Kotlin v2.4.0-Beta1 released!

NewsBot · 31 March 2026 15:25

Kotlin v2.4.0-Beta1 has been released.

Changelog

Analysis API

KT-83867 OVERLOAD_RESOLUTION_AMBIGUITY false positive with assertEquals in IJ repo

KT-83723 [Analysis API] Enable experimental KDoc resolver by default

KT-83388 Analysis API: properly support KMP in KotlinPackageProvider

Analysis API. Code Compilation

KT-78946 Evaluation of variable with local class in type parameter leads to InventNamesForLocalClasses exception

Analysis API. FIR

KT-84711 K2 IDE sometimes loses FIR plugin-generated declarations after file changes

KT-84596 Improve K2 Jooq completion performance

KT-84525 KaValueParameterSymbol#getHasSynthesizedName returns false for FirDeclarationOrigin.SubstitutionOverride.DeclarationSite

KT-68260 K2 AA: InvalidFirElementTypeException “For CALLABLE_REFERENCE_EXPRESSION with text ::lam1, unexpected element of type: no element found” with illegal callable reference call

KT-83546 Kotlin analysis reach ClsCustomNavigationPolicy

KT-84259 Move CommonDefaultImportsProvider to the frontend independent module

KT-82945 Analysis API: KotlinIllegalArgumentExceptionWithAttachments: Expected FirResolvedTypeRef with ConeKotlinType but was FirUserTypeRefImpl

KT-71135 AA: exception from sealed inheritors checker when analyzeCopy

Analysis API. Infrastructure

KT-84776 The test d…

Link: Release Kotlin 2.4.0-Beta1 · JetBrains/kotlin · GitHub