[swift-users] Confusing Error localizedDescription output

[Jon Shier]

Swifters:
	I have a custom error enum:

enum MyError: Error {
    
    case network(error: Error)
    case json(error: Error)
    case value(error: Error)
    
    var localizedDescription: String {
        switch self {
        case let .network(error): return error.localizedDescription
        case let .json(error): return error.localizedDescription
        case let .value(error): return error.localizedDescription
        }
    }
    
}

However, the localizedDescription output is odd to me. When the value is treated as:

Error:  po error.localizedDescription
"The operation couldn’t be completed. (MyApp.MyError error 1.)”

LocalizedError:  po (error as! LocalizedError).localizedDescription
"The operation couldn’t be completed. (MyApp.MyError error 1.)”

MyError: Error:  po (error as! MyError).localizedDescription
"JSON could not be serialized because of error:\nThe data couldn’t be read because it isn’t in the correct format."

Shouldn’t my implementation of localizedDescription take precedence in all cases here? (This is Xcode 8.3b3).



Jon