class="dv">0</span>) {</span>
<span id="cb19-3"><a href="Intro.html#cb19-3"></a>  <span class="kw">message</span>(<span class="st">&quot;y is negative&quot;</span>)</span>
<span id="cb19-4"><a href="Intro.html#cb19-4"></a>}</span>
<span id="cb19-5"><a href="Intro.html#cb19-5"></a></span>
<span id="cb19-6"><a href="Intro.html#cb19-6"></a><span class="co"># Bad</span></span>
<span id="cb19-7"><a href="Intro.html#cb19-7"></a><span class="cf">if</span> (y <span class="op">&lt;</span><span class="st"> </span><sp