scala>  def putInt(l:collection.mutable.ListBuffer[Any]) {  l += 0 }
putInt: (l: scala.collection.mutable.ListBuffer[Any])Unit

scala>  import collection.mutable.ListBuffer

val list = new ListBuffer[String]
import collection.mutable.ListBuffer

scala> list: scala.collection.mutable.ListBuffer[String] = ListBuffer()

scala>  putInt(list.asInstanceOf[ListBuffer[Any]])

scala>  println(list)
ListBuffer(0)