Module Lattices.Quadrivalent
type boolean =
| Bottom
| True
| False
| Top
include Datatype_sig.S with type t = boolean
val equal : t -> t -> bool
val compare : t -> t -> int
val pretty : Stdlib.Format.formatter -> t -> unit
val includes_or_widen : previous:t -> t -> bool * t
val includes : t -> t -> bool
val widen : previous:t -> t -> t
val is_bottom : t -> bool
val of_bools : may_be_false:bool -> may_be_true:bool -> boolean
val to_bools : boolean -> bool * bool