class Finished {}
let FINISHED = new Finished {};

class Iterator {
  current: f64;

  fun next(self) -> f64 or Finished {
    if self.current < 10 {
      let result = self.current;
      self.current = self.current + 1;
      return result;
    }

    FINISHED
  }
}


fun test() -> f64 {
  let result = 1;
  let i = 0;
  while i < 10 {
    result = result * 2;
    i = i + 1;
  }

  let sum = 0;
  let it = new Iterator { current: 0 };
  while it.next() is v: f64 {
    sum = sum + v;
  }

  result + sum
}

// @no-errors
// @eval: Float(1069.0)