Rls macro hover

Hopefully this is an ok question for the internals fourm.

I have a very WIP PR to rls for macro hovering macro_docs and rustc. Using the LateLintPass to collect rls_data::Defs and relate them to rls_data::Refs I have a, working in the current crate only, macro hover (anything from stdlib or core doesn't work). Is there a way to walk the imported crates, currently librust_save_analysis does not save MacroRefs which is likely what I would need?

I would love to help with this feature anyway I can.

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