pan class="special">&lt;</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">&gt;(</span><span class="identifier">_3</span><span class="special">,</span> <span class="identifier">_2</span><span class="special">)</span>   <span class="comment">// iterators to error-pos, end</span>
        <span class="special">&lt;&lt;</span> <span class="identifier">val</span><span class="special">(</span><span class="string">"\""</span><span cl