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2025-08-04Fix wrong font being used for tooltips `i` iconsGuillaume Gomez-0/+4
2025-08-02Rollup merge of #144766 - Berrysoft:patch-1, r=GuillaumeGomezSamuel Tardieu-0/+1
Add human readable name "Cygwin" Closes rust-lang/rust#144680
2025-08-02Rollup merge of #143662 - obi1kenobi:pg/unsafe-attribute-wrappers, r=t-rustdocSamuel Tardieu-3/+3
[rustdoc] Display unsafe attrs with edition 2024 `unsafe()` wrappers. Use Rust 2024 edition representation for unsafe attributes in rustdoc HTML: - `#[no_mangle]` -> `#[unsafe(no_mangle)]` - `#[export_name = "foo"]` -> `#[unsafe(export_name = "foo")]` - `#[link_section = ".text"]` -> `#[unsafe(link_section = ".text")]` The 2024 edition representation is used regardless of the crate's own edition. This ensures that Rustaceans don't have to learn the rules of an outdated edition (e.g. that `unsafe()` wasn't always necessary) in order to understand a crate's documentation. After some looking through the `T-rustdoc` issues, I was not able to find an existing issue for this. Apologies if I missed it. r? ``````@aDotInTheVoid``````
2025-08-02Rollup merge of #132748 - ↵Samuel Tardieu-3/+29
lolbinarycat:rustdoc-intra-doc-link-warn-more-54191, r=GuillaumeGomez get rid of some false negatives in rustdoc::broken_intra_doc_links rustdoc will not try to do intra-doc linking if the "path" of a link looks too much like a "real url". however, only inline links (`[text](url)`) can actually contain a url, other types of links (reference links, shortcut links) contain a *reference* which is later resolved to an actual url. the "path" in this case cannot be a url, and therefore it should not be skipped due to looking like a url. fixes https://github.com/rust-lang/rust/issues/54191 to minimize the number of false positives that will be introduced, the following heuristic is used: If there's no backticks, be lenient revert to old behavior. This is to prevent churn by linting on stuff that isn't meant to be a link. only shortcut links have simple enough syntax that they are likely to be written accidentlly, collapsed and reference links need 4 metachars, and reference links will not usually use backticks in the reference name. therefore, only shortcut syntax gets the lenient behavior. here's a truth table for how link kinds that cannot be urls are handled: | | is shortcut link | not shortcut link | |--------------|--------------------|-------------------| | has backtick | never ignore | never ignore | | no backtick | ignore if url-like | never ignore |
2025-08-01rustdoc font links only emit `crossorigin` when neededMingwei Samuel-1/+54
The `crossorigin` attribute may cause issues when the href is not actuall across origins. Specifically, the tag causes the browser to send a preflight OPTIONS request to the href even if it is same-origin. Some tempermental servers may reject all CORS preflect requests even if they're actually same-origin, which causes a CORS error and prevents the fonts from loading, even later on. This commit fixes that problem by not emitting `crossorigin` if the url looks like a domain-relative url. Co-authored-by: Guillaume Gomez <guillaume1.gomez@gmail.com>
2025-08-01Auto merge of #144768 - jhpratt:rollup-otf1yfj, r=jhprattbors-2/+31
Rollup of 7 pull requests Successful merges: - rust-lang/rust#143849 (rustdoc: never link to unnamable items) - rust-lang/rust#144683 (Simplify library dependencies on `compiler-builtins`) - rust-lang/rust#144691 (Extend `is_case_difference` to handle digit-letter confusables) - rust-lang/rust#144700 (rustdoc-json: Move `#[macro_export]` from `Other` to it's own variant) - rust-lang/rust#144751 (Add correct dynamic_lib_extension for aix) - rust-lang/rust#144757 (Ping Muscraft when emitter change) - rust-lang/rust#144759 (triagebot: Label `compiler-builtins` T-libs) r? `@ghost` `@rustbot` modify labels: rollup
2025-08-01Rollup merge of #144700 - aDotInTheVoid:macro-rules-for-macro-fools, ↵Jacob Pratt-2/+6
r=GuillaumeGomez rustdoc-json: Move `#[macro_export]` from `Other` to it's own variant Followup to rust-lang/rust#142936. cargo-semver-checks [cares about this attribute](https://github.com/obi1kenobi/trustfall-rustdoc-adapter/blob/4a0d1b0ca19b3115bb65d0b6695c388d7f474ac9/src/visibility_tracker.rs#L459-L476), and it wasn't included in the initial PR for structured attributes CC `@obi1kenobi.` r? `@GuillaumeGomez`
2025-08-01Rollup merge of #143849 - lolbinarycat:rustdoc-priv-normalize-143222, ↵Jacob Pratt-0/+25
r=GuillaumeGomez rustdoc: never link to unnamable items fixes rust-lang/rust#143222
2025-08-01Auto merge of #144446 - nnethercote:opt-region-constraints, r=lcnrbors-18/+22
Optimize region constraints r? `@lcnr`
2025-08-01Add human readable name "Cygwin"Yuyi Wang-0/+1
2025-07-31Rollup merge of #144726 - jdonszelmann:move-attr-data-structures, r=lcnrJana Dönszelmann-17/+12
merge rustc_attr_data_structures into rustc_hir this move was discussed on zulip: [#t-compiler > attribute parsing rework @ 💬](https://rust-lang.zulipchat.com/#narrow/channel/131828-t-compiler/topic/attribute.20parsing.20rework/near/528530091) Many PRs in the attribute rework depend on this move.
2025-07-31Rollup merge of #144712 - nnethercote:dedup-num-types, r=fmeaseJana Dönszelmann-37/+0
Deduplicate `IntTy`/`UintTy`/`FloatTy`. There are identical definitions in `rustc_type_ir` and `rustc_ast`. This commit removes them and places a single definition in `rustc_ast_ir`. This requires adding `rust_span` as a dependency of `rustc_ast_ir`, but means a bunch of silly conversion functions can be removed. r? `@fmease`
2025-07-31remove rustc_attr_data_structuresJana Dönszelmann-17/+12
2025-07-31Auto merge of #144731 - samueltardieu:rollup-36y30k2, r=samueltardieubors-1/+2
Rollup of 4 pull requests Successful merges: - rust-lang/rust#136840 (Fix linker-plugin-lto only doing thin lto) - rust-lang/rust#144053 (Remove install Rust script from CI) - rust-lang/rust#144297 (Make `libtest::ERROR_EXIT_CODE` const public to not redefine it in rustdoc) - rust-lang/rust#144721 (`std_detect`: Linux 6.16 support for RISC-V) r? `@ghost` `@rustbot` modify labels: rollup
2025-07-31Overhaul `Constraint`.Nicholas Nethercote-18/+22
This commit changes it to store a `Region` instead of a `RegionVid` for the `Var` cases: - We avoid having to call `Region::new_var` to re-create `Region`s from `RegionVid`s in a few places, avoiding the interning process, giving a small perf win. (At the cost of the type allowing some invalid combinations of values.) - All the cases now store two `Region`s, so the commit also separates the `ConstraintKind` (a new type) from the `sub` and `sup` arguments in `Constraint`.
2025-07-31Deduplicate `IntTy`/`UintTy`/`FloatTy`.Nicholas Nethercote-37/+0
There are identical definitions in `rustc_type_ir` and `rustc_ast`. This commit removes them and places a single definition in `rustc_ast_ir`. This requires adding `rust_span` as a dependency of `rustc_ast_ir`, but means a bunch of silly conversion functions can be removed. The one annoying wrinkle is that the old version had differences in their `Debug` impls, e.g. one printed `u32` while the other printed `U32`. Some compiler error messages rely on the former (yuk), and some clippy output depends on the latter. So the commit also changes clippy to not rely on `Debug` and just implement what it needs itself.
2025-07-31Fix CI build failure when using new libtest public constantGuillaume Gomez-2/+3
2025-07-31Make `libtest::ERROR_EXIT_CODE` const public to not redefine it in rustdocGuillaume Gomez-1/+1
2025-07-31Remove `TyCtxt::get_attrs_unchecked`.Nicholas Nethercote-6/+3
It's identical to `TyCtxt::get_all_attrs` except it takes `DefId` instead of `impl Into<DefIf>`.
2025-07-30rustdoc-json: Move `#[macro_export]` from `Other` to it's own variantAlona Enraght-Moony-2/+6
2025-07-30Rollup merge of #144308 - GuillaumeGomez:merged-doctest-times, r=lolbinarycatSamuel Tardieu-18/+77
[rustdoc] Display total time and compilation time of merged doctests Fixes rust-lang/rust#144270. Does it look good to you `@kpreid?` <img width="908" height="263" alt="image" src="https://github.com/user-attachments/assets/cd5d082d-c4e0-42ed-91dd-bd263b413dcd" />
2025-07-30Rollup merge of #143465 - kornelski:extern-name, r=petrochenkovSamuel Tardieu-7/+23
Support multiple crate versions in --extern-html-root-url Rustdoc's `--extern-html-root-url` used to use `tcx.crate_name()` to identify crates, but that used crates' internal names from their metadata, instead of names given to them in `--extern`. That was confusing, because both `--extern…` arguments seem related and use similar syntax. Crucially, this didn't work correctly with Cargo's package aliases or multiple versions of crates. `sess.opts.externs` lacks `CrateNum`, and `Resolver.extern_prelude` gets destroyed before `rustdoc` has a chance to see it, so I've had to save this mapping in `CStore`. Just in case, I've kept the previous mapping by crate name as a fallback for crates that weren't matched by their extern name. Fixes rust-lang/rust#76296
2025-07-29Rollup merge of #144600 - Noratrieb:rustdoc-dep-info-paths, r=GuillaumeGomezStuart Cook-16/+37
Ensure external paths passed via flags end up in rustdoc depinfo rustdoc has many flags to pass external HTML/Markdown/CSS files that end up in the build. These need to be recorded in depinfo so that Cargo will rebuild the crate if they change.
2025-07-28Ensure external paths passed via flags end up in rustdoc depinfoNoratrieb-16/+37
rustdoc has many flags to pass external HTML/Markdown/CSS files that end up in the build. These need to be recorded in depinfo so that Cargo will rebuild the crate if they change.
2025-07-28Support multiple crate versions in --extern-html-root-urlKornel-7/+23
2025-07-28Rollup merge of #144523 - ojeda:rustdoc-target-modifiers, r=GuillaumeGomezMatthias Krüger-0/+6
rustdoc: save target modifiers `rustdoc` was filling a `target_modifiers` variable, but it was not using the result. In turn, that means that trying to use a dependency that set a target modifier fails. For instance, running: ```sh RUSTC_BOOTSTRAP=1 rustc --edition=2024 --target=aarch64-unknown-none-softfloat --sysroot=/dev/null --emit=metadata -Zfixed-x18 --crate-type rlib --crate-name core $(rustc --print sysroot)/lib/rustlib/src/rust/library/core/src/lib.rs echo '#![allow(internal_features)] ' | RUSTC_BOOTSTRAP=1 rustdoc --edition=2021 --target=aarch64-unknown-none-softfloat --sysroot=/dev/null -Zfixed-x18 --extern core=libcore.rmeta - ``` will fail with: ```text error: mixing `-Zfixed-x18` will cause an ABI mismatch in crate `rust_out` | = help: the `-Zfixed-x18` flag modifies the ABI so Rust crates compiled with different values of this flag cannot be used together safely = note: unset `-Zfixed-x18` in this crate is incompatible with `-Zfixed-x18=` in dependency `core` = help: set `-Zfixed-x18=` in this crate or unset `-Zfixed-x18` in `core` = help: if you are sure this will not cause problems, you may use `-Cunsafe-allow-abi-mismatch=fixed-x18` to silence this error ``` Thus save the targets modifiers in `Options` to then pass it to the session options, so that eventually the diff can be performed as expected in `report_incompatible_target_modifiers()`. Cc: ``@azhogin`` Fixes: https://github.com/rust-lang/rust/issues/144521
2025-07-27rustdoc: save target modifiersMiguel Ojeda-0/+6
`rustdoc` was filling a `target_modifiers` variable, but it was not using the result. In turn, that means that trying to use a dependency that set a target modifier fails. For instance, running: ```sh RUSTC_BOOTSTRAP=1 rustc --edition=2024 --target=aarch64-unknown-none-softfloat --sysroot=/dev/null --emit=metadata -Zfixed-x18 --crate-type rlib --crate-name core $(rustc --print sysroot)/lib/rustlib/src/rust/library/core/src/lib.rs echo '#![allow(internal_features)] ' | RUSTC_BOOTSTRAP=1 rustdoc --edition=2021 --target=aarch64-unknown-none-softfloat --sysroot=/dev/null -Zfixed-x18 --extern core=libcore.rmeta - ``` will fail with: ```text error: mixing `-Zfixed-x18` will cause an ABI mismatch in crate `rust_out` | = help: the `-Zfixed-x18` flag modifies the ABI so Rust crates compiled with different values of this flag cannot be used together safely = note: unset `-Zfixed-x18` in this crate is incompatible with `-Zfixed-x18=` in dependency `core` = help: set `-Zfixed-x18=` in this crate or unset `-Zfixed-x18` in `core` = help: if you are sure this will not cause problems, you may use `-Cunsafe-allow-abi-mismatch=fixed-x18` to silence this error ``` Thus save the targets modifiers in `Options` to then pass it to the session options, so that eventually the diff can be performed as expected in `report_incompatible_target_modifiers()`. Fixes: https://github.com/rust-lang/rust/issues/144521 Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
2025-07-26Fix toolingJonathan Brouwer-31/+20
Signed-off-by: Jonathan Brouwer <jonathantbrouwer@gmail.com>
2025-07-26Rollup merge of #141663 - lolbinarycat:rustdoc-collapse-impl-134429, ↵Trevor Gross-6/+22
r=GuillaumeGomez rustdoc: add ways of collapsing all impl blocks either shift+click the Summary button, or use the `_` key. this collapses everything, including (inherent) impl blocks. no need for a special "expand all impl blocks" method, as impl blocks are expanded during regular "expand all". doing "expand all" -> "collapse all" will always result in only impl blocks being expaned. not sure the best way to add a GUI test. fixes https://github.com/rust-lang/rust/issues/134429
2025-07-24rustdoc::broken_intra_doc_links: only be lenient with shortcut linksbinarycat-5/+22
collapsed links and reference links have a pretty particular syntax, it seems unlikely they would show up on accident. Co-authored-by: León Orell Valerian Liehr <me@fmease.dev>
2025-07-24rustdoc::broken_intra_doc_links: no backticks = use old behaviorbinarycat-1/+3
this is in an effort to reduce the amount of code churn caused by this lint triggering on text that was never meant to be a link. a more principled hierustic for ignoring lints is not possible without extensive changes, due to the lint emitting code being so far away from the link collecting code, and the fact that only the link collecting code has access to details about how the link appears in the unnormalized markdown.
2025-07-24get rid of some false negatives in rustdoc::broken_intra_doc_linksbinarycat-3/+10
rustdoc will not try to do intra-doc linking if the "path" of a link looks too much like a "real url". however, only inline links ([text](url)) can actually contain a url, other types of links (reference links, shortcut links) contain a *reference* which is later resolved to an actual url. the "path" in this case cannot be a url, and therefore it should not be skipped due to looking like a url. Co-authored-by: Michael Howell <michael@notriddle.com>
2025-07-24Rollup merge of #144320 - lolbinarycat:rustdoc-search_index-BTreeMap-str, ↵León Orell Valerian Liehr-3/+16
r=GuillaumeGomez rustdoc: avoid allocating a temp String for aliases in search index Here's the optimization I talked about in https://github.com/rust-lang/rust/pull/143988#discussion_r2208524163 I got around the Serialize issue using the newtype pattern. The wrapper type could be factored out into a helper that would work with anything that impls `AsRef<&str>`, but I'm not sure if that would be helpful anywhere else. r? ``````@GuillaumeGomez``````
2025-07-24Rollup merge of #144218 - Noratrieb:target-spec-json-de-jank, r=fee1-deadLeón Orell Valerian Liehr-1/+1
Use serde for target spec json deserialize The previous manual parsing of `serde_json::Value` was a lot of complicated code and extremely error-prone. It was full of janky behavior like sometimes ignoring type errors, sometimes erroring for type errors, sometimes warning for type errors, and sometimes just ICEing for type errors (the icing on the top). Additionally, many of the error messages about allowed values were out of date because they were in a completely different place than the FromStr impls. Overall, the system caused confusion for users. I also found the old deserialization code annoying to read. Whenever a `key!` invocation was found, one had to first look for the right macro arm, and no go to definition could help. This PR replaces all this manual parsing with a 2-step process involving serde. First, the string is parsed into a `TargetSpecJson` struct. This struct is a 1:1 representation of the spec JSON. It already parses all the enums and is very simple to read and write. Then, the fields from this struct are copied into the actual `Target`. The reason for this two-step process instead of just serializing into a `Target` is because of a few reasons 1. There are a few transformations performed between the two formats 2. The default logic is implemented this way. Otherwise all the default field values would have to be spelled out again, which is suboptimal. With this logic, they fall out naturally, because everything in the json struct is an `Option`. Overall, the mapping is pretty simple, with the vast majority of fields just doing a 1:1 mapping that is captured by two macros. I have deliberately avoided making the macros generic to keep them simple. All the `FromStr` impls now have the error message right inside them, which increases the chance of it being up to date. Some "`from_str`" impls were turned into proper `FromStr` impls to support this. The new code is much less involved, delegating all the JSON parsing logic to serde, without any manual type matching. This change introduces a few breaking changes for consumers. While it is possible to use this format on stable, it is very much subject to change, so breaking changes are expected. The hope is also that because of the way stricter behavior, breaking changes are easier to deal with, as they come with clearer error messages. 1. Invalid types now always error, everywhere. Previously, they would sometimes error, and sometimes just be ignored (which meant the users JSON was still broken, just silently!) 2. This now makes use of `deny_unknown_fields` instead of just warning on unused fields, which was done previously. Serde doesn't make it easy to get such warning behavior, which was the primary reason that this now changed. But I think error behavior is very reasonable too. If someone has random stale fields in their JSON, it is likely because these fields did something at some point but no longer do, and the user likely wants to be informed of this so they can figure out what to do. This is also relevant for the future. If we remove a field but someone has it set, it probably makes sense for them to take a look whether they need this and should look for alternatives, or whether they can just delete it. Overall, the JSON is made more explicit. This is the only expected breakage, but there could also be small breakage from small mistakes. All targets roundtrip though, so it can't be anything too major. fixes rust-lang/rust#144153
2025-07-24Display total time and compilation time of merged doctestsGuillaume Gomez-18/+77
2025-07-23[rustdoc] Display unsafe attrs with edition 2024 `unsafe()` wrappers.Predrag Gruevski-3/+3
2025-07-22impl items are never unnamablebinarycat-2/+8
2025-07-22rustdoc: actually never link to unnamable typesbinarycat-7/+18
2025-07-22rustdoc: never try to link to unnamable typesbinarycat-1/+9
2025-07-22rustdoc: avoid allocating a temp String for aliases in search indexbinarycat-3/+16
2025-07-21Use serde for target spec json deserializeNoratrieb-1/+1
The previous manual parsing of `serde_json::Value` was a lot of complicated code and extremely error-prone. It was full of janky behavior like sometimes ignoring type errors, sometimes erroring for type errors, sometimes warning for type errors, and sometimes just ICEing for type errors (the icing on the top). Additionally, many of the error messages about allowed values were out of date because they were in a completely different place than the FromStr impls. Overall, the system caused confusion for users. I also found the old deserialization code annoying to read. Whenever a `key!` invocation was found, one had to first look for the right macro arm, and no go to definition could help. This PR replaces all this manual parsing with a 2-step process involving serde. First, the string is parsed into a `TargetSpecJson` struct. This struct is a 1:1 representation of the spec JSON. It already parses all the enums and is very simple to read and write. Then, the fields from this struct are copied into the actual `Target`. The reason for this two-step process instead of just serializing into a `Target` is because of a few reasons 1. There are a few transformations performed between the two formats 2. The default logic is implemented this way. Otherwise all the default field values would have to be spelled out again, which is suboptimal. With this logic, they fall out naturally, because everything in the json struct is an `Option`. Overall, the mapping is pretty simple, with the vast majority of fields just doing a 1:1 mapping that is captured by two macros. I have deliberately avoided making the macros generic to keep them simple. All the `FromStr` impls now have the error message right inside them, which increases the chance of it being up to date. Some "`from_str`" impls were turned into proper `FromStr` impls to support this. The new code is much less involved, delegating all the JSON parsing logic to serde, without any manual type matching. This change introduces a few breaking changes for consumers. While it is possible to use this format on stable, it is very much subject to change, so breaking changes are expected. The hope is also that because of the way stricter behavior, breaking changes are easier to deal with, as they come with clearer error messages. 1. Invalid types now always error, everywhere. Previously, they would sometimes error, and sometimes just be ignored (which meant the users JSON was still broken, just silently!) 2. This now makes use of `deny_unknown_fields` instead of just warning on unused fields, which was done previously. Serde doesn't make it easy to get such warning behavior, which was the primary reason that this now changed. But I think error behavior is very reasonable too. If someone has random stale fields in their JSON, it is likely because these fields did something at some point but no longer do, and the user likely wants to be informed of this so they can figure out what to do. This is also relevant for the future. If we remove a field but someone has it set, it probably makes sense for them to take a look whether they need this and should look for alternatives, or whether they can just delete it. Overall, the JSON is made more explicit. This is the only expected breakage, but there could also be small breakage from small mistakes. All targets roundtrip though, so it can't be anything too major.
2025-07-20Rollup merge of #143988 - GuillaumeGomez:alias-inexact, r=lolbinarycatMatthias Krüger-74/+85
[rustdoc] Make aliases search support partial matching Fixes rust-lang/rust#140782. To make this work, I moved aliases into the `searchIndex` like any other item. It links to the "original" item with a new `original` field. No so great part is that we need to have some fields like `bitIndex` to be set on the alias to make the description load to work but I consider it minor enough to be ok. This PR voluntarily doesn't handle de-prioritization of aliases as ```@lolbinarycat``` wished to work on this so I'll leave them this part. :wink: cc ```@lolbinarycat```
2025-07-19Add code comment explaining better what `Row.name` is for doc aliasesGuillaume Gomez-0/+2
2025-07-19Fix clippy lints in librustdocGuillaume Gomez-174/+154
2025-07-17Include ErrorGuaranteed in StableSince::Err.Camille GILLOT-1/+1
2025-07-17parse `const trait Trait`Deadbeef-2/+2
2025-07-17Auto merge of #144044 - fmease:rollup-kg413pt, r=fmeasebors-57/+33
Rollup of 15 pull requests Successful merges: - rust-lang/rust#142304 (tests: Add `RUST_BACKTRACE` and `-Cpanic` revisions to `panic-main.rs` test) - rust-lang/rust#143388 (Various refactors to the LTO handling code) - rust-lang/rust#143409 (Enable xgot feature for mips64 musl targets) - rust-lang/rust#143592 (UWP: link ntdll functions using raw-dylib) - rust-lang/rust#143595 (add `const_make_global`; err for `const_allocate` ptrs if didn't call) - rust-lang/rust#143678 (Added error for invalid char cast) - rust-lang/rust#143820 (Fixed a core crate compilation failure when enabling the `optimize_for_size` feature on some targets) - rust-lang/rust#143829 (Trim `BorrowedCursor` API) - rust-lang/rust#143851 (ci cleanup: rustdoc-gui-test now installs browser-ui-test) - rust-lang/rust#143856 (Linting public reexport of private dependencies) - rust-lang/rust#143895 (Dont collect assoc ty item bounds from trait where clause for host effect predicates) - rust-lang/rust#143922 (Improve path segment joining) - rust-lang/rust#143964 (Fix handling of SCRIPT_ARG in docker images) - rust-lang/rust#144002 (Update poison.rs) - rust-lang/rust#144016 (trait_sel: `MetaSized` always holds temporarily) r? `@ghost` `@rustbot` modify labels: rollup
2025-07-17Auto merge of #140399 - tiif:unstable_impl, r=lcnr,BoxyUwUbors-1/+2
Implement unstable trait impl This PR allows marking impls of stable trait with stable type as unstable. ## Approach In std/core, an impl can be marked as unstable by annotating it with ``#[unstable_feature_bound(feat_name)]``. This will add a ``ClauseKind::Unstable_Feature(feat_name)`` to the list of predicates in ``predicates_of`` . When an unstable impl's function is called, we will first iterate through all the goals in ``param_env`` to check if there is any ``ClauseKind::UnstableFeature(feat_name)`` in ``param_env``. The existence of ``ClauseKind::Unstable_Feature(feat_name)`` in ``param_env`` means an``#[unstable_feature_bound(feat_name)]`` is present at the call site of the function, so we allow the check to succeed in this case. If ``ClauseKind::UnstableFeature(feat_name)`` does not exist in ``param_env``, we will still allow the check to succeed for either of the cases below: 1. The feature is enabled through ``#[feature(feat_name)]`` outside of std / core. 2. We are in codegen because we may be monomorphizing a body from an upstream crate which had an unstable feature enabled that the downstream crate do not. For the rest of the case, it will fail with ambiguity. ## Limitation In this PR, we do not support: 1. using items that need ``#[unstable_feature_bound]`` within stable APIs 2. annotate main function with ``#[unstable_feature_bound]`` 3. annotate ``#[unstable_feature_bound]`` on items other than free function and impl ## Acknowledgement The design and mentoring are done by `@BoxyUwU`
2025-07-17Improve path segment joining.Nicholas Nethercote-57/+33
There are many places that join path segments with `::` to produce a string. A lot of these use `join("::")`. Many in rustdoc use `join_with_double_colon`, and a few use `.joined("..")`. One in Clippy uses `itertools::join`. A couple of them look for `kw::PathRoot` in the first segment, which can be important. This commit introduces `rustc_ast::join_path_{syms,ident}` to do the joining for everyone. `rustc_ast` is as good a location for these as any, being the earliest-running of the several crates with a `Path` type. Two functions are needed because `Ident` printing is more complex than simple `Symbol` printing. The commit also removes `join_with_double_colon`, and `estimate_item_path_byte_length` with it. There are still a handful of places that join strings with "::" that are unchanged. They are not that important: some of them are in tests, and some of them first split a path around "::" and then rejoin with "::". This fixes one test case where `{{root}}` shows up in an error message.
2025-07-16Make aliases search support partial matchingGuillaume Gomez-74/+83