enable f16;
var<private> u = mat4x4<f32>(1.0f, 2.0f, 3.0f, 4.0f,
                             5.0f, 6.0f, 7.0f, 8.0f,
                             9.0f, 10.0f, 11.0f, 12.0f,
                             13.0f, 14.0f, 15.0f, 16.0f);
fn f() {
    var v : mat4x4<f16> = mat4x4<f16>(u);
}