Yeah, I think it's because none of the compilers are obligated to support the standard and things get added that never get implemented. A good example is the C

Yeah, I think it's because none of the compilers are obligated to support the standard and things get added that never get implemented. A good example is the C++11 standard garbage collection! It was explicitly optional but afiak no one implemented it. https://isocpp.org/wiki/faq/cpp11-library#gc-abi https://isocpp.org/wiki/faq/cpp11-library#gc-abi