 id="ensuring((Defn[U])=&gt;Boolean):Defn[U]"></a> <span class="permalink"><a href="../provingground/Context$$Defn.html#ensuring(cond:A=&gt;Boolean):A" title="Permalink"><i class="material-icons"></i></a></span> <span class="modifier_kind"><span class="modifier"></span> <span class="kind">def</span></span> <span class="symbol"><span class="implicit">ensuring</span><span class="params">(<span name="cond">cond: (<a href="" name="provingground.Context.Defn" id="provingground.Context.Defn" class="extype">Def