Kotlin v1.6.20 RC released, JVM-based programming language

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Kotlin is a statically typed, cross-platform, general-purpose programming language with type inference. Kotlin is designed to interoperate fully with Java, and the JVM version of its standard library depends on the Java Class Library, but type inference allows its syntax to be more concise. Kotlin mainly targets the JVM but also compiles to JavaScript or native code (via LLVM). Kotlin is sponsored by JetBrains, a software development company based in Prague, and is also backed by Google under the Kotlin Foundation.

Kotlin is officially supported by Google for mobile development on Android. Since the release of Android Studio 3.0 in October 2017, Kotlin is included as an alternative to the standard Java compiler. The Android Kotlin compiler lets the user choose between targeting Java 6 or Java 8 compatible bytecode.

Changelog v1.6.20 RC

Compiler

  • KT-51302 Kotlin/Native 1.6.20-M1 compiler fails because of assertion in NativeAnnotationImplementationTransformer
  • KT-51148 “AssertionError: At this stage there should be no remaining variables with proper constraints” caused by two type parameters
  • KT-50970 Kotlin/Native: use arm instruction set instead of thumb-2 for iosArm32 and watchosArm32 targets
  • KT-50843 Kotlin/Native: LLVM constant merge pass does not work for Kotlin constants
  • KT-51157 JVM / IR: “IndexOutOfBoundsException: Index: 1, Size: 1” caused by interface hierarchy and UInt method parameter
  • KT-50498 Exception after analysing an erroneous lambda
  • KT-51062 Progressions resolve changing warning isn’t reported for Java methods
  • KT-51040 Type inference fails on 1.6: “Cannot use ‘CapturedType(*)’ as reified type parameter” with EnumSet and elvis operator
  • KT-51022 Fix error messages for resolution ambiguity with stub types

Native

  • KT-51359 Native: the compiler doesn’t work on macOS 12.3 Beta

Native. Runtime. Memory

  • KT-50879 Kotlin/Native: Stabilize Concurrent Sweep GC
  • KT-50948 Kotlin/Native: Concurrent Sweep GC hangs on Windows in GCStateHolder::waitEpochFinished/waitScheduled

Tools. Android Extensions

  • KT-50784 kotlin-android-extensions produces unbound symbol under _$_findViewCache

Tools. CLI

  • KT-51309 Add JVM target bytecode version 18
  • KT-51025 JVM CLI compiler takes class file from classpath instead of input java source file

Tools. Daemon

  • KT-47522 Provide reasonable resolution strategy for OutOfMemoryError during compilation
  • KT-51116 OOM user-friendly message isn’t displayed if there is main exception caused by out of memory

Tools. Gradle

  • KT-51177 After updating from KGP 1.5.30 to 1.6.10, KotlinCompile is non-incremental given an Android resource change
  • KT-50719 Kotlin Gradle Plugin may hang on writing statistics
  • KT-48849 Cache miss due to empty directories in KotlinCompile inputs

Tools. Gradle. JS

  • KT-51060 KJS / IR: Incorrect order of libraries with IC
  • KT-50930 KJS / IR: Incremental compilation cache building not consider multiple artifacts

Tools. Gradle. Multiplatform

  • KT-50592 [Gradle][MPP] Mitigate isolated KGP classpath issues
  • KT-51176 CInteropCommonization: Warn users about disabled cinterop commonization when cinterops are present in hmpp

Tools. Gradle. Native

  • KT-49330 commonizeNativeDistribution: “ClassCastException: KotlinJvmProjectExtension_Decorated cannot be cast to class org.jetbrains.kotlin.gradle.dsl.KotlinProjectExtension”

Tools. Kapt

  • KT-48402 Kapt throws “Fatal Error: Unable to find package java.lang in classpath or bootclasspath” with JDK 16 and Kotlin 1.5.30
  • KT-48450 Allow to configure additional jvm arguments for ‘KaptWithoutKotlincTask`
  • KT-41456 Kotlin compilation failure after successful kapt causes invalid incremental builds

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