nyan.scala

object Nyan {
  class A {
    def nyan = "A"
  }

  implicit class B (self:A){
    def nyan = "B"
    def wan = "B"
  }

  def main(args:Array[String]) = {
    val a = new A
    println(a.nyan)
    println(a.wan)
  }
}

result.txt

> run
[info] Compiling 1 Scala source to /Users/shinpei/nekogata/nyan/target/scala-2.10/classes...
[info] Running Nyan 
A
B
[success] Total time: 1 s, completed 2014/03/23 21:39:26