user understands that the problem is with x</span></span></span>
<span class="r-in"><span></span></span>
<span class="r-in"><span><span class="co"># Now compare with the regular stop:</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>y <span class="op">=</span> <span class="st">"a"</span><span class="op">)</span><span class="op">)</