</span></span> <span>&#45;&gt;</span> <span><span><span>(<span class="type-var">'a</span>, <span class="type-var">'b</span>)</span> <a href="index.html#type-structured">structured</a></span> <a href="index.html#type-typ">typ</a></span> <span>&#45;&gt;</span> <span><span>(<span class="type-var">'a</span>, <span class="type-var">'b</span>)</span> <a href="index.html#type-structured">structured</a></span></code></dt><dt class="spec value" id="val-setf"><a href="#val-setf" class="anchor"></a><code><span class