Notation orb_b_false := orb_false_r (only parsing).
Notation orb_false_b := orb_false_l (only parsing).
(** Complementation *)

(* Specifications: *)
Lemma orb_negb_r : forall b:bool, b || negb b = true.
#[global]
Hint Resolve orb_negb_r: bool.
Lemma orb_negb_l : forall b:bool, negb b || b = true.
Notation orb_neg_b := orb_negb_r (only parsing).