This was part of Mark's original PR in rust-lang@ecb424f,
but I missed it when writing rust-lang#92260.

This is required after LLVM change 3c4410d (aka
https://reviews.llvm.org/D121168) did some includes cleanup.

Better error for normalization errors from parent crates that use `#![feature(generic_const_exprs)]`

This PR implements a somewhat rudimentary heuristic to suggest using `#![feature(generic_const_exprs)]` in a child crate when a function from a foreign crate (that may have used `#![feature(generic_const_exprs)]`) fails to normalize during codegen.

cc: rust-lang#79018
cc: rust-lang#94287

…ottmcm

Document new recommended use of `FromIterator::from_iter`

rust-lang#90107
Most of the added prose was paraphrased from the links provided in the issue. The suggested `VecDeque` example seemed to make the point well enough so I just used that.

…ss, r=joshtriplett

Fix soundness issue in scoped threads.

This was discovered in rust-lang#94559 (comment)

The `scope()` function returns when all threads are finished, but I accidentally considered a thread 'finished' before dropping their panic payload or ignored return value.

So if a thread returned (or panics with) something that in its `Drop` implementation still uses borrowed stuff, it goes wrong.

https://play.rust-lang.org/?version=nightly&mode=debug&edition=2021&gist=2a1f19ac4676cdabe43e24e536ff9358

…=notriddle

Unify impl blocks by wrapping them into a div

The blanket and "auto traits" sections are wrapped into a `div` with an ID. This PR fixes this incoherence by wrapping each impl section (the "deref impl" and the "inherent impl" sections were missing it). It'll also make some tests simpler to write.

r? `````@notriddle`````

…GuillaumeGomez

Improve rustdoc book

This pull-request improves the `rustdoc` book by doing some (light) cleanup, by merging some stuff, by adding some missing stuff (like tracking issues links, for those who had one) and also by moving some chapter's into sub-chapter's to improve the flow of the book.

~~Note that I locally tested with `mdbook-lintcheck` that no links became accidentally broken.~~ (Not enough, ;-))

r? `````@GuillaumeGomez`````

…Simulacrum

Allow `cargo run` instead of `cargo run -p bootstrap`

This was part of `@Mark-Simulacrum` 's original PR in rust-lang@ecb424f,
but I missed it when writing rust-lang#92260.

This also has the side effect of allowing `cargo build --bins` instead of `cargo build -p bootstrap --bins`. I'm not sure when you would want to run cargo build/check/test without going through bootstrap, but this still allows you to do so as long as you pass `-p` for all the crates you want to build.

Revert accidental stabilization

fixes rust-lang#94804

RustWrapper: add missing include

This is required after LLVM change 3c4410d (aka
https://reviews.llvm.org/D121168) did some includes cleanup.

r? nikic