An OptionSet suitable for debugging

DebuggableOptionSet.swift

protocol DebuggableOptionSet: OptionSet, CustomDebugStringConvertible {
    static var allOptions: [Self] { get }
    static var allOptionNames: [String] { get }
}

extension DebuggableOptionSet where Self == Self.Element {
    var debugDescription: String {
        var result = ""
        for (index, element) in Self.allOptions.enumerated() {
            if contains(element) {
                let name = Self.allOptionNames[index] + "(\(element.rawValue))"
                result += result.isEmpty ? "\(name)": ", \(name)"
            }
        }
        return String(describing: type(of: self)) + "[\(result)]"
    }
}

Usage

    struct ShippingOptions: DebuggableOptionSet {
        let rawValue: Int

        static let nextDay    = ShippingOptions(rawValue: 1 << 0)
        static let secondDay  = ShippingOptions(rawValue: 1 << 1)
        static let priority   = ShippingOptions(rawValue: 1 << 2)
        static let standard   = ShippingOptions(rawValue: 1 << 3)

        static let allOptions: [ShippingOptions] = [.nextDay, .secondDay, .priority, .standard]
        static let allOptionNames: [String] = ["nextDay", "secondDay", "priority", "standard"]
    }

let options: ShippingOptions = [.priority]
print(options)
// Prints "ShippingOptions[priority(1)]"