struct S {
  [[align(64), location(0)]]
  f : f32;
  [[size(32), location(1), interpolate(flat)]]
  u : u32;
  [[align(128), builtin(position)]]
  v : vec4<f32>;
}

[[group(0), binding(0)]] var<storage, write> output : S;

[[stage(fragment)]]
fn frag_main(input : S) {
  let f : f32 = input.f;
  let u : u32 = input.u;
  let v : vec4<f32> = input.v;
  output = input;
}