n><span class="special">::</span><span class="identifier">karma</span></code>,
            and <code class="computeroutput"><span class="identifier">spirit</span><span class="special">::</span><span class="identifier">lex</span></code> (if they are supported by the corresponding
            sub-library).
          </li>
<li class="listitem">
            The terminal placeholders <code class="computeroutput"><span class="identifier">char_</span></code>
            and <code class="computeroutput"><span class