half2 tricky(half x, half y, inout half2 color, half z) {
    color.xy = color.yx;
    return half2(x + y, z);
}

void func(inout half4 color) {
    half2 t = tricky(1, 2, color.rb, 5);
    color.ga = t;
}

void main() {
    func(sk_FragColor);
}