ala.Predef.ArrowAssoc.-&gt;.B" class="extype">B</span></span>)</span><span class="result">: (<a href="" name="provingground.translation.Translator.Empty" id="provingground.translation.Translator.Empty" class="extype">Empty</a>[<span name="provingground.translation.Translator.Empty.I" class="extype">I</span>, <span name="provingground.translation.Translator.Empty.O" class="extype">O</span>], <span name="scala.Predef.ArrowAssoc.-&gt;.B" class="extype">B</span>)</span></span><div class="fullcomment"><dl class=