pan><span class="special">&gt;</span></code>
            where <code class="computeroutput"><span class="identifier">b</span></code> is a <code class="computeroutput"><span class="keyword">bool</span></code> value and <code class="computeroutput"><span class="identifier">F</span></code>
            is a type meeting the requirements of <a class="link" href="Fields.html" title="Fields"><span class="emphasis"><em>Fields</em></span></a>.
          </li>
</ul></div>
<div class="table">
<a name="beast.concepts.B