enable f16;
var<private> u = mat4x2<f32>(1.0f, 2.0f,
                             3.0f, 4.0f,
                             5.0f, 6.0f,
                             7.0f, 8.0f);
fn f() {
    var v : mat4x2<f16> = mat4x2<f16>(u);
}