let m = mat4x3(mat4x3(0.0f, 1.0f, 2.0f,
                      3.0f, 4.0f, 5.0f,
                      6.0f, 7.0f, 8.0f,
                      9.0f, 10.0f, 11.0f));

fn f() -> mat4x3<f32> {
    let m_1 = mat4x3(m);
    return m_1;
}