CHANGELOG

1.3-RC

Compiler

New Features

• KT-17679 Support suspend fun main in JVM
• KT-24854 Support suspend function types for arities bigger than 22
• KT-26574 Support main entry-point without arguments in frontend, IDE and JVM

Performance Improvements

• KT-26490 Change boxing technique: instead of calling valueOf, allocate new wrapper type

Fixes

• KT-22069 Array class literals are always loaded as Array<*> from deserialized annotations
• KT-22892 Call of invoke function with lambda parameter on a field named suspend should be reported
• KT-24708 Incorrect WhenMappings code generated in case of mixed enum classes in when conditions
• KT-24853 Forbid KSuspendFunctionN and SuspendFunctionN to be used as supertypes
• KT-24866 Review support of all operators for suspend function and forbid all unsupported
• KT-25461 Mangle names of functions that have top-level inline class types in their signatures to allow non-trivial non-public constructors
• KT-25855 Load Java declarations which reference kotlin.jvm.functions.FunctionN as Deprecated with level ERROR
• KT-26071 Postpone conversions from signed constant literals to unsigned ones
• KT-26141 actual typealias for expect sealed class results in error “This type is sealed, so it can be inherited by only its own nested classes or objects”
• KT-26200 Forbid suspend functions annotated with @kotlin.test.Test
• KT-26219 Result of unsigned predecrement/preincrement is not boxed as expected
• KT-26223 Inline lambda arguments of inline class types are passed incorrectly
• KT-26291 Boxed/primitive types clash when overriding Kotlin from Java with common generic supertype with inline class type argument
• KT-26403 Add -impl suffix to box/unbox methods and make them synthetic
• KT-26404 Mangling: setters for properties of inline class types
• KT-26409 implies in CallsInPlace effect isn't supported
• KT-26437 Generate constructors containing inline classes as parameter types as private with synthetic accessors
• KT-26449 Prohibit equals-like and hashCode-like declarations inside inline classes
• KT-26451 Generate static methods with equals/hashCode implementations
• KT-26452 Get rid of $Erased nested class in ABI of inline classes
• KT-26453 Generate all static methods in inline classes with “-impl” suffix
• KT-26454 Prohibit @JvmName on functions that are assumed to be mangled
• KT-26468 Inline class ABI: Constructor invocation is not represented in bytecode
• KT-26480 Report error from compiler when suspension point is located between corresponding MONITORENTER/MONITOREXIT
• KT-26538 Prepare kotlin.Result to publication in 1.3
• KT-26558 Inline Classes: IllegalStateException when invoking secondary constructor for a primitive underlying type
• KT-26570 Inline classes ABI
• KT-26573 Reserve box, unbox, equals and hashCode methods inside inline class for future releases
• KT-26575 Reserve bodies of secondary constructors for inline classes
• KT-26576 Generate stubs for box/unbox/equals/hashCode inside inline classes
• KT-26580 Add version to kotlin.coroutines.jvm.internal.DebugMetadata
• KT-26659 Prohibit using kotlin.Result as a return type and with special operators
• KT-26687 Stdlib contracts have no effect in common code
• KT-26707 companion val of primitive type is not treated as compile time constant
• KT-26720 Write language version requirement on inline classes and on declarations that use inline classes
• KT-26859 Inline class misses unboxing when using indexer into an ArrayList
• KT-26936 Report warning instead of error on usages of Experimental/UseExperimental
• KT-26958 Introduce builder-inference with an explicit opt-in for it

IDE

New Features

• KT-26525 “Move Element Right/Left”: Support type parameters in where clause (multiple type constraints)

Fixes

• KT-22491 MPP new project/new module templates are not convenient
• KT-26428 Kotlin Migration in AS32 / AS33 fails to complete after “Indexing paused due to batch update” event
• KT-26484 Do not show -Xmulti-platform option in facets for common modules of multiplatform projects with the new model
• KT-26584 @Language prefix and suffix are ignored for function arguments
• KT-26679 Coroutine migrator should rename buildSequence/buildIterator to their new names
• KT-26732 Kotlin language version from IDEA settings is not taken into account when working with Java code
• KT-26770 Android module in a multiplatform project isn't recognised as a multiplatform module
• KT-26794 Bad version detection during migration in Android Studio 3.2
• KT-26823 Fix deadlock in databinding with AndroidX which led to Android Studio hanging
• KT-26827 ISE “Error type encountered: [ERROR : UInt] (UnresolvedType)” for data inline class wrapped unsigned type
• KT-26829 ISE “Error type encountered: [ERROR : UInt] (UnresolvedType)” for using as a field inline class wrapped unsigned type
• KT-26843 LazyLightClassMemberMatchingError$NoMatch: Couldn't match ClsMethodImpl:getX MemberIndex(index=1) (with 0 parameters) on inline class overriding inherited interface method defined in different files
• KT-26895 Exception while building light class for @Serializable annotated class

IDE. Android

• KT-26169 Android extensions are not recognised by IDE in multiplatform projects
• KT-26813 Multiplatform projects without Android target are not imported properly into Android Studio

IDE. Code Style, Formatting

• KT-22322 Incorrect indent after pressing Enter after annotation entry
• KT-26377 Formatter does not add blank line between annotation and type alias (or secondary constructor)

IDE. Decompiler

• KT-25853 IDEA hangs when Kotlin bytecode tool window open while editing a class with secondary constructor

IDE. Gradle

• KT-26634 Do not generate module for metadataMain compilation on new MPP import
• KT-26675 Gradle: Dependency on multiple files gets duplicated on import

IDE. Inspections and Intentions

New Features

• KT-17687 Quickfix for “Interface doesn't have constructors” to convert to anonymous object
• KT-24728 Add quickfix to remove single explicit & unused lambda parameter
• KT-25533 An intention to create actual implementations for expect members annotated with @OptionalExpectation
• KT-25621 Inspections for functions returning SuccessOrFailure
• KT-25969 Add an inspection for ‘flatMap { it }’
• KT-26230 Inspection: replace safe cast (as?) with if (instance check + early return)

Fixes

• KT-13343 Remove explicit type specification breaks code if initializer omits generics
• KT-19586 Create actual implementation does nothing when platform module has no source directories.
• KT-22361 Multiplatform: “Generate equals() and hashCode()” intention generates JVM specific code for arrays in common module
• KT-22552 SimplifiableCallChain should keep formatting and comments
• KT-24129 Multiplatform quick fix add implementation suggests generated source location
• KT-24405 False “redundant overriding method” for abstract / default interface method combination
• KT-24978 Do not highlight foldable if-then for is checks
• KT-25228 “Create function” from a protected inline method should not produce a private method
• KT-25525 @Experimental-related quick fixes are not suggested for usages in top-level property
• KT-25526 @Experimental-related quick fixes are not suggested for usages in type alias
• KT-25548 @Experimental API usage: “Add annotation” quick fix incorrectly modifies primary constructor
• KT-25609 “Unused symbol” inspection reports annotation used only in -Xexperimental/-Xuse-experimental settings
• KT-25711 “Deferred result is never used” inspection: remove experimental package (or whole FQN) from description
• KT-25712 “Redundant ‘async’ call” inspection quick fix action label looks too long
• KT-25883 False “redundant override” reported on boxed parameters
• KT-25886 False positive “Replace ‘if’ with elvis operator” for nullable type
• KT-25968 False positive “Remove redundant backticks” with keyword yield
• KT-26009 “Convert to ‘also’” intention adds an extra it expression
• KT-26015 Intention to move property to constructor adds @field: qualifier to annotations
• KT-26179 False negative “Boolean expression that can be simplified” for !true
• KT-26181 Inspection for unused Deferred result: report for all functions by default
• KT-26185 False positive “redundant semicolon” with if-else
• KT-26187 “Cascade if can be replaced with when” loses lambda curly braces
• KT-26289 Redundant let with call expression: don't report for long call chains
• KT-26306 “Add annotation target” quick fix adds EXPRESSION annotation, but not SOURCE retention
• KT-26343 “Replace ‘if’ expression with elvis expression” produces wrong code in extension function with not null type parameter
• KT-26353 “Make variable immutable” is a bad name for a quickfix that changes ‘var’ to ‘val’
• KT-26472 “Maven dependency is incompatible with Kotlin 1.3+ and should be updated” inspection is not included into Kotlin Migration
• KT-26492 “Make private” on annotated annotation produces nasty new line
• KT-26599 “Foldable if-then” inspection marks if statements that cannot be folded using ?. operator
• KT-26674 Move lambda out of parentheses is not proposed for suspend lambda
• KT-26676 ReplaceWith always puts suspend lambda in parentheses
• KT-26810 “Incompatible kotlinx.coroutines dependency” inspections report library built for 1.3-RC with 1.3-RC plugin

IDE. Multiplatform

• KT-20368 Unresolved reference to declarations from kotlin.reflect in common code in multi-platform project: no “Add import” quick-fix
• KT-26356 New MPP doesn't work with Android projects
• KT-26369 Library dependencies don't transitively pass for custom source sets at new MPP import to IDE
• KT-26414 Remove old multiplatform modules templates from New Project/New Module wizard
• KT-26517 Create actual ... generates default constructor parameter values
• KT-26585 Stdlib annotations annotated with @OptionalExpectation are reported with false positive error in common module

IDE. Navigation

• KT-18490 Multiplatform project: Set text cursor correctly to file with header on navigation from impl side

IDE. Refactorings

• KT-17124 Change signature refactoring dialog unescapes escaped parameter names
• KT-25454 Extract function: make default visibility private
• KT-26533 Move refactoring on interface shows it as “abstract interface” in the dialog

IDE. Tests Support

• KT-26793 Left gutter run icon does not appear for JS tests in old MPP

IDE. Ultimate

• KT-19309 Spring JPA Repository IntelliJ tooling with Kotlin

JavaScript

• KT-26466 Uncaught ReferenceError: println is not defined
• KT-26572 Support suspend fun main in JS
• KT-26628 Support main entry-point without arguments in JS

Libraries

New Features

• KT-25039 Any?.hashCode() extension
• KT-26359 Use JvmName on parameters of kotlin.Metadata to improve the public API
• KT-26398 Coroutine context shall perform structural equality comparison on keys
• KT-26598 Introduce ConcurrentModificationException actual typealias in the JVM library

Performance Improvements

• KT-18483 Check to contains value in range can be dramatically slow

Fixes

• KT-17716 JS: Some kotlin.js.Math methods break Integer type safety
• KT-21703 Review deprecations in stdlib for 1.3
• KT-21784 Deprecate and remove org.jetbrains.annotations from kotlin-stdlib in compiler distribution
• KT-22423 Deprecate mixed integer/floating point overloads of ClosedRange.contains operator
• KT-25217 Raise deprecation level for mod operators to ERROR
• KT-25935 Move kotlin.reflect interfaces to kotlin-stdlib-common
• KT-26358 Rebuild anko for new coroutines API
• KT-26388 Specialize contentDeepEquals/HashCode/ToString for arrays of unsigned types
• KT-26523 EXACTLY_ONCE contract in runCatching doesn't consider lambda exceptions are caught
• KT-26591 Add primitive boxing functions to stdlib
• KT-26594 Change signed-to-unsigned widening conversions to sign extending
• KT-26595 Deprecate common ‘synchronized(Any) { }’ function
• KT-26596 Rename Random.nextInt/Long/Double parameters
• KT-26678 Rename buildSequence/buildIterator to sequence/iterator
• KT-26929 Kotlin Reflect and Proguard: can’t find referenced class kotlin.annotations.jvm.ReadOnly/Mutable

Reflection

• KT-25499 Use-site targeted annotations on property accessors are not visible in Kotlin reflection if there's also an annotation on the property
• KT-25500 Annotations on parameter setter are not visible through reflection
• KT-25664 Inline classes don't work properly with reflection
• KT-26293 Incorrect javaType for suspend function's returnType

Tools. CLI

• KT-24613 Support argfiles in kotlinc with “@argfile”
• KT-25862 Release ‘-Xprogressive’ as ‘-progressive’
• KT-26122 Support single quotation marks in argfiles

Tools. Gradle

• KT-25680 Gradle plugin: version with non-experimental coroutines and no related settings still runs compiler with -Xcoroutines option
• KT-26253 New MPP model shouldn't generate metadataMain and metadataTest source sets on IDE import
• KT-26383 Common modules dependencies are not mapped at import of a composite multiplatform project with project dependencies into IDE
• KT-26515 Support -Xcommon-sources in new MPP
• KT-26641 In new MPP, Gradle task for building classes has a name unexpected for GradleProjectTaskRunner
• KT-26784 Support non-kts scripts discovery and compilation in gradle

Tools. JPS

• KT-26072 MPP compilation issue
• KT-26254 JPS build for new MPP model doesn't work: kotlinFacet?.settings?.sourceSetNames is empty

Tools. kapt

• KT-25374 Kapt: Build fails with Unresolved local class
• KT-26540 kapt3 fails to handle to-be-generated superclasses