t">InvariantMap.t</a></span> <span>&#45;&gt;</span> <span><span class="type-var">'a</span> option</span></code></dt><dt class="spec value" id="val-extract_state"><a href="#val-extract_state" class="anchor"></a><code><span class="keyword">val</span> extract_state : <a href="TransferFunctions/CFG/Node/IdMap/index.html#type-key">InvariantMap.key</a> <span>&#45;&gt;</span> <span><span class="type-var">'a</span> <a href="TransferFunctions/CFG/Node/IdMap/index.html#type-t">InvariantMap.t</a></span> <span>&#45;&gt