etf" class="anchor"></a><code><span><span class="keyword">val</span> setf : <span><span><span>(<span class="type-var">'b</span>, <span class="type-var">'c</span>)</span> <a href="#type-structured">structured</a></span> <span class="arrow">&#45;&gt;</span></span> <span><span><span>(<span class="type-var">'a</span>, <span><span>(<span class="type-var">'b</span>, <span class="type-var">'c</span>)</span> <a href="#type-structured">structured</a></span>)</span> <a href="#type-field">field</a></span> <span class=