</span> <span class="symbol"><span class="name">recOpt</span><span class="tparams">[<span name="C">C &lt;: <a href="../HoTT$$Term.html" name="provingground.HoTT.Term" id="provingground.HoTT.Term" class="extype">Term</a> with <a href="../HoTT$$Subs.html" name="provingground.HoTT.Subs" id="provingground.HoTT.Subs" class="extype">Subs</a>[<span name="provingground.induction.ExstInducStrucs.IndConsSeqExst.recOpt.C" class="extype">C</span>]</span>]</span><span class="params">(<span name="dom">dom: <a href="../Ho