enable f16;
var<private> u = mat3x4<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 : mat3x4<f16> = mat3x4<f16>(u);
}