@stage(compute) @workgroup_size(1)
fn f() {
  let a = mat2x4<f32>(vec4<f32>(1.0, 2.0, 3.0, 4.0), vec4<f32>(5.0, 6.0, 7.0, 8.0));
  let b = mat4x2<f32>(vec2<f32>(-1.0, -2.0), vec2<f32>(-3.0, -4.0), vec2<f32>(-5.0, -6.0), vec2<f32>(-7.0, -8.0));
  let r : mat4x4<f32> = (a * b);
}