Thin cake deprecation alternatives

ThinCake.scala

trait ACompo {
  @deprecated("foo", "1.1")
  def foo: String
}

trait BCompo {
  def foo: String
}
trait CCompo {
//  @deprecated("foo", "1.1")
//  def foo: String
}

// This is the only alternative that fails compilation or raises a warning of any kind.
class W extends CCompo { 
  override lazy val foo: String = "123"
}

class X extends ACompo with BCompo with CCompo {
  override lazy val foo: String = "123"
}

class Y extends BCompo with ACompo {
  override lazy val foo: String = "123"
}

// This doesn't raise a warning or compilation error despite ACompo#foo being depreacted
class Z extends ACompo {
  override lazy val foo: String = "123"
}