Here's one solution I found for fighting with type erasure warnings.

gistfile1.sbt

object typeErasure {
  def main(args: Array[String]) {
    val evenOdd = 1.to(10)
      .map{x => if (x%2==0) { Option[Int](x) } else { None } }
      .partition{ case Some(_) => true case _ => false }
    println(evenOdd)
  }
}