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make &mut !Unpin not dereferenceable, and Box<!Unpin> not noalias
See https://github.com/rust-lang/unsafe-code-guidelines/issues/381 and [this LLVM discussion](https://discourse.llvm.org/t/interaction-of-noalias-and-dereferenceable/66979). The exact semantics of how `noalias` and `dereferenceable` interact are unclear, and `@comex` found a case of LLVM actually exploiting that ambiguity for optimizations. I think for now we should treat LLVM `dereferenceable` as implying a "fake read" to happen immediately at the top of the function (standing in for the spurious reads that LLVM might introduce), and that fake read is subject to all the usual `noalias` restrictions. This means we cannot put `dereferenceable` on `&mut !Unpin` references as those references can alias with other references that are being read and written inside the function (e.g. for self-referential generators), meaning the fake read introduces aliasing conflicts with those other accesses.
For `&` this is already not a problem due to https://github.com/rust-lang/rust/pull/98017 which removed the `dereferenceable` attribute for other reasons.
Regular `&mut Unpin` references are unaffected, so I hope the impact of this is going to be tiny.
The first commit does some refactoring of the `PointerKind` enum since I found the old code very confusing each time I had to touch it. It doesn't change behavior.
Fixes https://github.com/rust-lang/miri/issues/2714
EDIT: Turns out our `Box<!Unpin>` treatment was incorrect, too, so the PR also fixes that now (in codegen and Miri): we do not put `noalias` on these boxes any more.
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r=notriddle
Turn MarkdownWithToc into a struct with named fields
Extracted the commit from https://github.com/rust-lang/rust/pull/107640.
r? `@notriddle`
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Add nicer output to PGO build timer
This PR modifies the timer used in the PGO build script to contain nicer, hierarchical output of the individual build steps. It's not trivial to test locally, so I'll fire up a dist build right away.
r? ``@Mark-Simulacrum``
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rustdoc: combine duplicate rules in ayu CSS
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Adds the extended error documentation for E0523 to indicate that the
error is no longer produced by the compiler.
Update the E0464 documentation to include example code that produces the
error.
Remove the error message E0523 from the compiler and replace it with an
internal compiler error.
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See https://github.com/rust-lang/unsafe-code-guidelines/issues/381 for discussion.
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r=GuillaumeGomez
rustdoc: compute maximum Levenshtein distance based on the query
Preview: https://notriddle.com/notriddle-rustdoc-demos/search-lev-distance-2023/std/index.html?search=regex
The heuristic is pretty close to the name resolver, maxLevDistance = `Math.floor(queryLen / 3)`.
Fixes #103357
Fixes #82131
Similar to https://github.com/rust-lang/rust/pull/103710, but following the suggestion in https://github.com/rust-lang/rust/pull/103710#issuecomment-1296360267 to use `floor` instead of `ceil`, and unblocked now that https://github.com/rust-lang/rust/pull/105796 made it so that setting the max lev distance to `0` doesn't cause substring matches to be removed.
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Previously, the pre-commit hook which runs `x test tidy` could pass only to have CI fail within the first 30 seconds.
This adds about 30 seconds to `test tidy` (for an initial run, much less after the tool is built the first time)
in exchange for catching errors in `.github/workflows/ci.yml` before they're pushed.
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Previously, it would only run on changes to subtrees, submodules, or select directories.
That made it so that changes to the compiler that broke tools would only be detected on a full bors merge.
This makes it so the tools builder runs by default, making it easier to catch breaking changes to clippy (which was the most effected).
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rustdoc: change trait bound formatting
Fixes #85566
Before
<img width="268" alt="image" src="https://user-images.githubusercontent.com/29011024/208326689-cc9b4bae-529c-473c-81e2-fc5ddb738f07.png">
Now
<img width="268" alt="image" src="https://user-images.githubusercontent.com/29011024/216216918-d7923787-3e3b-486d-9735-4cecd2988dba.png">
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consolidate bootstrap docs
With this diff, I tried to consolidate bootstrap documentations and remove the duplicated informations.
Coupled with https://github.com/rust-lang/rustc-dev-guide/pull/1563
Resolves #90686
Signed-off-by: ozkanonur <work@onurozkan.dev>
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rustdoc: fix item-spacer
rustdoc: use proper comment style
rustdoc: change formatting where clauses for traits
rustdoc: remove semicolon from provided methods
update provided methods formatting
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Signed-off-by: ozkanonur <work@onurozkan.dev>
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Makes generation of `manifest.in` deterministic:
https://github.com/rust-lang/rust-installer/pull/120
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Bumps [tokio](https://github.com/tokio-rs/tokio) from 1.23.1 to 1.24.2.
- [Release notes](https://github.com/tokio-rs/tokio/releases)
- [Commits](https://github.com/tokio-rs/tokio/commits)
---
updated-dependencies:
- dependency-name: tokio
dependency-type: direct:production
...
Signed-off-by: dependabot[bot] <support@github.com>
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Replace nbsp in all rustdoc code blocks
Based on #106125 by `@dtolnay` — this PR fixes the line wrapping bug.
Fixes #106098. This makes code copyable from rustdoc rendered documentation into a Rust source file.
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Implement epoll_wait
This PR continues working on https://github.com/rust-lang/miri/issues/602.
This is an implementation for `sleep`, though admittedly not a good one. It just does busy waiting.
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Improve `TokenCursor`.
Some small improvements, for things that were bugging me.
Best reviewed one commit at a time.
r? ``@petrochenkov``
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Co-Authored-By: David Tolnay <dtolnay@gmail.com>
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Rollup of 6 pull requests
Successful merges:
- #106575 (Suggest `move` in nested closure when appropriate)
- #106805 (Suggest `{var:?}` when finding `{?:var}` in inline format strings)
- #107500 (Add tests to assert current behavior of large future sizes)
- #107598 (Fix benchmarks in library/core with black_box)
- #107602 (Parse and recover from type ascription in patterns)
- #107608 (Use triple rather than arch for fuchsia test-runner)
Failed merges:
r? `@ghost`
`@rustbot` modify labels: rollup
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Use triple rather than arch for fuchsia test-runner
This allows the user of the test-runner script to specify a full triple rather than just an architecture which helps with the transition from the two component to three component target triples for fuchsia.
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Enable Cargo's sparse protocol in CI
This enables the sparse protocol in CI in order to exercise and dogfood it. This is intended test the production server in a real-world situation.
Closes #107342
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Add `rust.lto=off` to bootstrap and set as compiler/library default
Closes #107202
The issue mentions `embed-bitcode=on`, but here https://github.com/rust-lang/rust/blob/c8e6a9e8b6251bbc8276cb78cabe1998deecbed7/src/bootstrap/compile.rs#L379-L381
it appears that this is always set for std stage 1+, so I'm unsure if changes are needed here.
`@rustbot` label +A-bootstrap
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This makes it clear they return token trees, and makes for a nice
comparison against `TokenCursor` which returns tokens.
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r=notriddle,petrochenkov
Fix handling of items inside a `doc(hidden)` block
Fixes #106373.
cc `@aDotInTheVoid`
r? `@notriddle`
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Inline CSS background images directly into the CSS
A nice advantage of this is that it removes a few entries in the list of static files.
r? ``@notriddle``
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Add Style Guide rules for let-else statements
cc `@rust-lang/style` `@rust-lang/rustfmt`
[rendered](https://github.com/calebcartwright/rust/blob/c694d07c6413ba55caa10b9f8b853df7a7792e7c/src/doc/style-guide/src/statements.md#else-blocks-let-else-statements)
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r=pietroalbini
Revert "switch to the macos-12-xl builder"
This reverts commit fcbae989ae790d5b9a0a23ceba242d0b0d4e6c5b.
This should fix the bors failures in https://rust-lang.zulipchat.com/#narrow/stream/242791-t-infra/topic/Every.20rust-lang.2Frust.20PR.20is.20failing.20bors
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This reverts commit fcbae989ae790d5b9a0a23ceba242d0b0d4e6c5b.
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