de class="type">unit -&gt; bool</code></pre><div class="info ">
<code class="code"><span class="constructor">Printexc</span>.backtrace_status()</code> returns <code class="code"><span class="keyword">true</span></code> if exception
    backtraces are currently recorded, <code class="code"><span class="keyword">false</span></code> if not.<br>
<b>Since</b> 3.11.0<br>
</div>

<pre><span id="VALregister_printer"><span class="keyword">val</span> register_printer</span> : <code class="type">(exn -&gt; string opti