[imtringued]

What you need to do is have first party formal verification/design by contract support. Instead of the old school test bench approach, you should prioritize tools like fuzzing and model checking to find counter examples (e.g. bugs).

If there is something worth checking, but its only possible to check it in simulation (think UBSan), then you should add it anyway, just so that it can get triggered by a counterexample. (Think debug only signals/wires/record fields/inputs/outputs/components) You don't want people to write lengthy exhaustive tests or stare at waveforms all day.

Note that the point of formal verification here isn't to be uptight about writing perfect software in a vacuum. It's in fact the opposite. It's about being lazy and getting away with it. If you fuzz Rust code merely to make sure that you're not triggering panics, you've already made a huge improvement in software correctness, even though you haven't defined any application specific contracts yet!