title: In Mercurial Is it "safe" to pull when a mq patch is applied?
body: <p>The <a href="http://golang.org/doc/codereview_with_mq.html" rel="nofollow">go programming language has a page on code reviews</a> using mq and it states:  "Since pulling, pushing, updating and committing while mq patches are applied can damage your repository".</p>
  
  <p>I understand why pushing or updating could be an issue, but is pulling an issue?</p>
  
  <p>If you have mq patches applied and you pull will your repository be damaged?</p>