test/shader_io/interpolate_integers.wgsl

struct Interface {
  [[location(0)]] i : i32;
  [[location(1)]] u : u32;
  [[location(2)]] vi : vec4<i32>;
  [[location(3)]] vu : vec4<u32>;
  [[builtin(position)]] pos : vec4<f32>;
};

[[stage(vertex)]]
fn vert_main() -> Interface {
  return Interface();
}

[[stage(fragment)]]
fn frag_main(inputs : Interface) -> [[location(0)]] i32 {
  return inputs.i;
}