n> <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.translation.ConeRestriction" id="provingground.translation.ConeRestriction" class="extype">ConeRestriction</a>[<span name="provingground.translation.ConeRestriction.X" class="extype">X</span>, <span name="provingground.translation.ConeRestriction.Y" class="extype">Y</span>, <span name="provingground.translation.ConeRestriction.G" cla