a warning like this:
          </p>
<pre class="programlisting">Message from thrown exception was:
   Error in function boost::math::find_scale&lt;Dist, Policy&gt;(complement(double, double, double, Policy)):
   Computed scale (-0.48043523852179076) is &lt;= 0! Was the complement intended?
</pre>
<p>
            The default error handling policy is to throw an exception with this
            message, but if you chose a policy to ignore the error, the (impossible)
            negative scale is quietly return