nhaarman
10/13/2016, 8:40 PMget() indeed, but the blocking is not what I want. The exceptionally { } method does give me a push in the right direction though.
For example, the following does what I want (crashing the app):
fun test() {
    val doSomething = doSomething()
    doSomething.exceptionally {
        Handler(Looper.getMainLooper()).post{
            throw it
        }
    }
}