I think this may be due to some issues with generics. I’m using an Either/Result class to wrap my return type in my Kotlin Native code. In iOS, it apparently doesn’t see the type at all, and instead refers to it as

kobjcc0

The frustrating part is that when I print the description of my object out in Xcode, the object that I want is there in the type I expect it to be represented (as a pair)

I’ve tried using the generics compiler flag

binaries.framework {
     freeCompilerArgs += "-Xobjc-generics"
}

But it didn’t really help with this case

Here’s what my Either class looks like

sealed class Either<out L, out R> {
    data class Error<out L>(val value: L) : Either<L, Nothing>()
    data class Success<out R>(val value: R) : Either<Nothing, R>()

    val isSuccess get() = this is Success<R>
    val isError get() = this is Error<L>

    fun <L> error(value: L) = Error(value)
    fun <R> success(value: R) = Success(value)

    fun either(fnL: (L) -> Any, fnR: (R) -> Any): Any =
            when (this) {
                is Error -> fnL(value)
                is Success -> fnR(value)
            }

    suspend fun eitherSuspend(fnL: suspend (L) -> Any, fnR: suspend (R) -> Any): Any =
            when (this) {
                is Error -> fnL(value)
                is Success -> fnR(value)
            }
}

@Artyom Degtyarev [JB] I'm not sure what you mean, since I usually have to access the Either values by using the either folding function

Here's the project repo if it helps https://github.com/RyanSimon/kmp-experiment

The problem specifically manifests at the ViewController call site in the iOS project

this worked for me

tasks.withType<org.jetbrains.kotlin.gradle.tasks.KotlinNativeLink>().configureEach {
    this.binary.freeCompilerArgs += "-Xobjc-generics"
}

i was just messing up the compiler args