Project Euler 02: Even Fibonacci numbers

gistfile1.scala

object Fibonacci extends App {
  val fibonacci: Stream[Int] = Stream.cons(
    1,
    Stream.cons(2,
      fibonacci.zip(fibonacci.tail).map(
        zipped => zipped._1 + zipped._2)))
  println(fibonacci.takeWhile(_ < 4000000).filter(_ % 2 == 0).sum)
}