lt;&gt; exposes an attribute of char as well</span>
<span class="identifier">rule</span><span class="special">&lt;</span><span class="identifier">output_iterator_type</span><span class="special">,</span> <span class="keyword">char</span><span class="special">()&gt;</span> <span class="identifier">r1</span> <span class="special">=</span> <span class="identifier">char_</span><span class="special">;</span>

<span class="identifier">symbols</span><span class="special">&lt;</span><span class="keyword">char</span