><span class="k">threaded_once</span>(<span class="o">@</span>callable) <span class="o">-</span> one
<span class="k">threaded_once</span>(<span class="o">@</span>callable, <span class="o">--</span>nonvar) <span class="o">-</span> one
</pre></div>
</div>
</section>
<section id="errors">
<h2>Errors<a class="headerlink" href="#errors" title="Link to this heading"></a></h2>
<div class="line-block">
<div class="line">Goal is a variable:</div>
<div class="line-block">
<div class="line"><code class="docutils li