Section Properties.
Implicit Types x y : TVar.
Implicit Types xs ys : list TVar.
(* ---------------------------------------------------------------------- *)
(** **** Abstract properties of ok *)
(* ---------------------------------------------------------------------- *)
(** **** Properties of binds *)
(* ---------------------------------------------------------------------- *)
(** **** Properties of all_binds *)

(** All_Binds and binds. *)
Theorem all_binds_binds : forall A x (v : A) (E : gen_env A),
(x ∶ v) ⊏ E ->
x ∹ v ⋲ E.