`sig
type 'a uref = 'a BatUref.uref
type 'a t = 'a uref
val uref : 'a -> 'a uref
val uget : 'a uref -> 'a
val uset : 'a uref -> 'a -> unit
val unite : ?sel:('a -> 'a -> 'a) -> 'a uref -> 'a uref -> unit
val equal : 'a uref -> 'a uref -> bool
val print :
('a BatInnerIO.output -> 'b -> unit) ->
'a BatInnerIO.output -> 'b uref -> unit
val uref_printer : 'a BatValue_printer.t -> 'a uref BatValue_printer.t
val t_printer : 'a BatValue_printer.t -> 'a t BatValue_printer.t
end`