ChangeLog 1.6.X

1.6.21

Compiler

• KT-51979 "AssertionError: No modifier list, but modifier has been found by the analyzer" exception on incorrect Java interface override
• KT-51893 Duplicated [OVERRIDE_DEPRECATION] on overridden properties
• KT-51927 Native: The symbol of unexpected type encountered during IR deserialization error when multiple libraries have non-conflicting declarations with the same name
• KT-51843 Functional interface constructor references are incorrectly allowed in 1.6.20 without any compiler flags
• KT-51672 JVM IR: Inline class mangling issue in interface default methods split across multiple modules
• KT-51711 Compiler warning is displayed in case there is 'if' else branch used with elvis
• KT-49317 "IllegalStateException: Parent of this declaration is not a class: FUN LOCAL_FUNCTION_FOR_LAMBDA" with parameter of suspend type with the default parameter

IDE. Native

• KTIJ-20819 Native debugging support: "Debug is impossible without lldb binaries required by Kotlin/Native" on "Attach to process"

JavaScript

• KT-52010 K/JS IR: both flows execute when using elvis operator
• KT-51973 KJS / IR overridden properties of inherited interface missing
• KT-50504 KJS / IR: Transpiled JS incorrectly uses the unscrambled names of internal fields

Tools. Gradle

• KT-51837 kotlin-gradle-plugin:1.6.20 fails xray scan on shadowed Gson 2.8.6.

Tools. Gradle. Multiplatform

• KT-51810 MPP / Gradle: Dependency locking fails with 1.6.20
• KT-51765 com.android.lint in multiplatform project without android target should not trigger warning

1.6.20

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
• 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 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 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: <clinit> 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: <init> for object inherited from inner class
• KT-49070 FIR: ABSTRACT_CLASS_MEMBER_NOT_IMPLEMENTED with type parameter / class conflict
• KT-49133 FIR: protected java.lang.Throwable constructor is not available
• KT-49407 JVM / IR: "java.lang.VerifyError: Bad local variable type" with "Int.mod" inside "Long.mod" and non-trivial argument
• KT-44975 SUBCLASS_CANT_CALL_COMPANION_PROTECTED_NON_STATIC: confusing error message
• KT-38698 MANY_INTERFACES_MEMBER_NOT_IMPLEMENTED error message: interface is called a "class"
• KT-45001 Confusing warning message "This class can only be used with the compiler argument" for @OptIn annotation
• KT-49411 JVM / IR: NullPointerException during IR lowering with @JvmField property in loop range
• KT-49260 FIR: make FirBasedSymbol hierarchy to correspond FirDeclaration hierarchy
• KT-49289 FIR: false positive "return required" for if/else with inlined return in branch
• KT-49316 JVM / IR: "AssertionError: SyntheticAccessorLowering should not attempt to modify other files!" caused by unreachable code which try to modify val from the other package
• KT-45915 NoDescriptorForDeclarationException: Descriptor wasn't found for declaration FUN with circular module dependencies in JPS
• KT-49288 FIR2IR: consider generating all fake override calls properly
• KT-42784 FIR2IR: first create fake overrides, then bind overridden to them
• KT-48816 Kotlin/Native Symbol for public platform.darwin/NSObject|null[100] is unbound
• KT-49372 JVM / IR: Incorrect work of the loop optimization for mutable variable
• KT-49356 Native: UnsupportedOperationException: RETURNABLE_BLOCK caused by nested return with boxing and inline
• KT-49659 JVM IR: Missing value class mangling in SAM wrappers for fun interfaces from different modules
• KT-47101 Incorrect scope for supertypes in companion objects
• KT-49360 Invalid LLVM module: "inlinable function call in a function with debug info must have a !dbg location"
• KT-48430 JVM: ClassCastException with inline class as generic argument for type parameter used in a function type
• KT-49575 IllegalArgumentException: Unhandled intrinsic in ExpressionCodegen with circular module dependencies in JPS
• KT-47669 IR inliner doesn't handle inner class functions referring outer this
• KT-48668 JVM IR: "ISE: Value at CLASS must not be null for CLASS" for modules with a dependency cycle
• KT-49370 JVM / IR: "java.lang.VerifyError: Bad local variable type" with "fun Long.mod" and non-trivial argument
• KT-46744 Memory Leaks in Kotlin daemon
• KT-48806 False-negative USED_AS_EXPRESSION for unreachable catch clauses
• KT-45972 FIR: type is incorrectly resolved to private
• KT-46968 Remove FirCompositeScope from type resolve
• KT-49072 FIR: accidental resolve to private-in-file type
• KT-34822 FIR scopes: deal with nested / inner classes and type parameter priority
• KT-49702 Exception from RENDER_WHEN_MISSING_CASES diagnostic on malformed sealed class inheritor
• KT-49860 [FIR] Add smartcast expression to synthetic subj access
• KT-49836 Inference fails on lambda and adjacent function expressions with receiver
• KT-49832 Inference fails on lambda for function types with extension parameter
• KT-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 (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-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 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(level=DeprecationLevel.HIDDEN) makes method visibility be dropped
• KTIJ-18039 @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 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' 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 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() 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(...)" 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 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<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
• 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 function completes for asynchronous tests
• KT-45542 KJS / IR: "IllegalStateException" for method with default argument in expect class
• KT-50464 KJS IR: Functions with optional parameters and stable names are exported without @JsExport
• KT-43374 KJS / IR: "class org.jetbrains.kotlin.js.backend.ast.JsIf cannot be cast to class org.jetbrains.kotlin.js.backend.ast.JsExpressionStatement" caused by if-else expression inside when
• KT-20791 ushr Behavior differs in Javascript and Java targets
• KT-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<Float>

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

1.6.10

Android

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

Compiler

Performance Improvements

• KT-49821 Optimize LazyClassMemberScope#getContributedDescriptors: use nameFilter

Fixes

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

JavaScript

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

Language Design

• KT-49868 Support language version 1.3 in Kotlin 1.6.10

Libraries

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

Tools. Android Extensions

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

Tools. Compiler Plugins

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

Tools. Gradle

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

Tools. Gradle. JS

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

Tools. Gradle. Native

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

Tools. Incremental Compile

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

1.6.0

Android

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

Compiler

New Features

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

Performance Improvements

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

Fixes

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

Docs & Examples

• KT-48534 Wrong compiler argument for RequiresOptIn

IDE

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

IDE. Debugger

• KT-47970 AE: "Either library or explicit name have to be provided <built-ins module>" in IR debugger tests

IDE. Gradle Integration

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

IDE. Multiplatform

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

JavaScript

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

Libraries

New Features

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

Performance Improvements

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

Fixes

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

Native

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

Native. C Export

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

Native. C and ObjC Import

• KT-48074 Native: cinterop: __flexarr support

Native. ObjC Export

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

Native. Platforms

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

Native. Runtime

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

Native. Runtime. Memory

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

Native. Stdlib

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

Reflection

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

Tools. CLI

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

Tools. Commonizer

New Features

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

Fixes

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

Tools. Compiler Plugins

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

Tools. Gradle

Performance Improvements

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

Fixes

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

Tools. Gradle. JS

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

Tools. Gradle. Multiplatform

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

Tools. Gradle. Native

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

Tools. Kapt

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

Tools. Scripts

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