let m = mat4x2(mat4x2(0.0f, 1.0f,
                      2.0f, 3.0f,
                      4.0f, 5.0f,
                      6.0f, 7.0f));

fn f() -> mat4x2<f32> {
    let m_1 = mat4x2(m);
    return m_1;
}