swift-mirror/validation-test/Sema/SwiftUI/too_complex_source_location.swift

// RUN: %target-typecheck-verify-swift -target %target-cpu-apple-macosx10.15 -swift-version 5
// REQUIRES: objc_interop

// https://forums.swift.org/t/roadmap-for-improving-the-type-checker/82952/9
//
// The purpose of the test is to ensure the diagnostic points at the right statement in
// the function body, and not the function declaration itself.
//
// Ideally, we would produce a useful diagnostic here. Once we are able to do that, we
// will need to devise a new test which complains with 'reasonable time' to ensure the
// source location remains correct.

import SwiftUI

struct ContentView: View {
    @State var selection = ""

    @State var a: Int?
    @State var b: Int?
    @State var c: Int?

    var body: some View {
        ScrollView {
            VStack {
                Picker(selection: $selection) {
                    ForEach(["a", "b", "c"], id: \.self) {
                        Text($0)  // expected-error {{reasonable time}}
                            .foregroundStyl(.red) // Typo is here
                    }
                } label: {
                }
                .pickerStyle(.segmented)
            }
            .padding(.horizontal)
        }
        .onChange(of: a) { oldValue, newValue in
        }
        .onChange(of: b) { oldValue, newValue in
        }
        .onChange(of: c) { oldValue, newValue in
        }
    }
}