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This introduce an additional collection of opaques on HIR, as they can no
longer be listed using the free item list.
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This allows the visitor to borrow from the visitees.
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Generate scraped examples buttons in JS
Follow-up of https://github.com/rust-lang/rust/pull/129796.
To reduce the page size when there are scraped examples, we can generate their buttons in JS since they require JS to work in any case. There should be no changes in display or in functionality.
You can test it [here](https://rustdoc.crud.net/imperio/gen-scraped-buttons/doc/scrape_examples/fn.test.html).
cc `@willcrichton`
r? `@notriddle`
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- Replace non-standard names like 's, 'p, 'rg, 'ck, 'parent, 'this, and
'me with vanilla 'a. These are cases where the original name isn't
really any more informative than 'a.
- Replace names like 'cx, 'mir, and 'body with vanilla 'a when the lifetime
applies to multiple fields and so the original lifetime name isn't
really accurate.
- Put 'tcx last in lifetime lists, and 'a before 'b.
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rustdoc rfc#3662 changes under unstable flags
* All new functionality is under unstable options
* Adds `--merge=shared|none|finalize` flags
* Adds `--parts-out-dir=<crate specific directory>` for `--merge=none`
to write cross-crate info file for a single crate
* Adds `--include-parts-dir=<previously specified directory>` for
`--merge=finalize` to write cross-crate info files
* `tests/rustdoc/` tests for the new flags
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* All new functionality is under unstable options
* Adds `--merge=shared|none|finalize` flags
* Adds `--parts-out-dir=<crate specific directory>` for `--merge=none`
to write cross-crate info file for a single crate
* Adds `--include-parts-dir=<previously specified directory>` for
`--merge=finalize` to write cross-crate info files
* update tests/run-make/rustdoc-default-output/rmake.rs golden
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Use `DeepRejectCtxt` to quickly reject `ParamEnv` candidates
The description is on the [zulip thread](https://rust-lang.zulipchat.com/#narrow/stream/144729-t-types/topic/.5Basking.20for.20help.5D.20.60DeepRejectCtxt.60.20for.20param.20env.20candidates)
r? `@lcnr`
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Unify scraped examples with other code examples
Fixes #129763.
This first PR both fixes #129763 but also unifies buttons display for code examples:
You can test it [here](https://rustdoc.crud.net/imperio/unify-code-examples/doc/scrape_examples/fn.test.html) and [here](https://rustdoc.crud.net/imperio/unify-code-examples/doc/scrape_examples/fn.test_many.html).
I'm planning to send a follow-up to make the buttons generated in JS directly (or I can do it in this PR directly if you prefer).
cc ```@willcrichton```
r? ```@notriddle```
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rustdoc: add header map to the table of contents
## Summary
Add header sections to the sidebar TOC.
### Preview
* http://notriddle.com/rustdoc-html-demo-9/toc/rust/std/index.html
* http://notriddle.com/rustdoc-html-demo-9/toc/rust-derive-builder/derive_builder/index.html
## Motivation
Some pages are very wordy, like these.
| crate | word count |
|--|--|
| [std::option](https://doc.rust-lang.org/stable/std/option/index.html) | 2,138
| [derive_builder](https://docs.rs/derive_builder/0.13.0/derive_builder/index.html) | 2,403
| [tracing](https://docs.rs/tracing/0.1.40/tracing/index.html) | 3,912
| [regex](https://docs.rs/regex/1.10.3/regex/index.html) | 8,412
This kind of very long document is more navigable with a table of contents, like Wikipedia's or the one [GitHub recently added](https://github.blog/changelog/2021-04-13-table-of-contents-support-in-markdown-files/) for READMEs.
In fact, the use case is so compelling, that it's been requested multiple times and implemented in an extension:
* https://github.com/rust-lang/rust/issues/80858
* https://github.com/rust-lang/rust/issues/28056
* https://github.com/rust-lang/rust/issues/14475
* https://rust.extension.sh/#show-table-of-content
(Some of these issues ask for more than this, so don’t close them.)
It's also been implemented by hand in some crates, because the author really thought it was needed. Protip: for a more exhaustive list, run [`site:docs.rs table of contents`](https://duckduckgo.com/?t=ffab&q=site%3Adocs.rs+table+of+contents&ia=web), though some of them are false positives.
* https://docs.rs/figment/0.10.14/figment/index.html#table-of-contents
* https://docs.rs/csv/1.3.0/csv/tutorial/index.html#table-of-contents
* https://docs.rs/axum/0.7.4/axum/response/index.html#table-of-contents
* https://docs.rs/regex-automata/0.4.5/regex_automata/index.html#table-of-contents
Unfortunately for these hand-built ToCs, because they're just part of the docs, there's no consistent way to turn them off if the reader doesn't want them. It's also more complicated to ensure they stay in sync with the docs they're supposed to describe, and they don't stay with you when you scroll like Wikipedia's [does now](https://uxdesign.cc/design-notes-on-the-2023-wikipedia-redesign-d6573b9af28d).
## Guide-level explanation
When writing docs for a top-level item, the first and second level of headers will be shown in an outline in the sidebar. In this context, "top level" means "not associated".
This means, if you're writing very long guides or explanations, and you want it to have a table of contents in the sidebar for its headings, the ideal place to attach it is usually the *module* or *crate*, because this page has fewer other things on it (and is the ideal place to describe "cross-cutting concerns" for its child items).
If you're reading documentation, and want to get rid of the table of contents, open the  Settings panel and checkmark "Hide table of contents."
## Reference-level explanation
Top-level items have an outline generated. This works for potentially-malformed header trees by pairing a header with the nearest header with a higher level. For example:
```markdown
## A
# B
# C
## D
## E
```
A, B, and C are all siblings, and D and E are children of C.
Rustdoc only presents two layers of tree, but it tracks up to the full depth of 6 while preparing it.
That means that these two doc comment both generate the same outline:
```rust
/// # First
/// ## Second
struct One;
/// ## First
/// ### Second
struct Two;
```
## Drawbacks
The biggest drawback is adding more stuff to the sidebar.
My crawl through docs.rs shows this to, surprisingly, be less of a problem than I thought. The manually-built tables of contents, and the pages with dozens of headers, usually seem to be modules or crates, not types (where extreme scrolling would become a problem, since they already have methods to deal with).
The best example of a type with many headers is [vec::Vec](https://doc.rust-lang.org/1.75.0/std/vec/struct.Vec.html), which still only has five headers, not dozens like [axum::extract](https://docs.rs/axum/0.7.4/axum/extract/index.html).
## Rationale and alternatives
### Why in the existing sidebar?
The method links and the top-doc header links have more in common with each other than either of them do with the "In [parent module]" links, and should go together.
### Why limited to two levels?
The sidebar is pretty narrow, and I don't want too much space used by indentation. Making the sidebar wider, while it has some upsides, also takes up more space on middling-sized screens or tiled WMs.
### Why not line wrap?
That behaves strangely when resizing.
## Prior art
### Doc generators that have TOC for headers
https://hexdocs.pm/phoenix/Phoenix.Controller.html is very close, in the sense that it also has header sections directly alongside functions and types.
Another example, referenced as part of the [early sidebar discussion](https://github.com/rust-lang/rust/issues/37856) that added methods, Ruby will show a table of contents in the sidebar (for example, on the [ARGF](https://docs.ruby-lang.org/en/master/ARGF.html) class). According to their changelog, [they added it in 2013](https://github.com/ruby/rdoc/blob/06137bde8ccc48cd502bc28178bcd8f2dfe37624/History.rdoc#400--2013-02-24-).
Haskell seems to mix text and functions even more freely than Elixir. For example, this [Naming conventions](https://hackage.haskell.org/package/base-4.19.0.0/docs/Control-Monad.html#g:3) is plain text, and is immediately followed by functions. And the [Pandoc top level](https://hackage.haskell.org/package/pandoc-3.1.11.1/docs/Text-Pandoc.html) has items split up by function, rather than by kind. Their TOC matches exactly with the contents of the page.
### Doc generators that don't have header TOC, but still have headers
Elm, interestingly enough, seems to have the same setup that Rust used to have: sibling navigation between modules, and no index within a single page. [They keep Haskell's habit of named sections with machine-generated type signatures](https://package.elm-lang.org/packages/elm/browser/latest/Browser-Dom), though.
[PHP](https://www.php.net/manual/en/book.datetime.php), like elm, also has a right-hand sidebar with sibling navigation. However, PHP has a single page for a single method, unlike Rust's page for an entire "class." So even though these pages have headers, it's never more than ten at most. And when they have guides, those guides are also multi-page.
## Unresolved questions
* Writing recommendations for anyone who wants to take advantage of this.
* Right now, it does not line wrap. That might be a bad idea: a lot of these are getting truncated.
* Split sidebars, which I [tried implementing](https://rust-lang.zulipchat.com/#narrow/stream/266220-t-rustdoc/topic/Table.20of.20contents), are not required. The TOC can be turned off, if it's really a problem. Implemented in https://github.com/rust-lang/rust/pull/120818, but needs more, separate, discussion.
## Future possibilities
I would like to do a better job of distinguishing global navigation from local navigation. Rustdoc has a pretty reasonable information architecture, if only we did a better job of communicating it.
This PR aims, mostly, to help doc authors help their users by writing docs that can be more effectively skimmed. But it doesn't do anything to make it easier to tell the TOC and the Module Nav apart.
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doc: Make block of inline Deref methods foldable
After:
Before:
Fix #127470.
Current status:
- [x] Bug when hovering over title "Methods from ...": The anchor sign $ overlaps with `[-]`: https://github.com/rust-lang/rust/pull/127474#issuecomment-2222930038
=> Fixed by https://github.com/rust-lang/rust/pull/127474#issuecomment-2228886292
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r=GuillaumeGomez
Remove `#[macro_use] extern crate tracing` from rustdoc and rustfmt
A follow-up to #129767 and earlier PRs doing this for `rustc_*` crates.
r? ```@GuillaumeGomez```
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Fixes a regression introduced in #128252.
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File size
---------
```console
$ du -hs doc.old/search-index1.82.0.js doc/search-index1.82.0.js
3.2M doc.old/search-index1.82.0.js
2.8M doc/search-index1.82.0.js
$ gzip doc/search-index1.82.0.js
$ gzip doc.old/search-index1.82.0.js
$ du -hs doc.old/search-index1.82.0.js.gz doc/search-index1.82.0.js.gz
464K doc.old/search-index1.82.0.js.gz
456K doc/search-index1.82.0.js.gz
$ du -hs compiler-doc.old/search-index.js compiler-doc/search-index.js
8.5M compiler-doc.old/search-index.js
6.5M compiler-doc/search-index.js
$ gzip compiler-doc/search-index1.82.0.js
$ gzip compiler-doc.old/search-index1.82.0.js
$ du -hs compiler-doc.old/search-index.js.gz compiler-doc/search-index.js.gz
1.4M compiler-doc.old/search-index.js.gz
1.4M compiler-doc/search-index.js.gz
```
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This commit adds the headers for the top level documentation to
rustdoc's existing table of contents, along with associated items.
It only show two levels of headers. Going further would require the
sidebar to be wider, and that seems unnecessary (the crates that
have manually-built TOCs usually don't need deeply nested headers).
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modularize rustdoc's write_shared
Refactor src/librustdoc/html/render/write_shared.rs to reduce code duplication, adding unit tests
* Extract + unit test code for sorting and rendering JSON, which is duplicated 9 times in the current impl
* Extract + unit test code for encoding JSON as single quoted strings, which is duplicated twice in the current impl
* Unit tests for cross-crate information file formats
* Generic interface to add new kinds of cross-crate information files in the future
* Intended to match current behavior exactly, except for a merge info comment it adds to the bottom of cci files
* This PR is intended to reduce the review burden from my [mergeable rustdoc rfc](https://github.com/rust-lang/rfcs/pull/3662) implementation PR, which is a [small commit based on this branch](https://github.com/EtomicBomb/rust/tree/rfc). This code is agnostic to the RFC and does not include any of the flags discussed there, but cleanly enables the addition of these flags in the future because it is more modular
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typos in comments, remove references to crate-info, Self type in
ordered_json and sorted_template
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It was barely used, and the places that used it are actually clearer
without it since they were often undoing some of its work. This also
avoids an unnecessary clone of the receiver type and removes a layer of
logical indirection in the code.
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This is much more readable and idiomatic, and also may help performance
since `match`es usually use switches while `if`s may not.
I also fixed an incorrect comment.
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We already have special-cased code to handle inlining `Self` as the type
or trait it refers to, and this was just causing glitches like the
search `A -> B` yielding blanket `Into` impls.
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Rustdoc often has to special-case `Self` because it is, well, a special
type of generic parameter (although it also behaves as an alias in
concrete impls). Instead of spreading this special-casing throughout the
code base, create a new variant of the `clean::Type` enum that is for
`Self` types.
This is a refactoring that has almost no impact on rustdoc's behavior,
except that `&Self`, `(Self,)`, `&[Self]`, and other similar occurrences
of `Self` no longer link to the wrapping type (reference primitive,
tuple primitive, etc.) as regular generics do. I felt this made more
sense since users would expect `Self` to link to the containing trait or
aliased type (though those are usually expanded), not the primitive that
is wrapping it. For an example of the change, see the docs for
`std::alloc::Allocator::by_ref`.
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`SelfTy` makes it sound like it is literally the `Self` type, whereas in
fact it may be `&Self` or other types. Plus, I want to use the name
`SelfTy` for a new variant of `clean::Type`. Having both causes
resolution conflicts or at least confusion.
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