title: Mercurial: Easy way to see changes from last commit
body: <p>In Mercurial, I can see my current (uncommitted) changes by running</p>
  
  <pre><code>$ hg diff
  </code></pre>
  
  <p>Fine. But after commit, I sometimes want to see this diff again (i.e., the diff of the <em>last changeset</em>). I know I can achieve this by </p>
  
  <pre><code>$ hg log -l 1
  changeset:    1234
  tag ...
  
  $ hg diff -c 1234
  </code></pre>
  
  <p>I'm looking for a way to do this in one line.</p>