I don't have a login on rust-lang yet, but I wanted to add this comment regarding the documentation:
The rust-doc auto generated pages are really confusing. The sidebar generally fails to show where in the hierarchy of the API docs you are (ideally it would highlight the current page you're looking at in the hierarchy and provide the full hierarchy to give you context), the breadcrumbs don't indicate that they are links, the breadcrumbs indicate the type of the entry to the left rather than the right adding semantic confusion, and long pages tend to not have a TOC meaning you have to either search in the page or know the page structure ahead of time (probably mostly an issue for new users).
I feel like those are all simple mechanical issues that could make the auto-generated rust-docs a lot more useful.
It'd also be nice to tie non-auto generated docs into a crate's documentation, but I haven't looked into how rustdoc works so I'd guess that's possible but a lot of people don't do it.