CC rust-lang#99430

… in expression

Suggest using a lock instead.

…s used

They were missing after recent move from src/test to tests.

This patch avoids hard-to-click single character links by making
the generic part of the link:

Before: <a href="#">&</a>T

After: <a href="#">&T</a>

…ckh726

Add hint for missing lifetime bound on trait object when type alias is used

Fix issue rust-lang#103582.

The problem: When a type alias is used to specify the return type of the method in a trait impl, the suggestion for fixing the problem of "missing lifetime bound on trait object" of the trait impl will not be created. The issue caused by the code which searches for the return trait objects when constructing the hint suggestion is not able to find the trait objects since they are specified in the type alias path instead of the return path of the trait impl.

The solution: Trace the trait objects in the type alias path and provide them along with the alias span to generate the suggestion in case the type alias is used in return type of the method in the trait impl.

Tweak E0597

CC rust-lang#99430

…tic, r=WaffleLapkin

Suggest using a lock for `*Cell: Sync` bounds

I mostly did this for `OnceCell<T>` at first because users will be confused to see that the `OnceCell<T>` in `std` isn't `Sync` but then extended it to `Cell<T>` and `RefCell<T>` as well.

Bring tests back into rustc source tarball

They were missing after recent move from src/test to tests.

cc ```@albertlarsan68```

Fixes rust-lang#107081

…rence-link, r=GuillaumeGomez

rustdoc: rearrange HTML in primitive reference links

This patch avoids hard-to-click single character links by making the generic part of the link:

Before: <a href="#">&</a>T

After: <a href="#">&T</a>

add test where we ignore hr implied bounds

r? types

Delete `SimplifyArmIdentity` and `SimplifyBranchSame` mir opts

I had attempted to fix the first of these opts in rust-lang#94177 . However, despite that PR already being a full re-write, it still did not fix some of the core soundness issues. The optimizations that are attempted here are likely to be desirable, but I do not expect any of the currently written code to survive into a sound implementation. Deleting the code keeps us from having to maintain the passes in the meantime.

Closes rust-lang#77359 , closes rust-lang#72800 , closes rust-lang#78628

r? ```@cjgillot```

…=notriddle

rustdoc: prohibit scroll bar on source viewer in Safari

Fixes rust-lang#106455.

…s, r=compiler-errors

erica solver: implement builtin `Pointee` trait impl candidates

r? ```@compiler-errors```