 two subs by composition for an empty postcondition:</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 VCs generated by the hooks provided by the environment are satisfied. The hypothesis comparator generates a constraint which states that the stack pointer is within the bounds of the memory region we define with <code>Env.mk_env ~stack_range</co