Fortran compiler (f77 maybe?) on a Sun system had reserved filenames. In Finland, back in the late 90's first-year chemistry students were still exposed to Fort

Fortran compiler (f77 maybe?) on a Sun system had reserved filenames. In Finland, back in the late 90's first-year chemistry students were still exposed to Fortran as their entry to programming. I was helping another student debug their programming assignment, which blew up the compiler. Over the shoulder I couldn't figure out what it supposedly wrong, so we copied it (via /scratch) to my home directory. I just shortened the name a bit. Tried to compile on my account, it worked. No errors. Confirmed it was the same compiler being invoked. So we copied the file to a new name on the other student's account and tried. Worked. Same file content, two different file names. One compiles fine, another hits internal compiler error paths. Introduction to programming indeed.