 href="../../../../../IStdlib/IContainer/index.html#type-singleton_or_more">IStdlib.IContainer.singleton_or_more</a></span></span></code></div></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><span class="xref-unresolved">IStdlib__PrettyPrintable</span>.F.formatter <span class="arrow">&#45;&gt;</span></span> <span><a href="#type-key">key</a> <span class="arrow">&#45;&gt;</span></