I agree on the value of tests, but it somewhat depends on what you're working on as to how hard it is to get a certain level of test coverage. I tend to work on a garbage collector, which is notoriously good at collecting the flaws in all memory manipulation code anywhere, and funneling them down to a couple of crash sites where we are traversing memory. We use assertions very heavily to get mileage out of everyone else's test cases, and we add regression tests studiously, but we still end up in the debugger a lot.

Also, one surprisingly useful feature of rr is that just about everything is debuggable without needing to plumb through debugger invocations through your whole system. It will record an entire process tree, so you can go back after the fact and select which process to replay debug. It's incredibly useful. I've been so happy to ditch my weird wrapper scripts to run cc1plus under a debugger while compiling with a buggy static analysis plugin I'm working on. Now I just run `rr record make` and wait for it to crash. It's magical.