If there's an ICE while bootstrapping, it's most likely because of a change to the compiler.

Co-authored-by: Joshua Nelson <joshua@yottadb.com>

…oo one day

Changes "is includes" to "includes" in `rustc_mir::borrow_check::type_check::type_check`.

…nstead

The "aliases" attribute is not listed [on MDN], so it sounds like
it's rustdoc-specific. We don't want to conflict with any attributes
that are added to the spec in the future.

[on MDN]: https://developer.mozilla.org/en-US/docs/Web/HTML/Element/Heading_Elements

…/rustdoc`

…mulacrum

Ignore commented out lines when finding features

This fixes rust-lang#76246, where commented out lines were being detected as features by `tidy`, by ignoring those lines when looking for features. It's still not perfect, since it can be fooled by things like:
```rust
/*
#[unstable(feature = "foo", issue = "1234")]
*/
```
But luckily that never happens in `rustc`, so `foo` now ceases to appear in the unstable book.

…Simulacrum

Build sanitizers for x86_64-unknown-linux-musl

The support of sanitizers on target `x86_64-unknown-linux-musl` is landed in rust-lang#84126

…crum

Set `backtrace-on-ice` by default for compiler and codegen profiles

If there's an ICE while bootstrapping, it's most likely because of a change to the compiler.

…crum

Add `x.py check src/librustdoc` as an alias for `x.py check src/tools/rustdoc`

I keep making this typo, it would be nice for it to be supported.

Point out that behavior might be switched on 2015 and 2018 too one day

Reword documentation to make it clear that behaviour can be switched on older editions too, one day in the future. It doesn't *have* to be switched, but I think it's good to have it as an option and re-evaluate it a few months/years down the line when e.g. the crates that showed up in crater were broken by different changes in the language already.

cc rust-lang#25725, rust-lang#65819, rust-lang#66145, rust-lang#84147 , and rust-lang#84133 (comment)

…illaumeGomez

rustdoc: change aliases attribute to data-aliases

The "aliases" attribute is not listed [on MDN], so it sounds like it's rustdoc-specific. We don't want to conflict with any attributes that are added to the spec in the future.

[on MDN]: https://developer.mozilla.org/en-US/docs/Web/HTML/Element/Heading_Elements

…tests, r=Dylan-DPC

Add some regression tests related to rust-lang#82494

Closes rust-lang#75883, closes rust-lang#80779
r? ``@estebank``

Remove extra word in `rustc_mir` docs

Changes "is includes" to "includes" in `rustc_mir::borrow_check::type_check::type_check`.

Remove `DropGuard` in `sys::windows::process` and use `StaticMutex` instead

`StaticMutex` is a mutex that when locked provides a guard that unlocks the mutex again when dropped, thus provides the exact same functionality as `DropGuard`. `StaticMutex` is used in more places, and is thus preferred over an ad-hoc construct like `DropGuard`.

``@rustbot`` label: +T-libs-impl

Update books

## reference

5 commits in e1abb17cd94cd5a8a374b48e1bc8134a2208ed48..d23f9da8469617e6c81121d9fd123443df70595d
2021-04-07 08:09:48 -0700 to 2021-04-28 11:16:44 -0700
- Document or-patterns (rust-lang/reference#957)
- fixed a typo in traits.md (rust-lang/reference#1009)
- Improve clarity and style consistency of crate type list (rust-lang/reference#1005)
- added macro_rules to weak keywords (rust-lang/reference#1008)
- Move non-ascii-idents content from unstable book to reference. (rust-lang/reference#999)

## book

1 commits in b54090a99ec7c4b46a5203a9c927fdbc311bb1f5..50dd06cb71beb27fdc0eebade5509cdcc1f821ed
2021-03-24 11:21:46 -0500 to 2021-04-23 13:21:54 -0500
- Update link in COPYRIGHT (http to https) (rust-lang/book#2704)

## rust-by-example

3 commits in c80f0b09fc15b9251825343be910c08531938ab2..e0a721f5202e6d9bec0aff99f10e44480c0da9e7
2021-04-08 10:28:17 -0300 to 2021-04-27 09:32:15 -0300
- broken long comments in src/types/cast.md to several shortones (rust-lang/rust-by-example#1430)
- Fix link of formatting traits (rust-lang/rust-by-example#1410)
- chore: Fix the indention of Borrowed definition (rust-lang/rust-by-example#1436)

## rustc-dev-guide

8 commits in a9bd2bbf31e4f92b5d3d8e80b22839d0cc7a2022..e72b43a64925ce053dc7830e21c1a57ba00499bd
2021-04-09 18:12:21 -0400 to 2021-04-27 12:35:37 -0700
- Suggest using `git range-diff` (rust-lang/rustc-dev-guide#1092)
- Remove the possible unnecessary flag
- Replace some Travis-related things completely
- Trigger GHA only on the original repo
- Add sample nix shell
- more RA config suggestions (rust-lang/rustc-dev-guide#1114)
- Add Polymorphisation paper (rust-lang/rustc-dev-guide#1093)
- Mention unpretty=mir-cfg for debugging MIR