So hands up all those who remember CESIL ?

What, no-one studied Computing in the 1970's?

https://en.wikipedia.org/wiki/CESIL

Here's an opportunity:
OOP in MIX.
https://en.wikipedia.org/wiki/MIX

About languages which have disappeared over the decades, Rosetta Code references 874 different languages. Most of them are just dead...

https://rosettacode.org/wiki/Category:Programming_Languages

I'd forgotten about MIX. Knuth's TAOCP was referenced during our data structure/algorithms university courses and we had an implementation to play around with written by a 3rd year student as their project.

Many people might agree with me on this. OOP and Functional programming both have their place. For example, you wouldn't use C# for writing a kernel or any other low-level environment.

@NoahP: Is Haskell for kernel developers or do we disagree on the meaning of "functional programming"?

Actually Microsoft was doing research some years ago on an OS written almost entirely in C# and running as managed code, called Singularity. It was abandoned, which I think it's a shame because it was an interesting project, but it proves that it's definitely possible.

Huh, I ran across Cosmos, something that supposedly uses C# and is "an operating system development kit which uses Visual Studio as its development environment."

https://www.gocosmos.org/

Looks semi-interesting, but not something I want to fool around with.

Looks interesting. I'll save it for later, thanks!

I thought that Singularity is about containers for HPC: https://en.wikipedia.org/wiki/Singularity_(software)

That's a different one.
https://en.wikipedia.org/wiki/Singularity_(operating_system)