title: go how to check if a function exists
body: <p>Is there any way to check if a func exists in Go?</p>
  
  <p>In PHP I might do something like </p>
  
  <pre><code>if(function_exists('someFunction')) {
      //...
  }
  </code></pre>
  
  <p>but I have not been able to figure out how to do this in Go</p>
  
  <p>Any help on this will be greatly received.</p>