scala implicit 小样

object run{
  class a{
    def run(){
      print("run")
    }
  }
  class b{
    def fly(): Unit ={
      print("fly")
    }
  }
  def main(args: Array[String]): Unit = {
    implicit def a2b(a:a) =new b();
    var a = new a()
    a.fly()
  }
}