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Introduce `ByteSymbol`
It's like `Symbol` but for byte strings. The interner is now used for both `Symbol` and `ByteSymbol`. E.g. if you intern `"dog"` and `b"dog"` you'll get a `Symbol` and a `ByteSymbol` with the same index and the characters will only be stored once.
The motivation for this is to eliminate the `Arc`s in `ast::LitKind`, to make `ast::LitKind` impl `Copy`, and to avoid the need to arena-allocate `ast::LitKind` in HIR. The latter change reduces peak memory by a non-trivial amount on literal-heavy benchmarks such as `deep-vector` and `tuple-stress`.
`Encoder`, `Decoder`, `SpanEncoder`, and `SpanDecoder` all get some changes so that they can handle normal strings and byte strings.
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Rollup of 9 pull requests
Successful merges:
- rust-lang/rust#143019 (Ensure -V --verbose processes both codegen_backend and codegen-backend)
- rust-lang/rust#143140 (give Pointer::into_parts a more scary name and offer a safer alternative)
- rust-lang/rust#143175 (Make combining LLD with external LLVM config a hard error)
- rust-lang/rust#143180 (Use `tracing-forest` instead of `tracing-tree` for bootstrap tracing)
- rust-lang/rust#143223 (Improve macro stats printing)
- rust-lang/rust#143228 (Handle build scripts better in `-Zmacro-stats` output.)
- rust-lang/rust#143229 ([COMPILETEST-UNTANGLE 1/N] Move some some early config checks to the lib and move the compiletest binary)
- rust-lang/rust#143246 (Subtree update of `rust-analyzer`)
- rust-lang/rust#143248 (Update books)
r? `@ghost`
`@rustbot` modify labels: rollup
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Update books
## rust-lang/book
2 commits in 8a6d44e45b7b564eeb6bae30507e1fbac439d72d..ef1ce8f87a8b18feb1b6a9cf9a4939a79bde6795
2025-06-28 18:06:08 UTC to 2025-06-26 23:08:19 UTC
- Chapter 14 from tech review (rust-lang/book#4423)
- Chapter 13 from tech review (rust-lang/book#4421)
## rust-embedded/book
1 commits in 10fa1e084365f23f24ad0000df541923385b73b6..41f688a598a5022b749e23d37f3c524f6a0b28e1
2025-06-27 07:21:31 UTC to 2025-06-27 07:21:31 UTC
- Fix incorrect type for semihosted stdout stream rust-lang/rust#394 (rust-embedded/book#395)
## rust-lang/reference
4 commits in 50fc1628f36563958399123829c73755fa7a8421..e9fc99f107840813916f62e16b3f6d9556e1f2d8
2025-06-28 20:00:14 UTC to 2025-06-24 19:02:48 UTC
- fix: swap places for 2 words in associated-items.md sentence. (rust-lang/reference#1871)
- Add new temporary lifetime extension rule (rust-lang/reference#1813)
- Fix smart punctuation inside grammar terminals (rust-lang/reference#1869)
- Fix placement of codegen link definitions (rust-lang/reference#1868)
## rust-lang/rust-by-example
1 commits in 05c7d8bae65f23a1837430c5a19be129d414f5ec..288b4e4948add43f387cad35adc7b1c54ca6fe12
2025-06-25 12:35:59 UTC to 2025-06-25 12:35:59 UTC
- allow easy fixes (rust-lang/rust-by-example#1941)
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Subtree update of `rust-analyzer`
r? ``@ghost``
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[COMPILETEST-UNTANGLE 1/N] Move some some early config checks to the lib and move the compiletest binary
This is part of a patch series to untangle `compiletest` to hopefully nudge it towards being more maintainable.
This PR:
- Moves some early config checks (some warnings) to the compiletest library.
- Moves `src/main.rs` to `src/bin/main.rs` to make the separation (as in, compiletest's library component vs the tool binary component) more obvious.
r? ``@Kobzol`` (or reroll)
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Handle build scripts better in `-Zmacro-stats` output.
Currently all build scripts are listed as `build_script_build` in the stats header. This commit uses `CARGO_PKG_NAME` to improve that.
I tried it on Bevy, it works well, giving output like this on the build script:
```
MACRO EXPANSION STATS: serde build script
```
and this on the crate itself:
```
MACRO EXPANSION STATS: serde
```
r? `@Kobzol`
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r=petrochenkov
Improve macro stats printing
Fix a small formatting issue that has been annoying me.
r? ``@petrochenkov``
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Use `tracing-forest` instead of `tracing-tree` for bootstrap tracing
I find the `tracing-forest` output easier to comprehend.
Note that this is not a strict improvement -- `tracing-forest` output contains some emojis and redundant log levels, but customizing it seems to be... non-trivial. Despite this, I still find `tracing-forest` easier to follow than `tracing-tree`, even when I tried to tune `tracing-tree` output.
### Preview
```bash
BOOTSTRAP_TRACING=debug ./x test library/std --dry-run
```
With `tracing-forest` (this PR), it looks like
With `tracing-tree` (before this PR), it looked like
r? `@Kobzol`
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Make combining LLD with external LLVM config a hard error
Younger me made this only a warning in https://github.com/rust-lang/rust/pull/139853, because our post-dist tests were relying on this. But that was not a good idea, because there are a bunch of places in bootstrap that outright try to build LLD/copy LLD to sysroot when `lld_enabled` is true (rightfully so), which is causing issues (https://github.com/rust-lang/rust/issues/143076). Instead of piling more hacks, I'd like to just disallow this, and if we need to use a hack, do it only for our CI.
If this breaks the CI post-dist tests, I'll either add some special environment variable for it, or, as an alternative, make the error back into a warning, but also disable `lld_enabled` when this situation happens.
try-job: dist-x86_64-linux
Fixes: https://github.com/rust-lang/rust/pull/143175
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give Pointer::into_parts a more scary name and offer a safer alternative
`into_parts` is a bit too innocent of a name for a somewhat subtle operation.
r? `@oli-obk`
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Ensure -V --verbose processes both codegen_backend and codegen-backend
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r=GuillaumeGomez
GCC backend subtree update
cc `@antoyo`
r? ghost
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Sync from downstream
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Rollup of 14 pull requests
Successful merges:
- rust-lang/rust#142429 (`tests/ui`: A New Order [13/N])
- rust-lang/rust#142514 (Miri: handling of SNaN inputs in `f*::pow` operations)
- rust-lang/rust#143066 (Use let chains in the new solver)
- rust-lang/rust#143090 (Workaround for memory unsafety in third party DLLs)
- rust-lang/rust#143118 (`tests/ui`: A New Order [15/N])
- rust-lang/rust#143159 (Do not freshen `ReError`)
- rust-lang/rust#143168 (`tests/ui`: A New Order [16/N])
- rust-lang/rust#143176 (fix typos and improve clarity in documentation)
- rust-lang/rust#143187 (Add my work email to mailmap)
- rust-lang/rust#143190 (Use the `new` method for `BasicBlockData` and `Statement`)
- rust-lang/rust#143195 (`tests/ui`: A New Order [17/N])
- rust-lang/rust#143196 (Port #[link_section] to the new attribute parsing infrastructure)
- rust-lang/rust#143199 (Re-disable `tests/run-make/short-ice` on Windows MSVC again)
- rust-lang/rust#143219 (Show auto trait and blanket impls for `!`)
r? `@ghost`
`@rustbot` modify labels: rollup
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subtree-update_cg_gcc_2025-06-30
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Fixes #724
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Fix const_undef
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Stop backends from needing to support nullary intrinsics
And then remove our infrastructure special casing them. Further improvements can now be done to them by avoiding the intermediate ConstValue step, but let's leave that to follow up work
r? `@RalfJung`
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Show auto trait and blanket impls for `!`
Add an empty `impl ! {}` so rustdoc shows auto trait impls and blanket impls on `!`'s documentation page.
This is already done for [unit](https://github.com/zachs18/rust/blob/2f0ad2a71e4a4528bb80bcb24bf8fa4e50cb87c2/library/core/src/primitive_docs.rs#L493), [tuples](https://github.com/zachs18/rust/blob/2f0ad2a71e4a4528bb80bcb24bf8fa4e50cb87c2/library/core/src/primitive_docs.rs#L1148), and [`fn` pointers](https://github.com/zachs18/rust/blob/2f0ad2a71e4a4528bb80bcb24bf8fa4e50cb87c2/library/core/src/primitive_docs.rs#L1874).
cc https://github.com/rust-lang/rust/pull/97842 ``@notriddle`` which added the same for unit and tuple.
<details><summary>Comparison</summary>
[Before (current):](https://doc.rust-lang.org/nightly/std/primitive.never.html)
After:
</details>
``@rustbot`` label A-docs F-never_type
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Re-disable `tests/run-make/short-ice` on Windows MSVC again
We tried to re-enable this for MSVC in https://github.com/rust-lang/rust/pull/142844.
Unfortunately, this test still sometimes fails on Windows MSVC.
Tracked in https://github.com/rust-lang/rust/issues/143198.
FYI ```@dpaoliello``` (I couldn't reproduce this easily locally either)
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Port #[link_section] to the new attribute parsing infrastructure
Ports link_section to the new attribute parsing infrastructure for https://github.com/rust-lang/rust/issues/131229#issuecomment-2971353197
r? `@oli-obk`
cc `@JonathanBrouwer` `@jdonszelmann`
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`tests/ui`: A New Order [17/N]
> [!NOTE]
>
> Intermediate commits are intended to help review, but will be squashed prior to merge.
Some `tests/ui/` housekeeping, to trim down number of tests directly under `tests/ui/`. Part of rust-lang/rust#133895.
r? `@tgross35`
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Use the `new` method for `BasicBlockData` and `Statement`
This is the NFC part of rust-lang/rust#142771. I split it to make it easier to review for rust-lang/rust#142771. Even without rust-lang/rust#142771, I think this change is worthwhile.
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Add my work email to mailmap
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fix typos and improve clarity in documentation
```
Description:
This pull request corrects minor typos and improves wording for clarity across several documentation files, including:
- Correcting instrinsics → intrinsics
- Correcting preferrably → preferably
- Correcting Orginally → Originally
- Correcting resiliant → resilient
```
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`tests/ui`: A New Order [16/N]
> [!NOTE]
>
> Intermediate commits are intended to help review, but will be squashed prior to merge.
Some `tests/ui/` housekeeping, to trim down number of tests directly under `tests/ui/`. Part of rust-lang/rust#133895.
r? `@tgross35`
(just small one to test new method, also I should squash all this commits except move commit, so we after review will end up having like one move commit and one commit with changes, right?)
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Do not freshen `ReError`
Because `ReError` has `ErrorGuaranteed` in it, it affects candidate selection and thus causes incompleteness which leads to weirdness in eval. See the comment in the test.
Also remove an unnecessary `lookup_op_method` since it doesn't effect tests.
Fixes rust-lang/rust#132882.
r? types
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`tests/ui`: A New Order [15/N]
> [!NOTE]
>
> Intermediate commits are intended to help review, but will be squashed prior to merge.
Some `tests/ui/` housekeeping, to trim down number of tests directly under `tests/ui/`. Part of rust-lang/rust#133895.
r? `@jieyouxu`
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Workaround for memory unsafety in third party DLLs
Resolves rust-lang/rust#143078
Note that we can't make any guarantees if third parties intercept OS functions and don't implement them according to the documentation. However, I think it's practical to attempt mitigations when issues are encountered in the wild and the mitigation itself isn't too invasive.
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Use let chains in the new solver
Self-explanatory
Let chains are stable as of today
r? lcnr
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Miri: handling of SNaN inputs in `f*::pow` operations
fixes [miri/#4286](https://github.com/rust-lang/miri/issues/4286) and related to rust-lang/rust#138062 and [miri/#4208](https://github.com/rust-lang/miri/issues/4208#issue-2879058184).
For the following cases of the powf or powi operations, Miri returns either `1.0` or an arbitrary `NaN`:
- `powf(SNaN, 0.0)`
- `powf(1.0, SNaN)`
- `powi(SNaN, 0)`
Also added a macro in `miri/tests/pass/float.rs` which conveniently checks if both are indeed returned from such an operation.
Made these changes in the rust repo so I could test against stdlib, since these were impacted some time ago and were fixed in rust-lang/rust#138062. Tested with:
```fish
env MIRIFLAGS=-Zmiri-many-seeds ./x miri --no-fail-fast std core coretests -- f32 f64
```
This was successful. This does take a while, so I recommend using `--no-doc` and separate use of `f32` or `f64`
The pr is somewhat split up into 3 main commits, which implement the cases described above. The first commit also introduces the macro, and the last commit is just a global refactor of some things.
r? `@RalfJung`
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`tests/ui`: A New Order [13/N]
Some `tests/ui/` housekeeping, to trim down number of tests directly under `tests/ui/`. Part of rust-lang/rust#133895.
r? ```@jieyouxu```
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It's like `Symbol` but for byte strings. The interner is now used for
both `Symbol` and `ByteSymbol`. E.g. if you intern `"dog"` and `b"dog"`
you'll get a `Symbol` and a `ByteSymbol` with the same index and the
characters will only be stored once.
The motivation for this is to eliminate the `Arc`s in `ast::LitKind`, to
make `ast::LitKind` impl `Copy`, and to avoid the need to arena-allocate
`ast::LitKind` in HIR. The latter change reduces peak memory by a
non-trivial amount on literal-heavy benchmarks such as `deep-vector` and
`tuple-stress`.
`Encoder`, `Decoder`, `SpanEncoder`, and `SpanDecoder` all get some
changes so that they can handle normal strings and byte strings.
This change does slow down compilation of programs that use
`include_bytes!` on large files, because the contents of those files are
now interned (hashed). This makes `include_bytes!` more similar to
`include_str!`, though `include_bytes!` contents still aren't escaped,
and hashing is still much cheaper than escaping.
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deciding not to
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intrinsics
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To make it obvious `compiletest`-the-tool has two components:
1. The core compiletest library, and
2. The tool binary, which will be executed by bootstrap.
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Currently all build scripts are listed as `build_script_build` in the
stats header. This commit uses `CARGO_PKG_NAME` to improve that.
I tried it on Bevy, it works well, giving output like this on the build
script:
```
MACRO EXPANSION STATS: serde build script
```
and this on the crate itself:
```
MACRO EXPANSION STATS: serde
```
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