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  1. object Main extends Application {
  2.     implicit def safeCast[X,Y, _ >: X <: Y]( x:X ):Y = x.asInstanceOf[Y]
  3.     case class L[X](val x: X) { def double[_ >: X <: Int] = x*2 }
  4.  
  5.     override def main(args: Array[String]) = {
  6.         println(L(42).double)
  7.     }
  8. }
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin 
Standard input is empty
compilation info 
Main.scala:3: error: value * is not a member of type parameter X
    case class L[X](val x: X) { def double[_ >: X <: Int] = x*2 }
                                                             ^
one error found
spoj: The program compiled successfully, but Main.class was not found.
      Class Main should contain method: def main(args: Array[String]).
stdout 
Standard output is empty
https://ideone.com/bpLenc
language:
Scala (scala 2.12.8)
created:
12 years ago
visibility:
public

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