rn invariant map for the given procedure starting from <code>initial</code></p></dd></dl><dl><dt class="spec value" id="val-extract_post"><a href="#val-extract_post" class="anchor"></a><code><span class="keyword">val</span> extract_post : <a href="index.html#module-InvariantMap">InvariantMap</a>.key <span>&#45;&gt;</span> <span><span><span class="type-var">'a</span> <a href="../../../AbstractInterpreter/State/index.html#type-t">AbstractInterpreter.State.t</a></span> <a href="index.html#module-InvariantMap">