OtherExample.hx

var run = true;

Thread.create(function () {
  Sys.getChar(true);
  run = false;
});

while (run) {
  Sys.sleep(.5);
  println('yay');//assume this would block until the other side reads in fact
}
 
//becomes:

var done = false;
function loop() 
  return 
    if (done) Halt(null);
    else 
      Held(Future.async(function (cb) 
        haxe.Timer.delay(function () cb(Emit(Right('yay'), loop())), 500);
      ));

Emit(
  Left(function (_) {
    var wasFirst = done == false;
    done = true;
    return wasFirst;
  }),
  loop()
);