i class="listitem"><p>
     <code class="function">errmsg_internal(const char *msg, ...)</code> is the same as
     <code class="function">errmsg</code>, except that the message string will not be
     translated nor included in the internationalization message dictionary.
     This should be used for <span class="quote">“<span class="quote">cannot happen</span>”</span> cases that are probably
     not worth expending translation effort on.
    </p></li><li class="listitem"><p>
     <code class="functio