Instead of saying to "consider adding a `#[repr(C)]` or
`#[repr(transparent)]` attribute to this struct", we now tell users to
"Use `*const ffi::c_char` instead, and pass the value from
`CStr::as_ptr()`" when the type involved is a `CStr` or a `CString`.

Co-authored-by: Jieyou Xu <jieyouxu@outlook.com>

```
error[E0277]: the size for values of type `str` cannot be known at compilation time
  --> $DIR/unsized-str-in-return-expr-arg-and-local.rs:15:9
   |
LL |     let x = *"";
   |         ^ doesn't have a size known at compile-time
   |
   = help: the trait `Sized` is not implemented for `str`
   = note: all local variables must have a statically known size
   = help: unsized locals are gated as an unstable feature
help: references are always `Sized`, even if they point to unsized data; consider not dereferencing the expression
   |
LL -     let x = *"";
LL +     let x = "";
   |
```

fixes rust-lang#119480

Detect `*` operator on `!Sized` expression

The suggestion is new:

```
error[E0277]: the size for values of type `str` cannot be known at compilation time
  --> $DIR/unsized-str-in-return-expr-arg-and-local.rs:15:9
   |
LL |     let x = *"";
   |         ^ doesn't have a size known at compile-time
   |
   = help: the trait `Sized` is not implemented for `str`
   = note: all local variables must have a statically known size
   = help: unsized locals are gated as an unstable feature
help: references to `!Sized` types like `&str` are `Sized`; consider not dereferencing the expression
   |
LL -     let x = *"";
LL +     let x = "";
   |
```

Fix rust-lang#128199.

…id-outer-style-sugg, r=cjgillot

Don't suggest turning crate-level attributes into outer style

Fixes rust-lang#127930

Add a special case for `CStr`/`CString` in the `improper_ctypes` lint

Revives rust-lang#120176. Just needed to bless a test and fix an argument, but seemed reasonable to me otherwise.

Instead of saying to "consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct", we now tell users to "Use `*const ffi::c_char` instead, and pass the value from `CStr::as_ptr()`" when the type involved is a `CStr` or a `CString`.

The suggestion is not made for `&mut CString` or `*mut CString`.

r? ``````@cjgillot`````` (since you were the reviewer of the original PR rust-lang#120176, but feel free to reroll)

…r-errors

Print the generic parameter along with the variance in dumps.

This allows to make sure we are testing what we think we are testing.

While the tests are correct, I discovered that opaque duplicated args are in the reverse declaration order.

…case, r=notriddle

rustdoc: show exact case-sensitive matches first

fixes rust-lang#119480

…ature, r=dtolnay

Put Pin::as_deref_mut in impl Pin<Ptr> / rearrange Pin methods

Tracking issue: rust-lang#86918

Based on the suggestion in rust-lang#86918 (comment)

> Some advantages:
>
>  * Synergy with the existing `as_ref` and `as_mut` signatures (stable since Rust 1.33)
>
>  * Lifetime elision reduces noise in the signature
>
>  * Turbofish less verbose: `Pin::<&mut T>::as_deref_mut` vs `Pin::<&mut Pin<&mut T>>::as_deref_mut`

The comment seemed to imply that `Pin::as_ref` and `Pin::as_mut` already share an impl block, which they don't. So, I rearranged it so that they do, and we can see which looks better in the docs.

<details><summary><b>Docs screenshots</b></summary>

Current nightly:
![image](https://github.com/user-attachments/assets/b432cb82-8f4b-48ae-bafc-2fe49d0ad48c)

`Pin::as_deref_mut` moved into the same block as `as_mut`:
![image](https://github.com/user-attachments/assets/f9b35722-6a88-4465-ad1c-28d8e91902ac)

`Pin::as_ref`, `as_mut`, and `as_deref_mut` all in the same block:
![image](https://github.com/user-attachments/assets/9a1b2bf0-70a6-4751-b13f-390f1d575244)

</details>

I think I like the last one the most; obviously I'm biased since I'm the one who rearranged it, but it doesn't make sense to me to have `as_ref` methods split up by an `into_inner` method.

r? dtolnay

Update `compiler_builtins` to `0.1.121`

To pick up rust-lang/compiler-builtins#673 and unblock rust-lang#129403

r? tgross35

…ieyouxu

Add myself to the review rotation for libs

I am feeling better, and my new job gives me some time to do this.

Make wasm32 platform support docs easier to read

…, r=ehuss

update the doc comment on lintchecker b/c it parses html now