title: Reference to extension function?
body: <p>Is it possible to get reference to an extension function like you may do for usual function (see <a href="https://kotlinlang.org/docs/reference/reflection.html#function-references" rel="noreferrer">here</a>)?</p>
  
  <p>I would expect the following code to compile, but now <code>::String.toSomething</code> is unknown:</p>
  
  <pre><code>fun String.toSomething() = length + 1
  val some = listOf("lala", "bebebe").map(::String.toSomething)
  </code></pre>