title: What's the point of this kind of code?
body: <pre><code>{%{$self-&gt;param}}
  </code></pre>
  
  <p>It does hash expand, and then create another hash reference.</p>
  
  <p>But isn't <code>{%{$self-&gt;param}}</code> the same as <code>$self-&gt;param</code>? Why does the code bother doing the trick?</p>