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

(** Eq implements equivalence over bindings. *)
Theorem eq_binds : forall A x (v : A) (E F : gen_env A),
E ≍ F ->
binds x v E ->
binds x v F.