title: What is the "*debug* buffer" in Kakoune?
body: <p>I'm just starting with the <a href="https://github.com/mawww/kakoune" rel="noreferrer">Kakoune</a> editor and somehow I was shown the message <code>error during startup, see *debug* buffer for details</code> when I loaded a file with <code>kak</code>.</p>
  
  <p>I don't know if I'm too stupid to ask this, but I don't know how do I "see <em>debug</em> buffer". The <code>:debug</code> option seems to be there to write something to the debug buffer, not read it.</p>