Kotlin v1.4.20-RC released!

NewsBot · 2 November 2020 14:06

Kotlin v1.4.20-RC has been released.

Compiler

New Features

KT-31567 Support special semantics for underscore-named catch block parameters

Performance Improvements

KT-41741 NI: “AssertionError: Empty intersection for types” with generic Java collection

KT-42195 NI: prohibitively long compilation time for values of nested data structures with type inference

KT-42221 Native compiler never finishes frontend phase after migrating to Kotlin 1.4.10

Fixes

KT-17691 Wrong argument order in resolved call with varargs

KT-25114 Prohibit @JvmStatic on functions in private companions

KT-33917 Prohibit to expose anonymous types from private inline functions

KT-35870 Forbid secondary enum class constructors which do not delegate to the primary constructor

KT-39098 NI: parameter of anonymous function can be inferred to Any? if another parameter’s type is specified

KT-41176 NI with Gson: “ClassCastException: java.util.ArrayList cannot be cast to java.lang.Void”

KT-41194 ClassCastException on returning Result.failure from lambda within suspend function

KT-42438 NI: ClassCastException: cannot be cast to java.lang.Void caused by when statement in run function

KT-42699 False positive NON_JVM_DEFAULT_OVERRIDES_JAVA_DEFAULT diagnostic in new jvm-default modes

KT-42706 Kotlin 1.4 infers generic is Nothing instead of actual Foo class (Android project)

IDE

KT-42883 No highlighting for elements marked as @Deprecated in stdlib

IDE. Decompiler, Indexing, Stubs

KT-41646 “AssertionError: ContentElementType: FILE”; Code analysis never finishes on some files from my project

IDE. Gradle Integration

KT-38830 addTransitiveDependenciesOnImplementedModules performance is slowing down Android Studio Gradle Sync

IDE. Inspections and Intentions

KT-43037 Disable “Incomplete destructuring declaration” in 1.4.20

JavaScript

KT-37829 Kotlin JS IR: “Properties without fields are not supported” for companion objects

KT-39740 KJS / IR: Can’t use Serializable and JsExport annotations at the same time

Libraries

KT-19192 Provide file system extensions/APIs based on java.nio.file.Path

KT-41837 Remove @ExperimentalStdlibApi from CancellationException

Tools. CLI

KT-41916 Add JVM target bytecode version 15

Tools. Gradle. JS

KT-42494 KJS / Gradle: “Configuration cache state could not be cached” caused by Gradle configuration cache

Tools. Gradle. Native

KT-42531 Gradle task “podGenIos” fails if a Pod with a static library is added.

Link: Release Kotlin 1.4.20-RC · JetBrains/kotlin · GitHub