rustdoc renders stability attribute for trait implementations on type pages, but not trait pages

[jplatte]

For example, impl BitOr<NonZeroU128> for NonZeroU128 being stable since 1.45.0 is visible on the page for NonZeroU128:

but not on the page for BitOr:

(also the latter doesn't have BitOr linkified while the former has NonZeroU128 linkified, but self-links seem less important)

[jyn514]

(also the latter doesn't have BitOr linkified while the former has NonZeroU128 linkified, but self-links seem less important)

I would guess the same bug is causing both issues.

[LeSeulArtichaut]

I'll try to investigate and see if I can find something interesting :)

[LeSeulArtichaut]

(kind of obvious) MCVE:

#![feature(staged_api)]

pub trait Foo {}

pub struct Bar;

#[stable(feature = "foobar", since = "1.0.0")]
impl Foo for Bar {}

[LeSeulArtichaut]

(also the latter doesn't have BitOr linkified while the former has NonZeroU128 linkified, but self-links seem less important)

I would guess the same bug is causing both issues.

Not self-linking seems to be expected behavior, this was made in #32558 back in 2016. What looks inconsistent to me however is that "Implementations on Foreign Types" do self-link.