… error in borrowck

This commit is adding the possibility to parse the `_` as
an expression inside the esition 2024.

Link: https://rust-lang.zulipchat.com/#narrow/stream/404510-wg-macros/topic/supporting.20.60_.60.20expressions
Co-authored-by: Eric Holk <eric@theincredibleholk.org>
Signed-off-by: Vincenzo Palazzo <vincenzopalazzodev@gmail.com>

Co-authored-by: Eric Holk <eric@theincredibleholk.org>
Signed-off-by: Vincenzo Palazzo <vincenzopalazzodev@gmail.com>

Co-authored-by: Eric Holk <eric@theincredibleholk.org>

…petrochenkov

Add `REDUNDANT_IMPORTS` lint for new redundant import detection

Defaults to Allow for now. Stacked on rust-lang#123744 to avoid merge conflict, but much easier to review all as one.

r? petrochenkov

…pression_tok, r=eholk,compiler-errors

[RFC] mbe: consider the `_` in 2024 an expression

This commit is adding the possibility to parse the `_` as an expression inside the esition 2024.

Link: https://rust-lang.zulipchat.com/#narrow/stream/404510-wg-macros/topic/supporting.20.60_.60.20expressions

Issue rust-lang#123742

r? `@eholk`

…wjasper

match lowering: Hide `Candidate` from outside the lowering algorithm

The internals of `Candidate` are tricky and a source of confusion. This PR makes it so we don't expose `Candidate`s outside the lowering algorithm. Now:
- false edges are handled in `lower_match_tree`;
- `lower_match_tree` takes a list of patterns as input;
- `lower_match_tree` returns a flat datastructure that contains only the necessary information.

r? ```@matthewjasper```

…=estebank

Peel off explicit (or implicit) deref before suggesting clone on move error in borrowck, remove some hacks

Also remove a heck of a lot of weird hacks in `suggest_cloning` that I don't think we should have around.

I know this regresses tests, but I don't believe most of these suggestions were accurate, b/c:
1. They either produced type errors (e.g. turning `&x` into `x.clone()`)
2. They don't fix the issue
3. They fix the issue ostensibly, but introduce logic errors (e.g. cloning a `&mut Option<T>` to then `Option::take` out...)

Most of the suggestions are still wrong, but they're not particularly *less* wrong IMO.

Stacked on top of rust-lang#128241, which is an "obviously worth landing" subset of this PR.

r? estebank

Add myself as VxWorks target maintainer for reference

Hi, would be working on VxWorks regularly, thus adding myself as a target maintainer.
r? ```@workingjubilee```

Add special-case for [T, 0] in dropck_outlives

implements/fixes rust-lang#110288.

r? `@lcnr`

Fix docs for OnceLock::get_mut_or_init

Removes an incorrect statment about concurrency from the `OnceLock::get_mut_or_init` (tracked in rust-lang#121641) docs.

Fixes rust-lang#128429