What is this lint about

The invalid_doc_attributes lint detects incorrect uses of #[doc(...)] attributes or uses of non-existent #[doc(...)] attributes. For example, #[doc(alias = 42)] will trigger this lint, since 42 is not a string. Also, #[doc(foobar)] will trigger this lint.

If you are here because of a warning about doc(primitive), see #88070 instead.

Original issue

From #82702: Currently the warning reuses the existing unknown_attributes lint, but to properly do future incompatibility we need to use the special infrastructure that exists for it.

We should also consider sticking this into the edition (see #80165), though I'm not sure if it can be automatically upgraded. This might be one of the cases where it doesn't matter.