de>#if</code> or <code>#elif</code>
preprocessing directive, or the use of the defined unary operator does not match
one of the two specified forms prior to macro replacement (6.10.1).</td>
<td>no</td>
</tr>

<tr><td>
&ndash; The <code>#include</code> preprocessing directive that results after expansion does not match
one of the two header name forms (6.10.2).</td>
<td>no</td>
</tr>

<tr><td>
&ndash; The character sequence in an <code>#include</code> preprocessing directive does not start with a
letter (6.1