Quick question about type inference: ``` class Thi...

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[Ruckus]

Quick question about type inference:

class Thing {
  var debugger: ((String) -> Unit)? = null
}
val receiver = StringBuilder()
val thing = Thing()
thing.debugger = receiver::appendln  // Fails

The marked line fails since it cannot figure out which overload of println to use. It doesn't work if I change debugger to accept CharSequence or CharSequence? either.
Is this a bug or expected behaviour?