title: What does the comment "COMBAK" mean?
body: <p>I was looking at the vimscript syntax file in the syntax directory, and under the keyword vimTodo were the words <code>COMBAK</code>, <code>FIXME</code>, <code>TODO</code>, and <code>XXX</code>. I can figure out what <code>FIXME</code> and <code>TODO</code> mean pretty easily, and I can guess what some might use <code>XXX</code> for, but I have no idea what <code>COMBAK</code> is for.</p>
  
  <p>It must have a meaning of some sort, else there would be no reason to highlight it. I get that it's a code tag, but what does it mean? My best guess so far is an abbreviation for COMEBACK, though I doubt this.</p>
  
  <p>Here is what I found so far:</p>
  
  <p>Googling it got me nothing of use, and a google code search for <code>COMBAK</code> (with or without the quotes) got 0 results. I eventually Googled <code>codetag "COMBAK"</code> and found a single result, which uses it as a tag in a comment twice (a [ctrl+F] will find it): <a href="http://pastebin.com/H6mjbyBh" rel="noreferrer">http://pastebin.com/H6mjbyBh</a>.</p>
  
  <p>The program is written in Vimscript, and contains both a vimscript syntax file and vimscript indent plugin file for lisp, along with some other massive functions.</p>