enable f16;
var<private> u = mat4x3<f16>(1.0h, 2.0h, 3.0h,
                             4.0h, 5.0h, 6.0h,
                             7.0h, 8.0h, 9.0h,
                             10.0h, 11.0h, 12.0h);
fn f() {
    var v : mat4x3<f32> = mat4x3<f32>(u);
}