i_pass instance is</span>
        <span class="comment">// still valid. If it is invalid an exception should be thrown.</span>
        <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">MultiPass</span><span class="special">&gt;</span>
        <span class="keyword">static</span> <span class="keyword">void</span> <span class="identifier">docheck</span><span class="special">(</span><span class="identifier">MultiPass</span> <spa