I&#x27;d personally like to find the time to write this – some of the infrastructure (like call graph analysis) is already available.<p>However, I think this is the nuclear option. I have some experience from university where I wrote some Eiffel code, contracts and all that jazz. It often takes some head scratching to figure out the right pre- and postconditions.<p>I&#x27;d actually rather see more safe interfaces for the common cases (like iterators and slices) that are ergonomic to use and may actually carry the proof in their types.