Inline convertion in pattern matching's `if` guard

Language Design
12 
object RefExtractor extends App {

  class Ref[T](val ref: AtomicReference[T]) extends AnyVal {
    def get(): T = {
      println("call ref.get")
      ref.get()
    }
    def isEmpty: Boolean = {
      println("call ref.get")
      ref.get() == null
    }
    def set(value: T): Unit = ref.set(value)
  }

  object Ref {
    def unapply[T](ref: AtomicReference[T]): Ref[T] = new Ref(ref)
  }

  val ref = new AtomicReference("hello")

  ref match {
    case Ref(value) => println(value)
  }

}

But what if the x is not directly available?

then you will see:

call ref.get
call ref.get
hello

It would be nice to save one of the call ref.get, @odersky is that possible? I knew this is possible at bytecode level, not sure how to express it at language.