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type type_of =
  | Integer  (** A numeric value *)
  | Bool  (** A boolean, not a real type *)
  | String  (** String value *)
  | NumericString  (** String containing a numeric value *)
[@@deriving show, eq]

module Expression : sig
  type t = Variable of type_of | Raw of type_of [@@deriving show, eq]
  type t' = t

  include Qsp_syntax.S.Expression with type t := t and type t' := t'

  val ident :
    ctx:Qsp_syntax.S.extract_context ->
    (Qsp_syntax.S.pos, 'any) Qsp_syntax.S.variable ->
    t

  val get_type : t -> type_of
end

val expression_id : Expression.t Type.Id.t
(** Type identifier for the expression in this module *)

val ex : Qsp_syntax.Identifier.t