Some silly loops and perfectly sensible capture semantics. Based on an example of Erik Meijer, translated from c#. Normal people use the `for(i <- x)` style loop in Scala.

bad-loops.scala

def loopA = {
  // 0 1 2 3
  var i = 0
  while(i < 4) {
    print(i)
    i = i + 1
  }
  println("")
}

def loopB = {
  // 4 4 4 4
  var i = 0
  val closures = new Array[() => Unit](4)
  while(i < 4) {
    closures(i) = () => print(i)
    i = i + 1
  }
  for(c <- closures) c()
  println("")
}

def loopC = {
  // 0 1 2 3
  var i = 0
  val closures = new Array[() => Unit](4)
  while(i < 4) {
    val j = i
    closures(i) = () => print(j)
    i = i + 1
  }
  for(c <- closures) c()
  println("")
}