Replaces simple bool `match`es of the form

    match $expr {
        $pattern => true
        _ => false
    }

and their inverse with invocations of the matches! macro.

…ant in the language.

(Note that the fact this test existed is a slight sign that we may need a crater
run on this bugfix...)

That is, this changes `#[forbid(foo)] #[allow(foo)]` from allowing foo to
forbidding foo.

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

Fixes rust-lang#77523

Now that hygiene serialization is implemented, we also need to record
`expansion_that_defined` so that we properly handle a foreign
`SyntaxContext`.

- Move `cfg(doc)` out of `unstable-features`. It's not unstable.
- Remove outdated reference to `everybody_loops`.
- Improve wording in various places
- Give an example of code this allows (and does not allow)
- Link to `cfg(doc)` in `doc(cfg)` documentation. Since one is stable
and the other is not, don't combine them.
- Cleanup wording for `doc(cfg)`
- Incorporate changes from rust-lang#76849
- Mention that `doc(cfg)` is also for features

…anic, r=KodrAus

Add a note about the panic behavior of math operations on time objects

Fixes rust-lang#71226.

Revamp rustdoc docs about documentation using `cfg`

- Move `cfg(doc)` out of `unstable-features`. It's not unstable.
- Remove outdated reference to `everybody_loops`.
- Improve wording in various places
- Give an example of code this allows (and does not allow)
- Link to `cfg(doc)` in `doc(cfg)` documentation. Since one is stable
and the other is not, don't combine them.
- Cleanup wording for `doc(cfg)`
- Incorporate changes from rust-lang#76849
- Mention that `doc(cfg)` is also for features

Addresses rust-lang#76849 (comment).
Obsoletes rust-lang#76849 (I made sure to fix the weird dashes too).
r? @steveklabnik

Reduce boilerplate with the matches! macro

Replaces simple bool `match`es of the form

    match $expr {
        $pattern => true
        _ => false
    }

and their inverse with invocations of the matches! macro.

Limited to rustc_middle for now to get my feet wet.

…, r=pickfire

Add missing examples for MaybeUninit

r? @Dylan-DPC

…lnay

Avoid unchecked casts in net parser

Once this and rust-lang#77426 are in, I'll send another PR adding scope id parsing.

r? @dtolnay

…w-override-forbid-in-same-scope, r=petrochenkov

Disallow overriding forbid in same scope

Rebased rust-lang#73379.

Fixes rust-lang#70819.

Allow anyone to set regression labels

Cc https://rust-lang.zulipchat.com/#narrow/stream/241545-t-release/topic/improve.20reporting.20of.20regressions/near/212245535

r? @Mark-Simulacrum

…yn514

Rename bootstrap/defaults/{config.toml.PROFILE => config.PROFILE.toml}

This allows these files to have okay syntax highlighting in editors, and helps avoid nagging from editors which want to suggest that I install a plugin for `*.library` files to view the `config.toml.library` or whatever.

It's a very minor change.

r?@jyn514

…d-rust-syntax, r=lcnr

Fix rustdoc warnings about invalid Rust syntax

Fix LitKind's byte buffer to use refcounted slice

While working on adding a new lint for clippy (see rust-lang/rust-clippy#6044) for avoiding shared ownership of "mutable buffer" types (such as using `Rc<Vec<T>>` instead of `Rc<[T]>`), I noticed a type exported from rustc_ast and used by clippy gets caught by the lint. This PR fixes the exported type.

This PR includes the actual change to clippy too, but I will open a PR directly against clippy for that part (although it will currently fail to build there).

Hint doc use convert::identity relative link

r? @jyn514

…ic-morse

Fix span for unicode escape suggestion.

If a unicode escape is missing the curly braces, the suggested fix is to add the curly braces, but the span for the fix was incorrect. It was not covering the `\u`, but the suggested text includes the `\u`, causing the resulting fix to be `"\u\u{1234}"`. This changes it so that the span includes the `\u`. An alternate fix would be to remove `\u` from the suggested fix, but I think the error message reads better if the entire escape is included.

…estebank

Record `expansion_that_defined` into crate metadata

Fixes rust-lang#77523

Now that hygiene serialization is implemented, we also need to record
`expansion_that_defined` so that we properly handle a foreign
`SyntaxContext`.