c.t</a> <span class="arrow">&#45;&gt;</span></span>
  <a href="#type-invariant_map">invariant_map</a></span></code></div><div class="spec-doc"><p>compute and return invariant map for the given procedure starting from <code>initial</code></p></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-extract_post"><a href="#val-extract_post" class="anchor"></a><code><span><span class="keyword">val</span> extract_post : 
  <span><a href="argument-1-TransferFunctions/CFG/Node/index.html#type-id