rustdoc links to type aliases that don't exist in search results

[RalfJung]

There are bad (404) links in search results with nightly rustdoc. E.g. go to https://doc.rust-lang.org/nightly/std/?search=as_raw_fd and then click the std::RawFd::as_raw_fd result. This leads to https://doc.rust-lang.org/nightly/std/type.RawFd.html#method.as_raw_fd which does not exist.

Cc @rust-lang/rustdoc

[RalfJung]

Actually, this issue seems to exist even on stable -- somehow it went unnoticed for quite a while, it seems.

[GuillaumeGomez]

I think it's because we are badly handling a reexport/type alias.

[jyn514]

I think this is a duplicate of #78724.