test/tint/expressions/type_conv/mat2x4/var/f32-f16.wgsl

// flags:  --hlsl_shader_model 62
enable f16;
var<private> u = mat2x4<f32>(1.0f, 2.0f, 3.0f, 4.0f,
                             5.0f, 6.0f, 7.0f, 8.0f);
fn f() {
    var v : mat2x4<f16> = mat2x4<f16>(u);
}