title: Syntax highlighting bugs of VIM 7.3 for BASH scripts
body: <p>I just upgraded OS from Ubuntu 8.04 to Ubuntu 12.04, as well as the corresponding VIM package. However, I found the syntax highlighting of newer VIM for BASH scripts is strange: (1) the colors of open and close parenthesis are different; (2) the color of comments seems wrong; (3) the BASH keyword in comment should not be highlighted. I have already add <code>let g:is_bash=1</code> and <code>syntax on</code> into my ".vimrc" file. I am not sure whether this is a bug of VIM or something wrong of my settings. Any solutions to this problem? Thanks.</p>
  
  <p>The screenshot of wrong syntax highlighting.
  <img src="https://i.stack.imgur.com/fpTEl.png" alt="enter image description here"></p>
  
  <p>The screenshot of corresponding correct syntax highlighting:
  <img src="https://i.stack.imgur.com/6h5tH.png" alt="enter image description here"></p>
  
  <p>The new (wrong) VIM version is: VIM - Vi IMproved 7.3 (2010 Aug 15, compiled May 4 2012 04:21:49)  Included patches: 1-429</p>
  
  <p>The old (correct) VIM version is: VIM - Vi IMproved 7.2 (2008 Aug 9, compiled Sep 21 2009 11:21:42) Included patches: 1-245</p>