uniform half4 colorRed, colorGreen;

bool do_side_effect(out bool x) {
    x = true;
    return false;
}

const bool TRUE = true;
const bool FALSE = false;

half4 main(float2 coords) {
    bool ok;

    ok = (colorRed == colorGreen) ? true : true;

    ok = ok && (colorGreen.g == 1 ? true : true);
    ok = ok && (colorGreen.g == 0 ? TRUE : true);
    ok = ok || (colorGreen.g == 1 ? false : false);
    ok = ok || (colorGreen.g == 0 ? false : FALSE);

    half4 green = coords.x == coords.y ? colorGreen : colorGreen;
    half4 red   = coords.x != coords.y ? colorRed   : colorRed;

    // Make sure side effects are honored.
    bool param = false;
    bool call = do_side_effect(param) ? true : true;

    return (ok && param && call) ? green : red;
}