# Module Std_internal.Int64

    module Int64: Core_int64

    include Int_intf.S

    val of_int : int -> t

    val to_int : t -> int option

    val of_float : float -> t

    val to_float : t -> float

    val of_int32 : int32 -> t

    val of_nativeint : nativeint -> t

    val bits_of_float : float -> t

    val float_of_bits : t -> float

    val to_int32 : t -> int32 option

    val to_nativeint : t -> nativeint option

    val of_int64 : t -> t