enable f16;
var<private> u = mat4x3<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);
fn f() {
    var v : mat4x3<f16> = mat4x3<f16>(u);
}