val string_of_un_bool_op : Loggers.t -> Operator.un_bool_op -> string
val string_of_bin_bool_op : Loggers.t -> Operator.bin_bool_op -> string
val string_of_bin_op : Loggers.t -> Operator.bin_alg_op -> string
val string_of_un_op : Loggers.t -> Operator.un_alg_op -> string
val string_of_compare_op : Loggers.t -> Operator.compare_op -> string
