de> at environment creation time.</p></div></div><div class="odoc-spec"><div class="spec value" id="val-compare_subs_constraints" class="anchored"><a href="#val-compare_subs_constraints" class="anchor"></a><code><span><span class="keyword">val</span> compare_subs_constraints : 
  <span>pre_conds:<a href="../Constraint/index.html#type-t">Constr.t</a> <span class="arrow">&#45;&gt;</span></span>
  <span>post_conds:<a href="../Constraint/index.html#type-t">Constr.t</a> <span class="arrow">&#45;&gt;</span></span