HTML files were needed for testing `-Z dump-mir-spanview`, but that flag has
been removed by rust-lang#119566.

…Amanieu

stabilise bound_map

Closes rust-lang#86026

…, r=lcnr

Define hidden types in confirmation

fixes  rust-lang#111470

r? `@lcnr` or `@compiler-errors`

explanation in the newly added test

…r=oli-obk

Inline `check_closure`, simplify `deduce_sig_from_projection`

Some minor cleanups that I've collected when reimplementing async closure

r? oli-obk

…nv-ty, r=oli-obk

Simplify `closure_env_ty` and `closure_env_param`

Random cleanup that I found when working on async closures. This makes it easier to separate the latter into a new tykind.

…=dtolnay

Add private `NonZero<T>` type alias.

According to step 2 suggested in rust-lang#100428 (review).

This adds a private type alias for `NonZero<T>` so that some parts of the code can already start using `NonZero<T>` syntax.

Using `NonZero<T>` for `convert` and other parts which implement `From` doesn't work while it is a type alias, since this results in conflicting implementations.

Update books

## rust-lang/nomicon

1 commits in f6bd083c4ccfc4ce6699b8b4154e3c45c5a27a8c..6bc2415218d4dd0cb01433d8320f5ccf79c343a1
2024-01-03 04:01:04 UTC to 2024-01-03 04:01:04 UTC

- Update an example of `thread_local` to use `local_key_cell_methods` (rust-lang/nomicon#438)

## rust-lang/reference

1 commits in 3565c7978cfc9662f5963b135690ff9cbbfa0318..8c77e8be9da1a9c70545556218d563c8d061f1fd
2024-01-08 15:16:51 UTC to 2024-01-08 15:16:51 UTC

- Document that <- is a single token (rust-lang/reference#1424)

## rust-lang/rust-by-example

4 commits in c0be6299e52e4164c30ba6f41bd0ad0aaee64972..ddf5cb0e6ee54ba2dd84c8ca3e1314120014e20d
2024-01-13 11:06:22 UTC to 2024-01-13 11:01:00 UTC

- Update attribute.md, (rust-lang/rust-by-example#1791)
- fix: typo `unusude` (rust-lang/rust-by-example#1797)
- Update print.md (rust-lang/rust-by-example#1796)
- Update alias.md (rust-lang/rust-by-example#1790)

## rust-lang/rustc-dev-guide

4 commits in d13e85152a977cd0bcaf583cf5f49e86225697de..4af29d1a7f64f88a36539662c6a84fe1fbe6cde1
2024-01-14 10:42:53 UTC to 2024-01-06 17:47:01 UTC

- Expand upon PR guidelines (rust-lang/rustc-dev-guide#1851)
- Correct the link to rust reference (rust-lang/rustc-dev-guide#1848)
- Explain the important concepts of exhaustiveness checking (rust-lang/rustc-dev-guide#1830)
- Add guide for rustdoc search implementation (rust-lang/rustc-dev-guide#1846)

…-errors

Lint `overlapping_ranges_endpoints` directly instead of collecting into a Vec

In rust-lang#119396 I was a bit silly: I was trying to avoid any lints being fired from within the exhaustiveness algorithm for some vague aesthetic/reusability reason that doesn't really hold. This PR fixes that: instead of passing a `&mut Vec` around I just added a method to the `TypeCx` trait.

r? `@compiler-errors`

Don't allow `.html` files in `tests/mir-opt/`

HTML files were needed for testing `-Z dump-mir-spanview`, but that flag has been removed by rust-lang#119566.