Compiler

New Features

• KT-22703 Allow expect/actual annotation constructors to have default values
• KT-19159 Support crossinline lambda parameters of suspend function type
• KT-21913 Support default arguments for expected declarations
• KT-19120 Provide extra compiler arguments in ScriptTemplateDefinition
• KT-19415 Introduce [@JvmDefault](https://github.com/JvmDefault) annotation
• KT-21515 Restrict visibility of classifiers inside companion objects

Performance Improvements

• KT-10057 Use lcmp instruction instead of kotlin/jvm/internal/Intrinsics.compare
• KT-14258 Suboptimal codegen for private fieldaccess to private field in companion object
• KT-18731 == between enums should use reference equality, not Intrinsics.areEqual().
• KT-22714 Unnecessary checkcast to array of object from an array of specific type
• KT-5177 Optimize code generation for for loop with withIndex()
• KT-19477 Allow to implement several common modules with a single platform module
• KT-21347 Add compiler warning about using kotlin-stdlib-jre7 or kotlin-stdlib-jre8 artifacts

Fixes

• KT-16424 Broken bytecode for nullable generic methods
• KT-17171 ClassCaseException in case of SAM conversion with out variance
• KT-19399 Incorrect bytecode generated for inline functions in some complex cases
• KT-21696 Incorrect warning for use-site target on extension function
• KT-22031 Non-abstract expect classes should not have abstract members
• KT-22260 Never flag inline suspend fun with NOTHING_TO_INLINE
• KT-22352 Expect/actual checker can't handle properties and functions with the same name
• KT-22652 Interface with default overrides is not perceived as a SAM
• KT-22904 Incorrect bytecode generated for withIndex iteration on Array<Int>
• KT-22906 Invalid class name generated for lambda created from method reference in anonymous object
• KT-23044 Overriden public property with internal setter cannot be found in runtime
• KT-23104 Incorrect code generated for LHS of an intrinsified in operator in case of generic type substituted with Character
• KT-23309 Minor spelling errors in JVM internal error messages
• KT-22001 JS: compiler crashes on += with "complex" receiver
• KT-23239 JS: Default arguments for non-final member function support is missing for MPP
• KT-17091 Converting to SAM Java type appends non-deterministic hash to class name
• KT-21521 Compilation exception when trying to compile a suspend function with tailrec keyword
• KT-21605 Cross-inlined coroutine with captured outer receiver creates unverifiable code
• KT-21864 Expect-actual matcher doesn't consider generic upper bounds
• KT-21906 ACTUAL_MISSING is reported for actual constructor of non-actual class
• KT-21939 Improve ACTUAL_MISSING diagnostics message
• KT-22513 Flaky "JarURLConnection.getUseCaches" NPE during compilation when using compiler plugins

Libraries

• KT-11208 readLine() shouldn't use buffered reader

IDE

New Features

• KT-10368 Run Action for Kotlin Scratch Files
• KT-16892 Shortcut to navigate between header and impl
• KT-23005 Support prefix/suffix attributes for language injection in Kotlin with annotations and comments

Performance Improvements

• KT-19484 KotlinBinaryClassCache retains a lot of memory
• KT-23183 ConfigureKotlinNotification.getNotificationString() scans modules with Kotlin files twice
• KT-23380 Improve IDE performance when working with Spring projects

Fixes

• KT-15482 KotlinNullPointerException in IDE from expected class with nested class
• KT-15739 Internal visibility across common and platform-dependent modules
• KT-19025 Not imported build.gradle.kts is all red
• KT-19165 IntelliJ should suggest to reload Gradle projects when build.gradle.kts changes
• KT-20282 'Move statement up' works incorrectly for statement after finally block if try block contains closure
• KT-20521 Kotlin Gradle script: valid build.gradle.kts is red and becomes normal only after reopening the project
• KT-20592 KotlinNullPointerException: nested class inside expect / actual interface
• KT-21013 "Move statement up/down" fails for multiline declarations
• KT-21420 .gradle.kts editor should do no semantic highlighting until the first successful dependency resolver response
• KT-21683 Language injection: JPAQL. Injection should be present for "query" parameter of [@NamedNativeQueries](https://github.com/NamedNativeQueries)
• KT-21745 Warning and quickfix about kotlin-stdlib-jre7/8 -> kotlin-stdlib-jdk7/8 in Maven
• KT-21746 Warning and quickfix about kotlin-stdlib-jre7/8 -> kotlin-stdlib-jdk7/8 in Gradle
• KT-21753 Language injection: SpEL. Not injected for key in [@Caching](https://github.com/Caching)
• KT-21771 All annotations in Annotations.kt from kotlin-test-js module wrongly have ACTUAL_MISSING
• KT-21831 Opening class from kotlin-stdlib-jdk8.jar fails with EE: "Stub list in ... length differs from PSI"
• KT-22229 Kotlin local delegated property Import auto-removed with "Java: Optimize imports on the fly"
• KT-22724 ISE: "psiFile must not be null" at KotlinNodeJsRunConfigurationProducer.setupConfigurationFromContext()
• KT-22817 Hitting 'Propagate Parameters' in Change Signature throws UnsupportedOperationException
• KT-22851 Apply button is always active on Kotlin compiler settings tab
• KT-22858 Multiplatform: String constructor parameter is reported in Java file of jvm module on creation of a new instance of a class from common module
• KT-22865 Support multiple expectedBy dependencies when importing project from Gradle or Maven
• KT-22873 Common module-based light classes do not see JDK
• KT-22874 Exception on surround with "if else" when resulting if should be wrapped with ()
• KT-22925 Unable to view Type Hierarchy from constructor call in expression
• KT-22926 Confusing behavior of Type Hierarchy depending on the caret position at superclass constructor
• KT-23097 Enhance multiplatform project wizard
• KT-23271 Warn about using kotlin-stdlib-jre* libs in dependencyManagement section in Maven with eap and dev Kotlin versions
• KT-20672 IDE can't resolve references to elements from files with [@JvmPackageName](https://github.com/JvmPackageName)
• KT-23546 Variable name auto-completion popup gets in the way

IDE. Gradle. Script

• KT-23228 Do not highlight .gradle.kts files in non-Gradle projects

IDE. Inspections and Intentions

New Features

• KT-16382 Intention to convert expr.unsafeCast<Type>() to expr as Type and vice versa
• KT-20439 Intentions to add/remove labeled return to last expression in a lambda
• KT-22011 Inspection to report the usage of Java Collections methods on immutable Kotlin Collections
• KT-22933 Intention/inspection to convert Pair constructor to to function
• KT-19871 Intentions for specifying use-site targets for an annotation
• KT-22971 Inspection to highlight and remove unnecessary explicit companion object references

Fixes

• KT-12226 "Convert concatenation to template" does not process $ sign as a Char
• KT-15858 "Replace with a foreach function call" intention breaks code
• KT-16332 Add braces to 'if' statement intention does not put end-of-line comment properly into braces
• KT-17058 "Create implementations from headers": each implementation gets own file
• KT-17306 Don't report package name mismatch if there's no Java code in the module
• KT-19730 Quickfix for delegated properties boilerplate generation doesn't work on locals
• KT-21005 "Missing KDoc inspection" is broken
• KT-21082 "Create actual declaration" of top-level subclass of expected sealed class in the same file as actual declaration of sealed class present
• KT-22110 "Can be joined with assignment" inspection underlining extends into comment
• KT-22329 "Create class" quickfix is not suggested in when branch
• KT-22428 Create member function from usage shouldn't present type parameters as options
• KT-22492 "Specify explicit lambda signature" intention is available only on lambda braces
• KT-22719 Incorrect warning 'Redundant semicolon' when having method call before lambda expression
• KT-22861 "Add annotation target" quickfix is not available on annotation with use site target
• KT-22862 "Add annotation target" quickfix does not process existent annotations with use site target
• KT-22917 Update order of containers for create class quickfix
• KT-22949 NPE on conversion of run/apply with explicit lambda signature to let/also
• KT-22950 Convert stdlib extension function to scoping function works incorrectly in case of explicit lambda signature
• KT-22954 "Sort modifiers" quickfix works incorrectly when method is annotated
• KT-22970 Add explicit this intention/inspection missing for lambda invocation
• KT-23109 "Remove redundant 'if' statement" inspection breaks code with labeled return
• KT-23215 "Add function to supertype" quickfix works incorrectly
• KT-14270 Intentions "Add/Remove braces" should be applied to the statement where caret is if there several nested statements one into another
• KT-21743 Method reference not correctly moved into parentheses
• KT-23045 AE “Failed to create expression from text” on concatenating string with broken quote mark char literal
• KT-23046 CCE ”KtBinaryExpression cannot be cast to KtStringTemplateExpression” on concatenating broken quote mark char literal with string
• KT-23227 "Add annotation target" quickfix is not suggested for field: use-site target

IDE. Refactorings

Fixes

• KT-13255 Refactor / Rename: renaming local variable or class to existing name gives no warning
• KT-13284 Refactor / Rename: superfluous imports and FQNs in Java using [@JvmOverloads](https://github.com/JvmOverloads) functions
• KT-13907 Rename refactoring warns about name conflict if there is function with different signature but the same name
• KT-13986 Full qualified names of classes in comments should be changed after class Move, if comment contains backquotes
• KT-14671 typealias: refactor/rename should propose to rename occurrences in comments
• KT-15039 Extra usage is found for a parameter in data class in destructuring construction
• KT-15228 Extract function from inline function should create public function
• KT-15302 Reference to typealias in SAM conversion is not found
• KT-16510 Can't rename quoted identifier is
• KT-17827 Refactor / Move corrupts bound references when containing class of member element is changed
• KT-19561 Name conflict warning when renaming method to a name matching an extension method with the same name exists
• KT-20178 Refactor → Rename can't make companion object name empty
• KT-22282 Moving a Kotlin file to another package does not change imports in itself
• KT-22482 Rename refactoring insert qualifier for non related property call
• KT-22661 Refactor/Move: top level field reference is not imported automatically after move to the source root
• KT-22678 Refactor / Copy: "Class uses constructor which will be inaccessible after move" when derived class has a protected constructor
• KT-22692 Refactor/Move: unnecessary curly braces added on moving to a separate file a top level function with a top level field usage
• KT-22745 Refactor/Move inserts FQ function name at the call site if there is a field same named as the function
• KT-22747 Moving top-level function to a different (existing) file doesn't update references from Java
• KT-22751 Refactor/Rename: type alias name clash is not reported
• KT-22769 Refactor/Move: there is no warning on moving sealed class or its inheritors to another file
• KT-22771 Refactor/Move: there is no warning on moving nested class to another class with stricter visibility
• KT-22812 Refactor/Rename extension functions incorrectly conflicts with other extension functions
• KT-23065 Refactor/Move: Specify the warning message on moving sealed class inheritors without moving the sealed class itself

IDE. Script

• KT-22647 Run script Action in IDE should use Kotlin compiler from the IDE plugin
• KT-18930 IDEA is unstable With Gradle Kotlin DSL
• KT-21042 Gradle Script Kotlin project is full-red
• KT-11618 Running .kts file from IntelliJ IDEA doesn't allow to import classes in other files which are also part of the project

IDE. Debugger

• KT-22205 Breakpoints won't work for Kotlin testing with JUnit

JavaScript

• KT-22019 Fix wrong list sorting order

Tools. CLI

• KT-22777 Unstable language version setting has no effect when attached runtime has lower version

Tools. Gradle

• KT-22824 expectedBy dependency should be expressed as compile dependency in POM
• KT-15371 Multiplatform: setting free compiler args can break build
• KT-22864 Allow multiple expectedBy configuration dependencies in Gradle
• KT-22895 'kotlin-runtime' library is missing in the compiler classpath sometimes
• KT-23085 Use proper names for the Gradle task inputs/outputs added at runtime

Tools. Incremental Compile

• KT-20516 "Unresolved reference" when project declares same class as its dependency
• KT-22542 "Source file or directory not found" for incremental compilation with Kobalt
• KT-23165 Incremental compilation is sometimes broken after moving one class

Tools. JPS

• KT-16091 Incremental compilation ignores changes in Java static field
• KT-22995 EA-91869 - NA: LookupStorage.<init>

Tools. kapt

• KT-21735 Kapt cache was not cleared sometimes

Tools. REPL

• KT-21611 REPL: Empty lines should be ignored