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Rollup of 13 pull requests
Successful merges:
- rust-lang/rust#142301 (tests: Fix duplicated-path-in-error fail with musl)
- rust-lang/rust#143630 (Drop `./x suggest`)
- rust-lang/rust#143736 (Give all bytes of TypeId provenance)
- rust-lang/rust#143752 (Don't panic if WASI_SDK_PATH not set when detecting compiler)
- rust-lang/rust#143837 (Adjust `run_make_support::symbols` helpers)
- rust-lang/rust#143878 (Port `#[pointee]` to the new attribute parsing infrastructure)
- rust-lang/rust#143905 (Recover and suggest to use `;` to construct array type)
- rust-lang/rust#143907 (core: make `str::split_at_unchecked()` inline)
- rust-lang/rust#143910 (Add experimental `backtrace-trace-only` std feature)
- rust-lang/rust#143927 (Preserve constness in trait objects up to hir ty lowering)
- rust-lang/rust#143935 (rustc_type_ir/walk: move docstring to `TypeWalker` itself)
- rust-lang/rust#143938 (Update books)
- rust-lang/rust#143941 (update `cfg_select!` documentation)
Failed merges:
- rust-lang/rust#143926 (Remove deprecated fields in bootstrap)
r? `@ghost`
`@rustbot` modify labels: rollup
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update `cfg_select!` documentation
tracking issue: https://github.com/rust-lang/rust/issues/115585
After rust-lang/rust#143461, and with an eye on a soon(ish) stabilization, I think the docs need some work.
The existing text read more like a motivation for the feature existing to me, so I've tried to now be a bit more descriptive. Still, suggestions are very welcome.
I also added a test for an empty `select! {}` because it's just the sort of thing that might break.
r? ``@traviscross``
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Update books
## rust-lang/book
3 commits in ef1ce8f87a8b18feb1b6a9cf9a4939a79bde6795..b2d1a0821e12a676b496d61891b8e3d374a8e832
2025-07-08 17:24:41 UTC to 2025-07-02 21:30:57 UTC
- Chapter 16 from tech review (rust-lang/book#4438)
- WIP ch 17 edits after tech review (rust-lang/book#4319)
- Chapter 15 from tech review (rust-lang/book#4433)
## rust-embedded/book
1 commits in 41f688a598a5022b749e23d37f3c524f6a0b28e1..fe88fbb68391a465680dd91109f0a151a1676f3e
2025-07-08 18:54:25 UTC to 2025-07-08 18:54:25 UTC
- Clarify usage of #[interrupt] attribute and recommend device crate re… (rust-embedded/book#386)
## rust-lang/nomicon
3 commits in 8b61acfaea822e9ac926190bc8f15791c33336e8..3ff384320598bbe8d8cfe5cb8f18f78a3a3e6b15
2025-07-05 07:34:22 UTC to 2025-07-05 07:13:51 UTC
- Add build script part to FFI chapter for more clear and smooth learn … (rust-lang/nomicon#440)
- Cleanups for tree example of splitting borrows (rust-lang/nomicon#443)
- Handle drop zst (rust-lang/nomicon#425)
## rust-lang/reference
17 commits in e9fc99f107840813916f62e16b3f6d9556e1f2d8..1f45bd41fa6c17b7c048ed6bfe5f168c4311206a
2025-07-11 23:15:51 UTC to 2025-07-01 16:49:33 UTC
- mention an important use for the naked attribute (rust-lang/reference#1929)
- Array expression repeat operands can be const blocks. (rust-lang/reference#1928)
- Document (tuple) struct pattern namespace behavior (rust-lang/reference#1925)
- Replace set of en dashes with set of em dashes (rust-lang/reference#1926)
- Update `should_panic` to use the attribute template (rust-lang/reference#1882)
- const-eval.const-expr.borrows: mention indirect places (rust-lang/reference#1865)
- associated-items.md: remove redundant word (rust-lang/reference#1874)
- introduction.md: replace hard-to-read example (rust-lang/reference#1873)
- typo (rust-lang/reference#1924)
- Update `ignore` to use the attribute template (rust-lang/reference#1881)
- Update `test` to use the attribute template (rust-lang/reference#1880)
- Update `cfg_attr` to use the attribute template (rust-lang/reference#1879)
- Update `cfg` to use the attribute template (rust-lang/reference#1878)
- allow constants to refer to mutable/external memory, but reject such constants as patterns (rust-lang/reference#1859)
- Remove outdated comment about non-copy unions (rust-lang/reference#1872)
- Add a template for documenting attributes (rust-lang/reference#1877)
- Switch enum grammar to use "variant" (rust-lang/reference#1876)
## rust-lang/rust-by-example
1 commits in 288b4e4948add43f387cad35adc7b1c54ca6fe12..e386be5f44af711854207c11fdd61bb576270b04
2025-07-04 23:17:15 UTC to 2025-07-04 23:17:15 UTC
- Update Chinese translations (rust-lang/rust-by-example#1943)
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rustc_type_ir/walk: move docstring to `TypeWalker` itself
having it on the impl block is a bit weird imo
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Preserve constness in trait objects up to hir ty lowering
r? ``@compiler-errors``
While we don't support `dyn const Trait`, we can at least also inform the user that `const Trait` is only legal for `#[const_trait] trait Trait {}`
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Add experimental `backtrace-trace-only` std feature
This experimentally allows building std with backtrace but without symbolisation. It does not affect stable and requires build-std to use. This doesn't change the backtrace crate itself so relies on the optimizer to remove the unused parts.
Example usage:
```toml
# .cargo/config.toml
[unstable]
build-std = ["core", "alloc", "panic_unwind", "std"]
build-std-features = ["backtrace", "backtrace-trace-only", "panic-unwind"]
```
```toml
# Cargo.toml
[profile.release]
opt-level = 3
lto = "thin"
codegen-units = 1
```
Ideally we should split the backtrace feature into `backtrace-trace` and `backtrace-symbolize` (with the latter dependent on the former) because Cargo features tend to work better when they're positive rather than negative. But I'm keen for this experiment not to break existing users.
cc ``@joshtriplett``
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r=Mark-Simulacrum
core: make `str::split_at_unchecked()` inline
This PR adds `#[inline]` to the method `str::split_at_unchecked()`. This is done for two reasons:
1. The method is tiny, e.g. on AMD-64 (<https://godbolt.org/z/ba68fdfxn>):
```asm
movq %rdi, %rax
subq %rcx, %rdx
movq %rsi, (%rdi)
addq %rcx, %rsi
movq %rcx, 8(%rdi)
movq %rsi, 16(%rdi)
movq %rdx, 24(%rdi)
retq
```
2. More importantly, inlining the method enables further automatic optimizations. E.g. if you split at index 3, then in the compiler (rustc, llvm or both) knows that this code cannot fail, and the panicking path is omitted in the generated code:
```rust
pub fn punctuation(i: &str) -> Result<(), ()> {
const THREE_CHARS: &[[u8; 3]] = &[*b"<<=", *b">>=", *b"...", *b"..="];
if let Some((head, _)) = i.split_at_checked(3)
&& THREE_CHARS.contains(&head.as_bytes().try_into().unwrap())
{
Ok(())
} else {
Err(())
}
}
```
<details>
<summary>Without PR</summary>
<https://play.rust-lang.org/?version=stable&mode=release&edition=2024&gist=0234de8158f467eebd73286f20d6e27a>
```asm
playground::punctuation:
subq $40, %rsp
movq %rsi, %rdx
movq %rdi, %rsi
movb $1, %al
cmpq $3, %rdx
ja .LBB2_2
je .LBB2_3
.LBB2_11:
addq $40, %rsp
retq
.LBB2_2:
cmpb $-64, 3(%rsi)
jl .LBB2_11
.LBB2_3:
leaq 8(%rsp), %rdi
movl $3, %ecx
callq *core::str::<impl str>::split_at_unchecked@GOTPCREL(%rip)
movq 8(%rsp), %rcx
movb $1, %al
testq %rcx, %rcx
je .LBB2_11
cmpq $3, 16(%rsp)
jne .LBB2_12
movzwl (%rcx), %edx
movzbl 2(%rcx), %ecx
shll $16, %ecx
orl %edx, %ecx
cmpl $4013115, %ecx
jg .LBB2_8
cmpl $3026478, %ecx
je .LBB2_10
cmpl $4009518, %ecx
je .LBB2_10
jmp .LBB2_11
.LBB2_8:
cmpl $4013630, %ecx
je .LBB2_10
cmpl $4013116, %ecx
jne .LBB2_11
.LBB2_10:
xorl %eax, %eax
addq $40, %rsp
retq
.LBB2_12:
leaq .Lanon.d98a7fbb86d10a97c24516e267466134.2(%rip), %rdi
leaq .Lanon.d98a7fbb86d10a97c24516e267466134.1(%rip), %rcx
leaq .Lanon.d98a7fbb86d10a97c24516e267466134.6(%rip), %r8
leaq 7(%rsp), %rdx
movl $43, %esi
callq *core::result::unwrap_failed@GOTPCREL(%rip)
```
</details>
<details>
<summary>With PR</summary>
<https://play.rust-lang.org/?version=stable&mode=release&edition=2024&gist=5d4058c79ce0f6cb1a434190427d2055>
```asm
playground::punctuation:
movb $1, %al
cmpq $3, %rsi
ja .LBB0_2
je .LBB0_3
.LBB0_9:
retq
.LBB0_2:
cmpb $-64, 3(%rdi)
jl .LBB0_9
.LBB0_3:
movzwl (%rdi), %eax
movzbl 2(%rdi), %ecx
shll $16, %ecx
orl %eax, %ecx
movb $1, %al
cmpl $4013115, %ecx
jg .LBB0_6
cmpl $3026478, %ecx
je .LBB0_8
cmpl $4009518, %ecx
je .LBB0_8
jmp .LBB0_9
.LBB0_6:
cmpl $4013630, %ecx
je .LBB0_8
cmpl $4013116, %ecx
jne .LBB0_9
.LBB0_8:
xorl %eax, %eax
retq
```
</details>
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Recover and suggest to use `;` to construct array type
Fixes rust-lang/rust#143828
r? compiler
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Port `#[pointee]` to the new attribute parsing infrastructure
Ports `#[pointee]` to the new attribute parsing infrastructure for https://github.com/rust-lang/rust/issues/131229#issuecomment-2971351163
r? ``@jdonszelmann``
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Adjust `run_make_support::symbols` helpers
Massage the `symbols` helpers to fill out {match all, match any} x {substring match, exact match}:
| | Substring match | Exact match |
|-----------|----------------------------------------|-------------------------------|
| Match any | `object_contains_any_symbol_substring` | `object_contains_any_symbol` |
| Match all | `object_contains_all_symbol_substring` | `object_contains_all_symbols` |
As I'd like to use `object_contains_all_symbols` for rust-lang/rust#143669.
As part of this:
- Rename `any_symbol_contains` to `object_contains_any_symbol_substring` for accuracy, as `any_symbol_contains` is actually "contains any matching substring".
- Remove `with_symbol_iter`.
Noticed while working on https://github.com/rust-lang/rust/pull/143669.
r? ``@ChrisDenton`` (or compiler)
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Don't panic if WASI_SDK_PATH not set when detecting compiler
The fedora packaging builds the wasm sysroot outside of the rust build system. Fedora applies a couple of patches related to wasm which I think make this possible. Not panicking seems consistent with the detection logic of other targets when they cannot find cc.
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Give all bytes of TypeId provenance
This makes all bytes of TypeId uninspectable at compile-time.
For context see https://github.com/rust-lang/rust/issues/77125#issuecomment-3057049217
r? ``@RalfJung``
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Drop `./x suggest`
This PR removes the current `./x suggest` implementation (rust-lang/rust#109933, rust-lang/rust#106249) and associated docs for several reasons:
1. Primarily, `./x suggest` is another "flow" in bootstrap that incurs extra complexity and more invariants that bootstrap has to maintain. This causes more friction when trying to investigate and fix staging problems. As far as I know, this flow has not been actively maintained in quite a while, and I'm not aware of interest in maintaining it. Bootstrap really could use less implementation complexity with a very limited maintenance bandwidth.
2. The current `./x suggest` implementation "bypasses" the usual stage defaults for the various check/build/test/etc. flows, and it's not really possible to have a stage default because `./x suggest --run` produces a *sequence* of suggestions like [`./x check`, `./x test library/std`, ..] and then tries to run all of them in sequence, based on which files are modified.
3. We've not seen a lot of interest both in using it or extending static/dynamic test suggestions. Last extensions were rust-lang/rust#117961 and rust-lang/rust#120763. I'm not convinced the extra implementation complexity is worth it. This was discussed in:
- [#t-infra/bootstrap > Dropping the current `./x suggest` flow implementation](https://rust-lang.zulipchat.com/#narrow/channel/326414-t-infra.2Fbootstrap/topic/Dropping.20the.20current.20.60.2E.2Fx.20suggest.60.20flow.20implementation/with/527456699)
- [#t-compiler > Dropping current `./x suggest` implementation](https://rust-lang.zulipchat.com/#narrow/channel/131828-t-compiler/topic/Dropping.20current.20.60.2E.2Fx.20suggest.60.20implementation/with/527528696)
Closes rust-lang/rust#109933 (the current implementation is being removed).
Closes rust-lang/rust#143569 (by removing `./x suggest` altogether).
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r=workingjubilee,fmease,jieyouxu
tests: Fix duplicated-path-in-error fail with musl
musl's dlopen returns a different error than glibc, which contains the name of the file. This would cause the test to fail, since the filename would appear twice in the output (once in the error from rustc, once in the error message from musl). Split the expected test outputs for the different libc implementations.
Fixes rust-lang/rust#128474
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Port `#[cfg]` to the new attribute parsing infrastructure
Ports `#[cfg]` to the new attribute parsing infrastructure for https://github.com/rust-lang/rust/issues/131229#issuecomment-2971353197
I've split this PR into commits for reviewability, and left some comments to clarify things
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Signed-off-by: xizheyin <xizheyin@smail.nju.edu.cn>
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core: Add `BorrowedCursor::with_unfilled_buf`
Implementation of https://github.com/rust-lang/libs-team/issues/367.
This mainly adds `BorrowedCursor::with_unfilled_buf`, with enables using the unfilled part of a cursor as a `BorrowedBuf`.
Note that unlike the ACP, `BorrowedCursor::unfilled_buf` was moved to a `From` conversion. This is more consistent with other ways of creating a `BorrowedBuf` and hides a bit this conversion that requires unsafe code to be used correctly.
Cc rust-lang/rust#78485 rust-lang/rust#117693
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Signed-off-by: Jonathan Brouwer <jonathantbrouwer@gmail.com>
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and make internal terminology consistent
Co-authored-by: Travis Cross <tc@traviscross.com>
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They are not always needed when building std, as is the case when
packaging on Fedora. Panic if building from CI, but warn otherwise.
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Clippy subtree update
r? `@Manishearth`
Cargo.lock update due to `ui_test` bump and restructure.
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This is quite a bit of implementation complexity, yet it is quite
broken, and we don't have the maintenance bandwidth to address.
Remove the current implementation if only to reduce bootstrap's
implementation complexity; the `suggest` flow comes with its own set of
hacks.
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Rollup of 8 pull requests
Successful merges:
- rust-lang/rust#141809 (Don't call WSACleanup on process exit)
- rust-lang/rust#143710 (Updates to random number generation APIs)
- rust-lang/rust#143848 (Rename `stable_mir` and `rustc_smir`)
- rust-lang/rust#143855 (Port `#[omit_gdb_pretty_printer_section]` to the new attribute parsing)
- rust-lang/rust#143868 (warn on align on fields to avoid breaking changes)
- rust-lang/rust#143870 ([COMPILETEST-UNTANGLE 6/N] Use `TestSuite` enum instead of stringly-typed test suites)
- rust-lang/rust#143901 (Region constraint nits)
- rust-lang/rust#143903 (Fix typos in documentation files)
r? `@ghost`
`@rustbot` modify labels: rollup
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musl's dlopen returns a different error than glibc, which contains the
name of the file. This would cause the test to fail, since the filename
would appear twice in the output (once in the error from rustc, once in
the error message from musl). Split the expected test outputs for the
different libc implementations.
Signed-off-by: Jens Reidel <adrian@travitia.xyz>
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having it on the impl block is a bit weird imo
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Fix typos in documentation files
## Summary
Fix minor typos in documentation files to improve readability.
## Changes
- **tests/mir-opt/pre-codegen/README.md**: Fix typo `condiguration` → `configuration`
- **tests/ui/SUMMARY.md**: Fix typo in RFC link URL (`namepsace ` → `namespace`)
## Type of Change
- [x] Documentation update
- [x] Bug fix (typo correction)
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Region constraint nits
Couple miscellaneous region constraints that have a bit to do with rust-lang/rust#143545 but stand on their own.
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[COMPILETEST-UNTANGLE 6/N] Use `TestSuite` enum instead of stringly-typed test suites
This is part of a patch series to untangle `compiletest` to hopefully nudge it towards being more maintainable.
This PR should contain no functional changes.
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warn on align on fields to avoid breaking changes
r? `@workingjubilee`
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r=jdonszelmann
Port `#[omit_gdb_pretty_printer_section]` to the new attribute parsing
Ports `#[omit_gdb_pretty_printer_section]` to the new attribute parsing infrastructure for https://github.com/rust-lang/rust/issues/131229#issuecomment-2971351163
r? ```@jdonszelmann```
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Rename `stable_mir` and `rustc_smir`
This PR only renames the two crate names.
There is no doubt that we want to rename `stable_mir` to `rustc_public`, while it hasn't been discussed yet that what the new name for `rustc_smir` should be.
This PR proposes a new name for `rustc_smir`, that is `rustc_public_shim`, since `rustc_smir` now is mostly a proxy to do calls to rustc queries and the public API of rustc that is invoked by the `rustc_public` crate.
However, I don't think that name is good enough. I hope there would be a way better name.
r? `@oli-obk`
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Updates to random number generation APIs
Updates based on discussions about random number generation.
- Add comment on `RandomSource::fill_bytes` about multiple calls, to allow
efficient implementations for random sources that generate a word at a time.
- Drop the `Random` trait in favor of `Distribution<T>`, which will let people
make calls like random(1..=6), and which allows for future expansion to
non-uniform distributions, as well as floating-point. (For now, this is only
implemented for `RangeFull`, to get the interface in place. Subsequent PRs
will implement it for other range types.)
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Don't call WSACleanup on process exit
This isn't necessary as cleanup will happen when the process exits regardless.
fixes rust-lang/rust#141799
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Rollup of 10 pull requests
Successful merges:
- rust-lang/rust#143217 (Port #[link_ordinal] to the new attribute parsing infrastructure)
- rust-lang/rust#143681 (bootstrap/miri: avoid rebuilds for test builds)
- rust-lang/rust#143724 (Tidy cleanup)
- rust-lang/rust#143733 (Change bootstrap's `tool.TOOL_NAME.features` to work on any subcommand)
- rust-lang/rust#143850 (Compiletest: Simplify {Html,Json}DocCk directive handling)
- rust-lang/rust#143875 (update issue number for `const_trait_impl`)
- rust-lang/rust#143881 (Use zero for initialized Once state)
- rust-lang/rust#143887 (Run bootstrap tests sooner in the `x test` pipeline)
- rust-lang/rust#143917 (Change "allocated object" to "allocation".)
- rust-lang/rust#143918 (Tier check cleanup)
r? `@ghost`
`@rustbot` modify labels: rollup
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