dawn-cmake/test/shader_io/vertex_output_locations_struct.wgsl

struct VertexOutputs {
  [[location(0), interpolate(flat)]] loc0 : i32;
  [[location(1), interpolate(flat)]] loc1 : u32;
  [[location(2)]] loc2 : f32;
  [[location(3)]] loc3 : vec4<f32>;
  [[builtin(position)]] position : vec4<f32>;
};

[[stage(vertex)]]
fn main() -> VertexOutputs {
  return VertexOutputs(1, 1u, 1.0, vec4<f32>(1.0, 2.0, 3.0, 4.0), vec4<f32>());
}