y" class="anchor"></a><code><span><span class="keyword">type</span> key</span><span> = <a href="../../argument-1-RPO/TransferFunctions/CFG/Node/index.html#type-id">WTO.TransferFunctions.CFG.Node.id</a></span></code></div></div><div class="odoc-spec"><div class="spec type anchored" id="type-t"><a href="#type-t" class="anchor"></a><code><span><span class="keyword">type</span> <span>!'a t</span></span><span> = <span><span class="type-var">'a</span> <a href="../../argument-1-RPO/TransferFunctions/CFG/Node/IdMap