test/tint/expressions/type_conv/mat4x4/var/f16-f32.wgsl

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