Kotlin 1.4.0

erokhins released this 14 Aug 15:50

· 63 commits to 1.4.0 since this release

0ddb793

Contents

The release contents the JVM version of the Kotlin compiler, and also the Kotlin/Native compiler for the supported platforms: Linux, macOS and Windows.

Changelog

1.4.0

Compiler

New Features

KT-23729 Provide a way to generate JVM default method bodies in interfaces delegating to DefaultImpls
KT-30330 Introduce KotlinNothingValueException and throw it instead of NPE on expressions of type Nothing
KT-38435 Support suspend conversion on callable references in JVM backend

Fixes

KT-35483 NI: compatibility mode
KT-39728 Declarations from kotlin.reflect resolved to expect-classes even in JVM modules in IDE
KT-40153 REPL IDE services completion fails on imports completion
KT-40404 Mixed named/positional arguments: argument can be passed twice
KT-40544 NI: "TYPE_MISMATCH: Required: MutableList<out T!> Found: List" caused by Java interface function
KT-40555 NI: Spread operator allows inferred nullable types
KT-40646 NI: TYPE_MISMATCH: "inferred type is Unit but Observer was expected" caused by LieData.observe inference
KT-40691 False positive CAPTURED_VAL_INITIALIZATION with EXACTLY_ONCE contract
KT-40693 UnsupportedOperationException: no descriptor for type constructor of (CapturedType(out TResult)..CapturedType(out TResult)?)
KT-40824 Usages of a typealias lose nullability and annotations in deserialization
KT-40843 Unhandled exception for suspending methods that return Result type
KT-40869 Recursion computation inside compiler resolve on a correct code
KT-40893 Error "Captured values initialization is forbidden due to possible reassignment" when attempting to use the plusAssign operator with a java list inside an inline function
KT-40919 kotlin.collections.ArrayDeque requires an explicit import when compiling with kotlinc 1.4-RC and -language-version 1.3
KT-40920 Regression in JvmDefault: incorrect access to missing DefaultImpls on default methods in Java interface overriding Kotlin interface
KT-40978 Prohibit using suspend functions as SAM in fun interfaces

Kotlin/Native

Objective-C/Swift interop:
- Reworked exception handling (GH-3822, GH-3842)
- Enabled support for Objective-C generics by default (GH-3778)
- Support for Kotlin’s suspending functions (GH-3915)
- Handle variadic block types in ObjC interop (KT-36766)
Added native-specific frontend checkers (implemented in the main Kotlin repository: GH-3293, GH-3091, GH-3172)
.dSYMs for release binaries on Apple platforms (GH-4085)
Improved compilation time of builds with interop libraries by reworking cinterop under the hood.
Experimental mimalloc allocator support (-Xallocator=mimalloc) to improve execution time performance. (GH-3704)
Tune GC to improve execution time performance
Various fixes to compiler caches and Gradle daemon usage

Docs & Examples

KT-35218 Fix misleading in JavaDoc for createTempDir/createTempFile
KT-36981 Provide a visual illustration of source sets structure generated by ios(), watchos(), tvos() presets
KT-38050 Language Guide: MPP reference: add sample of language settings for all roots instead of common root only

IDE

KT-30265 IDE, MPP: False negative TYPE_PARAMETER_AS_REIFIED in common code
KT-40494 UAST: "NoSuchElementException: No element of given type found" with use-site target annotation
KT-40639 Shift IDE plugins updater numbers for Kotlin plugin

IDE. Code Style, Formatting

KT-40636 Hard freeze on formatter: infinite recursion

IDE. Gradle Integration

KT-30116 IDE: Unresolved reference in MPP module (androidMain source set) for annotation from common module (defined in commonMain and with JVM target)

IDE. Gradle. Script

KT-34552 Deadlock in ScriptDefinitionsManager
KT-40675 Gradle build file is not highlighted until navigating to symbol

IDE. JS

KT-40461 Create new projects with kotlin.js.generate.executable.default=false

IDE. Script

KT-39547 Kotlin script support freezes IDEA
KT-40242 gradle.kts: Deadlock in ScriptClassRootsUpdater

IDE. Wizards

KT-36153 New Project Wizard: provide more referential info on project structure editor screen
KT-39904 New Project wizard 1.4: update Frontend Application to make it run with JS IR
KT-40149 Gradle project wizard: templates for Kotlin/JS are not properly formatted

JavaScript

KT-25859 JS: support function references to functions with vararg if expected type ends with repeated vararg element type
KT-40083 K/JS-IR: java.lang.IllegalStateException: has not acquired a symbol yet
KT-40892 KJS, IR: Unresolved references on importing classes from kotlinx-nodejs

Libraries

KT-39051 Libraries native artifacts are published without sources

Tools. Gradle

KT-27816 Provide a possibility to specify intermediate source sets between platform-agnostic and platform-specific test source sets
KT-37720 Replace ArtifactTransform with TransformAction
KT-40559 Adding the stdlib by default triggers warning in the Android Gradle Plugin

Tools. Gradle. JS

KT-40093 Incorrect updating version of Kotlin/JS dependencies in package.json

Tools. Gradle. Multiplatform

KT-27320 Provide a way to reuse same sources for similar Native target
KT-40058 NPE from mpp gradle plugin on kotlinx.benchmarks

Tools. Gradle. Native

KT-40801 Gradle CocoaPods integration: Cannot change a framework name

1.4-RC

Backend. Native

KT-40209 java.lang.UnsupportedOperationException: org.jetbrains.kotlin.ir.declarations.impl.IrValueParameterImpl@76484173
KT-40367 Kotlin/Native-Swift interop (iOS): Array member initialization failing in release builds

Compiler

Fixes

KT-31025 Type mismatch when callable reference is resolved with a functional expected type and SAM conversion
KT-37388 Consider relaxing rules about inferring Nothing inside special constructions (if, try, when)
KT-37717 NI: "IllegalStateException: Error type encountered" with @BuilderInference
KT-38427 New inference in branched conditions (if, when) results in odd behavior with inconsistent compiler warnings and runtime errors
KT-38899 NI: False positive IMPLICIT_NOTHING_TYPE_ARGUMENT_IN_RETURN_POSITION leads to NPE
KT-39468 NI: overload resolution ambiguity between functions passing T and Foo<T> with a contravariant receiver
KT-39618 NEW_INFERENCE_NO_INFORMATION_FOR_PARAMETER: unable to infer generic type on @BuilderInference annotated lambda parameter with receiver type
KT-39633 NI: Incorrect type parameter instantiation based on contravariant type argument
KT-39691 NI: Missing SAM conversion for nullable lambda
KT-39860 Make Kotlin binaries publicly available (set KotlinCompilerVersion.IS_PRE_RELEASE = false)
KT-39900 NI: Incorrect type inference in a lambda returning Unit
KT-39925 New JVM default compilation mode doesn't check that JVM target is 1.8
KT-39943 Write information about all-compatibility mode in metadata
KT-39953 NI: ClassCastException "cannot be cast to java.lang.Void" with if-else in return statement in ANdroid project
KT-40045 NI: lambda’s receiver type isn't inferred properly
KT-40057 NI: provideDelegate org.jetbrains.kotlin.codegen.CompilationException: Back-end (JVM) Internal error: wrong bytecode generated for static initializer
KT-40060 NI: postponed variable from the builder inference flows to back-end and leads to throw an exception
KT-40112 Kotlin Gradle DSL: COMPATIBILITY_WARNING on kotlin.sourceSets block
KT-40113 Kotlin Gradle DSL: "Expression 'main' cannot be invoked as a function" for distributions.main DSL block
KT-40128 Introduce compiler key to disable compatibility resolution mechanism for new inference features
KT-40151 NI: postponed variable isn't substituted for top-level CR inside builder inference
KT-40214 AbstractMethodError in gradle subplugin which is used in Android app
KT-40234 Deprecation level "hidden" has no effect on callable reference argument
KT-40247 NI: false positive "function should be called from coroutine or another suspend function" for suspend invoke operator in try-catch
KT-40254 Rewrite at slice with two callable reference arguments
KT-40269 NI: "disabled Unit conversions" error has appeared on green code
KT-40337 NI: false positive "function should be called from coroutine or another suspend function" for suspend invoke operator in when block
KT-40406 Prohibit reflection on adapted callable references

IDE

KT-39968 Paths in KotlinJavaRuntime library aren't updated after you run IDE from a different directory
KT-39989 NullPointerException when opening Kotlin facets in Project Structure dialog in IDEA 192
KT-40311 Create change_notes for 1.4 in IDE plugin description

IDE. Debugger

KT-39808 (CoroutineDebugger) Doesn't start with kotlinx-coroutines-core >= 1.3.6
KT-40073 (CoroutineDebugger) Change minimum supported kotlinx.coroutines version to 1.3.8*
KT-40172 Restored frame variables isn't shown for suspended coroutines
KT-40635 Coroutines Debugger: make IDE plugin accept coroutines 1.3.8-rc* versions as well

IDE. Gradle Integration

KT-38744 No dependency between Android test and commonTest source sets with kotlin.mpp.enableGranularSourceSetsMetadata=true
KT-39037 'None of the consumable configurations have attributes' in MPP IDE import with transitive project dependency on self

IDE. Gradle. Script

KT-31137 IntelliJ would get very slow when editing gradle buildSrc(using the kotlin dsl)
KT-36078 Gradle Kotlin script context is not reloaded when gradle/wrapper/gradle-wrapper.properties file is changed
KT-39317 ISE “Calling invokeAndWait from read-action leads to possible deadlock.” on importing simple Gradle-based project in nightly IJ

IDE. Inspections and Intentions

KT-28662 Inspection to flag usage of the wrong Transient annotation on Kotlin Serializable class
KT-34209 Switch default behaviour in 1.4 for insertion (to build script) via quick fix of the compiler option enabling inline classes
KT-36131 Suggest to add a missing module dependency on an unresolved reference in Kotlin code
KT-37462 Add "Add dependency to module" quickfix in multimodule Maven project
KT-39869 Add whole project migration usages of kotlin.browser.* & kotlin.dom.* to kotlinx.browser.* & kotlinx.dom.* respectively

IDE. Wizards

KT-40004 New Project wizard 1.4+: no https://dl.bintray.com/kotlin/kotlinx repository is added for kotlinx-html
KT-40037 New Project wizard: update Ktor version
KT-40092 Wizard: the templates panel on mac OS is too wide
KT-40232 New Wizard: Android Sdk path doesn't have backslash escaping on Windows
KT-40371 New Project Wizard: Frontend Application / Library results in broken run configuration
KT-40377 New Project Wizard: Frontend Application defines NPM dependencies that are unnecessary with Kotlin 1.4-RC+
KT-40378 New Project Wizard: Frontend Application, Disabling JavaScript test framework has no effect
KT-40407 Wizard: do not add stdlib by default for Gradle projects in wizard

JS. Tools

KT-39984 Update dukat version in toolchain near to release of 1.4-RC

JavaScript

KT-32186 Make sure K/JS Reflection API documentation is correct and fix it.
KT-37563 K/JS: stacktrace is not captured for exceptions without primary constructor inherited from Exception/Error
KT-37752 Generated typescript incorrect for constructors of derived classes
KT-37883 KJS: Generated TypeScript uses 'declare' rather than 'export'
KT-38771 JS: support non-reified type parameters in typeOf
KT-39873 Update Kotlin JavaScript wrappers due to NON_EXPORTABLE_TYPE diagnostic introduction
KT-40126 [JS / IR] NPE while compiling interfaces with invoke which is passed as a delegate
KT-40216 KJS / IR: AssertionError caused by an anonymous object in the dependency project

Libraries

KT-33069 StringBuilder common functions
KT-35972 Add contract to builder functions
KT-37101 Mark following api with DeprecatedSinceKotlin("1.4")
KT-38360 Make sure that JB libraries correctly define their npm deps and republish them (after KT-30619)
KT-38817 'capitalize' should convert digraphs to title case
KT-40168 Remove StringBuilder.capacity from common and JS parts

Middle-end. IR

KT-40520 Assert during fake-override generation

Tools. Commonizer

KT-40199 Commonizer loses nullability of abbreviated types

Tools. Compiler Plugins

KT-40036 Add diagnostic that shows is serialization plugin compatible with serialization-runtime

Tools. Gradle

KT-39755 [KJS / Gradle / Legacy mode] Directory with whitespace is not processed
KT-39809 Kotlin Gradle plugin: ServiceConfigurationError: org.jetbrains.kotlin.gradle.plugin.KotlinGradleSubplugin: Provider org.jetbrains.kotlin.gradle.internal.AndroidSubplugin not a subtype
KT-39977 Collect statistics of used -Xjvm-default options
KT-40300 Fail the build if in MPP plugin no targets configured

Tools. Gradle. JS

KT-38170 Investigate how to improve migration experience from pre 1.4.0 DSL to the new one
KT-39654 Default CSS settings in webpack has priority over user's settings
KT-39842 Kotlin/JS Gradle DSL: peerNpm dependency fails
KT-40048 [Gradle, JS] Deprecate kotlin-frontend plugin
KT-40067 [Gradle, JS] Public package.json for mixed JS/TS project
KT-40210 Fail the build when Kotlin/JS target is not (properly) configured
KT-40320 Gradle JS: make migration to the new Gradle DSL smoother

Tools. Gradle. Multiplatform

KT-32239 Custom configurations inside Kotlin JVM Gradle projects can't properly resolve multiplatform dependencies
KT-39897 [Commonizer] Fast-pass for library fragments absent for some targets

Tools. J2K

KT-39739 J2K: Access is allowed from event dispatch thread with IW lock only

Tools. kapt

KT-34604 KAPT: Flaky NPE through org.jetbrains.kotlin.kapt3.base.ProcessorLoader.doLoadProcessors
KT-36302 TypeTreeVisitor.visitMemberSelect IllegalStateException: node.sym must not be null on JDK 11
KT-39876 KAPT: Serialization of classpath structure is incorrect if there are dependencies between types in jar/dir

1.4-M3

Compiler

New Features

KT-23575 Deprecate with replacement and SinceKotlin
KT-38652 Do not generate optional annotations to class files on JVM
KT-38777 Hide Throwable.addSuppressed member and prefer extension instead

Performance Improvements

KT-38489 Compilation of kotlin html DSL increasingly slow
KT-28650 Type inference for argument type is very slow if several interfaces with a type parameter is used as an upper bound of a type parameter

Fixes

KT-15971 Incorrect bytecode generated when inheriting default arguments not from the first supertype
KT-25290 NI: "AssertionError: If original type is SAM type, then candidate should have same type constructor" on out projection of Java class
KT-28672 Contracts on calls with implicit receivers
KT-30279 Support non-reified type parameters in typeOf
KT-31908 NI: CCE on passing lambda to function which accepts vararg SAM interface
KT-32156 New inference issue with generics
KT-32229 New inference algorithm not taking into account the upper bound class
KT-33455 Override equals/hashCode in functional interface wrappers
KT-34902 AnalyzerException: Argument 1: expected I, but found R for unsigned types in generic data class
KT-35075 AssertionError: "No resolved call for ..." with conditional function references
KT-35468 Overcome ambiguity between typealias kotlin.Throws and the aliased type kotlin.jvm.Throws
KT-35494 NI: Multiple duplicate error diagnostics (in IDE popup) with NULL_FOR_NONNULL_TYPE
KT-35681 Wrong common supertype between raw and integer literal type leads to unsound code
KT-35937 Error "Declaration has several compatible actuals" on incremental build
KT-36013 Functional interface conversion not happens on a value of functional type with smart cast to a relevant functional type
KT-36045 Do not depend on the order of lambda arguments to coerce result to Unit
KT-36448 NI: fix tests after enabling NI in the compiler
KT-36706 Prohibit functional interface constructor references
KT-36969 Generate @NotNull on instance parameters of Interface$DefaultImpls methods
KT-37058 Incorrect overload resolution ambiguity on callable reference in a conditional expression with new inference
KT-37120 [FIR] False UNRESOLVED_REFERENCE for public and protected member functions and properties which are declared in object inner class
KT-37149 Conversion when generic specified by type argument of SAM type
KT-37249 false TYPE_MISMATCH when When-expression branches have try-catch blocks
KT-37341 NI: Type mismatch with combination of lambda and function reference
KT-37436 AME: "Receiver class does not define or inherit an implementation of the resolved method" in runtime on usage of non-abstract method of fun interface
KT-37510 NI infers java.lang.Void from the expression in a lazy property delegate and throws ClassCastException at runtime
KT-37541 SAM conversion with fun interface without a function fails on compiling and IDE analysis in SamAdapterFunctionsScope.getSamConstructor()
KT-37574 NI: Type mismatch with Kotlin object extending functional type passed as @FunctionalInterface to Java
KT-37630 NI: ILT suitability in a call is broken if there are CST calculation and calling function's type parameters
KT-37665 NI: applicability error due to implicitly inferred Nothing for returning T with expected type
KT-37712 No extension receiver in functional interface created with lambda
KT-37715 NI: VerifyError: Bad type on operand stack with varargs generic value when type is inferred
KT-37721 NI: Function reference with vararg parameter treated as array and missing default parameter is rejected
KT-37887 NI: Smart casting for Map doesn't work if the variable is already "smart casted"
KT-37914 NI: broken inference for a casting to subtype function within the common constraint system with this subtype
KT-37952 NI: improve lambdas completion through separation the lambdas analysis into several steps
KT-38069 Callable reference adaptation should have dependency on API version 1.4
KT-38143 New type inference fails when calling extension function defined on generic type with type arguments nested too deep
KT-38156 FIR Metadata generation
KT-38197 java.lang.OutOfMemoryError: Java heap space: failed reallocation of scalar replaced objects
KT-38259 NEW_INFERENCE_NO_INFORMATION_FOR_PARAMETER for provideDelegate
KT-38337 Map delegation fails for inline classes
KT-38401 FIR: protected effective visibility is handled unprecisely
KT-38416 FIR: infinite loop in BB coroutine test 'overrideDefaultArgument.kt'
KT-38432 FIR: incorrect effective visibility in anonymous object
KT-38434 Implement resolution of suspend-conversion on FE only, but give error if suspend conversion is called
KT-38437 [FIR] String(CharArray) is resolved to java.lang.String constructor instead of kotlin.text.String pseudo-constructor
KT-38439 NI: anonymous functions without receiver is allowed if there is an expected type with receiver
KT-38473 FIR: ConeIntegerLiteralType in signature
KT-38537 IllegalArgumentException: "marginPrefix must be non-blank string" with raw strings and space as margin prefix in trimMargin() call
KT-38604 Implicit suspend conversion on call arguments doesn't work on vararg elements
KT-38680 NSME when calling generic interface method with default parameters overriden with inline class type argument
KT-38681 Wrong bytecode generated when calling generic interface method with default parameters overriden with primitive type argument
KT-38691 NI: overload resolution ambiguity if take R and () -> R, and pass literal lambda, which returns R
KT-38799 False positive USELESS_CAST for lambda parameter
KT-38802 Generated code crashes by ClassCastException when delegating with inline class
KT-38853 Backend Internal error: Error type encountered: Unresolved type for nested class used in an annotation argument on an interface method
KT-38890 NI: false negative Type mismatch for values with fun keyword
KT-39010 NI: Regression with false-positive smartcast on var of generic type
KT-39013 202, ASM 8: "AnalyzerException: Execution can fall off the end of the code"
KT-39260 "AssertionError: Unsigned type expected: Int" in range
KT-39305 NEW_INFERENCE_NO_INFORMATION_FOR_PARAMETER: unable to infer deeply nested type bound when class implements generic interface
KT-39408 Using unsigned arrays as generics fails in 1.4-M2 with class cast exception
KT-39533 NI: Wrong overload resolution for methods with SAM converted function reference arguments
KT-39535 NI: Inference fails for the parameters of SAM converted lambdas with type parameters
KT-39603 Require explicit override in JVM default compatibility mode on implicit generic specialization of inherited methods in classes
KT-39671 Couldn't inline method call 'expectBody'
KT-39816 NI:ClassCastException and no IDE error with provideDelegate when DELEGATE_SPECIAL_FUNCTION_MISSING in OI
KT-32779 Rewrite at slice in array access resolution in coroutine inference
KT-39387 Can't build Kotlin project due to overload resolution ambiguity on flatMap calls
KT-39229 NI: resolution to wrong candidate (SAM-type against similar functional type)

Docs & Examples

KT-36245 Document that @kotlin.native.ThreadLocal annotation doesn't work anywhere except in Kotlin/Native
KT-37943 Conflicting overloads in the factory functions sample code in Coding Conventions Page

IDE

New Features

KT-10974 Add Code Style: Import Layout Configuration Table
KT-39065 "Join lines" should remove trailing comma on call site

Fixes

KT-9065 Wrong result when move statement through if block with call with lambda
KT-14757 Move statement up breaks code in function parameter list
KT-14946 Move statement up/down (with Ctrl+Shift+Up/Down) messes with empty lines
KT-15143 Kotlin: Colors&Fonts -> "Enum entry" should use Language Default -> Classes - Static field
KT-17887 Moving statement (Ctrl/Cmd+Shift+Down) messes with use block
KT-34187 UAST cannot get type of array access
KT-34524 "PSI and index do not match" and IDE freeze with library import from square/workflow
KT-35574 UAST: UBreakExpression in when expression should be UYieldExpression
KT-36801 IDE: Unsupported language version value is represented with "latest stable" in GUI
KT-37378 Remove IDE option "Enable new type inference algorithm..." in 1.4
KT-38003 "Analyze Data Flow from Here" should work on parameter of abstract method
KT-38173 Reified types do no have extends information
KT-38217 Make Kotlin plugin settings searchable
KT-38247 "IncorrectOperationException: Incorrect expression" through UltraLightUtils.kt: inlined string is not escaped before parsing
KT-38293 Throwable: "'codestyle.name.kotlin' is not found in java.util.PropertyResourceBundle" at KotlinLanguageCodeStyleSettingsProvider.getConfigurableDisplayName()
KT-38407 Drop components from plugin.xml
KT-38443 No error on change in property initializer
KT-38521 ISE: Loop in parent structure when converting a DOT_QUALIFIED_EXPRESSION with parent ANNOTATED_EXPRESSION
KT-38571 Rework deprecated EPs
KT-38632 Change the code style to official in tests

IDE. Code Style, Formatting

Fixes

KT-24750 Formatter: Minimum blank lines after class header does nothing
KT-31169 IDEA settings search fails to find "Tabs and Indents" tab in Kotlin code style settings
KT-35359 Incorrect indent for multiline expression in string template
KT-37420 Add setting to disable inserting empty line between declaration and declaration with comment
KT-37891 Formatter inserts empty lines between annotated properties
KT-38036 Use trailing comma setting does not apply to code example in Settings dialog
KT-38568 False positive: weak warning "Missing line break" on -> in when expression
KT-39024 Add option for blank lines before declaration with comment or annotation on separate line
KT-39079 Trailing comma: add base support for call site
KT-39123 Option Align 'when' branches in columns does nothing
KT-39180 Move trailing comma settings in Other tab

IDE. Completion

KT-18538 Completion of static members of grand-super java class inserts unnecessary qualifier
KT-38445 Fully qualified class name is used instead after insertion of delay method

IDE. Debugger

Fixes

KT-14057 Debugger couldn't step into Reader.read
KT-14828 Bad step into/over behavior for functions with default parameters
KT-36403 Method breakpoints don't work for libraries
KT-36404 Evaluate: "AssertionError: Argument expression is not saved for a SAM constructor"
KT-37486 Kotlin plugin keeps reference to stream debugger support classes after stream debugger plugin is disabled
KT-38484 Coroutines Debugger: IAE “Requested element count -1 is less than zero.” is thrown by calling dumpCoroutines
KT-38606 Coroutine Debugger: OCE from org.jetbrains.kotlin.idea.debugger.coroutine.proxy.mirror.BaseMirror.isCompatible
KT-39143 NPE on setCurrentStackFrame to Kotlin inner compiled class content
KT-39412 Failed to find Premain-Class manifest attribute when debugging main method with ktor
KT-39634 (CoroutineDebugger) Agent doesn't start if using kotlinx-coroutines-core only dependency
KT-39648 Coroutines debugger doesn't see stacktraces in case of the project has kotlinx-coroutines-debug dependency

IDE. Gradle Integration

Performance Improvements

KT-39059 Poor performance of modifyDependenciesOnMppModules

Fixes

KT-35921 Gradle Import fails with "Unsupported major.minor version 52.0" on pure Java project in case "Gradle JDK" is lower 1.8 and Kotlin plugin is enabled
KT-36673 Gradle Project importing: move ModelBuilders and ModelProviders to kotlin-gradle-tooling jar
KT-36792 IDEA 2020.1: Some module->module dependencies in HMPP project are missed after import from Gradle
KT-37125 Imported modules structure for MPP project is displayed messy in UI in IDEA 2020.1
KT-37428 NPE at KotlinFacetSettings.setLanguageLevel() on the first project import
KT-38706 IDE Gradle import creates 4 JavaScript modules for MPP source sets with BOTH compiler type
KT-38767 Published hierarchical multiplatform library symbols are unresolved in IDE (master)
KT-38842 False positive [INVISIBLE_MEMBER] for internal declaration of commonMain called from commonTest
KT-39213 IDE: references from MPP project to JavaScript library are unresolved, when project and library are compiled with "both" mode
KT-39657 Language settings for intermediate source-sets are lost during import

IDE. Gradle. Script

New Features

KT-34481 *.gradle.kts: use Intellij IDEA Gradle project sync mechanics for updating script configuration

Performance Improvements

KT-34138 Deadlock in ScriptTemplatesFromDependenciesProvider
KT-38875 Deadlock in ScriptClassRootsUpdater.checkInvalidSdks

Fixes

KT-34265 Bogus "build configuration failed, run 'gradle tasks' for more information" message and other issues related to "script dependencies"
KT-34444 *.gradle.kts: special storage of all scripts configuration on one file
KT-35153 build.gradle.kts: scripts in removed subproject remain imported, but shouldn't
KT-35573 Request for gradle build script configuration only after explicit click on notification
KT-36675 move .gradle.kts ModelBuilders and ModelProviders to kotlin-gradle-tooling jar
KT-37178 build.gradle.kts: Rework the notification for scripts out of project
KT-37631 Unnecessary loading dependencies after opening build.gradle.kts after project import with Gradle 6
KT-37863 Scanning dependencies for script definitions takes too long or indefinitely during Gradle import
KT-38296 MISSING_DEPENDENCY_SUPERCLASS in the build.gradle.kts editor while Gradle runs Ok
KT-38541 "Invalid file" exception in ScriptChangeListener.getAnalyzableKtFileForScript()
KT-39104 “Gradle Kotlin DSL script configuration is missing” after importing project in IJ201, Gradle 6.3
KT-39469 Gradle version is not updated in script dependencies if the version of gradle was changed in gradle-wrapper.properties
KT-39771 Freeze 30s from org.jetbrains.kotlin.scripting.resolve.ApiChangeDependencyResolverWrapper.resolve on loading script configuration with Gradle 5.6.4

IDE. Inspections and Intentions

New Features

KT-14884 Intention to add missing "class" keyword for enum and annotation top-level declarations
KT-17209 Provide intention to fix platform declaration clash (CONFLICTING_JVM_DECLARATIONS)
KT-24522 Suggest to move typealias outside the class
KT-30263 Detect redundant conversions of unsigned types
KT-35893 Support Inspection for unnecessary asSequence() call
KT-38559 "Change JVM name" (@JvmName) quickfix: improve name suggester for generic functions
KT-38597 Expand Boolean intention
KT-38982 Add "Logger initialized with foreign class" inspection
KT-39131 TrailingCommaInspection: should suggest fixes for call-site without warnings

Fixes

KT-5271 Missing QuickFix for Multiple supertypes available
KT-11865 "Create secondary constructor" quick fix always inserts parameter-less call to this()
KT-14021 Quickfix to add parameter to function gives strange name to parameter
KT-17121 "Implement members" quick fix is not suggested
KT-17368 Don't highlight members annotated with @JsName as unused
KT-20795 "replace explicit parameter with it" creates invalid code in case of overload ambiguities
KT-22014 Intention "convert lambda to reference" should be available for implicit 'this'
KT-22015 Intention "Convert lambda to reference" should be available in spite of the lambda in or out of parentheses
KT-22142 Intentions: "Convert to primary constructor" changes semantics for property with custom setter
KT-22878 Empty argument list at the call site of custom function named "suspend" shouldn't be reported as unnecessary
KT-24281 Importing of invoke() from the same file is reported as unused even if it isn't
KT-25050 False-positive inspection "Call replaceable with binary operator" for 'equals'
KT-26361 @deprecated "ReplaceWith" quickfix inserts 'this' incorrectly when using function imports
KT-27651 'Condition is always true' inspection should not be triggered when the condition has references to a named constant
KT-29934 False negative Change type quickfix on primary constructor override val parameter when it has wrong type
KT-31682 'Convert lambda to reference' intention inside class with function which return object produces uncompilable code
KT-31760 Implement Abstract Function/Property intentions position generated member improperly
KT-32511 Create class quick fix is not suggested in super type list in case of missing primary constructor
KT-32565 False positive "Variable is the same as 'credentials' and should be inlined" with object declared and returned from lambda
KT-32801 False positive "Call on collection type may be reduced" with mapNotNull, generic lambda block and new inference
KT-33951 ReplaceWith quickfix with unqualified object member call doesn't substitute argument for parameter
KT-34378 "Convert lambda to reference" refactoring does not work for suspend functions
KT-34677 False positive "Collection count can be converted to size" with Iterable
KT-34696 Wrong 'Redundant qualifier name' for 'MyEnum.values' usage
KT-34713 "Condition is always 'false'": quickfix "Delete expression" doesn't remove else keyword (may break control flow)
KT-35015 ReplaceWith doesn't substitute parameters with argument expressions
KT-35329 Replace 'when' with 'if' intention: do not suggest if 'when' is used as expression and it has no 'else' branch
KT-36194 "Add braces to 'for' statement" inserts extra line break and moves the following single-line comment
KT-36406 "To ordinary string literal" intention adds unnecessary escapes to characters in template expression
KT-36461 "Create enum constant" quick fix adds after semicolon, if the last entry has a comma
KT-36462 "Create enum constant" quick fix doesn't add trailing comma
KT-36508 False positive "Replace 'to' with infix form" when 'to' lambda generic type argument is specified explicitly
KT-36930 Intention "Specify type explicitly" adds NotNull annotation when calling java method with the annotation
KT-37148 "Remove redundant .let call doesn't remove extra calls
KT-37156 "Unused unary operator" inspection highlighting is hard to see
KT-37173 "Replace with string templates" intention for String.format produces uncompilable string template
KT-37181 Don't show "Remove redundant qualifier name" inspection on qualified Companion imported with star import
KT-37214 "Convert lambda to reference" with a labeled "this" receiver fails
KT-37256 False positive PlatformExtensionReceiverOfInline inspection if a platform type value is passed to a nullable receiver
KT-37744 "Convert lambda to reference" inspection quick fix create incompilable code when type is inferred from lambda parameter
KT-37746 "Redundant suspend modifier" should not be reported for functions with actual keyword
KT-37842 "Convert to anonymous function" creates broken code with suspend functions
KT-37908 "Convert to anonymous object" quickfix: false negative when interface has concrete functions
KT-37967 Replace 'invoke' with direct call intention adds unnecessary parenthesis
KT-37977 "Replace 'invoke' with direct call" intention: false positive when function is not operator
KT-38062 Reactor Quickfix throws NotImplementedError for Kotlin
KT-38240 False positive redundant semicolon with as cast and not unary operator on next line
KT-38261 Redundant 'let' call removal leaves ?. operator and makes code uncompilable
KT-38310 Remove explicit type annotation intention drops 'suspend'
KT-38492 False positive "Add import" intention for already imported class
KT-38520 SetterBackingFieldAssignmentInspection throws exception
KT-38649 False positive quickfix "Assignment should be lifted out of when" in presence of smartcasts
KT-38677 Invalid psi tree after Lift assigment out of...
KT-38790 "Convert sealed subclass to object" for data classes doesn't remove 'data' keyword
KT-38829 'Remove redundant backticks' can be broken with @ in name
KT-38831 'Replace with assignment' can be broken with fast code change
KT-38832 "Remove curly braces" intention may produce CCE
KT-38948 False positive quickfix "Make containing function suspend" for anonymous function
KT-38961 "Useless call on collection type" for filterNotNull on non-null array where list return type is expected
KT-39069 Improve TrailingCommaInspection
KT-39151 False positive inspection to replace Java forEach with Kotlin forEach when using ConcurrentHashMap

IDE. JS

KT-39275 Kotlin JS Browser template for kotlin dsl doesn't include index.html

IDE. KDoc

KT-32163 Open Quick Documentation when cursor inside function / constructor brackets

IDE. Navigation

KT-32245 Method in Kotlin class is not listed among implementing methods
KT-33510 There is no gutter icon to navigate from actual to expect if expect and the corresponding actual declarations are in the same file
KT-38260 Navigation bar doesn't show directories of files with a single top level Kotlin class
KT-38466 Top level functions/properties aren't shown in navigation panel

IDE. Project View

KT-36444 Structure view: add ability to sort by visibility
KT-38276 Structure view: support visibility filter for class properties

IDE. REPL

KT-38454 Kotlin REPL in IntelliJ doesn't take module's JVM target setting into account

IDE. Refactorings

KT-12878 "Change signature" forces line breaks after every parameter declaration
KT-30128 Change Signature should move lambda outside of parentheses if the arguments are reordered so that the lambda goes last
KT-35338 Move/rename refactorings mess up code formatting by wrapping lines
KT-38449 Extract variable refactoring is broken by NPE
KT-38543 Copy can't work to package with escaped package
KT-38627 Rename package refactorings mess up code formatting by wrapping lines

IDE. Run Configurations

KT-34516 Don't suggest incompatible targets in a drop-down list for run test gutter icon in multiplatform projects
KT-38102 DeprecatedMethodException ConfigurationFactory.getId

IDE. Scratch

KT-38455 Kotlin scratch files don't take module's JVM target setting into account

IDE. Script

KT-39791 Kotlin plugin loads VFS in the output directories

IDE. Structural Search

KT-39721 Optimize Kotlin SSR by using the index
KT-39733 Augmented assignment matching
KT-39769 "When expressions" predefined template doesn't match all when expressions

IDE. Wizards

KT-38673 New Project Wizard: multiplatform templates are generated having unsupported Gradle version in a wrapper
KT-38810 Incorrect order of build phases in Xcode project from new wizard
KT-38952 Remove old new_project_wizards
KT-39503 New Project wizard 1.4+: release kotlinx.html version is added to dependencies with milestone IDE plugin
KT-39700 Wizard: group project templates on the first step by the project type
KT-39770 CSS Support in Kotlin wizards
KT-39826 Fix Android app in New Template Wizard
KT-39843 Change imports in JS/browser wizard

JS. Tools

KT-32273 Kotlin/JS console error on hot reload
KT-39498 Update dukat version in toolchain near to release of 1.4-M3

JavaScript

KT-29916 Implement typeOf on JS
KT-35857 Kotlin/JS CLI bundled to IDEA plugin can't compile using IR back-end out of the box
KT-36798 KJS: prohibit using @JsExport on a non-top-level declaration
KT-37771 KJS: Generated TypeScript does not recursively export base classes (can fail with generics)
KT-38113 Review public API of JS stdlib for IR BE
KT-38765 [JS / IR] AssertionError: class EventEmitter: Super class should be any: with nested class extending parent class
KT-38768 KJS IR: generate ES2015 (aka ES6) classes

Libraries

New Features

KT-11253 Function to sum long or other numeric property of items in a collection
KT-28933 capitalize() with Locale argument in the JDK stdlib
KT-34142 Create SortedMap with Comparator and items
KT-34506 Add Sequence.flatMap overload that works on Iterable
KT-36894 Support flatMapIndexed in the Collections API
KT-38480 Introduce experimental annotation for enabling overload resolution by lambda result
KT-38708 minOf/maxOf functions to return min/max value provided by selector
KT-39707 Make some interfaces in stdlib functional

Performance Improvements

KT-23142 toHashSet is suboptimal for inputs with a lot of duplicates

Fixes

KT-21266 Add module-info for standard library artifacts
KT-23322 Document 'reduce' operation behavior on empty collections
KT-28753 Comparing floating point values in array/list operations 'contains', 'indexOf', 'lastIndexOf': IEEE 754 or total order
KT-30083 Annotate KTypeProjection.STAR with JvmField in a compatible way
KT-30084 Annotate functions in KTypeProjection.Companion with JvmStatic
KT-31343 Deprecate old String <-> CharArray, ByteArray conversion api
KT-34596 Add some validation to KTypeProjection constructor
KT-35978 Review and remove experimental stdlib API status for 1.4
KT-38388 Document fromIndex and toIndex parameters
KT-38854 Gradually change the return type of collection min/max functions to non-nullable
KT-39023 Document split(Pattern) extension differences from Pattern.split
KT-39064 Introduce minOrNull and maxOrNull extension functions on collections
KT-39235 Lift experimental annotation from bit operations
KT-39237 Lift experimental annotation from common StringBuilder
KT-39238 Appendable.appendRange - remove nullability
KT-39239 Lift experimental annotation from String <-> utf8 conversion api
KT-39244 KJS: update polyfills, all or most of them must not be enumerable
KT-39330 Migrate declarations from kotlin.dom and kotlin.browser packages to kotlinx.*

Middle-end. IR

KT-31088 need a way to compute fake overrides for pure IR
KT-33207 Kotlin/Native: KNPE during deserialization of an inner class
KT-33267 Kotlin/Native: Deserialization error for an "inner" extension property imported from a class
KT-37255 Make psi2ir aware of declarations provided by compiler plugins

Reflection

KT-22936 Not all things can be changed to createType yet, and now defaultType methods are starting to fail
KT-32241 Move KType.javaType into stdlib from reflect
KT-34344 KType.javaType implementation throws when invoked with a typeOf()
KT-38491 IllegalArgumentException when using callBy on function with inline class parameters and default arguments
KT-38881 Add KClass.isFun modifier of functional interfaces to reflection

Tools. Android Extensions

KT-25807 Kotlin extension annotation @parcelize in AIDL returns Object instead of original T

Tools. CLI

KT-30211 Support a way to pass arguments to the underlying JVM in kotlinc batch scripts on Windows
KT-30778 kotlin-compiler.jar contains shaded but not relocated kotlinx.coroutines
KT-38070 Compiler option to bypass prerelease metadata incompatibility error
KT-38413 Add JVM target bytecode version 14

Tools. Compiler Plugins

KT-39274 [KJS / IR] Custom serializer for class without zero argument constructor doesn't compile

Tools. Gradle

KT-25428 Kotlin Gradle Plugin: Use new Gradle API for Lazy tasks
KT-34487 Gradle build fails with "Cannot run program "java": error=7, Argument list too long
KT-35957 MPP IC fails with "X has several compatible actual declarations" error
KT-38250 Drop support for Gradle versions older than 5.3 in the Kotlin Gradle plugin

Tools. Gradle. JS

New Features

KT-30619 Support NPM transitive dependencies in multi-platform JS target
KT-38286 [Gradle, JS] Error handling on Webpack problems

Fixes

KT-31669 Gradle/JS: rise error when plugin loaded more than once
KT-32531 [Gradle/JS] Add scoped NPM dependencies
KT-34832 [Kotlin/JS] Failed build after webpack run (Karma not found)
KT-35194 Kotlin/JS: browserRun fails with "address already in use" when trying to connect to local server
KT-35611 Kotlin Gradle plugin should report kotlin2js plugin ID as deprecated
KT-35641 Kotlin Gradle plugin should report kotlin-dce-js plugin ID as deprecated
KT-36410 JS: Collect stats about IR backend usage
KT-36451 KJS Adding npm dependency breaks Webpack devserver reloading
KT-37258 Kotlin/JS + Gradle: in continuous mode kotlinNpmInstall time to time outputs "ENOENT: no such file or directory" error
KT-38109 [Gradle, JS] Error handling on Karma launcher problems
KT-38331 Add an ability to control generating externals for npm deps individually
KT-38485 [Gradle, JS] Unable to configure JS compiler with string
KT-38683 Remove possibility to set NPM dependency without version
KT-38990 Support multiple range versions for NPM dependencies
KT-38994 Remove possibility to set NPM dependency with npm(org, name, version)
KT-39109 ArithmeticException: "/ by zero" caused by kotlinNodeJsSetup task with enabled gradle caching on Windows
KT-39210 Kotlin/JS: with both JS and MPP modules in the same project Gradle configuration fails on nodejs {} and browser {}
KT-39377 Use standard source-map-loader instead of custom one

Tools. Gradle. Multiplatform

KT-39184 Support publication of Kotlin-distributed libraries with Gradle Metadata
KT-39304 Gradle import error java.util.NoSuchElementException: Key source set foo is missing in the map on unused source set

Tools. Gradle. Native

KT-37514 CocoaPods Gradle plugin: Support building from terminal projects for several platforms
KT-38440 Make error message about missing Podfile path for cocoapods integration actionable for a user
KT-38991 Gradle MPP plugin: Enable parallel in-process execution for K/N compiler
KT-39935 Support overriding the KotlinNativeCompile task sources
KT-37512 Cocoapods Gradle plugin: Improve error logging for external tools

Tools. J2K

KT-35169 Do not show "Inline local variable" popup during "Cleaning up code" phase of J2K
KT-38004 J2K breaks java getter call in java code
KT-38450 J2K should convert Java SAM interfaces to Kotlin fun interfaces

Tools. JPS

KT-27458 The Kotlin standard library is not found in the module graph ... in a non-Kotlin project.
KT-29552 Project is completely rebuilt after each gradle sync.

Tools. Scripts

KT-37766 Impossible to apply compiler plugins onto scripts with the new scripting API

Tools. kapt

KT-29355 Provide access to default values for primary constructor properties

1.4-M2

Compiler

New Features

KT-37432 Do not include annotations fields into 'visibility must be explicitly specified' check in api mode

Performance Improvements

KT-27362 Anonymous classes representing function/property references contain rarely used methods
KT-35626 NI: Performance problem with many type parameters
KT-36047 Compiler produces if-chain instead of switch when when subject captured as variable
KT-36638 Use 'java/lang/StringBuilder.append (C)Ljava/lang/StringBuilder;' when appending single character in JVM_IR
KT-37389 Avoid type approximation during generation constraints with EQUALITY kind
KT-37392 Avoid substitution and type approximation for simple calls
KT-37546 NI: high memory and CPU consumption due to creating useless captured types (storing in approximated types cache, unneeded computations)

Fixes

KT-11265 Factory pattern and overload resolution ambiguity
KT-27524 Inline class is boxed when used with suspend modifier
KT-27586 ClassCastException occurs if the Result (or any other inline class) is returned from a lambda
KT-30419 Use boxed version of an inline class in return type position for covariant and generic-specialized overrides
KT-31163 FIR: consider replacing comparisons with compareTo calls and some additional intrinsics
KT-31585 ClassCastException with derived class delegated to generic class with inline class type argument
KT-31823 NI: Type mismatch with a star projection and UnsafeVariance
KT-33119 Pre-increment for inline class wrapping Int compiles to direct increment instead of inc-impl
KT-33715 Kotlin/Native: metadata compiler
KT-34048 IllegalAccessError when initializing val property in EXACTLY_ONCE lambda
KT-34433 NI: Type mismatch with a star projection and UnsafeVariance
KT-35133 FIR Java: don't set 'isOperator' for methods with non-operator names
KT-35234 ClassCastException with creating an inline class from a function reference of covariant or generic-specialized override
KT-35406 Generic type implicitly inferred as Nothing with no warning
KT-35587 Plain namespace strings in JvmNameResolver.PREDEFINED_STRINGS are prone to namespace changes during jar relocation.
KT-36044 NI: premature fixation a type variable if there were nested lambdas (constraint source was the deepest lambda)
KT-36057 [FIR] Incorrect smartcast
KT-36069 NI: TYPE_MISMATCH caused by incorrect inference to Nothing
KT-36125 Callable reference resolution ambiguity error is not displayed properly in the IDE
KT-36191 IDE locks loading packages and editing file containing try keyword inside string template
KT-36222 NI: Improve error message about nullability mismatch for a generic call
KT-36249 NI doesn't use upper bound for T of called function during infer return type and as a result infer it to Any? if the resulting type was intersection type
KT-36345 FIR: record argument mapping for use in back-end
KT-36446 NI: "UnsupportedOperationException no descriptor for type constructor of IntegerLiteralType[Int,Long,Byte,Short]" with BuilderInference and delegate
KT-36758 [FIR] Unresolved callable reference to member of local class
KT-36759 [FIR] Unsupported callable reference resolution for methods with default parameters
KT-36762 [FIR] Unresolved array.clone()
KT-36764 [FIR] Bug in inference with DefinitelyNotNull types
KT-36816 NI: definitely not-null (T!!) types in invariant positions don't approximate to T inside inference process
KT-36819 NI: premature completion of lambdas, which are passed somewhere
KT-36850 Incorrect private visibility of sealed class constructors
KT-36856 Throwing exception when there is inheritance in Kotlin from Java class, which contains methods with the same JVM descriptors
KT-36879 Introduce FIR_IDENTICAL in diagnostic tests
KT-36881 FIR: completion don't runs for return expressions
KT-36887 [FIR] Unresolved member in nested lambda in initializer
KT-36905 [FIR] Unresolved in lambda in default argument position
KT-36953 AssertionError: "Unsigned type expected: null" when there is a range with an unsigned type
KT-37009 FIR: Bound smart-cast lost
KT-37027 FIR: Wrong projection on spread + varargs on non-final types
KT-37038 NI: redundant lambda's arrow breaks CST calculation for extension lambdas
KT-37043 NI: inference T to Any? if there was elvis between Java out-type and reified materialize for this type without out projection
KT-37066 [FIR] Wrong type inference for lambdas
KT-37070 [FIR] Unresolved parameters of outer lambda in scope of inner lambda
KT-37087 "IllegalStateException: Can't find method 'invoke()'" for mutable property reference in default value of an inline function parameter
KT-37091 [FIR] Wrong inferred type of when-expression if when-argument is not-null-asserted and type is not specifies explicitly
KT-37176 [FIR] Incorrect resolution mode for statements of block
KT-37302 Unexpected conversion:Int constant inferred to Long in when expression
KT-37327 FIR: Smartcast problem
KT-37343 NI: definitely not null types pre-approximation is inconsistent with OI
KT-37380 NI: broken some code with def not null types due to skip needed constraints
KT-37419 NI: UNRESOLVED_REFERENCE_WRONG_RECEIVER is reported in case lambda with receiver is returned from when expression
KT-37434 Kotlin/JS, Kotlin/Native: fun interfaces: SAM conversion to Kotlin interface is not compiled with RESOLUTION_TO_CLASSIFIER
KT-37447 Expression from annotation entry in value parameter inside value parameter should be marked as USED_AS_EXPRESSION
KT-37453 Type arguments not checked to be empty for candidates with no declared parameters
KT-37488 [FIR] Incorrect exhaustiveness checking for branches with equals to object that implements sealed class
KT-37497 NI: 'super' is not an expression, it can not be used as a receiver for extension functions
KT-37530 NI: instantiation of abstract class via callable reference argument causes run time InstantiationError
KT-37531 NI: callable reference argument with left hand side type parameter causes frontend exception
KT-37554 NI: Nothing is inferred incorrectly with elvis return
KT-37579 NI: inconsistent behaviour with OI around implicit invoke convention after safe call with additional implicit receiver
KT-37604 "VerifyError: Call to wrong method" in 'invoke' for adapted callable reference to constructor with coercion to Unit
KT-37621 NI: type variable is inferred to Nothing if the second branch was Nothing and there was upper bound for a type parameter
KT-37626 NI: builder inference with expected type breaks class references resolution for a class with parameters
KT-37627 NI: wrong order of the type variable fixation (Nothing? against a call with lambda)
KT-37628 NI: wrong approximation of type argument to star projection during common super type calculation
KT-37644 NI: appeared exception during incorporation of a captured type into a type variable for elvis resolve
KT-37650 NI: it's impossible to infer a type variable with the participation of a wrapped covariant type
KT-37718 False positive unused parameter for @JvmStatic main function in object
KT-37779 ClassCastException: Named argument without spread operator for vararg parameter causes code to crash on runtime
KT-37832 In MPP, subtypes of types defined in legacy libraries, like stdlib, cannot properly resolve on the consumer side receviing both
KT-37861 Capturing an outer class instance in a default parameter of inner class constructor causes VerifyError
KT-37986 Return value of function reference returning inline class mapped to 'java.lang.Object' is not boxed properly
KT-37998 '!!' operator on safe call of function returning inline class value causes CCE at runtime
KT-38042 Allow kotlin.Result as a return type only if one enabled inline classes explicitly
KT-38134 NI: Type mismatch with a star projection and UnsafeVariance
KT-38298 Inconsistent choice of candidate when both expect/actual are available (affects only enableGranularSourceSetMetadata)
KT-38661 NI: "Cannot infer type variable TypeVariable" with lambda with receiver
KT-38668 Project with module dependency in KN, build fails with Kotlin 1.3.71 and associated libs but passes with 1.3.61.
KT-38857 Class versions V1_5 or less must use F_NEW frames.
KT-39113 "AssertionError: Uninitialized value on stack" with EXACTLY_ONCE contract in non-inline function and lambda destructuring

Docs & Examples

KT-35231 toMutableList documentation is vague

IDE

Performance Improvements

KT-30541 EDT Freeze after new Kotlin Script creation
KT-35050 Significant freezes due to findSdkAcrossDependencies()
KT-37301 Freeze when "Optimize Imports" in KotlinImportOptimizer
KT-37466 Invalidate partialBodyResolveCache on OCB
KT-37467 PerFileAnalysisCache.fetchAnalysisResults
KT-37993 Do not resolve references if paste code is located in the same origin
KT-38318 Freezes in IDEA

Fixes

KT-27935 Functional typealias with typealias in type parameters causes UnsupportedOperationException in TypeSignatureMappingKt (IDEA analysis)
KT-31668 Complete statement for class declaration: add '()' to supertype
KT-33473 UAST: References to local variable are resolved to UastKotlinPsiVariable
KT-34564 Kotlin USimpleNameReferenceExpression for annotation parameter resolves to null for compiled Kotlin classes
KT-34973 Light class incorrectly claiming ambiguous method call from Java when one overload is synthetic
KT-35801 UAST: UnknownKotlinExpression for valid Kotlin annotated expression
KT-35804 UAST: Annotations missing from catch clause parameters
KT-35848 UAST: ClassCastException when trying to invoke UElement for some wrapped PsiElements
KT-36156 Kotlin annotation attributes have blue color whereas white in Java
KT-36275 UAST: UCallExpression::resolve returns null for local function calls
KT-36717 Fix failing light class tests after switching plugin to language version 1.4
KT-36877 Message bundles for copy paste are missed in 201
KT-36907 IDE: -Xuse-ir setting on facet level does not affect highlighting
KT-37133 UAST: Annotating assignment expression sometimes leads to UnknownKotlinExpression
KT-37312 "Implement members" intention put function in the primary constructor if there are unused brackets in class
KT-37613 Uast: no parameters in reified method
KT-37933 Rare NPE in ProjectRootsUtilKt.isKotlinBinary [easy fix]
KT-38081 Configure kotlin in project produces IDE error "heavy operation and should not be call on AWT thread"
KT-38354 HMPP. IDE. Dependency leakage from leaf native to shared native module
KT-38634 IDE: Error on opening MPP project in 1.3.72 after opening it in 1.4-M2

IDE. Code Style, Formatting

KT-37870 "Remove trailing comma" action stops working after applying and cancelling it

IDE. Completion

KT-36808 Delete Flow.collect from autocompletion list or make it least prioritized
KT-36860 Provide convenient completion of extension functions from objects
KT-37395 Invalid callable reference completion of member extension

IDE. Debugger

KT-34906 Implement Coroutine Debugger
KT-35392 Debugger omits meaningful part of the stacktrace even with disabled filter
KT-36215 Coroutines debugger tab is empty in Android Studio
KT-37238 Coroutines Debugger: dump creation fails every time
KT-38047 Coroutines Debugger: Assertion failed: “Should be invoked in manager thread, use DebuggerManagerThreadImpl” on moving to source code from suspended coroutine in project without debugger jar in classpath
KT-38049 Coroutines Debugger: NPE “null cannot be cast to non-null type com.sun.jdi.ObjectReference” is thrown by calling dumpCoroutines
KT-38487 Any Field Watch interaction causes a MissingResourceException

IDE. Decompiler, Indexing, Stubs

KT-37896 IAE: "Argument for @NotNull parameter 'file' of IndexTodoCacheManagerImpl.getTodoCount must not be null" through KotlinTodoSearcher.processQuery()

IDE. Gradle Integration

KT-33809 With kotlin.mpp.enableGranularSourceSetsMetadata=true, IDE misses dependsOn-relation between kotlin and android sourceSets, leading to issues with expect/actual matching
KT-36354 IDE: Gradle import from non-JVM projects: dependency to output artifact is created instead of module dependency
KT-38037 UnsupportedOperationException on sync gradle Kotlin project with at least two multiplatform modules

IDE. Gradle. Script

KT-36763 Drop modification stamp for scripts after project import
KT-37237 Script configurations should be loaded during project import in case of errors
KT-38041 Do not request for script configuration after VCS update

IDE. Inspections and Intentions

New Features

KT-3262 Inspection "Inner class could be nested"
KT-15723 Add 'Convert to value' quickfix for property containing only getter
KT-34026 Add "Remove argument" quick fix for redundant argument in constructor call
KT-34332 Add "Remove argument" quick fix for redundant argument in function call
KT-34450 Convert function to property intention should be also displayed on fun keyword
KT-34593 Invert 'if' condition: Invert String.isNotEmpty should be String.isEmpty
KT-34819 Inspection: report useless elvis "?: return null"
KT-37849 Support ReplaceWith for supertypes call

Performance Improvements

KT-37515 Deadlock

Fixes

KT-12329 "invert if" inserts unnecessary 'continue' for statement inside a loop with 'continue'
KT-17615 "Convert parameter to receiver" changes this to this@ < no name provided >
KT-20868 IntelliJ says method from anonymous inner class with inferred interface type is not used even though it is
KT-20907 Secondary constructor is marked as unused by IDE when called by typealias
KT-22368 "Convert to block body" intention incorrectly formats closing brace
KT-23510 "Remove parameter" quick fix keeps lambda argument when it's out of parentheses
KT-27601 False positive "Unused import directive" for extension function used in KDoc
KT-28085 "Convert receiver to parameter" introduces incorrect this@class in lambda
KT-30028 "Convert parameter to receiver" introduces wrong 'this' qualifier for extension lambda receiver
KT-31601 "Remove redundant let call" changes semantics by introducing multiple safe calls
KT-31800 False positive "never used" with function in private val object expression
KT-31912 QF “Convert to anonymous object” do nothing on SAM-interfaces
KT-32561 "Property can be declared in constructor" causes another warning
KT-32809 Convert parameter to receiver inserts wrong qualifiers for this (when nothing needs to be changed)
KT-34371 "Surround with lambda" quickfix is not available for suspend lambda parameters.
KT-34640 Replace 'if' with 'when' leads to copy comment line above when from another if
KT-36225 KNPE: CodeInliner.processTypeParameterUsages with ReplaceWith for inline reified generic function
KT-36266 NPE when invoking Lift return out of if/when after intention becomes inapplicable but still beeing shown
KT-36296 False negative "Redundant SAM-constructor" with multiple SAM arguments
KT-36367 False negative "Redundant SAM-constructor" for kotlin functions
KT-36368 False negative "Redundant SAM-constructor" for fun interfaces in kotlin
KT-36395 False positive "Redundant SAM-constructor" with two java interfaces extending one another
KT-36411 "Put parameters on separate lines" and "Put parameters on one line" actions do not respect trailing comma
KT-36482 "Add JvmOverloads annotation" intention is still suggested for annotation's parameters
KT-36686 Implement members quickfix puts the implementation before the data class if it already has a body
KT-36685 "Convert to a range check" transform hex range to int if it is compared with "Less" or "Greater"
KT-36707 False positive redundant companion object on calling companion object members
KT-36735 Inspection 'Replace 'toString' with string template' miss curly braces and generates wrong code for constructor calls
KT-36834 Convert use-site targets and usages with convert property to fun intention
KT-37213 "Move to top level" intention does not update imports for extension functions
KT-37496 False positive "Remove redundant backticks" for multiple underscores variable name
KT-37502 False positive "redundant lambda arrow" with inline generic function with reified type in object and anonymous parameter name
KT-37508 "Convert receiver to parameter" breaks code in anonymous objects (this@ < no name provided >)
KT-37576 Kotlin InspectionSuppressor not being called for the kotlin's inspections
KT-37749 "Convert to anonymous object" intention is suggested for Java SAM conversion, but not for Kotlin
KT-37781 "Add modifier" intention/quickfix works incorrectly with functional interfaces
KT-37893 i18n: Incorrect quickfix name "Lift return out of '"

IDE. KDoc

KT-37361 Support for showing rendered doc comments in editor

IDE. Libraries

KT-36276 IDE: references to declarations in JavaScript KLib dependency are unresolved
KT-37562 IDE: references to JavaScript KLib dependency are unresolved, when project and library are compiled with "both" mode

IDE. Navigation

KT-18472 UI lockup on find usages
KT-18619 Find Usages of element used via import alias does not show actual usage location
KT-34088 Navigate | Implementations action doesn't show implementations of Java methods in Kotlin files if method has parameters referring to generic type
KT-35006 IDE: "Navigate to inline function call site" from stack trace for nested inline call navigates to outer inline call
KT-36138 628 second freeze when doing Find Usages on data class property
KT-36218 Show Kotlin file members in navigation bar
KT-37494 AnnotatedElementsSearch unable to find annotated property accessor

IDE. Project View

KT-32886 Project tool window: Show Visibility Icons does nothing for Kotlin classes
KT-37632 IDE error on project structure opening

IDE. Refactorings

Performance Improvements

KT-37801 Renaming private property with common name is very slow

Fixes

KT-22733 Refactor / Inline Function: fun with type parameter: KNPE at CodeInliner.processTypeParameterUsages()
KT-27389 MPP: Refactoring "Move Class" does not change the package declaration
KT-29870 Inline variable doesn't handle 'when' subject val correctly
KT-33045 Cover Move Refactoring by statistics (FUS)
KT-36071 Refactoring: Move top declaration implementation refactoring
KT-36072 Empty files are removed on Refactor/Move action with turned off "Delete empty source files" option
KT-36114 java.lang.NoClassDefFoundError exception on Refactor/Move of kotlin function if it is referenced in java
KT-36129 java.lang.Throwable: Invalid file exception occurs on Refactor/Move of class from kotlin script
KT-36382 Move file refactoring breaks ktor application config
KT-36504 "Extract property" suggests potentially invalid name for new property
KT-37637 KotlinChangeSignatureUsageProcessor broke Change Signature in Python plugin
KT-37797 Useless "Value for new paramater" step in 'Update usages to reflect signature changes' for method with default parameter value
KT-37822 Improve message "Inline all references and remove the kind"
KT-38348 UL methods return signature without generic type parameters
KT-38527 Move nested class to upper level fails silently: MissingResourceException

IDE. Script

KT-37765 NCDFE KJvmCompiledModuleInMemory on running *.main.kts script

IDE. Tests Support

KT-36716 With kotlin.gradle.testing.enabled=true, gradle console output gets extra ijLog messages
KT-36910 There are no Run/Debug actions in context menu for non-JVM platform-specific test results
KT-37037 [JS, Debug] Node.JS test debug doesn't stop on breakpoints

IDE. Wizards

New Features

KT-36150 New Project Wizard: provide a way to connect with "dependsOn" relation the added project modules
KT-36179 New Project Wizard: it's impossible to make a JVM target friendly to Java code in a multiplatform project

Fixes

KT-35583 New Project wizard: don't suggest build systems which cannot be used
KT-35585 New Project wizard: remember choices which have sense for many projects
KT-35691 New Project wizard: artifact and group values are effectively ignored
KT-35693 New Project wizard creates pom.xml / build.gradle referring to release Kotlin version only
KT-36136 New Project Wizard: generated projects are missing m2 Gradle repository
KT-36137 New Project Wizard: "multiplatform" shall be written as a single word, without the capital P in the middle
KT-36155 New Project Wizard: show warning "Multiplatform project cannot be generated" only for MPP projects
KT-36162 New Project Wizard: make the error messages in modules editor actionable
KT-36163 New Project Wizard: remove trailing spaces in Android SDK Path automatically
KT-36166 New Project Wizard: addition of Android target into a multiplatform project doesn't add a necessary minimal Android configuration
KT-36169 New Project Wizard: Android-related projects failed to build
KT-36176 New Project Wizard: module templates doesn't work for multiplatform projects
KT-36177 New Project Wizard: it's impossible to add more than one target of JVM kind to a multiplatform project
KT-36180 New Project Wizard: it's impossible to set target JVM version for a JVM module
KT-36226 New Project Wizard: add Mobile Android/iOS project template
KT-36267 New Project Wizard: flatten JVM targets list for multiplatform projects
KT-36328 New Project wizard fails for certain templates with AE: "Wrong line separators" at KotlinFormattingModelBuilder.createModel()
KT-37599 New Project Wizard: Open Kotlin Wizard via hyperlink
KT-37667 New project wizard: implement new UI design
KT-37674 Kotlin version in build files includes the IDEA version
KT-38061 New Project wizard 1.4: do not allow choosing build system if corresponding IJ plugin is disabled
KT-38567 New Project wizard 1.4+: Improve processing case when project with required path already exists
KT-38579 New Project wizard 1.4+: multiplatform mobile application: build fails on lint task: Configuration with name 'compileClasspath' not found
KT-38929 New project wizard: update libraries in project template according to kotlin IDE plugin version
KT-38417 Enable new project wizard by-default

JS. Tools

KT-36484 KotlinJS, MPP: Compilation throws "TypeError: b is not a function" only in production mode

JavaScript

KT-31126 Invalid JS constructor call (primary ordinary -> secondary external)
KT-35966 Make @JsExport annotation usable in common code
KT-37128 KJS: StackOverflowException when using reified recursive bound for type parameter
KT-37163 KJS: NullPointerException on using intersection type as a reified one
KT-37418 Support AssociatedObjectKey and findAssociatedObject in JS IR BE

Libraries

New Features

KT-8658 Add property delegates which call get/set on the given KProperty instance, e.g. a property reference
KT-12448 Make @Suppress applicable for type parameters
KT-22932 String.format should support null locale
KT-23514 assertFailsWith should link unexpected exception as cause
KT-23737 JS & MPP: Support exception cause and addSuppressed
KT-25651 Add shuffle() to Array, ByteArray, IntArray, etc to match MutableList
KT-26494 Create an interface with provideDelegate()
KT-27729 Inherit ReadWriteProperty from ReadOnlyProperty
KT-28290 Add the onEach extension function to the Array
KT-29182 SIZE_BYTES/BITS for Float and Double
KT-30372 Add associateWith to Array
KT-33906 Add vararg overloads for maxOf/minOf functions
KT-34161 Array.contentEquals/contentHashCode/contentToString should allow null array receiver and argument
KT-35851 Add setOfNotNull function
KT-36866 reduceIndexedOrNull
KT-36955 stdlib: Reverse range and sortDescending range
KT-37161 Add #onEachIndexed similar to #forEachIndexed
KT-37603 Throwable.stackTraceToString: string with detailed information about exception
KT-37751 Implement shuffled() method Sequences
KT-37804 Add 'fail' in kotlin-test that allows to specify cause
KT-37839 StringBuilder.appendLine in stdlib-common
KT-37910 Support Media Source Extension (MSE) and Encrypted Media Extensions (EME) in Kotlin/Js
KT-38044 Common Throwable.printStackTrace

Performance Improvements

KT-37416 readLine() is very slow

Fixes

KT-13887 Double/Float companion values such as NaN should be constants
KT-14119 String.toBoolean() should be String?.toBoolean()
KT-16529 Names of KProperty's type parameters are inconsistent with ReadOnlyProperty/ReadWriteProperty
KT-36356 Specify which element Iterable.distinctBy(selector) retains
KT-38060 runningFold and runningReduce instead of scanReduce

Reflection

KT-29969 Support optional vararg parameter in KCallable.callBy
KT-37707 "IllegalStateException: superInterface.classLoader must not be null" on class, which implements "AutoCloaseable" interface, "isAccessible" property changing

Tools. CLI

KT-37090 file does not exist: C:\Users\NK\DOWNLO~1\kotlin-compiler-1.3.61\kotlinc\bin\..\lib\kotlin-compiler.jar" from standalone compiler on Windows

Tools. Gradle

KT-35447 Warnings should be piped to stderr when using allWarningsAsErrors = true
KT-35942 User test Gradle source set code cannot reach out internal members from the production code
KT-36019 Implement Gradle DSL for explicit API mode

Tools. Gradle. JS

New Features

KT-32017 Kotlin/JS in MPP: support changing the generated JS file name in Gradle DSL
KT-32721 [Gradle, JS] CSS Support for browser
KT-36843 [Gradle, JS, IR] Configure JS Compiler Type through DSL
KT-37207 Allow to use npm dependency from a local directory
KT-38056 [Gradle, JS] Group tasks by browser and node

Fixes

KT-32466 kotlinNpmResolve fails in the case of composite build
KT-34468 Consider custom versions while parsing yarn.lock
KT-36489 [Gradle, JS, IR]: Correct naming for both compilers
KT-36784 Kotlin. JS. MPP – Cannot find project :js when using Gradle composite builds
KT-36864 KJS. Composite build require JS plugin in root project
KT-37240 KJS. Nondeterministic execution order for webpack scripts (from folder 'webpack.config.d')
KT-37582 Kotlin/JS: KotlinWebpack non-nullable properties are shown as nullable in Gradle configuration
KT-37587 KJS. Karma ignore dynamically created webpack patches
KT-37635 [Gradle, JS] Webpack devtool provide enum for only 2 variants
KT-37636 [Gradle, JS] Extract package.json from klib
KT-37762 [Gradle, JS] Actualize Node and Yarn versions in 1.4
KT-37988 [Gradle, JS] Bump NPM versions on 1.4-M2
KT-38051 [Gradle, JS] browserDistribution doesn't provide outputs
KT-38519 JS Compiler per project without additional import

Tools. Gradle. Multiplatform

KT-36674 allMetadataJar task fails if there is an empty intermediate source set in a multiplatform project with native targets
KT-38746 In HMPP, compilation of a shared-native source set could be mistakenly disabled
KT-39094 Provide a way to pass custom JVM args to commonizer from Gradle

Tools. Gradle. Native

KT-25887 Kotlin Native gradle build fail with endorsed is not supported. Endorsed standards and standalone APIs on jdk > 8 & CLion
KT-36721 Deduce a fully qualified unique_name in klib manifest from something like group name
KT-37730 Native part of multiplatform build fails with "unresolved reference" errors if there is a local and external module with the same name
KT-38174 Kotlin/Native: Disable platform libraries generation at the user side by default

Tools. J2K

Fixes

KT-34965 Convert function reference copied from function call
KT-35593 New J2K: method's names don't change between functions declared in Number.java and Number.kt
KT-35897 J2K converts private enum constructors to internal constructors and produces NON_PRIVATE_CONSTRUCTOR_IN_ENUM error
KT-36088 J2K: StackOverflowError when trying to convert Java class with recursive type bound
KT-36149 J2K: PsiInvalidElementAccessException: Element class com.intellij.psi.impl.source.tree.CompositeElement of type DOT_QUALIFIED_EXPRESSION
KT-36152 J2K: RuntimeException: Couldn't get containingKtFile for ktElement
KT-36159 J2K: ClassCastException if constructor contains a super() call and class extends from Kotlin class
KT-36190 J2K: Wrong property name generation when getter for non-boolean value starts with 'is'
KT-36891 j2k: Fail with java.lang.NoClassDefFoundError when converting array
KT-37052 new J2K: Java private function is converted to private open top-level function
KT-37620 new J2K: IndexOutOfBoundsException (DefaultArgumentsConversion.applyToElement) with overloaded function with vararg parameter
KT-37919 new J2K: Redundant line feeds when converting function

Tools. JPS

KT-37159 A Typo (forgotten space) in build output in Circular dependencies warning description

Tools. Scripts

KT-30086 ThreadDeath when running kotlin scripts using jsr223
KT-37558 Scripts: implicit receivers don't work correctly when using CompiledScriptJarsCache
KT-37823 Consecutive invocations of main.kts throw a KotlinReflectionNotSupportedError

1.4-M1

Compiler

New Features

KT-4240 Type inference possible improvements: analyze lambda with expected type from the outer call
KT-7304 Smart-casts and generic calls with multiple bounds on type parameters
KT-7745 Support named arguments in their own position even if the result appears as mixed
KT-7770 SAM for Kotlin classes
KT-8834 Support function references with default values as other function types
KT-10930 Expected type isn't taken into account for delegated properties
KT-11723 Support coercion to Unit in callable reference resolution
KT-14416 Support of @PolymorphicSignature in Kotlin compiler
KT-16873 Support COERSION_TO_UNIT for suspend lambdas
KT-17643 Inferring type of Pair based on known Map type
KT-19869 Support function references to functions with vararg if expected type ends with repeated vararg element type
KT-21178 Prohibit access of protected members inside public inline members
KT-21368 Improve type inference
KT-25866 Iterable.forEach does not accept functions that return non-Unit values
KT-26165 Support VarHandle in JVM codegen
KT-27582 Allow contracts on final non-override members
KT-28298 Allow references to generic (reified) type parameters in contracts
KT-31230 Refine rules for allowed Array-based class literals on different platforms: allow Array::class everywhere, disallow Array<...>::class on non-JVM
KT-31244 Choose Java field during overload resolution with a pure Kotlin property
KT-31734 Empty parameter list required on Annotations of function types
KT-33990 Type argument isn't checked during resolution part
KT-33413 Allow 'break' and 'continue' in 'when' statement to point to innermost surrounding loop
KT-34743 Support trailing comma in the compiler
KT-34847 Lift restrictions from kotlin.Result

Fixes

KT-2869 Incorrect resolve with 'unsafe call error' and generics
KT-3630 Extension property (generic function type) does not work
KT-3668 Infer type parameters for extension 'get' in delegated property
KT-3850 Receiver check fails when type parameter has another parameter as a bound
KT-3884 Generic candidate with contradiction is preferred over matching global function
KT-4625 Poor error highlighting when assigning not matched type to index operator
KT-5449 Wrong resolve when functions differ only in the nullability of generic type
KT-5606 "Type mismatch" in Java constructor call with SAM lambda and vararg parameter
KT-6005 Type inference problem in sam constructors
KT-6591 Overloaded generic extension function call with null argument resolved incorrectly
KT-6812 Type inference fails when passing a null instead of a generic type
KT-7298 Bogus type inference error in generic method call translated from Java
KT-7301 Type inference error in Kotlin code translated from Java
KT-7333 Type inference fails with star-projections in code translated from Java
KT-7363 Kotlin code with star-projections translated from Java does not typecheck
KT-7378 3-dimension array type inference fail
KT-7410 Call resolution error appears only after adding non-applicable overload
KT-7420 Type inference sometimes infers less specific type than in Java
KT-7758 Type of lambda can't be infered
KT-8218 Wrong 'equals' for generic types with platform type and error type
KT-8265 Non-typesafe program is compiled without errors
KT-8637 Useless diagnostics for type parameters with unsafe nullability
KT-8966 Smart casts don't work with implicit receiver and extension on type parameter with bounds
KT-10265 Type inference problem when using sealed class and interfaces
KT-10364 Call completeCall on variable before invoke resolution
KT-10612 java.util.Comparator.comparing type inference
KT-10628 Wrong type mismatch with star projection of inner class inside use-site projected type
KT-10662 Smartcast with not-null assertion
KT-10681 Explicit type arguments not taken into account when determining applicable overloads of a generic function
KT-10755 Not "least" common super-type is selected for nested 'if' result in presence of multiple inheritance
KT-10929 Type inference based on receiver type doesn't work for delegated properties in some cases
KT-10962 Wrong resolution when argument has unstable DataFlowValue
KT-11108 RxJava failed platform type inference
KT-11137 Java synthetic property does not function for a type with projection
KT-11144 UninferredParameterTypeConstructor exception during build
KT-11184 Type inference failed for combination of safe-call, elvis, HashSet and emptySet
KT-11218 Type inference incorrectly infers nullable type for t...

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