Comment by very-old-sw

50 years ago, fortran iv had the "extended range of a do loop". You could jump out of a loop execute some code, then jump back in. Therefore 2 loops could execute the same out-of-loop code. It was useful; preprocessors like Flecs used it to emulate missing control structures.

ChatGPT says, "likely to need manual conversion". So no Fortran hasn't been stable. In another post I showed that C hasn't either.