"Failed to produce a diagnostic for expression; please file a bug report" error.

Question

Why am I getting this error? There's another post similar to this, but it doesn't have any answers.

Code Block import SwiftUI
struct ContentView: View {
    
    @State var clicked = 0
    
    var numberValue = [1: "won", 9: "Nein!", 69: "nice.", 123: "321", 666: "ILLUMINATI", 6969: "very nice."]
    
    func addOne() {
        clicked += 1
        print(clicked)
    }
    var body: some View {
        VStack{
            Text("Clicker: The Game")
                .font(.largeTitle)
                .fontWeight(.bold)
                .multilineTextAlignment(.center)
                .offset(y: -225)
            
            Text(numberValue[self.clicked] ?? String(self.clicked))
                .font(.system(size: 69))
                .offset(y: -125)
            
            Button(action: addOne) {
            Text("Tap me!")
                .offset(y: -10)
                .font(.system(size: 30))
                .background(RoundedRectangle(cornerRadius: CGFloat, style: RoundedCornerStyle = .circular))
                
        }
            
        }
    }
}
struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}

11k

Posted by

TurtleLover

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Answer 1

The line 61 of your code has a severe syntax error.

Code Block                 .background(RoundedRectangle(cornerRadius: CGFloat, style: RoundedCornerStyle = .circular))

It should be something like this:

Code Block                     .background(RoundedRectangle(cornerRadius: 10, style: RoundedCornerStyle.circular))

Swift compiler should generate the right diagnostics pointing the line causing the issue. You should better send a bug report using the Feedback Assistant.
But, anyway, the current Swift compiler (you should better include the info of the Xcode version) is not good at generating proper diagnostics in ViewBuilder. You may need to comment-out/code-in each parts one by one and find which part of your code is causing this issue.

Posted by

OOPer

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Answer 2

The line 61 of your code has a severe syntax error.

Code Block                 .background(RoundedRectangle(cornerRadius: CGFloat, style: RoundedCornerStyle = .circular))

It should be something like this:

Code Block                     .background(RoundedRectangle(cornerRadius: 10, style: RoundedCornerStyle.circular))

Swift compiler should generate the right diagnostics pointing the line causing the issue. You should better send a bug report using the Feedback Assistant.
But, anyway, the current Swift compiler (you should better include the info of the Xcode version) is not good at generating proper diagnostics in ViewBuilder. You may need to comment-out/code-in each parts one by one and find which part of your code is causing this issue.

Posted by

OOPer

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Answer 3

I am also getting the same issue but have not been able to find a solution online or through GPT.

It is being flagged on line 7 in the below code "var body: some View {" Failed to produce diagnostic for expression; please submit a bug report (https://swift.org/contributing/#reporting-bugs) and include the project

Full code:

import SwiftUI

struct TermDetailView: View {
    let term: Term
    @EnvironmentObject var favouriteTermsData: FavouriteTermsData

    var body: some View {
        ScrollView {
            VStack(alignment: .leading, spacing: 16) {
                HStack {
                    Text(term.title)
                        .font(.largeTitle)
                        .fontWeight(.bold)

                    Spacer()

                    Button(action: {
                        favouriteTermsData.toggleFavourite(term.id)
                    }) {
                        Image(systemName: favouriteTermsData.isFavourite(term.id) ? "star.fill" : "star")
                            .font(.title2)
                            .foregroundColor(.yellow)
                    }
                }

                Text(term.definition)
                    .font(.body)

                if let example = term.example {
                    VStack(alignment: .leading, spacing: 12) {
                        Text("Example:")
                            .font(.title2)
                            .fontWeight(.bold)

                        Text(example)
                            .font(.body)
                    }
                }
            }
            .padding()
            .navigationBarTitleDisplayMode(.inline)
        }
    }
}

Posted by

bmoore

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Answer 4

@bmoore you should start a new thread for this new question.

And provide some needed info, with definition of

Term
FavouriteTermsData

Apparently, problem comes from FavouriteTermsData, probably either toggleFavourite or isFavourite

In addition, you must set

            .environmentObject(favouriteTermsData)

Where do you do it ?

I rebuilt an example based on your code:

struct Term {
    var id: UUID = UUID()
    var title: String = "title"
    var definition: String = "definition"
    var example: String = "example"
}

class FavouriteTermsData: ObservableObject {
    @Published var data: Bool = false
    
    func toggleFavourite(_ id: UUID) {
        self.data.toggle()
    }
    
    func isFavourite(_ id: UUID) -> Bool {
        self.data
    }
}

struct ContentView: View {  
    @StateObject var favouriteTermsData = FavouriteTermsData()
    
    var body: some View {
        TermDetailView()
            .environmentObject(favouriteTermsData)
    }
}

struct TermDetailView: View {
    let term: Term = Term()
    @EnvironmentObject var favouriteTermsData: FavouriteTermsData

    var body: some View {
        ScrollView {
            VStack(alignment: .leading, spacing: 16) {
                HStack {
                    Text(term.title)
                        .font(.largeTitle)
                        .fontWeight(.bold)

                    Spacer()

                    Button(action: {
                        favouriteTermsData.toggleFavourite(term.id)
                    }) {
                        Image(systemName: favouriteTermsData.isFavourite(term.id) ? "star.fill" : "star")
                            .font(.title2)
                            .foregroundColor(favouriteTermsData.isFavourite(term.id) ? .yellow : .green)
                    }
                }

                Text(term.definition)
                    .font(.body)

                if let example = term.example {
                    VStack(alignment: .leading, spacing: 12) {
                        Text("Example:")
                            .font(.title2)
                            .fontWeight(.bold)

                        Text(example)
                            .font(.body)
                    }
                }
            }
            .environmentObject(favouriteTermsData)      &#x2F;&#x2F; ##
            .padding()
            .navigationBarTitleDisplayMode(.inline)
        }
    }
}

Posted by

Claude31

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"Failed to produce a diagnostic for expression; please file a bug report" error.

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