trait Talkative {def greeting: String}

trait English extends Talkative {
  override def greeting(): String = "Hello!"
}

trait German extends Talkative {
  override def greeting(): String = "Guten Tag!"
}

trait French extends Talkative {
  override def greeting(): String = "Bonjour!"
}

class Speaker extends French with German with English
val speaker = new Speaker

// The last Trait (with clause) is going to have precedence.
assert(speaker.greeting() == "Hello!")

// Changing the type does *not* change it.
assert(speaker.asInstanceOf[German].greeting() == "Hello!")
assert(speaker.asInstanceOf[English].greeting() == "Hello!")
assert(speaker.asInstanceOf[French].greeting() == "Hello!")