producer-scope select-scope problem SSCCE

resulting-error.log

java.lang.ClassCastException: kotlinx.coroutines.experimental.channels.ProducerCoroutine cannot be cast to kotlinx.coroutines.experimental.selects.SelectClause1

	at groostav.kotlinx.exec.CoroutineTests$when using select in producer to merge channels should operate normally$1$merged$1.doResume(CoroutineTests.kt:40)
	at kotlin.coroutines.experimental.jvm.internal.CoroutineImpl.resume(CoroutineImpl.kt:42)
	at kotlinx.coroutines.experimental.DispatchedTask$DefaultImpls.run(Dispatched.kt:162)
	at kotlinx.coroutines.experimental.DispatchedContinuation.run(Dispatched.kt:26)
	at java.util.concurrent.ForkJoinTask$RunnableExecuteAction.exec(ForkJoinTask.java:1402)
	at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289)
	at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056)
	at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1692)
	at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157)

select scope bug.kt

    @Test fun `when using select in producer to merge channels should operate normally`() = runBlocking<Unit> {

        val sourceOne = produce { send(1); send(2); send(3) }

        //inlining this var causes the test to pass
        var s1: ReceiveChannel<Any>? = sourceOne

        val merged = produce<Any>{
            while(isActive){ //removing this while causes the test to pass
                val next = select<Any> {
                    s1?.onReceive { it -> it }
                }
            }
        }

        merged.receiveOrNull()
        //does not reach here.
    }