KSP2: "Unresolved reference" in common code for entities annotated with SealedObjectInstances

[Tapchicoma]

Originally reported in Kotlin bug tracker here

In Kotlin multiplatform module that depends on SealedObjectInstances KSP library to generate the sealedObjectInstances() extension on the Entity Companion object build fails with Kotlin 2.0.0-Beta1 and KSP 2.0.0-Beta1-1.0.15 versions:

e: file:///home/runner/work/SealedObjectInstances/SealedObjectInstances/multi/src/commonMain/kotlin/com/example/Entity.kt:27:47 Unresolved reference 'sealedObjectInstances'.
> Task :multi:compileKotlinJvm FAILED

Repro is available here: SimonMarquis/SealedObjectInstances#163

[SimonMarquis]

The current workaround is to provides a bridge layer of actual / expect (SimonMarquis/SealedObjectInstances@2959384)

// src/commonMain/kotlin/com/example/Entity.kt
internal expect fun Entity.Companion.all(): Set<Entity>

// src/jvmMain/kotlin/com/example/Entity.jvm.kt
internal actual fun Entity.Companion.all(): Set<Entity> = sealedObjectInstances()

---

Note that the workaround mentioned here does not seem to work:

• Multiplatform example in IntelliJ IDEA: "Unresolved reference: Foo" #963 (comment)