Kotlin v2.1.21-RC released!

NewsBot · 17 April 2025 14:32

Kotlin v2.1.21-RC has been released.

Changelog

Backend. Native. Debug

KT-75991 Xcode 16.3: Fix lldb stepping test over an inline function

Compiler

KT-75992 Xcode 16.3: stacktraces on simulators are not symbolicated

KT-76663 KJS: KotlinNothingValueException caused by expression return since 2.1.20

KT-75756 Backend Internal error: Exception during IR lowering when trying to access variable from providedProperties in class within kotlin custom script

KT-76209 CONFLICTING_UPPER_BOUNDS on Nothing bound

KT-70352 K2: False-negative CONFLICTING_UPPER_BOUNDS on Nothing bound

KT-74739 Native: “IllegalArgumentException: All constructors should’ve been lowered: FUNCTION_REFERENCE”

KT-75483 Native: redundant unboxing generated with smart cast

KT-71425 IR Inliner: investigate return type of an inlined block

Compose compiler

b/408013789 Add missing return for the default function wrappers

b/405541364 Realize coalescable children in the body of key call

b/401484249 Generate a group around Array constructor call

b/400380396 Fix missing endMovableGroup call with early return in key function

Native

KT-76252 Native: executable crash with generic value classes with 2.1.20

Native. C and ObjC Import

[`KT-7578…

Link: Release Kotlin 2.1.21-RC · JetBrains/kotlin · GitHub