/span> <span class="identifier">v</span><span class="special">;</span>                <span class="comment">// empty container</span>
<span class="identifier">test_generator_attr</span><span class="special">(</span><span class="string">""</span><span class="special">,</span> <span class="special">-</span><span class="identifier">buffer</span><span class="special">[</span><span class="char">'['</span> <span class="special">&lt;&lt;</span> <span class="special">+</span><span class="identifier">double_</span> 