e>if_*</code> and the <code>warn_*</code>, <code>stop_*</code> and <code>message_*</code> seen before. They take a list as first argument, and a predicate. They test if any, all or none of the elements validate the predicate.</p>
<div class="sourceCode" id="cb31"><pre class="sourceCode r"><code class="sourceCode r"><a class="sourceLine" id="cb31-1" title="1"><span class="kw"><a href="reference/messagehandler.html">stop_if_any</a></span>(iris, is.factor, <span class="dt">msg =</span> <span class="st">"Factor