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class Main {
 
def doIt(l : MyList) : Int = {
    l match {
    case Nil() =>
        print(0)
        0
    case Cons(v,t) => 
       print(v + doIt(t))
       v
    }
}
 
def main() = {
val ll = Cons(1,Cons(2,Cons(3,Nil())))
val k = doIt(ll)
}
}

Main.scala:3: error: not found: type MyList
def doIt(l : MyList) : Int = {
             ^
Main.scala:5: error: object Nil is not a case class constructor, nor does it have an unapply/unapplySeq method
    case Nil() =>
         ^
Main.scala:8: error: not found: value Cons
    case Cons(v,t) => 
         ^
Main.scala:9: error: not found: value v
       print(v + doIt(t))
             ^
Main.scala:10: error: not found: value v
       v
       ^
Main.scala:15: error: not found: value Cons
val ll = Cons(1,Cons(2,Cons(3,Nil())))
         ^
6 errors found

Standard output is empty