toc_title"><a href="Callback.html">Callback</a></div><ul></ul></nav></header>
<code class="code"><span class="keyword">sig</span><br>
&nbsp;&nbsp;<span class="keyword">val</span>&nbsp;register&nbsp;:&nbsp;string&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;<span class="keywordsign">'</span>a&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;unit<br>
&nbsp;&nbsp;<span class="keyword">val</span>&nbsp;register_exception&nbsp;:&nbsp;string&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;exn&nbsp;<span class