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fe62c6e295
Emit errors/warns on some wrong uses of rustdoc attributes This PR adds a few diagnostics: - error if conflicting `#[doc(inline)]`/`#[doc(no_inline)]` are found - introduce the `invalid_doc_attributes` lint (warn-by-default) which triggers: - if a crate-level attribute is used on a non-`crate` item - if `#[doc(inline)]`/`#[doc(no_inline)]` is used on a non-`use` item The code could probably be improved but I wanted to get feedback first. Also, some of those changes could be considered breaking changes, so I don't know what the procedure would be? ~~And finally, for the warnings, they are currently hard warnings, maybe it would be better to introduce a lint?~~ (EDIT: introduced the `invalid_doc_attributes` lint) Closes #80275. r? `@jyn514`