ame, parentenv, handler)</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> [46] main_function(x = "a")</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> [47] my_internal_function(x, y)</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> [48] stop_up("Argument 'x' must be numeric but currently isn't."): </span>
<span class="r-out co"><span class="r-pr">#&gt;</span> Argument 'x' must be numeric but currently isn't.</span>
<span class="r-in"><span><span class="co"># =&gt; the 