$ src/scc <<< "0xFFFFFFFFF 0xFFFFFFFFFFFFFFFFFlu"
Found number 0xFFFFFFFFF
Trying conversion as signed int… Failed
Trying conversion as unsigned int… Failed
Trying conversion as signed long int… Success!
Found number 0xFFFFFFFFFFFFFFFFFlu
Trying conversion as unsigned long int… Failed
Trying conversion as unsigned long long int… Failed
No possible conversion found for this literal integer, aborting