Definition bupd_ret_assert (Q: ret_assert): ret_assert :=
          {| RA_normal := fun rho => bupd (RA_normal Q rho);
             RA_break := fun rho => bupd (RA_break Q rho);
             RA_continue := fun rho => bupd (RA_continue Q rho);
             RA_return := fun v rho => bupd (RA_return Q v rho) |}.

Lemma proj_bupd_ret_assert: forall Q ek vl, proj_ret_assert (bupd_ret_assert Q) ek vl = fun rho => bupd (proj_ret_assert Q ek vl rho).