enable f16;
var<private> t : f16;
fn m() -> mat2x2<f16> {
    t = t + 1.0h;
    return mat2x2<f16>(1.0h, 2.0h,
                       3.0h, 4.0h);
}
fn f() {
    var v : mat2x2<f32> = mat2x2<f32>(m());
}