Fixpoint fold_right_and P0 (l: list Prop) : Prop :=
match l with
| nil => P0
| b::r => b  /\ fold_right_and P0 r
end.
Fixpoint fold_right_and_True (l: list Prop) : Prop :=
match l with
| nil => True
| b :: nil => b
| b::r => b /\ fold_right_and_True r
end.
Definition fold_right_PROP_SEP (l1: list Prop) (l2: list mpred) : mpred :=
match l1 with
| nil => fold_right_sepcon l2
| l => !! (fold_right_and_True l) && fold_right_sepcon l2
end.

Lemma typed_true_isptr:
forall t, match t with Tpointer _ _ => True | Tarray _ _ _ => True | Tfunction _ _ _ => True | _ => False end ->
typed_true t = isptr.