let rec export_tau fmt = function
| Formula.Integer -> Format.pp_print_string fmt "int"
| Formula.Real -> Format.pp_print_string fmt "real"
| Formula.Boolean -> Format.pp_print_string fmt "bool"
| Formula.Pointer t -> export_tau fmt t
| Formula.Record c -> Format.fprintf fmt "%s" c.Cil_types.cname
| Formula.Array arr ->
let t = L.tau_of_ctype_logic arr.Ctypes.arr_element in
Format.fprintf fmt "%a farray" export_tau t
| Formula.Set te ->
Format.fprintf fmt "%a set" export_tau te
| Formula.ADT(s,[]) -> Format.pp_print_string fmt s
| Formula.ADT(s,[t]) -> Format.fprintf fmt "%a %s" export_tau t s
| Formula.ADT(s,t::ts) ->
Format.fprintf fmt "@[(%a" export_tau t ;
List.iter (fun t -> Format.fprintf fmt ",@,%a" export_tau t) ts ;
Format.fprintf fmt ") %s@]" s