[[block]]
struct UBO {
  dynamic_idx : i32;
};

[[group(0), binding(0)]] var<uniform> ubo : UBO;

[[block]]
struct Result {
  out : i32;
};

[[group(0), binding(2)]] var<storage, read_write> result : Result;

[[block]]
struct SSBO {
  data : array<i32, 4>;
};

[[group(0), binding(1)]] var<storage, read_write> ssbo : SSBO;

[[stage(compute), workgroup_size(1)]]
fn f() {
  ssbo.data[ubo.dynamic_idx] = 1;
  result.out = ssbo.data[3];
}