dawn-cmake/test/shader_io/fragment_output_builtins_struct.wgsl

struct FragmentOutputs {
  @builtin(frag_depth) frag_depth : f32;
  @builtin(sample_mask) sample_mask : u32;
};

@stage(fragment)
fn main() -> FragmentOutputs {
  return FragmentOutputs(1.0, 1u);
}