protocol SettingsSelectable: Hashable {
    var display: String { get }
}
 
extension SettingsSelectable {
    func hash(into hasher: inout Hasher) {
        hasher.combine(display)
    }
}
 
enum PlaybackSpeed: Int, SettingsSelectable {
    case half
    case standard
    case onePointFive
    case double
    
    var display: String {
        switch self {
        case .half:
            return "0.5x"
        case .standard:
            return "1.0x"
        case .onePointFive:
            return "1.5x"
        case .double:
            return "2.0x"
        }
    }
}
 

❯ swiftc demo.swift [13:06:57]
Swift.RawRepresentable:2:27: warning: 'Hashable.hashValue' is deprecated as a protocol requirement; conform type 'PlaybackSpeed' to 'Hashable' by implementing 'hash(into:)' instead
 @inlinable public var hashValue: Int { get }