(* ---------------------------------------------------------------------- *)
(** **** Properties of eq *)

(** Decidability of eq. *)
Theorem eq_dec : forall A (E F : gen_env A),
(forall w w' : A, { w = w' } + { ¬ w = w' }) ->
ok E -> ok F ->
{ E ≍ F } + { ¬ E ≍ F }.