span>
<span class="r-in"><span><span class="co"># Same with the warning =&gt; much clearer with warn_up</span></span></span>
<span class="r-in"><span><span class="fu">main_function</span><span class="op">(</span><span class="fl">1</span>, <span class="fl">1</span><span class="op">:</span><span class="fl">2</span><span class="op">)</span></span></span>
<span class="r-wrn co"><span class="r-pr">#&gt;</span> <span class="warning">Warning: </span>In main_function(1, 1:2):</span>
<span class="r-wrn co"><span cla