This makes the macro syntax used in documentation more readable.

Guarantee that when `read_buf_exact` returns, all bytes read will be
appended to the buffer. Including the case when the operations fails.

The motivating use case are operations on a non-blocking reader. When
`read_buf_exact` fails with `ErrorKind::WouldBlock` error, the operation
can be resumed at a later time.

This makes pin docs a little bit less jargon-y and easier to read, by

* splitting up the sentences
* making them less interrupted by punctuation
* turning the footnotes into paragraphs, as they contain useful information
  that shouldn't be hidden in footnotes. Footnotes also interrupt the read flow.
* other improvements and simplifications

…heck, implement const Iterator and DoubleEndedIterator for Range.

…r=the8472,fee1-dead

Allow using `Range` as an `Iterator` in const contexts.

~~based on rust-lang#102225 by `@fee1-dead~~`

…imulacrum

Add note for mismatched types because of circular dependencies

If you have crate A with a dependency on crate B, and crate B with a dev-dependency on A, then you might see "mismatched types" errors on types that seem to be equal. This PR adds a note that explains that the types are different, because crate B is compiled twice, one time with `cfg(test)` and one time without.

I haven't found a good way to create circular dependencies in UI tests, so I abused the incremental tests instead. As a bonus, incremental tests support "cpass" now.

related to rust-lang#22750

…kingjubilee

move default backtrace setting to sys

another PAL exception. moves the default backtrace setting to sys.

…es, r=Mark-Simulacrum

Use Edition 2021 :pat in matches macro

This makes the macro syntax used in documentation more readable.

Beautify pin! docs

This makes pin docs a little bit less jargon-y and easier to read, by

* splitting up the sentences
* making them less interrupted by punctuation
* turning the footnotes into paragraphs, as they contain useful information that shouldn't be hidden in footnotes. Footnotes also interrupt the read flow.

…eexport-lint, r=cjgillot

Add `useless_anonymous_reexport` lint

This is a follow-up of rust-lang#108936. We once again show all anonymous re-exports in rustdoc, however we also wanted to add a lint to let users know that it very likely doesn't have the effect they think it has.

read_buf_exact: on error, all read bytes are appended to the buffer

Guarantee that when `read_buf_exact` returns, all bytes read will be
appended to the buffer. Including the case when the operations fails.

The motivating use case are operations on a non-blocking reader. When
`read_buf_exact` fails with `ErrorKind::WouldBlock` error, the operation
can be resumed at a later time.

…ble, r=estebank

fix: don't suggest similar method when unstable

Fixes rust-lang#109177

Don't display typo suggestions for unstable things, unless the feature flag is enabled.

AFAIK, there are two places this occurs:
- `rustc_resolve`: before type checking, effectively just `FnCtxt::Free`.
- `rustc_hir_typck`: during type checking, for `FnCtxt::Assoc(..)`s.

The linked issue is about the latter, obviously the issue is applicable to both.

r? `@estebank`

…r=petrochenkov

The name of NativeLib will be presented

Fixes rust-lang#109144

I was working on a quick fix, but found change the name from `Option<Symbol>` to `Symbol` make life a little bit easier.

…lstrieb

Implement FixedSizeEncoding for UnusedGenericParams.

Using a `Lazy` for actually a `u32` value is 50% overhead, so let's encode the bitset directly.