SwiftUI: quick and dirty nested ForEach debugger

.swift

import SwiftUI

struct Location: Equatable {
	var file: String
	var line: UInt
}
private struct ForEachKey: EnvironmentKey {
	static var defaultValue: [Location] = []
}
private extension EnvironmentValues {
	var forEachLocations: [Location] {
		get { self[ForEachKey.self] }
		set { self[ForEachKey.self] = newValue }
	}
}

struct _ForEach<Data: RandomAccessCollection, ID, Content: View>: View where ID == Data.Element.ID, Data.Element: Identifiable {
	@Environment(\.forEachLocations) private var forEachLocations

	private let location: Location
	private var data: Data
	private var content: (Data.Element) -> Content

	init(file: StaticString = #file, line: UInt = #line, _ data: Data, @ViewBuilder content: @escaping (Data.Element) -> Content) {
		self.data = data
		self.content = content
		self.location = .init(file: "\(file)", line: line)
	}

	var body: some View {
		ForEach(data) { element in
			content(element)
				.environment(\.forEachLocations, forEachLocations + [location])
		}
		.onAppear {
			if !forEachLocations.isEmpty {
				print("⚠️Nested ForEach @ \(location.file):\(location.line)")
				for location in forEachLocations.reversed() {
					print("Contained in: \(location.file):\(location.line)")
				}
			}
		}
	}
}