Servo has been using this since servo/servo#23196 to add a runtime check to some unsafe code, as discussed in PR rust-lang#59211. Stabilizing would help do more of the same in libraries that also have users on Stable.

…re tests.

…dd `bug!`s to rustc.

Update pre-existing test's diagnostic output accordingly.

Fix rust-lang#61232

This distinguishes `Option` and `Result`-returning doctests with
implicit `main` method, where the former tests must end with
`Some(())`.

This reverts commit e764f47.
Fixes rust-lang#61174.

This commit fixes a ICE where struct constructors were resulting in an
ICE with const generics. Previously, a `match` in `type_of` did not have
an arm for the `DefKind::Ctor` resolutions and therefore would assume
that the type did not have generics.

Ensure that they're all forwards-compatible with AWS updates happening
next year by ensuring the bucket name shows up in the domain name.

Closes rust-lang#61168

Fixes rust-lang#60482.

…laumeGomez

upgrade rustdoc's `pulldown-cmark` to 0.5.2

Fixes rust-lang#60482.

…r, r=varkor

Fix ICE with struct ctors and const generics.

Fixes rust-lang#60818.

r? @varkor

Stabilize RefCell::try_borrow_unguarded

Servo has been using this since servo/servo#23196 to add a runtime check to some unsafe code, as discussed in PR rust-lang#59211. Stabilizing would help do more of the same in libraries that also have users on Stable.

…stic, r=petrochenkov

Fix linkage diagnostic so it doesn't ICE for external crates

Fix linkage diagnostic so it doesn't ICE for external crates

(As a drive-by improvement, improved the diagnostic to indicate *why* `*const T` or `*mut T` is required.)

Fix rust-lang#59548
Fix rust-lang#61232

Box::into_vec: use Box::into_raw instead of mem::forget

`Box::into_raw` does, in one step, turn the `Box` into a raw ptr and avoid deallocation.  Seems cleaner than separating the two.

Also, `mem::forget` gets the `Box` with a `noalias` argument, but it is not actually correct that this is an exclusive pointer. So a stricter version of Stacked Borrows would complain here. (I can't actually make Stacked Borrows that strict yet though due to other issues.)

…s, r=GuillaumeGomez

implicit `Option`-returning doctests

This distinguishes `Option` and `Result`-returning doctests with implicit `main` method, where the former tests must end with `Some(())`.

Open question: Does this need a feature gate?

r? @GuillaumeGomez

Revert "Disable solaris target since toolchain no longer builds"

This reverts commit e764f47.
Fixes rust-lang#61174.

Update all s3 URLs used on CI with subdomains

Ensure that they're all forwards-compatible with AWS updates happening
next year by ensuring the bucket name shows up in the domain name.

Closes rust-lang#61168

…enkov

libsyntax: introduce 'fn is_keyword_ahead(dist, keywords)'.

Introduces:
```rust
    /// Returns whether any of the given keywords are `dist` tokens ahead of the current one.
    fn is_keyword_ahead(&self, dist: usize, kws: &[Symbol]) -> bool {
        self.look_ahead(dist, |t| kws.iter().any(|&kw| t.is_keyword(kw)))
    }
```

r? @oli-obk

…e-cloning, r=alexcrichton

ci: display more debug information in the init_repo script

I'm *really* confused about the error message [while cloning submodules on Windows on Azure](https://dev.azure.com/rust-lang/e71b0ddf-dd27-435a-873c-e30f86eea377/_apis/build/builds/295/logs/506):

```
/usr/bin/tar: You must specify one of the '-Acdtrux', '--delete' or '--test-label' options
Try '/usr/bin/tar --help' or '/usr/bin/tar --usage' for more information.
```

It doesn't make sense for it to execute a command without any of those flags since they're clearly added:

https://github.com/rust-lang/rust/blob/81970852e172c04322cbf8ba23effabeb491c83c/src/ci/init_repo.sh#L45

So this adds `set -x` to the script to hopefully catch what command it's executing.

r? @alexcrichton
cc rust-lang#61301

…bank

Fix ICE with APIT in a function with a const parameter

Fixes rust-lang#60953.