ViewBuilderConformingView.swift

import SwiftUI

protocol MyView {
    associatedtype Body : View
    // Apple adds @ViewBuilder here in the View protocol
    var body: Self.Body { get }
}

struct ConformingView: MyView  {
    // @ViewBuilder needed because multiple values are returned
    @ViewBuilder
    var body: some View {
        Text("One")
        Text("Two")
        Text("Three")
    }
    
    // @ViewBuilder not needed because type is inferred to be 
    // Group<TupleView<(Text, Text, Text)>>
    var oneConcreteType: some View {
        Group {
            Text("One")
            Text("Two")
            Text("Three")
        }
    }
}