I said any systems programming language, and stated the rules, so I gather you don't want to play this game after all.

> Or what about you do an audio or video codec? Or an operating system?

There are already plenty of examples out there, Claude can probably help you there regarding history of such products not written in C, or where C required help from Assembly code.

You can start by researching IBM i, z/OS, OS 2200, Xerox Alto, DirectX and Metal (C++ for the most part, and Objective-C++ on the 2nd)

> This requires intrusively linked lists,....

And the C99 version is impossible to be written in Ada95 because?