Rollup merge of #91264 - GuillaumeGomez:macro-jump-to-def, r=jsha
Add macro support in jump to definition feature Fixes #91174. To do so, I check if the span comes from an expansion, and if so, I infer the original macro `DefId` or `Span` depending if it's a defined in the current crate or not. There is one limitation due to macro expansion though: ```rust macro_rules! yolo { () => {}} fn foo() { yolo!(); } ``` In `foo`, `yolo!` won't be linked because after expansion, it is replaced by nothing (which seems logical). So I can't get an item from the `Visitor` from which I could tell if its `Span` comes from an expansion. I added a test for this specific limitation alongside others. Demo: https://rustdoc.crud.net/imperio/macro-jump-to-def/src/foo/check-source-code-urls-to-def-std.rs.html As for the empty macro issue that cannot create a jump to definition, you can see it [here](https://rustdoc.crud.net/imperio/macro-jump-to-def/src/foo/check-source-code-urls-to-def-std.rs.html#35). r? ```@jyn514```
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