Bit_field.Make
Create a new bitfield type
Generative type of bitfields. Each instantiation of the functor should create a new, incompatible type
val empty : t
Empty bitfields (all bits 0).
val mk_field : unit -> field
Make a new field.
Prevent new fields from being added. From now on, creating a field will raise Frozen.
val unsafe_of_int : int -> t