Back in grad school, I had the pleasure of working with some very old FORTRAN. Written conservatively using a few bits of FORTRAN 77, but mainly in a FORTRAN 66 style. The control structures I found in there would make you go crosseyed. At one point, there was a jump that took you from outside a loop to the middle of the body of the loop. Today's no-longer-all-caps Fortran manages to elude EWD's criticism by not being that language any longer. You have to use a lot of obscure compiler flags even to make the old stuff compile.