub types
• KT-51035 PSI2IR: "org.jetbrains.kotlin.psi2ir.generators.ErrorExpressionException: null: KtCallExpression:" caused by recursive call of java function
• KT-50797 Implement fix for false negative UPPER_BOUND_VIOLATED with generic typealias using not all type parameters as arguments for underlying type
• KT-50878 Usage of contextual declarations from third-party library is allowed without -Xcontext-receivers
• 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-49729 Implement deprecation warning for private constructors of sealed classes
• KT-49349 Implement deprecation for invalid if as expression in rhs of elvis
• KT-46285 [SEALED_SUPERTYPE_IN_LOCAL_CLASS] Error message isn't adopted to local objects and sealed interfaces
• KT-49002 Allow OptIn marker on override if base class has the same marker
• 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](https://github.com/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-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-50277 Invalid bytecode generated for inline lambda in suspend function
• KT-50219 FIR DFA/CFA: no smart cast after null check and assignment
• 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-50278 FIR: accidental resolve to inaccessible value parameter
• KT-47483 JVM IR: "NoSuchElementException: Sequence contains no element matching the predicate" on compiling Array instantiation with TODO
• KT-50304 EXC_BAD_ACCESS at IntrinsicsNative.kt starting coroutine on object with suspend fun as supertype
• 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-47000 Allow graceful migration to -Xjvm-default=all-compatibility by allowing to inherit from interfaces even in the old (-Xjvm-default=disable) mode
• KT-50180 FIR: not enough information to infer type variable for definitely not null type
• KT-50163 FIR: ISE unsupported compile-time value BLOCK on complex annotations
• 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](https://github.com/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](https://github.com/OptIn) annotation
• KT-49411 JVM / IR: NullPointerException during IR lowering with [@JvmField](https://github.com/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-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-43604 Problem with initialization order
• 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-50004 Linking kotlinx.serialization crashes on Native and JS IR backends
• KT-49311 Missing FIR checker for unresolved references in import statement
• 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](https://github.com/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

Docs & Examples

• KT-50866 [Docs] [Kotlin/Native] Support non-NativeActivity Android executables
• KT-50220 [Docs] [Kotlin/JVM] New @JvmDefaultWithCompatibility annotation and changes in -Xjvm-default arguments behavior
• KT-50844 [Docs][K/JS] KJS / IR: Installation of NPM dependencies should be with ignore-scripts
• KT-50831 [Docs][K/JS] Gradle, JS: Ability to persist / reuse yarn.lock
• KT-51086 [Docs] [Build Tools] Allow to configure additional jvm arguments for 'KaptWithoutKotlincTask`
• KT-50563 [Docs] [Build Tools] Deprecate kotlin.experimental.coroutines Gradle DSL option and kotlin.coroutines property
• KT-50580 [Docs] [Kotlin/Native] Support instantiation of annotation classes on Native
• KT-50874 [Docs] [Language] Add ability to specify generic type parameters as not-null
• KT-50564 [Docs] [K/JS] Ensure that @AfterTest is invoked after the @Test function completes for asynchronous tests

IDE

New Features

• KTIJ-20169 Link to What's new in a notification about new Kotlin version

Performance Improvements

• KTIJ-20568 Optimize SubpackagesIndexService#hasSubpackages

Fixes

• KTIJ-13020 New compiler settings are applied only after the project is reloaded
• KTIJ-21154 StackOverflowError on Companion.extractPotentiallyFixableTypesForExpectedType that causes "Syntax highlighting has been temporarily turned off"
• KTIJ-20129 Load "[@NotNull](https://github.com/NotNull) T" types from libraries as definitely non-nullable if any module in project loads such types as definitely non-nullable
• KTIJ-9793 UAST: KotlinAbstractUElement.equals fails for psi-less elements
• KTIJ-16203 UAST: Annotating assignment expression sometimes leads to UnknownKotlinExpression
• KTIJ-18720 UAST: [@Deprecated](https://github.com/Deprecated)(level=DeprecationLevel.HIDDEN) makes method visibility be dropped
• KTIJ-18039 [@Deprecated](https://github.com/Deprecated)(level=HIDDEN) elements return false for isDeprecated()
• KTIJ-18716 KotlinUMethodWithFakeLightDelegate.hasAnnotation() doesn't find annotations
• KTIJ-20220 Kotlin plugin crashes very often
• KTIJ-20308 Syntax highlighting is temporary suspended for file ... due to internal error
• KTIJ-6085 Exception Incorrect CachedValue... with KtUltraLightMethodForSourceDeclaration
• KTIJ-18977 Do not show warning Outdated bundled kotlin compiler if there are no compatible plugin with newer compiler
• KTIJ-20253 Consider supporting special highlighting for definitely non-null types
• KT-42194 OOME: Java heap space from incremental compilation
• KTIJ-13019 "Add '-Xopt-in=kotlin.io.path.ExperimentalPathApi' to module untitled1 compiler arguments" only works until the project is reloaded

IDE. Completion

• KTIJ-20095 Optimize FilterOutKotlinSourceFilesScope#contains
• KTIJ-16250 Completion of override with return type annotated with TYPE_USE-targeted annotation suggests two duplicate entries

IDE. Debugger

• KTIJ-20716 JVM Debugger in common code can't get JVM-specific view on common code and fails
• KTIJ-18562 JVM debugger: coroutineContext.job causes "Failed to generate expression: KtNameReferenceExpression"
• KTIJ-20019 MPP Debugger: NSFE “Field not found” on accessing property with explicit getter from common code in Evaluate expression/Watcher
• KTIJ-19990 MPP Debugger: Evaluate expression for some stdlib in common source set fails with Method threw 'java.lang.ClassNotFoundException' exception.
• KTIJ-20929 MPP Debugger: in a project with single JVM target evaluation of expect function fails with 'NoSuchMethodError' exception in common context
• KTIJ-20956 Debugger: coroutine debugger fails to load sometimes
• KTIJ-20775 MPP Debugger: Evaluate expression for actual typealiases in jvm source set fails with Method threw 'java.lang.ClassNotFoundException' exception.
• KTIJ-20712 MPP Debugger: evaluator fails when evaluating expect function
• KTIJ-19344 K/N debugger shows all types as ObjHeader in variable view.

IDE. Gradle Integration

• KTIJ-20097 HMPP+Android Project that depends on pure Android Lib fails to import in IDEA
• KTIJ-20756 MPP targeting Android and JVM reports 'The feature "multi platform projects" is experimental and should be enabled explicitly'
• KTIJ-20745 Gradle: NSEE “Key main is missing in the map.” on project import in AS 212 + Kotlin 1.6.20
• KT-47570 MPP, IDE: kotlin-test-common leaks into dependencies of platform-specific source sets
• KTIJ-19541 IDE: Kotlin Facets aren't created for Gradle projects added via includeBuild
• KT-48882 MPP IDE import: Failing cinterop Gradle tasks shall not fail import
• KTIJ-18135 MPP, IDE: False positive "No value passed for parameter" in CommonTest when expect declaration has default value and actual does not

IDE. Inspections and Intentions

New Features

• KTIJ-12437 Add inspection to detect redundant (obsolete, unused) [@OptIn](https://github.com/OptIn) annotations
• KTIJ-15780 Add quickfix for migration of Experimental -> RequiresOptIn
• KTIJ-18865 Provide quick fixes for OptIn markers on forbidden targets
• KTIJ-18439 Make suggestions for applying opt-in quickfixes more distinct
• KTIJ-19985 Provide quickfix for SAFE_CALL_WILL_CHANGE_NULLABILITY diagnostic

Fixes

• KTIJ-20550 False positives in "Unnecessary [@OptIn](https://github.com/OptIn) annotation" inspection
• KTIJ-20993 Quick-fix for NULLABILITY_MISMATCH_BASED_ON_JAVA_ANNOTATIONS leads to unreachable code
• KTIJ-20557 Quick fix to add Any as an upper bound for type parameter to make it non-nullable
• KTIJ-20827 Process type mismatch compiler warnings to provide a corresponding quick fix
• KTIJ-12578 "Make abstract" quick fix for missing abstract members implementations could warn of potentially broken inheritance
• KTIJ-20425 Quick fix to replace [@NotNull](https://github.com/NotNull) parameter type T with a definitely non-nullable type T & Any
• KTIJ-19997 Inspection "Possibly blocking call in non-blocking context could lead to thread starvation" suggests "Wrap call in 'withContext'" resulting in red code
• KTIJ-18291 Quickfix "Add [@OptIn](https://github.com/OptIn)() annotation" adds the annotation to primary constructor when invoked on primary constructor parameter
• KTIJ-19512 Implement IDE support for new rules of deprecation inheritance
• KTIJ-20156 Exception when applying 'Convert to with'
• KTIJ-20290 Forbid "move to constructor" intention if class contains secondary constructor
• KTIJ-20288 Forbid "move to constructor" intention for actual classes with actual constructor
• KT-49736 Introduce import alias fails when qualifier is unresolved
• KTIJ-18743 "Redundant nullable return type" applied on actual method doesn't change the signature of expect
• KTIJ-12343 Inspection "Sealed sub-class has no state and no overridden equals" is applied incorrectly to expect/actual declarations of sealed classes with nested subclasses
• KTIJ-19406 The "Add [@OptIn](https://github.com/OptIn)(...)" quick fix does not shorten the annotation when adding an argument to the existing annotation
• KTIJ-12351 generate equals & hashCode() by identity intention generates incompilable code for multiplatform project modules
• KTIJ-13227 Forbid "move property to constructor" for actual classes with actual constructor having at least one parameter already
• KTIJ-11328 No quick fixes are suggested for annotation from experimental API used with file target
• KTIJ-14427 Meta-annotation value isn't updated for all the corresponding parts of a multiplatform annotation
• KTIJ-19735 NSME org.jetbrains.kotlin.idea.quickfix.KotlinSingleIntentionActionFactory org.jetbrains.kotlin.idea.quickfix.RemoveModifierFix on IJ212 + Kotlin master

IDE. Navigation

• KTIJ-18145 IDE freeze on 'Show Usage'

IDE. Refactorings. Extract Function

• KTIJ-10026 Refactor / Extract function: Adds unnecessary nullability annotations for parameters coming from NotNull or Nullable Java methods
• KTIJ-15823 Refactor / Extract Function: resulted declaration gets no [@OptIn](https://github.com/OptIn) from original function when necessary

IDE. Refactorings. Move

• KTIJ-5661 [Tests] MoveRefactoring: Fix ignored incorrect tests of crossmodule declaration moving

IDE. Wizards

• KTIJ-19232 New project wizard: delete MPP Mobile-Library and Application templates
• KTIJ-20878 Unable to create project with Kotlin Project Wizard when JDK 17 is used.
• KTIJ-20244 Compose MPP project from wizard requires minCompileSdk=31
• KTIJ-20781 Update kotlin-wrappers version in wizard

JS. Tools

• KT-47387 KJS: Support Apple Silicon for node distrib download

JavaScript

New Features

• KT-44494 KJS / IR: Allow enum classes to be exported
• KT-43224 KJS: Allow using inline classes in external types
• KT-35100 Make Char inline class in K/JS
• KT-42936 KJS IR: Support js-code test directives similar to legacy
• KT-47525 KJS / IR: Support protected members in d.ts generation
• KT-50110 KJS / IR: Enable properties lazy initialization by default

Performance Improvements

• KT-46443 KJS / IR: Improve CharArray and Char performance
• KT-45665 KJS / IR: equals on inline value classes is boxed
• KT-43644 KJS / IR: Avoid creating lambda classes

Fixes

• KT-51685 KJS / IR: TypeError: collection.iterator_jk1svi_k$ regression in Kotlin 1.6.20-RC2
• KT-51523 KJS IR: "Uncaught TypeError: a._get_length__2347802853_w7ahp7_k$ is not a function"
• KT-51700 KJS / IR: Compiler uses wrong function with List
• KT-51222 KJS / IR: "RangeError: Maximum call stack size exceeded": Default function overloads marked with @JsExport are broken
• KT-45054 KJS: Export secondary constructors as class static methods
• KT-37916 KJS: .d.ts generation not working for enum classes
• KT-48199 KJS / IR: Improve error message for linkage problems
• KT-51030 KJS / IR: internal class that implements public interface is missing getters
• KT-45434 KJS: "WRONG_EXPORTED_DECLARATION" when using JsExport on interfaces
• 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-44981 KJS / IR crashes on kotlin.js.js calls with complex constexpr
• KT-41964 KJS IR: Reference to local variable and parameter from js fun could be broken unexpectedly
• KT-50682 Kotlin/JS: IR + IC: TypeError "Cannot read properties of undefined" when properties from different sources refer one another in initializers
• KT-50175 Kotlin/JS, IR: with incremental compilation top level properties initialization is not lazy
• KT-40236 KJS: IR. Invalid override for external field with [@JsName](https://github.com/JsName)
• KT-46525 KJS / IR: Generate context-dependent names for lambdas and object expressions
• KT-49779 KJS / IR: Exported abstract class implementing interface not export interfaces member in d.ts
• KT-49773 KJS / IR: Exported enum implementing interface
• KT-41912 KJS / IR: generates invalid defineProperty methods for class hierarchies
• KT-46225 KJS IR: tailrec function with capturing lambda in default parameter value leads to UninitializedPropertyAccessException at compile time
• KT-50528 Kotlin/JS: IR + IC: TypeError: "combined.get_icpjjy_k$ is not a function" for code calling GlobalScope.launch {}
• KT-50512 KJS / IR: IC failed with const val in inline fun
• KT-49738 Ensure that @AfterTest is invoked after the [@Test](https://github.com/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](https://github.com/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-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-40525 KJS IR: investigate issues with using kotlin-wrappers
• KT-50197 KJS IR: using APIs in different packages but with same method name generates clashes
• KT-45958 KJS: Line breaks are missing in js files after If-expression
• KT-40213 KJS: fix and "unmute" cases from .../nonReifiedTypeParameters/ "muted" while fixing KT-38771
• KT-50152 Kotlin/JS: with incremental compilation browserRun / nodeRun produce no output
• KT-50315 Kotlin/JS: building project with some dependencies fails: IAE: "Duplicate definition"
• 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-19423 Script: reference from class to script top-level member is incompilable
• KT-21197 Support cross platform common implementations
• KT-42435 Prototype multiple receivers
• KT-48385 Deprecate confusing grammar in when-with-subject
• KT-49542 FIR: Smart cast may lead to inconsistent inference result
• KT-23727 Internal declarations from other module in star imports should have lower priority than public declarations from default imports
• KT-50251 Support language version 1.3 in Kotlin 1.6.20
• 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

New Features

• KT-49463 --dry-run flag for llvm_builder/package.py

Fixes

• KT-51359 Native: the compiler doesn't work on macOS 12.3 Beta
• KT-49144 Kotlin/Native executable early segmentation fault
• 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-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. Platforms

• KT-48078 Native: Support non-NativeActivity Android executables

Native. Runtime

• KT-48424 Support resolving source locations using libbacktrace
• KT-51586 SIGSEGV on worker7 test
• KT-50491 Kotlin/Native: Deadlock in the Ktor server tests with the new memory manager

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
• 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-50784 kotlin-android-extensions produces unbound symbol under _$_findViewCache
• 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-51309 Add JVM target bytecode version 18
• KT-48027 "Module ... cannot be found in the module graph" with module-info in META-INF/versions
• KT-50695 Compiling into IR backends with language version 1.3 is not rejected
• KT-46329 Deprecated -Xjvm-default values are not reported
• KT-51025 JVM CLI compiler takes class file from classpath instead of input java source file
• KT-50889 AnalysisHandlerExtension multiple round execution is broken on Kotlin/MultiPlatform with expectActualLinker=true flag
• 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-48568 [Commonizer] timespec properties are not commonized in kotlinx.coroutines
• KT-46257 MPP: Stdlib included more than once for an enabled hierarchical commonization
• KT-49735 [Commonizer] :commonizeNativeDistribution fails for projects with two or more same native targets
• KT-48856 MPP: Unable to resolve c-interop dependency for test compilation in an intermediate source set with the only platform
• 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. 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

New Features

• KT-48620 Add build information into Gradle build scan
• 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-51501 Gradle: 'java.lang.NoClassDefFoundError: com/gradle/scan/plugin/BuildScanExtension' on 1.6.0-RC when applying Enterprise Plugin from initscript
• KT-51588 Restoring from build cache breaks Kotlin incremental compilation
• KT-50620 Gradle Kotlin Plugin crashes in CI due to hostname resolving issue
• KT-49921 Setup basic release performance regression tests
• KT-51177 After updating from KGP 1.5.30 to 1.6.10, KotlinCompile is non-incremental given an Android resource change
• KT-48134 Debug log level causes build cache miss
• KT-50719 Kotlin Gradle Plugin may hang on writing statistics
• KT-48849 Cache miss due to empty directories in KotlinCompile inputs
• 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-49107 Configuration cache: undeclared kotlin.caching.enabled system property read
• 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

Performance Improvements

• KT-49037 KJS / Gradle: Configuration cache usage on large projects lead to high memory consumption by Gradle daemon

Fixes

• KT-51060 KJS / IR: Incorrect order of libraries with IC
• KT-49061 KJS / Gradle: Custom package.json handlers break configuration cache
• KT-35640 Kotlin/JS: Gradle: DCE devMode = true setting has no effect on incremental build
• KT-49095 KJS / Gradle: KotlinJsTest tasks increase configuration cache state size depending on number of modules in project
• KT-49253 KJS / Gradle: Error while evaluating property 'filteredArgumentsMap' of task ':compileProductionExecutableKotlinJs'
• 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-50930 KJS / IR: Incremental compilation cache building not consider multiple artifacts
• KT-50485 KJS / IR: Enable per-module by default
• 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
• KT-38040 Make Chrome Headless use "--no-sandbox" (configurable) - for Docker

Tools. Gradle. Multiplatform

• KT-46198 [Commonizer] c-interop commonization: Support publishing libraries compiled with commonized c-interop libraries
• KT-41641 MPP: NoSuchElementException: "Collection is empty" when android library is added but android() source set isn't
• KT-50567 commonizeNativeDistribution fails when enableGranularSourceSetsMetadata is set to true
• KT-50592 [Gradle][MPP] Mitigate isolated KGP classpath issues
• KT-51176 CInteropCommonization: Warn users about disabled cinterop commonization when cinterops are present in hmpp
• 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-49330 commonizeNativeDistribution: "ClassCastException: KotlinJvmProjectExtension_Decorated cannot be cast to class org.jetbrains.kotlin.gradle.dsl.KotlinProjectExtension"
• 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-50105 Usage of XCFramework and cocoapods plugin leads to error in prepareKotlinBuildScriptModel task
• 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-51434 Language version 1.7 is absent in Kotlin Compiler settings
• KT-48399 Internal Error: Unknown version of LookupSymbolKeyDescriptor=-6
• 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
• KT-45773 Improve quality of JPS incremental compilation

Tools. Kapt

• KT-41456 Kotlin compilation failure after successful kapt causes invalid incremental builds
• 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-48617 Cache miss due to empty directories in KaptGenerateStubsTask inputs
• KT-48450 Allow to configure additional jvm arguments for 'KaptWithoutKotlincTask`
• KT-32596 kapt replaces class generated by annotation processor with error.NonExistentClass when the class is used as an annotation
• 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-48758 Kotlin scripting: introduce a link from evaluation configuration to the compilation one
• KT-48414 Script: get location of the script.main.kts file
• 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

Tools. Wasm

• KT-49893 Don't publish wasm targets with org.jetbrains.kotlin.js.compiler attribute

| File | Sha256 | | --- | --- | | kotlin-compiler-1.6.20.zip | daf17db1c194f4205f3af67129367a69b388f819177963dc53a7b4b2c4d8ce22 | | kotlin-native-linux-x86_64-1.6.20.tar.gz | d967d6fd87056177ec520b00eee23b994389a1eb486c000af39d2d2fbbfbf3be | | kotlin-native-macos-x86_64-1.6.20.tar.gz | b53f93258b7ffe4b09e38cd6a5d87aed42a5d0f6f0fba6417e666e6ee12477f1 | | kotlin-native-macos-aarch64-1.6.20.tar.gz | 3c86d8388d986005095a57e7c58ea6237ac4915ab238feb5613c89fd9a335b6a | | kotlin-native-windows-x86_64-1.6.20.zip | 241f40852388c51da303931e5c7a4f4c86adca8510d0bd7479b7ac65ce86e3cc |

Changelog

Compiler

New Features

• KT-48217 Add an annotation JvmDefaultWithCompatibility to allow generating DefaultImpls classes if -Xjvm-default=all option is used
• KT-49929 [FIR] Support programmatic creation of annotation class instances
• KT-49276 Warn about potential overload resolution change if Range/Progression starts implementing Collection
• KT-47902 Do not propagate method deprecation through overrides
• 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-24643 Prohibit using a type parameter declared for an extension property inside delegate
• KT-51747 Make KtCallableDeclaration.getContextReceivers default to preserve compatibility
• KT-49658 NI: False negative TYPE_MISMATCH on nullable type with when
• KT-43493 NI: @BuilderInference prevents compilation error of "Operator '==' cannot be applied to 'Long' and 'Int'"
• KT-51649 Kotlin/Native: reduce binary size of watchosArm32 and iosArm32 targets by limiting inlining of runtime functions
• KT-48626 JVM IR: incorrect behavior for captured for-loop parameter since 1.6.20-dev-723
• KT-51036 JVM / IR: "NullPointerException: Parameter specified as non-null is null" with synchronized and companion object
• KT-51471 Native: incorrect debug information when inheriting suspend fun invoke implementation
• KT-51352 "ClassCastException: class ScopeCoroutine cannot be cast to class Iterable" caused by coroutines and context receivers
• KT-51271 "ArrayIndexOutOfBoundsException: Index 3 out of bounds for length 3" with inlining of context function
• KT-47084 JVM IR: "AssertionError: inconsistent parent function for CLASS LAMBDA_IMPL" with tailrec function default parameter nested inline lambda
• KT-30616 Script: "Don't know how to generate outer expression" for top-level variable reference from static context (companion object, enum)
• KT-50520 "NPE: containingDeclaration.ac…lDeclarationType.REGULAR) must not be null" with implicit type on self-referencing lambda in a builder
• KT-51353 IncompatibleClassChangeError: Expected non-static field com.soywiz.korim.color.Colors.BLACK
• KT-48945 JVM IR: special bridge for get is not generated in a Map subclass
• KT-48499 Interface call with an inline/value parameter generates AbstractMethodError after rebuilding the module, but NOT the file.
• KT-49998 JVM: missing default value for annotation parameter of an unsigned type
• KT-49793 JVM: IncompatibleClassChangeError: Expected non-static field when property delegation uses receiver of another delegated property
• 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-50258 equals() returns false on the same enum instances if we check it for the second time in when
• KT-51062 Progressions resolve changing warning isn't reported for Java methods
• KT-48544 JVM / IR: "UnsupportedOperationException: Unknown structure of ADAPTER_FOR_CALLABLE_REFERENCE" with callable reference ::arrayOf
• 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-51040 Type inference fails on 1.6: "Cannot use 'CapturedType(*)' as reified type parameter" with EnumSet and elvis operator
• 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](https://github.com/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-50856 SAM conversion generates invalid bytecode for generics
• KT-45693 False negative INCOMPATIBLE_TYPES with when with generic subject
• KT-49903 JVM IR: InlineOnly optimization leads to behavior change for println with mutating System.out
• KT-51022 Fix error messages for resolution ambiguity with stub types
• KT-51035 PSI2IR: "org.jetbrains.kotlin.psi2ir.generators.ErrorExpressionException: null: KtCallExpression:" caused by recursive call of java function
• KT-50797 Implement fix for false negative UPPER_BOUND_VIOLATED with generic typealias using not all type parameters as arguments for underlying type
• KT-50878 Usage of contextual declarations from third-party library is allowed without -Xcontext-receivers
• 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-49729 Implement deprecation warning for private constructors of sealed classes
• KT-49349 Implement deprecation for invalid if as expression in rhs of elvis
• KT-46285 [SEALED_SUPERTYPE_IN_LOCAL_CLASS] Error message isn't adopted to local objects and sealed interfaces
• KT-49002 Allow OptIn marker on override if base class has the same marker
• 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](https://github.com/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-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-50277 Invalid bytecode generated for inline lambda in suspend function
• KT-50219 FIR DFA/CFA: no smart cast after null check and assignment
• 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-50278 FIR: accidental resolve to inaccessible value parameter
• KT-47483 JVM IR: "NoSuchElementException: Sequence contains no element matching the predicate" on compiling Array instantiation with TODO
• KT-50304 EXC_BAD_ACCESS at IntrinsicsNative.kt starting coroutine on object with suspend fun as supertype
• 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-47000 Allow graceful migration to -Xjvm-default=all-compatibility by allowing to inherit from interfaces even in the old (-Xjvm-default=disable) mode
• KT-50180 FIR: not enough information to infer type variable for definitely not null type
• KT-50163 FIR: ISE unsupported compile-time value BLOCK on complex annotations
• 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](https://github.com/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](https://github.com/OptIn) annotation
• KT-49411 JVM / IR: NullPointerException during IR lowering with [@JvmField](https://github.com/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-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-43604 Problem with initialization order
• 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-50004 Linking kotlinx.serialization crashes on Native and JS IR backends
• KT-49311 Missing FIR checker for unresolved references in import statement
• 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](https://github.com/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

Docs & Examples

• KT-50866 [Docs] [Kotlin/Native] Support non-NativeActivity Android executables
• KT-50220 [Docs] [Kotlin/JVM] New @JvmDefaultWithCompatibility annotation and changes in -Xjvm-default arguments behavior
• KT-50844 [Docs][K/JS] KJS / IR: Installation of NPM dependencies should be with ignore-scripts
• KT-50831 [Docs][K/JS] Gradle, JS: Ability to persist / reuse yarn.lock
• KT-51086 [Docs] [Build Tools] Allow to configure additional jvm arguments for 'KaptWithoutKotlincTask`
• KT-50563 [Docs] [Build Tools] Deprecate kotlin.experimental.coroutines Gradle DSL option and kotlin.coroutines property
• KT-50580 [Docs] [Kotlin/Native] Support instantiation of annotation classes on Native
• KT-50874 [Docs] [Language] Add ability to specify generic type parameters as not-null
• KT-50564 [Docs] [K/JS] Ensure that @AfterTest is invoked after the @Test function completes for asynchronous tests

IDE

New Features

• KTIJ-20169 Link to What's new in a notification about new Kotlin version

Performance Improvements

• KTIJ-20568 Optimize SubpackagesIndexService#hasSubpackages

Fixes

• KTIJ-13020 New compiler settings are applied only after the project is reloaded
• KTIJ-21154 StackOverflowError on Companion.extractPotentiallyFixableTypesForExpectedType that causes "Syntax highlighting has been temporarily turned off"
• KTIJ-20129 Load "[@NotNull](https://github.com/NotNull) T" types from libraries as definitely non-nullable if any module in project loads such types as definitely non-nullable
• KTIJ-9793 UAST: KotlinAbstractUElement.equals fails for psi-less elements
• KTIJ-16203 UAST: Annotating assignment expression sometimes leads to UnknownKotlinExpression
• KTIJ-18720 UAST: [@Deprecated](https://github.com/Deprecated)(level=DeprecationLevel.HIDDEN) makes method visibility be dropped
• KTIJ-18039 [@Deprecated](https://github.com/Deprecated)(level=HIDDEN) elements return false for isDeprecated()
• KTIJ-18716 KotlinUMethodWithFakeLightDelegate.hasAnnotation() doesn't find annotations
• KTIJ-20220 Kotlin plugin crashes very often
• KTIJ-20308 Syntax highlighting is temporary suspended for file ... due to internal error
• KTIJ-6085 Exception Incorrect CachedValue... with KtUltraLightMethodForSourceDeclaration
• KTIJ-18977 Do not show warning Outdated bundled kotlin compiler if there are no compatible plugin with newer compiler
• KTIJ-20253 Consider supporting special highlighting for definitely non-null types
• KT-42194 OOME: Java heap space from incremental compilation
• KTIJ-13019 "Add '-Xopt-in=kotlin.io.path.ExperimentalPathApi' to module untitled1 compiler arguments" only works until the project is reloaded

IDE. Completion

• KTIJ-20095 Optimize FilterOutKotlinSourceFilesScope#contains
• KTIJ-16250 Completion of override with return type annotated with TYPE_USE-targeted annotation suggests two duplicate entries

IDE. Debugger

• KTIJ-20716 JVM Debugger in common code can't get JVM-specific view on common code and fails
• KTIJ-18562 JVM debugger: coroutineContext.job causes "Failed to generate expression: KtNameReferenceExpression"
• KTIJ-20019 MPP Debugger: NSFE “Field not found” on accessing property with explicit getter from common code in Evaluate expression/Watcher
• KTIJ-19990 MPP Debugger: Evaluate expression for some stdlib in common source set fails with Method threw 'java.lang.ClassNotFoundException' exception.
• KTIJ-20929 MPP Debugger: in a project with single JVM target evaluation of expect function fails with 'NoSuchMethodError' exception in common context
• KTIJ-20956 Debugger: coroutine debugger fails to load sometimes
• KTIJ-20775 MPP Debugger: Evaluate expression for actual typealiases in jvm source set fails with Method threw 'java.lang.ClassNotFoundException' exception.
• KTIJ-20712 MPP Debugger: evaluator fails when evaluating expect function
• KTIJ-19344 K/N debugger shows all types as ObjHeader in variable view.

IDE. Gradle Integration

• KTIJ-20097 HMPP+Android Project that depends on pure Android Lib fails to import in IDEA
• KTIJ-20756 MPP targeting Android and JVM reports 'The feature "multi platform projects" is experimental and should be enabled explicitly'
• KTIJ-20745 Gradle: NSEE “Key main is missing in the map.” on project import in AS 212 + Kotlin 1.6.20
• KT-47570 MPP, IDE: kotlin-test-common leaks into dependencies of platform-specific source sets
• KTIJ-19541 IDE: Kotlin Facets aren't created for Gradle projects added via includeBuild
• KT-48882 MPP IDE import: Failing cinterop Gradle tasks shall not fail import
• KTIJ-18135 MPP, IDE: False positive "No value passed for parameter" in CommonTest when expect declaration has default value and actual does not

IDE. Inspections and Intentions

New Features

• KTIJ-12437 Add inspection to detect redundant (obsolete, unused) [@OptIn](https://github.com/OptIn) annotations
• KTIJ-15780 Add quickfix for migration of Experimental -> RequiresOptIn
• KTIJ-18865 Provide quick fixes for OptIn markers on forbidden targets
• KTIJ-18439 Make suggestions for applying opt-in quickfixes more distinct
• KTIJ-19985 Provide quickfix for SAFE_CALL_WILL_CHANGE_NULLABILITY diagnostic

Fixes

• KTIJ-20550 False positives in "Unnecessary [@OptIn](https://github.com/OptIn) annotation" inspection
• KTIJ-20993 Quick-fix for NULLABILITY_MISMATCH_BASED_ON_JAVA_ANNOTATIONS leads to unreachable code
• KTIJ-20557 Quick fix to add Any as an upper bound for type parameter to make it non-nullable
• KTIJ-20827 Process type mismatch compiler warnings to provide a corresponding quick fix
• KTIJ-12578 "Make abstract" quick fix for missing abstract members implementations could warn of potentially broken inheritance
• KTIJ-20425 Quick fix to replace [@NotNull](https://github.com/NotNull) parameter type T with a definitely non-nullable type T & Any
• KTIJ-19997 Inspection "Possibly blocking call in non-blocking context could lead to thread starvation" suggests "Wrap call in 'withContext'" resulting in red code
• KTIJ-18291 Quickfix "Add [@OptIn](https://github.com/OptIn)() annotation" adds the annotation to primary constructor when invoked on primary constructor parameter
• KTIJ-19512 Implement IDE support for new rules of deprecation inheritance
• KTIJ-20156 Exception when applying 'Convert to with'
• KTIJ-20290 Forbid "move to constructor" intention if class contains secondary constructor
• KTIJ-20288 Forbid "move to constructor" intention for actual classes with actual constructor
• KT-49736 Introduce import alias fails when qualifier is unresolved
• KTIJ-18743 "Redundant nullable return type" applied on actual method doesn't change the signature of expect
• KTIJ-12343 Inspection "Sealed sub-class has no state and no overridden equals" is applied incorrectly to expect/actual declarations of sealed classes with nested subclasses
• KTIJ-19406 The "Add [@OptIn](https://github.com/OptIn)(...)" quick fix does not shorten the annotation when adding an argument to the existing annotation
• KTIJ-12351 generate equals & hashCode() by identity intention generates incompilable code for multiplatform project modules
• KTIJ-13227 Forbid "move property to constructor" for actual classes with actual constructor having at least one parameter already
• KTIJ-11328 No quick fixes are suggested for annotation from experimental API used with file target
• KTIJ-14427 Meta-annotation value isn't updated for all the corresponding parts of a multiplatform annotation
• KTIJ-19735 NSME org.jetbrains.kotlin.idea.quickfix.KotlinSingleIntentionActionFactory org.jetbrains.kotlin.idea.quickfix.RemoveModifierFix on IJ212 + Kotlin master

IDE. Navigation

• KTIJ-18145 IDE freeze on 'Show Usage'

IDE. Refactorings. Extract Function

• KTIJ-10026 Refactor / Extract function: Adds unnecessary nullability annotations for parameters coming from NotNull or Nullable Java methods
• KTIJ-15823 Refactor / Extract Function: resulted declaration gets no [@OptIn](https://github.com/OptIn) from original function when necessary

IDE. Refactorings. Move

• KTIJ-5661 [Tests] MoveRefactoring: Fix ignored incorrect tests of crossmodule declaration moving

IDE. Wizards

• KTIJ-19232 New project wizard: delete MPP Mobile-Library and Application templates
• KTIJ-20878 Unable to create project with Kotlin Project Wizard when JDK 17 is used.
• KTIJ-20244 Compose MPP project from wizard requires minCompileSdk=31
• KTIJ-20781 Update kotlin-wrappers version in wizard

JS. Tools

• KT-47387 KJS: Support Apple Silicon for node distrib download

JavaScript

New Features

• KT-44494 KJS / IR: Allow enum classes to be exported
• KT-43224 KJS: Allow using inline classes in external types
• KT-35100 Make Char inline class in K/JS
• KT-42936 KJS IR: Support js-code test directives similar to legacy
• KT-47525 KJS / IR: Support protected members in d.ts generation
• KT-50110 KJS / IR: Enable properties lazy initialization by default

Performance Improvements

• KT-46443 KJS / IR: Improve CharArray and Char performance
• KT-45665 KJS / IR: equals on inline value classes is boxed
• KT-43644 KJS / IR: Avoid creating lambda classes

Fixes

• KT-51685 KJS / IR: TypeError: collection.iterator_jk1svi_k$ regression in Kotlin 1.6.20-RC2
• KT-51523 KJS IR: "Uncaught TypeError: a._get_length__2347802853_w7ahp7_k$ is not a function"
• KT-51700 KJS / IR: Compiler uses wrong function with List
• KT-51222 KJS / IR: "RangeError: Maximum call stack size exceeded": Default function overloads marked with @JsExport are broken
• KT-45054 KJS: Export secondary constructors as class static methods
• KT-37916 KJS: .d.ts generation not working for enum classes
• KT-48199 KJS / IR: Improve error message for linkage problems
• KT-51030 KJS / IR: internal class that implements public interface is missing getters
• KT-45434 KJS: "WRONG_EXPORTED_DECLARATION" when using JsExport on interfaces
• 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-44981 KJS / IR crashes on kotlin.js.js calls with complex constexpr
• KT-41964 KJS IR: Reference to local variable and parameter from js fun could be broken unexpectedly
• KT-50682 Kotlin/JS: IR + IC: TypeError "Cannot read properties of undefined" when properties from different sources refer one another in initializers
• KT-50175 Kotlin/JS, IR: with incremental compilation top level properties initialization is not lazy
• KT-40236 KJS: IR. Invalid override for external field with [@JsName](https://github.com/JsName)
• KT-46525 KJS / IR: Generate context-dependent names for lambdas and object expressions
• KT-49779 KJS / IR: Exported abstract class implementing interface not export interfaces member in d.ts
• KT-49773 KJS / IR: Exported enum implementing interface
• KT-41912 KJS / IR: generates invalid defineProperty methods for class hierarchies
• KT-46225 KJS IR: tailrec function with capturing lambda in default parameter value leads to UninitializedPropertyAccessException at compile time
• KT-50528 Kotlin/JS: IR + IC: TypeError: "combined.get_icpjjy_k$ is not a function" for code calling GlobalScope.launch {}
• KT-50512 KJS / IR: IC failed with const val in inline fun
• KT-49738 Ensure that @AfterTest is invoked after the [@Test](https://github.com/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](https://github.com/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-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-40525 KJS IR: investigate issues with using kotlin-wrappers
• KT-50197 KJS IR: using APIs in different packages but with same method name generates clashes
• KT-45958 KJS: Line breaks are missing in js files after If-expression
• KT-40213 KJS: fix and "unmute" cases from .../nonReifiedTypeParameters/ "muted" while fixing KT-38771
• KT-50152 Kotlin/JS: with incremental compilation browserRun / nodeRun produce no output
• KT-50315 Kotlin/JS: building project with some dependencies fails: IAE: "Duplicate definition"
• 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-19423 Script: reference from class to script top-level member is incompilable
• KT-21197 Support cross platform common implementations
• KT-42435 Prototype multiple receivers
• KT-48385 Deprecate confusing grammar in when-with-subject
• KT-49542 FIR: Smart cast may lead to inconsistent inference result
• KT-23727 Internal declarations from other module in star imports should have lower priority than public declarations from default imports
• KT-50251 Support language version 1.3 in Kotlin 1.6.20
• 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

New Features

• KT-49463 --dry-run flag for llvm_builder/package.py

Fixes

• KT-51359 Native: the compiler doesn't work on macOS 12.3 Beta
• KT-49144 Kotlin/Native executable early segmentation fault
• 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-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. Platforms

• KT-48078 Native: Support non-NativeActivity Android executables

Native. Runtime

• KT-48424 Support resolving source locations using libbacktrace
• KT-51586 SIGSEGV on worker7 test
• KT-50491 Kotlin/Native: Deadlock in the Ktor server tests with the new memory manager

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
• 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-50784 kotlin-android-extensions produces unbound symbol under _$_findViewCache
• 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-51309 Add JVM target bytecode version 18
• KT-48027 "Module ... cannot be found in the module graph" with module-info in META-INF/versions
• KT-50695 Compiling into IR backends with language version 1.3 is not rejected
• KT-46329 Deprecated -Xjvm-default values are not reported
• KT-51025 JVM CLI compiler takes class file from classpath instead of input java source file
• KT-50889 AnalysisHandlerExtension multiple round execution is broken on Kotlin/MultiPlatform with expectActualLinker=true flag
• 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-48568 [Commonizer] timespec properties are not commonized in kotlinx.coroutines
• KT-46257 MPP: Stdlib included more than once for an enabled hierarchical commonization
• KT-49735 [Commonizer] :commonizeNativeDistribution fails for projects with two or more same native targets
• KT-48856 MPP: Unable to resolve c-interop dependency for test compilation in an intermediate source set with the only platform
• 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. 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

New Features

• KT-48620 Add build information into Gradle build scan
• 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-51501 Gradle: 'java.lang.NoClassDefFoundError: com/gradle/scan/plugin/BuildScanExtension' on 1.6.0-RC when applying Enterprise Plugin from initscript
• KT-51588 Restoring from build cache breaks Kotlin incremental compilation
• KT-50620 Gradle Kotlin Plugin crashes in CI due to hostname resolving issue
• KT-49921 Setup basic release performance regression tests
• KT-51177 After updating from KGP 1.5.30 to 1.6.10, KotlinCompile is non-incremental given an Android resource change
• KT-48134 Debug log level causes build cache miss
• KT-50719 Kotlin Gradle Plugin may hang on writing statistics
• KT-48849 Cache miss due to empty directories in KotlinCompile inputs
• 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-49107 Configuration cache: undeclared kotlin.caching.enabled system property read
• 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

Performance Improvements

• KT-49037 KJS / Gradle: Configuration cache usage on large projects lead to high memory consumption by Gradle daemon

Fixes

• KT-51060 KJS / IR: Incorrect order of libraries with IC
• KT-49061 KJS / Gradle: Custom package.json handlers break configuration cache
• KT-35640 Kotlin/JS: Gradle: DCE devMode = true setting has no effect on incremental build
• KT-49095 KJS / Gradle: KotlinJsTest tasks increase configuration cache state size depending on number of modules in project
• KT-49253 KJS / Gradle: Error while evaluating property 'filteredArgumentsMap' of task ':compileProductionExecutableKotlinJs'
• 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-50930 KJS / IR: Incremental compilation cache building not consider multiple artifacts
• KT-50485 KJS / IR: Enable per-module by default
• 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
• KT-38040 Make Chrome Headless use "--no-sandbox" (configurable) - for Docker

Tools. Gradle. Multiplatform

• KT-46198 [Commonizer] c-interop commonization: Support publishing libraries compiled with commonized c-interop libraries
• KT-41641 MPP: NoSuchElementException: "Collection is empty" when android library is added but android() source set isn't
• KT-50567 commonizeNativeDistribution fails when enableGranularSourceSetsMetadata is set to true
• KT-50592 [Gradle][MPP] Mitigate isolated KGP classpath issues
• KT-51176 CInteropCommonization: Warn users about disabled cinterop commonization when cinterops are present in hmpp
• 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-49330 commonizeNativeDistribution: "ClassCastException: KotlinJvmProjectExtension_Decorated cannot be cast to class org.jetbrains.kotlin.gradle.dsl.KotlinProjectExtension"
• 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-50105 Usage of XCFramework and cocoapods plugin leads to error in prepareKotlinBuildScriptModel task
• 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-51434 Language version 1.7 is absent in Kotlin Compiler settings
• KT-48399 Internal Error: Unknown version of LookupSymbolKeyDescriptor=-6
• 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
• KT-45773 Improve quality of JPS incremental compilation

Tools. Kapt

• KT-41456 Kotlin compilation failure after successful kapt causes invalid incremental builds
• 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-48617 Cache miss due to empty directories in KaptGenerateStubsTask inputs
• KT-48450 Allow to configure additional jvm arguments for 'KaptWithoutKotlincTask`
• KT-32596 kapt replaces class generated by annotation processor with error.NonExistentClass when the class is used as an annotation
• 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-48758 Kotlin scripting: introduce a link from evaluation configuration to the compilation one
• KT-48414 Script: get location of the script.main.kts file
• 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

Tools. Wasm

• KT-49893 Don't publish wasm targets with org.jetbrains.kotlin.js.compiler attribute

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