/span> <span class="special">&lt;&lt;</span> <span class="identifier">thrown</span>
          <span class="special">&lt;&lt;</span> <span class="string">"'"</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
</pre>
<p>
        </p>
<p>
          <a name="wait_all_until_error_source"></a>Naturally this complicates the
          API for <code class="computeroutput"><span class="identi