This code compiles fine on Xcode 12.5.1 and 13

private func maskOtherLocalAccount(number: String?) -> String {
    guard let number = number, number.count > 5 else { return number ?? "-"}
}

But on Xcode 12.4, it gives this compile error:

Variable declared in 'guard' condition is not usable in its body

Though the fix is quite easy, I find it really strange that it works on Xcode 12.5.1 and not on 12.4. Can someone point to an official changelog documenting this change?

CodePudding user response：

This is reported by SR-8669:

If you attempt to use a guard statement to declare a variable that shadows an existing variable, a compiler error prevents you from accessing the existing variable in the body of the guard.

This is already marked resolved almost a whole year ago, which matches the release date of Xcode 12.5.