It is funny how using a Web IDE, and a cloud shell, is such a déjà vu from when I used to do development on a common UNIX server shared by the whole team.
My first experience with such a setup was connecting to DG/UX, via the terminal application on Windows for Workgroups, or some thin client terminals in a mix of green or ambar phosphor, spread around the campus.
The only time I used a Pascal compiler in ISO Pascal mode, it had the usual extensions inspired on UCSD, but we weren't allowed to use them on the assignments.