<===> input.scss
div {
  $x : true;
  @while $x {
    stuff: 1;
    more-stuff: 2;
    even-more-stuff: 3;
    lets-stop-now: 4;
    $x: false;
  }
}
<===> output.css
div {
  stuff: 1;
  more-stuff: 2;
  even-more-stuff: 3;
  lets-stop-now: 4;
}