sig
  type t =
      Arrays
    | Chars
    | Colors
    | Consts
    | Debug
    | Finish
    | Functions
    | Glass
    | Glass_old
    | Golds
    | Logo
    | Math
    | Metals
    | Rad_def
    | Rand
    | Textures
    | Transforms
    | Screen
    | Shapes
    | Shapes2
    | Shapes_old
    | Shapesq
    | Skies
    | Stage1
    | Stars
    | Stdcam
    | Stdinc
    | Stoneold
    | Stones
    | Stones1
    | Stones2
    | Strings
    | Sunpos
    | Woodmaps
    | Woods
  val to_string : inc:Povray.Inc_file.t -> string
  val of_string : inc:string -> Povray.Inc_file.t
end