scala隐式导致StackOverflowError

(削减我的原始代码,仍然导致错误)

object Complicit {
  // a class with name,default,and conversion function as implicit val
  case class CC[A](name: String,defaultValue: A)(implicit val convert: String => A) {
    def getFrom(s: String): A= try { 
      convert(s) 
    } catch { 
      case t: Throwable => 
        println("ERROR: %s".format(t))  // just to see the StackOverflowException
        defaultValue
    }
  }  

  // this works fine
  object Works {
    val cc1= CC("first",0.1)(_.toDouble)
  } 

  // this causes java.lang.StackOverflowError due to the implicit
  object Fails {
    // !!! StackOverFlowError here
    implicit val stringToDouble: String => Double= { _.toDouble }

    val cc2= CC("second",0.2)
  }

  def main(args: Array[String]) {
    // this works
    println("%s %f".format(Works.cc1.name,Works.cc1.getFrom("2.3")))
    // this fails
    println("%s %f".format(Fails.cc2.name,Fails.cc2.getFrom("4.5")))
  }
}

我是否在做违法行为？