Can't call protocol requirements on a conforming type

Using Swift
4

I actually think this would fail to compile with any "primitive" view component:

let _ = EmptyView().body // ❌
let _ = Text("Hello, world!").body // ❌

What I'm not yet sure about is how to declare my own view component as primitive:

struct NeverView: View {
  init() { }
  var body: Never
}

let _ = NeverView().body // ✅

Here might be some clues: