import scala.util.continuations._

// Good!
class SusppendableMethodInAnyRef[Value](val underlying: Int) extends AnyRef {
  final def foo[A](accessor: List[A]): List[A] @suspendable = {
    val result: List[A] = shiftUnit[List[A], Unit, Unit](accessor)
    result
  }
}

// Bad!
class SusppendableMethodInAnyVal[Value](val underlying: Int) extends AnyVal {
  final def foo[A](accessor: List[A]): List[A] @suspendable = {
    val result: List[A] = shiftUnit[List[A], Unit, Unit](accessor)
    result
  }
}