Module VericSepLogic <: SepTheory.SepTheory.
Definition hprop := mpred.
Definition himp := derives.
Definition heq := fun p1 p2 => derives p1 p2 /\ derives p2 p1.
Definition Refl_himp := derives_refl.
Definition Trans_himp := derives_trans.
Local Notation "a ===> b" := (himp a b) (at level 60).
Local Notation "a <===> b" := (heq a b) (at level 60).
Definition emp := emp.
Definition inj := fun p => (prop p && emp).
Definition star := sepcon.
Definition ex := @exp mpred Nveric.

Lemma himp_star_frame : forall P Q R S,
P ===> Q -> R ===> S -> (star P R) ===> (star Q S).