><span class="type-var">'a</span> <a href="../State/index.html#type-t">State.t</a></span> <a href="argument-1-TransferFunctions/CFG/Node/IdMap/index.html#type-t">InvariantMap.t</a></span> <span class="arrow">&#45;&gt;</span></span>
  <span><span class="type-var">'a</span> option</span></span></code></div><div class="spec-doc"><p>extract the precondition for a node id from the given invariant map</p></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-extract_state"><a href="#val-extra