title: Scheme (Racket) - Loop Libraries
body: <p>I have DrRacket Version 5.0.2, I've spent like 3 hours already looking for the right libraries to make <code>while</code>, <code>dolist</code>, and <code>dotimes</code> work. I know how to use them but I just can't find the right libraries. When I type <code>dotimes</code> for example it tells me unknown identifier.</p>
  
  <p>PS: Do you have to use <code>define-syntax</code> in order to define these loops? I've tried <code>(require srfi/42)</code> but it does not work. I'm using <code>#lang scheme</code>.</p>