Issue Description:

I was working on a project and received this bug message while trying to compile the file.

"Failed to produce diagnostic for expression; please submit a bug report (https://swift.org/contributing/#reporting-bugs) and include the project."

//

// ContentView.swift

// M29A2

//

// Created by Andy Klien on 2022-01-23.

//

import SwiftUI

struct ContentView: View {

@State **var** userText = ""

@State **var** capMode = 1



**var** body: **some** View {

    

    VStack{

        

        **if** capMode == 1

{ Text(userText.uppercased()) .font(.largeTitle) }

else if capMode == 2

{ Text(userText.capitalized()) .font(.largeTitle) }

else if capMode == 3

{ Text(userText.lowercased()) .font(.largeTitle) }

        Text(userText)

            .font(.largeTitle)

            .foregroundColor(.blue)

            .bold()

            .padding()

        

        TextField("Enter Text Here...", text: $userText)

            .padding()

            .background(.gray)

            .cornerRadius(50)

        

        HStack{

            Button(action:

{ capMode = 1 }

) {

                RoundedButton(title: "Caps", colour: .blue)

                

                Button(action:

{ capMode = 2 }

) {

                    RoundedButton(title: "First Letter", colour: .green)

                    

                    Button(action:

{ capMode = 3 }

)

{ RoundedButton(title: "Lowercase", colour: .red) }

                }

            }

            .padding()

        }

    }

}





**struct** RoundedButton: View{

    

    **var** title: String

    **var** colour: Color

    

    **var** body: **some** View

{ Text(title) .padding(10) .frame(maxWidth:.infinity) .background(colour) .font(.body) .cornerRadius(10) .foregroundColor(.white) }

}



**struct** ContentView_Previews: PreviewProvider {

    **static** **var** previews: **some** View

{ ContentView() }

}

}