an class="st">"a"</span>), </a>
<a class="sourceLine" id="cb10-7" title="7">          <span class="dt">.e =</span> <span class="op">~</span><span class="st"> </span><span class="kw">stop</span>(.x), </a>
<a class="sourceLine" id="cb10-8" title="8">          <span class="dt">.w =</span> <span class="op">~</span><span class="st"> </span><span class="kw">warning</span>(.x))</a>
<a class="sourceLine" id="cb10-9" title="9"><span class="co"># Error in log("a") : non-numeric argument to mathematical function</span