struct UBO {
  dynamic_idx: i32,
};
@group(0) @binding(0) var<uniform> ubo: UBO;
struct S {
  data: array<i32, 64>,
};
struct Result {
  out: i32,
};
@group(0) @binding(1) var<storage, read_write> result: Result;

@compute @workgroup_size(1)
fn f() {
  var s : S;
  s.data[ubo.dynamic_idx] = 1;
  result.out = s.data[3];
}