exception TypeError

module VarMap = Mapext.Make(String)

let rec fix f s =
  let fs = f s in
  if fs = s
    then fs
    else fix f fs

let (@@) f x = f x

let print_list x l =
    Format.printf "%s: " x;
    let rec aux = function
        | [] -> ()
        | [a] -> Format.printf "%s" a
        | p::q -> Format.printf "%s, " p; aux q
    in
    Format.printf "["; aux l; Format.printf "]@.";