title: How do I delete a directory in common lisp
body: <p>To delete a file in Common Lisp I can do:</p>
  
  <pre><code>(delete-file "c:\\path\\to\\file")
  </code></pre>
  
  <p>But for some reason I'm unable to find out how to delete a directory. There is no <code>delete-directory</code>, and when I pass a directory path to <code>delete-file</code> I get:</p>
  
  <pre><code>couldn't delete c:\path\to\folder: Unknown error
     [Condition of type SB-INT:SIMPLE-FILE-ERROR]
  </code></pre>
  
  <p>Googling didn't help either.</p>
  
  <p>I'm using Steel Banks Common Lisp on Windows, installed using Lispstick.</p>