open Syntax

(* Value *)
type v = VNum of int
       | VFun of (v -> c -> s -> t -> m -> v)
       | VEnv of v list

and c = C0
      | COp1 of e * string list * op * c
      | COp2 of op * c
      | CApp1 of e * string list * c
      | CApp2 of c
      | CPerform of c
      | CPerformShallow of c

and s = v list

and t = TNil | Trail of (v -> t -> m -> v)

and m = MNil | MCons of (c * s * t * h) * m

and h = v -> v -> c -> s -> t -> m -> v

(* to_string : v -> string *)
let rec to_string value = match value with
    VNum n -> string_of_int n
  | VFun _ -> "<VFun>"
  | VEnv _ -> "<VEnv>"

(* Value.print : v -> unit *)
let print exp =
  let str = to_string exp in
  print_string str