[[block]]
struct S {
  v : vec3<i32>;
};

[[group(0), binding(0)]] var<storage, read_write> U : S;

fn f() {
  U.v = vec3<i32>(1, 2, 3);
  U.v.x = 1;
  U.v.y = 2;
  U.v.z = 3;
}