  <a href="#type-comparator">comparator</a> * <a href="#type-comparator">comparator</a></span></code></div><div class="spec-doc"><p>Compare two subroutines by composition based on the postcondition specified from the smtlib2 string.</p><p>Give two subroutines and environments, return a postcondition and hypothesis that, when passed to <code>compare_subs</code>, will generate a precondition which is provable only if (modulo soundness bugs) the postcondition from the smtlib2 string is satisfiable, given the h