a> <span class="keyword">with</span> <span><span class="keyword">type</span> <a href="../../../IStdlib/PrettyPrintable/module-type-PrintableType/index.html#type-t">t</a> := <a href="#type-t">t</a></span></span></code></summary></details></div><div class="odoc-spec"><div class="spec value anchored" id="val-pp_key"><a href="#val-pp_key" class="anchor"></a><code><span><span class="keyword">val</span> pp_key : <span><a href="../../../IStdlib/PrettyPrintable/index.html">IStdlib.PrettyPrintable</a>.F.formatter <s