Kotlin v2.3.20-Beta2 released!

NewsBot · 29 January 2026 13:25

Kotlin v2.3.20-Beta2 has been released.

Changelog

Analysis API. FIR

KT-83467 Package-level JSpecify annotations are ignored when coming from jars or libraries

KT-82846 AA: unresolved KtExpression.expressionType for the reference to the parameter with default value

Analysis API. Infrastructure

KT-83173 Analysis API Tests: Library names with RC versions aren’t sanitised

Analysis API. Surface

Performance Improvements

KT-83694 Provide psi-based implementation of KaDeclarationSymbol#isExternal

KT-70868 KaSymbol: support PSI-only visibility and modality for the case without compiler plugins

Fixes

KT-83152 [Analysis API, KDoc] Make class name links on constructors point to the class

KT-83695 Deprecate KaSymbolInformationProvider#{getter, setter}DeprecationStatus

KT-82853 Add a convenience property for testing declarations for effective external-ness

KT-83226 Support “Collection literals” in the Analysis API

KT-83225 Support “@IntroduceAt” in the Analysis API

KT-83222 Support “Improve use-site defaulting for annotations” in the Analysis API

KT-83351 Rename KaSession context parameter from ‘s’ in bridges to something nicer

KT-83199 Clarify API around extension points

KT-83074 Inner enum entry class has incorrect defa…

Link: Release Kotlin 2.3.20-Beta2 · JetBrains/kotlin · GitHub