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) { $user in
            itemView($_: $user)     // <=== !!! Compiler error here: Extraneous argument label '$_:' in call
        }
    }

    func itemView(@Binding _ user: User) -> some View {
        EmptyView()
    }
}