<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.induction.NotFunc" id="provingground.induction.NotFunc" class="extype">NotFunc</a>) =&gt; <span name="scala.Boolean" class="extype">Boolean</span></span>)</span><span class="result">: <a href="" name="provingground.induction.NotFunc" id="provingground.induction.NotFunc" class="extype">NotFunc</a></span></s