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Rollup of 28 pull requests
Successful merges:
- rust-lang/rust#132087 (Fix overly restrictive lifetime in `core::panic::Location::file` return type)
- rust-lang/rust#137396 (Recover `param: Ty = EXPR`)
- rust-lang/rust#137457 (Fix host code appearing in Wasm binaries)
- rust-lang/rust#142185 (Convert moves of references to copies in ReferencePropagation)
- rust-lang/rust#144648 (Implementation: `#[feature(nonpoison_rwlock)]`)
- rust-lang/rust#144897 (print raw lifetime idents with r#)
- rust-lang/rust#145218 ([Debuginfo] improve enum value formatting in LLDB for better readability)
- rust-lang/rust#145380 (Add codegen-llvm regression tests)
- rust-lang/rust#145573 (Add an experimental unsafe(force_target_feature) attribute.)
- rust-lang/rust#145597 (resolve: Remove `ScopeSet::Late`)
- rust-lang/rust#145633 (Fix some typos in LocalKey documentation)
- rust-lang/rust#145641 (On E0277, point at type that doesn't implement bound)
- rust-lang/rust#145669 (rustdoc-search: GUI tests check for `//` in URL)
- rust-lang/rust#145695 (Introduce ProjectionElem::try_map.)
- rust-lang/rust#145710 (Fix the ABI parameter inconsistency issue in debug.rs for LoongArch64)
- rust-lang/rust#145726 (Experiment: Reborrow trait)
- rust-lang/rust#145731 (Make raw pointers work in type-based search)
- rust-lang/rust#145736 (triagebot: Update style team reviewers)
- rust-lang/rust#145738 (Uplift rustc_mir_transform::coverage::counters::union_find to rustc_data_structures.)
- rust-lang/rust#145742 (rustdoc js: Even more typechecking improvments )
- rust-lang/rust#145743 (doc: fix some typos in comment)
- rust-lang/rust#145745 (tests: Ignore basic-stepping.rs on LoongArch)
- rust-lang/rust#145747 (Refactor lint buffering to avoid requiring a giant enum)
- rust-lang/rust#145751 (fix(lexer): Allow '-' in the frontmatter infostring continue set)
- rust-lang/rust#145761 (Add aarch64_be-unknown-hermit target)
- rust-lang/rust#145762 (convert strings to symbols in attr diagnostics)
- rust-lang/rust#145763 (Ship LLVM tools for the correct target when cross-compiling)
- rust-lang/rust#145765 (Revert suggestions for missing methods in tuples)
r? `@ghost`
`@rustbot` modify labels: rollup
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Revert suggestions for missing methods in tuples
As requested by `@estebank` and as discussed with `@jackh726,` this reverts rust-lang/rust#142034 because of diagnostics ICEs like rust-lang/rust#142488 and its duplicates that have reached stable by now.
We will work on a proper fix to reland this cool work in the near future, but in the meantime, a revert is safer to validate and backport to beta and stable, so here it is.
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Add aarch64_be-unknown-hermit target
Follow-up to rust-lang/rust#144962, which added the target necessary to build the Hermit bootloader and kernel for `aarch64_be`. This adds the target for Rust applications that can run in Hermit.
I've been testing this for a while now and `@mkroening` and `@stlankes` are on board with adding this target.
About the [tier 3 target policy](https://doc.rust-lang.org/rustc/target-tier-policy.html#tier-3-target-policy):
> - A tier 3 target must have a designated developer or developers (the "target maintainers") on record to be CCed when issues arise regarding the target. (The mechanism to track and CC such developers may evolve over time.)
The maintainers for this target are the same as for the other Hermit targets, `@mkroening` and `@stlankes.`
> - Targets must use naming consistent with any existing targets; for instance, a target for the same CPU or OS as an existing Rust target should use the same name for that CPU or OS. Targets should normally use the same names and naming conventions as used elsewhere in the broader ecosystem beyond Rust (such as in other toolchains), unless they have a very good reason to diverge. Changing the name of a target can be highly disruptive, especially once the target reaches a higher tier, so getting the name right is important even for a tier 3 target.
> - Target names should not introduce undue confusion or ambiguity unless absolutely necessary to maintain ecosystem compatibility. For example, if the name of the target makes people extremely likely to form incorrect beliefs about what it targets, the name should be changed or augmented to disambiguate it.
> - If possible, use only letters, numbers, dashes and underscores for the name. Periods (.) are known to cause issues in Cargo.
The target name is consistent with the existing `aarch64-unknown-hermit` target and the existing big endian aarch64 targets like `aarch64_be-unknown-linux-gnu`.
> - Tier 3 targets may have unusual requirements to build or use, but must not create legal issues or impose onerous legal terms for the Rust project or for Rust developers or users.
> - The target must not introduce license incompatibilities.
> - Anything added to the Rust repository must be under the standard Rust license (MIT OR Apache-2.0).
> - The target must not cause the Rust tools or libraries built for any other host (even when supporting cross-compilation to the target) to depend on any new dependency less permissive than the Rust licensing policy. This applies whether the dependency is a Rust crate that would require adding new license exceptions (as specified by the tidy tool in the rust-lang/rust repository), or whether the dependency is a native library or binary. In other words, the introduction of the target must not cause a user installing or running a version of Rust or the Rust tools to be subject to any new license requirements.
> - Compiling, linking, and emitting functional binaries, libraries, or other code for the target (whether hosted on the target itself or cross-compiling from another target) must not depend on proprietary (non-FOSS) libraries. Host tools built for the target itself may depend on the ordinary runtime libraries supplied by the platform and commonly used by other applications built for the target, but those libraries must not be required for code generation for the target; cross-compilation to the target must not require such libraries at all. For instance, rustc built for the target may depend on a common proprietary C runtime library or console output library, but must not depend on a proprietary code generation library or code optimization library. Rust's license permits such combinations, but the Rust project has no interest in maintaining such combinations within the scope of Rust itself, even at tier 3.
> - "onerous" here is an intentionally subjective term. At a minimum, "onerous" legal/licensing terms include but are not limited to: non-disclosure requirements, non-compete requirements, contributor license agreements (CLAs) or equivalent, "non-commercial"/"research-only"/etc terms, requirements conditional on the employer or employment of any particular Rust developers, revocable terms, any requirements that create liability for the Rust project or its developers or users, or any requirements that adversely affect the livelihood or prospects of the Rust project or its developers or users.
There are no licensing issues or proprietary components required to compile for this target.
> - Neither this policy nor any decisions made regarding targets shall create any binding agreement or estoppel by any party. If any member of an approving Rust team serves as one of the maintainers of a target, or has any legal or employment requirement (explicit or implicit) that might affect their decisions regarding a target, they must recuse themselves from any approval decisions regarding the target's tier status, though they may otherwise participate in discussions.
> - This requirement does not prevent part or all of this policy from being cited in an explicit contract or work agreement (e.g. to implement or maintain support for a target). This requirement exists to ensure that a developer or team responsible for reviewing and approving a target does not face any legal threats or obligations that would prevent them from freely exercising their judgment in such approval, even if such judgment involves subjective matters or goes beyond the letter of these requirements.
Ack.
> - Tier 3 targets should attempt to implement as much of the standard libraries as possible and appropriate (core for most targets, alloc for targets that can support dynamic memory allocation, std for targets with an operating system or equivalent layer of system-provided functionality), but may leave some code unimplemented (either unavailable or stubbed out as appropriate), whether because the target makes it impossible to implement or challenging to implement. The authors of pull requests are not obligated to avoid calling any portions of the standard library on the basis of a tier 3 target not implementing those portions.
This target implements std with the same featureset as `aarch64-unknown-hermit`.
> - The target must provide documentation for the Rust community explaining how to build for the target, using cross-compilation if possible. If the target supports running binaries, or running tests (even if they do not pass), the documentation must explain how to run such binaries or tests for the target, using emulation if possible or dedicated hardware if necessary.
Ack, that is part of the markdown document.
> - Tier 3 targets must not impose burden on the authors of pull requests, or other developers in the community, to maintain the target. In particular, do not post comments (automated or manual) on a PR that derail or suggest a block on the PR based on a tier 3 target. Do not send automated messages or notifications (via any medium, including via `@)` to a PR author or others involved with a PR regarding a tier 3 target, unless they have opted into such messages.
> - Backlinks such as those generated by the issue/PR tracker when linking to an issue or PR are not considered a violation of this policy, within reason. However, such messages (even on a separate repository) must not generate notifications to anyone involved with a PR who has not requested such notifications.
Ack.
> - Patches adding or updating tier 3 targets must not break any existing tier 2 or tier 1 target, and must not knowingly break another tier 3 target without approval of either the compiler team or the maintainers of the other tier 3 target.
> - In particular, this may come up when working on closely related targets, such as variations of the same architecture with different features. Avoid introducing unconditional uses of features that another variation of the target may not have; use conditional compilation or runtime detection, as appropriate, to let each target run code supported by that target.
This doesn't break any existing targets.
> - Tier 3 targets must be able to produce assembly using at least one of rustc's supported backends from any host target. (Having support in a fork of the backend is not sufficient, it must be upstream.)
The LLVM backend works.
> - If a tier 3 target stops meeting these requirements, or the target maintainers no longer have interest or time, or the target shows no signs of activity and has not built for some time, or removing the target would improve the quality of the Rust codebase, we may post a PR to remove it; any such PR will be CCed to the target maintainers (and potentially other people who have previously worked on the target), to check potential interest in improving the situation.
Ack.
r? compiler_leads
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fix(lexer): Allow '-' in the frontmatter infostring continue set
This more closely matches the RFC and what our T-lang contact has asked
for, see https://github.com/rust-lang/rust/issues/136889#issuecomment-3212715312
Tracking issue: rust-lang/rust#136889
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tests: Ignore basic-stepping.rs on LoongArch
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lolbinarycat:rustdoc-search-generic-pointer-142385, r=notriddle
Make raw pointers work in type-based search
fixes rust-lang/rust#142385
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Experiment: Reborrow trait
Tracking issue: rust-lang/rust#145612
Starting off really small here: just introduce the unstable feature and the feature gate, and one of the two traits that the Reborrow experiment deals with.
### Cliff-notes explanation
The `Reborrow` trait is conceptually a close cousin of `Copy` with the exception that it disables the source (`self`) for the lifetime of the target / result of the reborrow action. It can be viewed as a method of `fn reborrow(self: Self<'a>) -> Self<'a>` with the compiler adding tracking of the resulting `Self<'a>` (or any value derived from it that retains the `'a` lifetime) to keep the `self` disabled for reads and writes.
No method is planned to be surfaced to the user, however, as reborrowing cannot be seen in code (except for method calls [`a.foo()` reborrows `a`] and explicit reborrows [`&*a`]) and thus triggering user-code in it could be viewed as "spooky action at a distance". Furthermore, the added compiler tracking cannot be seen on the method itself, violating the Golden Rule. Note that the userland "reborrow" method is not True Reborrowing, but rather a form of a "Fancy Deref":
```rust
fn reborrow(&'short self: Self<'long>) -> Self<'short>;
```
The lifetime shortening is the issue here: a reborrowed `Self` or any value derived from it is bound to the method that called `reborrow`, since `&'short` is effectively a local variable. True Reborrowing does not shorten the lifetime of the result.
To avoid having to introduce new kinds of references, new kinds of lifetime annotations, or a blessed trait method, no method will be introduced at all. Instead, the `Reborrow` trait is intended to be a derived trait that effectively reborrows each field individually; `Copy` fields end up just copying, while fields that themselves `Reborrow` get disabled in the source, usually leading to the source itself being disabled (some differences may appear with structs that contain multiple reborrowable fields). The goal of the experiment is to determine how the actual implementation here will shape out, and what the "bottom case" for the recursive / deriving `Reborrow` is.
`Reborrow` has a friend trait, `CoerceShared`, which is equivalent to a `&'a mut T -> &'a T` conversion. This is needed as a different trait and different operation due to the different semantics it enforces on the source: a `CoerceShared` operation only disables the source for writes / exclusive access for the lifetime of the result. That trait is not yet introduced in this PR, though there is no particular reason why it could not be introduced.
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Fix the ABI parameter inconsistency issue in debug.rs for LoongArch64
Issue: rust-lang/rust#145692
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r=GuillaumeGomez
rustdoc-search: GUI tests check for `//` in URL
Follow up https://github.com/rust-lang/rust/pull/145650
When this fails, you get output that looks like:
/home/user/rust/tests/rustdoc-gui/search-result-impl-disambiguation.goml search-result-impl-disambiguation... FAILED
[ERROR] `tests/rustdoc-gui/utils.goml` around line 49
from `tests/rustdoc-gui/search-result-impl-disambiguation.goml` line 25: JS errors occurred: Event: Event
Making the error message more informative requires patching browser-ui-test.
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On E0277, point at type that doesn't implement bound
When encountering an unmet trait bound, point at local type that doesn't implement the trait:
```
error[E0277]: the trait bound `Bar<T>: Foo` is not satisfied
--> $DIR/issue-64855.rs:9:19
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LL | pub struct Bar<T>(<Self as Foo>::Type) where Self: ;
| ^^^^^^^^^^^^^^^^^^^ unsatisfied trait bound
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help: the trait `Foo` is not implemented for `Bar<T>`
--> $DIR/issue-64855.rs:9:1
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LL | pub struct Bar<T>(<Self as Foo>::Type) where Self: ;
| ^^^^^^^^^^^^^^^^^
```
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Add an experimental unsafe(force_target_feature) attribute.
This uses the feature gate for https://github.com/rust-lang/rust/issues/143352, but is described in https://github.com/rust-lang/rfcs/pull/3820 which is strongly tied to the experiment.
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Add codegen-llvm regression tests
Most of these regressions deal with elimination of panics and bounds checks that were fixed upstream by LLVM.
closes https://github.com/rust-lang/rust/issues/141497
closes https://github.com/rust-lang/rust/issues/131162
closes https://github.com/rust-lang/rust/issues/129583
closes https://github.com/rust-lang/rust/issues/110971
closes https://github.com/rust-lang/rust/issues/91109
closes https://github.com/rust-lang/rust/issues/80075
closes https://github.com/rust-lang/rust/issues/74917
closes https://github.com/rust-lang/rust/issues/71997
closes https://github.com/rust-lang/rust/issues/71257
closes https://github.com/rust-lang/rust/issues/59352
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r=Mark-Simulacrum
[Debuginfo] improve enum value formatting in LLDB for better readability
> TL;DR: When debugging with CodeLLDB, I noticed enum values were often hard to read because LLDB lists every possible variant, resulting in a verbose and cluttered view, even though only one variant is actually valid. Interestingly, raw enum types display nicely. After some investigation, I found that `&enum` values get classified as `Other`, so it falls back to `DefaultSyntheticProvider`, which causes this verbose output.
## What does this PR do?
This PR contains 2 commits:
1. change the enum value formatting from showing 2 separate fields (`value` for attached data and `$discr$` for the discriminator) to a concise `<readable variant name>: <attached data>` format
2. dereference pointer types in `classify_rust_type` so that it can return more accurate type for reference type
## Self-test proof
Before:
<img width="1706" height="799" alt="before" src="https://github.com/user-attachments/assets/b66c7e22-990a-4da5-9036-34e3f9f62367" />
After:
<img width="1541" height="678" alt="after" src="https://github.com/user-attachments/assets/36db32e2-f822-4883-8f17-cb8067e509f6" />
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print raw lifetime idents with r#
This replaces rust-lang/rust#143185 and fixes rust-lang/rust#143150
cc ``@fmease``
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Implementation: `#[feature(nonpoison_rwlock)]`
Tracking Issue: https://github.com/rust-lang/rust/issues/134645
This PR continues the effort made in https://github.com/rust-lang/rust/pull/144022 by adding the implementation of `nonpoison::rwlock`.
Many of the changes here are similar to the changes made to implement `nonpoison::mutex`. The only real difference is that this PR includes a reorganizing of the existing `poison::rwlock` file that hopefully makes both variants more readable.
### Related PRs
- `nonpoison_condvar` implementation: https://github.com/rust-lang/rust/pull/144651
- `nonpoison_once` implementation: https://github.com/rust-lang/rust/pull/144653
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Convert moves of references to copies in ReferencePropagation
This is a fix for https://github.com/rust-lang/rust/issues/141101.
The root cause of this miscompile is that the SsaLocals analysis that MIR transforms use is supposed to detect locals that are only written to once, in their single assignment. But that analysis is subtly wrong; it does not consider `Operand::Move` to be a write even though the meaning ascribed to `Operand::Move` (at least as a function parameter) by Miri is that the callee may have done arbitrary writes to the caller's Local that the Operand wraps (because `Move` is pass-by-pointer). So Miri conwiders `Operand::Move` to be a write but both the MIR visitor system considers it a read, and so does SsaLocals.
I have tried fixing this by changing the `PlaceContext` that is ascribed to an `Operand::Move` to a `MutatingUseContext` but that seems to have borrow checker implications, and changing SsaLocals seems to have wide-ranging regressions in MIR optimizations.
So instead of doing those, this PR adds a new kludge to ReferencePropagation, which follows the same line of thinking as the kludge in CopyProp that solves this same problem inside that pass: https://github.com/rust-lang/rust/blob/a5584a8fe16037dc01782064fa41424a6dbe9987/compiler/rustc_mir_transform/src/copy_prop.rs#L65-L98
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Recover `param: Ty = EXPR`
Fixes #137310
Pretty basic recovery here, but better than giving an unexpected token error.
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there are a lot of MCVEs there, so this is only a few of them, not all
duplicates that were opened
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This reverts commit 585a40963ea59808e74803f8610659a505b145e0.
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Signed-off-by: Jens Reidel <adrian@travitia.xyz>
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When encountering an unmet trait bound, point at local type that doesn't implement the trait:
```
error[E0277]: the trait bound `Bar<T>: Foo` is not satisfied
--> $DIR/issue-64855.rs:9:19
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LL | pub struct Bar<T>(<Self as Foo>::Type) where Self: ;
| ^^^^^^^^^^^^^^^^^^^ unsatisfied trait bound
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help: the trait `Foo` is not implemented for `Bar<T>`
--> $DIR/issue-64855.rs:9:1
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LL | pub struct Bar<T>(<Self as Foo>::Type) where Self: ;
| ^^^^^^^^^^^^^^^^^
```
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To reduce risk of regressing on generating debuginfo e.g. in the form of
ICE:s. This will also ensure that future ui tests support different
debuginfo levels.
When I looked at run time for different CI jobs, **x86_64-gnu-debug**
was far from the bottle neck, so it should be fine to make it perform
more work.
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This more closely matches the RFC and what our T-lang contact has asked
for, see https://github.com/rust-lang/rust/issues/136889#issuecomment-3212715312
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Revise the extra `r: 'static` constraints added upon universe issues
to add an explanation, and use that explanation during constraint blame
search. This greatly simplifies the region inference logic, which
now does not need to reverse-engineer the event that caused a region
to outlive 'static.
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Rewrite the new attribute argument parser
Fixes https://github.com/rust-lang/rust/issues/143940
This rewrites the parser, should improve performance and maintainability.
This can be reviewed commit by commit
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Sort mono items by symbol name
Trying to claw back cycles/branch/cache miss losses from https://github.com/rust-lang/rust/pull/144722.
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This uses the feature gate for
https://github.com/rust-lang/rust/issues/143352, but is described in
https://github.com/rust-lang/rfcs/pull/3820 which is strongly tied to
the experiment.
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Handle `ReEarlyParam` in `type_name`.
Fixes rust-lang/rust#145696.
r? `@lcnr`
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