an class="keyword">exception</span>&nbsp;<span class="constructor">Error</span>&nbsp;<span class="keyword">of</span>&nbsp;<span class="constructor">Syntaxerr</span>.error<br>
&nbsp;&nbsp;<span class="keyword">exception</span>&nbsp;<span class="constructor">Escape_error</span><br>
&nbsp;&nbsp;<span class="keyword">val</span>&nbsp;report_error&nbsp;:&nbsp;<span class="constructor">Format</span>.formatter&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;<span class="constructor">Syntaxerr</span>.error&nbsp;<sp