 more informative and appropriate for the user. It offers a similar functionality for <code>warning</code>.</p>
    </div>

    <div id="ref-usage">
    <div class="sourceCode"><pre class="sourceCode r"><code><span><span class="fu">stop_up</span><span class="op">(</span><span class="va">...</span>, up <span class="op">=</span> <span class="fl">1</span>, msg <span class="op">=</span> <span class="cn">NULL</span>, envir <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/sys.parent.html