import SwiftUI

struct User: Identifiable {
    let id = UUID()
    var name: String
    var isContacted = false
}

final class Model: ObservableObject {
    @Published var users: [User]

    init(_ users: [User]) {
        self.users = users
    }
}

struct ContentView: View {
    @EnvironmentObject private var model: Model

    var body: some View {
        List($model.users) { $user in
            itemView(user: $user)     // <=== !!! very odd, no compile error here, but error over at the func definition!
            itemView($user: $user)    // change the previous line to this the error below goes away
        }

    }

    // there is nothing wrong with this, but if the call site is wrong, compiler error here
    // this erroneous error message makes to look like the func definition here is wrong, but it's fine 
    func itemView(@Binding user: User) -> some View { // <=== !!! why compile error here? => Property type 'Binding<User>' does not match 'wrappedValue' type 'User'
                                                      // fix the call site, this error goes away
        EmptyView()
    }
}