LifecycleExtensions.kt

val balance = userHandler.user
            .switchMap { user -> 
                Log.d("myLog", "switchMap: $user")
                pusherManager.getUpdateBalancesLiveData(user)
            }
            .mapSuspended(context = BackgroundDispatcher) { unit ->
                Log.d("myLog", "gettingBalance")
                val balance = getBalance() // suspend fun
                balance
            }

inline fun <T : Any, R : Any> LiveData<T>.switchMap(
        crossinline transform: (T) -> LiveData<R>
): LiveData<R> = Transformations.switchMap(this) { it?.let(transform) }

inline fun <T : Any, R : Any> LiveData<T>.mapSuspended(
        context: CoroutineContext,
        crossinline transform: suspend (T) -> R
): LiveData<R> = object : MediatorLiveData<R>() {

    private var job: Job? = null
        set (value) {
            field?.cancel()
            field = value
        }

    init {
        addSource(this@mapSuspended) { t ->
            job = launch(context = context) { postValue(transform(t)) }
        }
    }

}

Crash on class cast exception
E/AndroidRuntime: FATAL EXCEPTION: ForkJoinPool.commonPool-worker-3
Process: myapp.debug, PID: 2942
java.lang.ClassCastException: kotlin.coroutines.experimental.intrinsics.CoroutineSuspendedMarker cannot be cast to myapp.core.Result
at myapp.domain.provider.WalletBalanceProvider$$special$$inlined$mapSuspended$1$1$1.doResume(LifecycleExtensions.kt:50) // line 29 above, postValue imho
at kotlin.coroutines.experimental.jvm.internal.CoroutineImpl.resume(CoroutineImpl.kt:42)
at kotlinx.coroutines.experimental.DispatchedTask$DefaultImpls.run(Dispatched.kt:150)
at kotlinx.coroutines.experimental.DispatchedContinuation.run(Dispatched.kt:14)
at java.util.concurrent.ForkJoinTask$RunnableExecuteAction.exec(ForkJoinTask.java:1412)
at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:285)
at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1152)
at java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1990)
at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1938)
at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157)

But when I remove inline everything works

Coroutines version: 0.24.0, Kotlin 1.2.71