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import Stream._
trait Stream[+A]
 
case object Empty extends Stream[Nothing]
case class Cons[+A](h: () => A, t: () => Stream[A]) extends Stream[A]
 
object Stream {
  def constant[A](a: A): Stream[A] = { 
    lazy val tail: Stream[A] = Cons(() => a, () => tail)
    tail
  }
}
 
object Main extends App {
  println(constant(5).take(3).toList)
}

/opt/scala/bin/scalac: line 50: /dev/null: Permission denied
Main.scala:15: error: value take is not a member of Stream[Int]
  println(constant(5).take(3).toList)
                      ^
one error found
spoj: The program compiled successfully, but Main.class was not found.
      Class Main should contain method: def main(args: Array[String]).

Standard output is empty