You won't be able to compile this.

NoDynamics.scala

// You won't be able to compile this with:

//    scala -language:dynamics NoDynamics.scala

// These two ambiguous implicits disable the `dynamics` feature.
implicit def ambDynamics1: language.dynamics.type = ???
implicit def ambDynamics2: language.dynamics.type = ???

object Woo extends Dynamic {
  def selectDynamic(name: String) = s"$name a mess of a language"
}

println(Woo.wat)