rustdoc: Macros re-exported via use_extern_macro appear as a re-export

[Nemo157]

Most other items re-exported from an extern crate appear as if they're defined directly in the place they're re-exported from. For some reason macros are not currently treated the same way, they show up under the "Re-exports" heading and don't have their documentation summary shown. For futures this would be very useful for documenting the async/await macros in the facade.

Example (code here):

[QuietMisdreavus]

I think this should have been fixed with #51011 (and later #51611). However, now the proc-macro re-export may not appear? IIRC, rustdoc doesn't even try to document proc-macros. Can you try running docs for your demo crate with the latest nightly?

[Nemo157]

I've regenerated and pushed the docs to the link in the OP. The normal macro is fixed, but the proc-macro re-export has stayed the same (including #49553 messing up the link).

[QuietMisdreavus]

Aha! Thanks so much for making a test case like this, it'll really help for testing it. I'll close this in favor of #49553, since that seems to describe the outstanding issue better.