Not sure what you're using - rust-analyzer does support format-on-save (in fact it's actually a VS Code built-in, rust-analyzer just exposes a formatter for Rus

Not sure what you're using - rust-analyzer does support format-on-save (in fact it's actually a VS Code built-in, rust-analyzer just exposes a formatter for Rust files that then gets used by the built-in format-on-save feature) Also compared to RLS it works much better on code with errors in, at least in my experience.