test/buffer/storage/types/mat2x2.wgsl

@group(0) @binding(0)
var<storage, read> in : mat2x2<f32>;

@group(0) @binding(1)
var<storage, read_write> out : mat2x2<f32>;

@stage(compute) @workgroup_size(1)
fn main() {
  out = in;
}