Warn if an item coming from more recent version than MSRV is used Part of https://github.com/rust-lang/rust-clippy/issues/6324. ~~Currently, the lint is not working for the simple reason that the `stable` attribute is not kept in dependencies. I'll send a PR to rustc to see if they'd be okay with keeping it.~~ EDIT: There was actually a `lookup_stability` function providing this information, so all good now! cc `@epage` changelog: create new [`incompatible_msrv`] lint