Auto merge of #137229 - GuillaumeGomez:expand-macro, r=lolbinarycat

Add support for macro expansion in rustdoc source code pages

This is what it looks like:

![Screenshot From 2025-02-18 18-08-51](https://github.com/user-attachments/assets/ce2b3806-6218-47df-94bf-e9e9ed40cd41)

![image](https://github.com/user-attachments/assets/891042db-8632-4dba-9343-e28570c058fe)

You can test it [here](https://rustdoc.crud.net/imperio/macro-expansion/src/lib/lib.rs.html). In this case, I also enabled the `--generate-link-to-definition` to show that both options work well together.

Note: <del>There is a bug currently in firefox where the line numbers are not displayed correctly if they're inside the "macro expansion" span: https://bugzilla.mozilla.org/show_bug.cgi?id=1949948<del> Found a workaround around this bug.

r? `@notriddle`

1 files changed, 1 insertions, 1 deletions

diff --git a/src/librustdoc/html/render/span_map.rs b/src/librustdoc/html/render/span_map.rs
index 846d3ad310c..8bc2e0bd957 100644
--- a/src/librustdoc/html/render/span_map.rs
+++ b/src/librustdoc/html/render/span_map.rs
@@ -35,7 +35,7 @@ pub(crate) enum LinkFromSrc {
 /// 1. Generate a `span` correspondence map which links an item `span` to its definition `span`.
 /// 2. Collect the source code files.
 ///
-/// It returns the `krate`, the source code files and the `span` correspondence map.
+/// It returns the source code files and the `span` correspondence map.
 ///
 /// Note about the `span` correspondence map: the keys are actually `(lo, hi)` of `span`s. We don't
 /// need the `span` context later on, only their position, so instead of keeping a whole `Span`, we