This works around a bug in git itself; see
rust-lang#101144.

…1, r=thomcc

Don't re-export private/unstable ArgumentV1 from `alloc`.

The `alloc::fmt::ArgumentV1` re-export was marked as `#[stable]` even though the original `core::fmt::ArgumentV1` is `#[unstable]` (and `#[doc(hidden)]`).

(It wasn't usable though:

```
error[E0658]: use of unstable library feature 'fmt_internals': internal to format_args!
 --> src/main.rs:4:12
  |
4 |     let _: alloc::fmt::ArgumentV1 = todo!();
  |            ^^^^^^^^^^^^^^^^^^^^^^
  |
  = help: add `#![feature(fmt_internals)]` to the crate attributes to enable
```
)

Part of rust-lang#99012

…ark-Simulacrum

Pass `branch.{branch}.remote=origin` to `git submodule update`

This works around a bug in git itself.
Fixes rust-lang#101144.

…=cjgillot

Make `unsizing_params_for_adt` into a query

Addresses a FIXME in confirmation.

r? ``@ghost``

…-Simulacrum

Add option to include private items in library docs

I need to perform some one-off analysis on libcore, and I wanted to use the unstable JSON rustdoc output to easily do it. Unfortunately, there is currently no way to include unstable items in the library docs. This PR adds support for that, with the off-by-default `build.library-docs-private-items` setting.

…-Simulacrum

Fix typo in `{Rc, Arc}::get_mut_unchecked` docs

Just a correction in the documentation of `{Rc, Arc}::get_mut_unchecked`.

end entry paragraph with a period (.)