title: "operator expected after expression" when using dynamic openList/1
body: <p>I'm trying to call the following at the top of my prolog file.</p>
  
  <pre><code>:- dynamic openList/1, dynamic closedList/1.
  </code></pre>
  
  <p>But this results in the following syntax error.</p>
  
  <pre><code>syntax error: . or operator expected after expression
  </code></pre>
  
  <p>I can't figure out what I'm doing wrong?</p>
  
  <p>Thanks in advance.</p>