</span></span></span><div class="fullcomment"><dl class="attributes block"><dt class="implicit">Implicit</dt><dd>This member is added by an implicit conversion from <a href="" name="provingground.learning.SortList.Cons" id="provingground.learning.SortList.Cons" class="extype">Cons</a>[<span name="provingground.learning.SortList.Cons.Z" class="extype">Z</span>, <span name="provingground.learning.SortList.Cons.X" class="extype">X</span>, <span name="provingground.learning.SortList.Cons.U" class="extype">U</sp