title: hg command to see the changeset prior to an hg fetch
body: <p>What mercurial command can you use to see the changeset prior to changeset xyz?</p>
  
  <p>If you do <code>hg log -r :xyz</code> you see all the changesets prior to (and including) xyz - listed in ascending order. But I'd like to easily see just the prior changeset.</p>
  
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  <p>Update: Really what I'm after is this: If I do an <code>hg fetch</code>, what command can I use to see the changeset PRIOR to the the changesets that were pulled in by the fetch?  </p>
  
  <p><code>hg log -r :xyz</code> where xyz is the first changeset pulled in by the fetch works but it returns the entire list of prior changesets where I just want the most recent.</p>