title: Is it good style to use a case expression on a Unit value just to use guards?
body: <p>What is the recommended way of testing several boolean expressions ?</p>
  
  <p>I've been using this:</p>
  
  <pre><code>case () of () | test1 -&gt; value1
                | test2 -&gt; value2
                | otherwise -&gt; value3
  </code></pre>
  
  <p>Is this good style ? is there a prettier way ?</p>