import SwiftUI

struct X {
  var myCoolField: Int
}

struct U: View {
  @Binding var a: Int
  var body: some View { Spacer() }
}

struct V: View {
  @State var x: X
  var body: some View {
    U(a: $x.myField) // error: value of type 'Binding<X>' has no dynamic member 'myField' using key path from root type 'X'
  }
}