gistfile1.scala

// pseudo-Scala with nonexistent "yield" in while

val generator =
  while(true) {
    val in = readLine()
    if (in == null)
      break
    yield in
  }

// suggested replacement

val iterator =
  Iterator.continually(readLine())
    .takeWhile(_ != null)

// replace Iterator.continually with Stream.continually if you want something
// that can be iterated over more than once