e="gt4s: $colon$colon">::</span><span class="tparams">[<span name="Z">Z</span>, <span name="X">X</span>]</span><span class="params">(<span name="that">that: <a href="Sort.html" name="provingground.learning.Sort" id="provingground.learning.Sort" class="extype">Sort</a>[<span name="provingground.learning.SortList.::.Z" class="extype">Z</span>, <span name="provingground.learning.SortList.::.X" class="extype">X</span>]</span>)</span><span class="result">: <a href="" name="provingground.learning.SortList.Cons" i