JetBrains/kotlin v1.6.0-RC

Kotlin 1.6.0-RC

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Learn how to install Kotlin 1.6.0-RC.

Changelog

Compiler

Fixes

• KT-49157 Tail-call optimization miss with cast to type parameter
• KT-48778 -Xtype-enhancement-improvements-strict-mode not respecting @NonNull annotation for property accesses?
• KT-46437 NI: "Throwable: Resolution error of this type shouldn't occur for resolve if as a call" caused by reflectively accessing private property inside "if/else" or "when" expression
• KT-48590 IllegalArgumentException: ClassicTypeSystemContext couldn't handle: Captured(*) reified type class reference
• KT-48261 "overload resolution ambiguity" for JSpecify+jsr305-annotated Java List implementation
• KT-48633 Can't infer builder inference's type argument across local class
• KT-49136 JVM IR: NPE with safe call chain and property set to null by reflection
• KT-48912 K/N Symbol with IrSimpleFunctionSymbolImpl is unbound and JS Validation failed in file shaders.kt
• KT-48928 Prohibit using old JVM backend with language version >= 1.6
• KT-41978 NI: Kotlin fails to infer type of function argument
• KT-48732 JVM / IR: MalformedParameterizedTypeException is thrown when a Spring Bean of suspending function type is registered
• KT-47841 Turning LV to 1.6 breaks some diagnostics based on jspecify annotations
• KT-48498 JVM IR: IllegalAccessError with inline function call and property delegation from different module
• KT-48319 JVM / IR: AssertionError: FUN caused by suspend lambda inside anonymous function
• KT-48835 Psi2ir: vararg parameter value is lost when translating adapted function reference to base class member
• KT-46908 JVM / IR: do not wrap fun interface implementation into another SAM adapter if it inherits from a functional type
• KT-48927 JVM IR: "VerifyError: Bad invokespecial instruction: current class isn't assignable to reference class" when up-casting and read a base class's private property that has a custom getter in the base class's public function
• KT-48992 Postpone migration to new operator resolution scheme for integer literals
• KT-48290 Type bounds warning based on Java annotations not issues with language level 1.6
• KT-47920 There is no warning on violated nullability of type parameter in accordance with java nullability annotation
• KT-48851 Keep using warn mode for jspecify in 1.6
• KT-46829 IR: NullPointerException caused by setting scoped generic extension var
• KT-44843 PSI2IR: "org.jetbrains.kotlin.psi2ir.generators.ErrorExpressionException: null: KtCallExpression" with delegate who has name or parameter with the same name as a property
• KT-42972 Forbid protected constructor calls from public inline functions
• KT-45378 Prohibit super calls in public-api inline functions
• KT-48515 JSpecify: If a class has a @Nullable type-parameter bound, Kotlin should still treat unbounded wildcards like platform types
• KT-48825 JVM IR: NPE with delegated property "by this" to base class
• KT-48535 Make EXPERIMENTAL_ANNOTATION_ON_OVERRIDE warning
• KT-48478 JVM IR: Coroutines 1.5.1 + Kotlin 1.5.30 - ClassCastException: CompletedContinuation cannot be cast to DispatchedContinuation
• KT-48671 JVM / IR: "AssertionError: Primitive array expected: CLASS IR_EXTERNAL_DECLARATION_STUB CLASS"
• KT-46181 JVM IR: private @JvmStatic function is generated in the outer class instead of companion object, which breaks existing calls via JNI or reflection (e.g. JUnit @MethodSource)
• KT-48736 JVM IR: assert in SyntheticAccessorLowering when inline function attempts to access package-private field from Java
• KT-20542 IllegalAccessError on calling private function with default parameters from internal inline function used in another package
• KT-48331 JVM / IR: "VerifyError: Bad access to protected data in invokevirtual" when a sealed class uses another sealed class in its same hierarchy level as a constructor parameter
• KT-48659 JVM / IR: Referential equality returns true for different instances
• KT-48606 [1.6] Instantiated annotations do not implement hashCode correctly/consistently
• KT-48316 "No value passed for parameter" regression with Java annotation default values with JSR-305
• KT-48391 JVM / IR: "AssertionError: SyntheticAccessorLowering should not attempt to modify other files!" caused by class which inherits interface which has default function with default argument from companion const val

IDE. Gradle Integration

• KT-46273 MPP: Don't fail import for case of missed platform in source set structure
• KT-48823 Improve error reporting on import when configuration phase in Gradle failed
• KT-48504 MPP: UninitializedPropertyAccessException on import if new hierarchical mpp flag conflicts with other flags

Libraries

New Features

• KT-46423 infix extension fun Comparable.compareTo
• KT-47421 Stabilize collection builders

Performance Improvements

• KT-45438 Remove brittle ?contains? optimization in minus/removeAll/retainAll

Fixes

• KT-47304 Random#nextLong generates value outside provided range
• KT-48999 Align behavior of some JS functions with their JVM counterpart
• KT-28378 Different behavior of Regex replace function in Java and JS when replacement string contains group reference
• KT-46229 Bring back Duration factory extension properties
• KT-46243 Typography.leftGuillemete and Typography.rightGuillemete are named inconsistent with standard
• KT-46101 Review deprecations in stdlib for 1.6
• KT-48456 Introduce Common (multi-platform) readln() and readlnOrNull() top-level functions
• KT-38754 Deprecate appendln in favor of appendLine

Native

• KT-48807 Cinterop: cannot create bindings for a framework when Xcode 13 RC is installed

Tools. CLI

• KT-49007 Support three previous API versions

Tools. Compiler Plugins

• KT-48842 Compiler crash: Symbol with IrFieldSymbolImpl is unbound
• KT-48117 Kotlin AllOpen Plugin should open private methods

Tools. Gradle

• KT-48745 JVM target compatibility check should be disabled when Java sources are empty
• KT-49066 Setting kotlinOptions.modulePath in an android project breaks incremental compilation
• KT-48847 Remove deprecated kotlin options marked for removal after 1.5
• KT-48245 KGP makes compileOnly configuration resolvable
• KT-48768 Misleading 'jdkHome' deprecation message

Tools. Gradle. Multiplatform

• KT-48919 Gradle multiplatform plugin 1.6.0-M1 does not accept apiVersion = "1.7"

Tools. Scripts

• KT-49012 Compiling .kts script with inner class declaration fails with Backend Internal Error caused by AE: "Local class constructor can't have dispatch receiver"

Tools. kapt

• KT-45545 Kapt is not compatible with JDK 16+
• KT-47934 KaptJavaLog is unable to map stub back to the kotlin source