Enum case alias

[p-x9]

enum Difficulty {
    @Alias("beginner")
    case easy

    @Alias("normal")
    case medium

    @Alias("challenge")
    case hard

    @Alias("extreme")
    case expert

    @Alias("ultimate")
    case master(level: Int)
}

At this time, the macro is expanded as follows.

enum Difficulty {
    case easy
    case medium
    case hard
    case expert
    case master

    static let beginner: Self = .easy
    static let normal: Self = .medium
    static let challenge: Self = .hard
    static let extreme: Self = .expert
    static func ultimate(level: Int) -> Self {
        .master(level)
    }
}