Also sort sidebar alphabetically by document filename

The code was broken anyway, if the deaggregator is disabled, it would have ICE on any non-enum Adt

update: actions/checkout@v2 to actions/checkout@v3 for all yaml files

Revert "update: actions/checkout@v2 to actions/checkout@v3 for all yaml files"

This reverts commit 7445e582b900f0f56f5f2bd9036aacab97ef28e9.

change GitHub Actions version v2 to v3

change GitHub Actions

The current "This is supported" wording implies that it's possible to
still use the item on other configurations, but in an unsupported way.
Changing this to "Available" removes this ambiguity.

…pnkfelix

Only add codegen backend to dep info if -Zbinary-dep-depinfo is used

I am currently migrating the cg_clif build system from using a binary linked to the codegen backend as rustc replacement to passing `-Zcodegen-backend` instead. Without this PR this would force cargo to rebuild the sysroot on any change to the codegen backend even if I explicitly specify that I want it to be preserved, which would make development of cg_clif a lot slower. If you still want to have changes to the codegen backend invalidate the cargo build cache you can explicitly specify `-Zbinary-dep-depinfo`.

cc `@eddyb` as the codegen backend was initially added to the depinfo for rust-gpu.

Add missing links in platform support docs

I was looking at m68k support and saw that https://doc.rust-lang.org/rustc/platform-support.html and the sidebar there were missing some links to target documentation

…i-obk

make unaligned_references lint deny-by-default

This lint has been warn-by-default for a year now (since rust-lang#82525), so I think it is time to crank it up a bit. Code that triggers the lint causes UB (without `unsafe`) when executed, so we really don't want people to write code like this.

…comment, r=petrochenkov

Improve diagnostics for unterminated nested block comment

close rust-lang#95283

(This is my first time try to messing around with rust compiler and might get a lot of things wrong... 🙇 )

…rochenkov

Consider lifetimes when comparing types for equality in MIR validator

Closes rust-lang#95978 .

…hub-action-version, r=pietroalbini

Update GitHub Actions actions/checkout Version v2 -> v3

Update `actions/checkout@v2` to `actions/checkout@v3` because of Node12 will be out of life after Aril 30, 2022 [[Reference](https://nodejs.org/en/about/releases/)].
`actions/xxxx@v3` use Node16 whose support lasts until April 30, 2024.

…fJung

Remove some now-dead code that was only relevant before deaggregation.

The code was broken anyway, if the deaggregator is disabled, it would have ICEd on any non-enum Adt

r? ``@RalfJung``

…aumegomez

clarify doc(cfg) wording

The current "This is supported" wording implies that it's possible to
still use the item on other configurations, but in an unsupported way.
Changing this to "Available" removes this ambiguity.

…thomcc

[test] Add test cases for untested functions for BTreeMap

- add `pop_first()`, `pop_last()`, `get_key_value()` and `try_insert()` test cases

Update mdbook

This just brings in a few small fixes, particularly a rendering fix for chapter names with markdown in them (like the https://doc.rust-lang.org/nightly/rustc/platform-support/kmc-solid.html page).  There's also a minor fix for the search index for duplicate headings.

Changelog: https://github.com/rust-lang/mdBook/blob/master/CHANGELOG.md#mdbook-0418