dawn-cmake/test/shader_io/fragment_output_locations_struct.wgsl

struct FragmentOutputs {
  @location(0) loc0 : i32;
  @location(1) loc1 : u32;
  @location(2) loc2 : f32;
  @location(3) loc3 : vec4<f32>;
};

@stage(fragment)
fn main() -> FragmentOutputs {
  return FragmentOutputs(1, 1u, 1.0, vec4<f32>(1.0, 2.0, 3.0, 4.0));
}