ss="kind">def</span></span> <span class="symbol"><span class="name" title="gt4s: $plus$plus">++</span><span class="params">(<span name="that">that: <a href="Context.html" name="provingground.Context" id="provingground.Context" class="extype">Context</a></span>)</span><span class="result">: <a href="Context.html" name="provingground.Context" id="provingground.Context" class="extype">Context</a></span></span><div class="fullcomment"><dl class="attributes block"><dt>Definition Classes</dt><dd><a href="Context.