<commit_before>import Foundation

struct Null {}

extension Null : PackProtocol {

    struct Constants {
        static let byteMarker: Byte = 0xC0
    }

    func pack() throws -> [Byte] {
        return [ Constants.byteMarker ]
    }

    static func unpack(_ bytes: ArraySlice<Byte>) throws -> Null {
        if bytes.count != 1 {
            throw UnpackError.incorrectNumberOfBytes
        }

        if bytes[bytes.startIndex] != Constants.byteMarker {
            throw UnpackError.unexpectedByteMarker<commit_msg>Make Null a public value<commit_after>import Foundation

public struct Null {}

extension Null : PackProtocol {

    struct Constants {
        static let byteMarker: Byte = 0xC0
    }

    public func pack() throws -> [Byte] {
        return [ Constants.byteMarker ]
    }

    public static func unpack(_ bytes: ArraySlice<Byte>) throws -> Null {
        if bytes.count != 1 {
            throw UnpackError.incorrectNumberOfBytes
        }

        if bytes[bytes.startIndex] != Constants.byteMarker {
            throw UnpackError.unexpectedByteMarker
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