gistfile1.scala

import scala.util.continuations._

def using[A <: {def close()}](resource: A)(op: A => Unit) = {
  try {
    Console.err.println("op")
    op(resource)
  }
  finally {
    Console.err.println("close")
    resource.close()
  }
}

reset {
  val w1 = shift(using(new PrintWriter("col1.txt")))
  val w2 = shift(using(new PrintWriter("col2.txt")))

  Console.err.println("A")
  Source.stdin.getLines().map(_.split("\t")).foreach {
    case Array(col1, col2, _*) =>
      w1.println(col1)
      w2.println(col2)
    case Array(col1) => w1.println(col1)
  }
  Console.err.println("B")
}