uniform half4 colorGreen, colorRed;

float get() {
    switch (2) {
        case 1: return abs(1);
        case 2: return abs(2);  // Only this case should be preserved.
        case 3: return abs(3);
        case 4: return abs(4);
    }
    // This won't be removed because dead-code elimination is disabled.
    return abs(5);
}

half4 main(float2 coords) {
    float result = get();
    return result == 2 ? colorGreen : colorRed;
}