> You wouldn't say C "has exceptions" would you?

Maybe that's just me, but I wish more people would say that C "has exceptions", if only because longjmp/setjmp[0] interacts with exception systems of other languages, sometimes badly.

That being said, I think an important difference is that in C setjmp/longjmp do not "unwind" objects, due to the lack of destructors.

However panics at least in Rust are just exceptions by another name. The difference solely comes from culture. Even the fact that unwind can be turned to abort is not significant, considering that pretty much all production implementations of C++ have fno-exceptions

[0]: https://learn.microsoft.com/en-us/cpp/cpp/using-setjmp-longj...