test/layout/storage/mat2x2/f32.wgsl

struct SSBO {
  m : mat2x2<f32>;
};
[[group(0), binding(0)]] var<storage, read_write> ssbo : SSBO;

[[stage(compute), workgroup_size(1)]]
fn f() {
    let v = ssbo.m;
    ssbo.m = v;
}