"line"><a name="l00038"></a><span class="lineno">   38</span>&#160;            &gt;::value</div><div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;        &gt;::type* <span class="comment">/*dummy*/</span> = <span class="keyword">nullptr</span>)</div><div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;    {</div><div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;        io_error(<span class="stringliteral">&quot;Data cannot be c