<code><span class="keyword">val</span> find_opt : <a href="../../IBase/CostKind/index.html#type-t">IBase.CostKind.t</a> <span>&#45;&gt;</span> <a href="index.html#type-t">t</a> <span>&#45;&gt;</span> <span><a href="BasicCostWithReason/index.html#type-t">BasicCostWithReason.t</a> option</span></code></dt><dt class="spec value" id="val-construct"><a href="#val-construct" class="anchor"></a><code><span class="keyword">val</span> construct : <span>f:<span>(<a href="../../IBase/CostKind/index.html#type-t">IBase.