an class="keyword">if</span><span class="special">(</span><span class="identifier">it</span> <span class="special">==</span> <span class="identifier">msg</span><span class="special">.</span><span class="identifier">end</span><span class="special">())</span>
        <span class="special">{</span>
            <span class="comment">// Oops! They promised the field but failed to deliver it</span>
            <span class="identifier">os</span> <span class="special">&lt;&lt;</span> <span class="string">"Missing T