[[block]]
struct Uniforms {
  i : u32;
  j : u32;
};

[[group(1), binding(4)]] var<uniform> uniforms : Uniforms;

[[stage(compute), workgroup_size(1)]]
fn main() {
  var m1 : mat2x4<f32>;
  m1[uniforms.i][uniforms.j] = 1.0;
}