span class="identifier">std</span><span class="special">::</span><span class="identifier">boolalpha</span><span class="special">;</span>
	<span class="comment">// works fine for contains&lt;good&gt;</span>
	<span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span><span class="special">&lt;&lt;</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">has_modulus_assign</span><span class="special">&lt;</span> <span class="i