`Self` on its own does not resolve in intra-doc links

[jyn514]

I tried this code:

/// [Self]
pub struct S { u: usize }

I expected to see this happen: The link behaves the same as struct@S

Instead, this happened: Rustdoc says the link failed to resolve:

warning: unresolved link to `Self`
 --> s.rs:1:6
  |
1 | /// [Self]
  |      ^^^^ the module `s` contains no item named `Self`

Note that Self::u resolves fine.

Meta

rustdoc --version:

rustdoc 1.48.0-nightly (ef663a8a4 2020-09-30)

[jyn514]

crate too (I think since #76467). crate doesn't fail to resolve, it's just wrong across crates (see the hack in #77253).