I'm using Google's antigravity IDE. I initially had it configured to run allowed commands (cargo add|build|check|run, testing shell scripts, performance profiling shell scripts, etc.) so that it would iterate & fix bugs w/ as little intervention from me as possible but all it did was burn through the daily allotted tokens so I switched to more "manual" guidance & made a lot more progress w/o burning through the daily limits.

What I've learned from this experiment is that the hype does not actually live up to the reality. Maybe the next iteration will manage the task better than the current one but it's obvious that basic compiler & bytecode virtual machine design in a language like Rust is still beyond the capabilities of the current coding agents & whoever thinks I'm wrong is welcome to implement the linked specification to see how far they can get by just "vibing".