e="17"><span class="co">#&gt; Warning: Test `is.character` on `a` returned a warning.</span></a>
<a class="sourceLine" id="cb27-18" title="18"></a>
<a class="sourceLine" id="cb27-19" title="19">b  &lt;-<span class="st"> </span><span class="dv">20</span></a>
<a class="sourceLine" id="cb27-20" title="20"><span class="co"># Warn if .x is not equal to 10</span></a>
<a class="sourceLine" id="cb27-21" title="21"><span class="kw"><a href="reference/messagehandler.html">warn_if_not</a></span>(<span class="dt">.x =<