https://www.hackingwithswift.com/quick-start/beginners/how-to-use-switch-statements-to-check-multiple-conditions#:~:text=If%20you%20try%20changing%20.snow%20for%20.rain%2C%20you%E2%80%99ll%20see%20Swift%20complains%20loudly%3A%20once%20that%20we%E2%80%99ve%20checked%20.rain%20twice

In tutorial it is described as:

If you try changing .snow for .rain, you’ll see Swift complains loudly: once that we’ve checked .rain twice

I check the rainy case twice in switch case and it does not produce any error

enum Weather {
    case rainy
    case snowy
    case sunny
}

let test = Weather.sunny

switch test {
    case .rainy:
        print("hello")
    case .snowy:
        print("hello")
    case .sunny:
        print("hello")
    case .rainy:
        print("hello")
}

Why is that?