@compute @workgroup_size(1)
fn f() {
  let a = mat3x3<f32>(vec3<f32>(1.0, 2.0, 3.0), vec3<f32>(4.0, 5.0, 6.0), vec3<f32>(7.0, 8.0, 9.0));
  let b = mat3x3<f32>(vec3<f32>(-(1.0), -(2.0), -(3.0)), vec3<f32>(-(4.0), -(5.0), -(6.0)), vec3<f32>(-(7.0), -(8.0), -(9.0)));
  let r : mat3x3<f32> = (a - b);
}