ObservableObject With Typed Throws Closure Crashes on iOS 17

Originator:nathan.molby
Number:rdar://FB16399987 Date Originated:01/24/2025
Status:Open Resolved:
Product:SwiftUI Product Version:
Classification: Reproducible:Yes
 
Having a property inside of an ObservableObject with a type of a closure with a typed throws will crash the app on the initialization of the observable object on iOS 17. Here is an example:
```
struct ContentView: View {
    @StateObject var myDataSource = MyDataSource()
    var body: some View {
        EmptyView()
    }
}

enum MyError: Error {
    case error
}

class MyDataSource: ObservableObject {
    let signUp: (Int) throws(MyError) -> Void = { _ in }
}
```

If you run this code on iOS 17, the app will crash.

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