title: SDCC compiler switch statement, what is ack: section for?
body: <p>I saw the following code in CCTL (~line 330) <a href="https://github.com/jobytaffey/cctl/blob/master/cctl/main.c" rel="nofollow">https://github.com/jobytaffey/cctl/blob/master/cctl/main.c</a></p>
  
  <pre><code>switch(page)
  {
     // ...
     ack:
        cons_putc(0);
  }
  </code></pre>
  
  <p>What is the <code>ack:</code> section for?  It looks like same as <code>default:</code> to me.  I can't find it in the SDCC docs either.</p>
  
  <p>Is this something in C spec?</p>
  
  <p>Thank you</p>