Remmirad

Is there any kind of requirement list? What I could gather so far from the above discussions, other comments and some own ideas is that the layering system should allow:...

Regarding an IDE independent way to pass env variables to rust-analyzer one could use the `[env]` part from `/.cargo/config.toml` rust-analyzer uses those (Or rather `cargo check` does).

Thanks for the feedback. Yes a fully reliable feature like this would need the complex `const` check. I briefly thought about changing the scope of the feature to "promise" only...