Here is my WatchOS app test. I've only tested in the simulator in 11.3.1 (Deployment Target 6.1) and 11.4 beta (Deployment Target 6.2)import SwiftUIprivate final class Foo: ObservableObject { @Published var bar = Color.green}struct FilledButton: ButtonStyle { // this do not work, runtime error when this is referenced, see below, works fine with ViewModifier @EnvironmentObject fileprivate var foo: Foo func makeBody(configuration: Configuration) -> some View { configuration.label .foregroundColor(configuration.isPressed ? .red : .white) .padding() .background(Color.accentColor) .padding() // Thread 1: Fatal error: No ObservableObject of type Foo found. A View.environmentObject(_:) for Foo may be missing as an ancestor of this view. .background(self.foo.bar) // <==== runtime error anytime you reference this .cornerRadius(8) }}struct ContentView: View { var body: some View { AppView() .accentColor(.orange) .buttonStyle(FilledButton()) .environmentObject(Foo()) // <=== @EnvironmentObject is set here, this works with ViewModifier, not ButtonStyle }}struct AppView: View { var body: some View { VStack(spacing: 5) { Text("Hi, I'm Paul!") Keypad() } }}struct Keypad: View { var body: some View { VStack(spacing: 5) { Button(action: {}) { Text("One") } Button(action: {}) { Text("Two") } } }}struct ContentView_Previews: PreviewProvider { static var previews: some View { ContentView() }}

I'm not getting any deprecation warning now when I compile my code with known deprecation. How to enable deprecation warning? I want to get rid of all deprecated calls.