uWaterloo uses an in-house language to teach advanced control flow, in my days it was uC++ built by Peter Buhr in CS343. They might have opted to use C for All now.

I've found it quite easy to spin up parallel tasks in uC++ if I needed both C++ and easy-to-use parallelism, the language isn't formally supported but for small student projects its pretty kick ass, also the prof who built it is just quick email away.

So all I'm all in favour of C for All as an alumni, hopefully it enriches the existing curriculum.