  <span class="comment">// We'll just re-use io_error since std::istream has no error_code interface.</span>
                    <span class="identifier">ec</span> <span class="special">=</span> <span class="identifier">make_error_code</span><span class="special">(</span><span class="identifier">errc</span><span class="special">::</span><span class="identifier">io_error</span><span class="special">);</span>
                    <span class="keyword">return</span><span class="special">;</span>
               