</span>&nbsp;string&nbsp;=&nbsp;<span class="string">"caml_runtime_variant"</span><br>
&nbsp;&nbsp;<span class="keyword">external</span>&nbsp;runtime_parameters&nbsp;:&nbsp;unit&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;string&nbsp;=&nbsp;<span class="string">"caml_runtime_parameters"</span><br>
&nbsp;&nbsp;<span class="keyword">type</span>&nbsp;signal_behavior&nbsp;=<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class="constructor">Signal_default</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;<span class="keywo