<span><span class="op">}</span></span></span>
<span class="r-in"><span></span></span>
<span class="r-in"><span><span class="co"># Let's compare the two error messages</span></span></span>
<span class="r-in"><span><span class="co"># stop_up:</span></span></span>
<span class="r-in"><span><span class="kw"><a href="https://rdrr.io/r/base/try.html" class="external-link">try</a></span><span class="op">(</span><span class="fu">main_function</span><span class="op">(</span>x <span class="op">=</span> <span class="st