'Kotlin SAM interface and method reference

I am a bit confused why I can do the following

val outputter1: (s: String) -> Unit = ::println

but when I do

val outputter2: Outputter = ::println

given

fun interface Outputter {
    fun output(output: String)
}

I get a compilation error

None of the following functions can be called with the arguments supplied.
println() defined in kotlin.io
println(Any?) defined in kotlin.io
...

Shouldn't method references translate to SAM inteface types as well as Function types?

kotlin

Sources

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