rovingground.translation.Translator.Empty.O" class="extype">O</span>] to <span name="scala.Predef.any2stringadd" class="extype">any2stringadd</span>[<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>]]</h3></div><div name="scala.Predef.StringFormat" class="convers