I'd think it would be much easier for a preprocessor to determine that it is done with a file, once it encounter that pragma, instead of having to scan for the

I'd think it would be much easier for a preprocessor to determine that it is done with a file, once it encounter that pragma, instead of having to scan for the corresponding #endif (not sure if it'll dare to scan from the back and hope that all #if/#ifdef, #endif pairs match or whether it diligently checks those every time).