GDB and Valgrind work quite well, see for example: - https://hookrace.net/blog/what-makes-nim-practical/#debugging-nim https://hookrace.net/blog/what-makes-nim

GDB and Valgrind work quite well, see for example: - https://hookrace.net/blog/what-makes-nim-practical/#debugging-nim https://hookrace.net/blog/what-makes-nim-practical/#debuggin... - https://hookrace.net/blog/writing-an-async-logger-in-nim/#optimization https://hookrace.net/blog/writing-an-async-logger-in-nim/#op... Edit: You can of course also change the program itself, using echo and writeStackTrace to figure out what's going on.