Ltac refold_right_sepcon R :=
 match R with
 | @sepcon mpred _ _ ?R1 ?R' => let S := refold_right_sepcon R' in constr: (R1 :: S )
 | _ => constr:(R :: nil)
 end.Definition func_ptr' f v := func_ptr f v && emp.

Hint Rewrite @subst_lift4 (*@subst_lift4'*) @subst_lift4C : subst.