title: unified diff: text after second @@ of a hunk
body: <p>I could not find a specification for the unified diff format on the web. Often one sees text from the diffed files after the second <code>@@</code> of a hunk, like this:</p>
  
  <pre><code>@@ -209,4 +196,4 @@ cleanup:
      _TEMPLATE(T, vec) (X);
   }
  
  -#endif
  \ No newline at end of file
  +#endif
  </code></pre>
  
  <p>Does the text after the second <code>@@</code> matter at all?</p>