gistfile1.txt

scala> trait Speaker { def speak : Unit }
defined trait Speaker

scala> val f = () => { println("Hello!") }
f: () => Unit = <function>

scala> val m = new Speaker { def speak = f() }
m: java.lang.Object with Speaker = $anon$1@3a7f1228

scala> m.getClass
res11: java.lang.Class[_] = class $anon$1

scala> val n = m.getClass.newInstance.asInstanceOf[Speaker]
n: Speaker = $anon$1@2f56f920

scala> n.speak                                             
Hello!