I wrote a C helper library that does poor-man's exceptions using setjmp/longjmp https://github.com/adrianratnapala/elm0 https://github.com/adrianratnapala/elm0.

I wrote a C helper library that does poor-man's exceptions using setjmp/longjmp https://github.com/adrianratnapala/elm0 https://github.com/adrianratnapala/elm0. Partly because of the malloc/free issue, you don't just "throw and forget" like with real exceptions. Instead you jump a short way up the stack, using it as an extra mechanism for error handling inside a module -- living side by side with error returns. And I found myself using the mechanism quite a lot. To the point where writing a new error-returns based function gave me that itch where I felt this is mistake and I would end up refactoring to the TRY mechanism anyway.