Kotlin v2.3.0-RC released!

NewsBot · 18 November 2025 16:25

Kotlin v2.3.0-RC has been released.

Changelog

Backend. Wasm

KT-82075 K/Wasm: kotlin.wasm.internal.getSimpleName crashes on iOS Safari older than 26

Compiler

KT-82138 Debugger: Cannot evaluate JvmInline value class parameter

KT-78413 Kotlin Debugger: value classes as context parameters have incorrect names in Variables View during debugging

KT-80549 Call of Java method with type parameter bounds: Expected FirResolvedTypeRef with ConeKotlinType but was FirJavaTypeRef

KT-82132 False-positive type mismatch with -language-version 2.2

KT-81988 K2: Any?.toString() causes NPE inside lambda with Java

KT-82022 K/N: Unexpected “Annotation @JvmInline is missing on actual declaration” warning with value classes

Compose compiler

CMP-9167 iOS: Platform declaration clash: The following functions have the same IR signature

IR. Actualizer

KT-77337 IrNoExpectSymbolsHandler finds expect class reference after enabling annotation traversal in IR

IR. Tree

KT-81952 “IllegalStateException: Callable reference with vararg should not appear at this stage” for callable references to functions with generic vararg parameters

JVM. Reflection

KT-81967 isSubtypeOf: ClassCastException: CapturedKType cannot be cast to class AbstractKType

KT-81619 Reflection: Function supertype of a FunctionN class has flexible type in new implementation
…

Link: Release Kotlin 2.3.0-RC · JetBrains/kotlin · GitHub