Hey. Why I can't implement interface with only met...

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[punksta]

Hey. Why I can't implement interface with only method by lambda?

interface Listener1Owner<out T> {
    fun setListener(listener: ((T) -> Unit)?)
}
//interface Listener1Owner does not have constructor
val l:Listener1Owner<String> = Listener1Owner<String>{event :String -> event.length}