Kotlin v2.4.0-Beta2 released!

NewsBot · 22 April 2026 12:25

Kotlin v2.4.0-Beta2 has been released.

Changelog

Analysis API

KT-65683 Analysis API: Dangling file session creation causes a computeIfAbsent contract violation

Analysis API. FIR

KT-70896 AA: False positive deprecation warning with override of built-in method in JDK mapped class

KT-84625 Analysis API: collectDesignationPath fails for nested classes inside plugin-generated top-level classes

Analysis API. Infrastructure

KT-84913 Extract compiler classes used by the PSI & Analysis API to a separate module

KT-64986 Analysis API: Implement Analysis API tests for different KMP Platforms

KT-80379 Extract per-module test generators for AA tests

Analysis API. PSI

KT-84715 removeModifier doesn’t delete whitespaces around the removed modifier

KT-84564 KtEnumEntry.delete deletes semicolon

KT-84781 Use computed properties in KotlinElementTypeProviderImpl

Analysis API. Stubs and Decompilation

KT-85371 StackOverflowError from LLKotlinStubBasedLibrarySymbolProvider and StubBasedClassDeserialization

KT-83935 Support KDoc loading in decompiled stubs

Analysis API. Surface

KT-82519 Automatically recognize the appropriate analysis mode for in-memory file copies based on their content

KT-85239 Streaming version of collectDiagnostics()

[KT-83921](https://youtrack.jetbrains…

Link: Release Kotlin 2.4.0-Beta2 · JetBrains/kotlin · GitHub