test/tint/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;
}