Hi, I have a following hierarchy: androidMain: actual class Provider { actual fun convert(input: Input): String = "" } commonMain: abstract class Input expect class Provider { fun convert(input: Input): String } But build failed with: Expected convert has no actual declaration in module resource_debug for JVM. Build is successful after change data type of parameter from Input to String. Is it bug in compiler?

Seems like a bug Which version of kotlin are you using?

Kotlin "1.9.0"

Hm, it's strange 1.9.0 should support even more than such basic cases Could you please report and issue and attach project with reproducer please?

And abstract class (Input ) is ok?

Yes, it's fine The same code as compiler test successfully compiles, so most likely the problem somewhere in your project setup It may be a misconfiguration or problem inside Kotlin Gradle plugin or Android Gradle plugin

Does K2 support Compose Multiplatform 1.5.1? When Compose is removed from Gradle then build is ok.

I don't know about particular Compose versions cc @shikasd

Not sure about multiplatform Compose versions as well :)