span></span> <span class="symbol"><span class="name">as</span><span class="tparams">[<span name="E">E</span>]</span><span class="params">(<span class="implicit">implicit </span><span name="l">l: <a href="ExprLang.html" name="provingground.translation.ExprLang" id="provingground.translation.ExprLang" class="extype">ExprLang</a>[<span name="provingground.translation.FreeExpr.FreePi.as.E" class="extype">E</span>]</span>)</span><span class="result">: <span name="scala.Option" class="extype">Option</span>[<span 