…ue types it may define

The current message for "`->` used for field access" is the following:

```rust
error: expected one of `!`, `.`, `::`, `;`, `?`, `{`, `}`, or an operator, found `->`
 --> src/main.rs:2:6
  |
2 |     a->b;
  |      ^^ expected one of 8 possible tokens
```

(playground link[1])

This PR tries to address this by adding a dedicated error message and recovery. The proposed error message is:

```
error: `->` used for field access or method call
 --> ./tiny_test.rs:2:6
  |
2 |     a->b;
  |      ^^ help: try using `.` instead
  |
  = help: the `.` operator will dereference the value if needed
```

(feel free to bikeshed it as much as necessary)

[1]: https://play.rust-lang.org/?version=stable&mode=debug&edition=2021&gist=7f8b6f4433aa7866124123575456f54e

Signed-off-by: Sasha Pourcelot <[email protected]>

Deny gen keyword in `edition_2024_compat` lints

Splits the `keyword_idents` lint into two -- `keyword_idents_2018` and `keyword_idents_2024` -- since each corresponds to a future-compat warning in a different edition. Group these together into a new `keyword_idents` lint group, and add the latter to the `rust_2024_compatibility` so that `gen` is ready for the 2024 edition.

cc `@traviscross` `@ehuss`

…=compiler-errors

Fix ICE when ADT tail has type error

Fixes rust-lang#124031

Use `DefiningOpaqueTypes::Yes` in rustdoc, where the `InferCtxt` is guaranteed to have no opaque types it can define

r? `@lcnr`

I manually checked there it's always `tcx.infer_ctxt().build()`

…e, r=notriddle

Move duplicated code in functions in `tests/rustdoc-gui/notable-trait.goml`

It also allowed me to add some new common test like:

```
        assert-position: (
            "//*[`@class='tooltip` popover']",
            {"x": |popover_x|}
        )
```

r? `@notriddle`

…rs,fmease

Improve handling of expr->field errors

The current message for "`->` used for field access" is the following:

```rust
error: expected one of `!`, `.`, `::`, `;`, `?`, `{`, `}`, or an operator, found `->`
 --> src/main.rs:2:6
  |
2 |     a->b;
  |      ^^ expected one of 8 possible tokens
```

([playground link](https://play.rust-lang.org/?version=stable&mode=debug&edition=2021&gist=7f8b6f4433aa7866124123575456f54e))

This PR tries to address this by adding a dedicated error message and recovery. The proposed error message is:

```
error: `->` used for field access or method call
 --> ./tiny_test.rs:2:6
  |
2 |     a->b;
  |      ^^ help: try using `.` instead
  |
  = help: the `.` operator will dereference the value if needed
```

(feel free to bikeshed it as much as necessary)

…=oli-obk

Miri: detect wrong vtables in wide pointers

Fixes rust-lang/miri#3497.
Needed to catch the UB that rust-lang#123572 will start exploiting.

r? `@oli-obk`

remove an unused type from the reentrant lock tests

At least it seems unused. This was added back in 45aa6c8 together with a test related to poisoning; when the test got removed, it seems like it was forgotten to also remove this type.